一、概述(shu)
交(jiao)流(liu)鼠籠式(shi)異步電動(dong)機(ji)如果直接起(qi)動(dong)會產(chan)生(sheng)很大沖擊電流(liu)，會對電阻(zu)及(ji)其負(fu)載造成(cheng)沖擊，甚至(zhi)危害電網安全運行。生(sheng)產(chan)機(ji)械對電動(dong)機(ji)的起(qi)動(dong)也有各種不同的要求，有些需要平穩起(qi)動(dong)的生(sheng)產(chan)機(ji)械也不允許直接起(qi)動(dong)。
星-三角轉換(huan)起(qi)動，自藕變壓(ya)(ya)器降(jiang)壓(ya)(ya)起(qi)動的主要問題是(shi)起(qi)動過程中起(qi)動電(dian)壓(ya)(ya)和運行電(dian)壓(ya)(ya)轉換(huan)時(shi)的電(dian)流沖擊，對電(dian)網(wang)和機械產生沖擊，產生損害。應用晶閘管交流調壓(ya)(ya)技術(shu)的固態軟(ruan)起(qi)動器，是(shi)目前降(jiang)壓(ya)(ya)起(qi)動方(fang)(fang)式中合理、先(xian)進的起(qi)動方(fang)(fang)式。
二、工作原理
軟啟(qi)動(dong)調(diao)(diao)速(su)實際(ji)上是—個晶(jing)閘(zha)(zha)管(guan)交流調(diao)(diao)壓(ya)器。改(gai)變(bian)晶(jing)閘(zha)(zha)管(guan)的(de)(de)觸發角，就(jiu)可調(diao)(diao)節晶(jing)閘(zha)(zha)管(guan)調(diao)(diao)壓(ya)電(dian)(dian)(dian)(dian)(dian)路的(de)(de)輸出(chu)電(dian)(dian)(dian)(dian)(dian)壓(ya)。用軟起(qi)(qi)動器起(qi)(qi)動電(dian)(dian)(dian)(dian)(dian)機(ji)時：設(she)置一(yi)個初始電(dian)(dian)(dian)(dian)(dian)壓(ya)，晶(jing)閘(zha)(zha)管(guan)調(diao)(diao)壓(ya)電(dian)(dian)(dian)(dian)(dian)路的(de)(de)輸出(chu)電(dian)(dian)(dian)(dian)(dian)壓(ya)就(jiu)從這一(yi)點開始上升(sheng)；設(she)置一(yi)個升(sheng)壓(ya)時間，逐(zhu)漸(jian)(jian)增加晶(jing)閘(zha)(zha)管(guan)調(diao)(diao)壓(ya)電(dian)(dian)(dian)(dian)(dian)路的(de)(de)輸出(chu)電(dian)(dian)(dian)(dian)(dian)壓(ya)，電(dian)(dian)(dian)(dian)(dian)機(ji)逐(zhu)漸(jian)(jian)加速(su)；設(she)置—個限(xian)流倍(bei)數，根據(ju)電(dian)(dian)(dian)(dian)(dian)流互感器測得的(de)(de)實際(ji)電(dian)(dian)(dian)(dian)(dian)流值(zhi)，控(kong)制晶(jing)閘(zha)(zha)管(guan)調(diao)(diao)壓(ya)電(dian)(dian)(dian)(dian)(dian)路的(de)(de)輸出(chu)電(dian)(dian)(dian)(dian)(dian)壓(ya)，使電(dian)(dian)(dian)(dian)(dian)機(ji)的(de)(de)實際(ji)電(dian)(dian)(dian)(dian)(dian)流不(bu)超(chao)過(guo)(guo)限(xian)流值(zhi)。這樣在整個起(qi)(qi)動過(guo)(guo)程中，軟啟(qi)動柜(ju)的(de)(de)輸出(chu)是一(yi)個平滑的(de)(de)升(sheng)壓(ya)過(guo)(guo)程（且具有限(xian)流功能），直到(dao)晶(jing)閘(zha)(zha)管(guan)全(quan)導通，電(dian)(dian)(dian)(dian)(dian)機(ji)在額定電(dian)(dian)(dian)(dian)(dian)壓(ya)下工(gong)作(zuo)。

典型(xing)應(ying)用簡介
水泵(beng)：利(li)用(yong)泵(beng)控(kong)制功能，在起動和停止時，減(jian)少液流沖擊所(suo)產(chan)生(sheng)的泵(beng)流水錘(chui)現象，節省了(le)系統維修(xiu)費用(yong)； 
球(qiu)磨機：利用(yong)電(dian)壓斜坡起動，減(jian)少齒輪(lun)轉矩(ju)的磨損，減(jian)少維修工(gong)作量延長使(shi)用(yong)壽命； 
風機(ji)：利用固態軟起動(dong)器取代(dai)了傳(chuan)統起動(dong)器，減(jian)少皮帶磨損和機(ji)械沖擊； 
壓縮機：利用限流，實現了(le)平(ping)滑起動，降低電機溫升； 
破碎機：利用堵轉保(bao)(bao)護(hu)和快速保(bao)(bao)護(hu)，避免機械故(gu)障和阻塞造成(cheng)電動(dong)機過熱而燒毀； 
輸送機(ji)械(xie)：利用(yong)軟(ruan)(ruan)起動和軟(ruan)(ruan)停機(ji)控制，實現平(ping)滑漸進的(de)(de)起動過程和平(ping)滑減速(su)的(de)(de)停車過程，避免了因沖擊而對(dui)物料和設備造成的(de)(de)損傷.