| 摘要 |
PURPOSE:To control the rotation of a motor stably and accurately for disorder by APC-controlling the rotation of the motor by a PG signal, then APC- controlling the rotation of the motor by an FT signal after locking the phase. CONSTITUTION:A PG signal representing the rotary reference position of a diskette 11 is detected one by one for one revolution by a PG detector 13, the phase difference from a synchronizing signal Vsync is detected by the first APC circuit 15 to lock the phase. An FG detector 14 detects the FG signal of n pulses per one revolution in response to the rotary angle of a motor 12, the phase difference between the FG signal and the PG signal is detected by an offset detector 22, the phase difference and the phase difference from the FG signal are detected by the second APC circuit 30 to control the motor. |
