Design Of Permanent Magnet-Salient Iron Composite Pole Linear Synchronous Motor

Permanent magnet linear synchronous motor is widely used in cordless elevator,high-speed logistics,precision machining and other fields,while the important influencing parameters such as thrust density and permanent magnet consumption of traditional permanent magnet linear synchronous motor need to be improved.According to the market demand of high thrust and low-cost linear motor,a permanent magnet-salient iron composite pole linear synchronous motor(PM-SICPLSM)is proposed.It has the advantages of high thrust and low cost,and is suitable for short primary and secondary motors Long sub field.This thesis focuses on the structure characteristics,magnetic circuit model,parameter design,output performance,optimization scheme and temperature effect of the motor.Magnetic circuit and structure analysis of permanent magnet convex iron composite pole linear synchronous motor.A topology of permanent magnet salient iron compound pole linear synchronous motor is proposed,the magnetic circuit model of the motor under no-load operation is established,and the working principle and influencing parameters are analyzed.Based on the U-type permanent magnet salient pole linear motor,PM-SICPLSM determines the winding design,air gap length and secondary structure parameters of the motor.The finite element models of non salient permanent magnet synchronous motor(NS-PMLSM)and PM-SICPLSM are established.The static magnetic field distribution,air gap magnetic density,back EMF,electromagnetic thrust,thrust fluctuation,positioning force and other electromagnetic characteristics of PM-SICPLSM and NS-PMLSM are compared from the perspective of minimizing the amount of permanent magnet;Permanent magnetic cost analysis of PM-SICPLSM and NS-PMLSM based on thrust maximization.The research shows that PM-SICPLSM has more advantages than NS-PMLSM.Carry out multi-objective optimization design for PM-SICPLSM.Taking the PM-SICPLSM thrust fluctuation and thrust as the optimization objective,the sensitivity analysis is carried out,the U-type permanent magnetic chamfer Angle and the permanent magnetizing length are determined as the optimization variables,the constraint conditions are set up,and the response surface model is established,the thrust fluctuation and target function of PM-SICPLSM are fitted.The solution set is obtained by particle swarm optimization algorithm,and the parameters suitable for processing are selected as the optimal solution.Establish PM-SICPLSM temperature field model.The temperature field finite element model of PM-SICPLSM was established by calculating the loss,thermal conductivity and heat dissipation coefficient of each component of PM-SICPLSM,and the temperature distribution of each component of PM-SICPLSM was studied.