软起动器是一种用来控制异步电动机的设备，集电机软起动、软停车和多种保护功能于一体的电机控制装置，国外称为Soft Starter。它的主要构成是串接于电源与被控电机之间的三相反并联闸管及其电子控制电路。 运用不同的方法，控制三相反并联晶闸管的导通角，使被控电机的输入电压按不 同的要求而变化，就可实现不同的功能。

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