Patent ID: 8659259

Claim:
A motor driving apparatus that conducts constant-current control on an electric current that flows through a coil of a motor, the motor driving apparatus comprising: a detection portion that detects the electric current that flows through the coil; and a control portion that conducts control every first cycle so as to feed the electric current to the coil until a value of the detected electric current reaches a target value, to perform a first decay process, which decays the electric current that flows through the coil, after the value of the detected electric current reaches the target value, by a first decay mode in a second cycle shorter than the first cycle, and to perform a second decay process, which decays the electric current that flows through the coil, after the first decay process, by the first or a second decay mode every second cycle, wherein a decay rate in the first decay mode is higher than a decay rate in the second decay mode, and wherein in the second decay process, the control portion decays the electric current that flows through the coil in the first decay mode when the value of the electric current detected by the detection portion is equal to or higher than a predetermined threshold, with the predetermined threshold being lower than the target value, and decays the electric current that flows through the coil in the second decay mode when the value of the electric current detected by the detection portion is lower than the predetermined threshold.