Design and analysis of a novel 12/14 hybrid pole type bearingless switched reluctance motor

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. Due to the short flux path without any reversal flux, compared to the 8/10 hybrid stator pole BLSRM, the output torque is significantly improved. To verify the proposed structure, finite element method (FEM) is employed to analyze characteristics of the proposed and 8/10 hybrid stator pole structure. Based on the analysis, a prototype of the proposed BLSRM is designed and manufactured. Finally, the validity of the proposed structure is verified by the experimental results.