Fault tolerant DTC for six-phase symmetrical induction machine

In this paper, a new fault tolerant direct torque control (DTC) algorithm for six phase induction machines (6PIM) is introduced. The machine presents two sets of three phase windings spatially shifted by 60 electrical degrees. The aim of the proposed approach consists in computing an average stator voltage vector in order to control the mean values of the stator flux and the electromagnetic torque over a sampling period under open phase. The main advantages are fixed switching frequency, low torque ripples and reduced line current ripples in comparison with classical DTC. Simulation and experimental results show satisfying performances and validate the proposed method.