按(an)勵(li)磁(ci)(ci)線(xian)(xian)圈的(de)(de)供電方(fang)式(shi)分為：磁(ci)(ci)粉離合器、磁(ci)(ci)粉制動(dong)器有(you)兩大(da)類(lei)產品。采用方(fang)式(shi)有(you)：線(xian)(xian)圈旋轉(zhuan)式(shi)和線(xian)(xian)圈靜(jing)止式(shi)。線(xian)(xian)圈旋轉(zhuan)式(shi)旋轉(zhuan)線(xian)(xian)圈的(de)(de)供電是經過安裝在(zai)軸上(shang)的(de)(de)滑(hua)環(huan)進行(xing)的(de)(de)，由于接電方(fang)式(shi)的(de)(de)不(bu)可靠(kao)和線(xian)(xian)圈在(zai)高(gao)速(su)旋轉(zhuan)過程中有(you)可能發生的(de)(de)不(bu)平衡引起震動(dong)，這種類(lei)型的(de)(de)產品已經很少應用，目前市(shi)場上(shang)的(de)(de)絕大(da)部(bu)分產品都采用線(xian)(xian)圈靜(jing)止型的(de)(de)。

　　線(xian)圈靜止(zhi)(zhi)型(xing)產(chan)品又有外(wai)殼(ke)靜止(zhi)(zhi)和(he)外(wai)殼(ke)旋(xuan)轉(zhuan)(zhuan)二種(zhong)類型(xing)。對于(yu)(yu)外(wai)殼(ke)靜止(zhi)(zhi)的產(chan)品，靜止(zhi)(zhi)線(xian)圈位(wei)于(yu)(yu)轉(zhuan)(zhuan)子(zi)的外(wai)部，對于(yu)(yu)外(wai)殼(ke)旋(xuan)轉(zhuan)(zhuan)的產(chan)品，靜止(zhi)(zhi)線(xian)圈位(wei)于(yu)(yu)轉(zhuan)(zhuan)子(zi)的內部。根據輸出轉(zhuan)(zhuan)子(zi)工作面的形(xing)(xing)狀不同，常用(yong)(yong)(yong)的產(chan)品有圓柱(zhu)形(xing)(xing)轉(zhuan)(zhuan)子(zi)、杯(bei)(bei)形(xing)(xing)轉(zhuan)(zhuan)子(zi)和(he)盤形(xing)(xing)轉(zhuan)(zhuan)子(zi)之(zhi)分。圓柱(zhu)形(xing)(xing)轉(zhuan)(zhuan)子(zi)一般用(yong)(yong)(yong)于(yu)(yu)大(da)中型(xing)產(chan)品，結構比較(jiao)簡單;杯(bei)(bei)形(xing)(xing)轉(zhuan)(zhuan)子(zi)一般用(yong)(yong)(yong)于(yu)(yu)外(wai)殼(ke)旋(xuan)轉(zhuan)(zhuan)型(xing)產(chan)品，散熱(re)好，滑差功率較(jiao)大(da);而盤形(xing)(xing)轉(zhuan)(zhuan)子(zi)一般用(yong)(yong)(yong)于(yu)(yu)微型(xing)產(chan)品，適用(yong)(yong)(yong)于(yu)(yu)精密(mi)控制場合(he)。

　　磁(ci)(ci)粉制動器(qi)作(zuo)(zuo)為(wei)執行(xing)元件，在張(zhang)(zhang)力(li)控制系統中有著(zhu)不可替代的作(zuo)(zuo)用。 在卷繞(rao)恒(heng)張(zhang)(zhang)力(li)控制中，若要(yao)(yao)(yao)求(qiu)張(zhang)(zhang)力(li)保(bao)持恒(heng)定，則要(yao)(yao)(yao)求(qiu)卷繞(rao)轉矩隨卷繞(rao)半(ban)徑(jing)(jing)正(zheng)比(bi)變化(hua)，即要(yao)(yao)(yao)磁(ci)(ci)粉制動器(qi)的勵(li)磁(ci)(ci)電流(liu)隨半(ban)徑(jing)(jing)正(zheng)比(bi)變化(hua)。為(wei)此(ci)，采用張(zhang)(zhang)力(li)檢測裝(zhuang)(zhuang)置(zhi)或(huo)半(ban)徑(jing)(jing)反饋裝(zhuang)(zhuang)置(zhi)或(huo)長度計量裝(zhuang)(zhuang)置(zhi)來檢測張(zhang)(zhang)力(li)或(huo)卷材半(ban)徑(jing)(jing)的實時變化(hua)值，經控制裝(zhuang)(zhuang)置(zhi)為(wei)磁(ci)(ci)粉離合(he)器(qi)提(ti)供勵(li)磁(ci)(ci)電流(liu)，通過控制磁(ci)(ci)粉制動器(qi)輸出扭矩來使張(zhang)(zhang)力(li)保(bao)持恒(heng)定。