Abstract
The bearing capacitance and bearing voltage are the main causes of the failure of the driving motor bearing in the electric vehicle powered by the PWM inverter. It has an important influence on the driving safety of the electric vehicle, and is very important to calculate the bearing voltage and bearing current accurately. Taking 6006 ball bearings in 25KW permanent magnet motor as an example, this paper analyzes the load of each rolling element under the action of gravity, unilateral magnetic pull and centrifugal force. Then this paper discusses the effect of load distribution and speed on the contact area and oil film thickness between each rolling element and the raceway. And the estimation results of bearing capacitance at different speeds are given out. It could provide a reference basis for the life calculation and reliability analysis of the motor bearing in electric vehicle.
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