JP7371450B2 - Winding forming method and winding forming device - Google Patents

Description

The present disclosure relates to a winding forming method and a winding forming apparatus.

When winding a rectangular wire with a rectangular cross section around a winding frame, applying torque (braking torque) to the rectangular wire from the roller of a tensioner (tension applying device) creates tension on the rectangular wire (to prevent movement of the rectangular wire). A technique is known that improves the formability of a rectangular wire when it is wound around a winding frame by generating a tension force that acts as a braking force.

Japanese Patent Application Publication No. 2001-359250

The greater the tension generated in the rectangular wire, the better the formability of the rectangular wire when it is wound around the winding frame (formability into a shape that corresponds to the winding frame). If an attempt is made to increase the tension, various problems may occur due to the structure for increasing the tension. Specifically, if the pressing load applied to the rectangular wire by the roller of the tensioner is increased in order to increase the tension generated in the rectangular wire, the surface pressure generated may become excessive, leading to deformation of the rectangular wire. In this regard, by increasing the diameter of the tensioner roller, the tension can be increased without excessive contact pressure occurring on the flat wire, and the formability of the flat wire when wound around the winding frame can be improved. . However, increasing the diameter of the tensioner roller increases the rotational inertia of the roller, impairing its ability to follow the speed, making it difficult to wind the rectangular wire around the winding frame at high speed, and also requiring less space compared to the installation space. This can lead to significant limitations.

Accordingly, in one aspect, the present invention aims to improve the formability of a rectangular wire when wound onto a winding frame while reducing the disadvantages that may arise due to a configuration for increasing tension. .

One aspect is a winding forming method for winding a rectangular wire having a linear shape and a rectangular cross section around a winding frame, the method comprising:
a first tension applying device that applies tension to a portion of the flat wire that is wound around the winding frame when the flat wire is wound around the winding frame; , and a second tension applying device that acts on the surface of the short side of the cross section of the rectangular wire.

In one aspect, according to the present invention, it is possible to improve the formability of the rectangular wire during winding onto the winding frame while reducing the disadvantages that may arise due to the configuration for increasing tension. .

FIG. 3 is a perspective view of a stator. FIG. 2 is a perspective view of a portion of a plurality of concentrically wound coils in an assembled state. FIG. 2 is a perspective view of a portion of a plurality of concentrically wound coils in an assembled state. FIG. 3 is a perspective view showing only four concentrically wound coils in an assembled state. FIG. 3 is a perspective view showing a single concentric coil. It is a figure which shows the single item state of a concentric winding coil. It is a figure which shows the single item state of a concentric winding coil. FIG. 1 is a plan view schematically showing a winding forming device according to an embodiment. FIG. 2 is a side view schematically showing a winding forming device. It is a perspective view showing an example of a 1st tension applying device. It is a perspective view for explaining the arrangement|sequence of a pair of rollers and a pair of rollers in a tension|tensile_strength application unit. It is an explanatory diagram of overlap.

Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings. In the following explanation, the term "predetermined" is used to mean "predefined".
In addition, below, referring mainly to FIGS. 1 to 5B, a description will be given of a motor etc. that can be suitably manufactured using a stator coil manufactured using the winding forming method and winding forming apparatus according to the present embodiment. After an overview of the configuration, the winding forming method and winding forming apparatus according to this embodiment will be explained in detail, mainly with reference to FIG. 6A and subsequent figures.

FIG. 1 is a perspective view of a stator 12 according to one embodiment. In FIG. 1, illustration of the rotor is omitted. In the following, the axial direction, radial direction, and circumferential direction will be defined with reference to the annular stator core 14. Further, the side away from the axial center of the stator core 14 is defined as the axial outside.

The stator 12 includes a plurality of concentrically wound coils 10 and a stator core 14. A plurality of concentrically wound coils 10 are joined together to form a stator coil, as described below. The stator 12 is a stator used, for example, in a rotating electrical machine such as a three-phase AC motor. The stator 12 is a member that is disposed radially outward from a rotor (not shown) with a predetermined air gap in between, and generates a magnetic field that rotates the rotor when energized.

Stator core 14 is a member formed in a hollow cylindrical shape. A space (inner diameter space) 18 for accommodating the rotor is formed on the inner diameter side of the stator core 14 . Note that the stator core 14 may be formed by laminating a plurality of electrical steel plates coated with an insulating coating in the axial direction. Furthermore, a cylindrical yoke made of a material obtained by compression molding soft magnetic powder coated with an insulation coating may be attached to the radially outer end surface of the stator core 14.

The stator core 14 includes a back yoke 20 formed in an annular shape, and teeth 22 extending from a radially inner end surface of the back yoke 20 radially inward (towards the axial center). A plurality of teeth 22 (for example, 48 teeth) are provided in the circumferential direction of the back yoke 20, and are provided at equal intervals along the circumferential direction. A slot 24 in which the concentrically wound coil 10 is held is formed between two circumferentially adjacent teeth 22 . Each slot 24 opens radially inward and extends radially outward. Each slot 24 is formed such that the width in the circumferential direction increases toward the outer side in the radial direction. The stator core 14 is configured such that a plurality of slots 24 extend radially from the axial center.

The concentric coil 10 is formed of a flat wire having a rectangular cross section (specifically, a rectangle). This rectangular wire is made of a highly conductive metal such as copper or aluminum. Note that the cross-sectional corners of this flat wire may be rounded. A plurality of (for example, 48) concentric coils 10 are arranged circumferentially around the stator core 14 . In addition, in the following, "edgewise bending" refers to bending the surface on the short side of the cross section of a flat wire, and "flatwise bending" refers to bending the surface on the long side of the cross section of the flat wire. .

Each concentric winding coil 10 is configured such that a plurality of rectangular wires are laminated in the direction of the short side of the cross-section of the rectangular wire, and a predetermined gap is formed between adjacent rectangular wires in the lamination direction in which the rectangular wires are laminated. The structure is such that a gap is formed. For example, in the assembled state of each concentrically wound coil 10, in a certain arbitrary slot 24, the slot accommodating part 30 of a certain one concentrically wound coil 10 and the slot accommodating part of another concentrically wound coil 10 are arranged. 32 is radially sandwiched between each rectangular wire of the slot accommodating portion 32 of the other concentrically wound coil 10 between each rectangular wire of the slot accommodating portion 30 of the other concentrically wound coil 10. It becomes a state where

2A and 2B are perspective views of a part of the multiple concentrically wound coils 10 in an assembled state, FIG. 2A is a view seen from the inside in the radial direction and the outside in the axial direction, and FIG. 2B is a It is a view seen from the radially outer side and the axially inner side. FIG. 3 is a perspective view showing only the four concentrically wound coils 10 in an assembled state. FIG. 4 is a perspective view showing the concentrically wound coil 10 as a single item. 5A and 5B are diagrams showing the concentrically wound coil 10 as a single item. FIG. 5A is a top view viewed in the axial direction, and FIG. 5B is a front view.

Each concentrically wound coil 10 is a cassette coil formed by bending a flat wire wound a predetermined number of times (for example, four turns).

As shown in FIG. 4, each concentrically wound coil 10 has a slot housing portion 30, 32, a coil end portion 34, 36, a radially inner end portion 40, and a radially outer end portion 50. ing. Note that the slot accommodating portions 30 and 32 and the coil end portions 34 and 36 form a main body portion (a substantially hexagonal closed loop portion) of the concentrically wound coil 10.

The slot accommodating portions 30 and 32 are each inserted (accommodated) into the slot 24 of the stator core 14 and extend substantially linearly through the slot 24 in the axial direction. In the same concentrically wound coil 10, the slot accommodating portion 30 and the slot accommodating portion 32 are accommodated in different slots 24 separated by a predetermined distance in the circumferential direction of the stator core 14.

The coil end portions 34 and 36 are connected to the slot accommodating portions 30 and 32, respectively, and are connected to two circumferentially separated slot accommodating portions 30 and 32 that protrude axially outward from the axial end surface of the stator core 14. It is the part that connects the

The coil end portion 36 (the coil end portion on the side where the radially inner end portion 40 and the radially outer end portion 50 are formed) includes a top portion 361 and diagonal portions 362 and 363, as shown in FIG. 5B. . The oblique portions 362 and 363 are formed from both sides of the top portion 361 in the circumferential direction, and extend inwardly in the axial direction toward the slot accommodating portions 30 and 32, respectively.

The radially inner end 40 and the radially outer end 50 connect the slot accommodating parts 30 and 32 of the two circumferentially separated concentrically wound coils 10 . In the example shown in FIG. 3, four concentrically wound coils 10 are spaced 90 degrees apart in the circumferential direction, and the radially inner end 40 of one concentrically wound coil 10 is adjacent to that one concentrically wound coil 10. The two concentrically wound coils 10 are connected to each other in such a manner that they are joined to the radially outer end 50 of the other concentrically wound coil 10 . Note that the joining may be realized by welding the joint portion of the radially inner end portion 40 and the joint portion of the radially outer end portion 50 in a state where they are overlapped. In this case, the insulating coating (film) is removed from the joint between the radially inner end 40 and the radially outer end 50 before welding.

The radially inner end 40 is formed through multiple bending processes, as shown in FIG. Specifically, the radially inner end portion 40 includes a first oblique portion 402, a first edgewise bent portion 404, a first straight portion 406, a first flatwise bent portion 408, and a second straight portion. 410, a second edgewise bent portion 412, a third straight portion 414, a third edgewise bent portion 416, and a fourth straight portion 418.

The radially outer end portion 50 is formed through multiple bending operations, as shown in FIG. 4 . Specifically, the radially outer end portion 50 includes a second oblique portion 502, a fourth edgewise bent portion 504, a fifth straight portion 506, a second flatwise bent portion 508, and a sixth straight portion. 510.

In this way, the radially inner end 40 and the radially outer end 50 have various bends (such as the first edgewise bend 404). Note that although a specific configuration of the concentrically wound coil 10 has been described here, the detailed configuration of the concentrically wound coil 10 is arbitrary. For example, the shapes of the radially inner end 40 and the radially outer end 50 are arbitrary.

Next, a winding forming method and a winding forming apparatus 60 according to an embodiment will be described in detail with reference to FIG. 6A and subsequent figures.

Note that each of the above-mentioned concentrically wound coils 10 is formed from a single straight rectangular wire. Specifically, a single straight rectangular wire is formed into a substantially hexagonal shape by a winding forming device 60, which will be explained in detail below, and wound several times, and then wound around the radially inner side of the concentrically wound coil 10. The portion other than the end portion 40 and the radially outer end portion 50 (the main body portion of the concentrically wound coil 10, that is, the substantially hexagonal closed loop portion) is shaped into the final shape (see FIG. 4) by a forming device (not shown). formed into. Next, the concentrically wound coil 10 is coated at the joint portions of the radially inner end 40 and the radially outer end 50 by a coating device (not shown), and then a molding machine (not shown) It is then bent and formed into the final shape (see Figure 4).

FIG. 6A is a plan view schematically showing a winding forming device 60 according to one embodiment, and FIG. 6B is a side view schematically showing the winding forming device 60. Note that, in FIGS. 6A and 6B, the winding forming device 60 and the rectangular wire 7 processed by the winding forming device 60 are schematically shown.

In FIG. 6B, the vertical direction is defined as the Z direction, and the Z1 side in the Z direction is the upper side. In addition, in FIGS. 6A and 6B, the moving direction (conveying direction) of the flat wire 7 (the flat wire 7 for forming the concentrically wound coil 10) is defined as the X direction, and the X1 side along the X direction The X2 side is defined. In this case, the X1 side is the downstream side in the conveyance direction of the flat wire 7. Further, in FIG. 6A, a Y direction is defined that is orthogonal to both the X direction and the Z direction.

As shown in FIGS. 6A and 6B, the winding forming device 60 includes, from the upstream side, a bobbin 61, a strainer 62, a tensioning unit (tensioner) 63, a handling/cutting unit 64, and a winding unit 65. including.

A rectangular wire 7 for forming the concentrically wound coil 10 is wound around the bobbin 61 as a raw material. Initially, the rectangular wire 7 is wound around the bobbin 61 in a length sufficient to form a plurality of concentrically wound coils 10 . When the winding unit 65 operates, the flat wire 7 is unwound from the bobbin 61 accordingly. The rectangular wire 7 may be unwound in such a manner that the long side surface of the cross section faces in the vertical direction (Z direction).

The strainer 62 has a function of increasing the straightness of the rectangular wire 7 unwound from the bobbin 61 (that is, a function of correcting curl etc.). As schematically shown in FIGS. 6A and 6B, the strainer 62 includes a plurality of rollers 621 acting on the long side surface of the cross section of the flat wire 7 from both sides in the Z direction, and a plurality of rollers 621 acting on the short side side of the cross section of the flat wire 7. A plurality of rollers 622 act on the surface from both sides in the Y direction. Note that the number of the plurality of rollers 621 and the number of the plurality of rollers 622 and their arrangement are arbitrary. In a modified example, one or both of the rollers 621 and 622 may be omitted.

Note that, like the tension applying unit 63, the strainer 62 can generate tension in the portion of the flat wire 7 that is wound around the winding frame 651 when winding the flat wire 7 around the winding frame 651; The magnitude of the tension is significantly smaller than the magnitude of the tension applied by the tension applying unit 63.

When winding the flat wire 7 around the winding frame 651, the tension applying unit 63 generates tension in a portion of the flat wire 7 that is wound around the winding frame 651. That is, when winding the flat wire 7 around the winding frame 651, the tension applying unit 63 generates a tension that acts as a braking force against the movement of the flat wire 7 (movement toward the X1 side in the X direction). Specifically, when the flat wire 7 is wound around the winding frame 651, the part of the flat wire 7 that is wound around the winding frame 651 (that is, the part that is about to reach the winding frame 651) is Move to the winding frame 651. At this time, the tension applying unit 63 generates a braking force that prevents the portion of the rectangular wire 7 from moving toward the winding frame 651, and as a result, tension is generated in the portion of the rectangular wire 7. In this way, when winding the flat wire 7 around the winding frame 651 while generating tension in the flat wire 7, the formability of the flat wire 7 during winding becomes good, and the shape of the winding frame 651 is improved. The rectangular wire 7 can be formed in a manner that follows.

The tension applying unit 63 includes a first tension applying device 631 and a second tension applying device 632, as schematically shown in FIGS. 6A and 6B.

The first tension applying device 631 acts on the surface of the flat wire 7 on the long side of the cross section. In this embodiment, as an example, a total of three first tension applying devices 631 are provided at separate positions in the X direction. However, the number of first tension applying devices 631 is arbitrary and may be one or two, or four or more.

Each of the first tension applying devices 631 includes an upper and lower pair of rollers 6311 and 6312. The rotation axes of the pair of rollers 6311 and 6312 are parallel to the Y direction. The pair of rollers 6311 and 6312 have outer peripheral surfaces that come into contact with the rectangular wire 7. The pair of rollers 6311 and 6312 form a portion (nip portion) in which the rectangular wire 7 is held between their outer peripheral surfaces. The pair of rollers 6311 and 6312 sandwich the long side surface of the cross section of the flat wire 7 from above and below at the nip portion, and apply force (control) in the direction toward the X direction X2 side to the long side surface of the cross section of the flat wire 7. Torque is applied in a manner that generates power (power). This torque corresponds to, for example, a counter torque (braking torque) that opposes the rotation of the roller 6311 around the rotation axis. In this case, the tension that can be applied by the first tension applying device 631 increases as the load (vertical pressing load from the first tension applying device 631) acting on the long side surface of the cross section of the flat wire 7 increases. Note that the pressing load acting on the surface of the long side of the cross section of the rectangular wire 7 increases as the vertical distance between the pair of rollers 6311 and 6312 becomes smaller. The vertical distance between the pair of rollers 6311 and 6312 may be adjustable. Note that the pressing load applied to the long side surface of the flat wire 7 by the pair of rollers 6311 and 6312 may be maximized within a range that does not cause undesirable deformation of the flat wire 7.

Note that increasing the radius (rotation radius) of each of the rollers 6311 and 6312 is disadvantageous in that the rotational inertia increases and the ability to follow the speed (velocity in the conveying direction of the rectangular wire 7) is likely to be impaired. On the other hand, it is advantageous from the viewpoint of reducing the surface pressure generated on the long side surface of the rectangular wire 7. Therefore, the radius of each of the pair of rollers 6311 and 6312 is determined in consideration of these tradeoffs, so as to reduce the surface pressure generated on the long side surface of the cross section of the rectangular wire 7 and to prevent the rotational inertia from becoming excessive. Adapted. In addition, in this embodiment, as an example, the respective radii of the rollers 6311 and 6312 are the same, but they may be different.

The second tension applying device 632 acts on the surface of the flat wire 7 on the short side of the cross section. In this embodiment, as an example, a total of two second tension applying devices 632 are provided at separate positions in the X direction. However, the number of second tension applying devices 632 is arbitrary and may be one or three or more.

Each of the second tension applying devices 632 includes a pair of rollers 6321 and 6322 on both sides in the Y direction. The rotation axes of the pair of rollers 6321 and 6322 are parallel to the Z direction. The pair of rollers 6321 and 6322 have outer circumferential surfaces that come into contact with the rectangular wire 7. The pair of rollers 6321 and 6322 form a portion (nip portion) in which the rectangular wire 7 is held between their outer peripheral surfaces. The pair of rollers 6321 and 6322 nip the surface of the short side of the cross section of the flat wire 7 from both sides in the Y direction, and apply a force ( Torque is applied in a manner that generates braking force. This torque corresponds to, for example, a counter torque (braking torque) that opposes the rotation of the roller 6321 around the rotation axis. In this case, the tension that can be applied by the second tension applying device 632 increases as the load acting on the short side surface of the rectangular wire 7 (pressing load in the Y direction from the second tension applying device 632) increases. Note that the pressing load acting on the short side surface of the rectangular wire 7 increases as the distance between the pair of rollers 6321 and 6322 in the Y direction becomes smaller. The distance between the pair of rollers 6321, 6322 in the Y direction may be adjustable. Note that the pressing load applied to the short side surface of the rectangular wire 7 by the pair of rollers 6321 and 6322 may be maximized within a range that does not cause undesirable deformation of the rectangular wire 7.

Note that increasing the radius (rotation radius) of each of the rollers 6321 and 6322 is disadvantageous in that the rotational inertia increases and the ability to follow the speed (velocity in the conveying direction of the rectangular wire 7) is likely to be impaired. On the other hand, it is advantageous from the viewpoint of reducing the surface pressure generated on the short side of the cross section of the rectangular wire 7. Therefore, the radius of each of the pair of rollers 6321 and 6322 is determined in consideration of these tradeoffs, so as to reduce the surface pressure generated on the short side of the cross section of the rectangular wire 7 and to prevent the rotational inertia from becoming excessive. Adapted. Note that in this embodiment, as an example, the radius of each of the rollers 6321 and 6322 is the same, but may be different.

The handling/cutting unit 64 cuts the flat wire 7 when the flat wire 7 is wound around the winding frame 651 to an appropriate length (length corresponding to one concentric winding coil 10), 7 and performs various necessary processes such as setting it on the winding frame 651. Note that some or all of the functions of the handling/cutting unit 64 may be realized manually by an operator.

The winding unit 65 includes a winding frame 651. The winding frame 651 rotates around the rotation axis I2 in the vertical direction, as shown in FIG. 6B. The winding frame 651 is rotationally driven by an actuator (not shown). By winding the rectangular wire 7, the shape of the concentrically wound coil 10 other than the radially inner end 40 and the radially outer end 50 as shown in FIG. The main body portion of the coil 10 may be configured to have a substantially hexagonal shape. Note that the rotational speed of the winding frame 651 when winding the flat wire 7 may be constant or may be changed as appropriate.

FIG. 7 is a perspective view showing an example of the first tension applying device 631 of the tension applying unit 63. Note that the second tension applying device 632 is substantially the same except that the direction of the pair of rollers is different as described above. In FIG. 7, the roller 6311 is shown partially removed so that the inside of the roller 6311 can be seen. Note that FIG. 7 also shows the rectangular wire 7.

In the example shown in FIG. 7, the roller 6311 can be moved up and down in the up and down direction (Z direction) by the up and down lifting mechanism 6314. Specifically, the tension applying unit 63 includes an actuator 63141, and when the actuator 63141 is driven, the support shaft 63114 of the roller 6311 moves up and down. The roller 6311 has a built-in torque generator 63112, and the torque generator 63112 generates a counter-torque that produces the above-mentioned tension. In the torque generator 63112, for example, a friction material is provided between an inner ring fixed to a support shaft 63114 and a rotating outer ring, and the friction material is pressed radially outward with a spring to generate friction torque (as described above). (frictional torque) that acts as a counter-torque. In this configuration, as described above, the magnitude of the tension described above can be controlled (adjusted) by increasing or decreasing the vertical distance between the pair of rollers 6311 and 6312 using the actuator 63141 and the vertical lifting mechanism 6314.

FIG. 8 is a perspective view for explaining the arrangement of the pair of rollers 6311 and 6312 and the pair of rollers 6321 and 6322 in the tension applying unit 63. FIG. 9 is a schematic top view for explaining the overlap. Note that the rectangular wire 7 is also shown in FIGS. 8 and 9.

The first tensioning device 631 and the second tensioning device 632 are preferably provided alternately, as shown in FIG.

In this embodiment, as an example, the tension applying unit 63 includes three first tension applying devices 631 and two second tension applying devices 632 alternately along the X direction, as shown in FIGS. 8 and 9. will be placed in By arranging them alternately, the dimension (arrangement space) in the X direction of the tension applying unit 63 as a whole can be reduced. Specifically, the pair of rollers 6311 and 6312 of one first tension applying device 631 and the pair of rollers 6321 and 6322 of one second tension applying device 632 that are adjacent to each other in the X direction overlap in the X direction. Since the tension applying unit 63 can be arranged in the same manner, the dimension (arrangement space) of the tension applying unit 63 as a whole in the X direction can be reduced accordingly. Note that, as shown in FIG. 9, such overlap is caused by the radius of the pair of rollers 6311, 6312 being R1, the radius of the pair of rollers 6321, 6322 being R2, and the rotation axis of the pair of rollers 6311, 6312. When the distance in the X direction between the rotating shafts of the pair of rollers 6321 and 6322 is L1, the relationship is L1<R1+R2.

When using such a winding forming device 60, the tension applying unit 63 can simultaneously generate tension on the flat wire 7 using the first tension applying device 631 and the second tension applying device 632. That is, in this embodiment, the flat wire 7 is wound around the winding frame 651 of the winding unit 65 while the first tension applying device 631 and the second tension applying device 632 simultaneously generate tension on the flat wire 7. It can be turned.

In this embodiment, since the first tension applying devices 631 are arranged at both ends of the tension applying unit 63 in the X direction, the rectangular wire 7 being conveyed is placed in the Z direction at both ends of the tension applying unit 63 in the X direction. This can reduce the possibility of misalignment. However, in a modified example, the second tension applying device 632 may be arranged at both ends of the tension applying unit 63 in the X direction, or the first tension applying device 632 may be disposed at one end of the tension applying unit 63 in the X direction. 631 and the second tension applying device 632 may be arranged, and the other of the first tension applying device 631 and the second tension applying device 632 may be arranged at the other end.

In this embodiment, the Z direction corresponds to the up-down direction, but a configuration may be adopted in which the Y-direction corresponds to the up-down direction.

According to this embodiment, the following excellent effects are particularly achieved.

According to the winding forming device 60 of this embodiment, as described above, tension can be simultaneously generated on the rectangular wire 7 by the first tension applying device 631 and the second tension applying device 632. A winding forming method is provided in which a flat wire 7 is wound around a winding frame 651 of a winding unit 65 while tension is simultaneously generated on the flat wire 7 by a first tension applying device 631 and a second tension applying device 632. realizable.

As described above, the greater the tension generated in the rectangular wire 7, the better the formability when winding the rectangular wire 7 around the winding frame 651 of the winding unit 65.

In this regard, according to the present embodiment, tension can be generated in the flat wire 7 at the same time by the first tension applying device 631 and the second tension applying device 632, so that a relatively large tension can be generated in the flat wire 7. I can do it. Therefore, according to this embodiment, a relatively large tension can be generated in the rectangular wire 7 without making the diameters of the pair of rollers 6311 and 6312 and the diameters of the pair of rollers 6321 and 6322 excessively large. This may cause disadvantages that may arise due to the structure for increasing tension (as mentioned above, the rectangular wire 7 may be deformed due to an increase in surface pressure, or may occur due to an increase in the roller diameter). It is possible to improve the formability of the rectangular wire 7 when winding it around the winding frame 651 while reducing problems such as difficulty in winding the rectangular wire 7 around the winding frame 651.

In addition, in this embodiment, the number of paired rollers 6311 and 6312 and the number of paired rollers 6321 and 6322 are such that good formability can be ensured without excessive contact pressure being applied to the rectangular wire 7. may be adapted as appropriate.

Further, according to the present embodiment, the first tension applying device 631 acts on the surface of the flat wire 7 on the long side of the cross section, and the second tension applying device 632 acts on the surface of the flat wire 7 on the short side of the cross section. Therefore, efficient arrangement can be realized. That is, in the present embodiment, in which a total of N first tension applying devices 631 and second tension applying devices 632 can be provided, for example, a configuration including only N first tension applying devices 631 or a configuration including only N second tension applying devices 632 is possible. Compared to a configuration including only the application device 632, more efficient arrangement can be achieved. This is because, as described above with reference to FIGS. 8 and 9, the pair of rollers 6311 and 6312 and the pair of rollers 6321 and 6322 can be arranged to overlap.

In this way, according to this embodiment, the tension generated in the rectangular wire 7 can be increased efficiently from the viewpoint of the arrangement space. That is, while reducing the inconvenience that may occur due to the configuration for increasing the tension (the inconvenience that a relatively large installation space is required due to the increase in the number of tension applying devices), The tension can be effectively increased.

Further, according to this embodiment, the first tension applying device 631 can apply a pressing load to the surface on the long side of the cross section of the flat wire 7, and the second tension applying device 632 can apply a pressing load to the surface on the short side of the cross section of the flat wire 7. Since a pressing load can be applied to the surface, the first tension applying device 631 and the second tension applying device 632 can also realize the function of the strainer 62 (the function of correcting the curl etc. of the flat wire 7 and ensuring straightness). . Therefore, it may be possible to omit part or all of the strainer 62 to realize an efficient configuration.

Although each embodiment has been described in detail above, it is not limited to a specific embodiment, and various modifications and changes can be made within the scope of the claims. It is also possible to combine all or a plurality of the components of the embodiments described above.

For example, in the embodiment described above, the rectangular wire 7 unwound from the bobbin 61 is wound around the winding frame 651, but the present invention is not limited to this. For example, a configuration may be adopted in which a straight rectangular wire 7 having a length to form one concentric coil is supplied from the upstream side of the strainer 62 or the tension applying unit 63. However, in general, it is more advantageous to use the bobbin 61 from the viewpoint of productivity.

<Additional notes>
Regarding the above embodiments, the following will be further disclosed. Note that, among the effects described below, effects related to each form additional to one form are additional effects resulting from each additional form.

(1) One form is a winding forming method in which a rectangular wire (7) having a linear form and a rectangular cross section is wound around a winding frame (651),
When winding the flat wire around the winding frame, a first tension applying device ( 631) and a second tension applying device (632) that acts on the surface of the short side of the cross section of the rectangular wire.

According to this embodiment, tension can be generated by a plurality of tension applying devices by utilizing all four surfaces of the rectangular wire (two surfaces on the short side of the cross section and two surfaces on the long side of the cross section). can. This may cause disadvantages that may arise due to the configuration for increasing the tension (as mentioned above, the rectangular wire may be deformed due to an increase in surface pressure, or may arise due to the increase in roller diameter). It is possible to improve the formability of the rectangular wire when it is wound around the winding frame while reducing the disadvantages such as difficulty in winding the rectangular wire around the frame.

(2) In the present embodiment, preferably, the first tension applying device and the second tension applying device each include a pair of rollers (6311, 6312; 6321, 6322) capable of sandwiching the rectangular wire. including,
The pair of rollers (6311, 6312) of the first tension applying device and the pair of rollers (6321, 6322) of the second tension applying device overlap in the conveyance direction (X direction) of the rectangular wire. will be placed.

In this case, compared to the case where the pair of rollers of the first tension applying device and the pair of rollers of the second tension applying device are arranged without overlapping, the arrangement space along the conveyance direction can be reduced. Therefore, while reducing the inconvenience that may arise due to the configuration for increasing the tension (the inconvenience that a relatively large installation space is required due to the increase in the number of tension applying devices), it is possible to Can increase tension.

(3) In the present embodiment, preferably, when winding the flat wire around the winding frame while unwinding the flat wire from the bobbin (61), the first tension applying device and the second tension The tension is generated by an application device.

In this case, while continuously unwinding the flat wire from the bobbin, a relatively large tension can be generated in the flat wire by the first tension applying device and the second tension applying device. This makes it possible to improve the formability of the rectangular wire during winding around the winding frame while increasing productivity.

(4) Another form is a winding forming device (60) that winds a rectangular wire (7) having a linear shape and a rectangular cross section around a winding frame (651),
a first tension applying device (631) that acts on the long side surface of the cross section of the flat wire;
a second tension applying device (632) that acts on a surface on the short side of the cross section of the rectangular wire;
The first tension applying device and the second tension applying device are wire winding devices that simultaneously generate tension in a portion of the flat wire that is wound around the winding frame when the flat wire is wound around the winding frame. It is a forming device.

According to this embodiment, tension can be generated by a plurality of tension applying devices by utilizing all four sides of the rectangular wire. This may cause disadvantages that may arise due to the configuration for increasing the tension (as mentioned above, the rectangular wire may be deformed due to an increase in surface pressure, or may arise due to the increase in roller diameter). It is possible to improve the formability of the rectangular wire when it is wound around the winding frame while reducing the disadvantages such as difficulty in winding the rectangular wire around the frame.

(5) In the present embodiment, preferably, the first tension applying device and the second tension applying device each include a pair of rollers (6311, 6312; 6321, 6322) capable of sandwiching the rectangular wire. including,
The pair of rollers (6311, 6312) of the first tension applying device and the pair of rollers (6321, 6322) of the second tension applying device overlap in the conveyance direction (X direction) of the rectangular wire. will be placed.

In this case, compared to the case where the pair of rollers of the first tension applying device and the pair of rollers of the second tension applying device are arranged without overlapping, the arrangement space along the conveyance direction can be reduced. Therefore, while reducing the inconvenience that may arise due to the configuration for increasing the tension (the inconvenience that a relatively large installation space is required due to the increase in the number of tension applying devices), it is possible to Can increase tension.

(6) In this embodiment, preferably, the first tension applying device and the second tension applying device include a bobbin (61) that supplies the flat wire to be wound around the winding frame, and a bobbin (61) that supplies the flat wire to be wound around the winding frame. placed between.

In this case, while continuously unwinding the flat wire from the bobbin, a relatively large tension can be generated in the flat wire by the first tension applying device and the second tension applying device. This makes it possible to improve the formability of the rectangular wire during winding around the winding frame while increasing productivity.

7 Flat wire 10 Concentrically wound coil 12 Stator 14 Stator core 24 Slot 30, 32 Slot accommodating part 34, 36 Coil end part 40 Radial inner end part 402 First oblique part 404 First edgewise bent part 406 First straight part 408 First flatwise bent part 410 Second straight part 412 Second edgewise bent part 414 Third straight part 416 Third edgewise bent part 418 Fourth straight part 50 Radial outer end 502 Second oblique part 504 4 edgewise bent portion 506 5th straight portion 508 2nd flatwise bent portion 510 6th straight portion 60 Winding forming device 61 Bobbin 62 Strainer 63 Tension applying unit (tensioner)
64 Handling/cutting unit 65 Winding unit 621 Roller 622 Roller 631 First tension applying device 632 Second tension applying device 651 Winding frame 6311 Roller 6312 Roller 6314 Vertical lifting mechanism 6321 Roller 6322 Roller 63112 Torque generator 63114 Support shaft 63141 Actuator Ta

Claims (6)

A winding forming method for winding a rectangular wire having a straight shape and a rectangular cross section around a winding frame, the method comprising:
a first tension applying device that applies tension to a portion of the flat wire that is wound around the winding frame when the flat wire is wound around the winding frame; , and a second tension applying device that acts on the surface of the short side of the cross section of the rectangular wire,
The first tension applying device and the second tension applying device each include a pair of rollers capable of sandwiching the rectangular wire, and the tension is generated by a torque that resists rotation of the rollers. The wire winding according to claim 1, wherein the pair of rollers of the first tension applying device and the pair of rollers of the second tension applying device are arranged to overlap in the conveyance direction of the flat wire. Formation method. 3. The tension is generated by the first tension applying device and the second tension applying device when winding the flat wire around the winding frame while unwinding the flat wire from a bobbin. winding formation method. A winding forming device for winding a rectangular wire having a linear shape and a rectangular cross section around a winding frame,
a first tension applying device that acts on a long side surface of the cross section of the flat wire;
and a second tension applying device that acts on a surface on the short side of the cross section of the flat wire,
The first tension applying device and the second tension applying device simultaneously generate tension in a portion of the flat wire that is wound around the winding frame when winding the flat wire around the winding frame ,
The first tension applying device and the second tension applying device each include a pair of rollers capable of sandwiching the rectangular wire, and the winding forming device generates the tension by a torque that resists rotation of the rollers. The first tension applying device and the second tension applying device each include a pair of rollers capable of sandwiching the flat wire,
The winding formation according to claim 4, wherein the pair of rollers of the first tension applying device and the pair of rollers of the second tension applying device are arranged to overlap in the conveying direction of the flat wire. Device. The first tension applying device and the second tension applying device are arranged between the bobbin that supplies the flat wire wound around the winding frame and the winding frame, according to claim 4 or 5. Winding forming device.