Rosemount罗斯蒙特3051DG2A62A1AB4HR5
三相异步电动机绕组接错造成不完整的旋转磁场,致使启动困难、三相电流不平衡、噪声大等症状,严重时若不及时处理会烧坏绕组。主要有下列几种情况:某极相中一只或几只线圈嵌反或头尾接错；极(相)组接反；某相绕组接反；多路并联绕组支路接错；“△”、“Y”接法错误。
1、故障现象
电动机不能启动、空载电流过大或不平衡过大,温升太快或有剧烈振动并有很大的噪声、烧断保险丝等现象。
2、产生原因
误将“△”型接成“Y”型；维修保养时三相绕组有一相首尾接反；减压启动是抽头位置选择不合适或内部接线错误；新电机在下线时,绕组连接错误；旧电机出头判断不对。
3.检修方法
(1)滚珠法。如滚珠沿定子内圆周表面旋转滚动,说明正确,否则绕组有接错现象。
(2)指南针法。如果绕组没有接错,则在一相绕组中,指南针经过相邻的极(相)组时,所指的极性应相反,在三相绕组中相邻的不同相的极(相)组也相反；如极性方向不变时,说明有一极(相)组反接；若指向不定,则相组内有反接的线圈。
(3)万用表电压法。按接线图,如果两次测量电压表均无指示,或一次有读数、一次没有读数,说明绕组有接反处。
(4)常见的还有干电池法、毫安表剩磁法、电动机转向法等。
4.处理方法
(1)一个线圈或线圈组接反,则空载电流有较大的不平衡,应进厂返修。
(2)引出线错误的应正确判断首尾后重新连接。
(3)减压启动接错的应对照接线图或原理图,认真校对重新接线。
(4)新电机下线或重接新绕组后接线错误的,应送厂返修。
(5)定子绕组一相接反时,接反的一相电流特别大,可根据这个特点查找故障并进行维修。
(6)把“Y”型接成“△”型或匝数不够,则空载电流大,应及时更正。
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