Research On Torque Ripple Suppression Control Strategy And Controller Design Of Switched Reluctance Motors

With the shortage of energy resources and the deterioration of the environment,China has placed greater emphasis on the strategic position of the new energy industry and has vigorously promoted the development of electric vehicles.The motor as the power component of the electric vehicle is the core factor that determines the performance index of the electric vehicle.As the study found,the switched reluctance motor has a very large potential advantage in this regard.The motor not only has the advantages of simple structure,wide speed range,flexible control,and the ability to operate under harsh conditions of high temperature rise,but also can achieve fast startup and frequent forward and reverse rotations at very low currents while ensuring high precision and high output performance indicators.The switched reluctance motor should be widely promoted,but due to its inherent double salient pole structure,it will produce large torque ripple and noise during operation,which greatly reduces the stability of the motor operation.Too large torque ripple restricts the popularization of the switched reluctance motor,which makes how to suppress the torque ripple of the switched reluctance motor has become a research hotspot.This paper first introduces the structure of the switched reluctance motor and analyzes its operating principle.Secondly,Ansoft software is used to analyze the switched reluctance motor to obtain its operating data.Then the data parameters are imported into the MATLAB software,and a switched reluctance motor simulation model is established using a two-dimensional table look-up method.Subsequently,the principle of direct instantaneous torque control method was analyzed and discussed.Then the simulation model was built according to the principle and compared with the traditional current chopper control method.It was found that the direct instantaneous torque control method had far more effective suppression of torque ripple through the simulation results,Better than current chopping control method.Direct instantaneous torque control can largely suppress the generation of torque ripple,but this method also has limitations.Simulations at high speeds show that the torque in the commutation interval will generate large torque ripples.Through the analysis of the waveform,it was found that the peak current of the subsequent phase winding was too large and could not be reduced in time,resulting in large torque ripple at the next moment.According to the analysis results,This paper improved the direct instantaneous torque system.A partial voltage resistor is added to limit the peak current during Two-phase overlapping area.Through the simulation,it is found that the improved direct instantaneous torque control method has further optimized the torque ripple suppression effect.Finally,the STM32F103 chip is used to design the switch reluctance motor speed controller,which mainly includes the hardware and software design of the power conversion module,the drive module,the detection module and the protection module,and the corresponding waveforms are measured through experiments.