JPS6376308A - One-turn coil - Google Patents

Abstract

PURPOSE:To simplify the structure and to facilitate the manufacture as well as to realize the miniaturization in such a way that a jacket is installed on the face of a terminal-conductor located at a part where an open-edge part surrounds the end face of an angle-pipe-like conductor. CONSTITUTION:Angle-pipe-like conductors 21, 21 ...2n and insulating sheets 31, 32 ...3n are mounted through slender angular holes which are made at terminal-conductors 41 and 42 and are soldered to these terminal-conductors. Therefore, the ends of the angle-pipelike conductors 21, 22 ...2n are connected to each other by the terminal-conductors 41 and 42, but an eddy current does not flow to other parts because insulating sheets are sandwiched between them. An open-edge part of jackets 51 and 52 is soldered to a part which surrounds the edge faces of angle-pile-like conductors 21, 22 ... 2n. If a coolant is fed from a coupler 5b at the jacket 51, the coolant flows through the angle-pipe-like conductors 21, 22 ...2n and is discharged from a coupler 5b at the jacket 52. Through this constitution, the structure of a one-turn coil can be simplified and it is possible to realize the miniaturization.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a transformer suitable for, for example, an electric resistance welding machine, and particularly to an all-wound coil used as a secondary winding.

(Prior Art) Generally, electric resistance welding machines include AC resistance welding machines and DC resistance welding machines, and both of these machines are equipped with a transformer that obtains electric power from a commercial power source and steps down the voltage of the electric power.

In recent years, with the advancement of industrial robots, there has been a trend to mount not only welding guns but also transformers on robots, and for this reason there has been a strong demand for transformers to be as lightweight as possible.

When it comes to reducing the weight of transformers, there are limits to methods that output power at commercial frequencies, and for this reason converters are often used that use power converters to convert alternating current to audible frequencies and then step down the voltage.

On the other hand, in resistance welding, a current of 10,000 amperes or more must be supplied to the welding part, so it is recommended to use a so-called -turning coil with one turn as the secondary winding of the transformer. At the same time, it was necessary to increase the substantial cross-sectional area and to provide forced cooling to prevent heat generation.

It should be noted that this coil has a relatively large cross-sectional area.
When using a real conductor or one with a large cross-sectional area made by twisting a large number of thin conductors, the alternating current at an audio frequency flows only on the surface of the conductor due to the skin effect, making it appear difficult to The area will be reduced, increasing power loss and heat generation.

However, the secondary winding of this type of conventional transformer is
A single-wound coil is made by connecting multiple strip-shaped conductors in parallel, each having a brazed copper pipe through which the coolant flows, or by connecting multiple copper pipes in parallel, each of which conducts the coolant and is itself a conductor. It was used.

(Problems to be Solved by the Invention) The above-described conventional single-turn coil has a complicated structure, is difficult to manufacture, and is large in size.

The present invention has been made in order to solve the above-mentioned problems, and aims to provide a single-wound coil that can be simplified in structure and manufactured, and can also be downsized.

(Means for Solving the Problems) The present invention provides a plurality of rectangular pipe-shaped conductors that are sequentially wound and laminated around a transformer core through insulating members, and whose ends face each other at predetermined intervals, and It consists of a pair of terminal conductors that are electrically connected by penetrating the ends of square pipe-shaped conductors in common, and a box with a liquid circulation hole formed in the wall, and the opening edge is connected to the square pipe. It is characterized by comprising a jacket that is fixed to each terminal conductor surface of a portion surrounding the end of the shaped conductor.

(Function) When connecting a plurality of conductors in parallel to form a single-turn coil, for example, if a strip-shaped conductor with a rectangular cross section and a cooling pipe fixed to it is used, the configuration becomes complicated. Furthermore, if a copper pipe with a circular cross section is used, it is difficult to overlap the pipes, and it is also difficult to interpose an insulating member to prevent eddy current from flowing between the pipes.

Therefore, in the present invention, square pipe-shaped conductors are bent and formed to a size that surrounds the transformer core, and are sequentially laminated with an insulating member interposed therebetween, so that the ends thereof are aligned and facing each other at a predetermined interval.

In this case, the square pipe-shaped conductors must be connected in parallel with each other, so for example, connect each end of the square pipe-shaped conductor to a pair of terminal conductors in which an elongated square hole is formed. plug and electrically interconnect.

In addition, it is necessary to forcibly cool the winding coil by some method, but in this case, the opening edge of the box with liquid circulation holes formed in the wall is connected to the end of the square pipe-shaped conductor. Each terminal is equipped with a jacket that is fixed to the terminal conductor surface surrounding the terminal.

According to such a configuration, the configuration is simpler than that of a configuration in which the cooling pipe is fixed to the strip-shaped conductor, and it is easier to perform overlapping winding and insertion of insulators, which are difficult to do with circular pipes.
Furthermore, compared to circular pipes, the overall shape can be made smaller to the extent that they can be laminated more densely.

Further, according to the above configuration, a coil with uniform ends can be easily formed by winding the square pipe-shaped conductor and the tape-shaped insulating member in a spiral shape and cutting off a portion in the circumferential direction. Workability can be significantly improved.

(Example) Hereinafter, the present invention will be explained with reference to the drawings. Figure 1(a),
(b) and (c) are a sectional view and a side view showing the configuration of an embodiment of the present invention, and FIGS. 2(a) and (b) are enlarged sectional views showing the detailed configuration of the main part. be.

In each of these figures, a square pipe-shaped conductor 21. 22. ....

2n are sequentially laminated with insulating sheets 31, 32, . . . , 3n interposed therebetween. In this case, the square pipe-shaped conductor 21.22
．． ..., 2n and insulation sheet 31°32, ...
3n have ends aligned and facing each other at intervals. These square pipe-shaped conductors 21, 22, . . . , 2n and insulating sheets 31, 32, . ....

The ends of the terminal conductors 41 and 3n are inserted into elongated square holes formed in the terminal conductors 41 and 42, respectively, and are brazed to these terminal conductors. Therefore, the square pipe-shaped conductor 21,
22. ..., 2n are interconnected at their ends by terminal conductors 41 and 42, but an insulating sheet is interposed between them, so that eddy currents do not flow elsewhere.

In addition, here, square pipe-shaped conductors 21, 22. ...+2
Copper material as n, insulation sheet) 31.32. ..., 3n
A glass sheet is used for each.

In addition, square pipe-shaped conductors 21, 22 . . . , jackets 51 and 52 are fixed to the terminal conductor surfaces on which the end surfaces of the terminals 2n and 2n are located, respectively.

The jackets 51 and 52 are formed into a box shape, and have liquid circulation holes 5a in their walls, and coverrs 5b are welded thereto. And jacket 51.
The opening edge of 52 is a square pipe-shaped conductor 21. 22. ...
, 2n are brazed to the parts surrounding the end faces.

In this way, when the cooling liquid flows from the cover 5b of the jacket 51, these cooling liquids flow through the square pipe-shaped conductors 21, 22.
..., flowing through 2n, Kabra 5 of jacket 52
It is discharged from b.

FIGS. 3(a) to 3(e) are explanatory diagrams showing the manufacturing process of the single-wound coil shown in FIGS. 1 and 2. First, as shown in FIG. A laminated coil 10 is formed by overlapping a conductor 11 and a tape-shaped insulating sheet 12 and winding the coil a plurality of times to a size that allows a transformer core to be inserted therein. In this case, it is wound so that the winding start end T1 and the winding end T2 are on the same side. Next, the same figure (b)
As shown in FIG. 2, the laminated coil 10 is partially cut away in an area including the winding start end T1 and the winding end T2 so that the ends of the square pipe-shaped conductor are aligned and facing each other at intervals.

Next, as shown in Figure (C), the terminal conductors 41 and 42 having the elongated square holes 4a are fitted into the ends of the square pipe-shaped conductors and brazed, respectively. ), and then, as shown in Figure (C), the edges of jackets 51 and 52 having liquid flow holes 4a and coverrs 4b were shaped as shown in Figure (e). As shown, the terminal conductors 41 and 42 are brazed to allow cooling fluid to flow to the square pipe-shaped conductors.

In this way, a set of coils with aligned ends can be manufactured extremely easily, and costs can be reduced accordingly. Furthermore, since the single-turn coil thus formed is flat as shown in FIG. 1(C), it becomes easy to downsize the transformer itself.

FIG. 4 shows an example of the configuration of a transformer using a single-turn coil according to the present invention, in which a single-turn coil 62A as a secondary coil is sandwiched between primary coils 61A and 61B in the center leg of an outer iron core 1. Another single-wound coil 62B is mounted between the primary coils 61C161D, and the terminal conductor 41 of the single-wound coil 62A and the terminal conductor 41 of the single-wound coil 62B are connected to each other. are connected by a connecting fitting 63.

In this case, the secondary coils 61A, 61B, 61C and 6
1D are connected in series to generate in-phase magnetic flux.

FIG. 5 is an electrical connection diagram of the transformer shown in FIG. 4, and includes the above-mentioned primary coils 61A and 61B.

Primary coil 6 formed by connecting 61C1 and 61D in series
1 is applied with an audible frequency alternating current voltage. On the other hand, - wound coil 61A.

The mutual junction points of 61B are led out to the outside as negative terminals, and the anodes of rectifiers 64 and 65 are connected to their other ends, and the cathodes of these rectifiers 64 and 65 are interconnected and led out to the outside as positive terminals. be done.

In this way, a two-phase rectifier-connected transformer is constructed with the mutual connection point of the wound coils as the neutral point, and electrical resistance welding using audio frequency alternating current is performed in the same way as applying commercial frequency alternating current. It will be done.

〔Effect of the invention〕

As is clear from the above description, according to the present invention,
- There is an excellent effect that the structure of the wound coil can be significantly simplified, manufacturing can be facilitated, and the whole can be miniaturized.

[Brief explanation of the drawing]

FIGS. 1(a), (b), and (c) are cross-sectional views and side views showing the configuration of one embodiment of the present invention, and FIG. 2(a),
(b) is an enlarged sectional view showing the detailed structure of the main part of the same embodiment, FIGS. 3(a) to (e) are explanatory diagrams showing the manufacturing process of the same embodiment, and FIG. FIG. 5 is a side view showing an example of the configuration of the installed transformer, and FIG. 5 is an electrical connection diagram of the transformer. 1... Transformer core, 21-2n... Square pipe-shaped conductor, 31-3n... Insulating sheet, 41.42... Terminal conductor, 51.52... Jacket. Applicant's agent Sato -Yu Ako (C) Man I Figure 1 (a) (b) Yu Figure 2 is also 4 Figures combined Figure 5

Claims (1)

[Claims] They are sequentially wrapped and laminated around the transformer core through insulating members,
A plurality of square pipe-shaped conductors whose ends face each other at predetermined intervals, a pair of terminal conductors through which the ends of these square pipe-shaped conductors are commonly penetrated and electrically connected, and a wall portion. The one-time winding device is characterized in that it is a box body in which a liquid circulation hole is formed, and a jacket whose opening edge is fixed to each terminal conductor surface of a portion surrounding the end surface of the square pipe-shaped conductor. coil.