直流力矩電機的工作原理也(ye)與普通小(xiao)型直(zhi)流電(dian)(dian)(dian)(dian)(dian)機(ji)相同。其它激勵(li)(li)性直(zhi)流力(li)矩(ju)電(dian)(dian)(dian)(dian)(dian)機(ji)，如果磁(ci)場(chang)(chang)線(xian)圈(quan)(quan)(quan)借(jie)助(zhu)勵(li)(li)磁(ci)電(dian)(dian)(dian)(dian)(dian)流形成恒(heng)定磁(ci)場(chang)(chang)，當電(dian)(dian)(dian)(dian)(dian)樞(shu)(shu)(shu)線(xian)圈(quan)(quan)(quan)借(jie)助(zhu)電(dian)(dian)(dian)(dian)(dian)流時，產(chan)生電(dian)(dian)(dian)(dian)(dian)磁(ci)力(li)矩(ju)，使(shi)(shi)轉子(zi)旋轉，當磁(ci)場(chang)(chang)線(xian)圈(quan)(quan)(quan)和(he)(he)電(dian)(dian)(dian)(dian)(dian)樞(shu)(shu)(shu)線(xian)圈(quan)(quan)(quan)產(chan)生功率(lv)時，立即停止。借(jie)助(zhu)改變勵(li)(li)磁(ci)電(dian)(dian)(dian)(dian)(dian)流的(de)(de)(de)大小(xiao)和(he)(he)方(fang)(fang)向，能夠 改變電(dian)(dian)(dian)(dian)(dian)機(ji)的(de)(de)(de)速(su)度(du)(du)和(he)(he)轉向，滿(man)足伺服(fu)電(dian)(dian)(dian)(dian)(dian)機(ji)的(de)(de)(de)控制(zhi)(zhi)(zhi)(zhi)要求。在負載力(li)矩(ju)不(bu)變的(de)(de)(de)情況下(xia)，使(shi)(shi)電(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)壓(ya)不(bu)變，借(jie)助(zhu)改變勵(li)(li)磁(ci)電(dian)(dian)(dian)(dian)(dian)流來(lai)控制(zhi)(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)機(ji)的(de)(de)(de)速(su)度(du)(du)稱為磁(ci)場(chang)(chang)控制(zhi)(zhi)(zhi)(zhi)，使(shi)(shi)轉速(su)不(bu)變稱為電(dian)(dian)(dian)(dian)(dian)樞(shu)(shu)(shu)控制(zhi)(zhi)(zhi)(zhi)，借(jie)助(zhu)改變電(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)壓(ya)來(lai)控制(zhi)(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)動機(ji)。考(kao)慮到后(hou)面的(de)(de)(de)特點和(he)(he)精度(du)(du)比較理想，直(zhi)流力(li)矩(ju)電(dian)(dian)(dian)(dian)(dian)機(ji)一般采(cai)(cai)用(yong)電(dian)(dian)(dian)(dian)(dian)樞(shu)(shu)(shu)控制(zhi)(zhi)(zhi)(zhi)，即采(cai)(cai)用(yong)電(dian)(dian)(dian)(dian)(dian)樞(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)壓(ya)作(zuo)為控制(zhi)(zhi)(zhi)(zhi)信號電(dian)(dian)(dian)(dian)(dian)壓(ya)，而磁(ci)場(chang)(chang)控制(zhi)(zhi)(zhi)(zhi)方(fang)(fang)式(shi)僅適(shi)用(yong)于小(xiao)功率(lv)電(dian)(dian)(dian)(dian)(dian)機(ji)。

　　直(zhi)流(liu)(liu)力矩電(dian)(dian)(dian)機(ji)(ji)的基本工作原理與一般直(zhi)流(liu)(liu)電(dian)(dian)(dian)機(ji)(ji)相同。在勵(li)(li)磁(ci)(ci)繞(rao)組(zu)(zu)連接到(dao)恒(heng)定(ding)電(dian)(dian)(dian)壓時，電(dian)(dian)(dian)樞繞(rao)組(zu)(zu)接受(shou)控制(zhi)(zhi)電(dian)(dian)(dian)壓信號，接收(shou)控制(zhi)(zhi)電(dian)(dian)(dian)壓信號，并接收(shou)電(dian)(dian)(dian)流(liu)(liu)，以及(ji)電(dian)(dian)(dian)樞繞(rao)組(zu)(zu)產(chan)生的磁(ci)(ci)通(tong)(tong)與勵(li)(li)磁(ci)(ci)繞(rao)組(zu)(zu)產(chan)生的磁(ci)(ci)通(tong)(tong)相互(hu)作用，產(chan)生電(dian)(dian)(dian)磁(ci)(ci)力矩。借(jie)助(zhu)改變控制(zhi)(zhi)電(dian)(dian)(dian)壓信號的大小，能夠 改變電(dian)(dian)(dian)機(ji)(ji)的轉速，達到(dao)調速的目的。

　　使用伺服直(zhi)流力矩電(dian)機時應注意以(yi)下事項：

　　（1）使用電(dian)(dian)磁(ci)電(dian)(dian)樞控制的直流力矩(ju)電(dian)(dian)機時，應先接勵磁(ci)功率，再(zai)加電(dian)(dian)樞電(dian)(dian)壓。在運(yun)行中(zhong)，盡量避(bi)免勵磁(ci)繞組斷電(dian)(dian)，避(bi)免過電(dian)(dian)樞電(dian)(dian)流和電(dian)(dian)機超速。

　　②在選擇不同形式(shi)的電(dian)樞控制電(dian)源(yuan)時，注意其(qi)容量應留有適當的余量。