Research On Torque Ripple Suppressed Nine Regions Hysteresis Control On Switched Reluctance Motor

Switched reluctance motor has been applied to all aspects of production and life because of its simple structure,stable and reliable,low cost and good speed regulation.However,the problem of large torque ripple has not been well solved,and inhibiting the torque ripple of SRM has become a research hotspot of this kind of motor in China and abroad.It is of great value and significance for the popularization and application of SRM to analyze the causes of pulsation and seek the suppression methods of pulsation from the motor structure and control strategy.Firstly,this paper analyzes the structure and principle of SRM.According to different accuracy and applicability,three mathematical models of SRM are built,and two SRM ontology simulation modeling methods and three basic control methods are given.Secondly,based on the estimation of the instantaneous torque of SRM and the analysis of the three-level state of the asymmetric drive circuit,the direct instantaneous torque control of the motor is divided into nine regions from the original six regions with the boundary of the obvious change of the inductance of the excitation phase.According to the torque characteristics of each region,different hysteresis control strategies are implemented to reduce the torque ripple during the operation of the motor,especially during the commutation.Simulation results show that this method has good effect on torque ripple suppression during commutation.Then,based on the traditional torque distribution control strategy,fuzzy PID is introduced into the speed outer loop of the control system,and a fuzzy PID control method of switched reluctance motor based on torque distribution function is designed.Simulation results show that the control method has good adaptability to nonlinear systems,and its robustness is also greatly improved.Compared with the traditional fixed parameter PID method,the torque ripple is controlled at a lower level and the dynamic performance is greatly improved.Finally,considering the development cycle,cost performance,scalability and other factors,STM32F103ZET6 master chip is used to build the SRM experimental platform.The motor hardware circuit and development driver are designed to realize the double closed-loop operation of SRM,and the speed,torque and vibration data of the motor are measured.The experimental platform also adds the data interaction function based on One NET Internet of Things to realize the cloud upload and remote query,debugging and manipulation of experimental data.