JPH03105904A - Amorphous iron core for transformer - Google Patents

Abstract

PURPOSE:To suppress an increase in the dimension of the title iron core as much as possible so as to obtain an amorphous-cut ironcore transformer having excellent magnetic characteristics by winding an amorphous thin belt around the frame of the iron core, with the belt overlapping each other at two or more positions and its longer side as the innermost layer. CONSTITUTION:The amorphous-cut iron-core for transformer of this invention is manufactured by winding an amorphous thin belt 2 out to a prescribed size around an iron-core frame 1 in an overlapped state. By alternately moving the overlapped position of the belt 2 at the time of winding, the belt 2 is overlapped at two positions. When the belt 2 is overlapped with each other at a plurality of positions of two or more in such way, longer and shorter sides 3 and 4 are produced by the belt 2. In addition, since the belt 2 is wound around the frame 1, with its longer side 3 as the innermost layer, overlapped sections 10 are regularly formed and gaps 20 and 21 are also formed at regular intervals. Therefore, deterioration of the magnetic characteristics of this iron core can be prevented, since the occurrence of unnecessary stress at the sections 10 can be suppressed sharply.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a joint part of an amorphous cut core transformer.

[Conventional technology]

In the conventional joining structure of amorphous cut iron cores using amorphous ribbons, as described in Japanese Patent Application Laid-open No. 175110/1982, the joining is performed at one overlapping location.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, since the overlapping joints are concentrated in one place, no consideration is given to the fact that the joints swell, and there is a problem in that the shape of the iron core becomes large.

An object of the present invention is to provide an amorphous-cut core transformer that minimizes the increase in core dimensions and has good magnetic properties.

[Means to solve the problem]

In order to achieve the above object, the present invention has two or more overlapping joints, and furthermore, when winding the long side amorphous ribbon around the iron core frame, the amorphous ribbon is laminated so as to be the innermost side. .

[Effect]

A cut core in which two or more overlapping points are provided at the joint part suppresses the bulge of the core that increases due to overlapping. This makes it possible to reduce the size of the cut core. Further, by stacking the amorphous ribbons forming the long sides so as to be on the innermost side of the core frame, a regularly shaped joint is formed. As a result, no unnecessary space is created in the joint, so stress can be prevented from occurring and good magnetic properties can be achieved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 shows an amorphous cut core transformer having two overlapping parts at a joint 10, and FIG. 2 shows an enlarged view of the joint 10.

The amorphous cut core transformer is manufactured by winding amorphous ribbons 2 cut to a predetermined size around a core frame 1 so as to overlap each other to a predetermined size. At this time, two overlapping points are formed by moving the overlapping points alternately. By moving the overlapping points multiple times, an amorphous cut core transformer with multiple overlapping points can be obtained, and the bulge at the joint can be reduced. On the other hand, if the overlapping locations are two or more, or a plurality of locations, the amorphous ribbon 2 will have a long side 3 and a short side 4. As shown in FIG. 2, the amorphous ribbon 2 of the present invention
By stacking the long sides 3 on the innermost side with respect to the core frame 1, the joints 10 are formed in a regular manner, and the gaps 20, 21 are also formed in a regular manner. Therefore, generation of unnecessary stress in the joint portion 10 can be significantly suppressed, and deterioration of magnetic properties can be prevented. By the way, in the case of overlapping two places as shown in Figure 2,
When laminated so that the short side 4 is the innermost side of the core frame 1,
Only one of the gaps 21 formed at the innermost part becomes irregular, but from then on, the joints 10 are formed regularly, and although there is no major difference between the two, as mentioned earlier, the long side 3 is set to the innermost part. It exhibits better characteristics when laminated with two layers. FIG. 3 shows the difference in the joint 1o caused by the lamination of the long side 3 and the short side 4 in the five-position overlapping joint structure. (a) is a stacked product with the short side 4 being the innermost side, and (b) is a stacked product with the long side 3 being the innermost side, and there is a large difference in the shape of the joint 1o. It turns out that (b)
It can be seen that the lamination method shown in Figure 1 is good. That is, it can be seen that it is sufficient to stack the layers so that the long side 3 is located at the innermost side of the core frame 1.

According to this embodiment, the fourth
Since it is possible to suppress the increase in the core size due to the bulge in the joints as shown in the figure, the core shape can be made smaller, and since the joints are performed regularly, good magnetic properties can be obtained.

〔Effect of the invention〕

According to the present invention, the bulge at the joint portion of the cut iron core can be reduced, so the shape of the iron core can be reduced, and the transformer can be made smaller.

In addition, since the overlapping portions and gaps in the joint are regularly shaped, the generated stress can be reduced and good magnetic properties can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an iron core according to an embodiment of the present invention, FIG. 2 is an enlarged view of a joint in FIG. 1, and FIG. 3 is an enlarged view of a joint of five overlap joints. 1... Iron core frame, 2... Amorphous ribbon, 3...
Long side, Figure 1 (revised) 2 Cow l Figure 2 3 Figure (b) 20 2

Claims (2)

[Claims] 1. In the amorphous amorphous cut iron core, which is made up of an iron core frame that forms the core and an amorphous thin strip cut to a predetermined size so that an overlap margin is a certain length when wound around the iron core frame, there are two overlap points. An amorphous transformer core characterized by being laminated to achieve the above characteristics. 2. 2. The amorphous transformer core according to claim 1, wherein when the amorphous amorphous thin strip cut to a predetermined size is wound around the core frame, the amorphous thin strip serving as the long side is laminated so as to be on the innermost side of the core frame. .