Coupling Simulation Of Multi Physical Field And Experimental Investigation For A Mechanically Variable Flux Axial Flux Permanent Magnet Synchronous Machine

Mechanically variable flux axial field permanent magnet synchronous machine(MVFAFPMSM) is a kind of novel machine, of which the magnetic field can be regulated by additional mechanically flux-weakening device. The structure characteritics and operating principle of MVFAFPMSM are studied in this thesis. Based on the theoretical research, the co-simulation analysis of mechanical dynamics, electromagnetic field and thermal field are carried out by compute aided engineering(CAE) software. In order to verify the correntness of simulation analysis, a prototype is made and tested. All these results have an important significance to theoretical research and value to engineering application.The main works and achievements of this thesis are as follow:1. Analysis of structure and operating principle. The structure characteristics, winding distribution and equivalent magnetic circuit model of MVFAFPMSM are analyzed in detail. According to the basic theory of mechanical dynamics and law of electromagnetic induction, the operating principle and mechanically flux-weaking principle are deeply analyzed.2. Mechanical dynamics simulation and study of flux weaking capability. The cam angular acceleration and spring deformation at different speed, and the changing rule of mechanical displaced angle between rotors are obtained in virtual prototype technology based on ADAMS. The magnetic field distribution, winding flux linkage and EMF of at different displaced angles are calculated by finite element method in order to obtain the flux weaking capability, which validates the correntness mechanically flux-weaking theory.3. Magnetic-thermal coupling simulation. The 3D finite element model is built and the copper loss, ron loss and PM loss of MVFAFPMSM at different speeds and load conditions are calculated by Ansoft Maxmell. The 3D magnetic-thermal model is built by using loss data as heat source with ANSYS Workbench to study the thermal field distribution.4. Manufacture and experimental study of prototype. The prototype is manufactured in accordance with basic parameter and processing drawing. The testing platform is built and the basic performances are tested, including EMF and flux-weaking properties, etc., which verify the effectiveness of design and simulation analysis.