力矩電機又稱扭矩電動機，它本質上是一個伺服電機的低速高扭矩，與我們熟悉的分類伺服電機，直流，幾種無刷直流，正弦交流溝通，改善轉矩，轉矩電動機的磁極，所以速度是一般一百轉到幾百轉。

　　轉矩(ju)電(dian)(dian)(dian)機的(de)(de)特(te)點(dian)(dian)是：負載(zai)增(zeng)(zeng)加(jia)時(shi)，電(dian)(dian)(dian)機轉速(su)自(zi)動下降，輸出轉矩(ju)增(zeng)(zeng)加(jia)，與負載(zai)保(bao)持平衡。因此(ci)，力(li)矩(ju)電(dian)(dian)(dian)機廣泛應用于(yu)需要(yao)(yao)精確(que)控制輸出力(li)矩(ju)的(de)(de)場(chang)合(he)。例如，在(zai)(zai)造紙、電(dian)(dian)(dian)線(xian)電(dian)(dian)(dian)纜等(deng)工業中，有(you)必(bi)(bi)要(yao)(yao)在(zai)(zai)卷(juan)(juan)(juan)(juan)(juan)筒（托盤）上(shang)纏(chan)繞(rao)(rao)(rao)產品(pin)(pin)。卷(juan)(juan)(juan)(juan)(juan)面(mian)直(zhi)(zhi)徑(jing)(jing)逐(zhu)漸增(zeng)(zeng)大(da)時(shi)，很重要(yao)(yao)的(de)(de)一(yi)點(dian)(dian)是在(zai)(zai)生產過程中要(yao)(yao)保(bao)持張力(li)不(bu)變，因為(wei)太緊，甚(shen)至會破(po)壞焊絲直(zhi)(zhi)徑(jing)(jing)，或造成產品(pin)(pin)厚(hou)度(du)不(bu)均(jun)勻(yun)，張力(li)過低(di)(di)會導(dao)致卷(juan)(juan)(juan)(juan)(juan)面(mian)松弛(chi)。為(wei)了在(zai)(zai)卷(juan)(juan)(juan)(juan)(juan)繞(rao)(rao)(rao)過程中保(bao)持張力(li)恒定(ding)，當產品(pin)(pin)卷(juan)(juan)(juan)(juan)(juan)繞(rao)(rao)(rao)到卷(juan)(juan)(juan)(juan)(juan)筒上(shang)的(de)(de)直(zhi)(zhi)徑(jing)(jing)增(zeng)(zeng)加(jia)時(shi)，需要(yao)(yao)增(zeng)(zeng)加(jia)驅動卷(juan)(juan)(juan)(juan)(juan)筒的(de)(de)電(dian)(dian)(dian)機的(de)(de)輸出力(li)矩(ju)。同時(shi)，為(wei)了保(bao)持產品(pin)(pin)繞(rao)(rao)(rao)組的(de)(de)線(xian)速(su)度(du)不(bu)變，必(bi)(bi)須相應地降低(di)(di)卷(juan)(juan)(juan)(juan)(juan)筒的(de)(de)轉速(su)。力(li)矩(ju)電(dian)(dian)(dian)機的(de)(de)機械特(te)性完全滿足這一(yi)要(yao)(yao)求(qiu)。

　　此(ci)外，在(zai)某些情況下，如(ru)電(dian)纜(lan)繞組(zu)的初始階段，必(bi)須維護的緊張關(guan)系，因此(ci)，汽車將(jiang)被阻塞，此(ci)時電(dian)動(dong)機(ji)(ji)(ji)(ji)(ji)本(ben)身會釋放(fang)出大量(liang)的熱(re)量(liang)，普通電(dian)動(dong)機(ji)(ji)(ji)(ji)(ji)由于(yu)散(san)熱(re)風扇和軸連接(jie)到電(dian)機(ji)(ji)(ji)(ji)(ji)不(bu)轉(zhuan)，很容易引起電(dian)機(ji)(ji)(ji)(ji)(ji)過熱(re)而燒壞。該(gai)轉(zhuan)矩電(dian)機(ji)(ji)(ji)(ji)(ji)具有高(gao)阻轉(zhuan)矩和小(xiao)阻轉(zhuan)矩電(dian)流。扭矩電(dian)機(ji)(ji)(ji)(ji)(ji)配有獨(du)立的軸流或(huo)離(li)心風機(ji)(ji)(ji)(ji)(ji)，可承受一定時間的閉鎖旋(xuan)轉(zhuan)運(yun)行。因此(ci)，力矩電(dian)機(ji)(ji)(ji)(ji)(ji)廣泛應用于(yu)紡織(zhi)、電(dian)線電(dian)纜(lan)、金屬加(jia)工、造紙、橡(xiang)膠、塑料、印刷機(ji)(ji)(ji)(ji)(ji)械等工業領域。

　　扭(niu)矩電(dian)機(ji)的(de)機(ji)械特性在現(xian)代伺服(fu)驅(qu)動(dong)(dong)(dong)(dong)裝(zhuang)(zhuang)置(zhi)(zhi)的(de)控制(zhi)下可以(yi)實現(xian)更高的(de)剛度(du)，其內部編碼器可以(yi)實現(xian)編碼器級的(de)精度(du)，因此可以(yi)取代原有(you)(you)的(de)機(ji)械驅(qu)動(dong)(dong)(dong)(dong)裝(zhuang)(zhuang)置(zhi)(zhi)實現(xian)直接驅(qu)動(dong)(dong)(dong)(dong)。目前已經有(you)(you)以(yi)扭(niu)矩電(dian)機(ji)為核心(xin)動(dong)(dong)(dong)(dong)力元(yuan)件的(de)數(shu)控轉(zhuan)臺等產(chan)品。這(zhe)些產(chan)品在體積功(gong)率比(bi)方面不如機(ji)械傳(chuan)(chuan)動(dong)(dong)(dong)(dong)裝(zhuang)(zhuang)置(zhi)(zhi)。但由于(yu)其無(wu)傳(chuan)(chuan)動(dong)(dong)(dong)(dong)間(jian)隙、無(wu)磨(mo)損、傳(chuan)(chuan)動(dong)(dong)(dong)(dong)精度(du)和效率高的(de)優點，可以(yi)有(you)(you)效地解決傳(chuan)(chuan)統(tong)伺服(fu)電(dian)機(ji)加蝸輪(lun)傳(chuan)(chuan)動(dong)(dong)(dong)(dong)或蝸輪(lun)傳(chuan)(chuan)動(dong)(dong)(dong)(dong)裝(zhuang)(zhuang)置(zhi)(zhi)，在精密設(she)備中得到越來越多(duo)的(de)推廣(guang)和應用。