一是電(dian)(dian)(dian)(dian)源方面的(de)原因：電(dian)(dian)(dian)(dian)壓(ya)偏高或偏低，在特定(ding)負載下，若電(dian)(dian)(dian)(dian)壓(ya)變動(dong)(dong)范圍應在額定(ding)值的(de)+10%到－5%之外會造(zao)成(cheng)電(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)過熱(re)；電(dian)(dian)(dian)(dian)源三(san)相(xiang)(xiang)電(dian)(dian)(dian)(dian)壓(ya)不對稱，電(dian)(dian)(dian)(dian)源三(san)相(xiang)(xiang)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)壓(ya)相(xiang)(xiang)間不平衡度超過5%，會引(yin)繞組(zu)過熱(re)；缺相(xiang)(xiang)運行(xing)，經驗表明農(nong)用電(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)被燒(shao)毀85%以上是由于缺相(xiang)(xiang)運行(xing)造(zao)成(cheng)的(de)，應對電(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)安裝缺相(xiang)(xiang)保(bao)護裝置(zhi)。

二是水泵方面的原因(yin)：選用動力不配套，小馬拉大(da)車，電(dian)動機(ji)長時間過載運行，使電(dian)動機(ji)溫度過高；啟動過于頻繁、定(ding)額為(wei)短時或(huo)斷(duan)續(xu)工作制的電(dian)動機(ji)連續(xu)工作。應限制啟動次(ci)數，正(zheng)確選用熱保(bao)護，按電(dian)動機(ji)上標定(ding)的定(ding)額使用。

三是(shi)電動(dong)機本身(shen)的原因：接(jie)法錯誤，將△形(xing)誤接(jie)成Y形(xing)，使電動(dong)機的溫(wen)(wen)度(du)(du)迅速(su)升高；定子(zi)(zi)繞(rao)組(zu)有相(xiang)間短路、匝間短路或局(ju)部接(jie)地，輕(qing)時電動(dong)機局(ju)部過熱，嚴(yan)(yan)重時絕緣燒(shao)壞；鼠籠(long)轉(zhuan)子(zi)(zi)斷條或存在缺陷(xian)，電動(dong)機運行1到(dao)2小時，鐵芯溫(wen)(wen)度(du)(du)迅速(su)上(shang)升；通風(feng)系統發生故(gu)障，應檢(jian)查風(feng)扇是(shi)否(fou)損壞，旋轉(zhuan)方(fang)向(xiang)是(shi)否(fou)正(zheng)確，通風(feng)孔(kong)道是(shi)否(fou)堵(du)塞；軸承磨損、轉(zhuan)子(zi)(zi)偏心掃膛使定轉(zhuan)子(zi)(zi)鐵心相(xiang)擦發出(chu)金屬撞擊(ji)聲，鐵芯溫(wen)(wen)度(du)(du)迅速(su)上(shang)升，嚴(yan)(yan)重時電動(dong)機冒(mao)煙，甚到(dao)線圈燒(shao)毀。

四是工作(zuo)環(huan)境(jing)方(fang)面的(de)(de)原因(yin)：電(dian)動機繞組受潮或灰塵、油(you)污等(deng)附著在(zai)繞組上，導致(zhi)絕緣降(jiang)低。應測(ce)量電(dian)動機的(de)(de)絕緣電(dian)阻(zu)并進行(xing)清掃、干燥處理；環(huan)境(jing)溫(wen)度(du)過(guo)高(gao)。當環(huan)境(jing)溫(wen)度(du)超過(guo)35℃時，進風(feng)溫(wen)度(du)高(gao)，會使電(dian)動機的(de)(de)溫(wen)度(du)過(guo)高(gao)，應設法豐富其工作(zuo)環(huan)境(jing)。如搭棚遮陽等(deng)。因(yin)電(dian)方(fang)面的(de)(de)原因(yin)發(fa)(fa)生故障，應請獲得專業資格(ge)證書的(de)(de)電(dian)工維修(xiu)，一知半解的(de)(de)人不可盲目維修(xiu)，防止(zhi)人身傷害事故的(de)(de)發(fa)(fa)生。