A permanent-magnet three-phase duplex motor is provided with two systems, namely a system that includes a first three-phase winding and a first inverter circuit, and a system that includes a second three-phase winding and a second inverter circuit, and a controlling apparatus is configured such that when one system fails, the controlling apparatus stops operation of the inverter circuit of the failed system, and controls operation of the inverter circuit of the normal system to increase the driving current that is supplied from the inverter circuit of the normal system, and the first three-phase winding and the second three-phase winding are configured such that magnetic fields that act on the permanent magnets in a demagnetizing direction when the increased driving current is supplied from the inverter circuit of the normal system are equal to magnetic fields that normally act on the permanent magnets in the demagnetizing direction.

Methods and systems for operating a hybrid electric aircraft propulsion system. The method comprises providing alternating current (AC) electric power to a first electric motor to drive a first rotating propulsor, providing the first electric motor with AC electric power from at least one motor inverter operatively coupled to a direct current (DC) power source, detecting a failure in a path to the first electric motor, and selectively rearranging a first switching arrangement between the generator, the at least one motor inverter, and the first electric motor.

Systems and methods are provided for braking a translator of a linear multiphase electromagnetic machine. The system detects a fault event, and in response to detecting the fault event, causes the translator to brake using an electromagnetic technique. Braking includes causing the translator to stop reciprocating, by applying a force opposing an axial motion, which may occur within one cycle, or over many cycles. The fault event may include, for example, a fault associated with an encoder, a controller, an electrical component, a communications link, a phase, or a subsystem. The system includes a power electronics system configured to apply current to the phases. The system may use position information, current information, operating parameters, or a combination thereof to brake. Alternatively, the system need not use position information, current information, and operating parameters, and may brake the translator independent of such information.

A cycloidal reluctance machine includes a stator surrounding a rotor. Stator windings and rotor windings form respective concentric rotor and stator electromagnets. The rotor is eccentrically positioned with respect to the stator to move with two degrees of freedom (2DOF), including rotating motion about a rotary axis of the rotor and orbiting motion about a center axis of the stator. A rotor constraint mechanism (RCM) constrains motion of the rotor, such that the rotor is able to generate and transmit output torque to a coupled load in at least one of the 2DOF. A magnetic field polarity of stator poles and/or rotor poles of the respective stator and rotor changes over one electrical cycle of the polyphase voltage. The coupled load may be a drive axle of a vehicle in some embodiments. In others, the stator and rotor windings are driven via different power inverters.

A cycloidal reluctance machine includes a stator surrounding a rotor. Stator windings and rotor windings form respective concentric rotor and stator electromagnets. The rotor is eccentrically positioned with respect to the stator to move with two degrees of freedom (2DOF), including rotating motion about a rotary axis of the rotor and orbiting motion about a center axis of the stator. A rotor constraint mechanism (RCM) constrains motion of the rotor, such that the rotor is able to generate and transmit output torque to a coupled load in at least one of the 2DOF. A magnetic field polarity of stator poles and/or rotor poles of the respective stator and rotor changes over one electrical cycle of the polyphase voltage. The coupled load may be a drive axle of a vehicle in some embodiments. In others, the stator and rotor windings are driven via different power inverters.

In an embodiment of the present disclosure, a heating, ventilation, air conditioning, and refrigeration (HVAC&R) system includes a refrigerant loop and a compressor disposed along the refrigerant loop. The compressor is configured to circulate refrigerant through the refrigerant loop. The HVAC&R system also includes a motor configured to drive the compressor and a variable speed drive (VSD) configured to supply power to the motor. The VSD further includes a first power pod configured to supply a first power to the motor and a second power pod configured to supply a second power to the motor.

Systems and methods are provided for braking a translator of a linear multiphase electromagnetic machine. The system detects a fault event, and in response to detecting the fault event, causes the translator to brake using an electromagnetic technique. Braking includes causing the translator to stop reciprocating, by applying a force opposing an axial motion, which may occur within one cycle, or over many cycles. The fault event may include, for example, a fault associated with an encoder, a controller, an electrical component, a communications link, a phase, or a subsystem. The system includes a power electronics system configured to apply current to the phases. The system may use position information, current information, operating parameters, or a combination thereof to brake. Alternatively, the system need not use position information, current information, and operating parameters, and may brake the translator independent of such information.

For starting an AC electric motor of a mining vehicle, it is first accelerated to a first speed with a second AC voltage provided by an onboard battery-powered inverter of the mining vehicle. A phase of a first AC voltage taken from an external grid is compared to a phase of said second AC voltage. If the phase difference between the first and second AC voltages is larger than a predetermined limit, the speed at which said inverter rotates said AC electric motor is changed. If the difference between the phases of the first and second AC voltages is smaller than the predetermined limit, a change is made from rotating the AC electric motor with the second AC voltage to rotating the AC electric motor with the first AC voltage.

A drive train, which is configured to electrically operate a vehicle, includes an electric motor and a first and second energy store, each of which is electrically connected to the electric motor. The drive train also includes a first inverter and a second inverter, where the first inverter is provided between the first energy store and the electric motor, and where the second inverter is provided between the second energy store and the electric motor. The electric motor has four phases.

There is provided a hybrid electric aircraft propulsion system and method for operating same. The method comprises providing, to a first electric motor and a second electric motor, alternating current (AC) electric power from a generator, the generator receiving rotational power from a thermal engine, providing, to the first electric motor and the second electric motor, AC electric power from at least one motor inverter, the at least one motor inverter configured to convert DC electric power from a DC power source into AC electric power, and selectively driving the first and second electric motors from the generator, the at least one motor inverter, or a combination thereof, wherein the first electric motor drives a first rotating propulsor and the second electric motor drives a second rotating propulsor.