JP2004322158A - Arc welding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an inductance component of each winding from deviating, which is caused by a variation of length of a plurality of windings due to locational restrictions related to a composition of equipment to use a transformer and a variation of winding length during assembly of a transformer, when the transformer is composed of a plurality of windings. <P>SOLUTION: In the arc welding apparatus, lead wires of a pair of windings for the transformer are composed by magnetically coupling them in the reverse direction each other, which eliminates an unbalance of transformer current among a plurality of windings and suppresses heat generation in the windings without enlarging the cross-sectional area of the winding needlessly, so that improvement in reliability of the transformer and constraint of cost increase can be achieved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an arc welding machine.
[0002]
[Prior art]
The configuration of a conventional arc welding machine will be described with reference to FIGS. In the figure, 101 is a primary winding, 102 is the same primary winding, and 103 is a core around which the primary windings 101 and 102 are wound. (For example, see Patent Document 1)
A conventional arc welding machine is used to secure the current capacity of a transformer winding or to secure the cross-sectional area of the winding in order to secure the cross-sectional area of the winding in terms of production flexibility. As described above, the winding is constituted by a plurality.
[0003]
Further, as shown in FIG. 7, the transformer is divided into a plurality of parts and these windings are connected.
[0004]
[Patent Document 1]
JP-A-6-11330 [0005]
[Problems to be solved by the invention]
In such a conventional arc welding machine, when a transformer is configured with a plurality of windings, a plurality of windings may be formed due to a restriction in arrangement due to a configuration of a device using the transformer, a variation in a winding length when the transformer is assembled, and the like. Since the lengths of the windings changed, the inductance components of the respective windings varied.
[0006]
For this reason, transformer current imbalance occurs between a plurality of windings, and heat generation among the plurality of windings fluctuates. For the winding, the same winding having an increased cross-sectional area has to be used, which is problematic in terms of productivity and cost.
[0007]
An object of the present invention is to provide an arc welding machine that solves the above problems.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, an arc welding machine according to the present invention uses a transformer in which lead wires of a pair of windings are magnetically coupled to be opposite to each other for welding power.
[0009]
As a result, it is possible to eliminate the imbalance of the transformer current among the plurality of windings, to suppress the heat generation of the windings without wasting the winding cross-sectional area, and to improve the reliability and cost of the transformer. Reduction is possible.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
(Embodiment)
Hereinafter, embodiments of the present invention will be described.
[0011]
As shown in FIGS. 1 to 5, for example, a transformer for welding power used in an arc welding machine including a primary winding 1 and a primary winding 2 will be described.
[0012]
The primary winding 1 and the primary winding 2 are wound around the core 3, respectively.
[0013]
The primary winding 1 pulled out of the core 3 is disposed so as to be magnetically coupled to the other primary winding 2 forming a pair so as to be in opposite directions.
[0014]
For example, as shown in FIGS. 1 and 2, the primary winding 1 and the primary winding 2 are arranged so as to pass through the air-core magnetic element 4 in opposite directions.
[0015]
As a result, it is possible to eliminate the imbalance of the transformer current among the plurality of windings, to suppress the heat generation of the windings without wasting the winding cross-sectional area, and to improve the reliability and cost of the transformer. Reduction is possible.
[0016]
Here, as long as the magnetic element 4 to be arranged has an inductance component, for example, the magnetic element 4 may have a toroidal shape or a rectangular shape.
[0017]
The winding may be a single wire, but if a stranded wire is used, the flexibility of the winding is improved and the arrangement of the magnetic element is facilitated.
[0018]
Further, in the above configuration, the primary winding has been described, but the same applies to the case of the secondary winding.
[0019]
Furthermore, it is also effective when the winding is wound around another leg of the same transformer.
[0020]
It is also effective when the winding is drawn from a plurality of transformers as shown in FIG.
[0021]
It is also effective when the inverter circuits connected to the primary winding are common or when the inverter circuits are separately independent.
[0022]
With such a configuration, even when the transformer current is unbalanced between a plurality of windings as shown in FIGS. 5A and 5B, the waveform of the rising portion of the transformer current due to the effect of magnetic coupling. Are averaged between the windings, and the transformer current in each winding is as shown in FIG. 5C, and the transformer current balance between the windings can be maintained.
[0023]
【The invention's effect】
As is apparent from the above description, the arc welding machine of the present invention eliminates transformer current imbalance among a plurality of windings in a transformer, and generates heat of the windings without wasting the winding cross-sectional area unnecessarily. Has the effect of improving the reliability of the transformer and suppressing the increase in cost.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of an arc welding machine according to an embodiment of the present invention; FIG. 2 is an explanatory view of the appearance of a magnetic element in the arc welding machine according to an embodiment of the present invention; FIG. FIG. 4 is an explanatory diagram of a transformer used in an arc welding machine according to an embodiment of the present invention. FIG. 4 is an explanatory diagram of a transformer used in an arc welding machine according to an embodiment of the present invention. FIG. 6 is an explanatory diagram of a transformer used in a conventional arc welding machine. FIG. 7 is an explanatory diagram of a transformer used in a conventional arc welding machine.
1 Primary winding A
2 Primary winding B
3 core 4 magnetic element

Claims (5)

An arc welding machine that uses a transformer composed of a winding and a core, and magnetically coupled to lead wires of a pair of windings in opposite directions to each other for welding power. The arc welding machine according to claim 1, wherein a plurality of transformers are used. An arc welding machine using a transformer composed of a winding and a core, and having a primary winding magnetically coupled to lead wires of a pair of windings in opposite directions to each other for welding power. An arc welding machine comprising a transformer composed of a winding and a core and having a primary winding and a secondary winding magnetically coupled to lead wires of a pair of windings in opposite directions to each other for welding power. A transformer composed of a winding and a core, using a flexible winding such as a stranded wire, and welding a transformer that is magnetically coupled with an air core magnetic element so that the lead wires of the pair of windings are in opposite directions to each other Arc welding machine used for electric power.

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