JP6552067B2 - Coil manufacturing method and coil manufacturing apparatus - Google Patents

Description

  The present invention relates to a coil manufacturing method and a coil apparatus for joining by pressing and deforming flat plates.

  Examples of a coil device in which a coil is disposed around a core (stator core) of a stator core (stator core) include electric devices such as a motor, a generator, a transformer, etc. In such a coil device, low loss In order to achieve miniaturization and miniaturization, it is important to improve the space factor of the coils in the core.

  Conventionally, a coil using a rectangular conductor (hereinafter referred to as a rectangular coil) is known as a coil capable of improving the space factor in the core. The flat coil is also referred to as a flat wound (square wound) coil, a square (square) coil, an edgewise coil, etc., with respect to a coil wound with a round wire whose cross-sectional shape orthogonal to the longitudinal direction is substantially circular. Coil means a coil formed by winding a flat rectangular conductor whose cross-sectional shape orthogonal to the longitudinal direction is rectangular.

  Further, as a method of manufacturing a flat coil, there is known a method of winding a long flat rectangular conductive wire (square conductive wire) into a substantially rectangular shape (see, for example, Patent Document 1). Also known is a method in which a rectangular conductor (flat conductive material) with a length of one turn of a coil is laminated, and the lower end upper surface and the upper lower end surface are overlapped and repeated by a joining means to form a spiral structure. (See, for example, Patent Document 2).

  As a conductor connection method, a cold pressure welding method is known (see, for example, Patent Document 3).

Japanese Patent No. 3881520 JP 2005-130676 A

  However, in the method of winding a long flat rectangular conductor wire into a substantially rectangular shape as in the technique described in Patent Document 1, the corners (both on the outer peripheral side and the inner peripheral side) are curved and rounded. It is inevitable. Since the core is generally in the form of a prism having substantially square corners, when a rounded coil is disposed around the core, a space is created between the core and the coil. Since this space accumulates heat during operation of the coil device, the heat dissipation of the coil device is deteriorated, and there is a problem that the efficiency of the coil device can not be increased due to the increase of the coil resistance. In addition, there is a limit to the improvement of the space factor of the coil at the corner.

  In addition, since the outer periphery of the rectangular conductor wire used for the coil is coated with an insulating resin in advance, the winding of the rectangular conductor becomes thin due to the bending at the corners on the outer periphery side, which reduces the withstand voltage of the coil device. there were.

  On the other hand, in the case of a method of laminating and joining flat rectangular conductors for one turn of a coil as in the technique described in Patent Document 2, it is possible not to bend corner portions, and the heat dissipation and space factor described above This problem can be avoided. However, although it is connected by the joining means, it is inevitable that the characteristics of the joined portion between the lower end surface of the upper stage and the lower end surface of the upper stage are deteriorated compared to the uncut portion, which stabilizes the operation. Problems remain in terms.

  Furthermore, although one method of connecting the conductors is known, the method of cold-welding the round conductors is known. However, the flat-wires are cold-welded with good improvement of the stability of the connection. It was difficult.

  The present invention makes it possible to improve the space factor and improve the heat dissipation properties, and manufacture a coil that does not cause characteristic deterioration due to cutting and joining, and good stability of the connection even for flat angle conductors. It is an object of the present invention to provide a coil manufacturing method and a coil manufacturing device that can be improved.

  The present invention solves the above-mentioned subject by the following means.

The present invention is a method of manufacturing a coil for forming a helical structure with pressed multiple Hirashirube body strip, said plurality of flat conductors, the band longitudinal direction end surfaces with each other so as to be aligned in a spiral direction of travel When arranged in contact, it is possible to construct a spiral structure in a virtual state (hereinafter referred to as "virtual spiral structure"), and the length of one turn of the virtual spiral structure is 1 of the spiral structure. It is set so as to be longer than the circumferential length by the pressing amount of the pressure contact, and the region for one circumference of the virtual spiral structure is a first linear portion extending in the first direction and a second direction And a corner connecting the first straight portion and the second straight portion, and the one flat conductor and the other flat conductor may in a region serving as the straight line portion except, against each of the end faces to press along the band longitudinal direction, distance While condensation to form a pressure contact to connect flat conductors, the one revolution length of the connecting flat conductor comprising the step of matching the length of one circumference of the helical structure, the coil, characterized in that It is a manufacturing method.

The present invention also provides a coil manufacturing apparatus that seaming a plurality of flat conductors of the strip to form a helical structure, said plurality of flat conductors, the band longitudinal direction end surfaces with each other so as to be aligned in a spiral direction of travel equivalents When arranged side by side, it is possible to construct a spiral structure in a virtual state (hereinafter referred to as "virtual spiral structure"), and the length of one round of the virtual spiral structure is one round of the spiral structure. The length of the pressing portion is set to be longer than the length of a minute, and the area of one turn of the virtual spiral structure extends in the first direction and the second direction extending in the first direction. It has a second straight portion existing, a corner portion connecting the first straight portion and the second straight portion, and can hold one flat conductor and another flat conductor. A first holding part and a second holding part arranged opposite to each other,
A driving unit for moving the first holding unit and the second holding unit, and the first holding unit and the second holding unit are areas that become the straight portions excluding the corner portions In which the end faces of the one flat conductor and the other flat conductor are butted against each other and pressed along the longitudinal direction of the strip, and pressure contact is performed while shortening the distance, thereby a length of one circumference of the spiral structure A coil manufacturing apparatus is characterized in that a connecting flat conductor having a length corresponding to one circumference is formed .

  According to the present invention, it is possible to improve the space factor and to improve the heat dissipation, and manufacture a coil that does not cause characteristic deterioration due to cutting and joining, and stable connection even if rectangular conductors are mutually connected. It is possible to provide a coil manufacturing method and a coil manufacturing apparatus capable of improving the properties.

(A) It is the external view (front view) which showed typically the structure of the cold pressure welding apparatus which concerns on this embodiment partially. (B) It is a top view of a flat conductor. (C) It is the sectional view on the AA line of FIG.1 (b). It is the external view (front view) which showed typically the holding | maintenance part of the cold pressure welding apparatus which concerns on this embodiment. It is the external view (front view) which showed typically the holding | maintenance part of the cold pressure welding apparatus which concerns on this embodiment. It is the side view which showed typically the holding | maintenance part of the cold welding apparatus which concerns on this embodiment. It is a top view which shows the flat angle conductor which concerns on this embodiment. It is a schematic diagram which shows the mode of the cold pressure welding of the flat conductor which concerns on this embodiment. It is a figure which shows the coil manufacturing apparatus which concerns on this embodiment, It is a side view of (a) holding | maintenance part, (b) It is a front view of a coil, It is a front view of (c) holding | maintenance part. It is a side view of a attaching part of a coil manufacturing device concerning this embodiment. It is a schematic diagram explaining the coil manufacturing method concerning this embodiment. It is a schematic diagram explaining the coil manufacturing method concerning this embodiment. It is a modification of the coil piece which concerns on this embodiment. It is a figure explaining the modification of the coil manufacturing device concerning this embodiment, and a coil manufacturing method. It is a figure explaining the coil which concerns on this embodiment, (a) It is a front view, (b) It is sectional drawing, (c) It is a side view. It is a figure which shows the experimental result about the emitted-heat amount of the coil which concerns on this embodiment, and the coil of a prior art example. It is a figure explaining the attachment method to the status core of the coil which concerns on this embodiment, (a) It is a side view, (b) It is a top view of the figure (a), (c) The figure (a) FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  <Cold welding equipment>

  FIG. 1 is a view for explaining a cold pressure welding apparatus 10 according to the present embodiment, and FIG. 1 (a) is an external view (front view) partially schematically showing the structure of the cold pressure welding apparatus 10. FIG. 1B is a top view of the flat conductor C, and FIG. 1C is a cross-sectional view taken along line AA in FIG.

  As shown in FIG. 6A, the cold welding apparatus 10 is an apparatus for cold welding two flat conductors C (C1 and C2), and includes a first holding unit 11 and a second holding unit 12; The drive unit 13 and the control unit 14 are provided. In addition, in the following description, as shown to the figure (b) (c), the flat conductor C means the strip | belt-shaped (tape-like) conductor comprised by the plane with respect to the round wire conductor. That is, the flat conductor is a strip-shaped member having two opposing wide surfaces WS and two opposing narrow surfaces WT, as shown in FIGS. The cross section orthogonal to the band longitudinal direction BL (the line A-A in the same figure (b)) means a rectangular or rounded rectangular conductor as shown in the figure (c). In the following description, as an example of the flat conductor, a flat rectangular conductor having a rectangular cross section orthogonal to the longitudinal direction of the strip will be described as an example.

  The first holding portion 11 is movable along the first direction (the longitudinal direction of the flat rectangular conductor; the X direction in FIG. 6A), and the first upper holding member 111 and the first lower holding member 112 Composed. The first upper holding body 111 and the first lower holding body 112 are disposed to face each other so as to have an opposing surface OS1 along the first direction (hereinafter, referred to as the X direction). In the present embodiment, for convenience of explanation, the upper holding body shown in the drawing is referred to as a first upper holding body 111, and the lower holding body shown in the drawing is referred to as a second lower holding body 122. It is not limited to above and below. That is, FIG. 1A may be a top view of the cold pressure welding apparatus 10. In that case, the first upper holding body 111 is, for example, a holding body on the back side, and the first lower holding body 112 is, for example, the near side. It becomes the side holder. The first upper support 111 may be, for example, a left support, and the first lower support 112 may be, for example, a right support.

  The first upper holding body 111 and the first lower holding body 112 are movable along the X direction, and the facing surface OS1 along the X direction is in the second direction (the thickness direction of the flat conductor; the same It can move along the Y direction in FIG. The Y direction is a direction different from the X direction, for example, a direction orthogonal to the X direction.

  The second holding unit 12 is disposed to face the first holding unit 11 so as to have an opposing surface OS2 along the second direction (hereinafter referred to as the Y direction) with the first holding unit 11. The configuration is the same as that of the first holding unit 11. Accordingly, although the detailed description is omitted, the second holding unit 12 is movable along the X direction, and is configured of the second upper holding body 121 and the second lower holding body 122. The descriptions of “upper and lower” of the second upper holding body 121 and the second lower holding body 122 are also similar to those of the first holding portion 11.

  The second upper holding body 121 and the second lower holding body 122 are movable along the X direction, and are movable so that the facing surfaces OS1 abut or are separated from each other along the Y direction.

  Further, the first holding portion 11 and the second holding portion 12 are biased by a biasing member (for example, a coil spring) 15 in a direction in which they are separated from each other along the X direction. Although not shown, the first upper holding member 111 and the first lower holding member 112 are biased by a biasing member (for example, a coil spring) in a direction away from each other along the Y direction. The upper holding body 121 and the second lower holding body 122 are biased by a biasing member (for example, a coil spring) in a direction away from each other along the Y direction.

  The drive unit 13 moves the first holding unit 11 and the second holding unit 12 along the X direction and the Y direction via a drive transmission unit (not shown) according to an instruction from the control unit 14.

  On the outside of the first holding portion 11 and the second holding portion 12 in the X direction, a movement restricting portion 17 is provided which suppresses the movement of the first flat conductor C1 and the second flat conductor C2 mainly in the Y direction. . The movement restricting portion 17 abuts on both surfaces of the first flat conductor C1 (second flat conductor C2) and restricts movement in the Y direction. Also, movement of one side (direction in which the first flat conductor C1 and the second flat conductor C2 approach) along the X direction is permitted, and the other along the X direction (first flat conductor C1 and second flat conductor C2 separate) Direction). More specifically, the movement restricting portion 17 is a roller body urged toward the center of the first holding portion 11 and the second holding portion 12 by an urging member (coil spring, plate spring, etc.) 171. . The movement restricting portion 17 is formed with uneven shapes (not shown, for example, a saw blade-shaped uneven shape) along the circumferential direction on both end sides in the rotation center axis direction, and holds a flat conductor at the roller body portion. ing. For example, when describing the movement restricting parts 17A and 17B of the first holding part 11, when the first flat conductor C1 moves in the left direction in the figure along the X direction, the movement restricting part 17A rotates clockwise. The movement restricting portion 17B rotates counterclockwise to enable movement of the first rectangular conductor C1. On the other hand, when the first flat conductor C1 moves in the X direction along the X direction, the movement restricting portion 17A rotates counterclockwise, and the movement restricting portion 17B tries to rotate clockwise. The concavo-convex shapes provided along the circumferential direction of both ends of the central axis engage with each other, and the movement of the first flat conductor C1 to the right is restricted in order to prevent rotation. The same applies to the second holding unit 12.

  Further, a pressing portion 18 is provided on the outer side in the Y direction of the first holding portion 11 and the second holding portion 12. The pressing portion 18 presses the first upper holding body 111 and the first lower holding body 112 so as to abut each other, and the second upper holding body 121 and the second lower holding body 122 abut each other. Press these.

  FIGS. 2 and 3 are front views in which the first holding unit 11 and the second holding unit 12 are extracted, and are diagrams illustrating the state of movement of these.

  2 mainly shows Y of the first holding portion 11 (the first upper holding body 111 and the first lower holding body 112) and the second holding portion 12 (the second upper holding body 121 and the second lower holding body 122). It is a figure explaining movement along a direction.

  In the state shown in FIG. 6A, the facing surfaces OS1 of the first upper holding body 111 and the first lower holding body 112 (the same applies to the second upper holding body 121 and the second lower holding body 122) are the most in the Y direction. It is a position to be separated. Hereinafter, this position is referred to as a Y-direction separation position. Further, in this state, this position, which is a position at which the facing surfaces OS2 of the first holding portion 11 and the second holding portion 12 are most separated in the X direction, is hereinafter referred to as an X-direction separated position.

  The figure (b) of the figure is a state which moved to the position which opposing surface OS1 of the 1st upper holding body 111 and the 1st lower holding body 112 abuts from the state shown to the figure (a). In this state, the first holding portion 11 sandwiches the (wide surface WS) of the first rectangular conductor with the first upper holding body 111 and the first lower holding body 112, and the second holding portion 12 holds the second upper holding body 121. And the second lower holding body 122 sandwich (the wide surface WS of) the second flat conductor.

  The first holding portion 11 holds the first rectangular conductor C1 so as to protrude in the direction of the second holding portion 12 from the facing surface OS2 along the Y direction. Similarly, the second holding portion 12 holds the second flat rectangular conductor C2 so as to protrude in the direction of the first holding portion 11 from the facing surface OS2 along the Y direction. The protrusion amount A1 of the first flat conductor C1 from the first holding portion 11 and the protrusion amount A2 of the second flat conductor C2 from the second holding portion 12 will be described later.

  The position at which the facing surface OS1 of the first upper holding body 111 and the first lower holding body 112 (the second upper holding body 121 and the second lower holding body 122) abut on each other is referred to as a holding position in the following description. That is, the first upper holding body 111 and the first lower holding body 112 (the second upper holding body 121 and the second lower holding body 122) are movable between the holding position and the Y-direction spaced position.

  Further, as shown in FIG. 6C, the release position (in the Y direction) of the hold is included between the hold position and the Y-direction separation position. The release position in the Y direction (hereinafter referred to as the Y direction release position) is a distance smaller than the Y direction separation position, and the first upper support 111 and the first lower support 112 (the second upper support 121 and the second lower support). The body 122) is at a position spaced apart.

  In addition, the position where opposing surface OS1 of the 1st upper holding body 111 and the 1st lower holding body 112 (the 2nd upper holding body 121 and the 2nd lower holding body 122) contacts from the Y direction cancellation position of the figure (c). It is also possible to move to the state shown in FIG.

  In FIG. 2, the positions of the first holding unit 11 and the second holding unit 12 along the X direction are maintained at the X direction separation position.

FIG. 3 is a diagram illustrating the movement of the first holding unit 11 and the second holding unit 12 mainly along the X direction.
FIG. 3A is a position at which the first holding unit 11 and the second holding unit 12 are moved along the X direction so that the facing surface OS2 is closest to the state in FIG. 2B. Hereinafter, this position is called a proximity position. That is, the first holding unit 11 and the second holding unit 12 are movable between the X-direction separated position shown in FIG. 2 and the close position shown in FIG. 3 (a). Even if it is a proximity position, the 1st holding | maintenance part 11 and the 2nd holding | maintenance part 12 do not contact | abut.

  The first holding portion 11 holds the first flat conductor C1 with the protruding amount A, and the second holding portion 12 holds the second flat conductor C2 with the protruding amount A2 ( 2B, when the first holding portion 11 and the second holding portion 12 are in the close position, the first holding portion 11 and the second holding portion 12 do not abut, but the first flat conductor C1 and the second flat portion The flat conductor C2 comes into contact (joining) and is pressed in a different manner. That is, the protrusion amount A1 of the first flat conductor C1 from the first holding portion 11 and the protrusion amount A2 of the second flat conductor C2 from the second holding portion 12 are respectively the first holding portion 11 and the second holding portion 12 When the two are close to each other, the amount is slightly longer than the length of contact with each other (the amount that can be pressed together after contact).

  Further, as shown in FIG. 2B, the release position (in the X direction) of the pressing is included between the proximity position and the X direction separation position (FIG. 2A). The release position in the X direction (hereinafter, the X direction release position) is a position at which the first holding portion 11 and the second holding portion 12 are separated at a distance smaller than the X direction separation position. When the first holding unit 11 and the second holding unit 12 are in the X direction release position, the first upper holding body 111 and the first lower holding body 112 are also separated and moved to the Y direction release position, and the second upper holding body 121 and the first lower holding body 112 are also separated and moved to the Y direction release position.

  In addition, it can also transition to the state shown to the figure (a) from the X direction cancellation | release position of the figure (b).

  FIG. 4 is a side view (viewed in the direction of arrow V in FIG. 1) of the first holding portion 11 when the facing surface OS2 of the first holding portion 11 is viewed from the second holding portion 12 side. The figure (a) has shown the state (state of FIG. 2 (a)) in which the 1st upper holding body 111 and the 1st lower holding body 112 are in a Y direction separated position, and the figure (b) is a holding position. State of FIG. 2 (b)).

  The first upper holding body 111 has a rectangular conductor holding groove 111A at a position close to one end face (right end face in the drawing) 111S in the third direction (the rectangular short band direction of the rectangular conductor; the Z direction in the figure). The first lower holding body 112 is provided with a rectangular conductor holding groove 112A at a position close to one end face (right end face in the drawing) 112S in the third direction (hereinafter referred to as Z direction). The third direction (Z direction) is a direction different from each of the X direction and the Y direction, and in this case, is a direction orthogonal to both.

  One end face 111S of the first upper holding body 111 and one end face 112S of the first lower holding body 112 are positioned on the same plane, and one end face in the third direction (Z direction) 1 refers to the front of the first upper holding body 111 and the first lower holding body 112, and refers to the end face near the worker.

  The rectangular conductor holding grooves 111A and 112A are located on the inner side of the first upper holding body 111 and the end surfaces 111S and 112S of the first lower holding body 112 at a distance d1 in the third direction (Z direction), and the first upper holding body. It is a rectangular groove provided on the facing surface OS1 of the body 111 and the first lower holding body 112.

  Further, as will be described in detail later, the rectangular conductor holding grooves 111A and 112A need to reliably hold (clamp) the rectangular conductor. Therefore, the shape is along the outer shape of the flat conductor, and the depth d2 of the groove is less than half the thickness d3 of the sandwiched flat conductor (here, the first flat conductor C1). . Specifically, the depths of the rectangular conductor holding grooves 111A and 112A are smaller by about 5/100 mm than half of the thickness d2 of the rectangular conductor.

  As shown to the figure (b), when opposing surface OS1 of the 1st upper holding body 111 and the 1st lower holding body 112 contact | abuts (when it exists in the clamping position (FIG. 2 (b)), a flat angle conductor The holding grooves 111A and 112A become one square columnar hole that penetrates the first holding part 11 in the X direction, and a flat conductor (first flat conductor C1) is compressed in the plate thickness d2 direction into the hole. It is in close contact with the rectangular conductor holding grooves 111A and 112A in a state (in a state where the plate thickness is reduced), and is held by the first holding portion 11 (the first upper holding body 111 and the first lower holding body 112).

  Furthermore, in order to ensure the holding (holding) of the flat conductor, the flat conductor holding grooves 111A and 112A have a non-slip processing surface NS. The anti-slip processed surface NS is, for example, a high frictional resistance surface or a high adsorptive surface. Specifically, for example, a surface that increases the frictional resistance by fine concavo-convex processing by sandblasting or the like, or a so-called saw blade formed so that the frictional resistance in one direction is higher than the frictional resistance in the other direction. It may be a machined surface on which concave and convex portions are formed. Further, the surface may be a surface in which the adsorptive power is enhanced by bringing it into a vacuum state, or it may be a surface in which the adsorptive power is enhanced by the pressure or atomic force of vacuum by mirror surface processing. In addition, when the degree of concavo-convex processing is large, a non-uniform electric field may occur (corona discharge), and in the case of manufacturing a coil or the like, the coating may be broken or the like. Therefore, it is desirable that the fine concavo-convex processing which can be formed by sand blasting. The anti-slip processed surface is formed to a thickness (depth) of 10% of the plate thickness.

  In addition, although illustration is omitted here, the same applies to the second holding portion 12 and one end face (front face closer to the operator) in the third direction (Z direction) of the second upper holding body 121. A flat conductor holding groove 121A is provided at a position close to the second upper holding body 121, and a flat conductor holding groove 122A is provided at a position close to one end face in the third direction in the second upper holding body 121. The configuration of the flat conductor holding grooves 121A and 122A is the same as that of the flat conductor holding grooves 111A and 112A of the first holding unit 11.

  The drive unit 13 moves the first holding unit 11 and the second holding unit 12 between the X-direction separation position and the proximity position along the X direction via a drive transmission unit (not shown) according to an instruction from the control unit 14. Move. The drive transmission unit can be configured with an appropriate configuration such as a linear guide, a cam mechanism, or a rack and pinion, for example. Further, the driving unit 13 holds the first upper holding body 111 and the first lower holding body 112 in the Y direction along the Y direction via a drive transmission unit (not shown) according to an instruction from the control unit 14. While moving between the separated positions, the second upper holding body 121 and the second lower holding body 122 are moved between the holding position and the Y-direction separated position.

  Thus, the drive unit 13 holds the first holding unit 11 and the second holding unit 12 in any of the holding state, the pressure contact state and the pressure cancellation state, the withdrawal state, and the transition state between these two states. It can be controlled to be in the state of

  Referring again to FIGS. 2 and 3, in the sandwiching state, the first upper holding body 111 and the first lower holding body 112 of the first holding portion 11 are separated from each other in the Y direction along the Y direction (FIG. (a)) to move to the holding position (FIG. 2 (b)) to hold the first flat conductor C1 between the first upper holding body 111 and the first lower holding body 112, and the second holding portion 12 The upper holding body 121 and the second lower holding body 122 are moved from the Y-direction spaced position (FIG. 2 (a)) to the holding position (FIG. 2 (b)) along the Y direction. The second flat rectangular conductor C <b> 2 is held by the second lower holding body 122.

  As described above, the first holding portion 11 holds the first rectangular conductor C1 so as to protrude from the facing surface OS2 along the Y direction by the protrusion amount A1 in the direction of the second holding portion 12, and the second holding portion 12 The second flat conductor C2 is protruded from the facing surface OS2 along the Y direction in the direction of the first holding portion 11 by the protruding amount A2, and is sandwiched.

  At this time, the pressing portion 18 (see FIG. 1A) presses them so that the first upper holding body 111 and the first lower holding body 112 abut, and the second upper holding body 121 and the second lower holding These are pressed so that the body 122 abuts. Accordingly, the first rectangular conductor C1 and the second rectangular conductor C2 are in close contact with the rectangular conductor holding grooves 111A and 112A in a state where the first rectangular conductor C1 and the second rectangular conductor C2 are compressed in the plate thickness direction (a state where the plate thickness is thinned), It is clamped by the 2nd holding | maintenance part 12 (refer FIG. 4).

  Further, in the holding state, the first upper holding body 111 and the first lower holding body 112 of the first holding portion 11 in the Y direction release position (FIG. 2C) are at the holding position (FIG. 2B). As it moves and causes the first upper holding body 111 and the first lower holding body 112 to sandwich the first flat conductor C1, the second upper side of the second holding portion 12 in the Y direction release position (FIG. 2C). In the case where the holding member 121 and the second lower holding member 122 are moved to the holding position (FIG. 2B), and the second flat rectangular conductor C2 is held between the second upper holding member 121 and the second lower holding member 122 There is also.

  Also at this time, the pressing unit 18 presses the first upper holding body 111 and the first lower holding body 112 so that the first upper holding body 111 and the first lower holding body 112 abut each other, and the second upper holding body 121 and the second lower holding body 122 abut. Press these. As a result, the first rectangular conductor C1 and the second rectangular conductor C2 are in close contact with the rectangular conductor holding grooves 111A and 112A in a state where the first rectangular conductor C1 and the second rectangular conductor C2 are compressed in the plate thickness direction (the plate thickness is reduced). The first holding portion 11 and the second holding portion 12 hold the same (FIG. 4).

  In the pressure contact state, the first holding portion 11 and the second holding portion 12 in the holding state are resisted by the urging force of the urging member 15, and are separated from the X direction away from the X direction (FIG. 2A) It moves to the proximity position (FIG. 3 (a)). At this time, the first flat conductor C <b> 1 protrudes from the first holding part 11, and the second flat conductor C <b> 2 protrudes from the second holding part 12. When the first holding portion 11 and the second holding portion 12 are in the proximity position (FIG. 3A, respectively), these protruding amounts A1 and A2 are slightly smaller than the lengths by which the opposing end surfaces in the band longitudinal direction abut each other. That is, before moving to the proximity position (immediately before), the opposing end faces of the first flat conductor C1 and the second flat conductor C2 first contact (abut) first. By moving the first holding portion 11 and the second holding portion 12 to the close position (FIG. 3A) by 13, the end faces of the first flat conductor C1 and the second flat conductor C2 which are in contact with each other butt against each other. More specifically, by pressing the end faces of the first flat conductor C1 and the second flat conductor C2 together, the stable oxide film formed on the end faces is removed, and Plastically deform them to The active planes are brought closer to 10 angstroms or less to cause mutual bonding of atoms between the metals to perform cold welding, that is, by cold welding, the first rectangular conductor C1 and the second rectangular The length of the conductor C2 in the longitudinal direction of the band is compressed (shortened) after the pressure welding as compared with that before the pressure welding, and the amount of shortening is the same in the first rectangular conductor C1 and the second rectangular conductor C2. When the length before press contact with the first flat conductor C1 is L01 and the length before press contact of the second flat conductor C2 is L02, the first flat conductor C1 has a length L01 'due to press contact, and the second flat angle. The length of the conductor C2 is shortened to L02 ', and the shortening amount S is equal (S = L01-L01' = L02-L02 ').

  In addition, since the first holding portion 11 and the second holding portion 12 do not approach any further after moving to the close position, the end faces of the first flat conductor C1 and the second flat conductor C2 are greater than each other. The pressing stops.

  In the pressure contact state, the first upper holding body 111 and the first lower holding body 112 are in the Y direction release position (FIG. 2C), or in the Y direction release position and the X direction release position (FIG. 3B). The second upper holding body 121 and the second lower holding body 122 are moved to the holding position (FIG. 2B), and the first holding portion 11 and the second holding portion 12 are resisted by the urging force of the urging member 15. Then, the end face of the first rectangular conductor C1 and the end face of the second rectangular conductor C2 are butt-pressed to perform cold welding (FIG. 3A).

  In the pressure-released state, the first holding unit 11 and the second holding unit 12 in the pressure-contacting state are controlled to move in the direction of separating along the X direction, respectively, and the first holding unit 11 and the second holding unit 12 are Move to the X direction release position. Further, the first upper holding body 111 and the first lower holding body 112 are controlled to move in the separating direction along the Y direction, and the first upper holding body 111 and the first lower holding body 112 are moved in the first Y direction. Move to the release position. Further, the second upper holding body 121 and the second lower holding body 122 are controlled to move in the separating direction along the Y direction, and the second upper holding body 121 and the second lower holding body 122 are moved in the second Y direction. Move to the release position (FIG. 3 (b)).

  In the pressure contact state, the first holding part 11 and the second holding part 12 finally reach the close position, and further pressing of the first flat conductor C1 and the second flat conductor C2 stops, so that the pressing is repeated. After the pressure-contacted state, transition to the sandwiching state is made via the pressure-released state, and the first rectangular conductor C1 and the second rectangular conductor C2 are pinched again by the first holding portion 11 and the second holding portion 12.

  Here, when the pressure contact state changes to the pressure contact release state (when the pressure contact is released), the first upper holding body 111 and the first lower holding body 112 (the second upper holding body 121 and the second The same applies to the lower support 122 as it moves away from it. However, as shown in FIG. 4, there is almost no clearance between the flat conductor holding grooves 111A, 112A, 121A, 122A and the first flat conductor C1 and the second flat conductor C2, and the plasticity of the metal due to the pressing. Part of the metal that has flowed due to the deformation (expanded joint surface) enters a slight clearance (for example, a corner portion of the groove) of the flat conductor holding grooves 111A, 112A, 121A, 122A to increase the adhesion, and the biasing member 15 The first upper holding body 111 and the first lower holding body 112 (as well as the second upper holding body 121 and the second lower holding body 122) may not be able to be separated only by the biasing force of

  Therefore, in the present embodiment, in the pressure-released state (FIG. 3B), in addition to the biasing force of the biasing member 15, the first holding portion (the first upper holding body 111 and the first lower holding body 112) The second holding portion (the second upper holding member 121 and the second lower holding portion) is moved along the X direction in a direction away from the second holding portion 12 via the drive transmission portion to return to the first X direction release position. The body 122) is moved along the X direction away from the first holding part 11 via the drive transmission part and returned to the second X direction cancellation position.

  In addition, even in the case of forcibly moving the first holding portion 11 and the second holding portion 12 apart from the biasing member 15, the movement restricting portion 17 causes the first rectangular conductor C1 and the second flat conductor C1 to be moved. The flat conductor C <b> 2 is restricted from moving in the direction away from each other along the X direction.

  In the retracted state, the first holding portion 11 and the second holding portion 12 in the pressure contact state, the pressure release state or the holding state are controlled to move to the X direction separated position along the X direction, and the first upper The holding body 111 and the first lower holding body 112 are moved along the Y direction to move to the Y direction separated position, and the second upper holding body 121 and the second lower holding body 122 are moved along the Y direction. It moves to the Y direction separation position (Fig. 2 (a)).

  The cold pressure welding apparatus 10 can perform cold pressure welding with one press of rectangular conductors, but in order to stabilize the joint surface, it is desirable to repeat pressing a plurality of times for one joint portion. As an example, the amount of compression (compression amount) of the cold pressure welding apparatus 10 is about 0.5 mm for both the first flat conductor C1 and the second flat conductor C2. Then, when one pressing portion is repeatedly pressed (cold welding) three to four times and compressed by about 1 mm or more (preferably 1.5 mm or more, specifically about 2 mm), stable bonding is obtained. A surface is obtained.

  For this reason, the cold pressure welding apparatus 10 of the present embodiment repeats the holding state, the pressure welding state and the pressure welding release state, and cold welds the first flat conductor C1 and the second flat conductor C2.

  As shown in FIG. 3A, when the first holding part 11 and the second holding part 12 are moved to the close position after the clamping state, the end faces of the first rectangular conductor C1 and the second rectangular conductor C2 are in contact with each other. Through the contact (contact), the end faces are pressed to be cold-welded. Since the first holding unit 11 and the second holding unit 12 in the close position do not approach each other any more, they temporarily shift to the pressure-released state (FIG. 3B), and the first holding unit 11 and the second holding unit 12 The holding portion 12 is moved to the Y direction release position to release the sandwiching of the flat conductor, and the first holding portion 11 and the second holding portion are moved to the X direction release position. Then, the first holding portion 11 holds the first flat rectangular conductor C1 so that the predetermined holding amount A1 is shifted and the second holding portion 12 holds the first holding member so that the protruding amount A2 protrudes. By holding the single rectangular conductor C2 and making a transition to the pressure contact state again, a plurality of pressings can be repeated for one joint portion.

  That is, the X direction release position is a position where the first holding portion 11 can teach the first flat conductor C1 to protrude by the protrusion amount A1, and the second holding portion 12 protrudes the second flat conductor C2. It is a position which can be made to project and hold by quantity A2.

  Note that the X-direction release position may not be a position where each of the flat conductors protrudes by the projection amounts A1 and A2 when the state is shifted to the sandwiching state (as it is) thereafter. In such a case, the first holding portion 11 and the second holding portion 12 may be moved to positions where the flat conductors respectively protrude by the protruding amounts A1 and A2 in the holding state, and then held.

  As shown in FIG. 3A, in addition to the movement restricting portion 17, the cold pressure welding apparatus 10 further moves the first flat conductor C1 and the second flat conductor C2 in the direction of separating along the X direction. It is good to provide the other movement control part (fixing member 16) which controls that the 1st flat angle conductor C1 and the 2nd flat angle conductor C2 move moving along with the direction of Y.

  As an example, the fixing member 16 is slightly wider than the thickness of the portion of the first flat conductor C1 and the second flat conductor C2 that are not plastically deformed, and is longer than the length of the joint portion CP in the plate thickness direction. Two sets of cylindrical projections 161 and 162 having a narrow interval, and a projection (or plate) having a set of regulating surfaces 163A provided outside both ends in the thickness direction of the joint (for example, prismatic shape) 163.

  Thereby, in the compression release state (FIG. 3B) or the retraction state (FIG. 2A), the first holding portion 11 and the second holding portion 12 are released in the Y direction and the X direction by the drive portion 13. This is the case where the first rectangular conductor C1 and the second rectangular conductor C2 are in close contact with the rectangular conductor holding grooves 111A, 112A, 121A, 122A when moved to the position or the Y direction separation position and the X direction separation position. However, the movement of the first flat conductor C1 and the second flat conductor C2 is restricted. Specifically, movement of the first flat conductor C1 in the direction (the right direction in the drawing) separated from the second flat conductor C2 along the X direction is restricted by the columnar projection 161, and the projection 162 The second rectangular conductor C2 is restricted from moving along the X direction in a direction away from the first rectangular conductor C1 (left direction in the drawing). Further, movement of the first flat conductor C1 and the second flat conductor C2 upward or downward in the figure along the Y direction is restricted by the projection 161 having the restriction surface 163A.

  In this manner, the first flat conductor C1 and the second flat conductor C2 can maintain the positions immediately after the pressure contact, and the stability of the bonding surface CP can be enhanced. Therefore, after the pressure contact, the first holding portion 11 and the second holding portion As a result, it is possible to prevent the joint CP from being separated along with 12.

  The fixing member 16 is not limited to the protrusion and the plate, and may be a rubber pressing member or the like.

  In the above embodiment, the first holding portion 11 and the second holding portion 12 stop at the X direction releasing position and the Y direction releasing position in the pressure release state, for example. Although the Y-direction release position passes, it may not stop at the position. That is, the first upper holding body 111 and the first lower holding body 112 (as well as the second upper holding body 121 and the second lower holding body 122) are not located between the holding position, the Y direction release position and the Y direction separation position. The first holding unit 11 and the second holding unit 12 may move without stopping between the proximity position, the X direction release position, and the X direction separation position. .

  In the past, cold pressure welding was used when joining round wires, but according to the cold pressure welding apparatus 10 of the present embodiment described above, good and stable cold pressure welding of rectangular conductors is performed. Can.

  Further, by using a coil piece as the rectangular conductor (the first rectangular conductor C1 and the second rectangular conductor C2), the cold pressure welding device 10 can be used as the coil manufacturing device 20. This will be described below.

  <Coil manufacturing device>

  <Coil manufacturing device / flat conductor (coil piece)>

  First, the flat conductor C used in the coil manufacturing apparatus 20 of the present embodiment will be described with reference to FIG. FIG. 5 is a top view of the wide surface WS of the rectangular conductor C. As shown in FIG. The flat conductor C is a plurality of strip-like flat conductors which have a linear shape (the same figure (a)) or at least one bent portion (the same figure (b) to (e)) and can form a spiral shape when they are continued. Hereinafter, these are called coil pieces. The coil pieces having the bent portion are bent in the same direction in the longitudinal direction of the belt so as to form a spiral shape when being continuous. Also, in the case of a coiled piece having a bend, it is preferred that the bend be preferably at least one non-curved (e.g. substantially perpendicular) shape.

  Moreover, in the following description, it is a helical structure in which a plurality of coil pieces (flat conductors) are made continuous (connected), and the helical structure before completion is also included as a coil (helical structure to be completed). Shall be That is, in the following description, the coil piece (flat conductor) includes a plurality of coil pieces of the smallest unit having a linear portion or a bent portion in the same direction in the longitudinal direction of 1 to 4 bands, and a plurality of coil pieces of the smallest unit. It includes a coil piece which is connected and in which a spiral structure of one or more rounds of a coil (to be completed) is formed. Also, for the sake of convenience of explanation, when it is necessary to distinguish between them, the coil piece of the minimum unit is called a unit coil piece, and a plurality of unit coil pieces are connected and completed as a coil (helical structure to be completed) The coil piece before the schedule is called a bonded coil piece, and the helical structure to be completed (finished state) is called a coil. Further, in the plurality of coil pieces, the shape of the cross section perpendicular to the longitudinal direction of the belt and the area thereof are all substantially the same.

  As shown in the figure, the unit coil piece C0 is formed into a shape having a straight or substantially right angled non-curved bent portion (corner portion) by punching a copper plate (for example, 1 mm thick) as an example. Ru. That is, in a top view of the wide surface WS, the unit coil piece C0 has a straight line (I-shaped) without the bent portion (FIG. (A)) and an L-shaped with one bent portion (FIG. (B)) U-shaped (U-shaped) having two bent portions (FIG. (C)), substantially C-shaped having three bent portions (FIG. (D)), having four bent portions, the same There is a C-shaped (generally O-shaped (approximately 字 -shaped)) (figure (e) in the figure) that is bent in a direction. In the following description, it is U-shaped, (abbreviated) C-shaped, approximately O-shaped It is assumed that the bent portions (corners) have a substantially right-angled shape.

  And a plurality of coil pieces (unit coil pieces and / or joined coil pieces) are completed in the helical longitudinal direction of the helical structure (coil) whose preparation length L0 which becomes the total distance of those strip longitudinal directions is to be completed It is set to be longer by a margin compared to the length. The margin is set to a shortened total distance shortened by pressing when all of the plurality of coil pieces are cold-welded. The preparation length L0, the completion length, the allowance, and the total reduction distance will be described in detail in the description of the method of manufacturing the coil described later.

  <Coil manufacturing device / holding part>

  The coil manufacturing apparatus 20 of the present embodiment is an example of the use of the above-described cold pressure welding apparatus 10, and therefore, the same configuration as that of the cold pressure welding apparatus 10 is denoted by the same reference numerals and redundant description is omitted, and in the following description. A configuration suitable for use in the coil manufacturing apparatus 20 will be mainly described.

  Referring again to FIG. 1, the coil manufacturing apparatus 20 includes a first holding part 11 and a second holding part 12 that are capable of holding a flat conductor and another flat conductor, and are disposed to face each other, A plurality of strip-like flat rectangular conductors (coil pieces) that can be helically shaped when connected together are joined together to form a helical structure to be a coil. The preparation length, which is the total distance in the longitudinal direction of the strip of the coil, is set to be longer by a margin compared to the completion length in the longitudinal direction of the spiral of the helical structure to be completed. The end faces of (coil pieces) are pressed along the longitudinal direction of the strip, and cold welding is performed while shortening the distance in the longitudinal direction of the strip, and all flat conductors (coil pieces) are shortened by cold pressure. Set the total distance to extra In the, and forms a helical structure.

  That is, in the coil manufacturing apparatus according to the present embodiment, the length of the coil piece (joining coil piece) held by the first holding portion 11 or the second holding portion 12 becomes longer as the number of joining (the number of joining) of the coil pieces increases. Therefore, the configuration of the first holding unit 11 and the second holding unit 12 is suitable for use in the manufacture of a coil.

  First, FIG. 6 is a schematic view of a coil piece being manufactured by the coil manufacturing apparatus 20. As shown in FIG. The figure (a) is a schematic diagram (top view) of the prepared unit coil pieces, and the figures (b) to (d) are development views of the unit coil pieces and joining coil pieces in the middle of manufacture. The figure (e) is an arrow view of the V direction of the figure (d).

  Here, as an example, a plurality (four in this case) of U-shaped (U-shaped) unit coil pieces C0 having two bent portions are prepared and connected (consecutively) to form a spiral shape of 2 turns The case where the coil (helical structure) 50 which consists of is manufactured is shown as an example. The two-dot chain lines at both ends of the coil piece in (b) to (d) in the same figure indicate the finished end of the finished coil, and in this example, the finished end does not change (the finish in the left and right direction in the figure) The position of the end does not move.

  First, in the first cold welding, as shown in FIG. 7B, one end face (shown by a circle) of each of the two unit coil pieces C01 and C02 is connected to each other to form a joined coil piece CC1. Then, in the next cold welding, one end face of the joining coil piece CC1 (one of the unjoined end faces of the unit coil pieces C01 and C02) and the unit coil piece C03 are cold-welded, and the joining coil piece CC2 is formed (the same figure (c)), and in the next cold welding, one end face of the joining coil piece CC2 (one of the unjoined end faces of the unit coil pieces C01, C02, C03) and the unit The coil piece C04 is cold-welded to complete the coil 50 (the same figure (d)).

  That is, the first holding portion 11 or the second holding portion 12 holds the bent (here, U-shaped) coil pieces and further increases the length of the joining coil pieces CC1, CC2,. Since there exist in the vicinity of the 1st holding part 11 or the 2nd holding part 12, it is necessary to make the 1st holding part 11 and the 2nd holding part 12 into composition which avoids interference with these coil pieces.

  FIG. 7 is a diagram for explaining the configuration of the first holding unit 11. FIG. 7A is a diagram showing one unit coil piece C0 in the first holding unit 11 (first upper holding body 111 and first lower holding body FIG. 12 is a view showing a state of holding by 112), and is a front view of the facing surface OS2 with the second holding unit 12. FIG. FIG. 4B is a front view of the coil 50 in a completed state as viewed from the axial center direction of the spiral structure, and the coil piece in FIG. 4A is a cross-sectional view taken along the line BB in FIG. It corresponds to the figure. Although the first holding unit 11 will be described here, the same applies to the second holding unit 12. Moreover, the same figure (c) is a front view (the AA line cross section arrow line view of the same figure (a)) of the 1st holding part 11. As shown in FIG.

  As shown to the figure (a) (b), when a coil piece has two or more bending parts (for example, in the case of a U-shaped (U-shaped) coil piece), it joins with the 1st holding part 11 There is a possibility that a region other than the coiled piece (in the same figure (a), a U-turn from the coiled piece C0 held by the first holding portion 11 and a coiled piece C0 'extending toward the front side interfere). In the present embodiment, in order to avoid this, the dimensions of the first holding portion 11 and the coil piece (the coil 50 to be completed) satisfy the following relationship.

  That is, when connecting a U-shaped (U-shaped) coil piece, one end of the first holding portion 11, specifically, one end surface 111S of the first upper holding body 111, and the same surface as this The end surface of the first lower support 112 and one end surface 112S of the first lower support 112, the end surface orthogonal to the facing surface OS2 is an internal space of the helical structure (a space intended to be an internal space of the helical structure (Hereinafter, this end surface is referred to as a spiral inner end surface IS). The helical portion end surface IS is, for example, the front of the first holding portion 11 close to the worker.

  Therefore, in order to avoid interference between the first holding portion 11 and the coil piece, the flat conductor holding grooves 111A and 112A of the first holding portion 11 need to be provided at appropriate positions. The distance d1 to the end (upper end in the same figure) of the rectangular conductor holding grooves 111A and 112A is a spiral along the third direction (Z direction in the figure: short side direction of the coil piece for cold welding) It shall be smaller than the distance D1 of the internal space of a structure (coil 50).

  In addition, the length d4 in the X direction of the first holding part 11 ((c) in the figure) is smaller than the distance D2 (in the same figure (b)) of the internal space of the spiral structure (coil 50) along the X direction. I assume.

  In addition, after cold-welding two coil pieces, the burr | flash 55 by extrusion arises in a connection part. Therefore, after completion of cold pressure welding, coil pieces (joined coil pieces) are taken out from the first holding portion 11 and the second holding portion 12 and deburred, and the coil pieces (joined coil pieces) and others (newly) Cold welding is performed between the coil pieces.

  FIG. 8 is a view corresponding to FIG. 7A (as viewed from the same direction), and shows a state in which the bonding coil piece CC is formed. In the coil manufacturing apparatus 20 of the present embodiment, the joining coil piece CC is formed on one side of the first holding portion 11 (the same as the second holding portion 12), here, the first lower holding body 112 side.

  On the other hand, since the rectangular conductor holding grooves 111A and 112A of the first holding portion 11 are linear grooves along the X direction, at the time of cold welding, only a portion of the linear shape including one end face of the joining coil piece CC Is held by the first holding unit 11. Therefore, in order to avoid the interference between the joined coil piece CC and the first holding portion 11 (first lower holding body 112), the coil piece (here, the joined coil piece CC) is spiraled, leaving the vicinity of the end face where cold welding is performed. Cold-welding is performed between the coil pieces held by the second holding unit 12 while being elastically deformed and / or plastically deformed so as to spread in the spiral direction of the structure (direction along the Y direction).

  The deformation amount D3 of the elastic deformation and / or plastic deformation in the spiral traveling direction of the coil piece (here, the joined coil piece CC) is set to an amount that avoids interference between the first holding portion 11 and the coil piece. In other words, the length (thickness) d5 along the Y direction of the holding body (here, the first lower holding body 112) on the side where the bonding coil piece of the first holding portion 11 is formed is the coil piece (here, the bonding The amount of deformation D3 allowed for elastic deformation and / or plastic deformation in the direction of spiral movement of the coil piece CC) is smaller than D3.

  Here, on the first lower support 112, on the front side in the direction of movement of the spiral of the helical structure (here, downward in the thickness direction of the coil pieces being joined; front side (operator side) in the Z direction) , And an interference avoidance space ES (see also FIG. 4). The interference avoidance space ES is a space in which a part of the bonding coil piece CC can be accommodated, and by providing this, a part of the bonding coil piece CC and the holding portion (here, the first lower holding body 112) that are joined together. Interference with) can be avoided. 8 and 4A, it is L-shaped in side view, but the first lower holding body 112 may be a flat plate having a thickness d5 (see FIG. 8), in which case Is the interference avoidance space ES.

  As described above, the coil manufacturing apparatus 20 according to the present embodiment forms a spiral structure by joining by cold pressure while elastically deforming and / or plastically deforming coil pieces in the spiral advancing direction (direction along the Y direction). is there. In addition, although coil pieces are connected (added) in a state of being spread in the advancing direction of the helix in the process of manufacturing by this, the helical structure is integrally formed (for example, after the helical structure is in a completed state) , Press, etc.) and perform elastic deformation and / or plastic deformation to be compressed in the advancing direction of the spiral to form a coil 50 in which the respective circumferences of the spiral are in close contact.

  The coil manufacturing apparatus 20 according to the present embodiment uses a coil piece that is longer by a compression amount (shrinkage amount) by cold compression (longer margin) based on the length after completion of the coil, and is compressed by cold compression (longer margin). Coil pieces are added while repeating contraction) to produce a coil of a desired length L.

  Therefore, in the cold pressure welding, the cold pressure welding is performed while measuring the distance in the strip longitudinal direction of the coil pieces. The distance in the longitudinal direction of the band is measured by, for example, providing a slip detection mechanism (not shown) in the first holding unit 11 and the second holding unit 12 (or in the vicinity thereof) to thereby hold the coil piece held by the first holding unit 11 By performing slip detection at the time of pressing of the coil piece (second coil piece) held by (the first coil piece) and the second holding unit 12, the distance in the band longitudinal direction can be measured. The distance in the longitudinal direction of the belt may be measured simultaneously with the cold welding (in real time) or before and after the cold welding (or before or after the cold welding). Thereby, the high precision of the coil dimension after completion is realizable.

  As shown in FIG. 7 (b), the substantially right-angled bent portion of the coil piece is a corner of the coil 50. That is, according to the coil manufacturing apparatus 20 of the present embodiment, by joining together the coil pieces configured to have bent portions substantially orthogonal by punching or the like, the corner portions on the inner peripheral side and the outer peripheral side are substantially perpendicular. Can be manufactured. In the past, a long rectangular conductor was wound to manufacture a coil with a rectangular conductor, but it is inevitable that at least the corner on the inner circumferential side of the coil has a curved shape in winding, and the space factor There is a limit to the improvement of heat and the heat dissipation.

  However, according to the coil manufacturing apparatus of the present embodiment, since the shape formed by punching can be joined as it is, the corner portion of a right angle (approximately right angle) can be realized also on the inner peripheral side of the coil, and the space factor is improved. It is possible to manufacture a coil which can be improved and the heat dissipation can be improved by eliminating the extra space.

  In particular, the joint portion CP is provided on the straight portion avoiding the bent portion (corner portion). That is, pressure welding is performed using the linear portion of the coil piece. As a result, it is possible to improve the shape accuracy of the bent portion, and, for example, it is possible to maintain the corner portion which is formed at right angle (approximately right angle) in punching.

  <Coil manufacturing method>

  Next, the coil manufacturing method of the present embodiment will be described. The coil manufacturing method of the present embodiment can be implemented, for example, in the above-described coil manufacturing apparatus 20.

  That is, in the coil manufacturing method of the present embodiment, a plurality of strip-shaped flat rectangular conductors (coil pieces) which can form a helical structure when being continuous are prepared, and a preparation is made to be the total distance of the plurality of rectangular conductors (coil strips) in the strip longitudinal direction. The length L0 is set to be longer by a margin M as compared with the completed length L of the helical structure (coil) to be completed, and the end faces of a plurality of flat conductors (coil pieces) Press along the longitudinal direction of the strip to cold press while shortening the distance in the longitudinal direction of the strip, and reduce the total distance S by which all of the flat conductors (coil pieces) are shortened by cold welding By setting, a plurality of flat conductors (coil pieces) are joined to form a spiral structure (coil).

  Specifically, referring to FIG. 9, four U-shaped (U-shaped) unit coil pieces C0 having two bent portions (C01 to C04) are prepared and connected (consecutively) The case of manufacturing a coil (helical structure) 50 having a spiral shape of two turns will be described as an example. 6A is a top view of the coil pieces C01 to C04, FIG. 6B to FIG. 6D are development views of the connecting coil pieces, and a broken line in FIG. The axial center of the helical structure of the coil 50 (the center of the joint CP) is shown. In addition, the alternate long and two short dashes lines at both ends of the coil piece in (b) to (d) in the same figure show the finished end of the finished coil, and in this example, the finished end does not change ( The position of the finished end does not move).

  Assuming that the lengths of the unit coil pieces C01 to C04 in the longitudinal direction of the belt are L01 to L04, respectively, the preparation length L0, which is the total distance in the longitudinal direction of the belt, is L01 + L02 + L03 + L04. The preparation length L0 is set to be longer than the completed length L of the coil 50 in the longitudinal direction of the coil by a margin M (L0 = L + M). When the unit coil piece C01 and the unit coil piece C02 are pressed along the longitudinal direction of the strip and cold-welded, the length L01 of the unit longitudinal direction C01 is compressed to L01 ′ (shortened The amount of compression is the distance S1 from the center of the joint CP), and the length L02 of the unit coil segment C02 is compressed to L2 ′ (the amount of shortening (compression) is the distance S2 from the center of the joint CP) Length is carried out to form a joined coil piece CC1 (length LC1) (FIG. 7 (b)), and an end face of the joined coil piece CC1 (end face of the unit coil piece C01 or C02 not joined) When the unit coil piece C03 is cold-welded, the unit coil piece C03 is compressed to L03 ′ by these pressure (the amount of shortening (compression) is the distance S3 from the center of the bonding portion CP), and the bonding coil piece CC1 is , L (The shortening (compression) amount is the length of the distance S4 from the center of the joint portion CP) to form the joined coil piece CC2 ((c) in the same figure), and the end face of the joined coil piece CC2 ( When the unit coil piece C04 is cold-welded to the end face of the unit coil piece C01, C02, C03 which is not joined, the unit coil piece C04 is compressed to L04 ′ by these presses (the amount of shortening (compression) is Bonded coil piece CC2 is compressed to LC2 ′ ((the amount of shortening (compression) is the length of distance S6 from the center of the joint CP) from the joint CP center to the completed coil length in the spiral longitudinal direction) The coil 50 (helical structure) of L (length from the start point ST to the end point ET) is completed (the same figure (d)) Coil pieces (unit coil pieces and / or joined coil pieces) are joined together to form the coil 50 Coil until it is completed The total of amount of shortening (shortening total distance S = S1 + S2 + S3 + S4 + S5 + S6) corresponds to the margin M.

  The manufacturing method of the coil of this embodiment is demonstrated anew along a time series. First, based on the length L of the coil 50 in the completed state, the lengths L01 to L04 of the unit coil pieces are set so that the total reduction distance S = the allowance M, and the compression amounts S1 to S1 by cold pressure welding are set. S6 is set.

  Then, using the coil pieces set in this manner, the end faces of the unit coil piece C01 and the unit coil piece C02 are pressed by the set compression amount S1 and S2 and added by cold pressure welding to form a joined coil piece CC1 Do. The compression amounts S1 and S2 at this time are grasped by measuring the distance in the longitudinal direction of the two coil pieces by detecting the slip when the unit coil piece C01 and the unit coil piece C02 are pressed. The method of grasping the amount of compression is the same as in the following cold welding.

  After cold welding of one joint region (for example, near the end face where the unit coil piece C01 and the unit coil piece C02 are to be joined), burrs are generated by pressing in the joint portion. I do.

  Next, the spiral advancing direction of the helical structure to be completed leaving the vicinity of the end face (end face of unit coil piece C01 or unit coil piece C02 not joined) in which the coil piece (joining coil piece CC1) is cold-welded While being elastically deformed and / or plastically deformed, cold welding is performed with another coil piece (unit coil piece C03). At this time, the deformation amount of the elastic deformation and / or plastic deformation in the spiral traveling direction of the bonding coil piece CC1 includes the first holding part 11 and the second holding part 12 that hold the coil piece during cold pressure welding, and the bonding coil piece. It is set to an amount to avoid interference with CC1. Further, the amount of deformation is the same in the following cold welding.

  Thereafter, the coil pieces are added similarly. That is, the end face of the joining coil piece CC1 (the end face of the unit coil piece C01 or C02 not joined) and the unit coil piece C03 are pressed by the set compression amount S3, S4 and joined by cold pressure welding The coil piece CC2 is formed. Thereafter, deburring of the bonding region is performed, and the bonding coil piece CC2 is elastically and / or plastically deformed in the spiral advancing direction of the helical structure to be completed leaving the vicinity of the end face to be cold welded. The end face of the CC2 and the unit coil piece C04 are pressed by the set compression amount S5, S6 for joining by cold pressure welding to obtain a completed helical structure.

  FIG. 10 is a diagram illustrating an example of a completed spiral structure 50 ′ (the number of turns of the coil is different from that of the above-described embodiment). FIG. 10 (a) is a front view as viewed from the helical axis direction, FIG. 10 (b) is an arrow view (side view) in the V direction before forming, and FIG. 10 (c) (d) is after forming Side view of FIG.

  The completed helical structure 50 'is formed by pressing or the like. That is, in order to avoid buffer with the first holding portion 11 and the second holding portion 12 during cold pressure welding, elastic deformation and / or plastic deformation in the spiral traveling direction of the spiral structure allows each space between the spirals to be deformed. Since an unnecessary and nonuniform spread (space) is formed on the surface, elastic deformation and / or plastic deformation in the direction of spiral movement of the spiral structure are possible to compress the spiral, and each circumference of the spiral can be different. As close as possible (close) (Figure (c)).

  Further, if necessary, in accordance with the shape of the stator core, it is concave or convex in the axial center direction of the helical structure (the radial direction of the stator core), that is, as shown in FIG. The peripheral end is formed into a curved shape that is not flush with the outer peripheral end.

  Thereafter, the molded spiral structure is immersed in a liquid insulating resin and integrally covered with the insulating resin. In addition, you may coat | cover with an insulating resin integrally by spraying a liquid insulating resin to the helical structure after shaping | molding. Conventionally, after covering a long wire for the completed length of a coil with an insulating resin, this is wound to form a spiral structure. However, in this case, in the vicinity of the outer periphery of the curved portion of the winding, the insulating resin is stretched and the coating thickness becomes thin, which causes the deterioration of the pressure resistance. Further, for example, when coating with an insulating resin before the above molding, the same problem occurs because the coating thickness of the insulating resin varies depending on the press. In this embodiment, since the helical structure molded into the shape attached to the stator core is integrally covered with the insulating resin after molding, the uniformity of the film thickness of the insulating resin can be enhanced. Moreover, since it coat | covers integrally with insulation resin after shaping | molding, helical structures can be adhere | attached by insulation resin, and film thickness can be coat | covered with a uniform film thickness.

  <Modification of coil piece>

  FIG. 11 is a view showing an example of connection in the case where the shapes of the coil pieces are different.

  The same figure (a) is a top view which shows the example of a connection by a L-shaped coil piece, and, here, the case where the connection coil piece for 1 round is comprised, using four L-shaped coil pieces C0. It shows. Although illustration is omitted for convenience of explanation, also in this case, the preparation length L0 which becomes the total distance in the longitudinal direction of the strip in each coil piece is the completion length in the helical longitudinal direction of the helical structure (coil) to be completed The margin M is set to be longer than the margin L by a margin M. The margin M is set to a shortened total distance S which is shortened by pressing when all of the plurality of coil pieces are cold-welded.

  In addition, it is not necessary to configure all the coil connection pieces for one round with the same shape (L-shape). That is, it is good also as a coil connection piece for 1 round by combining the I-shaped (straight line shape) or U-shaped (U-shaped) coil piece in L shape.

  FIG. 4B is a top view showing a connection example in which a C-shaped coil piece C0 and an I-shaped coil piece C1 are combined. Although illustration is omitted for convenience of explanation, also in this case, the preparation length L0 which becomes the total distance in the longitudinal direction of the strip in each coil piece is the completion length in the helical longitudinal direction of the helical structure (coil) to be completed The margin M is set to be longer than the margin L by a margin M. The margin M is set to a shortened total distance S which is shortened by pressing when all of the plurality of coil pieces are cold-welded.

  Moreover, it is good also as a coil connection piece for 1 round by combining a substantially C-shaped coil piece with three corner | angular parts, and an L-shaped coil piece. Further, the coil pieces constituting the first and second turns of the spiral structure may be different combinations.

  FIG. 4C shows a U-shaped (U-shaped) coil piece C0 having two corners and a coil piece (O-shaped (b-shaped) coil for one round of the spiral structure to be completed. It is an expanded view in the case of forming a joining coil piece in combination with piece) C1. The two-dot chain lines at both ends of the coil piece in the figure indicate the finished end of the finished coil, and in this example, the finished end does not change (the position of the finished end does not move in the horizontal direction in the figure) It explains as a thing.

  The joint portion of the O-shaped coil piece C1 is cut. When one end of the U-shaped coil piece C0 and one end of the O-shaped coil piece C1 are cold-welded, the U-shaped coil piece C0 has a compression amount S0, and the O-shaped coil piece C1 has a compression amount S1. This can be compressed and repeated to form a helical structure. In FIG. 9 (when the U-shaped coil piece C0 having the same length is used), as shown in the figure, the joint portion CP has substantially the same position along the axial center of the helical structure at each circumference of the helical structure. In the case of FIG. 11C, the connection portion CP is formed at a position deviated by a predetermined amount along the axial center (broken line) of the helical structure at each periphery of the helical structure. Ru.

  <Modification of coil>

  FIG. 12 is a view showing a modified example of the coil manufacturing apparatus and the coil manufacturing method. FIG. 10A is a schematic view of a coil manufacturing apparatus 20 ′, and FIG. 10B is a side view corresponding to FIG. 10C of a coil 50 manufactured thereby. c) is a perspective view of the coil 50. FIG.

  As shown to the figure (a), coil manufacturing apparatus 20 'is provided with two or more holding | maintenance units 22 which consist of the above-mentioned 1st holding | maintenance part 11 and 2nd holding | maintenance part 12, and several holding | maintenance units 22 (22A-22E) are. Each of the first holding part 11 and the second holding part 12 has a different width W (width along the Z direction, width in the short width direction of the rectangular conductor) of the rectangular conductor holding grooves 111A, 112A, 121A, 122A (increase sequentially). (Or may be smaller).

  As described above, by using the plurality of holding units 22 having different widths W of the rectangular conductor holding grooves 111A, 112A, 121A, and 122A, it is possible to join the rectangular conductors having different widths (widths WA to WE in the drawing). That is, while moving sequentially between the plurality of holding units 22, a cold structure is formed with a different holding unit 22 for each circumference of the helical structure, thereby forming a helical structure having a different length for each circumference of the coil. it can. That is, using U-shaped (U-shaped) unit coil pieces having the same length in the longitudinal direction of the belt, the coil pieces are joined by cold pressure welding while sequentially moving between the plurality of holding units 22. Thus, the coil 50 (FIGS. 5B and 5C) having a quadrangular frustum outer shape can be formed.

  A plurality of holding units 22 having different depths d3 of the flat conductor holding grooves 111A, 112A, 121A, and 122A may be used. In that case, the plate thickness of each circumference of the spiral structure constituting the coil 50 can be varied.

  <Coil>

  Next, the coil of the present embodiment will be described with reference to FIG. FIG. 13 (a) is a front view seen from the axial center direction of the helical structure, and FIG. 13 (b) is a cross-sectional view taken along the line A-A in FIG. 13 (a). Further, FIG. 7 (c) is a side view of FIG. 7 (a) viewed from the V direction.

  The coil 50 according to the present embodiment is composed of a spiral structure in which strip-shaped rectangular conductors (coil pieces) are continuous in a spiral shape, and as shown in FIG. It has a non-curved corner (a substantially right-angled corner) 50C. Here, as an example, it is manufactured using the above-described coil manufacturing apparatus and coil manufacturing method.

  In the case of a coil formed by winding a long flat conductor longer than one turn of the helical structure of the conventional complete coil, it is inevitable that the bent portion becomes a curved structure, and when attached to the stator core It creates a large space. Since the heat retention effect is enhanced in the blank portion, there is a limit to the improvement in heat dissipation of the coil. In addition, when a long flat rectangular conductor is covered with an insulating resin and then wound, there is a problem that the thickness of the covering of the insulating resin becomes thin at the bent portion, and the pressure resistance deteriorates.

  On the other hand, since the coil 50 of this embodiment can form the shape for 1 round of the helical structure of a coil by stamping, it can form the coil of a desired shape in a plain view. That is, along the shape of the stator coil, a coil 50 (with at least the inner circumferential corner 50C being at right angles or near right angles) having a shape as close as possible to this is obtained. This makes it possible to minimize the space between the stator core 60 (shown by a broken line in FIG. 6A), unlike the coil of the winding method. For example, the length of the space (the distance from the inner peripheral side of the coil 50 to the stator core 60) can be reduced to 0.5 mm to 1.0 mm per side of the coil 50, whereby the heat dissipation can be improved. Further, since the insulating resin can be coated with enhanced uniformity over the entire coil 50, it is possible to suppress the deterioration of the withstand voltage due to the variation of the film thickness of the insulating resin.

  Further, in the coil 50 of the present embodiment, the width perpendicular to the spiral traveling direction of the spiral structure (the width W1 in the short side direction of the coil piece) is widened at the corner portion to become the width W2, and this also reduces the coil resistance. can do.

  Furthermore, since the cold welding is a metal atomic bond, the connecting portion is reliably bonded to such an extent that it cannot be visually recognized. Thereby, the stability of the connection portion can be overwhelmingly enhanced as compared with a configuration in which a coil for one rotation (or less) is planarly connected with an adhesive (fixing material, brazing or the like).

  Further, as shown in FIG. 5B, the first circumference of the spiral of the helical structure (for example, the first circumference by the joined coil piece CC1) is partially formed and the flat conductor (coil piece) of the other part is formed. A first thin portion T1 having a thickness D8 thinner than the thickness D7 is provided. Further, the second circumference (for example, the second circumference by the joined coil piece CC2) continuous to the first circumference is partially in the plate thickness D8 rather than the plate thickness D7 of the flat conductor (coil piece) than the other portions. A thin second thin portion T2 is provided.

  As described above, the coil pieces are sandwiched by the first holding part 11 and the second holding part 12 of the coil manufacturing apparatus 20 during the cold pressure welding, but at this time, the total depth of the rectangular conductor holding grooves 111A and 112A ( The total depth of the rectangular conductor holding grooves 121A and 122A is also smaller than the plate thickness D7 of the coil piece. Then, the coiled piece is held between the first holding portion 11 and the second holding portion 12 by being pressed by the pressing portion 18, so that the holding portion has a thickness about the same as the total depth of the rectangular conductor holding grooves 121A and 122A (D8 ) Is compressed in the thickness direction. The sandwiched portions between the first holding part 11 and the second holding part 12 are the first thin part T1 and the second thin part T2. That is, the first thin-walled portion T1 and the second thin-walled portion T2 are formed corresponding to the bonding portion CP of cold pressure welding, and for example, U-shaped (U-shaped) coil pieces are connected In the case of the coil, the first thin portions T1 are provided at two places in the first circumference, and the second thin portions T2 are also provided at two places in the second circumference. Further, when the lengths of the U-shaped unit coil pieces are all the same, the first thin portion T1 and the second thin portion T2 are overlapped in the axial center direction of the spiral structure as indicated by a broken-line square. Provided in

  In addition, as shown in FIG. 11, the first thin portion T1 and the second thin portion T2 formed corresponding to the joint portion CP of cold pressure welding have U-shaped (U-shaped) and O-shaped coil pieces. In the case of a combination of (shape of L), it is formed at a position alternately shifted between the first circumference and the second circumference corresponding to the connection portion CP (in the case of the O-shaped coil piece And a thin portion is formed at only one place in one cycle).

  The coil 50 is integrally covered with an insulating resin on the entire circumference of the spiral structure. Thereby, the adhesiveness of each circumference of a spiral structure can be improved. Further, the gap SP of the coil piece is formed between the first thin portion T1 and the second thin portion T2, but a part of the insulating resin is also embedded in the gap SP. That is, as described in the above-described manufacturing method, since the helical structure is immersed in the liquid insulating resin after completion of the helical structure (which is molded as necessary), the insulating resin intrudes into the gap portion SP. Thereby, the adhesion of each circumference of the spiral structure can be further enhanced.

  Further, the coil 50 is formed in a concave or convex shape in the axial center direction of the helical structure (the radial direction of the stator core) according to the shape of the stator core 60, that is, as shown in FIG. The peripheral end may be formed in a curved shape that is not flush with the outer peripheral end.

  FIG. 14: is the figure which measured and compared the emitted-heat amount of the coil 50 of this embodiment, and the coil (round wire coil) comprised by winding round wire. About the round wire coil and the coil 50 of this embodiment, the emitted-heat amount (temperature) with time passage was measured at 5V and 20A.

  The experiment was stopped because the temperature of the round wire coil rapidly rose to 28.5 ° C. in 10 seconds and to 42 ° C. in 30 seconds and to 73 ° in 90 seconds from the start. On the other hand, the coil 50 (20A) of the present embodiment gradually rises in temperature at 21.1 ° C. in 10 seconds and 21.5 ° C. in 30 seconds, and becomes saturated at 32.4 ° C. after 1530 seconds from the start became.

  As is clear from this result, the coil (a coil having a substantially perpendicular inner circumference (inner circumference right-angled coil)) 50 of this embodiment has a temperature close to normal temperature (for example, 40 ° C. to 50 ° C.) It can be said that the heat dissipation is very high, though there is almost no temperature rise. And by such high heat dissipation, coil resistance can be greatly reduced compared with the past.

  Further, as shown in FIG. 6B, the width W3 of the start and end portions of the spiral structure of the coil 50 may be wider than the width W1 in the band width direction. Thereby, like the corner portion, the coil resistance at the start end portion and the end end portion can be reduced.

  In addition, in this embodiment, the coil 50 of the inner periphery right angle | corner which formed the end surfaces of the coil pieces by joining repeatedly by cold pressure welding was demonstrated. However, the present invention is not limited to this, and the end faces of the coil pieces may be joined by other joining methods. Specifically, various connection methods such as ultrasonic welding (high frequency welding), electric welding, and brazing can be employed.

  <How to attach to stator core>

  The example of attachment to the stator core of the coil 50 of this embodiment is demonstrated with reference to FIG. FIG. 15 (a) is a side view of the coil 50 and the cassettes 51A, 51B. FIG. 15 (b) is a top view of FIG. 15 (a). FIG. 15C is a side view top view showing an example of attachment to the stator core 60.

  Helical axis The coil 50 of the present embodiment is molded along the outer shape of the stator core as shown in FIG. 13C, and after molding, is integrally covered with an insulating resin, and this is attached to the stator core by so-called retrofit.

  Therefore, for example, as shown in FIG. 6A, two cassettes 51A and 51B having flanges 52A and 52B on one surface side in the axial center direction of the helical structure of the coil 50 are prepared. The coil 50 is inserted from the surface side where the flange portion 52A is not formed, and the other cassette 51B is overlapped to engage both. Then, the cassette coil 50 is inserted into the stator core 60. The cassettes 51 </ b> A and 51 </ b> B are provided with notches or engaging portions 53 so as to fit in the top view shown in FIG.

  In addition, as shown to the same figure (c), the coil 50 may be attached to one cassette 51C which has the collar part 52C only in the one surface side of the axial center direction of a helical structure, and may be attached to the stator core 60. In that case, in order to prevent the coil 50 from coming off (or causing unnecessary movement (vibration)) from the stator core 60 due to the centrifugal force at the time of operation, the stator core 60 is provided with the notch 61 and the cassette coil 50 is used as a stator core After mounting to 60, it is good to fit with the retaining ring 62 which covers the upper direction of the coil 50 with a cassette, and the notch 61 of the stator core 60. As shown in FIG.

  As described above, the present invention is not limited to the above-described embodiment, and can be configured in various embodiments. For example, the bent portion of the coil piece may have a curved shape.

  In addition, one coil piece is not limited to one formed by punching a single copper plate, and a plurality of narrow rectangular conductors (for example, flat rectangular conductors whose cross-sectional shape in the longitudinal direction of the band is square) in the strip width direction of the coil It may be arranged in parallel. In addition, the coil may be partially formed by a coil piece formed by punching a single copper plate, and a portion may be formed by a coil piece formed by parallel arrangement of narrow rectangular conductors.

  The present invention can be used, for example, when manufacturing a coil device using a flat coil.

DESCRIPTION OF SYMBOLS 10 Cold welding apparatus 20 Coil manufacturing apparatus 11 1st holding part 12 2nd holding part 50 Coil

Claims (7)

A plurality of Hirashirube of strip pressed against a manufacturing method of a coil for forming a helical structure,
The plurality of flat conductors can form a spiral structure in a virtual state (hereinafter referred to as a "virtual spiral structure") when the end faces are arranged in contact with each other such that the longitudinal direction of the bands aligns in the spiral traveling direction. ,
The length of one turn of the virtual spiral structure is set to be longer than the length of one turn of the spiral structure by the pressing amount of pressure contact,
The region corresponding to one turn of the virtual spiral structure includes a first straight portion extending in a first direction, a second straight portion extending in a second direction, the first straight portion, and the second straight portion. Between the two sides,
In the region to be the straight portion excluding the corner portion, one of the flat conductor and the other flat conductor butts the end faces of each other and presses them along the longitudinal direction of the band to shorten the distance and press Forming a connecting flat conductor, and matching the length of one round of the connecting flat conductor with the length of one round of the helical structure,
A method of manufacturing a coil, characterized by The one of the flat conductors, while the elastic deformation and / or plastically deformed in a helical traveling direction of the helical structure leaving near the end face, pressed against said other flat conductors,
The method for manufacturing a coil according to claim 1. The amount of deformation of the elastic deformation and / or the plastic deformation is set to an amount that avoids interference between the flat conductor and a holding portion that holds the flat conductor at the time of pressure contact .
The manufacturing method of the coil of Claim 2 characterized by the above-mentioned. At least one of the flat conductors constituting one circumference of the virtual spiral structure has at least one corner.
The method for manufacturing a coil according to any one of claims 1 to 3, wherein: A coil manufacturing apparatus for forming a helical structure by joining a plurality of strip-like flat conductors ,
The plurality of flat conductors can form a spiral structure in a virtual state (hereinafter referred to as a "virtual spiral structure") when the end faces are arranged in contact with each other such that the longitudinal direction of the bands is aligned in the spiral traveling direction . ,
The length of one turn of the virtual spiral structure is set to be longer than the length of one turn of the spiral structure by the pressing amount of pressure contact,
The region corresponding to one turn of the virtual spiral structure includes a first straight portion extending in a first direction, a second straight portion extending in a second direction, the first straight portion, and the second straight portion. Having a corner connecting the two,
A first holding portion and a second holding portion that can sandwich one flat conductor and the other flat conductor and are disposed facing each other;
A drive unit for moving the first holding unit and the second holding unit;
The first holding portion and the second holding portion abut each other on the end faces of the one flat conductor and the other flat conductor in a region which becomes the straight portion excluding the corner portion, and the band longitudinal direction Forming a connection flat conductor having a length corresponding to the length of one turn of the spiral structure by pressing along the length and pressing the pressure while shortening the distance .
Coil manufacturing apparatus characterized in that . The one flat conductor is brought into pressure contact with the other flat conductor while being elastically and / or plastically deformed in the spiral traveling direction of the helical structure , leaving the vicinity of the end face .
The coil manufacturing apparatus according to claim 5. A plurality of holding units comprising the first holding part and the second holding part are provided ,
Forming the helical structure while sequentially moving between the plurality of holding units;
The coil manufacturing apparatus according to claim 5 or 6, characterized by the above.

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