| 摘要 |
PROBLEM TO BE SOLVED: To provide a PWM control device for a motor capable of reducing noise generation caused by a drive signal of the motor.SOLUTION: Control means of a motor outputs signals as one group in a second frequency lower than a human audible range. The signals are formed from three modes of a first mode formed from a pulse group of a first frequency higher than the human audible range, a second mode in which a voltage is supplied to the motor longer than one cycle of the first frequency, and a third mode in which voltage application to the motor is stopped longer than one cycle of the first frequency. In one cycle of the second frequency, output times of at least the first mode and the third mode are variably controlled. |
