Patent ID: 7923959

Claim:
A rotor driving control device, comprising: a motor; a transfer mechanism for transferring a turning force of the motor; a rotor to be rotated and driven by the turning force of the motor, and connected to the transfer mechanism; a plurality of detected portions circularly disposed around a rotation axis of the rotor; a detector to detect the detected portions; a passage time detecting device configured to detect passage times that a first zone and a second zone pass the detector, based on a signal from the detector at the time of rotating the rotor, when the first zone having two detected portions of the plurality of detected portions on the both ends is set, and the second zone having the detected portions on the both ends and at least one end being different from the detected portion of the first zone is set; an amplitude and phase generating device configured to generate an amplitude and a phase of a rotation period fluctuation regarding a desired period of the rotor based on the passage times detected by the passage time detecting device; and a rotation control device configured to control the rotation of the motor to decrease the rotation period fluctuation based on the amplitude and the phase generated by the amplitude and phase generating device.