Pre- and Post-Fault Tolerant Operation of a Six-Phase PMSM Motor Using FCS-MPC Without Controller Reconfiguration

This paper proposes a model predictive control scheme based remedial control for the single-phase open-circuit fault of an asymmetrical six-phase PMSM machine. The proposed strategy adopts the normal vector space decomposition transformation matrix without reconfiguring the controller topology. The key is to derive the perturbation term of the prediction vectors in α-β and x-y subspace, which is based on the difference of the faulty phase voltage under healthy and faulty condition. Through the compensation of the prediction vectors, the predictive model can be accurately described in the faulty condition. Thus, the current variables in the next instant is accurately predicted and the torque fluctuation is suppressed. Finally, the experimental results are provided to verify the validity of the proposed method on pre- and post-fault tolerant operation.