JPS63164409A - Transformer - Google Patents

Abstract

PURPOSE:To eliminate a gap paper inserting process and lower the cost by joining the butt joint surfaces of the magnetic more with a bonding agent containing a mixture having freely determined constant grain size and fixing the core. CONSTITUTION:A bobbin 9 providing a winding 8 is inserted to the center leg portion of an E type core 7. The butt joint surfaces of the E type core 7 are coated with a bonding agent 10. This bonding agent 10 contains a mixture 11 having constant grain size. This mixture 11 causes the butt joint surfaces of the E type core 7 and I type core 12 to have the air gap as large as grain size of the mixture 11. Therefore, the same magnetic characteristic can be acquired, unlike the prior art, without inserting the gap paper to the butt joint surface. Accordingly, the title transformer has a superiority to the transformer of prior art in the cost and corresponding capability.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to transformers used in various power supply equipment, video equipment, audio equipment, industrial equipment, and the like.

BACKGROUND OF THE INVENTION Recent technical demands for transformers include higher frequency, smaller size, and higher efficiency, and in response to these demands, the number of transformers using ferrite cores is increasing. In order to prevent performance degradation of the ferrite core magnetic core that constitutes the magnetic circuit due to magnetic saturation, an air gap is generally provided at the butt joint surface of the magnetic core.

A conventional transformer with a ferrite magnetic core had a configuration as shown in Figure 3.

That is, the bobbin 2 with the winding 1 is inserted into the X-shaped core 3, and the X-shaped core 3 and the
The abutting surfaces of the mold cores 4 are joined, and the abutting surfaces are sandwiched with a gap paper 6 to create an air gap effect and an adhesive 6 to adhesively fix the X-shaped cores 3 and 4. It is structured in a detailed manner.

Problems to be Solved by the Invention However, with this configuration, there is a drawback that it takes time and effort to insert the gap paper 5, and sometimes defects occur due to the gap paper 6 not being inserted.

A means to solve the interlayer point and a means to solve the above problems is to mix a mixture with a certain particle size into the adhesive instead of inserting gap paper. By doing this,
It is designed to replace gap paper.

action The effect of this means is as follows.

In other words, until now, as a method to prevent performance degradation due to magnetic saturation, in order to create an air gap on the butt joint surfaces of the magnetic cores, gap paper was inserted between the butt joint surfaces and the core was fixed with adhesive. By mixing a mixture with an arbitrary fixed particle size into the adhesive, it is possible to eliminate the need for gap paper on the abutting surfaces of the magnetic cores, making it possible to achieve extremely high productivity.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In FIGS. 1 and 2, 7 is an X-shaped core, and a bobbin 9 on which a winding 8 is applied is inserted into the middle leg of the X-shaped core 7. Adhesive 1o is applied to each of the butt joint surfaces of the X-shaped core 7 into which the bobbin 9 is inserted.

This adhesive 1o contains a mixture 1 with a certain particle size.
1 (glass, stone powder, etc.), and these mixtures 11 form an X-shaped core 7 as shown in the enlarged cross-sectional view of FIG.
Since there is an air gap equal to the particle size of the mixture 11 on the butt joint surface between the core 12 and the type 1 core 12, the same magnetic properties can be ensured without inserting gap paper into the butt joint surface as in the past. It will be possible.

Effects of the Invention As described above, the present invention can ensure the same magnetic characteristics as when gap paper is inserted without inserting the gap paper that was inserted in each transformer, and also eliminates the gap paper insertion process. By eliminating this, it is possible to have an advantage over conventional transformers in terms of cost and compatibility.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the structure of an embodiment of the transformer of the present invention, FIG. 2 is a front view of the core butt joint of the present invention after assembly, and FIG. 3 is an enlarged sectional view of the same essential parts. , FIG. 4 is an exploded perspective view showing the structure of a conventional transformer. 7...X-type core, 8...Winding, 9...
...Bobbin, 10...Adhesive, 11...
...Mixture, 12...Type 1 core 0 Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
yA Figure 2

Claims (1)

[Claims] A transformer in which a coil is attached to a magnetic core that forms a closed magnetic circuit, and the core is fixed to the abutting surfaces of the core using an adhesive mixed with a mixture of arbitrary particle sizes for fixing the magnetic core.