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Reducing core loss of high grain oriented electrical steel by laser scribing

: Gillner, A.; Wissenbach, K.; Vitr, G.; Riehn, H.-D.; Hastenrath, M.; Beyer, E.

Hügel, H. ; International Fluidics Services Ltd. -IFS-, Kempston; Fraunhofer-Institut für Arbeitswirtschaft und Organisation -IAO-, Stuttgart; Fraunhofer-Institut für Produktionstechnik und Automatisierung -IPA-, Stuttgart:
Lasers in Manufacturing. Proceedings of the 5thh International Conference 1988 : 13-14 Sept. 1988 in Stuttgart
Kempston, Bedford: IFS Publ., 1988
ISBN: 1-85423-021-2
International Conference on Lasers in Manufacturing <5, 1988, Stuttgart>
Conference Paper
Fraunhofer ILT ()
core loss; dislocation; elliptical shaped laser beam; reduction of energy consumption; thermal field

In many transformers high oriented electrical steel is used instead of regular grain oriented steel yielding a lower core loss and higher efficiency. A further reduction of the core loss can be achieved by domain refining which can be done either by scratching the electrical sheet with a ball point pen or scribing with a focussed laser beam perpendicularly to the main domain direction. In this paper, we present a domain refining method by means of laser scribing, where the laser induced thermal fields cause the generation of subdomains leading to a sufficient decrease of eddy current loss. The paper presents first results using a comparison of hysteresis loss and eddy current loss before and after the laser treatment.