一、概述
交流(liu)鼠籠式(shi)異步電(dian)(dian)(dian)動(dong)(dong)機如(ru)果直接起動(dong)(dong)會產生很大沖擊電(dian)(dian)(dian)流(liu)，會對電(dian)(dian)(dian)阻及其負載造成沖擊，甚至危害電(dian)(dian)(dian)網安全運行。生產機械(xie)對電(dian)(dian)(dian)動(dong)(dong)機的起動(dong)(dong)也有(you)各種(zhong)不同的要求(qiu)，有(you)些需要平穩起動(dong)(dong)的生產機械(xie)也不允許直接起動(dong)(dong)。
星-三角(jiao)轉(zhuan)換起(qi)動，自藕變壓(ya)(ya)(ya)器降壓(ya)(ya)(ya)起(qi)動的主要(yao)問題是起(qi)動過程中(zhong)起(qi)動電壓(ya)(ya)(ya)和運(yun)行電壓(ya)(ya)(ya)轉(zhuan)換時的電流沖擊，對電網和機械產生(sheng)沖擊，產生(sheng)損害。應用(yong)晶閘管交流調壓(ya)(ya)(ya)技術(shu)的固態(tai)軟起(qi)動器，是目前降壓(ya)(ya)(ya)起(qi)動方式(shi)中(zhong)合理、先進的起(qi)動方式(shi)。
二、工作原理
軟啟(qi)動(dong)調(diao)(diao)速實際(ji)上(shang)是(shi)—個(ge)晶(jing)閘(zha)管(guan)交流(liu)(liu)調(diao)(diao)壓(ya)(ya)(ya)(ya)(ya)器。改變(bian)晶(jing)閘(zha)管(guan)的(de)(de)(de)觸發角(jiao)，就(jiu)可調(diao)(diao)節晶(jing)閘(zha)管(guan)調(diao)(diao)壓(ya)(ya)(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路的(de)(de)(de)輸(shu)出電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)。用軟起動(dong)器起動(dong)電(dian)(dian)(dian)(dian)機(ji)時：設置一個(ge)初始電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)，晶(jing)閘(zha)管(guan)調(diao)(diao)壓(ya)(ya)(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路的(de)(de)(de)輸(shu)出電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)就(jiu)從這(zhe)一點開始上(shang)升；設置一個(ge)升壓(ya)(ya)(ya)(ya)(ya)時間，逐(zhu)漸增加(jia)晶(jing)閘(zha)管(guan)調(diao)(diao)壓(ya)(ya)(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路的(de)(de)(de)輸(shu)出電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)，電(dian)(dian)(dian)(dian)機(ji)逐(zhu)漸加(jia)速；設置—個(ge)限(xian)流(liu)(liu)倍數，根據電(dian)(dian)(dian)(dian)流(liu)(liu)互感器測得的(de)(de)(de)實際(ji)電(dian)(dian)(dian)(dian)流(liu)(liu)值(zhi)，控制晶(jing)閘(zha)管(guan)調(diao)(diao)壓(ya)(ya)(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路的(de)(de)(de)輸(shu)出電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)，使電(dian)(dian)(dian)(dian)機(ji)的(de)(de)(de)實際(ji)電(dian)(dian)(dian)(dian)流(liu)(liu)不(bu)超過(guo)(guo)限(xian)流(liu)(liu)值(zhi)。這(zhe)樣(yang)在(zai)整個(ge)起動(dong)過(guo)(guo)程(cheng)中，軟啟動(dong)柜(ju)的(de)(de)(de)輸(shu)出是(shi)一個(ge)平(ping)滑的(de)(de)(de)升壓(ya)(ya)(ya)(ya)(ya)過(guo)(guo)程(cheng)（且(qie)具有(you)限(xian)流(liu)(liu)功能），直到晶(jing)閘(zha)管(guan)全導(dao)通，電(dian)(dian)(dian)(dian)機(ji)在(zai)額定電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)下工(gong)作。

典型應用簡介
水(shui)泵(beng)：利用(yong)泵(beng)控制(zhi)功能，在起動和停止時(shi)，減少液流沖擊所產生的(de)泵(beng)流水(shui)錘現象，節省了(le)系(xi)統(tong)維修(xiu)費用(yong)； 
球磨機：利用(yong)電壓斜坡起動，減(jian)(jian)少齒輪(lun)轉矩的磨損，減(jian)(jian)少維修工(gong)作量延長(chang)使(shi)用(yong)壽命； 
風機：利(li)用(yong)固態軟起動器(qi)取(qu)代了傳統起動器(qi)，減少皮帶磨損和機械沖擊； 
壓(ya)縮機：利用限流(liu)，實現了平滑(hua)起動，降低電(dian)機溫升； 
破碎機(ji)：利用堵轉(zhuan)保護(hu)和快速保護(hu)，避(bi)免機(ji)械故(gu)障和阻塞造成電(dian)動(dong)機(ji)過熱而燒(shao)毀； 
輸送機械：利(li)用軟起(qi)動和(he)軟停機控制，實現平滑漸進的起(qi)動過(guo)程和(he)平滑減速的停車(che)過(guo)程，避免了因(yin)沖(chong)擊而(er)對物料和(he)設備造(zao)成的損(sun)傷.