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Detection of bearing faults in asynchronous motors using Luenberger speed observer

Trajin, Baptiste and Régnier, Jérémi and Faucher, Jean Detection of bearing faults in asynchronous motors using Luenberger speed observer. (2008) In: 34th Annual Conference of IEEE Industrial Electronics (IECON 2008), 10 November 2008 - 13 November 2008 (Orlando, United States).

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Official URL: https://doi.org/10.1109/IECON.2008.4758451

Abstract

This paper deals with the application of Luenberger speed observer for the detection of damaged rolling bearings in asynchronous machines. Vibration monitoring of mechanical characteristic frequencies related to the bearings is widely used to detect faulty operations. However, vibration measurement is expensive and can not always be performed. An alternative is to base the monitoring on the available electrical quantities e.g. the machine stator current which is often already measured for control and protection purposes. This work investigates another detection approach using estimated variables such as mechanical rotating speed. Considering that bearing faults induce load torque oscillations, a theoretical stator current model in case of load torque oscillations demonstrates the presence of phase modulations. Then, a theoretical estimated rotor flux and speed model in case of load torque oscillations demonstrates the presence of harmonics related to load torque oscillations. These components appear in the estimated speed spectrum and can be used for detection purposes. Measurements show that speed spectral energy is modified in specific frequency ranges corresponding to bearing faults. A fault detector is then proposed. The efficiency of the indicator is studied on long data records of measurements for different operating conditions. The investigated indicator proves that the detection of bearing faults is ensured by using estimated mechanical speed.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Thanks to the IEEE (Institute of Electrical and Electronics Engineers). This paper is available at: https://ieeexplore.ieee.org/document/4758451 “© 2008 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
HAL Id:hal-02299479
Audience (conference):International conference proceedings
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:27 Sep 2019 15:32

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