Some effects of grain boundaries on the field distribution on the surface of grain oriented electrical steels

Issue title: Proceedings of the tenth International Symposium on Applied Electromagnetics and Mechanics ISEM-Tokyo

Article type: Research Article

Authors: Moses, A.J.^{a; *} | Konadu, S.N.^a

Affiliations: [a] Wolfson Centre for Magnetics Technology, School of Engineering, Cardiff University, P.O. Box 925, Cardiff, CF24 0YF, UK

Correspondence: [*] Corresponding author: A.J. Moses, Tel.: +44 029 20876729; Fax: +44 029 20876729; E-mail: [email protected]

Abstract: A non-destructive system using a Hall effect I.C. sensor has been used to measure the distribution of the vertical component of stray magnetic field on the opposite surfaces of a magnetised specimen of high permeability, grain-oriented electrical steel. An optical microscope was used to establish positions of grain boundaries in order to explain differences in field profiles outside the systematic accuracy of measurements. It was found that unlike previously assumed, grain boundaries may not necessarily be perpendicular to the sheet surface so different field distribution may occur. This should be considered when evaluating local power loss from surface sensor movements. Future studies are also necessary to quantify the effect of this phenomenon in the interpretation of surface or bulk properties of electrical steels using surface field sensors.

DOI: 10.3233/JAE-2002-489

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 13, no. 1-4, pp. 339-342, 2002