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A Modified Phase-Locked Loop with Parameter Self-Tuning Used in the Sensorless Control of Permanent Magnet Synchronous Motors (PMSMs)

Author

Listed:
  • Chung-Wuu Ding

    (Department of Mechanical Engineering, National Central University, Taoyuan 32001, Taiwan)

  • Pi-Cheng Tung

    (Department of Mechanical Engineering, National Central University, Taoyuan 32001, Taiwan)

Abstract

This paper proposes a sensorless field-oriented control (FOC) strategy for permanent magnet synchronous motors (PMSMs), focusing on rotor flux position estimation based on back-electromotive force (back-EMF) signals. The limitations of conventional phase-locked loop (PLL) techniques for rotor flux position estimation along the motor shaft are analyzed, and an enhanced PLL structure is developed to address these deficiencies.In electric vehicle traction applications, precise flux position estimation alone is insufficient; accurate generation of d–q-axis current commands is equally critical. To address this need, a zero-pole-free PI regulator is designed within the PLL module, enabling more accurate flux estimation. Additionally, a gradient-based self-tuning algorithm is employed to identify system parameters, particularly the stator inductance, enabling the controller to optimize current command generation.Comprehensive system-level simulations have been conducted to validate the effectiveness of the proposed sensorless control scheme. Comparative studies demonstrate that the proposed method significantly improves feasibility and robustness for practical PMSM drive applications.

Suggested Citation

  • Chung-Wuu Ding & Pi-Cheng Tung, 2025. "A Modified Phase-Locked Loop with Parameter Self-Tuning Used in the Sensorless Control of Permanent Magnet Synchronous Motors (PMSMs)," Mathematics, MDPI, vol. 13(10), pages 1-20, May.
    • Handle: RePEc:gam:jmathe:v:13:y:2025:i:10:p:1654-:d:1658537
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    References listed on IDEAS

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    1. Shuo Chen & Xiao Zhang & Xiang Wu & Guojun Tan & Xianchao Chen, 2019. "Sensorless Control for IPMSM Based on Adaptive Super-Twisting Sliding-Mode Observer and Improved Phase-Locked Loop," Energies, MDPI, vol. 12(7), pages 1-19, March.
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