New reaching law control for permanent magnet synchronous motor with extended disturbance observer

Wang, Yaoqiang, Feng, Yutao, Zhang, Xiaoguang, Liang, Jun ORCID: https://orcid.org/0000-0001-7511-449X and Cheng, Xian 2019. New reaching law control for permanent magnet synchronous motor with extended disturbance observer. IEEE Access 7 , pp. 186296-186307. 10.1109/ACCESS.2019.2956846

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Abstract

In order to improve the anti-disturbance performance of permanent magnet synchronous motor (PMSM) servo system, a sliding-mode control strategy using a new reaching law (NRL) is proposed. The NRL incorporates power term and switching gain term of the system state variables into the conventional exponential reaching law (CERL), which can effectively suppress the sliding-mode chattering and increase the convergence rate of system state reaching sliding-mode surface. Based on this new reaching law, a sliding-mode speed controller (SMSC) of PMSM is designed. At the same time, to solve the chattering problem caused by the large sliding-mode switching gain, an anti-disturbance sliding-mode speed controller method with an extended sliding-mode disturbance observer (ESMDO), called SMSC+ESMDO method, is developed. The sliding-mode disturbance observer is designed to accurately estimate the motor speed and external load disturbances, and the disturbance estimator is used as a feed-forward to compensate the sliding-mode speed controller (SMSC) to improve the system robustness and reduce the system chattering. Simulation and experimental results show that the proposed compound sliding-mode control strategy can effectively improve the dynamic performance and robustness of the system compared with the PI controller.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Engineering
Publisher:	Institute of Electrical and Electronics Engineers (IEEE)
ISSN:	2169-3536
Date of First Compliant Deposit:	12 February 2020
Date of Acceptance:	19 November 2019
Last Modified:	05 May 2023 17:39
URI:	https://orca.cardiff.ac.uk/id/eprint/129459

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