JPS5963944A - Coil for electric device - Google Patents

Abstract

PURPOSE:To prevent the characteristic of a polyester film from decreasing by employing a composite insulator coated and seized with protective film of alumid resin on both side surfaces of polyester film base as a sheet-shaped insulator. CONSTITUTION:A polyester film having 0.075-0.35mm. thick is coated and seized at both side surfaces with alumid resin to form protective films and provided in a U-shaped slot insulator 7 in a half-opened slot 2 of a core. A coil 10 using synthetic resin enameled wire having excellent hydrate resistance, medicine resistance and solvent resistance is contained in the slot insulator 7. An insulator wedge 9 formed substantially in circular-arc shaped section is hitted into the film from above. Water soluble varnish 11 is dipped and immersed with the coil, cured and dried at approx. 140-150 deg.C to form an insulator structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to electrical equipment windings, and more particularly to electrical equipment windings that use water-soluble insulating varnish for insulation face treatment applied to the winding portions.

[Technical background of the invention]

Conventionally, when a random winding is housed in a stator core slot of a low-voltage rotating electric machine, an example of the n:f insulation is as shown in FIG. For example, a slot insulator 3 made of polyester film or the like and having a U-shaped cross section is provided, and a randomly wound winding 4 made of synthetic resin enamelled wire such as polyvarnished wire is placed inside this slot insulator 3. The coil 4 is housed, and an insulating wedge 5t made of polyester film or the like having a roughly arcuate cross section is driven in from above to fix the winding 4 and insulate between it and the iron core 1. The winding 1fB4 constructed in this manner is formed by dipping or dripping a polyester resin insulating face containing a suitable solvent such as toluene, xylene, or styrene into the inside of the slot 2 and the ends of the winding (not shown). The portion is impregnated with thermosetting resin 6 and fixed by heating and curing.

If the insulation fen treatment in such an insulation configuration is carried out by impregnation and heat curing treatment with a water-soluble insulating varnish containing water, butyl cellosolve, dimethyl ethanolamine, etc. as a solvent component, the above solvent components and heat curing temperature will be used for 1 hour. The combination causes chemical changes such as hydrolysis and crystallization in the polyester wire and polyester film, which are the constituent materials, resulting in a significant decrease in insulation function, which poses a serious problem in practical use.

As an example of countermeasures against this problem, polyamide film or aramid paper alone, or composite insulators made by laminating them with other materials, are used, which have excellent hydrolysis resistance, chemical resistance, and solvent resistance. .

However, such insulators are very expensive and
Another possibility is to combine aramid paper with another insulating material, such as a polyester film, but in this case, the thickness of the insulating material will increase, the space factor in the system slot will be poor, and the machine insertion work will be required. Problems such as poor workability arise.

[Purpose of the invention]

) The present invention reduces the limitations on the conditions for insulating varnish treatment of insulating materials that occur when used in combination with water-soluble insulating phenol, and improves quality and quality.
Electrical equipment volume + 1l that provides the optimal insulation configuration in terms of function and cost.
The purpose is to provide 111.

[Outline of the invention]

The feature of the present invention is that the sheet insulation between the winding part and the ground and between the phases has a thickness of approximately 0.075cm to 0.3cm.
0.005m thick on 50 fin polyester film base material
A composite insulating material coated with the above aramid resin retention film is used, and as a winding material, it has hydrolysis resistance, strong chemical resistance,
The winding wire was made of a synthetic resin enamelled wire with excellent solvent resistance, impregnated with water-soluble insulating phenol, and cured by heating (1-4 composition).

[Embodiments of the invention]

FIG. 2 shows a cross section of a slot portion of an embodiment of the present invention.

In this case, the cross section L is the U-shaped slot insulator 2.
As for the thickness of 0.075cm to 0.35m, 71mm is the best choice. A composite insulator is used in which a protective film is formed by coating and baking aramid resin with a thickness of 0.0050 or more on both sides of a Lieneter film as a base material. Alternatively, use a polyester film as the @ wire, that is, the magnet wire 10, for example, an ester imide wire, a polyester amide imide wire, or a safety tie f polyester wire (e.g. 1
80-NFL-200, manufactured by Schenectady, product name)
Blood in the throat] Uses synthetic resin enamelled wire with excellent hydrolyzability, strong chemical resistance, and solvent resistance. The winding portion is dipped and impregnated with water-soluble insulating varnish 11 to give a coating of 140 to 15
Cured and dried at 0°C J34″f: The applied insulation is also completed.

Next, the operation of such a configuration will be explained.

The changes in dielectric breakdown voltage and tensile strength characteristics due to drying temperature and drying time when poly, Nether wire, and polyester films, which are conventionally commonly used as materials for insulating jigs, are combined with water-soluble insulating phenol were investigated. The nests are shown in Figure 3 and Figure 4, respectively.

According to this, polyester wires undergo chemical deterioration under heating conditions, resulting in a significant drop in dielectric breakdown voltage regardless of drying conditions, which poses a practical problem.

In addition, for polyester film, the practical limit for drying temperature and time is 1, which is a factor of 50 of the initial tensile strength.
It is subject to conditions such as a temperature of 50°C or less and a time of 5 hours or less.

In this way, in winding insulation using the insulation structure and drying treatment method, by combining with water-soluble insulating phenol, the water, butyl cellosolve, dimethylethanolamine, etc. contained in phene can act singly or synergistically, and the temperature Depending on the type of material or drying conditions, the properties may deteriorate significantly, making it impossible to put it into practical use.

The present invention has the effect of suppressing the deterioration of characteristics due to this chemical effect to an extent that does not pose a practical problem and maintains the performance, and its effects will be explained using specific experimental examples.

The present invention uses a polyester film as the basic material, that is, the base material, for the sheet-like insulator used for slot insulators, etc., and as a means to suppress the deterioration of the properties of this base material, the base material is directly coated with water-soluble insulating varnish. A method is adopted to prevent chemical effects by preventing contact with
As a preservation material for this purpose, aramid resin, which has excellent chemical resistance, solvent resistance, etc. and high chemical stability, is applied and baked to form a peritoneal preservation membrane with a thickness of 0.005 mm or more on both sides of the base material. It is something. According to experiments, when this I material is combined with a water-soluble insulating varnish, the change in tensile strength properties is as shown in Figure 5. , the property deterioration can be maintained at a factor of 50 or less of the initial strength. It is possible to significantly improve the deterioration of properties of the ester film.

As mentioned above, by forming a protective film consisting of a chemically stable aramid resin coating on both sides of the polyester film that is the base material, the water-soluble insulation is This can be said to be due to the chemical action of the solvent components contained in the varnish being blocked. The thickness of the 7-lamid resin film on both sides should be 0.005m or more in terms of ease of application, uniformity of the coating, occurrence of pinholes, etc.
Within this range, the above-mentioned blocking effect can be sufficiently exhibited.

In addition, Figure 6 shows the results of an experiment in which ethylimide wire was used as the magnet wire used in the winding, and the characteristics changed when combined with a water-soluble insulating varnish under different drying conditions. At a temperature of , it can be said that no deterioration of properties occurs regardless of the length of drying time. Furthermore, it has been confirmed through experiments that the other two synthetic brittle enamels 1 exemplified above as magnet wires do not exhibit any deterioration in their properties.

From these points, it can be said that by using the insulation product of the wire and the sheet-shaped insulator in combination with the materials described above, no practical problems will arise when used in combination with a water-soluble insulating varnish.

This invention can be practiced with various modifications, such as applying the image retention film only to the surface, without changing its gist.

[Effects of the Invention] Kienori's varnish is free from hydrolysis and crystallization caused by drying conditions when used in combination with a water-soluble insulating varnish containing water, butyl cellosolve, zometerethanolamine, etc. as a solvent component. It is possible to provide an electrical equipment winding that can prevent chemical changes such as, etc., maintain its insulation function, and provide insulation that is sufficiently practical in terms of quality, performance, and price.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional core slot portion, and FIG. 2 is a sectional view of a core slot portion according to an embodiment of the present invention, g+i3
The figure shows the burst voltage characteristic diagram for the combination of water-soluble insulating varnish and polyester wire, Figure 4 shows the tensile strength characteristic diagram for the combination of water-soluble insulating varnish and polyester wire, and Figure 5 shows the water-soluble insulating varnish and the present invention. FIG. 6 is a diagram showing the tensile strength characteristics of a combination of sheet-like insulators to which the method is applied, and FIG. l...Iron core, 2...Iron core slot, 7...70-piece insulator, 9...Wedge, lO...Winding wire, 11...Zekkuwaninu O Applicant's agent Patent attorney Suzu E Takehiko Figure 1 Figure 2 [13Il [4th garden]

Claims (4)

[Claims] (1) As a sheet-like insulator between the winding part and the ground and between the phases, the thickness is approximately 0. A composite insulation material is used in which a protective film of aramid resin with a thickness of 0.005 mm or more is coated and baked on a polyester film base material of O75~0.350 aOn, and as a winding material, it has hydrolysis resistance, chemical resistance, and solvent resistance. The winding wire is made of synthetic resin enameled wire with excellent properties, impregnated with water-soluble insulating varnish, and cured by heating. (2) The electric device winding according to claim 1, wherein the synthetic resin enamelled wire is an esterimide wire. (3) What about synthetic resin enamelled wire? The electrical equipment winding according to item 1 of the scope of patent H%i, characterized in that it is a liennetelamideimide wire. (4) The electrical equipment winding according to claim 141, wherein the synthetic II B'M enameled wire is a tPJ-characteristic that it is a saic tyzopolyester wire.