Title: Design of fault-tolerant observer for brushless DC motor under rotor eccentricity fault

Authors: Shihao Liu; Kexin Xing; Yegui Lin; Wei Dong

Addresses: College of Information Engineering, Zhejiang University of Technology, Hangzhou, 310023, China ' College of Information Engineering, Zhejiang University of Technology, Hangzhou, 310023, China ' College of Information Engineering, Zhejiang University of Technology, Hangzhou, 310023, China ' State Key Laboratory of Robotics and Systems, Harbin Institute of Technology, Harbin, 150080, China

Abstract: The traditional sliding mode observer (SMO) cannot accurately observe the back-electromotive force (back-EMF) values when the brushless DC motor (BLDCM) has rotor eccentricity fault. In order to solve the problem, the influence of static eccentricity fault on inductance and back-EMF is analysed, and a fault-tolerant observer is designed in this paper. The fault-tolerant observer uses the Lyapunov stability theory to identify the phase-to-phase inductance parameters online, and is based on the traditional SMO. According to the phase-to-phase inductance identification values, the SMO coefficient matrix is adjusted in real time. Simulation results show that the designed fault-tolerant observer can accurately observe the phase-to-phase back-EMF values of BLDCM under the rotor eccentricity fault condition.

Keywords: brushless DC motor; BLDCM; rotor eccentricity fault; fault-tolerant observer; sliding mode observer; SMO; parameter identification.

DOI: 10.1504/IJMIC.2021.123384

International Journal of Modelling, Identification and Control, 2021 Vol.39 No.1, pp.11 - 18

Received: 20 Mar 2021
Accepted: 11 Apr 2021
Published online: 13 Jun 2022 *

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