Research on Vibration Control Method of Electric Vehicle Electric Drive System under Steady Operating Conditions

High-performance electric drive systems represent a critical enabler for electric vehicle advancement, confronting significant challenges from multi-source nonlinear vibrations. Among these, high-frequency electromagnetic vibrations in traction motors under steady-state operation emerge as a particularly salient issue. This study establishes a mathematical model for electric vehicle drive systems based on magnetic field energy conservation in air-gap domains and Newton-Euler formulations. Furthermore, through investigating the electromechanical coupling vibration characteristics, precise a real-time parametric mapping mechanism is constructed between electromagnetic torque fluctuations and harmonic current parameters (amplitude, frequency, and phase). Integrating Proportional-Integral-Resonant (PI-R) controllers with online lookup tables for harmonic current compensation, an optimal harmonic current injection method is proposed for active torque fluctuation suppression. Simulation results demonstrate that compared with mainstream current harmonic optimization approaches, the proposed harmonic injection method effectively reduces electromagnetic torque fluctuations. Under rated operating conditions, the maximum amplitude of electromagnetic torque fluctuations decreases by 53.03%, with significant reductions in 24th and 48th rotational frequency harmonics. This research provides theoretical references for active electromagnetic vibration control methodologies in electric drive systems.