Research On Torque Ripple And Vibration Suppression Of Switched Reluctance Motor

Electrification and intelligence are the development trends of the automotive industry in the future.Switched reluctance motor(SRM)is regarded as a new motor with great competitiveness because of its advantages such as low cost,simple structure,high reliability and strong fault tolerance.However,the torque ripple and vibration noise problems of SRM always restrict its further development and application.In this paper,a series of theoretical and experimental studies have been carried out to suppress the torque ripple and vibration noise of SRM.The torque ripple of SRM is caused by the discontinuous output of tangential electromagnetic force,and the main cause of vibration and noise is the sudden change of the radial electromagnetic force on the stator.Therefore,the analysis of electromagnetic force is an important part to study and solve these two problems.Based on the principle of multi-physics coupling,this paper uses the finite element analysis method to study the electromagnetic characteristics,electromagnetic force characteristics,vibration characteristics and other physical aspects of the motor in turn,and establishes the vibration analysis model of SRM.Aiming at the torque ripple and vibration noise of SRM,based on the simulation data,a torque and radial force control strategy is proposed.During the commutation period,the current output share of each phase is adjusted to reduce the torque ripple and the radial force ripple at the same time,so as to achieve the purpose of smoothing the torque and reducing vibration noise.The simulation model of the control system is built by Simulink.By comparing with the traditional control strategy,the torque and radial force control is verified to be effective in restraining torque ripple and vibration noise,and the expected suppression effect is achieved.Aiming at the problem of tail-current caused by torque and radial force control,an adaptive turn-off strategy considering commutation overlap angle is proposed.According to the theoretical derivation,the turn-off angle of the motor is modified adaptively.The simulation results show that this method can reduce the RMS value of three-phase current and improve the operation efficiency of the motor while ensuring the original control effect.By comparing different parameter tuning strategies,it is found that the dynamic performance of the system is related to the selection of parameter tuning strategies.Therefore,an adaptive parameter tuning strategy for torque and radial force adjustment coefficients is proposed to optimize the overall dynamic performance of the control system.According to the torque and radial force control strategy and its improvement scheme proposed in this paper,the related hardware and software design work is carried out,and a12/8 pole SRM with rated power of 4k W and rated speed of 2200r/min is tested on the SRM experimental platform.Taking the traditional double closed-loop control strategy as reference,the torque ripple and vibration noise of the motor are tested respectively.After processing and analyzing the experimental results,it is proved that the proposed torque and radial force control strategy can effectively suppress the torque ripple and vibration noise.