Welding method and clamp

Abstract

The invention provides a welding method capable of suppressing welding deviation in an assembly. The present invention relates to a welding method for welding a conductive wire (15) and a terminal (17) inside an assembly (1) by bringing the conductive wire (15) and the terminal (17) into contact with each other, in which a jig (19) that can be operated from the outside of the assembly (1) is driven, and the conductive wire (15) and the terminal (17) are brought into contact with each other. By managing the driving force of the jig (19), welding is performed while a predetermined pressing force is applied between the conductive wire (15) and the terminal (17).

Description

TECHNICAL FIELD

[0001] The present application relates to a welding method and jig for a stator or the like of a rotary electric machine. BACKGROUND

[0002] As a conventional welding method, there is the method described in Patent Literature 1. In this welding method, the bus bar of the stator of a rotary electric machine has a conductive wire connecting portion as a terminal, which is held to the conductive wire connecting portion by, for example, riveting of a side wall portion bent in a manner of surrounding two conductive wires of a coil. In this held state, the conductive wire connecting portion and the conductive wire are joined by arc welding.

[0003] In the welding method described in this Patent Literature 1, sometimes the contact area and the contact pressure of the conductive wire and the conductive wire connecting portion are deviated due to the deviation of the precision of various dimensions, the riveting process, and the like.

[0004] Generally, in welding, in the case of widely and strongly contacting the contact area and the contact pressure between two members, heat conduction is good. That is, by welding, the melting of the portion between the two members where the heat conduction is good is preferentially started. Therefore, in the case where the contact area and the contact pressure of the electric wire and the conductive wire connecting portion are deviated, for example, the portion where the contact pressure is weak and the like is insufficiently melted and ends, and the welding is easily deviated.

[0005] On the contrary, if the welding time is extended, the welding portion can be sufficiently melted all over. However, in the inside of the assembly such as a stator, there are the conductive wire, the insulating covering of the coil, and the surrounding resin material around the welding portion, and from the viewpoint of heat resistance, the welding time is limited.

[0006] PRIOR ART DOCUMENTS

[0007] PATENT LITERATURE

[0008] Patent Literature 1: Japanese Patent No. 5417721 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] The problem to be solved is that the welding in the inside of the assembly is easily deviated.

[0011] MEANS FOR SOLVING THE PROBLEMS

[0012] The present application provides a welding method in which a conductive wire of a coil inside an assembly and a terminal of a bus bar are brought into contact with each other and are welded. In the welding method, one of the conductive wire of the coil and the terminal of the bus bar is brought into contact with the other of the conductive wire of the coil and the terminal of the bus bar by driving a jig from the outside of the assembly and using a pressing force of the jig, and the pressing force is set to a predetermined range by managing a driving force of the jig and the welding is performed.

[0013] Further, the present application provides a jig for the welding method. The jig includes a base member that supports the assembly, a movable body that is provided so as to be movable with respect to the base member, a pressing portion that is provided to the movable body and that is directed toward the other of the conductive wire of the coil and the terminal of the bus bar across the one of the conductive wire of the coil and the terminal of the bus bar, and a driving portion that moves the movable body and brings the one of the conductive wire of the coil and the terminal of the bus bar into contact with the other of the conductive wire of the coil and the terminal of the bus bar using the pressing force of the pressing portion. The driving portion can set the pressing force to a predetermined range by management of a driving force of the movable body.

[0014] Effects of Invention

[0015] The present application can suppress variation in welding inside an assembly. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a perspective view of a stator of an embodiment.

[0017] Figure 2 is a perspective view of a jig that supports a stator of Figure 1 .

[0018] Figure 3 is an exploded perspective view of a stator of Figure 1 and a jig.

[0019] Figure 4 is a sectional view of a jig of Figure 2 .

[0020] Figure 5 is an enlarged plan view of a portion of a jig of Figure 2 .

[0021] Figure 6 is an enlarged sectional view of a portion of a jig of Figure 2 .

[0022] Figure 7 is an enlarged plan view of a portion of a jig of Figure 5 . DETAILED DESCRIPTION

[0023] By bringing the conductive wire of the coil welded with the jig into contact with the terminal of the bus bar at a predetermined pressing force, the purpose of suppressing the deviation of the welding inside the assembly is achieved.

[0024] The welding method causes the conductive wire 15 of the coil 7 inside the assembly 1 and the terminal 17 of the bus bar 9 to be in contact with each other and to be welded. In this welding method, the jig 19 is driven from the outside of the assembly 1, and one of the conductive wire 15 and the terminal 17 is brought into contact with the other of the conductive wire 15 and the terminal 17 by the pressing force of the jig 19. By managing the driving force of the jig 19, the pressing force is set to a predetermined range and welding is performed.

[0025] The conductive wire 15 and the terminal 17 inside the assembly 1 on which the welding is performed can be the conductive wire and the terminal of the bus bar of a rotating electric machine or a power electronic device.

[0026] In one embodiment, the assembly 1 is an assembly for a rotating electric machine.

[0027] The pressing of the conductive wire 15 can be performed at a position offset from the contact portion of the conductive wire 15 and the terminal 17 in the axial direction of the conductive wire 15, and the conductive wire 15 is brought into contact with the terminal 17.

[0028] The end edge of the terminal 17 can have an end edge recess 17a that positions the conductive wire 15. In this case, the conductive wire 15 is in contact with the terminal 17 at the end edge recess 17a.

[0029] The number of conductive wires 15 welded to the terminal 17 is not particularly limited. As one embodiment, the conductive wire 15 can be brought into contact with the terminal 17 at a predetermined pressing force in a state in which at least two conductive wires are arranged side by side.

[0030] The jig 19 used in the welding method has 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 to the movable body 23 and points toward the other of the conductive wire 15 and the terminal 17 with the one of the conductive wire 15 and the terminal 17 interposed. The driving portion 27 moves the movable body 23 and brings the one of the conductive wire 15 and the terminal 17 into contact with the other of the conductive wire 15 and the terminal 17 by the pressing force of the pressing portion 25. Furthermore, the driving portion 27 can set the pressing force to a predetermined range by management of the driving force of the movable body 23.

[0031] The pressing portion 25 can adopt an appropriate shape, but as one embodiment, can have a concave pressing surface 53c with respect to the conductive wire 15.

[0032] In addition, the pressing portion 25 can be integral with or separate from the movable body 23, but can also be configured in separate parts and supported to the movable body 23 in a replaceable manner.

[0033] The movable body 23 can be provided with a sliding portion 45 and a pressing force transmission portion 47. The sliding portion 45 moves along the base member 21 in conjunction with the driving portion 27. The pressing force transmission portion 47 is provided integrally to the sliding portion 45 and coupled to the pressing portion 25.

[0034] In one embodiment, the driving portion 27 can be provided with a driving bolt 49. The driving bolt 49 penetrates the base member 21 in the radial direction, has a radially inner portion that is screwed to the movable body 23, and a radially outer portion that protrudes from the base member 21 in a manner that allows shaft rotation operation.

[0035] The base member 21 can be provided with a cover 37 via a stud portion 35. The stud portion 35 is provided upright to the base member 21, and the cover 37 covers the coil 7 and the bus bar 9. The cover 37 is provided with a work window 41 that exposes the terminal 17 and the conductive wire 15.

[0036] Embodiment

[0037] [Stator]

[0038] Figure 1 is a perspective view of an example of a stator.

[0039] Figure 1 The stator 1 of is configured together with a rotor (not shown) as a rotary electric machine. The rotary electric machine is configured as, for example, a three-phase (U-phase, V-phase, W-phase) AC motor. In the following description, the radial direction, the circumferential direction, and the axial direction are the radial direction, the circumferential direction, and the axial direction of the stator 1.

[0040] The stator 1 is provided with a stator core 3, an insulator 5, a coil 7, a bus bar 9, and the like. The stator 1 is an example of an assembly of the present embodiment, and other structures can also be employed. In addition, the assembly is not limited to the stator 1 as an assembly of a rotary electric machine, and can be an electric power electronic device or the like.

[0041] The stator core 3 is configured, for example, by laminating a plurality of annular electromagnetic steel sheets. The stator core 3 has a yoke 11 and teeth 13, which are covered by the insulator 5 as described above. Each tooth 13 has a conductive wire 15 covered by an insulating film wound therearound, and the wound conductive wire 15 forms the coil 7. The cross section of the conductive wire 15 of the present embodiment is circular.

[0042] The bus bar 9 is a conductive member for supplying driving current of three phases to the coil 7. The bus bar 9 of each phase is appropriately disposed on the insulator 5 from the connector 18, and connected to the coil 7. Therefore, on the bus bar 9, a terminal 17 for connection to the coil 7 is provided.

[0043] The terminal 17 extends from the bus bar 9 to the radially inner side, and is protrusively provided as a plate shape having a width in the circumferential direction. The radially inner end edge of the terminal 17 is joined with the end portion of the conductive wire 15 of the coil 7 through a welding portion W (refer to Figure 7 ). The respective end portions of the bus bars 9 are arranged as the three-phase connector terminals 18a, 18b, and 18c within the connector 18.

[0044] [Method of welding]

[0045] The method of welding of this embodiment welds the conductive wire 15 of the coil 7 of the stator 1 and the terminal 17 of the bus bar 9. When the welding is performed, the conductive wire 15 and the terminal 17 are brought into contact by the jig 19.

[0046] Figure 2 is a perspective view showing the jig 19 that supports the stator 1 of Figure 1 . Figure 3 is an exploded perspective view showing the stator 1 and the jig 19 of Figure 2 , with the cover 37 omitted. Figure 4 is a cross-sectional view of the jig 19 of Figure 2 . Figure 5 is an enlarged plan view showing a part of the jig 19 of Figure 2 , with the cover 37 omitted.

[0047] As shown in Figure 2 to Figure 5 , the jig 19 used in the method of welding of this embodiment is configured as a jig that can be driven from the outside of the stator 1. The jig 19 brings the conductive wire 15 of the coil 7 and the terminal 17 of the bus bar 9 into contact with each other by a pressing force by driving, and sets the pressing force to a predetermined range by management of the driving force. In this embodiment, the jig 19 is provided with a base member 21, a movable body 23, a pressing portion 25, and a driving portion 27.

[0048] The base member 21 supports the stator 1 on one side in the axial direction. The base member 21 of this embodiment is formed as a plate shape, and the planar shape is a hexagon. However, the shape of the base member 21 is not particularly limited. A recessed portion 29 is formed in the central portion of the base member 21. The recessed portion 29 is concave in the plate thickness direction of the base member 21, and is open upward. The upward direction here means the upward direction in the drawing, and is not necessarily the upward direction in the vertical direction.

[0049] In this embodiment, the plate thickness direction of the base member 21 coincides with the axial direction of the stator 1. In addition, the central portion of the base member 21 is a portion other than the outer peripheral portion of the base member 21. The planar shape of the recessed portion 29 is not particularly limited, and is circular in this embodiment.

[0050] In the central portion of the recess 29 excluding the outer peripheral portion, a core 33 is arranged with the spacer 31 interposed therebetween. The outer peripheral portion of the recess 29 is a circumferential portion that surrounds the spacer 31. A plurality of groove-shaped recesses 34 are formed in the outer peripheral portion of the recess 29. Each of the groove-shaped recesses 34 is concave in the plate thickness direction of the base member 21 like the recess 29, and is open upward. The groove-shaped recess 34 is in a groove shape that extends radially outward from the wall portion that divides the recess 29 in plan view. The plurality of groove-shaped recesses 34 are arranged at intervals in the circumferential direction.

[0051] 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. The through-hole 21a formed in the base member 21 communicates with the groove-shaped recess 34 in the radial direction. The through-hole 21a penetrates in the radial direction from the outer surface of the base member 21 toward the groove-shaped recess 34.

[0052] A stud boss 35 as a stud portion is provided upright on the base member 21. The arrangement positions and the number of the stud bosses 35 are not particularly limited, but in the present embodiment, six stud bosses 35 are arranged in correspondence with the angular portions of the planar shape of the base member 21, respectively.

[0053] The stud boss 35 supports a cover 37 that covers the coil 5 and the bus bar 9 at the front end. The cover 37 is formed with through-holes not shown corresponding to the stud bosses 35. Bolts 39 are fastened to the internal threads not shown of the stud bosses 35 via the respective through-holes. The mounting and dismounting of the cover 37 are performed by the bolts 39.

[0054] In addition, the stud portion can be a columnar shape that supports the cover 37, and can also be a structure in which a stud bolt is mounted on the stud boss 35. In this case, a nut is used instead of the bolt 39. In addition, a bolt, a nut, or the like can not be used as long as the cover 37 can be fixed.

[0055] The cover 37 is formed in a plate shape that covers the coil 7 and the bus bar 9, and is formed in a circular plate shape in the present embodiment. However, the planar shape of the cover 37 is not particularly limited. The cover 37 has an operation window 41 that exposes the terminal 17 and the conductive wire 15, and a cutout portion 43 for a connector.

[0056] The operation window 41 is formed at six places in the present embodiment, respectively. The operation window 41 is a cross-sectional shape that expands from the terminal 17 and the conductive wire 15 side toward the outer surface of the cover 37 in the plate thickness direction. The cross-sectional shape of the operation window 41 is not particularly limited, but in the embodiment, the operation window 41 expands in a stepped manner.

[0057] The cover 37 is used to suppress the influence of heat at the time of welding on the stator 1, but can also be omitted.

[0058] The movable body 23 is provided so as to be movable with respect to the base member 21. In the present embodiment, the movable body 23 is provided to the base member 21. However, the movable body 23 can be a structure that is movable with respect to the base member 21, and is not necessarily provided to the base member 21.

[0059] The movable body 23 is arranged along the groove-shaped recess 34 so as to be movable in the radial direction. However, the direction of movement of the movable body 23 is appropriately set according to the contact direction of the conductive wire 15 of the coil 7 and the terminal 17 of the bus bar 9.

[0060] The movable body 23 of the present embodiment described above is provided with a sliding portion 45 and a pressing force transmission portion 47, respectively.

[0061] The sliding portion 45 moves along the base member 21 in conjunction with the driving portion 27. The base portion 45a on the radially outer side of the sliding portion 45 is formed to be relatively wide in width.

[0062] The circumferential width of the base portion 45a corresponds to the width of the groove-shaped recess 34. The base portion 45a is fitted to the groove-shaped recess 34 and is guided along the groove-shaped recess 34. The front end portion 45b on the radially inner side of the sliding portion 45 projects toward the spacer 31 and is positioned below the bottom surface of the core bone 33. Thus, movement in the radial direction of the sliding portion 45 can be stably performed.

[0063] The pressing force transmission portion 47 is formed in a columnar shape and stands up in the axial direction from the sliding portion 45. An inclined portion 47a is formed between the pressing force transmission portion 47 and the sliding portion 45. The pressing force transmission portion 47 supports the pressing portion 25, which is a structure provided to the movable body 23.

[0064] The pressing portion 25 points to the radially inner side with the conductive wire 15 interposed therebetween with respect to the terminal 17 when viewed in plan. The pressing portion 25 of the present embodiment is supported at the front end of the pressing force transmission portion 45. However, the pressing portion 25 can be supported at the intermediate portion in the axial direction of the pressing force transmission portion 45 or the like.

[0065] The pressing portion 25 is in contact with the lower surface of the cover 37 in a relatively movable manner. However, the pressing portion 25 can be separated from the lower surface of the cover 37. Details of the pressing portion 25 will be described later.

[0066] The driving portion 27 moves the movable body 23 in conjunction with the movable body 23. Through the movement of the movable body 23, the pressing portion 25 presses the conductive wire 15 against the terminal 17 to make them contact.

[0067] In the present embodiment, the driving section 27 is configured to have a plurality of driving bolts 49. Each driving bolt 49 penetrates the base member 21 in the radial direction with respect to the base member 21 via the insertion hole 21a. The driving bolt 49 penetrates the base member 21 in the radial direction from the inside to the outside, has a radially inner portion that is screwed with the movable body 23, and has a radially outer portion that protrudes from the base member 21 in a manner that enables the shaft rotation operation.

[0068] In the present embodiment, the radially outer portion of the driving bolt 49 is provided with a head portion 49a that is arranged protruding to the radially outer side of 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 is capable of the shaft rotation operation by a tool or equipment.

[0069] Therefore, the driving section 27 is capable of moving the movable body 23 in the radial direction by the rotation of the driving bolt 49.

[0070] In addition, the driving bolt 49 can also be configured to be screwed with the base member 21 and engaged with the movable body 23 in a manner that enables the relative rotation. In this case, the driving bolt 49 moves the movable body 23 in the radial direction according to the shaft rotation operation. The driving bolt 49 can also omit the head portion 49a as long as the shaft rotation operation by a tool or equipment is possible in the range of protruding from the base member 21.

[0071] This driving section 27 enables the press section 25 to contact the conductive wire 15 with the terminal 17 with a predetermined pressing force by the management of the driving force that moves the movable body 23. In the present embodiment, the contact of the conductive wire 15 with respect to the terminal 17 with a predetermined pressing force is possible by managing the tightening torque of the driving bolt 49 as the driving force.

[0072] Furthermore, the driving section 27 can also be another direct acting actuator based on the fluid pressure, solenoid force, or the like.

[0073] Figure 6 is an enlarged sectional view of a portion of the clamp 19 shown in Figure 2 . Figure 7 is an enlarged plan view of a portion of the clamp 19 shown in Figure 5 .

[0074] As shown in Figure 6 and Figure 7 , each press section 25 is provided with a wire opposing portion 53 and a cover contact portion 55. The cover contact portion 55 is provided protruding in the axial direction on the wire opposing portion 53. The wire opposing portion 53 is formed in a plate shape or a block shape, and is provided with a plurality of hole portions 53a, 53b and a press surface 53c. The plurality of hole portions 53a, 53b are arranged in the radial direction.

[0075] Holes 53a and 53b are arranged axially, and the fitting pin 47b at the front end of the pressure transmission part 47 is engaged by axial insertion. Through this engagement, the pressing part 25 is supported on the movable body 23 in a replaceable manner.

[0076] Furthermore, the hole 53a is concave relative to the wire-opposing part 53, and the hole 53b extends axially through the wire-opposing part 53. The replaceable support for the pressing part 25 can be achieved through various structures such as threaded fastening, in addition to fitting. Alternatively, the pressing part 25 can also be integrally formed with respect to the movable body 23.

[0077] The pressing surface 53c is the surface that contacts and presses the conductive wire 15. In this embodiment, the pressing surface 53c points outward in the radial direction. The pressing surface 53c is positioned on the axially upward side of the base member 21 compared to the contact portion between the terminal 17 and the conductive wire 15.

[0078] In this embodiment, the pressing surface 53c is concave relative to the conductive wire 15 when viewed from above. Specifically, the pressing surface 53c is composed of a pair of inclined surfaces that transition from the circumferential center towards both sides of the conductive wire 15. However, the pressing surface 53c may also be formed as a concave shape composed of curved surfaces or as a flat surface, etc.

[0079] The pressing surface 53c holds the conductive wires 15 in place when a pair of inclined surfaces press against them. In this embodiment, the conductive wires 15 are held in place while a force is applied to them inward in a circumferential direction.

[0080] Alternatively, the shape of the pressing surface 53c can be formed on the terminal 17. Additionally, the shape of the end edge recess 17a can be formed on the wire-opposing portion 53. It is also possible to form one or both of the end edges of the wire-opposing portion 53 and the terminal 17 perpendicular to the radial direction and appearing as a straight line when viewed from above.

[0081] When using this clamp, such as Figure 3 As shown, the stator 1 before welding is placed on the base component 21 inside the stud boss 35. In this placement, when viewed from above, the pressing portion 25 of the clamp 19 is arranged radially across the conductive wire 15 to point towards the terminal 17.

[0082] Next, a cover 37 is installed on the front end of the stud boss 35. That is, the cover 37 is placed on the front end of the stud boss 35, and bolts 39 are fastened to the internal threads of the stud boss 35 through the through holes of the cover 37. In this state, the terminal 17 and the conductive wire 15 are exposed to the working windows 41 of the cover 37.

[0083] Then, the conductive wire 15 is brought into contact with the terminal 17. Specifically, when the head 49a of each drive bolt 49 is rotationally driven, the sliding portion 45 of the movable body 23 that is screwed by the rotation of the drive bolt 49 is pulled and moved to the radially outer side. The rotational drive of the head 49a can be performed automatically by a robot or the like, or manually by a tool.

[0084] By the movement of the movable body 23, the pressing force transmission portion 47 is moved in the same direction. Thus, the wire opposing portion 53 of the pressing portion 25 presses the conductive wire 15 by the pressing surface 53c. By this pressing, the pair of conductive wires 15 are brought into contact with the terminal 17. The contact is performed by pressing the pair of conductive wires 15 to the edge recessed portions 17a of the terminal 17, respectively. In the present embodiment, when the pressing portion 25 presses the conductive wire 15, the pair of inclined surfaces of the pressing surface 53c also press the respective circumferential inner sides of the pair of conductive wires 15, and the conductive wire 15 can be positioned.

[0085] Each edge recessed portion 17a with which the conductive wire 15 comes into contact is formed in the terminal 17 as a circular arc having substantially the same curvature as the outer peripheral surface of the conductive wire 15. The outer peripheral surfaces of the conductive wires 15 housed in the edge recessed portions 17a are slightly separated in the circumferential direction, but can also be in contact. Alternatively, the edge recessed portions 17a can be omitted. Further, the shape of the edge recessed portions 17a can be provided on the pressing surface 53c.

[0086] By this pressing, the conductive wire 15 is brought into contact with the terminal 17 by the pressing force. At this time, the pressing of the conductive wire 15 is performed at a position that is offset in the axial direction of the conductive wire 15 from the contact portion of the conductive wire 15 with the terminal 17. Thus, the conductive wire 15 is brought into contact with the terminal 17 in accordance with the elastic force of the conductive wire 15 in response to the pressing force of the jig 19.

[0087] The terminal 17 can reliably withstand the contact pressure of the conductive wire 15 in the planar direction of the plate.

[0088] As a result, the pressing force of the pressing portion 25 to the terminal 17 via the conductive wire 15 can be accurately maintained.

[0089] The pressing force is increased to a predetermined value by managing the tightening torque as the driving force of the head 49a. The predetermined pressing force is a pressing force that becomes a contact pressure suitable for arc welding, for example, in the contact area between the conductive wire 15 and the terminal 17. Suitable means a degree at which sufficient penetration of the conductive wire 15 can be performed, and is appropriately set in accordance with the welding method and the type of the member to be welded.

[0090] In the present embodiment, the tightening torque is increased by the elastic force of the conductive wire 15 in accordance with the tightening of the drive bolt 49. By managing the tightening torque, the pressing force of the jig 19 for bringing the conductive wire 15 into contact with the terminal 17 is set to a range of a predetermined value.

[0091] After setting the pressing pressure to a predetermined range, the conductive wire 15 and the terminal 17 are welded in each work window 41. In this embodiment, arc welding is performed. However, resistance welding can also be used.

[0092] In arc welding, coil 7 is grounded, and conductor 15 becomes the negative voltage side via coil 7. The welding torch contacts the terminal 17 and conductor 15 through the work window 41 to perform arc welding. The welding torch is positioned around the contact area between terminal 17 and conductor 15. Alternatively, the welding torch may not contact terminal 17 or conductor 15.

[0093] By performing this arc welding, a welded portion W is formed that joins the terminal 17 with the conductive wire 15. At this time, the pair of conductive wires 15 are in uniform contact with the terminal 17 with a predetermined pressing force, thus enabling uniform and sufficient melting.

[0094] As explained above, the welding method of this embodiment drives the clamp 19, which operates externally to the stator 1, to make contact between the conductive wire 15 and the terminal 17. Furthermore, by managing the driving force of the clamp 19, welding can be performed while applying a predetermined pressing pressure between the conductive wire 15 and the terminal 17.

[0095] Therefore, the contact area and contact pressure between the conductive wire 15 and the terminal 17 are without deviation, ensuring stable welding quality. In this embodiment, the welding quality can be uniformly and stably maintained at multiple welding points, thereby stabilizing the performance of the stator 1.

[0096] Furthermore, in each welding section, the two conductive wires 15, arranged side-by-side, are uniformly contacted with the terminal 17 and welded using a predetermined pressing pressure. Therefore, welding deviations in each conductive wire 15 can be suppressed, resulting in stable welding quality.

[0097] The pressing of the conductive wire 15 is performed at a position offset axially from the contact portion between the conductive wire 15 and the terminal 17, and the conductive wire 15 contacts the terminal 17 through elasticity.

[0098] Therefore, the driving force of the clamp 19 can be reliably increased according to the increase of the pressing pressure that contacts the conductive wire 15 with the terminal 17, and the pressing pressure can be easily and reliably managed.

[0099] The conductive wire 15 can be positioned in the end edge recess 17a of the terminal 17, which makes it easier to make the contact area and contact pressure of the conductive wire 15 relative to the terminal 17 uniform, and can more reliably stabilize the welding quality.

[0100] The jig 19 used in the welding method of the embodiment of the present application is capable of supporting the stator 1 to the base member 21, and by the rotational drive of the head 49a of the drive section 27, the movable body 23 is moved to contact the conductive wire 15 to the terminal 17 by the pressing section 25.

[0101] At this time, in the jig 19, by the management of the driving force of the movable body 23, the contact of the conductive wire 15 to the terminal 17 is performed with a predetermined pressing force. Therefore, by welding the conductive wire 15 and the terminal 17 in this contact state, the deviation of the welding is suppressed, and the stabilization of the welding quality is achieved.

[0102] Since the pressing surface 53c of the pressing section 25 is concave with respect to the conductive wire 15, the conductive wire 15 is positioned with respect to the end edge of the terminal 17.

[0103] Therefore, the deviation of the welding is suppressed, and the stabilization of the welding quality is achieved more reliably.

[0104] In the present embodiment, the pressing section 25 is replaceable with respect to the movable body 23, and therefore, by the repair replacement or the like of the pressing section 25, the stabilization of the welding quality becomes easy.

[0105] In the movable body 23, the sliding section 45 linked to the drive section 27 is capable of being accurately moved along the base member 21. By this movement, the force is accurately transmitted to the pressing section 25 via the pressing force transmission section 47, and therefore, the predetermined pressing force is accurately applied to the conductive wire 15.

[0106] The drive section 27 is capable of performing the shaft rotation operation of the head 49a of the drive bolt 49 at the radial outside of the base member 21, and is capable of reliably transmitting the driving force to the pressing section 25 located at the radial inside of the stator 1.

[0107] Symbol explanation

[0108] 1 - stator; 3 - stator core; 7 - coil; 9 - bus bar; 13 - tooth; 15 - conductive wire; 17 - terminal; 17a - end edge recess; 19 - jig; 21 - base member; 23 - movable body; 25 - pressing section; 27 - drive section; 35 - stud boss (stud section); 37 - cover; 41 - work window; 5 - sliding section; 47 - pressing force transmission section; 49 - drive bolt; 49a - head; 53 - wire opposing section; 53c - pressing surface; W - welding section.

Claims

1. A welding method, characterized in that the conductive wires of a coil inside an assembly are brought into contact with the terminals of a busbar for welding, wherein... The conductive wire and the terminal are brought into contact with each other by the pressing pressure of the externally driven clamp of the assembly. The pressing force is set to a predetermined range by managing the driving force of the fixture, and the welding is performed.

2. The welding method according to claim 1, characterized in that, The assembly is an assembly for a rotating electric motor.

3. The welding method according to claim 1, characterized in that, At a position offset axially from the contact portion between the conductive wire and the terminal, the clamp presses the conductive wire to bring it into contact with the terminal.

4. The welding method according to claim 1, characterized in that, The terminal has an edge recess for positioning the conductive line. The contact of the conductive wire occurs at the end edge recess.

5. The welding method according to any one of claims 1 to 4, characterized in that, The conductive wires are in contact with the terminal with the predetermined pressing force when at least two are arranged side by side.

6. A clamp for use in the welding method of claim 1, characterized in that, have: Base component that supports the assembly; A movable body configured to move relative to the base component; The pressing part is provided on the movable body and points to the other side of the conductive line of the coil and the terminal of the busbar, separated by one of the conductive line of the coil and the terminal of the busbar. as well as A driving unit moves the movable body and uses the pressing force of the pressing unit to press one of the conductive wire of the coil and the terminal of the busbar against the other of the conductive wire of the coil and the terminal of the busbar. The drive unit can set the pressing force within a predetermined range by managing the driving force of the movable body.

7. The clamp according to claim 6, characterized in that, The pressing part has a pressing surface that is concave relative to the conductive wire.

8. The clamp according to claim 6, characterized in that, The pressing part is supported on the movable body in a replaceable manner.

9. The clamp according to claim 6, characterized in that, The movable body includes: a sliding part that moves along the base component in conjunction with the driving part; and a pressure transmission part integrally disposed on the sliding part and combined with the pressing part.

10. The clamp according to claim 6, characterized in that, The drive unit includes a drive bolt. The drive bolt passes radially through the base component and has a radially inner portion that engages with the movable body and a radially outer portion that protrudes from the base component in a manner that allows for axial rotation.

11. The clamp according to any one of claims 6 to 10, characterized in that, A stud is erected on the base component. The stud portion supports the cover that covers the coil and the busbar. The cover has a working window that exposes the terminals and the conductive wires.

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