1 實例分析

一(yi)臺型號(hao)為(wei)(wei)(wei)JR115—8額定功率為(wei)(wei)(wei)60 kW的三(san)相(xiang)異(yi)(yi)步(bu)(bu)電(dian)(dian)動機(ji)(ji)(ji)， 空載試(shi)驗電(dian)(dian)壓(ya)(ya)剛升到以(yi)幾十伏時三(san)相(xiang)電(dian)(dian)流(liu)即不(bu)平(ping)(ping)衡(heng)(heng)．其中有(you)(you)一(yi)相(xiang)電(dian)(dian)流(liu)小一(yi)半(ban)左(zuo)右(you)，東(dong)(dong)元高(gao)(gao)壓(ya)(ya)電(dian)(dian)機(ji)(ji)(ji)配件(jian)， 同時電(dian)(dian)機(ji)(ji)(ji)發(fa)出嗡嗡聲。此電(dian)(dian)機(ji)(ji)(ji)為(wei)(wei)(wei)Y接．從理論分析(xi)， 三(san)相(xiang)所(suo)加電(dian)(dian)壓(ya)(ya)相(xiang)同，如(ru)果電(dian)(dian)流(liu)小一(yi)半(ban)左(zuo)右(you)．那(nei)么(me)阻抗大(da)一(yi)倍左(zuo)右(you)，由此分析(xi)，此臺電(dian)(dian)機(ji)(ji)(ji)有(you)(you)可能是支路斷線(xian)(xian)。為(wei)(wei)(wei)進一(yi)一(yi)步(bu)(bu)確定故(gu)障原因(yin)(yin)(yin)，將電(dian)(dian)機(ji)(ji)(ji)定轉子(zi)分離， 分別測(ce)試(shi)。定子(zi)電(dian)(dian)壓(ya)(ya)給到70 V時，觀察定子(zi)三(san)相(xiang)電(dian)(dian)流(liu)不(bu)平(ping)(ping)衡(heng)(heng)，東(dong)(dong)元高(gao)(gao)壓(ya)(ya)電(dian)(dian)機(ji)(ji)(ji)價格，用手(shou)觸(chu)摸繞組端部，發(fa)現有(you)(you)繞組異(yi)(yi)常涼，后經檢(jian)(jian)查證(zheng)實(shi)確有(you)(you)支路斷線(xian)(xian)。為(wei)(wei)(wei)了通過現象(xiang)，迅速(su)判斷故(gu)障原因(yin)(yin)(yin)，決定對(dui)造(zao)成(cheng)三(san)相(xiang)異(yi)(yi)步(bu)(bu)電(dian)(dian)動機(ji)(ji)(ji)三(san)相(xiang)電(dian)(dian)流(liu)不(bu)平(ping)(ping)衡(heng)(heng)的各種(zhong)原因(yin)(yin)(yin)進行總結分析(xi)。如(ru)何利用現有(you)(you)設(she)備盡快查出故(gu)障原因(yin)(yin)(yin)，提高(gao)(gao)檢(jian)(jian)修速(su)度并保證(zheng)檢(jian)(jian)修質量(liang)成(cheng)了亟待解決的問題。2 造(zao)成(cheng)故(gu)障的原因(yin)(yin)(yin)造(zao)成(cheng)三(san)相(xiang)異(yi)(yi)步(bu)(bu)電(dian)(dian)動機(ji)(ji)(ji)三(san)相(xiang)電(dian)(dian)流(liu)不(bu)平(ping)(ping)衡(heng)(heng)原因(yin)(yin)(yin)有(you)(you)以(yi)下兩方面。

電動機維修工(gong)藝要點簡介

電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)在運(yun)(yun)行中，東元高壓(ya)電(dian)(dian)機(ji)(ji)(ji)配件銷售中心，可(ke)能(neng)發生(sheng)這樣或(huo)那樣的故障，造成電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)失(shi)常，甚至燒毀電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)。引起電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)運(yun)(yun)行失(shi)常或(huo)燒毀的原因(yin)很多，例(li)如：啟動(dong)(dong)及(ji)制動(dong)(dong)時的高損耗(hao)；連續運(yun)(yun)行時過載；反復(fu)短(duan)時工作(zuo)的操作(zuo)次數過多；轉(zhuan)子堵轉(zhuan)；三相(xiang)電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)斷相(xiang)運(yun)(yun)轉(zhuan)；低(di)電(dian)(dian)壓(ya)運(yun)(yun)行；周圍環境溫度(du)過高、濕度(du)過大及(ji)粉塵、酸(suan)性(xing)氣體(ti)腐蝕等。電(dian)(dian)動(dong)(dong)機(ji)(ji)(ji)常見的修理工作(zuo)是電(dian)(dian)機(ji)(ji)(ji)繞組(zu)更換修理、鐵芯損壞修理和轉(zhuan)子故障處理等。

1 電機(ji)定(ding)子繞組(zu)的(de)修理(li)

、幾種(zhong)缺(que)相保護電路(lu)的工作原理(li)

三(san)相(xiang)異步電(dian)動(dong)(dong)機缺相(xiang)運行(xing)一般(ban)有以下幾種情況：繞(rao)組(zu)(zu)星形接(jie)(jie)法(fa)(fa)斷(duan)一相(xiang)電(dian)源、三(san)角形接(jie)(jie)法(fa)(fa)斷(duan)一相(xiang)電(dian)源、三(san)角形接(jie)(jie)法(fa)(fa)的繞(rao)組(zu)(zu)內(nei)部(bu)一相(xiang)斷(duan)路、多臺三(san)角形接(jie)(jie)法(fa)(fa)的電(dian)動(dong)(dong)機并聯運行(xing)斷(duan)一相(xiang)電(dian)源等。無(wu)論是星形接(jie)(jie)法(fa)(fa)還是三(san)角形接(jie)(jie)法(fa)(fa)，電(dian)動(dong)(dong)機缺相(xiang)運行(xing)，其(qi)定子(zi)繞(rao)組(zu)(zu)都將因電(dian)流增(zeng)大而過熱燒毀。

目前(qian)大部分電動機(ji)(ji)的缺相保(bao)(bao)護(hu)(hu)都(dou)是采用(yong)微(wei)機(ji)(ji)保(bao)(bao)護(hu)(hu)裝(zhuang)置(zhi)、電子(zi)式(shi)保(bao)(bao)護(hu)(hu)裝(zhuang)置(zhi)或(huo)(huo)其他保(bao)(bao)護(hu)(hu)裝(zhuang)置(zhi)，元(yuan)(yuan)件較多，漳州東元(yuan)(yuan)高壓(ya)電機(ji)(ji)，線路復雜。出現問題(ti)時，有時可能會(hui)失去保(bao)(bao)護(hu)(hu)作(zuo)(zuo)用(yong)或(huo)(huo)工作(zuo)(zuo)失常，對生(sheng)產造成不利(li)影響。為了避免(mian)這種(zhong)現象，本文介紹幾種(zhong)簡便易行的缺相保(bao)(bao)護(hu)(hu)電路。