永(yong)(yong)(yong)磁(ci)(ci)(ci)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)機(ji)(ji)(ji)是(shi)用(yong)(yong)永(yong)(yong)(yong)磁(ci)(ci)(ci)體建(jian)立(li)磁(ci)(ci)(ci)場的(de)(de)一(yi)種(zhong)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)機(ji)(ji)(ji),有無(wu)電(dian)(dian)刷(shua)(shua)可分為永(yong)(yong)(yong)磁(ci)(ci)(ci)無(wu)刷(shua)(shua)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)機(ji)(ji)(ji)和(he)永(yong)(yong)(yong)磁(ci)(ci)(ci)有刷(shua)(shua)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)機(ji)(ji)(ji)。永(yong)(yong)(yong)磁(ci)(ci)(ci)無(wu)刷(shua)(shua)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)是(shi)由一(yi)塊或(huo)多塊永(yong)(yong)(yong)磁(ci)(ci)(ci)體建(jian)立(li)磁(ci)(ci)(ci)場的(de)(de)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji),其性能與(yu)恒定(ding)(ding)勵(li)磁(ci)(ci)(ci)電(dian)(dian)流(liu)(liu)(liu)(liu)(liu)的(de)(de)他勵(li)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)相似,可以由改變電(dian)(dian)樞電(dian)(dian)壓來方便地調(diao)速;有刷(shua)(shua)電(dian)(dian)機(ji)(ji)(ji)的(de)(de)定(ding)(ding)子上安(an)裝(zhuang)有固定(ding)(ding)的(de)(de)主磁(ci)(ci)(ci)極和(he)電(dian)(dian)刷(shua)(shua),轉子上安(an)裝(zhuang)有電(dian)(dian)樞繞(rao)組(zu)和(he)換(huan)向(xiang)器。直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)源的(de)(de)電(dian)(dian)能通過電(dian)(dian)刷(shua)(shua)和(he)換(huan)向(xiang)器進入(ru)電(dian)(dian)樞繞(rao)組(zu),產(chan)生電(dian)(dian)樞電(dian)(dian)流(liu)(liu)(liu)(liu)(liu),電(dian)(dian)樞電(dian)(dian)流(liu)(liu)(liu)(liu)(liu)產(chan)生的(de)(de)磁(ci)(ci)(ci)場與(yu)主磁(ci)(ci)(ci)場相互作用(yong)(yong)產(chan)生電(dian)(dian)磁(ci)(ci)(ci)轉矩,使電(dian)(dian)機(ji)(ji)(ji)旋轉帶動(dong)(dong)負載(zai)。隨(sui)著市場的(de)(de)發展,永(yong)(yong)(yong)磁(ci)(ci)(ci)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)機(ji)(ji)(ji)的(de)(de)應用(yong)(yong)會更多,原先(xian)用(yong)(yong)交流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)機(ji)(ji)(ji)的(de)(de)許多場合均被永(yong)(yong)(yong)磁(ci)(ci)(ci)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)機(ji)(ji)(ji)所替(ti)代。特別是(shi)出(chu)現(xian)永(yong)(yong)(yong)磁(ci)(ci)(ci)無(wu)刷(shua)(shua)電(dian)(dian)機(ji)(ji)(ji)后,永(yong)(yong)(yong)磁(ci)(ci)(ci)直(zhi)(zhi)(zhi)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)機(ji)(ji)(ji)的(de)(de)生產(chan)數量在不斷地上升。