JP2018082543A - Coil welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil welding device capable of downsizing a stator manufacturing device and also reducing cost and a cycle time of manufacturing a stator.SOLUTION: A coil welding device 1 is adapted to include: a pedestal on which a stator core 10 is mounted; a both tip ends positioning unit 30 that relatively moves in a θ direction of the stator core 10 mounted on the pedestal to perform positioning of a radial position of a tip 88 of both ends in a R direction included in a plurality of sets of tip pairs 81 overlapped in the R direction; an inner end positioning unit 50 that relatively moves in a Z direction of the stator core 10 mounted on the pedestal, includes a projection 54 that is inserted between tip pairs 81 adjoining in the R direction to perform positioning of the tip 88 of both ends in contact with the projection 54 in the R direction; and a welding unit 70 that joins, by welding, two tips 88 of respective tip pairs 81 positioned in the R direction by the both tip ends positioning unit and the inner end positioning units 30, 50.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a coil welding apparatus used for joining segment conductors by welding to form a segment coil.

  Conventionally, as a method for manufacturing a stator, there is one described in Patent Document 1. In this manufacturing method, first, a stator core having an annular yoke and a plurality of teeth projecting radially from the yoke in the circumferential direction is prepared. Then, a substantially U-shaped segment conductor including a pair of substantially parallel straight portions is inserted into a slot provided between the teeth of the stator core so that both end sides of the segment conductor protrude in one axial direction of the stator core. .

  Subsequently, the tip of the protruding portion (leg portion) from the stator core in one straight portion of the segment conductor is fixed to the twisting device, and the portion other than the tip of the protruding portion is twisted in one circumferential direction, The tip of another segment conductor adjacent to the tip in the radial direction and the circumferential direction is fixed to the twisting device, and the portion other than the tip in the protruding portion including the tip is twisted to the opposite side in the circumferential direction. . And the tip part pair constituted by the two tip parts is overlapped when viewed from the radial direction. Here, since each tip is fixed to the twisting device, it is not twisted and is not deformed, and is still standing in the axial direction of the stator core even after the twisting is completed. Each tip is composed of a portion where a rectangular conductor wire having a rectangular cross section is covered with an insulating film, and a conductor exposed portion where the conductor wire is exposed at the tip of the portion. The

  After that, the jig is brought into contact with the tip on the inner peripheral side of the tip pair from the radially inner side to be plastically deformed radially outward, and the jig is brought into contact with the tip on the outer peripheral side of the tip pair from the radially outer side. It is made to plastically deform radially inward, and two tip parts are made to oppose via a predetermined gap in the diameter direction. Finally, the conductor exposed portions at the two tip portions that are opposed to each other in the radial direction via a predetermined gap are joined together by welding to produce a helical segment coil and attach it to the stator core.

JP 2006-131453 A

  In the conventional stator manufacturing method, the process of plastically deforming the two tip parts forming the pair of tip parts and adjusting the radial gap between the two tip parts to a predetermined gap is performed independently of the welding process. That is, the conventional stator manufacturing apparatus includes a dedicated device for the purpose of plastically deforming the two tip portions forming the pair of tip portions and adjusting the radial gap between the two tip portions to a predetermined gap. Therefore, the stator manufacturing apparatus becomes large-scale, the cycle time for manufacturing the stator becomes long, and the stator manufacturing cost increases.

  Therefore, an object of the present invention is to provide a coil welding apparatus that can reduce the size of the stator manufacturing apparatus and reduce the cost and cycle time of stator manufacturing.

  In the coil welding apparatus according to the present invention, a plurality of segment conductors mounted so as to be sequentially adjacent in the radial direction to teeth projecting inward in the radial direction from an annular stator core, one of the two different segment conductors. A pair of tip portions, each of which is composed of a tip end portion of the segment conductor and a tip end portion of the other segment conductor and protrudes to one side in the axial direction of the stator core, are adjacent to each other in the radial direction. A plurality of pairs of tip portions that overlap in the radial direction when the tip portion on the side is connected to the tip portion on the other side in the radial direction to form a spiral segment coil. A coil welding apparatus that welds and joins the plurality of pairs of tip portions each formed of the pair of tip portions at a time, wherein the stator core includes: An outer end in the radial direction among the front end portions included in the plurality of pairs of front end portions that move relative to a circumferential direction of the stator core placed on the base with respect to the base that is placed A plurality of sets of the plurality of sets, wherein the outer end tip portion is contacted from the outside in the radial direction and the outer end tip portion is pushed inward in the radial direction to position the radial position of the outer end tip portion. Of the tip portions included in the pair of tip portions, an inner end tip portion located at the radially inner end is brought into contact with the radially inner side to push the inner end tip portion outward in the radial direction. Both end tip positioning portions for positioning the radial position of the inner end tip portion, and the tip portion that moves relative to the pedestal in the axial direction of the stator core placed on the pedestal and is adjacent to the radial direction Having an insertion part inserted between the radial direction of the pair A radial position is determined by a middle tip positioner for positioning the tip positions of the tip portions on both sides where the insertion portion contacts in the radial direction, the tip end portion positioning portions, and the middle tip portion positioning portion. A welded portion that joins the two tip portions of the pair of tip portions that are positioned by welding.

  According to the coil welding apparatus according to the present invention, only by rotating the both end tip portion positioning portion relative to the stator core placed on the pedestal in the circumferential direction to a position overlapping the plurality of tip portion pairs in the radial direction, It is possible to position the radial positions of the tip portions located at both ends in the radial direction. Further, the radial position of the tip portions other than the tip portions at both ends of the plurality of pairs of tip portions can be positioned by merely moving the middle tip portion positioning portion relative to the stator core in the axial direction. And the conductor exposed part in the two front-end | tip parts which comprise each front-end | tip part pair can be joined by a welding part in the state in which several sets of front-end | tip part pairs are positioned. Therefore, compared with the case where the welding process is performed after the process of adjusting the radial gap between the two tip parts constituting each tip part pair to a predetermined gap by plastic deformation of a plurality of pairs of tip parts. Thus, the positioning of the plurality of pairs of tip portions and the welding of the two tip portions included in each pair of tip portions can be performed by a series of continuous operations. Positioning can be incorporated into the welding process. Therefore, the stator manufacturing apparatus can be downsized, and the stator manufacturing cost and cycle time can be reduced.

It is a model front view explaining operation | movement of the base of a coil welding apparatus. It is a perspective view of a part of a coil welding apparatus, and is a perspective view explaining the structure and operation of both end tip positioning parts, a middle tip positioning part, and a welding part. The both end tip positioning part and the middle tip part positioning part are schematic diagrams for explaining an example of the operation of positioning the radial positions of a plurality of tip part pairs. It is a schematic front view seen from the circumferential direction, and a schematic plan view when the both end tip portion positioning portion and the middle tip portion positioning portion are seen from above in the height direction. It is a model side view when the model front view of FIG. 3 is seen from the arrow B direction.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. In the following, when a plurality of embodiments and modifications are included, it is assumed from the beginning that a new embodiment is constructed by appropriately combining these characteristic portions. In the following description and drawings, the R direction represents the radial direction of the stator core 10, and the θ direction represents the circumferential direction of the stator core 10. The Z direction represents the height direction (axial direction) of the stator core 10. The R direction, the θ direction, and the Z direction are orthogonal to each other.

  The stator manufacturing apparatus including the coil welding apparatus 1 executes the insertion of the segment conductors and the twisting of both ends of the segment conductors in the same manner as the stator manufacturing apparatus described in Patent Document 1. Briefly, first, a stator core having an annular yoke and a plurality of teeth protruding in the radial direction at intervals from the yoke in the circumferential direction is prepared. Then, a substantially U-shaped segment conductor including a pair of substantially parallel straight portions is inserted into a slot provided between the teeth of the stator core so that both end sides of the segment conductor protrude in one axial direction of the stator core. .

  Subsequently, the tip of the protruding portion (leg portion) from the stator core in one straight portion of the segment conductor is fixed to the twisting device, and the portion other than the tip of the protruding portion is twisted in one circumferential direction, The tip of another segment conductor adjacent to the tip in the radial direction and the circumferential direction is fixed to the twisting device, and the portion other than the tip in the protruding portion including the tip is twisted to the opposite side in the circumferential direction. . And the tip part pair constituted by the two tip parts is overlapped when viewed from the radial direction. Here, since each tip is fixed to the twisting device, it is not twisted and is not deformed, and is still standing in the axial direction of the stator core even after the twisting is completed. Each tip is composed of a portion where a rectangular conductor wire having a rectangular cross section is covered with an insulating film, and a conductor exposed portion where the conductor wire is exposed at the tip of the portion. The In this way, a plurality of pairs of tip portions that are included in the plurality of segment conductors and overlap when viewed from the R direction of the stator core, each tip pair consisting of two tip portions that are adjacent in the radial direction. A pair of tip portions is formed.

  Thereafter, in the coil welding apparatus 1 described in detail below, positioning of all the tip portions included in the plurality of tip portion pairs in the R direction and two tips of each tip portion pair in which the R direction positions are positioned Joining of the exposed parts of the conductors by welding is performed.

  Hereinafter, the structure and operation of the coil welding apparatus 1 will be described with reference to FIGS. FIG. 1 is a schematic front view for explaining the operation of the pedestal 20 of the coil welding apparatus 1. FIG. 2 is a perspective view of a part of the coil welding apparatus 1 for explaining the structures and operations of the both end tip positioning part 30, the middle tip part positioning part 50, and the welding part 70. FIG.

  The coil welding apparatus 1 includes a pedestal 20 shown in FIG. 1, a both-ends tip portion positioning portion 30 shown in FIG. 2, a middle tip portion positioning portion 50 shown in FIG. 2, and a welding portion 70 shown in FIG. On the upper surface of 20, a stator core 10 on which a plurality of segment conductors are mounted is placed. As shown in FIG. 1, the coil welding apparatus 1 includes, for example, a servo motor 22 and an electric cylinder 23 in addition to a pedestal 20, and the electric cylinder 23 includes a housing 24 and a rod 25. The mounting surface of the housing 24 is fixed on a horizontal plane 27, and a servo motor and a ball screw (not shown) are built in the housing 24, for example. By rotating the ball screw by the servo motor, the ball screw advances and retreats with respect to a nut (not shown) fixed to the housing 24, and the rod 25 connected to the tip of the ball screw is in the Z direction indicated by the arrow A (this embodiment). Moves vertically on both sides.

  The lower surface of the servo motor 22 is fixed to the tip of the rod 25, and the lower side of the pedestal 20 is fixed to the output shaft (not shown) of the servo motor 22. The output shaft of the servo motor 22 extends in the Z direction and rotates in the θ direction. As will be described later, the servo motor 22 is intermittently driven, and the output shaft of the servo motor 22 alternately repeats rotation for a predetermined time and stop for a predetermined time.

  The stator core 10 on which the plurality of segment conductors are mounted is held by a holding portion (not shown) on the pedestal 20 and is held at a predetermined position on the upper surface of the pedestal 20 so as not to be relatively movable with respect to the pedestal 20. The axis center of the output shaft of the servo motor 22 and the center axis of the stator core 10 held by the holding portion are located on substantially the same straight line. When the rod 25 moves up and down in the Z direction indicated by the arrow A, the stator core 10 held on the upper surface of the base 20 moves up and down in the Z direction. Further, when the output shaft of the servo motor 22 rotates in the θ direction, the stator core 10 rotates in the θ direction around the central axis.

  As shown in FIG. 2, the coil welding apparatus 1 includes both end tip portion positioning portions 30, a middle tip portion positioning portion 50, and a welding portion 70, and both end tip portion positioning portions 30 include a pair of outer rotating rollers 31 and The inner front end portion positioning unit 50 includes an inner rotation roller 32 and is composed of a comb-like member 51. In addition, the welded portion 70 includes a pair of first and second electrodes 71 and 72.

  The outer and inner rotating rollers 31 and 32 face each other with an interval in the R direction of the stator core 10 held by the pedestal 20. The outer and inner rotating rollers 31 and 32 are rotatably attached to fixed positions of the coil welding apparatus 1. For example, each of the outer and inner rotary rollers 31 and 32 is attached to a cylindrical shaft portion extending in the Z direction in the coil welding apparatus 1 via a bearing.

  In the example shown in FIG. 2, when the stator core 10 to which the plurality of segment conductors 83 after the twisting process is attached is viewed from the R direction, the four tip end pairs 81 are disposed so as to overlap. The segment conductor 83 has a structure in which portions other than both sides of a conductor wire 94 having a rectangular shape with a rectangular cross section are covered with an insulating film 95. Further, as described above, each tip 88 includes a portion where the conductor wire 94 is covered with the insulating film 95, and a conductor exposed portion 96 on the tip side of the portion where the conductor wire 94 is exposed. Consists of. The distance between the outer rotating roller 31 and the inner rotating roller 32 in the R direction is the outer end portion positioned at the outer end in the R direction by the four tip pair 81 and the inner end positioned at the inner end in the R direction by the four tip pair 81. It is shorter than the distance in the R direction with the end portion.

  As a result, the output shaft of the servo motor 22 rotates, the four tip pair 81 moves relative to the outer and inner rotating rollers 31 and 32 in the θ direction, and the four tip pair 81 moves in the θ direction. When moving to the same phase position as the outer and inner rotating rollers 31 and 32, the outer end tip 86 located at the outer end in the R direction is pushed inward in the R direction by the outer rotating roller 31 from the outer side in the R direction and moved inward in the R direction. And the radial position of the outer end tip portion 86 is positioned. Similarly, when the four tip pair 81 moves to the same phase as the outer and inner rotary rollers 31 and 32 in the θ direction, the inner end tip 87 located at the inner end in the R direction is moved from the inner side in the R direction. The inner rotating roller 32 is pushed outward in the R direction to move outward in the R direction, and the radial position of the inner end tip 87 is positioned. When the servo motor 22 (see FIG. 1) is intermittently driven and the four tip pair 81 moves to a position overlapping the outer and inner rotating rollers 31 and 32 when viewed from the R direction, the base 20 (see FIG. 1). ) Is temporarily stopped. After that, the pedestal 20 is raised in the Z direction to a predetermined upper position by driving the electric cylinder 23.

  The comb-shaped member 51 has a bolt insertion hole 52 and is fixed to a fixed frame (not shown) with a bolt (not shown) inserted through the bolt insertion hole 52. The comb-like member 51 has a base 53 extending in one direction and three protrusions (parts corresponding to comb teeth) 54 spaced from each other in the one direction. The base portion 53 extends in a direction substantially orthogonal to the extending direction. In a state where the comb-like member 51 is attached to the fixed frame, the base 53 extends in the substantially R direction, and the three protruding portions 54 extend in the approximately θ direction. In FIG. 2, the illustration of the two tip portions 88 existing in front of the protruding portion 54 is omitted so that the protruding portion 54 can be easily seen.

  As shown in FIG. 2, in a state where the pedestal 20 is located at the upper position, the three protrusions 54 are inserted into the R-direction gap between the tip end pairs 81 generated by three in the four tip end pair 81, The protrusions 54 come into contact with the tip portions 88 on both sides thereof, so that the R-direction gap is expanded. Accordingly, the R-direction positions of the six tip portions 88 that are in contact with the three protrusions 54 are positioned. Each protrusion 54 constitutes an insertion portion of the middle tip portion positioning portion. The six tip end portions 88 whose positions in the R direction are positioned by the comb-like member 51 are the tip ends of the eight tip end portions 88 constituting the four tip end portion pairs 81 excluding the outer end and inner end tip portions 86 and 87. Part 88 is configured. Therefore, the R-direction positions of the four tip pair 81 are positioned by the pair of outer and inner rotating rollers 31 and 32 and the comb-like member 51. Although not shown, in a state where the pedestal 20 holding the stator core 10 on the upper surface is moved to the lowermost position, the distal end portion 88 is positioned below the comb-shaped member 51 in the Z direction.

  The pair of first and second electrodes 71 and 72 are disposed at a fixed height position above the comb-like member 51. The first electrode 71 is fixed to the fixed frame and cannot move, while the second electrode 72 moves in the R direction and the θ direction at the same height position as the first electrode 71. Although not described in detail, for example, the second electrode 72 rotates in the θ direction based on rotation of a servo motor (not shown), and moves in the R direction based on driving of an electric cylinder (not shown).

  The first electrode 71 has a recess 91 that opens to one side in the θ direction in the R direction range in which the four tip portion pairs 81 exist, and the second electrode 72 has an R direction range in which the four tip portion pairs 81 exist. Has a recess 92 that opens to the other side in the θ direction. When performing welding, the concave portion 91 and the concave portion 92 are opposed to each other in the θ direction and define a through-hole surrounding the four tip portion pairs 81 together.

  The first electrode 71 has three stoppers 97 protruding from the bottom of the recess 91 to one side in the θ direction, and the second electrode 72 has three stoppers (not shown) protruding from the bottom of the recess 92 to the other side in the θ direction. )). In the present embodiment, the three stoppers of the second electrode 72 are located below the three stoppers 97 in the Z direction and are not visible in FIG. Each of the three stoppers of the first and second electrodes may protrude in the θ direction from any height of the recess.

  The first and second electrodes 71 and 72 clamp the four tip portion pairs 81 in the following procedure. First, the pedestal 20 (see FIG. 1) is moved to the upper position, and the second and second rotation rollers 31 and 32 and the comb-shaped member 51 are positioned in the radial positions of the four tip portion pairs 81. The electrode 72 moves to the other side in the θ direction indicated by the arrow α to a position facing the first electrode 71 in the θ direction, and the four paired tip portions 81 are held in the θ direction. Thereafter, when the second electrode 72 moves inward in the R direction indicated by the arrow β, the inner side in the R direction of each pair of tip portions 81 is either the wall portion on the inner side in the R direction of the recess 91 or the stopper of the first electrode 71. 97, the R direction outer side of each tip pair 81 comes into contact with the wall portion on the R direction outer side of the recess 92 or the stopper of the second electrode 72.

  As a result, each tip pair 81 is sandwiched between the first electrode 71 and the second electrode 72 in the R direction and held in the R direction. A voltage is applied between the first electrode 71 and the second electrode 72 in a state in which each tip pair 81 is held in the θ direction and the R direction by the first electrode 71 and the second electrode 72, and in the R direction. In the four tip portion pairs 81 that overlap, the two tip portions 88 constituting each tip portion pair 81 are joined at a time by TIG welding (TIG welding).

  When the two tip portions 88 that constitute each tip portion pair 81 are joined by welding in the four tip portion pairs 81 that overlap in the R direction, the second electrode 72 has four tip portion pairs 81 that overlap in the next R direction. Retreat to perform welding. Specifically, the second electrode 72 moves outward in the R direction in a direction opposite to the direction indicated by the arrow β, and then moves to one side in the θ direction in the direction opposite to the direction indicated by the arrow α. 71 and away from the four welded tip pairs 81. Thereafter, the pedestal 20 moves downward in the Z direction, and then the θ direction until the four front end pair 81 before the next welding overlap with the outer and inner rotating rollers 31 and 32 when viewed from the R direction. Rotate to rest. Thereafter, the pedestal 20 is raised in the Z direction, and the second electrode pair 81 is positioned in the R direction by the outer and inner rotary rollers 31 and 32 and the comb-shaped member 51 before the welding is performed. After 72 moves to the other side in the θ direction indicated by arrow α, it moves inward in the R direction indicated by arrow β, and then TIG welding is performed. This series of operations is repeated until all the tip pairs 81 are welded. With this operation, the segment coil is manufactured and the segment coil is attached to the stator core 10.

  A plurality of segment conductors 83 constituting the same segment coil are inserted into the same slot separated in the θ direction across several slots. In addition, the protruding portions (leg portions) of the two segment conductors 83 arranged at both ends in the R direction of the stator core 10 in each segment coil are in the same phase (U phase, V phase, W phase) adjacent in the θ direction It is bent to the segment coil side of the same phase. And the front-end | tip part 88 of the protrusion part of the two segment conductors 83 arrange | positioned in an R direction edge part in the adjacent in-phase segment coil is joined by welding. In this way, a coil body (U-phase coil body, V-phase coil body, W-phase coil body) in which a plurality of in-phase segment coils are electrically connected is configured. Each phase coil body is configured, for example, by connecting in series a first coupling coil body arranged so as to go around in the θ direction and a second coupling coil body arranged so as to go around in the θ direction. Is done. For example, a protrusion disposed at one end of each phase coil body is bent into a crank shape to form a lead wire. The lead wire for each phase is electrically connected to a power line (not shown) on the power supply side. FIG. 2 shows a lead wire 77U for the U-phase coil body and a lead wire 77W for the W-phase coil body. On the other hand, for example, a protrusion disposed at the other end of the U-phase coil body and a protrusion disposed at the other end of the V-phase coil body are electrically connected by a first neutral wire (not shown). The protrusion disposed at the other end of the V-phase coil body and the protrusion disposed at the other end of the W-phase coil body are electrically connected by a second neutral wire (not shown). . The Y connection is configured by electrical connection using the first and second neutral wires. The first and second neutral lines can be arranged, for example, on the outer side in the R direction of the four pairs of tip portions 81 and on the side opposite to the side where the four pairs of tip portions 81 exist in the Z direction. It can also be arranged.

  FIG. 3 is a schematic diagram illustrating an example of an operation in which the both-end tip portion positioning unit 30 and the middle-side tip portion positioning unit 50 position the R-direction positions of the plurality of tip portion pairs 81. And the schematic front view (FIG. 3 (a1), FIG.3 (b1), FIG.3 (c1)) which looked the middle side front-end | tip part positioning part 50 from the circumferential direction, both-ends front-end | tip part positioning part 30, and middle side front-end | tip part positioning part It is a schematic plan view (FIG. 3 (a2), FIG.3 (b2), FIG.3 (c2)) when 50 is seen from the height direction upper part. 4 is a schematic side view of the schematic front view (FIG. 3 (a2), FIG. 3 (b2), FIG. 3 (c2)) of FIG. In FIG. 3A2 and FIG. 3B2, the protruding portion 54 is not shown in order to make the arrangement of the tip end portion 88 easier to see.

  Referring to FIGS. 3 (a1) and 3 (a2), before the outer end and inner end tips 86, 87 contact the outer and inner rotating rollers 31, 32, the outer rotating roller 31 faces inward in the R direction. The inner portion located is located in the same range in the R direction as the outer portion located outside in the R direction at the outer end tip 86, and the outer portion located outside in the R direction on the inner rotating roller 32 is the inner end tip 87. In the R direction and the same range in the R direction.

  Therefore, as shown in FIGS. 3 (b1) and 3 (b2), when the pedestal 20 moves in the θ direction to the position where the four tip pair 81 overlaps the outer and inner rotating rollers 31 and 32 in the R direction, The outer end tip 86 is pushed inward in the R direction by the outer rotating roller 31. As a result, as shown in the region R <b> 1, the insulating coatings 95 of the two distal end portions 88 constituting the distal end portion pair 81 located at the outer end in the R direction are in contact with each other, and the two conductor exposed portions 96 of the distal end portion pair 81 are in contact with each other. However, they face each other through a gap in the R direction that is about twice the thickness of the insulating coating 95. At the same time, the inner end tip 87 is pushed outward in the R direction by the inner rotary roller 32, and as shown in the region R2, the insulating coatings 95 of the tip pair 81 positioned at the inner end in the R direction come into contact with each other. The two exposed conductors 96 constituting the tip pair 81 are opposed to each other through a gap in the R direction that is about twice the thickness of the insulating coating 95. In this manner, the radial positions of the two tip portion pairs 81 positioned at the outer end and the inner end in the R direction are positioned.

  Thereafter, when the pedestal 20 is moved upward in the Z direction to an upper position, as shown in FIGS. 3 (c1) and 3 (c2), the protrusion 54 is located in the gap in the R direction between the tip pair 81 adjacent in the R direction. As shown in the region R <b> 3, the insulating coatings 95 of the two distal end portions 88 that make up the distal end portion pair 81 come into contact with each other at the two distal end pair 81 on the middle side. In this way, the R direction positions of the two tip pair 81 on the middle side in the R direction are positioned.

  As shown in FIGS. 3 (a1), 3 (a2), and 4 (a), the outer ends and inner end tips 86, 87 at both ends in the R direction are pushed in the R direction by the outer and inner rotating rollers 31, 32. The outer and inner rotary rollers 31 and 32 receive force from the insulating coating 95 and rotate in the directions of arrows C1 and C2. 3 (c1), FIG. 3 (c2), and FIG. 4 (c), the outer and inner rotating rollers 31 and 32 press the outer end and inner end tip portions 86 and 87. The protruding portion 54 is inserted between the pair of tip portions 81 adjacent in the R direction.

  According to the above embodiment, the both-ends tip positioning part 30 is simply rotated in the θ direction relative to the stator core 10 placed on the pedestal 20 until it overlaps the plurality of sets of tip part pairs 81 in the R direction. The R direction positions of the outer end and inner end tip portions 86 and 87 located at both ends in the θ direction can be positioned. Further, by merely moving the middle tip portion positioning portion 50 relative to the stator core 10 in the Z direction, tip portions 88 other than the outer end and inner end tip portions 86 and 87 among the plurality of tip portion pairs 81 are provided. The R direction position can also be positioned. Then, the conductor exposed portions 96 at the two tip portions 88 and 88 constituting each tip portion pair 81 can be joined by the welded portion 70 in a state where the plural pairs of tip portions 81 are positioned. Therefore, compared with the case where the welding process is performed after the process of adjusting the radial gap between the two tip parts constituting each tip part pair to a predetermined gap by plastic deformation of a plurality of pairs of tip parts. Thus, positioning of the plurality of pairs of tip portions 81 in the R direction and welding of the two tip portions 88 included in each pair of tip portions 81 can be executed by a series of continuous operations. The positioning in the R direction can be incorporated into the welding process. Therefore, the stator manufacturing apparatus can be downsized, and the stator manufacturing cost and cycle time can be reduced.

  Further, both end tip positioning portions 30 include outer and inner rotating rollers 31, 32, and the outer and inner rotating rollers 31, 32 receive force from the outer end and inner end leading ends 86, 87 in the directions of arrows C1, C2. Therefore, the outer end and inner end tip portions 86 and 87 are not easily damaged by contact with the both end tip portion positioning portions 30.

  The present invention is not limited to the above-described embodiment and its modifications, and various improvements and modifications can be made within the matters described in the claims of the present application and their equivalent ranges.

  For example, in the above-described embodiment, the case where the outer and inner rotating rollers 31 and 32 of the both end tip positioning portions 30 press the outer end and inner end tip portions 86 and 87 in the R direction has been described. However, both end tip positioning portions 30 have a convex curved surface on the inner side in the R direction and cannot rotate, and an outer tip positioning portion that has a convex curved surface on the outer side in the R direction and cannot rotate. And a positioning part. Then, the outer end tip portion may be pressed inward in the R direction by the curved surface of the outer tip portion positioning portion, and the inner end tip portion may be pressed outward in the R direction by the curved surface of the inner tip portion positioning portion. In this case, it is preferable that the curved surface is mirror-finished because the segment operation is hardly damaged.

  Moreover, although the case where the pedestal 20 moves in the θ direction with respect to the both-ends tip positioning unit 30 has been described, the both-ends tip positioning unit may move in the θ direction with respect to the stationary pedestal. Good. In addition, the case where the pedestal 20 moves up and down in the Z direction with respect to the stationary front end positioning portion 50 has been described. However, the pedestal 20 moves up and down in the Z direction with respect to the stationary base. You may move. Moreover, although the case where the four tip end pairs 81 overlap in the R direction and the comb-like member 51 has the three comb-like protrusions 54 has been described, a plurality of tip end pairs other than four overlap in the R direction. Alternatively, the comb-shaped member may have a plurality of comb-shaped protrusions other than three. Moreover, although the case where the base 20 and the 2nd electrode 72 moved on the straight line with the electric cylinder was demonstrated, the base and the 2nd electrode move on the straight line by other mechanisms, for example, a hydraulic cylinder, a rack and pinion mechanism, etc. May be. Moreover, although the case where the Z direction coincides with the vertical direction has been described, the Z direction may not coincide with the vertical direction.

  DESCRIPTION OF SYMBOLS 1 Coil welding apparatus, 10 Stator core, 20 base, 30 Both ends tip positioning part, 50 Middle tip positioning part, 54 Projection part, 70 Welding part, 81 Tip part pair, 83 Segment conductor, 86 Outer end tip part, 87 Inner end tip, 88 Tip, Z direction Stator core height direction (axial direction), R direction Stator core radial direction, θ direction Stator core circumferential direction.

Claims (1)

A plurality of segment conductors mounted so as to be sequentially adjacent in the radial direction to teeth projecting inward in the radial direction from the annular stator core, the tip end portion of one of the two segment conductors and the other of the segment conductors A pair of tip portions that are adjacent to each other in the radial direction and project to one side in the axial direction of the stator core, and the tip portion on one side in the radial direction is the radial direction. When a spiral segment coil is formed by joining to the tip portion on the other side, a plurality of tip portion pairs overlapping in the radial direction, each tip portion pair being the pair of tip ends A coil welding apparatus that welds and joins the plurality of pairs of tip portions configured at one portion at a time,
A pedestal on which the stator core is placed;
An outer end tip that moves relative to the pedestal in the circumferential direction of the stator core placed on the pedestal and is positioned at the outer end in the radial direction among the tip portions included in the plurality of pairs of tip portions. The outer end tip portion is brought into contact with the outer portion in the radial direction and the outer end tip portion is pushed inward in the radial direction to position the radial position of the outer end tip portion, and is included in the plural pairs of tip portions. Among the tip portions, an inner end tip portion located at the radially inner end is contacted from the inside in the radial direction and the inner end tip portion is pushed outward in the radial direction to Both-ends tip positioning part for positioning the radial position;
An insertion portion that moves relative to the pedestal in the axial direction of the stator core mounted on the pedestal and is inserted between the radial directions of the pair of tip portions adjacent in the radial direction; A middle tip portion positioning portion for positioning the radial position of the tip portion on both sides where the insertion portion contacts in the radial direction;
A welding part that joins the two tip parts of each pair of tip parts that are positioned by a radial position by the tip part positioning part and the middle tip part positioning part by welding;
A coil welding apparatus comprising:

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