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<p>The integration of motor and gearbox has become an advanced technology in the powertrain design for new energy commercial vehicles. However, the integrated design introduces complex vibration and noise issues such as knocking and whistling caused by the motor and gearbox excitation coupling. This study presents an electromechanical coupling dynamic model for the motor-gear system by considering multi-source excitation. This study elucidates the effects of multi-source excitation frequencies on both motor parameters and the dynamic characteristics of the mechanical system. The electromechanically coupled vibrational characteristics of the multi-gear electric drive assembly are described by the variation amplitude of multi-source excitation, such as gear mesh misalignment (GMM), time-varying mesh stiffness, transmission error (TE), gear backlash, and motor speed and torque. The validity of the proposed GMM model and the electromechanical coupled dynamic model is confirmed through the comparisons of simulation with the SIMPACK software platform and experimental tests, with relative errors maintained within 9% and 17%, respectively. Notably, variations in gear TEs significantly influence the electromechanical coupling, while changes in motor speed markedly affect the distribution of the system's resonant frequencies. The findings of this research provide valuable guidance for the vibration and noise reduction technology of electric drive assembly.</p>

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Electromechanical Coupled Vibration Analysis of Integrated Motor-Gearbox System: Affect by Multi-excitation Source

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Yonggang Liu,
  • Dingchang He,
  • Pengchuan Wang,
  • Zhiyuan Peng,
  • Shuan Yao,
  • Jing Wei,
  • Yi Zhang

摘要

The integration of motor and gearbox has become an advanced technology in the powertrain design for new energy commercial vehicles. However, the integrated design introduces complex vibration and noise issues such as knocking and whistling caused by the motor and gearbox excitation coupling. This study presents an electromechanical coupling dynamic model for the motor-gear system by considering multi-source excitation. This study elucidates the effects of multi-source excitation frequencies on both motor parameters and the dynamic characteristics of the mechanical system. The electromechanically coupled vibrational characteristics of the multi-gear electric drive assembly are described by the variation amplitude of multi-source excitation, such as gear mesh misalignment (GMM), time-varying mesh stiffness, transmission error (TE), gear backlash, and motor speed and torque. The validity of the proposed GMM model and the electromechanical coupled dynamic model is confirmed through the comparisons of simulation with the SIMPACK software platform and experimental tests, with relative errors maintained within 9% and 17%, respectively. Notably, variations in gear TEs significantly influence the electromechanical coupling, while changes in motor speed markedly affect the distribution of the system's resonant frequencies. The findings of this research provide valuable guidance for the vibration and noise reduction technology of electric drive assembly.