Comparison of thermal stresses developed during transients on a damaged rotor cage

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Conference article in proceedings
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Date
2017
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Mcode
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Language
en
Pages
7
3545-3551
Series
Proceedings of the 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017, IEEE Energy Conversion Congress and Exposition
Abstract
Structural defects in the rotor cage of large electrical machines significantly impact their expected operational lifetime. This work simulates the stresses developed in a damaged rotor cage during different transient profiles and for different sizes of the imperfection. A combined model featuring electrical, thermal and mechanical stages as well as three different meshes reflecting a progressing narrowing of one of the bars in its junction to the end ring are used for this purpose. The results qualitatively agree with a previously presented fatigue test and show that under severe conditions the capability of aluminum to absorb stress is limited, and a state of plastic deformation is rapidly reached. The effect of a possible mitigation strategy is also studied.
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Keywords
finite element analaysis, induction motors, prognostics and health management, rotors, thermal stresses, transient analysis
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Citation
Climente-Alarcon , V , Arkkio , A & Antonino-Daviu , J A 2017 , Comparison of thermal stresses developed during transients on a damaged rotor cage . in Proceedings of the 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017 . IEEE Energy Conversion Congress and Exposition , IEEE , pp. 3545-3551 , IEEE Energy Conversion Congress and Exposition , Cincinnati , Ohio , United States , 01/10/2017 . https://doi.org/10.1109/ECCE.2017.8096631