# US 2015/0027748 A1 · Inverter surge-resistant insulated wire and method of producing the same

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- Number: US 2015/0027748 A1
- Document ID: US20150027748A1
- Status: Published application
- Kind: A1
- Application number: 14/507,226
- Filed: 2014-10-06
- Published: 2015-01-29
- Earliest claimed: 2012-11-30
- Assignees: Furukawa Electric Co., Ltd.; Furukawa Magnet Wire Co., Ltd.
- Applicants: Furukawa Electric Co., Ltd.; Furukawa Magnet Wire Co., Ltd.
- Inventors: Hideo FUKUDA; Daisuke MUTO; Dai FUJIWARA; Keiichi TOMIZAWA; Tsuneo AOI
- Web page: https://patentgrep.com/patent/US20150027748A1

## CPC

- H01B 13/148: {Selection of the insulating material therefor}
- H01B 3/301: {Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen or carbon in the main chain of the macromolecule, not provided for in group H01B3/302}
- H01B 3/305: {Polyamides or polyesteramides}
- H01B 3/306: {Polyimides or polyesterimides}
- H01B 3/427: {Polyethers}
- H01B 7/0225: {Three or more layers}
- H01B 7/0283: {comprising in addition one or more other layers of non-extruded insulation}
- H01B 13/065: {Insulating conductors with lacquers or enamels}
- H01B 13/14: by extrusion {(extrusion in general B29C48/00)}
- 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})

## Abstract

An inverter surge-resistant insulated wire, having at least one baked enamel layer around the outer periphery of a conductor having a rectangular cross-section, at least one extrusion-coated resin layer around the outer side thereof, and an adhesive layer having a thickness of 2 to 20 μm between the baked enamel layer and the extrusion-coated resin layer, wherein each of the at least one extrusion-coated resin layer on the adhesive layer is formed by the same resin, a cross-sectional shape of the baked enamel layer and the extrusion-coated resin layer in the cross-section of the inverter surge-resistant insulated wire is rectangular, and in the cross-sectional shape formed by the baked enamel layer and the extrusion-coated resin layer surrounding the conductor in a cross-sectional view, at least a pair of two sides of two pairs of two sides opposing at the upper side and the downside or at the right side and the left side with respect to the conductor each meet the conditions that a total thickness of the baked enamel layer and the extrusion-coated resin layer is 80 μm or more, a thickness of the baked enamel layer is 60 μm or less, a thickness of the extrusion-coated resin layer is 200 μm or less, and the resin of the extrusion-coated resin layer has a melting point of 300° C. or more and 370° C. or less, and a method of producing the inverter surge-resistant insulated wire comprising forming adhesive layer on the outer periphery of the baked enamel layer, and then extruding a thermoplastic resin for forming the extrusion-coated resin layer on the adhesive layer thereby to contact with the adhesive layer, the thermoplastic resin becoming a molten state at a higher temperature than a glass transition temperature of the resin that is used for the adhesive layer.

## Claims

### Claim 1

An inverter surge-resistant insulated wire, having at least one baked enamel layer around the outer periphery of a conductor having a rectangular cross-section, at least one extrusion-coated resin layer around the outer side thereof, and an adhesive layer having a thickness of 2 to 20 μm between the baked enamel layer and the extrusion-coated resin layer,
wherein each of the at least one extrusion-coated resin layer on the adhesive layer is formed by the same resin,
a cross-sectional shape of the baked enamel layer and the extrusion-coated resin layer in the cross-section of the inverter surge-resistant insulated wire is rectangular, and in the cross-sectional shape formed by the baked enamel layer and the extrusion-coated resin layer surrounding the conductor in a cross-sectional view, at least a pair of two sides of two pairs of two sides opposing at the upper side and the downside or at the right side and the left side with respect to the conductor each meet the conditions that a total thickness of the baked enamel layer and the extrusion-coated resin layer is 80 μm or more, a thickness of the baked enamel layer is 60 μm or less, a thickness of the extrusion-coated resin layer is 200 μm or less, and
the resin of the extrusion-coated resin layer has a melting point of 300° C. or more and 370° C. or less.

### Claim 2 (depends on 1)

The inverter surge-resistant insulated wire according to claim 1, wherein the extrusion-coated resin layer is composed of a single layer.

### Claim 3 (depends on 1)

The inverter surge-resistant insulated wire according to claim 1, wherein a dielectric breakdown voltage after a 300° C. 168 hour heat treatment of the inverter surge-resistant insulated wire is 90% or more of the dielectric breakdown voltage before the heat treatment.

### Claim 4 (depends on 1)

The inverter surge-resistant insulated wire according to claim 1, wherein adhesive strength among coated layers of the inverter surge-resistant insulated wire is 100 g or more and less than 400 g.

### Claim 5 (depends on 1)

The inverter surge-resistant insulated wire according to claim 1, wherein the extrusion-coated resin layer is a layer formed by at least one thermoplastic resin selected from the group consisting of polyether ether ketone, modified-polyether ether ketone, thermoplastic polyimide, and aromatic polyamide.

### Claim 6 (depends on 1)

The inverter surge-resistant insulated wire according to claim 1, wherein the adhesive layer is a layer formed by at least one thermoplastic resin selected from the group consisting of polyetherimide, polyphenylsulfone, and polyethersulfone.

### Claim 7 (depends on 1)

The inverter surge-resistant insulated wire according to claim 1, wherein a peak voltage of the partial discharge inception voltage of the inverter surge-resistant insulated wire is 1200 Vp or more and 3200 Vp or less.

### Claim 8 (depends on 1)

A method of producing the inverter surge-resistant insulated wire according to claim 1 comprising:
baking a varnish-made resin on the outer periphery of the baked enamel layer to form the adhesive layer; and then
extruding a thermoplastic resin for forming the extrusion-coated resin layer on the adhesive layer thereby to contact with the adhesive layer, the thermoplastic resin becoming a molten state at a higher temperature than a glass transition temperature of the resin that is used for the adhesive layer and heat-sealing the extrusion-coated resin on the baked enamel layer via the adhesive layer thereby to form the extrusion-coated resin layer.