Detection and quantification of bar breakage harmonics evolutions in inverter-fed motors through the dragon transform

The problem of detecting and quantifying bar breakage harmonics in inverter-fed induction motors has not been solved by the time–frequency transforms present in the technical literature. The paper proposes a new transform, called dragon transform, to solve this problem. The dragon atoms are defined...

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Bibliographic Details
Published in:ISA transactions 2021-03, Vol.109, p.352-367
Main Authors: Fernandez-Cavero, V., Pons-Llinares, J., Duque-Perez, O., Morinigo-Sotelo, D.
Format: Article
Language:English
Subjects:
Broken rotor bar
Fault diagnosis
Induction motors
Inverter
Time–frequency analysis
Transient analysis
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Summary:The problem of detecting and quantifying bar breakage harmonics in inverter-fed induction motors has not been solved by the time–frequency transforms present in the technical literature. The paper proposes a new transform, called dragon transform, to solve this problem. The dragon atoms are defined with shapes perfectly adapted to the harmonic trajectories in the time–frequency plane, no matter how complex they are, enabling the precise tracing of the harmonics to be detected. A quantification method is also proposed, which obtains for the first time in the technical literature, the time evolutions of the harmonic amplitudes during a complex transient such as the start-up and the steady state of an inverter-fed motor. The transform performance is validated testing the induction motor under different load levels. •Inverter-fed motors diagnosis through the analysis of the startups with optimised atom-based t–f transforms present in the technical literature.•Dragon atoms defined and build with shapes perfectly adapted to the harmonics trajectories to be detected, no matter how complex they are.•Quantification and diagnosis performed obtaining the time evolutions of fault related harmonics amplitudes.
ISSN:0019-0578
1879-2022
DOI:10.1016/j.isatra.2020.10.020