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Minimum Loss Control of a Five-phase Permanent Magnet Assisted Synchronous Reluctance Motor under Open Phase Fault

In this paper, the efficiency of a five-phase Nd- based permanent magnet assisted synchronous reluctance motor has been analyzed to perform optimal efficiency control under different two-phase open fault (TPF) conditions. Since in a PMaSynRM, the torque is generated primarily due to the saliency, under phase lost conditions, the performance of this machine deteriorates heavily. The major reasons behind this are the 1) phase lost condition creates non-uniform flux distribution in the airgap, 2) remaining phase currents become unbalanced, 3) unexpected current harmonics show up, and 4) optimal control angle shifts from its original. With all these effects, the PMaSynRM performs very inefficiently. Therefore, the maximum efficiency control becomes critical. However, maintaining maximum efficiency in the TPF condition is challenging, which requires a smart, fast, and adaptive control strategy to perform a smooth long-term operation. In this paper, particular attention is given to developing an analytical fault model followed by finite element modeling, which is utilized to calculate the efficiency accurately of the PMa-SynRM under faults. Also, an advanced control method has been adopted to continue the maximum efficiency control in those faults.