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A Method to Determine the Critical Current Value of the Bearing Electrical Corrosion

The bearing discharge is an extremely complex problem, which is the key in the study of the relationship between the high frequency bearing current and the bearing electrical corrosion. The multi-physics finite element calculation is adopted to analyze the bearing breakdown process. Firstly, a three-dimensional model of the bearing was built and the static structural simulation of the model was performed to obtain the minimum thickness of the bearing oil film. Then the model of bearing breakdown is established. The electric-thermal coupling simulation of the bearing breakdown is carried out and the temperature rise of bearing model under a certain current excitation is acquired. Finally, based on the melt temperature of the bearing steel, a method for determining the critical current of the bearing electrical corrosion is proposed.