JPS594002A - Winding for electrical machinery and apparatus - Google Patents

Abstract

PURPOSE:To obtain F class insulation easily by using a synthetic resin enamel wire, which is excellent in hydrolysis resistance, chemical resistance and solvent resistance, as a winding material, using an insulating material, in which a tetrafluoroethylene resin film of fixed thickness is pasted to a polyester film base material of fixed thickness as inter-ground and interphase insulators, impregnating water-soluble insulating varnish and curing the varnish. CONSTITUTION:A polyester film of 0.075-0.50mm. thickness is used as the base materal 71, and a protective agent 72 consisting of the tetrafluoroethylene resin film of 0.010-0.100mm. thickness is pasted to both surfaces of the polyester film, thus obtaining the insulating material 7. The insulating material is bent so that the section is formed to a U shape to form a slot insulator 8, the slot insulator is entered into a clot 2, the inside of the slot is filled with winding 9 consisting of the synthetic resin enamel wire such as an ester amide wire excellent in hydrolysis resistance, chemical resistance and solvent resistance, and an arcuate insulating wedge 10 is driven in to fix the winding. A thermo-setting resin 11 is impregnated, and cured at 130-160 deg.C.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to electrical equipment windings compatible with type 2 insulation.
When water-soluble insulating phenol is used as an insulating phenol treatment applied to the windings, it is necessary to consider the chemical effects (hydrolysis, crystallization, etc.) that occur due to the combination of the solvent contained in the phenol, drying temperature, and time. It concerns equipment windings.

[Technical background of the invention]

An example of a conventional winding structure for a rotating electric machine in which a randomly wound winding is housed in an iron core slot that is compatible with type 2 insulation will be described. As shown in Fig. 1, the cross section of the semi-closed slot 2 of the iron core 1 is U. A slot insulator 3 that removes the shape is provided, and a randomly wound winding 4 made of a synthetic resin enamelled wire such as an esterimide wire is housed in the slot insulator 3, and a heat-resistant aramid paper is placed over this. An insulating wedge 5 having a substantially arc-shaped cross section is driven in to fix the winding 4 and insulate it from the iron core 1.

The winding 4 constructed in this way is coated with a thermosetting resin inside the slot 2 and at the ends of the winding (not shown) by dipping and impregnating with a polyester insulating varnish containing an organic solvent such as toluene, xylene, or styrene. 6 is impregnated with heat and hardened to form an integrally fixed structure.

With the above-mentioned insulation structure, even if a water-soluble insulating varnish is used in combination, it will not be subjected to chemical effects due to the combination of water contained in the varnish, solvents such as dimethylethanolamine, and the drying temperature and time during varnish processing. In slot insulators with such a configuration, the insulation thickness becomes thicker, so the space factor in the slot (the ratio of the cross-sectional area of the winding to the cross-sectional area of the slot) becomes worse due to equipment design, and the surface slipperiness is poor. In the case of a single-sided laminated structure, there were problems such as bending and extremely poor mechanical insertion workability.

[Purpose of the invention]

The present invention does not cause problems due to chemical effects such as hydrolysis and crystallization of the insulating material that occur when used in combination with a water-soluble insulating varnish. The purpose is to provide electrical equipment windings that are also compatible with seed paper edges.

[Summary of the invention]

The features of the present invention include:
As an interphase insulator, the thickness is approximately 0.0.75 to 0.35
Thickness approximately 0.010 on 0a preester film base material
Synthetic resin with excellent hydrolysis resistance, chemical resistance, and solvent resistance for the winding part, using an insulating material with a laminated structure by pasting a tetrabutylated ethylene resin film protection system of a ~ 0.1001111 The winding is constructed using enameled wire, which is impregnated with water-soluble insulating varnish and cured by heating.It is possible to use water-soluble insulating varnish and still obtain sufficient characteristics, and it can also be used on the edges of F type paper. The reason is that we have made it compatible.

[Embodiments of the invention]

FIG. 2 shows a cross section of the slot portion of an embodiment of the present invention. In this case, 0.0751111 shown in FIG.
A polyester film with a thickness of 11 to 0.3501111 is used as the base material 71, and a polyester film of 0.010 mm to 0.10 mm is coated on both sides of the base material 71.
A slot insulator 8 formed by forming an insulating material 7 having a three-layer laminated structure with a protective material 72 made of a tetraethylene ethylene resin film having a thickness of 0 m+ and having a U-shaped cross section is inserted into the slot 2. Provided for. Inside this slot insulator 8, a winding 9 made of a synthetic resin enamelled wire having excellent hydrolysis resistance, chemical resistance, solvent resistance, etc., such as an ester imide wire, an amide imide wire, or a saic type polyester wire, is provided. Furthermore, an insulating wedge 10 formed by shaping the above-mentioned resuscitation material 7 into a roughly arcuate cross section is driven to secure the winding 9 and provide insulation between it and the iron core 1, and then coated with water-soluble insulating varnish. The inside of the slot 2 and the end portion of the winding are impregnated with the thermosetting resin 11 by immersion treatment at 130°C to 160°C.
The three-layered insulating material 7 used in this example is heated and cured at a drying temperature of ℃ to solidify and complete the winding part.
The slot insulator 8 has mechanical properties such as tensile strength and end tear resistance, electrical properties such as dielectric strength, etc. of the base material 71.
, 075wun ~ 0.350wm depending on the polyester film in thickness, and when combined with a water-soluble insulating varnish, hydration occurs due to the combination of water contained in the varnish, solvent content such as dimethylethanolamine, drying temperature and time. The base material 71 indicates that chemical actions such as decomposition and crystallization are applied to the base material 71.
0.010 mm to 0.10 mm laminated on both sides of. O
The base material 71 can be protected from deterioration in its characteristics by being protected by a protective material 72 made of a tetrafluorinated ethylene resin film having a thickness of tan. In other words, polyester film cannot be used alone as a Class F insulator, and when it is used in combination with a water-soluble insulating varnish, it causes chemical changes in the water, dimethylethanolamine, etc. contained in the varnish, making it difficult to use under practical conditions. The test results showed that the tensile strength decreased to about 50 inches or less, as shown in characteristic A shown in Figure 4, and when the skin layer was bent, a crack formed at a depth of about 002 fins, causing a practical problem. On the other hand, in this example, it was confirmed that the deterioration of the toughness of the base material 710 was significantly improved as shown in characteristic B in FIG. With regard to heat resistance, the protective old 72, whose heat resistance is compatible with class F insulation, is used to cut off the supply of oxygen to the profiteer 71 (focusing on the fact that the main cause of thermal deterioration is oxidative deterioration). Suppress thermal deterioration. In other words, with respect to thermal deterioration, as shown in the test results in Figure 5, compared to characteristic C of polyester alone, according to this example, thermal deterioration was significantly suppressed and heat resistance was improved as shown in characteristic C. It was confirmed that the insulating material 7 had characteristics that were improved by 15 to 25 degrees and were sufficiently suitable for Class F insulation. Therefore, when this insulating material 7 is used in combination with a water-soluble insulating phenol, the deterioration in properties due to the influence of chemical effects due to the combination of the solvent content in the phenol, dry storage temperature, and time can be significantly improved, and it can also be used as class F insulation. In addition to this, the slipperiness of the surface of the insulating material is significantly improved, making it possible to obtain mechanical insertability equivalent to or better than when using polyester film alone.

In other words, the winding insulation drawing shown in this example can be said to be optimal in terms of characteristics and cost when used in combination with water-soluble insulating phenol. As long as the value of 72 roughly satisfies the above-mentioned value, almost the same effect can be obtained even if there is a slight difference.

In addition, the above-mentioned insulating material 7 is not limited to slot insulators and insulating wedges, but can also be used for all ground-to-ground insulators and interphase insulators used in windings, if any, that come into contact with the water-soluble insulating phenol. Needless to say.

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, depending on the type of equipment used as an insulator and how it is used, the water-soluble insulating phenol may come into contact with only one side of the insulating material. A similar effect can be expected with an insulating material having a layered structure.

Further, in the above description, a rotating electric machine winding was described as an example of an applied device, but the present invention can also be similarly applied to a transformer winding and a controller winding.

〔Effect of the invention〕

According to the present invention, two types of water-soluble insulating phenol and electrical equipment winding are provided.
As a species insulation configuration, as an insulator to ground, as an insulator between phases,
A polyester film is used as a single material to prevent the solvent in the phenol from coming into direct contact with it, and to block chemical effects such as hydrolysis and crystallization that occur due to the combination of this solvent, drying temperature, and time. By using an insulating material to which an ethylene oxide resin film protective material is attached, good properties can be obtained without deterioration of properties when used in combination with water-soluble insulating phenol containing water, dimethylethanolamine, etc. as a solvent. Moreover, because the insulating material is protected by the protective material and the base material does not come into direct contact with air, oxidative deterioration, which is the main cause of thermal deterioration, is suppressed, making it compatible with Class F insulation, and significantly improving surface toughness. In the case of rotating electric machine windings, etc., mechanical insertion into the iron core slot is as easy as or even easier than using polyester film alone as an insulating material, and the combination with water-soluble insulating phenol It is possible to provide an electrical equipment winding with class F insulation that is inexpensive and easy to manufacture without deterioration.

[Brief explanation of drawings]

Fig. 1 is a slot sectional view showing the configuration of a conventional device, Fig. 2 is a slot sectional view of a rotating electric machine winding section showing the configuration of an embodiment of the present invention, and Fig. 3 is an insulating material used in the same embodiment. 4 and 5 are characteristic diagrams for explaining the effects of this embodiment. DESCRIPTION OF SYMBOLS 1... Iron core, 2... Slot, 8... Slot insulator, 9... Winding wire, 10... Insulating wedge, 11... Thermosetting resin. Applicant's agent Patent attorney Suzue Kanehiko No. 1 Figure 2 0 Figure 3 2

Claims (4)

[Claims] (1) As insulation between windings and between phases,
Using an insulating material with a laminated structure by pasting a tetrabutylated ethylene resin film protective wing with a thickness of approximately 6010 m to 0.100 fl to a polyester film base material with a thickness of approximately 0.075 to 0.350, and The winding is constructed using synthetic resin enamelled wire with excellent hydrolysis resistance, chemical resistance, and solvent resistance as the winding material, and this is impregnated with a water bath-proof varnish.
An electrical equipment winding characterized by being heat-cured. (2) The electrical device winding according to claim 1, wherein the synthetic resin enamelled wire is an esterimide wire. (3) The electrical equipment winding according to claim 1, wherein the synthetic resin enameled wire is a polyesteramide-imide wire. (4) The electrical equipment winding according to claim 1, wherein the synthetic resin enamelled wire is a safe type polyester wire.