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Disturbance rejection control for PMSM using integral sliding mode based composite nonlinear feedback control with

En Lu1, Wei Li2, Shibo Wang2

  • 1School of Agricultural Engineering, Jiangsu University, No. 301 Xuefu Road, Zhenjiang 212013, China; School of Mechatronic Engineering, China University of Mining and Technology, No. 1 Daxue Road, Xuzhou 221116, China.

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|March 7, 2021
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Summary

This study introduces a new control method for permanent magnet synchronous motor (PMSM) drives. The robust speed controller and load observer effectively reject disturbances and improve performance, even with changing loads.

Keywords:
Composite nonlinear feedback controlDisturbance rejectionIntegral sliding mode controlPMSMSliding mode observer

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Area of Science:

  • Electrical Engineering
  • Control Systems
  • Robotics

Background:

  • Permanent magnet synchronous motor (PMSM) drive systems are complex, nonlinear, and prone to parameter variations and external disturbances.
  • Existing control methods often struggle to balance transient performance (rapidity) with robustness against uncertainties and load fluctuations.

Purpose of the Study:

  • To develop a robust speed control method for low-speed, high-torque PMSM drives that enhances disturbance rejection and improves transient performance.
  • To address the inherent nonlinearities, strong coupling, and susceptibility to parameter perturbations in PMSM systems.

Main Methods:

  • A robust speed controller combining composite nonlinear feedback (CNF) for transient performance and integral sliding mode (ISM) for robustness.
  • A sliding mode observer (SMO) with fuzzy control to reduce chattering and estimate disturbances for feed-forward compensation.
  • Integration of a load observer to compensate for load mutations and wide-ranging load variations.

Main Results:

  • The proposed method effectively inhibits system overshoot and reduces steady-state error, achieving good transient performance.
  • Demonstrated suppression of load disturbances and mutations, indicating superior robustness.
  • Numerical simulations and experimental results validate the effectiveness of the developed control strategy.

Conclusions:

  • The combined robust speed controller and load observer provide a superior solution for controlling low-speed, high-torque PMSM drives.
  • The method offers a significant improvement in handling system uncertainties, external interferences, and load variations compared to traditional approaches.
  • This research contributes to more reliable and efficient operation of PMSM systems in demanding applications.