Design And Simulation Of Exterior Rotor Switched Reluctance In-wheel Motor For Electric Vehicle

Electric vehicle,which is driven by the in-wheel motor,is regarded as the important develop direction of auto industry.In-wheel motor integrated motor,brake equipment,decelerator and wheel hub,which is one of the key technologies of pure electric vehicle.Switched reluctance motor is the research hotspots of in-wheel motor,duing to hanving big starting torque,meeting starting and stopping frequently,having high efficiency,owning wide speed range and power feedback.In this paper,the exterior rotor switched reluctance motor is taken as the drive device,and the design and simulation of in-wheel motor is studied.Fristly,the basic structure and electromagnetic parameters of the exterior rotor switched reluctance motor are determined.The characteristics and drive form of the in-wheel motor is analyzed.The exterior rotor switched reluctance motor is selected as the drive motor for its bigger drive torque,more compact structure.In this paper,planetary decelerating mechanism is selected to be the decelerating and increasing torque unit,owing to the limited space in the wheel.A new in-wheel motor structure is proposed according to the requirements of the electric vehicle design.The analysis process and computing process is provided.Secondly,the force and vibration model of the in-wheel motor under different road conditions are studied.The liner model,quasi-linear model,non-linear model of the in-wheel motor are analyzed by analyse the working principle and basic structure of the exterior rotor switched reluctance motor.The in-wheel motor is designed using the integrated design,which increases the unsprung mass,the torque ripple,the vibration noise and so on.The defect of the in-wheel motor can be solved in two ways,one is through structure design,and the other one is electromagnetic optimization.The in-wheel active vibration system and the Finite Element Analysis of in-wheel motor shaft are studied to solving those problems from structure design of in-wheel motor.Then,the Electromagnetic Finite Element Analysis of in-wheel motor is studied based on Ansoft Maxwell 2D.The simulation model of the in-wheel motor is built by Maxwell 2D.The model,material,boundary,excitation source,core loss parameters,simulation parameters and motion part of in-wheel motor are set.According to the simulation result,flux linkage-angle-electric current and torque-angle-electric current curves are obtained.The post-processing researches of Finite Element Analysis result are carried out.Finally,the electromagnetic parameters simulation platform of the in-wheel motor is established by Matlab/Simulink.According to the simulation data of in-wheel motor on steady-state magnetic fieldand using the two-dimensional look-up table module,the flux linkage and torque curves are obtained by three order spline interpolation.Based on the analysis of simulation results,the electromagnetic parameters variation of in-wheel motor is obtained in different position and electric current.The design about feasibility and effectiveness of exterior rotor SRM in-wheel motor is verified,through theoretical analysis,calculation and simulation experiment,which forms firm foundation both of theory and practice for subsequent research.