JPH0142486B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to electrical equipment windings, and in particular, when a water-soluble insulating varnish is used as an insulating varnish treatment applied to a winding portion, a solvent contained in the varnish is used. It concerns electrical equipment windings that take into account the chemical effects (hydrolysis, crystallization, etc.) that occur due to the combination of minutes, drying temperature, and time.

[Technical background of the invention]

Conventionally, in a rotating electrical machine in which randomly wound windings are housed in an iron core slot, an example of this is shown in FIG. Almost U
A slot insulator 3 in the shape of a letter is provided, and a randomly wound winding 4 made of a synthetic resin enamelled wire such as a polyester wire is housed in the slot insulator 3, and a cross-section of a polyester film or the like is also placed over the slot insulator 3. An insulating wedge 5 formed into a substantially arc shape is driven to fix the winding 4 and insulate it from the iron core 1.

The winding 4 constructed in this manner is formed into the inside of the slot 2 and a winding (not shown) by dipping or drip impregnation with a polyester insulating varnish containing an organic solvent such as toluene, xylene, or styrene. The wire end portions are impregnated with a thermosetting resin 6, and heated and cured to form an integrally fixed structure.

In the above-mentioned insulation structure, since the insulation materials of the wire and the sheet-like insulation are both made of polyester resin as a basic material, for example, water-soluble insulation varnish contains water, dimethylethanolamine, etc. as a solvent component. When impregnated with resin and heated to harden, polyester wires and polyester films undergo chemical changes such as hydrolysis and crystallization due to the combination of the above-mentioned solvent components, heating temperature, and time, resulting in significant breakdown voltage in polyester wires. Tensile strength of polyester film decreases.
There was a problem that the conventional insulation structure could not be used in combination with water-soluble insulation varnish, such as a decrease of more than 50%.

[Purpose of the invention]

The present invention provides electrical equipment windings that can use water-soluble insulating varnish and obtain good characteristics without causing problems due to chemical effects such as hydrolysis and crystallization of the insulating material caused by combination with water-soluble insulating varnish. The purpose is to provide a line.

[Summary of the invention]

The feature of the present invention is that the polyester film base material with a thickness of approximately 0.075 mm to 0.350 mm is used as the ground insulator and interphase insulator of the winding part.
The insulation material has a laminated structure with a polypropylene film protective material of mm and the thickness is approximately 0.075 mm ~
Approximately thick on 0.350mm polyester film base material
Synthesis that uses at least one of the insulating materials and has excellent hydrolysis resistance, chemical resistance, and solvent resistance as a winding material, with a 0.025 to 0.075 mm polyester film protective material pasted with adhesive to form a laminated structure. The winding wire is constructed using a resin enamelled wire, which is impregnated with a water-soluble insulating varnish and cured by heating, thereby making it possible to obtain sufficient characteristics even though the water-soluble insulating varnish is used.

[Embodiments of the invention]

FIG. 2 shows a cross section of a slot portion of an embodiment of the present invention. In this case, it is shown in Figure 3.
The insulating material 7 has a three-layer lamination structure in which a polyester film with a thickness of 0.075 mm to 0.350 mm is used as the base material 71, and a polypropylene film protective material 72 with a thickness of 0.010 mm to 0.060 mm is pasted on both sides of the base material 71. A slot insulator 8 made of a substantially U-shaped cross section is provided in the slot 2. A winding 9 made of a synthetic resin enamelled wire having excellent hydrolysis resistance, chemical resistance, solvent resistance, etc., such as a polyesteramide-imide wire, an esterimide wire, or a hot type polyester wire, is provided within the slot insulator 8. In this case, ``sac'' is an abbreviation for tris(2-hydroxyethyl) isocyanate. Furthermore, the term "seikku type" refers to the use of the aforementioned seikku in conjunction with another component. For example, when a polyester wire is produced by a reaction between the aforementioned seikku and a polyhydric carboxylic acid that is another component, it is referred to as a seishu type polyester wire. Furthermore, an insulating wedge 10 formed by forming the three-layer insulating material 7 into a substantially circular cross section is driven in to fix the winding 9 and provide insulation between the iron core 1 and the water-soluble insulating material 7. The inside of the slot 2 and the ends of the winding are impregnated with the thermosetting resin 11 by immersion treatment with varnish, and the resin is heated and cured at a drying temperature of 130°C to 160°C, and the winding is fixed together. Complete.

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, electrical properties such as dielectric strength, etc. of the base material 71 of 0.075 mm. Although it depends on the polyester film with a thickness of ~0.350 mm, when this material alone is combined with a water-soluble insulating varnish, the strength characteristics A shown in Figure 5 are obtained.
As shown in the figure, properties are significantly deteriorated due to chemical effects such as hydrolysis and crystal ratio caused by a combination of water contained in the varnish, solvent content such as dimethylethanolamine, drying temperature and time, etc. By laminating the protective material 72 of polypropylene film with a thickness of 0.010 mm to 0.060 mm with excellent chemical resistance and blocking the chemical action of the solvent, the deterioration of the characteristics as shown in characteristic B shown in Fig. 5 can be prevented. It was confirmed through experiments that this was significantly improved.

Since the winding wire 9 is exposed to the same conditions as the slot insulator 8, polyester wire cannot be used, but as mentioned above, amide-imide wire or ester-imide wire, which has excellent hydrolysis resistance, chemical resistance, organic solvent resistance, etc., can be used. Commercially available synthetic resin enamelled wires such as wires can be used.

Insulating materials that can be used in combination with water-soluble insulating varnish as slot insulators and interphase insulators include:
Conventionally, heat-resistant aramid paper alone or laminated materials of it and other materials have been known, but there are problems in using these because they are extremely expensive and not easily available. Moreover, for example, an insulating material with a three-layer structure in which the above-mentioned heat-resistant aramid paper is laminated on both sides of a polyester film, which is not an example of this embodiment, can be considered. The space factor (the ratio of the cross-sectional area of the winding to the cross-sectional area of the slot) deteriorates, and other problems arise, such as difficulty in mechanically inserting the wire.

Therefore, the insulating structure in the slot shown in this example has characteristics that differ when used in combination with water-soluble insulating varnish.
It can be said that it is optimal in terms of cost.

It should be noted 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, in the above embodiment, the polyester film base material 71 has a thickness of 0.075 mm to 0.350 mm and a thickness of 0.010 mm to 0.010 mm.
The slot insulator 8 and the insulating wedge 10 made of the insulating material 7 with a 0.060 mm polypropylene film protective material 72 attached thereto are used, but as shown in FIG. A base material 121 made of a polyester film with a thickness of
The slot insulator and the insulating wedge may be constituted by the insulating material 12 having a laminated structure with a protective material 123 also made of polyester film having a thickness of 0.025 mm to 0.075 mm, and this insulating material 12 and the above-mentioned Insulating materials 7 may be used in combination. This insulation material 1
2 protects the base material 121 from chemical action by a layer of a protective material 123 and an adhesive 122.

It goes without saying that these insulating materials 7 and 12 are used not only for slot insulators and insulating wedges, but also for ground-to-ground insulators used in windings and all interphase insulators that come into contact with water-soluble insulating varnish. .

Furthermore, depending on the type of equipment to which these insulating materials 7 and 12 are applied and how they are used, the water-soluble insulating varnish may come into contact with only one side of the insulating materials, and the protective materials 72 and 123 are 121
The same effect can be expected with a two-layer insulating material attached only to one side. Further, the above-mentioned effects can be obtained if the thicknesses of the base material and the protective material generally satisfy the above-mentioned conditions.

Furthermore, although the above description has been made using a rotating electrical winding as an example of an applied device, it can also be applied to transformer windings, control device windings, etc. with the same polarity.

〔Effect of the invention〕

According to the present invention, as the insulation structure of the electrical equipment winding, a polyester film is used as the base material as the ground-to-ground insulation and the phase-to-phase insulation, and the solvent in the varnish is prevented from coming into direct contact with the polyester film, and the solvent and the drying material are By using an insulating material with a protective material such as polypropylene film attached to block the chemical effects that occur due to the combination of temperature and time, in combination with a water-soluble insulating varnish containing water, dimethylethanolamine, etc. as a solvent, the characteristics It is possible to provide an electrical equipment winding that has good characteristics without any deterioration in performance, is inexpensive, and is easy to manufacture.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a slot showing the configuration of a conventional device, FIG. 2 is a sectional view of a slot showing the configuration of an embodiment of the present invention, FIG. 3 is a sectional view of an insulating material used in the same embodiment, and FIG. The figure is a sectional view showing an insulating material used in another embodiment of the present invention, and FIG. 5 is a characteristic diagram for explaining the effects of the present invention. 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,
An insulating material with a laminated structure made by pasting a polypropylene film protective material with a thickness of approximately 0.010mm to 0.060mm on a polyester film base material with a thickness of approximately 0.075mm to 0.350mm, and a polyester film with a thickness of approximately 0.075mm to 0.350mm. Film base material thickness approximately 0.025mm to 0.075mm
Synthetic resin enameled wire with excellent hydrolysis resistance, chemical resistance, and solvent resistance, using at least one of the insulating materials and having a laminated structure by pasting the polyester film protective material with an adhesive, and as a winding material. An electrical equipment winding characterized in that the winding is constructed using a water-soluble insulating varnish, which is impregnated with a water-soluble insulating varnish and cured by heating. 2. The electrical device winding according to claim 1, characterized in that a polyester amide-imide wire is used as the winding material of the winding portion. 3. The electrical device winding according to claim 1, characterized in that an esterimide wire is used as the winding material of the winding portion. 4. The electrical device winding according to claim 1, characterized in that a sealed polyester wire is used as the winding material of the winding portion.