Aug 24

直流变桨电机常见故障分析与维护内容

风电设备维修中心

   一、直流变桨电机常见故障分析

  1、换向器打火

  在正常情况下,电刷与换向器之间为“滑触”结构,在换相时会产生轻微电火花,不会对设备产生危害。如果换向器表面严重磨损,电刷磨损形成严重积碳,刷握压力异常,电刷位置不在物理中行线上等异常状态时,将引起严重电火花,造成换向器进一步损坏,严重情况下引起换向器绝缘击穿损坏,造成整个电机损坏。

  2、电枢绕组击穿

  电枢绕组、励磁绕发生绕组短路击穿,绕组烧毁故障。通过对电机拆机发现,这种绕组烧毁情况,一般由于电机长期过载高温,引起绕组绝缘层损坏。电机过载原因包括电磁刹车不能正常打开,变桨系统机械卡死等故障。

  3、其他故障

  在变桨系统中报出速度比较、速度超限故障,一般为测速电机或测速编码器损坏,测速电机与测速编码器器都是高精度电子器件,运行中需要注意对harting插头,以及编码器密封圈进行紧固与检查,保证接触可靠。同时要定期更换测速电机碳刷。

  二、直流变桨电机维护内容

  1、将变桨电机外壳与主旋编处做标记线,便于维护完成后安装。对编码器haring头进行紧固。

  2、对变桨电机电枢,励磁绕组进行绝缘测试,保证绝缘大于50MΩ以上,利用直流电阻测试仪测量绕组直流电阻值,并记录。利用万用表测量PT100测温电阻阻值(20℃下阻值为108Ω左右)。测试PTC热敏电阻阻值在180Ω-200Ω之间(不同型号热敏电阻可能略有不同,根据实际阻值记录判断)。

  3、换向器进行清洁维护,维护工具中尽量使用大布、棉签、小刷,在清洁过程中要戴好口罩,防止粉末进入呼吸道,在进行碳粉清理时一定要注意换向器小沟内、轴承内的清理,在清理过程中需要使用无水乙醇辅助。在对碳刷进行维护时需测量碳刷磨损程度,如果出现磨损严重、存在灼痕的需要立即更换。

  4、直流变桨电机维护过程中拍照留存,在内侧合适位置做好标记(例如机位号+桨叶号)在下次维护中做好对比。维护结束后,按照原拆卸步骤倒退安装好电机,并用万用表测量线路与变桨电气原理图纸相符合后,可按上电要求进行上电,再做手动变桨测试,观察变桨方向和速度是否正常。

直流变桨电机常见故障分析与维护内容

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