| 摘要 |
A motor/generator (20) is provided with plural groups of coils (6), and inverters (30) supplying a polyphase AC current converted from a DC current to each group of coils (6) in response to pulse width modulation signals output by a microprocessor (25, 35). The microprocessor (25, 35) is programmed to prevent increases in high frequency components in the polyphase AC current by controlling a specific inverter (30) to stop supplying the polyphase AC current (S20), when a load on the motor/generator is smaller than a reference load (S12). As a result, energy conversion efficiency of the motor/generator at low loads is improved.
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