关键词: 轴承, 电腐蚀, 寄生电容

Abstract: Bearing electrical corrosion refers to material damage caused by chemical or electrochemical reactions when current passes through the bearing. This phenomenon typically occurs in electrical equipment such as electric motors and generators. When current flows through the bearing, micro-arc discharges may occur inside the bearing, leading to localized overheating and material oxidation. According to the National Energy Administration’ s wind power equipment failure analysis report and data from the equipment management platform, the failure rate of bearing
electrical corrosion in wind power generation units and industrial motors reaches as high as 36. 8 % . The main manifestations include raceway pitting and shaft current erosion,which significantly affect the bearing’ s service life and performance. The paper focuses on the issue of motor bearing electrical corrosion. According to the failure mechanism, based on theoretical and experimental data,the formation of bearing voltage and its influencing factors are studied. The impact of shaft voltage is verified by adjusting internal parasitic capacitance,modifying the equivalent circuit,changing bearing grease,and control strategies. Finally,the experimental analysis results indicate that this study can lay a certain foundation for research on bearing electrical corrosion suppression technology.

Key words: bearing, electric erosion, parasitic capacitance