JPS59117447A - Treating method of coil of motor for refrigerator - Google Patents

Abstract

PURPOSE:To shorten the manufacturing steps of a product having excellent coolant resistance by winding an enameled wire in the slot of a stator core, and treating a bisphenol type epoxy resin and phenol resin with solvent type varnish. CONSTITUTION:An enameled wire is wound on a core of a stator of a motor for a refrigerator. Bisphenol type epoxy resin having approx. 300-1,000g/eq of epoxy equivalent and phenol resin are dissolved in a mixture solvent of aromatic solvent and alcohol, and mixed with imidazole to produce a solvent type varnish, which is flowed down to dry a varnish on the coil. In this manner, drying time can be shortened to manufacture a product having excellent coolant resistance.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for processing a coil of a moltler for a refrigerator, and in particular, a mold for a refrigerator suitable for shortening the face processing time for fixing the coil. The present invention relates to a method for processing a coil.

[Prior art]

According to the varnish manufacturer's catalog and technical data, the drying temperature and time for the Shio varnish treatment for fixing the coils of a 1-frame refrigerator mold is 5 hours or more for Company A's solvent-based fest (phenol-modified epoxy) at 163'0. It becomes. In addition, eight companies' solvent-based varnishes (phenol-modified epoxy) can be used for 12 hours at 165°C to 150°C! The duration is 1 to 8 hours.

As mentioned above, conventional solvent-based festivals require high drying temperatures or long drying times.

There was a drawback that a lot of energy was required to completely harden the fest.

As for drying varnishes, solvent-free varnishes are generally used. This solvent-free festival is a method of hardening the festival in a short time by adding a curing agent or a curing accelerator to the base resin. As an example, Japanese Patent Application Publication No. 1973-
According to Publication No. 95203, the epoxy equivalent is about 180-2
There is a solvent-free festival made by mixing 00g/eq of bisphenol-type epoxy with a modified aromatic amine or imidazole whose main component is metaphenylenediamine. When processing with this solvent-free varnish, processing equipment is generally more expensive than with solvent-based varnish, and mass production is poor. Furthermore, since solvent-free varnish is for general motors, and because it adheres to the coils, good characteristics can be obtained for general motors, but if a large amount of varnish adheres to the refrigerant, it may have the disadvantage of poor flexibility. Generally speaking, cooling varnishes are treated in a thin layer.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for treating a coil of a refrigerator mold, which reduces refrigerant resistance, reduces varnish drying time, and further reduces equipment costs. be.

[Summary of the invention]

Therefore, we decided to combine the hardening agents and accelerators used in solvent-free varnishes with conventional solvent-based varnishes for the next layer, and investigated [
As a result, we discovered that even solvent-based varnishes can be made into quick-drying varnishes depending on the type and proportion of the hardening agent, and by developing a varnish with excellent refrigerant resistance, we were able to achieve the above objectives. It is something. That is, the present invention winds an enameled electric wire in the slot of a stator core, and wraps the enameled electric wire with an epoxy equivalent of about 300 to 10.
00g/eq of bisphenol type epoxy resin and phenol resin are dissolved in a mixed solvent of aromatic solvent and gamma alcohol type, and treated with a solvent type varnish made by mixing imidazole.

[Embodiments of the invention]

Examples of the present invention will be described below.

The varnish for refrigerator molds is used in cold K (R2:1) and refrigerator oil, so it must be sufficiently hardened. Therefore, in order to find a solvent-based varnish that dries quickly, a surface hardening test and a refrigerant resistance test were conducted as a method for evaluating various varnishes.

In other words, varnishes include (a) phenol-modified epoxy with modified aromatic polyamine added (varnish) (b) phenol-modified epoxy with modified aliphatic polyamine added (varnish) (c) phenol-modified epoxy with modified aliphatic polyamine added (varnish) The surface hardening properties of a product containing imidazole (Varnish ■) and a product containing a phenol-modified epoxy and a tertiary R amine (Varnish ■) were determined by the method of J.E.S., C2103.

In addition, a test piece coated on an iron plate and a test piece coated on a helical coil (polyamide-imide undercoated modified formal enameled wire) by J Kogyo S, Czio 3 were used.

Then, put the refrigerating machine oil (Suniso 4GS) and the test piece into an autoclave (pressure vessel), cover it with a lid, and heat it for 10 minutes.
Vacuum degas at 5°C. Then - the autoclave is cooled and filled with refrigerant (R22). The mixing ratio of refrigerant and refrigeration oil was 1:1 by weight. Then - the autoclave is heated at 125 DEG C. for 168 hours. After completion, cool to room temperature, open the lid, take out the test piece, and place it in a constant temperature bath for 1 hour.
Heat treatment to 30℃ (the previous operation is called refrigerant treatment)
After that, the appearance was observed (foaming property) and the adhesive strength of the helical coil was measured. The results are shown in Table 1.

In this table, the evaluation symbols for foaming properties are as follows: x mark≠: significant foaming; ■ mark indicates no foaming. In addition, the adhesive strength evaluation symbol is ◎
Mark ≠; Ichiban (first place was marked with ○, △, and X).

From Table 1 above, it can be seen that varnish (1) has a fast surface curing property and is excellent in terms of foamability and high-temperature adhesive strength in the refrigerant test.

Next, experiments were conducted on the amount of imidazole added and the weight change rate characteristics after the refrigerant test due to dry darkness.

In other words, a varnish containing 0% to 0.1% imidazole added to a phenol-modified epoxy solvent was applied to an iron plate, and after treatment with a refrigerant, the refrigerating machine oil was removed with a solvent, and the weight loss was measured after heating and drying. The attached figure shows the results. Shown below.

In this figure, the horizontal axis shows the drying time (135°0), and the vertical axis shows the weight change rate. Further, in the figure, the ag imidazole θ%, b is the characteristic due to the addition of 1% taimidazole Q, and the addition of a small amount shortens the curing time of the varnish by -1 t: min 7>.

Next, from these experimental results, according to the specifications shown in Table 2, the varnish was a phenol-modified epoxy solvent varnish with no added imidazole and a varnish with no imidazole added.
．． 7.5KW and 11K of ■d varnish added with 5%
A mold for a refrigerator was manufactured by applying the varnish to the coil end of a W real 4mm stator and hardening the varnish.

Table 6 shows the results of coil electromagnetic vibration of a mold manufactured using a drying time ratio of 100 for A varnish (■) and 50 for D varnish (In) in this varnish treatment.

Table 3 In other words, electromagnetic vibration was measured as one method of determining the adhesion state of the varnish on the coil end.

As can be seen from Table 6 above, for varnish a, 1
With the D varnish of 111ff-1 when dry, the same or better results can be obtained.

In addition, in these experiments, the above-mentioned J Engineering S-0 was used for the W wire of one electric wire.
A helical coil according to 2103 was used.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, a bisphenol type epoxy resin and a phenol resin having an epoxy equivalent of about 300 to 1 ooog/eq are dissolved in a mixed aromatic and alcoholic solvent, and imidazole is mixed therein. Since the enameled wires are treated with a solvent-based varnish, the use of the aforementioned varnish not only provides the benefits of refrigerating machine molds with excellent refrigerant resistance, but also reduces the varnish drying time by approximately half. Since it can be shortened, it has the effect of saving energy, and it also has the effect of reducing equipment costs compared to other varnishes.

[Brief explanation of the drawing]

The attached figure is a diagram showing the amount of curing a] added to the varnish and the drying time depending on the refrigerant treatment in 7-1.

Claims (1)

[Claims] In a refrigerator mode, an enamelled electric wire is wound inside the slot of the stator core, and the enameled electric wire is treated with a bisphenol-type epoxy resin and a phenol resin having an epoxy equivalent of about 300 to 1000 g/eq, an aromatic solvent, and an alcohol-based solution. 1. A method for treating a coil of a mode for a refrigerator, characterized in that the coil is treated with a solvent-type fest formed by dissolving it in a mixed solvent and mixing imidazole.