A switched reluctance motor system includes a switched reluctance motor, a rotor including a plurality of salient poles, a stator including a plurality of salient poles, coils of three phases wound around the salient poles of the stator, and an electronic control unit. The electronic control unit is configured to drive the switched reluctance motor in a pole configuration pattern of NSNSNS in which the salient poles of the stator that have different polarities are alternately arranged. The electronic control unit is configured to perform current waveform control when an excitation sound frequency of a given order coincides with a resonance frequency of the switched reluctance motor.

A switched reluctance motor system includes a switched reluctance motor, a rotor including a plurality of salient poles, a stator including a plurality of salient poles, coils of three phases wound around the salient poles of the stator, and an electronic control unit. The electronic control unit is configured to drive the switched reluctance motor in a pole configuration pattern of NSNSNS in which the salient poles of the stator that have different polarities are alternately arranged. The electronic control unit is configured to perform current waveform control when an excitation sound frequency of a given order coincides with a resonance frequency of the switched reluctance motor.

Apparatus and methods are provided for operating an electric motor, comprising selectively energizing the coils of a stator having a plurality of stator teeth, each stator tooth having a said coil mounted thereon. The stator coils of a subset of the stator teeth are energized during a given time period to attract a corresponding rotor tooth into alignment with each of the stator teeth in the subset over the given time period. The stator coil of at least one stator tooth in the subset is energized during a portion of the given time period before the at least one stator tooth overlaps the corresponding rotor tooth.

Apparatus and methods are provided for operating an electric motor, comprising selectively energizing the coils of a stator having a plurality of stator teeth, each stator tooth having a said coil mounted thereon. The stator coils of a subset of the stator teeth are energized during a given time period to attract a corresponding rotor tooth into alignment with each of the stator teeth in the subset over the given time period. The stator coil of at least one stator tooth in the subset is energized during a portion of the given time period before the at least one stator tooth overlaps the corresponding rotor tooth.

A controller for a switched reluctance motor is provided. The switched reluctance motor includes a rotor, a stator, and a coil wound on the stator. The switched reluctance motor is mounted on a vehicle as a drive source for propelling the vehicle. The controller includes an electronic control unit. The electronic control unit is configured to execute first control for exciting the coil at a first current value in a first exciting range. The electronic control unit is configured to, when the electronic control unit determines that the vehicle is not able to start moving even when the electronic control unit executes the first control, execute second control for exciting the coil at a second current value larger than the first current value in a second exciting range narrower than the first exciting range.

A controller for a switched reluctance motor is provided. The switched reluctance motor includes a rotor, a stator, and a coil wound on the stator. The switched reluctance motor is mounted on a vehicle as a drive source for propelling the vehicle. The controller includes an electronic control unit. The electronic control unit is configured to execute first control for exciting the coil at a first current value in a first exciting range. The electronic control unit is configured to, when the electronic control unit determines that the vehicle is not able to start moving even when the electronic control unit executes the first control, execute second control for exciting the coil at a second current value larger than the first current value in a second exciting range narrower than the first exciting range.

A controller of an oil pressure control system for an automatic transmission, the system including: a manual valve having a sleeve and a spool and changing an oil passage to the automatic transmission; a detent lever having engagement grooves and positioning the spool; an engagement member including an engagement unit for the grooves and a bias unit biasing the engagement unit; and a motor rotating the detent lever, comprises: a shift range detecting unit; a range switch determining unit determining whether the shift range is switched; a temperature detecting unit; a temperature determining unit determining whether environmental temperature is lower than a predetermined temperature; and a power controlling unit supplying, to the motor, power for setting a maximum value of a rotary torque of rotating the detent lever to be a predetermined value when the shift range is switched and the environmental temperature is lower than the predetermined temperature.

A controller of an oil pressure control system for an automatic transmission, the system including: a manual valve having a sleeve and a spool and changing an oil passage to the automatic transmission; a detent lever having engagement grooves and positioning the spool; an engagement member including an engagement unit for the grooves and a bias unit biasing the engagement unit; and a motor rotating the detent lever, comprises: a shift range detecting unit; a range switch determining unit determining whether the shift range is switched; a temperature detecting unit; a temperature determining unit determining whether environmental temperature is lower than a predetermined temperature; and a power controlling unit supplying, to the motor, power for setting a maximum value of a rotary torque of rotating the detent lever to be a predetermined value when the shift range is switched and the environmental temperature is lower than the predetermined temperature.

Apparatus and methods of operating an electric motor are provided, comprising energizing a plurality of stator coils in sequence to rotate a rotor. Each said coil is energized with a repeating pulse sequence comprising at least a first portion and a second portion, the first and second portions repeating alternately to form the repeating pulse sequence. The first portion comprises a first pattern of pulses, each pulse in the first pattern having either a first polarity or second polarity, and at least two consecutive pulses in the first pattern having the same polarity. The second portion comprises a second pattern of pulses, the second pattern of pulses having the same pattern as said first pattern of pulses, but having inverted polarity with respect to said first pattern of pulses.

Apparatus and methods of operating an electric motor are provided, comprising energizing a plurality of stator coils in sequence to rotate a rotor. Each said coil is energized with a repeating pulse sequence comprising at least a first portion and a second portion, the first and second portions repeating alternately to form the repeating pulse sequence. The first portion comprises a first pattern of pulses, each pulse in the first pattern having either a first polarity or second polarity, and at least two consecutive pulses in the first pattern having the same polarity. The second portion comprises a second pattern of pulses, the second pattern of pulses having the same pattern as said first pattern of pulses, but having inverted polarity with respect to said first pattern of pulses.