Wound magnetic core
AssigneeProterial, Ltd.
InventorTsugitomo Nakada
Life of this patent
Estimating the term…
Abstract
A nonmagnetic insulating metal oxide powder is made to adhere to a surface of a soft magnetic metal ribbon having an amorphous structure; this is wound in annular fashion and made into a wound body at which the metal oxide powder intervenes between ribbon layers; the wound body is made to undergo heat treatment in a nonoxidizing atmosphere; the wound body is thereafter subjected to treatment for formation of an oxide film in an oxidizing atmosphere adjusted to be at a temperature lower than that at the heat treatment to cause oxidation of the surface of the soft magnetic metal ribbon; and spaces between ribbon layers at the wound body are moreover impregnated with resin and curing is carried out to fuse the metal oxide powder thereto.
Claims5
A wound magnetic core in which a soft magnetic metal ribbon is wound, the wound magnetic core being such that:
- the soft magnetic metal ribbon has an amorphous structure and/or a nanocrystalline structure;
- a layer of an oxide of Fe derived from a metal making up the soft magnetic metal ribbon is present at a surface of the soft magnetic metal ribbon;
- spaces between layers of the soft magnetic metal ribbon have a nonmagnetic insulating metal oxide powder in intervening fashion and are impregnated with a resin;
- and
- a space factor of the wound magnetic core is not less than 65% but not greater than 75%.
Dependencies are inferred from the claim text.