REACTOR AND METHOD FOR PRODUCING SAME

WIPO Patent Application WO/2011/158632

A1

Disclosed is a reactor (1α) comprised of one coil (2), a magnetic core (3) on which the coil (2) is disposed, and a case (4) containing an assembly (10) of the coil (2) and the magnetic core (3). The magnetic core (3) has an inner core portion (31) inserted into the coil (2), and a coupling core portion (32) disposed on the outer periphery of the coil (2). The coupling core portion (32) is composed of a mixture of magnetic powder and resin. The coil (2) is covered by the coupling core portion (32), and is hermetically enclosed in the case (4). The uppermost area of the reactor (1α), exposed from the opening of the case (4), is provided with a magnetic shield layer (5) composed of conductive non-magnetic powder having specific gravity smaller than that of the magnetic powder, and the resin, so that a leakage flux to the outside can be reduced, and a small reactor can be provided. The reactor (1α) is produced by filling the case (4) with a mixture of magnetic powder, non-magnetic powder, and resin, wherein the non-magnetic powder floats on the opening side of the case (4), and the magnetic powder settles out on the bottom side of the case (4), before hardening the resin. Thus, a leakage flux to the outside can be reduced, and a method for producing a small reactor can be provided.

INABA, Kazuhiro (1-3, Shimaya 1-chome, Konohana-ku, Osaka-sh, Osaka 24, 〒5540024, JP)

JP2011/062198

December 22, 2011

May 27, 2011

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SUMITOMO ELECTRIC INDUSTRIES,LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友電気工業株式会社 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 Osaka, 〒5410041, JP)

H01F37/00; H01F27/24; H01F27/255; H01F27/36; H01F41/04

NAKATA, Motomi et al. (1-3, Shimaya 1-chome, Konohana-ku, Osaka-sh, Osaka 24, 〒5540024, JP)

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