AMORPHOUS SOFT MAGNETIC POWDER, TOROIDAL CORE, AND INDUCTOR

摘要

PROBLEM TO BE SOLVED: To provide an inductor whose loss is lower than that of conventional one and which can be manufactured by low-pressure molding.

SOLUTION: In the three-dimensional shape of an amorphous soft magnetic powder particle used for manufacturing the inductor, the average value of the practical sphericity of Wadell is 0.90 or larger. This results from an effect that a higher average value of the practical sphericity of Wadell allows the suppression of the number of contact between powder particles in using the amorphous soft magnetic powder particles in a powder compacting body such as the inductor, and allows a higher density of filling when in pressure-forming, thereby raising powder compacting density and permeability. Moreover, this results from an effect that the suppression of the number of contacts between powder particles allows the manufacturing of the inductors or the like by low-pressure forming. Moreover, it is preferable to manufacture the amorphous soft magnetic powder particles of this embodiment by a water atomizing method. The reason is that the manufactured amorphous soft magnetic powder particle is easy to be shaped into a true sphere.

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