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　它采用(yong)隔爆外殼把可(ke)能(neng)(neng)產生火(huo)花、電(dian)弧和危險溫度(du)的(de)電(dian)氣部(bu)分與周圍的(de)爆炸(zha)性(xing)氣體(ti)(ti)混(hun)合(he)物隔 開。但是(shi),這種外殼并(bing)非是(shi)密封的(de),周圍的(de)爆炸(zha)性(xing)氣體(ti)(ti)混(hun)合(he)物可(ke)以通過(guo)外殼的(de)各部(bu)分接合(he)面間隙進入電(dian)機內部(bu)。當與外殼內的(de)火(huo)花、電(dian)弧、危險高溫等(deng)引燃源接觸時(shi)就可(ke)能(neng)(neng)發生爆炸(zha),這時(shi)電(dian)機的(de)隔爆外殼不僅不會損(sun)壞或變(bian)形,而且爆炸(zha)火(huo)焰或熾熱氣體(ti)(ti)通過(guo)接合(he)面間隙傳出時(shi),也不能(neng)(neng)引燃周圍的(de)爆炸(zha)性(xing)氣體(ti)(ti)混(hun)合(he)物。

      當一(yi)臺三相異(yi)步(bu)防爆電(dian)(dian)(dian)(dian)機通(tong)(tong)入(ru)三相交流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)時，它要(yao)同時完(wan)成(cheng)上述兩(liang)個(ge)過程。通(tong)(tong)入(ru)三相交流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)的(de)繞組要(yao)產生旋(xuan)轉(zhuan)(zhuan)磁(ci)(ci)場(chang)，以4極(ji)為例，4極(ji)繞組要(yao)產生4個(ge)閉合(he)磁(ci)(ci)回(hui)路(lu)。這(zhe)一(yi)閉合(he)回(hui)路(lu)要(yao)穿(chuan)過氣隙(xi)，經由轉(zhuan)(zhuan)子(zi)缺芯，再回(hui)到定子(zi)鐵(tie)芯閉合(he)。旋(xuan)轉(zhuan)(zhuan)磁(ci)(ci)場(chang)的(de)轉(zhuan)(zhuan)速(su)為n1=60f/p（r/min），也撐防爆電(dian)(dian)(dian)(dian)機的(de)同步(bu)轉(zhuan)(zhuan)速(su)，式中f：電(dian)(dian)(dian)(dian)源(yuan)頻率，Hz；p：極(ji)對數。在(zai)旋(xuan)轉(zhuan)(zhuan)磁(ci)(ci)場(chang)作(zuo)用下，轉(zhuan)(zhuan)子(zi)導條因切(qie)割(ge)磁(ci)(ci)力(li)線(xian)，產生了感應電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，完(wan)成(cheng)率第(di)一(yi)個(ge)過程；而(er)栽流(liu)(liu)(liu)的(de)轉(zhuan)(zhuan)子(zi)導條在(zai)磁(ci)(ci)場(chang)中要(yao)收到磁(ci)(ci)場(chang)的(de)拉(la)力(li)，完(wan)成(cheng)了第(di)二(er)個(ge)過程，防爆電(dian)(dian)(dian)(dian)機轉(zhuan)(zhuan)子(zi)因導條受(shou)到拉(la)力(li)而(er)旋(xuan)轉(zhuan)(zhuan)，轉(zhuan)(zhuan)速(su)為n。若(ruo)n=n1，導條與旋(xuan)轉(zhuan)(zhuan)磁(ci)(ci)場(chang)間就(jiu)因相對靜止(zhi)而(er)沒有切(qie)割(ge)磁(ci)(ci)力(li)線(xian)，也就(jiu)不(bu)會產生感應電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，導條就(jiu)得不(bu)到磁(ci)(ci)場(chang)的(de)拉(la)力(li)，轉(zhuan)(zhuan)子(zi)就(jiu)不(bu)能旋(xuan)轉(zhuan)(zhuan)。就(jiu)是說(shuo)，切(qie)割(ge)磁(ci)(ci)力(li)線(xian)，產生感應電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，受(shou)到旋(xuan)轉(zhuan)(zhuan)磁(ci)(ci)場(chang)的(de)拉(la)動而(er)旋(xuan)轉(zhuan)(zhuan)。沒有這(zhe)個(ge)“異(yi)”就(jiu)不(bu)能工作(zuo)，故稱異(yi)步(bu)電(dian)(dian)(dian)(dian)動機。

增安(an)型電機工作(zuo)原理：
　　它(ta)是在(zai)正常運行條件下不會(hui)產生電(dian)弧、火花或危險高(gao)溫的(de)電(dian)機(ji)結構上,再采取(qu)一些機(ji)械(xie)、電(dian)氣(qi)和熱(re)的(de)保(bao)護措施,使之進(jin)一步(bu)避(bi)免(mian)在(zai)正常或認可的(de)過載條件下出現電(dian)弧、火花或高(gao)溫的(de)危險,從而確保(bao)其防爆安全性。

無火花型電機工(gong)作原(yuan)理：

　　此電(dian)(dian)(dian)(dian)(dian)機(ji)是指在(zai)正常運(yun)行條件下,不(bu)會點燃周圍爆炸性混合(he)物,且一(yi)般又不(bu)會發生點燃故障的(de)電(dian)(dian)(dian)(dian)(dian)機(ji)。與增安型(xing)電(dian)(dian)(dian)(dian)(dian)機(ji)相(xiang)比,除對(dui)絕(jue)緣介電(dian)(dian)(dian)(dian)(dian)強度試驗電(dian)(dian)(dian)(dian)(dian)壓、繞(rao)組(zu)(zu)溫升、tE(在(zai)最(zui)高環境(jing)溫度下達到額(e)定(ding)運(yun)行最(zui)終溫度后(hou)的(de)交流繞(rao)組(zu)(zu),從(cong)開始(shi)通過起動電(dian)(dian)(dian)(dian)(dian)流時計起至上(shang)升到極(ji)限溫度的(de)時間)以及起動電(dian)(dian)(dian)(dian)(dian)流比不(bu)象增安型(xing)那樣(yang)有特(te)殊規定(ding)外,其他(ta)方面與增安型(xing)電(dian)(dian)(dian)(dian)(dian)機(ji)的(de)設計要求一(yi)樣(yang)。