Suspending force control scheme for bearingless SRM

This paper presents a novel hybrid pole BLSRM(bearingless switched reluctance motor) and its radial force control scheme. The radial force can be produced by the radial force winding which is wound at separated radial force poles. And the rotating torque is produced by the excitation current of torque windings which are wound at torque pole. The proposed radial force control scheme is independent to phase torque winding current. A simple PID controller and look-up table are used to maintain constant rotor air-gap. The proposed BLSRM and its radial force control scheme are verified and experimental results.