| 摘要 |
PURPOSE:To control the rotary phase and speed of a motor which are stabilized for disturbance by absorbing by a completely integral filter using a loop filter the variations in a motor speed setting reference voltage and a load torque. CONSTITUTION:A spindle motor 1 rotatably drives an optical disc 2. A phase detector 3 detects the record starting position mark attached onto a disc 2, and detects the rotary phase of the disc 2 and hence the rotary phase of the motor 1. A speed detector 4 detects the rotating speed of the motor 1. A phase control loop is composed of the detector 3, a phase frequency comparator 5, a loop filter 6, a phase loop amplifier 7, a mixer 8, a motor driver 14, and the motor 1, and speed control loop is composed of the detector 4, an f/V converter 9, an error detector 10, a low pass filter 12, a speed loop amplifier 13, the mixture 8, a motor driver 14, and the motor 1. |
