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Manabu Kosaka

Hiroyuki Yamai

Nobuki Kitano

Yoshihito Sanga

When torque control is performed for suppressing speed change within one rotation using a synchronous motor (,) controlled by an inverter (,) for a load having cyclic torque changing, an arrangement is employed which includes inverter control means (,) (,) for controlling the inverter (,) so as to superpose a changing amount upon an amplitude and phase of a current waveform or voltage waveform, so that torque control is realized for reducing low speed vibration of a cyclic intermittent load with maximum efficiency condition and with practical arrangement.

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Okamoto-cho, Kusatsu-shi, Shiga 525-0044, Japan

Manabu Kosaka