三相異步電(dian)機同步電(dian)機是指電(dian)機轉子(zi)轉速(su)等于定子(zi)繞組產生的(de)磁場的(de)電(dian)磁轉速(su)，湖(hu)北(bei)冷卻塔電(dian)機廠(chang)家分享所以叫(jiao)同步電(dian)機!

異步電(dian)機是指轉子轉速不等于定子繞組產生的(de)磁場的(de)電(dian)磁轉速，故(gu)稱異步電(dian)機。

從理念上可見(jian)，同(tong)(tong)步(bu)電(dian)機轉(zhuan)速(su)恒定、同(tong)(tong)時電(dian)機轉(zhuan)速(su)等(deng)相當于定子繞(rao)組產生的(de)電(dian)磁(ci)轉(zhuan)速(su)，不隨負(fu)荷變化而(er)改變；而(er)異(yi)步(bu)電(dian)機的(de)實際轉(zhuan)速(su)低于同(tong)(tong)步(bu)（不同(tong)(tong)步(bu)），帶額定負(fu)荷時轉(zhuan)速(su)接(jie)近同(tong)(tong)步(bu)，隨著負(fu)荷增大而(er)會下降

為(wei)何異步電(dian)(dian)動(dong)機與(yu)同步電(dian)(dian)動(dong)機會(hui)(hui)有(you)這樣的(de)差異？根本(ben)的(de)原因其實是(shi)(shi)電(dian)(dian)動(dong)機的(de)定子(zi)是(shi)(shi)否(fou)存在(zai)勵磁(ci)性(xing)(xing)不強、不勵磁(ci)性(xing)(xing)不同步等問題(ti)，因為(wei)只有(you)產(chan)生相(xiang)對(dui)運(yun)動(dong)，才能起(qi)到切割磁(ci)感線(xian)的(de)作(zuo)用(yong)（或者(zhe)說是(shi)(shi)磁(ci)通變化(hua)），才會(hui)(hui)產(chan)生電(dian)(dian)磁(ci)感應力（也就是(shi)(shi)安培力），旋轉(zhuan)磁(ci)場(chang)與(yu)轉(zhuan)子(zi)存在(zai)相(xiang)對(dui)的(de)轉(zhuan)速(su)，也就是(shi)(shi)產(chan)生轉(zhuan)速(su)。而加了勵磁(ci)，定子(zi)就可以看作(zuo)一塊(kuai)磁(ci)鐵，有(you)固定的(de)NS極，本(ben)身產(chan)生固定方(fang)向(xiang)的(de)磁(ci)場(chang)，會(hui)(hui)隨著(zhu)旋轉(zhuan)磁(ci)場(chang)同步轉(zhuan)動(dong)，所以稱同步電(dian)(dian)機。（磁(ci)鐵的(de)吸(xi)引(yin)作(zuo)用(yong)）。

大部分異(yi)步(bu)電(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)只是用(yong)來做(zuo)電(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)，同步(bu)電(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)則(ze)是用(yong)來發(fa)電(dian)(dian)(dian)(dian)的(de)(de)。另外，由于異(yi)步(bu)電(dian)(dian)(dian)(dian)機(ji)(ji)(ji)結構簡單，制(zhi)造方便(bian)(bian)，價格便(bian)(bian)宜，運行(xing)方便(bian)(bian)等優(you)點(dian)，在實際(ji)的(de)(de)運用(yong)著(zhu)，異(yi)步(bu)電(dian)(dian)(dian)(dian)機(ji)(ji)(ji)也要(yao)廣泛許多，如(ru)在生產中應(ying)用(yong)的(de)(de)最(zui)為廣泛的(de)(de)Y系(xi)列三相異(yi)步(bu)電(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)就是普通異(yi)步(bu)電(dian)(dian)(dian)(dian)機(ji)(ji)(ji)的(de)(de)代表。