Motor drive control device
AssigneeMinebea Co., Ltd.
InventorHiroyuki Kaidu
Life of this patent
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Abstract
A motor drive control device, which drives a motor including a plurality of phase coils and a rotor, includes: a motor driver, which outputs a drive signal to the phase coils on a drive control signal; one position sensor, which is provided in a position where a timing of at least one of a rising edge and a falling edge of a rotor position signal is near a zero cross timing of a phase signal of any phase coil; and a controller that: generates the drive control signal based on the phase signal in a case where a rotational speed of the motor is less than a predetermined rotational speed; and generates the drive control signal based on the rotor position signal output from the one position sensor in a case where the rotational speed is equal to or more than the predetermined rotational speed.
Claims5
A motor drive control device that drives a motor including a plurality of phase coils and a rotor rotatably supported with respect to the plurality of phase coils, the motor drive control device comprising:
- a motor driver, which outputs a drive signal to each of the phase coils of the motor based on a drive control signal;
- one position sensor, which is provided in a position where a timing of at least one of a rising edge and a falling edge of a rotor position signal is near a zero cross timing of a phase signal of any phase coil;
- and
- a controller that:
- generates the drive control signal based on the phase signal of the any phase coil in a case where a rotational speed of the motor is less than a predetermined rotational speed;
- generates the drive control signal based on the rotor position signal output from the one position sensor in a case where the rotational speed is equal to or more than the predetermined rotational speed;
- and
- wherein the controller includes a rotational speed determination unit, wherein the rotational speed determination unit:
- obtains an actual number of revolutions of the motor based on the phase signal of the each phase coil;
- and
- calculates the predetermined rotational speed from a comparison result between a predetermined number of revolutions, at which switching from the phase signal to the rotor position signal is performed, and the actual number of revolutions.
A motor drive control device that drives a motor including a plurality of phase coils and a rotor rotatably supported with respect to the plurality of phase coils, the motor drive control device comprising:
- a motor driver, which outputs a drive signal to each of the phase coils of the motor based on a drive control signal;
- one position sensor, which is provided in a position where a timing of at least one of a rising edge and a falling edge of a rotor position signal is near a zero cross timing of a phase signal of any phase coil;
- and
- a controller that:
- generates the drive control signal based on the phase signal of the any phase coil in a case where a rotational speed of the motor is less than a predetermined rotational speed;
- generates the drive control signal based on the rotor position signal output from the one position sensor in a case where the rotational speed is equal to or more than the predetermined rotational speed;
- and
- wherein the controller includes a rotational speed determination unit, wherein the rotational speed determination unit obtains the predetermined rotational speed from a relation between the rotor position signal and the phase signal of the each phase coil.
Dependencies are inferred from the claim text.