stator

Abstract

The present invention relates to a stator. In the stator, a first engaging portion is provided which is provided in a manner extending in a radial direction as viewed from a rotational axis direction; and a second engaging portion is provided which is provided at a position corresponding to a fastening member and is provided in a manner extending in the rotational axis direction so as not to overlap the fastening member.

Description

Technical Field

[0001] This invention relates to stators. Background Technology

[0002] Previously, it was known that stators had a stator core with fastening holes for fastening components to be inserted. For example, such a stator was disclosed in Japanese Patent Application Publication No. 2017-50937.

[0003] In the stator described in Japanese Patent Application Publication No. 2017-50937, fastening holes (bolt holes) are provided on the outer periphery of the stator core. Bolts (fastening components) are inserted into these fastening holes, thereby mounting the stator to a motor housing or the like. Furthermore, multiple concentrically wound coils are mounted in slots in the stator. The concentrically wound coils are formed by concentrically winding flat conductors. Additionally, lead portions are provided at the start and end ends of the winding of the concentrically wound coils. Moreover, the front end of the lead portion of one concentrically wound coil and the front end of the lead portion of another concentrically wound coil are joined on the outer diameter side of the stator core. Furthermore, the lead portions of one concentrically wound coil and the lead portions of another concentrically wound coil are joined together in a radially extending state.

[0004] Furthermore, when the lead portion is arranged to extend radially, interference often occurs between the joint (the portion where the front end of the lead portion of one concentrically wound coil is joined to the front end of the lead portion of another concentrically wound coil), the bolt inserted into the fastening hole located on the outer diameter side of the stator core, and the clamp for assembling the bolt. Therefore, installation of the stator core into the motor housing, etc., often becomes difficult. Therefore, in Japanese Patent Application Publication No. 2017-50937, in order to ensure that the joint portion arranged around the fastening hole does not overlap with the fastening hole when viewed from the direction of the rotation axis, the joint portion is arranged on one side of the fastening hole (bolt) in the circumferential direction to avoid the fastening hole.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-50937

[0006] However, in the stator disclosed in Japanese Patent Application Publication No. 2017-50937, the joint is positioned on one side of the fastening hole (bolt) in the circumferential direction to avoid the fastening hole (bolt), resulting in a relatively small distance between the joint positioned to avoid the fastening hole (bolt) and the joint adjacent to it. However, for positioning the front ends when joining them and for insulation treatment of the front ends after joining, a clamp is required to cover the front ends (around the front ends). However, in the stator disclosed in Japanese Patent Application Publication No. 2017-50937, the relatively small distance between the joints makes clamp placement difficult. As a result, there is a problem that the mass production of the stator may be exacerbated. Summary of the Invention

[0007] The present invention was made to solve the aforementioned problems. One object of the present invention is to provide a stator that can prevent interference between fastening components and the fixtures for assembling fastening components, and can improve mass production.

[0008] To achieve the above objectives, one aspect of the present invention provides a stator comprising: a stator core, which is stacked on an annular steel plate having fastening holes for fastening members to be inserted on its outer diameter side, and having a plurality of teeth forming slots; and a plurality of coils having a pair of legs housed in slots, a connecting portion disposed on the outer side of the end face of the stator core and connecting the pair of legs to each other, and a lead portion disposed on the outer diameter side of the stator core. The stator is provided with: a first joint portion, which connects the lead portion of a first coil among the plurality of coils to the lead portion of a second coil among the plurality of coils via a first front end portion disposed on the end side of the lead portion of the first coil among the plurality of coils. The second front end portion on the side of the part is configured, when viewed from the direction of the rotation axis, to be positioned on the outer diameter side of the end of the fastening member that is inserted into the fastening hole, and is joined together in a state where it is set to extend radially; and the second joint portion is configured to be joined together by the third front end portion, which is located at the end of the lead portion of the third coil among the plurality of coils, at a position corresponding to the fastening member, and the fourth front end portion, which is located on the end of the lead portion of the fourth coil among the plurality of coils, in a state where it is set to extend along the direction of the rotation axis without overlapping with the fastening member when viewed from the direction of the rotation axis.

[0009] In one aspect of the stator of the present invention, as described above, a second joint is provided. This second joint is formed by joining a third front end portion located at a position corresponding to the fastening member and on the end side of the lead portion of the third coil, and a fourth front end portion located on the end side of the lead portion of the fourth coil, in a state where they extend along the rotation axis direction without overlapping the fastening member when viewed from the rotation axis direction. Therefore, since the second joint extends along the rotation axis direction, the distance between the first joint and the second joint is relatively large, unlike cases where the joint is formed in a circumferentially non-overlapping manner. As a result, fixtures can be easily arranged around the first and second joints, thus improving stator productivity. Furthermore, since the second joint extends along the rotation axis direction, interference between the fastening member and the fixture assembling the fastening member can be prevented. These results in preventing interference between the fastening member and the fixture assembling the fastening member, and also improve mass production capabilities.

[0010] Furthermore, unlike the case where all joints are formed by a second joint extending along the rotation axis, a portion of the joint is formed by a first joint. Therefore, the length of the portion formed by the first joint in the rotation axis direction is relatively small, allowing other components to be arranged around the portion formed by the first joint.

[0011] Furthermore, unlike the case where all joints are composed of a second joint extending along the axis of rotation, the first joint extends radially, resulting in a larger distance between the front ends of the first joints. This allows for easy configuration of a fixture for processing the front ends of the first joints, thus improving the mass production of the stator.

[0012] According to the present invention, as described above, interference between the fastening component and the fixture for assembling the fastening component can be prevented, and mass production can be improved. Attached Figure Description

[0013] Figure 1 This is a perspective view of the stator in one embodiment.

[0014] Figure 2 This is a cross-sectional view of the stator in one embodiment.

[0015] Figure 3 This is a perspective view (1) of a concentrically wound coil with the joint extending radially in one embodiment.

[0016] Figure 4 This is a perspective view (2) of a concentrically wound coil with the joint extending radially in one embodiment.

[0017] Figure 5 This is a perspective view (1) of a concentrically wound coil in one embodiment, where the joint extends along the rotation axis.

[0018] Figure 6 This is a perspective view (2) of a concentrically wound coil whose joint extends along the rotation axis direction in one embodiment.

[0019] Figure 7 This is a top view of the stator in one embodiment.

[0020] Figure 8 yes Figure 1 A magnified view of a portion of the image.

[0021] Figure 9 This is a schematic diagram of the joint extending radially.

[0022] Figure 10 This is a schematic diagram of the joint extending along the axis of rotation.

[0023] Figure 11 It is a diagram showing the configuration of concentrically wound coils (windings). Detailed Implementation

[0024] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0025] [This implementation method]

[0026] (Stabilizer construction)

[0027] Reference Figures 1 to 11 The structure of the stator 100 in this embodiment will be described.

[0028] In this application specification, such as Figure 1 As shown, "axial (rotation axis direction)" refers to the direction along the central axis C1 of the stator 100 (Z direction). "Circumferential" refers to the circumferential direction of the stator 100 (A direction). "Radially inner (inner diameter side)" refers to the direction along the radial direction towards the central axis C1 of the stator 100 (R1 direction). "Radially outer (outer diameter side)" refers to the direction along the radial direction towards the outer side of the stator 100 (R2 direction).

[0029] like Figure 1 As shown, the stator 100 includes a stator core 10 and a plurality of concentrically wound coils 20. Furthermore, the concentrically wound coils 20 are an example of a "coil" in the technical solution.

[0030] Additionally, the stator core 10 is constructed by stacking fastening holes 11 for inserting bolts 2 (see reference). Figure 2 The stator core 10 is formed from an annular steel plate. The stator core 10 is fixed to a frame (not shown) or the like by a fastening member 1. The fastening member 1 includes a bolt 2 and a washer 3. The bolt 2 is inserted into a fastening hole 11 through the washer 3. The stator core 10 has multiple teeth 13 forming slots 12. By inserting and fastening the bolt 2 into the fastening hole 11, the stator core 10 is mounted to a stator housing (not shown). A back yoke 14 is provided on the outer diameter side of the slot 12. The fastening hole 11 is located at an ear 15 that protrudes outward from the annular steel plate.

[0031] In addition, a plurality of fastening holes 11 are provided (eight in this embodiment). The plurality of fastening holes 11 are provided on the stator core 10 at approximately equal angular intervals (approximately 45 degrees apart).

[0032] (Construction of a concentrically wound coil)

[0033] Each of the multiple concentric wound coils 20 is connected by a flat wire 21 (see reference). Figure 3 It is formed by winding multiple times (concentric winding). Additionally, in stator 100, such as... Figures 3-6As shown, four types of concentrically wound coils are used: 30, 40, 50, and 60. Furthermore, concentrically wound coils 30, 40, 50, and 60 are examples of a "coil" in the technical solution. Additionally, concentrically wound coils 30 and 40 are examples of a "first coil" and a "second coil," respectively, in the technical solution. Furthermore, concentrically wound coils 50 and 60 are examples of a "third coil" and a "fourth coil," respectively, in the technical solution.

[0034] In addition, such as Figure 11 As shown, concentrically wound coils 30 and 40 constitute, for example, a portion of the V-phase, W-phase, and U-phase (forming the coil of the first junction 22). Additionally, concentrically wound coils 50 and 60 constitute, for example, a portion of the U-phase (forming the coil of the second junction 23). Furthermore, in the U-phase, groups of concentrically wound coils 30 and 40, and groups of concentrically wound coils 50 and 60, are arranged alternately along the circumferential direction.

[0035] like Figure 3 As shown, the concentrically wound coil 30 has a pair of legs 31 housed in the slot 12. Additionally, the concentrically wound coil 30 has an end face 10a disposed on the stator core 10 (see reference). Figure 1 The concentrically wound coil 30 has a lead portion 33 and a lead portion 34 disposed on the outer diameter side of the stator core 10. The lead portion 33 corresponds to one end of the flat conductor 21. The lead portion 34 corresponds to the other end of the flat conductor 21. The lead portion 33 is continuous with the leg 31 disposed on the innermost diameter side of the concentrically wound coil 30. The lead portion 34 is continuous with the leg 31 disposed on the outermost diameter side of the concentrically wound coil 40. Furthermore, the lead portion 33 and the lead portion 34 are examples of "one-side lead portion" and "other-side lead portion" respectively in the technical solution.

[0036] In addition, such as Figure 3 As shown, the lead portion 33 has a portion extending radially outward (R2 direction side). The lead portion 33 is configured to extend from the inner diameter side (R1 direction side) to the outer diameter side (R2 direction side) of the concentrically wound coil 30. Specifically, the lead portion 33 includes: a portion 33a extending along the circumferential A1 direction side; a portion 33b extending along the rotation axis direction; a portion 33c extending radially outward (R2 direction side); a portion 33d extending in a manner intersecting the radial direction, i.e., towards the radially outward side and towards the circumferential A1 direction side (approximately horizontal); and a portion 33e extending radially. In addition, a front end portion 33f extending radially is provided at the front end side of the portion 33e. Furthermore, the insulation coating of the front end portion 33f is removed.

[0037] In addition, such as Figure 3 As shown, the lead portion 34 has a portion extending radially outward (R2 direction side). The lead portion 34 is disposed on the outer diameter side (R2 direction side) of the concentrically wound coil 30. Specifically, the lead portion 34 includes: a portion 34a extending along the rotation axis direction; and a portion 34b extending radially outward (R2 direction side). In addition, a front end portion 34c extending radially is provided at the front end side of the portion 34b. Furthermore, the insulating coating of the front end portion 34c is removed. Moreover, the front ends 33f and 34c are examples of the "first front end portion" of the technical solution.

[0038] like Figure 4 As shown, the concentrically wound coil 40 is identical to the concentrically wound coil 30, having a pair of legs 41, a connecting portion 42, a lead portion 43, and a lead portion 44. The structure of the lead portion 43 is the same as that of the lead portion 33 of the concentrically wound coil 30. However, the insulating coating on the radially extending front end portion 43f of the lead portion 43 is removed. Furthermore, the lead portion 43 is continuous with the leg 41 disposed on the innermost diameter side of the concentrically wound coil 40. Furthermore, the lead portion 44 is continuous with the leg 41 disposed on the outermost diameter side of the concentrically wound coil 40. Moreover, the lead portion 43 and the lead portion 44 are examples of "one-sided lead portion" and "other-sided lead portion" respectively, representing the technical solution.

[0039] In addition, such as Figure 4 As shown, the lead portion 44 has a portion extending radially outward (R2 direction side). Specifically, the lead portion 44 includes a portion 44a extending circumferentially in the A2 direction, a portion 44b extending along the rotation axis direction, and a portion 44c extending radially outward (R2 direction side). Furthermore, a front end portion 44d extending radially is provided at the front end of portion 44c. Additionally, the insulating coating of the front end portion 44d is removed. Furthermore, the front ends 43f and 44d are examples of a "second front end portion" in the technical solution. As described above, the front ends (33f, 43f) of each of the concentrically wound coils 30 and 40, having one side lead portion (33, 43) and the other side lead portion (34c, 44d), are both radially extending.

[0040] like Figure 5As shown, the concentrically wound coil 50 has a pair of legs 51, a connecting portion 52, a lead portion 53, and a lead portion 54. The lead portion 53 is continuous with the leg 51 located on the innermost diameter side of the concentrically wound coil 50. The lead portion 54 is continuous with the leg 51 located on the outermost diameter side of the concentrically wound coil 50. Furthermore, the lead portion 53 and the lead portion 54 are examples of "one-side lead portion" and "other-side lead portion" respectively, representing the technical solution.

[0041] Furthermore, the lead portion 53 has a portion that is bent outward in the radially outward (R2 direction side) direction of the lead portion 33 and extends axially outward. The lead portion 53 is configured to extend from the inner diameter side to the outer diameter side of the concentrically wound coil 50. Specifically, the lead portion 53 includes: a portion 53a extending along the circumferential A1 direction side; a portion 53b extending along the rotation axis direction; a portion 53c extending along the radially outward (R2 direction side); a portion 53d extending in a manner intersecting the radial direction, i.e., towards the radially outward and towards the circumferential A1 direction side (approximately horizontal); and a portion 53e extending along the rotation axis direction. In addition, a front end portion 53f extending along the rotation axis direction is provided at the front end side of the portion 53e. Furthermore, the insulation coating of the front end portion 53f is removed.

[0042] Furthermore, the lead portion 53 of the concentrically wound coil 50 has a bent portion 53g between the portion extending radially outward (parts 53c and 53d) and the portion extending toward the rotation axis direction 53e. The bent portion 53g is located radially inward from the end E2 on the inner diameter side of the bolt 2. That is, if we compare the lead portion 33 of the concentrically wound coil 30 with the lead portion 53 of the concentrically wound coil 50, the lead portion 53 of the concentrically wound coil 50 has a shape in which the portion 33e of the lead portion 33 of the concentrically wound coil 30 is bent in a planar manner at a position radially inward from the end E2 on the inner diameter side of the bolt 2.

[0043] In addition, such as Figure 5 As shown, the lead portion 54 does not have a portion extending radially outward (R2 direction side), but has a portion extending axially outward. The lead portion 54 is disposed on the outer diameter side of the concentrically wound coil 50. Specifically, the lead portion 54 includes a portion 54a extending along the rotation axis direction. In addition, a front end portion 54b extending along the rotation axis direction is provided at the front end side of the portion 54a. Furthermore, the insulating coating of the front end portion 54b is removed. Moreover, the front end portions 53f and 54b are examples of a "third front end portion" in the technical solution.

[0044] Furthermore, portion 54a (front end 54b) of the lead portion 53 is located radially inward from the end E2 on the inner diameter side of the bolt 2. That is, if we compare the lead portion 34 of the concentrically wound coil 30 with the lead portion 54 of the concentrically wound coil 50, the lead portion 54 of the concentrically wound coil 50 has a shape in which portion 34b of the lead portion 34 of the concentrically wound coil 30 is planarly bent at a position radially inward from the end E2 on the inner diameter side of the bolt 2.

[0045] like Figure 6 As shown, the concentrically wound coil 60 is identical to the concentrically wound coil 50, having a pair of legs 61, a connecting portion 62, a lead portion 63, and a lead portion 64. Furthermore, the lead portion 63 is continuous with the leg 61 located on the innermost diameter side of the concentrically wound coil 60. Additionally, the lead portion 64 is continuous with the leg 61 located on the outermost diameter side of the concentrically wound coil 60. Moreover, the lead portion 63 and the lead portion 64 are examples of "one-side lead portion" and "other-side lead portion" respectively, representing the technical solution.

[0046] The lead portion 63 is configured to extend from the inner diameter side to the outer diameter side of the concentrically wound coil 60. Furthermore, the structure of the lead portion 63 is the same as that of the lead portion 53 of the concentrically wound coil 50 described above. That is, the lead portion 63 has a portion that is bent outward in the radial direction (R2 direction side) of the lead portion 43 and extends outward in the axial direction. Additionally, a front end portion 63f extending along the rotation axis direction is provided at the front end side of the lead portion 63. Furthermore, the insulation coating of the front end portion 63f is removed.

[0047] In addition, such as Figure 6 As shown, the lead portion 64 is disposed on the outer diameter side of the concentrically wound coil 60. Furthermore, the lead portion 64 does not have a portion extending radially outward (R2 direction side), but has a portion extending axially outward. Specifically, the lead portion 64 includes a portion 64a extending circumferentially in the A2 direction side and a portion 64b extending along the rotation axis direction. Additionally, a front end portion 64c extending along the rotation axis direction is provided at the front end side of portion 64b. Furthermore, the insulation coating of the front end portion 64c is removed. Moreover, the front ends 64f and 64c are an example of a "fourth front end portion" in the technical solution.

[0048] Furthermore, portion 64b (front end 63c) of the lead portion 64 is located radially inward from the end E2 on the inner diameter side of the bolt 2. That is, if we compare the lead portion 44 of the concentrically wound coil 40 with the lead portion 64 of the concentrically wound coil 60, the lead portion 64 of the concentrically wound coil 60 has a shape in which portion 44c of the lead portion 44 of the concentrically wound coil 40 is bent in a plane at a position radially inward from the end E2 on the inner diameter side of the bolt 2.

[0049] Furthermore, around the second joint 23 described later, lead portions 53, 63, 54, and 64 are formed to extend along the rotation axis. Specifically, the front ends (53f, 63f) of each of the concentrically wound coils 50 and 60, having lead portions (53b, 64c) on one side (53, 63) and lead portions (54b, 64c) on the other side, are all shaped to extend along the rotation axis.

[0050] Here, in this embodiment, as Figure 7 as well as Figure 8 As shown, a first joint 22 is provided. The first joint 22 is configured by the front end portion 33f (34c) provided on the end side of the lead portion 33 (34) of the concentric winding coil 30 and the front end portion 44d (43f) provided on the end side of the lead portion 44 (43) of the concentric winding coil 40. When viewed from the direction of the rotation axis, the first joint 22 is positioned on the outer diameter side of the end portion E1 that is inserted into the fastening member 1 of the fastening hole 11, which is closer to the inner diameter side. It is also configured to be joined in a state of extending radially.

[0051] Specifically, in this embodiment, such as Figure 9 As shown, with the front ends 33f (34c) and 44d (43f) extending radially outward, and with the front ends 33f and 44d stacked on top of each other in the direction of the rotation axis, and with the front ends 43f and 34c stacked on top of each other in the direction of the rotation axis, the front ends 33f (34c) and 44d (43f) are joined together to form the first joint 22.

[0052] In addition, in this embodiment, such as Figure 7 as well as Figure 8 As shown, a second joint 23 is provided. The second joint 23 is formed by joining the front end portion 53f (54b) of the lead portion 53 (54) of the concentrically wound coil 50, which is located at the position corresponding to the fastening member 1, with the front end portion 64c (64f) of the lead portion 64 (63) of the concentrically wound coil 60, in a state in which it extends along the rotation axis direction without overlapping with the fastening member 1 when viewed from the rotation axis direction.

[0053] Specifically, in this embodiment, such as Figure 10 As shown, with the front ends 53f (54b) and 64c (63f) both extending in the direction of the rotation axis, and with the front ends 53f and 64c overlapping each other in the radial direction, and with the front ends 63f and 54b overlapping each other in the radial direction, the front ends 53f (54b) and 64c (63f) are joined to form a second joint 23.

[0054] In addition, in this embodiment, such as Figure 7 as well as Figure 8 As shown, viewed from the direction of the rotation axis, the second joint 23 is positioned on the inner diameter side of the first joint 22. Specifically, viewed from the direction of the rotation axis, the first joint 22 is positioned on the outer diameter side of the back yoke 14. On the other hand, the second joint 23 is positioned on the inner diameter side of the back yoke 14.

[0055] Furthermore, in this embodiment, multiple second joint portions 23 are provided in a manner that is adjacent to each other in the circumferential direction (two in this embodiment). Moreover, the phases of the multiple second joint portions 23 that are provided in a manner that is adjacent to each other in the circumferential direction are the same (for example, U phase).

[0056] In this embodiment, an insulating cover 90 is provided to cover the second joint portion 23. The insulating cover 90 is configured to cover multiple (two in this embodiment) second joint portions 23 of the same phase that are arranged adjacent to each other. The insulating cover 90 is made of resin, for example. That is, four lead portions (front ends) are covered by one insulating cover 90. Furthermore, multiple (two in this embodiment) first joint portions 22 that are arranged adjacent to each other are also covered by the insulating cover 90. Additionally, the multiple first joint portions 22 covered by the insulating cover 90 are of the same phase (U phase, V phase, or W phase).

[0057] In addition, in this embodiment, such as Figure 1 As shown, a plurality of fastening holes 11 for inserting the fastening member 1 are provided at equal angular intervals along the circumferential direction. Specifically, eight fastening holes 11 are provided. Furthermore, a plurality of second engagement portions 23 (specifically, groups of second engagement portions 23) are provided in such a manner that they correspond to the circumferential positions of each of the plurality of (eight) fastening holes 11. A plurality of groups of second engagement portions 23 (seven) are provided. In addition, as... Figure 11 As shown, the second joints 23 (concentric winding coils 50 and 60) are not located around the neutral line 70 and the power line 80. Furthermore, the group of seven second joints 23 is in phase (e.g., U-phase).

[0058] In addition, in this embodiment, such as Figure 7 as well as Figure 8 As shown, when viewed radially, the circumferential position of the fastening member 1 overlaps with the circumferential position of the second joint 23. Specifically, the second joint 23 is located within a range smaller than the circumferential width of the fastening member 1. Furthermore, in this embodiment, the entire circumferential position of the plurality of second joints 23 overlaps with the circumferential position of the fastening member 1 when viewed radially, but it is also possible to provide the second joint 23 at a position that does not overlap with the circumferential position of the fastening member 1.

[0059] In addition, in this embodiment, such as Figure 7 As shown, viewed from the direction of the rotation axis, the first joint 22 is positioned on the inner diameter side of the outer peripheral surface 10b of the stator core 10. Furthermore, the inner diameter end E2 of the bolt 2 and the inner diameter end E1 of the washer 3 are positioned on the inner diameter side of the outer peripheral surface 10b of the stator core 10.

[0060] In addition, in this embodiment, such as Figure 7 as well as Figure 8 As shown, viewed from the direction of the rotation axis, the first joint 22 (at least a portion of the first joint 22) is disposed radially outward from the end E2 on the inner diameter side of the bolt 2 and the end E1 on the inner diameter side of the washer 3, and a plurality of such first joints 22 are provided. Moreover, the plurality of first joints 22 are configured to extend radially outward.

[0061] In addition, in this embodiment, when viewed from the direction of the rotation axis, the second joint 23 (all parts of the second joint 23) is disposed radially inward than the end E2 on the inner diameter side of the bolt 2 and the end E1 on the inner diameter side of the gasket 3.

[0062] In addition, such as Figure 7 As shown, viewed from the direction of the rotation axis, the first joint 22 and the second joint 23 are positioned on the inner diameter side of the central axis C2 of the fastening member 1. Furthermore, viewed from the direction of the rotation axis, the first joint 22 and the second joint 23 are positioned at the end E3 (refer to) on the inner diameter side of the fastening hole 11. Figure 2 (On the inner diameter side)

[0063] In addition, in this embodiment, such as Figure 2 As shown, the axial distance L1 from the upper end of the first joint 22 to the end face 10a of the stator core 10 is greater than the axial distance L2 from the upper end of the fastening member 1 (bolt 2) to the end face 10a of the stator core 10. Specifically, the axial distance L3 from the lower end of the first joint 22 to the end face 10a is also greater than the axial distance L2 from the upper end of the fastening member 1 (bolt 2) to the end face 10a. Furthermore, the axial distances L4 from the upper end of the second joint 23 to the end face 10a and L5 from the lower end to the end face 10a are greater than the axial distance L1 from the upper end of the first joint 22 and the axial distance L2 from the upper end of the fastening member 1 (bolt 2) to the end face 10a.

[0064] (Effects of this implementation method)

[0065] In this embodiment, the following effect can be obtained.

[0066] In this embodiment, as described above, a second joint (23) is provided. This second joint (23) is formed by joining a third front end portion (53f, 54b) located at a position corresponding to the fastening member (1) and located at the end side of the lead portion (53, 54) of the third coil (50) with a fourth front end portion (63f, 64c) located at the end side of the lead portion (63, 64) of the fourth coil (60) in a state where it extends along the rotation axis direction without overlapping with the fastening member (1) when viewed from the rotation axis direction. As a result, since the second joint portion (23) is set to extend along the rotation axis direction, the distance between the first joint portion (22) and the second joint portion (23) is relatively large, unlike the case where the joint portion is avoided in the circumferential direction. As a result, it is easy to arrange jigs (for jigs covered by insulating covers (90)) around the first joint (22) and the second joint (23), thus improving the production efficiency of the stator (100). Furthermore, the second joint (23) is configured to extend along the rotation axis, thus preventing interference between the fastening member (1) and the jigs of the combined fastening member (1). The above results in preventing interference between the fastening member (1) and the jigs of the combined fastening member (1), and improving mass production.

[0067] Furthermore, unlike the case where the entire joint is composed of a second joint (23) extending along the rotation axis, a portion of the joint is composed of a first joint (22). As a result, the length of the portion composed of the first joint (22) in the rotation axis direction is relatively small, so other components can be arranged around the portion composed of the first joint (22).

[0068] Furthermore, unlike the case where the entire joint is composed of a second joint (23) extending along the rotation axis, the first joint (22) extends radially (radially outward), resulting in a larger spacing between the front ends (33f, 34c, 43f, 44d) of the first joint (22). This allows for easy configuration of fixtures for processing the front ends (33f, 34c, 43f, 44d) of the first joint (22), thus improving the mass production of the stator (100).

[0069] Furthermore, in this embodiment, as described above, when viewed from the direction of the rotation axis, the second joint (23) is positioned on the inner diameter side compared to the first joint (22). With this configuration, the second joint (23) is positioned on the inner diameter side, thus easily preventing interference between the second joint (23) and the clamp of the combined stator (100).

[0070] Furthermore, in this embodiment, as described above, when viewed radially, the circumferential position of the fastening member (1) overlaps with the circumferential position of the second joint (23). With this configuration, when viewed from the rotation axis direction, the second joint (23) can be arranged in a manner that does not overlap with the fastening member (1). Additionally, when the circumferential positions of all the second joints (23) overlap with the circumferential positions of the fastening member (1), the second joints (23) can be arranged within a relatively narrow range in the circumferential direction, thus allowing the portion formed by the first joint (22) to be relatively large. As a result, larger other components can be arranged around the portion formed by the first joint (22).

[0071] Furthermore, in this embodiment, as described above, a plurality of fastening holes (11) for inserting the fastening member (1) are provided at equal angular intervals along the circumference, and the second joint (23) is provided in such a manner that it corresponds to the circumferential position of each of the plurality of fastening holes (11). If configured in this way, since the plurality of second joints (23) are in phase, unlike the case where the second joints (23) are provided in phases, it is possible to suppress the increase in the type (shape) of the coil (20) constituting the second joint (23).

[0072] Furthermore, in this embodiment, as described above, an insulating cover (90) is provided to cover the second joint (23). Therefore, the second joint (23) can be easily insulated by the insulating cover (90).

[0073] Furthermore, in this embodiment, as described above, multiple second joints (23) are arranged adjacent to each other in the circumferential direction, and the multiple second joints (23) arranged adjacent to each other in the circumferential direction are identical. If configured in this way, the multiple second joints (23) arranged adjacent to each other are identical, so it is easy to ensure the insulation of the multiple second joints (23) arranged adjacent to each other.

[0074] Furthermore, in this embodiment, as described above, for the stator (100), the insulating cover (90) is configured to cover multiple second joints (23) of the same phase that are arranged adjacent to each other. If configured in this way, the second joints (23) of the same phase are covered by the insulating cover (90), so the insulating cover (90) can prevent the second joints (23) from short-circuiting with each other.

[0075] Furthermore, in this embodiment, as described above, when viewed from the direction of the rotation axis, the first joint (22) is positioned on the inner diameter side of the outer peripheral surface (10b) of the stator core (10). With this configuration, the radial size of the stator (100) can be reduced compared to the case where the first joint (22) is positioned on the outer diameter side of the outer peripheral surface (10b) of the stator core (10).

[0076] Furthermore, in this embodiment, as described above, the first joint (22) is formed by joining the first front end portion (33f, 34c) and the second front end portion (43f, 44d) in a radially outward state, and the first front end portion (33f, 34c) and the second front end portion (43f, 44d) are stacked on top of each other in the direction of the rotation axis. Similarly, the second joint (23) is formed by joining the third front end portion (53f, 54b) and the fourth front end portion (63f, 64c) in a radially stacked state, and the third front end portion (53f, 54b) and the fourth front end portion (63f, 64c) are stacked on top of each other. With this configuration, compared to joining all the front end portions in a circumferential arrangement, the spacing between the first joint portions (22) and the spacing between the first joint portions (22) and the second joint portion (23) is increased, thus easily ensuring insulation between the joint portions.

[0077] Furthermore, in this embodiment, as described above, the axial distance (L1) from the upper end of the first joint (22) to the end face (10a) of the stator core (10) is greater than the axial distance (L2) from the upper end (10) of the fastening member (1) to the end face (10a) of the stator core. With this configuration, the height of the fastening member (1) is relatively small, thus suppressing interference between the fastening member (1) and other components.

[0078] Furthermore, in this embodiment, as described above, each of the plurality of coils (20) is constructed by winding a flat conductor (21) multiple times. Each of the plurality of coils (20) includes: a side lead portion disposed on one end of the flat conductor (21) and extending from the inner diameter side to the outer diameter side of the stator core (10); and another side lead portion disposed on the other end of the flat conductor (21) and disposed on the outer diameter side of the stator core (10). Moreover, each of the first coil (30) and the second coil (40) has a front end portion (33f, 43f) of one side lead portion (33, 43) and a front end portion (34c, 44d) of the other side lead portion (34, 44) that both extend radially. Furthermore, the front ends (53f, 63f) of the lead portion (53, 63) on one side and the front ends (54b, 64c) of the lead portion (54, 64) on the other side of the third coil (50) and the fourth coil (60) are both extended along the direction of the rotation axis. With this configuration, the shapes of the third coil (50) and the fourth coil (60) can be made the same. Therefore, compared with the first coil (30) and the second coil (40), only one type of coil is added as the third coil (50) and the fourth coil (60), thereby easily preventing interference between the fastening member (1) and the clamp of the combined fastening member (1) and improving mass production.

[0079] Furthermore, in this embodiment, as described above, when viewed from the direction of the rotation axis, the first joint (22) is located radially outward from the end (E1, E2) on the inner diameter side of the fastening member (1), and multiple first joints (22) are provided, with the multiple first joints (22) arranged to extend radially outward. With this configuration, the distance between the radially outward ends of the first joints (22) is reliably increased, so that clamps for processing the front ends (33f, 34c, 43f, 44d) of the first joints (22) can be reliably configured.

[0080] Furthermore, in this embodiment, as described above, when viewed from the direction of the rotation axis, the second joint (23) is positioned radially inward from the end (E1, E2) on the inner diameter side of the fastening member (1). With this configuration, the distance between the first joint (22) and the second joint (23) is relatively large, so it is easy to configure clamps for processing the front ends (33f, 34c, 43f, 44d) of the first joint (22) and the front ends (53f, 54b, 63f, 64c) of the second joint (23).

[0081] [Variation Example]

[0082] Furthermore, the embodiments disclosed herein should be considered illustrative in all respects and not restrictive. The scope of the invention is not shown by the description of the above embodiments but by the technical solutions, and includes all modifications (variations) within the scope and meaning equivalent to the technical solutions.

[0083] For example, although the above embodiment shows an example with eight fastening holes in the stator core (electromagnetic steel plate), the present invention is not limited thereto. For example, a number of fastening holes other than eight may also be provided in the stator core (electromagnetic steel plate).

[0084] Furthermore, although the above embodiment shows an example where the front end of the concentrically wound coil of the U phase extends along the direction of rotation, the present invention is not limited thereto. For example, the front end of the concentrically wound coil of the V phase or W phase may also be configured to extend along the direction of rotation.

[0085] Furthermore, although the above embodiment shows an example of two second joints arranged circumferentially and extending along the axis of rotation, the present invention is not limited thereto. For example, there may be three or more second joints arranged circumferentially.

[0086] Furthermore, although the above embodiment shows an example where two first joints (second joints) arranged circumferentially are covered by an insulating cover, the present invention is not limited thereto. For example, the insulating cover may be provided on a unit basis for each joint.

[0087] Furthermore, although the above embodiment shows an example where the first joint is arranged radially and positioned closer to the inner diameter than the outer circumferential surface of the stator core, the present invention is not limited thereto. For example, the first joint may also be arranged closer to the outer diameter than the outer circumferential surface of the stator core.

[0088] Furthermore, although the above embodiments show an example of the front ends of the two lead portions being joined in a state of being stacked along the rotation axis or radially, the present invention is not limited thereto. For example, the front ends of the two lead portions may also be joined in a state of being stacked circumferentially.

[0089] Furthermore, although the above embodiments show an example where one side lead portion 33 (43, 53, 63) of the concentrically wound coil 30 (40, 50, and 60) has a portion 33d (53d) extending along the A1 direction, the present invention is not limited thereto. For example, one side lead portion of the concentrically wound coil may not have a portion extending along the A1 direction.

[0090] Furthermore, although the above embodiment shows an example where the lead portion 44 (64) on the other side of the concentrically wound coil 40 (60) can extend along the A2 direction, the present invention is not limited thereto. For example, the lead portion on the other side of the concentrically wound coil may not have a portion extending along the A2 direction.

[0091] Explanation of reference numerals in the attached figures

[0092] 1…fastening components

[0093] 10…Stator core

[0094] 10a…end face

[0095] 10b…outer periphery

[0096] 11… Fastening Hole

[0097] 12… slots

[0098] 13… teeth

[0099] 20, 30, 40, 50, 60… concentric winding coils

[0100] 21…flat conductor

[0101] 22…First joint

[0102] 23…Second joint

[0103] 30… Concentric winding coil (coil, first coil)

[0104] 31, 41, 51, 61… Legs

[0105] 32, 42, 52, 62… connecting parts

[0106] 33, 43, 53, 63… Lead wire section (one-sided lead wire section)

[0107] 33f, 34c… Front end portion (first front end portion)

[0108] 34, 44, 54, 64… Lead wire section (the other lead wire section)

[0109] 40… Concentric winding coils (coil, second coil)

[0110] 43f, 44d… Anterior part (second anterior part)

[0111] 50… Concentric winding coil (coil, third coil)

[0112] 53f, 54b… Anterior part (third anterior part)

[0113] 60… Concentric winding coil (coil, fourth coil)

[0114] 63f, 64c… Anterior end portion (fourth anterior end portion)

[0115] 90…Insulation Coverage

[0116] 100…Stator

[0117] E1…end.

Claims

1. A stator having: The stator core comprises an annular steel plate stacked on its outer diameter side, having fastening holes for fastening components to be inserted, and having multiple teeth forming slots; and Multiple coils, each having a pair of legs housed in the slot, a connecting portion disposed on the outer side of the end face of the stator core and connecting the pair of legs to each other, and a lead portion disposed on the outer diameter side of the stator core. The stator is provided with: The first joint is formed by joining a first front end portion provided on the end side of the lead portion of the first coil of the plurality of coils and a second front end portion provided on the end side of the lead portion of the second coil of the plurality of coils, which, when viewed from the direction of the rotation axis, is positioned on the outer diameter side of the end of the fastening member inserted into the fastening hole and is configured to extend radially. The second joint is formed by joining a third front end portion located at a position corresponding to the fastening member and located on the end side of the lead portion of the third coil among the plurality of coils, and a fourth front end portion located on the end side of the lead portion of the fourth coil among the plurality of coils, in a state where they extend along the rotation axis direction without overlapping with the fastening member when viewed from the rotation axis direction; and An insulating cover portion is configured to cover the aforementioned second joint portion. Viewed from the axis of rotation, the second joint is positioned on the inner diameter side compared to the first joint. Viewed radially, the circumferential position of the fastening member overlaps with the circumferential position of the second joint. The first joint is configured in a manner that does not overlap with the fastening member in the radial direction.

2. The stator according to claim 1, wherein, The aforementioned fastening holes for inserting the fastening components are provided in a plurality of circumferentially spaced at equal angles. Multiple second joints are provided in such a manner that they correspond to the circumferential positions of the aforementioned multiple fastening holes.

3. The stator according to claim 1, wherein, The aforementioned second joint is provided in multiple adjacent portions in the circumferential direction. The aforementioned second joints are identical and are arranged adjacent to each other in the circumferential direction.

4. The stator according to claim 3, wherein, The aforementioned insulating cover is configured to cover the aforementioned second joint portions of the same phase that are arranged adjacent to each other.

5. The stator according to any one of claims 1 to 4, wherein, Viewed from the direction of the rotation axis, the first joint is located on the inner diameter side of the outer circumferential surface of the stator core.

6. The stator according to any one of claims 1 to 4, wherein, The first joint is formed by joining the first front end portion and the second front end portion, both of which extend radially outward, and by overlapping the first front end portion and the second front end portion with each other in the direction of rotation axis. The second joint is formed by joining the third and fourth front ends, which both extend in the direction of the rotation axis, and are joined together in a radially overlapping manner.

7. The stator according to any one of claims 1 to 4, wherein, The axial distance from the upper end of the first joint to the end face of the stator core is greater than the axial distance from the upper end of the fastening member to the end face of the stator core.

8. The stator according to any one of claims 1 to 4, wherein, The aforementioned multiple coils are formed by winding flat wires multiple times. Each of the aforementioned coils includes: a side lead portion disposed at one end of the flat conductor and extending from the inner diameter side to the outer diameter side of the stator core; and a side lead portion disposed at the other end of the flat conductor and located on the outer diameter side of the stator core. The first coil and the second coil described above each have a radially extending front end portion of the lead portion on one side and a radially extending front end portion of the lead portion on the other side. The aforementioned third coil and the aforementioned fourth coil each have a shape in which the front end of the aforementioned one-side lead portion and the front end of the aforementioned other-side lead portion both extend along the direction of the rotation axis.

9. The stator according to any one of claims 1 to 4, wherein, Viewed from the direction of the rotation axis, the aforementioned first joint is located radially outward from the end of the fastening member on the inner diameter side, and multiple such joints are provided. The aforementioned plurality of first joints are configured to extend radially outward.

10. The stator according to any one of claims 1 to 4, wherein, Viewed from the direction of the rotation axis, the second joint is located radially inward from the end of the fastening member on the inner diameter side.

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