Research On Position Control System Of Switched Reluctance Machine Based On The Dynamic Equation

Switched reluctance machine(SRM)has the advantages of simple and sturdy structure,high efficiency,high reliability,flexible control,wide speed range,and low cost.This article focuses on the problems of high nonlinearity and large step angle in the SRM body,and studies the position control system with SRM as the core,and conducts simulation and experimental research.Firstly,this article analyzes the characteristics of the SRM nonlinear model,and combines the method of special position magnetic flux measurement to establish a binary magnetic flux analytical formula for a 12/8 structure SRM.The SRM nonlinear model is built on the Matlab/Simulink platform,and based on this,the SRM simulation model is built and current chopping simulation is carried out.The established model is verified,laying the foundation for subsequent simulation research.Then,in response to the problems that need to be overcome in the SRM position control method,this article designs an SRM position control strategy based on the dynamic equation,which divides the motion process of the SRM into two stages for control: stage one is the acceleration and constant speed stages of the SRM,and fuzzy PI control is used;The second stage is the braking stage of the SRM,which constrains the speed waveform through speed hysteresis control,making the movement distance of the SRM from start to stop equal to the preset target,in order to achieve position control.A corresponding simulation model was built in Matlab/Simulink and verified through simulation: the traditional PI and fuzzy PI control strategies were compared through simulation,verifying the superiority of the fuzzy PI control method;Simulation of position control under multiple working conditions was conducted and error analysis was conducted.The analysis results showed that the position control strategy has high accuracy and feasibility.Subsequently,in response to the requirements of the SRM position control system,the overall hardware system framework was designed,and each hardware module was designed and built separately.Based on the circuit structure of the current and voltage detection modules,the proportion coefficients between input and output variables were calculated,and various components were selected.The main parameters of the core components were listed;A software system was designed for the position control strategy proposed in this article,a program flowchart was designed and explained,and various subprograms were written.Finally,experimental verification was conducted on the simulation,comparing the traditional PI and fuzzy PI control strategies to verify the superiority of fuzzy control;Experimental verification and analysis were conducted on the simulation results of position control under a set of operating conditions.The analysis results showed that the position control strategy proposed in this paper is feasible to a certain extent,and the reasons for the larger simulation errors compared to the experimental results were analyzed.