一、概述
交流鼠籠式異步電動(dong)(dong)機(ji)如(ru)果直(zhi)接起動(dong)(dong)會(hui)(hui)產(chan)生(sheng)很(hen)大沖(chong)擊(ji)電流，會(hui)(hui)對電阻及其負載造成沖(chong)擊(ji)，甚至危害電網(wang)安全運行(xing)。生(sheng)產(chan)機(ji)械(xie)對電動(dong)(dong)機(ji)的起動(dong)(dong)也有各種不(bu)同的要求，有些(xie)需要平穩起動(dong)(dong)的生(sheng)產(chan)機(ji)械(xie)也不(bu)允許直(zhi)接起動(dong)(dong)。
星-三角轉(zhuan)換(huan)起動(dong)，自藕(ou)變壓(ya)器降壓(ya)起動(dong)的主要問題是起動(dong)過程中(zhong)(zhong)起動(dong)電(dian)(dian)壓(ya)和運(yun)行(xing)電(dian)(dian)壓(ya)轉(zhuan)換(huan)時(shi)的電(dian)(dian)流沖擊(ji)，對(dui)電(dian)(dian)網和機(ji)械(xie)產(chan)生沖擊(ji)，產(chan)生損(sun)害。應用晶(jing)閘管交流調壓(ya)技術(shu)的固態軟起動(dong)器，是目前降壓(ya)起動(dong)方式(shi)中(zhong)(zhong)合理、先進(jin)的起動(dong)方式(shi)。
二、工作原理(li)
軟啟(qi)動調(diao)速實際(ji)(ji)上(shang)是(shi)—個晶閘(zha)(zha)管(guan)交(jiao)流調(diao)壓(ya)(ya)(ya)器。改變晶閘(zha)(zha)管(guan)的(de)觸發角，就(jiu)(jiu)可調(diao)節晶閘(zha)(zha)管(guan)調(diao)壓(ya)(ya)(ya)電(dian)(dian)(dian)路(lu)的(de)輸出(chu)電(dian)(dian)(dian)壓(ya)(ya)(ya)。用軟起(qi)動(dong)(dong)器起(qi)動(dong)(dong)電(dian)(dian)(dian)機(ji)時：設置一個初始電(dian)(dian)(dian)壓(ya)(ya)(ya)，晶閘(zha)(zha)管(guan)調(diao)壓(ya)(ya)(ya)電(dian)(dian)(dian)路(lu)的(de)輸出(chu)電(dian)(dian)(dian)壓(ya)(ya)(ya)就(jiu)(jiu)從(cong)這一點開始上(shang)升(sheng)；設置一個升(sheng)壓(ya)(ya)(ya)時間，逐(zhu)漸增加(jia)晶閘(zha)(zha)管(guan)調(diao)壓(ya)(ya)(ya)電(dian)(dian)(dian)路(lu)的(de)輸出(chu)電(dian)(dian)(dian)壓(ya)(ya)(ya)，電(dian)(dian)(dian)機(ji)逐(zhu)漸加(jia)速；設置—個限(xian)(xian)流倍數，根(gen)據(ju)電(dian)(dian)(dian)流互感器測得的(de)實際(ji)(ji)電(dian)(dian)(dian)流值，控(kong)制晶閘(zha)(zha)管(guan)調(diao)壓(ya)(ya)(ya)電(dian)(dian)(dian)路(lu)的(de)輸出(chu)電(dian)(dian)(dian)壓(ya)(ya)(ya)，使電(dian)(dian)(dian)機(ji)的(de)實際(ji)(ji)電(dian)(dian)(dian)流不超過(guo)限(xian)(xian)流值。這樣在整個起(qi)動(dong)(dong)過(guo)程中，軟啟動(dong)(dong)柜(ju)的(de)輸出(chu)是(shi)一個平滑(hua)的(de)升(sheng)壓(ya)(ya)(ya)過(guo)程（且具有限(xian)(xian)流功能），直(zhi)到晶閘(zha)(zha)管(guan)全導通，電(dian)(dian)(dian)機(ji)在額定電(dian)(dian)(dian)壓(ya)(ya)(ya)下工作。

典(dian)型應用簡介
水(shui)(shui)泵：利用泵控(kong)制功能，在起動和(he)停(ting)止時，減少液流沖(chong)擊(ji)所產生(sheng)的(de)泵流水(shui)(shui)錘現象，節省(sheng)了系統維修(xiu)費用； 
球磨(mo)機(ji)：利用電壓斜坡(po)起動，減(jian)少(shao)齒(chi)輪轉(zhuan)矩的磨(mo)損，減(jian)少(shao)維(wei)修工作量延長使用壽命(ming)； 
風機：利用固(gu)態(tai)軟起動(dong)器(qi)取代了傳(chuan)統起動(dong)器(qi)，減少(shao)皮帶磨(mo)損和機械沖擊(ji)； 
壓縮機：利(li)用限流，實現了(le)平滑起動(dong)，降低(di)電機溫升； 
破碎機(ji)：利用堵(du)轉(zhuan)保(bao)護和(he)快速保(bao)護，避免機(ji)械(xie)故障和(he)阻塞造成(cheng)電動機(ji)過熱而燒毀(hui)； 
輸送機械：利(li)用軟起(qi)動和(he)軟停(ting)(ting)機控(kong)制，實現平(ping)滑漸進的(de)起(qi)動過(guo)程和(he)平(ping)滑減速的(de)停(ting)(ting)車(che)過(guo)程，避免了因沖擊而對(dui)物料(liao)和(he)設備造(zao)成的(de)損(sun)傷(shang).