# US 12,119,157 B2 · Wound core

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- Number: US 12,119,157 B2
- Document ID: US12119157B2
- Status: Granted
- Kind: B2
- Application number: 18/684,573
- Filed: 2022-10-04
- Published: 2024-08-08
- Granted: 2024-10-15
- Earliest claimed: 2021-10-04
- Assignees: Nippon Steel Corporation
- Applicants: Nippon Steel Corporation
- Inventors: Takahito Mizumura; Hisashi Mogi; Masaru Takahashi
- Web page: https://patentgrep.com/patent/US12119157B2

## CPC

- H01F 27/2455: {using deformed sheets, e.g. bent laminations}
- H01F 3/02: made from sheets
- H01F 27/245: made from sheets, e.g. grain-oriented (H01F27/26 takes precedence)
- H01F 41/024: {Manufacturing of magnetic circuits made from deformed sheets (magnetic cores made from deformed sheets H01F27/2455)}
- H01F 1/14775: {in the form of sheets}
- H01F 41/0233: {Manufacturing of magnetic circuits made from sheets (magnetic cores made from sheets H01F27/245; soft magnetic alloys in the form of sheets H01F1/16)}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

The wound core of the present invention has at least one arbitrary bent region 5A, in a plurality of corner portions (3), in which the corner portion (3) bulges outward to confine the magnetic flux flowing in the wound core so that the angle θ formed by the straight line PQ and the straight line PR satisfies 23°≤θ≤50°.

## Claims

### Claim 1

A wound core comprising:
a hollow portion in a center; and
a portion in which grain-oriented electrical steel sheets are stacked in a sheet thickness direction, the grain-oriented electrical steel sheets each having flat portions and bent portions continuing alternately in a longitudinal direction,
the wound core formed into a rectangular shape having four corner portions including the bent portions, by stacking the grain-oriented electrical steel sheets, each obtained by folding, in layers and assembling the grain-oriented electrical steel sheets into a wound state in which a plurality of the grain-oriented electrical steel sheets are connected to each other via at least one joint portion for each winding and a total of bending angles of the bent portions in each of the four corner portions is 90 degrees, wherein
corresponding bent portions of the grain-oriented electrical steel sheets are stacked in layers in the sheet thickness direction to form one bent region,
in a side view of the wound core, in at least one arbitrary bent region in the four corner portions, when P represents, in an innermost grain-oriented electrical steel sheet in a plurality of the grain-oriented electrical steel sheets stacked in layers, an intersection point of an extending line extending along an inner surface of a flat portion to a corner portion and an extending line extending along an inner surface of a flat portion between bent portions forming the corner portion, Q represents, in an outermost grain-oriented electrical steel sheet in a plurality of the grain-oriented electrical steel sheets stacked in layers, an intersection point of an extending line extending along an outer surface of a flat portion to the corner portion and an extending line extending along an outer surface of a flat portion between bent portions forming the corner portion, and R represents a point where a straight line, the straight line passing through the intersection point represented by P and extending in a direction perpendicular to an extending direction of each of the plurality of the grain-oriented electrical steel sheets to the corner portion, intersects the outer surface of the outermost grain-oriented electrical steel sheet, an angle θ formed by a straight line PQ and a straight line PR satisfies 23°≤θ≤50°.

### Claim 2 (depends on 1)

The wound core according to claim 1, wherein two grain-oriented electrical steel sheets adjacent to each other in a thickness direction of the wound core are different in length of a flat portion between bent portions forming an identical corner portion.

### Claim 3 (depends on 2)

The wound core according to claim 2, wherein when ΔLm represents a difference between a length of a grain-oriented electrical steel sheet a number represented by m of sheets away from the innermost grain-oriented electrical steel sheet and a length of a grain-oriented electrical steel sheet a number represented by (m+1) of sheets away from the innermost grain-oriented electrical steel sheet, and <ΔL> represents an average of values of ΔLm for all numbers represented by m, <ΔL> satisfies Formula (1) described below:
<ΔL>=10×t×{(πθ/180)3+(πθ/180)} (1)
wherein t represents a thickness of each grain-oriented electrical steel sheet.