Analysis And Optimization Of Double-C Stator Flux Concentrated Rotor Transverse Flux Permanent Magnet Motor

Transverse Flux Permanent Magnet Motor(TFPMM)is a new type of structure motor whose flux direction is perpendicular to the direction of rotation of the rotor.This motor solves the contradiction of traditional motor between increasing air gap flux and increasing winding current.Its high torque density and high power density have become hotspots in motor design and related research.Based on the electromagnetic field analysis and optimization design of the motor,the basic parameters of DSFCR-TFPMM,electromagnetic field distribution and permanent magnet eddy current loss are analyzed and studied in detail by theoretical analysis and finite element simulation in this paper.The basic structure and working principle of DSFCR-TFPMM are expounded,and the advantages of DSFCR-TFPMM compared with traditional TFPMM are analyzed.The three-dimensional finite element model of DSFCR-TFPMM is established by using MAXWELL finite element software.The no-load back EMF,no-load air gap flux density,electromagnetic torque,co gging torque and electromagnetic field distribution are calculated.At the same time,the following two aspects of research work have been done on the problem of serious magnetic flux leakage and large eddy current loss of permanent magnet:1.For the serious magnetic flux leakage of transverse flux motor,a method to reduce magnetic flux leakage of DSFCR-TFPMM by changing section shape of the stator teeth is proposed.The leakage coefficient under different stator teeth shape is compared and analyzed.Taguchi method is used to optimize the size of stator specifically.When the inner and outer radius of stator are constant,leakage coefficient is taken as the optimization target,and radius of the circle where stator tooth is located,thickness of air gap between stator and rotor and width of stator tooth are selected as the test factor.The best size of stator in reducing magnetic flux leakage is obtained by analyzing the orthogonal experiment results.The air gap flux density,electromagnetic torque,power and efficiency of motor between pre and post improvement are analyzed and compared,and the feasibility of optimization method is verified.2.The eddy current loss of permanent magnet of single-phase DSFCR-TFPMM is calculated and analyzed.The reason of eddy current loss of permanent magnet is expounded.Based on the principle of electromagnetic shielding,it is proposed to add copper layer inside rotor to suppress the harmonic component from entering permanent magnet so as to reduce the eddy current loss.Finally,the effects of copper layers with different thicknesses on eddy current loss of the rotor is analyzed and compared,and the optimal thickness of copper layer is obtained.