角磨机正常情况下都是有火花的。只要是电动工具，刚开机那一会儿都是有火花的。看功率的大小。小功率的火花就小，大功率的火花就大一点。这个都是正常现象。
如何判断转子烧了呢？第一看机子的火花。如果电机有问题的话，火花会一直很大，而且不会停的。火花会比正常情况下大很多。第2个看转速。转子有问题的话，转速会变慢。第3个听声音。转子有问题的话声音会比较想，有时会断断续续的。正常的情况下，电机是清脆的声音。转子有问题的话，杂音比较大。第4个是烧烫刷，转子如果有问题的话，一副烫刷用不了多久就要换了，可能用10分钟或者是一个小时。一般从前面1.2.4点就能判断转子有问题了。
推荐大家一款工业级的角磨机
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