電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)（Motor）是(shi)把電(dian)(dian)(dian)(dian)(dian)(dian)能轉(zhuan)換成機(ji)械能的一種設備(bei)。它(ta)是(shi)利用(yong)通(tong)電(dian)(dian)(dian)(dian)(dian)(dian)線圈（也就是(shi)定(ding)子(zi)(zi)繞(rao)組）產生旋轉(zhuan)磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)并作用(yong)于轉(zhuan)子(zi)(zi)（如鼠籠式閉(bi)合鋁框）形(xing)成磁(ci)(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)力(li)(li)旋轉(zhuan)扭矩。電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)按使(shi)用(yong)電(dian)(dian)(dian)(dian)(dian)(dian)源不(bu)同分為直流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)和交流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)，電(dian)(dian)(dian)(dian)(dian)(dian)力(li)(li)系(xi)統中的電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)大部分是(shi)交流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)，可以是(shi)同步電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)或者(zhe)是(shi)異步電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)（電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)定(ding)子(zi)(zi)磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)轉(zhuan)速與轉(zhuan)子(zi)(zi)旋轉(zhuan)轉(zhuan)速不(bu)保(bao)持(chi)同步速）。電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)主要由定(ding)子(zi)(zi)與轉(zhuan)子(zi)(zi)組成，通(tong)電(dian)(dian)(dian)(dian)(dian)(dian)導線在磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)中受力(li)(li)運(yun)動(dong)的方向跟電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)方向和磁(ci)(ci)(ci)(ci)感(gan)線（磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)方向）方向有(you)關。電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)工作原理(li)是(shi)磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)對電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)受力(li)(li)的作用(yong)，使(shi)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)轉(zhuan)動(dong)。