A Technique for Frequency Converter-Fed Asynchronous Motor Vibration Monitoring and Fault Classification, Applying Continuous Wavelet Transform and Convolutional Neural Networks

Tomas Zimnickas, Jonas Vanagas, Karolis Dambrauskas and Artūras Kalvaitis
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Tomas Zimnickas: Department of Power Systems, Kaunas University of Technology, LT-51367 Kaunas, Lithuania
Jonas Vanagas: Department of Power Systems, Kaunas University of Technology, LT-51367 Kaunas, Lithuania
Karolis Dambrauskas: Department of Power Systems, Kaunas University of Technology, LT-51367 Kaunas, Lithuania
Artūras Kalvaitis: Department of Power Systems, Kaunas University of Technology, LT-51367 Kaunas, Lithuania

Energies, 2020, vol. 13, issue 14, 1-21

Abstract: In this article, a type of diagnostic tool for an asynchronous motor powered from a frequency converter is proposed. An all-purpose, effective, and simple method for asynchronous motor monitoring is used. This method includes a single vibration measuring device fixed on the motor’s housing to detect faults such as worn-out or broken bearings, shaft misalignment, defective motor support, lost phase to the stator, and short circuit in one of the phase windings in the stator. The gathered vibration data are then standardized and continuous wavelet transform (CWT) is applied for feature extraction. Using morl wavelets, the algorithm is applied to all the datasets in the research and resulting scalograms are then fed to a complex deep convolutional neural network (CNN). Training and testing are done using separate datasets. The resulting model could successfully classify all the defects at an excellent rate and even separate mechanical faults from electrical ones. The best performing model achieved 97.53% accuracy.

Keywords: convolutional neural networks; deep networks; continuous wavelet transform; asynchronous motor; vibration signals; classification; bearings; short circuit; frequency converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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