Unequal Width Of Single Side Flat Tooth Based On Stratified Multi-Objective Optimization Design Of Permanent Magnet Linear Synchronous Motor

With the increasing demand for precision machining technology in industrial manufacturing,permanent magnet linear synchronous motor(PMLSM)is widely used in the servo field represented by numerical control machine tools because of its superior performance of high thrust,high precision and high efficiency.For single side short primary flat plate PMLSM,this paper focuses on structural design and thrust optimization.he specific work is as follows:Basic design of single side short primary flat PMLSM.This paper introduces the operation principle of the motor,carries out a detailed mathematical analysis of the detent force,defines the decisive influence of the mover length on the end force,and expounds the fundamental reason why the double-layer structure of the winding has higher cogging force than the singlelayer structure.On this basis,the initial structure model of the motor is established and the specific size parameters are designed.Optimal design of single side short primary flat plate PMLSM.With the help of finite element analysis,the performance indexes of the initial structure of the motor are calculated,and the relationship between thrust performance and core length,yoke thickness,slot width,permanent magnet width and permanent magnet thickness is analyzed parametrically.In order to solve the problem of excessive thrust fluctuation in the initial model,three structures are used to optimize the initial structure,including side auxiliary teeth,semi-open slot and four corner arc permanent magnet.A new structure of PMLSM is proposed.The full factor simulation results of the small teeth at the middle and end of the semi-open slot show that better thrust performance can be obtained when the width of the small teeth is different.If the decline of the average thrust is not considered,it can be reduced by 75.87% compared with the initial model.On this basis,combined with the effectiveness of three structural optimization in reducing the thrust wave,a new PMLSM with unequal tooth width is proposed.A new structure of PMLSM is proposed.On the basis of structural optimization,taking the thrust characteristics as the test index,the width,height and position of the auxiliary tooth and the arc radius of the arc permanent magnet are analyzed parametrically,and the chamfer size of the auxiliary tooth and the small tooth width of the semi-open slot are analyzed by full factor.Based on the simulation results,a new PMLSM with unequal tooth width is proposed.Taking the new tooth unequal width structure as the research object,a stratified optimization scheme is proposed.Firstly,Taguchi is used to quickly screen the key experimental factors,and central composite design(CCD)is used to build the response surface method(RSM)based on the key factors.Finally,the motor optimization is completed by combining multiobjective particle swarm optimization(MOPSO).By comparing the two traditional optimization schemes,the effectiveness and superiority of the new optimization scheme are verified.Further,the rationality of the design is verified by comparing the performance of the initial structure.Make a prototype and carry out experimental verification.The prototype is made according to the size results of the optimal scheme,and the corresponding experimental tests are carried out.The experiments of no-load back electromotive force,output thrust and no-load positioning force are carried out to verify the effectiveness and correctness of the design and optimization.