半直驱中速永磁同步发电机轴承发生微电流腐蚀的故障诊断分析  

DIAGNOSIS AND ANALYSIS OF MICRO CURRENT CORROSION FAULTS IN BEARINGS OF SEMI DIRECT DRIVE MEDIUM SPEED PERMANENT MAGNET SYNCHRONOUS GENERATORS

作　　者：王子顺 Wang Zishun(Mingyang Smart Energy Group Co.,Ltd.,Zhongshan 528400,China)

机构地区：[1]明阳智慧能源集团股份公司,中山528400

出　　处：《太阳能》2024年第5期101-108,共8页Solar Energy

摘　　要：轴承滚道形貌出现“搓衣板”纹路的故障模式是风电机组常见的主要故障之一。针对半直驱中速永磁同步发电机轴承发生微电流腐蚀故障,首先通过在线监测系统采集发电机轴承运行时的振动信号,然后对振动信号故障特征进行提取与诊断分析,研究和复现轴承滚道微电流腐蚀的失效模式和故障发展历程,最后同步验证抑制轴电流的措施的有效性,以此保障风电机组健康可靠地运行。分析表明:该故障风电机组的发电机轴承滚道出现的“搓衣板”纹路并非轴承的主要失效模式,而是轴承滚道发生二次损伤的表现。随着时间推移,轴承滚道出现的损伤(浅坑)纹路逐渐重复叠加并变得更加清晰,说明该发电机的主要失效模式为轴承微电流腐蚀。The failure mode of bearing raceway with a"washboard"pattern is one of the common faults in wind turbines.This paper focuses on the micro current corrosion fault of bearings in semi direct drive medium speed permanent magnet synchronous generators.Firstly,the vibration signals of generator bearings during operation are collected through an online monitoring system.Then through the extraction and diagnostic analysis of vibration signal fault characteristics,the failure mode and fault development process of micro current corrosion in bearing raceways are studied and reproduced.Finally,the effectiveness of measures to suppress shaft current is synchronously verified to ensure the healthy and reliable operation of wind turbines.Analysis shows that the"washboard"pattern on the bearing raceway of generator in faulty wind turbine is not the main failure mode of the bearing,but a manifestation of secondary damage to the bearing raceway.Over time,the damage(shallow pits)pattern on the bearing raceway gradually overlap and becomes clearer,indicating that the main failure mode of the generator is bearing micro current corrosion.

关 键 词：微电流腐蚀 半直驱中速永磁同步发电机 风电机组 轴承 振动信号 故障诊断 在线监测 

分 类 号：TM315[电气工程—电机] TH17[机械工程—机械制造及自动化]