磁(ci)(ci)粉(fen)制(zhi)動(dong)(dong)(dong)器在(zai)(zai)同滑差無關(guan)的(de)(de)環境下(xia)，可以轉(zhuan)達肯定的(de)(de)轉(zhuan)矩，具有(you)相(xiang)應速(su)度快、布局簡(jian)單、無污染、無噪(zao)音、無打擊振動(dong)(dong)(dong)節省能源等(deng)好處(chu)。磁(ci)(ci)粉(fen)制(zhi)動(dong)(dong)(dong)器還經常被(bei)用(yong)于(yu)傳動(dong)(dong)(dong)呆板的(de)(de)測功(gong)加(jia)(jia)載和制(zhi)動(dong)(dong)(dong)等(deng)，普(pu)遍應用(yong)于(yu)造(zao)紙(zhi)、印刷、 塑料、橡(xiang)膠、紡織、印染、電(dian)(dian)線電(dian)(dian)纜、冶金、壓片機(ji)以及其(qi)他(ta)有(you)關(guan)卷取加(jia)(jia)工行業中的(de)(de)放卷和收卷張力控(kong)制(zhi)。磁(ci)(ci)粉(fen)制(zhi)動(dong)(dong)(dong)器安裝(zhuang)使用(yong)是(shi)一(yi)種多用(yong)途、性能良好的(de)(de)自動(dong)(dong)(dong)控(kong)制(zhi)元件，是(shi)接(jie)納磁(ci)(ci)粉(fen)作介(jie)質，在(zai)(zai)通(tong)電(dian)(dian)環境下(xia)形成(cheng)磁(ci)(ci)粉(fen)鏈來轉(zhuan)達扭矩的(de)(de)新型(xing)傳動(dong)(dong)(dong)元件，緊張由內轉(zhuan)子、外(wai)轉(zhuan)子、激(ji)磁(ci)(ci)線圈及磁(ci)(ci)粉(fen)組成(cheng)。

　當線圈不通(tong)電時主(zhu)動(dong)(dong)轉子旋轉由于離心力的(de)作用(yong)(yong)，磁(ci)粉(fen)(fen)(fen)制(zhi)(zhi)動(dong)(dong)器被甩在(zai)主(zhu)動(dong)(dong)轉子的(de)內壁上，磁(ci)粉(fen)(fen)(fen)與從動(dong)(dong)轉子之間沒有打仗，主(zhu)動(dong)(dong)轉子空轉。接(jie)通(tong)直(zhi)流電源后孕育產生電磁(ci)場，介質(zhi)磁(ci)粉(fen)(fen)(fen)在(zai)磁(ci)力線作用(yong)(yong)下形(xing)成磁(ci)粉(fen)(fen)(fen)鏈，把內轉子、外(wai)轉子聯接(jie)起來，從而到達(da)轉達(da)，制(zhi)(zhi)動(dong)(dong)扭矩的(de)目的(de)。磁(ci)粉(fen)(fen)(fen)制(zhi)(zhi)動(dong)(dong)器的(de)選型一(yi)樣平(ping)常以所需(xu)轉達(da)最大轉矩為依據來選定，并(bing)同時過細(xi)包管實(shi)際滑(hua)差功(gong)率(lv)小于磁(ci)粉(fen)(fen)(fen)離合(he)器、制(zhi)(zhi)動(dong)(dong)器的(de)容(rong)許滑(hua)差功(gong)率(lv)。磁(ci)粉(fen)(fen)(fen)制(zhi)(zhi)動(dong)(dong)器在(zai)散(san)熱條件肯定時，其(qi)滑(hua)差功(gong)率(lv)是(shi)肯定值，因(yin)此其(qi)實(shi)際事(shi)情轉矩與轉速(su)可(ke)以相互補償，即滑(hua)差轉速(su)提(ti)高(gao)時，則(ze)許用(yong)(yong)轉矩將(jiang)相應降落，但最高(gao)轉速(su)不得高(gao)于其(qi)允許轉速(su)。