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?常(chang)規做法是M，△，Y三個一(yi)樣大，容量取電機額定電流值相近的(de)規格。

比如37kw電機，額(e)定電流(liu)約72A左右，可選三個成品(pin)的65A的接觸器。因為(wei)是(shi)雙(shuang)路供電，所以65A足夠了。

省錢(qian)的(de)(de)做(zuo)法(fa)有兩種，一(yi)(yi)是(shi)把星形(xing)接觸器的(de)(de)容(rong)量降一(yi)(yi)檔，比如上面的(de)(de)用50A的(de)(de)。另一(yi)(yi)種是(shi)三(san)個(ge)都往下降一(yi)(yi)檔，只要(yao)容(rong)量超過(guo)電(dian)機電(dian)流的(de)(de)一(yi)(yi)半以上就可用。

比如37kw，可(ke)(ke)以(yi)三(san)個都用50A的(de)。極(ji)限條件下甚至可(ke)(ke)以(yi)用到40~45A的(de)接觸器，但壽命(ming)不長。

星三(san)角降(jiang)壓啟動原理(li)電路圖(tu)

1.當負載(zai)對電(dian)動(dong)機啟動(dong)力矩無嚴格要求又要限制電(dian)動(dong)機啟動(dong)電(dian)流且電(dian)機滿足(zu)380V/Δ接(jie)線條件才能采(cai)用星三角啟動(dong)方(fang)法； 

2.該方(fang)法是(shi)：在電(dian)機(ji)啟(qi)動(dong)時(shi)將電(dian)機(ji)接(jie)成(cheng)(cheng)星型接(jie)線(xian),當電(dian)機(ji)啟(qi)動(dong)成(cheng)(cheng)功(gong)后再將電(dian)機(ji)改接(jie)成(cheng)(cheng)三(san)角型接(jie)線(xian)（通過雙投開關迅速切換）； 

3.因電(dian)機啟(qi)動(dong)電(dian)流(liu)與(yu)電(dian)源電(dian)壓成正比,此時(shi)電(dian)網提(ti)供的(de)(de)啟(qi)動(dong)電(dian)流(liu)只(zhi)有(you)全(quan)電(dian)壓啟(qi)動(dong)電(dian)流(liu)的(de)(de)1/3 ，但啟(qi)動(dong)力(li)矩也只(zhi)有(you)全(quan)電(dian)壓啟(qi)動(dong)力(li)矩的(de)(de)1/3。

星(xing)(xing)三(san)角(jiao)啟(qi)(qi)(qi)動(dong)(dong)，屬降壓(ya)(ya)啟(qi)(qi)(qi)動(dong)(dong)他是(shi)以犧(xi)牲功(gong)率為代(dai)價來換取降低啟(qi)(qi)(qi)動(dong)(dong)電(dian)(dian)流來實現的(de)。所以不能一(yi)概而以電(dian)(dian)機(ji)功(gong)率的(de)大小來確定(ding)(ding)是(shi)否需采(cai)用(yong)(yong)星(xing)(xing)三(san)角(jiao)啟(qi)(qi)(qi)動(dong)(dong)，還的(de)看是(shi)什么(me)樣的(de)負(fu)載(zai)，一(yi)般在需要啟(qi)(qi)(qi)動(dong)(dong)時(shi)(shi)負(fu)載(zai)輕運行時(shi)(shi)負(fu)載(zai)重尚可采(cai)用(yong)(yong)星(xing)(xing)三(san)角(jiao)啟(qi)(qi)(qi)動(dong)(dong)，一(yi)般情況(kuang)下鼠籠(long)型電(dian)(dian)機(ji)的(de)啟(qi)(qi)(qi)動(dong)(dong)電(dian)(dian)流是(shi)運行電(dian)(dian)流的(de)5—7倍，而對電(dian)(dian)網的(de)電(dian)(dian)壓(ya)(ya)要求一(yi)般是(shi)正負(fu)10%（我記憶中）為了不形成對電(dian)(dian)網電(dian)(dian)壓(ya)(ya)過(guo)大的(de)沖擊(ji)所以要采(cai)用(yong)(yong)星(xing)(xing)三(san)角(jiao)啟(qi)(qi)(qi)動(dong)(dong)，一(yi)般要求在鼠籠(long)型電(dian)(dian)機(ji)的(de)功(gong)率超過(guo)變壓(ya)(ya)器額定(ding)(ding)功(gong)率的(de)10%時(shi)(shi)就要采(cai)用(yong)(yong)星(xing)(xing)三(san)角(jiao)啟(qi)(qi)(qi)動(dong)(dong)。