Research On The Variable Magnetic Permeability Network And Optimal Design Of Transverse Flux Permanent Magnet Linear Motor

As a novel linear machine,the merits of Transverse Flux Permanent Magnet Linear Machine(TFPMLM)different from other traditional linear machines are as follows: there is no competition between the space requirement of flux carrying core irons and the space occupied by armature windings,so this increases the design flexibility.The other benefit of the TFPMLM is that it can increase the force density with increasing the number of stator segment for given geometrical dimension.The magnetic load and the electric load are decoupled in TFPMLM,which has a broad application prospect in the field of low speed and high thrust.The main contents include the following four aspects:The basic structure of TFPMLM with flux-concentrated is introduced,and the working principle of TFPMLM is explained by analyzing its three-dimensional magnetic circuit.The flux distribution,no-load winding flux linkage and back EMF characteristics of this motor are analyzed.According to the principle of this motor,the dimensional structure equation and the thrust expression of the TFPMLM.The equivalent air-gap permeability model,the equivalent magnetic circuit model of salient pole plane structure and the complete variable permeability magnetic network model(VPMNM)are established successively by analyzing the magnetic flux distribution between the relative positions with stator and mover.The local saturation depth factor is introduced to reflect the degree of magnetic circuit saturation at different positions of the stator.The magnetic linkage results of the VPMNM and the3D-FEM are compared and analyzed.The experimental platform of the prototype was developed.The results of back EMF calculation of the model of VPMNM,finite element model and no-load experiment of prototype are compared and analyzed.The results of VPMNM are in good agreement with the results of finite element calculation,and the correctness of the VPMNM is proved.The proposed parameter optimization design method based on Taguchi is used for the multi-objective optimization design of TFPMLM,and the range and level of design parameters used in Taguchi are analyzed in detail.According to the design principle of Taguchi,the orthogonal test matrix is established and the test matrix is solved by FEM.The change trend and weight of each design parameter change on the motor performance index are analyzed,and the optimization scheme of the multi-objective optimal design of the motor is derived.The effectiveness of the method is verified by the FEM.Taking thrust density,thrust ripple and power factor as optimization objectives,the sensitivity analysis of the optimal variables is carried out,and the response surface model(RSM)based on Box-Behnken method is constructed by selecting the optimal variables with significant sensitivity value.The optimal structural parameters of the machine are obtained by solving the RSM and generating a set of Pareto solutions adopted by MPSO.The non-significant variables can adopt the optimal results of single parameter optimization.The electromagnetic performance of the optimized machine is calculated and analyzed by 3D-FEM,and the effectiveness of the multi-objective optimization design method based on the RSM and MPSO is verified.