FEM approach for diagnosis of induction machines' non‐adjacent broken rotor bars by short‐time Fourier transform spectrogram. Issue 17 (14th May 2019)

• Record Type: Journal Article
• Authors: Panagiotou, Panagiotis A.; Arvanitakis, Ioannis; Lophitis, Neophytos; Antonino‐Daviu, Jose A.; Gyftakis, Konstantinos N.
• Is Part Of: Journal of engineering. Volume 2019:Issue 17(2019)
• Page Start: 4566
• Page End: 4570
• Publication Date: 2019-05-14
• Subjects: condition monitoring -- fault diagnosis -- finite element analysis -- rotors -- induction motors -- asynchronous machines -- Fourier transforms -- electrical faults -- stators; FEM approach -- induction machines -- nonadjacent broken rotor bars -- short‐time Fourier -- rotor electrical faults -- applying condition monitoring -- fault diagnosis -- stator -- rotor cage suffers -- multiple breakages -- nonadjacent positions -- electromagnetic asymmetries -- broken bars -- diagnostic ability -- monitored signals -- steady state -- finite element analysis -- electromagnetic variables -- healthy state -- faulty conditions -- stray flux waveforms -- challenging cases -- rotor breakages -- flux analysis -- fault severity -- voltage 6.6 kV -- power 1.1 MW; Engineering -- Periodicals; Engineering; Electronic journals; Periodicals; 620.005
• DOI: 10.1049/joe.2018.8240
• Languages: English
• ISSNs: 2051-3305

Abstract

Abstract : Rotor electrical faults are an issue frequently encountered when applying condition monitoring and fault diagnosis on induction machines. The detection via the analysis of the stator current becomes challenging when the rotor cage suffers from multiple breakages at non‐adjacent positions. In that case, electromagnetic asymmetries induced by the broken bars can be masked in such a way, that the diagnostic ability is highly likely to be obscured, thus leading to misinterpretation of the monitored signals' signatures. A new approach is proposed in this work to overcome this problem while the motor is at steady state. In this study, an industrial 6.6 kV, 1.1 MW induction motor is simulated with finite element analysis (FEM) and its electromagnetic variables are analysed and studied under healthy state and several faulty conditions. The analysis of the stator current and stray flux waveforms is executed in both the transient and the steady state and aims to diagnose the challenging cases where the rotor breakages are non‐consecutive with regard to their spatial location. The results show the potential of flux analysis to fault severity regardless of the spatial position of the broken bars.