伺服(fu)(fu)(fu)系統(tong)是(shi)使(shi)物(wu)體(ti)的(de)位置、方位、狀(zhuang)態等輸出被(bei)控(kong)量(liang)能夠跟隨輸入目標的(de)任意變化的(de)自動(dong)控(kong)制系統(tong)。伺服(fu)(fu)(fu)主要靠脈(mo)沖來(lai)定(ding)位，基本(ben)上可(ke)以這(zhe)樣理解，伺服(fu)(fu)(fu)電(dian)(dian)機(ji)接收到1個(ge)脈(mo)沖，就會旋(xuan)轉1個(ge)脈(mo)沖對應(ying)的(de)角度，從而實現位移，因(yin)為伺服(fu)(fu)(fu)電(dian)(dian)機(ji)本(ben)身具備發出脈(mo)沖的(de)功(gong)能，所以伺服(fu)(fu)(fu)電(dian)(dian)機(ji)每旋(xuan)轉一個(ge)角度，都會發出對應(ying)數量(liang)的(de)脈(mo)沖，這(zhe)樣，和(he)伺服(fu)(fu)(fu)電(dian)(dian)機(ji)接受(shou)的(de)脈(mo)沖形成了呼應(ying)。

無(wu)錫交(jiao)流(liu)伺服電(dian)動機(ji)的(de)工作原理與交(jiao)流(liu)的(de)感應電(dian)動機(ji)相(xiang)同。伺服電(dian)機(ji)在定(ding)子上有兩個相(xiang)空間(jian)位移90°電(dian)角度(du)的(de)勵磁繞(rao)組(zu)Wf和(he)控制繞(rao)組(zu)WcoWf接一恒定(ding)交(jiao)流(liu)電(dian)壓，直流(liu)伺服電(dian)機(ji)報價，利用施加到(dao)Wc上的(de)交(jiao)流(liu)電(dian)壓或相(xiang)位的(de)變化(hua)，達到(dao)控制電(dian)動機(ji)運(yun)行的(de)目的(de)。交(jiao)流(liu)伺服電(dian)動機(ji)具有運(yun)行穩(wen)定(ding)、可(ke)控性(xing)好、響應快速(su)、靈敏度(du)高以及機(ji)械特性(xing)和(he)調節(jie)特性(xing)的(de)非線性(xing)度(du)指標嚴格（要求分別(bie)小(xiao)于10％～15％和(he)小(xiao)于15％～25％）等特點。

交(jiao)(jiao)流(liu)伺(si)(si)(si)(si)服(fu)(fu)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)的(de)定子(zi)結(jie)構與(yu)電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)分相(xiang)單相(xiang)異步(bu)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)基(ji)本相(xiang)似。其定子(zi)配有兩(liang)個(ge)位置相(xiang)差90度的(de)繞組(zu)，直(zhi)流(liu)伺(si)(si)(si)(si)服(fu)(fu)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)詳(xiang)情，一個(ge)是勵磁繞組(zu)Rf，直(zhi)流(liu)伺(si)(si)(si)(si)服(fu)(fu)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)，始終(zhong)接(jie)交(jiao)(jiao)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)Uf；另一個(ge)是與(yu)控制信號電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)Uc連接(jie)的(de)控制繞組(zu)l。所以交(jiao)(jiao)流(liu)伺(si)(si)(si)(si)服(fu)(fu)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)也叫兩(liang)個(ge)伺(si)(si)(si)(si)服(fu)(fu)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)。交(jiao)(jiao)流(liu)伺(si)(si)(si)(si)服(fu)(fu)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)的(de)轉(zhuan)(zhuan)子(zi)通常做(zuo)成鼠籠式(shi)，直(zhi)流(liu)伺(si)(si)(si)(si)服(fu)(fu)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)生產商(shang)，但為了使(shi)伺(si)(si)(si)(si)服(fu)(fu)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)具(ju)有調速范圍寬、線性(xing)機(ji)械(xie)特性(xing)、無“自轉(zhuan)(zhuan)”現象和快(kuai)速響應性(xing)能，與(yu)普通電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)相(xiang)比，它應該具(ju)有轉(zhuan)(zhuan)子(zi)電(dian)(dian)(dian)(dian)(dian)(dian)阻大和轉(zhuan)(zhuan)動慣量小(xiao)兩(liang)個(ge)特點。