| 摘要 |
PURPOSE:To reduce electromagnetic noise of motor by performing drive control and brake control of the motor according to the pulse width modulated(PWM) output signal from a switching control section. CONSTITUTION:A drive control section 4 produces a PWM signal having such pulse width as corresponding to the magnitude of an output signal obtained by adding an acceleration signal to an output which is obtained by subtracting a rotation signal from the acceleration signal. A brake controls section 8 produces a PWM signal having pulse width corresponding to the magnitude of an output obtained by subtracting the acceleration signal from the rotation signal, and produces a brake signal when the subtracted output exceeds over a predetermined value. A switching control section 5 switches the PWM signal output from the drive control section 4 according to the forward/reverse control of a motor 11, and produces an output which is obtained by switching the PWM signal and the PWM signal from the brake control section according to the brake signal. A motor drive section 7 performs drive control or brake control of the motor 11 according to the PWM signal output from the switching control section 5. By such arrangement, electromagnetic noise of the motor 11 can be suppressed. |
