Research of the motor-reducer integrated system NVH under multi-source excitation

QU Feng1, LIU Dong-liang1,2, LI A-qiang1, YANG Xiang-pan1
(1.School of Automation, Hangzhou Dianzi University, Hangzhou 310018, China;
2.Wolong Electric Group Co.,Ltd., Shangyu 312300, China)

Abstract: Aiming at the problems of noise, vibrationand harshness in electric vehicles, the vibration and noise of the powertrain system composed of electric motor-reducer were studied. Firstly, a modeling method considering the motor-reducer assembly system was proposed, and the modal analysis was carried out for the system. According to the actual needs, the basic parameters of the motorreducer were designed, and the main excitation source of vibration and noise of the motor and reducer was analyzed. Then the vibration and noise analysis was carried out for the influence of electromagnetic excitation and mechanical excitation on the motor-reducer system. Finally, the simulation and experimental verification of the vibration and noise characteristics of the powertrain under multi-source excitation were carried out. The results show that the simulation results of the motor-reducer powertrain system under multi-source excitation are in agreement with the experimental results, and the correctness of the proposed permanent magnet synchronous motor and reducer powertrain modeling is verified. It explains that this model can be used for the optimization design of actual engineering.
Key words: electric vehicle; powertrain; electric magnetization; mechanical incentive; noise,vibrationand harshness(NVH)