Compared with the three-phase motor, the six-phase motor has lower torque ripple and higher fault tolerance performance, which makes it widely used in aviation, ships, industrial manufacturing, and other application fields. However, the probability of failure of the polyphase motor system increases with the increase in the number of phases. In order to deal with the open phase fault and power switch fault of the six-phase inverter, a fault diagnosis method for the six-phase inverter based on vector space decoupling (VSD) is proposed. The open phase fault index is first determined according to the VSD decoupling inverse transform and the current constraints. The fault index is then optimized from the perspective of preventing misdiagnosis and improving reliability, and the open phase fault can be diagnosed in one fundamental cycle. In addition, the current trajectory of harmonic plane after switch fault is analyzed, and the back propagation (BP) neural network is used to identify the harmonic plane current trajectory of different types of switch fault. Finally, the correctness and feasibility of the proposed fault diagnosis method are verified by simulations and experiments. The obtained results demonstrate that the proposed method can quickly and accurately locate the open phase fault and switch fault without additional hardware. The proposed method is simple, efficient, and robust.
In comparison with three‐phase motors, multiphase motors have garnered increasing attention owing to their high fault‐tolerant ability. When the motor has an open‐circuit fault, the stator combined magnetomotive force (MMF) changes, αβ and z1z2 subspaces are no longer decoupled, and the conventional vector control causes phase current distortion, harmonic current increase, and torque fluctuation of the motor. To address the aforementioned problems, first, the mathematical model of the common neutral symmetric six‐phase permanent magnet synchronous motor in the static coordinate system is presented in this paper. Second, the transformation matrix of αβ and z1z2 subspace decoupling is proposed, and the corresponding mathematical model of decreasing order is constructed. Third, considering the orthogonal vector of the remaining dimension after the phase fault, the reduced‐order transformation matrix expression of the general single‐phase fault is obtained, which is further extended to the double‐phase fault. Fourth, the harmonic current of the z1z2 subspace was tracked and controlled by the proportional integral resonant (PIR) regulator. Finally, simulation and experimental verification are performed, and the results demonstrate that the fault‐tolerant control algorithm proposed in this paper can effectively reduce the torque ripple and it has good dynamic performance after an open‐circuit fault.
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