晶閘管軟(ruan)(ruan)(ruan)起(qi)動(dong)(dong)器是一種集軟(ruan)(ruan)(ruan)起(qi)動(dong)(dong)、軟(ruan)(ruan)(ruan)停車(che)、輕載節能(neng)和多(duo)功能(neng)保(bao)護(hu)于(yu)一體的新穎電機控(kong)制裝備，又稱為SoftStarter。它不(bu)僅實現(xian)在整個啟動(dong)(dong)過(guo)程中無沖擊(ji)而平滑地(di)啟動(dong)(dong)電機，而且(qie)可根(gen)據電動(dong)(dong)機負(fu)載的特(te)性來調節啟動(dong)(dong)過(guo)程中的參數，如限流(liu)值、啟動(dong)(dong)時間等。此外，軟(ruan)(ruan)(ruan)起(qi)動(dong)(dong)器還具有(you)多(duo)種對電機保(bao)護(hu)功能(neng)，這就(jiu)從(cong)根(gen)本上解決了傳(chuan)統的降(jiang)壓啟動(dong)(dong)設備的諸(zhu)多(duo)弊端.

籠型電(dian)(dian)機(ji)傳統的減壓(ya)起(qi)(qi)動(dong)(dong)(dong)方(fang)式(shi)有Y-q 起(qi)(qi)動(dong)(dong)(dong)、自耦減壓(ya)起(qi)(qi)動(dong)(dong)(dong)、電(dian)(dian)抗(kang)器起(qi)(qi)動(dong)(dong)(dong)等(deng)。這些起(qi)(qi)動(dong)(dong)(dong)方(fang)式(shi)都(dou)屬于有級減壓(ya)起(qi)(qi)動(dong)(dong)(dong)，存在(zai)明顯缺點，即(ji)起(qi)(qi)動(dong)(dong)(dong)過程中出現二(er)次沖擊(ji) 

晶閘(zha)(zha)管(guan)軟(ruan)起(qi)(qi)(qi)動(dong)(dong)器與傳統減壓(ya)起(qi)(qi)(qi)動(dong)(dong)方式的不同之處是：無沖擊電(dian)流。軟(ruan)起(qi)(qi)(qi)動(dong)(dong)器在起(qi)(qi)(qi)動(dong)(dong)電(dian)機(ji)時，通(tong)(tong)過逐(zhu)漸增(zeng)大(da)晶閘(zha)(zha)管(guan)導通(tong)(tong)角，使電(dian)機(ji)起(qi)(qi)(qi)動(dong)(dong)電(dian)流從(cong)零線性(xing)上升至設定值。恒流起(qi)(qi)(qi)動(dong)(dong)。軟(ruan)起(qi)(qi)(qi)動(dong)(dong)器可以引入電(dian)流閉環(huan)控制，使電(dian)機(ji)在起(qi)(qi)(qi)動(dong)(dong)過程中(zhong)保持恒流，確(que)保電(dian)機(ji)平(ping)穩起(qi)(qi)(qi)動(dong)(dong)。