Abstract
The non-driving end bearing cage of a wind turbine generator experienced a fracture and subsequent failure. In order to understand the reasons behind this failure, various analyses were conducted including examination of the metallographic structure, mechanical properties, fracture surface morphology, bearing vibration, and operating temperature of the cage. Through this analysis, the fracture process of the cage was deduced. The findings indicate that the fracture of the bearing cage was directly caused by the abnormal installation of the spacer. The eccentricity of the axial component resulted in ductile fracture, while the eccentricity of the radial component led to brittle fractures.
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