JPH08236384A - Manufacture of transformer winding - Google Patents

Abstract

PURPOSE: To provide a method of manufacturing a transformer winding, wherein a winding operation is capable of being easily automated without making an automatic winding equipment complicated in mechanism, and the wiring can be lessened in manufacturing man-hours CONSTITUTION: A winding conductor 12 is wound in multilayer, and an insulating layer 20 is provided not only between the winding conductor layers but also between the adjacent winding conductors for the manufacture of a transformer winding, wherein the winding conductor 12 is wound as a tape-like interlayer insulator 20 of larger width than the sum of the width and thickness of the winding conductor 12 is put on it along the direction of winding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a transformer winding, and more particularly to a method for manufacturing a transformer winding having interlayer insulation between winding layers.

[0002]

2. Description of the Related Art A resin mold transformer which has been generally adopted in the past has a main part as shown in FIG.
The low voltage coil 2 is arranged on the outer circumference of the iron core 3, and the high voltage coil 1 is arranged on the outer circumference thereof.

As shown in the cross section of FIG. 15, this high-voltage coil 1 has a coil-shaped insulating layer 11 made of a sheet-like insulating material on a winding die (not shown), and is insulated in sequence. The conductor 10 is wound and formed with the interlayer material 14 interposed between layers. That is, one layer of an insulated conductor (winding conductor) 10 made of a wire insulation 13 in which a wire 12 such as copper or aluminum is covered with enamel or a non-woven fabric of a polymer film or a polymer fiber is spirally wound. Then, a sheet-shaped polymer film, a non-woven fabric of polymer fibers, an insulating material of glass fiber cloth, or an epoxy resin is impregnated or applied to the insulating material on the outer periphery thereof to form a cured or semi-cured state into a bag shape. Rolled interlayer material 14
To place.

Then, one layer of the insulated conductor 10 and the inter-layer material 14 are alternately wound by a prescribed number of layers and a prescribed number of times, and then the coil outer insulating layer 15 is formed by a sheet-like insulating material, and the winding-interval is provided between the windings. In addition, an epoxy resin filled with an inorganic powder is injected into both ends of the winding, and is cured by heating. Note that, for example, Japanese Patent Application Laid-Open No. 6-120024 can be cited as one related to this.

[0005]

When the winding conductor is wound in multiple layers in this way, the winding width of one layer is the capacitance of the transformer.
Since it depends on the voltage and the like, it is necessary to prepare an interlayer insulating material having a different width for each type of transformer, which is uneconomical. Furthermore, since the inter-layer material is wound in each winding of one layer, the mechanism of the automatic winding machine becomes complicated, and sometimes the application of the automatic winding machine is difficult.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to facilitate the automation of the winding work without making the mechanism of the automatic winding machine complicated. Another object of the present invention is to provide a method of manufacturing a transformer winding of this type, which can reduce the number of manufacturing steps of the winding.

[0007]

That is, the present invention provides a transformer winding in which a winding conductor is wound in multiple layers and an insulating layer is provided between the multiple layers and between adjacent winding conductors. In the winding method, the tape-shaped interlayer insulator having at least twice the width of the winding conductor and the sum of the thickness of the winding conductor in the direction in which the winding advances. In order to achieve the intended purpose, the coil is wound around the winding conductor.

In the present invention, the tape-shaped insulator is made by impregnating or coating a glass fiber cloth, a thermoplastic film or a non-woven fabric of fiber with an epoxy resin, and using a semi-cured prepreg material. This semi-cured epoxy resin is heat-cured after winding.

[0009]

In other words, according to such a method of manufacturing a transformer winding, since the winding is performed while attaching a tape-like insulating material having a width wider than the conductor width above and below or above the bare conductor, the width of the tape is reduced. The part projecting in the direction is pressed downward by the next conductor to be wound next, and at this time, the insulating layer between the adjacent conductors and the interlayer insulating layer can be formed at the same time. It is not necessary to insert an interlayer insulating material for each winding layer of the conductor, and automation of winding work can be facilitated. In addition, since the insulating layer between the adjacent winding conductors and the insulating layer between the winding conductor layers are formed when the winding is wound, it is possible to eliminate the need for pre-insulation of the winding conductor. Therefore, it is possible to reduce the number of steps and the manufacturing time.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 shows a cross section of a high-voltage coil in the case of a molded transformer which is an embodiment thereof. The winding manufacturing method in this embodiment is performed by impregnating a polymer film or a glass fiber cloth with epoxy resin on a winding die (not shown), and using a semi-cured prepreg sheet-like insulating material to form a coil inner insulating layer. 11 is formed, and the insulating tape 20 is attached on the conductor 12 and the winding is performed.

The winding is sequentially wound from the lower layer of FIG. 2 to the upper layer, and the width of the insulating tape 20 is w that of the conductor 12.
If the thickness is d, it is 3w + d. When winding from the left to the right in the drawing of FIG. 2, as shown in FIG. 3, the width dimension of w to the left side of the conductor 12 and w + d to the right side is projected, When winding from the right side to the left side in the drawing of FIG. 2, the width dimension of w + d is projected to the left side of the conductor 12 and w is projected to the right side as shown in FIG.

Where the conductor 12 changes its winding direction from left to right or from right to left, the insulating tape 20 is cut by gradually shifting the insulating tape 20 by a dimension d while the conductor 12 makes one revolution. The winding work can be completed without doing.

In this embodiment, two winding blocks 30 are wound as shown in FIG. 1 in the same manner as described above, and a polymer film or glass fiber cloth is impregnated with epoxy resin at the outermost periphery thereof to be semi-cured. After forming the coil outer insulating layer 15 with the prepreg sheet-like insulating material in the state, the two winding blocks 3
Zero-powder and both ends of the winding block 30 are injected and cured with an inorganic powder-filled epoxy resin 16 to obtain a high voltage winding of a molded transformer.

In the case of this embodiment, if the thickness of the insulating layer between adjacent winding conductors is 1, the thickness of the interlayer insulating layer is 3
Will be obtained.

As the material of the insulating tape 20, a polymer film of polyethylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polyether ether ketone, polyamide imide, polyether imide, polyimide or the like, or an epoxy for the polymer film is used. A semi-cured prepreg material coated with and impregnated with a resin, a glass fiber cloth, or a semi-cured prepreg material coated with and impregnated with epoxy resin on a cloth of polymer chemical fiber is used.

When the insulating tape is a prepreg, it is possible to cure the epoxy resin 16 filled with the inorganic powder at the same time, or to cure the epoxy resin 16 filled with the inorganic powder in advance before the injection.

When the number of the winding block 30 is one, the winding block 30 is wound with a tape of a semi-cured prepreg material obtained by coating and impregnating a cloth of glass fiber or a cloth of polymer chemical fiber with epoxy resin. It is also possible to obtain the high voltage coil of the dry type transformer by covering the whole while winding the insulating tape 20 at the portion protruding from the end and heating and curing the prepreg material.

FIG. 5 shows another embodiment. 6 and 7 show the relationship between the winding conductor 12 and the insulating tape 20 during winding in this embodiment. In the case of this embodiment, what is different from the above-described embodiment is the way of stacking the winding conductor and the insulating tape 20.

That is, when the winding direction is from left to right in FIG. 5, w is added to the right of the winding conductor as shown in FIG.
The insulating tape 20 is protruded by + d dimension, and when the winding direction is from right to left side, the insulating tape 20 is protruded by w + d dimension on the left side of the winding conductor as shown in FIG. Therefore, in this embodiment, when the insulation thickness between adjacent conductors is 1, a winding having an interlayer insulation layer thickness of 2 is obtained.

FIG. 8 shows still another embodiment of the present invention. 9 and 10 are views showing the relationship between the winding conductor 12 and the insulating tapes 20 and 21 at the time of winding in the case of this embodiment.

The difference of this embodiment from the previous embodiment is that an insulating tape 21 having the same width as that of the conductor 12 is also wound below the conductor 12. In this embodiment, when the insulation thickness between adjacent conductors is 1, a winding coil having an interlayer insulation layer thickness of 4 is obtained.

FIG. 11 shows still another embodiment of the present invention. 12 and 13 show the relationship between the winding conductor 12 and the insulating tapes 20 and 21 during winding in this embodiment. The difference of this embodiment is that when the insulating tape 21 attached below the conductor 12 is wound from the left side to the right side in the drawing of FIG. 11, the width of the conductor 12 is set to the right side of the conductor 12 as shown in FIG. When w is projected and wound from the right side to the left side, the conductor 1 is placed on the left side of the conductor 12 as shown in FIG.
The width w of 2 is projected and wound. In this embodiment, when the insulation thickness between adjacent conductors is 1, a winding coil having an interlayer insulation layer thickness of 5 is obtained.

As described above with reference to various embodiments, according to the present invention, the wire insulation and the interlayer insulation layer can be formed at the time of winding the winding, and the conductor used for the winding can be formed. Molded transformer winding that is inexpensive and has stable insulation and electrical characteristics due to automatic winding because it does not require wire insulation in advance and does not require interlayer insulation to be inserted in each winding layer. Can be obtained.

[0024]

As described above, according to the present invention,
Since the inter-layer insulation is formed at the same time as the winding is wound, it is not necessary to insert the inter-layer insulation material for each layer of the winding, and therefore, the winding work can be performed without complicating the mechanism of the automatic winding machine. It is possible to obtain a method for manufacturing a transformer winding of this kind, which can facilitate automation of the manufacturing method and can reduce the number of manufacturing steps of the winding.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a winding manufactured by a method for manufacturing a transformer winding of the present invention.

FIG. 2 is a vertical cross-sectional side view showing a winding portion of an embodiment of a method for manufacturing a transformer winding according to the present invention.

FIG. 3 is a partial cross-sectional perspective view showing the relationship between the winding conductor and the insulating tape during winding according to the embodiment of the manufacturing method of the present invention.

FIG. 4 is a partial cross-sectional perspective view showing the relationship between the winding conductor and the insulating tape during winding according to the embodiment of the manufacturing method of the present invention.

FIG. 5 is a vertical cross-sectional side view showing a winding portion of another embodiment of the method for manufacturing a transformer winding according to the present invention.

FIG. 6 is a partial cross-sectional perspective view showing the relationship between the winding conductor and the insulating tape during winding according to another embodiment of the manufacturing method of the present invention.

FIG. 7 is a partial cross-sectional perspective view showing the relationship between a winding conductor and an insulating tape during winding according to another embodiment of the manufacturing method of the present invention.

FIG. 8 is a vertical cross-sectional side view showing a winding portion of the transformer winding manufacturing method according to another embodiment of the present invention.

FIG. 9 is a partial cross-sectional perspective view showing the relationship between the winding conductor and the insulating tape during winding according to another embodiment of the manufacturing method of the present invention.

FIG. 10 is a partial cross-sectional perspective view showing the relationship between the winding conductor and the insulating tape during winding according to another embodiment of the manufacturing method of the present invention.

FIG. 11 is a vertical cross-sectional side view showing a winding portion of another embodiment of the method for manufacturing a transformer winding according to the present invention.

FIG. 12 is a partial cross-sectional perspective view showing the relationship between the winding conductor and the insulating tape during winding according to another embodiment of the manufacturing method of the present invention.

FIG. 13 is a partial cross-sectional perspective view showing the relationship between the winding conductor and the insulating tape during winding according to another embodiment of the manufacturing method of the present invention.

FIG. 14 is a vertical cross-sectional side view of a molded transformer showing a conventional transformer coil and its surroundings.

FIG. 15 is a vertical sectional side view of a high voltage coil of a conventional mold transformer.

[Explanation of symbols]

1 ... High voltage coil, 2 ... Low voltage coil, 3 ... Iron core, 10
... Insulating conductor, 11 ... Coil inner insulating layer, 12 ... Winding conductor, 13 ... Element insulating layer, 14 ... Interlayer insulating layer, 15 ... Outer insulating layer, 16 ... Inorganic powder-filled epoxy resin, 20 ... Insulating tape, 21 … Insulating tape, 30… Winding block.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Izumi Nagumi 4-6 Kanda Sugawadai, Chiyoda-ku, Tokyo Inside the Industrial Equipment Division, Hitachi, Ltd.

Claims (7)

[Claims] 1. A method for manufacturing a transformer winding, wherein winding conductors are wound in multiple layers, and an insulating layer is provided between the multiple layers and between adjacent winding conductors. At the time of winding, the tape-shaped interlayer insulator having at least twice the width of the winding conductor and the width of the sum of the thickness of the winding conductor is attached on the winding conductor in the winding direction. A method for manufacturing a transformer winding, which is characterized in that it is turned. 2. A method of manufacturing a transformer winding, wherein a winding conductor having an insulating layer on a surface thereof is wound into multiple layers, and an interlayer insulating layer is provided between the multiple layers. When winding the conductor, a tape-like insulator having a width larger than the sum of the width and the thickness of the winding conductor is doubled in the winding direction. ,
A method for manufacturing a transformer winding, wherein an insulating layer between winding conductors and an insulating layer between winding layers are formed simultaneously. 3. A method for manufacturing a transformer winding, wherein winding conductors are wound in multiple layers, and an insulating layer is provided between the multiple layers and between adjacent winding conductors. At the time of winding, the tape-shaped interlayer insulator having a width larger than the sum of the width and the thickness of the winding conductor is doubled in the winding direction, with the core displaced on the winding conductor. A method of manufacturing a transformer winding, characterized in that the winding conductor and the interlayer insulating material are simultaneously wound together. 4. The method for manufacturing a transformer winding according to claim 1, 2 or 3, wherein a thermoplastic film is used for the tape-shaped insulator. 5. A winding conductor is obtained by impregnating or applying epoxy resin to a glass fiber cloth, a thermoplastic film or a non-woven fabric of fiber on the tape-shaped insulator, and using a prepreg material in a semi-cured state. The method of manufacturing a transformer winding according to claim 1, 2 or 3, wherein the semi-cured epoxy resin is cured by heating after being rotated. 6. A method for manufacturing a transformer winding, wherein winding conductors are wound in multiple layers, and an insulating layer is provided between the multiple layers and between adjacent winding conductors. At the time of winding, the tape-shaped interlayer insulator having a width larger than the sum of the width and the thickness of the winding conductor is doubled in the winding direction, with the core displaced on the winding conductor. Winding the winding conductor and the interlayer insulation at the same time,
In addition, after the winding, a method of manufacturing a transformer winding, characterized in that an epoxy resin filled with an inorganic powder is injected into the wound winding portion and cured by heating. 7. A method for manufacturing a transformer winding, wherein winding conductors are wound in multiple layers, and an insulating layer is provided between the multiple layers and between adjacent winding conductors. At the time of winding, the tape-shaped interlayer insulator having a width larger than the sum of the width and the thickness of the winding conductor is doubled in the winding direction, with the core displaced on the winding conductor. Winding the winding conductor and the interlayer insulation at the same time,
After winding, the entire outside of the wound winding portion is surrounded with a prepreg material, and the insulating layer between the windings, the insulating layer between the winding layers and this prepreg material are heated and integrally cured. A method for manufacturing a transformer winding, characterized in that.