| 摘要 |
A controller for a permanent-magnetic synchronous motor makes switching from the asynchronous pulse mode to the synchronous pulse mode when the modulation factor is not less than a first setting value or the inverter output frequency is not less than a second setting value, and makes switching from the synchronous pulse mode to the asynchronous pulse mode when the modulation factor is less than the first setting value and the inverter output frequency is less than the second setting value. In order to prevent the current vibration or torque pulsation in the motor, a second setting value is set up such that the number of pulses included in ahalf cycle of the fundamental wave of the inverter output voltage is not less than the specified value.
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