JP2015228476A - Coil device and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a low loss and space saving square coil that is downsized by making a gap between coil turns smaller and a manufacturing method of the same without increasing the number of steps and facility cost.SOLUTION: A coil device including a square coil 2 mounted around a columnar core 31 having a square cross section is so configured that hollows are formed in advance at side edge parts of parallel lines with a crushing jig, and each corner part 33 of the columnar core 31 is storable in a circular recessed part 23 formed with a bending jig so that a hollow forming part comes on an inner circumferential side.

Description

  The present invention relates to a coil device used for a reactor coil for an in-vehicle device, and more particularly to a rectangular coil device in which a rectangular wire is wound edgewise and a manufacturing method thereof.

  Coil devices such as reactor coils and toroidal coils are generally configured by winding a coil around a rectangular block-shaped core (iron core). As a conventional coil shape, a cylindrical shape in which a rectangular wire is wound edgewise is known. However, a gap is easily formed between the core and the core, and loss tends to occur. There is a problem that the peripheral side swells and the thickness of the stack tends to increase.

  Therefore, coil shapes other than a cylindrical shape have been proposed in view of the demand for a compact and highly efficient coil device, and there is a rectangular shape obtained by winding a wire along a core. For example, Patent Document 1 includes a cylindrical vertically wound coil wound spirally around a core center leg, and each coil is a continuous strip-shaped conductor plate having a substantially rectangular cross section. A formed coil device is disclosed. The conductor plate is bent a plurality of times on the back side or the front side at an angle other than parallel and perpendicular to the direction of current flow.

  When the flat wire is bent in one direction so as to have a spiral structure, the bent portion is folded and the thickness is doubled, and the bending R is considered to be twice or more, and the stacked dimension is required to be twice or more the number of turns. . In order to solve this problem, the shape may be adjusted by pressure welding and rolling. However, since the interval between the coil turns is controlled by the pressure welding rate, it is not easy to ensure the uniformity of the coil lamination interval. On the other hand, the coil apparatus of Patent Document 1 employs a construction method in which the conductor plate is bent at the same time on the back side or the front side at least once in one turn of the coil. Even without, it is possible to adjust to a constant narrow coil interval.

JP 2013-21307 A

  However, the coil device of Patent Document 1 has a configuration in which a gap corresponding to the thickness of a flat wire is formed between the coil turns, and there is a limit to the reduction of the stacked dimensions. In addition, the bending operation is complicated, and not only a bending equipment capable of three-axis operation is required, but also an insulation coating treatment is required on the outer surface of the coil after processing, which tends to increase the manufacturing cost.

  Therefore, the present invention provides a space-saving rectangular coil configuration that reduces the size by reducing the gap between the coil turns, and does not increase the number of processes and equipment costs, and a manufacturing method thereof. The purpose is to realize a small and high performance coil device at low cost.

The invention described in claim 1 of the present invention
A coil device having a columnar core having a rectangular cross section and a rectangular coil mounted around the columnar core,
The rectangular coil is formed by edgewise winding a rectangular wire in a rectangular shape along the outer peripheral surface of the columnar core, thereby connecting a plurality of straight portions parallel to each side of the columnar core and a plurality of adjacent straight portions. And a concave portion capable of accommodating each corner portion of the columnar core by recessing a part of the inner peripheral surface of the flat wire forming each corner portion toward the outer peripheral surface side. Is provided.

  According to a second aspect of the present invention, the concave portion is formed by crushing a side edge portion of the rectangular wire in advance to form a recess, and bending so that the recess is on the inner peripheral surface side. Is formed.

  According to a third aspect of the present invention, the flat wire is an insulation-coated wire, and the concave portion is formed by bending the arc-shaped formation portion of the recess so as to surround the corner portion of the columnar core. It is formed in an arc shape.

Invention of Claim 4 of this invention is a manufacturing method of the coil apparatus of Claim 1, Comprising:
A first step of forming a recess by crushing one side edge of a flat wire of constant thickness using a crushing jig;
A second step of forming the recessed portion by bending using a bending jig so that the formation portion of the depression is on the inner peripheral side,
The first step and the second step are sequentially repeated while feeding the flat wire, thereby performing edgewise winding in a predetermined rectangular shape.

Invention of Claim 5 of this invention is a manufacturing method of the coil apparatus of Claim 4,
The crushing jig has a pair of movable molds and a stationary mold which are horizontally opposed to each other, and has a feed groove for supporting the rectangular wire on the upper surface of the stationary mold, and a pushing portion provided in the movable mold. Is pushed into the side edge of the rectangular wire to crush and process the recess.

Invention of Claim 6 of this invention is a manufacturing method of the coil apparatus of Claim 4 or 5,
The bending jig has a pair of movable molds and a fixed mold that are horizontally aligned, and has a feed groove that supports the rectangular wire on the upper surface of the movable mold and the fixed mold, and the side of the feed groove. Using the pin member arranged in the direction as a bending fulcrum, the recess forming portion is bent to form the recessed portion.

The invention according to claim 7 of the present invention is the method of manufacturing a coil device according to any one of claims 4 to 6,
The crushing jig or the bending jig includes a pressing member that suppresses the bulging of the rectangular wire during crushing or bending.

  In the coil device according to the present invention, since the concave portion capable of accommodating the core corner portion is formed on the inner peripheral surface of the corner portion of the rectangular coil, the core volume that can be accommodated can be increased. In addition, since the stacking height can be reduced, the product can be reduced in size and performance. Such a coil device can be continuously edgewise wound on one axis by flattening and bending of a rectangular wire, so that it can be easily manufactured using an insulation-coated wire, and is effective for cost reduction.

It is sectional drawing of the reactor coil in 1st Embodiment of this invention. It is the whole reactor coil perspective view in a 1st embodiment. It is the perspective view and top view of a square-shaped coil in 1st Embodiment. It is the top view of the rectangular coil in 1st Embodiment, and its principal part enlarged view. It is a principal part enlarged view of the flat wire which comprises the rectangular coil in 1st Embodiment. It is a principal part enlarged view of the square-shaped coil in 1st Embodiment. It is a general | schematic process drawing for demonstrating the manufacturing method of the square coil of 1st Embodiment. It is a principal part enlarged view for demonstrating the manufacturing method of the rectangular coil of 1st Embodiment. It is a whole block diagram of the apparatus for manufacturing the square-shaped coil of 1st Embodiment. In the manufacturing apparatus of FIG. 7, it is a whole perspective view which shows the state before a bending process. In the manufacturing apparatus of FIG. 7, it is a whole perspective view which shows the state after a bending process. It is a principal part perspective view for demonstrating the detailed structure of the crushing jig in the manufacturing apparatus of FIG. 7, and the procedure of a crushing process. It is a principal part perspective view for demonstrating the detailed structure of the bending jig in the manufacturing apparatus of FIG. 7, and the procedure of a bending process. It is a figure for demonstrating the effect of this invention by comparing with the former, and is a top view of the square coil of 1st Embodiment and the conventional square coil.

  A first embodiment to which the present invention is applied will be described in detail with reference to FIGS. 1 and 2, a reactor coil 1 that is a coil device includes a rectangular coil 2 and a magnetic core 3, and the magnetic core 3 has a columnar core 31 around which the rectangular coil 2 is mounted. Yes. A wide flange-like core 32 is integrally provided at the end of the columnar core 31 in the axial direction, and protrudes in the side surface direction of the rectangular coil 2 so that the whole is substantially I-shaped. The magnetic core 3 is usually manufactured by a known method. For example, a magnetic core laminated with a general-purpose magnetic material such as a magnetic steel plate, or a dust core (powder magnetic core) formed by mixing a resin binder with iron-based magnetic metal powder and press-molding the magnetic core 3 is used. Can be used. The magnetic core 3 may be configured by combining a plurality of divided cores. Moreover, it can be set as the arbitrary core shape according to a product and a required characteristic in combination with the other division | segmentation core which is not illustrated.

  As shown in FIG. 3, the rectangular coil 2 is an edge formed by spirally winding a wire made of a flat conductor having a certain thickness (hereinafter referred to as a flat wire) so that each step has a substantially square shape. The whole is formed in the shape of a rectangular tube coil by the width winding. As the flat wire, an insulating coated wire previously coated with an insulating material can be used, and as described later, an insulating treatment after the winding process can be omitted, which is desirable. Both end portions of the rectangular coil 2 become terminal portions 2A and 2B and extend upward in the figure. As shown in FIGS. 1 and 2, the columnar core 31 of the magnetic core 3 is fitted in the cylinder of the rectangular coil 2, and the flange-shaped cores 32 at both ends close the opening at both ends of the rectangular coil 2. Yes.

  The rectangular coil 2 has four straight portions 21 parallel to each side of the columnar core 31 and four corner portions 22 connecting the adjacent straight portions 21. The straight portion 21 functions as a cooling surface of the rectangular coil 2 and releases heat generated by the coil. The corner portion 2 is formed into a shape having a curved outer peripheral surface without corners by bending a flat wire, and smoothly connects the straight portions 21.

  Here, in the present invention, a part of the inner peripheral surface of each corner portion 22 is crushed to provide the recessed portion 23 that accommodates the corner portion 33 of the columnar core 31. The recessed portion 23 is arc-shaped, and the side surface of the flat wire facing the four corner portions 37 of the columnar core 31 is crushed so as to be pushed from the inner peripheral side to the outer peripheral side of the corner portion 22 to provide a recess, It is formed by bending. This facilitates edgewise winding of the flat wire and facilitates the insertion and insertion of the columnar core 31, and arranges the four corners 33 in a space surrounded by the arcuate edges of the corresponding recesses 23. To do. At this time, the gap between each side of the columnar core 31 and the adjacent straight portion 21 can be minimized, and the cross-sectional area of the columnar core 31 accommodated in the cylinder of the rectangular coil 2 can be maximized. it can.

  In the present invention, the shape of the recessed portion 23 is not particularly limited as long as the corner portion 33 of the columnar core 31 is acceptable. Preferably, it is desirable that the inner and outer peripheral surfaces of the corner portion 22 of the rectangular coil 2 have an arc shape. As shown in FIG. 4A (right figure), the inner and outer peripheral surfaces of the corner portion 22 may be set to have a substantially concentric arc shape, and the rectangular wire width of the corner portion 22 is secured to suppress the heat generation of the coil. Easy to bend and bend easily. Further, the radius of curvature of the outer peripheral surface of the corner portion 22 can be reduced, and the length L of the straight portion 21 can be increased to the same extent as the length of one side of the columnar core 31.

  4B and 4C, a state in which a depression 24 that becomes a concave portion 23 of the corner portion 22 is formed in a straight rectangular wire 25 before bending, and this is processed using the center C of the concave portion 23 as a bending fulcrum, The state which formed the recessed part 23 is shown. When the indentation depth 23 of the corner portion 22 and the indentation depth of the depression 24 (distance from the edge of the flat wire) is P and the radius of curvature is R, these P and R are shown in FIG. 4 (left figure). Is set based on the relationship shown in FIG. That is, when the columnar core 31 is arranged so that the corner 33 of the columnar core 31 is in contact with the bottom (arc center) of the recess 23 and the cross-sectional area of the columnar core 31 is maximized, the maximum of the corner 33 and the recess 23 is maximized. The distance is P. When the edge of the corner 32 is in contact with a circle having the same radius R as the radius of curvature (inside R) of the recess 23, the distance between the center of the circle and the corner of the corner 33 is R × √2. The distance between the edge of this circle and the edge of the corner 33 is P in the direction parallel to the edge of the corner 33.

At this time, the relationship between P and R (inside R) is as follows.
P = R− {R / √2}
P = Inside R- {Inside R / √2}
Therefore, P and R are set so as to satisfy this relationship, the rectangular wire that becomes the rectangular coil 2 is crushed, and then bent, so that the recessed portion 23 can have an optimum shape.

  4C, when the width of the straight portion 21 of the rectangular coil 2 is W and the thickness is T, the width of the corner portion 22 is WP. When the radius of curvature of the outer peripheral surface of the corner portion 22 is an outer radius R, the outer radius R is substantially equal to the inner W + RP. The thickness of the corner portion 22 is the same as the thickness T of the straight portion 21 and is desirably a constant thickness from the inner peripheral side to the outer peripheral side. When a flat wire is crushed by a normal pressing process, the meat of the wire material rises and swells easily when being pushed from the inner peripheral side, so that it is preferable to perform the processing while suppressing the bulge. Similarly, also when forming the recessed part 23 by bending, the lamination thickness can be minimized by preventing the swelling and maintaining a constant thickness.

  Next, the manufacturing method of the rectangular coil 2 of this invention is demonstrated with FIGS. FIG. 5 shows a schematic process for manufacturing the rectangular coil 2 from a rectangular wire. The side edge of the rectangular wire 25 is crushed by using a crushing jig to be described later to form a recess 24 that becomes a recessed portion 23. A first molding step to be formed (first step) and a second molding step for forming the recess 23 by bending the forming portion (molding portion) of the recess 24 using a bending jig described later. (Second step). Preferably, the rectangular wire is intermittently sent out, and the processes by the first molding process and the second molding process are performed simultaneously when stopped. In this way, the rectangular coil 2 in which the rectangular flat wires are laminated in the thickness direction can be manufactured by continuously performing the molding process.

  As an example, for the flat wire 25, for example, a flat copper wire having a thickness of 0.8 mm and a width of 9.0 mm is used. At this time, from the relationship of FIG. 4 described above, in the first molding step, the recess 24 to be the recessed portion 23 is molded, for example, with a radius of curvature R = 4 mm and a depth of 2 mm. When this molded portion is bent in the second molding step, a concave portion 23 having a radius of curvature R = 4 mm is formed in the corner portion 22 of the rectangular coil 2 as shown in FIG. In the corner 22, the curvature radius R of the outer peripheral surface is obtained by subtracting the thickness (2 mm) moved from the inner side from the sum of the curvature radius R (4 mm) of the outer peripheral surface and the line width W (9 mm) of the flat wire 25. It becomes a value (11 mm), and it can be seen that the line width of the corner portion 22 is secured.

  7 and 8 are apparatus configuration examples for manufacturing the rectangular coil 2, and a bobbin 4 serving as a supply unit for the flat wire 25, and a crushing jig 5 serving as a first mold for performing a first molding step, The bending jig 6 which is a second mold for performing the second molding step is aligned in the feed direction of the flat wire 25. The crushing jig 5 has a pair of a movable mold 51 and a fixed mold 52 that are opposed to each other with the flat wire 25 interposed therebetween. By pressing the movable mold 51 in the opposing direction, a concave portion 23 is formed at the side edge of the flat wire 25. A recess 24 is formed. The bending jig 6 has a fixed die 61, a bending base 63, and a movable die 63 that are aligned in the feed direction of the flat wire 25. By rotating the movable die 62 located at the rear around the bending base 63 by 90 degrees, A corner portion 22 having a recessed portion 23 is formed on the inner peripheral side.

  As shown in FIG. 8, the flat wire 25 is preferably used as a pressing member on the crushing jig 5 composed of a pair of block-shaped molds 51, 52 and the bending jig 6 composed of a pair of block-shaped molds 61, 62. A bulge retainer 53 and a bulge retainer 64 are provided. The right side of FIG. 8 shows a state where the bulge pressers 53 and 64 are not arranged, and the upper surface of the fixed die 51 of the crushing jig 5, the fixed die 61 of the bending jig 6, and the upper surface of the movable die 62 are in the feed direction of the flat wire 25. Are arranged adjacent to each other so as to constitute the same surface. The flat wire 25 is held in the feed groove 41 formed on these upper surfaces and guided along the feed groove 41.

  The swell presser 53 of the crushing jig 5 is a rectangular flat plate placed above the fixed mold 51 and presses the flat wire 25 supported by the feed groove 41 from above. The bulge presser 64 of the bending jig 6 is a circular plate placed on the upper side of the cylindrical bending base 63 and presses the flat wire 25 supported by the feed groove 41 in contact with the bending jig 6 from above. These bulge retainers 53 and 64 only need to be able to suppress the rise of meat due to processing, and are adjusted to have a pressing force that does not hinder the feeding of the flat wire 25. The left figure of FIG. 9 is a state in which the bending tool 6 is bent, the movable die 62 is rotated around the bending base 63, and the flat wire 25 is bent 90 degrees, and the bulge pressers 53 and 64 are removed from the right figure. Indicates the state. The bending base 63 is disposed on the side edge along the feed groove 41 between the pair of dies 61 and 62.

  FIG. 10 shows a detailed shape example of the crushing jig 5 and a processing procedure. The block-shaped fixed die (die) 52 has an upper surface side edge on the movable die (punch) 51 side recessed into an L shape with a constant width to form a feed groove 41 wider than the flat wire 25. On the upper surface of the punch 51, a flange 55 is formed on the side edge adjacent to the feed groove 41 so as to project with a predetermined width in the direction of the die 52, and a pushing portion 54 protruding in a substantially semicircular shape is provided at the center. . When the flat wire 25 is set in the feed groove 41 of the die 52 in the procedure 1 in the figure, the processing position spaced from the recess 24 formed in the previous step and the pushing portion 54 of the punch 51 are opposite. In the subsequent procedure 2, the bulge presser 53 is disposed above the die 52, and the punch 51 moves toward the opposing die 52 to start pushing.

  In step 3, when the punch 51 is pushed in, the flange 55 protrudes onto the feed groove 41, and the substantially semicircular push-in part 54 bites into the side edge of the flat wire 25. By repeating this, arc-shaped depressions 24 along the shape of the push-in portion 54 are formed at predetermined equal intervals on the side edge of the flat wire 25.

  FIG. 11 shows a detailed shape example of the bending jig 6 and a processing procedure. The fixed mold (fixed block) 61 and the movable mold (movable block) 62 are formed into a feed groove 41 corresponding to the width of the flat wire 25 by recessing the upper surface of the bending base into a U-shape with a constant width. The feed groove 41 is on the extension of the feed groove 41 of the crushing jig 5, and the side edge on the bending base 63 side is closed. The upper surface of the bending base 63 is in the same plane as the feed groove 41, and an inner R shape determining pin 65, which is a cylindrical pin member, protrudes upward from the center portion thereof. The inner R shape determining pin 65 has a shape corresponding to the inner R of the recessed portion 23 of the rectangular coil 2.

  When the flat wire 25 is set in the feed groove 41 of the bending jig 6 in the procedure 1 in the figure, the predetermined processing position where the recess 24 is formed by crushing is the inner R shape determining pin of the bending base 63. 65 is arranged on the side. In the following procedure 2, an annular bulge retainer 64 is mounted from above the inner R shape determining pin 65, and in step 3, the movable block 62 is rotated around the bending base 63. Then, it is processed into a predetermined bent shape in a state where the recess 24 of the flat wire 25 is fitted to the arc-shaped side surface of the inner R-shape determining pin 65 serving as a bending fulcrum. At this time, the flat wire 25 is easily bent by the arc-shaped depression 24 of the flat wire 25 and the inner R shape determining pin 65 serving as a bending fulcrum, thereby forming an arc-shaped corner portion 22 having a small outer R.

  FIG. 12 shows a rectangular coil 2 (left figure) manufactured by using the method of the present invention in comparison with a rectangular coil 10 (right figure) manufactured by a conventional method. The conventional rectangular coil 10 is laminated by bending rectangular wires in the same direction at regular intervals, and the corner portions have overlapping due to folding, so each layer has a thickness (t) of 2 of the rectangular wire. The stacking height is t × 2N with respect to the number of turns (N). The length of the straight portion serving as the cooling surface with respect to the outer shape (width X) of the rectangular coil 10 is X−W × 2 when the width of the rectangular wire (W) is set, and a core of this size can be accommodated. The case of the method of Patent Document 1 in which the folding direction of each layer is partially changed is the same as that of the rectangular coil 10.

  On the other hand, the rectangular coil 2 of the present invention can accept a corner 33 of the magnetic core 3 due to the R shape of the corner portion 22, and therefore can accommodate a core having the same size as the conventional rectangular coil 10. When the pushing amount by the inner R shape is P, the length of the straight portion 21 serving as the cooling surface is X-2 (W + inner RP). This is, for example, a decrease of less than 10% when X = 60 mm. Since the difference is smaller when the physique is large, a large difference does not occur with respect to the conventional rectangular coil 10. Further, bending with a small outer radius can be easily performed.

  In addition, when compared with the cooling surface of the same area, the rectangular coil 2 of the present invention is ½ the height at the same number of turns compared to the conventional rectangular coil 10, so that the effective cooling surface is There is an advantage of being doubled. Note that it is known that the corner portion 22 has a portion where the cross-sectional area is reduced by bending (for example, about 83%), and even if the cross-sectional area of the entire coil is similarly reduced in consideration of this, When the effective cooling surface of the rectangular coil 10 is 100%, the effective cooling surface is (83-10) × 2 = 146 (%). That is, an improvement of 46% of the effective cooling surface can be expected.

  As described above, according to the present invention, the core corner portion can be allowed by the recessed portion 23 formed on the inner periphery of the rectangular coil 2, which is effective in increasing the volume of the core that can be accommodated. In addition, by providing a recess 24 to be the recess 23 in advance, the edgewise winding by bending the flat wire 25 is facilitated, and the stacking height can be reduced, so that the product can be downsized and improved in performance. is there. Furthermore, since it can be bent continuously on one axis to obtain a product shape, the apparatus configuration can be simplified, and processing using a wire with an insulation coating can be performed. This is unnecessary and contributes to cost reduction.

  In the said embodiment, although the example of the reactor coil 1 to which this invention was applied was demonstrated, if it is a coil apparatus which has the square-shaped coil 2 and the columnar core 31 accommodated in the cylinder, it can be used suitably for all. . In addition, the shape of the recessed portion 23 formed in the rectangular coil 2, the shape of the recess 24 formed in the rectangular wire 25, the overall shape of the magnetic core 3, and other configurations can be changed as appropriate. Also about the apparatus for manufacturing the rectangular coil 2, unless the basic structure is changed, the shape and the like of the crushing jig 5 and the bending jig 6 can be appropriately changed.

  As described above, the coil device of the present invention is suitably used for various applications such as in-vehicle or home appliance electronic devices, control devices, power supply devices, and drive devices that are low cost, small and high performance, and have a small storage space. can do.

1 Reactor coil (coil device)
2 square coil 21 straight portion 22 corner portion 23 recessed portion 24 dent 25 flat wire 3 magnetic core 31 columnar core 4 bobbin 41 feed groove 5 crushing jigs 51, 52 a pair of molds 53 bulge presser (pressing member)
54 Pushing part 6 Bending jigs 61 and 62 A pair of molds 63 Bending base 64 Swelling presser (pressing member)
65 Inner R shape determination pin (pin member)

Claims (7)

A coil device (1) having a columnar core (31) having a square cross section and a square coil (2) mounted around the columnar core,
The rectangular coil is formed by edgewise winding a rectangular wire (25) in a rectangular shape along the outer peripheral surface of the columnar core, thereby adjacent to a plurality of straight portions (21) parallel to each side of the columnar core. A plurality of corner portions (22) that connect the matching straight portions, and a part of the inner peripheral surface of the flat wire forming each corner portion is recessed toward the outer peripheral surface side, and the columnar core A coil device provided with a recess (23) capable of accommodating each corner (33).   2. The recess according to claim 1, wherein the recess is formed by crushing a side edge of the rectangular wire in advance to form a recess (24), and bending the recess so as to be on the inner peripheral surface side. Coil device.   3. The flat wire is an insulation-coated wire, and the recessed portion is formed in an arc shape surrounding the corner portion of the columnar core by bending the recess forming portion having an arc shape. The coil apparatus as described. It is a manufacturing method of the coil apparatus according to claim 1,
A first step of forming a recess by crushing one side edge of a flat wire of constant thickness using a crushing jig (5);
A second step of forming the recess by bending using a bending jig (6) so that the formation part of the depression is on the inner peripheral side,
A method of manufacturing a coil device, wherein edgewise winding is performed in a predetermined rectangular shape by repeating the first step and the second step in order while feeding the rectangular wire. In the manufacturing method of the coil device according to claim 4,
The crushing jig has a pair of movable molds (51) and a fixed mold (52) that are horizontally opposed to each other, and has a feed groove (41) that supports the rectangular wire on the upper surface of the fixed mold. The manufacturing method of the coil apparatus which pushes the pushing part (54) provided in the said movable mold | die into the side edge part of the said flat wire, and crushes the said hollow. In the manufacturing method of the coil apparatus according to claim 4 or 5,
The bending jig has a pair of block-shaped movable molds (62) and a fixed mold (61) aligned in the horizontal direction, and a feed groove (41) for supporting the rectangular wire on the upper surfaces of the movable mold and the fixed mold. And a method of manufacturing a coil device in which the recessed portion is formed by bending the recessed portion using the pin member (65) disposed on the side of the feed groove as a bending fulcrum. In the manufacturing method of the coil apparatus of any one of Claim 4 thru | or 6,
The said crushing jig or the said bending jig is a manufacturing method of a coil apparatus provided with the holding member (53, 64) which suppresses the swelling of the said flat wire at the time of a crushing process or a bending process.

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