SOGI based finite position set‑phase locked loop for sensorless control of PMSMs

The conventional sensorless control of permanent magnet synchronous motor (PMSM) based on the sliding mode observer (SMO) and the quadrature phase-locked loop (QPLL) is widely used. A method using the finite-position-set phase-locked loop (FPS-PLL) to replace the QPLL has been proposed due to its good dynamic response without the need for parameter adjustment. However, the anti-harmonic capacity of the FPS-PLL is poor, which results in harmonic effects on the estimated rotor position. In this article, the estimated error caused by the FPS-PLL is theoretically analyzed and a second-order generalized integrator (SOGI) based FPS-PLL is studied. In addition, the chattering problem present in the conventional first-order SMO is improved. The effectiveness of this method is validated through experimental results.

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Cite this article

[IEEE Style]

X. Wu, B. Wu, J. Li, S. Lu, C. Li, J. Li, H. Yue, X. Zhang, "SOGI based finite position set‑phase locked loop for sensorless control of PMSMs," Journal of Power Electronics, vol. 26, no. 1, pp. 77-87, 2026. DOI: 10.1007/s43236-025-01063-9.

[ACM Style]

Xiang Wu, Boliang Wu, Jieguang Li, Shanjun Lu, Chao Li, Jia Li, Haifeng Yue, and Xiao Zhang. 2026. SOGI based finite position set‑phase locked loop for sensorless control of PMSMs. Journal of Power Electronics, 26, 1, (2026), 77-87. DOI: 10.1007/s43236-025-01063-9.