Torque ripple suppression strategy of asynchronous motor for electric vehicle based on random pulse position space vector pulse width modulation with uniform probability density

Abstract

A random modulation strategy is proposed to suppress the torque ripple of asynchronous motor for electric vehicle in this article. First, the models of harmonic torque and torque ripple are established. The reason of harmonic generation and its effect on torque are analysed. Second, the random position pulse width modulation (PWM) strategy with different random quantities is introduced. The problem of the increasing harmonic content near the integer multiple of the switching frequency in the modulation process is solved. Subsequently, the influences of different random quantity distributions and random number ranges on harmonic suppression are studied. The different structures of random pulse position space vector PWM strategy based on uniform probability density are designed. The specific harmonic content is dispersed and the torque ripple is suppressed. Finally, the precise test platform based on cSPACE is established. The influence of different random PWMs on motor at various speeds is compared. Experimental results verify the validity of the proposed approach.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Research on a brushless DC motor control method based on double chopping width modulation

“…However, due to the failure of the current to undergo sudden changes during commutation, corresponding torque pulsations may occur during the actual demand process, which may cause interference to the entire central control area [1][2][3] . References [4] and [5] analyzed the influence of different PWM modes on the electromagnetic torque of brushless DC motors when they are in an electric state. However, during actual operation, the motor may operate in generator mode due to interference from different external influencing factors.…”