An electric machine has a housing which has an interior space and an interior wall extending about the interior space, and a stator assembly disposed within the interior space and attached to the interior wall. The electric machine includes a rotor within the interior space and located radially inward from the stator. The rotor and stator define a gap there between and cooperate to produce flux. The rotor comprises a hollow cylindrical member having an interior region, an interior wall extending about the interior region and an exterior surface. The rotor includes magnets attached to the exterior surface and a rotor shaft support structure disposed within the interior region of the hollow cylindrical member and attached to the interior wall of the hollow cylindrical member. A rotor shaft is attached to the rotor shaft support structure. The electric machine further comprises bearings to locate and support the rotor shaft relative to the housing.
H02K 9/06 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
F28C 1/00 - Direct-contact trickle coolers, e.g. cooling towers
F28F 25/10 - Component parts of trickle coolers for feeding gas or vapour
H02K 1/32 - Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
H02K 3/30 - Windings characterised by the insulating material
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
H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
H02K 9/02 - Arrangements for cooling or ventilating by ambient air flowing through the machine
H02K 9/22 - Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
2.
DIRECT-DRIVE SYSTEM FOR COOLING SYSTEM FANS, EXHAUST BLOWERS AND PUMPS
The present invention is directed to a load bearing direct-drive system and a variable process control system for efficiently managing the operation of fans in a cooling system such as a wet-cooling tower, air-cooled heat exchanger (ACHE), HVAC system, blowers and centrifugal blowers, mechanical towers or chiller systems. In one embodiment, the load bearing direct-drive system comprises a load bearing torque multiplier device having an output rotatable shaft connected to a fan, and a load bearing motor comprising a rotatable shaft that drives the load bearing torque multiplier device.
A motor has a housing which comprises a cavity and a socket accessible from outside the housing. The socket has an interior surface. The motor includes a LRU sensor system which comprises an LRU sensor having electrical conductors and internal sensor wiring that is electrically connected to the electrical conductors and electrical conductors on the interior surface of the socket, wherein when the LRU sensor is positioned in the socket, the electrical conductors on the LRU sensor contact the electrical conductors on the interior surface of the socket.
H02K 11/20 - Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
The present invention is directed to a cooling tower comprising a cooling tower structure comprising fill material supported by the cooling tower structure and configured to receive heated process fluid and a motor mounted to the cooling tower structure. The motor comprises a casing and a rotatable shaft and is sealed to prevent fluids, moisture, foreign particles and contaminants from entering the casing. A fan is connected to the rotatable shaft of the motor. Rotation of the rotatable shaft rotates the fan thereby inducing an upward moving mass flow of cool air through the fill material. A basin is attached to the cooling tower structure for collecting cooled fluid. A fluid distribution system distributes the cooled fluid in the basin. The fluid distribution system comprises a pumping device to pump cooled fluid from the basin, fluid piping to receive the pumped cooled fluid and fluid spray devices fluidly connected to the fluid piping for spraying fluid on the casing of the motor so as to transfer heat of the casing to the fluid.
H02K 9/06 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
H02K 9/02 - Arrangements for cooling or ventilating by ambient air flowing through the machine
H02K 9/22 - Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
H02K 1/32 - Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
F28C 1/00 - Direct-contact trickle coolers, e.g. cooling towers
F28F 25/10 - Component parts of trickle coolers for feeding gas or vapour
H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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
A direct drive batch mixing system including a vessel having an interior region for receiving a batch, a direct drive electric motor attached to at least one rigid point, a multi-axis load cell located between the motor and the rigid point to provide signals representing forces and moments in multiple axes, and an impeller located within the interior region of the vessel and engaged with the motor such that the motor rotates the impeller. Forces and loads on the impeller are directly supported by the motor and measured by the multi-axis load cell. In some embodiments, a programmable controller generates control signals that control the motor's speed (RPM), torque and direction of rotation, and receives feedback signals for adjusting the motor's speed and/or torque and/or direction of rotation.
B01F 35/222 - Control or regulation of the operation of the driving system, e.g. torque, speed or power of motorsControl or regulation of the position of mixing devices or elements
An electric machine has a housing which has an interior space and an interior wall extending about the interior space, and a stator assembly disposed within the interior space and attached to the interior wall. The electric machine includes a rotor within the interior space and located radially inward from the stator. The rotor and stator define a gap there between and cooperate to produce flux. The rotor comprises a hollow cylindrical member having an interior region, an interior wall extending about the interior region and an exterior surface. The rotor includes magnets attached to the exterior surface and a rotor shaft support structure disposed within the interior region of the hollow cylindrical member and attached to the interior wall of the hollow cylindrical member. A rotor shaft is attached to the rotor shaft support structure. The electric machine further comprises bearings to locate and support the rotor shaft relative to the housing.
F28F 25/10 - Component parts of trickle coolers for feeding gas or vapour
H02K 1/32 - Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
H02K 3/30 - Windings characterised by the insulating material
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
H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
H02K 9/02 - Arrangements for cooling or ventilating by ambient air flowing through the machine
H02K 9/04 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
H02K 9/06 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
H02K 9/22 - Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
The present invention provides techniques, schemes configurations and methods for removing or reducing heat in motors. In one embodiment, the present invention is directed to a cooling tower comprising a cooling tower structure and a motor supported by the cooling tower structure. The motor comprises a motor casing and a rotatable shaft. The cooling tower further comprises a cooling tower fan that comprises a fan hub, a plurality of fan blades attached to the rotatable shaft and a supplemental fan attached to the fan hub such that the supplemental fan is between the fan hub and the motor. Rotation of the cooling tower fan causes rotation of the supplemental fan which increases airflow around the casing of the motor so as to facilitate cooling of the motor. Other embodiments of configurations, schemes, method and techniques for thermally managing motors are described herein in detail.
H02K 9/06 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
H02K 9/02 - Arrangements for cooling or ventilating by ambient air flowing through the machine
H02K 1/32 - Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
H02K 9/22 - Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
F28C 1/00 - Direct-contact trickle coolers, e.g. cooling towers
F28F 25/10 - Component parts of trickle coolers for feeding gas or vapour
H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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
8.
Direct-drive system for cooling system fans, exhaust blowers and pumps
The present invention is directed to a load bearing direct-drive system and a variable process control system for efficiently managing the operation of fans in a cooling system such as a wet-cooling tower, air-cooled heat exchanger (ACHE), HVAC system, blowers and centrifugal blowers, mechanical towers or chiller systems. In one embodiment, the load bearing direct-drive system comprises a load bearing torque multiplier device having an output rotatable shaft connected to a fan, and a load bearing motor comprising a rotatable shaft that drives the load bearing torque multiplier device.
A motor has a housing which comprises a cavity and a socket accessible from outside the housing. The socket has an interior surface. The motor includes a LRU sensor system which comprises an LRU sensor having electrical conductors and internal sensor wiring that is electrically connected to the electrical conductors and electrical conductors on the interior surface of the socket, wherein when the LRU sensor is positioned in the socket, the electrical conductors on the LRU sensor contact the electrical conductors on the interior surface of the socket.
H02K 11/20 - Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
The present invention is directed to a load bearing direct-drive system for driving a fan in a cooling system such as a wet-cooling tower, air-cooled heat exchanger, HVAC system, hybrid cooling tower, mechanical tower or chiller system. The present invention includes a variable process control system that is based on the integration of key features and characteristics such as tower thermal performance, fan speed and airflow, motor torque, fan pitch, fan speed, fan aerodynamic properties, and pump flow. The variable process control system processes feedback signals from multiple locations in order to control a high torque, low variable speed, load bearing motor to drive the fan.
The present invention is directed to a cooling tower that has a cooling tower structure having fill material supported by the cooling tower structure and configured to receive heated process fluid and a motor mounted to the cooling tower structure. The motor has a casing and a rotatable shaft and is sealed to prevent fluids, moisture, foreign particles and contaminants from entering the casing. A fan is connected to the rotatable shaft of the motor. Rotation of the rotatable shaft rotates the fan thereby inducing an upward moving mass flow of cool air through the fill material. A basin is attached to the cooling tower structure for collecting cooled fluid. A fluid distribution system distributes the cooled fluid in the basin. The fluid distribution system has a pumping device to pump cooled fluid from the basin, fluid piping to receive the pumped cooled fluid and fluid spray devices fluidly connected to the fluid piping for spraying fluid on the casing of the motor so as to transfer heat of the casing to the fluid.
H02K 9/06 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
H02K 9/02 - Arrangements for cooling or ventilating by ambient air flowing through the machine
H02K 1/32 - Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
H02K 9/22 - Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
F28C 1/00 - Direct-contact trickle coolers, e.g. cooling towers
F28F 25/10 - Component parts of trickle coolers for feeding gas or vapour
H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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
The present invention provides techniques, schemes configurations and methods for removing or reducing heat in motors. In one embodiment, the present invention is directed to a cooling tower having a cooling tower structure and a motor supported by the cooling tower structure. The motor has a motor casing and a rotatable shaft. The cooling tower further has a cooling tower fan that has a fan hub, a plurality of fan blades attached to the rotatable shaft and a supplemental fan attached to the fan hub such that the supplemental fan is between the fan hub and the motor. Rotation of the cooling tower fan causes rotation of the supplemental fan which increases airflow around the casing of the motor so as to facilitate cooling of the motor. Other embodiments of configurations, schemes, method and techniques for thermally managing motors are described herein in detail.
H02K 9/06 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
H02K 9/02 - Arrangements for cooling or ventilating by ambient air flowing through the machine
H02K 1/32 - Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
H02K 9/22 - Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
F28C 1/00 - Direct-contact trickle coolers, e.g. cooling towers
F28F 25/10 - Component parts of trickle coolers for feeding gas or vapour
H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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
The present invention is directed to a load bearing direct-drive system and a variable process control system for efficiently managing the operation of fans in a cooling system such as a wet-cooling tower, air-cooled heat exchanger (ACHE), HVAC system, blowers and centrifugal blowers, mechanical towers or chiller systems. In one embodiment, the load bearing direct-drive system comprises a load bearing torque multiplier device having an output rotatable shaft connected to a fan, and a load bearing motor comprising a rotatable shaft that drives the load bearing torque multiplier device.
The present invention is directed to a cooling tower that has a cooling tower structure having fill material supported by the cooling tower structure and configured to receive heated process fluid and a motor mounted to the cooling tower structure. The motor has a casing and a rotatable shaft and is sealed to prevent fluids, moisture, foreign particles and contaminants from entering the casing. A fan is connected to the rotatable shaft of the motor. Rotation of the rotatable shaft rotates the fan thereby inducing an upward moving mass flow of cool air through the fill material. A basin is attached to the cooling tower structure for collecting cooled fluid. A fluid distribution system distributes the cooled fluid in the basin. The fluid distribution system has a pumping device to pump cooled fluid from the basin, fluid piping to receive the pumped cooled fluid and fluid spray devices fluidly connected to the fluid piping for spraying fluid on the casing of the motor so as to transfer heat of the casing to the fluid.
H02K 9/06 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
H02K 9/02 - Arrangements for cooling or ventilating by ambient air flowing through the machine
H02K 1/32 - Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
H02K 9/22 - Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
F28C 1/00 - Direct-contact trickle coolers, e.g. cooling towers
F28F 25/10 - Component parts of trickle coolers for feeding gas or vapour
H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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
A motor has a housing which comprises a cavity and a socket accessible from outside the housing. The socket has an interior surface. The motor includes a LRU sensor system which comprises an LRU sensor having electrical conductors and internal sensor wiring that is electrically connected to the electrical conductors and electrical conductors on the interior surface of the socket, wherein when the LRU sensor is positioned in the socket, the electrical conductors on the LRU sensor contact the electrical conductors on the interior surface of the socket.
H02K 11/20 - Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
H02K 5/22 - Auxiliary parts of casings not covered by groups , e.g. shaped to form connection boxes or terminal boxes
The present invention is directed to a load bearing direct-drive system for driving a fan in a cooling system such as a wet-cooling tower, air-cooled heat exchanger, HVAC system, hybrid cooling tower, mechanical tower or chiller system. The present invention includes a variable process control system that is based on the integration of key features and characteristics such as tower thermal performance, fan speed and airflow, motor torque, fan pitch, fan speed, fan aerodynamic properties, and pump flow. The variable process control system processes feedback signals from multiple locations in order to control a high torque, low variable speed, load bearing motor to drive the fan.
F28C 1/00 - Direct-contact trickle coolers, e.g. cooling towers
F28F 25/10 - Component parts of trickle coolers for feeding gas or vapour
F04D 29/00 - Details, component parts, or accessories
F04D 25/06 - Units comprising pumps and their driving means the pump being electrically driven
F28B 9/00 - Auxiliary systems, arrangements, or devices
F28B 1/06 - Condensers in which the steam or vapour is separated from the cooling medium by walls, e.g. surface condenser using air or other gas as the cooling medium
17.
Cooling schemes and methods for cooling tower motors
The present invention provides techniques, schemes configurations and methods for removing or reducing heat in motors. In one embodiment, the present invention is directed to a cooling tower comprising a cooling tower structure and a motor supported by the cooling tower structure. The motor comprises a motor casing and a rotatable shaft. The cooling tower further comprises a cooling tower fan that comprises a fan hub, a plurality of fan blades attached to the rotatable shaft and a supplemental fan attached to the fan hub such that the supplemental fan is between the fan hub and the motor. Rotation of the cooling tower fan causes rotation of the supplemental fan which increases airflow around the casing of the motor so as to facilitate cooling of the motor. Other embodiments of configurations, schemes, method and techniques for thermally managing motors are described herein in detail.
H02K 9/06 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
H02K 1/32 - Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
H02K 9/02 - Arrangements for cooling or ventilating by ambient air flowing through the machine
H02K 9/22 - Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
F28C 1/00 - Direct-contact trickle coolers, e.g. cooling towers
F28F 25/10 - Component parts of trickle coolers for feeding gas or vapour
H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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
The present invention is directed to a cooling tower that has a cooling tower structure having fill material supported by the cooling tower structure and configured to receive heated process fluid and a motor mounted to the cooling tower structure. The motor has a casing and a rotatable shaft and is sealed to prevent fluids, moisture, foreign particles and contaminants from entering the casing. A fan is connected to the rotatable shaft of the motor. Rotation of the rotatable shaft rotates the fan thereby inducing an upward moving mass flow of cool air through the fill material. A basin is attached to the cooling tower structure for collecting cooled fluid. A fluid distribution system distributes the cooled fluid in the basin. The fluid distribution system has a pumping device to pump cooled fluid from the basin, fluid piping to receive the pumped cooled fluid and fluid spray devices fluidly connected to the fluid piping for spraying fluid on the casing of the motor so as to transfer heat of the casing to the fluid.
H02K 9/06 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
H02K 1/32 - Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
H02K 9/02 - Arrangements for cooling or ventilating by ambient air flowing through the machine
H02K 9/22 - Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
F28C 1/00 - Direct-contact trickle coolers, e.g. cooling towers
F28F 25/10 - Component parts of trickle coolers for feeding gas or vapour
H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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
A motor has a housing which comprises a cavity and a socket accessible from outside the housing. The socket has an interior surface. The motor includes a LRU sensor system which comprises an LRU sensor having electrical conductors and internal sensor wiring that is electrically connected to the electrical conductors and electrical conductors on the interior surface of the socket, wherein when the LRU sensor is positioned in the socket, the electrical conductors on the LRU sensor contact the electrical conductors on the interior surface of the socket.
The present invention is directed to a load bearing direct-drive system for driving a fan in a cooling system such as a wet-cooling tower, air-cooled heat exchanger, HVAC system, hybrid cooling tower, mechanical tower or chiller system. The present invention includes a variable process control system that is based on the integration of key features and characteristics such as tower thermal performance, fan speed and airflow, motor torque, fan pitch, fan speed, fan aerodynamic properties, and pump flow. The variable process control system processes feedback signals from multiple locations in order to control a high torque, low variable speed, load bearing motor to drive the fan.
The present invention is directed to a load bearing direct-drive system and a variable process control system for efficiently managing the operation of fans in a cooling system such as a wet-cooling tower, air-cooled heat exchanger (ACHE), HVAC system, blowers and centrifugal blowers, mechanical towers or chiller systems. In one embodiment, the load bearing direct-drive system comprises a load bearing torque multiplier device having an output rotatable shaft connected to a fan, and a load bearing motor comprising a rotatable shaft that drives the load bearing torque multiplier device.
The present invention is directed to a cooling tower comprising a cooling tower structure comprising fill material supported by the cooling tower structure and configured to receive heated process fluid and a motor mounted to the cooling tower structure. The motor comprises a casing and a rotatable shaft and is sealed to prevent fluids, moisture, foreign particles and contaminants from entering the casing. A fan is connected to the rotatable shaft of the motor. Rotation of the rotatable shaft rotates the fan thereby inducing an upward moving mass flow of cool air through the fill material. A basin is attached to the cooling tower structure for collecting cooled fluid.
F25B 19/04 - Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour using fluid jet, e.g. of steam using liquid jet, e.g. of water
23.
POWER DENSE MOTOR WITH THERMAL MANAGEMENT CAPABILITY
An electric machine has a housing which has an interior space and an interior wall extending about the interior space, and a stator assembly disposed within the interior space and attached to the interior wall. The electric machine includes a rotor within the interior space and located radially inward from the stator. The rotor and stator define a gap there between and cooperate to produce flux. The rotor comprises a hollow cylindrical member having an interior region, an interior wall extending about the interior region and an exterior surface. The rotor includes magnets attached to the exterior surface and a rotor shaft support structure disposed within the interior region of the hollow cylindrical member and attached to the interior wall of the hollow cylindrical member. A rotor shaft is attached to the rotor shaft support structure. The electric machine further comprises bearings to locate and support the rotor shaft relative to the housing.
H02K 9/00 - Arrangements for cooling or ventilating
H02K 9/04 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
H02K 9/06 - Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
24.
COOLING SCHEMES AND METHODS FOR COOLING TOWER MOTORS
The present invention provides techniques, schemes configurations and methods for removing or reducing heat in motors. In one embodiment, the present invention is directed to a cooling tower comprising a cooling tower structure and a motor supported by the cooling tower structure. The motor comprises a motor casing and a rotatable shaft. The cooling tower further comprises a cooling tower fan that comprises a fan hub, a plurality of fan blades attached to the rotatable shaft and a supplemental fan attached to the fan hub such that the supplemental fan is between the fan hub and the motor. Rotation of the cooling tower fan causes rotation of the supplemental fan which increases airflow around the casing of the motor so as to facilitate cooling of the motor. Other embodiments of configurations, schemes, method and techniques for thermally managing motors are described herein in detail.
The present invention is directed to a load bearing direct-drive system and a variable process control system for efficiently managing the operation of fans in a cooling system such as a wet-cooling tower, air-cooled heat exchanger (ACHE), HVAC system, blowers and centrifugal blowers, mechanical towers or chiller systems. In one embodiment, the load bearing direct-drive system comprises a load bearing torque multiplier device having an output rotatable shaft connected to a fan, and a load bearing motor comprising a rotatable shaft that drives the load bearing torque multiplier device.
F28C 1/00 - Direct-contact trickle coolers, e.g. cooling towers
F28F 27/00 - Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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
patents
