Hitachi Chemical Company, Ltd.

Hiroaki Kondo

Chio Ishihara

Takashi Inagaki

The powder magnetic core of the present invention can exhibit reliable superposition property in which variance rate of inductance value is small even if superposed current is varied, and can reduce the number of cores used in a reactor. The powder magnetic core comprises: soft magnetic powder particles, and gaps between the soft magnetic powder particles, in which the powder magnetic core has a density ratio of 90 to 95%, and when observing a cross section thereof, layered gaps having thicknesses of 1 to 3 &#x3bc;m and widths of 20 to 200 &#x3bc;m are formed inside of the powder magnetic core. It is desirable that the layered gaps be not less than 50% of all the gaps in a cross sectional area ratio.

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Matsudo, Japan

Hiroaki Kondo