单相电动机运转时，产生与运转方向逆方向的转矩，因此不可能在短时间内改变方向。
The single-phase motor has a reverse direction with the totating's when operated.
如果更多的电力需求是间歇性，发动机的功率可补充电动机在电源时，需要更多的时间。
If demand for more power is intermittent, the power of the engine can be supplemented by an electric motor during times when more power is needed.
对电动机在不同性质的负载下，恒电流起动过程中起动时间与电压率、起动电流倍数的关系进行了理论分析。
The paper analyses the relation of the starting-time and the multiple of starting current and voltage in the current-limited starting process of motor with different character load .
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