JP2019062144A - Transformer and manufacturing method thereof - Google Patents

Abstract

To provide a transformer that makes it easy to insert an iron core into a coil that is lying down.SOLUTION: A transformer includes a coil having an air gap in a substantially horizontal direction, a first support portion having an iron core wound around the coil and covering a bottom surface and a side surface of a portion of the iron core passing through the coil, a second support portion covering a bottom surface and a side surface of a portion of the iron core, which faces the portion of the iron core passing through the coil, a third support portion for supporting the lower side of the coil.SELECTED DRAWING: Figure 3

Description

  TECHNICAL FIELD The present invention relates to a transformer, and more particularly to a transformer with improved assembly workability.

  Conventionally, as shown in FIG. 3 of Patent Document 1, a method of assembling a transformer by inserting a coil into an upright iron core is known at the time of assembling the iron core and coil in a large capacity extra high amorphous transformer. ing.

JP, 2013-98349, A

  In an iron core laminated with amorphous ribbons described in Patent Document 1, since the rigidity is low, it is necessary to perform taping in order to be in an upright state. Furthermore, in the case of inserting the coil into the iron core, since the core lapping operation is performed at the upper end of the coil end face, there is a risk that fragments of the amorphous ribbon may get into the inside of the coil. Therefore, it is necessary to work carefully so that fragments of the amorphous ribbon do not enter the inside of the coil.

Besides the method of inserting the coil into the upright core, there is a method of inserting the core into the overturned coil. In that way
Another problem arises compared to inserting a coil into the above-mentioned upright core.

  In the case of inserting an iron core into a circular coil in the overturned state, the workability in the points (1) to (3) is poor. (1) The circular coil is inclined when the iron core is inserted. (2) Since the rigidity of the iron core is low, deflection occurs in the iron core and insertion is difficult. (3) Although the inner circumference of the coil is circular but the iron core is rectangular, it is not easy to place the iron core accurately.

  An object of the present invention is to provide a transformer in which an operation of inserting an iron core into a coil in an overturned state is facilitated, and a method of manufacturing the same.

  In order to solve the above problems, a preferred example of the present invention is a transformer having a coil having an air gap in a substantially horizontal direction and an iron core wound around the coil, and a portion of the iron core passing through the coil. A first support for covering the bottom and the side of the coil, a second support for covering the bottom and the side of the portion of the iron core opposite to the portion passing through the coil, and the lower side of the coil It is a transformer with three supports.

  According to the present invention, it is possible to obtain a transformer in which the operation of inserting the iron core into the coil in the overturned state is facilitated.

It is a figure which shows the circular coil installed in the support jig | tool regarding an Example. It is a figure which shows the iron core loaded in the square-C-shaped tray. It is a figure which shows the state which inserted the iron core of the 1st row into a round coil. It is a figure which shows the state which inserted the iron core in the circular coil and wrapped the iron core opening part. It is a figure which shows the state which inserted the iron core of the 2nd row into a round coil, and finished the wrapping operation. It is a figure which shows the cross section of FIG. It is a figure which shows the state which all the iron cores were inserted in a circular coil, and finished to lapping. It is a figure which shows carrying out the lapping operation | work of two iron cores at the same time. It is a figure which shows the iron core loaded in the square-shaped tray.

  Hereinafter, embodiments of the present invention will be described using the drawings.

  In order to prevent the rotation of the circular coil 4, as shown in FIG. 1, the circular coil 4 is disposed on the circular coil support jig 5, and the press board 6 is disposed on the lower inner periphery of the circular coil 4. In order to prevent the displacement of the press board 6, the circular coil 4 is fixed to a tape or the like having an insulating property. By arranging the press board 6, the bottom surface of the inner periphery of the circular coil 4 can be made flat, and the insertion of the rectangular iron core 2 (see FIG. 2) can be accurately performed.

  The iron core 2 is made of an amorphous material, and for example, an amorphous magnetic ribbon is laminated. A large current flows in the coil at the time of a short circuit accident of the transformer and a large electromagnetic mechanical force is generated. However, in a large capacity extra high amorphous transformer, deformation can be suppressed by increasing the strength of the coil itself by making the coil shape circular. . The upper surface of the circular coil support jig 5 has a curved surface shape that can be supported to the shape of the lower surface of the circular coil 4. By arranging the circular coil 4 on the circular coil support jig 5, the circular coil is inserted when inserting the iron core. It can prevent tilting.

  As shown in FIG. 2, the iron core 2 is placed on the U-shaped tray 7. By making the cross-sectional shape of the tray U-shaped, when the iron core is inserted, the iron core is prevented from falling outside due to its own weight. The U-shaped tray 7 is made of a material having insulation performance, and when using a non-insulation material such as iron, insulation processing is performed. By providing the insulation performance, it is not necessary to remove the tray from the inside of the coil even after the insertion of the iron core 2, and it becomes possible to assemble as a transformer as it is. In this case, since the rigidity of the coil itself is strengthened by the tray, the short circuit mechanical strength of the transformer can be improved.

  Further, the plate thickness of the U-shaped tray 7 is set to a thickness that can withstand the weight of the iron core. Further, the U-shaped tray 7 is constituted by four parts: a first supporting portion 7a1 of the U-shaped tray main body, a second supporting portion 7a2, and U-shaped tray tips 7b1 and 7b2. . Each component is connected with an insulating tape or the like until the insertion into the coil is completed.

  As shown in FIG. 3, the U-shaped tray 7 is inserted into the circular coil 4 while being placed on the U-shaped tray 7. At this time, an appendage 8 is installed at both ends of the opening of the circular coil 4 in advance. The iron core 2 and the U-shaped tray 7 are lifted and inserted using a lifting jig.

  By inserting the iron core 2 on the U-shaped tray 7, it is possible to prevent the lower end surface of the iron core 2 from rubbing against the press board 6 and cracking. In addition, due to the low weight and rigidity of the iron core, it is possible to prevent the occurrence of deflection that can not be inserted.

  After the iron core 2 is inserted, the U-shaped tray tips 7b1 and 7b2 can be removed to easily perform the lapping operation of the iron core opening. Since the siding due to the weight of the iron core can be prevented by installing the additional wood 8, the lapping work is further facilitated. Here, the lapping is to bond the both ends (both ends of the opening of the iron core) of a laminate of iron plates or amorphous ribbons formed by stacking the cut thin plate-like iron plates or amorphous ribbons. The joined core part is called a wrapping part.

  The state after the end of the lapping operation is shown in FIG. After the first row of iron core wrapping ends, the second row of iron core is inserted into the top of the first row of iron core to perform lapping work.

  The state where the lapping work of the second row of iron core is finished is shown in FIG. Further, a cross-sectional view thereof and an enlarged view of a portion of the U-shaped tray 7 are shown in FIG. As shown in FIG. 6, by making the height of the side surface of the U-shaped tray 7 higher than the height of the iron core 2, the weight of the iron core 2 of the second row is not applied to the iron core 2 of the first row. Can prevent the deterioration of

  FIG. 7 shows a state in which all the iron cores 2 are inserted into the circular coil 4 and wrapping is finished. By performing the wiring process of the circular coil 4 in the state of FIG. 7, it is not necessary to perform the work of inverting the circular coil 4 and the iron core 2 and making it upright, and the number of man-hours can be reduced. After wiring the circular coil 4, by putting the circular coil 4, the iron core 2, the circular coil support jig 5 and the attachment 8 into the tank as it is, the number of steps for removing the circular coil support jig 5 and the attachment 8 is reduced. It can be reduced.

  Further, the use of the press board 6 and the U-shaped tray 7 leads to the prevention of deformation of the iron core, so that the characteristics of the iron core can be improved (reduction of no-load loss). Furthermore, the strength around the iron core is improved, which also leads to an improvement in the short circuit mechanical strength of the transformer body. Also, by using the circular coil support jig 5 and the appendage 8, it is possible to prevent the transformer content assembly such as the coil and the iron core from moving during transportation or the like. As a result, it is possible to prevent a short circuit due to a displacement of the transformer content or a contact between the transformer tank and the content, and to improve the reliability of the product as a transformer.

  In Example 1, although the example of the iron core 2 of 2 rows was shown, the number of rows of the iron core 2 can be made into the iron core 2 of not only 1 row and 2 rows but multiple rows. By supporting the plurality of rows of iron cores 2 with the respective U-shaped trays 7, it is possible to improve the workability when inserting the plurality of rows of iron cores 2 into the coil.

  In Example 1, the core of the second row is inserted after the lapping operation of the core 2 of the first row, but as shown in FIG. 8, after the core of the first row is inserted, the core of the second row is inserted before performing the lapping operation. You may

  At this time, by inserting the iron core 2 into the circular coil 4 in the opposite direction as shown in FIG. 8, the openings of the iron core 2 do not overlap, so the lapping work for the first row and the second row Can be done simultaneously and work time can be shortened. Even when the number of iron core rows is two or more, the same effect can be obtained by staggering the insertion direction.

  In the first embodiment, the cross section of the tray is U-shaped, but may be U-shaped as shown in FIG. Also in this case, similarly to the U-shaped tray 7, it comprises four parts of a U-shaped tray main body 9a1, a U-shaped tray tip 9b1, a U-shaped tray main body 9a2 opposed to them, and a B-shaped tray tip 9b2. .

  In the case of a square shape, the wrapping operation (insulation processing) of the core portion of the iron core with the insulating paper is not necessary, and the workability is improved.

DESCRIPTION OF SYMBOLS 2 ... Iron core 4 ... Circular coil 5 ... Circular coil support jig 6 ... Press board 7 ... U-shaped tray 7a1, 7a2 ... U-shaped tray main body 7b1, 7b2 ... U-shaped tray tip 8 ... Awning 9 ... B Shape tray

Claims (11)

A transformer having a coil having an air gap in a substantially horizontal direction, and an iron core wound around the coil,
A first support portion covering a bottom surface and a side surface portion of a portion of the iron core passing through the coil;
A second support portion covering a bottom surface and a side surface portion of a portion of the core opposed to the portion passing through the coil;
A transformer comprising a third support for supporting the lower surface side of the coil. The transformer according to claim 1, wherein the iron core comprises an amorphous material. The transformer according to claim 1, wherein the iron core is a circular coil, and the transformer has a fourth support portion for supporting a wrapping portion forming one side of the iron core. The transformer according to claim 3, further comprising: a fifth support portion supporting the iron core at a lower portion of an inner periphery of the circular coil. The transformer according to claim 1, wherein a second iron core is stacked on the iron core, and a sixth of the transformer covers a bottom surface and a side portion of a portion of the second iron core passing through the coil. A transformer comprising: a support portion; and a seventh support member covering a bottom surface and a side surface portion of a portion of the second iron core that faces the portion passing through the coil. The transformer according to claim 5, wherein the heights of the first support portion and the second support portion are higher than the height of the iron core. The transformer according to claim 1, wherein the first support and the second support are formed of an insulating material. The transformer according to claim 7, wherein the first support portion and the second support portion have a cross-sectional shape of a square. What is claimed is: 1. A method of manufacturing a transformer, comprising: a coil having an air gap in a substantially horizontal direction; and an iron core wound around the coil,
Placing the coil on a first support that supports its lower surface;
The iron core is placed on a second support portion covering the bottom surface and the side surface portion of one side of the iron core, and a third support portion covering the bottom surface and the side surface portion of the other side of the iron core. A method of manufacturing a transformer, comprising inserting into the air gap of the coil. 10. The method of manufacturing a transformer according to claim 9, wherein the second support and the third support each have a removable tip, and the iron core is removed in a state in which the tip is removed. A method of manufacturing a transformer, comprising joining between the ends of The method of manufacturing a transformer according to claim 10, wherein the iron cores are formed of two upper and lower rows, the insertion directions of the respective iron cores are opposite to each other, and the lapping operation of the openings of the respective iron cores is performed in parallel. A method of manufacturing a transformer characterized in that it can.

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