A method for data communication between a first processor and a second processor is proposed. The method comprises transmitting data packets to the second processor; upon determining that transmission of the data packets is to be stopped, stopping data transmission for a first predetermined duration; and upon expiry of the first predetermined duration, transmitting to the second processor one or more subsequent data packets.
A method, system, and computer program for detecting faults in induction motors using Electric Signal Analysis (ESA) and Fast Fourier Transform (FFT) techniques is disclosed. The method involves receiving an input signal (10) from the induction motor, transforming the input signal into the frequency domain using FFT (11) to obtain an FFT spectrum, applying an envelope detection algorithm (12-15) to the FFT spectrum to obtain an envelope representing amplitude variations of frequency components, calculating (16) the Root Mean Square (RMS) of the envelope, and analyzing the calculated RMS envelope (17) to detect at least one frequency signature representative of a fault in the induction motor. The method enhances fault detection capabilities by addressing noise sensitivity and resolution limitations of traditional FFT-based ESA techniques.
A method for detecting a fault in an electric motor, the method comprising, by a motor health monitoring function of an electric motor system comprising the electric motor and a motor drive configured for driving the electric motor, wherein the motor drive is electrically coupled to a supply network for power supply of the motor drive through power supply network signals, and is electrically coupled to the electric motor through terminals for driving the electric motor through motor supply signals: computing a network signals imbalance value that represents imbalance among the power supply network signals; obtaining a motor signals imbalance value that represents imbalance among electrical signals output by the electrical motor; detecting occurrence of an electric fault in the motor based on the network signals imbalance value and the motor imbalance value.
The invention concerns a method for detecting a broken bar of a squirrel cage of an induction motor, the method comprises:
determining (40) a signal representative of the current flowing through the at least one stator winding,
computing (44) a Fourier Transform of the determined signal,
determining (46) the fundamental frequency of the Fourier Transform of the determined signal,
computing (50) an estimated rotor slip from the electric alternating power voltage applied to the stator windings and from signals representative of the current flowing through the stator windings,
setting (52) a searching window from the estimated rotor slip and from the fundamental frequency,
searching (54), a first peak and a second peak in the searching window,
g) checking (56, 58, 62) whether the frequency and/or the amplitude of the first peak and of the second peak fulfill at least one defined condition; if the at least one condition is fulfilled, generating a signal indicative of the presence of at least one broken bar.
The present document proposes a method for calculating a confidence index for predictions made by a machine learning model that forecasts the state of a physical system containing an electrical machine. The method involves assessing model performance on a test dataset, observing system state variables, and creating a global performance map by clustering the dataset based on state similarities. Each cluster is characterized by a center vector, mean limit (ML), and conservative limit (CL), which are stored. In real-time, the state variables of the system are measured and matched to the nearest cluster in the performance map. The confidence index is then determined based on the comparison, reflecting the model's reliability relative to predefined performance limits (ML and CL) for the identified cluster.
Examples include system and method for compensating dead times in a Pulse Width Modulation control applied to a switching arm connected between two supply lines, for example a switching arm of an inverter.
H02M 1/38 - Means for preventing simultaneous conduction of switches
H02M 7/5395 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
7.
Method of determining the operating state of an electric machine for the sensorless control of the electric machine with signal injection
A method of determining the instantaneous operating state of an electric machine for its sensorless control with signal injection, comprising: injecting a HF supplementary excitation into the drive voltage of the electric machine, thereby modulating the drive current (y) of the electric machine by a modulating signal (z), measuring the drive current (y) of the electric machine, and estimating a state variable (x) of the electric machine using the measured drive current (y), wherein the estimation step includes: generating a modulation basis (s) from the excitation, multiplying (P1) the measured drive current (y) by a demodulation basis (r), which is correlated with the modulation basis (s), to obtain a first intermediate signal (ry), multiplying (P2) the transpose (sT) of the modulation basis (s) by the demodulation basis (r) to obtain a second intermediate signal (rsT), applying (F1) a set of finite-length filters to the first intermediate signal (ry), and applying (F2) the same set of finite-length filters and their moments to the second intermediate signal (rsT), to obtain a linear equation system (L), solving the linear equation system (L) to obtain the modulating signal (z), and estimating the state variable (x) based on the modulating signal (z)
Methods for supplying a power from a photovoltaic panel to an electric motor; a computer-readable storage medium, a computer program product, a processor and a control circuit including instructions allowing carrying out the methods; and a variable speed drive adapted to implement the methods.
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
G05F 1/67 - Regulating electric power to the maximum power available from a generator, e.g. from solar cell
H02J 3/12 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
9.
METHOD OF MONITORING A STARTER, STARTER, AND COMPUTER READABLE STORAGE MEDIUM
A method of monitoring a starter. The method includes: determining a duration of a first start and a current supplied to one winding of the electric motor during the initiation; computing the limit theoretical thermal state of the electric motor based on the duration of the first start, on the current supplied to one winding of the electric motor during the first start and on electric motor parameters; determining a current supplied to one winding of the electric motor; computing a current thermal state based on the current determined and on the electric motor parameters; comparing the current thermal state to the limit theoretical thermal state, if the current thermal state is greater than the limit theoretical thermal state, transmitting a warning signal representative of a risk of tripping a motor thermal fault.
A computer-implemented method for controlling a ramp-up of a voltage in a DC-link, a computer-readable storage medium, a variable speed drive, and a system including a variable speed drive configured to carry out the method.
H02M 7/162 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
H02M 1/12 - Arrangements for reducing harmonics from AC input or output
H02M 1/32 - Means for protecting converters other than by automatic disconnection
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
11.
METHOD OF DETERMINING A MAXIMUM OPERATING SPEED OF AN ELECTRIC MOTOR
A method that involves determining the maximum operating speed of an electric motor under varying torque conditions, specifically at speeds surpassing its rated speed. Initially, the motor is operated at its highest speed across different torque values, establishing a data set of real measurement points. These points illustrate the relationship between the maximum motor speed and the applied torque. A coefficient (COF), ranging from 0 to 1 and dependent on motor characteristics, is selected. Two curves are then established: the first for lower maximum speeds, represented by
A method that involves determining the maximum operating speed of an electric motor under varying torque conditions, specifically at speeds surpassing its rated speed. Initially, the motor is operated at its highest speed across different torque values, establishing a data set of real measurement points. These points illustrate the relationship between the maximum motor speed and the applied torque. A coefficient (COF), ranging from 0 to 1 and dependent on motor characteristics, is selected. Two curves are then established: the first for lower maximum speeds, represented by
Ω
r
e
f
=
COFP
n
o
m
T
m
e
a
s
,
A method that involves determining the maximum operating speed of an electric motor under varying torque conditions, specifically at speeds surpassing its rated speed. Initially, the motor is operated at its highest speed across different torque values, establishing a data set of real measurement points. These points illustrate the relationship between the maximum motor speed and the applied torque. A coefficient (COF), ranging from 0 to 1 and dependent on motor characteristics, is selected. Two curves are then established: the first for lower maximum speeds, represented by
Ω
r
e
f
=
COFP
n
o
m
T
m
e
a
s
,
and the second for torques below a defined limit torque Tlim expressed as
A method that involves determining the maximum operating speed of an electric motor under varying torque conditions, specifically at speeds surpassing its rated speed. Initially, the motor is operated at its highest speed across different torque values, establishing a data set of real measurement points. These points illustrate the relationship between the maximum motor speed and the applied torque. A coefficient (COF), ranging from 0 to 1 and dependent on motor characteristics, is selected. Two curves are then established: the first for lower maximum speeds, represented by
Ω
r
e
f
=
COFP
n
o
m
T
m
e
a
s
,
and the second for torques below a defined limit torque Tlim expressed as
Ω
r
e
f
=
COFP
n
o
m
f
(
T
m
e
a
s
)
,
A method that involves determining the maximum operating speed of an electric motor under varying torque conditions, specifically at speeds surpassing its rated speed. Initially, the motor is operated at its highest speed across different torque values, establishing a data set of real measurement points. These points illustrate the relationship between the maximum motor speed and the applied torque. A coefficient (COF), ranging from 0 to 1 and dependent on motor characteristics, is selected. Two curves are then established: the first for lower maximum speeds, represented by
Ω
r
e
f
=
COFP
n
o
m
T
m
e
a
s
,
and the second for torques below a defined limit torque Tlim expressed as
Ω
r
e
f
=
COFP
n
o
m
f
(
T
m
e
a
s
)
,
where ƒ is a polynomial function derived from the measurement points. The appropriate curve is then used to ascertain the maximum motor speed for a given torque, based on whether the torque is greater or lesser than Tlim.
b—resolving the relevant equations in equation systems according to the points obtained through the processes to calculate the transfer function parameters available among
c—applying the transfer function parameters obtained to calculate PID parameters for the system regulation
θ
F04B 17/03 - Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
F04B 49/20 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by changing the driving speed
13.
METHODS FOR CONFIGURING A MOTOR DRIVE AND APPARATUSES FOR IMPLEMENTING THE SAME
A method for driving an induction motor including a rotor and a magnetic core including a magnetic inductance component. The method includes, by a motor drive configured for interfacing with the induction motor: performing a measurement of a voltage at terminals of the motor at standstill for a voltage measurement period during initial demagnetization of the magnetic core of the motor from an initial magnetic flux of the magnetic core, wherein the voltage measurement period is shorter than a time period of complete demagnetization of the magnetic core from the initial magnetic flux, and wherein the measurement of the voltage for the voltage measurement period includes a plurality of S voltage measurement data points (vi)1≤i≤S, S being a non-zero natural integer; determining a first magnetic flux estimate component based on the plurality of S voltage measurement data points (vi)1≤i≤S; determining a second magnetic flux estimate component by performing an exponential regression algorithm on the plurality of S voltage measurement data points (vi)1≤i≤S; and determining an estimate of the initial magnetic flux based on the first magnetic flux estimate and the second magnetic flux estimate component.
A method is provided for configuring a motor drive for driving an induction motor, which includes a rotor and a magnetic core comprising a magnetic inductance component. The method includes: performing a first Direct Current, DC, current injection of a first DC current value in the motor at standstill during a first predetermined time duration for first magnetization of the magnetic core of the motor; performing, following the first DC current injection, a second DC current injection of a second DC current value in the motor at standstill during a second predetermined time duration for second magnetization of the magnetic core of the motor. The second predetermined time duration is shorter than the first predetermined time duration.
A method for configuring a motor drive for driving an induction motor. The method includes the motor comprising a rotor and a magnetic core including a magnetic inductance component: performing a plurality of N measurements of a voltage at motor terminals of the motor at standstill during demagnetization of the magnetic core of the motor; determining, based on the N voltage measurements, an estimate of the magnetic inductance component of the motor operating in a linear regime; determining, based on one of the N voltage measurements, an estimate of a time constant of the rotor of the motor operating in a linear regime; and determining an estimate of a rotor resistance of the motor based on the estimate of the magnetic inductance component of the motor and the rotor time constant.
A method for estimating the output flow rate provided by a pump in a system including the pump, an upstream pipe and a downstream pipe, by using pressure information coming from a first downstream pressure sensor placed on the downstream pipe at a first distance from the pump and a second downstream pressure sensor placed on the downstream pipe at a second distance from the pump for calculating the output flow rate.
G01F 1/36 - Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
17.
COVER BOX FOR PROTECTING AN ELECTRICAL CONNECTION, ASSEMBLY, AND RELATED METHOD
A cover box including two half-shells configured to accommodate at least part of an electrical connection, each half-shell including: a recess, opening into the interior volume; and latching means. The half-shells are able to be assembled together by cooperation of latching means of a first half-shell with the latching means of a second half-shell, the recess of the first half-shell facing the recess of the second half-shell when the half-shells are assembled together. The electrical connection includes a screw and a nut cooperating with the screw, the nut being able to be engaged in the recess of the first half-shell, a head of the screw being able to be engaged in the recess of the second half-shell.
A control process for a control system of a load system connected to an electric grid through the control system wherein the control process is configured to provide one or more adapted drive commands to the control system dependent on the grid frequency. The control system may include an inverter, a converter, a thyristor bridge or contactors and the load may be a motor. A control device for implementing the control process also is disclosed.
H02J 3/12 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
H02P 29/40 - Regulating or controlling the amount of current drawn or delivered by the motor for controlling the mechanical load
19.
METHOD FOR IDENTIFICATION OF IMPELLER WEAR AND EXCESSIVE WEAR-RING CLEARANCE IN CENTRIFUGAL PUMPS
A method for determining mechanical degradation of parts of a centrifugal pump having a fluid inlet, an impeller, and a fluid outlet. The method includes calculating at least one of a wear-ring clearance effect and an impeller wear effect. The wear-ring clearance effect is calculated using measurements of an actual pump flow rate Qp and actual pump power Pwp, calculating an internal flow rate of the pump QpPwp, calculating the mechanical power PwQp that should be used if the pump worked as specified in a theoretical curve, and calculating a difference between a theoretical Head and an internal Head Hpth−HpPwp to obtain the loss of Head due to the wear-ring clearance. The impeller wear effect is calculated by measuring an actual input pressure pin, an actual output pressure pout and an actual pump power Pwp, calculating a theoretical flow rate QpPwp corresponding to the measured mechanical power Pwp, calculating a theoretical Pump Head HpPwp, calculating the actual Pump Head Hp from the actual input pressure pin, and the actual output pressure pout and a pumped fluid density, and calculating a difference between the theoretical pump head and the actual pump Head HpPwp−Hp to obtain the loss of head due to the impeller wear.
Examples include a method for controlling a variable speed drive driving a three-phase electric motor. The method includes measuring current signals in the windings of the electric motor, and determining a current parameter associated to the electric motor based on the current signals. The current parameter includes either a current offset of at least one winding of the electric motor in relation to a zero-current value, or a current misbalance between windings of the electric motor. The method further includes determining an amended control law of the electric motor for decreasing the determined current parameter, and applying pulse width modulation signals on insulated gate bipolar transistors of the inverter based on the amended control law.
H02P 6/08 - Arrangements for controlling the speed or torque of a single motor
H02P 21/14 - Estimation or adaptation of machine parameters, e.g. flux, current or voltage
H02P 21/22 - Current control, e.g. using a current control loop
H02P 23/14 - Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
H02P 27/12 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
Examples include a method for determining a permanent magnet flux state of a rotor in a synchronous motor using a VSD. The method includes obtaining d-axis and q-axis inductance values of the motor, fixing a non-zero stator current magnitude and controlling a motor speed using a speed loop regulation in a stator current angle γ polar coordinate frame to reach a zero motor speed steady state corresponding to the fixed non-zero stator current magnitude, to the obtained d-axis and q-axis inductance values, and to a no-load situation. The method further includes recording coordinates of the reached steady state.
Examples include a method for determining a static load torque at standstill applied to a salient pole synchronous motor. The method comprises fixing a first non-zero torque-producing current component and controlling motor speed using a speed loop regulation of a first regulated component to reach a first zero motor speed steady state corresponding to the fixed first non-zero current component, the motor being subjected to the specific static load torque. The method further comprises controlling motor speed using a speed loop regulation of a second regulated component to reach a second zero motor speed steady state corresponding to a fixed second non-zero torque-producing current component, the motor being subjected to the specific static load torque, the first non-zero current component and the second non-zero current component corresponding to different values. The load torque is estimated as a function of components of the first and second zero motor speed steady states.
A harmonic filter including: a n-pulse transformer of a three-phase current, n being a multiple of 6; and n/6, or n/6-1, bridge rectifiers at the output of the n-pulse transformer.
H02M 1/12 - Arrangements for reducing harmonics from AC input or output
H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
H03H 11/04 - Frequency selective two-port networks
25.
Method for detecting a structural fault of an electric motor
A method for detecting a structural fault of an electric motor. The method includes: (i) acquiring a measurement signal of a physical parameter representative of the rotation of the electric motor, (ii) obtaining the high frequency component of the measurement signal, resulting in a corrected signal, (iii) applying a set of band-pass filters to the corrected signal resulting in a set of filtered corrected signals, (iv) determining a stator frequency and a rotor frequency, (v) computing a frequency signature vector, (vi) computing a temporal symptom vector from the frequency signature vector and the set of filtered corrected signals, and (vii) detecting a structural fault of the electric motor from the determined temporal symptom vector and from a classifier model.
H02H 7/093 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against increase beyond, or decrease below, a predetermined level of rotational speed
Examples include a method for detecting the evolution of the magnetic state of a permanent magnet rotor. The method includes, during a first and a second time interval, applying a respective direct current command signal to the motor to estimate a respective stator resistance value, and applying a respective alternative voltage command signal corresponding to a specific direct axis stator current value to the motor while measuring respective stator phase current values. The method also includes determining respective rotor flux parameters as a function of the measured respective stator phase current values and of the estimated respective stator resistance values. The method further includes comparing the respective rotor flux parameters. The first and second time intervals are separated by a time period which exceeds at least 100 times any one of a first or second interval length.
An apparatus for adapting an intelligent power module to a main circuit board of a motor controller, including: an adapter circuit board having fixed interface contact pins configured to be plugged into interface contact elements of the main circuit board of the motor controller, the power module having contact pins having a first pin out configuration connected on the adapter circuit board, wherein the adapter circuit board provides a cross pin configuration between the first pin out configuration of the power module and the interface contact pins having a second pin out configuration in order to connect the power module to the main circuit board, a set of capacitors connecting points on the adapter circuit board and capacitors connected to at least some of the capacitors connecting points and configured to reduce a radiated emission level of the motor controller, the capacitance of the capacitors being designed to reach a target threshold for the radiated emission level of the motor controller.
H02K 11/02 - Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
H01R 31/06 - Intermediate parts for linking two coupling parts, e.g. adapter
A; comparing the calculated differential angle Δθ with known differential angles corresponding to a correct cabling differential angle and faulty cablings differential angles in test process steps to determine the status of the cabling, and wherein a result of the test process steps is displayed to show the status of the cabling.
A method for monitoring operation status of an electric motor in real time, including: reading a drive application signal of the electric motor; selecting a frequency to be observed; analyzing the frequency to be observed to obtain a spectrum thereof; analyzing the spectrum; and detecting the operation status of the electric motor on the basis of the spectrum analysis.
A method of setting up an electrical motor speed control in a fluidic system including a turbomachine, an electric motor having a number p of pole pairs rotating the turbomachine, a variable speed drive controlling the speed of the electric motor, a sensor measuring a parameter H, Q of the turbomachine, and a system controller receiving the sensor's measurements and controlling the operation of the fluidic system. The method includes driving the electric motor at a predetermined electrical frequency, Fe, such that the turbomachine rotates with a controlled rotational speed N, determining the point of intersection of the system curve of the fluidic system and of the performance curve of the turbomachine to obtain the turbomachine's nominal operating point, and thus the nominal value, Hn, Qn, of the turbomachine parameter, measuring, with the sensor, the current value, H, Q of the turbomachine parameter, calculating the controlled rotational speed N by inputting, into the Affinity Laws, the determined nominal value, Hn, Qn, the measured current value, H, Q, and the known nominal rotational speed, Nn, of the turbomachine, determining the number p of pole pairs of the electric motor based on the ratio of the electrical frequency Fe and the calculated controlled rotational speed N, and adapting the setup of the variable speed drive to match the determined number p of pole pairs.
F04D 25/06 - Units comprising pumps and their driving means the pump being electrically driven
F04B 37/08 - Pumps specially adapted for elastic fluids and having pertinent characteristics not provided for in, or of interest apart from, groups for evacuating by thermal means by condensing or freezing, e.g. cryogenic pumps
Examples include a method for controlling a variable speed drive driving an electric motor. The variable speed drive is connected to an electric power source and comprises a passive DC-link and an inverter stage controlled by a first controller of the variable speed drive. The passive DC-link is connected to the inverter stage. The method comprises running the electric motor to reach a steady-state operating point, measuring a plurality of values of current or voltage of the passive DC-link, and computing, by a second controller, a frequency spectrum of the DC-link based on the plurality of values of current or voltage measured. The method further comprises detecting a specific resonance frequency by comparing amplitudes of the frequency spectrum to a predetermined pattern, and modifying filter parameters of a digital filter of the DC-link or control parameters of a control law of the electric motor based on the specific resonance frequency.
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
H02P 23/12 - Observer control, e.g. using Luenberger observers or Kalman filters
32.
Sensorless control of a motor by variable frequency signal injection
A method for sensorless control of an electric motor implemented in a variable speed drive including: determining a control voltage to be applied to the motor; injecting a high frequency signal to the control voltage to obtain an excitation voltage, wherein one or more frequencies of the high frequency signal varies with time; applying the excitation voltage to the motor; measuring a current signal induced in the motor by the excitation voltage, wherein the current signal comprises a fundamental current, induced by the control voltage, and a disturbance current, induced by the high frequency signal; and demodulating the current signal.
Examples include a method for controlling an electric motor using a variable speed drive based on input parameters of the variable speed drive. The method uses initial estimated parameters of an electric motor and measurements of the variable speed drive at operating points of the electric motor to determine accurate input parameters of the variable speed drive.
Examples include a method for controlling a motor soft-starter for starting an electric motor on a three-phases electric network in order to compensate a misbalance between the windings of the electric motor due to a misbalance between the phases of the electric network.
A variable speed drive includes an output terminal for delivering a drive voltage; a power inverter for generating the drive voltage; a drive controller for controlling the generation of the drive voltage; and a current sensor for providing a drive current intensity signal to the drive controller. The drive controller includes a PWM generator; a control law module; and a state variable estimator estimating a state variable of the controlled AC electric motor.
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
H02P 21/22 - Current control, e.g. using a current control loop
H02M 7/5395 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
Examples include a method for controlling a variable speed drive of an electric motor. The variable speed drive is connected to a torque sensor for sensing a torque supplied by the electric motor. The method includes performing, by the electric motor, a predetermined torque sequence. The method also includes measuring, by the torque sensor, a measured torque sequence corresponding to the predetermined torque sequence, and comparing the predetermined torque sequence and the measured torque sequence. As a result of the comparison, one or more torque sensor transfer function parameters are determined.
Examples include a method for controlling a synchronous motor using a variable speed drive. The motor includes a permanent magnet rotor generating a magnetic flux. The method includes applying a predefined electrical command signal to the motor and estimating a motor speed in response to the applying of the predefined electrical command signal. The method also includes reaching a desired estimated motor speed and, in response to reaching the desired estimated motor speed, estimating a parameter related to the magnetic flux of the permanent magnet rotor. The method further includes recording the estimated parameter.
Examples include a method of control implemented in a variable speed drive for controlling an electric motor during backspin, wherein the method includes: determining, by the variable speed drive, a mechanical power value occurring at a backspin speed and an estimated load torque; determining, by the variable speed drive, a specific electrical losses profile occurring at a motor flux level, wherein the specific electrical losses profile coincides with the mechanical power value; determining, by the variable speed drive, a flux reference and a speed reference to be applied to the motor to coincide with the specific electrical losses profile; and controlling, by the variable speed drive, the backspin speed of the motor to maintain the coincidence with the specific electrical losses profile.
H02P 23/14 - Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
40.
Methods, systems and devices for determining a resonance frequency of a mechanical system
A method for determining a resonance frequency of a mechanical system including an electric motor coupled to a mechanical load. The method includes starting the motor by providing a supply voltage using a motor controller, and once the electric motor is running at a predefined target rotational speed, applying a first excitation signal comprising a voltage pulse superimposed to the supply voltage. The method further includes measuring a mechanical response of the mechanical system, using a measurement system coupled to the motor, and analyzing the measured response, to determine at least one resonance frequency of the mechanical system.
B06B 1/02 - Processes or apparatus for generating mechanical vibrations of infrasonic, sonic or ultrasonic frequency making use of electrical energy
41.
Electronic device and method for determining at least one characteristic parameter of an electric machine connected to an electric starter, related power supply chain and computer program
An electronic determination device is configured for determining at least one characteristic parameter of an electric machine with P phases, P≥3, connected to an electric starter and including at least P-1 switching arms, each switching arm being connected to a respective phase of the electric machine. The determination device comprises a control module configured to control respective switching arm(s) to close and the other switching arm(s) to open, so as to generate a current injection on two phases of the electric machine; an acquisition module configured to acquire measurements of respective current(s) and voltage(s) for said two phases, further to the generation of the current injection; and a calculation module configured to calculate at least one characteristic parameter of the electric machine according to the respective current(s) and voltage(s) measurements.
G01R 27/08 - Measuring resistance by measuring both voltage and current
H02P 23/14 - Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
G01R 27/26 - Measuring inductance or capacitanceMeasuring quality factor, e.g. by using the resonance methodMeasuring loss factorMeasuring dielectric constants
H02P 1/16 - Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
42.
Electronic device and method for determining at least one characteristic parameter of a connection set connected between a converter and an electric machine, related power supply chain and computer program
a calculation module configured to calculate at least one characteristic parameter of the connection set according to the respective current(s) and voltage(s) measurements.
G01R 31/68 - Testing of releasable connections, e.g. of terminals mounted on a printed circuit board
G01R 27/00 - Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
H02M 7/523 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with LC-resonance circuit in the main circuit
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
43.
Method for estimating mechanical parameters of an electrical motor
A method for controlling an electrical motor taking in account slip frequency. The method including determining amplitude, phase and frequency of the stator voltage from voltage measurements, determining estimates for current components from current measurement and stator voltage phase, determining estimate for torque from voltage amplitude, frequency, current amplitude and motor data, determining estimate for speed from torque, frequency and motor data, and determining over-estimation of speed from speed estimate, torque estimate and slip frequency. The over-estimation may be used to improve functional safety of the motor.
A variable speed drive comprises an output for delivering a drive voltage to an electric motor, power inverter, a drive controller, and a current sensor. The drive controller includes a PWM generator, a control law module, and a state variable estimator for estimating a state variable of the electric motor. The module computes a target voltage signal based on state variable estimates provided by the estimator and outputs the target voltage signal to the PWM generator. The generator approximates the target voltage signal with a PWM control signal, controls the inverter using the control signal, computes, based on the deviation between the control signal and the target voltage signal, an estimation support signal, and outputs the estimation support signal to the estimator. The estimator estimates a state variable of the motor based on the estimation support signal and the drive current, and outputs the estimate to the module.
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
H02P 23/14 - Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
45.
Control of a power part of a variable speed drive based on predetermined levels of flux
A method for controlling a variable speed drive arranged for powering an electric motor, the variable speed drive comprising a power part and a control part. The method comprises a preliminary phase of storing a set of predetermined levels of flux of the electric motor. Then, during a current phase, the method comprises selecting a level of flux from among the set of predetermined levels of flux and controlling the power part of the variable speed drive based on the selected level of flux as reference value.
A method and device estimate an amplitude of a periodic component in a measured analog signal, e.g. from an electric motor, and adapt a control law for an external entity, e.g., a variable speed drive (VSD) controlling the motor, based on the estimated amplitude. The measured analog signal is converted by delta-sigma modulation to a digital signal that is applied to at least one filter. Periodic signals of independent known periodic functions are also applied to the at least one filter. In response, the at least one filter provides the estimated amplitude of the periodic component in the measured analog signal that may be used to adapt the control law. A monitoring value for the electric motor may also be based on the estimated amplitude of the periodic component.
A method for configuring a variable speed drive in charge of power supply of an electric motor. The method comprises the application of a sequence of motor voltages to the electric motor by the variable speed drive and the obtaining, in parallel, of measurements of motor current. The method then determines a feature of the electric motor on the basis of the measurements of motor current and determines a type of electric motor at least as a function of the feature. The variable speed drive is then set up on the basis of the determined type of electric motor.
H02P 6/00 - Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor positionElectronic commutators therefor
H02P 6/08 - Arrangements for controlling the speed or torque of a single motor
H02P 23/14 - Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
H02P 27/02 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using supply voltage with constant frequency and variable amplitude
48.
Adapting the deceleration of a motor as a function of an average rectified voltage
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
49.
Control of power cells of a variable speed drive on the basis of rectified voltages
A method for controlling a variable speed drive comprising Ni low-voltage power cells connected in series for each phase among multiple phases, i being a phase index. The method comprises repeating P iterations comprising: activating at least one cell of one or more phases and deactivating the other power cells of the variable speed drive, wherein the at least one activated cell is selected on the basis of predefined activation controls depending on an iteration index; and receiving at least one output voltage of the variable speed drive across the terminals of the electrical device for at least one phase. The method further comprises, at the end of the P iterations, determining, from the measured output voltages, values of rectified voltage at the output of respective rectification stages of the power cells, and storing the rectified voltages obtained, which are respectively associated with the power cells.
H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
50.
Management of the number of active power cells of a variable speed drive
activating the Mi power cells from among the Ni power cells, and deactivating the Ni-Mi other power cells in order to supply power to the motor in accordance with the speed command.
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
51.
Method of controlling a converter connected to an electric machine
determining the width of each pulse of the sequence made suitable for minimizing the overvoltage level across the terminals of the electric machine (M).
H02M 7/515 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
H02K 11/26 - Devices for sensing voltage, or actuated thereby, e.g. overvoltage protection devices
A method for controlling an electric motor, implemented in a variable speed drive, the variable speed drive being connected to the electric motor through a transformer, the method including; executing an identification sequence of the transformer for determining gain data corresponding to an inverse function of a transfer function of the transformer; generating a transfer module based on said determined gain data; determining a start-up sequence of the electric motor to be implemented by the variable speed drive by executing the transfer module on a reference current path.
A control method for verifying the compatibility between an input filter and a variable speed drive. The method includes applying a plurality of successive commands so as to define a plurality of operating points of the electric motor, for each operating point, measuring the DC voltage of the bus, comparing the maximum variation in the amplitude of the DC voltage measured for the operating point with a threshold value, defining a new operating point as long as the maximum variation in the amplitude of the DC voltage is lower than the threshold value, determining an operating range including all of the operating points for which the maximum variation in the amplitude of the DC voltage is lower than the threshold value.
H02P 1/28 - Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by progressive increase of voltage applied to primary circuit of motor
H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
H02P 29/032 - Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
54.
Method for identifying magnetic saturation parameters of an asynchronous electric motor
A method identifies magnetic saturation parameters of an asynchronous electric motor. The method consists in a monitoring and identification sequence including one or several iterations. The method includes applying at the input of the control law of a reference voltage or a reference flux trajectory or a reference range in order to obtain a magnetization current, building a real profile of magnetic saturation including estimate magnetization flux and measures magnetization current, and determining magnetic saturation parameters corresponding to the real profile already obtained.
H02P 1/24 - Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual AC commutator motor
H02P 1/42 - Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual single-phase induction motor
H02P 3/18 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor
H02P 21/14 - Estimation or adaptation of machine parameters, e.g. flux, current or voltage
A method and a system for controlling a multipump system used to pump a fluid. The system includes n pumping cells (Ci) connected in parallel, with n greater than or equal to 2. The system is controlled by using a reference pressure difference. The method includes estimating a pressure difference (dPpumpi) generated by each pumping cell (Ci) taking into account of a quadratic correction value (HEGi) representing the head losses of the pumping cell, estimating a pressure difference (dPSys) of the multipump system from the pressure difference estimated for each pumping cell, comparing the multipump estimated pressure difference (dPSys) with the reference pressure difference (dPsp) in order to control the reference speed (Wref) to be injected into a control loop of the multipump system.
A modular multi-level power converter device including an AC output, including a modular multi-level DC/AC converter including a plurality of arms in parallel, ends of which define input terminals, each arm including two lines of modules in series, each switching module including a pair of switches in series, mounted on terminals of an energy-storage device, the DC/AC converter adjusting frequency at an output of the converter device. The device further includes a converter including a DC output, including two output terminals connected to the input terminals of the DC/AC converter, the converter including a DC output adjusting amplitude at an output of the converter device, the DC/AC converter further including a mechanism controlling the switches of the modules, which apply a full-wave command to the switches during at least one time interval, the modules of a single line being in a same state simultaneously.
H02P 27/00 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
H02M 7/483 - Converters with outputs that each can have more than two voltage levels
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
58.
Method and system for controlling an electric motor control installation
A control method implemented for an electric motor control installation, the control installation including a first converter having controlled switching arms for applying first voltage edges to a first electric motor connected to the first converter by first output phases, a second converter having controlled switching arms for applying second voltage edges to a second electric motor connected to the second converter by second outlet phases, the control method including a step of synchronizing first voltage edges with second voltage edges in order to minimize the common-mode currents generated by the installation.
H02M 1/44 - Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
H02M 7/06 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
H02M 7/23 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in parallel
H02P 5/74 - Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more AC dynamo-electric motors
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
H02M 1/12 - Arrangements for reducing harmonics from AC input or output
59.
Method for controlling an asynchronous electrical motor
A method for controlling an asynchronous electrical motor, implemented in a processing unit associated with a power converter connected to the electrical motor, the method including an identification phase, which includes generating a speed trajectory in input of a control law of the motor in order to make the speed reference take several determined successive values, for each value taken by the speed reference, determining the voltage at the terminals of the electrical motor, for each value taken by the speed reference, determining and storing the flux value for which the voltage at the terminals of the electrical motor is equal to a determined threshold value.
H02P 21/00 - Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
H02P 21/14 - Estimation or adaptation of machine parameters, e.g. flux, current or voltage
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
60.
Method and system for controlling a control installation of an electric motor
A control method which is deployed in a control installation of an electric motor, the control installation including a first converter controlled for the application of the first voltage pulse edges to an electric motor of a first pulse width modulation, obtained by comparing a first carrier signal, applied at a first chopping frequency, with a first modulating signal, a second converter controlled of a second pulse width modulation, obtained by comparing a second carrier signal, applied at a second chopping frequency, with a second modulating signal. The control method involves the determination of a notional optimum phase-shift angle on the basis of the first chopping frequency and the second chopping frequency.
H02P 5/74 - Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more AC dynamo-electric motors
H02M 7/23 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in parallel
H02M 7/46 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 1/12 - Arrangements for reducing harmonics from AC input or output
61.
Control method for starting a synchronous electric motor
A control method implemented in a variable speed drive for starting a synchronous electric motor, said method including the application, as input, of a reference speed according to a predefined speed profile, the determination of a reference position based on the reference speed that is applied as input, the determination of a voltage in a rotating frame of reference, based on the reference speed that is applied as input, the determination of control voltages to be applied to each output phase depending, on the one hand, on the determined reference position and, on the other hand, on said voltage determined in the rotating frame of reference, and the application of the control voltages to each output phase to obtain an alignment of the position of the rotor of said motor with the reference position.
H02P 21/06 - Rotor flux based control involving the use of rotor position or rotor speed sensors
H02P 1/52 - Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor by progressive increase of frequency of supply to motor
H02P 1/46 - Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor
The invention relates to a modular multi-level power converter device having an AC output, comprising a modular multi-level DC/AC converter (21) having a plurality of arms (1.1, 1.2, 1.3) in parallel, the ends of which define input terminals (27, 28), each arm comprising two lines of modules (4.11, 4.12, 4.13, 4.14, 4.15, 4.16) in series, each switching module having a pair of switches in series (T111, T211), mounted on the terminals of an energy-storage device (4.3), the DC/AC converter adjusting the frequency at the output of the converter device. The device also comprises a converter having a DC output (20), comprising two output terminals (A, 22, 91, 92) connected to the input terminals (27, 28) of the DC/AC converter (21), said converter having a DC output (20) adjusting the amplitude at the output of the converter device, the DC/AC converter (21) also comprising means (29) for controlling the switches (T111, T211) of the modules, which apply a full-wave command to the switches during at least one time interval, the modules of a single line being in the same state simultaneously.
H02M 7/483 - Converters with outputs that each can have more than two voltage levels
64.
Method and system for displaying at least one matrix code on a screen to send data to electronic equipment provided with means for reading the matrix code(s)
A display method displays at least one matrix code on a screen of an electronic display device, to send data to electronic equipment including a mechanism reading the matrix code. The display device includes the screen and a mechanism displaying information on the screen. The display method includes: generating at least one two-dimensional matrix code from data to be sent; displaying the matrix code on the screen, matrix codes being displayed successively when plural matrix codes are generated; partitioning a primary image corresponding to a generated matrix code into at least two secondary images, dimensions of the primary image being equal to dimensions of the matrix code and dimensions of the secondary image being smaller than or equal to resolution of the screen, the corresponding matrix code being displayed as secondary images during the display, and the secondary images being displayed successively on the screen.
G06K 19/06 - Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
G06T 11/60 - Editing figures and textCombining figures or text
G06K 7/14 - Methods or arrangements for sensing record carriers by electromagnetic radiation, e.g. optical sensingMethods or arrangements for sensing record carriers by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
65.
Heat-dissipating structure for VSD, and control method and device
A heat-dissipating structure for a variable speed drive (VSD), a VSD device having the heat-dissipating structure, and a method for controlling the heat-dissipating structure. The heat-dissipating structure comprises: an electronic element array, having a first end and an opposite second end, electronic elements in the array producing heat during operation; a heat-dissipating fan, disposed at the first end of the array and used to conduct cooling air to flow between the first end and the second end to cool the electronic elements in the array; and a control apparatus, for controlling operation of the fan, the control apparatus controlling the fan so that the fan rotates at a first rotation direction within a first time period to conduct the cooling air to flow from the second end to the first end, and rotates at a second rotation direction contrary to the first rotation direction within a second time period to conduct the cooling air to flow from the first end to the second end.
The present invention relates to a control system for an electric charge, said system comprising: —A first power converter (VV1) and a second power converter (VV2) connected in parallel, —A first control unit (UC1) associated with the first power converter and a second control unit (UC2) associated with the second power converter, —The second control unit (UC2) comprises a main control module (M1_2) for determining a second output voltage (vσ2) to apply the electric charge and a secondary control module (M2_2) to determine a control voltage (Δvσk) to be applied to said second output voltage (vσ2), said control voltage being determined from the difference between the output current (iσ2) of the second power converter and the output current (iσ1) of the first power converter.
H02M 5/45 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
H02M 7/537 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
H02M 7/493 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
H02M 7/48 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
A control method used in a control unit of a power converter, connected by three output phases to a synchronous electric motor, the method being used for starting the motor and including a first step for determining the voltages to be applied to the output phases depending on a reference current, a second step for determining a frequency to be applied to the stator depending on a stator frequency, a step for application of the first step and the second step for a given duration, so as to allow the rotor of the synchronous electric motor to rotate at the stator frequency applied. The method is particularly effective for an architecture including a transformer and a sinus filter between the power converter and the electric motor.
l) and a capacitive divider bridge (C9, C10, C11), the basic switching cells being connected between the voltage divider bridge and the cell of floating capacitor type.
H02M 7/537 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
H02P 27/14 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation with three or more levels of voltage
H02M 7/483 - Converters with outputs that each can have more than two voltage levels
A multi-level power converter comprising: n input stages (Ein_n), n being at least equal to 1, each input stage comprising n+1 identical input converters (CONVx_En) connected together, the input converters (CONVx_En) exhibiting an identical topology, chosen from among the architectures of the NPC (Neutral Point Clamped), ANPC (Active Neutral Point Clamped), NPP (Neutral Point Piloted) and SMC (Stacked Multicell Converter); an output stage (Eout) connected to the input stage of rank 1 and comprising an output converter (CONVs) supplied with a differential voltage (Vfloat) resulting from a first electrical potential applied to the output of a first input converter of the input stage of rank 1 and from a second electrical potential applied to the output of a second input converter of the input stage of rank 1, the output converter (CONVs) exhibiting a topology chosen from among an architecture with floating capacitor (FC), SMC (Stacked Multicell Converter), NPC (Neutral Point Clamped), NPP (Neutral Point Piloted) and ANPC (Active Neutral Point Clamped).
This is a multi-level converter comprising one or more arms (B) to each be connected between a voltage source (VDC) and a current source (I). Each arm comprises two stages (E1, E2) in cascade, the first to be connected to the voltage source (VDC), the second to be connected to the current source (I). The first stage (Et1) comprises several elementary stages (E1n, . . . , E12, E11) of rank one to n in cascade, the elementary stage (E11) of rank one being connected to the second stage (Et2) and the elementary stage (E1n) of rank n having to be connected to the voltage source (VDC). Each elementary stage (E1n) comprises a pair of identical cells of NPC type (Cen1, Cen2) in series, the connection being direct in the elementary stage of rank 1, the connection being made via n−1 capacitive cells ((Can(1), . . . , Can(n−1)) for each elementary stage of rank greater than one, the second stage (Et2) comprising a floating capacitor cell (Ce10).
H02M 5/42 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
The object of the present application is to ensure the security of a device when a precharging relay is not closed and a load current passes through a precharging resistor, so as to ensure the customer's security. Provided is a security control method for a system with a precharging circuit, comprising: giving out an error alarm and stopping operating the system when the number of times of undervoltage of a precharging circuit achieves m times and the duration between the first undervoltage and the mth undervoltage is less than or equal to τ seconds, where m and τ are positive integers. Compared with the previous method, the present invention has the following advantages of no danger of combustion and high reliability; and cost saving and no need of adding additional hardware.
H02H 3/247 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to undervoltage or no-voltage having timing means
76.
HEAT-DISSIPATING STRUCTURE FOR VSD, AND CONTROL METHOD AND DEVICE
A heat-dissipating structure for a variable speed drive (VSD), a VSD device having the heat-dissipating structure, and a method for controlling the heat-dissipating structure. The heat-dissipating structure comprises: an electronic element array, having a first end and an opposite second end, electronic elements in the array producing heat during operation; a heat-dissipating fan, disposed at the first end of the array and used to conduct cooling air to flow between the first end and the second end to cool the electronic elements in the array; and a control apparatus, for controlling operation of the fan, the control apparatus controlling the fan so that the fan rotates at a first rotation direction within a first time period to conduct the cooling air to flow from the second end to the first end, and rotates at a second rotation direction contrary to the first rotation direction within a second time period to conduct the cooling air to flow from the first end to the second end.
A control system included in a speed selector connected by output phases to a synchronous electric motor, the synchronous electric motor being controlled according to a control law implemented by the speed selector. A first speed of the synchronous electric motor is determined by a first speed estimator. A second speed estimator is used to determine a second speed of the synchronous electric motor. The system includes a signal generator module configured to apply, to the output phases, voltages taking account of a non-constant current signal. The second speed estimator is configured to recover the current response on the output phases, to deduce therefrom the second speed of the synchronous electric motor.
H02P 1/46 - Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor
H02P 6/08 - Arrangements for controlling the speed or torque of a single motor
The present invention relates to a control system for an electric charge, said system comprising: - A first power converter (VV1) and a second power converter (VV2) connected in parallel, - A first control unit (UC1) associated with the first power converter and a second control unit (UC2) associated with the second power converter, - The second control unit (UC2) comprises a main control module (M1_2) for determining a second output voltage (νσ2) to apply the electric charge and a secondary control module (M2_2) to determine a control voltage (Δvσk) to be applied to said second output voltage (νσ2), said control voltage being determined from the difference between the output current (iσ2) of the second power converter and the output current (iσ1) of the first power converter.
H02M 7/493 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
H02M 7/48 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
79.
Control method implemented in a variable speed drive
the first control signal (Ce), the second control signal (Cs), the first instant of switching and the second instant of switching being determined so as to minimize the difference between the first voltage (Vrec) and the second voltage (Vinv).
H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 1/12 - Arrangements for reducing harmonics from AC input or output
80.
METHOD AND SYSTEM FOR DISPLAYING AT LEAST ONE MATRIX CODE ON A SCREEN TO SEND DATA TO ELECTRONIC EQUIPMENT PROVIDED WITH MEANS FOR READING THE MATRIX CODE(S)
The display method according to the invention displays at least one matrix code on a screen of an electronic display device, to send data to electronic equipment provided with means for reading the matrix code(s) The display device comprises the screen and means for displaying information on the screen. The display method comprises generating (140; 240) at least one two-dimensional matrix code from data to be sent, and displaying (170, 290) the matrix code(s) on the screen, the matrix codes being displayed successively when several matrix codes are generated. The display method further comprises partitioning (160; 260) a primary image corresponding to a generated matrix code into at least two secondary images, the dimensions of the primary image being equal to the dimensions of said matrix code and the dimensions of said secondary image being smaller than or equal to the resolution of the screen of the display device, the corresponding matrix code(s) being displayed in the form of secondary images during the display step (170; 290), and the secondary images being displayed successively on the screen.
G06T 11/60 - Editing figures and textCombining figures or text
G06K 19/06 - Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
H01F 37/00 - Fixed inductances not covered by group
H02M 7/537 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
H02M 5/45 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
The invention relates to a control device (1) employed in a switched electrical power supply system to control a DC/DC converter of said switched electrical power supply system, said control device comprising a first input terminal (A) and a second input terminal (B), a first transistor (T1) connected via its source to the second input terminal (B) and a second transistor (T2) furnished with a gate (G) and connected via its drain (D) to the first input terminal (A), and via its source (S) to the first transistor (T1), the control device comprising a control assembly connected to the gate (G) of the second transistor (T2) and to the second input terminal (B) and comprising a capacitor (Ca) and a first Zener diode (Dz1) connected in series to said capacitor (Ca) and a second Zener diode (Dz2) connected between the gate (G) and the source (S) of the second transistor (T2).
H02M 5/45 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
H02M 3/156 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
H03K 17/10 - Modifications for increasing the maximum permissible switched voltage
H03K 17/74 - Electronic switching or gating, i.e. not by contact-making and -breaking characterised by the use of specified components by the use, as active elements, of diodes
H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
83.
Control method and system for correcting the voltages to be applied to an electrical load
A control method to be implemented in a power converter, the power converter including an inverter module controlled by a control rule that makes it possible to determine a control voltage to be applied to an electrical load on the basis of a reference control voltage. The control method includes determining a correction value to be applied to the reference control voltage, the correction value being determined from a first filtered voltage obtained by filtering a voltage that is representative of the real measured voltage, and a second filtered voltage obtained by filtering a voltage that is representative of the reference control voltage.
H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
The invention relates to a multi-level power converter comprising: - n input stages (Ein_n), n being at least equal to 1, each input stage comprising n + 1 identical input converters (CONVx_En) connected together, the input converters (CONVx_En) exhibiting an identical topology, chosen from among the architectures of the NPC (Neutral point Clamped), ANPC (Active Neutral Point Clamped), NPP (Neutral Point Piloted) and SMC (Stacked Multicell Converter), - an output stage (Eout) connected to the input stage of rank 1 and comprising an output converter (CONVs) supplied with a differential voltage (Vfloat) resulting from a first electrical potential applied to the output of a first input converter of the input stage of rank 1 and from a second electrical potential applied to the output of a second input converter of the input stage of rank 1, the output converter (CONVs) exhibiting a topology chosen from among an architecture with floating capacitor (FC), SMC (Stacked Multicell Converter), NPC (Neutral Point Clamped), NPP (Neutral Point Piloted) and ANPC (Active Neutral Point Clamped).
A power converter configured to control an electrical load including a supply DC bus, a bus capacitor, a pre-charging circuit of the bus capacitor provided with a limiting resistor, a switched-mode power supply, and a starter assembly of the switched-mode power supply. The power converter includes a selection mechanism configured to connect the supply DC bus either, in a first state, to the starter assembly of the switched-mode power supply or, in a second state, to the bus capacitor to short circuit the limiting resistor.
H02M 1/36 - Means for starting or stopping converters
H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
G01F 1/34 - Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
87.
Variable speed drive and system including an architecture for reinforcing the ingress protection of the variable speed drive
The invention relates to a variable speed drive (1) intended to control an electrical load, said variable speed drive (1) being constructed to be inserted along a main axis (X) through an opening (200) produced in a frame (2). The variable speed drive has the particular feature of comprising an undercut (40) produced on its rear part and having a sufficient depth to allow its fixing plinth (111) to pass through said opening (200). The invention also relates to a system comprising the variable speed drive and a seal-tight architecture. The seal-tight architecture comprises said frame through which the opening (200) intended to accommodate the variable speed drive (1) is produced.
The object of the present invention is to ensure the security of a device when a precharging relay is not closed and a load current passes through a precharging resistor, so as to ensure the customer's security. Provided is a security control method for a system with a precharging circuit, comprising: giving out an error alarm and stopping operating the system when the number of times of undervoltage of a precharging circuit achieves m times and the duration between the first undervoltage and the mth undervoltage is less than or equal to τ seconds, where m and τ are positive integers. Compared with the previous method, the present invention has the following advantages of no danger of combustion and high reliability; and cost saving and no need of adding additional hardware.
H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the networkCircuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
89.
Power management system comprising a power source, a source of renewable energy, and a power converter
The invention relates to a power management system, comprising: a power source; a source of renewable energy; a power converter; a first selection means arranged to connect the input of the power converter either to the power source or to the source of renewable energy; a second selection means arranged to connect the outlet of the power converter either to the power source or to a system for storing power; and a means for synchronizing the first selection means and the second selection means, which operates according to pre-established operation rules.
H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
H02M 1/10 - Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from AC or DC
H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
H02J 4/00 - Circuit arrangements for mains or distribution networks not specified as ac or dc
B60L 11/18 - using power supplied from primary cells, secondary cells, or fuel cells
H02J 7/35 - Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
H02J 7/02 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
90.
MOUNTING DEVICE FOR AN APPARATUS HAVING HEAT DISSIPATION REQUIREMENT
A mounting device for an apparatus having a heat dissipation requirement; the apparatus is housed in a cabinet, and comprises a heat dissipation part; the mounting device comprises a box body (1) housed in the cabinet (4); the box body (1) comprises a peripheral wall (11) on the sides, and a first mounting surface and a second mounting surface respectively located at the ends of the peripheral wall (11) on the sides; the first mounting surface and the second mounting surface are oppositely disposed and form an opening in the rear wall of the cabinet; the first mounting surface is mounted around the opening inside the cabinet, and is provided with an opening corresponding to the opening thereon; the apparatus is mounted on the second mounting surface; the heat dissipation part pushes through the second mounting surface, and extends into the box body (1) but does not go beyond the first mounting surface. The apparatus is completely housed in the cabinet, and no heat dissipation part extends outside the cabinet, thus the cabinet can be properly placed against the wall.
A motion and control system, comprising: a current rectifier (220) for transforming an alternating current into a direct current; a smoothing circuit (230) for performing smoothing processing on the wave form of the direct current output by the current rectifier (220); a main power stage (241) and a standby power stage (242) which are connected between the smoothing circuit (230) and an electric motor in parallel; and a controller (210) which, under a normal working mode, drives the main power stage (241) to transform a direct current voltage from the smoothing circuit (230) into an alternating current voltage provided for the electric motor, and when it is determined that a fault of the main power stage (241) has occurred, drives the standby power stage (242) to transform the direct current voltage from the smoothing circuit (230) into the alternating current voltage provided for the electric motor. By comprising a standby power stage (242) in a motion and control device, the cost and size of the system are reduced.
H02P 4/00 - Arrangements specially adapted for regulating or controlling the speed or torque of electric motors that can be connected to two or more different electric power supplies
92.
Control method implemented in a power converter and intended for identifying parameters linked to the magnetic saturation of an electric motor
A control method implemented in a power converter including an inverter connected to a synchronous electric motor including permanent magnets, the electric motor being modeled in the power converter by a mathematical model of currents in the electric motor expressing a flux current and a torque current on the basis of magnetic-saturation parameters. The control method identifies magnetic-saturation parameters during a learning procedure including applying a static voltage signal and a high-frequency voltage signal along an axis of the flux and/or an axis of the torque of the motor to cause an oscillation of the current on the axis of the flux and/or on the axis of the torque.
The invention relates to a control system included in a speed selector connected by output phases (1, 2, 3) to a synchronous electric motor (M), said synchronous electric motor (M) being controlled according to a control law (LC) implemented by the speed selector. A first speed (W1s) of the synchronous electric motor is determined by a first speed estimator (E1). A second speed estimator (E2) is used to determine a second speed (W2s) of the synchronous electric motor (M). The system comprises a signal generator module (MS) arranged to apply, to the output phases (1, 2, 3), voltages taking account of a non-constant current signal (ldest). The second speed estimator is arranged to recover the current response (11, 12, 13) on the output phases, in order to deduce therefrom the second speed (W2s) of the synchronous electric motor.
An electrical apparatus, comprising a circuit board, and a capacitor installed on the circuit board; the capacitor is detachably installed on the circuit board. The capacitor can be conveniently detached from the circuit board; therefore, a damaged capacitor can be easily replaced with a new capacitor, saving cost by avoiding the problem in the prior art that the entire electrical apparatus is discarded or causes downtime for repairs due to a damaged capacitor.
The invention relates to a method for estimating the value of a braking resistor (Rf) used in a power converter connected to an electric motor (M). The power converter comprises a braking cell (CelF) connected to the first power supply line (L1) and to the second power supply line (L2) of the bus of the converter, and comprises a switching member (Sw), a diode (D) connected in series to the switching member, and the braking resistor (Rf) connected in parallel to said diode. Said method is implemented during the braking of the electric motor (M), and involves: determining the capacity value (C) of the bus capacitor when the switching member is in an open state; and determining the value (R) of the braking resistor (Rf) from the capacity value (C) of the bus capacitor, the voltage (Vbus) of the continuous power supply bus, and the current (Im) generated by the electric motor during braking when the switching member is in a closed state.
H02P 3/22 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor by short-circuit or resistive braking
H02M 1/36 - Means for starting or stopping converters
H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
96.
Method and system for detecting a defect on the DC power supply bus of a power converter
determination of a defect on the DC power supply bus as a function of the rate of the said variation, the said defect consisting of an anomaly on the inductor (L1) of the DC power supply bus, a power overload of the power converter, or advanced wear of the bus capacitor (Cbus).
The invention relates to a control device intended to be employed in a switched electrical power supply system, said system being able in particular to be employed in a variable speed drive to power its electronics. The control device comprises a first transistor intended to receive control signals originating from a control unit and a second transistor connected in series with the first transistor and provided with a floating-control gate.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H03K 17/10 - Modifications for increasing the maximum permissible switched voltage
H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
H03K 17/74 - Electronic switching or gating, i.e. not by contact-making and -breaking characterised by the use of specified components by the use, as active elements, of diodes
A testing finger (1) comprises a finger-shaped rod (2). A sharp end (3) of the finger-shaped rod (2) is connected with a testing part used for measuring a distance. The testing part is a group of testing heads, and the length of each testing head corresponds to minimum safe distances at different voltage levels in intrusion protection. The testing part is connected with the sharp end (3) of the finger-shaped rod (2) in a detachable insertion manner. The testing finger (1) can accurately determine whether the distance between a live part or a live lead which is not insulated in an electrical device and a protective part is greater than or equal to a minimum safety distance, thereby solving the problem in the prior art that the distance between the sharp end (3) of the finger-shaped rod (2) and the live part or the live lead cannot be accurately measured by a clamp in a situation of limited space.
G01B 5/14 - Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
G01B 3/30 - Bars, blocks, or strips in which the distance between a pair of faces is fixed, although it may be preadjustable, e.g. end measure, feeler strip
99.
MODULE FOR THE REGENERATION OF ELECTRICAL ENERGY FOR A SPEED VARIATOR
The invention concerns a module for the regeneration of electrical energy, intended to be fitted to a speed variator, said module comprising: - two input terminals (d, e) each intended to be connected to a power supply line of the supply DC bus of the speed variator, - three output terminals (a, b, c) intended to be connected to the three input phases (R, S, T) of the speed variator, - a voltage converter connected to the two input terminals (d, e) and intended to control the braking current of the electrical load (C), - a switching circuit connected in series with the voltage converter and intended to switch the braking current (lbrake) to one of the three output terminals (a, b, c).
H02P 3/22 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor by short-circuit or resistive braking
H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
H02M 1/32 - Means for protecting converters other than by automatic disconnection
H02P 3/18 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor
100.
Variable speed drive provided with a supercapacitor module
A variable-speed drive including: a DC power supply bus including a positive line and a negative line; a bus capacitor connected between the positive line and the negative line of the DC power supply bus; an inverter module supplied with power by the DC power supply bus and controlled to provide a variable voltage to an electrical load; a first switching branch connected between the positive line and the negative line of the bus and including at least one first electronic switch; and a first module including a braking resistor, or a second module including a mechanism for storing and regenerating electrical energy generated during braking of the electrical load, wherein the first module and the second module are removable and interchangeable.
H02P 3/14 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a DC motor by regenerative braking
H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 7/00 - Conversion of AC power input into DC power outputConversion of DC power input into AC power output
H02M 7/797 - Conversion of AC power input into DC power outputConversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
patents
