Finite element analysis of a novel bearingless flux-switching permanent magnet motor with the single winding

In this paper, a novel bearingless flux-switching permanent magnet (BFSPM) motor with the single winding is proposed, in which the magnets, suspending winding, and armature windings and PMs are in the stator, while no PMs or windings is in the rotor. Hence, this novel bearingless PM motor can be called as stator PM bearingless motor, which exhibits advantages such as simpler rotor construction and capability of fault tolerant operation, comparing with the traditional bearingless motor with double winding. Its topology structure and radial suspension force principle are introduced firstly. Then, the static characteristics are investigated, including field distributions, air gap magnetic density and torque. The relationship between suspension force and winding currents were calculated. Finally, finite element method (FEM) is used to verify the theoretical analysis results.