防(fang)爆交(jiao)流伺服電(dian)(dian)(dian)機(ji)(ji)(ji)通(tong)(tong)(tong)常(chang)都是單相(xiang)異步電(dian)(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)，有(you)鼠籠(long)形(xing)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)子(zi)(zi)(zi)(zi)(zi)和(he)杯(bei)形(xing)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)子(zi)(zi)(zi)(zi)(zi)兩(liang)種結構形(xing)式。與普通(tong)(tong)(tong)電(dian)(dian)(dian)機(ji)(ji)(ji)一樣(yang)，交(jiao)流伺服電(dian)(dian)(dian)機(ji)(ji)(ji)也由定(ding)(ding)(ding)子(zi)(zi)(zi)(zi)(zi)和(he)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)子(zi)(zi)(zi)(zi)(zi)構成。定(ding)(ding)(ding)子(zi)(zi)(zi)(zi)(zi)上(shang)(shang)有(you)兩(liang)個(ge)繞(rao)組(zu)(zu)，即勵磁繞(rao)組(zu)(zu)和(he)控制(zhi)繞(rao)組(zu)(zu)，兩(liang)個(ge)繞(rao)組(zu)(zu)在(zai)空(kong)間相(xiang)差90°電(dian)(dian)(dian)角度。固(gu)定(ding)(ding)(ding)和(he)保護(hu)定(ding)(ding)(ding)子(zi)(zi)(zi)(zi)(zi)的(de)機(ji)(ji)(ji)座一般用(yong)(yong)硬(ying)鋁或不(bu)銹(xiu)鋼制(zhi)成。籠(long)型轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)子(zi)(zi)(zi)(zi)(zi)交(jiao)流伺服電(dian)(dian)(dian)機(ji)(ji)(ji)的(de)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)子(zi)(zi)(zi)(zi)(zi)和(he)普通(tong)(tong)(tong)三相(xiang)籠(long)式電(dian)(dian)(dian)機(ji)(ji)(ji)相(xiang)同。杯(bei)形(xing)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)子(zi)(zi)(zi)(zi)(zi)交(jiao)流伺服電(dian)(dian)(dian)機(ji)(ji)(ji)的(de)結構由外(wai)(wai)定(ding)(ding)(ding)子(zi)(zi)(zi)(zi)(zi)，杯(bei)形(xing)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)子(zi)(zi)(zi)(zi)(zi)和(he)內(nei)(nei)(nei)定(ding)(ding)(ding)子(zi)(zi)(zi)(zi)(zi)三部(bu)(bu)分組(zu)(zu)成。它的(de)外(wai)(wai)定(ding)(ding)(ding)子(zi)(zi)(zi)(zi)(zi)和(he)籠(long)型轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)子(zi)(zi)(zi)(zi)(zi)交(jiao)流伺服電(dian)(dian)(dian)機(ji)(ji)(ji)相(xiang)同，轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)子(zi)(zi)(zi)(zi)(zi)則由非磁性(xing)導電(dian)(dian)(dian)材料（如銅或鋁）制(zhi)成空(kong)心杯(bei)形(xing)狀(zhuang)，杯(bei)子(zi)(zi)(zi)(zi)(zi)底部(bu)(bu)固(gu)定(ding)(ding)(ding)在(zai)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)軸7上(shang)(shang)。空(kong)心杯(bei)的(de)壁很薄（小(xiao)于0.5mm），因此(ci)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)動(dong)(dong)慣量很小(xiao)。內(nei)(nei)(nei)定(ding)(ding)(ding)子(zi)(zi)(zi)(zi)(zi)由硅(gui)鋼片疊壓(ya)而成，固(gu)定(ding)(ding)(ding)在(zai)一個(ge)端蓋上(shang)(shang)，內(nei)(nei)(nei)定(ding)(ding)(ding)子(zi)(zi)(zi)(zi)(zi)上(shang)(shang)沒有(you)繞(rao)組(zu)(zu)，僅(jin)作磁路用(yong)(yong)。電(dian)(dian)(dian)機(ji)(ji)(ji)工作時，內(nei)(nei)(nei)﹑外(wai)(wai)定(ding)(ding)(ding)子(zi)(zi)(zi)(zi)(zi)都不(bu)動(dong)(dong)，只有(you)杯(bei)形(xing)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)子(zi)(zi)(zi)(zi)(zi)在(zai)內(nei)(nei)(nei)、外(wai)(wai)定(ding)(ding)(ding)子(zi)(zi)(zi)(zi)(zi)之間的(de)氣隙中轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)動(dong)(dong)。對于輸出功率較小(xiao)的(de)交(jiao)流伺服電(dian)(dian)(dian)機(ji)(ji)(ji)，常(chang)將勵磁繞(rao)組(zu)(zu)和(he)控制(zhi)繞(rao)組(zu)(zu)分別(bie)安放在(zai)內(nei)(nei)(nei)、外(wai)(wai)定(ding)(ding)(ding)子(zi)(zi)(zi)(zi)(zi)鐵心的(de)槽(cao)內(nei)(nei)(nei)。
電(dian)機(ji)主要部件包括：1、機(ji)座(zuo)；2、鐵心；3、繞組；4、端蓋(gai)；5、軸承；6、離心開關或起動繼電(dian)器和PTC起動器；7、銘牌。
1機座
機(ji)座(zuo)(zuo)結(jie)構(gou)(gou)隨電(dian)動(dong)機(ji)冷卻方式(shi)、防護型式(shi)、安(an)裝方式(shi)和用(yong)途而異。按(an)其材料分類(lei)，有(you)鑄(zhu)(zhu)(zhu)鐵、鑄(zhu)(zhu)(zhu)鋁(lv)和鋼板(ban)(ban)結(jie)構(gou)(gou)等幾種。鑄(zhu)(zhu)(zhu)鐵機(ji)座(zuo)(zuo)，帶有(you)散(san)熱筋。機(ji)座(zuo)(zuo)與(yu)端蓋(gai)聯(lian)接，用(yong)螺栓緊固。鑄(zhu)(zhu)(zhu)鋁(lv)機(ji)座(zuo)(zuo)一般不帶有(you)散(san)熱筋。鋼板(ban)(ban)結(jie)構(gou)(gou)機(ji)座(zuo)(zuo)，是由厚為1.5-2.5毫米(mi)的(de)(de)(de)薄鋼板(ban)(ban)卷制、焊接而成，再焊上鋼板(ban)(ban)沖壓件(jian)的(de)(de)(de)底(di)腳。有(you)的(de)(de)(de)專(zhuan)用(yong)電(dian)動(dong)機(ji)的(de)(de)(de)機(ji)座(zuo)(zuo)相(xiang)當(dang)特殊(shu)，如電(dian)冰箱的(de)(de)(de)電(dian)動(dong)機(ji)，它通常與(yu)壓縮機(ji)一起裝在一個密封的(de)(de)(de)罐(guan)子里(li)。而洗(xi)衣機(ji)的(de)(de)(de)電(dian)動(dong)機(ji)，包括甩(shuai)干機(ji)的(de)(de)(de)電(dian)動(dong)機(ji)，均無機(ji)座(zuo)(zuo)，端蓋(gai)直接固定在定子鐵心上。
2鐵心
鐵(tie)心包(bao)括(kuo)定子(zi)鐵(tie)心和轉子(zi)鐵(tie)心，作用(yong)與三相異步(bu)電動機一(yi)樣，是(shi)用(yong)來構(gou)成電動機的磁路。
3繞組
單相(xiang)異(yi)步電(dian)動機(ji)定(ding)子繞(rao)(rao)組(zu)常做成兩(liang)相(xiang)：主繞(rao)(rao)組(zu)（工作繞(rao)(rao)組(zu)）和(he)副(fu)繞(rao)(rao)組(zu)（啟動繞(rao)(rao)組(zu)）。兩(liang)種繞(rao)(rao)組(zu)的(de)中軸線錯(cuo)開(kai)一定(ding)的(de)電(dian)角(jiao)度(du)。目的(de)是為了改善(shan)啟動性(xing)能和(he)運行性(xing)能。定(ding)子繞(rao)(rao)組(zu)多(duo)采用(yong)高強(qiang)度(du)聚脂漆包線繞(rao)(rao)制。
轉子(zi)繞組一般采用(yong)籠型繞組。常用(yong)鋁壓鑄而成。
4端蓋
相應于不同(tong)的機座材料、端蓋(gai)也(ye)有鑄(zhu)鐵件(jian)、鑄(zhu)鋁件(jian)和鋼板(ban)沖壓件(jian)。
5軸承
軸承(cheng)有(you)滾珠(zhu)軸承(cheng)和含油軸承(cheng)。
6離(li)心開(kai)關或起動(dong)繼電器和PTC起動(dong)器
（1）離心開關
在(zai)單(dan)相異步(bu)電(dian)動(dong)(dong)(dong)(dong)機(ji)中，除(chu)了(le)電(dian)容運(yun)轉(zhuan)電(dian)動(dong)(dong)(dong)(dong)機(ji)外，在(zai)起動(dong)(dong)(dong)(dong)過程中，當轉(zhuan)子轉(zhuan)速(su)達到同步(bu)轉(zhuan)速(su)的70%左右時，常借(jie)助于離心(xin)開關(guan)，切除(chu)單(dan)相電(dian)阻起動(dong)(dong)(dong)(dong)異步(bu)電(dian)動(dong)(dong)(dong)(dong)機(ji)和電(dian)容起動(dong)(dong)(dong)(dong)異步(bu)電(dian)動(dong)(dong)(dong)(dong)機(ji)的起動(dong)(dong)(dong)(dong)繞組，或切除(chu)電(dian)容起動(dong)(dong)(dong)(dong)及運(yun)轉(zhuan)異步(bu)電(dian)動(dong)(dong)(dong)(dong)機(ji)的起動(dong)(dong)(dong)(dong)電(dian)容器。離心(xin)開關(guan)一般安裝在(zai)軸伸(shen)端(duan)蓋的內側(ce)。
（2）起動繼電器
有些電(dian)動(dong)機(ji)，如電(dian)冰箱電(dian)動(dong)機(ji)，由于它與壓縮機(ji)組(zu)(zu)裝(zhuang)在(zai)一起(qi)，并放在(zai)密(mi)封的(de)罐子(zi)里(li)，不便(bian)于安裝(zhuang)離(li)心開關，就用起(qi)動(dong)繼電(dian)器代替。繼電(dian)器的(de)吸(xi)鐵(tie)線圈串聯在(zai)主(zhu)繞(rao)(rao)(rao)組(zu)(zu)回路(lu)中(zhong)，起(qi)動(dong)時，主(zhu)繞(rao)(rao)(rao)組(zu)(zu)電(dian)流(liu)很(hen)大，銜鐵(tie)動(dong)作(zuo)，使串聯在(zai)副(fu)繞(rao)(rao)(rao)組(zu)(zu)回路(lu)中(zhong)的(de)動(dong)合(he)(he)觸點(dian)閉(bi)合(he)(he)。于是副(fu)繞(rao)(rao)(rao)組(zu)(zu)接(jie)通，電(dian)動(dong)機(ji)處于兩相繞(rao)(rao)(rao)組(zu)(zu)運行(xing)狀態(tai)。隨著轉(zhuan)子(zi)轉(zhuan)速上升(sheng)，主(zhu)繞(rao)(rao)(rao)組(zu)(zu)電(dian)流(liu)不斷下(xia)降，吸(xi)引(yin)線圈的(de)吸(xi)力(li)(li)(li)下(xia)降。當到達一定的(de)轉(zhuan)速，電(dian)磁鐵(tie)的(de)吸(xi)力(li)(li)(li)小于觸點(dian)的(de)反作(zuo)用彈簧(huang)的(de)拉(la)力(li)(li)(li)，觸點(dian)被打(da)開，副(fu)繞(rao)(rao)(rao)組(zu)(zu)就脫(tuo)離(li)電(dian)源(yuan)。
（3）PTC起動器
最新式(shi)的(de)(de)啟(qi)(qi)動(dong)(dong)元(yuan)件(jian)(jian)是(shi)“PTC”，它是(shi)一種能(neng)“通”或“斷”的(de)(de)熱(re)敏(min)電(dian)(dian)(dian)(dian)阻(zu)(zu)。PTC熱(re)敏(min)電(dian)(dian)(dian)(dian)阻(zu)(zu)是(shi)一種新型的(de)(de)半(ban)導體(ti)元(yuan)件(jian)(jian)，可用作延時(shi)型起(qi)動(dong)(dong)開關。使(shi)用時(shi)，將PTC元(yuan)件(jian)(jian)與電(dian)(dian)(dian)(dian)容起(qi)動(dong)(dong)或電(dian)(dian)(dian)(dian)阻(zu)(zu)起(qi)動(dong)(dong)電(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)的(de)(de)副(fu)繞(rao)組串聯。在起(qi)動(dong)(dong)初期，因(yin)(yin)PTC熱(re)敏(min)電(dian)(dian)(dian)(dian)阻(zu)(zu)尚未(wei)發熱(re)，阻(zu)(zu)值(zhi)(zhi)很低(di)，副(fu)繞(rao)組處于通路狀態，電(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)開始起(qi)動(dong)(dong)。隨著時(shi)間(jian)的(de)(de)推移，電(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)的(de)(de)轉速不斷增加(jia)，PTC元(yuan)件(jian)(jian)的(de)(de)溫(wen)度(du)(du)(du)因(yin)(yin)本身的(de)(de)焦(jiao)耳(er)熱(re)而上升，當(dang)(dang)超(chao)過居里點(dian)(dian)Tc（即電(dian)(dian)(dian)(dian)阻(zu)(zu)急劇增加(jia)的(de)(de)溫(wen)度(du)(du)(du)點(dian)(dian)），電(dian)(dian)(dian)(dian)阻(zu)(zu)劇增，副(fu)繞(rao)組電(dian)(dian)(dian)(dian)路相(xiang)當(dang)(dang)于斷開，但還有一個很小(xiao)的(de)(de)維持電(dian)(dian)(dian)(dian)流，并有2-3瓦(wa)的(de)(de)損(sun)耗，使(shi)PTC元(yuan)件(jian)(jian)的(de)(de)溫(wen)度(du)(du)(du)維持在居里點(dian)(dian)Tc值(zhi)(zhi)以(yi)上。當(dang)(dang)電(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)停止運行(xing)后，PTC元(yuan)件(jian)(jian)溫(wen)度(du)(du)(du)不斷下降，約(yue)2-3分鐘其電(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)降到(dao)Tc點(dian)(dian)以(yi)下，這時(shi)有可以(yi)重(zhong)新啟(qi)(qi)動(dong)(dong)，這一時(shi)間(jian)正好是(shi)電(dian)(dian)(dian)(dian)冰箱和空調機(ji)(ji)(ji)(ji)所(suo)規定(ding)的(de)(de)兩次開機(ji)(ji)(ji)(ji)間(jian)的(de)(de)停機(ji)(ji)(ji)(ji)時(shi)間(jian)。
PTC起動器(qi)的優(you)點(dian)：無(wu)觸(chu)點(dian)、運行(xing)可(ke)靠、無(wu)噪(zao)無(wu)電火(huo)花(hua)，防火(huo)、防爆性(xing)能好。且耐(nai)振動、耐(nai)沖(chong)擊、體積(ji)小、重量輕、價格低。
7銘牌
包括：電機名稱、型號、標準編號、制造廠名、出廠編號、額定(ding)電壓、額定(ding)功率(lv)、額定(ding)電流、額定(ding)轉速(su)、繞組(zu)接法、絕(jue)緣等級等。