Research On Torque Ripple Supression And Extended-Smooth Speed Control Of Switched Reluctance Motor

For applications with high reliability and cost requirements,the traditional three-phase permanent magnet motor and induction motor are limited by their own structure,sometimes cannot meet the actual needs.Switched reluctance motor ican be widely used in the above requirements due to low cost,simple and fault-tolerant,such as mine car motor drive system,space start generation power system.Due to its own advantages and market demand,more and more scholars have invested in the research of the ontology structure and control of switched reluctance motors.In this paper,a three-phase 6/4-pole SRM is taken as the research sample,and the control strategy and torque ripple of the switched reluctance motor are deeply studied.Firstly,the paper introduces the principle and the power converter topology of the switched reluctance motor.Based on that,the mathematical model of the ontology is studied.Based on the mathematical characteristics of its flux linkage and inductance,the electromagnetic properties of the Fourier decomposition are analytically modeled.After that,the flux linkage characteristic curve of the required position was measured by two methods of balance torque and rotary chopping.Then a continuous mathematical model of the motor was established.The accuracy of the modeling is proved by comparing the angular position control of the mathematical model with the waveform under the experiment under the same conditions.Secondly,on the basis of accurate mathematical model,the control strategy based on torque distribution function is studied for the problem that the torque ripple of the switched reluctance motor is large.The voltage utilization rate of the traditional torque distribution function is analyzed,and an iterative-based torque distribution function optimization method is proposed.The optimal torque distribution function under each working point is discretely calculated,then the smoothing of the switched reluctance motor is broadened.The range of torque speed has guiding significance for motor design and control.The simulation based on Matlab/Simulink proves the effectiveness of the iterative algorithm.Then,for the problem that the optimal reference current tracking ripple is large,this paper proposes a current prediction control strategy based on incremental inductance,and compensates for the one-shot delay problem in actual digital control.For the problem of predicting the change of resistance parameters in the controller,this paper uses the recursive least squares identification method to converge the inaccurate resistance in one current pulse period,which has both accuracy and rapidity.Then the whole torque inner loop is completed.Based on Matlab/Simulink,the effectiveness of current prediction,parameter identification and torque inner loop control algorithm are proved respectively.Finally,the design scheme of the switched reluctance motor control system based on TMS320F28335 is given,and a hardware platform of the switched reluctance motor drive system is developed.The above control strategy is verified by experiments.The simulation results are consistent,which proves the effectiveness and practicability of the above control strategy.