Analysis of Bearing Electro-erosion under Different Speeds

Due to the discharge phenomenon occurring during the operation of variable-frequency motor drives, bearings are susceptible to electric corrosion, ultimately leading to bearing damage. This paper, based on the discharge principles of bearing electro-erosion, introduces for the first time a multi-physics coupling simulation approach involving electrical-thermal-corrosion effects. Firstly, the mechanism of bearing electro-erosion is analyzed. Secondly, the oil film thickness generated by bearings at speeds ranging from 3000rpm to 7000rpm is calculated using the minimum oil film formula. Subsequently, an electrical-thermal-corrosion simulation model is established to perform multi-physics coupling simulations, assessing the impact of different speeds on bearing electro-erosion. This research holds significant importance for enhancing bearing performance design and maintenance strategies.