三相異步(bu)電(dian)(dian)動(dong)(dong)機(ji)(ji)在直(zhi)接啟(qi)動(dong)(dong)時，啟(qi)動(dong)(dong)電(dian)(dian)流一(yi)(yi)般(ban)比較(jiao)大，是其(qi)額定電(dian)(dian)流的(de)(de)(de)4-7倍，直(zhi)接啟(qi)動(dong)(dong)時會(hui)對電(dian)(dian)機(ji)(ji)內部(bu)和(he)電(dian)(dian)網產(chan)生較(jiao)大的(de)(de)(de)沖(chong)擊，嚴重(zhong)時會(hui)引起(qi)其(qi)他設備的(de)(de)(de)停機(ji)(ji)和(he)故障，因(yin)此，除(chu)了(le)小(xiao)容量(liang)的(de)(de)(de)電(dian)(dian)機(ji)(ji)采用直(zhi)接啟(qi)動(dong)(dong)外，大容量(liang)的(de)(de)(de)電(dian)(dian)機(ji)(ji)一(yi)(yi)般(ban)都采取降壓啟(qi)動(dong)(dong)，傳(chuan)統的(de)(de)(de)降壓啟(qi)動(dong)(dong)的(de)(de)(de)方法有(you)：定子電(dian)(dian)路(lu)串電(dian)(dian)阻（電(dian)(dian)抗）降壓啟(qi)動(dong)(dong)；Y-△降壓啟(qi)動(dong)(dong)，串自耦變壓器(qi)降壓啟(qi)動(dong)(dong)等，傳(chuan)統減(jian)壓啟(qi)動(dong)(dong)雖然成本投入(ru)少，但是弊(bi)端(duan)也很(hen)突出，線(xian)路(lu)復雜，對電(dian)(dian)網、機(ji)(ji)械的(de)(de)(de)沖(chong)擊比較(jiao)大，降低設備使(shi)用壽命，增加(jia)維護(hu)量(liang)，隨著技術(shu)(shu)的(de)(de)(de)發展，軟起(qi)動(dong)(dong)技術(shu)(shu)的(de)(de)(de)出現，軟起(qi)動(dong)(dong)器(qi)的(de)(de)(de)出現，使(shi)得電(dian)(dian)機(ji)(ji)的(de)(de)(de)啟(qi)動(dong)(dong)克服傳(chuan)統降壓啟(qi)動(dong)(dong)的(de)(de)(de)弊(bi)端(duan)，軟起(qi)動(dong)(dong)器(qi)具有(you)的(de)(de)(de)一(yi)(yi)些優良的(de)(de)(de)啟(qi)動(dong)(dong)特性，受(shou)到了(le)越來越多的(de)(de)(de)用戶的(de)(de)(de)青睞。

軟起動(dong)器(qi)的主要特點(dian)

1、軟起動功(gong)能

2、軟(ruan)停車功能

3、多功能保護(hu)

4、用在水泵類負載上能有效(xiao)防(fang)止“水錘”效(xiao)應