# US 2025/0149202 A1 · Magnet wire

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- Number: US 2025/0149202 A1
- Document ID: US20250149202A1
- Status: Published application
- Kind: A1
- Application number: 18/833,887
- Filed: 2022-10-17
- Published: 2025-05-08
- Earliest claimed: 2022-02-01
- Assignees: Sumitomo Electric Industries, Ltd.
- Applicants: Sumitomo Electric Industries, Ltd.
- Inventors: Shinichi IIZUKA; Soichiro OKUMURA; Shinichi KANAZAWA; Yusuke SAKAMOTO; Shinnosuke NAKAJIMA; Naoki SUGIHARA; Kazuaki IKEDA; Makoto NAKABAYASHI
- Web page: https://patentgrep.com/patent/US20250149202A1

## CPC

- H01B 7/0225: {Three or more layers}
- H01B 3/306: {Polyimides or polyesterimides}
- H01B 3/427: {Polyethers}
- H01B 3/445: {from vinylfluorides or other fluoroethylenic compounds}
- H01B 7/02: Disposition of insulation
- H01B 7/0216: {Two layers}
- H02K 3/30: Windings characterised by the insulating material
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A magnet wire according to an aspect of the present disclosure is a magnet wire comprising a conductor and a plurality of insulating layers covering the conductor, wherein the insulating layers have an innermost layer and an outermost layer, a main component of the innermost layer is a fluororesin, and a ratio E1/E2 of a Young's modulus E1 of the outermost layer to a Young's modulus E2 of the innermost layer is 1.1 or more.

## Claims

### Claim 1

A magnet wire comprising:
a conductor; and
a plurality of insulating layers covering the conductor, wherein
the insulating layers have an innermost layer and an outermost layer,
a main component of the innermost layer is a fluororesin, and
a ratio E1/E2 of a Young's modulus E1 of the outermost layer to a Young's modulus E2 of the innermost layer is 1.1 or more.

### Claim 2 (depends on 1)

The magnet wire according to claim 1, wherein a ratio ε1/ε of a relative permittivity ε1 of the outermost layer to a relative permittivity ε of the insulating layers as a whole is from 1.1 to 2.0.

### Claim 3 (depends on 1)

The magnet wire according to claim 1, wherein a main component of the outermost layer is polyimide, polyamide-imide, polyether ether ketone, polyphenylene sulfide, or a combination of these.

### Claim 4 (depends on 1)

The magnet wire according to claim 1, wherein at least one of the innermost layer and the outermost layer contains silica.

### Claim 5 (depends on 1)

The magnet wire according to claim 1, wherein the insulating layers further have an intermediate layer between the outermost layer and the innermost layer.

### Claim 6 (depends on 5)

The magnet wire according to claim 5, wherein the intermediate layer contains silica.

### Claim 7 (depends on 1)

The magnet wire according to claim 1, wherein the magnet wire is a rectangular wire.