Multi-objectiveoptimizationofdouble-sidedlinear Primary Permanent Magnet Vernier Motor

With the continuous development of economy,more and more high and super-high buildings have been built.Elevators,which are indispensable in high buildings,have also developed rapidly.The direct drive elevator system based on linear motor has the characteristics of stable operation,unlimited lifting height and easy to realize one well with multiple elevators.The double side linear primary permanent magnet vernier(DSLPPMV)motor adopts the double side flat structure.The permanent magnet and armature winding are located on the mover.So,when the DSLPPMV motor is applied to the long stroke applications,such as elevators,it has the characteristics of low cost and high thrust density based on it magnetic gear operating principle.Response surface method(RSM)is a statistical and mathematical technique used to find the best fit response of the physical system.Combining the RSM with numerical simulation methods,such as finite element,can realize the corresponding optimal design,which has been recognized as one of the effective methods for electrical engineering research in recently years.In this paper,taking elevator drive as the potential application,the RSM is used to optimize the design of DSLPPMV motor,which not only has clear physical meaning,but also has the advantages of simple implementation,less calculation and short design cycle.The main research content of this thesis mainly includes the following points:1.The structure and winding connection of the DSLPPMV motor are introduced indetail,based on which the working principle of the motor is analyzed using theequivalent magnetic circuit method and the magnetic gear principle,whichconfirms the low speed and high thrust force characteristics of the motor.2.The equivalent magnetic circuit method and the finite element method are used toinitially design some important parameters of the DSLPPMV motor,such as thethickness of the permanent magnet,the width and the height of the secondary sideteeth,based on which initial optimal values and optimizing ranges of differentdimension parameters can be obtained.Then,according to the design demand andexperience,the other parameters,such as permanent magnet material and wirediameter,are selected.3.According to the application background and the especial performances ofDSLPPMV motor,the optimization targets are selected.Combining thesensitivity analysis,the FEA,the central composite design(CCD)and the RSM,amulti-objective optimization method is proposed,based on which the DSLPPMVmotor is optimally designed.4.By the FEA simulation software,the electromagnetic performances ofDSLPPMV motor are calculated and analyzed.The control system platform isestablished,based on which no-load and on-load experiments are carried out.Theexperimental results verify the effectiveness and the correctness of theoreticalanalysis and simulation research.