Abstract
Electromagnetic excitation and mechanical excitation are the primary causes of vibration in electric drive system (EDS) assemblies. This study investigates the dynamic characteristics of plastic gear transmission components within an electric drive assembly under electromagnetic-mechanical excitation coupling, using a specific automotive electric drive system as the research subject. A rigid-flex coupling dynamic model of the electric drive system was established using Ansys Motion, enabling comprehensive analysis of the motor, plastic gears, drive system housing, and bearings. Building upon this, a finite element model of the permanent magnet synchronous motor (PMSM) was developed to analyze electromagnetic excitation effects. Ultimately, the vibration response characteristics of the plastic gears, bearings, and various housing sections under combined electromagnetic-mechanical excitation were examined in both the time domain and frequency domain. Research indicates that integrating PEEK gears into transmission systems alters the dynamic characteristics of electric drive systems. In the frequency domain, the excitation components within the system become more complex, increasing the risk of resonance and altering the primary excitation components. In the time domain, the inclusion of PEEK gears significantly impacts transmission errors at each stage and housing response, with bearings near the PEEK gears being most affected. In terms of noise, the housing noise level is significantly reduced by approximately 11% compared to metal gear drives.This study provides an in-depth analysis of plastic gear transmission characteristics, offering guidance for noise, vibration, and harshness (NVH) performance analysis and structural optimization in electric drive systems (EDS) utilizing plastic gear drives.
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