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电机轴承漏电的原因以及预防措施

2024-07-03

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电机轴承漏电可能由多种因素引起,根据搜集到的信息,以下是一些可能导致电机轴承漏电的常见原因:

1. 潮气或水分侵入:如果电机内部受到潮气或水分的侵入,可能会降低电机内部的绝缘性能,导致电流在轴承处发生泄漏。

2. 绕组上的油污或污垢:电机绕组上积聚的油污或污垢可能会降低绕组与轴承之间的绝缘性能,使得电流在不应该流通的地方流通,产生漏电。

3. 绝缘性能降低或破损:电机的进出线或接线盒接头如果绝缘性能不佳或破损,电流可能会从接头处泄漏出来,导致漏电。

4. 电机过热或绝缘老化:长时间运行或恶劣工作环境可能导致电机内部温度过高,使得绝缘材料老化、开裂,进而引发漏电。

5. 轴电压:电机在运行过程中可能会产生轴电压,这通常是由于电机磁路不平衡产生的。轴电压虽然很低,但可以在电动机转轴、机座以及壳体之间形成电压通路,产生轴电流,导致轴承损坏。

6. PWM逆变器驱动:使用以绝缘栅双极晶体管(IGBT)为功率器件的脉宽调制(PWM)逆变器作为感应电机的驱动电源时,轴电流问题可能变得严重,增加了轴承损坏的风险。

7. 安装和维护不当:安装不当或维护不足也可能导致轴承漏电,如安装时轴承表面受损,或轴承润滑不良等。

为了预防和解决电机轴承漏电问题,可以采取以下措施:

- 加强电机的防水防潮措施,确保电机内部不受外部潮气和雨水的侵入。

- 定期清理电机绕组上的油污和污垢,保持其清洁干燥。

- 定期检查进出线或接线盒接头的绝缘性能,及时发现并处理绝缘降低或破损的问题。

- 对于已经发生绝缘老化的电机,应及时进行维护和更换,以防止漏电事故的发生。

在处理电机轴承漏电问题时,建议寻求专业人员的帮助和指导,以确保操作的安全和有效性。

(来源:石化设备检维修专委会)

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