Insulated wire excellent in bending resistance, as well as coil and electric or electronic equipment using the same

Patent metadata

Field	Value
Publication number	US-10483013-B2
Application number	US-201715632026-A
Country	US
Kind code	B2
Filing date	Jun 23, 2017
Priority date	Dec 26, 2014
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

An insulated wire having an insulating coat layer on the conductor outer peripheral surface having a rectangular cross-sectional shape and also having a long side, a short side, and a corner portion with a curvature radius Rc,
wherein a thickness t 1 of the insulating coat layer covered on the surface, and which layer includes a long side, a thickness t 2 of the insulating coat layer covered on the surface, and which layer includes a short side, and a corner portion thickness t 3 of the insulating coat layer satisfy formula (1):

t 3/{( t 1+ t 2)/2}≥1.2  Formula (1)
wherein the t 1 and t 2 are each independently from 20 μm to 50 μm, and wherein a ratio of the conductor cross-sectional area Sc to the insulated wire cross-sectional area Sw satisfies formula (2)

1.0> Sc/Sw ≥0.8;  Formula (2)

as well as a coil and an electric or electronic equipment using the same.

First claim

The invention claimed is:

1. An insulated wire having an insulating coat layer comprising a thermoplastic resin on an outer peripheral surface of a conductor having a rectangular cross-sectional shape and also having a long side, a short side, and a corner portion having a curvature radius Rc,
wherein a thickness t 1 (μm) of the insulating coat layer covered on a surface which is continuing in an axial direction of the conductor, and which layer includes a long side of a transverse section of the conductor, a thickness t 2 (μm) of the insulating coat layer covered on the surface which is continuing in the axial direction of the conductor, and which layer includes a short side of the transverse section of the conductor, and a corner portion thickness t 3 (μm) of the insulating coat layer satisfy formula (1):
t 3/{( t 1+ t 2)/2}≥1.2  Formula (1)

wherein the t 1 (μm) and t 2 (μm) are each independently 20 μm or more and 50 μm or less, and
wherein a ratio of a cross-sectional area Sc (mm 2 ) of the conductor to a cross-sectional area Sw (mm 2 ) of the insulated wire satisfies formula (2):
1.0> Sc/Sw≥ 0.8.  Formula (2)

2. The insulated wire according to claim 1 ,
wherein a long side length c 1 (mm) of the transverse section of the conductor is 4.5 mm or less, a short side length c 2 (mm) of the transverse section of the conductor is 3.5 mm or less, and a curvature radius Re (mm) of the transverse section of the conductor is 0.60 mm or less, and
wherein a combination of t 1 (μm) and c 2 (mm) or a combination of t 2 (μm) and c 1 (mm) each satisfy formula (3a) or (3b):
0< t 1/( c 2×1000)≤0.02.  Formula (3a)

0< t 2/( c 1×1000)≤0.02.  Formula (3b)

3. The insulated wire according to claim 1 , wherein the thermoplastic resin is a crystalline resin and has a bending elastic modulus at 23° C. of 2,000 MPa or more.

4. The insulated wire according to claim 1 , wherein the thermoplastic resin is selected from the group consisting of a polyetheretherketone, a modified polyetheretherketone, a polyetherketoneketone, a polyetherketone, a polyetherketoneetherketoneketone, and a polyphenylene sulfide.

5. A coil, produced by winding working the insulated wire according to claim 1 .

6. An electric or electronic equipment, comprising the coil according to claim 5 .

Assignees

• Furukawa Electric Co Ltd
• Furukawa Magnet Wire Co Ltd

Inventors

• Oya Makoto
• Aoi Tsuneo

Classifications

• H01F5/06

  Insulation of windings · CPC title

• H01B3/30

  plastics; resins; waxes · CPC title

• H02K3/30

  Windings characterised by the insulating material · CPC title

• H01B3/427 Primary

  Polyethers · CPC title

• H01B7/02 Primary

  Disposition of insulation · CPC title