Patent ID: 7157871
Filing Date: 2007-01-02
Classification: G11B

Abstract:
1. An intermittent drive control apparatus of a motor comprising: motor drive means capable of driving a motor intermittently by selectively supplying current of a forward rotation direction and current of a reverse rotation direction to the motor; rotation detection means which generate rotation detection signals at a frequency proportionate to rotation of the motor; and braking time calculation means which, when the motor drive means is controlled to supply the current of the forward rotation direction and the current of the reverse rotation direction to the motor, thereby braking and stopping the rotation of the motor, measures a period of the rotation detection signals to calculate a speed deceleration rate of the motor, and calculate a braking time between braking start and stop of the rotation of the motor based on a rotational speed of the motor at time of the braking start and the calculated speed deceleration rate, so that the motor drive means is controlled based on the calculated braking time.