| 摘要 |
PURPOSE:To realize constant speed control and to suppress noise or vibration by feedforward controlling a rotational speed difference due to difference of DC power supply voltage of driving power supply circuit. CONSTITUTION:Power supply voltage is continuously sensed by means of comparators 6a-6e or the like and when the power supply voltage is high, OFF interval is set longer than ON interval by means of switching circuits 7a-7e to drive a motor otherwise DC driving takes place at full duty. |
