Sensorless control for five‑phase PMSMs under normal and open‑circuit fault conditions using super‑twisting sliding mode observers

To enhance system position estimation reliability when a single-phase open-circuit fault occurs, this study provides a sensorless control strategy based on a medium and high-speed super-twisting sliding mode observer (ST-SMO) for a five-phase permanent magnet synchronous motor, in which the space vector pulse width modulation (SVPWM) control strategy is adopted. In this method, a super-twisting sliding mode observer is developed to achieve any two-healthy phase back electromotive force (EMFs) estimation, during normal and open-circuit fault operations, irrespective of parameter variations and external disturbances. Then a phase-locked loop (PLL) is presented to extract the position and the speed of the rotor directly from the estimated two phase back-EMFs. The proposed ST-SMO algorithm achieves strong robustness to various external variations, suppresses system chattering, and enhances the estimation accuracy in the medium and high-speed range. Simulation and experimental results are provided to verify the effectiveness of the proposed method under different load conditions over medium to high-speed ranges.

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Cite this article

[IEEE Style]

G. Liu, A. Farahat, Q. Chen, J. Zhang, X. Wang, "Sensorless control for five‑phase PMSMs under normal and open‑circuit fault conditions using super‑twisting sliding mode observers," Journal of Power Electronics, vol. 23, no. 7, pp. 1098-1110, 2023. DOI: 10.1007/s43236-023-00614-2.

[ACM Style]

Guohai Liu, Abdallah Farahat, Qian Chen, Jiahao Zhang, and Xu Wang. 2023. Sensorless control for five‑phase PMSMs under normal and open‑circuit fault conditions using super‑twisting sliding mode observers. Journal of Power Electronics, 23, 7, (2023), 1098-1110. DOI: 10.1007/s43236-023-00614-2.