Comparison of Magnetostriction Models for Use in Calculations of Vibrations in Magnetic Cores

In this paper, the vibrations of the magnetic cores of power transformers due to magnetostriction are studied. To achieve this, a magnetostriction model based on magnetostriction measurements is needed. Two different magnetostriction models are compared, and their advantages and drawbacks are discus...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2008-06, Vol.44 (6), p.874-877
Main Authors: Hilgert, T., Vandevelde, L., Melkebeek, J.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Electrical steel
Exact sciences and technology
Hysteresis
Inclusions
Magnetic cores
Magnetic flux
Magnetic forces
Magnetism
Magnetostriction
Materials science
Mathematical models
Matrix decomposition
neural network (NN)
Other topics in materials science
Physics
Power system modeling
Power transformers
Steel
Tensile stress
transformer
Transformer cores
Transformers
Vibration
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Summary:In this paper, the vibrations of the magnetic cores of power transformers due to magnetostriction are studied. To achieve this, a magnetostriction model based on magnetostriction measurements is needed. Two different magnetostriction models are compared, and their advantages and drawbacks are discussed. The first model is easy to implement, but does not include the hysteresis and the frequency dependency of the magnetostriction. To include these effects, a second model has been developed. This model is more difficult to implement and requires more magnetostriction measurements. As an application, the vibrations of a small power transformer are calculated using both models. By comparing the results, it is shown that the inclusion of hysteresis in the magnetostriction model has a significant impact on the calculated results for the vibrations of the transformer.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2007.916395