JP2012138591A - Transformer for electric welder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer for an electric welder that has high operation efficiency and is easily manufactured.SOLUTION: A wound core 1 is wound around a winding arm of a primary winding coil 2, and thereby, an iron magnetic path is formed. In addition, a U-shaped secondary winding coil 5 that is wound once is slidably inserted into the wound core 1.

Description

  The present invention relates to a transformer for an electric welding machine that improves performance and reduces manufacturing costs.

  Electric welder transformers are classified into several types based on the difference in operation. One of them is a transformer for electric welders in which a control device can be connected to the input unit. Here, the control device adjusts the welding energization time and the welding intermittent cycle of the electric welding machine.

JP 2005-327911 A

  Since the electrical output capacity is expressed by current × magnetic flux amount, the transformer can be reduced in size or increased in capacity by increasing the magnetic flux amount. However, in the conventional transformer structure for electric welding machines, the magnetic path of the iron magnetic path is composed of the laminate of the EI type punched electromagnetic steel sheet, so the increase in the amount of magnetic flux is limited. There is a limit to the conversion.

  In addition, a transformer for an electric welding machine, in which a magnetic path of an iron magnetic path is composed of a laminate of EI type punched electromagnetic steel sheets, is formed with a predetermined number of electromagnetic coils after previously forming a primary winding coil and a secondary winding coil. It is manufactured by laminating steel sheets one by one on the iron magnetic path part, but this manufacturing method is unsuitable for mass production and it is difficult to reduce the manufacturing cost. Therefore, there is a demand for a method and configuration that can reduce manufacturing costs.

  Furthermore, in a transformer for an electric welding machine, the secondary winding coil is formed by winding a thick copper wire into a coil shape a plurality of times, which makes the process difficult and increases the manufacturing cost. The process of electrically insulating the copper wire becomes complicated, and this also increases the manufacturing cost.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a transformer for an electric welding machine that can be reduced in size / capacity and can reduce manufacturing costs. And

  In order to solve the above-described problem, the transformer for an electric welding machine of the present invention has an iron magnetic path made of a wound core. The present invention preferably has a winding coil, and one or a plurality of the wound cores are wound around the winding coil. The configuration of the present invention is formed as follows, for example. That is, the winding coil of this configuration includes primary and secondary winding coils, and after the primary winding coil is formed in advance, a winding core is wound around the primary winding coil. The core (iron core) can be assembled to the transformer, which facilitates the operation and reduces the manufacturing cost. In addition, the mounting structure of the core is simplified and the size and weight are reduced.

  In the present invention, the winding coil includes a primary winding coil made of a winding wire wound a plurality of times and a secondary winding coil made of a “U” -shaped lead wire having one turn. More preferably. According to this preferred aspect, by inserting the necessary “U” -shaped tips of the secondary winding coils into the central cylindrical space of the wound iron core previously attached to the primary winding coils, The entire transformer can be assembled, and the process is further simplified.

  In the transformer for an electric welding machine of the present invention having the above configuration, the following operational effects can be obtained. That is, the wound iron core has a magnetic performance with a low magnetic resistance and a high magnetic permeability as compared with an iron core made of an EI punched electromagnetic steel sheet. For this reason, when it is assumed that the coil winding is mounted on the same winding coil, the volume of magnetic flux generated in the wound iron core is larger than that in the iron core of the EI punched electromagnetic steel sheet, and the electric output can be increased. Therefore, the electrical output of the transformer for electric welding machine of the present invention becomes larger than that of the conventional transformer for EI punching type electromagnetic steel sheet electric welding machine, and as a result, the shape can be miniaturized. Furthermore, in the configuration of the present invention, the core loss of the wound core itself is small, and further, the number of turns of the primary winding coil can be reduced, so that the electrical resistance of the coil is reduced correspondingly and the copper loss is reduced. Thus, in the present invention, the operation efficiency of the transformer can be increased.

  In the transformer for a wound core type electric welding machine of the present invention, since a large current is required to flow, one or a plurality of “U” -shaped rectangular conductors of one turn are used as the secondary winding coil. Adopted. The “U” -shaped secondary winding coil facilitates the work of forming the shape and the electrical insulation treatment, and the heat dissipation conditions in the secondary winding coil section are good. Therefore, the heat radiation countermeasure process is simplified, and the manufacturing cost can be further reduced.

  In obtaining the above-described effects, the present invention preferably further has the following configuration. In other words, the wound iron wire is wound around the winding wire arm of the primary winding coil, and the secondary winding coil is inserted into the gap between the wound iron core and the winding wire arm. Specifically, the wound wire is wound around each of a pair of opposed winding arms that the temporary winding coil has, and the secondary winding coil extends from the coil end of the secondary winding coil. It is inserted in a gap between each of the pair of wound conductor arms and the wound core.

  In addition, when the required output electrical characteristics cannot be obtained with a single “U” -shaped secondary winding coil (the number of windings is 1), a plurality of the secondary winding coils are provided. What is necessary is just to connect the coil termination | terminus of each next winding coil with a short-circuiting copper piece, and to make it the number of required windings, and to increase the number of windings arbitrarily in the state which maintained the effect of the present invention mentioned above. Is possible.

  According to the present invention, compared with a conventional transformer for an EI electromagnetic steel sheet type electric welding machine, it has an effect of first reducing the manufacturing cost, and secondly, it is possible to reduce the size and weight. Furthermore, since it is possible to reduce no-load loss and copper loss by using a high-performance magnetic body as a wound core, it is possible to improve operating efficiency and bring about an energy saving effect. Become.

1 is a simplified diagram of a transformer for a wound core type electric welder according to the present invention. It is the schematic of the transformer manufacture procedure for a wound core type electric welding machine (1), Comprising: A primary winding coil is shown and the drawing before attachment of a wound core is represented. It is the schematic of the transformer manufacture procedure for a wound core type electric welding machine (2), Comprising: Drawing after a wound core attachment is represented. The “U” -shaped secondary winding coil is then slid and inserted, and the completed drawing has the shape shown in FIG.

  A structural drawing for realizing the present invention is shown in FIG. A winding coil composed of a primary winding coil 2 that has been formed a required number of times and a secondary winding coil 5 that has a “U” -shape and a single winding is used as a basic configuration. A total of four wound iron cores 1 are disposed on each of the long side portions (winding wire arms). Here, the winding coil long side portion (winding wire arm) is a winding coil formed in a long rectangular shape or an elliptical shape in plan view, and the long sides facing each other in the long rectangular shape (elliptical shape) are Show. In the present embodiment, a total of four wound iron cores 1 are arranged on each of the opposing winding coil long side portions (winding wire arms).

  The primary winding coil 2, the secondary winding coil 5, and the wound iron core 1 are assembled as follows. That is, after the wound iron core 1 is wound around the winding coil long side portion of the temporary winding 2 formed in advance, the secondary winding coil 5 is slid into the wound iron core 1 after being formed. The Specifically, after the primary winding coil 2 is formed in advance, the wound wire 1 is arranged in a shape to be wound around the winding coil long side portion (winding wire arm) of the formed temporary winding 2. The Further, the secondary winding coil 5 has a gap between the coil end, that is, the coil winding start / winding end 6, 7, between the winding core 1 and the winding coil long side portion (winding wire arm) of the temporary winding 2. 8 is inserted and arranged.

  FIG. 1 shows the best circuit configuration in which the present invention is implemented. Although FIG. 1 shows the case where the number of secondary winding coils 5 is one, when a plurality of secondary winding coils 5 are used, the end of each secondary winding coil 5 (coil winding start / end of winding). 6 and 7) are connected with a short-circuited copper piece, so that the required number of windings is configured.

  Next, as an embodiment of the present invention, a result of manufacturing a transformer for a wound core type electric welding machine having a single-phase 200V output capacity of 5 KVA, actually connecting a load, and measuring the characteristics will be described. . That is, as a result of the measurement, when a secondary current (1.75 KA, 2.56 KA, 3.30 KA) corresponding to the welding current is passed for a short time as a load condition, the wound core type electric welder of the present embodiment is used. The primary currents flowing through the transformer were 10.9A, 15.2A, and 18.7A, respectively. And at this time, it was confirmed that the temperature rise which arises in the transformer for wound iron core type electric welding machines is in the B class insulation temperature rise limit range.

  Since the transformer for a wound core type electric welding machine of the present invention can be reduced in size and weight and the manufacturing cost can be reduced and the operation efficiency is high, it is widely used and introduced in the industrial field dealing with transformers for electric welding machines. There is expected.

1 Winding core 2 Secondary winding coil 5 Secondary winding coil 6, 7 End of coil (coil winding start / end of winding)

Claims (6)

It has an iron magnetic path consisting of a wound iron core,
A transformer for an electric welding machine characterized by that. Have winding coils,
One or more wound cores are wound around the winding coil,
The transformer for an electric welder according to claim 1. The winding coil includes a primary winding coil made of a winding wire wound a plurality of times and a secondary winding coil made of a “U” -shaped lead wire with one winding.
The transformer for electric welding according to claim 2, wherein: The wound wire is wound around a winding arm of the primary winding coil,
The secondary winding coil is inserted in a gap between the wound core and the winding wire arm,
The transformer for an electric welding machine according to claim 3. The wound iron wire is wound around each of a pair of opposed wound wire arms that the temporary winding coil has,
The secondary winding coil is inserted into a gap between each of the pair of wound wire arms and the wound core from the coil end of the secondary winding coil.
The transformer for an electric welder according to claim 4. A plurality of the secondary winding coils are provided, and the coil ends of each of the secondary winding coils are connected with a short-circuited copper piece to obtain the required number of windings,
The transformer for an electric welding machine according to any one of claims 3 to 5, wherein the transformer is an electric welding machine.

Images