Finite element analysis and experimental studies on hybird magnetic bearing

Energy storage technology is still a restriction to limit the commercialization of HEV since its high cost, short mileage and long charge time. Flywheel energy storage system(FESS) is a new way to storage energy in HEV, which can solve those problems mentioned above. Magnetic bearing is the key point of FESS. To research the characteristic of axial-active, radial-passive hybrid magnetic bearing, finite element analysis method is introduced to set up the model of axial and radial structure. Forces of different displacement and the possibility of rotor floating are analyzed, and one kind of operating point is obtained. In the final analysis, the whole magnetic bearing is developed, and experiment system is built to get the relations between axial electromagnetism force and axial displacement, and also to get floating current at different axial displacement from experiment. It can be concluded that the results of experiment and simulation are in good agreement. With the comparison between the results of experiment and finite element analysis method, correctness and validity of the finite element analysis method are verified. It provides a calculation method and theoretical reference for the further research of magnetic bearing.