stata

Abstract

To provide a stator that can keep an axial dimension of a stator core at a coil end part compact even when a lead wire part is provided including a radial extension part extending over the outside of a radial direction from the inside of the radial direction of the stator core along an axial end surface of the stator core.SOLUTION: In a stator 100, an end surface F1 on the side of a stator core 10 of a radial extension part 25c of a lead wire part 25 is arranged on the stator core 10 side (Z1 side) relative to an end surface F2 on the opposite side (Z1 side) to the stator core 10 of a plurality of top parts 24a over an outer side (R2 side) of a radial direction (R direction) from the inside (R1 side) of the radial direction (R direction) of a region AR where the radial extension part 25c of the lead wire part 25 and the plurality of top parts 24a are provided.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a stator.

Background Art

[0002] Conventionally, a stator including a lead wire portion having a conductor end portion connecting segment conductors to each other is known (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses a stator including a stator core and a coil unit (coil) to which a plurality of concentric coils (segment conductors) are connected. In the stator described in Patent Document 1, the coil unit includes a coil end portion disposed axially outside the axial end face of the stator core. The coil end portion includes a plurality of tops that are axial end portions of a portion folded back in the axial direction of the concentric coils, and a lead wire portion including a conductor end portion connecting the concentric coils to each other. The lead wire portion includes an end portion side portion extending from the radially inner side to the radially outer side of the stator core along the axial end face of the stator core. And, the end face on the stator core side of the end portion side portion of the lead wire portion is disposed on the opposite side of the stator core from the end face on the opposite side of the stator core of the plurality of tops across from the radially inner side to the radially outer side of the region where the end portion side portion of the lead wire portion and the plurality of tops are disposed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the stator described in Patent Document 1, the end face on the stator core side of the end portion (radial extension portion) of the lead wire section that extends from the radially inner to the radially outer side of the stator core is positioned on the opposite side of the stator core than the end faces of the multiple vertices opposite to the stator core, extending from the radially inner to the radially outer side. As a result, the distance between the end portion of the lead wire section and the axial end face of the stator core is relatively large. In other words, the axial dimension of the stator core at the coil end is relatively large. For this reason, even when a lead wire section including an end portion (radial extension portion) that extends from the radially inner to the radially outer side of the stator core along the axial end face of the stator core is provided, a stator is desired that can suppress the increase in the axial dimension of the stator core at the coil end.

[0006] This invention was made to solve the above-mentioned problems, and one object of this invention is to provide a stator that can suppress an increase in the axial dimension of the stator core at the coil end portion, even when a lead wire portion is provided that includes an end portion (radially extended portion) that extends from the radially inside to the radially outside of the stator core along the axial end face of the stator core. [Means for solving the problem]

[0007] To achieve the above objective, this invention 1The stator in this aspect comprises a stator core and a coil to which a plurality of segment conductors composed of rectangular wires are connected, the coil includes a coil end portion located axially outward from the axial end face of the stator core, the coil end portion includes a plurality of vertices which are the axial ends of the axially folded portions of the segment conductors and a lead wire portion including conductor ends that connect the segment conductors, the lead wire portion includes a radial extension portion that extends along the axial end face of the stator core from the radially inside of the stator core to the radially outside where the conductor ends are provided, the end face of the radial extension portion of the lead wire portion on the stator core side is located stator core side than the end face of the plurality of vertices opposite to the stator core, extending from the radially inside to the radially outside of the region where the radial extension portion of the lead wire portion and the plurality of vertices are provided. Furthermore, at least one of the corners of the lead wire portion on the stator core side and the corner opposite the top stator core is chamfered, and the stator core side end of the radial extension portion of the lead wire portion is sandwiched between adjacent ends opposite the top stator core, with the stator core side corner of the lead wire portion facing the corner opposite the top stator core. .

[0008] This invention 1In the stator in this configuration, as described above, the end face of the radially extended portion of the lead wire on the stator core side is positioned closer to the stator core than the end face of the multiple vertices opposite the stator core, extending from the radially extended portion of the lead wire and the region where the multiple vertices are provided, from the radially inside to the radially outside. This reduces the distance between the radially extended portion of the lead wire and the axial end face of the stator core compared to the case where the end face of the radially extended portion of the lead wire on the stator core side is positioned further away from the stator core than the end face of the multiple vertices opposite the stator core, extending from the radially extended portion of the lead wire and the region where the multiple vertices are provided, from the radially inside to the radially outside. As a result, even when a lead wire is provided that includes a radially extended portion extending along the axial end face of the stator core from the radially inside to the radially outside, it is possible to suppress an increase in the axial dimension of the stator core at the coil end. Furthermore, compared to the case where the end face of the radially extended portion of the lead wire on the stator core side is positioned on the opposite side of the stator core than the end face of the multiple tops opposite the stator core, extending from the radially inside to the radially outside of the region where the radially extended portion of the lead wire and the multiple tops are provided, the gap between the radially extended portion of the lead wire and the multiple tops can be reduced. As a result, adhesive materials such as varnish used to fix the coil end portion are more likely to remain between the radially extended portion of the lead wire and the multiple tops due to surface tension, thus allowing the radially extended portion of the lead wire and the multiple tops to be fixed more firmly. Furthermore, in order to achieve the above objective, a stator according to a second aspect of this invention comprises a stator core and a coil to which a plurality of segment conductors composed of flat rectangular wires are connected, the coil includes a coil end portion located axially outward from the axial end face of the stator core, the coil end portion includes a plurality of top portions which are the axial ends of the axially folded portions of the segment conductors and a lead wire portion which includes conductor ends that connect the segment conductors, the lead wire portion includes a radial extension portion which extends along the axial end face of the stator core from the radially inner side of the stator core to the radially outer side where the conductor ends are provided, the end face of the radial extension portion of the lead wire portion on the stator core side is the radial extension of the lead wire portion The lead wire portion extends from the radially inner to the radially outer side of the region where the long portion and multiple vertices are provided, and is positioned closer to the stator core than the end face of the multiple vertices opposite to the stator core. The radial extension portion of the lead wire portion is positioned to extend along the groove-like space between the vertices formed by the multiple vertices being aligned along the axial end face of the stator core. The multiple vertices are configured as rectangular flat conductors with a cross-section where the shorter side is in the direction along the axial end face of the stator core when viewed in the direction along the groove-like space, and the radial extension portion of the lead wire portion is configured as rectangular flat conductors with a cross-section where the longer side is in the direction along the axial end face of the stator core when viewed in the direction along the groove-like space. [Effects of the Invention]

[0009] According to the present invention, even when a lead wire portion is provided that includes a radially extended portion extending from the radially inner side to the radially outer side of the stator core along the axial end face of the stator core, as described above, it is possible to provide a stator that can suppress an increase in the axial dimension of the stator core at the coil end portion. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view showing a stator according to one embodiment of the present invention. [Figure 2] This is a perspective view showing the segment conductors of a coil in a stator according to one embodiment of the present invention. [Figure 3] This is a plan view showing the coil end portion of a coil in a stator according to one embodiment of the present invention. [Figure 4] This is a schematic cross-sectional view of the radially extended portion and multiple vertices of the lead wire section of a stator according to one embodiment of the present invention, viewed in the direction along the groove-shaped space (direction A in Figure 3). [Figure 5] This is a schematic cross-sectional view of a modified stator according to the present invention, showing the radially extended portion of the lead wire section and multiple vertices in a direction along the groove-shaped space. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to the drawings.

[0012] Referring to Figures 1 to 4, the configuration of stator 100 according to one embodiment of the present invention will be described.

[0013] In the following description, the axial, radial, and circumferential directions of the stator core 10 of the stator 100 will be referred to as the Z direction, R direction, and C direction, respectively. Furthermore, one side and the other side in the axial direction (Z direction) will be referred to as the Z1 side and the Z2 side, respectively. In addition, the inner side (inner diameter side) and the outer side (outer diameter side) in the radial direction (R direction) will be referred to as the R1 side and the R2 side, respectively.

[0014] As shown in Figure 1, the stator 100, together with a rotor (not shown) positioned on the R1 side of the stator 100 opposite the stator 100, constitutes part of an inner-rotor type rotating electric machine (not shown). The rotating electric machine is, for example, a motor, a generator, or a motor-generator.

[0015] The stator 100 includes a stator core 10 and a coil 20.

[0016] (Configuration of the stator core) The stator core 10 has a cylindrical shape with a central axis (not shown) along the Z direction as the central axis. The stator core 10 is formed by laminating a plurality of electromagnetic steel sheets (for example, silicon steel sheets) in the Z direction.

[0017] The stator core 10 includes an annular back yoke 11 and a plurality of teeth 12 protruding from the back yoke 11 toward the R1 side. Slots 13 are formed between the adjacent teeth 12 in the C direction. That is, the stator core 10 includes a plurality of slots 13.

[0018] (Configuration of the coil) The coil 20 includes a plurality of segment conductors 21. The coil 20 is configured by connecting a plurality of segment conductors 21. Each of the plurality of segment conductors 21 is composed of a copper wire. Each of the plurality of segment conductors 21 is composed of a flat conductor (see FIG. 4) having a rectangular cross section. The coil 20 is configured to generate a magnetic flux when three-phase alternating current power is supplied from a power supply unit (not shown).

[0019] As shown in FIG. 2, each of the plurality of segment conductors 21 includes a slot accommodating portion 22 and a coil end portion 23. As shown in FIG. 1, the slot accommodating portion 22 is accommodated in the slot 13. The coil end portion 23 is disposed outside the end face 10a in the axial direction (Z direction) of the stator core 10 in the axial direction (Z direction).

[0020] As shown in Figure 2, the coil end portion 23 includes a connecting portion 24 and lead wire portions 25 and 26. The connecting portion 24 connects slot housing portions 22 that are housed in different slots 13 (see Figure 1). The connecting portion 24 (coil end portion 23) includes a plurality of top portions 24a, which are the axial (Z-direction) ends of the portion of the segment conductor 21 that is folded back in the axial direction (Z-direction). The lead wire portions 25 and 26 each include conductor ends 25a and 26a that connect the segment conductors 21 to each other.

[0021] The conductor end 25a of lead wire section 25 is connected to the conductor end 26a of lead wire section 26 of another segment conductor 21. The conductor ends 25a and 26a are joined together and covered by an insulating covering member 30 (see Figure 3). The conductor ends 25a and 26a are located on the R2 side of lead wire sections 25 and 26, respectively. As shown in Figure 1, the insulating covering member 30 is located on the Z1 side of the end face 10a of the stator core 10. The conductor end 25a is located on the Z1 side of the conductor end 26a inside the insulating covering member 30.

[0022] As shown in Figure 2, the lead wire portion 25 includes an inner diameter portion 25b, a radial extension portion 25c, and a bent portion 25d. The inner diameter portion 25b is connected to the Z1 end of the slot housing portion 22. The inner diameter portion 25b is located on the R1 side of the coil end portion 23. The inner diameter portion 25b includes at least a portion extending in the Z direction. As shown in Figure 3, the radial extension portion 25c extends along the axial (Z direction) end face 10a of the stator core 10, from the inside (R1 side) in the radial direction (R direction) of the stator core 10 to the outside (R2 side) in the radial direction (R direction) where the conductor end portion 25a is provided. The bent portion 25d is bent at an angle of approximately 90 degrees from the direction along the Z direction to the direction along the R direction so as to connect the portion of the inner diameter portion 25b that extends in the Z direction with the radial extension portion 25c.

[0023] As shown in Figure 2, the lead wire portion 26 includes an outer diameter portion 26b, a radial extension portion 26c, and a bent portion 26d. The outer diameter portion 26b is connected to the Z1 side end of the slot housing portion 22. The outer diameter portion 26b is located on the R2 side of the coil end portion 23. The outer diameter portion 26b includes at least a portion that extends in the Z direction. The radial extension portion 26c extends along the end face 10a of the stator core 10 on the R2 side of the coil end portion 23, from the R1 side to the R2 side where the conductor end portion 26a is provided. The bent portion 26d is bent at an angle of approximately 90 degrees from the direction along the Z direction to the direction along the R direction so as to connect the portion of the outer diameter portion 26b that extends in the Z direction with the radial extension portion 26c.

[0024] As shown in Figure 3, the coil 20 is a coil in which multiple tops 24a are arranged along the axial (Z-direction) end face 10a (see Figure 1) of the stator core 10, with each of the multiple segment conductors 21 (see Figure 1) spanning multiple slots 13 (see Figure 1). In other words, the coil 20 is a distributed winding coil. In the figure, the coil 20 is shown as an example of a distributed winding coil, specifically a concentric winding coil. As a result, the multiple tops 24a are arranged along the axial (Z-direction) end face 10a of the stator core 10, making it easy to construct the radial extension portion 25c of the lead wire portion 25 and the region AR (described later) where the multiple tops 24a are provided.

[0025] (Detailed configuration of the coil end section) As shown in Figure 4, the end face F1 of the radially extended portion 25c of the lead wire portion 25 on the stator core 10 side is positioned on the stator core 10 side (Z2 side) than the end face F2 of the multiple tops 24a on the opposite side (Z1 side) from the stator core 10, extending from the inner side (R1 side) in the radial direction (R direction) to the outer side (R2 side) of the region AR (see Figure 3) where the radially extended portion 25c of the lead wire portion 25 and the multiple tops 24a are provided. Furthermore, as will be described later, the lead wire portion 25 is positioned so that the end face F1 of the radially extended portion 25c of the lead wire portion 25 on the stator core 10 side is aligned with the end face 10a (see Figure 1) of the stator core 10 (see Figure 1). Also, the connecting portion 24 is positioned so that the end face F2 of the multiple tops 24a on the opposite side (Z1 side) from the stator core 10 is aligned with the end face 10a of the stator core 10.

[0026] As a result, the distance between the end face F1 of the radially extended portion 25c of the lead wire portion 25 on the stator core 10 side (Z2 side) can be reduced compared to the case where the end face F1 of the radially extended portion 25c of the lead wire portion 25 on the stator core 10 side (Z1 side) extends from the inside (R1 side) in the radial direction (R direction) to the outside (R2 side) in the radial direction (R direction) of the region AR (see Figure 3) where the radially extended portion 25c of the lead wire portion 25 and the multiple tops 24a are located, and is positioned on the opposite side (Z1 side) of the stator core 10 than the end face F2 of the multiple tops 24a on the opposite side (Z1 side) of the stator core 10. As a result, even when a lead wire portion 25 is provided that includes a radial extension portion 25c extending along the axial (Z direction) end face 10a of the stator core 10 from the radial (R direction) inner side (R1 side) to the radial (R direction) outer side (R2 side) of the stator core 10, it is possible to suppress an increase in the axial (Z direction) dimension of the stator core 10 at the coil end portion 23.

[0027] Furthermore, compared to the case where the end face F1 of the radially extended portion 25c of the lead wire portion 25 on the stator core 10 side (Z2 side) extends from the inside (R1 side) in the radial direction (R direction) to the outside (R2 side) in the radial direction (R direction) of the region AR (see Figure 3) where the radially extended portion 25c of the lead wire portion 25 and the multiple tops 24a are located, and is positioned on the opposite side (Z1 side) from the stator core 10 than the end face F2 of the multiple tops 24a on the opposite side (Z1 side) from the stator core 10, the gap G between the radially extended portion 25c of the lead wire portion 25 and the multiple tops 24a can be reduced. As a result, adhesive materials such as varnish for fixing the coil end portion 23 are more likely to remain between the radially extended portion 25c of the lead wire portion 25 and the multiple tops 24a due to surface tension, thus more firmly fixing the radially extended portion 25c of the lead wire portion 25 and the multiple tops 24a.

[0028] As shown in Figure 3, the radial extension portion 25c of the lead wire portion 25 is arranged to extend along the groove-shaped space S between the multiple tops 24a, which are formed by the multiple tops 24a being aligned along the axial (Z-direction) end face 10a (see Figure 1) of the stator core 10. Specifically, the tops 24a are arranged in the R direction along the end face 10a of the stator core 10. Then, one set of tops 24a aligned in the R direction are arranged in the C direction along the end face 10a of the stator core 10. The portion of the connecting portion 24 other than the tops 24a is located on the Z2 side of the space between the tops 24a. Therefore, the continuous space between the multiple tops 24a forms a groove-shaped space S that extends along the end face 10a of the stator core 10. The radial extension portion 25c of the lead wire portion 25 is arranged to extend along the groove-shaped space S. As a result, compared to the case where the radial extension portion 25c of the lead wire portion 25 extends so as to intersect (cross the space S) with the groove-shaped space S between the top portions 24a, the end face F1 of the radial extension portion 25c of the lead wire portion 25 on the stator core 10 side can be easily positioned on the stator core 10 side (Z2 side) than the end face F2 of the multiple top portions 24a on the opposite side (Z1 side) from the stator core 10, extending from the inside (R1 side) in the radial direction (R direction) to the outside (R2 side) in the radial direction (R direction) of the region AR where the radial extension portion 25c of the lead wire portion 25 and the multiple top portions 24a are provided.

[0029] The radial extension portion 25c of the lead wire portion 25 is positioned to extend diagonally with respect to the radial direction (R direction) from the inside (R1 side) of the radial direction (R direction) to the outside (R2 side) of the radial direction (R direction), so as to intersect with the radial direction (R direction) when viewed in the axial direction (Z direction). Specifically, the top 24a in the nth column from the R1 side and the top 24a in the (n+1)th column from the R1 side are designated as the first and second tops, respectively. The top 24a in the (n+1)th column from the R1 side and the top 24a in the (n+2)th column from the R1 side, which are adjacent to the first and second tops on one side in the C direction, are designated as the third and fourth tops. The radial extension portion 25c of the lead wire portion 25 is arranged along a groove-shaped space S that extends diagonally with respect to the radial direction (R direction) due to the continuity of the space between the first and second tops and the space between the third and fourth tops. The end of the radial extension portion 25c of the lead wire portion 25 that is connected to the bent portion 25d on the R1 side, and the portion on the R2 side of region AR are arranged to extend in the R direction. As a result, in a configuration in which the radial extension portion 25c of the lead wire portion 25 is arranged to extend diagonally with respect to the radial direction (R direction) from the inside (R1 side) in the radial direction (R direction) to the outside (R2 side) in the radial direction (R direction), the end face F1 of the radial extension portion 25c of the lead wire portion 25 on the stator core 10 side can be positioned further toward the stator core 10 (Z2 side) than the end face F2 of the multiple tops 24a on the opposite side (Z1 side) from the stator core 10, across the region AR where the radial extension portion 25c of the lead wire portion 25 and the multiple tops 24a are provided, from the inside (R1 side) in the radial direction (R direction) to the outside (R2 side) in the radial direction (R direction).

[0030] As shown in Figure 4, the multiple vertices 24a are configured as rectangular flat wires with a cross-section where the shorter side is along the axial (Z-direction) end face 10a of the stator core 10 (see Figure 1) when viewed in the direction along the groove-shaped space S (direction A). In other words, the multiple vertices 24a are configured as rectangular flat wires with a cross-section where the shorter side is along the end face 10a of the stator core 10 and the longer side is along the Z-direction when viewed in direction A. This makes it possible to increase the width D between the multiple vertices 24a compared to the case where the multiple vertices 24a are configured as rectangular flat wires with a cross-section where the longer side is along the axial (Z-direction) end face 10a of the stator core 10 when viewed in the direction along the groove-shaped space S (direction A). As a result, the end E1 of the radially extended portion 25c of the lead wire portion 25 on the stator core 10 side (Z2 side) can be easily sandwiched between the ends E2 of adjacent tops 24a on the opposite side of the stator core 10 (Z1 side). In other words, the end face F1 of the radially extended portion 25c of the lead wire portion 25 on the stator core 10 side can be easily positioned on the stator core 10 side (Z2 side) of the multiple tops 24a, extending from the inside (R1 side) in the radial direction (R direction) to the outside (R2 side) in the radial direction (R direction) of the region AR (see Figure 3) where the radially extended portion 25c of the lead wire portion 25 and the multiple tops 24a are provided, compared to the end face F2 on the opposite side of the stator core 10 (Z1 side) of the multiple tops 24a.

[0031] The radially extended portion 25c of the lead wire 25 is configured as a rectangular flat wire with a cross-section where the longer side is along the axial (Z-direction) end face 10a (see Figure 1) of the stator core 10, when viewed in the direction along the groove-shaped space S (direction A). In other words, the radially extended portion 25c of the lead wire 25 is configured as a rectangular flat wire with a cross-section where the longer side is along the end face 10a of the stator core 10, and the shorter side is along the Z-direction, when viewed in direction A. This makes it possible to reduce the axial (Z-direction) dimension of the stator core 10 in the radially extended portion 25c of the lead wire 25 compared to the case where the radially extended portion 25c of the lead wire 25 is configured as a rectangular flat wire with a cross-section where the shorter side is along the axial (Z-direction) end face 10a of the stator core 10, when viewed in the direction along the groove-shaped space S (direction A).

[0032] The width W of the radially extended portion 25c of the lead wire section 25 is set to be larger than the distance D between the tops 24a that form the groove-shaped space S, when viewed in the direction along the groove-shaped space S (direction A). Specifically, when viewed in direction A, the length of the long side (width W) of the radially extended portion 25c of the lead wire section 25 is larger than the distance D between the tops 24a that form the groove-shaped space S. Furthermore, when viewed in direction A, the distance D is larger than the length of the short side (thickness t) of the radially extended portion 25c of the lead wire section 25.

[0033] On the other hand, at least one of the corner CR1 on the stator core 10 side (Z2 side) of the lead wire portion 25 and the corner CR2 on the opposite side of the top portion 24a from the stator core 10 (Z1 side) is chamfered. Specifically, at least one of the corner CR1 on the stator core 10 side (Z2 side) of the lead wire portion 25 and the corner CR2 on the opposite side of the top portion 24a from the stator core 10 (Z1 side) is chamfered into a round shape of a size that allows the end E1 on the stator core 10 side (Z2 side) of the radial extension portion 25c of the lead wire portion 25 to be sandwiched between the ends E2 on the opposite side of the stator core 10 (Z1 side) of adjacent top portions 24a.

[0034] Furthermore, the end E1 of the radial extension portion 25c of the lead wire portion 25 on the stator core 10 side (Z2 side) is sandwiched between the ends E2 on the opposite side (Z1 side) of adjacent top portions 24a, as the corner CR1 of the lead wire portion 25 on the stator core 10 side (Z2 side) is positioned opposite the corner CR2 of the top portion 24a on the opposite side (Z1 side) from the stator core 10. In other words, when viewed in direction A, a part of the radial extension portion 25c of the lead wire portion 25 is sandwiched between adjacent top portions 24a. Note that in Figure 4, the corner CR1 on the Z2 side of the lead wire portion 25 and the corner CR2 on the Z1 side of the top portion 24a are shown facing each other at a distance from each other, but the corner CR1 on the Z2 side of the lead wire portion 25 and the corner CR2 on the Z1 side of the top portion 24a may be in contact with each other.

[0035] As a result, even if the width W of the radially extended portion 25c of the lead wire portion 25 is greater than the distance D between the tops 24a that form the groove-shaped space S when viewed in the direction along the groove-shaped space S (direction A), at least one of the corner CR1 on the stator core 10 side (Z2 side) of the lead wire portion 25 and the corner CR2 on the opposite side of the top 24a from the stator core 10 (Z1 side) of the top 24a is chamfered, so that the end E1 on the stator core 10 side (Z2 side) of the radially extended portion 25c of the lead wire portion 25 can be sandwiched between the ends E2 on the opposite side of the stator core 10 (Z1 side) of adjacent tops 24a.

[0036] Both the corner CR1 on the stator core 10 side of the lead wire portion 25 and the corner CR2 on the opposite side (Z1 side) of the top portion 24a are chamfered into a rounded shape. This makes it possible to more reliably configure the end E1 on the stator core 10 side (Z2 side) of the radial extension portion 25c of the lead wire portion 25 to be sandwiched between the ends E2 on the opposite side (Z1 side) of adjacent top portions 24a. Note that the corner CR1 on the stator core 10 side of the lead wire portion 25 and the corner CR2 on the opposite side (Z1 side) of the top portion 24a are chamfered into a rounded shape so that they have approximately the same radius of curvature.

[0037] [Differentiation] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims rather than by the description of the embodiments above, and further includes all modifications (exceptions) within the meaning and scope equivalent to the claims.

[0038] For example, in the above embodiment, an example was shown in which multiple vertices 24a are configured as rectangular flat wires having a cross-section in which the shorter side is in the direction along the axial end face 10a of the stator core 10 when viewed in the direction along the groove-shaped space S (direction A), but the present invention is not limited to this. In the present invention, multiple vertices may be configured as rectangular flat wires having a cross-section in which the longer side is in the direction along the axial end face of the stator core when viewed in the direction along the groove-shaped space.

[0039] Furthermore, in the above embodiment, an example was shown in which the radially extended portion 25c of the lead wire portion 25 is configured as a rectangular flat conductor having a cross-section in which the direction along the axial end face 10a of the stator core 10 (Z direction) is the longer side when viewed in the direction along the groove-shaped space S (A direction), but the present invention is not limited to this. In the present invention, the radially extended portion of the lead wire portion may be configured as a rectangular flat conductor having a cross-section in which the direction along the axial end face of the stator core is the shorter side when viewed in the direction along the groove-shaped space.

[0040] Furthermore, in the above embodiment, an example was shown in which the radial extension portion 25c of the lead wire portion 25 is arranged to extend diagonally with respect to the radial direction (R direction) from the inside (R1 side) of the radial direction (R direction) to the outside (R2 side) of the radial direction (R direction) so as to intersect with the radial direction (R direction) when viewed in the axial direction (Z direction), but the present invention is not limited to this. In the present invention, the radial extension portion of the lead wire portion may be arranged to extend along the radial direction from the inside to the outside of the radial direction so as to intersect with the radial direction when viewed in the axial direction.

[0041] Furthermore, in the above embodiment, an example was shown in which both the corner CR1 on the stator core 10 side of the lead wire portion 25 and the corner CR2 on the opposite side (Z1 side) of the top portion 24a from the stator core 10 are chamfered into a round shape, but the present invention is not limited to this. In the present invention, either the corner on the stator core side of the lead wire portion or the corner on the opposite side of the stator core from the top portion may be chamfered into a round shape. Also, in the present invention, as shown in the modified example in Figure 5, both the corner CR1a on the stator core side of the lead wire portion and the corner CR2a on the opposite side of the stator core from the top portion may be chamfered into a straight line (C chamfer) at a 45-degree angle instead of a round shape (arc shape) chamfer (R chamfer).

[0042] Furthermore, in the above embodiment, the width W of the radially extended portion 25c of the lead wire portion 25 is set to be larger than the distance D between the tops 24a that form the groove-shaped space S when viewed in the direction along the groove-shaped space S (direction A), and at least one of the corner CR1 on the stator core 10 side (Z2 side) of the lead wire portion 25 and the corner CR2 on the opposite side of the top 24a from the stator core 10 (Z1 side) is chamfered. However, the present invention is not limited to this. In the present invention, the width of the radially extended portion of the lead wire portion may be set to be smaller than the distance between the tops that form the groove-shaped space when viewed in the direction along the groove-shaped space. In that case, both the corner on the stator core side of the lead wire portion and the corner on the opposite side of the top from the stator core are not required to be chamfered. [Explanation of Symbols]

[0043] 10…Stator core, 10a…End face (axially) of the stator core, 13…Slot, 20…Coil, 21…Segment conductor, 23…Coil end, 24a…Top, F1…End face (opposite the stator core at the top), CR1, CR1a…Corner (opposite the stator core at the top), E1…End (opposite the stator core at the top), 25, 26…Lead wire section, 25a, 26a…Conductor end, 25c…Radial extension section, F2…(Lead wire section) CR2, CR2a… End face of the radial extension portion on the stator core side, E2… End portion of the radial extension portion of the lead wire on the stator core side, AR… Region (where the radial extension portion of the lead wire and multiple vertices are provided when viewed in the axial direction), S… Groove-shaped space, 100… Stator, W… Width of the radial extension portion of the lead wire (viewed along the groove-shaped space), D… Spacing between vertices (viewed along the groove-shaped space)

Claims

1. Stator core and A coil comprising multiple segment conductors made of flat rectangular wires connected together, The coil includes a coil end portion that is positioned axially outward from the axial end face of the stator core. The coil end portion includes a plurality of tops which are the axial ends of the portion of the segment conductor that is folded back in the axial direction, and a lead wire portion which includes a conductor end that connects the segment conductors together. The lead wire portion includes a radial extension portion that extends along the axial end face of the stator core from the radially inner side of the stator core to the radially outer side where the conductor end is provided, The end face of the radially extended portion of the lead wire on the stator core side is positioned closer to the stator core than the end face of the multiple tops opposite to the stator core, extending from the radially extended portion of the lead wire and the region where the multiple tops are provided, from the radially inner side to the radially outer side. At least one of the corners of the lead wire portion on the stator core side and the corner of the top portion opposite to the stator core is chamfered. The stator is such that the end of the radially extended portion of the lead wire on the stator core side is sandwiched between adjacent ends on the opposite side of the stator core at the top of the lead wire, with the corner of the lead wire on the stator core side facing the corner of the top of the lead wire opposite to the stator core.

2. The stator according to claim 1, wherein the radially extended portion of the lead wire is arranged to extend along a groove-like space between the vertices formed by the plurality of vertices being aligned along the axial end face of the stator core.

3. The stator according to claim 2, wherein the width of the radially extended portion of the lead wire is set to be larger than the distance between the tops forming the groove-shaped space when viewed in the direction along the groove-shaped space.

4. The stator according to claim 1, wherein both the corner portion of the lead wire portion on the stator core side and the corner portion of the top portion opposite to the stator core are chamfered into a rounded shape.

5. The stator according to any one of claims 2 to 4, wherein the radially extended portion of the lead wire is arranged to extend from the inside of the radial direction to the outside of the radial direction in a direction oblique to the radial direction, so as to intersect the radial direction when viewed in the axial direction.

6. The plurality of vertices are configured as rectangular flat conductors having a cross-section in which the direction along the axial end face of the stator core is the shorter side when viewed in the direction along the groove-shaped space, The stator according to any one of claims 2 to 5, wherein the radially extended portion of the lead wire is configured as a rectangular flat conductor having a cross-section whose longer side is in the direction along the axial end face of the stator core when viewed in the direction along the groove-shaped space.

7. The stator core includes a plurality of slots, The stator according to any one of claims 1 to 6, wherein the coil is a coil in which the plurality of vertices are aligned along the axial end face of the stator core, by arranging the plurality of segment conductors with respect to the stator core such that each of the plurality of segment conductors spans the plurality of slots.

8. A stator core and A coil comprising multiple segment conductors made of flat rectangular wires connected together, The coil includes a coil end portion that is positioned axially outward from the axial end face of the stator core. The coil end portion includes a plurality of tops which are the axial ends of the portion of the segment conductor that is folded back in the axial direction, and a lead wire portion which includes a conductor end that connects the segment conductors together. The lead wire portion includes a radial extension portion that extends along the axial end face of the stator core from the radially inner side of the stator core to the radially outer side where the conductor end is provided, The end face of the radially extended portion of the lead wire on the stator core side is positioned closer to the stator core than the end face of the multiple tops opposite to the stator core, extending from the radially extended portion of the lead wire and the region where the multiple tops are provided, from the radially inner side to the radially outer side. The radially extended portion of the lead wire is arranged to extend along a groove-like space between the tops, which is formed when the multiple tops are aligned along the axial end face of the stator core. The plurality of vertices are configured as rectangular flat conductors having a cross-section in which the direction along the axial end face of the stator core is the shorter side when viewed in the direction along the groove-shaped space, The radially extended portion of the lead wire is configured as a rectangular flat conductor having a cross-section whose longer side is aligned with the axial end face of the stator core when viewed in the direction along the groove-shaped space, in a stator.

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