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Background/Introduction <p>Active magnetic bearing (AMB) rotor systems require strong anti-disturbance capabilities for stable operation due to their susceptibility to external disturbances and parametric uncertainties. The Active Disturbance Rejection Control (ADRC) framework handles these issues by aggregating various disturbances into a "total disturbance," which is estimated and compensated for by an Extended State Observer (ESO). However, the conventional ESO haslimitations in effectively suppressing high-frequency vibrations caused by rotor imbalance.</p> Purpose <p>This study aims to overcome the aforementioned limitation by proposing an enhanced ADRC strategy that incorporates a Generalized Integrator-based Extended State Observer (GI-ESO) to improve the suppression of both low- and high-frequency disturbances in AMB rotor systems.</p> Methods <p>A generalized integrator (GI) was integrated into the disturbance estimation loop of the ESO. The resonant frequency of the GI was precisely tuned to match the rotor's rotational frequency using a second-order generalized integral frequency-locked loop (SOGI-FLL). A frequency-domain analysis was performed to assess the impact of different parameters on the stability of the closed-loop system. The proposed method was validated through simulations and experimental acceleration tests from 0 to 6000 rpm.</p> Results <p>Simulation results confirmed that the proposed GI-ESO achieves superior suppression of both low- and high-frequency disturbances compared to the conventional ESO. Experimental validation demonstrated that the GI-ESO reduces the vibration amplitude of the AMB rotor system by approximately 17.71% relative to the standard ESO.</p> Conclusions <p>The proposed ADRC strategy with GI-ESO effectively enhances the anti-disturbance performance of AMB rotor systems, particularly in suppressing high-frequency vibrations caused by imbalance. The method demonstrates practical efficacy and represents a significant improvement over conventional ESO-based approaches.</p>

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Research on Disturbance Rejection of Active Magnetic Bearing System Based on Generalized Integrator-Extended State Observer

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Zhendong Hong,
  • Yingqing Cao,
  • Chaowu Jin,
  • Boyuan Xu,
  • Jin Zhou,
  • Jun Gao

摘要

Background/Introduction

Active magnetic bearing (AMB) rotor systems require strong anti-disturbance capabilities for stable operation due to their susceptibility to external disturbances and parametric uncertainties. The Active Disturbance Rejection Control (ADRC) framework handles these issues by aggregating various disturbances into a "total disturbance," which is estimated and compensated for by an Extended State Observer (ESO). However, the conventional ESO haslimitations in effectively suppressing high-frequency vibrations caused by rotor imbalance.

Purpose

This study aims to overcome the aforementioned limitation by proposing an enhanced ADRC strategy that incorporates a Generalized Integrator-based Extended State Observer (GI-ESO) to improve the suppression of both low- and high-frequency disturbances in AMB rotor systems.

Methods

A generalized integrator (GI) was integrated into the disturbance estimation loop of the ESO. The resonant frequency of the GI was precisely tuned to match the rotor's rotational frequency using a second-order generalized integral frequency-locked loop (SOGI-FLL). A frequency-domain analysis was performed to assess the impact of different parameters on the stability of the closed-loop system. The proposed method was validated through simulations and experimental acceleration tests from 0 to 6000 rpm.

Results

Simulation results confirmed that the proposed GI-ESO achieves superior suppression of both low- and high-frequency disturbances compared to the conventional ESO. Experimental validation demonstrated that the GI-ESO reduces the vibration amplitude of the AMB rotor system by approximately 17.71% relative to the standard ESO.

Conclusions

The proposed ADRC strategy with GI-ESO effectively enhances the anti-disturbance performance of AMB rotor systems, particularly in suppressing high-frequency vibrations caused by imbalance. The method demonstrates practical efficacy and represents a significant improvement over conventional ESO-based approaches.