Use is made of that zero-sequence transformer outputs a voltage signal when phase-failure occurs in three-phase induction motor.

这种新方法的基础是零序变压器在三相异步电动机断相时输出一个电压信号。

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Further study of Circuit exchange regulator presents, takes the starting current as feedback signal to complete closed-loop control of soft start control of the three-phase induction motor.

对交流调压电路进行了进一步的研究，利用起动电流信号作为反馈量，对三相感应电动机软起动控制系统进行闭环控制。

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