Magnetic properties and domain structures in domain refined grain-oriented silicon steel (invited)

Abstract

The present paper is concerned with the development of low-loss grain-oriented silicon steel, and especially with the magnetic properties and domain structures in domain refined grain-oriented silicon steel. The effects of locally induced stress and slight magnetic flux emergence have been examined as possible nucleation centers for effective domain walls which contribute to magnetization. The fundamental phenomena and their origins have been discussed on the bases of experimental facts. It was concluded that these domain refining effects were based upon interactions between subdomains having transverse magnetization, which originate from magnetic free poles and/or internal stress, and tensile stress in silicon steel with orientation near (110)[001]. The features of magnetic properties and domain structures of domain refined grain-oriented silicon steel both for stack and wound cores are described. Finally, a new technique for raising the degree of (110)(001) orientation is introduced, and the approach to minimum loss in grain-oriented silicon steel is discussed.