什么電(dian)(dian)動(dong)機(ji)(ji)(ji)？電(dian)(dian)動(dong)機(ji)(ji)(ji)是(shi)把電(dian)(dian)能轉(zhuan)換成機(ji)(ji)(ji)械能的(de)(de)一(yi)種設備。它(ta)是(shi)利用通(tong)電(dian)(dian)線圈（也就是(shi)定(ding)子繞(rao)組(zu)）產生旋轉(zhuan)磁(ci)(ci)場(chang)作用于轉(zhuan)子（如鼠籠(long)式閉合鋁框(kuang)）形成磁(ci)(ci)電(dian)(dian)動(dong)力旋轉(zhuan)扭矩。電(dian)(dian)動(dong)機(ji)(ji)(ji)按使(shi)用電(dian)(dian)源(yuan)不同(tong)分直流(liu)電(dian)(dian)動(dong)機(ji)(ji)(ji)和(he)交流(liu)電(dian)(dian)動(dong)機(ji)(ji)(ji)，電(dian)(dian)力系統中的(de)(de)電(dian)(dian)動(dong)機(ji)(ji)(ji)大(da)部分是(shi)交流(liu)電(dian)(dian)機(ji)(ji)(ji)，可以是(shi)同(tong)步電(dian)(dian)機(ji)(ji)(ji)或(huo)者是(shi)異步電(dian)(dian)機(ji)(ji)(ji)（電(dian)(dian)機(ji)(ji)(ji)定(ding)子磁(ci)(ci)場(chang)轉(zhuan)速(su)與(yu)轉(zhuan)子旋轉(zhuan)轉(zhuan)速(su)不保持同(tong)步速(su)）電(dian)(dian)動(dong)機(ji)(ji)(ji)主(zhu)要(yao)由(you)定(ding)子與(yu)轉(zhuan)子組(zu)成，通(tong)電(dian)(dian)導(dao)線在磁(ci)(ci)場(chang)中受力運動(dong)的(de)(de)方向(xiang)跟電(dian)(dian)流(liu)方向(xiang)和(he)磁(ci)(ci)感線（磁(ci)(ci)場(chang)方向(xiang)）方向(xiang)有關(guan)。電(dian)(dian)動(dong)機(ji)(ji)(ji)工(gong)作原理是(shi)磁(ci)(ci)場(chang)對電(dian)(dian)流(liu)受力的(de)(de)作用，使(shi)電(dian)(dian)動(dong)機(ji)(ji)(ji)轉(zhuan)動(dong)。