JP4269760B2 - Arc welding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an arc welder.
[0002]
[Prior art]
The configuration of a conventional arc welder will be described with reference to FIGS. In the figure, 101 is a primary winding, 102 is also a primary winding, and 103 is a core around which the primary windings 101 and 102 are wound. (For example, see Patent Document 1)
Conventional arc welding machines, for example, in order to ensure the current capacity of the transformer winding or to obtain the flexibility of the winding in terms of production and to secure the cross-sectional area of the winding, Thus, a plurality of windings were formed.
[0003]
Further, as shown in FIG. 7, the transformer is divided into a plurality of wires and these windings are connected.
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 6-11330
[Problems to be solved by the invention]
In such a conventional arc welder, when a plurality of windings are configured in the transformer, a plurality of windings may be caused due to restrictions on arrangement due to the configuration of the equipment using the transformer, variation in winding length during assembly of the transformer, and the like. As the length of the windings changed, the inductance component of each winding varied.
[0006]
For this reason, an imbalance of the transformer current occurs between the plurality of windings, the heat generation between the plurality of windings varies, and only the windings with a large transformer current increase the winding cross-sectional area or The same winding with the increased cross-sectional area had to be used for the winding, which was problematic in terms of productivity and cost.
[0007]
An object of this invention is to provide the arc welding machine which solves the said subject.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, an arc welding machine of the present invention uses a transformer magnetically coupled through an air core magnetic element so that lead wires of a pair of windings are opposite to each other for welding power. is there.
[0009]
As a result, transformer current imbalance among multiple windings can be eliminated, and heat generation of the windings can be suppressed without unnecessarily increasing the winding cross-sectional area, improving transformer reliability and cost. Reduction is possible.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment)
Embodiments of the present invention will be described below.
[0011]
As shown in FIGS. 1 to 5, for example, a welding power transformer used in an arc welding machine including a primary winding 1 and a primary winding 2 will be described.
[0012]
A primary winding 1 and a primary winding 2 are wound around a core 3.
[0013]
The primary winding 1 drawn out from the core 3 is arranged so as to be magnetically coupled to the other primary winding 2 in a pair so as to be opposite to each other.
[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, transformer current imbalance among multiple windings can be eliminated, and heat generation of the windings can be suppressed without unnecessarily increasing the winding cross-sectional area, improving transformer reliability and cost. Reduction is possible.
[0016]
Here, the magnetic element 4 to be arranged may be of a toroidal shape or a square shape as long as it has an inductance component.
[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 elements is facilitated.
[0018]
Furthermore, although the primary winding has been described in the above configuration, the same applies to the secondary winding.
[0019]
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 circuit connected to the primary winding is common, or when the inverter circuits are separately independent.
[0022]
With such a configuration, as shown in FIGS. 5A and 5B, even when a transformer current imbalance occurs between a plurality of windings, the waveform of the rising portion of the transformer current due to the effect of magnetic coupling. Is averaged between the windings, and the transformer currents in the respective windings are 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 welder of the present invention eliminates transformer current imbalance among a plurality of windings in the transformer, and generates heat in the windings without unnecessarily increasing the winding cross-sectional area. By suppressing the above, there is an effect that the reliability of the transformer can be improved and the cost increase can be suppressed.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of an arc welder according to an embodiment of the present invention. FIG. 2 is an external explanatory view of a magnetic element in the arc welder according to an embodiment of the present invention. FIG. 4 is an explanatory diagram of a transformer used in an arc welder according to an embodiment of the present invention. FIG. 5 is an explanatory diagram of a transformer used in an arc welder according to an embodiment of the present invention. FIG. 6 is an explanatory diagram of a transformer used in a conventional arc welder. FIG. 7 is an explanatory diagram of a transformer used in a conventional arc welder.
1 Primary winding A
2 Primary winding B
3 Core 4 Magnetic element

Claims (6)

  An arc welding machine that uses a transformer composed of a winding and a core and magnetically coupled through an air-core magnetic element so that lead wires of a pair of windings are in opposite directions.   The arc welding machine according to claim 1, wherein a plurality of transformers are used.   Arc welding using a transformer composed of a winding and a core and magnetically coupled through the air-core magnetic element so that the lead wires of the pair of windings constituting the primary winding are opposite to each other. Machine.   A transformer composed of a winding and a core, which is magnetically coupled to the primary and secondary windings through the air-core magnetic element so that the lead wires of the pair of windings are opposite to each other. Arc welder used as   A transformer composed of a winding and a core, using a flexible winding such as a stranded wire, and a magnetically coupled transformer through the 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 welding power. The arc welding machine according to any one of claims 1 to 5, wherein a separate independent inverter circuit is connected to each of the pair of windings constituting the primary winding of the transformer.

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