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软起动器实际上是个调压器,用于电机起动时,输出只改变电压。
软起动器可以综合为:
电机软起动、软停车、轻载节能和多种保护功能于一体的新颖电机控制装置。通过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,使被控电机的输入电压按不同的要求而变化。电动机软起动器是运用串接于电源与被控电机之间的软起动器,控制其内部晶闸管的导通角,使电机输入电压从零以预设函数关系逐渐上升,直至起动结束,赋予电机全电压,即为软起动,在软启动过程中,电机起动转矩逐渐增加,转速也逐渐增加。