Detection and quantification of bar breakage harmonics evolutions in inverter-fed motors through the dragon transform
V Fernandez-Cavero1, J Pons-Llinares2, O Duque-Perez3
1Universidad Europea Miguel de Cervantes, Calle del Padre Julio Chevalier 2, 47012 Valladolid, Spain.
Abstract:
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.
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