YD系(xi)列變(bian)(bian)極多速(su)三相(xiang)(xiang)異步(bu)電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)額定電(dian)(dian)(dian)流為(wei)380V、額定頻(pin)率(lv)(lv)為(wei)50HZ、防護等(deng)級(ji)(ji)(ji)為(wei)IP44、冷卻方法(fa)為(wei)IC411、采用(yong)B級(ji)(ji)(ji)絕緣，該系(xi)列電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)的(de)(de)結構(gou)及(ji)安裝形式、外形尺寸與Y系(xi)列電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)相(xiang)(xiang)同。 YD系(xi)列雙(shuang)速(su)電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)為(wei)單繞組(zu)(zu)，三速(su)電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)為(wei)雙(shuang)繞組(zu)(zu)。它是利用(yong)改變(bian)(bian)定子繞組(zu)(zu)的(de)(de)接法(fa)以(yi)改變(bian)(bian)電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)的(de)(de)級(ji)(ji)(ji)數，從(cong)而(er)使電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)用(yong)一套或兩套繞組(zu)(zu)來獲得兩種或兩種以(yi)上的(de)(de)轉速(su)。該系(xi)列電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)產(chan)品完(wan)全符合(he)《YD系(xi)列（IP44）變(bian)(bian)極多速(su)三相(xiang)(xiang)異步(bu)電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)技術條件》，由于該系(xi)列電(dian)(dian)(dian)機(ji)(ji)(ji)具有可(ke)隨負載性質的(de)(de)要(yao)求而(er)分級(ji)(ji)(ji)地(di)變(bian)(bian)換轉速(su)，從(cong)而(er)達到功率(lv)(lv)的(de)(de)合(he)理匹配和簡化(hua)變(bian)(bian)速(su)系(xi)統的(de)(de)特點。適用(yong)于需要(yao)逐級(ji)(ji)(ji)調速(su)的(de)(de)各種傳動(dong)(dong)機(ji)(ji)(ji)構(gou)，主要(yao)應用(yong)于很多、組(zu)(zu)合(he)、專用(yong)切(qie)削機(ji)(ji)(ji)床及(ji)礦山冶金、紡織(zhi)、印染、化(hua)工(gong)、農機(ji)(ji)(ji)等(deng)行業。