关键词: 电动汽车, 转矩脉动, 传动系统, 扭转振动

Abstract: The low-frequency torque ripple of vehicular machines can easily trigger torsional vibration in the electric drive transmission system, thus compromising the driving experience of electric vehicles. The establishes a dynamic model of a typical electric drive transmission system using lumped parameter method to obtain the frequency distribution law of torsional vibration under torque pulsation. finite element simulation was employed to obtain numerical solutions of torque
ripple considering factors such as slot effects, core saturation, and non-sinusoidal magnetic fields, and an accurate analytical model of torque ripple concerning stator current was established. A reference current harmonic design and current harmonic closed-loop control method were proposed to weaken the low-frequency torque ripple and actively suppress torsional vibration in the electric drive transmission system. A joint simulation of the torque ripple model and transmission system dynamic model was conducted in MATLAB / Simulink, and the effectiveness of the torsional vibration characteristics analysis and active suppression of the transmission system is validated.

Key words: electric vehicles, torque ripple, transmission system, torsional vibration