A linear motor is disclosed, the linear motor comprising a longitudinal coil assembly comprising coil units arranged in a cascading manner and a magnet track spaced from the coil assembly, and adapted to move along a path which traces a periphery of the coil assembly. The linear motor further comprises sensors, each sensor being associated with a subset of the coil units, and adapted to send a first sensor signal in response to detecting the magnet track. The linear motor further comprises a control unit, wherein the control unit is configured to receive the first sensor signal, identify the sensor which sent the first sensor signal, and power up the subset of the coil units associated with the sensor.

A linear motor is disclosed, the linear motor comprising a longitudinal coil assembly comprising coil units arranged in a cascading manner and a magnet track spaced from the coil assembly, and adapted to move along a path which traces a periphery of the coil assembly. The linear motor further comprises sensors, each sensor being associated with a subset of the coil units, and adapted to send a first sensor signal in response to detecting the magnet track. The linear motor further comprises a control unit, wherein the control unit is configured to receive the first sensor signal, identify the sensor which sent the first sensor signal, and power up the subset of the coil units associated with the sensor.

A control apparatus of a rotary electric machine includes a rotor; a stator including a multiphase stator winding provided with conductor portions arranged in a circumferential direction thereof. The rotary electric machine is configured of any one of a first configuration having a first inter-conductor member using a magnetic material; a second configuration having a second inter-conductor member using a non-magnetic material; and a third configuration having no inter-conductor member. The control apparatus includes: a drive circuit with switching elements provided for each phase, supplying power to the multiphase stator winding; and a control unit controlling the drive circuit such that a period where a conduction ratio of the switching elements for one phase in the drive circuit is maintained at a constant value is more than or equal to 120 degrees and less than 180 degrees in electrical angle.

A control apparatus of a rotary electric machine includes a rotor; a stator including a multiphase stator winding provided with conductor portions arranged in a circumferential direction thereof. The rotary electric machine is configured of any one of a first configuration having a first inter-conductor member using a magnetic material; a second configuration having a second inter-conductor member using a non-magnetic material; and a third configuration having no inter-conductor member. The control apparatus includes: a drive circuit with switching elements provided for each phase, supplying power to the multiphase stator winding; and a control unit controlling the drive circuit such that a period where a conduction ratio of the switching elements for one phase in the drive circuit is maintained at a constant value is more than or equal to 120 degrees and less than 180 degrees in electrical angle.

A controller for a rotary electric machine may include: at least one memory that stores a temperature prediction data in which a relationship among a rotational speed of a rotary electric machine, a torque information of the rotary electric machine, a temperature of the rotary electric machine at a reference time point, and a temperature of the rotary electric machine after an estimation calculation period elapses from the reference time point, and at least one processor that, at every estimation calculation period, sets the last calculation time before the estimation calculation period as the reference time point, and, by referring to the temperature prediction data, calculates an estimation value of temperature of the rotary electric machine after the estimation calculation period elapses from the last calculation time.

A controller for a rotary electric machine may include: at least one memory that stores a temperature prediction data in which a relationship among a rotational speed of a rotary electric machine, a torque information of the rotary electric machine, a temperature of the rotary electric machine at a reference time point, and a temperature of the rotary electric machine after an estimation calculation period elapses from the reference time point, and at least one processor that, at every estimation calculation period, sets the last calculation time before the estimation calculation period as the reference time point, and, by referring to the temperature prediction data, calculates an estimation value of temperature of the rotary electric machine after the estimation calculation period elapses from the last calculation time.

A rotating machine control device for controlling a rotating machine having a stator winding and a field winding includes a current command generation unit which generates a current command value on the basis of the temperature of the rotating machine. The current command generation unit includes a constraint condition setting unit which calculates a constraint condition on the basis of a torque command, stator winding voltage, stator winding current, and field winding current, an optimization calculation unit which calculates and outputs the current command value, using the constraint condition and an evaluation function, and a constraint condition update unit which updates the constraint condition on the basis of the temperature of the rotating machine. The current command generation unit calculates and outputs the current command value, using the updated constraint condition.

A rotating machine control device for controlling a rotating machine having a stator winding and a field winding includes a current command generation unit which generates a current command value on the basis of the temperature of the rotating machine. The current command generation unit includes a constraint condition setting unit which calculates a constraint condition on the basis of a torque command, stator winding voltage, stator winding current, and field winding current, an optimization calculation unit which calculates and outputs the current command value, using the constraint condition and an evaluation function, and a constraint condition update unit which updates the constraint condition on the basis of the temperature of the rotating machine. The current command generation unit calculates and outputs the current command value, using the updated constraint condition.

A method of cooling a motor coupled to a compressor of a chiller includes adjusting a position of a motor cooling valve located fluidly between the motor and a refrigerant source, using a motor temperature control system coupled to the motor cooling valve to regulate an amount of refrigerant introduced into the motor from the condenser according to a temperature control scheme performed as a function of a monitored temperature in the motor, a first temperature threshold, and a second temperature threshold lower than the first temperature threshold. The temperature control scheme includes a motor cooling control process that adjusts the position of the motor cooling valve based on a stator winding temperature set point relating to stator windings of the motor. A proportionally limited close command override associated with a first temperature range above the second temperature threshold proportionally limits a close command provided to the motor cooling valve.

A method of cooling a motor coupled to a compressor of a chiller includes adjusting a position of a motor cooling valve located fluidly between the motor and a refrigerant source, using a motor temperature control system coupled to the motor cooling valve to regulate an amount of refrigerant introduced into the motor from the condenser according to a temperature control scheme performed as a function of a monitored temperature in the motor, a first temperature threshold, and a second temperature threshold lower than the first temperature threshold. The temperature control scheme includes a motor cooling control process that adjusts the position of the motor cooling valve based on a stator winding temperature set point relating to stator windings of the motor. A proportionally limited close command override associated with a first temperature range above the second temperature threshold proportionally limits a close command provided to the motor cooling valve.