# US 2014/0191839 A1 · Compact

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- Number: US 2014/0191839 A1
- Document ID: US20140191839A1
- Status: Published application
- Kind: A1
- Application number: 14/234,611
- Filed: 2011-11-28
- Published: 2014-07-10
- Earliest claimed: 2011-07-27
- Assignees: Sumitomo Electric Sintered Alloy, Ltd.; Sumitomo Electric Industries, Ltd.
- Inventors: Atsushi Sato; Masato Uozumi; Koji Yamaguchi; Kazushi Kusawake
- Web page: https://patentgrep.com/patent/US20140191839A1

## CPC

- H01F 27/255: made from particles (H01F27/26 takes precedence)
- H01F 1/24: the particles being insulated
- H01F 3/08: made from powder (powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06)
- H01F 37/00: Fixed inductances not covered by group H01F17/00
- H01F 41/0246: {Manufacturing of magnetic circuits by moulding or by pressing powder (magnetic cores made by moulding or by pressing powder H01F27/255; soft magnetic particles H01F1/20, H01F1/36)}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A compact 10 is obtained by compression-molding coated soft magnetic particles covered with insulating coatings, and is a modified frustum body having, as a main body, a frustum portion 113 sandwiched between plate-shaped portions 111 and 112 arranged in opposing relation. A vertical cross-section of the compact 10 is made up of a trapezoidal surface 113s, a long-side rectangular surface 111s joining to a long side of the trapezoidal surface 113s, and a short-side rectangular surface 112s joining to a short side of the trapezoidal surface 113s.

## Claims

### Claim 1

A compact obtained by compression-molding coated soft magnetic particles covered with insulating coatings,
wherein the compact has, as at least a part of a cross-section thereof, a surface comprising:
a trapezoidal surface having a long side and a short side opposing to each other;
a long-side rectangular surface joining to the long side of the trapezoidal surface; and
a short-side rectangular surface joining to the short side of the trapezoidal surface, and
wherein an area of the trapezoidal surface is larger than a total area of the long-side rectangular surface and the short-side rectangular surface.

### Claim 2 (depends on 1)

The compact according to claim 1, wherein, assuming that a boundary surface between the trapezoidal surface and the long-side rectangular surface is a first surface and a boundary surface between the trapezoidal surface and the short-side rectangular surface is a second surface, the compact is molded such that a direction perpendicular to at least one of the first surface and the second surface is a pressing direction.

### Claim 3 (depends on 2)

The compact according to claim 2, wherein a surface parallel to the first surface and a surface parallel to the second surface are both press-molded surfaces.

### Claim 4 (depends on 1)

The compact according to claim 1, wherein, assuming that a boundary surface between the trapezoidal surface and the long-side rectangular surface is a first surface and a boundary surface between the trapezoidal surface and the short-side rectangular surface is a second surface, a ratio of an area of the second surface to an area of the first surface is 80% or more and 99.8% or less.

### Claim 5 (depends on 1)

The compact according to claim 1, wherein a portion having the trapezoidal surface is employed at a location at which a tubular coil is arranged, and
a surface constituting an oblique side of the trapezoidal surface is arranged to face an inner peripheral surface of the coil.

### Claim 6 (depends on 1)

A reactor core including the compact according to any one of claim 1.

### Claim 7 (depends on 1)

A magnetic circuit component including a magnetic core and a tubular coil arranged in a part of the magnetic core,
wherein the magnetic core includes an inner core portion arranged in the coil, and an exposed core portion exposed from the coil and forming a closed magnetic path in cooperation with the inner core portion, and
the inner core portion includes the compact according to claim 1.

### Claim 8 (depends on 7)

The magnetic circuit component according to claim 7, wherein the magnetic circuit component is a reactor.