一、概述
交流鼠籠式(shi)異(yi)步電(dian)(dian)動(dong)(dong)(dong)機如果直接起(qi)(qi)動(dong)(dong)(dong)會(hui)產(chan)生(sheng)很大沖擊電(dian)(dian)流，會(hui)對電(dian)(dian)阻及其負(fu)載(zai)造成沖擊，甚至危(wei)害電(dian)(dian)網安全(quan)運行。生(sheng)產(chan)機械(xie)(xie)對電(dian)(dian)動(dong)(dong)(dong)機的起(qi)(qi)動(dong)(dong)(dong)也(ye)有各種不同的要(yao)求，有些需(xu)要(yao)平(ping)穩起(qi)(qi)動(dong)(dong)(dong)的生(sheng)產(chan)機械(xie)(xie)也(ye)不允許直接起(qi)(qi)動(dong)(dong)(dong)。
星-三角(jiao)轉換(huan)起(qi)(qi)動，自(zi)藕變壓(ya)(ya)器降(jiang)壓(ya)(ya)起(qi)(qi)動的主(zhu)要問題是起(qi)(qi)動過(guo)程中(zhong)起(qi)(qi)動電(dian)壓(ya)(ya)和運行電(dian)壓(ya)(ya)轉換(huan)時的電(dian)流沖擊，對(dui)電(dian)網和機械(xie)產(chan)生沖擊，產(chan)生損害(hai)。應用晶閘管交流調壓(ya)(ya)技術的固態軟起(qi)(qi)動器，是目前(qian)降(jiang)壓(ya)(ya)起(qi)(qi)動方(fang)式中(zhong)合理(li)、先進的起(qi)(qi)動方(fang)式。
二(er)、工(gong)作原理(li)
軟啟動調(diao)速(su)實際(ji)上(shang)是(shi)—個(ge)(ge)晶(jing)(jing)(jing)(jing)閘管(guan)(guan)交流(liu)調(diao)壓(ya)(ya)器(qi)。改變(bian)晶(jing)(jing)(jing)(jing)閘管(guan)(guan)的觸發角，就可調(diao)節晶(jing)(jing)(jing)(jing)閘管(guan)(guan)調(diao)壓(ya)(ya)電(dian)(dian)(dian)路的輸出(chu)(chu)(chu)電(dian)(dian)(dian)壓(ya)(ya)。用(yong)軟起動(dong)(dong)器(qi)起動(dong)(dong)電(dian)(dian)(dian)機時：設置一(yi)個(ge)(ge)初始電(dian)(dian)(dian)壓(ya)(ya)，晶(jing)(jing)(jing)(jing)閘管(guan)(guan)調(diao)壓(ya)(ya)電(dian)(dian)(dian)路的輸出(chu)(chu)(chu)電(dian)(dian)(dian)壓(ya)(ya)就從(cong)這一(yi)點(dian)開始上(shang)升；設置一(yi)個(ge)(ge)升壓(ya)(ya)時間，逐漸(jian)增加(jia)(jia)晶(jing)(jing)(jing)(jing)閘管(guan)(guan)調(diao)壓(ya)(ya)電(dian)(dian)(dian)路的輸出(chu)(chu)(chu)電(dian)(dian)(dian)壓(ya)(ya)，電(dian)(dian)(dian)機逐漸(jian)加(jia)(jia)速(su)；設置—個(ge)(ge)限(xian)(xian)流(liu)倍數(shu)，根據(ju)電(dian)(dian)(dian)流(liu)互(hu)感器(qi)測(ce)得(de)的實際(ji)電(dian)(dian)(dian)流(liu)值，控(kong)制晶(jing)(jing)(jing)(jing)閘管(guan)(guan)調(diao)壓(ya)(ya)電(dian)(dian)(dian)路的輸出(chu)(chu)(chu)電(dian)(dian)(dian)壓(ya)(ya)，使(shi)電(dian)(dian)(dian)機的實際(ji)電(dian)(dian)(dian)流(liu)不超(chao)過限(xian)(xian)流(liu)值。這樣(yang)在整個(ge)(ge)起動(dong)(dong)過程(cheng)(cheng)中，軟啟動(dong)(dong)柜的輸出(chu)(chu)(chu)是(shi)一(yi)個(ge)(ge)平滑的升壓(ya)(ya)過程(cheng)(cheng)（且具有(you)限(xian)(xian)流(liu)功(gong)能），直到晶(jing)(jing)(jing)(jing)閘管(guan)(guan)全(quan)導通，電(dian)(dian)(dian)機在額定(ding)電(dian)(dian)(dian)壓(ya)(ya)下工作。

典(dian)型應用簡介(jie)
水泵：利用泵控制(zhi)功能，在起動和停(ting)止(zhi)時，減少液流(liu)沖(chong)擊(ji)所產生的(de)泵流(liu)水錘(chui)現象，節(jie)省(sheng)了系統維修費用； 
球磨(mo)機：利用(yong)電壓斜坡起動，減少齒(chi)輪轉矩的磨(mo)損，減少維(wei)修工作量延長使用(yong)壽(shou)命； 
風機(ji)：利用固態(tai)軟起動器(qi)取代了傳(chuan)統起動器(qi)，減少皮(pi)帶(dai)磨損和機(ji)械沖擊； 
壓縮機：利用限流(liu)，實現了(le)平滑起動，降低電機溫升； 
破碎機：利用堵(du)轉(zhuan)保(bao)護(hu)(hu)和(he)(he)快(kuai)速保(bao)護(hu)(hu)，避免機械故障和(he)(he)阻塞(sai)造成(cheng)電動機過熱(re)而燒毀； 
輸送(song)機(ji)械：利用軟起(qi)動和(he)軟停機(ji)控制，實現平滑漸進的(de)起(qi)動過程(cheng)和(he)平滑減速的(de)停車過程(cheng)，避免(mian)了(le)因沖擊而對物料和(he)設備造成的(de)損傷.