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Modeling and measurement of capacitive and inductive bearing current in electrical machines

Bearing voltage is the votlage over bearings and end-to-end shaft voltage is the voltage between two ends of the machine shaft. They are all induced by inverter based systems and may cause severe bearing failures and electromagnetic interference (EMI) problems. In this paper a comprehensive high frequency (HF) model of an induction machine for electric vehicles up to 10 Mhz, which simultaneously calculates these two voltages, is established based on physical meaning and eddy-current model. The parasitic capacitances are calculated by 3D Finite Element Method (FEM) while other parameters are derived from impedance curves. The simulation results are close to the measured signals, which validates the model.