Kabushiki Kaisha Toyota Chuo Kenkyusho

Shojirou Miyamoto

Toshitaka Kuno

Hiroshi Moribe

The invention relates to a control circuit of a pulse width modulation inverter, wherein a current control circuit to output a current control signal corresponding to a current command signal is provided, main transistors of a main circuit of the pulse width modulation inverter are switchingly controlled in response to a current control signal, whereby a driving current supplied to a motor from the pulse width modulation inverter is controlled to a value corresponding to the current command signal. The current control circuit is of such an arrangement that the current control circuit corrects the current command signal in response to the speed detection signal to compensate an error in current control due to a counter electromotive force of a DC motor, while exercising a proportional control over the driving current in accordance with a current command deviation value of a driving current detection signal from the current command signal, so that the motor can be controlled at high speed and with high accuracy.

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Shojirou Miyamoto