Welding method and manufacturing method for rotating electric machine

Abstract

To provide a conductive wire capable of swiftly generating melting of a metal conductor when performing arc welding, a welding method, and a manufacturing method of a rotating electric machine.SOLUTION: A first conductive wire 31 has a tapered chevron projection 301 that generates an arc A between itself and the arc welding torch electrode 52 integrally with the linear body 30. When welding the first conductive wire 31 to the U-phase winding 121, an arc A is generated between the chevron projection 301 and the torch electrode 52 to dissolve the chevron projection 301.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention , melt The present invention relates to a connecting method and a manufacturing method for a rotating electric machine. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a connecting component that connects a stator winding and a terminal block of a rotating electric machine that is mounted on, for example, an electric vehicle or a so-called hybrid vehicle and used as a driving source and a generator for running is disclosed in Patent Document 1.

[0003] The connection component described in Patent Document 1 has a plurality of linear conductors, one end of which is connected to the winding and the other end of which is connected to a terminal block, and these linear conductors are connected to each other by a resin molded part. One end of the linear conductors and the stator winding are connected by welding. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-79528 A Summary of the Invention [Problem to be solved by the invention]

[0005] As a method for welding one end of the linear conductor to the winding of the stator, it is possible to use arc welding, which connects the metal conductors together by air discharge. However, as the capacity of rotating electric machines increases, the winding becomes thicker, and the linear conductor also becomes thicker. The heat generated by the discharge is diffused by thermal conduction of the winding and the linear conductor, and does not remain at the discharge point, so it takes a long time for the metal conductor to start melting. In addition, if the discharge time is long, there is a risk that the insulating layer such as enamel that covers the metal conductor of the winding and the linear conductor will melt due to the heat.

[0006] Therefore, the present invention is capable of quickly causing melting of a metal conductor when performing arc welding. Soluble The present invention aims to provide a connecting method and a manufacturing method for a rotating electric machine. [Means for solving the problem]

[0008] Books The present invention aims to solve the above problems, A welding method for welding a pair of conductive members by arc welding, comprising: forming a tapered angle-shaped protrusion integrally with a linear main body on one of the pair of conductive members; arranging a torch electrode of a welding head vertically above the angle-shaped protrusion; bringing the main body into contact with an end of the other of the pair of conductive members; and generating an arc between the angle-shaped protrusion and the torch electrode in a state in which a tip of the angle-shaped protrusion is closer to the torch electrode than an end face of the other conductive member; the arc melts the angle-shaped protrusion, and also melts a part of the main body starting from the angle-shaped protrusion, thereby welding the pair of conductive members. to provide.

[0009] In addition, in order to solve the above-mentioned problems, the present invention provides a method for manufacturing a rotating electric machine including a rotor and a stator, a winding wound around the stator, and a conductive wire welded to an end of the winding, the method comprising forming a tapered mountain-shaped protrusion on the conductive wire integrally with a linear body, A torch electrode of a welding head is disposed vertically above the angle-shaped projection of the conductive wire, and the conductive wire The body is brought into contact with the end of the winding. At the same time, the tip of the angle-shaped projection is closer to the torch electrode than the end face of the winding. In this state, the angled protrusion and The torch electrode An arc is generated between The arc melts the angled projection and also melts a portion of the main body starting from the angled projection; The winding and the conductive wire but welding Will be A method for manufacturing a rotating electric machine is provided. Effect of the Invention

[0010] According to the conductive wire, the welding method, and the method for manufacturing a rotating electric machine according to the present invention, it is possible to rapidly cause melting of a metal conductor when performing arc welding. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view showing a rotating electric machine according to a first embodiment of the present invention together with a terminal block. [Diagram 2] 1A and 1B are configuration diagrams of a rotating electric machine and a terminal block as viewed in the direction of the rotation axis and from the side. [Diagram 3] FIG. 2 is a circuit diagram showing an example of the configuration of an electric circuit in a three-phase motor formed by windings. [Figure 4]1A is a perspective view showing a connection component, and FIG. 1B is a perspective view showing first to sixth conductive wires, with the first to third molded resin portions not shown. [Diagram 5] 13(a) and 13(b) are perspective views showing one end of a U-phase winding and one end of a first conductive wire before and after welding. [Figure 6] 1(a) to 1(c) are an axial end view, a front view, and a side view of one end of a first conductive wire, and 1(d) is a cross-sectional view taken along line AA of 1(b). [Figure 7] 6 is an explanatory diagram showing a welding process for welding a first conductive wire to one end of a U-phase winding. FIG. [Figure 8] 13 is a perspective view showing a first conductive wire having a mountain-shaped protrusion and one end of a U-phase winding according to a second embodiment. FIG. [Figure 9] 13(a) to 13(c) are an axial end view, a front view, and a side view of one end of a first conductive wire in a second embodiment. [Figure 10] 13 is a perspective view showing a first conductive wire having a mountain-shaped protrusion and one end of a U-phase winding according to a third embodiment. FIG. [Figure 11] 13(a) to 13(c) are an axial end view, a front view, and a side view of one end of a first conductive wire in a third embodiment. [Figure 12] FIG. 13 is a perspective view showing a first conductive wire having a mountain-shaped protrusion and one end of a U-phase winding according to a fourth embodiment. [Figure 13] 13(a) to 13(c) are an axial end view, a front view, and a side view of one end of a first conductive wire in a fourth embodiment. [Figure 14] 13(a) and 13(b) are perspective views showing one end of a U-phase winding and one end of a first conductive wire before and after welding. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [First embodiment] Fig. 1 is a perspective view showing a rotating electric machine 1 according to a first embodiment of the present invention together with a terminal block 100. Figs. 2(a) and (b) are configuration diagrams of the rotating electric machine 1 and the terminal block 100 as viewed in the direction of the rotation axis and from the side. Fig. 2(b) shows the internal structure of the rotating electric machine 1 with a part cut away.

[0013] The rotating electric machine 1 is mounted on a vehicle as a driving source and a generator for running, and is connected to an inverter (not shown) via a terminal block 100. The rotating electric machine 1 has a three-phase motor 10 and a connection part 2, and windings 121-123 (described later) of the three-phase motor 10 and first to third washers 101-103 of the terminal block 100 are electrically connected by the connection part 2.

[0014] The three-phase motor 10 has a cylindrical motor case 11 with a bottom, a stator 12 housed in the motor case 11, a rotor 13 arranged inside the stator 12, a shaft 14 that passes through the center of the rotor 13 and is supported so as to be rotatable integrally with the rotor 13, and a cover member 15 made of molded resin that covers the opening of the motor case 11.

[0015] The stator 12 has U-phase, V-phase, and W-phase windings 121-123 wound around an annular stator core 120 surrounding the rotor 13. More specifically, any of the U-phase, V-phase, and W-phase windings 121-123 is wound around each of a plurality of teeth provided on the stator core 120. The stator core 120 is made of a magnetic material such as steel. The windings 121-123 are rectangular insulated electric wires in which an insulating coating layer made of enamel is formed on the outer circumferential surface of a conductor made of copper. The windings 121-123 are partly exposed from the cover member 15 to the outside of the motor case 11 and are molded into the cover member 15.

[0016] The rotor 13 has a cylindrical rotor core 131 with a through hole for inserting the shaft 14 therethrough, and a magnet 132 arranged on the outer periphery of the rotor core 131. The magnet 132 has a plurality of magnetic poles such that S poles and N poles are alternately positioned. The shaft 14 is rotatably supported by the motor case 11 via a bearing (not shown), and rotates about a rotation axis O. Hereinafter, the direction parallel to the rotation axis O will be referred to as the axial direction.

[0017] 3 is a circuit diagram showing a configuration example of an electric circuit in the three-phase motor 10 formed by the windings 121 to 123. The U-phase winding 121, the V-phase winding 122, and the W-phase winding 123 are each wound around the stator core 120 at multiple locations (six locations in the example shown in FIG. 3) to form a coil, and each is connected to a neutral point 12n at its center. A U-phase current is supplied to one end 121a and the other end 121b of the U-phase winding 121. A V-phase current is supplied to one end 122a and the other end 122b of the V-phase winding 122. A W-phase current is supplied to one end 123a and the other end 123b of the W-phase winding 123. One end portion 121a, 122a, 123a and the other end portion 121b, 122b, 123b of each of the windings 121 to 123 of each phase protrude from the cover member 15 in the axial direction.

[0018] Fig. 4(a) is a perspective view showing the connection part 2. The connection part 2 includes first to third connection terminals 21-23 connected to a terminal block 100, first to sixth conductive wires 31-36, and first to third molded resin parts 41-44 made of resin molded bodies. Fig. 4(b) is a perspective view showing the first to sixth conductive wires 31-36 without illustrating the first to third molded resin parts 41-44.

[0019] The first conductive wire 31 has one end connected to one end 121a of the U-phase winding 121 and the other end connected to the first connection terminal 21. The second conductive wire 32 has one end connected to the other end 121b of the U-phase winding 121 and the other end connected to the first connection terminal 21. The third conductive wire 33 has one end connected to one end 122a of the V-phase winding 122 and the other end connected to the second connection terminal 22. The fourth conductive wire 34 has one end connected to the other end 122b of the V-phase winding 122 and the other end connected to the second connection terminal 22. The fifth conductive wire 35 has one end connected to one end 123a of the W-phase winding 123 and the other end connected to the third connection terminal 23. The sixth conductive wire 36 has one end connected to the other end 123b of the W-phase winding 123, and the other end connected to the third connection terminal 23.

[0020] The connection between one end of the first and second conductive wires 31, 32 and one and the other ends 121a, 121b of the U-phase winding 121, the connection between one end of the third and fourth conductive wires 33, 34 and one and the other ends 122a, 122b of the V-phase winding 122, and the connection between one end of the fifth and sixth conductive wires 35, 36 and one and the other ends 123a, 123b of the W-phase winding 123 are performed by arc welding using aerial discharge. Details of this welding method will be described later.

[0021] The other ends of the first and second conductive wires 31, 32 are connected to the first connection terminal 21, the other ends of the third and fourth conductive wires 33, 34 are connected to the second connection terminal 22, and the other ends of the fifth and sixth conductive wires 35, 36 are connected to the third connection terminal 23 by crimping. The first connection terminal 21 is connected to a first washer 101 of the terminal block 100, the second connection terminal 22 is connected to a second washer 102 of the terminal block 100, and the third connection terminal 23 is connected to a third washer 103 of the terminal block 100 by bolts 110. The first to third washers 101 to 103 are connected to an inverter by wiring (not shown).

[0022] Fig. 5(a) and (b) are perspective views showing one end 121a of the U-phase winding 121 and one end of the first conductive wire 31 before and after welding. Fig. 6(a) to (c) are an axial end view, a front view, and a side view of one end of the first conductive wire 31. Fig. 6(d) is a cross-sectional view taken along line AA in Fig. 6(b). Although not shown in detail, one ends of the second to sixth conductive wires 32 to 36 are configured similarly to one end of the first conductive wire 31, and are welded to one ends 122a, 123a and the other ends 121b, 122b, 123b of the windings 121 to 123, respectively.

[0023] In the U-phase winding 121, a conductor portion 121M made of a highly conductive metal such as copper is covered with an insulating layer 121I made of an insulator such as enamel, and at one end 121a, the insulating layer 121I is removed to expose the conductor portion 121M. In the first conductive wire 31, a conductor portion 3M having a tapered angle-shaped projection 301 integrally therewith for generating an arc between the linear main body 30 and an electrode for arc welding, which will be described later, is covered with an insulating layer 3I except for both ends. The conductor portion 3M is made of a highly conductive metal such as copper, and the insulating layer 3I is made of an insulator such as enamel.

[0024] In the state before welding shown in Fig. 5(a), end 30a of main body 30 connected to U-phase winding 121 extends in an axial direction parallel to one end 121a of U-phase winding 121, and has a rectangular cross-sectional shape in a cross section perpendicular to the extension direction as shown in Fig. 6(d). End 30a of main body 30 is exposed from insulating layer 3I, and is in contact with conductor portion 121M of U-phase winding 121.

[0025] The angled protrusion 301 protrudes from the end 30a of the main body 30 along its extension direction. In this embodiment, the angled protrusion 301 is trapezoidal, and the width W1 (see FIG. 6(b)) in the long side direction in the cross section of the end 30a of the main body 30 becomes narrower toward the tip 301a. The width in the same direction at the base end 301b of the angled protrusion 301 is narrower than the width in the long side direction of the end 30a of the main body 30, and the angled protrusion 301 protrudes perpendicularly from the axial end face 30a1 of the end 30a. The tip 301a of the angled protrusion 301 protrudes in the axial direction beyond the end face 121a1 of one end 121a of the U-phase winding 121. This end face 121a1 is a plane perpendicular to the axial direction.

[0026] In this embodiment, the width W2 (see FIG. 6(c)) of the angled projection 301 in the short side direction of the end 30a of the main body 30 is constant over the entire length from the base end 301b to the tip end 301a.

[0027] Fig. 7 is an explanatory diagram showing a welding process for welding the first conductive wire 31 to one end 121a of the U-phase winding 121. This welding process is performed by arc welding, more specifically, by TIG (Tungsten Inert Gas) welding using an electrode made of tungsten and an inert gas. Fig. 7 shows a part of the welding head 5.

[0028] TIG welding is performed by placing a welding head 5 vertically above the angle-shaped protrusion 301 of the first conductive wire 31. The welding head 5 can be moved vertically by an actuator (not shown), and has a torch nozzle 51 that supplies inert gas G to the welding point, and a torch electrode 52 that protrudes downward from an opening 510 of the torch nozzle 51.

[0029] In this embodiment, a touch start method is adopted in which the torch electrode 52 is brought into contact with the tip 301a of the angle-shaped projection 301 to start current flow, and then the welding head 5 is moved upward to generate an arc discharge between the torch electrode 52 and the angle-shaped projection 301. The first conductive wire 31 is electrically grounded and serves as the cathode, and the torch electrode 52 serves as the anode. In FIG. 7, the arc A generated between the torch electrode 52 and the angle-shaped projection 301 is shown surrounded by a dashed line. The angle-shaped projection 301 melts due to the heat of the arc A and flows down.

[0030] This arc discharge causes the angle-shaped projection 301 to become the starting point for melting the conductor portion 3M, and as shown in Fig. 5(b), the end portion 30a of the main body 30 of the first conductive wire 31 is welded to one end portion 121a of the U-phase winding 121. This welded portion is then cooled and then coated with an insulating paint. The second to sixth conductive wires 32 to 36 may be TIG welded simultaneously with the first conductive wire 31, or may be TIG welded sequentially by one welding head 5.

[0031] (Functions and Effects of the First Embodiment) According to the first embodiment described above, arc A is generated concentrating on angled projection 301, which melts quickly. Then, part of end 30a of main body 30 also melts starting from angled projection 301, and welding to one end 121a of U-phase winding 121 is quickly performed. This also prevents insulating layers 3I, 121I from melting due to thermal conduction.

[0032] In addition, in this embodiment, arc A is generated when tip 301a of angle-shaped protrusion 301 is closer to torch electrode 52 than end face 121a1 of U-phase winding 121, so that arc A is concentrated at tip 301a of angle-shaped protrusion 301, causing angle-shaped protrusion 301 to melt more quickly.

[0033] In this embodiment, the case where the first conductive wire 31 is provided with the angled protrusion 301 has been described, but the U-phase winding 121 may also be provided with a similar angled protrusion. In this case, the angled protrusion protrudes in the axial direction from the end face 121a1 of one end 121a of the U-phase winding 121. Furthermore, when the U-phase winding 121 is provided with an angled protrusion, the angled protrusion 301 of the first conductive wire 31 may be omitted. That is, in the welding method according to this embodiment, it is sufficient that at least one of the pair of conductive members to be welded is provided with an angled protrusion. In the above example, the conductor portion 3M of the first conductive wire 31 and the conductor portion 121M of the U-phase winding 121 correspond to this pair of conductive members.

[0034] [Second embodiment] Next, a second embodiment of the present invention will be described with reference to Fig. 8 and Fig. 9. Fig. 8 is a perspective view showing a first conductive wire 31 having an angle-shaped projection 302 and one end 121a of a U-phase winding 121 according to the second embodiment. Figs. 9(a) to (c) are an axial end view, a front view, and a side view of one end of the first conductive wire 31 in this embodiment.

[0035] This embodiment is similar to the first embodiment except that the shape of the angled protrusion 302 is different from that of the angled protrusion 301 in the first embodiment, so the following description will focus on this difference, and the other parts will be given the same reference numerals as those used in the first embodiment, and redundant description will be omitted. The same applies to the third to fifth embodiments described later.

[0036] In the second embodiment, the angle projection 302 is triangular, and the width W1 in the long side direction in the cross section of the end 30a of the main body 30 gradually narrows from the base end 302b of the angle projection 302 toward the tip 302a. The width W1 at the base end 302b of the angle projection 302 is equal to the overall width in the long side direction at the end 30a of the main body 30. The width W2 of the angle projection 302 in the short side direction of the end 30a of the main body 30 is constant throughout from the base end 302b to the tip 302a. The tip 302a of the angle projection 302 protrudes in the axial direction beyond the end face 121a1 of one end 121a of the U-phase winding 121. The first conductive wire 31 and the U-phase winding 121 are connected by TIG welding, as in the first embodiment.

[0037] The second embodiment also provides the same functions and effects as the first embodiment.

[0038] [Third embodiment] Next, a third embodiment of the present invention will be described with reference to Figs. 10 and 11. Fig. 10 is a perspective view showing a first conductive wire 31 having an angle-shaped projection 303 and one end 121a of a U-phase winding 121 according to the third embodiment. Figs. 11(a) to (c) are an axial end view, a front view, and a side view of one end of the first conductive wire 31 in this embodiment. In Figs. 10 and 11(c), the central axis C of the end 30a of the main body 30 is indicated by a dashed line.

[0039] The shape of the angle-shaped projection 303 in the third embodiment is a triangle in which the width W2 in the short side direction at the end 30a of the main body 30 gradually narrows from the base end 303b toward the tip 303a. The tip 303a of the angle-shaped projection 303 is offset from the central axis C to one side in the short side direction corresponding to the U-phase winding 121 side. The width W1 of the angle-shaped projection 303 in the longitudinal direction of the end 30a of the main body 30 is constant. The tip 303a of the angle-shaped projection 303 protrudes in the axial direction beyond the end face 121a1 of the U-phase winding 121. The first conductive wire 31 and the U-phase winding 121 are connected by TIG welding, as in the first embodiment.

[0040] The third embodiment also provides the same effects and advantages as the first embodiment. In addition, since tip 303a of angled projection 303 is offset toward U-phase winding 121 from central axis C, melted angled projection 303 is more likely to flow toward end face 121a1 of U-phase winding 121.

[0041] [Fourth embodiment] Next, a fourth embodiment of the present invention will be described with reference to Figs. 12 and 13. Fig. 12 is a perspective view showing a first conductive wire 31 having an angle-shaped projection 304 and one end 121a of a U-phase winding 121 according to the fourth embodiment. Figs. 13(a) to (c) are an axial end view, a front view, and a side view of one end of the first conductive wire 31 in this embodiment. In Figs. 12 and 13(c), the central axis C of the end 30a of the main body 30 is indicated by a dashed line.

[0042] The shape of the angle-shaped projection 304 in the fourth embodiment is a pyramid shape in which the width W2 in the short side direction and the width W1 in the long side direction at the end 30a of the main body 30 gradually narrow from the base end 304b toward the tip 304a. The tip 304a of the angle-shaped projection 304 is offset from the central axis C to one side in the short side direction corresponding to the U-phase winding 121 side. The tip 304a of the angle-shaped projection 304 protrudes in the axial direction beyond the end face 121a1 of one end 121a of the U-phase winding 121. The first conductive wire 31 and the U-phase winding 121 are connected by TIG welding, as in the first embodiment.

[0043] This fourth embodiment also provides the same actions and effects as the first embodiment, and because tip 304a of angled projection 304 is offset toward U-phase winding 121 from central axis C, molten angled projection 304 is more likely to flow toward end face 121a1 of U-phase winding 121. Furthermore, because tip 304a of angled projection 304 is needle-like, the TIG welding arc is more likely to concentrate on tip 304a.

[0044] [Fifth embodiment] Next, a fifth embodiment of the present invention will be described with reference to Fig. 14. Figs. 14(a) and (b) are perspective views showing one end 121a of U-phase winding 121 before and after welding, and one end of first conductive wire 31 according to this embodiment.

[0045] In this embodiment, the angled protrusion 301 protrudes in a direction intersecting the extension direction of the main body 30. The main body 30 has an end 30a connected to the U-phase winding 121 bent so as to follow the circumferential direction of the stator 12, and the angled protrusion 301 is provided integrally with this end 30a. The angled protrusion 301 protrudes along the axial direction of the stator 12 in a direction intersecting the extension direction of the end 30a (the circumferential direction of the stator 12).

[0046] End 30a has a rectangular cross section perpendicular to its extension direction, and angled protrusion 301 protrudes from the end in the long side direction of this cross section. Tip 301a of angled protrusion 301 protrudes in the axial direction beyond end face 121a1 of one end 121a of U-phase winding 121.

[0047] The angle-shaped protrusion 301 becomes the starting point for melting the conductor portion 3M due to arc discharge, and as shown in Figure 14 (b), the end portion 30a of the main body 30 of the first conductive wire 31 and one end portion 121a of the U-phase winding 121 are welded together.

[0048] This fifth embodiment also provides the same effects and advantages as the first embodiment. Note that, although Fig. 14(a) shows the case where the angled protrusion 301 is formed in the same shape as the angled protrusion 301 according to the first embodiment, it may be formed in the same shape as the angled protrusions 302 to 304 according to the second to fourth embodiments.

[0049] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiment will be described by using the reference numerals and the like in the embodiment. However, the reference numerals and the like in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiment.

[0050] [1] A conductive wire (31-36) having, integrally with a linear body (30), a tapered angle-shaped protrusion (301-304) that generates an arc (A) between the conductive wire (31-36) and an arc welding electrode (52).

[0051] [2] The conductive wire (31-36) according to the above [1], wherein the angle-shaped projections (301-304) project from the end (30a) of the main body (30) along the extension direction of the end (30a).

[0052] [3] The conductive wire (31 to 36) according to [2] above, wherein the cross-sectional shape of the end (30a) of the main body (30) is rectangular in a cross section perpendicular to the extension direction, and the width (W1) of the angle-shaped protrusions (301, 302) in the long side direction in the cross section becomes narrower toward the tip ends (301a, 302a).

[0053] [4] The conductive wire (31-36) according to the above [2] or [3], wherein the cross-sectional shape of the end (30a) of the main body (30) is rectangular in a cross section perpendicular to the extension direction, and the width (W2) of the angle-shaped protrusions (303, 304) in the short side direction in the cross section becomes narrower toward the tip ends (302a, 304a).

[0054] [5] The conductive wire (31 to 36) according to the above [4], wherein the tip portion (302a, 304a) of each of the angle-shaped protrusions (303, 304) is offset to one side in the short side direction from the central axis (C) of the end portion.

[0055] [6] The conductive wire (31-36) according to the above [1], wherein the angle-shaped projection (301) projects in a direction intersecting with the extension direction of the main body (30).

[0056] [7] The conductive wire (31-36) according to [6] above, wherein the angle-shaped protrusion (301) is integrally formed on the end (30a) of the main body (30), the end (30a) has a rectangular cross-sectional shape in a cross section perpendicular to its extension direction, and the angle-shaped protrusion (301) protrudes from the end in the long side direction in the cross section.

[0057] [8] A welding method for welding a pair of conductive members (3M, 121M) by arc welding, wherein at least one of the pair of conductive members (3M, 121M) has a tapered angle-shaped protrusion (301-304), and an arc (A) is generated between the angle-shaped protrusion (301-304) and an electrode (torch electrode 52), melting the angle-shaped protrusion (301-304) to weld the pair of conductive members (3M, 121M).

[0058] [9] The welding method described in [8] above, wherein the angle-shaped protrusions (301-304) are provided on one of the pair of conductive members (3M, 121M), and during the welding, the arc (A) is generated in a state in which the tip portions (301a, 302a, 303a, 304a) of the angle-shaped protrusions (301-304) are closer to the electrode (52) than the end portion (121a) of the other conductive member (121M).

[0059]

[10] A method for manufacturing a rotating electric machine (1) including a rotor (13), a stator (12), windings (121-123) wound around the stator (12), and conductive wires (31-36) welded to ends (121a, 121b, 122a, 122b, 123a, 123b) of the windings (121-123), the method comprising the steps of: attaching tapered angled protrusions (301-304) to the conductive wires (31-36) to form linear bodies (31-36); 30) as a single unit with the windings (121-123), and while the main body (30) is in contact with the ends (121a, 121b, 122a, 122b, 123a, 123b) of the windings (121-123), an arc (A) is generated between the angle-shaped projections (301-304) and an electrode (52), thereby melting the angle-shaped projections (301-304) and welding the windings (121-123) to the conductive wires (31-36).

[0060] Although the embodiments of the present invention have been described above, the invention according to the claims is not limited to the embodiments described above. It should be noted that not all of the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

[0061] In addition, the present invention can be modified appropriately without departing from the spirit of the present invention. For example, in the above embodiment, the first to sixth conductive wires 31 to 36 are combined with the three-phase motor 10, but the present invention is not limited to this and can be applied to conductive wires used for various purposes. In addition, the welding method according to the present invention is not limited to welding a conductive wire and a winding, but can be applied to various objects in which a pair of conductive members are arc-welded. [Explanation of symbols]

[0062] 1...Rotary electric machine 12…Stator 121M…Conductor part (conductive material) 122~123…Winding 13...Rotor 30…Main body 31 to 36: First to sixth conductive wires 301~304…Angled protrusions 301a, 302a, 303a, 304a...Tip 3M: Conductor part (conductive material) 52...Torch electrode (electrode) A…Arc

Claims

1. A method for welding a pair of conductive members by arc welding, comprising: a tapered mountain-shaped protrusion is formed integrally with a linear body on one of the pair of conductive members; A torch electrode of a welding head is disposed vertically above the angled protrusion; bringing the main body into contact with an end of the other of the pair of conductive members and generating an arc between the angled projection and the torch electrode in a state in which the tip of the angled projection is closer to the torch electrode than the end face of the other conductive member; The arc melts the angled projection, and also melts a portion of the main body starting from the angled projection, thereby welding the pair of conductive members together. Welding method.

2. The mountain-shaped protrusion protrudes from the end of the main body along the extension direction of the end. The welding method according to claim 1.

3. The main body has a cross-sectional shape of the end portion perpendicular to the extension direction, the cross-sectional shape being rectangular, The width of the mountain-shaped protrusion in the long side direction in the cross section becomes narrower toward the tip. The welding method according to claim 2.

4. The main body has a cross-sectional shape of the end portion perpendicular to the extension direction, the cross-sectional shape being rectangular, The width of the mountain-shaped protrusion in the short side direction in the cross section becomes narrower toward the tip. The welding method according to claim 2 or 3.

5. The tip of the mountain-shaped protrusion is offset toward one side in the short side direction from the central axis of the end portion. The welding method according to claim 4.

6. The angled protrusion protrudes in a direction intersecting with the extension direction of the main body. The welding method according to claim 1.

7. The angled protrusion is integrally provided on an end of the body, The end of the main body has a rectangular cross-sectional shape in a cross section perpendicular to the extension direction thereof, The mountain-shaped protrusion protrudes from an end portion in a long side direction in the cross section. The welding method according to claim 6.

8. A manufacturing method for a rotating electric machine including a rotor, a stator, a winding wound around the stator, and a conductive wire welded to an end of the winding, comprising the steps of: A tapered mountain-shaped protrusion is formed integrally with a linear body of the conductive wire, a torch electrode of a welding head is disposed vertically above the angle-shaped projection of the conductive wire; contacting the body of the conductive wire with the end of the winding and generating an arc between the angled projection and the torch electrode with the tip of the angled projection closer to the torch electrode than the end face of the winding; The arc melts the angle-shaped projection, and also melts a part of the main body starting from the angle-shaped projection, thereby welding the winding and the conductive wire. A method for manufacturing a rotating electric machine.

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