Noise and Vibration Performance of Permanent Magnet Synchronous Motor for Pure Electric Vehicle Integrated Drive System

Abstract:

Based on the dynamic finite element model of electric powertrain, modal analysis was implemented with and without a reducer. After analyzing the mechanism of vibration and noise of the powertrain, dynamic responses of the reducer was calculated by numerical simulation method, which takes the internal dynamic excitation of gears and electromagnetic excitation into consideration. The effects of integrated structure on motor dynamic characteristics were obtained by using frequency domain analysis upon the motor vibration and noise. Finally, an experimental bench was used to test the vibration acceleration and radiation noise of the powertrain in semi anechoic room, verifying conclusions reached by theoretical analysis. The results show that the modes and the performance of noise, vibration and harshness(NVH) have changed after integrating with the reducer.

Key words:electric powertrain; permanent magnet synchronous motor; gear excitation; electromagnetic excitation; vibration and noise