JPH0453109A - Resin-molded coil - Google Patents

Abstract

PURPOSE:To avoid the degradation of processability of block coils by a method wherein a sleeve made of high strength fibers is impregnated with resin and the resin is cured and the sleeve is cut into square-U shaped coil holders which are fitted to the block coils. CONSTITUTION:Glass fibers 12 having diameters of 50-500mum are woven into a cylindrical shape and, after the woven fibers are impregnated with epoxy resin, the resin is heated and cured to form a square-cylindrical sleeve 11. The sleeve 11 having a height equal to the height h1 in the axial direction of a block coil 15 is cut into square- U shaped coil holders 13. A plurality of the square-U shaped coil holders 13 are fitted to the circumferences of block coils 15 which are composed of wound coil conductors 14 only and the block coils 15 are provided outside an inner core 17. At that time, the sleeves 11 are provided between the respective coil blocks 15 as insulating spacers 16 and the sleeves 11 are also provided between the respective block coils 15 and the inner core 17 as insulating spacers 18. After the respective block coils 15 are connected to each other electrically, an outer mold 20 is attached. After heating, casting resin 5 is cast by vacuum pressurized casting and, after the resin is heated and cured, the molded product is removed from the mold to obtain a unified resin- molded coil.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a resin molded coil in which a block coil divided into a plurality of pieces in the axial direction is integrally molded with resin.

(Prior Art) Conventional resin molded coils are often used in heavy electrical equipment such as molded transformers and molded transformers due to their excellent moisture resistance, dust resistance, and insulation properties. There are various methods of manufacturing resin molded coils, but generally a mold is used, and the coil is stored in the mold, and if the coil is made up of multiple block coils, it is called a block coil. A molding method is adopted in which a casting resin such as epoxy resin is injected into the gap or between the block coils while maintaining the dimensions at an appropriate distance, and is heated and hardened to form an integral molded coil. In this case, the coil itself is divided into a plurality of block coils in the axial direction for better insulation, and the block coils are electrically connected to form an electromagnetic coil for one phase, which is then The method used is to store it in a mold and mold it with resin. However, in order to maintain the distance between block coils or between the mold and block coils, insulation 2 with dimensions that match the distance is required.
ノ、Pacer is required ３、Handling of insulation board ζ
So, this insulating surface →J is the weak point.) (After the casting resin hardens, there may be peeling at the boundary between the picture edge surface →J and the casting resin J-, or there may be clicks in the resin.) There was a risk of insulation breakdown and leakage.

11 The conventional resin coil is explained with reference to FIG. 8. As shown in FIG. -l
Continuously wind the coil conductor 5 body 2.

31) O, Y, (C) via insulating spacer 4: 1.
Build up the battery and electrically connect it to form one electromagnetic coil.
, 1. ""r" 1, Pro Tsuk: yil 3 is 71
At the time of winding, it is attached to the winding machine to form a 1Jt)'' non-jima pattern. Because
5th) Figure 11;, 6', J, the block coil 3 is fixed with adhesive 4 - f7, in this case, instead of the sticky tube 7 (, The entire block coil may be wrapped with glass tape, etc.

Block coils 3a, 3b and 3 configured in this way
Cover the area around c with 1, Yoshi 4-type resin: Matame ζ 2
, When storing 6 in the mold that is not centered, the gold edge, )-74 Il and P1'l, So'] Il 3i □l, : 3b, 3c
A plurality of insulating substrates 4 are also arranged in between A61゜These extremely smooth substrates 4 should cause as much peeling and cracking as possible from the casting resin; :t! ``Because there is no linear expansion coefficient I'' 1ill
Same-way casting resin 5J (horizontal II)!・Mold with (1
, given one method ζ1. Ka Lj. 11. , :
Q) Jl: U1, (.

2.Boo? /li-fils 3a, 3h, 3e4 stored in molds] 7, then inject casting resin 5 11 and heat harden 4
An integral resin η-led coil was obtained. In addition,
6a, 61) are lead-out terminals of an electromagnetic coil consisting of 3a, 3h, and 3e. molded carp
ll-Oiζ, the weakest point is the absolutely amazing
At the interface between 4 and casting resin 5, peeling occurs at this part (.
easy. For example, with a dumbbell test piece 9 as shown in FIG. For comparison, as shown in the example test results in FIG. 11, when an insulating spacer is inserted, the A is reduced to about 50%. Moreover, even though the tensile strength was low, the fracture locations were all at the interface between the insulating spacer 10 and the casting resin 5).

As described above, even if the insulating spacer 4 is made of the same casting resin, the adhesive force may be extremely reduced depending on the surface condition. If such an interface with weak adhesion exists in a resin molded coil, thermal stress such as load fluctuations may cause peeling or cracking, causing partial discharge in this area, and eventually causing dielectric breakdown. Furthermore, if cracks or peeling occur in the spacer portion between the coil and the mold, there is a risk that a ground fault may occur due to surge, or moisture may be absorbed from this portion during rest, leading to tracking and tree breakage. In order to deal with these phenomena, the adhesive strength can be increased by roughening the surface of the spacer, care must be taken when handling the spacer to avoid getting oily, and if adhesive strength is insufficient, brimer treatment can be applied. It took a lot of time to process and process the spacers.

In addition, if the block coil deforms or breaks, it may not be possible to ensure the specified design and method, resulting in damage between coil conductors or block coils, so use adhesive tape or glass tape to Although this method is intended to prevent deformation of 11-, it requires a long time to work and is economically disadvantageous.

The present invention was made to solve the above problems, and
The purpose is to provide a resin molded coil with excellent quality and reliability that prevents peeling and cracking at the interface between the coil supporting insulating spacer and the casting resin, and prevents deformation of the coil. .

"Structure of the Invention" (Means for Solving the Problems) In order to achieve the above object, the present invention provides a resin molded block coil formed by integrally molding a block coil divided into a plurality of pieces (7) in the axial direction. In the coil, a high-strength fiber material is knitted into a cylindrical shape, and then a cylindrical sleeve impregnated or coated with resin is cut and a coil holding material made into a U-shape is fitted to each block coil. The cylindrical sleeve is arranged between each block coil as an insulating spacer.

(Function) According to the present invention, the sleeve made of high-strength fiber material is made of hardened resin, so it does not lose its shape even after molding, and the sleeve is cut into a U-shape and fitted into the block coil. If the coils are tied together, the coil will be similar to wrapping adhesive tape or the like, and will not be deformed. Also,
By fitting such sleeves, when storing the block coils, even if they are stacked, the block coils will not rub against each other due to the thickness of the sleeve, and deterioration in processing of the block coils can be prevented. Furthermore, since this sleeve has a mesh shape, the casting resin can easily pass through it, and unlike conventional sleeves, there is no boundary surface, so it is possible to prevent the phenomenon of peeling off on the surface of adhesive tape or the like. Furthermore, since the casting resin easily passes through the mesh of the sleeve, a uniform casting resin layer can be formed without impeding the impregnation path of the casting resin. In addition, this sleeve is strong because it is made of high-strength fiber material and hard resin, and it not only allows you to secure the dimensions of the coil when moving the coil and assembling the mold, but also
Since it is cylindrical or has an opening, it has appropriate elasticity and can maintain a predetermined size without damaging the coil.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view of the sleeve used in the present invention. This sleeve 11 is formed into a cylindrical shape by knitting glass fibers 12 having a thickness of 50 to 500 pIll. glass fiber 12
The distance d between them is selected based on the strength required for the sleeve 11 and the impregnability of the casting resin, and generally d=1 to 4 mm is selected. The thus-knitted cylindrical glass fiber sleeve 11 is made into a rectangular tube shape by inserting a core metal (not shown) therein so as to have a predetermined size. The glass fibers 12 are impregnated with or coated with the resin by immersing the cored metal in an epoxy resin layer (not shown), and then heating and hardening the glass fibers 12 with the resin. After that, if you remove the core metal, you will get a rectangular tube-shaped sleeve 1.
1 is obtained. The epoxy resin used here is selected to have good compatibility with the casting resin, but generally the same type of resin as the casting resin is used. In particular, since it is necessary to maintain the dimensions and shape constant until the casting resin is injected, a resin with a high heat distortion temperature is selected. Among the sleeves manufactured in this way, the axial height hi of the block coil 15 shown in FIG.
A sleeve having the same dimensions as the above is cut to form a U-shaped coil holding member 13 as shown in FIG. As shown in FIG. 4, when the block coil 15 wound only with the coil conductor 14 is removed from the winding form (not shown), a plurality of U-shaped coil holding members 13 are fitted around the coil. Hold it so that it does not lose its shape. Thereafter, as shown in FIG. 1, the block coils 1.5a, . In this case, a sleeve is placed between each block coil 15 as an insulating spacer 16, and a sleeve is also inserted between each block coil 15 and the inner mold 17 as an insulating spacer 18. After that, each block coil 15 is electrically connected, the outer mold 20 is attached, and the upper and lower end surface molds J9 are tightened.

After heating each block coil 15 assembled in the mold, setting it in a vacuum tank, casting the casting resin 5 under vacuum pressure, heating and hardening, and then releasing the mold 17, 19, 20. A one-piece resin molded coil is obtained.

The resin molded coil manufactured as described above has a coil holding material 13. Since the insulating spacers 16 and 18 are all mesh-shaped, the casting resin 5 easily enters the insulating spacers 16 and 18 and the mesh portion of the coil holding material 13.
Since it is integrated with the casting resin 5, there is no interface between the insulating spacer and the casting resin as in the conventional case.

In addition, since the sleeve 11 constituting the coil holding material 13 and the insulating spacer 16.18 is pre-impregnated or coated with resin and cured by heating, it is molded, so the compressive force due to the coil weight and the tightening between the mold and the coil It can withstand enough force. Furthermore, after winding the coil, a plurality of ``1r'' retaining holes 13, each having a ``1'' shape, are fitted together to form a 7' arrangement. If the coil holding material 13 is molded so that the odor stone in Fig. 3 is slightly smaller, the resin C treatment j7
．． The glass fibers act as a spring, and the state in which the -j fill holding material 3 is attached to the bracket becomes difficult to come off.
5hm culm It I: Cut 1, No. 3;
Since it is cut into a letter shape, it can be easily attached to the coil.

In addition, a coil holding member 13 consisting of the sleeve 11. Since the insulating spacers 16 and I8 have strength even before casting, they do not deform the coil after winding the coil and when assembling the coil into the mold, and the resin does not even touch the mesh part after casting. Since the molding resin easily enters the cast resin and there is no boundary surface, peeling is less likely to occur, and an excellent resin molded coil can be manufactured. Furthermore, conventional insulating bases require many complicated processes such as surface roughening and degreasing after casting, but the sleeve 11 is easy to manufacture, so it has an economical effect of simplifying the manufacturing process. Moa Z),.

In addition, the insulating spacer l 8 between the embodiment C (51, inner mold 172 and block coil 15 in FIG. 1): L
7. Even if a sleeve with a short culm is used, or a long sleeve corresponding to the overall height of the coil is used, the same effect can be achieved, and the workability is improved as well. There are advantages.

Furthermore, in the embodiment of FIG. 1, the block coil 15a
....In order to prevent the deformation of the 151, a mouth-shaped retainer is fitted from the outside, as shown in the partial cross-sectional view of Fig. 5.
- By fitting the fill holding material 22 to the NiDOIL holding material 21 on the sea urchin row side from the inside, it is also possible to further prevent the deformation of the sea urchin. In this case, if the voltage between the block coils 15 is low, the coil holding material 2
Since the two block coils 15 can share the voltage between the block coils 15 with only a thickness of 1.22 mm, the block coils 15 can be directly laminated through the coil holding materials 21 and 22. You can also do it.

Furthermore, when producing a large number of coils of the same capacity and size, as shown in Figure 6), when manufacturing the sleeve, a core metal corresponding to the block and coil distance h4 and = 11 coil method h3 should be used. Using this method, two sleeves 23°25 were made (15
After impregnating or coating these sleeves 23 and 25 with uboxy resin, they are stacked in two layers and heated to harden.
2, after removing the core metal, Vl
-By cutting at the Vl portion, a member having both the functions of the U-shaped coil holding member 24 and the insulating spacer (sleeve) 23 can be made. In this case, use an insulating spacer (
Since the sleeve) 23 and the coil holding material 24 are fixed at the intersection of the glass fibers, if the coil holding material 24 is attached to each block coil 15, the insulating spacer (sleeve)
23, the dimensions between each block coil can be secured, and the coil assembly work can be reduced. Further, the opening-shaped cutting portion 26 shown in FIG. 6 can be replaced with an insulating spacer 26 for securing the =j method between the inner mold 17 and the coil 15, as shown in FIG. 7, and τ can also be used. Although Fig. 6 shows the case where one block coil is provided per block coil, when the block coil itself is composed of multiple continuous windings, the insulating spacer (sleeve) 23 and coil holding material shown in Fig. 6 are used. It is also possible to manufacture in advance a structure in which a plurality of layers 24 are stacked.

[Effects of the Invention] As explained above, according to the resin molded coil of the present invention, a cylindrical sleeve made of a high-strength fiber material such as glass fiber is impregnated or coated with a resin to form a rectangular cylindrical shape. By using the molded product as a spacer or coil holding material, it can be integrated with the casting resin, preventing weak points such as peeling and obtaining a resin molded coil of excellent quality. There are economical effects, such as eliminating the need for manufacturing and taping work to maintain the shape of the coil, and also reducing the number of steps required for assembling the coil mold.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the state of the resin molded coil according to the present invention at the time of manufacture, Fig. 2 is a perspective view of the sleeve used in the present invention, and Fig. 3 is formed by adding the sleeve shown in Fig. 2. FIG. 4 is a sectional view of the main part showing the coil holding state, FIGS. 5 to 7 show other embodiments of the present invention, and FIG. 5 shows other embodiments of the coil holding state. FIG. 6 is a cross-sectional view showing another example of the coil holding material and spacer; FIG. 7 is a plan view showing the spacer shown in FIG. 6 attached to the coil; FIG. 9 is a schematic cross-sectional view of the main part of a conventional resin molded coil, FIG. 9 is a schematic diagram of a block coil before molding, and FIG. 1θ and FIG. It is a characteristic diagram. 5...Casting resin 11...Sleeve 13, 21.22.24...Coil holding material 16, 1g
, 23.25...Insulating spacer (sleeve) (8733) Agent Patent attorney Sho Inomata (and 1 other person)

Claims (2)

[Claims] (1) In a resin molded coil that is made by integrally molding a block coil divided into multiple pieces in the axial direction with resin, a cylindrical shape is formed by knitting a high-strength fiber material into a cylindrical shape and then impregnating or coating it with resin. A resin molded coil characterized in that a coil holding material made by cutting the sleeve into a U-shape is fitted and attached to each block coil, and the cylindrical sleeve is arranged as a spacer between each block coil. . (2) The resin molded coil according to claim (1), wherein the coil holding material and the spacer are integrally formed and incorporated into the block coil.