Fault‐tolerant control technology of symmetrical six‐phase permanent magnet synchronous motor

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, stator combined magnetomotive force (MMF) changes, αβ and z1z2 subspaces are no longer decoupled, conventional vector control causes phase current distortion, harmonic increase, torque fluctuation of motor. To address aforementioned problems, first, mathematical model common neutral symmetric six-phase permanent magnet synchronous in static coordinate system is presented this paper. Second, transformation matrix subspace decoupling proposed, corresponding decreasing order constructed. Third, considering orthogonal remaining dimension after reduced-order expression general single-phase fault obtained, which further extended double-phase fault. Fourth, was tracked controlled by proportional integral resonant (PIR) regulator. Finally, simulation experimental verification performed, results demonstrate that algorithm proposed paper can effectively reduce ripple it good dynamic performance