Design Of Axial Flux Variable Flux Permanent Magnet Synchronous Machine With Mechanical Device And Electromagnetic Characteristic Analysis

Axial flux variable flux permanent magnet synchronous machine(AFVFPMSM) with mechanical device is a kind of special machine with field regulation, which combined the virtues of axial flux machine and variable flux permanent magnet machine with mechanical device, and same typical topological structures of VFPMSM are presented in this paper. The operation principle of the machine is investigated deeply and the electromagnetic design theory is explored. 3-D magnetic field distribution is analyzed and the electromagnetic parameters of the machine are calculated accurately, and all kinds of losses are studied. All these works lay theoretical and technical foundations for this type of machine applying in areas such as electric vehicle and hybrid electric vehicle drive and so on.The main contents and achievements of this thesis are as follows:1. The topological structures and operating principle are analyzed. Compared with airgap-adjustment, stator-displacement and rotor-displacement of AFVFPMSM, a kind of model is designed with a simple structure, reliable and effective field regulation. The mechanical device is designed and the mechanical-magnetic coupling simulation is developed.2. The motor design and optimization. Base on the construction features of the new machine, the electromagnetic design theory is explored. The material of stator, rotor and permanent magnets is determined. The calculation method of electromagnetic parameters and mathematical model of the machine is established, and the sizes of permanent magnets are optimized.3. FEA and calculation of electromagnetic characteristics. Based on the motor design software Maxwell, the 3D finite element analysis model of a new machine is built. The magnetic field distributions are analyzed at different rotor positions. The electromagnetic characteristics are calculated, including the winding linkage, EMF and inductance. The field control effect is also studied.4. Study of losses. The equation of the copper losses, iron core losses and eddy-current losses in permanent magnets is deduced. Losses distribution is calculated and analyzed by finite element analysis. The change of losses factor at different rotor positions are studied.