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Speed sensorless control of a bearingless induction motor based on sliding mode observer with improved double power reaching law.

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Title: Speed sensorless control of a bearingless induction motor based on sliding mode observer with improved double power reaching law.
Authors: Su, Yanlong1 (AUTHOR), Yang, Zebin1 (AUTHOR) zbyang@ujs.edu.cn, Sun, Xiaodong2 (AUTHOR), Pan, Wei1 (AUTHOR) 1000002634@ujs.edu.cn
Source: International Journal of Electronics. Feb2026, Vol. 113 Issue 2, p349-365. 17p.
Subjects: Sensorless control systems, Adaptive control systems, Magnetic suspension, Observability (Control theory), Lyapunov functions
Abstract: To improve the slow convergence speed and chattering phenomenon in the traditional sliding mode observer (SMO), a speed sensorless control strategy of a bearingless induction motor (BIM) based on SMO with improved double power reaching law (IDPRL) is proposed. First, the stator current error is selected as the sliding surface, and SMO for the stator current and rotor magnetic flux are constructed. Second, based on the analysis of traditional reaching laws, an IDPRL is designed. To realise the adaptive control of the system state and reduce chattering and convergence time, the state variable is introduced into the IDPRL. Third, the stability of the proposed reaching law is proved by Lyapunov's theorem, and a speed adaptive observer is constructed based on the coupling terms to achieve accurate observation of the motor speed. Finally, simulations are conducted on the Matlab/Simulink platform, and experimental validation is performed on a prototype. The results show that the proposed speed sensorless control strategy not only improves the accuracy of the speed estimation but also reduces the chattering and convergence time, as well as has good suspension performance. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:To improve the slow convergence speed and chattering phenomenon in the traditional sliding mode observer (SMO), a speed sensorless control strategy of a bearingless induction motor (BIM) based on SMO with improved double power reaching law (IDPRL) is proposed. First, the stator current error is selected as the sliding surface, and SMO for the stator current and rotor magnetic flux are constructed. Second, based on the analysis of traditional reaching laws, an IDPRL is designed. To realise the adaptive control of the system state and reduce chattering and convergence time, the state variable is introduced into the IDPRL. Third, the stability of the proposed reaching law is proved by Lyapunov's theorem, and a speed adaptive observer is constructed based on the coupling terms to achieve accurate observation of the motor speed. Finally, simulations are conducted on the Matlab/Simulink platform, and experimental validation is performed on a prototype. The results show that the proposed speed sensorless control strategy not only improves the accuracy of the speed estimation but also reduces the chattering and convergence time, as well as has good suspension performance. [ABSTRACT FROM AUTHOR]
ISSN:00207217
DOI:10.1080/00207217.2025.2501296