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.
Maybe popular for reducing torque ripple further, but the large number of power devices and connections will probably limit four phase to a limited application field.
也许是受欢迎的转矩脉动进一步减少,但是大量的电力设备和连接可能会限制四阶段有限的应用领域。
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So when calculating the limit of the torque, we should consider to compensate it with the moment and accelerative torque of the paper.