A control system (1) for a magnetic bearing (2) includes a first control branch (BR1) and a second control branch (BR2). The first control branch (BR1) includes at least one control means (3) configured to drive at least one first servo control shaft of the magnetic bearing. The second control branch (BR2) is identical to the first control branch (BR1). The control system (1) may also include a selection means (5) for activating the control means (4) of the second control branch (BR2) upon the failure of the control means (3) of the first control branch (BR1).
A control system (1) for a magnetic bearing (3, 4). The control system (1) comprises a control loop (BR1) for the magnetic bearing. The control loop comprises a master control node (5) and at least two slave control nodes (6, 7). The slave control nodes (6, 7,) are connected in series by a first bidirectional data bus (8) of said system. A second bidirectional data bus (9) connects the control nodes (6, 7) situated at the ends of the control loop to one another. The master control node comprises transmitting means (10).
A method for characterising the behaviour of a rotating shaft using equivalent ellipses. The method for characterising the behaviour of a rotating shaft comprises the following steps: acquiring at least two input signals over a predetermined period comprising measurements representing the movement of the rotating shaft (step 10); determining two components of the input signals, the components being orthogonal to each other (step 20); merging the two components into a bivariate signal (step 30); time-frequency decomposing the bivariate signal into spectral elements (step 40); determining an equivalent ellipse for each spectral element (step 50); and extracting at least one characterisation indicator of the rotating shaft based on parameters of the equivalent ellipse (step 80).
A method for filtering at least one signal to be filtered. The filtering being determined based on measurements representing the movement of a rotating shaft. The method includes defining at least one characterisation indicator of the rotating shaft. The characterisation indicator being obtained from a frequency analysis of the behaviour of the rotating shaft (step 120). The method includes determining a filtering template as a function of the characterisation indicator (step 130) and applying the filtering template to said signal to be filtered (step 140).
A method for controlling a rotating shaft by breakdown of measurements of said shaft into stationary and disturbance components. The method for controlling a rotating shaft comprises acquisition of a signal to be filtered (step 160); filtering and breakdown of the signal to be filtered into a stationary component and a disturbance component for each time-frequency pairing of the signal to be filtered (step 170); comparison of the stationary component with respect to a setpoint for each time-frequency pairing (step 190); comparison of the disturbance component with respect to said setpoint for each time-frequency pairing (step 200); and generation of a command of an actuator associated with said shaft such that the actuator modifies a rotation and/or positioning parameter of the rotating shaft (step 210).
A device (17) for detecting the direction of rotation of a rotor for a magnetic bearing includes comparing means (100), first determining means (105), and second determining means (107). The comparing means (100) compares the speed of rotation of the rotor with a predefined speed threshold (Se). The first determining means (105) determines the speed of rotation gradient of the rotor. The second determining means (107) determines the direction of rotation of the rotor from the result of the comparison of the speed of rotation of the rotor with the predefined speed threshold (Se) and the value of the determined parameter representative of the kinetics of the rotor.
A device for detecting a change in the direction of rotation of a rotor for a magnetic bearing. The device includes a determining means (102) and a comparing means (103). The determining means (102) determines a spacing between the axis of rotation of the rotor and the centre of gravity of the rotor. The comparing means (103) compares the spacing between the axis of rotation of the rotor and the centre of gravity of the rotor with a predefined threshold (Se) when the absolute value of the speed of rotation of the rotor is greater than a predefined imbalance detection speed threshold (SB). The comparing means (103) also detects the change in the direction of rotation of the rotor from the result of the comparison.
H02P 27/04 - 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
H02K 7/09 - Structural association with bearings with magnetic bearings
H02P 6/18 - Circuit arrangements for detecting position without separate position detecting elements
8.
METHOD FOR COMPENSATING REACTIVE POWER, ASSOCIATED CONTROL SYSTEM, AND SENSOR DRIVER CIRCUIT
A control system (15) for controlling a full bridge converter to compensate the reactive power consumed by an inductive position sensor for a rotor of an electrical machine supported by at least one active magnetic bearing is proposed. The inductive position sensor is supplied by an alternating current source. The control system (15) includes a phase shift determining means (26) to determine a phase shift (SP) between a supply voltage (VS) and a supply current (IS) delivered by the source. A first control loop (22) controls the amplitude (AC) of a control signal (SC) from the phase shift (SP). A second control loop (23) controls the phase of the control signal (SC). A third control loop (24) controls a voltage reference (VR). A controlling means (25) controls a full bridge converter according to the control signal (SC).
H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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
A transmission belt arrangement includes at least one transmission belt, at least one sensor configured to measure a parameter indicative of a distance between the at least one sensor and the at least one transmission belt, and processing circuitry configured to determine a state of the at least one transmission belt based on the parameter and/or based on the distance.
A transmission belt arrangement includes at least one transmission belt, at least one sensor configured to measure a parameter indicative of a surface mapping of the at least one transmission belt, and processing circuitry operatively connected to the at least one sensor and configured to determine a state of the at least one transmission belt based on the parameter indicative of the surface mapping.
A transmission belt arrangement includes a transmission belt, at least one sensor for providing a parameter indicative of a vibration signature of the transmission belt arrangement, and processing circuitry for determining a state of the transmission belt based on the parameter and/or based on the vibration signature indicated by the parameter.
A magnetic bearing module (1) having a position sensor (2) and a magnetic bearing (3) is disclosed. One of a connection face (5, 6) of the position sensor (2) and a connection face (9) of the magnetic bearing (3) is provided with three pegs (22, 23, 24). Each peg has a shape exhibiting symmetry of revolution of which the axis (L22, L23, L24) is parallel to the axis (L1) of the module (1). The angular spacing between the first peg (22) and the second peg (23) is 90°. The angular spacing between the second peg (23) and the third peg (24) is 90°. The other of the connection face (5, 6) of the position sensor (2) and the connection face (9) of the magnetic bearing (3) has three accommodating notches (32, 33, 34) inside each of which is mounted one of the three pegs (22, 23, 24).
A device (21) for controlling a spindle of a grinding machine (1) is disclosed. The spindle includes a rotor (5) supported by two radial magnetic bearings, one axial bearing, and a grinding wheel (6). The device includes a storage means (22) for storing control coefficients of the magnetic bearings. The device includes a means for determining a type of the grinding wheel and a type of the rolling bearing ring. A selection means (23) selects control coefficients associated with the determined types of grinding wheel and of rolling bearing ring from among the control coefficients stored in the storage means. The device also includes a means (23) for controlling the radial and axial magnetic bearings. Said means controlling the radial and axial (12) magnetic bearings on the basis of the control coefficients of the determined types of grinding wheel and of rolling bearing ring.
A transmission belt includes a belt member, and at least one sensor attached to the belt member that is configured to measure a parameter indicative of a state of the transmission belt. A transmitter is attached to the belt member and configured to transmit a signal indicative of the state of the transmission belt to a receiver. The transmission belt includes a power system configured to provide power to the at least one sensor and/or the transmitter, and the power system includes a power source and an energy converter. The energy converter is configured to receive energy, convert the received energy to electrical energy and provide the electrical energy to the power source.
A device (24) for controlling a magnetic bearing (22) includes an axis with two electromagnets (26, 28) diametrically opposed. The device (24) includes two power converters per axis of the magnetic bearing. Each power converter supplies one different electromagnet. The device includes eight power devices (40, 42, 44, 46, 48, 50, 52, 54) arranged in a first line (88) and a second line (90). Each of the first and second lines includes four power devices. A first set of four power devices (40, 42, 44, 46) are connected together to form a first power converter. A second set of four power devices (48, 50, 52, 54) are connected together to form a second power converter. Each of the first and second lines (88, 90) includes two power devices (40, 42, 44, 46) of the first set and two power devices (48, 50, 52, 54) of the second set.
A control node (3) for controlling a magnetic bearing is configured to control a servo axis of the bearing. The control node includes a synchronization module (15) configured to generate a synchronization signal (SYNC) upon receipt of synchronization information (INFO). At least one internal clock (17, 18) is configured to be synchronized with the synchronization signal (SYNC).
A rotor includes an assembly hub intended to be fixed to a shaft, a plurality of permanent magnets which are supported by the assembly hub, and a binding band holding the plurality of permanent magnets in place. The binding band includes crossed windings of reinforcing fibers arranged around the plurality of permanent magnets. Preferably, the rotor further includes a retaining sleeve formed of a unidirectional winding of a reinforcing fiber arranged around the binding band.
H02K 15/03 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
18.
Device for estimating the sensitivity of a sensor, associated method and system
A device for estimating the sensitivity of a position sensor for a magnetic bearing supporting a rotor, the sensor being capable of measuring the position of the rotor in relation to the magnetic bearing, the magnetic bearing including at least one shaft provided with at least two radially opposite coils. The device includes a control, a current-measuring component, a component for measuring the initial position of the rotor, a component for determining a variation in currents, a component for determining a movement of the rotor, and a component for determining the sensitivity of the sensor, configured to determine the sensitivity of the position sensor based on a movement setpoint and on the value of a movement of the rotor.
G01D 5/20 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
The present invention relates to a transmission belt providing a belt member, and at least one RFID tag attached to the belt member, the at least one RFID tag including an integrated circuit, and an antenna connected to the integrated circuit for transmitting a signal indicative of a state of the transmission belt. The signal indicative of the state of the transmission belt is determined on the basis of a current deflection of the antenna.
G01B 7/16 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
G01M 13/023 - Power-transmitting endless elements, e.g. belts or chains
20.
ROTARY ELECTRICAL MACHINE AND STATOR ASSEMBLY FOR SUCH MACHINE
Stator assembly for rotary electrical machine including a stator provided with windings. The stator assembly further includes a protecting sleeve extending around an inner surface of the windings and being made of an amagnetic material.
Rotating machine vibration monitoring process for detecting degradations within a rotating machine providing an output axle fitted with magnetic bearings, the magnetic bearings having at least a position sensor and at least a magnetic actuator, the process provides the following steps: 1) defining a set of excitations that does not destabilizes the rotating machine, 2) injecting the set of excitations in the rotating machine through the magnetic actuators and 3) measuring the response of the rotating machine checking whether the response verifies at least one predefined criterium, 4) if it is not the case, adjusting the properties of the set of excitations and resuming the process at the injection step, 5) if the response verifies the at least one criterium, determining at least one condition indicator based on the response measured, 6) determining if an alarm is to be triggered based on the condition indicator determined.
A stator assembly for rotary electrical machine including a stator provided with windings. A sealing and cooling element is overmolded onto the stator.
H02K 9/10 - Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
H02K 1/04 - Details of the magnetic circuit characterised by the material used for insulating the magnetic circuit or parts thereof
H02K 7/09 - Structural association with bearings with magnetic bearings
H02K 21/14 - Synchronous motors having permanent magnetsSynchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
23.
Rotary electrical machine and rotor for such machine
A rotor for rotary electrical machine. The rotor providing a shaft and magnets supported by the shaft. The rotor further provides a protecting sleeve, extending around an outer surface of the magnets and being made at least partially of PEEK or epoxy resin.
H02K 1/04 - Details of the magnetic circuit characterised by the material used for insulating the magnetic circuit or parts thereof
H02K 5/02 - Casings or enclosures characterised by the material thereof
24.
Device for estimating the temperature of a stator coil of a magnetic bearing, associated magnetic suspension system and method for estimating the temperature of a stator coil
A method for estimating the temperature of a stator coil of a magnetic suspension bearing of a rotor that is connected by connection wires to circuits for servo-controlling the position of the rotor includes the following steps: measuring the electric voltage at the terminals of the connection wires of the stator coil; measuring the intensity of the current passing through the stator coil; estimating the electric resistance of the stator coil and of the connection wires on the basis of an adaptive filter, the measured electric voltage and the intensity of the measured current; and estimating the temperature of the coil on the basis of the value of the estimated resistance.
A system for compensating for the stresses applied to a bearing that rotatably supports a rotor shaft of a rotating machine relative to a stator of the machine. The system provides at least one sensor for measuring an input signal positioned on an element of the bearing, a module for acquiring the input signal configured to convert the input signal into a value of the deformation applied to the rolling bearing, a module for determining a compensation signal as a function of the deformation value, and an amplifier module configured to control a magnetic actuator rotatably supporting the shaft of the rotor and including at least one electromagnet, the amplifier module being configured to convert the compensation signal into a voltage signal transmitted to the electromagnet of the magnetic actuator, the magnetic actuator being configured to exert a force on the rotor shaft as a function of the voltage signal.
The method for obtaining a temporal model of a magnetic bearing provides the generation of reference data representative of characteristics of the bearing. The method includes the production of the temporal model of the magnetic bearing from the reference data having temporal data.
G06F 30/27 - Design optimisation, verification or simulation using machine learning, e.g. artificial intelligence, neural networks, support vector machines [SVM] or training a model
27.
System for controlling at least one active magnetic bearing equipping a rotating machine comprising a rotor and a stator, and corresponding method
System for controlling at least one active magnetic bearing equipping a rotating machine comprising a rotor and a stator, at least one means for measuring the radial positions of the rotor as a function of the signal from at least one position sensor, and at least two control loops of the active magnetic bearing as a function of the radial positions of the rotor, each control loop of the magnetic bearing being provided with at least one synchronous filter as a function of the rotation speed, and an extended Kalman filter for determining the rotation speed of the rotor with respect to the stator receiving as input, from position sensors, measurements of radial position of the rotor and as a function of measurements of radial position of the rotor performed over a predetermined time at zero rotor rotation speed.
The invention refers to a method of manufacturing a pressure tank, comprising an inner container and an outer layer made of a fiber material which is wound around the inner container. In performing the method, a retention device with several retention elements protruding therefrom is attached to an inner container so as to wind a local pole cap reinforcement in a dome-shaped pole cap portion of the inner container. Then the retention device is removed and an outer layer is produced by winding of fiber material, the outer layer surrounding the central portion and the pole cap portions of the inner container.
A lamination stack for use in a rotating electrical machine includes a plurality of sheets of ferritic material. Each of the sheets has first and second sides that include asperities, and the asperities have a height of about two microns and a width of about two microns. A layer of electrically insulating material is provided between adjacent pairs of the ferritic sheets in the stack, and the asperities extend into the electrically insulating material.
H02K 1/02 - Details of the magnetic circuit characterised by the magnetic material
H02K 7/09 - Structural association with bearings with magnetic bearings
H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
Condition monitoring device including a condition monitoring sensor configured to acquire vibration signals produced by the system and an integrated power supply having an energy harvester for providing power energy to the condition monitoring sensor and having an electromagnetic coil and a permanent magnet. The integrated power supply includes a system power switch between the energy harvester and the condition monitoring sensor and configured to be switched between at least a first high impedance position providing power energy of the energy harvester to the sensor and a second low impedance position where no power is transmitted to the sensor. Also, a system for restricting movement of the energy harvester configured to be connected across the electromagnetic coil in the low impedance passive position of the system power switch.
H02K 35/02 - Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving magnets and stationary coil systems
G01H 11/06 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
H02N 2/18 - Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
H02J 50/00 - Circuit arrangements or systems for wireless supply or distribution of electric power
A radial magnetic bearing assembly having an unsymmetrical stator. The assembly comprises fewer or smaller electromagnets, and thus capacity, in the two lower quadrants below the rotor in use, in comparison to the electromagnets, and thus capacity, in the two upper quadrants above the rotor in use. This creates space in the two lower quadrants that can advantageously be used to move for example instrumentation and cooling from other places of the assembly to make the bearing assembly compactor, and also to be able to put instrumentation and cooling where it is best needed, close to the rotor.
A landing bearing assembly for a rotary machine rotatable around a central axis and having a stator, a rotor with a shaft, a magnetic bearing, an auxiliary rolling bearing with two lateral faces, a landing sleeve facing, in normal operation of the rotary machine when the rotor is supported only by the magnetic bearing, the auxiliary rolling bearing at a nominal distance defined as the landing airgap El, the auxiliary rolling bearing coming into contact with the landing sleeve upon landing of the rotor in the event of a high shock. The assembly further provides a compliance ring with a nominal thickness Eo made from a material with a lower mechanical stiffness than the material constituting the other components of the landing bearing assembly to first absorb some energy of the shock by elastic deformation resulting in a reduction of its thickness.
A sensor for operating in an environment subjected to corrosive gases or liquids under pressure, including a housing inside which are installed: a sensing portion, at least one wire electrically connected to the sensing portion, and a seal for sealing the connection between the sensing portion and the at least one wire, with at least one through-hole receiving a portion of the at least one wire. The sensor further including a compressor installed inside the housing, movable with respect to the housing and adapted to contact the seal in order to compress. The seal is made from a single material that is softer than the material constituting the housing. Upon displacement of the compressor, the seal is deformed until the creation of a compression force exerted by the seal onto the portion of the at least one wire, prevents any passage of corrosive gases or liquids between the seal therebetween.
A landing bearing assembly for a rotary machine having a stator assembly, a rotor assembly and a magnetic bearing. The landing bearing assembly having a stator landing portion integral with the stator assembly and a rotor landing portion integral with the rotor assembly. A first coating, which is an anti-wear and/or an anti-friction coating, is dispensed on at least one of the stator landing portion and the rotor landing portion. The invention also concerns such a rotary machine.
The invention concerns a landing bearing assembly (10) for a rotary machine (1) comprising a stator assembly (20), a rotor assembly (30) and a magnetic bearing (40), the landing bearing assembly (10) comprising a stator landing portion (21) integral with the stator assembly (20) and a rotor landing portion (32) integral with the rotor assembly (30). A first coating (26, 36), which is an anti-wear and/or an anti-friction coating, is dispensed on at least one of the stator landing portion (21) and the rotor landing portion (32).The invention also concerns such a rotary machine.
The invention relates to a method of manufacturing a lamination stack used in a rotating electrical machine. The method includes providing naked sheets made of ferritic material; preparing both sides of each sheet so as to obtain a determined surface roughness; coating at least one side of each sheet with an chemically protective electrically insulating material; stacking the coated sheets; compressing the stack obtained; heating the compressed stack at a temperature above the melting temperature of the insulating material; and cooling down the compressed stack so as to form an integral lamination stack consisting of alternating sheets of ferritic material and layers of insulating material. The invention also relates to an electrical machine comprising such a lamination stack.
H01F 3/04 - Cores, yokes or armatures made from strips or ribbons
H01F 7/06 - ElectromagnetsActuators including electromagnets
H02K 1/02 - Details of the magnetic circuit characterised by the magnetic material
H02K 7/09 - Structural association with bearings with magnetic bearings
H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
37.
METHOD OF MANUFACTURING A LAMINATION STACK FOR USE IN AN ELECTRICAL MACHINE
The invention relates to a method of manufacturing a lamination stack (31, 41) for use in a rotating electrical machine (10), the method comprising steps of: - providing naked sheets made of ferritic material; - preparing both sides of each sheet so as to obtain a determined surface roughness; - coating at least one side of each sheet (60) with an chemically protective electrically insulating material; - stacking the coated sheets; - compressing the stack thus obtained; - heating the compressed stack at a temperature above the melting temperature of the insulating material; and - cooling down the compressed stack so as to form an integral lamination stack consisting of alternating sheets (60) of ferritic material and layers (70) of insulating material. The invention also relates to an electrical machine comprising such a lamination stack.
A device for detecting the axial position of a rotor shaft of a rotary machine having a stator and a rotor is provided. The detecting device includes a sensor stator ring, secured to the stator, made from ferromagnetic material, facing the shoulder of one end of the hollow or not hollow rotor shaft and arranged so as to leave an axial airgap with the one end of the rotor shaft. The sensor stator ring having at least one annular slot receiving an annular induction coil. The rotor shaft is made from solid magnetic steel, an outer end of the rotor shaft acts as a target surface whose axial position is to be measured by the sensor stator ring.
G01D 5/20 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
G01B 7/00 - Measuring arrangements characterised by the use of electric or magnetic techniques
H02K 7/09 - Structural association with bearings with magnetic bearings
A balancing method for balancing at high speed a flexible rotor of a rotary machine, the rotary machine having a stator, and the rotor being supported in the stator by at least two radial magnetic bearings. The balancing method including a step of placing the rotor inside the stator, a step of performing at least one first run in order to identify amplitude and angular location of the unbalance in a first speed range below critical speed, a step of placing first balancing masses inside the rotor on predefined first balancing planes, a step of performing at least one second run in order to identify amplitude and angular location of the unbalance in a second speed range above critical speed, and a step of placing second balancing masses inside the rotor on predefined second balancing planes.
Device for detecting the axial position of a rotor shaft (16) of a rotary machine having a stator and a rotor. The detecting device comprises a sensor stator ring (31), secured to the stator, made from ferromagnetic material, facing the shoulder of one end (16b) of the hollow or not hollow rotor shaft (16) and arranged so as to leave an axial airgap (e0+x) with said one end (16b) of the rotor shaft (16), said sensor stator ring (31) comprising at least one annular slot (32, 33) receiving an annular induction coil (34, 35). The rotor shaft (16) is made from solid magnetic steel, an outer end (16b) of the rotor shaft (16) acts as a target surface whose axial position is to be measured by the sensor stator ring (31).
Balancing method for balancing at high speed a flexible rotor of a rotary machine comprising a stator, said rotor being supported in said stator by at least two radial magnetic bearings. The balancing method comprises a step of placing the rotor inside the stator, a step of performing at least one first run in order to identify amplitude and angular location of the unbalance in a first speed range below critical speed, a step of placing first balancing masses inside the rotor on predefined first balancing planes, a step of performing at least one second run in order to identify amplitude and angular location of the unbalance in a second speed range above critical speed, and a step of placing second balancing masses inside the rotor on predefined second balancing planes.
A rotary machine provides a stator having a stator casing, and a rotor shaft having a rotational axis and supported in the stator casing by at least one radial magnetic bearing. The rotary machine further provides an axial mechanical thrust bearing being disposed proximate a radial surface of one end of the rotor shaft, the axial mechanical thrust bearing, including a rolling element located on the rotational axis of the rotor shaft.
H02K 7/09 - Structural association with bearings with magnetic bearings
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
F16C 17/08 - Sliding-contact bearings for exclusively rotary movement for axial load only for supporting the end face of a shaft or other member, e.g. footstep bearings
F16C 19/12 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for axial load mainly for supporting the end face of a shaft or other member, e.g. footstep bearings
F16C 27/00 - Elastic or yielding bearings or bearing supports, for exclusively rotary movement
H02K 5/16 - Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
F16C 19/10 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for axial load mainly
H02K 7/00 - Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
A rotary machine (10) comprises a stator (12) having a stator casing (18), and a rotor shaft (16) having a rotational axis (X-X) and supported in said stator casing (18) by at least one radial magnetic bearing (20, 22). The rotary machine (10) comprises an axial mechanical thrust bearing (24, 30) at the vicinity of a radial surface of one end (16b) of the rotor shaft (16), said axial mechanical thrust bearing (24, 30) comprising a rolling element (24a, 32) located on the rotational axis (X-X) of the rotor shaft (16).
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
44.
ELECTRICAL INSTALLATION COMPRISING AN ELECTRICAL APPARATUS, A THREE-PHASE INVERTER AND A CONTROL DEVICE FOR CONTROLLING THE INVERTER, AND RELATED METHOD
The invention concerns an electrical installation (10) comprising an apparatus (15), a three-phase inverter (20) and a control device (25), the inverter (20) being adapted for generating a three-phase current (C) presenting a first frequency (f1) for operating the apparatus (15) and an undesired frequency component presenting a second frequency (f2). The control device (25) is adapted for measuring a parameter (p1, p2, p3) of each phase (P1, P2, P3) of the current (C), the measured parameters (p1, p2, p3) forming a measurement vector (Vm), and for calculating a Clarke transform, comprising a first vector (V1) represented in a first basis of a two-dimensional vector space, of the measurement vector (Vm). The control device (25) is adapted for generating a representation of the first vector (V1) in a second basis of the vector space, the second basis rotating at the second frequency (f2) with respect to the first basis.
A radial position sensor is disclosed. The sensor includes means for measuring the position of a rotor along a first axis radial to a rotation axis of the rotor and along a second axis perpendicular to the first axis. The measuring means include four or eight magnetic poles. The magnetic poles are distributed, on the inner surface of a stator, with alternating magnetic polarities around the entire circumference of the stator. The poles are arranged so that each pole deviates by an angle of approximately 300 from the nearest axis among the first axis and the second axis. Each pole is formed by an electromagnet.
A radial position sensor that measures a radial position of a rotor within a stator is provided. The radial position sensor provides measures the radial position of the rotor along a first axis radial to a rotation axis of the rotor and along a second axis perpendicular to the first axis. The radial position sensor includes four magnetic poles, among which two poles are diametrically opposed along the first axis and two other poles are diametrically opposed along the second axis.
G01D 5/20 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
H02K 11/215 - Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
H02K 7/09 - Structural association with bearings with magnetic bearings
47.
Electrical installation comprising an electrical apparatus, a three-phase inverter and a control device for controlling the inverter, and related method
The invention concerns an electrical installation providing an apparatus, a three-phase inverter and a control device, the inverter being adapted for generating a three-phase current presenting a first frequency for operating the apparatus and an undesired frequency component presenting a second frequency. The control device is adapted for measuring a parameter of each phase of the current, the measured parameters forming a measurement vector, and for calculating a Clarke transform, providing a first vector represented in a first basis of a two-dimensional vector space, of the measurement vector. The control device is adapted for generating a representation of the first vector in a second basis of the vector space, the second basis rotating at the second frequency with respect to the first basis.
H02P 21/05 - Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for damping motor oscillations, e.g. for reducing hunting
H02P 21/00 - Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
H02P 6/10 - Arrangements for controlling torque ripple, e.g. providing reduced torque ripple
This rotary machine (1') comprises a shaft (3) and a housing (5). The shaft (3) is rotatable with respect to the housing (5) thanks to at least one axial magnetic bearing (7) including a magnetic thrust disc (70) coupled in rotation to the shaft (3) and magnetic actuators (72, 74) fixed to the housing (5) and located axially around the magnetic thrust disc (70). This rotary machine comprises a magnetically insulating insert (4) mounted between the magnetic thrust disc (70) and the shaft (3) so that there is no contact between the magnetic thrust disc (70) and the shaft (3).
A sensor assembly includes an annular target body disposed about a rotatable member outer surface and an annular angular position indicator with at least one angular position index corresponding to an angular position of the member. Radial displacement sensors are spaced circumferentially about the axis and radially outwardly from the target body outer surface. A reference sensor is disposed circumferentially between two of the radial displacement sensors, has an inner end spaced outwardly from the target body surface by a first spacing distance, and is configured to detect the target body. An angular displacement sensor is spaced axially from the reference sensor and has an inner end spaced outwardly from the position indicator surface by a second spacing distance. The angular sensor is located such that the second spacing distance is generally equal to the first spacing distance and such that the position index passes the sensor inner end.
G01D 5/00 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable
G01D 5/12 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means
G01P 3/00 - Measuring linear or angular speedMeasuring differences of linear or angular speeds
G01P 3/44 - Devices characterised by the use of electric or magnetic means for measuring angular speed
50.
Stator assembly and magnetic bearing or electric motor having such a stator assembly
A stator assembly having a housing and a stator that are concentric, the stator being mounted radially inside the housing is provided. This stator assembly includes fastening elements that are mounted between a radial inner surface of the housing and a radial outer surface of the stator and exert a radial fastening force on the housing and the stator.
H02K 7/00 - Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
H02K 1/18 - Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
H02K 5/04 - Casings or enclosures characterised by the shape, form or construction thereof
H02K 7/09 - Structural association with bearings with magnetic bearings
51.
Stator assembly and magnetic bearing or electric motor having such a stator assembly
A stator assembly that provides a concentric housing and stator, the stator radially positioned inside the housing, the housing having an inner surface, the stator having an outer surface radially facing the inner surface. One of the outer surface of the stator and the inner surface of the housing has recessed shapes and the other one of the outer and inner surface has protruding shapes. When the two shapes are arranged in a first relative position, the protruding shapes are inserted in the recessed shapes so that the stator can be mounted radially inside the housing along a central axis of the assembly, and in a second relative position that is angularly shifted relative to the first position around the central axis, the protruding shapes exert, against the one of the housing and the stator that bears the recessed shapes, a radial force that angularly and axially locks the stator.
H02K 7/09 - Structural association with bearings with magnetic bearings
H02K 1/18 - Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
H02K 5/04 - Casings or enclosures characterised by the shape, form or construction thereof
H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
H02K 1/12 - Stationary parts of the magnetic circuit
52.
STATOR ASSEMBLY AND MAGNETIC BEARING OR ELECTRIC MOTOR COMPRISING SUCH A STATOR ASSEMBLY
This stator assembly (1) comprises a housing (3) and a stator (5) which are concentric, the stator (5) being mounted radially inside the housing (3), the housing (3) having an inner surface (30) and the stator (5) having an outer surface (50) which radially faces the inner surface (30) of the housing (3). One of the outer surface (50) of the stator (5) and the inner surface (30) of the housing (3) has recessed shapes (302; 30a; 56; 58) and the other one of the outer surface (50) of the stator (5) and the inner surface (30) of the housing (3) has protruding shapes (52; 54; 32). The recessed shapes and the protruding shapes are arranged so that in a first relative position of the housing (3) and the stator (5), the protruding shapes are inserted in the recessed shapes so that the stator (5) can be mounted radially inside the housing (3) along a central axis (X-X') of the assembly (1), and in a second relative position of the housing (3) and the stator (5), which is angularly shifted relative to the first position around the central axis (X- X'), the protruding shapes exert, against the one of the housing (3) and the stator (5) which bears the recessed shapes, a radial force (F) which angularly and axially locks the stator (5) with respect to the housing (3).
A method of protecting ferromagnetic lamination stacks of a component of an electric machine, comprises the following steps: creating a component module by arranging a laminations stack of ferromagnetic sheets into a housing, (b) protecting locations of the component module where coating is unwanted, (c) inserting the component module into a hermetic chamber receiving an ionized gas, (d) polarizing the component module to submit a fixed electric potential to the component module, (e) depositing a thin layer of protective coating on the laminations stack of ferromagnetic sheets through a method of Plasma Enhanced Chemical Vapor Deposition (PECVD) at a temperature lower than 150° C., (f) monitoring the deposition homogeneity and deposition thickness of the thin layer of protective coating until desired thickness, and (g) rectifying the surface of the thin layer of protective coating to have a uniform protective layer.
H02K 5/12 - Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
H02K 7/09 - Structural association with bearings with magnetic bearings
H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
H02K 15/12 - Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
H01F 3/02 - Cores, yokes or armatures made from sheets
C23C 16/04 - Coating on selected surface areas, e.g. using masks
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
54.
Magnetic bearing, rotary apparatus comprising such a magnetic bearing and method for manufacturing such a magnetic bearing
A magnetic bearing, adapted to equip a rotary apparatus. The magnetic bearing comprises: an actuator sub-assembly provided with a magnetic base and at least three actuator bobbins mounted on the magnetic base, and a sensor sub-assembly provided with at least three magnetic sensors associated with the actuator bobbins. At least one sub-assembly amidst the actuator sub-assembly and the sensor sub-assembly comprises at least three sectors mounted together. Each sector includes at least one actuator bobbin when the sector belongs to the actuator sub-assembly, or at least one magnetic sensor when the sector belongs to the sensor sub-assembly. The invention also concerns a rotary apparatus comprising such a magnetic bearing and a method for manufacturing such a magnetic bearing.
A magnetic bearing, comprising: a magnetic base; at least three actuator bobbins mounted on the magnetic base; and magnetic sensors associated with the actuator bobbins. At least one magnetic system amidst the magnetic actuators and the magnetic sensors comprises together: a coil holder; a coil wound up around the coil holder; and a connector device integrated to the coil holder and designed for plugging at least one wire. Additionally disclosed is an apparatus comprising such a magnetic bearing and a method for manufacturing such a magnetic bearing.
H01F 7/06 - ElectromagnetsActuators including electromagnets
H01R 4/2416 - Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type
56.
Method and system for determining core losses in a permanent magnet synchronous motor
A method and system for determining core losses in a permanent magnet synchronous motor, comprising a measurement of the losses of the motor with the motor not connected to a load, and a deduction of the core losses of the motor from the losses of the motor. The motor is placed in an over-fluxing state during the measurement of the losses.
Method and system for determining core losses in a permanent magnet synchronous motor, comprising a measurement of the losses of the motor with the motor not connected to a load, and a deduction of the core losses of the motor from the losses of the motor. The motor is placed in an over-fluxing state during the measurement of the losses.
A position detection device of active magnetic bearings (AMB's) maintaining the position of a rotating shaft and comprising two sensing inductance coils, the position detection device comprising a programmable digital component for generating a 25 KHz square waveform signal, a current amplifier receiving the 25 KHz square waveform signal and injecting two identical control currents in the two sensing inductance coils, a differential amplifier for amplifying a voltage difference between the resulting voltages in the two sensing inductance coils and, depending on the displacement of the rotating shaft, an analog to digital (A/D) converter for delivering a position value from the voltage difference.
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
G01D 5/20 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
G01D 5/22 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
An axial magnetic bearing comprising a rotor stop disc which is mounted perpendicularly and integral with a rotating shaft and a coaxially stator assembly and comprising at least one stator element of magnetic material having an inner face parallel to a side of the rotor stop disc and separated from it by an air gap, the at least one stator element comprising two annular coils and housed in two annular notches formed continuously in the magnetic material of the at least one stator element and opening to the side of the rotor stop disc, the two annular notches being separated by an annular tooth, rolled in series and are formed by a single continuous wire, a bridging recess being cut in the annular tooth for receiving a massive insert part that extends the annular tooth without locally modifying the air gap with the rotor stop disc.
An electronic magnetic bearing controller for controlling the position of a rotor of an electrical machine supported by an active magnetic bearing the position of which being measured by at least one inductive position sensor having an inductive coil, comprising an automatic reactive power compensation device for automatically compensating the reactive power consumed by the inductive position sensor.
G01D 5/20 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
61.
Compact turbomachine with magnetic bearings and auxiliary bearings
A turbo-machine for compressing or expanding a fluid comprises a housing, a rotary shaft, an electric machine, an impeller mounted at an end of the rotary shaft, radial magnetic bearings, an axial magnetic bearing, an axial detector, radial detectors, a control circuit, and auxiliary bearings. An auxiliary bearing is integrated within a stator portion of the axial magnetic bearing and this stator portion of the axial magnetic bearing is located opposite a rotor armature of the axial magnetic bearing. The rotor armature is made of iron or of a material which is adapted to be attracted in a magnetic field and is constituted by a rear face of the impeller.
A rotary machine, comprising: a stator assembly and a rotor assembly centered on a central axis; a magnetic bearing; and an auxiliary bearing including a first ring held in the stator assembly and a second ring delimiting a gap radially to the central axis relative to the rotor. The second ring is not rotating around the central axis in a primary operation mode and is dragged in rotation around the central axis in a secondary operation mode. The rotary machine includes a monitoring system for detecting a transition from the primary operation mode to the secondary operation mode. The monitoring system comprises a target formed on the second ring and a sensor unit fixed relative to the stator assembly. A bearing and a method for manufacturing a rotary machine are additionally disclosed.
F16C 19/54 - Systems consisting of a plurality of bearings with rolling friction
F16C 19/16 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
63.
ROTARY MACHINE, BEARING AND METHOD FOR MANUFACTURING A ROTARY MACHINE
The invention concerns a rotary machine (1), comprising: a stator assembly (3) and a rotor assembly (4) centered on a central axis (X1); a magnetic bearing (5); and an auxiliary bearing (10) including a first ring (13) held in the stator assembly (3) and a second ring (14) delimiting a gap (G) radially to the central axis (X1) relative to the rotor (4). The second ring (14) is not rotating around the central axis (X1) in a primary operation mode and is dragged in rotation around the central axis (X1) in a secondary operation mode. The rotary machine (1) includes a monitoring system (50) for detecting a transition from the primary operation mode to the secondary operation mode. The monitoring system (50) comprises a target (60) formed on the second ring (14) and a sensor unit (70) fixed relative to the stator assembly (3). The invention also concerns a bearing and a method for manufacturing a rotary machine (1).
A modular motor and magnetic bearing assembly comprising a positioning casing having a plane reference surface, an outer cylindrical reference surface, a central portion provided on an outer face with cooling liquid flow channels, and intermediate portions provided with openings for gaseous fluid entry and exit; a rotor presenting an inner cylindrical reference surface and a plane reference surface; an electric motor; radial magnetic bearings; an axial abutment; and auxiliary mechanical bearings. The modular assembly can then be incorporated in a main casing simply by sliding and it can be connected directly to a functional unit without reworking adjustments of the magnetic bearings.
H02K 7/09 - Structural association with bearings with magnetic bearings
H02K 5/20 - Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
H02K 7/00 - Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
H02K 9/19 - Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
H02K 15/00 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
65.
A MODULAR MOTOR AND MAGNETIC BEARING ASSEMBLY, AND A MANUFACTURING METHOD THEREFOR
A modular motor and magnetic bearing assembly comprises a positioning casing (1) having a plane reference surface (17), an outer cylindrical reference surface (15), a central portion provided on an outer face with cooling liquid flow channels (11), and intermediate portions provided with openings (18, 19) for gaseous fluid entry and exit; a rotor (4) presenting an inner cylindrical reference surface (41) and a plane reference surface (42); an electric motor (6); radial magnetic bearings (7, 8); an axial abutment (3); and auxiliary mechanical bearings (91, 92). The modular assembly can then be incorporated in a main casing (150) simply by sliding and it can be connected directly to a functional unit (250) without reworking adjustments of the magnetic bearings (3, 7, 8).
A rotor sensor target for magnetic bearings, the rotor sensor target comprising a ring-shaped assembly of magnetic material mounted on a generally ring-shaped assembly of non-magnetic material. The magnetic and non-magnetic ring shaped assemblies are coaxially arranged and mounted on a shaft having a longitudinal axis of rotation X′-X. The generally ring-shaped assembly of non-magnetic material comprises at least one ring-shaped slit having the longitudinal axis X′-X and may be made of a cheaper material, such as aluminum. The ring-shaped slit provides flexibility which permits operation over a wide range of temperatures without risking of damaging the ring-shaped assembly of magnetic material.
G01B 7/30 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapersMeasuring arrangements characterised by the use of electric or magnetic techniques for testing the alignment of axes
G01D 5/14 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
G01D 5/20 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
A rotor sensor target for magnetic bearings comprises a ring-shaped assembly of magnetic material (30) mounted on a generally ring-shaped assembly of non-magnetic material (40, 50, 60), which are coaxially arranged and mounted on a shaft (20) having a longitudinal axis of rotation X'-X. The generally ring- shaped assembly of non-magnetic material (40, 50, 60) comprises at least one ring-shaped slit (61) having the longitudinal axis X'-X and may be made of a cheaper material such as aluminum. The ring-shaped slit (61) provides flexibility which permits operation over a wide range of temperatures without risking of damaging the ring-shaped assembly of magnetic material (30).
A permanent magnet rotor assembly comprises a cylindrically shaped shaft (1) having an outer surface, a plurality of permanent magnets (22) constituting portions of annular segments and an outer retaining cylindrical sleeve (23) surrounding the plurality of permanent magnets (22). The assembly further comprises a cylindrical magnet housing (21) mounted on the cylindrically shaped shaft (1) for supporting the plurality of permanent magnets (22). The cylindrical magnet housing (21) is formed of a magnetic material. The retaining cylindrical sleeve (23) is preloaded by a resultant interference fit IF2 which is defined by the following formula:where 1)1( is an external diameter of the plurality of permanent magnets (22), 1)X is an internal diameter of the cylindrical magnet housing (21), and IF1 is a primary interference fit between an external diameter of the cylindrically shaped shaft (1) and the internal diameter of the cylindrical magnet housing (21).
H02K 1/28 - Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
H02K 15/03 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
69.
Digital nonlinear corrector for active magnetic bearings
A digital nonlinear corrector of an active magnetic bearing receiving an input signal x(t) and outputting an output control signal u(t) for controlling the position of said active magnetic bearing, the input signal being digitalized by a ADC circuit and provided to an adder, the digital nonlinear corrector comprising a closed control loop delivering an intermediary sequence of numbers y[kT] and having a direct branch comprising a first proportional gain circuit and a feedback branch comprising a series connection of a low-pass filter and a dead zone circuit, such that said low-pass filter is activated when determined upper and lower values of said output control signal are reached, the output control signal reproducing the input signal when these determined upper and lower values are not reached.
A thrust disc for a magnetic bearing, wherein the thrust disc comprises: a body, which is adapted to be mounted on a shaft and which has a first offset yield strength and a first magnetic permeability, and at least one flange which is fixed to the body in a position where it can interact with a thrust stator in order to form a magnetic bearing and which has a second offset yield strength and a second magnetic permeability; wherein the first offset yield strength is higher than the second offset yield strength; and wherein the first magnetic permeability is smaller than the second magnetic permeability. Additionally, the magnetic bearing can be equipped with such a thrust disc. An apparatus can be equipped with such a magnetic bearing.
A permanent magnet rotor assembly includes a cylindrically shaped shaft having an outer surface, a plurality of permanent magnets constituting portions of annular segments and an outer retaining cylindrical sleeve surrounding the plurality of permanent magnets. The assembly further includes a cylindrical magnet housing mounted on the cylindrically shaped shaft for supporting the plurality of permanent magnets. The cylindrical magnet housing is formed of a magnetic material. The retaining cylindrical sleeve is preloaded by a resultant interference fit IF2 defined by the following formula IF2=−ØY+√{square root over (((ØY+IF1)^2+ØY^2−ØX^2))}, where ΦY is an external diameter of the plurality of permanent magnets, ΦX is an internal diameter of the cylindrical magnet housing, and IF1 is a primary interference fit between an external diameter of the cylindrically shaped shaft and the internal diameter of the cylindrical magnet housing.
H02K 15/00 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
H02K 1/28 - Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
H02K 15/03 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
72.
DIGITAL NONLINEAR CORRECTOR FOR ACTIVE MAGNETIC BEARINGS
Digital nonlinear corrector (10) of an active magnetic bearing receiving an input signal x(t) and outputting an output control signal u(t) for controlling the position of said active magnetic bearing, the input signal being digitalized by a ADC circuit (12) and provided to an adder (16), the digital nonlinear corrector comprising a closed control loop delivering an intermediary sequence of numbers y[kT] and having a direct branch comprising a first proportional gain circuit (22) and a feedback branch comprising a series connection of a low-pass filter (18) and a dead zone circuit (20), such that said low-pass filter is activated when determined upper and lower values of said output control signal are reached, the output control signal reproducing the input signal when these determined upper and lower values are not reached.
An electrical device comprising a housing having cooling fins located in a central portion along an exterior surface of the housing and a laminated magnetic stack disposed within the housing and interfacing with an interior surface of the housing at the central portion. The cooling fins are configured alternatively higher and smaller on an inlet manifold and in opposition on an outlet manifold.
A radial magnetic bearing having an inner rotor including a central shaft having a ferromagnetic armature mounted on the shaft and an outer stator providing a plurality of electromagnets including poles made of ferromagnetic material which project radially inwardly towards the rotor is provided. As such, air-gaps (e) are left between end faces of the poles and the ferromagnetic armature, and coils wound around the poles. The poles are extended through outer portions attached to a supporting member. Each pole and the corresponding outer portion are included in an angularly segmented module providing a stack of laminations made of ferromagnetic material. The outer portion defines shoulders with respect to the corresponding pole, the outer portion contacting outer portions of neighboring segmented modules and the outer portions of all segmented modules being assembled by clamping rings, wherein the coils located in free spaces around the poles are mounted in a string.
A permanent magnet rotor shaft assembly for a high speed electrical machine provides a permanent magnet cylindrical core having a longitudinal axis, the cylindrical core being axially compressed by first and second end shafts and being radially compressed by a sleeve made of a non-magnetic high strength metal. At least one of the first and second end shafts includes, facing the cylindrical core, a central shoulder head that cooperates with a mating central recess made in a central portion of a front face of the cylindrical core. An easy concentric alignment of the first and second end shafts with the permanent magnet cylindrical core is allowed while inserting the sleeve and the stiffness of the assembled set is enhanced.
H02K 15/03 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
H02K 7/09 - Structural association with bearings with magnetic bearings
H02K 1/02 - Details of the magnetic circuit characterised by the magnetic material
An assembly includes a rotating shaft supported with respect to a stationary housing by at least one active magnetic bearing presenting a mean radial air gap and at least one auxiliary bearing having first and second coaxially arranged annular surfaces is provided. One of the first and second coaxially arranged annular surfaces defines a clearance (E2) with one of the stationary housing and the rotating shaft, the clearance (E2) being less than the mean radial air gap and the other of the first and second coaxially arranged annular surfaces being integral with the other one of the stationary housing and the rotating shaft. The auxiliary bearing provides a first ball bearing and a second ball bearing having a misalignment with respect to each other in order to increase the starting torque.
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
F16C 35/07 - Fixing them on the shaft or housing with interposition of an element
F16C 39/02 - Relieving load on bearings using mechanical means
F16C 19/54 - Systems consisting of a plurality of bearings with rolling friction
F16C 35/073 - Fixing them on the shaft or housing with interposition of an element between shaft and inner race ring
F16C 27/04 - Ball or roller bearings, e.g. with resilient rolling bodies
F16C 19/16 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
77.
AUXILIARY BEARING OF THE BALL BEARING TYPE FOR A MAGNETICALLY SUSPENDED ROTOR SYSTEM
An assembly comprises a rotating shaft (104, 114) supported with respect to a stationary housing (105, 115) by at least one active magnetic bearing presenting a mean radial air gap and at least one auxiliary bearing (118) comprising first and second coaxially arranged annular surfaces (124, 123), one (124) of the first and second coaxially arranged annular surfaces (124, 123) defining a clearance (E2) with one of the stationary housing (105, 115) and the rotating shaft (104, 114), the clearance (E2) being less than the mean radial air gap and the other (123) of the first and second coaxially arranged annular surfaces (124, 123) being integral with the other one of the stationary housing (105, 115) and the rotating shaft (104, 114). The auxiliary bearing (118) comprises a first ball bearing and a second ball bearing having a misalignment with respect to each other in order to increase the starting torque.
A control device for controlling the position of a rotor supported by active magnetic bearings is provided. The control device includes a trajectory planning module for generating a requested position, speed and acceleration; a feedback unit for generating a position feedback value and a speed feedback value; a first correction circuit for generating a first command signal according to the difference between the requested position and speed and the position and speed feedback value respectively; a feed-forward controller for generating a second command signal; an adder for adding first and second command signals and delivering a third command signal for a non-linear inversion circuit connected to the adder for generating flux command signals for the electromagnets, and a second correction circuit for generating voltage command signals for the power amplifiers which control the current flowing in the electromagnet coils of the active magnetic bearings.
G05D 23/275 - Control of temperature characterised by the use of electric means with sensing element expanding, contracting, or fusing in response to changes of temperature
H02K 11/00 - Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
H02P 31/00 - Arrangements for regulating or controlling electric motors not provided for in groups , or
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
A control device for controlling the position of a rotor supported by magnetic bearings is described. A trajectory planning module generates a requested position, speed and acceleration. An observer generates position and speed feedback values from measurements of a position of the rotor and current intensities in electromagnet coils of the magnetic bearings. A first correction circuit generates a first signal according to the difference between the requested position and speed and the position and speed feedback value. A feedforward controller generates a second signal according to computation of the requested position, speed and acceleration. An adder adds the first and second signals and delivers a third signal for generating flux command signals for the electromagnets. A second correction circuit generates voltage command signals for the power amplifiers which control the current flowing in the electromagnet coils according to the difference between the flux command signals and observer flux values.
An assembly that includes a rotating shaft supported with respect to a stationary housing by at least one active magnetic bearing presenting a mean radial air gap and at least one auxiliary bearing having a bushing fixed to the housing and a sleeve fixed on the rotating shaft. The bushing and the sleeve have opposite surfaces that define a clearance (E2) which is less than the mean radial air gap (E1). The bushing and the sleeve each exhibit symmetry around a longitudinal axis of the shaft and have different profiles in a longitudinal cross-section including the longitudinal axis to optimize the contact pressure distribution when the rotating shaft lands on the auxiliary bearing.
An assembly comprises a rotating shaft (10) supported with respect to a stationary housing (16) by at least one active magnetic bearing (12) presenting a mean radial air gap (El) and at least one auxiliary bearing (18) comprising on the one hand a bushing (21) fixed to the housing (16) and on the other hand a sleeve (20) fixed on the rotating shaft (10). The bushing (21) and the sleeve (20) have opposite surfaces (24, 23) defining a clearance (E2) which is less than the mean radial air gap (El). The bushing (21) and the sleeve (20) each exhibit symmetry around a longitudinal axis of the shaft (10) whilst having different profiles in a longitudinal cross-section including the longitudinal axis to optimize the contact pressure distribution when the rotating shaft (10) lands on the auxiliary bearing.
F16C 17/20 - Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load with emergency supports or bearings
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
A high speed energy storage flywheel comprises a rotor which is located in a vacuum chamber provided in a stator housing and is supported by magnetic bearings with respect to the stator housing. A fluid tank used for releasing in a controlled manner, a fluid inside the vacuum chamber and therefore create a braking effect on the rotor by friction.
F16F 15/12 - Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
H02K 7/02 - Additional mass for increasing inertia, e.g. flywheels
F16D 49/12 - Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like shaped as an encircling band extending over approximately 360° fluid actuated
A hybrid magnetic suspension of a rotor (1) having compressor wheels (2, 3) having permanent magnets (104, 114) integral to shrunk fit rings (8, 18) arranged on the rotor (1) in the vicinity of the compressor wheels (2, 3), permanent magnets (124, 134) integral to stationary rings (23, 33) coaxially arranged with the rotor (1) and associated with a resilient material (5, 15) to define a passive radial magnetic bearing, coils (6, 16) associated with magnetic armatures (10, 20) and facing rotor parts (7, 17) being located perpendicularly to the rotor (1), and axial sensors (60, 160) configured for sensing the axial position of the rotor (1) and control means (200) configured for feeding the coils (6, 16) as a function of the outputs of the axial sensors (60, 160) for generating both axial bearing forces and a motor torque and thereby being adapted for defining an axial bearingless motor.
An electrical connector making it possible to provide a sealed electrical link between an inside environment subjected to corrosive gases or liquids under pressure and an outside environment of different pressure is described. A connector body designed to be secured to a structure and provided with insulating feedthroughs for receiving electrical contacts connects the outside environment to said inside environment. Conductor cables, each including an outer insulating layer made of a fusible thermoplastic material, are connected to the electrical contacts. A "thermoplastic insulator", surrounding the conductor cables and secured to the connector body is made of a fusible thermoplastic material of the same type as the outer insulating layers of the conductor cables, making it possible, by localized fusion, to form a thermoplastic weld with the outer insulating layers of said conductor cables. A sealing element is mounted between the connector body and the thermoplastic insulator.
An electrical machine (20) coupled to a compressor (12) having a rotatable shaft (16), comprising: a rotor forming part of the rotatable shaft and having at least two magnetic portions (22A, 22B) separated by an inclined non-magnetic portion (24) and two elements (26A, 26B) of non-magnetic material at each end of the rotatable shaft, a stator comprising a laminated magnetic iron stack (28) surrounded by a winding (30) and disposed along a periphery of the rotor to define a first annular gap (32), a ring (34) of non-magnetic material disposed around the stator, and a casing (40) of magnetic material comprising permanent magnets (36), disposed around the non magnetic ring and having radial walls (40A, 40B) that project inwardly towards the rotor by defining a second annular gap (42) therebetween.
F02B 33/44 - Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs
F02B 37/10 - Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump at least one pump being alternately driven by exhaust and other drive
F02B 39/10 - Non-mechanical drives, e.g. fluid drives having variable gear ratio electric
F04D 13/06 - Units comprising pumps and their driving means the pump being electrically driven
H02K 21/44 - Synchronous motors having permanent magnetsSynchronous generators having permanent magnets with rotating flux distributors, and armatures and magnets both stationary with armature windings wound upon the magnets
H02K 11/00 - Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
H02K 5/173 - Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
An electrical machine (20) coupled to a compressor (12) having a rotatable shaft (16), comprising: a rotor forming part of the rotatable shaft and having at least two magnetic portions (22A, 22B) separated by an inclined non-magnetic portion (24) shaft, a stator comprising a laminated magnetic iron stack (28) surrounded by a winding (30) and disposed along a periphery of the rotor to define a first annular gap (32), a ring (34) of non-magnetic material disposed around the stator, a DC coil (38) disposed around the non-magnetic ring, and a casing (40) of magnetic material disposed around the DC coil and having radial walls (40A, 40B) that project inwardly towards the rotor by defining a second annular gap (42) therebetween.
F02B 37/10 - Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump at least one pump being alternately driven by exhaust and other drive
F02B 39/10 - Non-mechanical drives, e.g. fluid drives having variable gear ratio electric
F04D 13/06 - Units comprising pumps and their driving means the pump being electrically driven
H02K 19/24 - Synchronous generators having windings each turn of which co-operates alternately with poles of opposite polarity, e.g. heteropolar generators with variable-reluctance soft-iron rotors without winding
87.
TURBOCHARGER EMBEDDING AN ELECTRICAL MACHINE WITH A DC COIL
An electrical machine (20) coupled to a compressor (12) having a rotatable shaft (16), comprising: a rotor forming part of the rotatable shaft and having at least two magnetic portions (22A, 22B) separated by an inclined non-magnetic portion (24) and two elements (26A, 26B) of non-magnetic material at each end of the rotatable shaft, a stator comprising a laminate magnetic iron stack (28) surrounded by a winding (30) and disposed along a periphery of the rotor to define a first annular gap (32), a ring (34) of non-magnetic material disposed around the stator, a DC coil (38) disposed around the non-magnetic ring, and a casing (40) of magnetic material disposed around the DC coil and having radial walls (40A, 40B) that project inwardly towards the rotor by defining a second annular gap (42) therebetween.
A compact electric centrifugal compressor particularly suitable for a heat ventilation air conditioning system for vehicles comprises a motor portion (20) and a centrifugal compressor portion (10) driven by the motor portion (20) through a shaft (15). The motor portion comprises first and second radial bearingless motors (140, 150). An active axial magnetic bearing or an axial bearingless motor (130) is located between the first and second radial bearingless motors (140, 150). The motor portion is further equipped with auxiliary landing bearings (8).
2 and including a plurality of pole pieces separated from a rotor by an airgap, wherein the hermetically sealed enclosure protecting said stator from said corrosive atmosphere includes a jacket constituted by a non-magnetic cylinder having magnetic material inlays situated in register with said pole pieces and that are not in contact with said corrosive atmosphere, said hermetically sealed enclosure being constituted externally solely by parts made of non-magnetic material that are secured to one another by welds that have not been subjected to any heat treatment.
H02K 5/128 - Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
H02K 7/09 - Structural association with bearings with magnetic bearings
90.
Corrosion-resistant jacketed active magnetic bearing
In a jacketed active magnetic bearing for a rotary machine having a rotor in contact with a process gas, there is provided a magnetic bearing comprising a bearing armature of laminated magnetic material secured to said rotor, a bearing stator protected by a first jacket of magnetic anti-corrosion material that co-operates with first housing portions to form a first leaktight housing enclosing the bearing stator, the first jacket being made of a ferritic stainless steel, and the first housing portions having insert parts that are also made of ferritic stainless steel, and that are connected by welds to a housing end-wall portion made of a magnetic anti-corrosion material, the laminated magnetic material forming the bearing armature and the detector armature also being a ferritic stainless steel.
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
H02K 5/12 - Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
H02K 5/10 - Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. of water or fingers
91.
A CORROSION-RESISTANT JACKETED ACTIVE MAGNETIC BEARING
In a jacketed active magnetic bearing for a rotary machine having a rotor (30) in contact with a process gas, there is provided a magnetic bearing comprising a bearing armature (31) of laminated magnetic material secured to said rotor, a bearing stator (41) made up of electromagnet windings (42) associated with a yoke (43) of laminated magnetic material, the bearing stator being protected by a first jacket (34) of magnetic anti--corrosion material that co-operates with first housing portions to form a first leaktight housing (40) enclosing the bearing stator, the first jacket being made of a ferritic stainless steel, and the first housing portions having insert parts (38A, 39A; 38B, 39B) that are also made of ferritic stainless steel, and that are connected by welds (36A, 36B; 37A, 37B), before said electromagnet windings and said bearing stator yoke are put into place, to a housing end-wall portion (44) made of a magnetic anti-corrosion material, the laminated magnetic material forming the bearing armature and the detector armature also being a ferritic stainless steel.
A device for detecting the axial position of a rotary shaft of a rotary machine comprises a target of ferromagnetic material placed at the end of the rotary shaft, an induction coil associated with a stationary magnetic circuit and placed facing the target while leaving an airgap, and a power supply circuit. The power supply circuit comprises an AC voltage source connected between a first end of the induction coil and a zone situated at a reference voltage, at least one capacitor connected between the ends of the induction coil, and a detector device interposed between a second end of the induction coil and the zone situated at the reference voltage, in order to deliver on a line information about the magnitude of the current flowing between the second end and the zone situated at the reference voltage.
F04D 29/00 - Details, component parts, or accessories
G01B 7/30 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapersMeasuring arrangements characterised by the use of electric or magnetic techniques for testing the alignment of axes
G01D 5/20 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
F04D 27/00 - Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
A device for detecting the axial position of a rotary shaft (10) of a rotary machine, the device comprising a target (12) of ferromagnetic material placed at the end of the rotary shaft, an induction coil (31) associated with a stationary magnetic circuit (32) secured to a structure of the rotary machine and placed facing the target while leaving an airgap (60), and a power supply circuit for powering the induction coil, in which device the power supply circuit comprises an AC voltage source (1) connected between a first end (7) of the induction coil and a zone (6) situated at a reference voltage (0 V), at least one capacitor (2) connected between said first end of the induction coil and a second end (8) of the induction coil, and a detector device (4) interposed between the second end and the zone situated at the reference voltage (0 V), in order to deliver on a line (5) information (i L) about the magnitude of the current flowing between said second end and said zone situated at the reference voltage (0 V), the information (i L) representing the value of a modification x to the width of the airgap that presents a predetermined nominal value e0.
F04D 19/04 - Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
G01D 5/20 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
94.
Electrical appliance with leaktight connections, and a method of fabrication
An electrical connection is provided for an environment that is subjected to corrosive gases or liquids. An outer insulating layer is formed on each of at least two conductors and made up of a fluorinated polymer that is meltable at a temperature situated between the temperature of the environment and a predetermined higher temperature. A heat-shrink sleeve surrounds the conductors and is made up of an outer layer of heat-shrink polymer and an inner layer of the fluorinated polymer that is meltable at a temperature situated between the temperature of the environment and the predetermined higher temperature. A weld is formed by melting the outer insulating layers of the conductors and the inner layer of the heat-shrink sleeve by heating to a temperature higher than the temperature of the environment and lower than the predetermined higher temperature, thereby making a weld that is continuous and leaktight, and of controlled thickness.
H01R 4/72 - Insulation of connections using a heat shrinking insulating sleeve
H01R 13/53 - Bases or cases for heavy dutyBases or cases with means for preventing corona or arcing
F16C 32/04 - Bearings not otherwise provided for using magnetic or electric supporting means
H01B 3/42 - Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes polyesters, polyethers, polyacetal
H01B 3/44 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances plasticsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes vinyl resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances plasticsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes acrylic resins
95.
Axially-adjustable magnetic bearing and a method of mounting it
The axially adjustable magnetic bearing comprises an annular body secured to a support, a magnetic bearing stator structure having an annular sheath for supporting electromagnet windings placed concentrically relative to said body, and an annular rotor armature placed concentrically relative to the stator structure, leaving an airgap relative thereto. The annular body includes at least one radial slot associated with clamping means, and includes a set-back portion in its face facing towards the stator structure. The face of the annular body facing towards the stator structure includes a sliding surface that co-operates with a facing portion of said sheath, and the set-back portion of the annular body presents a threaded portion that co-operates with a threaded portion of an adjustment ring engaged in an annular groove formed in the face of the sheath that faces towards the body. The adjustment ring is prevented from moving in the axial direction in said annular groove.
An electrical connection making it possible to achieve leaktight electrical linking in an environment that is subjected to corrosive gases or liquids, the connection being characterized in that it comprises: .cndot. at least two conductors (10A, 10B) for forming said electrical connection between each other or with a connector element (12); .cndot. an outer insulating layer formed on each of said conductors and made up of a fluorinated polymer that is meltable at a temperature situated between the temperature of said environment and a predetermined higher temperature; .cndot. a heat-shrink sleeve (18) surrounding said conductors and made up of an outer layer of heat-shrink polymer (18B) and an inner layer of said fluorinated polymer (18A) that is meltable at a temperature situated between the temperature of said environment and said predetermined higher temperature; melting said outer insulating layers of said conductors and said inner layer of said heat-shrink sleeve by heating to a temperature higher than said temperature of said environment and lower than said predetermined higher temperature, thereby making a weld (20) that is continuous and leaktight, and of controlled thickness.
H01B 3/44 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances plasticsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes vinyl resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances plasticsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes acrylic resins
H01R 13/405 - Securing in non-demountable manner, e.g. moulding, riveting
H01R 13/52 - Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
97.
Pressurized rotary machine with hermetically sealed connections
Pressurized rotary machine comprising a canned or sleeved assembly of which the electrical connections are connected to the outside of the machine by an electric supply duct, the electrical connections passing from the canned or sleeved assembly to the outside via the electric supply duct by passing in succession through first, second and third hermetically sealed bushings, none of these hermetically sealed bushings through which the electrical connections pass being exposed to a pressurized gas.
A rotary electric machine having at least one piece of electric equipment constituted by an overmolded or jacketed electric motor or by an overmolded or jacketed magnetic suspension system; the electric equipment including firstly a rotor (102) and secondly a stator (150) having pole pieces (154) and coils (152); the stator (150) being provided with at least one jacket (101) or coating (190) to protect it against an aggressive environment, on its face situated facing the rotor (102); the protective jacket (101) or coating (190) on the face of the stator (150) facing the rotor (102) presenting set-back portions (111) set back from the main surfaces (155) defining the airgap (e), these set-back portions (111) being distributed around the stator; and the movement of fluid circulating in the airgap around the rotor (102) being thus enhanced.
The invention relates to a jacketed axial magnetic bearing for a rotary machine having a rotor in contact with a gaseous atmosphere that is corrosive, acid, or carrying particles, the bearing comprising a rotor armature in the form of a disk secured to the rotor and placed in the gaseous atmosphere, and a stator magnetic circuit secured to a stationary support device and placed facing the rotor armature, the magnetic circuit of the stator comprising at least one coil and a ferromagnetic body placed in a metallic protective enclosure. The protective enclosure comprises firstly an annular support of channel section with a web and inner and outer flanges presenting a thickness of several millimeters and a length that is less than the length of the stator magnetic circuit, and secondly an annular jacket in the form of a channel-section cover machined from a solid piece and thus without welds, the jacket having inner and outer flanges and a closure web presenting a thickness smaller than the thicknesses of the inner and outer flanges, the free ends of the inner and outer flanges of the jacket being welded to the free ends of the inner and outer flanges of the annular support.
