JPH03201514A - Self-fusing fixing thread - Google Patents

Abstract

PURPOSE:To fasten a fixing thread firmly on heating and adhesion, and to prevent the fraying and falling of the fixing thread by winding the fixing thread impregnated with a bonding resin fused with a self-fusing enamel wire on a coil body using the self-fusing enamel wire and temporarily fixing the fixing yarn so as to hold a coil shape. CONSTITUTION:A self-fusing fixing thread 1 is acquired by impregnating fixing thread 2 with a bonding resin 3, the fibrous material of the fixing thread 2 is put into practical use, and a polyester thread is normally suitable. A resin fused to a self-fusing enamel wire 4 and having adhesion on heating can be used as the bonding resin 3, a resin material of the same group as the self-fusing layer of the outermost layer of the self-fusing enamel wire 4 is particularly favorable. The self-fusing fixing thread 1 is wound on a coil body 5 manufactured by winding the self-fusing enamel wire 4 in a coil shape, and fixed temporarily so as to hold a coil shape. When the self-fusing fixed yarn 1 temporarily fixed to the coil body 5 is heated and self-fused and cooled and fastened in the coil shape, the bonding resin 3 is fused to the self-fusing enamel wire 4, and the fixing thread 2 are fixed to the coil body under the state in which the fixing thread 2 are fastened firmly to the coil body.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention is directed to a coil body formed by winding a self-bonding enameled wire into a coil shape when a coil is produced using a self-bonding enameled wire. The present invention relates to a fixing thread for holding a coil shape by winding the fixing thread around the body, and particularly to a self-fusible fixing thread that prevents the fixing thread from fraying by fusing the fixing thread to the coil body when the coil body is heated and fused.

"Conventional technology" Conventionally, when manufacturing coils for motors, etc., conductive wire was wound into a coil, first wound and fixed with a fixing thread, then dipped in impregnated varnish, and then heated in an oven, etc. Dry and fix.

Although this method can completely fix the coil, it requires a lot of equipment such as an impregnating varnish tank and an oven during the impregnation process, and has the disadvantage that the working environment is deteriorated by the solvent of the impregnating varnish.

Another drawback was that more impregnated varnish adhered to the coil than necessary.

As a method to improve this, a coil manufacturing method using a self-bonding enameled wire in which a self-bonding layer is provided on the outermost layer of the enameled wire used for the coil is being researched. In manufacturing a coil using this self-bonding enamelled wire, it is possible to fix the wire into a coil by winding the wire into a coil and then heating it to cause self-fusion.

According to this method, only an oven is required as equipment, and there is no deterioration of the working environment due to the evaporated solvent of the impregnated varnish. Furthermore, excess fusion resin on the coil can be reduced.

"Problem to be Solved by the Invention" However, when a coil is made using this self-fusing enameled wire, the fixed thread is fused together with the self-fusing layer of the enameled wire after heat fusing. There was a problem in that this fixed thread frayed during use of the coil, and in a motor etc., the fixed thread came off the coil and got entangled with the motor bearing etc., leading to motor failure. This has been a particularly serious problem for motors with a closed structure.

An object of the present invention is to provide a fixing thread for temporarily fixing a coil, which can prevent the fixing thread from fraying and falling off.

"Means for Solving the Problems" The self-adhesive fixed thread of the present invention is a self-adhesive fixed thread that is wound around a coil body formed by winding a self-adhesive enameled wire into a coil shape to maintain the coil shape. It is impregnated with an adhesive resin that fuses with the fusible enameled wire, and was used as a means to solve the problem.

"Function" The self-fusible fixed thread of the present invention is wound around a coil body using self-fusible enamelled wire and temporarily fixed to maintain the coil shape, and when it is heated and fused, The adhesive resin impregnated into the fusible fixing thread is fused to the self-fusible enameled wire, and the fixing thread is firmly fixed to the coil body.

Embodiment FIG. 1 is a diagram showing an embodiment of the present invention, and reference numeral 1 in the figure indicates a self-fusible fixed thread. This self-fusible fixed thread 1 is made by impregnating a fixed thread 2 with an adhesive resin 3.

As for the material of the fixed thread 2, any fibrous material is suitable for practical use, and cotton thread, polyester thread, polypropylene thread, aramid thread, etc. are appropriately selected and used depending on their heat resistance, but usually polyester thread is used. is preferably used.

As the adhesive resin 3 impregnated into the fixed thread 2, any material can be used as long as it has the adhesive strength to fuse the self-adhesive enameled wire 3 when heated, and from the viewpoint of heat resistance, copolymer Polyamide resin, epoxy resin, phenoxy resin, polyvinyl butyral resin, etc. are preferably used. Also,
A crosslinking acid component such as a polyvalent isocyanate compound, phenol resin, or melanin resin, or a polymerization catalyst such as an organic titanium compound may be added to these resins.

Furthermore, as the adhesive resin, resin materials of the same type as the outermost self-fusing layer of the self-fusing enameled wire used for manufacturing the coil, such as polyamide, polyvinyl butyral, polysulfone, polyethersulfone, epoxy resin, phenoxy Resins such as resins are particularly preferred. In this way, by using the same material for the adhesive resin and the self-fusing resin of the self-fusing enameled wire, the effect on the insulating layer of the enameled wire during heat fusing of the coil body is reduced both chemically and physically. will also decrease.

Next, an example of a method for manufacturing a coil using this self-fusible fixed yarn 1 will be explained.

FIG. 2 shows a coil body 5 made by winding a self-bonding enameled wire 4 into a coil shape according to desired dimensions and shape.
This shows that. This self-bonding enameled wire 4 is made of polyurethane, polyvinyl formal, polyester, polyester imide, polyhydantoin, polyamide imide, polyester amide imide, polyhydantoin ester, polyester, etc. An insulating layer made of a resin such as amide is provided, and a self-fusing layer of polyamide, polyvinyl butyral, polysulfone, polyethersulfone, epoxy resin, phenoxy resin, etc. is provided on this insulating layer.

Next, as shown in FIG. 3, a self-fusible fixing thread 1 is wound around the coil body 5, and temporary fixing is performed so as to maintain the coil shape of the coil body 5.

Next, the temporarily fixed coil body 5 is heated to self-fuse. The temperature at this time is set appropriately depending on the material of the self-bonding resin, but it is set within a temperature range that is higher than the heat distortion temperature of the self-bonding resin used and lower than the temperature at which the resin starts flowing. .

This heating causes the coil body 5 to self-fuse, and by further cooling it, it is fixed into a coil shape, and the adhesive resin 3 impregnated into the self-fusing fixing thread 1 is bonded to the self-fusing enameled wire. 4, and the fixed thread 2 is firmly fixed to the coil body.

In the coil produced in this way, the fixed thread 2 is firmly fixed on the coil and does not fray during use, so there is no problem such as the fixed thread 2 coming off the coil getting entangled with the motor shaft. It can be prevented.

(Example) A polyester resin paint (Telebec E1050, manufactured by Dainichi Kakogyo Co., Ltd.) was baked on a 1.0 mmφ copper wire, and then a phenoxy resin paint (Tobu Kasei YP-50) was applied and baked on the second layer. A fusible enamelled wire was obtained.

This enameled wire was wound into a coil to create a motor coil body, and a self-adhesive fixing material was created by pre-impregnating a 0.8mmφmm upper stell thread (braid) with phenoxy resin paint (Tobu Kasei, YP50). After winding the yarn and temporarily fixing it, it was heated in an oven at 130° C. for 30 minutes, and then taken out and fixed to produce a motor coil, and further, a motor was produced using the obtained coil.

(Comparative Example) A motor was produced by performing the same operation using a 0.8 mmφmm upper stell yarn that was not impregnated with resin instead of the self-fusible fixed yarn used in the above example.

After operating these motors continuously for 100 OT (r), we checked the condition of each fixed thread, and found that in the example, there was no fraying of the fixed thread, and the coil and fixed thread remained completely fixed. Ta.

On the other hand, in the comparative example, some of the polyester threads were found to be frayed, the threads were wrapped around the motor bearing, and some were charred and discolored.

"Effects of the Invention" As explained above, the self-fusible fixed thread of the present invention is obtained by impregnating the fixed thread with an adhesive resin that fuses to the self-fusible enameled wire. When creating a coil by winding it around a coil body using enamelled wire and temporarily fixing it, the self-fusible fixing thread is firmly fixed, so the self-fusible fixation occurs while the coil is in use. The thread does not become frayed, and problems such as the fixed thread coming off the coil becoming entangled with the motor bearing can be prevented.

In addition, when the self-fusing layer of the self-fusing enameled wire and the adhesive PI resin are made of the same resin material, it is chemically and physically stable with respect to the insulating layer of the enameled wire of the coil, and It is possible to reliably maintain stable insulation. Furthermore, since it does not interfere with the heating and fusing of the coil, it is possible to produce a high-quality coil.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the self-fusible fixed yarn of the present invention, and an enlarged view of the main part of the self-fusible fixed yarn, and FIG. 2 and FIG. FIG. 2 is a perspective view of the coil body, and FIG. 3 is a perspective view showing the state of the coil body during temporary fixation. l...Fixed thread, 2...Thread, 3...
・Adhesive resin, 4...Self-adhesive enameled wire, 5.
...Coil body.

Claims (2)

[Claims] (1) A fixed thread that is wound around a coil body formed by winding a self-fusible enameled wire into a coil shape to maintain the coil shape, and an adhesive that fuses the self-fusible enameled wire to the fixed thread. A self-adhesive fixed thread characterized by being impregnated with a synthetic resin. (2) The self-fusible fixed yarn according to claim 1, wherein the adhesive resin is the same material as the outermost self-fusible layer of the self-fusible enamelled wire.