JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2017, Vol. 47 ›› Issue (5): 210-214.doi: 10.6040/j.issn.1672-3961.0.2017.175

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Fault diagnosis and fault tolerant control based on sliding mode observer for speed sensor in asynchronous motor

XIE Xiaolong, JIANG Bin*, LIU Jianwei, JIANG Yinhang   

  1. College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, Jiangsu, China
  • Received:2017-02-10 Online:2017-10-20 Published:2017-02-10

Abstract: Aiming at the fault appearing in speed sensor of asynchronous motor in vector control system, a sliding-mode observer based fault diagnosis and fault tolerant control method was proposed. The state space model of asynchronous motor was established by coordinate transformation method, the sliding mode observer was then constructed the stability conditions and speed adaptive law were derived by Lyapunov stability theory. The switching control strategy was designed to guarantee the safety of the induction motor, which changed system working mode into speed sensorless vector control when the residuals were larger than the given thresholds. The developed method could detect faults within 0.2 s and recover the performance of the system, whose rapidity and effectiveness was validated via a simulation experiment.

Key words: induction motors, sliding-mode observer, speed estimation, fault diagnosis, fault-tolerant control

CLC Number: 

  • TM346
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