The analysis and simulation of motor´s torque ripple in electric vehicle

Electric vehicle has speed vibration problem in Low-speed condition; one of the reasons is that the vehicle power-train resonates with motor´s torque ripple in low motor speed. This paper analyzes the reason of motor´s torque ripple in low speed; and proposes a method to reduced torque ripple in particular speed that vehicle power-train´s natural frequency corresponding to; and builds motor model and motor controlling model in equivalent circuit software; and summarizes of the method to reduce the motor´s torque ripple and vehicle´s speed vibration preliminarily.