JPH0562918U - Self-bonding litz wire - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a self-bonding litz wire that is flexible and does not return the twist even when wound around a coil. [Structure] Strands are formed by twisting a wire provided with a self-bonding portion 12 made of a thermoplastic resin along a longitudinal direction on a part of the outer circumference of an insulating wire in which a conductor 10 is covered with an insulating film 11. It is a self-bonding litz wire having a structure in which several of the insulating element wires are heated and melted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a litz wire suitable for a low loss coil such as a high frequency transformer and a deflection yoke.

[0002]

[Prior Art]

 Conventionally, as a litz wire used in high frequency transformers, a plurality of strands with an insulating film twisted together have been used. However, since the individual strands of these litz wires are not fixed, the twist of the strands is likely to return during coil winding. Therefore, there is a problem that the coil is apt to be flattened and the coil cannot be finished with a predetermined number of turns.

[0003]

[Problems to be solved by the device]

 In order to solve the above problems, a self-bonding litz wire as shown in FIG. 3 was devised. This self-bonding litz wire is obtained by providing a self-bonding layer 3 on the outer periphery of a conductor 2 covering the insulating layer 1, twisting the self-bonding insulating wires, and then heating them to integrate them. Is. However, since the self-bonding Litz wire is provided with the self-bonding layer 3 over the entire circumference of each wire, the flexibility after heating and curing is poor and the twisting returns during coil winding. It was difficult to coil into a shape.

Therefore, an object of the present invention is to provide a self-bonding litz wire that is flexible and does not return the twist even when wound around a coil.

[0005]

[Means for Solving the Problems]

 The self-bonding litz wire according to the present invention is a self-bonding litz wire in which an insulation wire having a self-bonding portion is twisted and heated. Further, it is provided along the longitudinal direction.

[0006]

[Action]

 The self-bonding litz wire of the present invention is provided with a self-bonding portion along the longitudinal direction only on a part of the outer circumference of each insulation wire, and all the twisted wires are heated by twisting them together. Of the insulation strands, only some arbitrary insulation strands are fused together.

[0007]

【Example】

 An example of the self-bonding litz wire of the present invention will be shown below. First, a description will be given with reference to FIG. The conductor 10 is covered with an insulating film 11 made of polyurethane, polyester, polyesterimide, polyamideimide or the like. Along the outer circumference of this insulating wire, one self-fusing part 12 made of a thermoplastic resin such as polyamide, polysulfone, epoxy resin, or phenoxy resin is formed along the longitudinal direction so as to form a gentle mountain shape. It is provided in a stripe shape. In order to manufacture the self-bonding Litz wire as shown in FIG. 1, seven insulating wires 13 having the self-bonding portion or the insulating wire 13 having the self-bonding portion and a normal insulating wire are used. A total of seven wires 14 are mixed and twisted to form a twisted wire, which is sequentially heated to melt the self-bonding portion 12 and then cooled. An arbitrary number of the individual wires 14 which are twisted together through the self-bonding portion 12 are fixed, and the remaining several are not fixed. Further, the self-bonding portion 15 exposed on the outer peripheral surface melts along the outer periphery of the insulating wire so that a slight ridge is left when heated, but this is much smaller than the insulating wire. , Does not affect the winding on the specified coil. The self-bonding portion 12 may be provided intermittently on the outer circumference of the insulating wire, and is not limited to being provided in a single streak shape in short, and only on a part of the outer circumference of the wire. It should be provided.

[0008]

[Effect of the device]

 The self-bonding litz wire of the present invention is provided with a self-bonding part along the longitudinal direction only at a part on the outer circumference of each of the twisted insulated wires, thereby forming a twisted insulated wire. Only a few of the arbitrary wires are glued together. Therefore, since the insulation wire is not fixed over the entire outer circumference, flexibility is not impaired, and there is no untwisting, which facilitates winding work.

[Brief description of drawings]

FIG. 1 is a sectional view showing a conventional self-bonding Litz wire.

FIG. 2 is a cross-sectional view showing an insulating wire having a self-bonding portion of the present invention.

FIG. 3 is a sectional view showing an embodiment of the self-bonding litz wire of the present invention after being heat-bonded.

[Explanation of symbols]

 10 ... Conductor 11 ... Insulating film 12 ... Self-fusion part

Claims (1)

[Scope of utility model registration request] 1. A self-bonding litz wire for twisting and heating an insulating wire having a self-bonding part, wherein the self-bonding part is part of the outer circumference of each insulating wire along the longitudinal direction. A self-bonding litz wire characterized by being provided as.