Optimization for Short-circuit Fault-tolerant Mathematical Model of Bearingless Switched Reluctance Motor

When one winding of the single-winding bearingless switched reluctance motor (SWBSRM) is short-circuited, a continuous radial force for the levitation can be obtained by extending the conduction of the prior energized phase. Based on the force compensation strategy, this paper aims to further improve the fault-tolerant ability of the motor. Optimized fault-tolerant current mathematical model is proposed by considering more constraints. The new model focuses on improving rotation performance with taking the influence factors of levitation force into account. It is more suitable for actual operations as the levitation force changes in real time. As a result, the torque of fault phase is increased without affecting its suspension performance. The rotation stability of the rotor can be enhanced accordingly. The advanced mathematical model can achieve a better performance of both suspension and rotation. Finally, the simulation results verify the validity of the optimized short-circuit fault-tolerant current mathematical model with MATLAB/Simulink software.