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arXiv · 2607.24633

Current References for Minimum Copper Loss and Torque Ripple in the Full Torque-Speed Range for Symmetrical Six-Phase PMSMs With Nonsinusoidal Back-EMF Under an Open-Phase Fault

Alejandro G. Yepes·Wessam E. Abdel-Azim·Oscar López·Petros Karamanakos·Ayman S. Abdel-Khalik·Jesús Doval-Gandoy
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Abstract

Current-reference generation based on lookup tables (LUTs) is here proposed for star-connected symmetrical six-phase nonsalient PMSMs with nonsinusoidal back-EMF under an open-phase fault. Fourier coefficients for all healthy phases are computed offline, enabling unbalanced nonsinusoidal currents. A lexicographic optimization minimizes torque ripple and then copper loss, subject to torque, zero-current-sum, peak-current, peak-voltage, and torque-ripple constraints. Cogging torque can be included for compensation. Simulations show a higher feasible speed limit: about 30% at low torque and 23% along an example load curve. Finite-element analysis shows a 77% reduction in peak-to-peak torque ripple with cogging-torque compensation.

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Alejandro G. Yepes, Wessam E. Abdel-Azim, Oscar López, Petros Karamanakos, Ayman S. Abdel-Khalik, Jesús Doval-Gandoy. 2026-07-27. Current References for Minimum Copper Loss and Torque Ripple in the Full Torque-Speed Range for Symmetrical Six-Phase PMSMs With Nonsinusoidal Back-EMF Under an Open-Phase Fault. https://arxiv.org/abs/2607.24633

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