| With the rapid development of power devices, the doubly salient motors have been studied extensively, on the basis of that, flux-switching permanent magnet (FSPM) machines have been developed. Both permanent magnet and winding are housed in the stator while the rotor is without any coil and magnet, which can be used in high speed and high temperature requirement including aerospace or electrical vehicles. On the other hand, it can adopt sinusoidal AC power supply and produce sinusoidal back electromotive force, and FSPM machine is used in variety of AC variable speed field. Therefore, there is more concern paid in FSPM machine, the analysis of the magnetic field and experimental studying have more practical significances.The purpose of this thesis is to research magnetic field distribution, air-gap flux density, permanent magnet flux-linkage, back-electromotive force and torque of a 12/10- pole FSPM machine.Firstly, the background and significance of FSPM machine research were described. Secondly, the structure, working principle and mathematical model of FSPM machine were analyzed. Thirdly, magnetic field distribution, cogging torque, end effect and torque were analyzed by using full field region three-dimensional finite element magnetic (3D-FEM) to build a physical model of the 12/10-pole FSPM machine. The calculated results show that FSPM machine produces the sinusoidal back-electromotive force, high air-gap flux density and high torque, which verifies the rationality of FSPM machine design. Fourthly, due to double salient pole structure causing bigger cogging torque, which has bad influence on output torque, the experiment was conducted on the prototype. Experiment results match with the simulation results. Finally, the program of electromagnetic calculation was designed by Matlab, whose results combine with the simulation, and verify the electromagnetic parameters of FSPM.This thesis has built a three-dimensional mathematical model based on the parameters of a given prototype, which realizes the correctness of the 3D-FEM analysis and verifies the reasonableness of the motor design, besides the back-electromotive force and cogging torque of simulation analysis are coincide with the experiment results. For further research, the electromagnetic calculation provides theoretical significance and application value. |
