Fault-Tolerant Control Method for Five-phase PMSM with Multi-mode Configuration and Mode Switching Restriction under Single Open-switch fault

The single open-switch fault is a type of open-circuit fault in electrical machines, which results in the phase current being divided into healthy and fault half cycle, thereby preventing the maintenance of a healthy magnetic field. Based on the motor operation analysis of this fault, this paper proposes a fault tolerant control method for five-phase machine with non-sinusoidal back EMF. A set of multi-mode configuration is proposed to reconstruct a healthy magnetic field distribution in single open-switch fault. It also eliminates the instantaneous torque fluctuations that occur during mode switching between the faulty and healthy half cycle. Besides, the proposed method incorporates both the minimization of copper loss (ML) and the maximization of torque output (MT) as constraints for current reconfiguration, along with their corresponding reconfiguration and derating factors. After the experimental verification, the proposed universal fault-tolerant control method for five-phase motors has the advantages of low torque fluctuation and low copper loss with different constraints.