Method of removing coating layer of coil wiring

Patent metadata

Field	Value
Publication number	US-11387718-B2
Application number	US-201916580391-A
Country	US
Kind code	B2
Filing date	Sep 24, 2019
Priority date	Sep 27, 2018
Publication date	Jul 12, 2022
Grant date	Jul 12, 2022

Abstract

A method of removing an insulating coating layer of coil wiring includes: a fragmentation step in which a line-shaped region of the insulating coating layer, which separates a removal-planned portion and a remain-planned portion of the insulating coating layer, is removed; a laser irradiation step in which laser light which transmits through the insulating coating layer but which is absorbed by a coil wiring is irradiated from a side of an outer surface of the removal-planned portion toward a boundary of the coil wiring with the insulating coating layer, to carbonize a boundary portion between the insulating coating layer and the coil wiring of the removal-planned portion by generation of heat of the coil wiring; and a coating turn-over step in which air is blown onto the removal-planned portion to turn over and blow off the removal-planned portion.

First claim

The invention claimed is:

1. A method of removing an insulating coating layer which is in close contact with a coil wiring, comprising:
a fragmentation step of removing a line-shaped region of the insulating coating layer, the line-shaped region separates a removal-planned portion and a remain-planned portion of the insulating coating layer;
a laser irradiation step of irradiating laser light which transmits through the insulating coating layer but which is absorbed by the coil wiring, from a side of an outer surface of the removal-planned portion toward a boundary of the coil wiring with the insulating coating layer, to carbonize a boundary portion between the insulating coating layer and the coil wiring of the removal-planned portion by generation of heat of the coil wiring; and
a coating turn-over step of blowing air onto the removal-planned portion to turn over and blow off the removal-planned portion.

2. The method of removing the coating layer of the coil wiring according to claim 1 , wherein
in the fragmentation step, the line-shaped region of the insulating coating layer is removed by laser light irradiation, and
a scanning velocity of the laser light used in the laser irradiation step is set higher than a scanning velocity of the laser light used in the fragmentation step.

3. The method of removing the coating layer of the coil wiring according to claim 2 , wherein
a spacing of parallel lines of a movement trajectory of the laser light in the laser irradiation step is set larger than a spacing of parallel lines of a movement trajectory of the laser light in the fragmentation step.

4. The method of removing the coating layer of the coil wiring according to claim 1 , wherein
in the fragmentation step, the line-shaped region of the insulating coating layer is removed by laser light irradiation, and
a spacing of parallel lines of a movement trajectory of the laser light in the laser irradiation step is set larger than a spacing of parallel lines of a movement trajectory of the laser light in the fragmentation step.

5. The method of removing the coating layer of the coil wiring according to claim 1 , wherein
the laser irradiation step and the blowing of air onto the removal-planned portion in the coating turn-over step are executed simultaneously.

6. The method of removing the coating layer of the coil wiring according to claim 1 , wherein
in the fragmentation step, the line-shaped region of the insulating coating layer is removed by a short-wavelength laser irradiating laser light, which has a shorter wavelength than a fundamental-wavelength laser used in the laser irradiation step and which is absorbed by the line-shaped region.

Assignees

• Toyota Motor Co Ltd
• Denso Corp

Inventors

• Shirai Ken
• Hirao Yasuyuki
• Matsumoto Masashi
• Takeda Hiroaki
• Maruyama Ryosuke

Classifications

• H01F41/10

  Connecting leads to windings (making electric connections in general H01R43/00) · CPC title

• H02K15/50 Primary

  Disassembling, repairing or modifying dynamo-electric machines (repairing of cooling fluid boxes H02K15/38) · CPC title

• H02K15/33

  Connecting winding sections; Forming leads; Connecting leads to terminals · CPC title

• H01F41/12 Primary

  Insulating of windings ({impregnating or encapsulating of transformers H01F41/005} ; of conductors in general H01B13/06) · CPC title

• H01F41/122

  Insulating between turns or between winding layers · CPC title