GRAIN ORIENTED SILICON STEEL SHEET FOR LOW NOISE TRANSFORMER

摘要

PROBLEM TO BE SOLVED: To provide a grain oriented silicon steel sheet for a low noise transformer effectively reduced in noise by reducing higher harmonics which has louder audibility for human beings. ;SOLUTION: As to this grain oriented silicon steel sheet for a low noise transformer, for all values between 0T to 1.9T in excited magnetic flux density, magnetostriction λ0-B (the difference in the shapes of the steel sheet between the case in which the magnetic flux density is BT and the case in which the magnetic flux density is 0T) lies in the range of 0≤λ0-B≤0.5×10-6. For this purpose, magnetic domain fractionating conditions such as a film tension and a laser are suitably controlled.;COPYRIGHT: (C)2001,JPO