Research On Torque Ripple Suppression Technology Of Switched Reluctance Motor Based On Offline TSF

With the improvement of driving technology and development of energy-saving,the switched reluctance motor(SRM)is widely employed in aerospace,automotive drive and industrial control fields due to its simple structure,high starting torque,high toleration.However,owing to inherent dual salient pole structure and magnetic circuit nonlinearity,it is difficult to avoid serious noise and vibration during operation.Therefore,how to reduce the torque ripple become a research hotspot in the industry for scholars to further apply the SRM.A offline method about depressing torque ripple is researched in this paper to run in wide speed range.Firstly,five control strategies to depress torque ripple of SRM are compared and analyzed after introducing control methods of SRM.Considering the operating principle and the equivalent circuit equation,the current chopper control,voltage chopper control and angle position control are analyzed emphatically.Secondly,a new offline torque sharing function(TSF)method has proposed in this paper after the cause of torque ripple is analyzed based on TSF.The inductance-torque characteristics of SRM is obtained by finite element(FE)simulation software,the reversible torque equation is built by two rotor position functions,and the reference current is obtained to achieve good current tracking characteristics.The square of current(copper loss)are combined with Tikhonov factor to construct an objective optimization function.The appropriate value of Tikhonov factor is selected through the balance between efficiency and torque speed to reduce the rate of current change.By adjusting the Tikhonov factor,the reference current curve during commutation is changed in order to improve the current tracking ability at high speed.Thirdly,Maxwell/Simplorer simulation platform on coupling field and circuit is built.The control strategies of cubic,offline TSF and improved offline TSF are compared and simulated at the three different speeds with 12/8 pole three-phase SRM as the controlled object.The simulation results show that the proposed control strategy has a significant suppression effect on torque ripple,and that it can adapt to speed changes and reduce the peak value of the phase current after commutation,which verifies the feasibility of the method.Finally,the STM32F103ZET6 produced by ST Microelectronics was selected as the main control chip.The main circuit and driving circuit are designed according to the actual operating parameters,and the hardware platform of the control system is built.The control strategy is implemented on the integrated development environment of Keil 5 based on C language programming.The output characteristics of SRM is analyzed through experimental results,and the rationality of the method proposed in this subject is verified.