Abstract: As the switching speed of power semiconductor devices increases in the inverter driver systems, the common mode voltage with high voltage change rate is generated between the motor winding and the frame, which causes serious electromagnetic interference and bearing electric corrosion problem. The traditional lump parameter models cannot reflect the characteristics of the motor impedance varying with the high frequency. Taking an induction motor with insulated bearings as an example, a high-frequency bearing current model was put forward in this paper. The impedance analyzer was used to test the port impedance with the whole motor and the insulation bearing impedance with the disassembled motor, and the parameters of the high frequency model were extracted according to the port impedance test results. Finally, the accuracy of the model was verified through both frequency and time domain analysis. The frequency characteristics of motor impedances were in good agreement with the measured results. The waveforms of the common mode current and the bearing voltage obtained from the proposed model were close to the measured waveforms.