Post-fault MTPA Operation Based on Virtual-Signal-Injection Control for Fault-Tolerant Five-Phase IPMSM

This paper presents a post-fault maximum torque per ampere (PF-MTPA) control approach for five-phase interior permanent magnet synchronous machine (FP-IPMSM) under single-phase open-circuit scenario based on virtual-signal-injection to obtain the overall maximum torque output while fault-tolerant control method based on reduced decoupling is obtained to eliminate the torque ripple. The modeling of the motor under open circuit fault of single phase is obtained using reduced decoupling transfer method. A vector-based fault-tolerant control is used to eliminate torque ripple and achieve minimal copper loss. This method injects current harmonies which generate torque that inverted with the fault torque ripple. The MTPA control method is integrated to minimize current under same load torque under post-fault operation. To obtain MTPA control with independence of motor parameters which are different from normal condition, a virtual-signal-injection-based method is introduced. MATLAB/Simulink simulation software is used to prove the effectiveness of PF-MTPA control.