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Losses due to the transverse component of flux density in grain oriented electrical steels

A. J. MOSES1,* , S. N. KONADU1, S. ZUREK1

Affiliation

  1. Wolfson Centre for Magnetics, Cardiff University, Queen’s Buildings, Newport Rd. Cardiff, CF24 3AA, Wales UK

Abstract

Grain-oriented electrical steel is widely used as the magnetic core material in energy efficient power transformers. The AC performance of a material in strip form magnetized along its rolling direction is measured in a standardized Epstein frame. The principle of the measurement method depends on magnetization being completely aligned along the longitudinal direction of the strips. However mis-oriented grains are subject to small components of flux change at angles to the rolling direction causing additional loss which the standard measurement method does not detect. This paper describes how orthogonal sensors were used to detect and quantify such components of loss in conventional grain-oriented steel magnetized along its rolling direction. Additional localized losses associated with these components are found to vary greatly from grain to grain but may contribute an additional 10 % to the conventionally measured loss. Implications of this effect are considered in the paper..

Keywords

Electrical steel, Iron loss, Magnetic measurements, Experimental methods.

Submitted at: March 13, 2008
Accepted at: May 14, 2008

Citation

A. J. MOSES, S. N. KONADU, S. ZUREK, Losses due to the transverse component of flux density in grain oriented electrical steels, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 5, pp. 1110-1114 (2008)