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<p>A novel sensorless control methodology, leveraging high-frequency orthogonal square-wave voltage injection (HFOSVI) facilitated by an ameliorated enhanced phase-locked loop (ePLL), is introduced in this paper. High-frequency (HF) signals are applied within the stationary reference frame (SRF), rendering the methodology highly suitable for interior permanent magnet synchronous machines (IPMSMs). In response to the issues of prolonged convergence time and compromised stability caused by the use of filters in the signal demodulation process of traditional high-frequency rotating voltage injection (HFRVI), an innovative signal demodulation algorithm based on the dual-integrator enhanced phase-locked loop (DI-ePLL) is proposed. To reduce the complexity of the signal extraction process, orthogonal square-wave injection is employed to replace the rotating sinusoidal injection. The proposed DI-ePLL effectively tracks rotor position and achieves stable convergence, eliminating the double-frequency ripple present in conventional PI phase-locked loops (PI-PLL), with dynamic performance unaffected by the input signal amplitude. By using only the high-pass filters (HPFs) to extract the HF-induced current, the phase shift caused by the HPFs is compensated and eliminated. Finally, the effectiveness of this sensorless control strategy is validated on an experimental platform with a rated power of 1.6&#xa0;kW.</p>

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Sensorless control strategy for PMSM based on orthogonal square-wave injection with an ameliorated ePLL

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Zilong Feng,
  • Bowen Ning,
  • Anran Song

摘要

A novel sensorless control methodology, leveraging high-frequency orthogonal square-wave voltage injection (HFOSVI) facilitated by an ameliorated enhanced phase-locked loop (ePLL), is introduced in this paper. High-frequency (HF) signals are applied within the stationary reference frame (SRF), rendering the methodology highly suitable for interior permanent magnet synchronous machines (IPMSMs). In response to the issues of prolonged convergence time and compromised stability caused by the use of filters in the signal demodulation process of traditional high-frequency rotating voltage injection (HFRVI), an innovative signal demodulation algorithm based on the dual-integrator enhanced phase-locked loop (DI-ePLL) is proposed. To reduce the complexity of the signal extraction process, orthogonal square-wave injection is employed to replace the rotating sinusoidal injection. The proposed DI-ePLL effectively tracks rotor position and achieves stable convergence, eliminating the double-frequency ripple present in conventional PI phase-locked loops (PI-PLL), with dynamic performance unaffected by the input signal amplitude. By using only the high-pass filters (HPFs) to extract the HF-induced current, the phase shift caused by the HPFs is compensated and eliminated. Finally, the effectiveness of this sensorless control strategy is validated on an experimental platform with a rated power of 1.6 kW.