High-frequency wire and high-frequency coil

Patent metadata

Field	Value
Publication number	US-10026526-B2
Application number	US-201415024302-A
Country	US
Kind code	B2
Filing date	Sep 22, 2014
Priority date	Sep 25, 2013
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A high-frequency wire includes: a central conductor that is formed from aluminum or an aluminum alloy; and a magnetic layer that has a fibrous structure formed along a longitudinal direction of the central conductor and covers the central conductor.

First claim

The invention claimed is:

1. A high-frequency wire, comprising:
a central conductor that is formed from aluminum or an aluminum alloy; and
a soft magnetic layer that has a fibrous structure including a crystal grain and formed along a longitudinal direction of the central conductor and covers the central conductor, the soft magnetic layer being formed from iron or an iron alloy.

2. The high-frequency wire according to claim 1 ,
wherein the soft magnetic layer includes an insulation coating layer on an outer surface side.

3. A litz wire, comprising:
a plurality of the twisted high-frequency wires according to claim 1 .

4. A high-frequency coil, comprising:
the high-frequency wire according to claim 1 .

5. A method of manufacturing the high-frequency wire according to claim 1 , comprising
drawing a wire base material including a central conductor which is formed from aluminum or an aluminum alloy and a soft magnetic layer which covers the central conductor by using one or a plurality of dies, thereby obtaining the high-frequency wire in which the soft magnetic layer has a fibrous structure, the soft magnetic layer being formed from iron or an iron alloy.

6. The method of manufacturing a high-frequency wire according to claim 5 ,
wherein a cumulative reduction rate of area when the wire base material is subjected to wire drawing is equal to or greater than 70%.

7. The method of manufacturing a high-frequency wire according to claim 5 ,
wherein the wire base material is obtained by inserting the central conductor through a tubular soft magnetic layer body made of the soft magnetic layer.

8. The method of manufacturing a high-frequency wire according to claim 5 ,
wherein the fibrous structure is formed by drawing the wire base material at a temperature lower than the recrystallization temperature of the soft magnetic layer.

9. The high-frequency wire according to claim 1 ,
wherein the crystal grain has an aspect ratio greater than 5:1.

10. The high-frequency wire according to claim 1 ,
wherein a cross-sectional area of the soft magnetic layer is equal to or less than 20% with respect to that of the entire high-frequency wire.

11. The high-frequency wire according to claim 1 ,
wherein the fibrous structure is formed also in the central conductor along a longitudinal direction of the central conductor.

Assignees

• Fujikura Ltd

Inventors

• Mieno Satoshi
• Kamidaki Chihiro
• Hori Yasunobu

Classifications

• H01B1/023

  Alloys based on aluminium · CPC title

• H01B3/008

  Other insulating material · CPC title

• H01B7/30 Primary

  with arrangements for reducing conductor losses when carrying alternating current, e.g. due to skin effect · CPC title

• H01F27/2823

  Wires (H01F27/2866 takes precedence) · CPC title

• H01B7/0009

  Details relating to the conductive cores · CPC title