由于世界(jie)各國電(dian)網指標不(bu)統一，出口電(dian)器(qi)廠商需要電(dian)源模擬不(bu)同國家(jia)的(de)(de)電(dian)網狀況，為工程(cheng)師在設計開發(fa)、生產(chan)線測(ce)(ce)試及品保的(de)(de)產(chan)品檢測(ce)(ce)、壽命、過高壓(ya)(ya)/低壓(ya)(ya)模擬測(ce)(ce)試等應用(yong)中提(ti)供(gong)純(chun)凈可靠的(de)(de)、低諧波(bo)失真、高穩定的(de)(de)頻率(lv)和(he)穩壓(ya)(ya)率(lv)的(de)(de)正弦(xian)波(bo)電(dian)力輸(shu)出。

一般，把(ba)電(dian)(dian)(dian)壓(ya)和頻率(lv)固定不動(dong)(dong)(dong)不會改變的(de)(de)(de)(de)交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)轉換(huan)為(wei)電(dian)(dian)(dian)壓(ya)或頻率(lv)可(ke)變性的(de)(de)(de)(de)交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)的(de)(de)(de)(de)設(she)備稱之為(wei)“軟(ruan)(ruan)(ruan)(ruan)啟(qi)動(dong)(dong)(dong)器”。該機(ji)器設(she)備{zx0}要把(ba)三相(xiang)或單相(xiang)交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)轉換(huan)為(wei)交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)（DC）。隨(sui)后再把(ba)交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)（DC）轉換(huan)為(wei)三相(xiang)或單相(xiang)交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)（AC）。軟(ruan)(ruan)(ruan)(ruan)啟(qi)動(dong)(dong)(dong)器另(ling)外更改輸(shu)出(chu)頻率(lv)與電(dian)(dian)(dian)壓(ya)，也就是(shi)說更改了(le)電(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)運(yun)作(zuo)(zuo)曲(qu)線圖(tu)上的(de)(de)(de)(de)n0，使電(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)運(yun)作(zuo)(zuo)曲(qu)線圖(tu)平行面下沉。因(yin)而軟(ruan)(ruan)(ruan)(ruan)啟(qi)動(dong)(dong)(dong)器能夠使電(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)以較小(xiao)的(de)(de)(de)(de)起(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)(liu)量，得到(dao)很大的(de)(de)(de)(de)起(qi)動(dong)(dong)(dong)轉距，即軟(ruan)(ruan)(ruan)(ruan)啟(qi)動(dong)(dong)(dong)器能夠起(qi)動(dong)(dong)(dong)輕載負載。軟(ruan)(ruan)(ruan)(ruan)啟(qi)動(dong)(dong)(dong)器具備變壓(ya)、調頻、穩壓(ya)管、變速等基(ji)本要素，運(yun)用了(le)當代的(de)(de)(de)(de)科技(ji)進(jin)步，價格比較貴但特(te)性優良，內部構造繁瑣但應用簡易(yi)，因(yin)此不僅(jin)僅(jin)用以起(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)機(ji)，只是(shi)普遍的(de)(de)(de)(de)運(yun)用到(dao)各(ge)(ge)行各(ge)(ge)業，各(ge)(ge)式(shi)各(ge)(ge)樣(yang)的(de)(de)(de)(de)輸(shu)出(chu)功率(lv)、各(ge)(ge)式(shi)各(ge)(ge)樣(yang)的(de)(de)(de)(de)外觀(guan)設(she)計、各(ge)(ge)式(shi)各(ge)(ge)樣(yang)的(de)(de)(de)(de)容積、各(ge)(ge)式(shi)各(ge)(ge)樣(yang)的(de)(de)(de)(de)主要用途等常有。隨(sui)之技(ji)術性的(de)(de)(de)(de)發展趨勢(shi)，成本費(fei)的(de)(de)(de)(de)減(jian)少，軟(ruan)(ruan)(ruan)(ruan)啟(qi)動(dong)(dong)(dong)器一定還會獲得更普遍的(de)(de)(de)(de)運(yun)用。軟(ruan)(ruan)(ruan)(ruan)啟(qi)動(dong)(dong)(dong)器是(shi)一個驅動(dong)(dong)(dong)器系統軟(ruan)(ruan)(ruan)(ruan)件中的(de)(de)(de)(de)一部份，在其中關鍵(jian)的(de)(de)(de)(de)部件包含交(jiao)流(liu)(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)機(ji)、驅動(dong)(dong)(dong)器控(kong)制板(ban)（即軟(ruan)(ruan)(ruan)(ruan)啟(qi)動(dong)(dong)(dong)器）自(zi)身及其軟(ruan)(ruan)(ruan)(ruan)啟(qi)動(dong)(dong)(dong)器的(de)(de)(de)(de)實際操作(zuo)(zuo)插口。

軟啟動器(qi)(qi)(qi)(qi)所驅(qu)(qu)動器(qi)(qi)(qi)(qi)的(de)(de)(de)交(jiao)流電(dian)(dian)機(ji)(ji)(ji)一(yi)般(ban)是(shi)三(san)相磁感應電(dian)(dian)機(ji)(ji)(ji)，一(yi)些軟啟動器(qi)(qi)(qi)(qi)能夠驅(qu)(qu)動器(qi)(qi)(qi)(qi)單相電(dian)(dian)動機(ji)(ji)(ji)或(huo)獨特的(de)(de)(de)同步電(dian)(dian)動機(ji)(ji)(ji)應用，但關鍵仍然以驅(qu)(qu)動器(qi)(qi)(qi)(qi)三(san)相磁感應電(dian)(dian)機(ji)(ji)(ji)主導，在(zai)成(cheng)本費上(shang)也(ye)較為劃算。一(yi)般(ban)總會用軟啟動器(qi)(qi)(qi)(qi)驅(qu)(qu)動器(qi)(qi)(qi)(qi)為定(ding)速驅(qu)(qu)動器(qi)(qi)(qi)(qi)而(er)(er)設(she)計(ji)(ji)方案(an)的(de)(de)(de)磁感應電(dian)(dian)機(ji)(ji)(ji)，但是(shi)軟啟動器(qi)(qi)(qi)(qi)驅(qu)(qu)動器(qi)(qi)(qi)(qi)磁感應電(dian)(dian)機(ji)(ji)(ji)時，其電(dian)(dian)壓地應力也(ye)會提升(sheng)，因而(er)(er)一(yi)般(ban)會提議采用為軟啟動器(qi)(qi)(qi)(qi)驅(qu)(qu)動器(qi)(qi)(qi)(qi)而(er)(er)設(she)計(ji)(ji)方案(an)的(de)(de)(de)變頻電(dian)(dian)動機(ji)(ji)(ji)，且需合乎(hu)NEMA規范MG-1的(de)(de)(de)Part31，也(ye)就是(shi)說電(dian)(dian)機(ji)(ji)(ji)在(zai)沒有噪音濾波器(qi)(qi)(qi)(qi)或(huo)串聯電(dian)(dian)抗器(qi)(qi)(qi)(qi)的(de)(de)(de)標準(zhun)下，能夠承擔尺寸為額定(ding)值電(dian)(dian)壓3.1倍，上(shang)升(sheng)時間(jian)不(bu)低于0.1μs的(de)(de)(de)電(dian)(dian)壓。

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