Multiaxial Magneto-Mechanical Interactions in Electrical Steel Sheets

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Journal Title
Journal ISSN
Volume Title
School of Electrical Engineering | Doctoral thesis (article-based) | Defence date: 2018-11-23
Date
2018
Major/Subject
Mcode
Degree programme
Language
en
Pages
106 + app. 52
Series
Aalto University publication series DOCTORAL DISSERTATIONS, 200/2018
Abstract
This thesis studies multiaxial magneto-mechanical interactions in electrical steel sheets with particular attention to non-oriented electrical steel sheets. Commonly, during the magneto-elastic analysis of electromagnetic applications only uniaxial stress models are used where the effect of multiaxial stress is often neglected. A new rotational single sheet tester (RSST) that is capable of applying arbitrary in-plane magneto-mechanical loading to steel sheets is designed and manufactured. Experiments on a non-oriented electrical steel sheet are performed for analyzing the effect of multiaxial stress on magnetic properties and iron losses in the material. Performed experiments reveal that the effect of multiaxial stress on magnetic properties and iron losses can be much more significant than that of uniaxial stress. A simplified multiscale (SM) and a macroscopic Helmholtz energy based (HE) model are used to model the multiaxial magneto-mechanical behavior of non-oriented electrical steel sheets and their prediction capabilities are compared when limited measurement data is available for identification. The models were studied for modeling both anhysteretic and hysteretic behavior of three different materials that were characterized by different measurement setups. Comparison of the modeling results to the measured results shows that the SM model is accurate for certain cases, whereas the HE model is successful for all three materials.  In order to predict the effect of multiaxial stress on hysteresis and excess losses, a stress dependent iron loss model is developed utilizing statistical loss theory. The model is verified with measurements obtained from the manufactured RSST. For validation purposes, both the HE model and the developed loss model is implemented to a 2D finite element model of a transformer that is under mechanical stress. The applicability of the models is proven by comparing the modeling results to the measurements. It is concluded that if mechanical stresses are present in an application, using conventional methods to calculate the losses can lead to inaccurate results.
Description
Supervising professor
Belahcen, Anouar, Prof., Aalto University, Department of Electrical Engineering and Automation, Finland
Thesis advisor
Rasilo, Paavo, Asst. Prof., Tampere University of Technology, Finland
Martin, Floran, Dr., Aalto University, Department of Electrical Engineering and Automation, Finland
Keywords
electrical steel sheets, finite element analysis, iron losses, magneto-mechanical effects
Other note
Parts
  • [Publication 1]: Ugur Aydin, Paavo Rasilo, Deepak Singh, Antti Lehikoinen, Anouar Belahcen, Antero Arkkio. Coupled Magneto-Mechanical Analysis of Iron Sheets Under Biaxial Stress. IEEE Transactions on Magnetics, Volume 52, No. 3, pp. 1-4, March 2016.
    DOI: 10.1109/TMAG.2015.2496207 View at publisher
  • [Publication 2]: Ugur Aydin, Floran Martin, Paavo Rasilo, Anouar Belahcen, Ari Haavisto, Deepak Singh, Laurent Daniel, Antero Arkkio. Rotational Single Sheet Tester Device for Multiaxial Magneto-Mechanical Effects in Steel Sheets. IEEE Transactions on Magnetics, Submitted for publication, 9 pages, December 2017
  • [Publication 3]: Ugur Aydin, Paavo Rasilo, Floran Martin, Anouar Belahcen, Laurent Daniel, Ari Haavisto, Antero Arkkio. Effect of Multi-axial Stress on Iron Losses of Electrical Steel Sheets. Journal of Magnetism and Magnetic Materials, vol. 469, pp. 19-27, January 2019.
    DOI: 10.1016/j.jmmm.2018.08.003 View at publisher
  • [Publication 4]: Ugur Aydin, Paavo Rasilo, Floran Martin, Deepak Singh, Laurent Daniel, Anouar Belahcen, Mahmoud Rekik, Olivier Hubert, Reijo Kouhia, Antero Arkkio. Magneto-mechanical Modeling of Electrical Steel Sheets. Journal of Magnetism and Magnetic Materials, Volume 439, pp. 82-90, October 2017.DOI: 10.1016/j.jmmm.2017.05.008
  • [Publication 5]: Ugur Aydin, Paavo Rasilo, Floran Martin, Deepak Singh, Laurent Daniel, Anouar Belahcen and Antero Arkkio. Modeling the Effect of Multiaxial Stress on Magnetic Hysteresis of Electrical Steel Sheets: A Comparison. IEEE Transactions on Magnetics, Volume 53, No. 6, pp. 1-4, June 2017.
    DOI: 10.1109/TMAG.2017.2658676 View at publisher
Citation