Magnetostriction of 6.5% Si Steel Sheets

Technology for the world´s first production of 6.5% Si steel sheets in a coil form has been commercially developed. The dc and ac magnetostriction in 6.5% Si steel sheets and the noise in transformers employing such sheets were investigated, comparing the results with figures for conventional 3% Si steel sheets. 6.5% Si steel sheets had extremely small magnetostriction, and were found to be suitable for application in low-noise audio-frequency transformers.