Control Strategy Of Minimizing Torque Ripples Of The Switched Reluctance Motor By Injecting Piecewise Harmonic Currents

As we all know,with the development of social modernization,the traditional natural resources that are widely used are becoming more and more scarce,and the natural environment is also becoming more and more serious.The electric vehicle driven by clean energy has the advantages of no consumption of fossil fuels,strong regeneration and braking ability of motor,and less local emissions.It has been recognized as an ideal green vehicle and has broad application prospects.Switched Reluctance Motor(SRM)is a simple and strong motor with no rare-earth characteristics,super high speed operation and no pollution operation.However,SR motor has many disadvantages such as large torque ripple,strong noise and so on,making it directly applied to higher requirements.With the growing maturity of power electronics technology and computer control technology,the switched reluctance motor speed control system based on it has been developing rapidly,and has attracted more and more attention in the field of electric vehicle driving.Therefore,the optimization of torque ripple of switched reluctance motor is one of the most popular research ’fields.This paper proposes a new control strategy for the suppression of torque ripple in the traditional current chopping control,directly to the reference current into a series of rectangular harmonic currents,additional torque to generate the corresponding,to supplement or eliminate the torque ripple current generated by the original reference.In order to improve the harmonic current injection of SR motor torque ripple reduction more flexible and effective,n injection of sinusoidal harmonic current component divided into n segments,the harmonic component adjustment coefficient of the corresponding section,independent control of each segmented interval reference current waveform,and then control the output torque of the motor.The new control strategy can achieve the goal of reducing the torque ripple under the current chopper control.Finally,the effectiveness and practicability of the proposed method are verified by simulation and experiment.