Welding method and jig

Abstract

The present invention provides a welding method which makes it possible to suppress variations in welding inside an assembly. Provided is a welding method in which welding is performed with a conductive wire 15 and a terminal 17 inside an assembly 1 brought into contact with each other, wherein a jig 19 which is operable from the outside of the assembly 1 is driven to cause a contact between the conductive wire 15 and the terminal 17. By managing this drive force of the jig 19, welding is performed with a predetermined pressing force applied between the conductive wire 15 and the terminal 17.

Description

Technical Field

[0001] The present invention relates to a welding method and a jig used for a stator of a rotating electric machine or the like.

Background Art

[0002] As a conventional welding method, there is one described in Patent Document 1. In this welding method, a bus bar of a stator of a rotating electric machine has a conductive wire connection part as a terminal, and for example, two conductive wires of a coil are held by caulking a side wall part bent so as to surround the conductive wire connection part. In this held state, the conductive wire connection part and the conductive wire are joined by arc welding.

[0003] In the welding method described in Patent Document 1, variations in the contact area and contact pressure between the conductive wire and the conductive wire connection part may occur due to variations in accuracy such as various dimensions and caulking processes.

[0004] Generally, in welding, when the contact area and contact pressure between two members are wide and strong, heat conduction is good. That is, melting of a portion with good heat conduction between the two members preferentially starts by welding. Therefore, when there are variations in the contact area and contact pressure between the electric wire and the conductive wire connection part, for example, a portion with weak contact pressure ends with insufficient melting, and variations in welding are likely to occur.

[0005] On the other hand, if the welding time is lengthened, it is possible to sufficiently melt all of the welded part. However, inside an assembly such as a stator, there are conductive wires, insulating coatings of coils, and surrounding resin materials around the welded part, and there is a limit to the welding time from the viewpoint of heat resistance.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] The problem we are trying to solve is that it easily leads to variations in welding within the assembly. [Means for solving the problem]

[0008] The present invention provides a welding method for welding a conductive wire of a coil inside an assembly to a terminal of a busbar by bringing them into contact with each other. In this welding method, a jig is driven from outside the assembly to bring one of the conductive wires of the coil and the terminal of the busbar into contact with the other conductive wire of the coil and the terminal of the busbar by the pressing force of the jig. Contact between the conductive wire and the terminal is made by pressing the conductive wire with the jig at a position offset in the axial direction of the conductive wire from the contact portion between the conductive wire and the terminal. The welding is performed while controlling the driving force of the jig to keep the pressing force within a specified range.

[0009] Furthermore, the present invention provides a jig for use in the welding method described above. The jig comprises a base member that supports the assembly, a movable body that is movable relative to the base member, a pressing part provided on the movable body that directs the other of the conductive wire of the coil and the terminal of the busbar to one of the conductive wires of the coil and the terminal of the busbar, sandwiching the other, and a drive unit that moves the movable body to bring the other of the conductive wires of the coil and the terminal of the busbar into contact with the one of the conductive wires of the coil and the terminal of the busbar by the pressing force of the pressing part. The drive unit makes it possible to set the pressing force within a specified range by controlling the driving force of the movable body. [Effects of the Invention]

[0010] This invention can suppress variations in welding within an assembly. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a perspective view of a stator relating to an embodiment. [Figure 2] Figure 2 is a perspective view showing the jig supporting the stator in Figure 1. [Figure 3] Figure 3 is an exploded perspective view showing the stator and jig from Figure 1. [Figure 4] Figure 4 is a cross-sectional view showing the jig of Figure 2. [Figure 5] Figure 5 is an enlarged plan view of a part of the jig of Figure 2. [Figure 6] Figure 6 is an enlarged cross-sectional view of a part of the jig of Figure 2. [Figure 7] Figure 7 is an enlarged plan view of a part of Figure 5.

Mode for Carrying Out the Invention

[0012] The object of suppressing the variation in welding inside the assembly is achieved by bringing the conductive wire of the coil and the terminal of the bus bar to be welded by the jig into contact with a prescribed pressing force. [[ID=二十]]

[0013] The welding method is to weld by bringing the conductive wire 15 of the coil 7 inside the assembly 1 and the terminal 17 of the bus bar 9 into contact with each other. In this welding method, the jig 19 is driven from the outside of the assembly 1, and the other 15 of the conductive wire 15 and the terminal 17 is brought into contact with one 17 of the conductive wire 15 and the terminal 17 by the pressing force of the jig 19. By controlling the driving force of this jig 19, welding is performed while keeping the pressing force within a prescribed range.

[0014] The conductive wire 15 and the terminal 17 inside the assembly 1 where welding is performed can be the conductive wire and the terminal of the bus bar of a rotating electric machine or a power electronics device.

[0015] In one embodiment, the assembly 1 is an assembly used for a rotating electric machine.

[0016] The pressing of the conductive wire 15 is performed at a position shifted in the axial direction of the conductive wire 15 rather than at the contact portion between the conductive wire 15 and the terminal 17, and the conductive wire 15 may be brought into contact with the terminal 17.

[0017] The edge of the terminal 17 may be provided with an edge recess 17a for positioning the conductive wire 15. In this case, the conductive wire 15 contacts the terminal 17 at the edge recess 17a.

[0018] The number of conductive wires 15 welded to terminal 17 is not particularly limited. As one embodiment, at least two conductive wires 15 may be arranged in parallel and contact terminal 17 with a specified pressing force.

[0019] The jig 19 used in such a welding method includes a base member 21, a movable body 23, a pressing portion 25, and a driving portion 27. The base member 21 supports the assembly 1. The movable body 23 is provided so as to be movable with respect to the base member. The pressing portion 25 is provided on the movable body 23 and is directed to sandwich and press one of the conductive wire 15 and the terminal 17 against the other of the conductive wire 15 and the terminal 17. The driving portion 27 moves the movable body 23 to bring the other of the conductive wire 15 and the terminal 17 into contact with one of the conductive wire 15 and the terminal 17 by the pressing force of the pressing portion 25. And the driving portion 27 can make the pressing force within a specified range by managing the driving force of the movable body 23.

[0020] The pressing portion 25 can adopt an appropriate shape. As one embodiment, it may be provided with a concave pressing surface 53c for the conductive wire 15.

[0021] Also, the pressing portion 25 may be integrated with or separate from the movable body 23, but may be configured separately and supported by the movable body 23 so as to be replaceable.

[0022] The movable body 23 may include a slide portion 45 and a pressing force transmission portion 47. The slide portion 45 moves along the base member 21 in conjunction with the driving portion 27. The pressing force transmission portion 47 is integrally provided on the slide portion 45 and is coupled to the pressing portion 25.

[0023] In one embodiment, the driving portion 27 may include a driving bolt 49. The driving bolt 49 penetrates the base member 21 in the radial direction and has an inner portion in the radial direction that is screwed into the movable body 23 and an outer portion in the radial direction that protrudes from the base member 21 and can be axially rotated.

[0024] The base member 21 may be provided with a cover 37 via a stud portion 35. The stud portion 35 is erected on the base member 21, and the cover 37 covers the coil 7 and the busbar 9. The cover 37 is provided with a work window 41 that exposes the terminals 17 and the conductive wires 15. [Examples]

[0025] [Stator] Figure 1 is a perspective view of an example of a stator.

[0026] The stator 1 in Figure 1, together with the rotor (not shown), constitutes a rotating electric machine. This rotating electric machine is configured, for example, as a three-phase (U-phase, V-phase, W-phase) AC motor. In the following description, radial, circumferential, and axial directions refer to the radial, circumferential, and axial directions of the stator 1.

[0027] The stator 1 comprises a stator core 3, an insulator 5, a coil 7, a busbar 9, etc. This stator 1 is an example of the assembly in this embodiment, and other configurations can be adopted. Furthermore, the assembly is not limited to the stator 1, which is an assembly of a rotating electric machine, but can also be power electronics equipment, etc.

[0028] The stator core 3 is constructed, for example, by laminating multiple annular electromagnetic steel sheets. This stator core 3 has a yoke 11 and teeth 13 and is covered with an insulator 5 as described above. A conductive wire 15 covered with an insulating film is wound around each tooth 13, and the wound conductive wire 15 forms a coil 7. The conductive wire 15 in this embodiment has a circular cross-section.

[0029] The busbar 9 is a conductive component for supplying three-phase drive current to the coil 7. Each phase busbar 9 is routed appropriately from the connector 18 over the insulator 5 and connected to the coil 7. For this reason, the busbar 9 is provided with terminals 17 for connection to the coil 7.

[0030] Terminal 17 extends radially inward from the busbar 9 and is a plate-shaped projection with width in the circumferential direction. The radially inward edge of this terminal 17 is joined to the end portion of the conductive wire 15 of the coil 7 by a weld W (see Figure 7). Each end of the busbar 9 is arranged within the connector 18 as three-phase connector terminals 18a, 18b, and 18c.

[0031] [Welding Method] The welding method in this embodiment involves welding the conductive wire 15 of the coil 7 of the starter 1 to the terminal 17 of the busbar 9. During this welding, the conductive wire 15 is brought into contact with the terminal 17 using a jig 19.

[0032] Figure 2 is a perspective view showing the jig 19 supporting the stator 1 in Figure 1. Figure 3 is an exploded perspective view of the stator 1 and jig 19 in Figure 2, with the cover 37 omitted. Figure 4 is a cross-sectional view of the jig 19 in Figure 2. Figure 5 is an enlarged plan view showing a part of the jig 19 in Figure 2 with the cover 37 omitted.

[0033] As shown in Figures 2 to 5, the jig 19 used in the welding method of this embodiment constitutes a jig that can be driven from outside the stator 1. This jig 19, when driven, brings the conductive wires 15 of the coil 7 into contact with the terminals 17 of the busbar 9 by pressing force, and controls the driving force to keep the pressing force within a specified range. In this embodiment, the jig 19 comprises a base member 21, a movable body 23, a pressing part 25, and a drive part 27.

[0034] The base member 21 supports the stator 1 on one side in the axial direction. In this embodiment, the base member 21 is formed in a plate shape and has a hexagonal planar shape. However, the shape of the base member 21 is not particularly limited. A recess 29 is formed in the center of the base member 21. The recess 29 is concave in the thickness direction of the base member 21 and is open at the top. Here, "top" refers to the top in the figure and is not necessarily in the vertical direction.

[0035] In this embodiment, the thickness direction of the base member 21 coincides with the axial direction of the stator 1. Also, the central part of the base member 21 is the portion excluding the outer periphery of the base member 21. The planar shape of the recess 29 is not particularly limited, but in this embodiment it is circular.

[0036] In the central part of the recess 29, excluding the outer periphery, a core metal 33 is positioned via a spacer 31. The outer periphery of the recess 29 is a circumferential portion surrounding the spacer 31. Multiple groove-shaped recesses 34 are formed on the outer periphery of the recess 29. Each groove-shaped recess 34, like the recess 29, is concave in the thickness direction of the base member 21 and is open at the top. In a plan view, these groove-shaped recesses 34 are grooves that extend radially outward from the wall portion that defines the recess 29. The multiple groove-shaped recesses 34 are arranged at intervals in the circumferential direction.

[0037] The circumferential width of the groove-shaped recess 34 corresponds to the width of the sliding portion 45 of the movable body 23. The depth of the groove-shaped recess 34 is the same as the depth of the recess 29. A through hole 21a formed in the base member 21 communicates radially with this groove-shaped recess 34. The through hole 21a penetrates radially from the radial outer surface of the base member 21 to the groove-shaped recess 34.

[0038] Stud bosses 35 are erected on the base member 21 as stud sections. The location and number of stud bosses 35 are not particularly limited, but in this embodiment, six stud bosses 35 are arranged corresponding to the corners of the planar shape of the base member 21.

[0039] The stud boss 35 supports a cover 37 at its tip, which covers the coil 5 and busbar 9. The cover 37 has through holes (not shown) corresponding to the stud boss 35. Bolts 39 are fastened through each through hole to female threads (not shown) on the stud boss 35. These bolts 39 are used to attach and detach the cover 37.

[0040] The stud portion only needs to be columnar in shape to support the cover 37, and may be configured by attaching a stud bolt to the stud boss 35. In this case, a nut is used instead of the bolt 39. Also, if the cover 37 can be fixed in place, bolts and nuts may not be used.

[0041] The cover 37 is formed in a plate-like shape, or in this embodiment, a disc-like shape, that covers the coil 7 and the busbar 9. However, the planar shape of the cover 37 is not particularly limited. The cover 37 is provided with a work window 41 for exposing the terminals 17 and conductive wires 15, and a notch 43 for a connector.

[0042] In this embodiment, there are six work windows 41. The work windows 41 have a cross-sectional shape that widens in the thickness direction from the terminal 17 and conductive wire 15 side toward the outer surface of the cover 37. The cross-sectional shape of the work windows 41 is not particularly limited, but in this embodiment, the work windows 41 widen in a stepped shape.

[0043] The cover 37 is intended to suppress the effects of heat during welding on the stator 1, but it can be omitted.

[0044] The movable body 23 is mounted so as to be movable relative to the base member 21. In this embodiment, the movable body 23 is mounted on the base member 21. However, the movable body 23 only needs to be configured to be movable relative to the base member 21, and does not need to be mounted on the base member 21.

[0045] The movable bodies 23 are each positioned along the groove-shaped recesses 34 and are movable in the radial direction. However, the direction of movement of the movable bodies 23 is appropriately set according to the contact direction between the conductive wires 15 of the coil 7 and the terminals 17 of the busbar 9.

[0046] In this embodiment, the movable body 23 is equipped with a sliding portion 45 and a pressing force transmission portion 47.

[0047] The sliding portion 45 moves along the base member 21 in conjunction with the drive unit 27. The base portion 45a of the sliding portion 45 is formed to be relatively wider on the radially outer side.

[0048] The circumferential width of the base portion 45a corresponds to the width of the groove-shaped recess 34. The base portion 45a fits into the groove-shaped recess 34 and is guided along the groove-shaped recess 34. The radially inward tip portion 45b of the sliding portion 45 protrudes toward the spacer 31 and is located below the bottom surface of the core metal 33. Therefore, the radial movement of the sliding portion 45 can be made stable.

[0049] The pressing force transmission section 47 is formed in a columnar shape and rises axially from the sliding section 45. A gradient section 47a is formed between the pressing force transmission section 47 and the sliding section 45. This pressing force transmission section 47 supports the pressing section 25, which is mounted on the movable body 23.

[0050] In a plan view, the pressing portion 25 is directed radially inward with respect to the terminal 17, with the conductive wire 15 in between. In this embodiment, the pressing portion 25 is supported at the tip of the pressing force transmission portion 45. However, the pressing portion 25 may also be supported at an intermediate portion in the axial direction of the pressing force transmission portion 45.

[0051] The pressing portion 25 is in relative-movable contact with the lower surface of the cover 37. However, the pressing portion 25 can also be separated from the lower surface of the cover 37. Details of the pressing portion 25 will be described later.

[0052] The drive unit 27 is linked to the movable body 23 and moves the movable body 23. This movement of the movable body 23 causes the pressing unit 25 to press the conductive wire 15 against the terminal 17, causing it to make contact.

[0053] In this embodiment, the drive unit 27 is configured with a plurality of drive bolts 49. Each drive bolt 49 penetrates the base member 21 radially through an insertion hole 21a. The drive bolt 49 has a radially inner portion that penetrates the base member 21 radially inward and outward and is screwed into the movable body 23, and a radially outer portion that protrudes from the base member 21 so as to be rotatable.

[0054] In this embodiment, the radially outer portion of the drive bolt 49 is provided with a head portion 49a, which is positioned to protrude radially outward from the base member 21. A washer 51 is interposed between the head portion 49a and the outer surface of the base member 21. The head portion 49a can be rotated axially by a tool or device.

[0055] Therefore, the drive unit 27 can move the movable body 23 radially by the rotation of the drive bolt 49.

[0056] The drive bolt 49 may also be configured to be screwed into the base member 21 and engaged with the movable body 23 so as to be rotatable relative to it. In this case, the drive bolt 49 moves radially in response to the axial rotation operation, thereby moving the movable body 23. The drive bolt 49 may omit the head portion 49a, and it is sufficient that the axial rotation operation can be performed by a tool or device within the range that protrudes from the base member 21.

[0057] The drive unit 27 controls the driving force that moves the movable body 23, causing the pressing unit 25 to contact the conductive wire 15 with the terminal 17 with a specified pressing force. In this embodiment, the contact of the conductive wire 15 with the terminal 17 can be made with a specified pressing force by controlling the tightening torque of the drive bolt 49, which serves as the driving force.

[0058] Furthermore, the drive unit 27 can also be a linear actuator that uses, for example, fluid pressure or solenoid force.

[0059] Figure 6 is an enlarged cross-sectional view showing a portion of the jig 19 in Figure 2. Figure 7 is an enlarged plan view showing a portion of Figure 5.

[0060] As shown in Figures 6 and 7, each pressing portion 25 comprises a wire-facing portion 53 and a cover contact portion 55. The cover contact portion 55 is provided projecting axially from the wire-facing portion 53. The wire-facing portion 53 is formed in a plate-like or block-like shape and comprises a plurality of holes 53a and 53b and a pressing surface 53c. The plurality of holes 53a and 53b are arranged radially.

[0061] The holes 53a and 53b are provided along the axial direction, and the fitting pin 47b at the tip of the pressing force transmission part 47 is fitted into them by insertion in the axial direction. This fitting allows the pressing part 25 to be replaced relative to the movable body 23.

[0062] Furthermore, the hole 53a is concave relative to the wire-facing portion 53, and the hole 53b penetrates the wire-facing portion 53 in the axial direction. The replaceable support of the pressing portion 25 can be achieved by various structures such as fitting and screw fastening. In addition, the pressing portion 25 can also be formed integrally with the movable body 23.

[0063] The pressing surface 53c is the surface that contacts the conductive wire 15 and presses against it. In this embodiment, the pressing surface 53c is oriented radially outward. The pressing surface 53c is positioned offset axially towards the base member 21 from the contact portion between the terminal 17 and the conductive wire 15.

[0064] In this embodiment, the pressing surface 53c is concave relative to the conductive wire 15 in a plan view. Specifically, the pressing surface 53c consists of a pair of slopes that transition from the circumferential center toward the conductive wire 15 on both sides. However, the pressing surface 53c can also be a concave curved surface or a flat surface.

[0065] The pressing surface 53c holds the conductive wires 15 when it presses the pair of conductive wires 15 with the pair of inclined surfaces. In this embodiment, the conductive wires 15 are held while a force is applied to the pair of conductive wires 15 to pull them inward in the circumferential direction.

[0066] The shape of the pressing surface 53c may be formed on the terminal 17. The shape of the edge recess 17a may also be formed on the wire-facing portion 53. Either the wire-facing portion 53 or the edge of the terminal 17, or both, may be formed linearly in a plan view, perpendicular to the radial direction.

[0067] When using such a jig, the stator 1, before welding, is placed on the base member 21 inside the stud boss 35, as shown in Figure 3. In this placement, the pressing portion 25 of the jig 19 is positioned so that, in a plan view, it is directed radially toward the terminal 17 via the conductive wire 15.

[0068] Next, the cover 37 is attached to the tip of the stud boss 35. That is, the cover 37 is placed on the tip of the stud boss 35, and bolts 39 are fastened to the female threads of the stud boss 35 through the through holes in the cover 37. In this state, the terminals 17 and conductive wires 15 are exposed at each of the work windows 41 of the cover 37.

[0069] Then, the conductive wire 15 is brought into contact with the terminal 17. Specifically, when the head portion 49a of each drive bolt 49 is rotated, the sliding portion 45 of the movable body 23 that is screwed in is pulled radially outward and moves due to the rotation of the drive bolt 49. The rotational drive of the head portion 49a can be performed automatically by equipment such as a robot, or manually by a tool.

[0070] The movement of the movable body 23 causes the pressing force transmission section 47 to move in the same direction. As a result, the wire-facing portion 53 of the pressing section 25 presses the conductive wire 15 with the pressing surface 53c. This pressing causes the pair of conductive wires 15 to come into contact with the terminal 17. Contact is achieved by pressing each of the pair of conductive wires 15 against the edge recess 17a of the terminal 17. In this embodiment, when the pressing section 25 presses the conductive wire 15, the pair of inclined surfaces of the pressing surface 53c also press the pair of conductive wires 15 inward in their respective circumferential directions, thereby positioning the conductive wires 15.

[0071] Each edge recess 17a that contacts the conductive wire 15 is formed on the terminal 17 in the shape of a circular arc with approximately the same curvature as the outer surface of the conductive wire 15. The conductive wire 15 housed in the edge recess 17a may be in contact with the outer surface, although it is slightly separated in the circumferential direction. The edge recess 17a may be omitted. Alternatively, the shape of the edge recess 17a may be provided on the pressing surface 53c.

[0072] This pressing force causes the conductive wire 15 to make contact with the terminal 17. At this time, the pressing of the conductive wire 15 is performed at a position offset in the axial direction of the conductive wire 15 from the contact point between the conductive wire 15 and the terminal 17. Therefore, the conductive wire 15 makes contact with the terminal 17 with its own elasticity in response to the pressing force from the jig 19.

[0073] The contact pressure of the conductive wire 15 can be reliably received by the terminal 17 in the planar direction of the plate.

[0074] As a result, it becomes possible to accurately maintain the pressing force applied by the pressing portion 25 to the terminal 17 via the conductive wire 15.

[0075] This pressing force is increased to a specified value by controlling the tightening torque, which is the driving force of the head portion 49a. The specified pressing force is the pressing force that provides an appropriate contact pressure for, for example, arc welding, at the contact area between the conductive wire 15 and the terminal 17. "Appropriate" means a degree that allows sufficient penetration of the conductive wire 15, and is set appropriately according to the welding method and the type of material being welded.

[0076] In this embodiment, the tightening torque increases due to the elasticity of the conductive wire 15 in response to the tightening of the drive bolt 49. By controlling this tightening torque, the pressing force of the jig 19 for bringing the conductive wire 15 into contact with the terminal 17 is kept within a specified range.

[0077] After the pressing force is set to the specified range, welding is performed on the conductive wire 15 and the terminal 17 in each work window 41. In this embodiment, arc welding is performed. However, resistance welding may also be used.

[0078] In arc welding, the coil 7 is grounded, and the conductive wire 15 is on the negative voltage side via the coil 7. The torch is brought into contact through the work window 41 to perform arc welding between the terminal 17 and the conductive wire 15. The torch is positioned around the contact point between the terminal 17 and the conductive wire 15. In some cases, the torch may not be brought into contact with the terminal 17 or the conductive wire 15.

[0079] This arc welding forms a welded joint W that connects the contact points between the terminal 17 and the conductive wire 15. At this time, since the pair of conductive wires 15 are in uniform contact with the terminal 17 with a specified pressing force, uniform and sufficient penetration occurs.

[0080] As described above, the welding method of this embodiment involves driving a jig 19, which can be operated from outside the stator 1, to bring it into contact with the conductive wire 15 and the terminal 17. By controlling the driving force of the jig 19, welding can be performed while applying a specified pressing force between the conductive wire 15 and the terminal 17.

[0081] Therefore, there is no variation in the contact area and contact pressure between the conductive wire 15 and the terminal 17, and the welding quality can be stabilized. In this embodiment, the welding quality can be uniformly stabilized at multiple welding locations, and the performance of the stator 1 can be stabilized.

[0082] Furthermore, at each welded portion, two conductive wires 15 are arranged in parallel and uniformly contact the terminal 17 with a specified pressing force before welding. This suppresses variations in the welding of each conductive wire 15, thereby stabilizing the welding quality.

[0083] The pressure applied to the conductive wire 15 is performed at a position offset in the axial direction of the conductive wire 15 from the contact point between the conductive wire 15 and the terminal 17, and the conductive wire 15 is brought into contact with the terminal 17 by its elasticity.

[0084] Therefore, the driving force of the jig 19 can be reliably increased in accordance with the increase in the pressing force that brings the conductive wire 15 into contact with the terminal 17, and the pressing force can be easily and reliably controlled.

[0085] The conductive wire 15 can be positioned in the recess 17a at the edge of the terminal 17, making it easier to ensure uniform contact area and contact pressure between the conductive wire 15 and the terminal 17, thereby more reliably stabilizing the welding quality.

[0086] The jig 19 used in the welding method of the embodiment of the present invention supports the stator 1 on the base member 21, and moves the movable body 23 by the rotational drive of the head portion 49a of the drive unit 27, thereby bringing the conductive wire 15 into contact with the terminal 17 by the pressing portion 25.

[0087] In this case, the jig 19 allows the conductive wire 15 and the terminal 17 to come into contact with a specified pressing force by controlling the driving force of the movable body 23. Therefore, by welding the conductive wire 15 and the terminal 17 in this contact state, variations in welding can be suppressed and welding quality can be stabilized.

[0088] Since the pressing surface 53c of the pressing portion 25 is concave relative to the conductive wire 15, the conductive wire 15 can be positioned relative to the end edge of the terminal 17.

[0089] Therefore, variations in welding can be suppressed, and the stability of welding quality can be more reliably achieved.

[0090] In this embodiment, since the pressing part 25 is replaceable relative to the movable body 23, the welding quality can be easily stabilized by repairing or replacing the pressing part 25.

[0091] In the movable body 23, the sliding part 45, which is linked to the drive unit 27, can be precisely moved along the base member 21. This movement allows force to be precisely transmitted to the pressing part 25 via the pressing force transmission part 47, thereby precisely applying a specified pressing force to the conductive wire 15.

[0092] The drive unit 27 can rotate the head portion 49a of the drive bolt 49 on the radially outer side of the base member 21, and can reliably transmit the driving force to the pressing portion 25 located on the radially inner side of the stator 1. [Explanation of Symbols]

[0093] 1 Stator 3 Stator Core 7 coils 9 Bus Bar 13 Teeth 15 Conductive wire 17 terminals 17a Edge recess 19 Jig 21 Base member 23 Movable body 25 Pressing part 27 Drive unit 35 Stud Boss (Stud Part) 37 Cover 41 Work window 5. Sliding part 47 Pressure transmission section 49 Drive bolts 49a Head section 53 Opposite section of the power line 53c Pressing surface W Weld

Claims

1. A welding method in which conductive wires of coils inside an assembly and terminals of busbars are brought into contact with each other and welded together, The jig is driven from outside the assembly to bring one of the conductive wires and the terminal into contact with the other conductive wire and terminal by the pressing force of the jig. Contact between the conductive wire and the terminal is made by pressing the conductive wire with the jig at a position offset in the axial direction of the conductive wire from the contact portion between the conductive wire and the terminal. By controlling the driving force of the jig, the welding is performed while keeping the pressing force within a specified range. Welding method.

2. A welding method according to claim 1, The aforementioned assembly is an assembly used in a rotating electric machine. Welding method.

3. A welding method according to claim 1, The edge of the terminal is provided with an edge recess for positioning the conductive wire, The conductive wire is such that the contact is made in the edge recess. Welding method.

4. A welding method according to any one of claims 1 to 3, The conductive wires, at least two of which are arranged in parallel, contact the terminal with the specified pressing force. Welding method.

5. A welding method for welding a conductive wire of a coil inside an assembly to a terminal of a busbar by bringing the two together into contact, wherein the jig is driven from outside the assembly to bring one of the conductive wires and the terminals into contact with the other conductive wire and terminal by the pressing force of the jig, and the welding is performed while controlling the driving force of the jig to keep the pressing force within a specified range, A base member that supports the assembly, A movable body is provided so as to be movable relative to the base member, The movable body is provided with a pressing portion that directs one of the conductive wires of the coil and the terminal of the busbar towards the other conductive wire of the coil and the terminal of the busbar, The system includes a drive unit that moves the movable body to press the conductive wire of the coil and the other terminal of the busbar against one of the conductive wires of the coil and the terminal of the busbar with the pressing force of the pressing unit, The drive unit makes it possible to keep the pressing force within a specified range by controlling the driving force of the movable body. jig.

6. The jig according to claim 5, The pressing portion has a concave pressing surface relative to the conductive wire. jig.

7. The jig according to claim 5, The pressing portion is removably supported by the movable body, jig.

8. The jig according to claim 5, The movable body comprises a sliding portion that moves along the base member in conjunction with the drive unit and a pressing force transmission portion that is integrally provided with the sliding portion and coupled to the pressing portion. jig.

9. The jig according to claim 5, The drive unit includes a drive bolt, The drive bolt comprises a radially inner portion that penetrates the base member radially and is screwed into the movable body, and a radially outer portion that protrudes from the base member in a manner that allows for axial rotation. jig.

10. A jig according to any one of claims 5 to 9, The base member has a stud portion erected on it. The stud portion supports the cover that covers the coil and busbar, The cover is provided with a work window that exposes the terminals and the conductive wires. jig.

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