伺(si)服電(dian)機與步進(jin)(jin)電(dian)機的(de)區別：運行性(xing)能不同：步進(jin)(jin)電(dian)機的(de)控(kong)制(zhi)為(wei)開環(huan)控(kong)制(zhi)，啟動頻率過(guo)高(gao)或負載過(guo)大易(yi)出(chu)(chu)(chu)現(xian)丟步或堵轉(zhuan)的(de)現(xian)象，停止時轉(zhuan)速過(guo)高(gao)易(yi)出(chu)(chu)(chu)現(xian)過(guo)沖的(de)現(xian)象，交(jiao)流(liu)伺(si)服電(dian)機價(jia)格，所以(yi)為(wei)保證其控(kong)制(zhi)精度，應處理(li)好(hao)升(sheng)、降速問題。交(jiao)流(liu)伺(si)服驅動系統為(wei)閉環(huan)控(kong)制(zhi)，驅動器可直接(jie)對(dui)電(dian)機編碼器反(fan)饋信號進(jin)(jin)行采樣，內部構成位置環(huan)和速度環(huan)，一般不會出(chu)(chu)(chu)現(xian)步進(jin)(jin)電(dian)機的(de)丟步或過(guo)沖的(de)現(xian)象，控(kong)制(zhi)性(xing)能更為(wei)可靠(kao)。

交(jiao)(jiao)流(liu)(liu)伺服(fu)電(dian)(dian)機(ji)(ji)(ji)(ji)的優良性能：1、 控(kong)制精(jing)度高(gao)。步(bu)進(jin)(jin)電(dian)(dian)機(ji)(ji)(ji)(ji)的步(bu)距角一般為(wei)1．8。(兩(liang)相)或(huo)0．72。(五相)，而(er)交(jiao)(jiao)流(liu)(liu)伺服(fu)電(dian)(dian)機(ji)(ji)(ji)(ji)的精(jing)度取決于電(dian)(dian)機(ji)(ji)(ji)(ji)編(bian)碼器(qi)(qi)的精(jing)度。以(yi)伺服(fu)電(dian)(dian)機(ji)(ji)(ji)(ji)為(wei)例，其編(bian)碼器(qi)(qi)為(wei)l6位，驅(qu)動器(qi)(qi)每(mei)接收2 =65 536個脈沖，電(dian)(dian)機(ji)(ji)(ji)(ji)轉(zhuan)(zhuan)一圈，其脈沖當量(liang)為(wei)360‘／65 536=0，交(jiao)(jiao)流(liu)(liu)伺服(fu)電(dian)(dian)機(ji)(ji)(ji)(ji)咨詢，0055 ；并實現了位置的閉環控(kong)制．從根本上克服(fu)了步(bu)進(jin)(jin)電(dian)(dian)機(ji)(ji)(ji)(ji)的失步(bu)問題。2、 矩頻特性好。步(bu)進(jin)(jin)電(dian)(dian)機(ji)(ji)(ji)(ji)的輸出力矩隨轉(zhuan)(zhuan)速的升高(gao)而(er)下降，且在較高(gao)轉(zhuan)(zhuan)速時會急劇下降，交(jiao)(jiao)流(liu)(liu)伺服(fu)電(dian)(dian)機(ji)(ji)(ji)(ji)報價，其工(gong)作轉(zhuan)(zhuan)速一般在每(mei)分鐘幾十轉(zhuan)(zhuan)到幾百轉(zhuan)(zhuan)。而(er)交(jiao)(jiao)流(liu)(liu)伺服(fu)電(dian)(dian)機(ji)(ji)(ji)(ji)在其額(e)定轉(zhuan)(zhuan)速(一般為(wei)2000r／min或(huo)3000r／rain)以(yi)內為(wei)恒轉(zhuan)(zhuan)矩輸出，在額(e)定轉(zhuan)(zhuan)速以(yi)E為(wei)恒功率輸出。

交(jiao)流(liu)(liu)伺(si)服(fu)電(dian)(dian)(dian)(dian)動機(ji)的(de)(de)結構主(zhu)要(yao)可分(fen)為兩(liang)部分(fen)，交(jiao)流(liu)(liu)伺(si)服(fu)電(dian)(dian)(dian)(dian)機(ji)，即定(ding)(ding)(ding)子(zi)(zi)部分(fen)和轉子(zi)(zi)部分(fen)。其(qi)中定(ding)(ding)(ding)子(zi)(zi)的(de)(de)結構與(yu)旋(xuan)轉變壓器(qi)的(de)(de)定(ding)(ding)(ding)子(zi)(zi)基本(ben)相(xiang)同(tong)，在(zai)定(ding)(ding)(ding)子(zi)(zi)鐵心中也(ye)安放著(zhu)空間互(hu)成90度(du)電(dian)(dian)(dian)(dian)角度(du)的(de)(de)兩(liang)相(xiang)繞組(zu)(zu)(zu)(zu)。其(qi)中一(yi)組(zu)(zu)(zu)(zu)為激(ji)磁繞組(zu)(zu)(zu)(zu)，另一(yi)組(zu)(zu)(zu)(zu)為控(kong)(kong)制繞組(zu)(zu)(zu)(zu)，交(jiao)流(liu)(liu)伺(si)服(fu)電(dian)(dian)(dian)(dian)動機(ji)是一(yi)種兩(liang)相(xiang)的(de)(de)交(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)動機(ji)。 交(jiao)流(liu)(liu)伺(si)服(fu)電(dian)(dian)(dian)(dian)動機(ji)使(shi)用(yong)時，激(ji)磁繞組(zu)(zu)(zu)(zu)兩(liang)端施(shi)加(jia)恒定(ding)(ding)(ding)的(de)(de)激(ji)磁電(dian)(dian)(dian)(dian)壓Uf，控(kong)(kong)制繞組(zu)(zu)(zu)(zu)兩(liang)端施(shi)加(jia)控(kong)(kong)制電(dian)(dian)(dian)(dian)壓Uk。當定(ding)(ding)(ding)子(zi)(zi)繞組(zu)(zu)(zu)(zu)加(jia)上電(dian)(dian)(dian)(dian)壓后，伺(si)服(fu)電(dian)(dian)(dian)(dian)動機(ji)很快就會(hui)轉動起來。