JP2016152652A - Winding device for flat wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding device for a flat wire capable of performing secure bending regardless of the size of a curvature radius of the flat wire after the bending by preventing a bending receiving jig from being rotated during bending.SOLUTION: The winding device for the flat wire performs coil winding by bending a flat wire 50. The winding device comprises: a bed member 10 including a bed surface 12 in contact with a lower bottom face 52 of the flat wire; a clamp member 30 that holds the flat wire together with the bed surface in a thickness direction; and a bending receiving member 13 for receiving an inner side face 53 of the flat wire. The clamp member includes: a columnar shaft part 33; and a clamp part 31 in contact with an upper bottom face 51 of the flat wire. In the bending receiving member, a side face 14 at least partially defines an inner side face regulation part in contact with the inner side face of the flat wire during bending, and the bending receiving member is positioned by the side of the shaft part, has thickness equal to that of the flat wire and is integrated with the bed member.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a flat wire winding apparatus for bending a flat wire for coil winding. More specifically, the inner surface of the bent rectangular wire is received by a bending receiving jig, and the winding of the rectangular wire is performed so that the bending receiving jig can be prevented from rotating during the bending process so that the bending can be reliably performed. The present invention relates to a wire device.

  Conventionally, in a coil attached to a rotor or stator of a rotating electric machine such as a motor or a generator, a rectangular wire has been used as an element wire in order to improve the space factor. A coil using a flat wire as an element wire is called an edgewise coil. When using a flat wire, the bending process for winding is somewhat more difficult than when using a round wire. For this reason, several bending techniques for rectangular wires have been proposed.

  In Patent Document 1 as an example, a flat wire is sandwiched and restrained by a pair of upper and lower pairs, and bending is performed in the restrained state. The reason for restraining the flat wire is to suppress the bulging because the in-corner portion of the bent portion of the flat wire tends to bulge in the thickness direction during bending. When restraining, a spacer (bending receiving member) is applied to the surface that is the inner side surface of the bending in the flat wire. Here, a spacer having a thickness equivalent to the thickness after bending of a rectangular wire is used (FIG. 9 of Patent Document 1). As a result, the increase in the thickness of the in-corner portion of the flat wire during bending is suppressed as much as possible. Note that one of the above-described upper and lower pair members is usually configured by a shaft portion and a flange portion, and the above-described spacer is located around the shaft portion.

JP 2008-228435 A

  However, the conventional techniques described above have the following problems. That is, the spacer may rotate around the shaft during processing, which may hinder processing. For this reason, the side surface shape of the spacer was practically limited to a circle. If the side surface of the spacer is not circular, that is, if the inner surface of the rectangular wire is to be defined at a specific orientation on the side surface of the spacer, the processed shape itself will not be as intended when the spacer rotates. It is.

  In particular, stress concentration during machining could not be sufficiently relaxed when trying to obtain a machined shape with a small curvature radius by bending a flat wire strongly. When bending a rectangular wire while restraining it in the thickness direction, stress concentrates on the connecting portion between the shaft portion and the flange portion of one restraining member. For this reason, the relaxation is achieved as described in [0022] of Patent Document 1. However, in order to obtain a post-processed shape with a small radius of curvature, the spacer must be a small diameter circle. Since the chamfered portion cannot be made large with this, only the small R-shaped portion can be formed. For this reason, the stress concentration cannot be sufficiently relaxed. On the other hand, as shown in the graph of FIG. 1, the smaller the radius of curvature after processing (to the left in the graph), the more intense the stress concentration on the restraining member. For this reason, it was difficult to bend the flat wire strongly.

  The present invention has been made to solve the above-described problems of the prior art. That is, the problem is that the winding of the rectangular wire prevents the rotation of the bending receiving jig during bending so that the bending can be reliably performed regardless of the curvature radius of the flat wire after bending. It is to provide a wire device.

  A winding device for a rectangular wire according to an aspect of the present invention is a device for winding a coil by bending a rectangular wire having a square cross-sectional shape, and has a foundation surface that contacts a lower bottom surface of the bent rectangular wire A clamp member that sandwiches the bent rectangular wire with the base surface in the thickness direction, and a bending receiving member that receives the inner surface of the bent rectangular wire, and the clamp member is bent with a columnar shaft portion The bending receiving member has an inner surface defining portion that is in contact with the inner surface of the flat wire to be bent during bending. , Located on the side of the shaft, has a thickness equivalent to the thickness of the flat wire to be bent, and is integrated with the base member.

  In the rectangular wire winding device in the above embodiment, the rectangular wire is bent as follows. First, the flat wire is sandwiched between the base surface of the base member and the clamp portion of the clamp member. In this state, the rectangular wire is bent so that the inner surface thereof is along the inner surface defining portion that is a part of the side surface of the bending receiving member. Thus, a rectangular wire can be wound and formed into a coil or the like.

  Here, due to the restraint by the base surface and the clamp portion, the in-corner portion of the flat wire is prevented from bulging. Moreover, since the bending receiving member is integral with the base member, it does not rotate. For this reason, a bending shape is not prescribed | regulated by site | parts other than an inner surface regulation part among the side surfaces of a bending receiving member at the time of a bending process. Further, since the diameter of the inner side surface defining portion can be set regardless of the diameter of the shaft portion, the stress of the clamp member can be sufficiently relaxed even if the radius of curvature of the flat wire after processing is reduced.

  According to this configuration, the winding device for a rectangular wire that prevents the bending receiving jig from rotating during bending and enables reliable bending regardless of the radius of curvature of the flat wire after bending. Is provided.

It is a graph which shows the relationship between the curvature radius after bending, and the grade of stress concentration. It is sectional drawing which shows the structure of the winding apparatus of the flat wire which concerns on embodiment. It is a top view which shows the structure of the winding apparatus of the flat wire which concerns on embodiment. It is a front view of the stator which is one application example of a coil. It is a front view of an example of the coil attached to a stator. It is a front view which shows the protrusion part from the stator of the coil wound by the prior art. It is a front view which shows the protrusion part from the stator of the coil wound with the technique of embodiment.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the accompanying drawings. The rectangular wire winding device according to this embodiment is configured as shown in FIG. The winding device 1 of the present embodiment shown in FIG. 2 has a base member 10 and a clamp member 30, and is a device that performs a bending process of bending a flat wire 50 at a right angle to form a coil.

The base member 10 includes a base portion 11 and a bending receiving portion 13, and these are integrated as a whole. The base portion 11 of the base member 10 has a cylindrical shape as a whole, and a hole portion 15 is formed at the center. The hole portion 15 is formed not only in the base portion 11 but also in the bending receiving portion 13. The hole portion 15 penetrates the bending receiving portion 13. The upper surface of the base portion 11 is a base surface 12 that is a flat surface. The bending receiving portion 13 is provided so as to protrude upward from the base surface 12 and has a smaller diameter than the base portion 11 as a whole. However, as shown in FIG. 3, unlike the base portion 11, the bending receiving portion 13 is not circular as viewed from above. Bend receiving part 13 and base 12
Hereinafter, the side surface is referred to as a bending receiving surface 14.

  The clamp member 30 has a disk-shaped flange portion 31 and a shaft-shaped shaft portion 33, and is an umbrella-shaped member as a whole. The shaft portion 33 is inserted into the hole portion 15 of the base member 10. For this reason, the bending receiving portion 13 exists on the side of the shaft portion 33. The lower surface in FIG. 2 in the flange portion 31 is hereinafter referred to as a clamp surface 32. The clamp surface 32 is wider than the range where the bending receiving portion 13 is provided, and is formed to have a size that covers almost the entire range where the base portion 11 is projected upward. For this reason, the clamp surface 32 and the base surface 12 face each other. A flat wire 50 as a workpiece is sandwiched between the clamp surface 32 and the base surface 12.

  In addition, the connection part 34 of the flange part 31 and the axial part 33 in the clamp member 30 is made into the concave curved surface shape. In accordance with this, the shoulder portion 16 at the entrance of the hole 15 in the bending receiving portion 13 is also chamfered (convex curved surface in FIG. 2). Thereby, the stress relaxation described in [0022] of Patent Document 1 is achieved.

  The rectangular wire 50 is a conducting wire having a rectangular cross section, and what is visible in FIG. 2 is the cross section. The rectangular wire 50 having a rectangular cross section is sandwiched between the upper and lower clamp surfaces 32 and the base surface 12 with the long side surfaces 51 and 52 facing each other. The flat wire 50 also has one short side surface 53 facing the bending receiving surface 14 of the bending receiving portion 13. The winding device 1 is further provided with a fixed guide member 60 positioned outside the flat wire 50. Further, as can be seen from FIG. 2, the rising height of the bending receiving surface 14, that is, the thickness of the bending receiving portion 13 is equal to the thickness of the flat wire 50.

  FIG. 3 shows a plan view of the base member 10, the flat wire 50, and the fixed guide member 60 in FIG. 2 as viewed from above. A rectangular wire 50 shown in FIG. 3 is obtained when bending is performed by the winding device 1. As shown in FIG. 3, the bending receiving portion 13 has a substantially rectangular shape when viewed from above. More specifically, a first straight portion 17, a second straight portion 18, and a turn portion 19 therebetween are formed as a part of the bending receiving surface 14. The radius of curvature of the turn portion 19 is smaller than the radius of the hole portion 15. The position of the fixed guide member 60 in FIG. 3 is a position that guides the position facing the first straight portion 17, that is, the position of the flat wire 50 that remains the straight portion before and after processing.

  The winding device 1 is further provided with a movable guide member 61. Whereas the position of the fixed guide member 60 is fixed, the movable guide member 61 takes two positions, a solid line position and a two-dot chain line position in FIG. Note that the cross-sectional view shown in FIG. 2 corresponds to a cross-section at the position AA in FIG. Moreover, the flat wire 50 shown in FIG. 3 is a thing after a bending process. Further, a circle E in FIG. 3 is a circle at the outermost edge of the chamfered shape of the shoulder portion 16. This has at least a diameter equal to or larger than the outermost circle of the concave curved surface shape of the connection portion 34. The example in FIG. 2 is almost the same.

  The bending process of the rectangular wire 50 by the winding device 1 of this embodiment is performed as follows. First, the movable guide member 61 of the winding device 1 is set to a position indicated by a two-dot chain line in FIG. In this state, the flat wire 50 before bending is entered between the bending receiving portion 13 and the fixed guide member 60 from above in FIG. The position to be bent in the flat wire 50 is positioned around the turn portion 19 of the bending receiving surface 14. In this state, a part of one short side surface 53 of the flat wire 50 faces the first straight portion 17 of the bending receiving surface 14. In this state, the clamp member 30 is pressed toward the base member 10 as indicated by an arrow F in FIG. As a result, the flat wire 50 is sandwiched between the clamp surface 32 and the base surface 12. At this time, the flat wire 50 has the long side surfaces 51 and 52 facing the clamp surface 32 and the base surface 12.

  In this state, the movable guide member 61 is moved from the position of the two-dot chain line in FIG. 3 to the position of the solid line. As a result, the flat wire 50 is bent, and the state shown in FIG. 3 is obtained. One short side surface 53 of the flat wire 50 after bending shown in FIG. 3 is in contact with all of the first straight portion 17, the turn portion 19, and the second straight portion 18. Thus, the fixed guide member 60 and the movable guide member 61 cooperate to guide the outside of the flat wire 50 when the flat wire 50 is bent, and the short side surface 53 becomes the bending receiving surface 14. It can be said that it works along the way.

  Here, the flat wire 50 in FIG. 3 seems to be slightly bent more than the right angle. However, when the movable guide member 61 is returned from the position of the solid line to the position of the two-dot chain line, the bending of the flat wire 50 is also slightly returned and becomes a right angle. This is because the bending of the rectangular wire 50 by the winding device 1 is plastic deformation, but inevitably some elastic deformation component exists. The shape of the bending receiving portion 13 is set so that it becomes a right angle in a state where the bending is slightly returned.

  After returning the movable guide member 61 to the position of the two-dot chain line, the rectangular wire 50 after processing is further advanced downward from the top in FIG. Wise coils can be wound. The procedure is the same as that shown in FIGS.

  The bending of the flat wire 50 by the winding device 1 described above has the following various features. First, the bending of the flat wire 50 can be performed stably and reliably. This is because the bending receiving portion 13 is integrated with the base portion 11 and therefore does not rotate during bending. If the bending receiving portion 13 is separate from the base portion 11, the problem described in the column [Problems to be solved by the invention] may occur. There is no such problem in the winding device 1 of this embodiment.

  Further, the radius of curvature of the bent portion of the flat wire 50 is quite small. This is because the radius of curvature of the turn portion 19 is small as described above. This makes it possible to manufacture just-sized edgewise coils for the required locations. This will be described with reference to FIGS. As an application example of the edgewise coil, there is a coil attached to a rotor or stator of a rotating electric machine such as a motor or a generator. FIG. 4 shows an example of a stator. Although the stator 70 is viewed from the outside in FIG. 4, a large number of coils 71 are attached to the inner surface of the stator 70. In FIG. 4, only the vicinity of the upper and lower ends of the coil 71 is visible. Such a coil 71 is not cylindrical but rectangular as shown in FIG. This is because it fits in a tooth-like portion called a slot on the inner surface of the stator 70.

  However, even though it is rectangular, the corners are rounded. This is because the flat wire 50 cannot be completely bent at a pinpoint (this is not limited to a flat wire but a round wire). Here, in the conventional technique, the radius of curvature of the corner portion of the flat wire 50 is large. This is because the radius of curvature of the portion corresponding to the turn portion 19 is necessarily larger than the chamfered outermost circle (corresponding to the circle E in FIG. 3) of the portion corresponding to the shoulder portion 16. For this reason, as shown in FIG. 6, the protrusion amount D1 of the end portion of the coil 71 from the stator 70 is large. This means that the total extension of the flat wire 50 used for the coil 71 is long, which is disadvantageous in terms of motor weight and copper loss.

  On the other hand, according to the winding device 1 of the present embodiment, the coil 71 having a smaller radius of curvature than the conventional one can be manufactured. This is because the radius of curvature of the turn part 19 can be made smaller than the diameter of the shaft part 33 without being restricted by the conventional technique. For this reason, as shown in FIG. 7, the protrusion amount D2 from the stator 70 at the end of the coil 71 can be remarkably smaller than D1 in FIG. This means that the total extension of the flat wire 50 used in the coil 71 is short, which is advantageous in terms of the weight of the motor and copper loss.

  In addition, according to the winding device 1, in bending, the in-corner portion of the bent rectangular wire 50 does not become thicker than before bending. This is because the flat wire 50 to be bent is firmly sandwiched between the clamp surface 32 and the base surface 12. In this case, the stress concentration on the joint portion between the flange portion 31 and the shaft portion 33 in the clamp member 30 is alleviated by the connection portion 34 having a concave curved surface shape as described above.

  Here, in the winding device 1, the outermost circle of the concave curved surface shape of the connection portion 34 can have a considerably large diameter. As described above, there is no mutual restriction between the radius of curvature of the turn portion 19 and the outermost circle (the circle E in FIG. 3) of the chamfered shape of the shoulder portion 16. Therefore, even if the turn part 19 has a small diameter, the circle E can have a large diameter, and the concave curved surface shape of the connection portion 34 can also have a large diameter. For this reason, the effect of stress collection relaxation is greater, and the life of the winding device 1 is longer.

  As described in detail above, according to the present embodiment, the base member 10 in which the bending receiving portion 13 is integrated with the base portion 11 is used. For this reason, the bending receiving part 13 cannot rotate with respect to the base part 11. As a result, since the rotation of the bending receiving portion 13 during processing is eliminated, only the portion of a specific orientation in the bending receiving surface 14 which is the side surface of the bending receiving portion 13 is actually shortened by the rectangular wire 50 during processing. It can be used as a surface for receiving the side surface 53. That is the first straight part 17, the second straight part 18, and the turn part 19.

  Therefore, the curvature radius of the turn part 19 can be reduced without being restricted by the diameter of the hole part 15 or the like. On the other hand, the outer edge (circular E in FIG. 3) of the concave curved surface of the connection portion 34 of the clamp member 30 necessary for stress relaxation during processing is made large without being restricted by the curvature radius of the turn portion 19. be able to. As a result, the flat wire 50 is strongly bent into a post-processed shape with a small radius of curvature, and a large stress applied to the clamp member 30 at that time can be well dispersed. In this way, a long-life winding device 1 is realized that can be surely bent regardless of the curvature radius of the flat wire after bending.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, the specific shape of the bending receiving portion 13 can be modified. The bending receiving portion 13 in the above embodiment is formed in all directions around the hole portion 15 as shown in FIG. However, since it is sufficient for the bending receiving portion 13 to exist only in the first linear portion 17, the second linear portion 18, and the turn portion 19, the other portions may be at the same level as the base surface 12. . Further, as shown in FIG. 9 of Patent Document 1, the flat wire 50 can be slightly crushed in the thickness direction together with the bending process. The bending receiving portion 13 in that case may be equal to the thickness of the flat wire 50 after processing.

DESCRIPTION OF SYMBOLS 1 Winding apparatus 10 Base member 12 Base surface 13 Bending receiving part 17 1st linear part 18 2nd linear part 19 Turn part 30 Clamp member 32 Clamp surface 33 Shaft part 50 Flat wire 53 Short side surface

Claims (1)

In a rectangular wire winding device for winding a coil by bending a rectangular wire having a square cross section,
A foundation member having a foundation surface in contact with the bottom surface of the flat wire to be bent;
A clamp member for sandwiching a flat wire to be bent in the thickness direction together with the base surface;
A bend receiving member for receiving the inner surface of the flat wire to be bent;
The clamp member is
A columnar shaft,
And a clamp portion that contacts the upper and lower surfaces of the flat wire to be bent,
The bending receiving member is
At least a part of the side surface forms an inner surface defining portion that contacts the inner surface of the flat wire to be bent during bending.
A rectangular wire winding device characterized by being located on the side of the shaft portion and having a thickness equivalent to the thickness of the bent rectangular wire and being integrated with the base member .

Images