Insulated wire, motor coil, electric/electronic equipment and method of producing insulated wire

Patent metadata

Field	Value
Publication number	US-2016307668-A1
Application number	US-201615192162-A
Country	US
Kind code	A1
Filing date	Jun 24, 2016
Priority date	Dec 26, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

An insulated wire containing: at least one thermosetting resin layer; and at least one thermoplastic resin layer, provided in this order on a conductor having a rectangular cross-section, a curvature radius r of corner portions at both edges of at least one short side of the conductor being 0.6 mm or less, in which thickness t 1 of the corner portion of the thermosetting resin layer and thickness t 2 of the corner portion of the thermoplastic resin layer satisfy a relation expressed by the following Formula 1:
t 2/ t 1<1;  Formula 1:

and a method of producing thereof, a motor coil, and an electric/electronic equipment.

First claim

1 . An insulated wire comprising:
at least one thermosetting resin layer; and at least one thermoplastic resin layer, provided in this order on a conductor having a rectangular cross-section, a curvature radius r of corner portions at both edges of at least one short side of the conductor being 0.6 mm or less, wherein thickness t 1 of the corner portion of the thermosetting resin layer and thickness t 2 of the corner portion of the thermoplastic resin layer satisfy a relation expressed by the following Formula 1:
t 2/ t 1<1.  Formula 1:

2 . The insulated wire according to claim 1 , wherein the curvature radius r of the corner portion is 0.4 mm or less and t 1 and t 2 satisfy a relation expressed by the following Formula 2:
t 2/ t 1≦0.7.  Formula 2:

3 . The insulated wire according to claim 1 , wherein t 1 is 50 μm or more.

4 . The insulated wire according to claim 1 , wherein a tensile modulus at 25° C. of the thermosetting resin layer is larger than a tensile modulus at 25° C. of the thermoplastic resin layer.

5 . The insulated wire according to claim 1 , wherein a difference between the tensile modulus at 25° C. of the thermosetting resin layer and the tensile modulus at 25° C. of the thermoplastic resin layer is 250 MPa or more and the tensile modulus at 25° C. of the thermoplastic resin layer is more than 2,500 MPa.

6 . The insulated wire according to claim 1 , wherein at least one resin constituting the thermoplastic resin layer is a thermoplastic resin selected from the group consisting of a polyether ether ketone, a modified polyether ether ketone, a thermoplastic polyimide, and an aromatic polyimide.

7 . The insulated wire according to claim 1 , having an interlayer comprising a non-crystalline thermoplastic resin between the thermoplastic resin layer and the thermosetting resin layer.

8 . A motor coil comprising the insulated wire according to claim 1 which has been subjected to a wind-processing.

9 . An electric/electronic equipment produced by processing the insulated wire according to claim 1 by winding.

10 . A method of producing an insulated wire comprising at least one thermosetting resin layer and at least one thermoplastic resin layer, provided in this order on a conductor having a rectangular cross-section, a curvature radius r of corner portions at both edges of at least one short side of the conductor being 0.6 mm or less, comprising a step of:
baking the thermosetting resin layer; and extrusion-molding the thermoplastic resin layer, thereby to make thickness t 1 of a corner portion of the thermosetting resin layer and thickness t 2 of a corner portion of the thermoplastic resin layer satisfy a relation expressed by the following Formula 1:
t 2/ t 1<1.  Formula 1:

Assignees

• Furukawa Electric Co Ltd
• Furukawa Magnet Wire Co Ltd

Inventors

• Oya Makoto
• Aoi Tsuneo

Classifications

• H01F5/06 Primary

  Insulation of windings · CPC title

• H01B13/141

  of two or more insulating layers · CPC title

• H02K3/30

  Windings characterised by the insulating material · CPC title

• H01B7/0225 Primary

  Three or more layers · CPC title

• H01F27/2823

  Wires (H01F27/2866 takes precedence) · CPC title