一、概述(shu)
交(jiao)流鼠籠式異步電(dian)動機(ji)(ji)如(ru)果直(zhi)接(jie)起動會(hui)產生很(hen)大(da)沖擊電(dian)流，會(hui)對電(dian)阻及其負(fu)載(zai)造成沖擊，甚(shen)至(zhi)危害電(dian)網安全運行。生產機(ji)(ji)械對電(dian)動機(ji)(ji)的(de)起動也有(you)各種(zhong)不同的(de)要(yao)求，有(you)些需要(yao)平穩起動的(de)生產機(ji)(ji)械也不允許直(zhi)接(jie)起動。
星-三(san)角轉換(huan)起動，自藕變壓器降壓起動的(de)(de)主要(yao)問題是起動過程中(zhong)起動電壓和(he)運行電壓轉換(huan)時的(de)(de)電流沖(chong)擊(ji)，對(dui)電網和(he)機械產生沖(chong)擊(ji)，產生損害。應用晶閘管交流調壓技術的(de)(de)固(gu)態軟起動器，是目前降壓起動方式中(zhong)合理、先進的(de)(de)起動方式。
二、工作原理
軟啟動調(diao)(diao)速實際上是(shi)(shi)—個(ge)晶(jing)(jing)(jing)閘(zha)(zha)管(guan)(guan)(guan)交流(liu)調(diao)(diao)壓(ya)(ya)(ya)器。改變晶(jing)(jing)(jing)閘(zha)(zha)管(guan)(guan)(guan)的觸發角，就可調(diao)(diao)節(jie)晶(jing)(jing)(jing)閘(zha)(zha)管(guan)(guan)(guan)調(diao)(diao)壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路(lu)的輸(shu)出(chu)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)。用軟起動器起動電(dian)(dian)(dian)(dian)機(ji)時(shi)：設(she)置(zhi)一個(ge)初始電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)，晶(jing)(jing)(jing)閘(zha)(zha)管(guan)(guan)(guan)調(diao)(diao)壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路(lu)的輸(shu)出(chu)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)就從這(zhe)一點(dian)開始上升(sheng)；設(she)置(zhi)一個(ge)升(sheng)壓(ya)(ya)(ya)時(shi)間，逐(zhu)漸(jian)增(zeng)加晶(jing)(jing)(jing)閘(zha)(zha)管(guan)(guan)(guan)調(diao)(diao)壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路(lu)的輸(shu)出(chu)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)，電(dian)(dian)(dian)(dian)機(ji)逐(zhu)漸(jian)加速；設(she)置(zhi)—個(ge)限流(liu)倍數，根據電(dian)(dian)(dian)(dian)流(liu)互感器測得的實際電(dian)(dian)(dian)(dian)流(liu)值(zhi)，控(kong)制晶(jing)(jing)(jing)閘(zha)(zha)管(guan)(guan)(guan)調(diao)(diao)壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路(lu)的輸(shu)出(chu)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)，使電(dian)(dian)(dian)(dian)機(ji)的實際電(dian)(dian)(dian)(dian)流(liu)不超過(guo)限流(liu)值(zhi)。這(zhe)樣在整個(ge)起動過(guo)程中，軟啟動柜(ju)的輸(shu)出(chu)是(shi)(shi)一個(ge)平滑的升(sheng)壓(ya)(ya)(ya)過(guo)程（且具有限流(liu)功能(neng)），直到晶(jing)(jing)(jing)閘(zha)(zha)管(guan)(guan)(guan)全導(dao)通，電(dian)(dian)(dian)(dian)機(ji)在額定電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)下(xia)工(gong)作。

典型(xing)應用簡介
水泵：利用(yong)泵控制功能，在(zai)起動和停止時，減少(shao)液流(liu)沖擊(ji)所產(chan)生(sheng)的泵流(liu)水錘現象，節省(sheng)了系統維修費用(yong)； 
球磨機：利(li)用(yong)電壓斜坡起動，減(jian)(jian)少齒輪轉(zhuan)矩(ju)的磨損，減(jian)(jian)少維修工作量延長使用(yong)壽命； 
風(feng)機：利(li)用固態(tai)軟起動器(qi)(qi)取(qu)代了傳統起動器(qi)(qi)，減少皮帶(dai)磨(mo)損和機械(xie)沖擊； 
壓縮機：利用限流，實現了平滑起動，降低電(dian)機溫升； 
破(po)碎機(ji)：利用堵轉保(bao)護和(he)快速保(bao)護，避(bi)免機(ji)械故障和(he)阻塞造成電(dian)動機(ji)過(guo)熱而(er)燒毀； 
輸送機械(xie)：利用(yong)軟(ruan)起動(dong)和(he)軟(ruan)停機控(kong)制，實現(xian)平滑漸進的(de)(de)起動(dong)過(guo)程和(he)平滑減速的(de)(de)停車過(guo)程，避免了因沖(chong)擊而對物料(liao)和(he)設備(bei)造成的(de)(de)損傷.