JP2001143945A - Transformer for arc welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the conversion efficiency of a transformer by improving the magnetic coupling between a primary winding and a secondary winding, and to increase the cooling efficiency of the primary winding and the secondary winding against heat generation. In addition, the core can be prevented from being damaged due to heat concentration on the center leg of the core, and the transformer can be expected to be downsized by reducing the winding cross-sectional area by connecting the windings on both sides of the core in parallel. Provided is a rational transformer for an arc welding machine capable of improving management efficiency by sharing materials of a primary winding and a secondary winding, improving characteristics, cooling efficiency and quality, and reducing the size of a transformer. SOLUTION: An insulator 7 is provided around both side legs of a core 6, and a primary winding A8, a secondary winding A9, a primary winding B10, and a secondary winding Bll wound around the periphery with insulating paper. Are wound in parallel in one layer and alternately at the same interval.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transformer for an arc welding machine mounted on an arc welding machine.

[0002]

2. Description of the Related Art In a conventional transformer for an arc welding machine, an insulator 2 is arranged around a core 1 as shown in a sectional view of FIG.
The primary winding 3 is wound therearound, and the secondary winding 5 is further wound via an insulator 4. In addition, FIG.
As shown in the cross-sectional view of FIG. 1, primary windings 3 and secondary windings 5 are alternately interdigitated with the center leg of a core 1 of an outer iron type having two E-shaped cores via an insulator 2. It was configured to be placed in.

[0003]

However, in the above-described conventional transformer for an arc welding machine, as shown in the cross-sectional view of FIG. When the primary winding 3 and the secondary winding 5 are wound via the insulator 4, the primary winding 3 and the secondary winding 5 have different cross-sectional areas, shapes and the number of windings, so that the windings are averaged. Is difficult to wind, the magnetic coupling between the primary winding 3 and the secondary winding 5 is deteriorated,
The conversion efficiency of the transformer was bad.

[0004] Further, the arc welding machine is forcibly air-cooled by a fan against heat generated by the transformer, and if the insulator 4 and the secondary winding 5 cover the periphery of the primary winding 3 as described above. In addition, there is a problem that the cooling efficiency of the fan with respect to the primary winding 3 that generates heat is deteriorated. Furthermore, since the transformer for an arc welding machine allows a large current of several tens of amperes to flow through the primary winding 3 and several hundreds of amperes through the secondary winding 5, the winding material to be used is copper or aluminum and the current is large. There is a problem that the material has a limited shape suitable for the primary winding 3 and it is difficult to share the primary winding 3 and the secondary winding 5 and management efficiency is poor.

A conventional transformer for an arc welding machine as shown in the sectional view of FIG. 6 is composed of a core 1 of an outer iron core formed by joining two E-shaped cores, and an insulator 2 , The primary winding 3 and the secondary winding 5 are arranged alternately and in the same row, so that the temperature is concentrated on the central leg of the core 1. For this reason, for example, when the core material is ferrite, when the both side surfaces of both side legs of the core 1 of the outer core are screwed with mounting brackets or the like, a difference in expansion caused by a temperature difference between the center leg and the both side legs causes There was a problem that the breakage of No. 1 occurred.

In the structure in which a winding is wound around the center leg of the E-shaped core, when it is desired to increase the number of turns by changing the specification of the transformer, the length of the core leg must be increased. Depending on the size, there is a possibility that the size may be increased, which is not suitable for downsizing the device.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a transformer for an arc welding machine that can improve conversion efficiency and cooling efficiency, can share windings, and can prevent breakage of a core.

[0008]

According to a first aspect of the present invention, there is provided a transformer for an arc welding machine in which insulators are arranged on both side legs of a core of an inner iron type formed by abutting both ends of a U-shaped core or an L-shaped core. A primary winding and a secondary winding, which are conductors having the same sectional area and the same shape, are arranged in parallel around the insulator, and the primary winding and the secondary winding are alternately and equally spaced. It is characterized by being arranged in such a manner.

According to the transformer for an arc welding machine according to the first aspect, the magnetic coupling between the core and the primary winding and the secondary winding is improved, so that the conversion efficiency of the transformer can be improved and the primary winding can be improved. And 2
Because the primary winding is exposed on the surface of the transformer,
The cooling efficiency against the heat generated by the secondary winding can be improved, and the management efficiency can be improved by using the same material for the primary winding and the secondary winding. Further, the winding is formed by abutting two U-shaped cores or two L-shaped cores. By wrapping the core on the both sides of the core, the heat is prevented from being concentrated on the center leg of the core, and the core is prevented from being damaged due to an increase in the temperature of the winding. Also, compared to the structure in which the winding is wound on the center leg of the E-shaped core, the structure in which the winding is wound on both sides of the core allows the number of windings of the winding to be doubled,
The number of windings can be increased without increasing the size of the core, and if the terminals of the windings on both sides of the core are connected in parallel, the windings will have twice the cross-sectional area. 1 area
/ 2, the height of the winding can be reduced, and the size of the transformer can be reduced.

As a result, it is possible to provide a rational transformer for an arc welding machine in which the characteristics, cooling efficiency, and quality are improved, and the core is not enlarged due to an increase in the number of windings.

A transformer for an arc welding machine according to claim 2 is
2. The method according to claim 1, wherein the primary winding and the secondary winding are set to have a predetermined winding ratio and a predetermined cross-sectional area by a combination of connection of a winding start and a winding end of each of the primary winding and the secondary winding. It is.

According to the transformer for an arc welding machine of the second aspect, in addition to the same effects as those of the first aspect, in addition to the N windings of the primary winding and the secondary winding as one set, the winding start and the winding start are performed. Construct the terminal part of the end of the winding, and by the combination of the connection of the terminal part,
Since it is an arc welding machine transformer that allows the turns ratio and winding cross-sectional area to be freely changed, simply changing the connection method of the terminal parts of the basic arc welding machine transformer will change the turns ratio and windings. It is possible to create many types of transformers for arc welding machines with different wire cross-sectional areas, and it can be expected to share materials and simplify manufacturing methods.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an external view of an embodiment of a transformer for an arc welding machine according to the present invention. FIG. 2 is a cross-sectional configuration diagram of an embodiment of the transformer for an arc welding machine according to the present invention.

As shown in FIGS. 1 and 2, the transformer for an arc welding machine according to the present invention comprises an insulator 7 around both legs of an inner iron core 6 formed by abutting both ends of two U-shaped cores. , A primary winding A8, a secondary winding A9, a primary winding B10, and a secondary winding using, for example, a rectangular conductor having the same material, the same shape and the same cross-sectional area wound with insulating paper. With Bll as one set, the primary windings and the secondary windings are alternately arranged at the same interval, that is, while keeping the pitch between the windings all the same,
Wound parallel to one layer. By this winding method, the primary winding A8 and the secondary winding A9, the secondary winding A9 and the primary winding B10,
Primary winding B10 and secondary winding Bll, secondary winding Bll and 1
Next winding A8 ... (repeated hereafter) is always (excluding terminal part)
It is configured to be adjacent.

Next, when the turns ratio of the primary winding to the secondary winding is 2:
The transformer is 1 and the cross-sectional area is primary winding: secondary winding 1:
2 is constructed. Here, assuming that the number of turns of each winding is 5 turns and the cross-sectional area is 10 mm ² , connection is performed as shown in FIG. 3, and the primary winding A winding end 16 and the primary winding B winding start 14 are connected. The number of turns of the primary winding is 10 turns, the cross-sectional area is 10 mm ² , the secondary winding A winding start 13 and the secondary winding B winding start 15 are connected, and the secondary winding A winding end 1
7 and the secondary winding B winding end 19 are connected, the number of turns of the secondary winding is 5 turns, and the cross-sectional area is 20 mm ² . Therefore,
The turns ratio of the primary winding to the secondary winding is 2: 1, and the cross-sectional area is 1: 2.
The transformer can be configured as follows.

The ratio of the number of turns of the primary winding to that of the secondary winding is 1:
The transformer is 1 and the cross-sectional area is primary winding: secondary winding is 1:
A transformer is configured to be 1. Here, assuming that the number of turns of each winding is 5 turns and the cross-sectional area is 10 mm ² , connection is performed as shown in FIG. 4, primary winding A winding start 12 and primary winding B winding start 14 are connected, The primary winding A winding end 16 and the primary winding B winding end 18 are connected, the secondary winding A winding start 13 and the secondary winding B winding start 15 are connected, and the secondary winding A winding end 1
When the winding 7 and the secondary winding B winding end 19 are connected, the number of turns of the primary winding is 5 turns, the cross-sectional area is 20 mm ² , and the number of turns of the secondary winding is 5 turns, and the cross-sectional area is 20 mm ² . Therefore,
The turns ratio of the primary winding to the secondary winding is 1: 1, and the cross-sectional area is 1: 1.
The transformer can be configured as follows.

In the above embodiment, the primary winding A8,
Four windings of the secondary winding A9, the primary winding B10, and the secondary winding B11 are configured as one set.
If N, such as two or sixteen, for example, an even number is formed as one set, other types of transformers for arc welding machines having different winding ratios and different winding cross-sectional areas can be configured.

Further, even if the number of places where the primary winding and the secondary winding are wound on both sides of the core 6 is increased to one place, two places,... M places (M is a positive integer), A transformer for an arc welder according to the embodiment can be configured.

Although the U-shaped core is used in the present invention, an L-shaped core may be used.

[0020]

According to the transformer for an arc welding machine of the first aspect, the core and the magnetic coupling between the primary winding and the secondary winding are improved, so that the conversion efficiency of the transformer can be improved. Since the windings and the secondary windings are exposed on the surface of the transformer, the cooling efficiency against heat generation of the primary windings and the secondary windings can be improved.
The management efficiency can be improved by sharing the material of the secondary winding and the secondary winding, and furthermore, the winding is wound on both sides of the inner iron core formed by joining two U-shaped cores or L-shaped cores. This prevents heat from concentrating on the center leg of the core and prevents damage to the core due to an increase in the temperature of the winding. Also, compared to the structure in which the winding is wound on the center leg of the E-shaped core, the structure in which the winding is wound on both sides of the core allows the number of windings of the winding to be doubled,
The number of turns can be increased without increasing the size of the core, and if the terminals of the windings on both sides of the core are connected in parallel, the windings will have twice the cross-sectional area. 1 area
/ 2, the height of the winding can be reduced, and the size of the transformer can be reduced.

As a result, it is possible to provide a rational transformer for an arc welding machine in which the characteristics, cooling efficiency, and quality are improved and the core is prevented from being increased in size due to an increase in the number of windings.

According to the transformer for an arc welding machine according to the second aspect, N windings of the primary winding and the secondary winding are set as one set to form the winding start and end terminals of the winding. Because it is a transformer for arc welding machine that can freely change the turns ratio and the cross-sectional area of the winding by combining the connection of the terminal parts, the basic method of connecting the terminal parts of the transformer for arc welding machine is By simply changing them, it is possible to create many types of transformers for arc welding machines with different turns ratios and different cross-sectional areas of windings, and it can be expected to share materials and simplify manufacturing methods.

[Brief description of the drawings]

FIG. 1 is an external view of a transformer for an arc welding machine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional configuration diagram of a transformer for an arc welding machine according to an embodiment of the present invention.

FIG. 3 is a circuit diagram of a transformer for an arc welding machine according to an embodiment of the present invention.

FIG. 4 is another circuit diagram of a transformer for an arc welding machine in one embodiment of the present invention.

FIG. 5 is a sectional configuration diagram of a transformer for an arc welding machine in a conventional example.

FIG. 6 is a cross-sectional configuration diagram of a transformer for an arc welding machine in another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core 2 Insulator 3 Primary winding 4 Insulator 5 Secondary winding 6 Core 7 Insulator 8 Primary winding A 9 Secondary winding A 10 Primary winding B 11 Secondary winding B 12 Primary Start of winding A winding 13 Start of winding secondary winding A 14 Start of winding of primary winding B 15 Start of winding of secondary winding B 16 End of winding of primary winding 17 17 End of winding of secondary winding A 18 Primary winding End of winding B 19 End of secondary winding B

Claims (2)

[Claims] An insulator is disposed on both side legs of a core of an inner iron type formed by abutting both ends of a U-shaped core or an L-shaped core, and a conductor having the same sectional area and the same shape is provided around the insulator. A primary transformer and a secondary winding are arranged in parallel in one layer, and the primary winding and the secondary winding are alternately arranged so as to be at the same interval. vessel. 2. The primary winding and the secondary winding having a predetermined turn ratio and a cross-sectional area are set by a combination of connections at the beginning and end of each of the primary winding and the secondary winding. Item 7. The transformer for an arc welding machine according to Item 1.