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九星绝缘轴承完美解决了电动机轴电流腐蚀的问题

2020-03-27 浏览次数:

某电厂装机两台200MW循环流化床空冷燃煤发电最精确计划机组,每台锅炉配备两台二次风机。该电动机自投运以来频繁发生电动机轴承大,电机运转噪音大等问题,不得已多次更换电动机驱动端和非驱动端轴承,但运行不到3个月就发生重复的故障。最终经分析确认为轴电流导致的轴承损坏,给电动机更换九星电绝缘轴承后,彻底解决了这个问题。

电机轴承损坏现象和原因分析

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一直以来,#1、2锅炉四台二次风机电机轴承频繁出现轴承振动大、温度高的异常现象,运行中测量轴伸端轴承振动X向达13mm/s以上,Y向达9mm/s以上,电机运转中噪音较大,轴承运行也有较大异音。

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电动机轴电流故障的特征

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电动机轴电流的产生

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轴电压形成轴承电流有两种基本途径。一是由于分布电容最精确计划的存在,使电动机定子绕组和轴承形成一个电压回路,进而耦合回路将轴电压传到大地,形成轴电流。二是电机转动时,滚珠和滚道之间不断接触,轴电压超过轴承跑道与滚动体之间的润滑油层穿过电压时,使得轴承内外的滚道发生非正常连接,轴电压就会在轴承上形成很大的放电电流,也就是电火花加工电流,加工电流使得轴承跑道表面出现烧痕。

消除轴电流损坏轴承的措施及实施效果

为了有效消除轴电流损坏轴承的现象。某电厂采取的办法是采用九星电绝缘轴承,切断轴电流的形成回路。为此,某电厂在九星轴承科技有限公司订制了电绝缘轴承,对驱动端的轴承进行更换。

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