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OA

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.