CHANGES IN ELECTRICAL STEEL SHEETS INDUCED BY HEAT TREATMENT

1,3 BULÍN Tomáš
Co-authors:
2 ŠVÁBENSKÁ Eva 2 HAPLA Miroslav 1 ONDRŮŠEK Čestmír 2,3 SCHNEEWEISS Oldřich
Institutions:
1 Brno University of Technology, Faculty of Electrical Engineering and Communication, Technická 3058/10, 616 00 Brno, Czech Republic
2 Institute of Physics of Materials ASCR, Žižkova 22, 616 62 Brno, Czech Republic
3 CEITEC IPM, Institute of Physics of Materials ASCR, Žižkova 22, 616 62 Brno, Czech Republic
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
743-748
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
27 views / 11 downloads
Abstract

Surface coating of electrical steel sheets is very important due to minimizing eddy current losses in electrical machines. The quality of coating can differ according to the composition. The coating layer has limited heat stability and after crossing of the guaranteed temperature it can be significantly degraded and its insulation properties may change importantly. The aim of this study is to describe changes in parameters of magnetic behavior of the non-oriented Si electrical steel sheet due to degradation of the coating by annealing in air. The parameters were acquired from the measuring of magnetic hysteresis loops on two types of samples with different excitation. The basic information on structure was obtained by optical microscopy. Acquired data are compared between samples with the damaged coating layer by annealing and the original coating layer. The results are discussed from the point of view of the possibility of using sheets with damaged insulation in electrical machines.

Keywords: surface coating, magnetic properties, annealing, degradation
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