磁粉制動器是電梯(ti)重要的(de)安全裝置，磁(ci)粉制動(dong)器(qi)的(de)安全、可靠是保證電梯(ti)安全運行的(de)重要因素之(zhi)一(yi)。

　　磁粉制動器施加制(zhi)(zhi)動(dong)(dong)(dong)力的機械部件(jian)--制(zhi)(zhi)動(dong)(dong)(dong)彈(dan)(dan)簧和(he)拉(la)(la)桿(gan)均(jun)只(zhi)有(you)一組(zu)，一旦損壞(huai)，制(zhi)(zhi)動(dong)(dong)(dong)器(qi)(qi)就(jiu)會失(shi)靈;而兩(liang)個(ge)銜(xian)鐵(tie)也不(bu)是完全(quan)獨(du)立的，若剩磁(ci)太(tai)大，就(jiu)可能(neng)導致制(zhi)(zhi)動(dong)(dong)(dong)器(qi)(qi)失(shi)效。磁(ci)粉制(zhi)(zhi)動(dong)(dong)(dong)器(qi)(qi)的制(zhi)(zhi)動(dong)(dong)(dong)彈(dan)(dan)簧和(he)拉(la)(la)桿(gan)也均(jun)只(zhi)有(you)一組(zu)，如有(you)損壞(huai)則制(zhi)(zhi)動(dong)(dong)(dong)器(qi)(qi)完全(quan)失(shi)效。雖然磁(ci)粉制(zhi)(zhi)動(dong)(dong)(dong)器(qi)(qi)制(zhi)(zhi)動(dong)(dong)(dong)彈(dan)(dan)簧和(he)拉(la)(la)桿(gan)是分兩(liang)組(zu)裝設(she)的，但電磁(ci)鐵(tie)中銜(xian)鐵(tie)只(zhi)有(you)一個(ge)，若發生(sheng)卡阻不(bu)能(neng)復位(wei)，則磁(ci)粉制(zhi)(zhi)動(dong)(dong)(dong)器(qi)(qi)會失(shi)效。

　　轎廂的(de)(de)減速度不應(ying)超(chao)過(guo)安全鉗動(dong)(dong)作或(huo)轎廂撞擊緩沖(chong)器所(suo)產生的(de)(de)減速度。所(suo)有(you)參與向制(zhi)動(dong)(dong)輪或(huo)盤施加制(zhi)動(dong)(dong)力(li)的(de)(de)磁粉制(zhi)動(dong)(dong)器機械(xie)部(bu)(bu)件應(ying)分兩(liang)組(zu)裝設。若(ruo)一組(zu)部(bu)(bu)件不起作用，應(ying)該仍有(you)足夠(gou)的(de)(de)制(zhi)動(dong)(dong)力(li)使載(zai)有(you)額(e)定載(zai)荷以額(e)定速度下(xia)行的(de)(de)轎廂減速下(xia)行。電(dian)磁線圈的(de)(de)鐵心被(bei)視為機械(xie)部(bu)(bu)件，而線圈則不是。

　　雙(shuang)向推力(li)電(dian)梯(ti)制(zhi)(zhi)(zhi)動(dong)(dong)器(qi)是通電(dian)時(shi)產生雙(shuang)向電(dian)磁(ci)推力(li)，使(shi)剎車機(ji)(ji)構與電(dian)機(ji)(ji)旋轉(zhuan)部分脫離(即釋(shi)放(fang))，斷電(dian)時(shi)電(dian)磁(ci)力(li)消失，在外加制(zhi)(zhi)(zhi)動(dong)(dong)彈簧壓力(li)的(de)作(zuo)用下，形成失電(dian)制(zhi)(zhi)(zhi)動(dong)(dong)的(de)摩擦(ca)式制(zhi)(zhi)(zhi)動(dong)(dong)器(qi)(以下簡稱制(zhi)(zhi)(zhi)動(dong)(dong)器(qi))。它(ta)主要與自(zi)動(dong)(dong)扶梯(ti)曳引機(ji)(ji)上的(de)驅(qu)動(dong)(dong)電(dian)機(ji)(ji)配套成自(zi)動(dong)(dong)扶梯(ti)用電(dian)磁(ci)制(zhi)(zhi)(zhi)動(dong)(dong)三(san)相異步電(dian)動(dong)(dong)機(ji)(ji)，廣(guang)泛(fan)適用于能實現(xian)平穩停車和快速起動(dong)(dong)及在斷電(dian)時(shi)安全(防險)制(zhi)(zhi)(zhi)動(dong)(dong)的(de)場合(he)。

　　磁粉制動器具有結(jie)構(gou)緊湊(cou)、安裝方便、噪(zao)音低、振(zhen)動小、電磁推力大、動作靈敏，制(zhi)動可靠等優點，是(shi)一種理想的自動化控制(zhi)執行元件。