JPH04343210A - Transformer - Google Patents

Abstract

PURPOSE:To prevent occurrence of a core deviation by a method wherein, pertaining to a shell-type transformer on which core junction part structure is improved, sufficient frictional force is secured against the electromagnetic force generated on a tabular coil. CONSTITUTION:In the composition consisting of a coil group formed by stacking an insulating plate 2 on which a plurality of spacers 3, supporting a tabular coil, are adhered, a core 8 formed by stacking thin plate-type core materials 7a and 7b around the leg part of the coil group, a delta-shaped thin plate-type core piece 7c is characteristically provided on the junction part of the thin plate type cores 7a and 7b located on the part opposing to the spacer 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external iron type transformer, and more particularly to a transformer having an improved core joint structure.

0002

2. Description of the Related Art FIG. 3 is a front sectional view showing a conventional outside iron type transformer, FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a sectional view taken along line V-V in FIG. 4. It is.

As shown in FIGS. 3 to 5, an insulating plate 2 is inserted between the flat coils 1 and between the flat coil 1 and the iron core 4. A plurality of spacing pieces 3 are pasted to support the conductors.

[0004] Also, the iron core 4 has a side iron core 4a in the direction of the coil surface.
and a coil axial side iron core 4b, and is supported and housed in a tank 6 with a wedge 5 for tightening and fixing the coil group.

[0005] When assembling the external iron type transformer constructed as described above, a predetermined number of flat coils 1 are stacked, and insulating plates 2 are placed between each flat coil 1 and between the flat coil 1 and the iron core 4. At the same time, in order to counter the electromagnetic force acting on the coil conductor and to cool the coil, a plurality of spacing pieces 3 are attached to the insulating plate 2 to be interposed between the flat coils 1.

[0006] The electromagnetic force referred to here is a large force generated by an overcurrent flowing through the flat plate coil 1 due to a ground fault or short circuit accident, and is generated in the stacking direction of the flat plate coil 1, that is, in the axial direction of the flat plate coil 1. It is.

[0007] Next, the iron core 4 is formed by stacking thin plate iron core materials around the legs of the coil group assembled as described above.

With the above configuration, the electromagnetic force is transmitted between the spacing pieces 3,
It is transmitted to the iron core 4 via the insulating plate 2 and supported by the iron core 4. Therefore, the iron core 4 is constructed by stacking the coil surface direction side iron core 4a and the coil axial direction iron core 4b with their ends overlapping each other, and firmly tightening them with wedges 5, tanks 6, etc., so that the electromagnetic force of the flat coil 1 is the iron core 4a facing the coil surface.
The structure is such that the core 4 does not shift even if the force is applied to the core 4 due to the frictional force of the overlapping portion (overlapping area x number of overlapping surfaces x tightening pressure x friction coefficient).

[0009] Since the spacing piece 3 is divided into a large number of pieces in the direction of core stack height, the electromagnetic force of the flat coil 1 is
It is transmitted through the spacing piece 3 only to the portion of the coil surface direction side core 4a facing the spacing piece 3, and is supported by the frictional force of the overlapping portion of the core in that portion and the coil axial direction iron core 4b. That is, no force is applied to the core 4 facing the portion between the spacing pieces 3. This was also confirmed from the results of experimentally observing the displacement of the iron core 4 by generating a force that exceeds the frictional force in a full-scale transformer.

[0010] Furthermore, the overlapping area of the cores 4 is limited by the shape of the core joint. In other words, in the case of a picture frame shape, in order to increase the overlapping dimension, it is necessary to increase the size of the notch at one end of the thin plate iron core material. In terms of core performance and economy, it is generally appropriate for the size of this notch to be 5 to 10% or less.

[0011]

[Problems to be Solved by the Invention] In the conventional transformer core joint structure, there is a limit to the overlapping area of the core 4.
In a transformer in which the electromagnetic force generated in the flat plate coil 1 is extremely large, there is a problem that the frictional force is insufficient.

The present invention has been made to solve the above-mentioned problems, and provides a transformer that ensures sufficient frictional force against the electromagnetic force generated in the flat plate coil and that does not cause core misalignment. The purpose is to

[0013]

[Means for Solving the Problems] A transformer according to the present invention includes:
A coil group formed by stacking insulating plates to which a plurality of spacing pieces are attached to support a flat coil and a coil conductor, and an iron core formed by stacking thin plate iron core materials around the legs of the coil group. In this invention, a triangular thin plate iron core piece is disposed at a joint portion of the thin plate iron core material in a portion facing the spacing piece.

[0014]

[Function] In the transformer according to the present invention, by providing the triangular thin plate core piece at the core joint portion, the overlapping area of the core 7 is increased, and the core frictional force is increased.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the transformer of this embodiment is also constructed almost similarly to the conventional transformer shown in FIGS. 3 to 5, but in this embodiment, the iron core 7 is The thin plate iron core material 7a on the coil surface direction side, the thin plate iron core material 7b on the coil axial direction side, and the triangular thin plate iron core piece 7c arranged in the part facing the spacer pieces 3 face the part between the spacing pieces 3 as in the conventional case. It is composed of a coil surface direction side iron core 4a and a coil axial direction side iron core 4b.

That is, a triangular thin plate iron core piece 7c is disposed at the joint between the thin plate iron core members 7a and 7b in a portion facing the spacing piece 3. Note that in FIG. 1, reference numeral 8 indicates a direction with good magnetic properties.

In the external iron type transformer constructed as described above, the electromagnetic force generated in the flat plate coil 1 is transmitted through the spacer piece 3 to the thin plate iron core material 7a on the side facing the spacer piece 3 in the direction of the coil surface. Furthermore, the thin plate iron core material 7b on the coil surface direction side
The force is transmitted from the triangular thin plate iron core piece 7c to the thin plate iron core piece 7b on the coil axial side through core frictional force, and from this triangular thin plate iron core piece 7c to the thin plate iron core material 7b on the coil axial side.
Supported by

The overlapping area of the thin plate iron core 7a and the triangular thin plate core piece 7c on the side in the direction of the coil plane, and the overlap area of the iron core 7 of the thin plate iron core piece 7c and the thin plate iron core piece 7b on the side in the coil axis direction are (core width). square, and the conventional picture frame core (Fig. 3
This is a significant increase compared to the case of (see code 4 in item 5).
A large amount of frictional force can be obtained.

Further, the thin iron core materials 7a, 7b and the thin iron core pieces 7c are shaped so that scrap of the iron core material does not occur.

Although the above embodiment shows the case where the structure of the present invention is applied to the entire height of the core in the portion facing the spacing piece 3, the present invention is not limited to this. A sufficient effect can be obtained by applying the iron core height corresponding to the generated electromagnetic force.

[0021]

[Effects of the Invention] As described in detail above, according to the transformer of the present invention, it has a simple structure in which a triangular thin plate core piece is provided in a part of the core joint, and the transformer has a simple structure in which a triangular thin plate core piece is provided in a part of the core joint. This makes it possible to significantly improve the strength against large electromagnetic forces.

[Brief explanation of drawings]

FIG. 1 is a plan sectional view showing a transformer according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a front sectional view showing a conventional transformer.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a sectional view taken along line V-V in FIG. 4;

[Explanation of symbols]

1. Flat plate coil 2. Insulating plate 3 Spacing piece 7 Iron core 7a, 7b Thin plate iron core material 7c　Triangular thin plate iron core piece

Claims (1)

[Claims] [Claim 1] A coil group formed by stacking insulating plates to which a plurality of spacing pieces are attached to support a flat coil and a coil conductor, and a thin plate iron core material stacked around the legs of the coil group. What is claimed is: 1. A transformer comprising an iron core, wherein a triangular thin plate iron core piece is disposed at a joint portion of the thin plate iron core material in a portion facing the spacing piece.