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Sensors 2017, 17(12), 2833; https://doi.org/10.3390/s17122833

Sliding Mode Observer-Based Current Sensor Fault Reconstruction and Unknown Load Disturbance Estimation for PMSM Driven System

1
College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China
2
College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410000, China
3
Department of Electrical Engineering, Shandong Polytechnic, Jinan 250104, China
*
Author to whom correspondence should be addressed.
Received: 23 September 2017 / Revised: 2 December 2017 / Accepted: 3 December 2017 / Published: 6 December 2017
(This article belongs to the Special Issue Sensors for Transportation)

Abstract

This paper proposes a new scheme of reconstructing current sensor faults and estimating unknown load disturbance for a permanent magnet synchronous motor (PMSM)-driven system. First, the original PMSM system is transformed into two subsystems; the first subsystem has unknown system load disturbances, which are unrelated to sensor faults, and the second subsystem has sensor faults, but is free from unknown load disturbances. Introducing a new state variable, the augmented subsystem that has sensor faults can be transformed into having actuator faults. Second, two sliding mode observers (SMOs) are designed: the unknown load disturbance is estimated by the first SMO in the subsystem, which has unknown load disturbance, and the sensor faults can be reconstructed using the second SMO in the augmented subsystem, which has sensor faults. The gains of the proposed SMOs and their stability analysis are developed via the solution of linear matrix inequality (LMI). Finally, the effectiveness of the proposed scheme was verified by simulations and experiments. The results demonstrate that the proposed scheme can reconstruct current sensor faults and estimate unknown load disturbance for the PMSM-driven system. View Full-Text
Keywords: permanent magnet synchronous motor (PMSM); sliding mode observers (SMOs); current sensor; fault reconstruction; unknown load disturbance estimation permanent magnet synchronous motor (PMSM); sliding mode observers (SMOs); current sensor; fault reconstruction; unknown load disturbance estimation
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Zhao, K.; Li, P.; Zhang, C.; Li, X.; He, J.; Lin, Y. Sliding Mode Observer-Based Current Sensor Fault Reconstruction and Unknown Load Disturbance Estimation for PMSM Driven System. Sensors 2017, 17, 2833.

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