Motor control apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorYUSUKE ISOMI
Life of this patent
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Abstract
A motor control apparatus detects currents flowing through coils of respective phases in a motor, estimates a rotational position of a rotor of the motor based on current values of the detected currents, and determines, in motor control that switches an excitation phase of the motor in accordance with a target rotational speed of the rotor, a current command value for a current component that generates torque in the rotor, based on a phase difference between a command value and an estimated value for the rotational position. The motor control apparatus controls currents supplied to the coils of the respective phases in the motor in accordance with the determined current command value determined by the determining unit.
Claims20
A motor control apparatus that controls a motor, comprising:
- a detection unit configured to detect currents flowing through coils of respective phases in the motor;
- an estimation unit configured to estimate a rotational position of a rotor of the motor based on current values of the currents detected by the detection unit;
- a determining unit configured to, in motor control that switches an excitation phase of the motor in accordance with a target rotational speed of the rotor, determine a current command value for a current component that generates torque in the rotor, based on a phase difference between a command value for the rotational position and an estimated value for the rotational position obtained by the estimation unit;
- and
- a control unit configured to control currents supplied to the coils of the respective phases in the motor in accordance with the current command value determined by the determining unit.
An image forming apparatus that forms an image on a recording material, comprising:
- a motor configured to drive a load;
- and
- a motor control apparatus configured to control the motor,
- wherein the motor control apparatus comprises:
- a detection unit configured to detect currents flowing through coils of respective phases in the motor;
- an estimation unit configured to estimate a rotational position of a rotor of the motor based on current values of the currents detected by the detection unit;
- a determining unit configured to, in motor control that switches an excitation phase of the motor in accordance with a target rotational speed of the rotor, determine a current command value for a current component that generates torque in the rotor, based on a phase difference between a command value for the rotational position and an estimated value for the rotational position obtained by the estimation unit;
- and
- a control unit configured to control currents supplied to the coils of the respective phases in the motor in accordance with the current command value determined by the determining unit.
Dependencies are inferred from the claim text.