Abstract
In this paper, a novel flux switching permanent magnet (FSPM) machine with alternative flux bridges is proposed to achieve a larger torque density than regular FSPM machine, especially for high pole ratio (ratio of rotor tooth number to winding pole pair number) FSPM machine. The proposed FSPM machine has the same rotor, PMs, and winding structure, but different stator yoke configuration with the conventional FSPM machine. In the proposed FSPM machine, the flux bridges are placed at the top of stator yoke as Cshaped, which can increase the main working harmonic field and reduce the flux barrier effect. First, the operational principle and influence of pole ratio on flux barrier effect are introduced. Then, three proposed FSPM machines with different pole ratios are investigated in torque characteristics considering the effects of split ratio and flux bridge width factor. Finally, the electromagnetic performances of the conventional and proposed FSPM machines are compared by finite element analysis (FEA) in terms of flux density, back-electromotive force (EMF), torque characteristics and overload capability.
Published Version
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