JPS6011540B2 - Manufacturing method for wire rings for electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a wire rod used in, for example, a rotating electrical machine or a transformer, and in particular, a part or almost the entire electric wire rod is supported on the wire insulation. This invention relates to improvements in the manufacturing method of such wire wheels.

Generally, the cross-sectional configuration of a wire rod having a complicated curved shape, such as the end portion of a stator wire rod for a large-capacity superconducting generator, and its support are shown in FIG.
That is, the main insulation 7 is applied to the conductor 8 to form an insulated conductor 10, and a plurality of these insulated conductors 10 are inserted into the slot of the wire theory support member 1 via the guide baser 2, the sole 3, etc. made of an insulator. It is housed and held in 11. At this time, in order to prevent these insulated conductors 10 from falling off the wire theory support member 1, they are directly adhered to the guide baser 2, the sole 3, etc. Note that the guide base 2 and the sole 3 are fixed to the linear support member 1. However, with this configuration, in the case of a large-capacity insulated conductor, the movement of the conductor 8 in the cross direction and the direction perpendicular to it due to electromagnetic force and thermal expansion is large, so the main insulating layer 7 is There is a risk that the insulated conductors 10 will suffer damage such as tearing due to friction between them. For this reason, in general, the insulated conductor 10 of each turn is fixed to the adjacent insulated conductor 10 and the wire support section 1, but is allowed to move freely to some extent. In other words, the main insulating layer 7 is not directly fixed to the support portion, and the main insulating layer 7 is made to follow the conductor 8 relatively easily. With this, the effect of friction exerted by the conductor 8 on the main insulation 7 due to expansion and contraction of the conductor 8 is reduced. Moreover, the influence on the main insulating layer 7 due to friction between the insulated conductors 10 is eliminated. The following structure is generally adopted so that the main insulating layer 7 follows the movement of the conductor 8. That is, as shown in FIG. 2, a U-shaped insulating liner layer 4 is provided on the outermost layer of the insulated conductor 10, with a peeling layer 5 interposed therebetween and an opening toward the slot entrance. In this case, the liner layer 4 is bonded to each turn, that is, to each insulated conductor 10, to the above-mentioned guide baser 2, bottom lining 3, etc. so as not to peel off from the support portion. Note that the guide spacer 2, sole 3, etc. are bonded and fixed to the wire support member 1. The line theory constructed in this way can move freely within its movement range each turn for the following reasons. This is because the wire loops slide between the insulating liner layer 4 and the main insulating layer 7 via the release layer 5. By the way, in the line theory having the insulating liner layer 4 as described above, the following two methods are generally considered as methods for providing the insulating liner 4 in the line theory.

One method is to mold the liner in advance using a Western-style mold prepared separately and attach it. The other method is to cut out a liner from a thin plate, make it into a liner that is easy to bend, and attach it to the insulated conductor 10 while applying it to the liner. However, these two methods are possible if the overall shape of the insulated conductor 10 is simple, but it is not possible for wires that have a curved and complicated shape, such as the end of a stator wire of a rotating electric machine. , it is a very difficult task to match the curved shape, and there are cases where it is impossible depending on line theory.
In other words, when installing a mold manufactured by the former casting mold, a mold must be made to match the complex shape of the insulated conductor 10, and the manufacturing cost of the Western-style mold is comparatively low compared to the manufacturing cost of the insulating liner 4. This makes it extremely expensive. Furthermore, depending on the shape of the insulated conductor 10, it may not be possible to cover it with the completed insulating liner 4. In the case of the other method of cutting out a thin plate and applying it, if the thin plate does not have sufficient elasticity and elasticity, it is necessary to make it closely follow the curved surface of the insulated conductor 10. Moreover, there is a dislike that a lot of time is spent on this alignment work. Furthermore, if this thin plate is somewhat hard, the dimensional accuracy when assembling and arranging the line theory every evening may deteriorate. Furthermore, corners may form in some places, which may support local stress concentration on the main insulation 7 and lead to damage. In view of the above points, the present invention provides an insulated liner that closely follows the shape of an insulated conductor, even if it has a complicated shape, using a simple method that does not require casting molds or fitting operations. The purpose of this work was to provide a method for manufacturing wires for electrical equipment.

The present invention involves winding tape-shaped insulation around the exterior of the main insulation layer via a release material, and then removing one side of the wound tape-shaped insulation on the slot opening side to form a U-shaped insulation live. This is a method of manufacturing wire theory for electrical equipment, characterized in that the wire theory is made to press.

With this method, the liner layer is made integrally with the insulated conductor by taping, and then the slot entrance side of the liner layer is cut out, so the work is simple and the insulated liner fits well into the shape of the insulated conductor. There will be no problems in constructing line theory due to mismatches.
This makes it easy to obtain a wiring system for electrical equipment having a U-shaped insulating liner. Note that the reason why the insulating liner is U-shaped is to alleviate the influence of not only the force in the vertical direction but also the force in the direction perpendicular to the axis due to electromagnetic force acting on the insulated conductor. An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the structure of a wire ring for electrical equipment in the process of being manufactured. As is clear from this figure, the main insulating layer 7 is first wound around the conductor 8 to form the insulated conductor 10. Next, a tape such as tetrafluoroethylene film having a release effect from resin is wound around the outer periphery of the insulated conductor 10. As a result, a peeling layer 13 having a friction coefficient of 4.0, high slip properties, and elasticity is formed. Subsequently, a tape made of aromatic polyamide paper with excellent abrasion resistance and adhesion to resin is wound around the outer circumference of this release layer 13.
A base layer 12 of insulating liner layer is formed. That is, this layer 12 and the peeling layer 13 are integrally formed by winding in accordance with the winding formation of the main insulating layer 7. The liner having the basic layer 12 of these liners as the outermost layer has an inter-column smoother 9 inserted between it and the same liner made by winding in the same way to adjust minute dimensions. It is stored in the slot 11 of the support member 1.

After storage, the following work is performed. That is, a part of the release layer 13 facing the opening side of the wire support member 1 and a part of the base layer 12 of the liner are cut off to form the liner layer 4 and the release layer 5. FIG. 2 shows the state after this cutting. After being brought into the state shown in the figure, the entire structure is treated with resin. As a result, the shape of the main insulating layer 7 was well followed. A wire ring for electrical equipment having the U-shaped insulating liner 4 as the outermost layer is completed.
Although one example has been described above, this process does not always have to be carried out. For example, the resin treatment may be performed on the base layer 12 of the liner before storing the linear support member 1, as shown in FIG. Perform this on each wire wound around the
Thereafter, as shown in FIG. 1 above, the inter-row spacers 9 may be placed in between and stored in the ring support village 1.

Needless to say, after the storage is completed, part of the release layer 13 and base layer liner 12 are cut off as in the case described above. In this case,. Insulating liner layer 4
Adhering to the guide spacer 2, sole 3, etc., and fixing these to the wire support member 1 are performed after storage. Furthermore, the temporary patch plate 6 shown in FIGS. 1 and 4 is used to remove a portion of the release layer 13 of the basic layer 12 of the liner.
It is rolled up to prevent damage to the main insulating layer 7 and to make it easy to cut out, and is therefore removed after being cut out. As mentioned above, the present invention
The tape-shaped insulation was wound around the exterior of the main insulation layer via a release material, and then one side of the wound tape-shaped insulation on the slot opening side was removed to form a U-shaped liner. A wire ring for electrical equipment having a U-shaped insulating liner that closely follows the shape of an insulated conductor having a complicated shape can be easily obtained.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a longitudinal sectional side view of an electric wire ring showing one step of the manufacturing method of the present invention, and Fig. 2 is a longitudinal sectional side view showing the state after completion of the electric wire theory. . Figure 3 is a vertical side view showing another conventional electric wire ring;
The figure is a vertical sectional side view of an electric wire system alone, showing a manufacturing method according to another embodiment of the present invention. 1... Line wheel support member,
2... Guides base, 3... Sole lining, 4...
Insulating liner, 5...Peeling layer, 6...Temporary patch plate, 7...
Main insulating layer, 8... Conductor, 9... Inter-column spacer,
10... Insulated conductor, 11... Line theory support village slot, 12... Basic layer of liner, 1
3...Peeling layer. Figure 1 Tsutomu Figure 2 Inferior Figure Figure 4

Claims (1)

[Claims] 1. A wire ring for electrical equipment in which main insulation is applied to a conductor, a U-shaped insulation liner layer is applied to the outer periphery of the main insulation layer via a peeling layer, and the wire ring is housed and fixed in a slot of a support member. In the manufacturing method, when forming the U-shaped insulation liner, a tape-shaped insulation is wound around the exterior of the main insulation layer via a release material, and then one side of the wound tape-shaped insulation on the slot opening side 1. A method for producing a wire ring for electrical equipment, characterized in that a U-shaped liner is formed by removing the liner.