JPS61115314A - Transformer - Google Patents

Abstract

PURPOSE:To obtain a low contact resistance of the same level as a soldered article without soldering, by affixing a projecting electroconductive substance of copper or the like to a copper-leaf tape. CONSTITUTION:A projecting electroconductive substance 11 of copper or the like, which is shaped in a cone, a semicolumn or the like, is fixed beforehand to an upper-layer copper leaf 6 of a lapping portion by soldering or the like in such a state that the contact resistance thereof is zero. The electroconductive substance 11 itself may be a solder. When the copper-leaf tape thus prepared is superposed, the electroconductive substance 11 contacts with a lower-layer copper leaf 6. The contact point thereof is firmly fixed in a physical manner from the surroundings by the adhesion of an adhesive for the copper leaves, and a low contact resistance of several milliohms is obtained. The height, outside diameter and width of the electroconductive substance 11 are set in optimum dimensions in accordance with the width and length of the lapping portion of the copper leaves.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transformer using a short ring for attenuating leakage flux.

Configuration of Conventional Example and its Problems First, a short ring in a conventional transformer will be explained with reference to FIGS. 1 to 6. In general, low frequency and high frequency transformers have a core (magnetic core) 3. It is assembled from 42 windings (coils) 6. Furthermore, the leakage flux (leakage magnetic flux) is
In order to reduce the
Two-turn short ring 1 is combined. The beginning and end of winding of this short ring 1 shown in FIG. 2 are fixed by soldering 2 as shown in FIGS. 3 and 4.
And soldering was done.

However, soldering has poor workability and takes a long time, contributing to high costs.

Also, if solder flux adheres to the copper surface, it may corrode, or the heat during soldering may cause damage to the bobbin.

There was a problem that adversely affected the winding.

In addition, as shown in Figures 6 and 6, in the case of a copper foil tape in which a non-conductive adhesive 8 is applied to a copper foil 6, the contact resistance will increase by several millimeters if it is simply pasted together. Ω is up to infinity, and when used as a short ring, soldering was always required. In addition, when using conductive adhesive, the cost is high and mass production is difficult.
It was inappropriate. Furthermore, as shown in FIGS. 7 to 9,
There is a method in which a convex portion 7 is formed on the upper layer copper foil 6 of the overlapped portion, and when the upper layer copper foil 6 is overlapped, it is brought into contact with and fixed to the lower layer steel foil 6.
Since the copper itself deforms, the contact point 9 becomes unstable and the contact resistance fluctuates, sometimes reaching infinity, and the soldering force (required).

There is also a method of machining the convex portion 7 not only in one place but in a plurality of places, but although the contact resistance is slightly lowered, soldering is still required.

In addition, if the length L of the overlapping part is usually about 6 to 10+ m, but if it is set to about 60 m, the contact resistance will decrease slightly, but the contact resistance will still fluctuate and may become infinite. Soldering is required.

Even if the length L of the overlapped part is further increased, it will not be completely
Contact resistance cannot be stabilized, soldering is required, and costs increase.

Another method, as shown in FIGS. 10 to 12, is to process burrings 7 on the upper layer steel foil 6 and have them contact and fix with the lower layer copper foil 6 when overlapped. Since the copper itself is deformed, the contact resistance can vary up to infinity, making soldering necessary. Furthermore, even if the burring 7 is processed not only at one location but at a plurality of locations, or even if the overlapping portion is increased, soldering is required as described above.

Purpose of the Invention In view of the above-mentioned problems, the present invention has been devised to solve the above problems by using a copper foil tape of about Σ211Ilv of about 0.1 x Σ211 lv without soldering, and after wrapping it around the contact point of the convex part of the molded part. The present invention provides a transformer having a short ring having a contact resistance of several milliohms by simply pressing the adhesive part.

Structure of the Invention In order to achieve the above object, the present invention fixes a convex conductive material such as copper to the upper layer of copper foil in the overlapping part, overlaps it, and then This transformer uses a short ring that can maintain a low contact resistance of several milliohms without soldering, using only the adhesive force of the adhesive on the copper foil surface when the adhesive part is pressed down.

DESCRIPTION OF EMBODIMENTS A short ring according to an embodiment of the present invention will be described below with reference to the drawings.

FIGS. 13 to 16 show 0 in the embodiment of the present invention,
There are many cross-sectional views and perspective views of copper foil tapes with a thickness of about 1-2 m. A conductive material 11 made of copper or the like having a convex shape such as a conical shape or a semi-cylindrical shape is attached to the upper layer copper foil 6 in the overlapped portion by soldering or the like.
It is fixed in advance in a state where the contact resistance is zero. The conductor 11 itself may be solder. When these copper foil tapes are overlapped, the conductive material 11 and the lower layer copper foil 6
contact, and the contact point is physically firmly fixed to the surrounding area by the adhesive force of the copper foil adhesive, resulting in a low contact resistance of several milliΩ. The height and outer diameter 1 width of the conductor 11 are set to optimal dimensions according to the width and length of the overlapping portion of the copper foil. Note that the number of conductors 11 may be plural.

Effects of the Invention As described above, the present invention has the advantage of attaching a conductive material such as copper having a convex shape such as a cone shape or a semi-cylindrical shape to a copper foil tape. When held down and firmly fixed, a low contact resistance of several milliohms, on the same level as soldered products, can be ensured without soldering, and the short ring can be easily attached to the transformer. In addition, since soldering work is no longer required, work time can be shortened and costs can be significantly reduced. Also, since no soldering is required, there is no discoloration of the steel surface, making it beautiful. Furthermore, since the contact point is completely covered by the surrounding adhesive, corrosion at the contact point does not progress.

[Brief explanation of drawings]

Fig. 1 is an external view of the transformer, Fig. 2 is a perspective view of a conventional short ring, Figs. 3 and 4 are perspective views and cross-sectional views of the overlapping part of the short ring, Fig. 6
Figure 6 is a sectional view showing the overlapping parts of copper foil tape with adhesive without and with soldering, and Figures 7 to 9 are copper adhesive tapes with convex contact parts at the overlapping part. 10 to 12 are perspective views and sectional views of a single-adhesive copper tape having a burring contact portion at the overlapped portion, and FIGS. 13 to 16 are views showing the implementation of the present invention. FIG. 2 is a cross-sectional view and a perspective view of a copper adhesive tape having a conductive material such as copper having a convex shape such as a conical shape or a semi-cylindrical shape in an overlapping portion in an example. 1...Short ring, 2...Solder, 3
... Core, 4 ... Bobbin, 6 ...
... Winding wire, 6 ... Copper foil, 7 ... Convex part,
8...Non-conductive adhesive, 9...Contact point, 1
0... Burring part, 11... Conductive material. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 Figure V%5 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] The short ring surface located on the outer circumferential surface of the coil has a convex conductor, and the short ring with adhesive can conduct electricity through the conductor by simply fixing it with adhesive without soldering. A transformer using a short ring that forms a loop.