JPH0142485B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to electrical equipment windings that are compatible with class F insulation, and in particular, as an insulating varnish treatment applied to the winding portions,
This paper relates to electrical equipment windings that take into consideration the chemical effects (hydrolysis, crystallization, etc.) that occur due to the combination of the solvent content in the varnish, drying temperature, and time when a water-soluble insulating varnish is used.

[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 class F insulation will be described. As shown in FIG. 1, a semi-closed slot 2 of an iron core 1 has an approximately U-shaped cross section made of an insulating material such as heat-resistant aramid paper or a polyester film with heat-resistant aramid paper laminated on both or one side. A slot insulator 3 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 or the like is placed over this. An insulating wedge 5 having a substantially arcuate cross section is driven in to fix the winding 4.
Insulate between it and iron core 1.

The winding 4 constructed in this manner is thermally hardened 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. It is impregnated with a synthetic resin 6 and cured by heating 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 thick, which leads to poor slot space factor (ratio of the cross-sectional area of the winding to the cross-sectional area of the slot) in terms of equipment design, as well as poor surface slipperiness. In the case of a single-sided laminated structure, there was a problem in that the machine insertion workability was extremely poor due to bending (warpage).

[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 combined with a water-soluble insulating varnish, and can obtain good characteristics using a water-soluble insulating varnish. The purpose is to provide electrical equipment windings that are compatible with

[Summary of the invention]

The feature of the present invention is that the thickness of the winding part as the ground insulator and the interphase insulator is approximately 0.075 mm or more.
Approximately thick on 0.350mm polyester film base material
A synthetic resin enamel with excellent hydrolysis resistance, chemical resistance, and solvent resistance as a winding material, using an insulating material with a laminated structure by pasting a 0.010 mm to 0.100 mm tetrafluoroethylene resin film protective material. The winding is constructed using wire, impregnated with a water-soluble insulating varnish, and cured by heating.It is possible to obtain sufficient characteristics even with the use of a water-soluble insulating varnish, and is also compatible with class F insulation. It's about trying to get it.

[Embodiments of the invention]

FIG. 2 shows a cross section of the slot portion of one embodiment of the present invention. In this case, it is shown in Figure 3.
A base material 71 is a polyester film with a thickness of 0.075 mm to 0.350 mm, and a protective material 72 made of a polytetrafluoroethylene resin film with a thickness of 0.010 mm to 0.100 mm is attached to both sides of the base material 71 to form a three-layer laminated structure. insulation material 7
A slot insulator 8 is provided in the slot 2, and is formed by forming a substantially U-shaped cross section. Inside this slot insulator 8, a winding 9 is provided which is made of a synthetic resin enamelled wire having excellent hydrolysis resistance, chemical resistance, solvent resistance, etc., such as esterimide wire, amideimide wire, and hot type polyester wire. In this case, ``sac'' is an abbreviation for tris(2-hydroxyethyl) isocyanate. Furthermore, the term "stable type" refers to the use of the above-mentioned sac in combination with another component. For example, when a polyester wire is produced by a reaction between the sac and another component, ie, a polyhydric carboxylic acid, it is referred to as a sac-type polyester wire. Further, an insulating wedge 10 formed by forming the insulating material 7 into a substantially arc-shaped cross section is driven to fix the winding 9 and insulate the core 1, and then is subjected to immersion impregnation with a water-soluble insulating varnish. The inside of the slot 2 and the ends of the winding are impregnated with thermosetting resin 11, and the winding is completed by heating and curing at a drying temperature of 130 DEG C. to 160 DEG C. and fixing them together.

The slot insulator 8 made of the three-layer insulating material 7 used in this example has mechanical properties such as tensile strength and end tear resistance, and electrical properties such as dielectric strength of the base material 71.
It depends on the polyester film with a thickness of 0.075mm to 0.350mm, and when combined with a water-soluble insulating varnish, it is caused by the combination of the water contained in the varnish, the solvent content such as dimethylethanolamine, and the drying temperature and time. Chemical actions such as hydrolysis and crystallization are the base material 71
0.010mm laminated on both sides of the base material 71
The base material 71 can be protected from deterioration in its characteristics by being protected by the protective material 72 made of tetrafluoroethylene resin film having a thickness of ~0.100 mm. In other words, polyester film cannot be used alone as a Class F insulator, and if it is used in combination with a water-soluble insulating varnish, water, dimethylethanolamine, etc. contained in the varnish will undergo chemical changes, and it will not work under practical conditions. The test results show that the tensile strength is approximately 50 as shown in Figure 4.
% or less and the epidermis layer is approximately
Whereas wall cracks occur at a depth of 0.02 mm, which poses a practical problem, in this example, it was confirmed that the deterioration of the properties of the base material 71 was significantly improved as shown in property B in Fig. 4. It was done. Regarding heat resistance, the heat resistance is F.
Thermal deterioration is suppressed by blocking the supply of oxygen to the base material 71 (taking note that the main cause of thermal deterioration is oxidative deterioration) using the protective material 72 that has characteristics compatible with seed insulation. do. In other words, with respect to thermal deterioration, as shown in the test results shown in FIG. 5, compared to characteristic C of polyester alone, according to this example, thermal deterioration is significantly suppressed and heat resistance is improved as shown in characteristic D.
It was confirmed that the properties were improved by 15 to 25 degrees and that the properties were sufficiently suitable for Class F insulation as Insulating Material 7. Therefore, when this insulating material 7 is used in combination with a water-soluble insulating varnish, the deterioration in properties due to the influence of chemical effects due to the combination of the solvent content in the varnish, drying temperature, and time is significantly improved, and it can also be used as class F insulation. In addition to being applicable, the significantly improved slipperiness of the surface of the insulating material provides mechanical insertability equivalent to or better than when polyester film alone is used.

In other words, the winding insulation structure shown in this example can be said to be optimal in terms of characteristics and cost when combined with a water-soluble insulating varnish. As long as the value of is satisfied as described above, 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 used in windings and interphase insulators, if any, that come into contact with the water-soluble insulating varnish. 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 varnish may come into contact with only one side of the insulating material. A similar effect can be expected with a two-layer insulating material.

Moreover, although the rotating electrical machine windings have been described above as an example of applied equipment, the present invention can also be similarly applied to transformer windings and controller windings.

〔Effect of the invention〕

According to the present invention, the water-soluble insulating varnish and the F-type insulation structure of the electrical equipment winding include a polyester film as the base material as the ground insulator and the interphase insulator, and the solvent in the varnish directly contacts this. By using an insulating material attached with a tetrafluoroethylene resin film protective material to prevent this and to block chemical effects such as hydrolysis and crystallization that occur due to the combination of this solvent, drying temperature, and time, When used in combination with a water-soluble insulating varnish containing water, dimethylethanolamine, etc. as a solvent, there is no deterioration in properties and good properties are obtained, and because the insulating material is a protective material, the base material does not come into direct contact with air. , oxidative deterioration, which is the main cause of thermal deterioration, is suppressed, it is compatible with F-class insulation, and the slipperiness of the surface is significantly improved. We have created electrical equipment windings with Class F insulation that is as easy to perform as or better than using a single film as an insulating material, and is inexpensive and easy to manufacture without degrading properties when combined with water-soluble insulating varnish. can be provided.

[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 shows the insulating material used in the embodiment. Cross-sectional views shown in Figures 4 and 5.
The figure is a characteristic diagram for explaining the effects of the same embodiment. 1... Iron core, 2... Slot, 8... Slot insulator, 9... Winding wire, 10... Insulating wedge, 11...
Thermosetting resin.

Claims (1)

[Claims] 1. As an insulator between windings and between phases,
The insulating material has a laminated structure by pasting a polytetrafluoroethylene resin film protective material with a thickness of approximately 0.010 mm to 0.100 mm on a polyester film base material with a thickness of approximately 0.075 mm to 0.350 mm, and is durable as a winding material. An electric device winding characterized in that the winding is constructed using a synthetic resin enamelled wire with excellent hydrolyzability, chemical resistance, and solvent resistance, and the winding is impregnated with a water-soluble insulating varnish and hardened by heating. 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 enamelled wire is a polyesteramide-imide wire. 4. The electrical equipment winding according to claim 1, wherein the synthetic resin enamelled wire is a transparent type polyester wire.