JPS62158310A - Heat-resistant insulated coil - Google Patents

Abstract

PURPOSE:To obtain a heat-resistant insulated coil which generates no crack in an impregnant hardened material by impregnating and hardening the impregnant obtained by kneading polyester denatured silicon resin and natural mica powder and by diluting it with an organic solvent in a coil wound with an insulated wire. CONSTITUTION:An insulated coil is obtained by impregnating and hardening in a winding 1 an impregnant 5 obtained by kneading polyester denatured silicon resin, methyl silicon resin or methyl phenyl silicon resin, a resin consisting of C, H, O, N elements and having a compatible or common solvent with a silicon resin and powder of natural mica and by diluting with an organic solvent. If used in a high temperature atmosphere of beyond 300 deg.C, an organic material is thermally decomposed and appropriate voids are formed in the impregnated and hardened material. This makes the modulus of elasticity of the impregnant hardened material smaller and no crack is generated in the impregnant hardened material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is particularly applicable to wire wheels of rotating machines, etc.
This paper relates to heat-resistant insulation for wire wheels used in high-quality atmospheres.

[Prior art] The wire ring of a conventional rotating machine has an insulation sheet made mainly of natural mica powder installed along the slot surface in which the wire wheel is housed, and an insulated wire is wound around the wire. After that, in an impregnating agent that is mixed with silicone resin and natural mica powder and diluted to 2 to 1 with an organic solvent, natural mica powder has relatively large scale diameters of 44 μm or less and larger scales. In the invention, the impregnating agent is impregnated with natural mica powder having a relatively large scale diameter, so that the impregnated and cured product is impregnated with 501% or more of the material. , by forming a layered arrangement of the scales, dispersing the stress received from temperature changes and mechanical S- during equipment operation,
This had the effect of making it difficult for cracks to occur in the impregnated cured product.

However, since the above-mentioned impregnated cured product uses a straight silicone resin as the vehicle silicone resin, it has an A of 300 to 450°C. When used in an atmosphere of M, when the organic matter is thermally decomposed and destroyed, the proportion of polysilomylsane contained in the impregnated cured product is high, resulting in an impregnated cured product with a high modulus of elasticity.

For this reason, the internal stress in the impregnated cured product increases due to thermal strain caused by temperature changes during operation and stop of equipment, and in addition, the stress received from mechanical vibrations during operation can cause cracks to occur in the impregnated cured product. However, it had the disadvantage of lowering its dielectric strength due to completely loosening of the ninth winding and damage to the insulation.

[Purpose of the invention]

The present invention eliminates these conventional drawbacks, maintains the adhesion of the winding wire without causing cracks in the impregnated cured product even in a high-temperature atmosphere, and provides heat-resistant and insulated wire without reducing dielectric strength. The purpose is to provide a circle of support.

[Structure of the invention]

The gist of the present invention is that a wire wound with an insulated wire is kneaded with polyester-modified silicone resin and natural mica powder, diluted with an organic solvent, impregnated with an impregnating agent, and cured.
More specifically, a so-called polyester-modified silicone resin that is modified with 50 to 20% gold polyester resin per unit weight of methyl silicone resin Matahata methyl phenyl silicone resin is added to a wire ring around which insulated wire is wound. min 50-30%, natural mica powder scale diameter 44
50-25 mt% for fine particles of less than x m, scale diameter 5
Natural mica powder 3 containing 0μm or more'150g1i% or more
Knead 5 to 15% by weight and add an appropriate amount! In place of the FC dipping agent diluted with a solvent, or the polyester-modified silicone resin, methyl silicone resin or methyl silicone resin can be used.
Phenylsilicone: 50 to 80% precious resin,
Is it compatible with the silicone resin or is it a common solvent? have, c.

Resin consisting of H, O, N elements and'! 50-20%
This electrical equipment coil is characterized in that it is completely impregnated and cured with an impregnating agent that has been blended.

[Specific description of the invention] The present invention will be described in further detail below.

In the present invention, as the silicone resin of the impregnating agent, in particular, methyl silicone resin or methyl 7-enyl resin is modified with 50 to 30 coul% t polyester resin per unit Xt. The so-called polyester-modified silicone resin or methyl silicone resin is methyl phenyl silicone resin.
) 50 to 20% of a resin consisting of C0H60 and N elements, which is compatible with the silicone resin or has a common solvent. Blend 50~30% of resin into M1, scale diameter 44μ
Natural mica powder of 50 to 25 Nfll-%, natural mica powder of 50 μm or more to 1.0 m or less in scale diameter, 35 to i
An insulated wire ring is obtained by impregnating and hardening the winding wire with the impregnating agent obtained by mixing the mixture in a proportion of 5"Xm%, kneading it in a Zeel mill, etc., and diluting it with an appropriate amount of an organic solvent.

Such an impregnating agent contains 50 to 20 ft% of polyester resin.
Is the added polyester-modified silicone resin, the straight silicone resin, compatible with the silicone resin, or is it a common solvent? have%C,H,0,
Since the impregnating agent is blended with a resin consisting of the N element, when heated at a high temperature of 300°C or higher or used in a high temperature atmosphere of 300°C or higher, the rate at which the impregnating agent loses organic matter due to thermal decomposition is low. is larger than those using conventional methyl silicone resin or methyl phenyl silicone at lIe'.

When we look at the impregnated cured product microscopically, we see that many tiny voids are formed inside it, even in conventional straight silicone resin metalworking.

Therefore, the modulus of elasticity of the impregnated cured product is smaller than that of a conventional straight silicone resin used as a vehicle.

The impregnated cured product undergoes thermal strain due to the differences in thermal expansion coefficients of the conductor, insulating material, iron core, etc. that make up the winding m during warm changes when the equipment starts and stops, and internal stress is generated.
As mentioned above, since the modulus of elasticity is small, the generated internal stress is small and does not cause cracks in the impregnated cured product.

〔Example〕

An example will be described in which a winding modeled after a rotating machine winding is treated with an impregnating agent and heated at a high temperature.

(Example 1) As shown in Fig. 1 and Fig. 2, a double-stranded glass-wound copper wire with a double cross-section of glass fiber was wound around a Ni-plated copper wire with a diameter of 1.01. The glass winding weight is placed inside the groove of the iron core 2 with glass cloth pasted on both sides with no adhesive, and the mica sheet 3 is placed in the groove insulation and bonded with an inorganic adhesive. Mica's Web 41tli made a model coil fc.

This is heated at 120℃ in advance to remove moisture from each material,
After cooling to about 40°C, polyester-modified silicone resin (solid content 50%), in which 40% of methyl/7-enyl silicone resin was modified with polyester resin, was added. g%,
Natural mica powder with a scale diameter of 44 μm or less 40@g%, natural mica powder with a scale diameter of 50 μm or more to 1.0 am or less (Mamabe Mica Co., Ltd. J: [)FL-'2) 2G electric power% , kneaded in a goal mill, immersed in an impregnating agent diluted with xylene for 10 minutes, and then air-dried (for i-1 hours, followed by heat drying for 2 hours at 80°C and 2 hours at 120°C, and then Heat curing was performed at 200° C. for 2 hours to obtain an insulated coil.

(Example?) A model coil similar to Example 1 above was created, and methylphenyl silicone resin (Shin-Etsu Chemical (a) 11i!: KR-282) was applied to it as a straight silicone resin.
) and polyester resin ((a:) manufactured by Nippon Polyurethane Industries, Niporan 404 (1?11 [ratio TIGO: 30 Zubvn FJ, Tomoki 11J 457 amount'Ah Rin flakes 4
Natural mica powder below μm 40% electricity.

Scale diameter 50 μm or more ~ 1. An impregnating agent containing 15 ft% of natural mica powder (manufactured by Sekibe 1 Ka (&l): DR-2) of less than Otm, kneaded in a goal mill, and diluted with xylene.
-What was obtained was subjected to the same impregnation treatment as in Example 1 to obtain an insulated wire.

The insulated wires of Example 1 and Example 2 obtained in this manner were heated in a constant temperature bath at 400°C, taken out to room temperature every 300 hours, and shaken with IG at room temperature for 11 hours. This is 1rao
After repeated heating for oo hours, the external appearance was inspected and the dielectric breakdown voltage to ground was measured. Table 1 shows a comparison with conventional products.

Even after heating the insulated wire rings of the present invention at 400° C. for 3000 hours, no cracks were observed in the impregnated cured product, and no decrease in dielectric strength was observed.

〔Effect of the invention〕

As described above, the present invention uses a polyester-modified silicone resin as the resin component of the impregnating agent, or C0H in addition to the silicone resin as the resin component of the impregnating agent.

Since we use resin consisting only of 0 and N elements, 300
When heated at a high temperature of .degree. C. or higher or used in a high-temperature atmosphere of 300.degree.

For this reason, the elastic modulus of the impregnated cured product is small, which reduces thermal stress from thermal strain caused by temperature changes such as when equipment is started and stopped, and allows for sufficient adhesion of the % winding without causing cracks in the impregnated cured product. Therefore, it is possible to provide an excellent insulated wire ring without damaging the insulation against mechanical vibration during operation of the equipment.

In addition, in the examples of the present invention, methyl phenyl silicone resin (modified with polyester resin) was used as the modified silicone resin, but methyl silicone resin was modified with polyester resin (n modified resin), and methyl phenyl silicone resin was modified with polyester resin. For resins, methyl silicone resins are modified with alkyd resins and epoxy resins, and methyl phenyl silicone resins are blends of silicone resins and other resins.
A similar effect can be obtained by using an alkyd resin or an epoxy resin.

Note that the application of these impregnating agents is not limited to rotating machine windings, but can be used for insulating electrical equipment windings such as transformers. The impregnation is not limited to immersion, but may also be done by immersion or molding.

[Brief explanation of drawings]

Figure 1 is a plan view of an embodiment of the present invention, and Figure 2 is A of Figure 1.
- It is an entry line sectional view. Destruction...Double glass winding 2...Iron core 3...Laminated mica sheet 4...Web 5...Impregnant Patent applicant Yasuyo Denki Seisakusho Co., Ltd. 1111. ::
Figure 1 Figure 2

Claims (2)

[Claims] (1) A heat-resistant insulated wire, which is characterized in that a wire wound with an insulated wire is impregnated with an impregnating agent prepared by kneading a polyester-modified silicone resin and natural mica powder and diluted with an organic solvent to harden the wire. (2) A silicone resin, a resin consisting of C, H, O, and N elements that are compatible with silicone resin or have a common solvent, and natural mica powder are kneaded into a wire ring around which insulated wire is wound. , a heat-resistant insulated wire that is impregnated and hardened with an impregnating agent diluted with an organic solvent.