| 摘要 |
PURPOSE:To reduce the pulsating component of a current and a torque by comparing the actual load current with a reference sinusoidal current, thereby controlling the conducting mode of a semiconductor element group. CONSTITUTION:A sinusoidal current pattern to become reference is quantized and written in an ROM. This current pattern is fed to a D/A converter. The analog output voltage of the converter corresponds to the reference sinusoidal current, and this current is compared with the actual load current detected through an insulating amplifier IA. The compared result is held in a latch circuit L, and the semiconductor switches S1, S2 of an inverter are switched ON or OFF by the output of the latch circuit L. |
