RT info:eu-repo/semantics/article
T1 Very Accurate Time-Frequency Representation of Induction Motors Harmonics for Fault Diagnosis Under Load Variations
A1 Bonet Jara, Jorge
A1 Fernández Cavero, Vanesa
A1 Vedreno Santos, Francisco
A1 Morinigo Sotelo, Daniel
A1 Pons Llinares, Joan
K1 Induction motors
K1 Load oscillations
K1 Signal analysis
K1 Time-frequency transforms
K1 Fault diagnosis
K1 Electrotecnia
K1 Electrical engineering
K1 Ingeniería mecánica
K1 Mechanical engineering
AB Induction motors work under steady-state in many applications. Nevertheless, in some cases they experience periodic load fluctuations, which generate constant frequency harmonics close to variable frequency bar breakage harmonics. In these cases, time-frequency (t-f) transforms are better suited than steady-state analysis since the fault harmonic frequencies change in time. Even if the healthy and faulty frequencies do not overlap in the spectrum, if the speed is unknown, it is difficult to distinguish the constant frequency healthy harmonic from the variable frequency bar breakage harmonic. On the other hand, transient techniques present in technical literature are not precise enough to deal with both the changing frequency of the bar breakage harmonic and a close constant frequency (as the one generated by most of the periodic load fluctuations). To achieve reliable results under these challenging situations, a very precise time-frequency transform must be used, enabling to simultaneously draw the constant and variable frequencies, even if they are very close in the t-f plane. The Dragon-Transform is here proposed to address the problem. It is shown through simulation and experimental results, how it enables to very accurately plot up to five faulty harmonics evolutions, distinguishing at the same time the constant frequency of the load oscillation, traced as a very thin horizontal line. Precision is so high that even the oscillations caused by ripple effect can be observed for the first time in technical literature, enhancing the reliability of the diagnosis performed, and opening the path for a true solution of the problem.
PB Institute of Electrical and Electronics Engineers
SN 0093-9994
YR 2024
FD 2024-02
LK http://hdl.handle.net/10259/9936
UL http://hdl.handle.net/10259/9936
LA eng
DS Repositorio Institucional de la Universidad de Burgos
RD 21-ene-2025