Fault-tolerance Control For Single-winding Bearingless Switched Reluctance Motor

Bearingless switched reluctance motor (BSRM) integrates functions of rotation and levitation. Ithas potential application prospect in some fields such as aerospace. This dissertation focuses onsingle-winding bearingless switched reluctance motor. Due to its simple structure and flexible control,single winding technology attracts more and more attention.In order to improve the reliability and fault-tolerant capability of BSRM, fault-tolerant control ofopen-winding fault in single-winding BSRM is investigated. The main contents are concluded asfollow:Firstly, a new model considering two-phase coupling is proposed which is suitable for bothsingle-and double-phase excitation. The validity of the proposed model is verified by the finiteelement method (FEM). This model provides theoritical foundation for compensation ofopen-winding fault. Subsequently, after clarifying typical faults occurred in single-winding BSRM,the compensation methods for levitation force are dicussed. The analyzed faults are modeled andsimulated via the FEM. Then, the optimized compensation methods for levitation force are proposedand verified.Based on fore mentioned results, different mathematical models of single-tooth-windingopen-circuited fault can be unified by using model considering two-phase coupling. The mathematicalmodel is also suitable for other faults. Finally, a unified compensation control strategy for levitationforce and torque is proposed aiming at single-tooth-winding open-circuited fault. The developedcontrol strategy and mathematical model are verified by the simulation and experiment results whichalso prove the validity of the unified model.