JPS62125614A - Wiring method of stripe coil - Google Patents

Abstract

PURPOSE:To enable the easy maintenance of stability of a shape by providing a process wherein an adhesive layer on the inner-peripheral side of a stripe coil is set with light by an irradiating light source disposed inside a bobbin. CONSTITUTION:A reinforcement layer 10 is formed of a layered body of a transparent synthetic resin film 11 and a photosetting type adhesive layer 12. It is wound round in close contact in necessary times so that a polyester film is positioned on the bobbin 13 side, and thereby the layered body of the synthetic resin film 11 and the photosetting type adhesive layer 12 is formed. Irradiating light beams emitted from an irradiating light source 14 are transmitted through a bobbin 13 and the synthetic resin film 11 and reach the photosetting type adhesive layer 12, so as to set the photosetting type adhesive layer 12 in a very short time and at normal temperatures. As for a light irradiation treatment, a sufficient time of irradiation can be ensured without providing any special time for operation, when the irradiation treatment is conducted in parallel with a wiring operation. Thus, a wiring method of a stripe coil which enables the prevention of disorder or deformation of the coil after the removal of the bobbin and, consequently, is excellent in the stability of a shape with regard to its custody, transportation, incorporation in to a frame, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to Which the Invention Pertains] The present invention relates to a method of winding a coil for a stationary induction appliance, particularly a strip coil for a resin-molded induction appliance.

[Prior art and its problems]

FIG. 4 is a side sectional view showing an example of a conventional resin molded winding using a strip coil, in which a plurality of strip coils 1 such as 1, 1B, and iC are made of epoxy resin mixed with an inorganic filler. It is integrally molded in a mold resin 2 made of a cured product, and embedded terminal fittings 6 are provided in a predetermined angular direction. The strip coils 1A, IB, IC, etc. each have a thin strip-shaped strip conductor 4 made of aluminum, copper, etc. and an insulating sheet 5 made of polyester film, kraft paper, etc. on the outside of a winding frame 3 made of cylindrical pressboard, FRP, etc. The strip conductor and the beginning of the insulating sheet that are in contact with the winding frame 6 are fixed to the winding frame with adhesive tape, etc., and the thin winding frame and the strip coil are insulated at key points. The shape of the strip coil is maintained by binding it with tape. Therefore, the two-winding frame 6 has the role of preventing the coil from being deformed or coming apart from the beginning and end when the strip coil is stored, moved, incorporated into a mold, etc., and also to maintain the position of the coil in the mold. However, once the mold resin has hardened, it is more likely to become a source of thermal stress due to the difference in expansion coefficient, and if delamination occurs between the mold resin and the mold resin, it can become a source of partial discharge. There are drawbacks such as adverse effects on resin molded windings, and improvements are being sought from the standpoint of reducing insulation dimensions and cost reduction.

[Purpose of the invention]

The present invention was made in view of the above-mentioned situation, and an object of the present invention is to provide a method for winding a strip coil that can easily maintain shape stability and can be made smaller.

[Key points of the invention]

The present invention focuses on the fact that a photocurable resin can be made to have a diameter of 41ψ at room temperature by irradiating it with ultraviolet rays for a period of about one minute, for example. The coil is covered with a reinforcing layer made of a layered material so that the coil retains its shape even when the winding frame is removed. By configuring the winding method,
Conventionally, self-irradiation with light has been difficult, but a reinforcing layer can be easily formed on the contact surface between the strip coil and the winding frame in parallel with the winding process of the strip conductor.

[Embodiments of the invention]

The present invention will be explained below based on examples.

FIG. 1 is an explanatory diagram of an embodiment method of the present invention.

In the figure, reference numeral 13 denotes a transparent cylindrical winding frame that is supported and rotated by a winding machine (not shown), and is made of a transparent material that transmits irradiation light including ultraviolet rays, such as a cylindrical acrylic resin or glass tube. A spacer piece is interposed at key points in the circumferential direction to facilitate removal of the winding frame. Reference numeral 10 denotes a reinforcing layer consisting of a layered body of a transparent synthetic resin film 11 and a photocurable adhesive layer 12. For example, a polyester film coated with a liquid polyester ultraviolet curable resin is coated with a polyester film on the winding frame 16 side. A layered body of the synthetic resin film 11 and the photocurable adhesive layer 12 is formed by winding the film a necessary number of times with the film in close contact with each other so that the film is positioned. 1 is a strip coil tightly wound on the outside of the reinforcing layer 10, and a thin strip-shaped strip conductor 4 made of aluminum, copper, etc.
and an insulating sheet 5 such as a polyester film or electrically insulating paper are stacked together with the strip conductor 4 arranged inside, and the strip conductor for one turn at the beginning of winding is located on the outer peripheral surface of the layered body. Wrap it the necessary number of times so that it sticks to the layer 12,
Ru. Reference numeral 14 denotes an irradiation light source such as a high-pressure mercury lamp arranged inside the cylindrical winding frame 13, and the irradiation light emitted from the irradiation light source 14 is applied to the winding frame 16 and the synthetic resin film 11.
The photocurable adhesive layer 12 can be cured in a very short time and at room temperature by passing through and reaching the photocurable adhesive layer 12. A relatively thin reinforcing layer 10 can be formed. In addition, the timing of the light irradiation treatment may be any time after the first turn of the strip conductor is wound or after the winding process.If the irradiation treatment is performed in parallel with the winding work, Sufficient irradiation time can be secured without special work time. After finishing the winding work of the strip coil 1, the winding frame 1 is tightened to prevent unwinding of the winding end portion.
5 is removed, but the reinforcing layer 10, which is fixed to a suitable thickness at the first turn of the coil conductor, exhibits appropriate rigidity due to its complementary action with the coil conductor, making it easy to store and transport the coil. ,
Like the winding frame, it functions effectively to prevent the coil from coming apart and maintain its shape during various operations such as mold assembly, and when it is partially molded in the molding resin, it functions as a part of the strip conductor. However, since it is thinner than the conventional winding frame made of F'RP or presspod, which is thick and strong enough to withstand the winding work, it is less likely to generate thermal stress or voids, and therefore has fewer weak points in insulation. It is possible to obtain a resin molded winding wire.

FIG. 2 is an explanatory diagram showing a modification of the above-mentioned embodiment, in which the reinforcing layer 20 is fixed to the outer circumferential side of the east coil 1, and the reinforcing layer 20 is completely formed, unlike the seventh embodiment described above. The photo-curing treatment can be easily carried out using the irradiation light source 14 disposed outside the strip coil, taking into account obstacles such as the frame. Constructed as described above, the filament coil has a reinforcing layer 20.
By tightening the outer peripheral side, it is possible to obtain a strip coil with better shape stability.

FIG. 6 is a sectional view of a strip coil showing a different modification of the above-mentioned embodiment, in which a photo-curing resin is applied to both sides of the coil 10, and a reinforcing layer 60 is provided by photo-curing the reinforcing layer 60. This embodiment differs from the previous embodiment in that the entire surface is covered with a reinforcing layer, and the shape stability of the strip coil can be further strengthened.

Note that the photocurable adhesive is not limited to polyester-based ultraviolet curable resins, and may be selected from, for example, epoxy-based adhesives, visible light-curable adhesives, etc. as required.

It is also possible to use a thermosetting photocurable resin; in this case, the reinforcing layer is photocured to provide shape stability, the winding frame is removed, and the entire coil is heated and post-cured. If a thermosetting photocurable resin is also applied between the strip conductor and the insulating sheet, a strong strip coil can be formed by the thermosetting treatment.

〔Effect of the invention〕

As described above, the present invention includes a winding frame made of a transparent cylindrical body that transmits irradiation light, and a layered body of a transparent synthetic resin film and a photocurable adhesive on the outside of the winding frame, and a layered body of a photocurable adhesive. A strip conductor whose winding start portion is in close contact with the layer is wound with an insulating sheet interposed between the layers, and the light curing adhesive layer is photocured using an irradiation light source placed inside the transparent winding frame to form the strip conductor. The structure was such that a fixed reinforcing layer was formed.

As a result, a thin reinforcing layer with increased rigidity is formed in a short time in parallel with the winding process by being fixed to the strip conductor on the inner periphery of the strip coil, which is difficult to photocure due to interference with the winding frame. storage and transportation that prevents the coil from coming apart or deforming even after the winding frame is removed.

This method eliminates problems that impede the performance of resin molded winding wires, such as thermal stress and partial discharge that occur in the winding frame in the conventional technology. This contributes to the compact formation of resin molded windings with good performance.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an explanatory diagram of an embodiment method of the present invention, Fig. 2 is an explanatory diagram showing a modification of the embodiment, and Fig. 6 is an explanatory diagram of a main part showing a different modification of the embodiment. FIG. 4 is a side sectional view showing an example of a conventional structure of a resin molded winding. 1, IA, IB, IC... strip coil, 2... mold resin, 5, 16... winding frame, 4... strip conductor, 5...
...Insulating sheet, 10,20.30...Reinforcement layer, 11
...Synthetic resin film, 12...Photo-curing adhesive layer, 16...-9-Kajin Patent Attorney Yamaguchi -61 Figure 1, 2nd wall

Claims (1)

[Scope of Claims] 1) By a reinforcing layer consisting of a layered body of a transparent synthetic resin film and a photocurable adhesive, which is closely formed on the surface of a coil made by layering a thin strip conductor and an insulating sheet. A method for winding a strip coil in which the shape of the coil is maintained, the synthetic resin film being wound one or more times around the outer peripheral surface of a rotationally driven cylindrical transparent winding frame with the adhesive layer on the outside. After that, there is a step of overlapping the strip conductor and an insulating sheet so that the strip conductor is in close contact with the adhesive layer, and a step of winding the strip conductor and an insulating sheet in an overlapping manner so that the strip conductor is in close contact with the adhesive layer. A method for winding a strip coil, comprising the step of photo-curing the wire. 2) The method according to claim 1, characterized in that the photocuring step of the adhesive layer is carried out while rotating the winding frame after the strip conductor has been wound one or more times. How to wind a strip coil. 3) A method for winding a strip coil according to claim 1, characterized in that the winding frame is removed after the winding step is completed.