Insulated wire, coil and method for manufacturing the coil

Patent metadata

Field	Value
Publication number	US-11094434-B2
Application number	US-201816144191-A
Country	US
Kind code	B2
Filing date	Sep 27, 2018
Priority date	Mar 2, 2018
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

An insulated wire includes a conductor including a copper material, and an insulation layer that is formed on an outer periphery of the conductor. A restoring temperature TB of the conductor is not more than 130° C. The restoring temperature TB is a temperature that is needed to restore a conductivity of the conductor after a coil processing to a conductivity of the conductor before the coil processing.

First claim

The invention claimed is:

1. An insulated wire, comprising:
a conductor comprising a copper material comprising a chemical composition comprising a titanium concentration of not less than 24 mass ppm and not more than 30 mass ppm, a sulfur concentration of not less than 3 mass ppm and not more than 5 mass ppm, an oxygen concentration of not less than 10 mass ppm and not more than 13 mass ppm, and a balance being copper and inevitable impurities and subjected to a hot rolling time of at least about 10 seconds at a hot rolling temperature by a final mill roll of not less than 500° C. and not more than 550° C.; and
an insulation layer formed on an outer periphery of the conductor,
wherein a restoring temperature T B of the conductor is not less than 75° C. and not more than 124° C., and
wherein the restoring temperature T B is a temperature that is needed to restore a conductivity of the conductor after a coil processing to a conductivity of the conductor before coil processing.

2. The insulated wire according to claim 1 , wherein the restoring temperature T B is lower than a semi-softening temperature T A of the conductor.

3. The insulated wire according to claim 2 , wherein the semi-softening temperature T A of the conductor is not less than 125° C. and not more than 138° C.

4. The insulated wire according to claim 1 ,
wherein a ratio of the titanium concentration to the oxygen concentration is not less than 2.0 and not more than 4.0.

5. The insulated wire according to claim 1 , wherein the insulation layer comprises a thermosetting resin comprising at least one of a polyimide resin, a polyamide-imide resin and a polyester-imide resin.

6. The insulated wire according to claim 2 ,
wherein a ratio of the titanium concentration to the oxygen concentration is not less than 2.0 and not more than 4.0.

7. The insulated wire according to claim 3 ,
wherein a ratio of the titanium concentration to the oxygen concentration is not less than 2.0 and not more than 4.0.

8. The insulated wire according to claim 2 , wherein the insulation layer comprises a thermosetting resin comprising at least one of a polyimide resin, a polyamide-imide resin and a polyester-imide resin.

9. The insulated wire according to claim 3 , wherein the insulation layer comprises a thermosetting resin comprising at least one of a polyimide resin, a polyamide-imide resin and a polyester-imide resin.

10. The insulated wire according to claim 1 , wherein the restoring temperature T B of the conductor is not less than 88° C. and not more than 120° C.

11. The insulated wire according to claim 1 , wherein the restoring temperature T B is defined as the temperature necessary for restoring the conductivity of the conductor of the wire to within 0.5% IACS before the wire is subjected to a 30% elongation processing and heated for one hour.

Assignees

• Hitachi Metals Ltd

Inventors

• Kuroda Hiromitsu
• Hata Shohei
• Tsuji Takayuki
• Fujito Keisuke

Classifications

• H01B13/145 Primary

  Pretreatment or after-treatment · CPC title

• H01B1/026 Primary

  Alloys based on copper · CPC title

• H01F5/06

  Insulation of windings · CPC title

• H01B1/10

  sulfides · CPC title

• H01B3/306

  Polyimides or polyesterimides · CPC title