JPS61227658A - Manufacture of electric coil - Google Patents

Abstract

PURPOSE:To improve electric and heat dissipating characteristics by adhering powder resin which contains 30% or more of mica powder to an insulating layer wound with a glass tape except a filling port, and then fully impregnating synthetic resin through the port. CONSTITUTION:After insulated wires 1 of the prescribed number are aligned and formed in the prescribed shape, an insulating tape 2 is wound. Then, mica powder filling powder paint in which 30wt% or more of mica powder is mixed is coated except a filling port 4 of impregnating resin to form a mica powder filling powder coating layer 5. Then, synthetic resin is impregnated in vacuum. The impregnated synthetic resin is not externllay flowed out nor leaked since the layer 5 is formed as a tough containerlike coating, to harden the synthetic resin impregnated to an electric coil in the impregnated shape as it is.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides an insulation treatment method C for preventing leakage of the impregnated resin material by completely impregnating the electric wire wheels C2 and C2 of electrical equipment.
It is related to

[Technical background of the invention and its problems] Conventionally, an insulation treatment method for manufacturing electric wires for electrical equipment has been based on the following procedure. That is, after forming an insulating layer on the conductor surface of the electric coil (e.g. Nigaras # & fiber tape, etc.), this is placed in an impregnating container 1, and the above insulating layer is impregnated with a resin to which a hardening agent has been added under vacuum. Then, the resin and the curing agent are usually bisphenol A-based epoxy resin, an acid anhydride-based curing agent, and a curing accelerator such as a tertiary amine.

By the way, the above-mentioned method for insulating electric wire rings is as follows (;
There are drawbacks as mentioned above. That is, after impregnating the insulating layer (Y) on the surface of the conductor of the electric wire ring with resin, the resin is There was a problem that the C2 leakage or leakage occurred before the C2 was completely cured.
:The reason why the resin flows out or leaks out during the heat curing process is due to the temperature rise of 5 units during heat curing of thermosetting resins such as epoxy resins, which are conventionally used as impregnating resins. This is because the resin has a viscosity characteristic that lowers its viscosity, and this was inevitable and unavoidable.

However, when such outflow or leakage of the C-impregnated resin occurs, it not only becomes difficult to form a prescribed insulating layer, but also voids are generated inside the insulating field, which deteriorates electrical properties including corona properties. However, the heat dissipation characteristics are also significantly degraded, making it impossible to mount it on electrical equipment.

Therefore, the following method can be considered to resolve this problem.

(1) How to select resin.

(a) Curing accelerator (bisphenol A-based epoxy resin ζ
In addition, a large amount of tertiary amine, imidazole, etc.) is added to extremely accelerate the curing reaction after impregnation, thereby preventing the resin from flowing out. However, in this method, the curing reaction of the resin remaining in the impregnated container after impregnation also progresses, so that the resin cannot be used effectively due to so-called increase, and if the curing accelerator exceeds the specified amount, the electrical properties of the insulating layer may be affected. This is not a preferred method because the strength of the cord will deteriorate.

(b) Heat-melt and impregnate a high viscosity resin (similar to bisphenol A, but with a large molecular weight and solid at room temperature), and prevent outflow and leakage of the resin after impregnation as much as possible. However, in this method, if the resin is made to have such a high viscosity that it becomes difficult to flow out or leak, it will also be difficult to impregnate the electric wire ring, which is the object to be impregnated, and the feasibility is poor.

(2) Method using a container (-) Like casting (: 1 unit of the material to be impregnated is placed in a mold, the center C of the mold is impregnated with the impregnating resin under vacuum, and after curing by heating Remove the mold. However, this method requires a mold that fits the object to be impregnated (:
Therefore, there is a drawback that the number of pieces produced is limited.

(b) Outermost layer C of the insulating layer: A face is applied leaving a resin injection port, and the whole is impregnated using this as a container. However, this method has the disadvantage that the fiberglass itself also penetrates into the insulating layer and impedes the impregnating resin into the insulation layer, so that all properties including electrical properties are affected by the characteristics of the fiberglass.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a method for manufacturing an electric wire wheel that improves electrical characteristics and heat dissipation characteristics.

[Summary of the Invention] A method for manufacturing an electric wire ring in which a conductor is wound, the outermost part (nigarasu tape is wound, and then the whole is impregnated with synthetic resin), the filling amount of mica powder is 30%. The above powdered resin is attached to an insulating layer (excluding the injection port) wrapped with glass tape, and then the entire synthetic resin is impregnated through the injection port to prevent the synthetic resin from flowing out or coming out. Let it harden (
It's something I did.

[Embodiments of the Invention] Hereinafter, an embodiment of the method for manufacturing an electric wire according to the present invention will be described with reference to FIGS. 1 and 2. First, the insulated wires 1 are arranged in a predetermined number and formed into a predetermined shape in the same way as in the conventional method (-) and then the insulating tape 2 is wound around them. At this time, it is most preferable to wind the glass tape 3 as the outermost layer. Next (Yu) Apply the nine mica powder-filled powder coating prepared in advance leaving the injection port 4 for the impregnated resin to form the mica powder-filled powder coating layer 5.Here, the mica powder-filled powder coating is , Epicote 10
0 (product name of Shell Oil Co., Ltd.) xoo, 1 ict
150 parts by weight of 1003 (trade name of Shell Oil Co., Ltd.) is heated and melted, and 150 parts by weight of mica powder having a nominal mesh size of about 200 mesh per unit is mixed and kneaded. After this, spread it thinly, cool it, and lightly crush it. Next (-, 2.5ii parts of dicyandiamide,
Imidazole 0. l! The mixture is melted by heating C (parts by weight), and after sufficiently dissolving, the mica-containing pulverized material is mixed in and thoroughly stirred. Immediately after stirring (second cooling and then pulverization), the pulverization should be approximately 100 to 300 mesh for electrostatic coating, and coarser than this for fluidized dipping.

Further, for masking the inlet 4 of the impregnated resin, a normal masking material may be used, and a normal electrostatic coating machine may be used.

In addition, when using a belt conveyor, if the surface of the belt conveyor that comes into contact with the frame (the surface to which powder does not adhere during painting) is used as the injection port 4, it will be possible to avoid the use of special masking material. Good too.

After forming the mica powder-filled powder coating layer 5 by electrostatic coating, a strong support is formed by directly heating the coating at 180°C for 30 minutes. This means that the applied powder coating filled with mica powder hardly flows out during heating and curing. In other words, the texture of the outermost layer of glass tape 3 (: the clogged mica powder-filled powder coating is
No more flow inside 5: during heat curing. This is because the leveling called general C-powder paint is very bad, and it hardens in the same shape as it was applied.
1).

After curing as described above, the resin material is impregnated with the synthetic resin material described below under vacuum. As this synthetic resin material, an epoxy-based material is preferable, but other materials may be used as long as they can maintain predetermined characteristics as an electric wire. For example, Epicoat 828 (trade name of Shell Oil Co., Ltd.), acid anhydride curing agent HN2200 (trade name of Hitachi Chemical Co., Ltd.), and imidazole 100:
A mixture with a mixing ratio of 80:2 may be impregnated (or strained).

The synthetic resin impregnated in this manner (Y) has a carbon
Even if the viscosity decreases, the mica powder-filled powder coating layer 5 forms a strong container-like support.
There is no outflow or leakage to the outside, and the impregnated synthetic resin can be cured in the same shape as it was impregnated.For reference, in general, synthetic resins are It is said that it is desirable to gel at a low temperature and then harden at a high temperature.The above-mentioned container-shaped coating is strong, so there is no risk of leakage or leakage to the outside even if the viscosity decreases. Therefore, it can be slowly cured over time.

Example 1 As a field winding of a DC motor, a double glass-wound insulated wire was wound 150 times around a winding form C of 200 x 350 x 150 (unit M), and then the winding form was removed and the outer device: 0.2
Wrap a glass tape of 5 thickness and 25 width (unit thin) twice in a double layered manner, and this outer C unit has a thickness of 0.13 and is 19#! (Unit: L) without glass tape, wrapped in 2 layers and bound on the outermost layer. This was preheated and dried at 150° C. for 30 minutes, and a mica powder-filled powder coating was applied electrostatically. The mica powder-filled powder coating used here was Epicoat 1001: Ebikoat 1003: 20 mesh mica powder rainbow cyandiamide: imidazole = 100: 15022.5:
These were kneaded at a weight ratio of 0.1. Then, after electrostatic coating, heating at 180℃ for 20-30 minutes to form a support, TVB2703 (trade name of Toshiba Chemical Corporation)
was impregnated under vacuum. Thereafter, the mixture was slowly gelled at 120°C for 3 hours, and then post-cured at 180°C for 15 hours.

In this case, the weight after post-curing was measured and it was confirmed that there was almost no difference in weight and that there was no outflow or leakage of the impregnated resin.

Example 2 Exactly the same as Example 1, only using mica powder-filled powder coating, Epicor) 1001: Ebicoat 1003: 20
Mica powder Nidicyandiamide: Imidazole=
Zoo: 150: 250: 2.5:
Electrostatic coating was performed under the same conditions using the mixture kneaded at a weight ratio of 0.1.

In this case, the thickness of the powder coated layer filled with mica powder could be increased by about 10 inches, and a more complete seal could be achieved.

[Effects of the Invention] Since the present invention is configured as described above, the impregnated resin does not flow out or leak, and the electrical properties and heat dissipation properties can be improved.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of the method for manufacturing an electric wire according to the present invention (-a perspective view showing a related electric wire; FIG. 2 is a person-A shown in FIG. 1).
FIG. 2 is a cross-sectional view taken along a line and viewed in the direction of the arrow. 1... Insulated wire 2... Insulating tape 3...
Glass tape 4...Inlet 5...Mica powder filled powder layer

Claims (1)

[Claims] In a method for manufacturing an electric wire ring, in which a conductor is wound, a glass tape is wound around the outermost part of the conductor, and the entire surface is then completely impregnated with a synthetic resin, a powder resin containing 30% or more of mica powder is added to the glass. A method for manufacturing an electric wire ring, characterized in that a tape is attached to a wound insulating layer except for an injection hole, and then the synthetic resin is completely impregnated through the injection hole.