JPS63195912A - Enamelled twisted wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an enameled stranded wire. More specifically, the present invention relates to an enameled stranded wire having a central enameled wire strand in the center and a plurality of outer enameled wire strands concentrically twisted around the outer periphery thereof.

[Prior Art] Since enameled M wire is made by twisting a plurality of enameled wire strands, it has excellent coil winding efficiency for electrical equipment, and has recently been widely used.

A conventional enameled ms is made by twisting a plurality of enameled wires 1 together, as shown in FIG. However, this enameled stranded wire, which is made by twisting multiple enameled wires together, tends to come loose when it is wound into a coil, resulting in poor appearance of the coil and poor productivity in coil winding due to repair work. Ta.

On the other hand, in order to prevent this unraveling, an enameled stranded wire in which all the wires are made of self-bonding enamel has been considered. However, with enameled stranded wires in which all cable wires are made of self-bonding enamel, the dimensions of the stranded enamelled wires become large because a self-bonding layer is provided on all the wires, and as a result, the dimensions of the coil become large.
There is the disadvantage that the advantage of using enamel stranded wire is lost, and since the entire strand is fused together, the enamel strand becomes hard, resulting in poor winding properties. Moreover, the use of self-bonding enamel is expensive. There is a drawback that the coil manufacturing cost increases.

[Problems to be Solved by the Invention] The present invention has been made based on the above points, and its purpose is to eliminate the drawbacks of the prior art described above and to reduce the dispersion during coil winding. To provide an enameled stranded wire which has no increase in the diameter of the stranded enameled wire and has excellent coil windability.

[Means for Solving the Problems] The gist of the present invention is that only the central enameled wire is a self-bonding enameled wire, and the outer enameled wire is partially bonded by 1 m% through the fusing layer. The present invention relates to an enameled stranded wire characterized by comprising: I.

In the present invention, the outer circumference enameled wire may be any wire that is industrially used, and for example, formal wire, polyurethane enameled wire, polyester enameled wire, polyesterimide enameled wire, polyamide-imide enameled wire, and polyimide enameled wire can be used. can. Alternatively, a composite enameled wire may be used, in which the upper layer of the enameled wire is overcoated with a polyamide paint, a linear polyester paint, or a polyamide-imide paint.

In the present invention, the self-bonding enameled wire of the central enameled wire is one made by coating and baking a fusing paint on a conductor, or a general enameled wire such as formal wire, polyurethane enameled wire, polyester enameled wire, polyurethane enameled wire, etc. 1
The wires used include stellimide enameled wire, polyamide-imide enameled wire, polyimide enameled wire, various composite enameled wires, etc., with a fusion coating applied and baked on the upper layer. The thickness of the fusion layer may be such that the plurality of enamelled wires on the outer periphery are partially fused, and specifically, the thickness is 0.007 to 0.5 s.
That's about it. As the adhesive layer material, polyvinyl butyral resin, copolyamide resin, phenoxy resin, polysulfone resin, etc. can be used.

In the present invention, the fusing method for partially fusing the self-fusing enameled wire and the plurality of enameled wire strands on the outer periphery may be either thermal fusing or solvent immersion fusing.

[Function] The enameled stranded wire of the present invention is an enameled stranded wire in which a self-bonding enameled wire is used as the central enameled wire strand of the stranded wire, and the outer enameled wire is partially fused to the fusion layer. By doing so, it effectively suppresses the unraveling of the enameled stranded wire, improves its flexibility, and furthermore prevents the increase in the outer diameter dimension and significantly increases the coil space factor of the electrical equipment coil obtained by coil winding. The aim is to improve

In the enameled stranded wire of the present invention, the fusion between the self-welding enameled wire strand and the outer periphery enameled wire strand can be kept small during the stranding stage, and the strand can be strongly fused after coil winding. In order to reduce the fusion strength, heat fusion is performed at a low temperature, or the fusion layer is immersed in a solvent with low solubility. On the other hand, to increase the strength of the fusion bond, heat fusion is performed at a high temperature, or the fusion layer is immersed in a solvent that has high solubility. For example, when using a self-fusing enameled wire made of copolymerized polyamide resin as the RA bonding layer, in order to reduce the fusing strength, the heat fusing temperature should be set to 165°C or less, or the fusion fusing should be immersed in solvent naphtha at room temperature. do. On the other hand, in order to increase the fusion strength, the heat fusion temperature should be set to 175° C. or higher, or the material should be immersed in ethanol.

[Example] Next, an example of the enamel stranded wire of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing one embodiment of the enamel stranded wire of the present invention. In FIG. 1, reference numeral 1 denotes an outer circumferential enamelled wire strand, and this outer circumferential enamelled wire strand 1 is provided with a polyamide-imide enamel coating 12 on the upper layer of a conductor 11. 2 is a self-fused enameled wire strand which is the central enameled cable wire;
A polyamide-imide enamel film 22 is provided on the upper layer of the conductor 21, and a copolymerized polyamide enamel film 2 is further provided on the upper layer.
3. In FIG. 1, a self-fusing enameled wire element tI of the outer enameled wire element 1 and the center enameled wire is shown.
J2 is partially fused at the contact portion 30 which is twisted together by air drying after immersion in ethanol at room temperature. Therefore, this embodiment of the enamel stranded wire of the present invention does not increase the stranded wire diameter, does not come loose during coil winding, and is flexible and has good winding properties. .

[Effects of the Invention] The stranded enameled wire of the present invention is a self-bonding enameled wire with a central enameled wire! ! Since the outer enamelled wire strands are partially fused through the adhesion layer, there is no unraveling during coil winding, no increase in stranded wire diameter, and flexibility, resulting in less space. It is capable of producing coils with good efficiency and high productivity, and is suitable for industrial soil and stone work.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the enamel stranded wire of the present invention, and FIG. 2 is a cross-sectional view of a conventional enamel I! It is a cross-sectional view showing an example of a line. 1: Bummel wire, 11: )9 body, 12: enamel film, 2: self-bonding enameled wire, 21: conductor, 22: enamel film, 23: fusion layer, 30: fusion part.

Claims (1)

[Claims] (1) In an enameled stranded wire in which there is a central enameled wire strand in the center and a plurality of outer enameled wire strands are concentrically twisted around the outer periphery, the central enameled wire strand is made of self-fused enamel. 1. An enameled stranded wire, characterized in that the outer peripheral enameled wire strands are partially fused together via a fusion layer.