Soft-starter can limit the start current and torque of the induction-motor, reduce the influence to the power circuit in the starting process, and prolong electrical equipments' working life.
A soft starter of three-phase induction will be discussed in this paper to solve the problems.
为了解决上述问题,本文研究了三相感应电动机软起动器。
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The principle of the soft starter is reducing the voltage applied to the stator of the induction motor by control the triggering angle of the thyristors in order to limit the starting current surge.