JP6841445B2 - Coil manufacturing equipment, coil manufacturing method and coil - Google Patents

Description

The present invention relates to a coil manufacturing apparatus using a conductor, a coil manufacturing method, and a coil.

Examples of the coil device in which the coil is arranged around the core (stator core) of the stator core (stator) include electrical equipment such as a motor, a generator, and a transformer. In such a coil device, low loss occurs. It is important to improve the space factor of the coil in the core in order to reduce the size and size.

As a coil capable of improving the space factor in the core, a coil using a flat conductor (hereinafter referred to as a flat coil) has been conventionally known. A flat coil is also called a flat winding coil, a square coil, an edgewise coil, or the like, and is a coil wound with a round conducting wire having a substantially circular cross-sectional shape orthogonal to the long direction. A coil wound around a flat conductor having a rectangular cross-sectional shape orthogonal to the long direction.

Further, as a method for manufacturing a flat coil, a method of winding a long flat lead wire (square lead wire) in a substantially rectangular shape is known (see, for example, Patent Document 1). It is also known how to stack flat conductors (flat conductive materials) with the length of one turn of a coil, superimpose the upper end upper surface of the lower stage and the lower surface of the start end of the upper stage, and repeat them by joining means to form a spiral structure. (See, for example, Patent Document 2).

Further, as a method for connecting conductors, a cold pressure welding method is known.

Japanese Patent No. 3881520 Japanese Unexamined Patent Publication No. 2005-130676

However, in the method of winding a long flat wire into a substantially rectangular shape as in the technique described in Patent Document 1, the corners (both the outer peripheral side and the inner peripheral side) are curved to form a rounded corner. It is inevitable that it will become. Since the core is generally a prismatic column having substantially right-angled corners, if a coil having a rounded corner is arranged around the core, a space is created between the core and the coil. Since heat is accumulated in this space during operation of the coil device, the heat dissipation of the coil device deteriorates, and there is a problem that the efficiency of the coil device cannot be improved due to an increase in 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 circumference of the flat wire used for the coil is coated with an insulating resin in advance, there is a problem that when the coil is wound, the coating is thinned by bending at the corner on the outer circumference side, and the withstand voltage of the coil device is lowered. there were.

On the other hand, in the case of the method of laminating and joining flat conductors for one turn of a coil as in the technique described in Patent Document 2, it is possible not to bend the corners, and the heat dissipation property and space factor described above can be obtained. Problem can be avoided. However, even though they are connected by joining means, it is inevitable that the characteristics of the joint between the upper end of the lower stage and the lower surface of the start end of the upper stage will deteriorate compared to the uncut part, and the operation will be stabilized. The problem remains in terms of.

Further, as one of the methods for connecting conductors to each other, a method of cold-pressing round wire conductors to each other is known. However, flat-angle conductors are satisfactorily cold-pressed to each other with improved stability of the connecting portion. It was difficult.

Further, it cannot be said that sufficient studies have been made from the viewpoint of improving mass productivity in the coil manufacturing apparatus and the coil manufacturing method for manufacturing the coil by continuously pressing and contacting a plurality of conductors.

INDUSTRIAL APPLICABILITY The present invention provides a coil manufacturing apparatus, a coil manufacturing method, and a coil capable of mass production of a coil capable of improving the space factor and heat dissipation and avoiding deterioration of characteristics due to cutting and joining. The purpose.

The present invention solves the above problems by the following means.

The present invention is a coil manufacturing apparatus for forming a spiral structure by splicing a plurality of strip-shaped conductors that can form a spiral shape when continuously formed, and the conductor and the other conductors can be sandwiched between the conductors and each other. It has a first holding portion and a second holding portion that are arranged to face each other and can move in the first direction, and the first holding portion and the second holding portion are respectively along the second direction. A single holding body composed of a first holding body and a second holding body that can be moved, and is composed of one end face of the first holding body and one end face of the second holding body. The end face relates to a coil manufacturing apparatus characterized in that it is located in a space inside the spiral structure.

Further, in the present invention, a plurality of strip-shaped conductors that can form a spiral structure when continuously prepared are prepared, and another conductor (hereinafter referred to as "the previous conductor") is combined with one of the conductors or a connection of the plurality of conductors (hereinafter referred to as "the previous conductor"). Hereinafter, a method for manufacturing a coil for connecting (hereinafter referred to as "rear conductor"), wherein the former conductor is deformed in the spiral traveling direction of the spiral structure in at least a part of a region other than the vicinity of the end portion. in presses butting the end face of the conductor after the the end surface of the target conductor to the helical direction of travel, the end of the destination of the conductor connected to the ends of the conductor after the, wherein the It relates to a method for manufacturing a coil.

Further, in the present invention, a plurality of strip-shaped conductors that can form a spiral structure when continuously prepared are prepared, and another conductor (hereinafter referred to as "the previous conductor") is combined with one of the conductors or a connection of the plurality of conductors (hereinafter referred to as "the previous conductor"). Hereinafter, a method for manufacturing a coil for connecting a "rear conductor"), wherein the former conductor has at least a first side and a second side which are opposite sides in the spiral structure. When at least a part of the first side is held by the holding portion of the connecting device, the second side is displaced from the first side along the axial direction of the spiral structure. In the state of being deformed in the spiral traveling direction as described above, there is a step of connecting the end portion of the front conductor to the end portion of the rear conductor, and the second side is shifted with respect to the first side. The amount of deformation relates to a method for manufacturing a coil , which is larger than the thickness of the conductor.

Further, the present invention is a method for manufacturing a coil in which a plurality of strip-shaped flat conductors that can form a spiral structure when continuously prepared are prepared, and end faces of the plurality of flat conductors are joined to form the spiral structure. A pressure welding process in which one end face of the first flat conductor in the longitudinal direction of the band and one end face of the second flat conductor in the longitudinal direction of the band are butted and pressed, and the pressing intersects the longitudinal direction of the band and the short side of the band. The present invention relates to a method for manufacturing a coil, which comprises a removing step of removing burrs protruding in the direction of the coil.

According to the present invention, there is provided a coil manufacturing apparatus, a coil manufacturing method, and a coil, which can improve the space factor and the heat dissipation, and can mass-produce a coil in which characteristic deterioration due to cutting and joining is avoided. be able to.

(A) It is an external view (front view) which partially schematically showed the structure of the cold pressure welding apparatus which concerns on this embodiment. (B) It is a top view of a flat conductor. (C) is a cross-sectional view taken along the line AA of FIG. 1 (b). It is external view (front view) which showed typically the holding part of the cold pressure welding apparatus which concerns on this embodiment. It is external view (front view) which showed typically the holding part of the cold pressure welding apparatus which concerns on this embodiment. It is a side view which shows typically the holding part of the cold pressure welding apparatus which concerns on this embodiment. It is a top view which shows the flat conductor which concerns on this embodiment. It is a schematic diagram which shows the state 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, is (a) a side view of a holding part, (b) is a front view of a coil, (c) is a front view of a holding part. It is a side view of the holding part of the coil manufacturing apparatus which concerns on this embodiment. It is a schematic diagram explaining the coil manufacturing method which concerns on this embodiment. It is a schematic diagram explaining the coil manufacturing method which concerns on this embodiment. This is a modified example of the coil piece according to the present embodiment. It is a figure explaining the modification of the coil manufacturing apparatus and the coil manufacturing method which concerns on this Embodiment. It is a figure explaining the coil which concerns on this embodiment, is (a) a front view, (b) a sectional view, and (c) a side view. It is a figure which shows the experimental result about the calorific value of the coil which concerns on this embodiment, and the coil of a conventional example. It is a figure explaining the attachment method to the status core of the coil which concerns on this Embodiment, is (a) side view, (b) is the sectional view of the figure (a), (c) is the figure (a). It is a cross-sectional view of. It is a side view which shows the spiral structure of the coil which concerns on this embodiment. It is a figure which shows the spiral structure of the coil which concerns on this embodiment, is (a) external perspective view, (b) side view, (c) external perspective view, (d) side view.

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

<Cold pressure welding device>
FIG. 1 is a diagram for explaining the cold pressure welding device 10 according to the present embodiment, and FIG. 1 (a) is an external view (front view) showing a part of the configuration of the cold pressure welding device 10 schematically. Yes, FIG. (B) is a top view of the flat conductor C, and FIG. 1 (c) is a sectional view taken along line AA of FIG. 1 (b).

As shown in FIG. 3A, the cold pressure welding device 10 is a device for cold pressure welding two flat conductors C (C1 and C2), and the first holding portion 11 and the second holding portion 12 are held together. Have. In the following description, the flat conductor C means a strip-shaped (tape-shaped) conductor formed in a plane with respect to the round wire conductor, as shown in FIGS. (B) and (c). That is, as shown in FIGS. (B) and (c), the flat conductor is a strip-shaped member having two wide surfaces WS facing each other and two narrow surfaces WT facing each other and long in a predetermined direction. , A conductor having a cross section orthogonal to the band longitudinal direction BL (A-A line cross section in FIG. 3B) is a rectangular or rounded rectangular conductor as shown in FIG. In the following description, as an example of a flat conductor, a flat conductor having a rectangular cross section orthogonal to the longitudinal direction of the band (upper view of FIGS. (B) and (c)) will be described as an example. The flat conductor C in the present invention may be a strip-shaped conductor formed in a plane with respect to the round wire conductor, and has a substantially square cross-sectional view in the AA line cross section of FIG. It may be.

The first holding portion 11 is movable along the first direction (longitudinal direction of the band of the flat conductor; the X direction in the figure (a)), and is formed by the first upper holding body 111 and the first lower holding body 112. It is composed. The first upper holding body 111 and the first lower holding body 112 are arranged so as to have the facing surfaces 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 the first upper holding body 111, and the lower holding body shown in the drawing is referred to as the first lower holding body 112. Not limited to above and below. That is, FIG. 1A may be a top view of the cold pressure welding device 10, in which case the first upper holding body 111 is, for example, the back side holding body, and the first lower holding body 112 is, for example, the front side. It becomes a holding body on the side. Further, the first upper holding body 111 may be a holding body on the left side, for example, and the first lower holding body 112 may be a holding body on the right side, for example.

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 plate thickness direction of the flat conductor; the same). It is movable so as to abut or separate from each other 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 portion 12 is arranged with the first holding portion 11 so as to have the facing surface OS2 along the second direction (hereinafter referred to as the Y direction) so as to face the first holding portion 11. It has the same configuration as the first holding unit 11. Therefore, although detailed description is omitted, the second holding portion 12 is movable along the X direction, and is composed of the second upper holding body 121 and the second lower holding body 122. The description of "upper and lower" of the second upper holding body 121 and the second lower holding body 122 is the same as that of the first holding portion 11.

The second upper holding body 121 and the second lower holding body 122 can move along the X direction, and the facing surfaces OS1 can move so as to abut or separate from each other along the Y direction.

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

The movement of the first flat conductor C1 and the second flat conductor C2 is restricted in the Y direction by a movement regulating means (not shown). Further, the first flat conductor C1 and the second flat conductor C2 can move in the direction in which they are close to each other along the X direction, but the movement in the direction in which they are separated from each other is restricted.

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

2 and 3 are front views extracted from the first holding portion 11 and the second holding portion 12, and are views showing the state of movement of these.

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

In the state shown in FIG. 3A, 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 most in the Y direction. It is a position to separate. This position is hereinafter referred to as a Y-direction separation position. Further, this state is a position where the facing surfaces OS2 of the first holding portion 11 and the second holding portion 12 are most separated from each other in the X direction. This position is hereinafter referred to as an X direction separated position.

FIG. 3B is a state in which the state shown in FIG. 6A has been moved to a position where the facing surfaces OS1 of the first upper holding body 111 and the first lower holding body 112 come into contact with each other. In this state, the first holding portion 11 sandwiches the first flat conductor (wide surface WS) between 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 second flat conductor (wide surface WS).

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

In the following description, the position where the facing surfaces 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) come into contact with each other is referred to as a holding position. 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) can move between the holding position and the Y-direction separation position.

Further, as shown in FIG. 6C, a release position (in the Y direction) of the pinch is included between the pinch position and the separation position in the Y direction. The release position in the Y direction (hereinafter, the release position in the Y direction) is a distance smaller than the separation position in the Y direction, and 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 121). It is a position separated from the body 122).

The position where the facing surfaces 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) come into contact with each other from the Y-direction release position in FIG. It is also possible to move to and transition to the state shown in FIG.

In FIG. 2, the positions of the first holding portion 11 and the second holding portion 12 along the X direction are both maintained in the X direction separated positions.

FIG. 3 is a diagram illustrating the movement of the first holding portion 11 and the second holding portion 12 mainly along the X direction.
FIG. 3A is a position where the first holding portion 11 and the second holding portion 12 have moved along the X direction so that the facing surfaces OS2 are closest to each other from the state of FIG. 2B. Hereinafter, this position is referred to as a proximity position. That is, the first holding portion 11 and the second holding portion 12 can move between the X-direction separation position shown in FIG. 2 and the proximity position shown in FIG. 3A. The first holding portion 11 and the second holding portion 12 do not come into contact with each other even at close positions.

The first holding portion 11 projects and sandwiches the first flat conductor C1 with the protrusion amount A, and the second holding portion 12 projects and sandwiches the second flat conductor C2 with the protrusion amount A2 ( FIG. 2B), when the first holding portion 11 and the second holding portion 12 are in close proximity to each other, the first holding portion 11 and the second holding portion 12 do not abut, but the first flat conductor C1 and the second holding portion 12 do not come into contact with each other. The flat conductors C2 are in contact with each other (joined) and are further pressed against each other. That is, the amount of protrusion A1 of the first flat conductor C1 from the first holding portion 11 and the amount of protrusion A2 of the second flat conductor C2 from the second holding portion 12 are the first holding portion 11 and the second holding portion 12, respectively. When they are in close proximity to each other, the amount is slightly longer than the length of contact with each other (the amount that can be pressed against each other after contacting each other).

Further, as shown in FIG. 2B, a pressing release position (in the X direction) is included between the proximity position and the X-direction separation position (FIG. 2A). The release position in the X direction (hereinafter referred to as the release position in the X direction) is a position where the first holding portion 11 and the second holding portion 12 are separated from each other at a distance smaller than the separation position in the X direction. When the first holding portion 11 and the second holding portion 12 are in the X-direction release position, the first upper holding body 111 and the first lower holding body 112 also move apart from each other and move to the Y-direction releasing position, and the second upper holding body 112 The 121 and the second lower holding body 122 are also separated and moved to the release position in the Y direction.

It is also possible to transition from the X-direction release position in FIG. 3B to the state shown in FIG.

FIG. 4 is a side view (arrow view in the V direction of FIG. 1) of the first holding portion 11 as viewed from the side of the second holding portion 12 as opposed to the surface OS2 of the first holding portion 11. FIG. 2A shows a state in which the first upper holding body 111 and the first lower holding body 112 are separated in the Y direction (state in FIG. 2A), and FIG. 2B shows a holding position. The state in (FIG. 2 (b)) is shown.

The flat conductor holding groove 111A is located in the first upper holding body 111 at a position close to one end surface (right end surface in the figure) 111S in the third direction (the short side direction of the flat conductor; the Z direction in the figure). The first lower holding body 112 is provided with a flat conductor holding groove 112A at a position close to one end surface (right end surface in the drawing) 112S in the third direction (hereinafter referred to as the Z direction). The third direction (Z direction) is a direction different from the X direction and the Y direction, respectively, and here, it is a direction orthogonal to both directions.

It is assumed that one end face 111S of the first upper holding body 111 and one end face 112S of the first lower holding body 112 are located on the same plane, and the one end face in the third direction (Z direction) is shown in FIG. Reference numeral 1 refers to the front surface of the first upper holding body 111 and the first lower holding body 112, and refers to an end face close to the operator.

The flat conductor holding grooves 111A and 112A are held inside the first upper holding body 111 and the first lower holding body 112 at a distance d1 in the third direction (Z direction) from the end faces 111S and 112S, and are held on the first upper side. 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 flat conductor holding grooves 111A and 112A need to securely hold (hold) the flat conductor. Therefore, the shape follows the outer shape of the flat conductor, and the groove depth d3 is less than half the thickness d2 of the sandwiched flat conductor (here, the first flat conductor C1). .. Specifically, the depths of the flat conductor holding grooves 111A and 112A are about 5/100 mm smaller than 1/2 of the thickness d2 of the flat conductor.

As shown in FIG. 2B, when the facing surfaces OS1 of the first upper holding body 111 and the first lower holding body 112 are in contact with each other (when they are in the holding position (FIG. 2B)), they are flat conductors. The holding grooves 111A and 112A form one columnar hole that penetrates the first holding portion 11 in the X direction, and a flat conductor (first flat conductor C1) is compressed in the hole in the plate thickness d2 direction. In a state (a state in which the plate thickness is reduced), the conductors are brought into close contact with the flat conductor holding grooves 111A and 112A, and are sandwiched between the first holding portions 11 (the first upper holding body 111 and the first lower holding body 112).

Although not shown here, the same applies to the second holding portion 12, and the second upper holding body 121 has one end face (front surface close to the operator) in the third direction (Z direction). The flat conductor holding groove 121A is provided at a position close to the flat conductor holding groove 121A, and the flat conductor holding groove 122A is provided at a position close to one end face of the second lower holding body 122 in the third direction. The configurations of the flat conductor holding grooves 121A and 122A are the same as the configurations of the flat conductor holding grooves 111A and 112A of the first holding portion 11.

The first holding portion 11 and the second holding portion 12 are in one of a holding state, a pressure contact state and a pressure contact release state, a shunting state, and a transition state between two of these states.

Explaining again with reference to FIGS. 2 and 3, in the pinched 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 (FIG. 2 (FIG. 2). Moving from a)) to the sandwiching position (FIG. 2B), the first flat conductor C1 is sandwiched between the first upper holding body 111 and the first lower holding body 112, and the second holding portion 12 is second. The upper holding body 121 and the second lower holding body 122 are moved from the Y-direction separated position (FIG. 2 (a)) to the holding position (FIG. 2 (b)) along the Y direction, and the second upper holding body 121 and the second lower holding body 122 are moved. The second flat conductor C2 is sandwiched between the second lower holding body 122.

As described above, the first holding portion 11 projects and sandwiches the first flat conductor C1 from the facing surface OS2 along the Y direction in the direction of the second holding portion 12 with a protrusion amount A1, and the second holding portion 12 holds the second holding portion 12. The second flat conductor C2 is projected from the facing surface OS2 along the Y direction in the direction of the first holding portion 11 with a protrusion amount A2 and sandwiched.

At this time, the pressing portion 18 (see FIG. 1A) presses the first upper holding body 111 and the first lower holding body 112 so as to come into contact with each other, and the second upper holding body 121 and the second lower holding body 121 are held. Press them so that they come into contact with the body 122. As a result, the first flat conductor C1 and the second flat conductor C2 are in close contact with the flat conductor holding grooves 111A, 112A, 121A, 122A in a state of being compressed in the plate thickness direction (a state in which the plate thickness is reduced), and the first It is sandwiched between the holding portion 11 and the second holding portion 12 (see FIG. 4).

Further, in the sandwiched 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. 2 (c)) are placed in the sandwiched position (FIG. 2 (b)). By moving, the first flat conductor C1 is sandwiched between the first upper holding body 111 and the first lower holding body 112, and the second upper portion 12 of the second holding portion 12 at the Y direction release position (FIG. 2C) is held. In the case where the holding body 121 and the second lower holding body 122 are moved to the holding position (FIG. 2B), the second flat conductor C2 is held between the second upper holding body 121 and the second lower holding body 122. is there.

At this time as well, the pressing portion 18 presses the first upper holding body 111 and the first lower holding body 112 so as to come into contact with each other so that the second upper holding body 121 and the second lower holding body 122 come into contact with each other. Press these on. As a result, the first flat conductor C1 and the second flat conductor C2 are compressed in the plate thickness direction (the plate thickness is reduced) in the hole portion, and the flat conductor holding grooves 111A, 112A, 121A, 122A are formed. They are in close contact with each other and are sandwiched between the first holding portion 11 and the second holding portion 12 (FIG. 4).

In the pressure contact state, the first holding portion 11 and the second holding portion 12 in the sandwiched state are separated from each other in the X direction along the X direction against the urging force of the urging member 15 (FIG. 2A). Move to a close position (FIG. 3 (a)). At this time, the first flat conductor C1 protrudes from the first holding portion 11, and the second flat conductor C2 protrudes from the second holding portion 12. These protrusion amounts A1 and A2 are based on the length at which the opposite end faces in the longitudinal direction of the band abut each other when the first holding portion 11 and the second holding portion 12 are in close positions (FIG. 3A), respectively. It is a slightly longer amount. That is, before (immediately before) moving to the close position, the opposing end faces of the first flat conductor C1 and the second flat conductor C2 first come into contact (contact) with each other. After that, the first holding portion 11 and the second holding portion 12 move to a close position (FIG. 3A), so that the end faces of the first flat conductor C1 and the second flat conductor C2 in contact with each other pierce each other. They are combined, pressed and joined. More specifically, by pressing the end faces of the first flat conductor C1 and the second flat conductor C2 against each other, the stable oxide film formed on the end faces is removed, and these are plastically deformed to be in an active state. Expose the surface. By bringing the active surfaces closer to 10 angstroms or less, atomic bonds between the metals are caused, and cold pressure welding is performed. That is, due to cold pressure welding, the lengths of the first flat conductor C1 and the second flat conductor C2 in the longitudinal direction of the band are compressed (shortened) after pressure welding as compared with those before pressure welding. The amount of shortening is the same for the first flat conductor C1 and the second flat conductor C2. That is, when the length of the first flat conductor C1 before pressure welding is L01 and the length of the second flat conductor C2 before pressure welding is L02, the length of the first flat conductor C1 is L01'and the second by pressure welding. The length of the flat conductor C2 is shortened to L02', and the shortened amount S is the same (S = L01-L01'= L02-L02').

Since the first holding portion 11 and the second holding portion 12 do not come closer to each other after moving to the close position, the end faces of the first flat conductor C1 and the second flat conductor C2 are more than each other. Pressing stops.

Further, in the pressure contact state, the first upper holding body 111 and the first lower holding body 112 at the Y direction release position (FIG. 2 (c)), or the Y direction release position and the X direction release position (FIG. 3 (b)). Further, 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 resist the urging force of the urging member 15. Then, the end face of the first flat conductor C1 and the end face of the second flat conductor C2 are abutted against each other and pressed to perform cold pressure welding (FIG. 3A).

In the pressure contact release state, the first holding portion 11 and the second holding portion 12 in the pressure contact state are moved in directions separated from each other along the X direction, and the first holding portion 11 and the second holding portion 12 are released in the X direction. Move to. Further, the first upper holding body 111 and the first lower holding body 112 are moved in a direction away from each other along the Y direction, and the first upper holding body 111 and the first lower holding body 112 are moved to the first Y direction release position. To do. Further, the second upper holding body 121 and the second lower holding body 122 are moved in the direction of being separated from each other along the Y direction, and the second upper holding body 121 and the second lower holding body 122 are moved to the second Y direction release position. (Fig. 3 (b)).

In the pressure contact state, the first holding portion 11 and the second holding portion 12 finally reach close positions, and further pressing of the first flat conductor C1 and the second flat conductor C2 is stopped, so that the pressing is repeated. After the pressure contact state, the state transitions to the sandwiched state via the pressure contact release state, and the first flat conductor C1 and the second flat conductor C2 are re-pinched by the first holding portion 11 and the second holding portion 12.

Here, when the pressure welding state is changed to the pressure welding release state (when the pressure welding is released), the urging member 15 causes the first upper holding body 111 and the first lower holding body 112 (second upper holding body 121 and second). The same applies to the lower holding body 122), and the urging force acts in the direction away from the lower holding body 122. 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 pressing. A part of the metal (expanded joint surface) that has flowed due to the deformation enters the slight clearances (for example, the corners of the grooves) of the flat conductor holding grooves 111A, 112A, 121A, and 122A to improve the adhesion, and the urging member 15 It may not be possible to separate 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) only by the urging force of.

Therefore, in the present embodiment, in the pressure contact release state (FIG. 3B), in addition to the urging force of the urging member 15, the first holding portion (first upper holding body 111 and first lower holding body 112) is provided. Along the X direction, the second holding portion 12 is moved away from the second holding portion 12 to return to the first X direction release position, and the second holding portion (second upper holding body 121 and second lower holding body 122) is moved in the X direction. It was decided to move it in a direction away from the first holding portion 11 along the same direction and return it to the second X direction release position.

Even when the first holding portion 11 and the second holding portion 12 are forcibly moved in the direction of being separated from each other in addition to the urging member 15, the first flat conductor C1 and the first flat conductor C1 are moved by a movement regulating means (not shown). The second flat conductor C2 is restricted from moving in a 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 contact release state, or the holding state are moved to the X direction separated positions along the X direction, and the first upper holding body 111 and the first holding body 111 and the second holding portion 12 are moved. 1 The lower holding body 112 is moved along the Y direction to move to the Y-direction separation position, and the second upper holding body 121 and the second lower holding body 122 are moved along the Y direction to the Y-direction separation position. Move (Fig. 2 (a)).

The cold pressure welding device 10 can perform cold pressure welding between flat conductors by pressing once, but it is desirable to repeat pressing a plurality of times for one joint portion in order to stabilize the joint surface. As an example, the pressing amount (compression amount) of the cold pressure welding device 10 at one time is about 0.5 mm for both the first flat conductor C1 and the second flat conductor C2. Then, when one joint portion is repeatedly pressed (cold pressure welding) 3 to 4 times and compressed by about 1 mm or more (preferably 1.5 mm or more, specifically about 2 mm), stable bonding is performed. A face is obtained.

Therefore, the cold pressure welding device 10 of the present embodiment repeats the holding state, the pressure welding state, and the pressure welding release state, and cold pressure-contacts the first flat conductor C1 and the second flat conductor C2.

As shown in FIG. 3A, when the first holding portion 11 and the second holding portion 12 move to close positions in a pressure contact state after the pinching state, the end faces of the first flat conductor C1 and the second flat conductor C2 are brought into contact with each other. Through contact (contact), the end faces are pressed against each other and cold-pressed. Since the first holding portion 11 and the second holding portion 12 which are in close positions do not come close to each other any more, the first holding portion 11 and the second holding portion 11 and the second holding portion 11 and the second holding portion 11 and the second holding portion 12 are temporarily transitioned to the pressure contact release state (FIG. The holding portion 12 is moved to the release position in the Y direction to release the holding of the flat conductor, and the first holding portion 11 and the second holding portion are moved to the release position in the X direction. Then, the first flat conductor C1 is held in the first holding portion 11 so that the predetermined protruding amount A1 protrudes in the pinched state, and the second holding portion 12 is held so that the protruding amount A2 protrudes. By holding the 1 flat conductor C2 and transitioning to the pressure welding state again, it is possible to repeat a plurality of pressings on one joint portion.

That is, the X-direction release position is a position where the first holding portion 11 can project the first flat conductor C1 with the protruding amount A1 and sandwich it, and the second holding portion 12 projects the second flat conductor C2. It is a position where it can be projected and sandwiched by the amount A2.

It should be noted that the X-direction release position does not have to be the position where each of the flat conductors protrudes with the protrusion amounts A1 and A2 when the state transitions to the holding state (as it is). In that case, in the sandwiched state, the first holding portion 11 and the second holding portion 12 may be moved to positions where the flat conductors project with the protruding amounts A1 and A2, and then sandwiched.

Further, in the above embodiment, the configuration in which the first holding portion 11 and the second holding portion 12 are stopped at the X-direction release position and the Y-direction release position in the pressure contact release state has been described as an example, but the X-direction release position and the X-direction release position and the configuration have been described. Although it passes through the Y-direction release position, it may not stop at the position. That is, 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) do not have a gap between the holding position, the Y direction release position, and the Y direction separation position. The first holding portion 11 and the second holding portion 12 may move by stopping, and may move non-stop between the proximity position, the X-direction release position, and the X-direction separation position. ..

Conventionally, cold pressure welding has been used when joining round wires to each other, but according to the cold pressure welding device 10 of the present embodiment described above, good and stable cold pressure welding between flat conductors is performed. Can be done.

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

<Coil manufacturing equipment>
<Coil manufacturing equipment / 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 flat conductor C. The flat conductor C is a plurality of strip-shaped flat conductors that are linear (FIG. (A)) or have at least one bent portion (FIGS. (b) to (e)) and can form a spiral shape when continuous. Hereinafter, these are referred to as coil pieces. It is assumed that the coil pieces having the bent portions are bent in the same direction in the longitudinal direction of the band so as to have a spiral shape when they are made continuous. Further, in the case of a coil piece having a bent portion, it is preferable that the bent portion has at least one non-curved (for example, substantially right angle) shape.

Further, in the following description, the coil piece includes a spiral structure in which a plurality of coil pieces (flat conductors) are continuously (connected) and is not completed as a coil (spiral structure to be completed). It shall be. That is, in the following description, the coil piece (flat conductor) includes a coil piece of the smallest unit having a linear or bent portion in the same direction in the longitudinal direction of the band of 1 to 4, and a plurality of coil pieces of the smallest unit. It includes a coil piece that is connected to form a spiral structure having one or more turns of a coil (spiral structure to be completed). For convenience of explanation, when it is necessary to distinguish between them, the smallest unit coil piece is called a unit coil piece, and a plurality of unit coil pieces are connected and completed as a coil (spiral structure to be completed). The coil piece before the schedule is called a junction coil piece, and the spiral structure to be completed (completed state) is called a coil. Further, it is assumed that the shapes and areas of the cross sections of the plurality of coil pieces perpendicular to the longitudinal direction of the band are substantially the same.

As shown in the figure, the unit coil piece C0 is formed into a shape having a linear or substantially right-angled non-curved bent portion (corner portion) by punching a copper plate (for example, a thickness of 1 mm) as an example. To. That is, the unit coil piece C0 has a linear shape (I-shape) without a bent portion (Fig. (A)) and an L-shape having one bent portion (Fig. (B)) when viewed from above the wide surface WS. U-shaped (U-shaped) with two bent parts (Fig. (C)), substantially C-shaped with three bent parts (figure (d)), and the same with four bent parts C-shaped (substantially O-shaped (substantially R-shaped)) that bends in the direction (there is one in the figure (e). In the following description, U-shaped, (omitted) C-shaped, approximately O-shaped Although the shape is used, it is assumed that the bent portion (corner portion) has a substantially right-angled shape.

The plurality of coil pieces (unit coil pieces and / or junction coil pieces) have a preparation length L0 which is the total distance in the band longitudinal direction thereof, and the spiral structure (coil) to be completed is completed in the spiral longitudinal direction. It is set to be longer than the length by a margin. The margin is set to a shortened total distance that is shortened by pressing when all of the plurality of coil pieces are cold-pressed. The prepared length L0, the completed length, the margin, and the total shortened distance will be described in detail in the description of the coil manufacturing method described later.

<Coil manufacturing equipment / holding unit>
Since the coil manufacturing apparatus 20 of the present embodiment is an example of using the cold pressure welding apparatus 10 described above, the same configuration as that of the cold pressure welding apparatus 10 is indicated by the same reference numerals and duplicated description is omitted. , The configuration suitable for use in the coil manufacturing apparatus 20 will be mainly described.

With reference to FIG. 1 again, the coil manufacturing apparatus 20 has a first holding portion 11 and a second holding portion 12 which are capable of sandwiching the flat conductor and the other flat conductor and are arranged so as to face each other. A spiral structure is formed by joining a plurality of strip-shaped flat conductors (coil pieces) that can form a spiral shape when they are continuously provided, and forms a spiral structure, which is the total length of the plurality of flat conductors (coil pieces) in the strip longitudinal direction. The prepared length, which is the distance, is set to be longer than the completed length in the spiral longitudinal direction of the spiral structure to be completed by a margin, and the end faces of a plurality of flat conductors (coil pieces) are banded with each other. Press along the longitudinal direction to perform cold pressure welding while shortening the distance in the band longitudinal direction, and set a margin for the total shortened distance that shortens all of the plurality of flat conductors (coil pieces) by cold pressure welding. It forms a spiral structure.

That is, in the coil manufacturing apparatus of the present embodiment, the length of the coil piece (joined coil piece) held by the first holding portion 11 or the second holding portion 12 becomes longer as the number of additions (the number of joinings) of the coil pieces increases. Therefore, the configurations of the first holding portion 11 and the second holding portion 12 are suitable for use in the manufacture of the coil.

First, FIG. 6 is a schematic view of a coil piece being manufactured by the coil manufacturing apparatus 20. FIG. (A) is a schematic view (top view) of the prepared unit coil pieces, and FIGS. (B) to (d) are development views of the unit coil pieces and the junction coil pieces in the process of being manufactured. FIG. (E) is an arrow view in the V direction of FIG. 6 (d).

Here, as an example, a plurality of U-shaped (U-shaped) unit coil pieces C0 having two bent portions (4 in this case) are prepared, and these are connected (continuously) into a spiral shape having two circumferences. An example is shown in which a coil (spiral structure) 50 made of the above is manufactured. The alternate long and short dash lines at both ends of the coil pieces in FIGS. (B) to (d) indicate the finished end of the finished coil. In this example, the finished end does not change (finished in the left-right direction shown in the figure). The position of the end does not move).

First, in the first cold pressure welding, as shown in FIG. 6B, one end faces (indicated by circles) of the two unit coil pieces C01 and C02 are connected to each other to form a junction coil piece CC1. Then, in the next cold pressure welding, one end surface of the junction coil piece CC1 (one of the unbonded end faces of the unit coil pieces C01 and C02) and the unit coil piece C03 are cold pressure welded to form the junction coil piece. CC2 is formed (Fig. 3C), and in the next cold pressure welding, one end face of the bonded coil piece CC2 (one of the unjoined end faces of the unit coil pieces C01 and C03) and the unit coil piece. Cold pressure contact with C04 completes the coil 50 (FIG. (D)).

That is, the first holding portion 11 or the second holding portion 12 holds the bent (here, U-shaped (U-shaped)) coil piece, and the joint coil pieces CC1, CC2, etc. having a spiral structure that gradually become longer. Since is present in the vicinity of the first holding portion 11 or the second holding portion 12, the first holding portion 11 and the second holding portion 12 need to be configured to avoid interference with these coil pieces.

FIG. 7 is a diagram for explaining the configuration of the first holding portion 11, and FIG. 7A shows one unit coil piece C0 in the first holding portion 11 (first upper holding body 111 and first lower holding body 111). It is a figure which shows the state which holds by 112), and is the figure which front-viewed the facing surface OS2 with the 2nd holding part 12. Further, FIG. 3B is a front view of the completed coil 50 as viewed from the axial center direction of the spiral structure, and the coil piece in FIG. Corresponds to the figure. Although the first holding unit 11 will be described here, the same applies to the second holding unit 12. Further, FIG. 3C is a front view of the first holding portion 11 (a cross-sectional view taken along the line AA of FIG. 11A).

As shown in FIGS. (A) and (b), when the coil piece has two or more bent portions (for example, in the case of a U-shaped (U-shaped) coil piece), it is joined to the first holding portion 11. In the region other than the coil piece ((a) in the figure), the coil piece C0'held by the first holding portion 11 may interfere with the coil piece C0'that makes a U-turn and extends toward the front side. In the present embodiment, in order to avoid this, the dimensions of the first holding portion 11 and the coil piece (coil 50 to be completed) are configured to satisfy the following relationship.

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

Therefore, in order to avoid interference between the first holding portion 11 and the coil piece, it is necessary to provide the flat conductor holding grooves 111A and 112A of the first holding portion 11 at appropriate positions, which are closest to the spiral inner end surface IS. The distance d1 to the ends (upper end in the figure) of the flat conductor holding grooves 111A and 112A is a spiral along a third direction (Z direction in the figure: the short side direction of the coil piece for cold pressure welding). It is assumed that the distance D1 in the internal space of the structure (coil 50) is smaller than that of the distance D1.

Further, the length d4 of the first holding portion 11 in the X direction (FIG. (C)) is smaller than the distance D2 (FIG. (B)) of the internal space of the spiral structure (coil 50) along the X direction. It shall be.

After the two coil pieces are cold-pressed, burrs 55 are formed at the connection portion by extrusion. Therefore, after the cold pressure welding is completed, the coil piece (joint coil piece) is taken out from the first holding part 11 and the second holding part 12 to deburr the coil piece (joint coil piece) and another (new). Cold pressure welding is performed with the coil piece.

FIG. 8 is a view corresponding to FIG. 7A (viewed from the same direction), and shows a state in which the junction coil piece CC is formed. In the coil manufacturing apparatus 20 of the present embodiment, the junction coil piece CC is formed on one side of the first holding portion 11 (the same applies to the second holding portion 12), here on the first lower holding body 112 side. On the other hand, since the flat conductor holding grooves 111A and 112A of the first holding portion 11 are linear grooves along the X direction, only a part of the straight line including one end surface of the junction coil piece CC is formed during cold pressure welding. Is held by the first holding unit 11. Therefore, in order to avoid interference between the junction coil piece CC and the first holding portion 11 (first lower holding body 112), the coil piece (here, the junction coil piece CC) is spiraled, leaving the vicinity of the end face to be cold-pressed. Cold pressure welding is performed with the coil piece held by the second holding portion 12 while elastically deforming and / or plastically deforming so as to expand in the spiral traveling direction (direction along the Y direction) of the structure.

The deformation amount D3 of the elastic deformation and / or the plastic deformation in the spiral traveling direction of the coil piece (here, the joint 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 of the holding body (here, the first lower holding body 112) on the side where the joining coil piece of the first holding portion 11 is formed is the coil piece (here, joining). The amount of deformation D3 allowed for elastic deformation and / or plastic deformation in the spiral traveling direction of the coil piece CC) shall be smaller.

As described above, the coil manufacturing apparatus 20 of the present embodiment forms a spiral structure by connecting the coil pieces by cold pressure welding while elastically deforming and / or plastically deforming the coil pieces in the spiral traveling direction (direction along the Y direction). is there. As a result, in the middle of manufacturing, the coil pieces are connected (added) in a state of spreading in the traveling direction of the spiral, but after the spiral structure is completed, the spiral structure is integrally molded (for example). , Press, etc.) and perform elastic deformation and / or plastic deformation to compress in the traveling direction of the spiral to form a coil 50 in which each circumference of the spiral is in close contact.

The coil manufacturing apparatus 20 of the present embodiment uses a coil piece that is longer by the amount of compression (shrinkage) by cold compression (longer by the margin) based on the length of the coil after completion, and is compressed by cold compression (compression by cold compression). A coil having a desired length L is manufactured by adding coil pieces while repeating contraction).

Therefore, in the cold pressure welding, the cold pressure welding is performed while measuring the distance of the coil pieces in the longitudinal direction of the band. For measuring the distance in the longitudinal direction of the band, for example, a coil piece held by the first holding portion 11 by providing a slip detecting mechanism (not shown) in the first holding portion 11 and the second holding portion 12 (or its vicinity). By detecting the slip of the coil piece (second coil piece) held by the (first coil piece) and the second holding portion 12 at the time of pressing, the distance in the longitudinal direction of the band can be measured. The distance in the longitudinal direction of the band may be measured at the same time as the cold pressure welding (in real time), or before and after the cold pressure welding (or before or after the cold pressure welding). As a result, it is possible to realize high accuracy of the coil size after completion.

As shown in FIG. 7B, the bent portion of the coil piece at a substantially right angle is the corner portion of the coil 50. That is, according to the coil manufacturing apparatus 20 of the present embodiment, the corner portions on the inner peripheral side and the outer peripheral side are substantially right-angled by connecting the coil pieces configured to have a substantially right-angled bent portion by punching or the like. Coil 50 can be manufactured. In the past, a coil made of a flat conductor was manufactured by winding a long flat conductor, but it is inevitable that at least the corners on the inner peripheral side of the coil will be curved in winding, and the space factor. There was a limit to the improvement of the heat dissipation and the improvement of heat dissipation.

However, according to the coil manufacturing apparatus of the present embodiment, since the shapes formed by the punching process can be joined together, a right-angled (substantially right-angled) corner can be realized even on the inner peripheral side of the coil, and the space factor is improved. It is possible to manufacture a coil capable of improving heat dissipation by eliminating extra space.

In particular, the joint portion CP is provided in a straight portion while avoiding a bent portion (corner portion). That is, pressure welding is performed using the straight portion of the coil piece. As a result, the shape accuracy of the bent portion can be improved, and for example, the corner portion that remains formed at a right angle (substantially right angle) in the punching process can be maintained.

<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 carried out, for example, in the coil manufacturing apparatus 20 described above.

That is, in the coil manufacturing method of the present embodiment, a plurality of strip-shaped flat conductors (coil pieces) that can form a spiral structure when continuously prepared are prepared, and the total distance of the plurality of flat conductors (coil pieces) in the strip longitudinal direction is prepared. The length L0 is set to be longer by a margin M compared to the completed length L in the spiral longitudinal direction of the spiral structure (coil) to be completed, and the end faces of the plurality of flat conductors (coil pieces) are connected to each other. By pressing along the longitudinal direction of the band, cold pressure welding is performed while shortening the distance in the longitudinal direction of the band, and all of the plurality of flat conductors (coil pieces) are shortened by cold pressing. 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 these are connected (continuously). A case of manufacturing a coil (spiral structure) 50 having a spiral shape having two circumferences will be described as an example. Similar to FIG. 6, FIG. 6A is a top view of coil pieces C01 to C04, FIGS. The axial center (center of the joint CP) of the spiral structure of the coil 50 is shown. Further, the alternate long and short dash lines at both ends of the coil pieces in FIGS. (B) to (d) indicate the finished end of the completed coil. In this example, the finished end does not change (in the left-right direction in the drawing). The position of the finished end does not move).

Assuming that the lengths of the unit coil pieces C01 to C04 in the band longitudinal direction are L01 to L04, respectively, the prepared length L0, which is the total distance in the band longitudinal direction, is L01 + L02 + L03 + L04. The prepared length L0 is set to be longer (L0 = L + M) by a margin M than the completed length L in the spiral longitudinal direction of the coil 50. When the unit coil piece C01 and the unit coil piece C02 are pressed along the longitudinal direction of the band and cold-pressed, the length L01 of the unit coil piece C01 in the longitudinal direction of the band is compressed to L01'(shortened (shortened (shortened (shortened)). The amount of compression) is the length of the distance S1 from the center of the joint CP), and the length L02 of the unit coil piece C02 in the longitudinal direction of the band is compressed to L02'(the amount of shortening (compression) is the distance S2 from the center of the joint CP). The length is increased to form the junction coil piece CC1 (length LC1) (FIG. (B)), and the end face of the junction coil piece CC1 (the end face of the unit coil piece C01 or C02 on the unjoined side). When the unit coil piece C03 is cold-pressed, the unit coil piece C03 is compressed to L03'by these pressures (the amount of shortening (compression) is the length of the distance S3 from the center of the joint CP), and the joint coil piece CC1 is , LC1'is compressed ((the amount of shortening (compression) is the length of the distance S4 from the center of the junction CP) to form the junction coil piece CC2 (Fig. (C)). Further, the end face of the junction coil piece CC2. When (the end face of the unit coil pieces C01 and C03 on the unbonded side) and the unit coil piece C04 are cold-pressed, the unit coil piece C04 is compressed to L04'by these pressings (the shortened (compressed) amount is joined. The joint coil piece CC2 is compressed to LC2'((the shortened (compressed) amount is the length of the distance S6 from the center of the joint CP)), and the completed length in the spiral longitudinal direction (the length of the distance S6 from the center of the joint CP). A coil 50 (spiral structure) having a length (length from the start point ST to the end point SE) L is completed ((d) in the figure). The coil pieces (unit coil pieces and / or junction coil pieces) are spliced together to form the coil 50. The total amount of shortening of the coil pieces (total shortened distance S = S1 + S2 + S3 + S4 + S5 + S6) until completion corresponds to the margin M.

The method of manufacturing the coil of the present embodiment will be described again in chronological order. First, based on the length L of the completed coil 50, the lengths L01 to L04 of the unit coil pieces are set so that the total shortened distance S = the margin M, and the compression amount S1 by cold pressure welding is set. S6 is set.

Then, using the coil pieces set in this way, the end faces of the unit coil piece C01 and the unit coil piece C02 are pressed for the set compression amounts S1 and S2 and replenished by cold pressure welding to form the junction coil piece CC1. To do. The compression amounts S1 and S2 at this time are grasped by measuring the distance between the unit coil pieces C01 and the unit coil piece C02 in the longitudinal direction of the band by detecting slippage at the time of pressing. The method of grasping the amount of compression is the same in the following cold pressure welding.

After cold pressure welding of one joint region (for example, near the end face where the unit coil piece C01 and the unit coil piece C02 are joined), burrs are generated by pushing into the joint portion, so that the burr is removed after the cold pressure welding. I do.

Next, the coil piece (joint coil piece CC1) is cold-pressed, leaving the vicinity of the end face (the end face of the unit coil piece C01 or the unit coil piece C02 not joined), and the spiral traveling direction of the spiral structure to be completed. Cold pressure welding is performed with another coil piece (unit coil piece C03) while being elastically deformed and / or plastically deformed. At this time, the amount of elastic deformation and / or plastic deformation of the junction coil piece CC1 in the spiral traveling direction is the first holding portion 11 and the second holding portion 12 in which the coil piece is held during cold pressure welding, and the junction coil piece. The amount is set to avoid interference with CC1. The amount of deformation is the same in the following cold pressure welding.

Hereinafter, the coil pieces are added in the same manner. That is, the end face of the joining coil piece CC1 (the end face of the unit coil piece C01 or C02 on the unjoined side) and the unit coil piece C03 are pressed for the set compression amounts S3 and S4 to be added by cold pressure welding and joined. The coil piece CC2 is formed. After that, deburring of the joint region is performed, and the joint coil piece CC2 is elastically and / or plastically deformed in the spiral traveling direction of the spiral structure to be completed, leaving the vicinity of the end face to be cold-pressed. The end face of CC2 and the unit coil piece C04 are pressed for the set compression amounts S5 and S6 and replenished by cold pressure welding to obtain a completed spiral structure.

FIG. 10 is a diagram showing an example of the completed spiral structure 50'(the number of turns of the coil is different from that of the above-described embodiment). FIG. 10A is a front view seen from the spiral axis direction, FIG. 10B is an arrow view (side view) in the V direction before molding, and FIGS. 10C and 10D are after molding. It is a side view of.

The completed spiral structure 50'is formed by press working or the like. That is, during cold pressure welding, in order to avoid buffering with the first holding portion 11 and the second holding portion 12, elastic deformation and / or plastic deformation in the spiral traveling direction of the spiral structure is performed during each circumference of the spiral. Since an unnecessary and non-uniform spread (space) is formed in the spiral structure, it is elastically and / or plastically deformed in the spiral traveling direction of the spiral structure so as to compress it, and each circumference of the spiral is deformed as much as possible. Proximity (close) (Fig. (C)).

Further, if necessary, the spiral structure is formed to be concave or convex in the axial center direction (diameter direction of the stator core) according to the shape of the stator core, that is, as shown in FIG. It is formed into a curved shape in which the peripheral end portion is not flush with the outer peripheral end portion.

Then, the molded spiral structure is immersed in a liquid insulating resin and integrally coated with the insulating resin. The spiral structure after molding may be integrally coated with the insulating resin by spraying the liquid insulating resin. Conventionally, a long lead wire corresponding to the completed length of a coil is covered with an insulating resin and then wound to form a spiral structure. However, in this case, the insulating resin is stretched near the outer periphery of the curved portion of the winding to reduce the coating thickness, which causes deterioration of pressure resistance. Further, for example, when the insulating resin is coated before the above-mentioned molding, the same problem occurs because the coating thickness of the insulating resin varies depending on the press. In the present embodiment, since the spiral structure formed into a shape to be attached to the stator core is integrally coated with the insulating resin after molding, the uniformity of the film thickness of the insulating resin can be improved. Further, since the spiral structures are integrally coated with the insulating resin after molding, the spiral structures can be adhered to each other with the insulating resin, and can be coated with a uniform film thickness.

<Modification example of coil piece>
FIG. 11 is a diagram showing a connection example when the shapes of the coil pieces are different.

FIG. 3A is a top view showing a connection example using L-shaped coil pieces. Here, a case where four L-shaped coil pieces C0 are used to form a connection coil piece for one round is used. Shown. Although not shown for convenience of explanation, in this case as well, the prepared length L0, which is the total distance in the band longitudinal direction, is the completed length of the spiral structure (coil) to be completed in the spiral longitudinal direction. It is set to be longer by the margin M as compared with the L. The margin M is set to a shortened total distance S that is shortened by pressing when all of the plurality of coil pieces are cold-pressed.

It is not necessary that all the connecting coil pieces for one round have the same shape (L-shape). That is, an I-shaped (straight line) or U-shaped (U-shaped) coil piece may be combined in an L-shape to form a connection coil piece for one round.

FIG. 3B 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 not shown for convenience of explanation, in this case as well, the prepared length L0, which is the total distance in the band longitudinal direction, is the completed length of the spiral structure (coil) to be completed in the spiral longitudinal direction. It is set to be longer by the margin M as compared with the L. The margin M is set to a shortened total distance S that is shortened by pressing when all of the plurality of coil pieces are cold-pressed.

Further, a coil piece having a substantially C-shape having three corners and a coil piece having an L-shape may be combined to form a connection coil piece for one round. Further, the coil pieces forming the first and second laps of the spiral structure may have different combinations.

FIG. 3C shows a U-shaped (U-shaped) coil piece C0 with two corners and a coil piece (O-shaped (R-shaped) coil) for one round of the spiral structure to be completed. Piece) It is a development view in the case of forming a junction coil piece in combination with C1. The alternate long and short dash lines at both ends of the coil piece in the figure indicate the finished end of the finished coil. In this example, the finished end does not change (the position of the finished end does not move in the left-right direction shown in the figure). ) Explain 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-pressed, the U-shaped coil piece C0 has a compression amount of S0 and the O-shaped coil piece C1 has a compression amount of S1. It is compressed and can be repeated to form a spiral structure. In FIG. 9 (when U-shaped coil pieces C0 having the same length are used), as shown in the drawing, the joint portion CP is located at substantially the same position along the axial center of the spiral structure at each circumference of the spiral structure. Although it is formed at (overlapping position), in the case of FIG. 11C, the joint CP is formed at a position deviated by a predetermined amount along the axial center (broken line) of the spiral structure at each circumference of the spiral structure. Helix.

<Coil deformation example>
FIG. 12 is a diagram showing a modified example of the coil manufacturing apparatus and the coil manufacturing method. FIG. (A) is a schematic view of the coil manufacturing apparatus 20', and FIG. 3 (b) is a side view of the coil 50 manufactured by the coil manufacturing apparatus 20', which corresponds to FIG. 10 (c). c) is a perspective view of the coil 50.

As shown in FIG. 2A, the coil manufacturing apparatus 20'includes a plurality of holding units 22 including the first holding portion 11 and the second holding portion 12, and the plurality of holding units 22 (22A to 22E) are provided. The widths W (width along the Z direction, width of the flat conductor in the short side direction BS) of the flat conductor holding grooves 111A, 112A, 121A, and 122A of the first holding portion 11 and the second holding portion 12 are different (sequentially). It may be larger (or smaller).

In this way, by using a plurality of holding units 22 having different widths W of the flat conductor holding grooves 111A, 112A, 121A, 122A, flat conductors having different widths (widths WA to WE in the figure) can be joined. That is, while sequentially moving between the plurality of holding units 22, cold pressure contact is performed with different holding units 22 for each circumference of the spiral structure to form a spiral 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 band, the coil pieces are joined by cold pressure welding while sequentially moving between the plurality of holding units 22. Therefore, a coil 50 (FIGS. (B) and (c) in the same figure) having an outer shape of a quadrangular pyramid 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 made different.

<Coil>
Next, the coil of the present embodiment will be described with reference to FIG. FIG. 13A is a front view seen from the axial center direction of the spiral structure, and FIG. 13B is a cross section taken along line AA of FIG. 13A. Further, FIG. 6C is a side view of FIG. 6A as viewed from the V direction.

The coil 50 of the present embodiment is composed of a spiral structure in which strip-shaped flat 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 by using the coil manufacturing apparatus and the coil manufacturing method described above.

In the conventional coil constructed by winding a long flat conductor longer than one circumference of the spiral structure of the completed coil, it is inevitable that the bent part has a curved structure, and when it is attached to the stator core, it is inevitable. Creates a large space. Since the heat retaining effect of the blank portion is enhanced, there is a limit to improving the heat dissipation of the coil. Further, when a long flat conductor is coated with an insulating resin and then wound, there is a problem that the coating thickness of the insulating resin becomes thin at the bent portion and the pressure resistance deteriorates.

On the other hand, in the coil 50 of the present embodiment, since the shape of one circumference of the spiral structure of the coil can be formed by punching, a coil having a desired shape can be formed in the front view. That is, a coil 50 having a shape that is infinitely close to the shape of the stator core (at least the inner peripheral corner portion 50C is at a right angle or at a substantially right angle) can be obtained. As a result, unlike the winding type coil, the space between the stator core 60 (shown by the broken line in FIG. 6A) can be minimized. For example, the length of the space (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 heat dissipation can be improved. Further, since the insulating resin can be coated with high uniformity over the entire coil 50, deterioration of withstand voltage due to variation in the film thickness of the insulating resin can be suppressed.

Further, in the coil 50 of the present embodiment, the width orthogonal to the spiral traveling direction of the spiral structure (width W1 in the short side direction of the coil piece) becomes the spreading width W2 at the corners, so that the coil resistance is also reduced. can do.

Further, since the cold pressure welding is an atomic bond of a metal, the connecting portion is surely joined to the extent that it cannot be seen. As a result, the stability of the connecting portion can be overwhelmingly improved as compared with a configuration in which the coils for one round (or less) are connected in a plane with an adhesive (fixing material, brazing, etc.).

Further, as shown in FIG. 3B, the first circumference of the spiral of the spiral structure (for example, the first circumference by the junction coil piece CC1) is a part of the flat conductor (coil piece) of the other part. A first thin-walled portion T1 having a plate thickness D8 thinner than the plate thickness D7 is provided. Further, the second circumference continuous with the first circumference (for example, the second circumference due to the junction coil piece CC2) has a plate thickness D8 rather than the plate thickness D7 of the flat conductor (coil piece) in the other portion. A thin second thin-walled portion T2 is provided.

As described above, the coil pieces are sandwiched by the first holding portion 11 and the second holding portion 12 of the coil manufacturing apparatus 20 during cold pressure welding. At that time, the total depth of the flat conductor holding grooves 111A and 112A ( The total depth of the flat conductor holding grooves 121A and 122A is also the same), which is smaller than the plate thickness D7 of the coil piece. Then, the coil pieces are pressed by the pressing portion 18 and sandwiched between the first holding portion 11 and the second holding portion 12, so that the sandwiched portions are formed of the flat conductor holding grooves 121A and 122A and the flat conductor holding grooves 111A and 112A. It is compressed in the plate thickness direction to a thickness (D8) equivalent to the total depth. The sandwiched portions by the first holding portion 11 and the second holding portion 12 are the first thin-walled portion T1 and the second thin-walled portion T2. That is, the first thin-walled portion T1 and the second thin-walled portion T2 are formed corresponding to the joint portion CP of the cold pressure welding, and for example, a U-shaped (U-shaped) coil piece is connected. In the case of the coil, the first thin-walled portion T1 is provided at two locations on the first circumference, and the second thin-walled portion T2 is also provided at two locations on the second circumference. When the lengths of the U-shaped unit coil pieces are all the same, the positions where the first thin-walled portion T1 and the second thin-walled portion T2 overlap in the axial center direction of the spiral structure as shown by the broken line squares. It is provided in.

Further, in the first thin-walled portion T1 and the second thin-walled portion T2 formed corresponding to the joint portion CP of the cold pressure welding, the coil pieces are U-shaped (U-shaped) and O-shaped as shown in FIG. When it is composed of a (square) combination, it is formed at positions that are alternately offset on the first circumference and the second circumference corresponding to the joint CP (in the case of an O-shaped coil piece). A thin part is formed only at one place in one lap).

The coil 50 is integrally covered with an insulating resin on all the circumferences constituting the spiral structure. As a result, the adhesion of each circumference of the spiral structure can be improved. Further, a gap portion SP of the coil piece is formed between the first thin-walled portion T1 and the second thin-walled portion T2, and a part of the insulating resin is also embedded in the gap portion SP. That is, as described in the above-mentioned manufacturing method, after the spiral structure is completed (molded if necessary), the spiral structure is immersed in the liquid insulating resin, so that the insulating resin enters the gap SP. As a result, the adhesion of each circumference of the spiral structure can be further improved.

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

FIG. 14 is a diagram in which the calorific value of the coil 50 of the present embodiment and the coil (round wire coil) formed by winding a round wire are measured and compared. For the round wire coil and the coil 50 of the present embodiment, the calorific value (temperature) with the passage of time was measured at 5 V and 20 A.

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

As is clear from this result, the coil 50 of the present embodiment (coil having a substantially right angle on the inner circumference side (inner circumference right angle coil)) 50 has a temperature close to room temperature (for example, 40 ° C. to 50 ° C.) or higher even during operation. It can be said that there is almost no temperature rise in the coil, and it can be said that the heat dissipation is very high. And, due to such high heat dissipation, the coil resistance can be significantly reduced as compared with the conventional case.

Further, the width W3 of the start end portion and the end portion of the spiral structure of the coil 50 may be wider than the width W1 in the short side direction. As a result, the coil resistance at the start end portion and the end portion can be reduced as in the case of the corner portion.

In this embodiment, the coil 50 having a right angle to the inner circumference, which is formed by repeatedly joining the end faces of the coil pieces by cold pressure welding, has been described. However, the present invention is not limited to this, and the end faces of the coil pieces may be joined by another joining method. Specifically, various connection methods such as ultrasonic welding (high frequency welding), electric welding, and brazing can be adopted.

<How to attach to the stator core>
An example of attaching the coil 50 of the present embodiment to the stator core will be described with reference to FIG. FIG. 15A is a side view of the coil 50 and the cassettes 51A and 51B. Further, FIG. 15 (b) is a cross-sectional view taken along the line cc of FIG. 15 (a). FIG. 15 (c) is a cross-sectional view corresponding to a cross section along the line cc of FIG. 15 (a) showing an example of attachment to the stator core 60.

The coil 50 of the present embodiment is molded along the outer shape of the stator core as shown in FIG. 13C, and is integrally coated with an insulating resin after molding, and this is mounted on the stator core by so-called retrofitting.

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 spiral structure of the coil 50 are prepared, and one cassette 51A The coil 50 is inserted from the surface side on which the flange portion 52A is not formed, and the other cassette 51B is overlapped and engaged with each other. Then, the coil 50 with a cassette is inserted into the stator core 60. The cassettes 51A and 51B are provided with a notch or an engaging portion 53 so as to fit in the top view of the cross section shown in FIG.

As shown in FIG. 6C, the coil 50 may be attached to one cassette 51C having a flange portion 52B only on one surface side in the axial center direction of the spiral structure, and may be attached to the stator core 60. In that case, in order to prevent the coil 50 from coming off from the stator core 60 (or unnecessary movement (vibration)) due to centrifugal force during operation, a notch 61 is provided in the stator core 60, and the coil 50 with a cassette is used as the stator core. After being attached to the 60, it is preferable to fit the retaining ring 62 that covers the upper part of the coil 50 with the cassette and the notch 61 of the stator core 60.

<Coil spiral structure>
The spiral structure of the coil will be further described with reference to FIGS. 16 and 17. 16A and 16B are side views of the coil 50 of the present embodiment, FIG. 16A is a side view seen from the short side side of one embodiment, and FIG. 16B is a side view seen from the long side side thereof. It is a side view, FIG. 3C is a side view seen from the short side side of another embodiment, and FIG. 3D is a side view seen from the long side side thereof, and FIG. Is a side view seen from the short side of yet another embodiment. 17 is a modification of FIGS. 16 (c) and 16 (e). FIGS. 17 (a) and 17 (c) are external perspective views, and FIGS. 17 (b) and 17 (d) are the same. It is a side view of the arrow (a) and (c).

For example, when a plurality of U-shaped (U-shaped) unit coil pieces shown in FIG. 6 are connected to form a spiral structure, as shown in FIGS. 16A and 16B, the first spiral is formed. During one round from the circumference TC1 to the second circumference TC2, the coil piece is gradually deformed along the spiral traveling direction to absorb the thickness of the unit coil piece, and this is repeated for each circumference.

That is, strictly speaking, the coil 50 according to the embodiment of the present embodiment is connected to the next coil piece while each coil piece is slightly inclined as shown in FIGS. (A) and (b). A spiral structure is formed. Although one side surface of the coil 50 on the short side (FIG. (A)) and one side surface on the long side (FIG. (B)) of the coil 50 are shown here, the same applies to all four sides of the coil 50. Tilt.

Further, the coil 50 of the present embodiment is not limited to the above structure, and may have a spiral structure as shown in FIGS. (C) to (e).

That is, as shown in FIG. 6C, a part of the first circumferential TC1 of the spiral of the spiral structure is deformed so that a step B corresponding to the thickness of the coil piece is formed along the spiral traveling direction. , A part of the second peripheral TC2 of the spiral is deformed so as to form a step B corresponding to the thickness of the coil piece along the spiral traveling direction, and this is repeated to form a spiral structure. It should be noted that the portion where the step B is formed is only one side surface of the coil 50 (for example, one side surface on the short side side), and the same portion, that is, the step B on the first circumference and the second circumference. A step B is formed.

In this way, the thickness of the coil piece is absorbed by the step B formed on only one side surface, so that the other three side surfaces have each coil piece as shown in the side view on the long side in FIG. It will not be tilted and will be stacked almost horizontally.

According to such a configuration, the surface of the outermost coil can be flattened without the start end SE and the end end EE of the coil 50 protruding. That is, in the spiral structure of FIGS. (A) and (b), as shown in FIG. (A), the surface (lower end surface in the drawing) of the coil 50 including the start end SE is the coil surface SF12 of the start end SE. There is a step between the coil surface SF11 and the coil surface SF11 on the opposite side that circulates around, and they are not on the same surface. Similarly, the surface of the coil 50 including the end end EE (upper end surface in the drawing) is not flush with the coil surface SF21'on the side facing the coil surface SF21'of the end end EE due to a step. When the thickness of the coil piece is relatively thin, there is little problem even if such a step occurs. However, when the coil piece is thick, it is necessary to secure a space corresponding to this step when setting it in the cassettes 51A and 51B as shown in FIG. Further, there may be a problem that the coil 50 rattles due to the gap.

On the other hand, in the spiral structure of FIGS. (C) and (d), the surface of the coil 50 including the start end SE (the lower end surface in the drawing) is the coil on the opposite side that orbits the coil surface SF12 of the start end SE. The surface SF11 is provided on the same surface (omitted), and the surface (upper end surface in the drawing) of the coil 50 including the end end EE is (omitted) the same as the coil surface SF22 on the side facing the coil surface SF21 of the end end EE. Provided on the surface. As a result, the size of the outer shape of the coil 50 can be reduced, and the adhesion to the cassettes 51A and 51B can be improved.

FIG. (E) is another example in which the spiral structure is the same as that in FIGS. (c) and (d), but the shape of the coil piece is different. As shown in FIG. 6E, the coil piece may have a square cross section (omitted) having substantially the same width W and thickness d2 of the BS in the lateral direction. When the thickness d2 is larger than the width W as described above, it is more preferable to adopt a spiral structure in which a step B is provided on one side surface of the coil 50 as shown in FIG.

FIG. 17 is a diagram showing another embodiment of the present embodiment. As shown in the figure, all the coil pieces constituting the coil 50 (all the coil pieces connected along the spiral traveling direction) have different widths W and thickness d2 of the BS in the short side direction. May be good. For example, in the coil 50 shown in the figure, the coil pieces whose thickness d2 gradually decreases as the width W of each coil piece gradually increases (WA, WB ...) From the start end SE to the end end EE. You are connected.

Not limited to this example, the configuration may be such that only the width W of each coil piece is different (changes), or only the thickness d2 of each coil piece is different (changes).

By doing so, the coil 50 of a desired quadrangular pyramid can be manufactured. Further, as in this example, when a plurality of coil pieces having different thicknesses d2 are used, if a spiral structure as shown in FIG. 16A is adopted, the thickness d2 of the coil pieces is used at the start end SE and the end end EE. The difference also causes a difference in the value of the step on the coil surface on the outermost circumference (the outermost outer circumference on the upper side and the outermost outer circumference on the lower side in the figure). As a result, the outer size of the coil 50 becomes larger and the shape becomes non-uniform (asymmetric), so that it is necessary to secure an extra space in the cassettes 51A and 51B. In addition, there is a high possibility that it will be difficult to steadily attach the cassettes 51A and 51B. In such a case, by forming a spiral structure in which a step B is formed on one side surface of the coil 50, the outermost coil surface is (omitted) flat even when the thickness d2 of each coil piece is different. (The coil surfaces SF11 and SF12 can be made the same surface, and the coil surfaces SF21 and SF22 can be made the same surface), so that the coil outer diameter 50 can be significantly reduced in size and the cassettes 51A and 51B can be used. It is possible to avoid problems during installation.

In the above example, the case where the step B is provided on one side surface which is the short side of the coil 50 has been described as an example, but the step B may be provided on one side surface which is the long side of the coil 50, and the step B may be provided. The position to be provided can be appropriately selected depending on the shape of the drawer of the start end SE and the end end EE.

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 be curved.

Further, one coil piece is not limited to one formed by punching one copper plate, and a plurality of fine flat conductors (for example, a flat conductor having a square cross-sectional shape in the longitudinal direction of the band as shown in FIG. 16E). ) May be arranged in parallel in the lateral direction of the coil. Further, the coil may be partially formed of a coil piece formed by punching a single copper plate, and partly formed of a coil piece formed by arranging fine flat conductors in parallel.

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

10 Cold pressure welding device 20 Coil manufacturing device 11 1st holding part 12 2nd holding part 50 Coil

Claims (10)

A coil manufacturing device that forms a spiral structure by joining a plurality of strip-shaped conductors that can form a spiral shape when they are made continuous.
The conductor and the other conductors are capable of sandwiching each other and are arranged so as to face each other, and include a first holding portion and a second holding portion that can move in the first direction.
The first holding portion and the second holding portion are composed of a first holding body and a second holding body that can move along a second direction, respectively.
One holding body end face composed of one end face of the first holding body and one end face of the second holding body is located in a space inside the spiral structure.
A coil manufacturing device characterized by the fact that. The end face of the holding body extends in a direction orthogonal to any of the facing surfaces of the first holding portion and the second holding portion and the facing surfaces of the first holding body and the second holding body. Is the side to do
The coil manufacturing apparatus according to claim 1. One of the first holding portion and the second holding portion holds one of the conductors or a connection body of a plurality of the conductors (hereinafter, referred to as "the previous conductor").
The other of the first holding portion and the second holding portion holds another conductor (hereinafter referred to as "later conductor").
The end of the conductor is connected to the end of the subsequent conductor in a state of being deformed in the spiral traveling direction of the spiral structure in at least a part of the region other than the vicinity of the end.
The coil manufacturing apparatus according to claim 1 or 2. The deformation is an elastic deformation and / or a plastic deformation.
The coil manufacturing apparatus according to claim 3. The thickness of at least one of the first holding body and the second holding body along the second direction is smaller than the amount allowed for deformation of the previous conductor.
The coil manufacturing apparatus according to claim 3 or 4. A plurality of strip-shaped conductors that can form a spiral structure when made continuous are prepared, and another conductor (hereinafter, “rear conductor”) is connected to one of the conductors or a connection body of the plurality of conductors (hereinafter, referred to as “the former conductor”). It is a method of manufacturing a coil that connects (called).
The end face of the front conductor and the end face of the rear conductor are spirally advanced in a state where the front conductor is deformed in the spiral traveling direction of the spiral structure in at least a part region other than the vicinity of the end portion. pressing butt direction, the end of the destination of the conductor connected to the ends of the conductor after said,
A method for manufacturing a coil, which is characterized in that. A plurality of strip-shaped conductors that can form a spiral structure when made continuous are prepared, and another conductor (hereinafter, “rear conductor”) is connected to one of the conductors or a connection body of the plurality of conductors (hereinafter, referred to as “the former conductor”). It is a method of manufacturing a coil that connects (called).
The above-mentioned conductor has at least a first side and a second side which are opposite sides in the spiral structure.
When at least a part of the first side is held by the holding portion of the connecting device, the second side is displaced from the first side along the axial direction of the spiral structure. In a state of being deformed in the spiral traveling direction as described above, there is a step of connecting the end portion of the front conductor to the end portion of the rear conductor.
The amount of deformation that shifts the second side with respect to the first side is an amount larger than the thickness of the conductor.
A method for manufacturing a coil, which is characterized in that. The deformation is an elastic deformation and / or a plastic deformation.
The method for manufacturing a coil according to claim 6 or 7, wherein the coil is manufactured. A part of the first circumference of the spiral of the spiral structure is deformed so as to form a step corresponding to the thickness of the conductor along the spiral traveling direction, and the second circumference of the spiral of the spiral structure is formed. A part of them is deformed so as to form a step corresponding to the thickness of the conductor along the spiral traveling direction.
The method for manufacturing a coil according to any one of claims 6 to 8, wherein the coil is manufactured. A method for manufacturing a coil in which a plurality of strip-shaped flat conductors that can be made continuous to form a spiral structure are prepared, and the end faces of the plurality of flat conductors are joined to form the spiral structure.
A pressure welding step of abutting and pressing one end face of the first flat conductor in the strip longitudinal direction and one end face of the second flat conductor in the strip longitudinal direction.
A removal step of removing burrs protruding in a direction intersecting the longitudinal direction of the band and the lateral direction of the band by pressing is provided.
A method for manufacturing a coil, which is characterized in that.

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