JPWO2015121943A1 - Winding method of multi-line multi-stage coil for transformer and multi-line multi-stage coil for transformer - Google Patents

Abstract

Transformer capable of preventing deformation of the outer rectangular wire due to the difference between the inner and outer circumferences of the rectangular wire when two or more rectangular electric wires arranged in a horizontal direction are coiled while being rolled. Provided is a winding method for a multi-stage multi-stage coil. When two or more flat electric wires 20 are arranged in a horizontal direction and coiled while simultaneously rolling in a horizontal plane, two or more flat electric wires 20 arranged in a horizontal direction are coiled in a horizontal plane. The feed amount of the rectangular wire 20 on the outside is made larger than the feed amount of the flat wire 20. Thereby, when two or more flat electric wires 20 arranged in a horizontal direction are coiled while being rolled, an inner and outer peripheral difference is generated between the inner flat electric wire 20 and the outer flat electric wire 20. However, since the feed amount of the outer flat electric wire 20 is larger than the feed amount of the inner flat electric wire 20, it is possible to prevent the outer flat electric wire 20 from being deformed or worn.

Description

  The present invention relates to a winding method for a transformer multi-wire multi-stage coil used in a molded transformer in which a plurality of wires are wound into a multi-stage coil, and a transformer multi-wire multi-stage coil.

  Conventionally, as a multi-stage coil for a transformer used in a molded transformer, a winding device in which two or more rectangular wires are stacked in multiple stages in the vertical direction and wound, and the transformer manufactured by the winding device A dexterous multi-wire multi-stage coil is provided.

  When multiple flat wires are stacked in a disk shape in multiple stages, stacked in a cylindrical shape and wound into a coil, multiple flat wires supplied individually from the supply section are The electric wire portion that becomes a curved portion when the disk is wound is rolled and formed in a superposed state in which the electric wires are stacked in multiple stages in the vertical direction.

  The rectangular electric wire that has exited the formed part is then sent to the laminated part. In the laminated part, if the rectangular electric wires are in a free state where they are not bundled together, each rectangular electric wire breaks down during lamination. End up. Since it is very difficult to laminate and wind in that state, it takes a lot of time to adjust the shape of the broken flat electric wire, which takes a lot of time, and the multistage coil results in an expensive product. End up.

  Therefore, it is necessary to bind the rectangular electric wires before they are supplied to the laminated part. To bundle the rectangular electric wires in a multi-layered state in the vertical direction, bind the rectangular electric wires with tape or the like. There are also other binding means such as adhesives or caulking. By binding with such means, two or more rectangular electric wires are formed and wound as if they were one flat electric wire. Therefore, it is possible to eliminate the correction work for adjusting the shape of the winding, and to manufacture the product as an inexpensive product.

  For rectangular electric wires wound in a disc, the final winding shape is generally a rectangular coil type or a circular coil type, and a multi-stage coil is manufactured by winding a rectangular electric wire proposed by the present applicant into a rectangular shape. The apparatus is disclosed in Patent Document 1 and Patent Document 2.

  The multi-stage coil manufacturing apparatus disclosed in Patent Document 1 and Patent Document 2 is a state in which a supply unit capable of individually supplying a flat wire and two or more flat wires are stacked in multiple stages in the vertical direction and constrained A constraining part to be removed, a leveler part for removing wrinkles of the constrained rectangular electric wire, a feeding part that actively sends the flat electric wire in accordance with the winding shape, and a flat electric wire facing each other in the plate thickness direction. A pair of rolling rollers that are sandwiched and rolled, a stock unit that receives the rolled rectangular electric wire, and a rolling roller control unit that controls the sandwiching angle of the rolling roller are provided. And, for example, when two or more rectangular electric wires are formed into a rectangular coil shape, the forming of the curved portion that becomes the corner of the rectangular electric wire and the straight portion that becomes the side is repeated, and the outer periphery from the inner peripheral side. By gradually increasing the radius of curvature when winding to the side, gradually decreasing the radius of curvature when winding from the outer peripheral side to the inner peripheral side, and parallel rolling with the rolling roller in parallel at the moment of entering the straight portion from the curved portion By forming the straight portion and making the cross-sectional area of the straight portion substantially equal to the cross-sectional area of the innermost peripheral curved portion, a rectangular multistage coil is efficiently and automatically manufactured.

JP 2009-277914 A JP 2010-245169 A

  As a conventional technique, a single wire or two or more flat electric wires are stacked up and down in a vertical direction and have been developed, and a winding technique for a molded coil up to 1000 kVA has been established. However, when winding a molded coil of a large model of 1500 kVA or more, a winding method in which multiple layers are stacked in the vertical direction is adopted, and this method increases floating loss, which may cause an increase in coil size and deterioration of characteristics. . As a solution, a technique for winding two or more rectangular electric wires in parallel in the left-right direction and winding them is required.

  By the way, when two or more flat electric wires are bundled with a tape or the like in the up and down direction and wound, when the flat electric wire is wound on a disk, the electric wire portion that becomes a curved portion is rolled and formed, but is overlapped in the up and down direction. Since the part is rolled from the side direction, the dimensions of the overlapping flat electric wires after rolling are equal to each other, and therefore can be handled as one flat electric wire.

  However, when two or more flat electric wires are arranged in the horizontal direction that is the horizontal direction and rolled from the arranged direction, the dimensions of the inner flat electric wire and the outer flat electric wire, which are the curved parts, are different. A circumferential difference will occur. Therefore, when the restraint force of the rectangular wires arranged in the left-right direction is strengthened, the distance of the curved portion of the outer rectangular wire becomes longer than the distance of the inner rectangular wire, and the cross-section of the outer rectangular wire after rolling forming There is a problem that the shape is thinly deformed and the characteristics deteriorate.

  Moreover, when the restraint force by the rolling of the rectangular wires arranged in the left-right direction is weak, a deviation or the like occurs in the flat wire due to the weak restraint force, and the bound tape or adhesive is removed. Further, since the friction due to the difference between the inner and outer circumferences of each rectangular electric wire inside and outside occurs during the rolling forming, it is sometimes difficult to perform the rolling forming in the left-right direction in a state of being bound by a tape or the like. However, when winding two or more flat wires in multiple stages, if a bundling means such as tape or adhesive is not applied, when the flat wires are sent to the laminated part after rolling, a constrained flat wire Since it is necessary to automatically bind the rectangular wires at some timing after rolling forming, etc., development of rolling forming technology that can solve these problems Is essential.

  The present invention has been made in view of the above problems, and when winding two or more flat wires arranged side by side in the horizontal direction while coiling while rolling, an inner flat wire and an outer flat wire further than that Although there is a difference between the inner and outer circumferences, even if the inner and outer circumference differences occur, the winding method of the multi-wire multi-stage coil for transformers that can be wound without deformation in the outer rectangular wire, and the winding method is used. An object of the present invention is to provide a multi-wire multi-stage coil for a transformer.

  In order to solve the above-mentioned problem, an invention relating to a winding method for a multi-wire multi-stage coil for a transformer is such that two or more rectangular wires are arranged in a horizontal direction and coiled while simultaneously rolling in a horizontal plane, and 2 in the horizontal direction. When winding the rectangular wires arranged side by side in a coil in a horizontal plane, the feeding amount of the outer rectangular wire is made larger than the feeding amount of the inner rectangular wire.

  In addition, the invention related to the multi-wire multi-stage coil for transformers is arranged such that two or more rectangular wires are arranged in the horizontal direction and coiled while simultaneously rolling in a horizontal plane, and two or more rectangular wires arranged in the horizontal direction are arranged, When winding in the shape of a circular coil in a horizontal plane, the feed amount of the outer rectangular wire is made larger than the feed amount of the inner flat wire, and two or more rectangular wires arranged in the horizontal direction are arranged in a circular coil shape. Bundled in the vicinity of the upstream side of the means for winding.

  In addition, the invention related to the multi-wire multi-stage coil for transformers is arranged such that two or more rectangular wires are arranged in the horizontal direction and coiled while simultaneously rolling in a horizontal plane, and two or more rectangular wires arranged in the horizontal direction are arranged, When winding a rectangular coil in a horizontal plane, the feed amount of the outer rectangular wire is made larger than the feed amount of the inner rectangular wire, and two or more rectangular wires arranged side by side in the horizontal direction are simultaneously moved by the same amount of movement. When the rectangular wire that is linearly fed is wound in a rectangular coil shape in a horizontal plane, the feed amount of the outer rectangular wire is increased more than the feed amount of the inner rectangular wire, and the horizontal direction Two or more rectangular wires arranged side by side are bound in the vicinity of the upstream side of the means for winding and forming into a rectangular coil shape.

  The effect of the present invention is that when two or more rectangular wires arranged in a horizontal direction are coiled while being rolled in a horizontal plane, there is a difference between the inner and outer periphery between the inner rectangular wire and the outer rectangular wire. However, it is possible to prevent the outer rectangular wire from being deformed or worn by increasing the feeding amount of the outer rectangular wire more than the feeding amount of the inner rectangular wire.

  Further, when two or more rectangular wires arranged side by side in the horizontal direction are wound into a coil while being rolled, they are bound in the vicinity of the upstream side of the means for winding into the coil. Thereby, it is possible to prevent the flat wires that are bundled and formed in multiple stages in a coil shape from being broken.

It is a schematic bird's-eye view which shows the Example of the multistage coil winding apparatus for transformers which winds the flat electric wire arrange | positioned along with the horizontal direction in a horizontal plane. It is a schematic diagram which shows the Example of the multistage coil winding apparatus for transformers which coil-winds the flat electric wire arrange | positioned by arranging two in the horizontal direction and two in the up-down direction. It is explanatory drawing which shows the winding method which coil-winds the flat electric wire arrange | positioned by arranging two horizontally. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the shape of the rectangular electric wire roll-formed by the multistage coil winding apparatus for transformers, (a) shows what rolled the rectangular electric wire arranged in the up-down direction, (b) is horizontal. FIG. 2C shows a product obtained by rolling and forming the arranged flat electric wires, and FIG. 5C shows a product obtained by rolling and forming the flat electric wires arranged in the vertical direction and the horizontal direction. It is a bird's-eye view which shows the multi-line multi-stage coil for transformers manufactured with the multi-stage coil winding device for transformers, (a) shows what was coiled in the shape of a rectangular coil, and (b) was coiled in the shape of a circular coil Shows things. It is a bird's-eye view which shows an example of the multi-line multi-stage coil for transformers manufactured with the multi-stage coil winding device for transformers, (a) shows what was coiled in the shape of a rectangular coil, and (b) is a coil in the shape of a circular coil It shows what is wound. It is a bird's-eye view which shows an example of the multi-line multi-stage coil for transformers manufactured with the multi-stage coil winding device for transformers, (a) shows what was coiled in the shape of a rectangular coil, and (b) is a coil in the shape of a circular coil It shows what is wound.

  First, the structure of the multistage coil winding device for a transformer according to the present invention will be described below.

  FIG. 1 shows a multi-stage coil winding device for a transformer, in which two or more flat wires arranged in a horizontal direction are coiled while being rolled in a horizontal plane to produce a multi-wire multi-stage coil for a transformer. b) shows the one formed by rolling with the transformer multi-stage coil winding device.

  FIG. 2 shows a multi-stage coil winding device for a transformer for producing a multi-wire multi-stage coil for a transformer by rolling a rectangular electric wire arranged in the vertical direction in addition to the horizontal direction while rolling the coil. And FIG.4 (c) has shown what was roll-formed with the said multistage coil winding apparatus for transformers.

  The multi-stage coil winding device for a transformer shown in FIGS. 1 and 2 has a supply unit 1 that can individually supply a plurality of flat wires 20 and the like that are wire members.

  Furthermore, as the supply part of the electric wire member, it is preferable to provide a horizontal supply part 2 and a vertical supply part 3 as shown in FIG. 1, and a cross-sectional shape of the flat electric wire 20 or a coil winding. The horizontal supply unit 2 and the vertical supply unit 3 can be switched or used together in accordance with the taking system.

  The multi-stage coil winding device for a transformer has a leveler unit 4 for removing wrinkles of the flat electric wire 20 supplied from the supply unit 1, and corrects the straight electric wire 20 to be straightened by correcting bending or twisting. Thus, it is possible to wind up without gaps.

  The multi-stage coil winding device for a transformer shown in FIG. 1 has a switching mechanism 5 so that the rectangular electric wire 20 supplied from the supply unit 1 can be quickly switched. It is possible to quickly cope with the replacement of the flat electric wire 20 due to the change.

  The multi-stage coil winding device for a transformer shown in FIGS. 1 and 2 has a plurality of feeding mechanism sections 6 that can match the rectangular electric wire 20 supplied from the leveler section 4 to the coil shape and feed an appropriate amount. Yes. As shown in FIGS. 3 (b) and 3 (c), the feeding mechanism section 6 adjusts to the difference between the inner and outer circumferences when forming a plurality of flat electric wires 20 in a multi-stage arrangement in the left-right direction. It is possible to control to increase the feed amount of the rectangular wire outside.

  Further, as shown in FIG. 3, when sending a plurality of the flat electric wires 20 to be stacked and formed in multiple stages in the vertical direction, as shown in FIG. It is preferable that there is an up-and-down direction restraining mechanism 7 for restraining the rectangular electric wires 20 stacked in a plurality of stages in the up-down direction. Moreover, as a feeding method of the feeding mechanism unit 6, the feeding mechanism unit 6 has two feeding hands so that the rectangular electric wire 20 can be continuously fed, and the hand performs an operation of changing the rectangular electric wire 20 and alternately moving back and forth. Thus, it is possible to send the flat electric wire 20 with less stagnation time. Instead of the hand, it is also possible to adopt a belt drive type in which the flat electric wire 20 is sandwiched from both sides with a belt shape, the belt is rotated, and the flat electric wire 20 is continuously sent out.

  The transformer multi-stage coil winding apparatus shown in FIGS. 1 and 2 arranges the two or more rectangular electric wires 20 supplied from the feed mechanism 6 in the horizontal direction, and therefore, the wire width guide is arranged downstream of the feed mechanism 6. Part 8 is provided. Two or more horizontally arranged flat electric wires 20 arranged between the feeding mechanism 6 and the forming portion 9 provided on the downstream side of the electric wire width guide portion 8 are moved by the electric wire width guide portion 8. It is possible to guide. In addition, the electric wire width guide part 8 can each guide the rectangular electric wire 20 with an individual feed amount corresponding to the difference between the inner and outer circumferences of the two or more horizontally arranged flat electric wires 20. Moreover, the said shaping | molding part 9 rolls and shape | molds the flat electric wire 20, rolling a circular coil shape or a rectangular coil shape.

  Here, a description will be given of a supply method in which two or more flat electric wires 20 are stacked in multiple stages in the vertical direction. In this case, the rectangular electric wires 20 are already laminated and restrained before the feeding mechanism 6 and can be fed out as if they were one rectangular electric wire 20. It is even better if it is possible to guide the laminated and constrained rectangular electric wires 20 to be laminated in multiple stages in the vertical direction by the electric wire width guide portion 8.

  Moreover, the multistage coil winding apparatus for transformers shown in FIGS. 1 and 2 has a left-right direction restraining mechanism 10 as means for binding two or more flat wires 20 arranged in the left-right direction. The left-right direction restraining mechanism 10 is disposed immediately upstream of the molding portion 9 and immediately before the molding portion 9. When the rectangular electric wire 20 is wound in a rectangular coil shape, two or more rectangular electric wires 20 are formed. The two or more flat electric wires 20 are bound by the flat electric wire binding tape 17 at a timing before being fed linearly.

  The timing for binding the flat wire 20 is the flat wire 20 in the middle of passing through the right and left direction restraining mechanism 10 at the time when the coil forming is finished, and while the straight portion 15 of the flat wire is being sent, Since it is not affected by the difference between the inner and outer peripheries of the two or more flat wires 20 arranged at a position that does not reach the R-shaped portion 16 that is curved after being sent, it can be bound.

  Further, as a mechanism of the forming portion 9 for winding and forming the flat electric wire 20 in a circular coil shape or a rectangular coil shape, it is preferable to perform roll forming so as to gradually form a desired curve by a roll forming method. The rectangular electric wire 20 can be formed with a desired curve by individually controlling each of the rollers.

  In the multi-stage coil winding device for a transformer shown in FIG. 1, when the flat electric wire 20 is formed into a circular coil shape or a rectangular coil shape, the flat electric wire 20 fed linearly is not bent or caught. It has a receiving mechanism 11 for preventing it. The receiving mechanism 11 may be provided with means for binding the flat electric wires 20 that are molded or sent linearly. In that case, the mechanism is a mechanism capable of bundling both the vertically stacked layers or the flat electric wires 20 arranged in the left and right directions, and the vertical restricting mechanism 7 and the right and left restricting mechanism 10 are not necessary. In the case of binding, it is necessary to follow the flat rectangular electric wire 20 after being formed and bind it while preventing breakage, so that the mechanism and the control are complicated, and the cost of the apparatus itself is increased. Further, since there is a possibility that the flat electric wire 20 may be broken before being restrained, a separate guide mechanism for the flat electric wire 20 is sufficient.

  1 and 2, the transformer multi-stage coil winding apparatus includes a winding die for winding a flat electric wire 20 wound by the forming portion 9, a winding shaft 12, and a flat angle sent by the forming portion 9. It has a winding follow-up unit 13 that rotates in front and rear, right and left, and in the molding direction according to the electric wire 20.

  The multi-stage coil winding device for a transformer shown in FIGS. 1 and 2 further has a coil receiving portion 14 that follows the amount of the flat electric wire 20 wound by winding and operates in the vertical direction. While the flat electric wire 20 is being wound by the portion 14, it is possible to prevent the flat electric wire 20 from being deformed by its own weight.

  The multi-stage coil winding device for a transformer shown in FIGS. 1 and 2 is constrained in a state where a plurality of rectangular electric wires 20 are stacked in the vertical direction or arranged in the horizontal direction, and rolled into a rectangular coil shape or a circular coil shape. It is molded and wound in multiple stages from the inside to the outside and from the outside to the inside. However, if the winding die and the winding shaft 12 are actively wound, the rectangular electric wire 20 is deformed. In practice, stacking is performed on the stacking portion 21 shown in FIG. 2 so that no external force is applied.

  In addition, as a means for bundling two or more flat electric wires 20 in the transformer multi-stage coil winding apparatus shown in FIG. 1 or FIG. 2, a tape or the like is good, and there are other bundling methods such as an adhesive. The material of the means may be a material that can withstand the characteristics when the flat wire 20 becomes a coil, such as paper or an insulator. In addition, when the flat electric wire 20 is not damaged and there is no increase or decrease in the cross-sectional area of the flat electric wire 20 at the time of winding forming by the forming portion 9, a bundling means that caulks may be used.

  6 and 7 show a rectangular electric wire 20 configured as a multi-wire multi-stage coil for a transformer obtained by coiling the rectangular electric wire 20 into a coil shape by the transformer multi-stage coil winding device shown in FIG. 1 and FIG. The state bound using the flat wire binding tape 17 is shown. Moreover, FIG. 5 has shown the state which does not bind the flat wire 20 of the multi-wire multistage coil for transformers.

  Since the flat wire binding tape 17 is thick in material itself, it is desirable that the flat wire 20 is as thin as possible so as not to increase the stacked height 18, 18A, 18B, 19, 19A, 19B of the stacked flat wires 20. However, as shown in FIG. 6, even when the flat electric wire 20 is bundled with the thin flat electric wire binding tape 17, the flat electric wire binding tape 17 is concentrated at the same phase position (four phase positions in the figure) in each winding. If it does, the stacking height 18A, 19A of the flat electric wire 20 will become high, and there exists a problem that a coil height increases.

  Therefore, in order to keep the coil height as low as possible, as shown in FIG. 7, when the flat wire 20 is laminated and the laminated portion 21 is formed, the flat wire binding tape 17 is in the same phase position of the disk winding. In order not to concentrate, it is preferable to manufacture while controlling the position where the flat wire bundling tape 17 is attached by a restraining mechanism. Thereby, the lamination | stacking heights 18 and 19 at the time of binding the flat electric wire 20 with the flat electric wire binding tape 17 can be suppressed as much as possible.

  Here, the winding method when coiling the flat electric wires 20 arranged in the horizontal direction from the multi-stage coil winding device for transformer shown in FIG. 1 will be described with reference to FIG. In addition, in FIG. 3, about the flat electric wire 20 arranged in the horizontal direction, an inner flat wire is shown below and the outer flat wire is shown above.

  When the transformer multi-stage coil winding apparatus is operated, the two rectangular electric wires 20 are linearly fed at the same speed as shown in FIG.

  Next, as shown in (b), when coil winding of the two flat electric wires 20 is started, the outer flat electric wires 20 are fed at a higher speed than the feed speed of the inner flat electric wires 20.

  Next, as shown in (c), the two rectangular electric wires 20 are rolled simultaneously by the forming portion 9 in a state where the outer rectangular electric wires 20 are fed at a speed higher than the feeding speed of the inner rectangular electric wires 20. While being bent into a predetermined shape, the upstream side of the bent portion, which is located in the vicinity of the bent portion, is bound by the flat wire binding tape 17 immediately after that. When the two flat electric wires 20 are bent while being simultaneously rolled, as shown in (c), the inner forming roller and the outer forming roller formed in the forming portion 9 for simultaneously rolling the two flat electric wires 20. The position control is performed such that the roller moves in the traveling direction of the flat wire 20.

  Next, when the bending of the two flat electric wires 20 and the binding of the two flat electric wires 20 with the flat electric wire binding tape 17 are finished, the inner forming roller and the outer forming member moved in the traveling direction in (c). The roller for use returns to the original position by being retracted, and the two rectangular electric wires 20 are linearly fed again at the same speed.

  Then, as shown in (e), the series of operations shown in (a) to (d) is repeatedly performed, so that the two rectangular electric wires 20 are coiled into a rectangular coil shape, thereby transforming A dexterous multi-wire multistage coil is manufactured.

  According to the winding method of the flat electric wire 20 used as a multi-wire multi-stage coil for a transformer as described above, two or more flat electric wires 20 are arranged in the horizontal direction and coiled while being simultaneously rolled in a horizontal plane. When two or more flat electric wires 20 arranged in the direction are wound in a coil shape by the forming unit 9 in a horizontal plane, the feed amount of the outer flat wire 20 is made larger than the feed amount of the inner flat wire.

  Further, two or more flat rectangular wires 20 arranged side by side are wound into a rectangular coil shape or a circular coil shape while being rolled by the forming portion 9. In the right and left direction restraining mechanism 10, two or more flat electric wires 20 arranged side by side are bound using a flat electric wire binding tape 17 in the vicinity of the molding portion 9.

  Therefore, when two or more flat wires 20 arranged in the horizontal direction are coiled while being rolled in a horizontal plane, there is an inner / outer circumference difference between the inner flat wire 20 and the outer flat wire 20 outside it. However, it is possible to prevent the outer flat electric wire 20 from being deformed or worn by increasing the feed amount of the outer flat electric wire 20 relative to the feed amount of the inner flat electric wire 20.

  Furthermore, when two or more flat wires 20 arranged in the horizontal direction are wound in a coil shape while being rolled, they are bound in the vicinity of the upstream side of the forming portion 9 which is a means for forming the coil shape. . Thereby, it can prevent that the flat electric wire 20 shape | molded by the coil shape in multiple stages | steps will fall apart.

DESCRIPTION OF SYMBOLS 1 ... Supply part 2 ... Horizontal installation part 3 ... Vertical installation part 4 ... Leveler part 5 ... Switching mechanism 6 ... Feed mechanism part 7 Vertical direction restraint mechanism 8 Electric wire width guide part 9 Forming part 10 Left / right direction restraint Mechanism 11 ··· Receiving mechanism 12 ··· Winding and winding shaft 13 · Winding follow-up unit 14 · Coil receiving portion 15 · Linear portion 16 · R molded portion 17 · Flat wire binding tape 18, 18A, 18B · Stacking height ( Rectangular shape)
19, 19A, 19B ... Stack height (circular shape)
20. Flat wire (flat wire)
21 .. Laminate part

Claims (4)

Two or more flat wires are arranged in the horizontal direction and coiled while simultaneously rolling in a horizontal plane,
Transformer characterized in that, when two or more flat wires arranged in the horizontal direction are coiled in a horizontal plane, the feed amount of the outer flat wire is made larger than the feed amount of the inner flat wire. Winding method for multi-stage multi-stage coils for dexterity. In the winding method of the multi-wire multistage coil for transformers according to claim 1,
A winding method for a multi-wire multi-stage coil for a transformer, characterized in that two or more flat wires arranged in a horizontal direction are bound in the vicinity of the upstream side of a coil-shaped winding means in a horizontal plane. Two or more flat wires are arranged in the horizontal direction and coiled while simultaneously rolling in a horizontal plane,
When winding two or more rectangular wires arranged in the horizontal direction into a circular coil in a horizontal plane, the feeding amount of the outer rectangular wire is increased more than the feeding amount of the inner rectangular wire,
A multi-wire multi-stage coil for a transformer, characterized in that two or more flat wires arranged side by side in the horizontal direction are bundled in the vicinity of the upstream side of a means for winding and forming a circular coil. Two or more flat wires are arranged in the horizontal direction and coiled while simultaneously rolling in a horizontal plane,
When winding two or more rectangular wires arranged in the horizontal direction into a rectangular coil shape in a horizontal plane, the feeding amount of the outer rectangular wire is increased more than the feeding amount of the inner rectangular wire,
Two or more rectangular wires arranged side by side in the horizontal direction are simultaneously linearly fed with the same movement amount,
When winding the linearly fed rectangular wire into a rectangular coil shape in a horizontal plane, the feeding amount of the outer rectangular wire is increased more than the feeding amount of the inner rectangular wire,
A multi-wire multi-stage coil for a transformer, characterized in that two or more flat wires arranged side by side in the horizontal direction are bundled in the vicinity of the upstream side of a means for winding and forming a rectangular coil.

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