Patent ID: 11966184
Assignee: CANON KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 3:
4. The image forming apparatus according to claim 3, further comprising:
a detector configured to detect the current flowing through the coil; and
a phase determiner configured to determine a rotational phase of the rotor being rotated based on the current detected by the detector,
wherein the controller switches a control mode for driving the motor from the first control mode to a second control mode after driving of the motor is started in the first control mode, and
wherein in the second control mode, the controller controls the current supplied to the coil based on a torque current component and an excitation current component, the torque current component being a current component that is represented in a rotating coordinate system based on the rotational phase determined by the phase determiner and generates a torque in the rotor, the excitation current component being a current component that is represented in the rotating coordinate system and influences a strength of a magnetic flux passing through the coil.