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

Bearingless switched reluctance motor(BSRM) integrates functions of rotation and levitation. It has potential application prospect in some fields such as aerospace. Due to the simple structure and flexible control of single-winding bearingless switched reluctance motor, single winding technology attracts more and more attention.Based on the conventional strategy of single-winding BSRM and the direct torque control and direct force control(DTC and DFC), fault-tolerant control of winding fault in single-winding BSRM is investigated to improve the reliability of BSRM.Firstly, the mathematical model with compensation for short-circuit fault is established with consideration of two-phase coupling. Then, a compensation strategy for short-circuit fault is proposed based on this compensation mathematical, and a compensation control strategy for torque is investigated. Both of two compensation strategies are verified by the simulation and experiment results.Aiming at the disadvantages of the conventional strategy, this dissertation focuses on the research of DTC and DFC. Based on the existing theory, the strategy of direct torque and levitation force is realized through experiments. Then, fault-tolerant control of open-winding fault in single-winding BSRM is investigated. Combined with the method of levitation force compensation and the control characteristics of DTC and DFC, advantages and disadvantages of several levitation force compensation schemes are analyzed by simulation. Finally, the compensation strategy of open-winding fault is verified by experiment.