Fault-tolerant Control of Inter-turn Short-circuit Fault for Five-phase Permanent Magnet Synchronous Motor by Deadbeat Current Tracking

When inter-turn short-circuit fault occurs, the short-circuit current increases dramatically, which affects the balance of the motor system and may cause irreversible damage to the whole system in fault condition under long-term operation. To overcome this drawback, a new ITSC fault-tolerant strategy using deadbeat current tracking is proposed. Firstly, aiming for stable output torque, the torque pulsation minimization principle is used to obtain the fault-tolerant reference current under fault conditions. subsequently, the ITSC current is estimated according to the short-circuit circuit model to achieve fault-tolerant operation of the motor. By constructing a model of the motor under fault conditions and using the method of forward Eulerian discretization, the deadbeat current tracking equations are proposed, which achieve the accurate tracking of the alternating fault-tolerant reference current signal. Finally, the driving experimental platform is constructed, and the simulation and experiments verify the correctness and feasibility of the proposed control strategy.