Hybrid pole type bearingless switched reluctance motor with short flux path

In this paper, a novel 12/14 hybrid pole type bearingless switched reluctance motor (BLSRM) with short flux path and no flux-reversal in the stator is proposed. The proposed BLSRM has separated rotating torque and radial force poles. Because of independent characteristics between torque and radial force poles, radial force has excellent linearity according to rotor position and independent characteristics of the torque. Therefore, torque control can be decoupled from the radial force control. Moreover, in this motor, 2/3 of the stator poles are used for the toque and short flux paths are taken on and no flux-reversal in the stator core, compared to the existing 8/10 hybrid stator BLSRM, the output torque has been significantly improved. To verify the proposed structure, finite element method (FEM) is employed to compare the static characteristics of the proposed structure and 8/10 hybrid stator BLSRM. Based on the analysis, a prototype is designed and manufactured. Finally, validity of the proposed structure is verified by the simulation results.