JPH0729823U - Leakage transformer for AC arc welding machine - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the leakage transformer for AC arc welding machines. [Structure] Primary and secondary windings in which a coiled continuous multi-layer winding is performed on the iron core by tight winding by a vertical winding method using an insulated coated conductor of a rectangular conductor, and the start and end of the winding and the entire coil are taped. And an AC arc provided with a leakage magnetic path movable iron core provided in the middle of the primary and secondary windings, and an insulator for preventing coil deviation sandwiched between the outside of each of the windings and the core clamp. Leakage transformer for welding machines.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a leakage transformer for an AC arc welding machine.

[0002]

[Prior art]

 Conventionally, in a leakage transformer used in an AC arc welding machine, primary windings 3 and 4 and secondary windings 5 and 6 are arranged on a main iron core 1 with a movable iron core 2 serving as a leakage magnetic path interposed therebetween as shown in FIG. is doing. A circular coil in which a rectangular conductor is flatly wound is used for the primary winding and the secondary winding, and each winding is composed of 4 to 6 coils. These coils are supported in place so that they do not come into contact with the iron core.

In the above-described leakage transformer, the coil is conventionally supported by the structure shown in FIGS. 2 to 4. Here, FIG. 2 is a schematic diagram showing a conventional coil fixing method, FIG. 3 (a) is a plan view of the coil when the conventional fixing method is used, and FIG. 3 (b) is the same as FIG. It is a "AA" cross-section arrow line view. FIG. 4 is a schematic view showing another example of a conventional coil fixing method. In the coils shown in FIGS. 2 to 4, the insulating bolt 7 is passed through two or four positions of the disk-shaped coil 3, and several coils are tightened by using the insulator 8, the press fitting 9, and the nut 10, and the core is It is fixed to the fastener 14.

[0004]

[Problems to be solved by the device]

 In the prior art shown in FIGS. 2 to 4, the insulation bolt must be inserted between the layers in the middle of the winding work, or a gap for allowing the insulation bolt to pass must be provided. I couldn't do it, and winding work took time.

Further, when the bolt is tightened through the coil, it is necessary to adjust the bolt interval according to the position of the hole of the core fastener, so that the assembly work is very troublesome.

Further, since the adjacent coils are wound flatly and independently, it is necessary to connect the winding end of one coil and the winding start of the other coil by welding. It took time to stand up.

[0007] Furthermore, the manufacturing cost is inevitably high because the number of parts is large and the size of the coil is increased because the insulating bolt is passed through.

[0008]

[0009]

[Means for Solving the Problems]

 The present invention has been made to solve the above-mentioned problems. An L-shaped insulating spacer is applied to a corner portion of an iron core, and an insulating coating winding made of a rectangular conductor is closely wound on the spacer by a vertical winding method. Winding in a coil and continuous multi-layer winding, fix the winding start, winding end and the entire coil with tape, insert an insulator between the coil and the core clamp, and shift the coil outward. Is to prevent.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 5 shows one of the transformer coils of the present invention. FIG. 5 (a) is a plan view and FIG. 5 (b) is a sectional view taken along the line "BB" in FIG. 5 (a). is there. In FIGS. 5 (a) and 5 (b), the winding 3 is an insulating coated winding of a rectangular conductor on the L-shaped insulating spacers 11 mounted on the four corners of the yoke iron core 1a in a state where the winding is floated from the iron core. Wrap it vertically and stick it in the direction of the arrow in the figure. At the end of the winding of the first layer, the insulating sheet 15 is fixed to the corner portion of the first layer with tape. Next, the winding direction of the coil is reversed, and at the same time, the winding is mounted on the insulating sheet 15 and the second layer coil is wound on the first layer coil. At the end of winding of the second layer coil, the insulating sheet is sandwiched in the same manner as above to reverse the winding advance direction of the coil, and at the same time, the winding is mounted on the insulating sheet 15 so that the third layer is formed on the second layer coil. Roll the eye coil. In this way, one coil is manufactured by continuously winding the rectangular conductor wire. Next, another winding is wound around the yoke core 1a in the same procedure as the previous winding to complete the coil.

Next, in order to press the winding start end and the winding end end of the coil and prevent the coil from losing its shape, a tape 12 impregnated with a thermosetting resin is fixed around the coil by winding it around the coil as shown in FIG. To do. This tape is hardened by utilizing the heat when it is dried after impregnating the varnish after the transformer is assembled.

By the above-described method, two windings are completed on the upper and lower yoke iron cores 1a to form primary windings 3 and 4 and secondary windings 5 and 6, respectively. Next, as shown in FIG. 6, side iron cores 1b and 1b are assembled between the upper and lower yoke iron cores 1a and 1a. The iron core may be assembled by welding as usual, or may be fixed by bolting with a core fastener. After the main iron core 1 is assembled, the movable iron core 2 is assembled between the primary and secondary windings together with the movable iron core guide (not shown).

Here, in order to fix the core clamp and the coil to each other, as shown in FIG. 7, after the insulator 13 is sandwiched between the core clamp 14 and the coil 3 or 5, the core clamp is fixed. The method of fixing 14 to the iron core is adopted. FIG. 7 (a) is a diagram showing an embodiment of a support structure of the core clamp 14 and the yoke 1a around which the coil 3 is wound, and FIG. 7 (b) is a detailed cross-sectional view of the "C" portion of FIG. 7 (a). Is.

Here, the insulator 13 has a protrusion 131 and an L-shaped protrusion 132 as shown in FIG. Further, the core fastening metal fitting 14 has a cutout portion 141 that fits with the protrusion 131 of the insulator 13, and the projection portion 131 of the insulator is inserted into the cutout portion 141 of the core fastening metal fitting 14. By inserting the L-shaped protrusion 132 of the insulator 13 between the winding and the iron core, the insulator 13 is prevented from falling off and the coil is positioned in the outward direction. Since the insulator 13 only makes contact with the first layer of the coil, it can be used for any winding size by making it slightly larger than the largest width of the rectangular conductor wire used in the height direction. This can be done with the core fasteners.

[0015]

[Effect of device]

 As described above, according to the present invention, for example, what has conventionally been composed of 12 coils is composed of 4 coils, so that the welding connection between the coils can be reduced to 8 places and the manufacturing man-hour can be reduced. .

Further, when a current flows through the coil, only an attractive force acts between the adjacent conductive wires. Therefore, as in the present invention, the transformer coil may be closely wound in a vertical winding instead of the conventional flat winding. When wound, the coil does not move when a current flows. Therefore, in the present invention, in order to hold the winding start and end of the winding and prevent the coil from losing its shape, it is only necessary to tap the important points. It is not necessary to pierce the wire to assemble it firmly, which simplifies the winding assembly work and reduces the number of manufacturing steps.

Further, since it is not necessary to pass an insulating bolt between the windings in order to fix the coil and support the coil at a fixed position so as not to contact the iron core as in the conventional case, the coil can be downsized and the number of parts can be reduced. The number of man-hours and cost can be reduced.

The force acting on the coil during welding acts in a direction in which the primary coil 3 and the secondary coil 5 and the primary coil 4 and the secondary coil 6 repel each other. Therefore, as described above, the coil as a whole has sufficient resistance to the electromagnetic force generated when a sufficient current flows simply by sandwiching the insulator 13 between the core clamp 14 and the coils 3, 4, 5 and 6 to counter the outward force. Can endure. Therefore, it is not necessary to adjust the bolt interval according to the position of the hole of the core fastener as in the conventional case, and the number of assembling steps can be reduced.

Further, the tape 12, the L-shaped insulating spacer 11, the insulating sheet 15 and the like are made of an insulating material that can be easily processed, and as described above, the insulating material 13 is made of 1 regardless of the wire size of the rectangular conductor wire. Since it is possible to use different types and capacities, it is possible to use the same parts easily, which reduces the amount of material to be prepared and enables significant cost reduction. .

[Brief description of drawings]

 Figure 3 (a) shows

FIG. 1 is a diagram showing a configuration of a conventional leakage transformer.

FIG. 2 is a schematic view showing a conventional coil fixing method.

3A and 3B are views of a coil when a conventional fixing method is used, in which FIG. 3A is a plan view and FIG. 3B is a sectional view taken along the line AA of FIG. 3A. is there.

FIG. 4 is a schematic view showing another example of a conventional coil fixing method.

FIG. 5 is a diagram showing an embodiment of a winding according to the present invention,
The figure (a) is a front view, the figure (b) is "B-" of the figure (a).
It is a B "cross section arrow line view.

6A and 6B are diagrams showing an overall configuration of a leakage transformer of the present invention, wherein FIG. 6A is a front view and FIG. 6B is a side view of FIG.

7A and 7B are views showing an embodiment of a coil support structure of the present invention, in which FIG. 7A is a front view (part) and FIG. 7B is a “CC” cross section in FIG. 7A. It is an arrow view (part).

8A and 8B are views showing an embodiment of an insulator used in the present invention, in which FIG. 8A is a plan view and FIG. 8B is a side view.

[Explanation of symbols]

 1 main iron core, 1a yoke iron core, 1b side iron core, 2 movable iron core, 3, 4 primary winding, 5, 6 secondary winding, 7 insulating bolt, 8 insulator, 9 retainer, 10 nut, 11 L type insulation Spacers, 12 tapes, 13 insulators, 131 protrusions, 132 L-shaped protrusions, 14 core fasteners, 141 core fastener notches, 15 insulating sheets

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H01F 41/12 E

Claims (1)

[Scope of utility model registration request] 1. A primary and secondary winding in which a flat conductor is used as an insulation-coated wire and a continuous multi-layer winding is carried out on the iron core by close winding by a longitudinal winding method, and the winding start and winding ends and the entire coil are taped. Winding and the primary,
An AC arc welding machine equipped with a movable iron core for a leakage magnetic path provided in the middle of the secondary winding and an insulator for preventing coil deviation sandwiched between the outside of each winding and the core clamp. For leakage transformer.