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电动机三相阻值为零是不是烧了 电阻为零并不代表是电机烧了，而是因为你的万用表的分辨率达不到这个精度，因而测量显示的结果为“零”.如果没有专门的测量电阻的仪表，你是没有办法测出来的.对地测也是一样的，同样没有可比的结果.不用怀疑这个问题，还是检查线路问题吧.
电动机的集电环与电刷的接触面积不得少于百分之几 1、接触电阻变大，励磁电流减小2、使碳刷和滑环过热，严重时会着火3、碳刷和滑环之间打火，造成滑环发生电蚀，磨损增大处理：1、调整碳刷弹簧压力，使碳刷和滑环接触良好2、更换碳刷前，应先打磨碳刷接触面，使碳刷的弧度和滑环弧度一致3、每班用低压气吹扫滑环，防止碳粉堆积4、如滑环磨损严重，应对滑环进行打磨，同时换用软一些的碳刷http：//zhidao.baidu.com/question/113793805.html
