YD系(xi)列變(bian)(bian)極(ji)多速(su)(su)三相(xiang)異步電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)額(e)定電(dian)(dian)流為(wei)(wei)(wei)380V、額(e)定頻率為(wei)(wei)(wei)50HZ、防護等級(ji)(ji)為(wei)(wei)(wei)IP44、冷(leng)卻方法為(wei)(wei)(wei)IC411、采用(yong)B級(ji)(ji)絕緣，該系(xi)列電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)的(de)結構及安裝(zhuang)形式、外形尺(chi)寸與Y系(xi)列電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)相(xiang)同。 YD系(xi)列雙速(su)(su)電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)為(wei)(wei)(wei)單繞(rao)組(zu)，三速(su)(su)電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)為(wei)(wei)(wei)雙繞(rao)組(zu)。它是利用(yong)改變(bian)(bian)定子繞(rao)組(zu)的(de)接(jie)法以改變(bian)(bian)電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)的(de)級(ji)(ji)數，從而(er)使電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)用(yong)一套(tao)或(huo)兩(liang)(liang)套(tao)繞(rao)組(zu)來(lai)獲得兩(liang)(liang)種(zhong)或(huo)兩(liang)(liang)種(zhong)以上的(de)轉(zhuan)速(su)(su)。該系(xi)列電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)產(chan)品完全符合《YD系(xi)列（IP44）變(bian)(bian)極(ji)多速(su)(su)三相(xiang)異步電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)技術條件》，由于該系(xi)列電(dian)(dian)機(ji)(ji)(ji)具有可隨負載性(xing)質(zhi)的(de)要(yao)求而(er)分級(ji)(ji)地變(bian)(bian)換轉(zhuan)速(su)(su)，從而(er)達到功(gong)率的(de)合理匹(pi)配和(he)簡化變(bian)(bian)速(su)(su)系(xi)統的(de)特點。適用(yong)于需要(yao)逐級(ji)(ji)調速(su)(su)的(de)各(ge)種(zhong)傳(chuan)動(dong)(dong)機(ji)(ji)(ji)構，主(zhu)要(yao)應(ying)用(yong)于很多、組(zu)合、專用(yong)切削(xue)機(ji)(ji)(ji)床(chuang)及礦山冶(ye)金、紡織、印染、化工、農機(ji)(ji)(ji)等行業。