# US 2019/0173328 A1 · Iron core and motor

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- Number: US 2019/0173328 A1
- Document ID: US20190173328A1
- Status: Published application
- Kind: A1
- Application number: 16/268,439
- Filed: 2019-02-05
- Published: 2019-06-06
- Earliest claimed: 2016-12-07
- Assignees: Panasonic Corporation
- Applicants: Panasonic Corporation
- Inventors: YUKIO NISHIKAWA; NAOKI NOJIRI
- Web page: https://patentgrep.com/patent/US20190173328A1

## CPC

- H02K 1/02: characterised by the magnetic material
- H01F 1/15333: {containing nanocrystallites, e.g. obtained by annealing}
- H01F 3/04: made from strips or ribbons
- H01F 41/0226: {from amorphous ribbons}
- H02K 1/146: {consisting of a generally annular yoke with salient poles}
- H02K 1/185: {to outer stators}
- H02K 15/02: of stator or rotor bodies
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

An iron core including a laminate in which a plurality of nanocrystal thin strips are laminated, a board, and a fastener that fastens the laminate and the board, in which at least one of upper and lower surfaces of the laminate has a colored oxide film and an uncolored oxide film is used. Moreover, the iron core has a region of the colored oxide film wider than a region of the uncolored oxide film region is used. Furthermore, a motor uses the above-described iron core as a stator.

## Claims

### Claim 1

An iron core comprising:
a laminate in which a plurality of nanocrystal thin strips are laminated;
a board; and
a fastener that fastens the laminate and the board,
wherein at least one of upper and lower surfaces of the laminate has a colored oxide film and an uncolored oxide film.

### Claim 2 (depends on 1)

The iron core of claim 1,
wherein a region of the colored oxide film is wider than a region of the uncolored oxide film.

### Claim 3 (depends on 1)

The iron core of claim 1,
wherein, in surfaces between the plurality of nanocrystal thin strips, the uncolored oxide films are present more than the colored oxide films.

### Claim 4 (depends on 1)

The iron core of claim 1,
wherein the plurality of nanocrystal thin strips have mainly a colored oxide film one side and mainly an uncolored oxide film showing metallic luster on an other side.

### Claim 5 (depends on 1)

The iron core of claim 1,
wherein the nanocrystal thin strips of the laminate have mainly an uncolored oxide film showing metallic luster on both sides.

### Claim 6 (depends on 1)

The iron core of claim 1,
wherein the nanocrystal thin strips of the laminate have mainly a colored oxide film on both sides.

### Claim 7 (depends on 1)

The iron core of claim 1, further including:
two or more kinds of a nanocrystal thin strip which has mainly a colored oxide film on both sides, a nanocrystal thin strip which has mainly an uncolored oxide film showing metallic luster on both sides, and a nanocrystal thin strip which has mainly a colored oxide film on one side and mainly an uncolored oxide film showing metallic luster on an other side.

### Claim 8 (depends on 1)

The iron core of claim 1,
wherein a metal plate is provided between the laminate and the board or between the laminate and the fastener.

### Claim 9 (depends on 1)

The iron core of claim 1,
wherein the laminate includes a plurality of laminates.

### Claim 10 (depends on 9)

The iron core of claim 9,
wherein the plurality of laminates have a different number of the nanocrystal thin strips.

### Claim 11 (depends on 9)

The iron core of claim 9,
wherein the plurality of laminates include one piece of the nanocrystal thin strips.

### Claim 12 (depends on 1)

The iron core of claim 1,
wherein the laminate is integrated by a fixing means.

### Claim 13 (depends on 12)

The iron core of claim 12, wherein the fixing means is an adhesive.

### Claim 14 (depends on 13)

The iron core of claim 13,
wherein the adhesive is applied to a laminated end surface of the laminate.

### Claim 15 (depends on 13)

The iron core of claim 13,
wherein the adhesive undergoes thermal history.

### Claim 16 (depends on 12)

The iron core of claim 12,
wherein the fixing means is a mechanical fastening mechanism.

### Claim 17 (depends on 1)

The iron core of claim 1,
wherein a metal plate is provided on the laminate or at least one of uppermost and lowermost outer layers of the nanocrystal thin strips.

### Claim 18 (depends on 1)

A motor which uses the iron core of claim 1 as a stator.