| 摘要 |
PURPOSE:To obtain the title magnetic core having excellent DC-superimposed characteristics at low magnetic core loss by making use of ultra-fine crystalline alloy having crystalline particles in specific particle diameter and residual flux density. CONSTITUTION:Within the title choke coil, transformer, an ultra-fine crystalline alloy wherein at least 50% of the structure thereof is held by crystalline particles in particle diameter not exceeding 500Angstrom as well as residual flux density not exceeding 7000G and the density at 10Oe not exceeding 7000G is used as the title magnetic core. This magnetic core displays the characteristics thereof fit for a transformer or normal mode choke when the residual flux density and the flux density at 10Oe does not exceed 7000G. Besides, it recommended that the mean particle diameter does not exceed 300Angstrom . It is also required that the ratio of crystalline particles exceeds 50% of the structure and if it does not exceed 50%, the magnetostriction is intensified to start humming in audio-frequency. Through these procedures, the title ultra-fine crystalline alloy having excellent DC-superimposed characteristics at low magnetic core loss can be obtained thereby enabling the effect on a choke coil and transformer using the same to be notably enhanced. |
