MAGNETIC CORE Russian patent published in 2002 - IPC

FIELD: electrical engineering; miscellaneous transformers and reactors. SUBSTANCE: magnetic core relates to those made of magnetically soft alloys characterized in high sensitivity of their magnetic properties to heat treatment in magnetic field. Proposed magnetic core is spiral core made of magnetically soft amorphous alloy strip containing cobalt, iron, manganese, silicon, and boron in its composition. Novelty is that proportion of alloy ingredients is as follows, atom percent: iron 1.65-5; total content of iron and manganese 4-8; silicon 2-8; total content of silicon and boron 16-24; cobalt the rest. B_r/B₈₀₀ ratio in magnetic core is higher than 0.9 or this ratio is lower than 0.05, where B_r is residual flux density; (B₈₀₀ is flux density at magnetic field intensity of 800 A/m. Squareness ratio of magnetic hysteresis loop K_l > 0.9 upon heat treatment and K_l <0.05 upon baking. EFFECT: improved squareness ratio of magnetic core. 2 cl, 1 dwg, 2 tbl, 1 ex