JPS58212349A - Insulating method for rotary electric machine coil - Google Patents

Abstract

PURPOSE:To sufficiently immerse a rotary electric machine coil with resin and to enable to insulate the coil in high quality inexpensively by discontinuously bonding and fixing the end of a flat winding insulating sheet longitudinally with bonding material such as an adhesive or adhesive tape or the like. CONSTITUTION:Conductors 1 wound on a plurality of drums 11 are elongated via levels 2 made of rollers 12, bundled, insulating sheets 3 are simultaneously fed to an enclosing unit, the conductors 1 are enclosed longitudinally with the sheet 3, an adhesive 6 such as polyester hot melt or the like having excellent heat resistance with bondability in a short time fed from a hot melt applicator 5 is bonded discontinuously to the superposed part of the sheets 3 in a longitudinal direction, pressed by a pressing roller 7, fixedly bonded, wound on a bobbin 13 in this state, and formed in a trapezoidal coil 8. In this manner, immersed resin can be readily introduced from the non-bonded part, thereby sufficiently immersing it with the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an insulation treatment method that facilitates resin impregnation treatment of a rotary electric machine coil having a conductor formed by flatly winding an insulation sheet.

[Technical background of the invention]

In 1,000-maki insulation (also called sushi-maki or double-maki insulation),
The edge of the insulating sheet surrounded along the length of the conductor is
Some kind of fixing or adhesion is required, and conventional methods include: (1) Wrapping an insulating sheet tightly with insulating tape made of another or the same material over the 1,000-roll insulation.

(2) A method of fixing by heat-sealing the folds of the insulation sheet.

(3) A method of continuously bonding and bonding the overlapped seams with an adhesive material such as adhesive tape or adhesive.

etc.

[Problems with background technology]

However, in the method (1) of winding the tape, the dimensions increase by the thickness of the tape, and when automated manufacturing is performed, the machine becomes complicated and costs increase. (2)
In the heat-sealing method (3) and the continuous bonding method (3), the overlaps of the insulating sheet block the resin injection during resin impregnation in the subsequent process, leaving unimpregnated areas. However, there was a problem that voids were created inside the insulator and the quality deteriorated.

[Purpose of the invention]

The present invention provides a method for insulating coils of rotating electric machines, which can perform 1,000-turn insulation while also sufficiently impregnating the resin, can easily be automated, and can provide high-quality, low-cost coil insulation. The purpose is to

[Summary of the invention]

In the present invention, the ends of the 1,000-roll insulation sheet are adhesively fixed discontinuously in the longitudinal direction with an adhesive member such as adhesive or adhesive tape, so that the impregnated resin can easily enter from the non-adhesive part. It also reduces the cost of automation equipment.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is an elevational view of an automated turn insulation device for hexagonal coils. The conductor (1) wound around a plurality of drums (only one is shown) is drawn and focused by each roller (1'!J), and is insulated ( 3) into the enveloping device at the same time, and the conductor (11) is covered with an insulating sheet (3).
) surrounded along the longitudinal direction by an insulating sheet (3)
The adhesive (6) fed from the hot melt applicator (5) is applied discontinuously in the longitudinal direction to the overlapped portions of the adhesive as shown in FIG. Then, in that state, wrap it around the winding form (13) and
A sea cucumber shaped wire ring (8) as shown in the figure is formed. The adhesion interval of the adhesive (6) varies depending on the configuration and dimensions of the conductor (1) or the feeding speed, but can be freely selected by an electric signal. In this example,
Adhesive (6) K uses a heat-resistant polyester hot melt (trade name sold by Sale Chilney Co., Ltd.) that can be bonded in a short time, but it is difficult to use solvent-type adhesives by installing a heating process. It is also possible to use adhesives or adhesives. The sea cucumber shaped wire ring (8) is then replaced with a tortoise shell shaped coil (
2), but before that, the straight part of the hexagonal coil (which will become one part) is heated and compressed to harden the dough. It is thought that the adhesion thickness of the adhesive (6) is important because it is thought that the adhesive (6) will flow out more and connect the discontinuously attached parts by 11 degrees.Experimental results: 50 to 10 degrees.
When the adhesion thickness was 0 μm, there was very little flow and the adhesion was good.

Next, the effect will be explained.

The resin-impregnated passage of 1,000 rolls of insulation is generally an insulation sheet (3)
The amount that passes through - is minute, and most of it is an insulating sheet (3)
It is said that the insulation sheet (3) is impregnated along the surface of the
If it is a polyimide or polyester film, it can be said that there is no penetration at all.

For example, if a porous film is used, some trays can be impregnated through the film, but there are limits to its use because the insulation properties, especially the breakdown voltage properties, deteriorate. Therefore, the present embodiment in which the bonding is discontinuous and the resin is impregnated from the non-bonded portions is expected to be extremely reliable in terms of characteristics. As an experimental example of its characteristics, as shown in Fig. 3, the 1,000-volume insulation of this example was fixed to an aluminum rhombosis (9) with discontinuous adhesive bonding, and the two insulators were bonded continuously using a conventional method. Figure 6 shows a comparison of the changes in capacitance when sealing both ends of one test ring and impregnating it with resin under vacuum pressure. The characteristics of the conventional continuous adhesive are already shown in the curve.As shown in Fig. 6, the curve a of this example is completely impregnated in a short time and the capacitance is saturated; In the conventional case, the capacitance was not completely impregnated and the capacitance did not reach saturation even after applying pressure for more than 5 hours.This clearly shows the superiority of this example. Since it is bonded, the cost of automation equipment is also low.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings. For example, as shown in FIG. You can also paste it. Also, the location of the paste is
It may be offset as shown in Fig. 8, or it may be placed in the center as shown in Fig. 9.Also, although not shown, the insulation of bare conductors and the main insulation of the coil may be of the 1,000-turn insulation type. It goes without saying that the invention can be modified and implemented in various ways without changing the gist of the invention.

〔Effect of the invention〕

As explained above, according to the present invention, the edges of flat-wound insulation sheets are adhesively fixed discontinuously in the longitudinal direction using an adhesive member, making it easier to enter the impregnated resin from the non-adhesive portions, and also automating the process. A method for insulating rotating electric machine coils that reduces equipment costs can be obtained.

[Brief explanation of drawings]

FIG. 1 is an elevational view showing an apparatus for carrying out an embodiment of the insulating treatment method for rotating electric machine coils of the present invention; FIG. 2 is an elevational view showing a sea cucumber-shaped coil manufactured by the apparatus shown in FIG. Figure 3 is an enlarged perspective view showing the state in which the coil shown in Figure 2 is insulated by 1,000 turns of conductor during the manufacturing process, and Figure 4 is a top view showing the state in which the coil shown in Figure 2 is formed into a tortoiseshell-shaped coil. , FIG. 5 is a cross-sectional view showing the test par, FIG. 6 is a curve diagram showing the resin impregnation characteristics of the test par, FIG. FIGS. 8 and 9 are cross-sectional views showing how adhesive members of other different embodiments are attached. 1... Conductor 3... Insulating sheet 6...
Adhesive 8... Sea cucumber shaped wire ring 14... Turtle shell shaped wire ring 17... Adhesive tape No. I Figure Ichishu Ifl (H)

Claims (1)

[Claims] In a method for insulating a rotating electrical machine coil in which a coil with 1,000 turns of insulation surrounding an insulating sheet is used as a conductor and is subsequently impregnated with heat-resistant resin under vacuum pressure, the ends of the 1,000 turns of insulation sheet are coated with adhesive or A method for insulating a rotating electric machine coil, characterized in that the coils are discontinuously adhesively fixed in the longitudinal direction using an adhesive member such as adhesive tape.