JP3114940B2 - Self-fusing enameled wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-fusing enameled wire, and more particularly to a self-fusing enameled wire having excellent hot-air fusibility and good high-speed winding property.

[0002]

2. Description of the Related Art Conventionally, electric devices such as motors and transformers are subjected to an impregnating varnish treatment after winding of a coil in order to improve the electrical, mechanical properties and environmental resistance of the coil.

However, in this method, the varnish solvent must be removed and dried and cured after the treatment, which leads to a problem that not only is the equipment expensive, but also environmental pollution occurs in the impregnating varnish treatment step. .

[0004] For this reason, self-fusing enameled wires have been used, which can be heated or subjected to a solvent immersion treatment on the insulated wire to fix the wire between the insulated wires in order to omit and simplify the impregnation process. Have been.

For example, Japanese Patent Application Laid-Open No. 39-26872 discloses that a paint comprising a mixture of an alcohol-soluble copolymerized polyamide resin and a stabilized isocyanate and an epoxy condensate is mixed on a conductor or other paint. A self-fusing insulated wire having excellent heat resistance by coating and baking through an insulating film is disclosed. Further, Japanese Patent Application Laid-Open No. 45-2
No. 944 discloses a copolymerized polyamide resin and a phenolic resin.
An insulated wire is formed by applying an insulating paint made by dissolving a thermosetting resin of any one of a phenolic resin, an epoxy resin, and a phenolic resin-modified epoxy resin in a solvent, and baking it to form a coil. A manufacturing method is disclosed.

More specifically, the method for producing a coil-formed body of an enameled wire is as follows: (1) a method in which an enameled wire is formed into a coil shape, then immersed in a varnish and then solidified with the varnish; After forming the coil, the wires are fused together while blowing hot air.

[0007]

In recent years, manufacturers of coils using such self-fusing enameled wires have
In order to speed up and eliminate the manufacturing process, a high-speed automatic winding machine is used to perform unmanned operation at night to reduce the processing cost of the coil manufacturing process.
It is necessary to blow the hot air as described above, and there is a problem in releasing from the mold and deformation of the coil.

On the other hand, a self-fusing enameled wire uses a solvent such as alcohol to swell the fusion layer in order to maintain the shape of the coil. A mold release agent such as liquid paraffin must be sprayed onto the mold each time in order to impart releasability to the mold.

[0009] Therefore, the environment is contaminated by alcohol, fats and the like, and the flat coil has a problem that the fusion layer is deformed when returning to room temperature by heat treatment.

In order to solve these problems, fusion is performed at a relatively low temperature to impart lubricity to the self-fused enameled wire, reduce mechanical damage during high-speed winding, and release from the mold. It is necessary to improve the performance.

An object of the present invention is to eliminate the drawbacks of the prior art, to provide high-speed winding properties and heat-sealing properties in a coil manufacturing process, and to quickly use a mold release agent after winding without using a release agent. An object of the present invention is to provide a self-fusing enamel wire that can be released from the mold.

[0012]

A self-fusing enamel wire according to the present invention for solving the above-mentioned problems is obtained by using Novo with respect to 100 parts by weight of a copolymer polyamide resin containing 12 nylon.
5-30 parts by weight of a rack-type alkylphenol resin, charcoal
0.1 to 10 times higher fatty acid ester having a prime number of 10 or more
Parts by weight and 0.1 to 10 parts by weight of polyethylene wax.
This is obtained by applying and baking the coating material on a conductor via another insulating material .

[0013]

The copolymerized polyamide resin of the present invention includes 6-66, 6-12 and 6-66-6-10, all of which have poor heat fluidity. For this reason, a 12-nylon copolymerized polyamide resin such as T-45 manufactured by Daicel Co., Ltd.
1, N-1901, N-1940, Nippon Rilsan M-
Commercial products such as 1422 and M-1425 were selected.

In addition, it is necessary to fuse the wires while blowing hot air during coil winding. However, it is difficult to improve the cohesive force between the fused materials only by using a copolymerized polyamide resin. For this purpose, a novolak-type alkylphenol resin such as Hitachi-114 manufactured by Hitachi Chemical Co., Ltd.
By experimentally finding the use of 0, -1135, -1501, or the like, the thermal fluidity and the fusibility can be further improved.

The amount of the novolak type alkylphenol resin is preferably 5 to 30 parts by weight based on 100 parts by weight of the copolymerized polyamide resin. That is, when the novolak type alkylphenol resin is less than 5 parts by weight, the heat fluidity is poor, and when it is more than 30 parts by weight, the adhesive strength is reduced.

On the other hand, at the time of coil winding, it is necessary to arrange the windings in order to improve the space factor of the coil (alignment winding property). Therefore, as a material having excellent stability with the self-fusing material and having a low static friction coefficient, a carbon number of 10
The above higher fatty acid esters, for example, # 31 manufactured by Sakamoto Yakuhin
Good results were obtained by using 0, # 500, # 750, Kao wax EB-G and the like. Further, at the time of high-speed winding, it must be excellent in terms of releasability from a mold. For this purpose, a polyethylene wax, for example, Sanwax 131-P, 151-P,
It has been found that by using 61-P or the like, the releasability can be significantly improved.

The amount of the aliphatic polyester and polyethylene wax used for imparting self-lubricating properties and mold release properties is preferably 0.1 to 10 parts by weight for 100 parts by weight of the copolymerized polyamide resin. . Outside of this range, lubricity and releasability will be poor, and paint stability will be poor.

Examples of the insulator for the base enameled wire of self-fusing enameled wire include polyurethane, polyvinyl formal, polyester, polyesterimide, and the like.
There are polyamide imide and polyimide.

[0019]

EXAMPLE A polyurethane paint was applied and baked on a conductive wire having a conductor diameter of 0.28 mm so as to have a thickness of 10 μm according to a usual method.

Next, 85 parts by weight of Daicel wire T-451 and 15 parts by weight of M-1452 manufactured by Nippon Rilsan Co., Ltd. were blended with 15 parts by weight of Nylon copolymer polyamide resin as a fusible material, and the resultant was mixed with Hitachi H-1140 was dissolved by heating in a cresylic acid solvent in an amount of 10 wt% with respect to 100 parts by weight of the copolymerized polyamide resin, and then Kao wax EB-G and sun wax 151 were dissolved.
-P was added in an amount of 2 parts by weight and 3 parts by weight with respect to 100 parts by weight of the copolymerized polyamide resin, and finally dissolved uniformly to obtain a fusing coating.

This coating material was repeatedly applied and baked on a polyurethane enameled wire to obtain a self-fusing enameled wire having a thickness of 7 μm for a fused layer.

The self-fused enameled wire of Example 1 obtained by the above-mentioned operation was heated with a PNS-51 winding machine (manufactured by Nippon Service Co., Ltd.) at a hot air blowing temperature of 350 ° C. and a coil winding number of 215 turns. The coil was examined at 1600 rpm for various properties of the coil after winding, that is, the adhesive strength of the coil, the alignment winding property, and the releasability.

By the same method, test pieces were prepared in which copolymerized polyamide resin, alkylphenol resin and other additives were mixed at various ratios (Examples 1 to 7).

For comparison with the above example, a copolymerized polyamide resin T-
451, M-1425 and the like were heated and dissolved in cresylic acid, and several kinds of self-fusion coatings were applied and baked to obtain enameled wires (Comparative Examples 1 to 4).

[0025]

[Table 1]

Table 1 shows the compositions and characteristic values of Examples 1 to 7 and Comparative Examples 1 to 4 collectively.

Here, the adhesive strength of the coil is a tensile force that applies a tensile force to both ends of the coil molded body at room temperature and peels off between the adhesive layers, and the alignment winding property is relative to a normal winding state. Value (%).

According to Table 1, as in Examples 1 to 7, various types of enameled wires coated and baked with a fusion material containing appropriate amounts of a copolymerized polyamide resin, an alkylphenol resin, a fatty acid polyester and a polyethylene wax were blended. The characteristics are all good, but it was confirmed that the characteristics of the coil were inferior to those of Examples 1 to 7 when the blending ratio of the fusion material was changed as in Comparative Examples 1 to 4. Was done.

In the case where 11 parts by weight of the aliphatic polyester and the polyethylene wax were added, the paint became cloudy, the appearance of the enameled wire was poor, and the characteristics were not evaluated.

As described above, the enameled wire of the present invention has excellent self-fusion properties in terms of coil characteristics such as coil adhesive strength, alignment winding property, and mold release property.

[0031]

According to the present invention, an enameled wire having excellent coil adhesive strength can be obtained, a mold release agent is not required in the manufacturing process, and the alignment winding property is good. It greatly contributes to realizing the winding property and is industrially effective.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Koichi Morita 108-8, Sayamagahara Matsubara, Iruma-shi, Saitama (72) Inventor Yasuhiro Katakura 2044-6, Inakichi Kamiyoshi, Chiyoda-mura, Shinji-gun, Ibaraki Prefecture (72) Inventor Hirohide Wada Ibaraki Examiner Yasuharu Takagi 2044 No.6, Inakichi Chiyoda-mura, Chiyoda-mura, Japan (56) References JP-A-62-86609 (JP, A) JP-A-2-135610 (JP, A) JP-A-56-86410 (JP, A) JP-A-63-178410 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01B 7/02 H01B 3/30

Claims (1)

(57) [Claims] 1. A copolymerized polyamide resin containing 12 nylon.
Novolak type alkylphenol to 100 parts by weight
5-30 parts by weight of resin, higher fatty acid having 10 or more carbon atoms
0.1 to 10 parts by weight of ester and polyethylene wax
Paint on the conductor containing 0.1 to 10 parts by weight of
Self-fusing enameled wire characterized by being applied and baked through an edge .