Rotating electric machine

Abstract

This rotating electric machine includes: a stator 20; a coil 22 composed of a flat wire and wound in a slot 24 of the stator 20; and power wiring 50 connected to the coil 22. A tip part 42 of the coil 22 protrudes in the axial direction from one end in the axial direction of the stator 20. The power wiring 50 has a twisted wire 51 and a flat plate-shaped connection terminal 52 connected to a tip of the twisted wire 51. The connection terminal 52 includes: a first joint part 151 to which the twisted wire 51 is joined; a second joint part 152 to which the tip part 42 is joined; and a connection part 153 that connects the first joint part 151 and the second joint part 152 in the axial direction. The surface of the twisted wire 51 joined to the first joint part 151 and the surface of the tip part 42 joined to the second joint part 152 are opposite to each other. The widthwise center of the twisted wire 51 joined to the first joint part 151 and the widthwise center of the tip part 42 joined to the second joint part 152 are offset in the width direction of the connection terminal 52.

Description

rotating electrical machines

[0001] The present invention relates to a rotating electric machine.

[0002] JP2004-048939A discloses a stator for a rotating electric machine in which a plurality of segment coils are inserted into slots, and ends of the segment coils are joined together by welding or the like to form a winding (coil).

[0003] In this configuration, when connecting a high-voltage wiring or the like having a connection terminal to the end of the coil, it is assumed that the connection terminal will be joined to the end of the coil in the axial direction by welding or the like. In this case, the space between the coil and the terminal is narrow. This reduces the space for the welding jig, making it difficult to perform the welding work and potentially reducing the reliability of the joint.

[0004] The present invention has been made in view of the above problems, and has an object to provide a rotating electric machine that can more reliably join the stator coil and the power wiring.

[0005] One aspect of the present invention is applied to a rotating electric machine including a stator, a coil made of a rectangular wire wound in a slot of the stator, and power wiring connected to the coil. The coil has a tip end that protrudes axially from one axial end of the stator. The power wiring includes a stranded wire and a flat connection terminal connected to the tip end of the stranded wire. The connection terminal has a first joint portion to which the stranded wire is joined, a second joint portion to which the tip end of the coil is joined, and a connecting portion that axially connects the first joint portion to the second joint portion. The surface of the stranded wire joined to the first joint portion and the surface of the tip end joined to the second joint portion are opposite each other, and the widthwise center of the stranded wire connected to the first joint portion and the widthwise center of the tip end joined to the second joint portion are offset in the width direction of the connection terminal.

[0006] FIG. 1 is a perspective view of a stator of a rotating electric machine of this embodiment. FIG. 2 is an enlarged view of a main portion of the stator of a drive device. FIG. 3 is an explanatory diagram of a connection terminal. FIG. 4 is an explanatory diagram of a connection terminal. FIG. 5 is an explanatory diagram of a connection terminal of a modified example. FIG. 6 is an explanatory diagram of a connection terminal of another modified example. FIG. 7 is an explanatory diagram of a connection terminal of yet another modified example. FIG. 8 is an explanatory diagram of a connection terminal of yet another modified example. FIG. 9 is an explanatory diagram of a connection terminal of yet another modified example. FIG. 10 is an explanatory diagram of a rotating electric machine of yet another modified example. FIG. 11 is an explanatory diagram of a rotating electric machine of yet another modified example.

[0007] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0008] Fig. 1 is an explanatory diagram of a rotating electrical machine 1 according to this embodiment, and is a perspective view of one axial end side of a stator 20. Fig. 2 is a perspective view of a main part of the stator 20, focusing on a power wiring 50.

[0009] 1, a rotating electric machine (motor) 1 includes an annular stator 20, and is configured by inserting coils 22 into a plurality of slots 24 formed in the stator 20. When power is supplied to the coils 22, the stator 20 rotates a rotor (not shown) that is installed inside the stator 20.

[0010] The rotating electric machine 1 is mounted on an electric vehicle and functions as an electric motor that drives the wheels. When the electric vehicle decelerates, the rotating electric machine 1 also functions as a generator that generates regenerative power. Note that the rotating electric machine 1 may also be used as a drive device for devices other than automobiles, such as various electrical appliances or industrial machines.

[0011] The stator 20 is made up of a ring-shaped stator core 21 and a coil 22. The stator core 21 has a plurality of teeth 23 protruding toward the inner periphery and slots 24 which are spaces between adjacent teeth 23. The coil 22 is made up of a plurality of segment coils 40.

[0012] The segment coils 40 are formed by bending rectangular wires made of conductive metal such as copper, and have an insulating coating on their surfaces. The segment coils 40 extend from one end of the stator core 21 to the other end along the slots 24, and then are folded back from the other end to the one end, forming a so-called hairpin shape.

[0013] One end of the segment coil 40 has a tip portion 42 that protrudes linearly in the axial direction from one end of the stator core 21. The multiple tip portions 42 protruding from one end of the stator core 21 form a coil end 25. At the other end of the stator core 21, a folded portion of the segment coil 40 forms a coil end 26.

[0014] Adjacent tip portions 42 are joined together at one end of the stator core 21, thereby electrically integrating the multiple segment coils 40 inserted into the slots 24. The coils 22 are made up of electrically independent U-phase, V-phase, and W-phase, each of which is formed by connecting multiple segment coils 40 together.

[0015] The tip ends 42 of the segment coils 40 are joined together by welding (e.g., laser welding).

[0016] Power wiring 50 is connected to the tip 42 of a predetermined segment coil 40. The power wiring 50 is connected to a power conversion device 60 (see FIG. 10 ) and transmits and receives power between the coil 22 and the power conversion device 60. The power wiring 50 is made up of U-phase wiring 50U, V-phase wiring 50V, and W-phase wiring 50W, each of which is joined to the tip 42 of the corresponding segment coil 40.

[0017] The power wiring 50 is composed of a twisted wire 51 and a connection terminal 52 connected to the tip of the twisted wire 51. The twisted wire 51 is made of a plurality of conductive thin wires twisted together and has an insulating coating on its outside. The connection terminal 52 is made of a thin plate of conductive metal and is a terminal that joins the twisted wire 51 and the tip 42.

[0018] The connection terminal 52 and the tip portion 42 are joined by welding, similar to the joining of the tip portions 42 to each other.

[0019] Next, a method for assembling the stator 20 configured as described above will be described.

[0020] First, as shown in FIG. 1, a plurality of segment coils 40 are inserted into the slots 24 of the stator core 21 in a predetermined arrangement.

[0021] Next, adjacent tip portions 42 are joined by welding at one end of the stator core 21. Specifically, with the segment coils 40 inserted into each slot 24, the tip surfaces (indicated by A in FIG. 2 ) of adjacent tip portions 42 are arranged flush with each other. In this state, a laser welding jig is brought close to adjacent locations of the tip surfaces A, and the tip surfaces A are welded together by heat from the laser light. At this time, the insulating coating near the tip portions 42 is melted and evaporated by the heat, and the tip surfaces A of the tip portions 42 are welded together at their adjacent locations.

[0022] Next, the connection terminal 52 is fixed adjacent to the tip portion 42 to which the power wiring 50 is joined. With the tip surface (indicated by B in FIG. 2 ) of the connection terminal 52 and the tip surface A of the tip portion 42 flush with each other, laser welding is performed in the same manner. As a result, the tip surface B of the connection terminal 52 and the tip surface A of the tip portion 42 are welded at the adjacent location.

[0023] In this manner, the stator 20 is constructed.

[0024] When welding the connection terminal 52 to the tip portion 42, as shown in Fig. 3, a laser welding jig T is brought close to the tip surface B of the connection terminal 52 and the tip surface A of the tip portion 42 along the axial direction of the rotating electric machine 1. Because the connection terminal 52 has a plate shape that has a width in the circumferential direction of the stator 20, depending on the shape of the connection terminal 52, the jig T may be obstructed by the connection terminal 52 and may not be able to approach the contact point sufficiently. In this case, there is a risk that the reliability of the connection terminal 52 joint may be reduced.

[0025] Therefore, in this embodiment, the reliability of the joining of the connection terminals 52 is increased by the following configuration.

[0026] FIG. 3 is a front view of the connection terminal 52 of the power wiring 50, and FIG. 4 is a side view of the connection terminal 52 of the power wiring 50. As shown in FIG.

[0027] The connection terminal 52 is composed of a first joint portion 151 to which the twisted wire 51 is joined, a second joint portion 152 to which the tip portion 42 of the segment coil 40 (coil 22) is joined, and a linking portion 153 that longitudinally links the first joint portion 151 and the second joint portion 152. The linking portion 153 is formed narrower than the first joint portion 151 and the second joint portion 152, and forms a constricted portion of the connection terminal 52.

[0028] The first joint portion 151 is a flat portion located on the axially outer side of the connection terminal 52. Before the connection terminal 52 is joined to the stator 20, the stranded wire 51 is joined to the first joint portion 151 in advance by crimp welding so as to be electrically conductive.

[0029] The second joint portion 152 is a flat plate-shaped portion located axially inward of the first joint portion 151 in the connection terminal 52. The second joint portion 152 has extension portions 154, 154 that extend outward in the width direction of the connection terminal 52, and protrusions 155, 155 that protrude axially outward from the ends of the extension portions 154, 154. The protrusions 155 have a tip surface B on the axially outer side that is flush with the tips of the tip portions 42. Adjacent locations (indicated by circles in FIG. 4 ) of the tip surface B of each protrusion 155 and the tip surface A of a pair of tip portions 42 are joined by laser welding.

[0030] The connecting portion 153 is a flat plate-shaped portion located between the first joint portion 151 and the second joint portion 152. The connecting portion 153 connects the first joint portion 151 and the second joint portion 152 in series in the axial direction.

[0031] 3 , the widthwise center S of the stranded wire 51 connected to the first joint portion 151 (the center of the connection terminal 52) and the widthwise center F of the tip portion 42 joined to the extension portion 154 of the second joint portion 152 are positioned at positions offset in the width direction of the connection terminal 52. That is, in the connection terminal 52, the extension portion 154 to which the tip portion 42 is joined is located at a position offset in the width direction (circumferential direction of the stator 20) from the center of the connection terminal 52. Furthermore, the second joint portion 152 is configured to be wider than the first joint portion 151. It is preferable that the widthwise center F of the tip portion 42 joined to the extension portion 154 be configured to be located outside both widths of the first joint portion 151.

[0032] As shown in FIG. 4, the surface of the connection terminal 52 to which the twisted wire 51 is joined and the surface to which the tip 42 of the segment coil 40 is joined are opposite sides.

[0033] In this way, since the connection terminal 52 has a narrowed portion and is offset by the extension portion 154, making it wider than the first joint portion 151, when the connection terminal 52 is joined to the tip portion 42 of the segment coil 40, as shown in Figure 3, the laser welding jig T is less likely to interfere with the connection terminal 52.

[0034] Furthermore, as shown in Figure 4, the tip portion 42 is joined to the extension portion 154 of the connection terminal 52 on the side opposite to the surface where the stranded wire 51 of the connection terminal 52 is joined, so the laser welding jig T is less likely to interfere with the connection terminal 52.

[0035] As described above, this embodiment is configured as a rotating electric machine including the stator 20, the coil 22 made of rectangular wire and wound in the slot 24 of the stator 20, and the power wiring 50 connected to the coil 22. The segment coil 40 (coil 22) has a tip portion 42 that protrudes axially from one axial end of the stator 20. The power wiring 50 has a stranded wire 51 and a flat connection terminal 52 connected to the tip portion of the stranded wire 51. The connection terminal 52 has a first joint 151 to which the stranded wire 51 is joined, a second joint 152 to which the tip portion 42 is joined, and a connecting portion 153 that axially connects the first joint 151 and the second joint 152. The surface of the stranded wire 51 joined to the first joint 151 is opposite to the surface of the stranded wire 51 to which the tip portion 42 is joined to the second joint 152. The widthwise center of the stranded wire 51 connected to the first joint portion 151 and the widthwise center of the tip portion 42 joined to the second joint portion 152 are offset in the width direction of the connection terminal 52 .

[0036] In this configuration, the tip 42 is joined at a position offset from the center of the connection terminal 52, and the tip 42 is joined on the side opposite to the surface of the connection terminal 52 where the stranded wire 51 is joined, so that the laser welding jig T is less likely to interfere with the connection terminal 52. This allows for more reliable welding between the connection terminal 52 and the tip 42.

[0037] In this embodiment, the connecting portion 153 is narrower than the first joint portion 151 and the second joint portion 152 , and is configured as a constricted portion of the connection terminal 52 .

[0038] In this configuration, when the connection terminal 52 is joined to the tip portion 42, the presence of the constricted portion makes it less likely that the laser welding jig T will interfere with the connection terminal 52.

[0039] In this embodiment, the second joint portion 152 has an extension portion 154 that extends outward in the width direction beyond the connecting portion 153 , and the tip portion 42 is joined to the extension portion 154 .

[0040] In this configuration, the extension portion 154 causes the joining position of the tip portion 42 to be significantly offset from the center of the connection terminal 52, thereby more reliably suppressing interference between the laser welding jig T and the connection terminal 52.

[0041] In this embodiment, the extension portions 154 are formed to extend outward from both sides of the second joint portion 152 in the width direction.

[0042] In this configuration, even when two tip portions 42 are joined to the connection terminal 52, the joining position of the tip portions 42 can be offset from the center of the connection terminal 52, thereby avoiding interference between the laser welding jig T and the connection terminal 52.

[0043] In this embodiment, the extension portion 154 has a protrusion 155 that protrudes in the axial direction parallel to the connecting portion 153 , and the tip portion 42 is joined to the protrusion 155 .

[0044] 2, this configuration makes it easy to detect, by a camera or the like, that the tip surface A of the tip portion 42 and the tip surface B of the connection terminal 52 are adjacent to each other, and to control the robot to move the laser welding jig T to this adjacent location, thereby improving the efficiency of the welding process.

[0045] Next, a modification of this embodiment will be described.

[0046] FIG. 5 is a front view of a connection terminal 52 according to a modification of this embodiment.

[0047] 5 differs from the connection terminal 52 shown in Fig. 3 in that it does not have a protrusion 155 at the end of the extension 154. The other configurations are the same.

[0048] 1 to 4, when connecting terminal 52 is joined to coil 22, tip surface B of protrusion 155 formed on extension 154 of connecting terminal 52 is adjacent to tip surface A of tip portion 42, as shown in Fig. 2. For example, this state can be detected by a camera and a robot can be controlled to move laser welding jig T to this location, thereby improving the efficiency of welding.

[0049] On the other hand, if such control is not necessary, as shown in Fig. 5, the formation of the protrusion 155 on the extension 154 of the connection terminal 52 may be omitted, and the axially outer surface of the extension 154 may be configured as the tip surface B. In this configuration, the shape of the outer peripheral surface of the connection terminal 52 becomes simpler, which improves the yield when forming it by, for example, pressing, and reduces costs.

[0050] FIG. 6 is a front view of a connection terminal 52 according to another modified example of this embodiment.

[0051] The modified example shown in Fig. 6 differs from the connection terminal 52 shown in Fig. 3 in that an extension portion 154 is formed only on one side in the width direction of the second joint portion 152. The other configurations are the same.

[0052] The connection terminal 52 shown in Figure 6 is different from the configuration described in Figures 1 to 4 and has a configuration used when joining the connection terminal 52 to the tip portion 42 of one segment coil 40.

[0053] 1 to 4, in this configuration, the connection terminal 52 has a constricted portion and is offset by the extension portion 154, so that the laser welding jig T is less likely to interfere with the connection terminal 52 when joining the connection terminal 52 to the tip end portion 42 of the segment coil 40. This allows for more reliable welding at the contact point between the tip end surface B of the connection terminal 52 and the tip end surface A of the tip end portion 42.

[0054] FIG. 7 is a front view of a connection terminal 52 according to yet another modification of the present embodiment.

[0055] The modified example shown in Fig. 7 is a modified example of the connection terminal 52 shown in Fig. 6, and is different from the configuration described in Fig. 5 in that it does not have the protrusion 155 at the end of the extension portion 154. The other configurations are the same as those in Fig. 6.

[0056] In this way, by omitting the formation of the protrusion 155 on the extension portion 154 of the connection terminal 52 and configuring the axial outer surface of the extension portion 154 as the tip surface B, the yield when forming it by pressing, for example, can be improved and costs can be reduced.

[0057] FIG. 8 is a front view of a connection terminal 52 according to yet another modification of the present embodiment.

[0058] The modified example shown in Fig. 8 differs from the connection terminal 52 shown in Fig. 3 in that it has a first flange portion 161 that extends axially outward from the first joint portion 151. The other configurations are the same.

[0059] As shown in FIG. 8 , the first joint portion 151 of the connection terminal 52 includes a pair of first flange portions 161, 161 extending axially outward on both sides of the first joint portion 151 in the width direction. The first flange portions 161, 161 are each formed to rise toward the surface of the first joint portion 151 to which the stranded wire 51 is joined in the plate thickness direction. The stranded wire 51 is located in the space between these first flange portions 161, 161. The first flange portions 161 are configured to extend along the stranded wire 51 in the extension direction (axial direction) of the stranded wire 51 and in the radial direction (standing direction) of the stranded wire 51. The rising height of the first flange portions 161 is formed to be lower than the height of the stranded wire 51 joined to the first joint portion 151.

[0060] By providing the first flange portion 161 at the first joint portion 151 of the connection terminal 52, the volume and surface area of ​​the connection terminal 52 are increased, and the heat dissipation properties of the first joint portion 151 can be improved.

[0061] In particular, because the connection terminal 52 has a structure that reduces in the width direction at the constricted portion, heat concentrates at this location when power is flowing. Therefore, by providing the first flange portion 161 and increasing the volume and surface area of ​​the connection terminal 52, it is possible to avoid heat concentration at the constricted portion and to moderate the temperature rise. The first flange portion 161 is formed by a bending process after pressing during the manufacturing process of the connection terminal 52, so the increase in cost when forming the first flange portion 161 is minimized.

[0062] In this way, the first joint portion 151 has first flange portions 161 that extend axially from the first joint portion 151 and rise from both widthwise sides toward the surface to which the stranded wire 51 is joined. By providing the first flange portions 161 and increasing the volume and surface area of ​​the connection terminal 52, it is possible to avoid heat concentration in the constricted portion, slow down the temperature rise, and improve the heat dissipation properties of the first joint portion 151.

[0063] 1 to 4, the laser welding jig T is less likely to interfere with the connection terminal 52. This allows for more reliable welding at the contact points between the tip surface B of the connection terminal 52 and the tip surface A of the tip portion 42.

[0064] FIG. 9 is a front view of a connection terminal 52 according to yet another modification of the present embodiment.

[0065] The modified example shown in Fig. 9 differs from the connection terminal 52 shown in Fig. 8 in that it has second flange portions 162 on both widthwise sides of the linking portion 153. The other configurations are the same as those in Fig. 8.

[0066] As shown in Figure 9, the connecting portion 153 of the connection terminal 52 has second flange portions 162, 162 on both sides of its width direction, which are formed to rise toward the surface side to which the twisted wire 51 is joined in the plate thickness direction of the connecting portion 153.

[0067] The rising height of the second flange portion 162 is formed to be lower than the height of the stranded wire 51 joined to the first joint portion 151, similar to the first flange portion 161 described above.

[0068] In this way, the linking portion 153 of the connection terminal 52 has second flange portions 162 that rise from both sides in the width direction toward the surface to which the stranded wire 51 is joined. By providing the second flange portions 162 at the linking portion 153, which is the portion most likely to generate heat, and increasing the volume and surface area of ​​this portion, it is possible to avoid heat concentration at the constricted portion, make the temperature rise more gradual, and also improve the heat dissipation properties of the first joining portion 151.

[0069] 8, by providing second flange portion 162 at connecting portion 153, which is the portion most susceptible to heat generation, and increasing the volume and surface area of ​​this portion, it is possible to avoid heat concentration at the constricted portion and to moderate the temperature rise. Furthermore, since second flange portion 162 is also formed by a bending process after press working in the manufacturing process of connection terminal 52, the increase in cost when forming second flange portion 162 is minimized.

[0070] The connection terminal 52 may include both the first flange portion 161 described with reference to FIG. 7 and the second flange portion described with reference to FIG.

[0071] FIG. 10 is an explanatory diagram of a rotating electrical machine 1 according to yet another modified example of this embodiment.

[0072] The modification shown in FIG. 10 relates to the configuration of the power wiring 50 laid between the power conversion device 60 and the coil 22 of the stator 20 .

[0073] 10 , the power converter 60 is disposed at one end of the stator 20 and spaced apart in the axial direction. The power wiring 50 is routed linearly in the axial direction between the power converter 60 and the stator 20. Furthermore, the connection terminal 52 of the power wiring 50 has a twisted wire 51 joined to its front side (upper surface) and a tip end 42 of the segment coil 40 joined to its back side (lower surface).

[0074] 3, the connection terminal 52 is joined by laser welding at the adjacent portion between the tip surface B of the protrusion 155 and the tip surface A of the tip portion 42. Although the connection terminal 52 and the tip portion 42 are stacked one above the other along the axial direction as shown in FIG. 4, the only welding location is the adjacent portion between the tip surface B of the connection terminal 52 and the tip surface A of the tip portion 42, which is indicated by a circle, and is a so-called cross-welding.

[0075] In such a bow welding, the structure is not strong enough to withstand forces acting in the direction of separating the connection terminal 52 and the tip portion 42, so if a large force is applied due to vibration of the rotating electric motor 1, etc., there is a possibility that defects will occur at the welded point.

[0076] Therefore, by routing the power wiring 50 in a straight line from the power converter 60 toward the stator 20 as shown in FIG. 10, the gravity of the stranded wire 51 acts in a direction that brings the connection terminal 52 and the tip 42 into close contact with each other.

[0077] In this manner, the power converter 60 is disposed at one end of the stator 20 at a distance in the axial direction, and the power wiring 50 is routed linearly in the axial direction between the power converter 60 and the stator 20. The connection terminal 52 has the stranded wire 51 joined to its upper surface and the tip portion 42 joined to its lower surface.

[0078] Therefore, even when force is applied to the connection terminal 52 due to vibration or the like, the connection terminal 52 and the tip portion 42 are always biased in a direction in which they come into close contact with each other, thereby suppressing defects from occurring at the welded portion.

[0079] FIG. 11 is an explanatory diagram of a rotating electrical machine 1 according to yet another modified example of this embodiment.

[0080] In the modified example shown in FIG. 11 , the power wiring 50 is arranged so as to be curved between the power converter 60 and the coil 22 of the stator 20 , as compared with the configuration shown in FIG. 10 .

[0081] As shown in Figure 11, the power converter 60 is arranged at one end of the stator 20, spaced apart in the axial and radial directions. The power wiring 50 extends axially from the power converter 60 between the power converter 60 and the stator 20, and is then curved radially toward the stator 20. As described in Figure 10, the connection terminal 52 of the power wiring 50 has the stranded wire 51 joined to its front surface (upper surface) and the tip 42 of the segment coil 40 joined to its back surface (lower surface).

[0082] In this way, by routing the power wiring 50 in a curved manner from the power converter 60 toward the stator 20, the reaction force due to the springback of the stranded wire 51 acts in a direction that brings the connection terminal 52 and the tip 42 into close contact with each other.

[0083] Therefore, even when force is applied to the connection terminal 52 due to vibration or the like, the reaction force caused by the springback of the stranded wire 51 always biases the connection terminal 52 and the tip 42 in a direction in which they come into close contact with each other, thereby further suppressing defects at the welded portion.

[0084] Although the embodiments of the present invention have been described above, the above embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above embodiments.

Claims

1. A rotating electric machine comprising a stator, a coil made of rectangular wire wound in a slot of the stator, and power wiring connected to the coil, wherein the tip of the coil protrudes axially from one axial end of the stator, the power wiring has a stranded wire and a flat connection terminal connected to the tip of the stranded wire, the connection terminal has a first joint to which the stranded wire is joined, a second joint to which the tip of the coil is joined, and a linking part that axially links the first joint and the second joint, the surface of the stranded wire joined to the first joint and the surface of the tip to be joined to the second joint are opposite sides, and the widthwise center of the stranded wire connected to the first joint and the widthwise center of the tip to be joined to the second joint are offset in the width direction of the connection terminal.

2. A rotating electric machine according to claim 1, wherein the connecting portion is narrower than the width of the first joint portion and the width of the second joint portion, and is configured as a constricted portion of the connection terminal.

3. A rotating electric machine according to claim 2, wherein the second joint portion has an extension portion extending outward in the width direction from the connecting portion, and the tip portion is joined to the extension portion.

4. A rotating electric machine according to claim 3, wherein the extension portions are formed by extending outward from both sides of the connecting portion in the width direction.

5. A rotating electric machine according to claim 3, wherein the extension portion has a protruding portion that protrudes in the axial direction parallel to the connecting portion, and the tip portion is joined to the protruding portion.

6. A rotating electric machine according to claim 1, wherein the first joint portion has first flange portions extending in the axial direction from the first joint portion and rising from both sides in the width direction toward the surface to which the stranded wire is joined.

7. A rotating electric machine according to claim 1, wherein the connecting portion has second flange portions that rise from both sides in the width direction toward the surface to which the stranded wires are joined.

8. A rotating electric machine according to claim 1, wherein the power wiring is connected to a power conversion device that supplies power to the coils, the power conversion device is arranged at an axial distance from one end of the stator, the power wiring is routed in a straight line in the axial direction between the power conversion device and the stator, and the twisted wire is joined to the upper surface of the connection terminal, and the tip end is joined to the lower surface of the connection terminal.

9. A rotating electric machine as claimed in claim 1, wherein the power wiring is connected to a power conversion device that supplies power to the coils, the power conversion device is arranged radially spaced apart from the one end of the stator, the power wiring extends axially from the power conversion device and is then curved radially toward the stator, and the twisted wire is joined to the upper surface of the connection terminal and the tip end is joined to the lower surface of the connection terminal.

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