JPS60213237A - Coil of rotary electric machine - Google Patents

Abstract

PURPOSE:To obtain a resin-impregnated insulated coil having excellent coil insulating withstand strength and voltage application lifetime characteristic for a rotary electric machine by employing a mica-wound falt lead as a strand. CONSTITUTION:A mica tape is wound on a strand conductor 1, the outermost layer is formed by winding a strand having a mica insulating layer 6 so that the film surface is disposed at the outermost layer in a bobbin and formed in a hexagonal shape. Then, a prepreg sheet 7 which has a width size not exceeding the size of the strand row height size is inserted in the strand row longitudinal direction of the portion to become linear, and the linear portion is bonded by thermally molding between the strands. Then, it is formed in a hexagonal shape, and a main insulating layer 4 is formed by winding a mica sheet or a mica tape on the entire periphery of the coil. Subsequently, after impregnating resin is impregnated in vacuum under pressure, the resin is cured in a heating furnace. Thus, a coil which has bonding strength and high insulating withstand strength for a rotary electric machine can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a wound impregnated insulated coil used in a rotating machine.

[Technical background of the invention and its problems]

Coils for high-voltage rotating electric machines include cashier/rich insulated coils and vacuum pressurized impregnated insulated iφ coils depending on their manufacturing method, and the present invention relates to the latter. There are two types of coils: a hexagonal coil and a half-turn coil, and although this patent is applicable to both, the hexagonal coil will be mainly described here.

1U shell-shaped coil tit, a process of winding a thousand-sided coil with wire insulation into a shape V (a process of winding it a predetermined number of times, and a process of molding a bundle of wires in which the straight parts of the coil are bonded using a cloth to increase rigidity) , (The process of forming 3-shaped 1ζ, the process of winding mica chives and applying tamazetsu, and the fully impregnated insulation) composite PC
It is applied to a rotary α machine by a step of assembling it into the iron core slots t and i, and a step of impregnating the t'2V-containing i2 resin under pressure and heating and curing it.

In the conventional coil t', glass-wound wire, enameled wire, and glass-wound enameled wire are used as the wire insulation, and -
Also, the bare wire of the straight part of the coil! For adhesion, you can use a method of wrapping VC Gripreg glass tape around the body bundle, or a method of wrapping Karasu tape while applying varnish, or a method of wrapping Noripreg glass tape containing a large amount of cloth. (The method of heating and molding with VC sandwiched between f and the strands is adopted.

FIG. 1 shows an example of a conventional coil. 1 is a bare wire conductor, 2 is a wire insulator, 3 is a wire bundle glued by wrapping glass cloth while applying cloth to glue the cable bundle,
4 is the main insulating layer by winding mica tape, 5 is the low resistance I-
It comes out. Since the conventional coil has a rectangular shape as described above, the electric field is concentrated at its four corners, that is, the part A in the m1 diagram, and electrical Vζ breakdown often occurs in this part. That is, the bare wire d! 3 If an organic material or glass fiber with poor corona resistance and green yield strength is used as the edge 2 and the wire bundle adhesive layer 3 disposed thereon, +d can be easily removed from the corner of the rod 1.
An internal destruction path develops and progresses. Furthermore, if the strand bundle is wrapped with a glass tape or coated with glass tape to bind the strand bundle, varnish or glass cloth is applied to the corners of the strand bundle as shown in Fig. 13. Sometimes the corner is square, and this corner is the best A
& jvi If the thickness of 4 is not thin, it may cause a decrease in dielectric breakdown rolling pressure and shorten the life of section 4.

In addition, in order to determine the dielectric strength k + i'9 of the coil, we used a C71 force-rectangular wire as the strand, and used a strand of a strand of strand 2 like the one shown above.・； 、）j? If you use a person, there is a possibility that the infiltration of 1 (the surface of the ridgeline is wide) and 11 (the part is covered with varnish and the impregnation of the wire insulation) will be hindered and you will not be able to make a custom order. 1 between the cable lines
(: Hold υ1, convex 7-ru) Yes, 7J
11 When thermo-molded, VC Sonis flows and the gaps between the wires are filled with this cloth, so the impregnability is not the same.

[Invention]

The purpose is to provide coils for rotating electric machines.

[Part 1 of the Invention] In order to achieve the above object, two or more rows of rectangular wires having a mica layer on the outer periphery and a film layer on the outside thereof are used. A prepreg sheet is interposed between the rows of the wire bundles arranged in a row, and the wire bundles are heated and molded to solidify the wire bundles, and the grooves of the wire bundles are covered with vC micante or mica tebe and impregnated with liquid resin. The contact area between the cable wires should be minimized, and a gap should be provided at the corner of the adjacent strands to serve as a path for the impregnated resin, and the impregnability of the strand insulation and main insulation should be so that

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. A strand of wire is wound with maito tape, and the strand of wire having a mica insulating layer 6 with the film direction facing the outermost layer is rolled into a V-shaped winding 1, formed into a hexagonal shape, and then directly spun 1. Insert a prepreg node door with a width that does not exceed the height of the strand row in the vertical direction of the strand row in the part where it becomes 2, heat mold this part marked in figure 1, and turn the strand 1 to 1]. Glue. Next, the coil is formed into a hexagonal shape, and the main insulating layer 4 is applied around the entire circumference of the coil by winding mica/tape or mica tape. For complete impregnation, insert the above-mentioned coil into the core slot; otherwise, VC impregnates the impregnating resin with vacuum pressure using the coil alone. Next, the coil of the present invention is completed by curing the resin in a heating furnace. Here, the prepreg sheet 7 between the vertical layers is made of a material whose surface is smoother than that of glass cloth, such as a molecular film made of polyester, polyimide, etc.
Non-woven fabric, paper-like aromatic polyamide? + (DuPont's Nomex, Nippon Aroma's dA tissue, etc.), aromatic polyamide fibers, fibrid and glass fiber mixtures (Nippon Aroma's GA paper, GA board, etc.) as base materials, and epoxy Use something coated or impregnated with varnish etc. to make it into a Gripreg shape. Varnish application or varnish content,
As shown in FIG. 3, which shows the cross section of the coil after heating and molding the strands of strands held down to the minimum necessary for bonding the strands, even though the varnish 8 has flowed, there are still void grooves 9 between the corners of the strands. It is necessary to

To achieve this purpose, for example, if Nippon Aroma Co., Ltd.'s GA paper with a thickness of 0813 vn is used as the base material,
The solid content of the varnish relative to the entire prepreg sheet may be 60 to 80% by weight.

Next, the action of this rotating electric coil will be described.

First, the state of impregnation of the impregnated resin into the coil will be explained. The impregnated resin mainly penetrates the slits between the overlapped mica tapes and impregnates the inside of the main insulating layer 4. Assuming that the slit is a circular pipe, the flow rate Q of fluid passing through the circular pipe within a unit time is proportional to the fourth power of the diameter (Bois' second law)
. Therefore, in order to improve impregnability, it is desirable to ensure large pores on the I#i surface. On the other hand, when considering impregnation into a pattern-wound coil, it is difficult to wrap the mica tape perfectly tightly around the curved portion of the coil, so gaps are created between the mica tapes that allow the impregnating resin to easily pass through. In addition, there is a large gap in the lead wire of the hexagonal coil and the main insulating end of the half-turn coil, and the impregnated resin can easily penetrate into the strands. It is much easier to impregnate than other parts. In order to completely impregnate the entire coil with the impregnating resin within a reasonable time, it is necessary to effectively guide the resin impregnated into the strands of the coil end part to the strands of the straight part of the coil in a short period of time. is necessary.

As shown in FIG. 3, around the cable bundle of the straight part of the coil in this embodiment, there is a gap groove 9 between the VC mica insulation layer 6 and the prepreg sheet 7, and a gap between the corner of the wire and the main insulating layer 4. A wedge-shaped gap groove 10 is secured between the ends, and the resin impregnated in the coil end passes through the gap and is quickly transferred to the strand layer of the white wire of the coil, dramatically improving the coil strength compared to conventional coils. Impregnating properties are improved.

On the other hand, the contact 1 of the prepreg sheet 7 is as shown in FIG.
1-If the varnish 8 flows, the adhesion strength will be sufficient for the subsequent mica taping work of the main insulation.

In particular, in the present invention, since the surface of the wire is a film, sufficient adhesive strength can be achieved with a small amount of resin! I get caught. On the other hand, if glass cloth, polyester cloth, etc. are used as the base material for the prepreg sheet 7, the cloth will have coarse mesh, so as shown in FIG. When this occurs, parts such as voids 12 are not bonded, resulting in insufficient contact and strength of the strands. In addition, if the varnish content m'121- of the prepreg sheet is increased in order to have sufficient adhesive residue, the amount of varnish flowing out will be large, and the gap groove 9 will become extremely small, and the varnish will seep into between the upper and lower strands. As a result, the impregnating properties of the impregnating resin deteriorate. Therefore, it is necessary to use a material other than the above-mentioned textile as the base material of the prepreg sheet.

Garalu.

Further, according to this embodiment, angulation 9 due to resin, glass cloth, etc., which is undesirable for coil insulation, does not occur at the corner portion of the wire bundle, as shown in part B in FIG. 1.

In order to confirm that the impregnability of the coil of this example as described above is improved compared to the conventional coil, we used a hexagonal coil using a wire wrapped with mica tape four times to improve its impregnability. A comparative test was conducted. The strands and the main insulation are the same, and the strand bundle molding method uses a conventional coil in which a glass tape is wrapped around the strand bundle and a thin layer of varnish is brushed on. (B) A coil using the method of inserting a pre-preg cloth sheet containing 60% varnish into a pre-preg sheet (B);
'The coils of the 11th example are designated as (C1). These coils are subjected to vacuum application + f and impregnation at the same time using a 6-bore epoxy/register 7'(!"), and after pressurization, After some time, the coil was taken out, the insulating layer was cut open with a knife, and the resin was immersed in the a'4J state.The coil (C) was the main gun's Yuushi, Sobo 4, and the head's edge. C was impregnated. However, in Q, the mica tape on the inside 2 of the i)-1 QJ was not impregnated, and the mica tape on the inside of the main e and the coil (13)
In this case, the inner two layers of mica tape were unimpregnated J8. From this experiment, it is clear that the coil of the present invention has better impregnability than the conventional coil.

Next, the electrical characteristics of the conventional coil and the coil of the present invention were compared in terms of their training life. Various configurations can be considered for the conventional coil, but here, the bar coil is made of an enameled glass base line and all the cables, and is made using the same strand bundle molding method as the coil (5) above, and the main insulation is provided with mica tape VC. I used the one I made. This coil is denoted by (■)). The volume of the present invention used in this test also had a coil tel of the configuration (
A bar coil of the same length as the DJ was used. Number of samples is 7 each
The fCo coil (C) ltc is 13.4 kV/um, Coil/l/+1) I y by vacuum pressure impregnation under conditions that both coils are completely impregnated, and heat curing.
C applies a commercial frequency Ii field of 10.1 kV/ix,
The time required to destroy the bond (Section 1Ili, Juko) was determined.

The results are plotted into the real probability grid and shown in Figure 5.
oJ Mark to coil C1 7JD 'nj field is coil + Il
l Although it is 33 cm higher than V'c, the division is 66 cm.
is t and is equivalent to β. If the same mica insulation is used and the total IJ electric field is 33% l'r;), then from past test results, the energized life will be about 1/10.

If we apply the same electric field to both coils, then
The imposed lifespan of the coil of the present invention is approximately 1% compared to conventional coils.
It is estimated that it will be 0 times longer.

Furthermore, it can be seen from FIG. 5 that the variation in the life of the coil +C+ of the present invention is smaller than the variation in the conventional coil (Dl).

〔Effect of the invention〕

As explained above, according to the present invention, since the mica-wound rectangular 4,1 wire with a low dielectric strength is used as the strand, the life characteristics of the coil are affected by the dielectric strength of the coil.
We can provide moxibustion coils.

Revamping the long-lost Sogen Shichirudōden, and changing it to the vertical force of the Soko arrangement.
Zorigreg with the minimum amount of varnish applied/-
Since we adopted the method of inserting the 7III heat mold, there is no need for varnish to flow out around the V base. There is no angularity that affects the insulation properties VC rJ at the bundle corners. In this way, a gap groove for effectively applying the resin impregnated in the coil end part to the heel part of the coil IA is secured at the bare corner part VC, and the inner layer side of the main insulation and the conventional coil are impregnated. Since it is possible to completely impregnate the wire wrapped with mica tape with a VCb point, it is possible to provide a highly reliable rotating coil with small variations in the characteristics of B air bacteria. .

[Brief explanation of the drawing]

bl) Figure 1 is a side view of the 1-layer wire section l4J of a conventional coil, Figure 2 is a cross-sectional view of the ll'i line section of a coil according to an embodiment of the present invention, and Figure 3 is a side view of the ll'i line section of a coil according to an embodiment of the present invention. An enlarged W1 view of the 7 (- wire bundle mold part) at the wire part of one embodiment of Ij. 5L-4 is an enlarged view 117i of FIG. ■...4 cable wires, 4...main insulation, 5...low resistance) bad, 6
... Mica 7 is based on the old VC! @Zetsu i, i;, 7...
Grigreg/-1, 8...adhesive varnish, 9.10...void groove, 11...fiber such as crow. Agent Benj1. i Shi Nori Close:・△L Tsuma (and 16 others) Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 66 /θ0 2ζ0 40 6ρσ Charge + (b)

Claims (5)

[Claims] (1) Arrange the 14 glands in two or more rows and heat the mica layer and the film layer outside it at 7 degrees;
A prepreg sheet was interposed between the rows of wires, the wire bundle was heat-molded and fixed together, a mica sheet or mica tape was wound around the remains of the wire bundle, and the wire was impregnated with liquid resin and cured. Thing f: Characteristic coil of rotating electric machine. (2) The prepreg sheet is characterized in that it is made into a semi-cured state by attaching a face to a thin sheet material made of at least one of a polymer film, polymer fibers, polymer fibrids, or inorganic fibers. Scope of patent claims@paragraph 1 Rotating chamber (number of coils) →Se 1 (Nashita ↓ ■ Tsukasa (3) A coil for a rotating/electrical machine according to claim 2, wherein the thin sheet material is a mixture of at least one of aromatic polyamide fibers or fibrids and ultrafine glass fibers. (4) Fes is characterized by having an amount that does not fill the space at the corner of the strands when the bundle of strands is heated and does not infiltrate between directly adjacent strands. Patent 1. A coil for a rotating electric machine according to claim 2. (5) The coil for the rotating chamber 4M according to claim 3, wherein the amount of resin in the face in the prepreg sheet is 60 to 80% by weight.