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Comparison of thermal stresses developed during transients on a damaged rotor cage
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A4 Artikkeli konferenssijulkaisussa
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en
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7
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Proceedings of the 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017, pp. 3545-3551, 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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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