| 摘要 |
PURPOSE:To realize the revolution control of a motor which is free from a speed fluctuation and is always stable even if the revolution of the motor and the duty of an FG sensor are varied. CONSTITUTION:A detection signal which is outputted from a period measuring device 6 which detects the revolution frequency of a drum motor 1 and a holding signal outputted from a latch circuit 22 which holds the detection signal outputted from the period measuring device 6 are inputted to an adder 23. The adder 23 operates the sum of the detection signal and the holding signal and the revolution of the drum motor 1 is controlled in accordance with a signal obtained by the operation. |
