JPS61240614A - Shell-type transformer - Google Patents

Abstract

PURPOSE:To improve assembling-work efficiency and economization without lowering the performance, by changing one-time laminated number of iron core materials in accordance with the positions of spaced members. CONSTITUTION:Electromagnetic force acting on flat plate coils 1, as long as insulating plates 2 between coils and cores are not large enough in both thickness and rigidity, is conveyed to only the range of iron cores facing the spaced members 3 and is not actuated on mutual parts between the spaced members 3. The positions of the spaced members 3, which are to be positioned on the coil surface sides, are beforehand scribed on the insulating plates 2 facing the iron core surface and existing on both sides of the iron core, on the stage of parts-production, one-time laminated number is changed with those scribing lines to be used as marks, for laminating iron-core materials for changing the number of laminates. The one-time laminating number is decreased only on the position where the force is essentially conveyed and frictional force is necessitated, and on the other hand the one-time laminating number is increased at the parts not facing the spaced members 3, to the range which is allowable to magnetic characteristics, to improve assembling-work efficiency.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an external iron transformer, and more specifically, it relates to a coil group in which flat coils are stacked, and a spacer piece that supports a coil conductor. , relates to an external iron type transformer consisting of an iron core in which thin iron core materials are stacked around the legs of a coil group.

[Conventional technology]

Figures 2 to 3 show conventional outside iron type transformers, with insulating plates (
A) is inserted, and a plurality of spacing pieces (3) for supporting the conductor of the flat coil (1) are attached to the insulating plate (, 2). The iron core (the side iron core in the direction of the coil surface) (4
'a) and a coil axial side iron core (pb), and the coil group is supported and housed in a tank (A) with a fixing wedge (j).

To assemble the external iron type transformer having the above configuration, stack a predetermined number of flat plate coils (1), place insulating plates (, 2) between each coil and between the coil and the iron core, and then
In order to counter the electromagnetic force acting on the coil conductor, a spacing piece (3) is interposed between the coils.

The electromagnetic force referred to here is a large force generated by an overcurrent flowing through a coil due to a ground fault or short circuit, and is generated in the direction in which the coils are stacked, that is, in the axial direction of the coils.

Next, thin plate iron core materials are stacked around the legs of the coil group assembled as described above to form an iron core.

With the above configuration, the electromagnetic force is distributed between the spacer plate (3), the insulating plate (,
2) and is supported by the iron core (lI).For this purpose, the iron core (lI) is transmitted to the iron core (4'a) on the side of the coil surface
) and the coil axial side iron core (llb) are stacked one on top of the other and firmly tightened with wedges (5), tanks (6), etc., so that the electromagnetic force of the coil is applied to the iron core (lIa) facing the coil surface. Even if the iron core is transmitted, the iron core is constructed so that it will not shift due to the frictional force of the overlapping portion (overlapping area x number of overlapping surfaces x large friction coefficient of tightening surface pressure).

This iron core is made by laminating thin plates for the purpose of reducing iron loss, but the number of sheets to be laminated at one time is generally multiple (usually 2 to 3) from the viewpoint of workability such as stacking time and ease of stacking. ).

However, in a transformer that generates a large electromagnetic force, the number of layers stacked at one time is slightly less than (7 layers, etc.) in order to increase the number of overlapping surfaces as one means of increasing the frictional force.

Conventionally, this method of reducing the number of sheets stacked at one time was carried out over the entire area from the bottom to the top of the stack of iron cores (y).

[Problem that the invention seeks to solve]

In conventional external iron type transformers such as those mentioned above, the core is weak and difficult to stack, and since the number of stacks is large, it takes more time to stack, compared to the conventional transformer that stacks a large number of pieces at one time, making it less economical. There was a problem with the lack of.

This invention was made to solve this problem, and is an external iron type transformer that secures the frictional force of the iron core against the electromagnetic force of the coil, and improves workability and economic efficiency without causing the core to shift. The purpose is to obtain.

[Means for solving problems]

The outer iron type transformer according to the present invention reduces the number of stacked pieces at one time only in the range facing the spacer pieces arranged on the coil surface (the range where electromagnetic force acts on the core) in the laminated direction of the iron core, and The range where it is not opposed to (the range where electromagnetic force does not act) is 1
The number of stacked sheets per cycle is increased considering workability.

[Effect]

In this invention, assembly workability is improved without degrading performance.

〔Example〕

FIG. 1 shows an embodiment of the present invention, and is a diagram comparable to FIG. 7.

The electromagnetic force acting on the flat plate coil (1) will be transmitted to the core only in the area facing the spacing pieces (3), unless the insulating plate (co) between the coil and the core is extremely thick and has great rigidity. No force acts on the part between pieces (3). This was also confirmed by the results of experiments in which a force exceeding the frictional force was generated in a full-scale transformer and the misalignment of the iron core was observed.

For this reason, in the conventional structure, the unnecessary process of reducing the number of stacked thin iron core materials seven times to the part where electromagnetic force does not act was performed, but this invention eliminates this,
Originally, only in areas where force is transmitted and frictional force is required, the number of stacked sheets at one time should be slightly less (increase the number of overlapping surfaces), and the spacing pieces (
3) The number of sheets stacked at one time is increased to a number that is permissible in terms of magnetic properties in the portion not facing the above.

As described above, by increasing the number of thin iron cores stacked in the portions that do not face the spacing pieces (3), the assembly workability is improved. To do this, the second insulating plate (C) on the iron core surface (C) must be placed in advance at the part manufacturing stage.
A spacer piece (3) placed on the coil surface side is placed on the iron core side of 2).
), and when stacking the iron cores, use the marked line as a guide to change the number of sheets stacked at one time.

[Effects of the Invention] As is clear from the above description, the present invention has a simple structure in which the number of core materials stacked at one time is changed depending on the positional relationship of the spacing pieces, and improves workability and efficiency without reducing performance. Economical efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention, FIG. 2 is a side sectional view of a part of a conventional external iron transformer, and FIG.
- A cross-sectional view on a plane along line m, Figure 1 is IV- of Figure 3.
FIG. 3 is a cross-sectional view taken along the line IV. (1) Flat plate coil, (3) Spacing piece, (ri) Iron core. In each figure, the same reference numerals indicate the same or corresponding parts. Figure 1 Figure 4: @lU Figure 2 procedural amendment (voluntary)

Claims (1)

[Claims] A coil group formed by stacking flat coils, a plurality of spacing pieces disposed between the coil groups to support the coil conductor, and an iron core formed by stacking thin plate iron core materials around the legs of the coil group. In the external iron type transformer, the number of sheets of the thin iron core material stacked at one time is greater at a portion not facing the spacing piece than at a portion facing the spacing piece, and the joint portion is overlapped and joined. An external iron type transformer comprising the above-mentioned iron core.