| 摘要 |
A PWM inverter system which eliminates a switching loss and minimizes the distortion ratio of the output voltage thereof. The PWM inverter system includes a first means for producing switching signals for 3-phase modulation by which switching elements for each phase make a switching operation, a second means for producing switching signals for 2-phase modulation by which a switching operation for one phase is unnecessary, and a change-over for changing over the two means in response, for example, to a magnitude value of the inverter output voltage.
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