晶闸管调压软起动器采用大功率可控硅作主回路开关元件，通过改变可控硅的导通角来实现电动机电压的平稳升降和无触点通断。起动电流可根据负载和工况任意设定。起动器还能自动监视电动机的功率因数和负载情况，经过计算来决定电动机的运行电压，以便提高电动机功率因数，使其以小电流运行，降低损耗，提高效率。它是实现电动机精确控制、替代传统起动器的理想选择5 变频器调速软起动器采用变频器控制的电动机具有良好的动态、静态性能，在低速时也可以任意调节电动机转矩，起动转矩高达150%的额定转矩。

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它可以恒转矩起动电动机，起动电流可限制在150%的额定电流以内，可以实现自由停车、软停车、泵停机、直流制动，满足有特殊要求的电动机控制。6 软起动器控制电动机的几个重要概念(1)脉冲突跳起动方式对于静阻力矩较大的负载，必须施加一个短时的大起动力矩，以克服静摩擦力，这就要求起动器可以短时输出90%的额定电压(2)接触器旁路工作模式当电动机全速运行后，用旁路接触器来取代已完成任务的软起动器，以降低晶闸管的热耗，提高系统效率。在这种模式下用一台软起动器起动多台电动机。

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