Litz wire

• US 4,546,210 A
• Filed: 06/03/1983
• Issued: 10/08/1985
• Est. Priority Date: 06/07/1982
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Akiba, Yutaka, Futami, Toshio, Suda, Teruo
• Primary Examiner(s): Grimley, A. T.
• Assistant Examiner(s): NIMMO, MORRIS
• Application Number:
  US06/500,903
• Time in Patent Office: 858 Days
• Field of Search: 174/113 R, 174/33, 174/120 SR, 174/128 BL, 336/222, 336/227
• US Class Current: 174/114.00R
• CPC Class Codes: H01B 7/303 Conductors comprising interwire insulation
• CPC Class Codes: H01F 5/06 Insulation of windings
• CPC Class Codes: Y10S 174/26 having a plural-layer insulation system

Abstract

A plurality of strands each comprising a conductor covered with an insulating layer and then with an adhesive layer are twisted together and fixed to each other by fusing of the adjacent adhesive layers to form a litz wire which will not be deformed even by an external force.

Claims

1. A litz wire formed of a plurality of twisted strands, each of the strands comprising a conductor covered with an insulating layer, wherein said insulating layer of each of said strands is covered over the peripheral surface thereof with a first adhesive layer for effecting adhesion between adjacent strands, and adjacent first adhesive layers are fused together to fix the twisted strands and the plurality of fixed strands is covered with a second adhesive layer;

said first adhesive layer comprising a thermoplastic resin and said twisted strands covered with said first adhesive layers being heated so that the first adhesive layers are softened and fused to fix each strand.

2. A litz wire according to claim 1, wherein said second adhesive layer comprises a thermoplastic resin.

3. A litz wire formed of a pluarlity of twisted strands, each of the strands comprising a conductor covered with an insulating layer, wherein said insulating layer of each of said strands is covered over the peripheral surface thereof with a first adhesive layer for effecting adhesion between adjacent strands and the adjacent first adhesive layers are fused together to fix the twisted strands;

the film thickness of the insulating layer on each of said strands being selected to provide a finished outer diameter (d) which is defined by

space="preserve" listing-type="equation">de<

d≦

0.93 de.sup.0.95

wherein de is the diameter of the conductor.

4. A litz wire comprising:

a plurality of twisted strands, each of said strands comprising a conductor covered over the periphery thereof with a first insulating layer and a first adhesive layer formed over each of said first insulating layers and fused to adjacent first adhesive layers to fix the twisted strands; and

a second insulating layer covered on the peripheral surface of a fixed assembly of said plurality of twisted strands.

5. A litz wire according to claim 4, wherein said first adhesive layer comprises a thermoplastic resin and the twisted strands are heated so that each adhesive layer is softened and fused to fix the strands.

6. A litz wire according to claim 4, wherein the film thickness of the first insulating layer on each of said strands, is selected to provide a finished outer diameter (d) which is defined by

7. A litz wire according to claim 4, wherein said second insulating layer is covered over and outer surface thereof with a second adhesive layer.

8. A litz wire according to claim 7, wherein said second adhesive layer comprises a thermoplastic resin.

9. A litz wire according to claim 4, wherein said conductor is formed of electrically conductive metal.

10. A litz wire according to claim 9, wherein said metal comprises copper.