JPS593819A - Insulating material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an insulating material used in combination with a water-soluble insulating board.

[Technical background of the invention]

Since the water-soluble insulating film contains water, dimethylethanol and amine as solvent components, if it is used directly with, for example, a polyester film, it will be hydrolyzed during curing of the water-soluble insulating film.

Chemical changes such as crystallization and chemical decomposition occur, resulting in deterioration of the properties of polyester films, etc. Therefore, the insulating materials used in combination with conventional water-soluble insulation panels are hydrolysis resistant and chemical resistant.

It is said that insulating materials such as heat-resistant aramid paper with excellent solvent resistance or a combination of it and other materials, tyrimide film alone, or a combination of it and other materials are applicable. These can also be sufficiently applied as type 2 insulation.

However, each of the above insulating materials is (a) expensive and not easy to obtain, and (b) when actually used as core slot insulators in rotating electric machines, for example, polyester film is preferable for class F insulation due to price reasons. It is thought that an insulating material with a base material and heat-resistant aramid paper laminated as a protective material on both sides or one side of the base material can generally be used. In addition to the reduction in area ratio, heat-resistant aramid paper laminated on both sides or one side has poor durability, and especially when laminated on one side, the laminated state may become distorted! There have been problems such as extremely poor mechanical insertion workability due to the occurrence of cracks.

[Object of the Invention] The present invention has a simple structure using inexpensive and easily available materials, and can effectively prevent characteristic deterioration when used in combination with a water-soluble insulating varnish, and is fully applicable to class F insulation. The purpose is to provide an insulating material that can

[Summary of the invention]

The characteristics of the present invention are that a polyester film is used as a basic material, that is, a base material, and that both or one side of the film does not deteriorate in properties against solvent components such as water and dimethylethanolamine contained in water-soluble insulating varnish, and has heat resistance. F in terms of
A laminated structure is created by pasting a tetrafluorinated ethylene resin film that is fully compatible with seed insulation and has excellent slipperiness on the surface, protecting the base material from chemical effects and preventing oxidative deterioration, which is the main cause of thermal deterioration. In contrast, it prevents exposure to oxygen, improves machine insertability, and does not cause any deterioration in the properties of the polyester film that is the base material even when used in combination with water-soluble insulating varnish, and can be applied to class F insulation. It's about doing.

[Embodiments of the invention]

FIG. 1 shows the configuration of an embodiment of the present invention.

The one shown in Figure 1 is 0.075mn+ ~0.350w
A base material 1 made of a polyester film with a thickness of
This is an insulating material 3 having a three-layer structure by laminating a protective material 2 made of a polytetrafluoroethylene resin film with a thickness of 0.100 m.

The base material 1 of the insulating material of this embodiment is a polyester film. This material, that is, polyester film, cannot be used alone as a type 1 insulator, and when it is used in combination with a water-soluble insulating varnish, the solvent components such as water and dimethyl ethanol, which are contained in the varnish, Chemical changes such as cracking, hydrolysis, and crystallization occur depending on the combination of drying temperature and drying time during varnish curing, and under practical conditions, the tensile strength is approximately 50% or less, as shown in characteristic A of the test results shown in Figure 2. This results in a decrease in flexibility and a decrease in flexibility, and when the skin layer is bent, cracks occur at a depth of approximately 0.02 van, which poses a practical problem. In contrast, in this example, 0.01 or more tetrafluoride ethylene, which is fully compatible with F-class insulation and has excellent hydrolysis resistance and chemical resistance, is applied to both sides of the polyester film base material 1. By laminating and integrating the protective material 2 made of a resin film with an adhesive or the like, the influence of the chemical action when combined with the water-soluble insulating varnish described above can be reduced. It has been confirmed that the base material 1 is protected by being blocked by the light, and the deterioration of the characteristics of the base material 1 is significantly improved as shown in characteristic B in FIG. Also,
By doing this, thermal deterioration of the υ base material 1 can be prevented.
Since the supply of oxygen is cut off by the protective material 2, which is a polytetrafluoroethylene resin film with excellent heat resistance attached to both sides, the elongation property shown in Figure 3 is compared to property C of polyester alone. As shown in the characteristics, thermal deterioration mainly caused by oxidative deterioration was significantly suppressed, and heat resistance was improved by 15 to 25° C., making it fully suitable for Class F insulation as an insulating material.

Furthermore, the tetrafluorinated ethylene resin film protective material 2 laminated on both sides has good surface slip properties and high end tear resistance, so the mechanical insertion work as a slot insulator into the core slot is easier than using a single polyester film. It is as easy to work with as it is or even easier to work with, and is significantly improved compared to the conventional laminated insulation material of heat-resistant aramid paper and polyester film.

This three-layer insulating material 1 has all the mechanical properties such as tensile strength during use, tear resistance, electrical properties such as dielectric strength, and strength for work compared to the polyester film that is the base material 1. As mentioned above, the tetrabutylated ethylene resin film of the protective material 2, which is laminated on both sides, is used in combination with a water-soluble insulating phenol for protection from chemical effects.

This suppresses thermal deterioration, mainly caused by oxidative deterioration, and improves mechanical insertability by improving the surface toughness of the insulating material. Therefore, the thickness of the polyester film that is the base material 1 is approximately 0.07 mm in order to satisfy each of the above-mentioned characteristics.
A thickness of 5 mm to 0.350+ nm is required, and the thickness of the tetrabutylated ethylene resin film used as the protective material 2 to be combined with this is approximately 0.01 (below about 1 W+, chemical effects due to the combination with water-soluble phenol) are required. The protective effect and thermal deterioration suppressing effect of the insulating material 3 are significantly reduced, and if the thickness exceeds 0.100 m+, the insulating material 3 may be too thick due to the combination with the thickness required for the polyester film of the base material 1. When applied to slot insulators in electrical equipment, the space factor within the slot (the ratio of the cross-sectional area of the conductor to the cross-sectional area of the slot 4N+) will be significantly reduced, so the thickness combination as shown in this example is optimal. It is.

Note that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without changing the gist thereof.

For example, since the protective material 2 may be provided on the surface that comes into contact with the water-soluble insulating phenol during use, it may be provided on only one side of the base material 1 instead of on both sides, depending on how it is used.

Furthermore, the thicknesses of the polyester film base material 1 and the polytetrafluoroethylene resin film protective material 2 are within the ranges shown in the above embodiments, which are optimal and basic for general applications such as slot insulators for rotating electric machines. The point is that the protective material 2 only needs to block the chemical action of the water-soluble pheno, suppress the thermal deterioration mainly caused by oxidative deterioration of the base material 1, and have the desired properties as a whole. The thickness relationship can be appropriately adjusted depending on the purpose of use without being limited to the range.

Further, in the above embodiments, the case where the present invention is applied to the winding of a rotating electric machine is mentioned, but the present invention can also be applied to type 1 insulation in general electrical equipment such as transformers and electromagnetic switches with the same purpose.

〔Effect of the invention〕

According to the present invention, a sp polyester film is used as a base material as an insulating material applied to class F insulation in combination with a water-soluble insulating phenol, and water, dimethylethanolamine, etc. contained as a solvent in the above-mentioned water-soluble insulating phenol, etc. The combination of drying temperature and time after varnish treatment causes hydrolysis,
A polytetrafluoroethylene resin film that prevents chemical effects such as crystallization, improves heat resistance, suppresses oxidative deterioration, which is the main cause of thermal deterioration, and has excellent surface slipperiness, is used as a protective material on the base material. By integrally bonding, it is possible to provide an insulating material that is not affected by the chemical action of the polyester film as the base material, is compatible with class F insulation, and is easily available in cheap prints.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an insulating moon according to an embodiment of the present invention, and FIG.
FIG. 3 and FIG. 3 are test result characteristic diagrams for explaining the operation of the same embodiment. 1... Base material made of polyester film, 2...
Protective material made of tetrafluoroethylene resin film, mutual...
·Insulating material. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 2 Figure 3

Claims (1)

[Scope of Claims] (1) In an insulating material used in combination with a water-soluble insulating panel, a polyester film is used as a base material and a protective material made of a polytetrafluoroethylene resin film is attached to at least one surface of the base material. An insulating material characterized by having a laminated structure. (2. In the insulation material according to claim 1, the protective material is adhered to the base material using an adhesive. (3) Claim 1 The insulating material according to claim 1, wherein the protective material is adhered to the base material by welding. (4) The insulation according to any one of claims 1 to 3. In the insulation material, the protective material tetrafluoroethylene resin film has a thickness of approximately 0.010 mm to 0.100 m+*. (5) In the insulation material according to claim 4,
The base polyester film has a thickness of approximately 0.075mm ~
An insulating material characterized by having a thickness of 0.350 mm.