A DC Bias Suppression Sensorless Control for SPMSM Based on Extended State Observer with Improved Position Estimation Accuracy

Jinpu Lin, Manfeng Dou, Haiyun Jia, Shuhao Yan, Mengxi Dang, Dongdong Zhao () and Zhiguang Hua
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Jinpu Lin: School of Automation, Northwestern Polytechnical University, Xi’an 710072, China
Manfeng Dou: School of Automation, Northwestern Polytechnical University, Xi’an 710072, China
Haiyun Jia: School of Automation, Northwestern Polytechnical University, Xi’an 710072, China
Shuhao Yan: School of Automation, Northwestern Polytechnical University, Xi’an 710072, China
Mengxi Dang: School of Automation, Northwestern Polytechnical University, Xi’an 710072, China
Dongdong Zhao: School of Automation, Northwestern Polytechnical University, Xi’an 710072, China
Zhiguang Hua: School of Automation, Northwestern Polytechnical University, Xi’an 710072, China

Energies, 2025, vol. 18, issue 19, 1-14

Abstract: In sensorless control systems of permanent magnet synchronous motors (PMSMs), the traditional linear extended state observer (LESO) is preferred due to its simplicity and ease of implementation. With the development of PMSM sensorless control systems, the requirements for position estimation performance have increased, and thus, traditional LESOs can no longer meet those needs. To address this issue, this article proposes an estimation method based on an integrally compensated-enhanced linear extended state observer (IC-ELESO) and an improved quadrature phase locked loop (IQPLL) with a third-order LESO. In the back electromotive force estimation scheme, by introducing a compensation loop, the proposed IC-ELESO suppresses DC bias and improves position estimation accuracy compared to traditional LESOs. In the position estimation scheme, the IQPLL combines the third-order LESO with a quadrature phase locked loop (QPLL) to eliminate errors introduced by ramp signals. Finally, a PMSM experimental platform is built to conduct a comparative experiment between the method proposed and the traditional LESO, which verifies the feasibility and superiority of the method proposed in this article.

Keywords: permanent magnet synchronous motor (PMSM); linear extended state observer (LESO); sensorless control; phase locked loop (PLL); DC bias (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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