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发(fa)布时间:2022-03-14 发(fa)布人(ren):管理员
进口后常常遇到电动(dong)机不能启动(dong),那其原因(yin)有哪些
1, 电(dian)动机(ji)不(bu)转且没有声(sheng)音(yin):
电(dian)源(yuan)或(huo)者绕(rao)组(zu)有(you)两(liang)相或(huo)两(liang)相以(yi)上断(duan)路(lu),首先检查电(dian)源(yuan)是否有(you)电(dian)压(ya)(ya),如果三相电(dian)压(ya)(ya)平衡,那么(me)故障在(zai)电(dian)动机(ji)本身(shen),可(ke)检测电(dian)动机(ji)三相绕(rao)组(zu)的电(dian)阻,寻找出(chu)断(duan)线的绕(rao)组(zu)。
2, 电动机不转但(dan)有嗡(weng)嗡(weng)声:
电(dian)机修理测量电(dian)动机接线(xian)柱,若三(san)相(xiang)电(dian)压(ya)平衡(heng)且为额(e)定电(dian)压(ya)值,可判断(duan)是严重过载,检(jian)查的步骤:先去掉负
载(zai),这时(shi)(shi)电(dian)(dian)(dian)动(dong)(dong)机的转(zhuan)(zhuan)速与声(sheng)音(yin)正常,可(ke)以判(pan)(pan)定过载(zai)或者负载(zai)机械部(bu)分(fen)有故障(zhang),若任然不(bu)转(zhuan)(zhuan)动(dong)(dong),可(ke)用手转(zhuan)(zhuan)动(dong)(dong)一(yi)(yi)下电(dian)(dian)(dian)动(dong)(dong)机轴(zhou),如果很紧或转(zhuan)(zhuan)不(bu)动(dong)(dong),再测三相电(dian)(dian)(dian)流(liu),若三相电(dian)(dian)(dian)流(liu)平(ping)衡,但比额定值大,说明电(dian)(dian)(dian)动(dong)(dong)机的机械部(bu)分(fen)被卡住,可(ke)能(neng)是电(dian)(dian)(dian)动(dong)(dong)机缺油,轴(zhou)承锈死,或损(sun)坏(huai)严重,端盖(gai)或者油盖(gai)装(zhuang)的太斜,转(zhuan)(zhuan)子和(he)内膛(tang)相碰(peng)(扫(sao)膛(tang))当用手转(zhuan)(zhuan)动(dong)(dong)电(dian)(dian)(dian)动(dong)(dong)机轴(zhou)到某一(yi)(yi)角度时(shi)(shi)感到比较吃力或听到周期性的擦(ca)擦(ca)声(sheng),可(ke)判(pan)(pan)断为扫(sao)膛(tang)。
3, 电动机(ji)转速(su)慢且有(you)嗡嗡声(sheng):
这种故障表现为(wei)轴振东,若(ruo)测(ce)得一(yi)相(xiang)(xiang)电(dian)流为(wei)零,而另两相(xiang)(xiang)电(dian)流大(da)大(da)超过额定电(dian)流,说明(ming)是两相(xiang)(xiang)运转,其原因是:电(dian)路(lu)或者电(dian)源一(yi)相(xiang)(xiang)断(duan)(duan)路(lu),或电(dian)动(dong)(dong)机(ji)绕(rao)组一(yi)相(xiang)(xiang)断(duan)(duan)路(lu)。小容(rong)量(liang)(liang)(liang)的(de)(de)电(dian)动(dong)(dong)机(ji)可以用万(wan)用表直接测(ce)量(liang)(liang)(liang)是否通(tong)断(duan)(duan)。中等容(rong)量(liang)(liang)(liang)的(de)(de)电(dian)动(dong)(dong)机(ji)由于绕(rao)组多(duo)采用多(duo)根导线并(bing)绕(rao)多(duo)支(zhi)路(lu)并(bing)联(lian),其中若(ruo)断(duan)(duan)掉(diao)若(ruo)干根或断(duan)(duan)开(kai)一(yi)条并(bing)联(lian)支(zhi)路(lu)时检查(cha)起(qi)来就比较麻(ma)烦(fan),这样的(de)(de)情况通(tong)常采用相(xiang)(xiang)电(dian)流平衡法或者电(dian)阻(zu)(zu)法。电(dian)阻(zu)(zu)法用电(dian)桥测(ce)量(liang)(liang)(liang)三相(xiang)(xiang)绕(rao)组的(de)(de)电(dian)阻(zu)(zu),如三相(xiang)(xiang)电(dian)阻(zu)(zu)相(xiang)(xiang)差(cha)百分五以上,电(dian)阻(zu)(zu)较大(da)的(de)(de)一(yi)相(xiang)(xiang)为(wei)断(duan)(duan)路(lu)相(xiang)(xiang)。