Optimization design and analysis of a bearingless flux-switching permanent magnet machine

To solve the thermal and mechanical integrity problems in a traditional rotor permanent-magnet (PM) bearingless machine having magnets on the rotor, this paper investigates a three-phase 12/10 poles bearingless flux-switching permanent magnet machine (BFSPMM) with suspending windings, armature windings and PMs on the stator. The basic structure and the operating principle are introduced. The finite element method (FEM) is used for parameters optimization. The influence of the design parameters, such as rotor tooth width, the stator tooth width, PM magnetization thickness, and gap on the machine performance is investigated. The analysis results show that the electromagnetic torque and suspension forces have been significantly increased with the optimized parameters.