Rotating electric machine

Abstract

The invention provides a rotating electric machine, which prevents or minimizes the increase in the radial dimension of the whole rotating electric machine and reliably fixes a cover member covering the coil end part. The rotating electrical machine includes: an iron core having a plurality of teeth; a coil wire wound around the iron core so as to be inserted into slots formed between the plurality of teeth in the circumferential direction, the coil wire forming a coil end on the outer side in the axial direction with respect to the axial end surface of the iron core; a first cover member covering the coil end portion from an axially outer side, a radially inner side, and a radially outer side; a second cover member covering an axial end surface of the iron core; and a refrigerant space located between the first cover member and the second cover member, the first cover member and the second cover member being connected to each other via a first connection portion on the outside in the radial direction of the refrigerant space and connected to each other via a second connection portion on the inside in the radial direction of the refrigerant space in a cross-sectional view sectioned along a plane passing through the central axis of the iron core, at least one of the first connection portion and the second connection portion overlaps the iron core when viewed in the axial direction.

Description

Technical Field

[0001] The present invention relates to a rotating electrical machine. Background Art

[0002] There is known a technique in which a coil end cover covering a coil end and an outer cover covering the outer periphery of a stator core are connected via a radial snap-fit ​​portion.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2010-226870.

[0006] However, the conventional technology described above has problems such as an increase in the radial dimension of the entire rotating electrical machine due to the outer cover itself and an increase in the radial dimension of the entire rotating electrical machine due to the radially outward protrusion of the snap-fit ​​portion. Summary of the Invention

[0007] Therefore, in one aspect, an object of the present invention is to prevent or minimize an increase in the radial dimension of the entire rotating electrical machine and to reliably fix a cover member that covers a coil end.

[0008] In one aspect, a rotating electrical machine is provided, comprising:

[0009] an iron core having a plurality of teeth;

[0010] a coil wire wound around the core so as to be inserted into slots formed circumferentially between the plurality of teeth and forming a coil end portion axially outward relative to an axial end surface of the core;

[0011] a first cover member covering the coil end portion from an axially outer side, a radially inner side, and a radially outer side;

[0012] a second cover member covering an axial end surface of the core; and

[0013] a refrigerant space located between the first cover member and the second cover member,

[0014] In a cross-sectional view taken along a plane passing through the central axis of the core, the first cover member and the second cover member are connected to each other via a first connecting portion on a radially outer side of the refrigerant space and are connected to each other via a second connecting portion on a radially inner side of the refrigerant space.

[0015] At least one of the first connection portion and the second connection portion overlaps with the core when viewed in the axial direction.

[0016] In one aspect, according to the present invention, it is possible to prevent or minimize an increase in the radial volume of the entire rotating electrical machine and reliably fix the cover member covering the coil end. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view schematically showing a cross-sectional structure of a motor according to one embodiment.

[0018] Figure 2 is a cross-sectional view of a portion of the stator core.

[0019] Figure 3 It is along Figure 1 A cross-sectional view of the stator along line AA.

[0020] Figure 4 This is a perspective view of the stator removed from the motor case.

[0021] Figure 5A It is a cross-sectional view of the stator cut along a plane passing through the rotation axis, and is a cross-sectional view at a circumferential position where no slots exist.

[0022] Figure 5B This is a cross-sectional view of the stator taken along a plane perpendicular to the rotation axis, and is a cross-sectional view taken along a plane passing through the core end face cover.

[0023] Figure 6 This is a perspective view of the coil end cover as a single piece, viewed from the axial outside.

[0024] Figure 7 This is a perspective view of the coil end cover as a single piece, viewed from the axial inside.

[0025] Figure 8 This is a perspective view of the core end face cover as a single piece, viewed from the axial outside.

[0026] Figure 9 This is a perspective view of the core end face cover as a single piece, viewed from the axial inside.

[0027] Figure 10 This is an enlarged perspective view showing the first snap-fit ​​portion in the connection structure between the coil end cover and the core end surface cover.

[0028] Figure 11 This is a perspective view showing an enlarged view of the second snap-fit ​​portion in the connection structure between the coil end cover and the core end surface cover.

[0029] Figure 12 It is a cross-sectional view of the stator cut along a plane passing through the rotation axis, and is a cross-sectional view at a circumferential position passing through the slots.

[0030] Figure 13 yes Figure 12Magnified view of part B.

[0031] Figure 14 It is along Figure 12 Cross-sectional view along line CC. DETAILED DESCRIPTION

[0032] The following describes various embodiments in detail with reference to the accompanying drawings. It should be noted that the dimensional ratios in the drawings are merely examples and are not intended to be limiting. Furthermore, for ease of explanation, shapes and other aspects of the drawings may be partially exaggerated. Furthermore, in the drawings, for ease of illustration, reference numerals may be assigned to only some of the components with the same attributes.

[0033] Figure 1 It is a cross-sectional view schematically showing the cross-sectional structure of the motor 1 according to one embodiment. Figure 2 It is a cross-sectional view of a portion of the stator core 211 . Figure 3 It is along Figure 1 sectional view of the stator 21 along line AA.

[0034] Figure 1 The rotating shaft 12 of the motor 1 is shown. In the following description, the axial direction refers to the direction in which the rotating shaft (rotation center) 12 of the motor 1 extends, the axially outer side refers to the side away from the axial center of the stator core 211, and the axially inner side refers to the side toward the axial center of the stator core 211. Furthermore, the radial direction refers to the radial direction centered on the rotating shaft 12, the radially outer side refers to the side away from the rotating shaft 12, and the radially inner side refers to the side toward the rotating shaft 12. Furthermore, the circumferential direction corresponds to the direction of rotation around the rotating shaft 12.

[0035] The motor 1 may be a vehicle driving motor used in, for example, a hybrid vehicle or an electric vehicle, but the motor 1 may also be used for any other purpose.

[0036] The motor 1 is housed in and supported by the motor housing 10. It should be noted that the motor housing 10 may also house drive elements (such as a reduction mechanism) other than the motor 1. The motor housing 10 may also be formed by a combination of multiple housing components.

[0037] In this embodiment, the motor 1 is an inner rotor type, and the stator 21 is provided so as to surround the radially outer side of the rotor 30 .

[0038] The stator 21 is fixed to the motor housing 10. The stator 21 includes a stator core 211, a coil wire 22, and a foam insulator 24 (see Figure 3 ), coil end cover 50 and core end face cover 60.

[0039] Stator core 211 is formed, for example, from annular, magnetic laminated steel plates. However, it can also be formed from a compacted body of compressed and solidified magnetic powder. The inner and outer circumferences of stator core 211 (e.g., the back yoke) can also be formed from separate components. Furthermore, stator core 211 can be formed by combining circumferentially divided cores.

[0040] The stator core 211 has a fixing portion 2118 that protrudes radially outward. The fixing portion 2118 has a bolt fastening hole through which a bolt BT1 passes. The stator core 211 is fixed to the motor case 10 by the bolt BT1 fastened to the fixing portion 2118 .

[0041] like Figure 2 As shown, the stator core 211 has teeth 214 at regular intervals along the circumferential direction on the radially inner side. Slots 216 are formed between circumferentially adjacent teeth 214. The slots 216 are open on both sides of the axial direction and on the radially inner side. It should be noted that in this embodiment, the teeth 214 have a circumferentially enlarged dimension at their radially inner ends 2140. In other words, the teeth 214 have a circumferentially enlarged shape at their radially inner ends 2140.

[0042] The coil wire 22 may be a wire covered by an insulating coating. Figure 3 For ease of illustration, the coil wire 22 is shown without its insulating covering. The cross-section of the coil wire 22 is arbitrary, and can be, for example, rectangular (flat wire) or circular (round wire). The coil wire 22 is wound around the stator core 211, thereby forming a stator coil. It should be noted that the coil wire 22 can be wound in any manner, such as concentrated winding or distributed winding.

[0043] The coil wire 22 is inserted into the slot 216 and wound on the stator core 211. In addition, the coil end 223 is formed on the axially outer side relative to the axial end face of the stator core 211. It should be noted that the coil end 223 is formed by the portion of the coil wire 22 that spans the slots 216 in the circumferential direction (the portion outside the slot 216). The coil end 223 is formed on both axial sides of the stator core 211. The coil end 223 has a circular ring shape when observed in the axial direction.

[0044] In this embodiment, the coil end 223 has a shape that tilts radially outward from the axially outward side. This makes it easier to maintain radial clearance between the coil wires 22 forming the coil end 223. This configuration is suitable for situations where the coil wires 22 forming the coil end 223 are so-called segmented coils and are connected by welding. This is because the larger the radial clearance between the coil wires 22, the easier it is to ensure space for the welding jig.

[0045] The foamed insulator 24 is formed by foaming foamed insulation paper (slot paper) 240 (described later) disposed within the slot 216. The foamed insulator 24 surrounds the coil wire 22 within the slot 216. Alternatively, the foamed insulator 24 may be positioned to block the radially inner opening of the slot 216. For example, the foamed insulator 24 may be positioned axially inward of the through-hole 62 of the core end face cover 60 (described later) so as to extend along the entire axial direction of the slot 216. In this case, the core end face cover 60 and the foamed insulator 24 can block the radially inner opening of the slot 216.

[0046] The rotor 30 is arranged radially inside the stator 21 .

[0047] The rotor 30 includes a rotor core 32 and a rotor shaft 34 .

[0048] The rotor core 32 is fixed to the radially outer surface of the rotor shaft 34 and rotates integrally with the rotor shaft 34. The rotor core 32 has a shaft hole 320, and the rotor shaft 34 is fitted into the shaft hole 320. The rotor core 32 can be fixed to the rotor shaft 34 by shrink fitting, press fitting, or similar means. For example, the rotor core 32 can also be connected to the rotor shaft 34 by a key connection or a spline connection. The rotor shaft 34 is rotatably supported on the motor housing 10 via bearings (such as bearings 14a). It should be noted that the rotor shaft 34 constitutes the rotating shaft 12 of the motor 1.

[0049] The rotor core 32 is formed of, for example, an annular magnetic laminated steel plate. Permanent magnets may be provided on the inner portion or radially outer surface of the rotor core 32.

[0050] The coil end cover 50 surrounds the coil end 223. That is, the coil end cover 50 covers the coil end 223 from the axial outside, the radial inside, and the radial outside. The coil end cover 50 can be formed of a resin material when low heat dissipation is important, or can be formed of a metal material when low heat dissipation is not important.

[0051] The core end face cover 60 covers the axial end face 2110 of the stator core 211. The core end face cover 60 has through-holes 62 at circumferential positions corresponding to the slots 216. The through-holes 62 are formed to allow the coil wire 22 extending axially outward from the slots 216 to pass through. The core end face cover 60 can be formed of a resin material when low heat dissipation is important, or it can be formed of a metal material when low heat dissipation is not important.

[0052] The coil end cover 50 and the core end cover 60 are connected to each other. The coil end cover 50 and the core end cover 60 form an annular oil passage 80 (see FIG. 8 ) between the coil end cover 50 and the core end cover 60 and the axial end face 2110 of the stator core 211. Figure 1Further details of the coil end cover 50 and the core end face cover 60 will be described later when the connection structure of the coil end cover 50 and the core end face cover 60 is described in detail.

[0053] It should be noted that in Figure 1 The motor 1 has a specific structure, but the structure of the motor 1 is not limited to this specific structure. Figure 1 In the embodiment, the rotor shaft 34 is solid, but it can also be hollow.

[0054] Next, refer to Figure 1 and Figure 3 , while referring to Figure 4 The following drawings illustrate the characteristic structure of this embodiment. The following mainly describes the structure on one axial side (coil end cover 50 or core end face cover 60, etc.), but the structure on the other axial side can also be the same.

[0055] Figure 4 It is a perspective view of the stator 21 in a state of being removed from the motor case 10 . Figure 5A It is a cross-sectional view of the stator 21 cut along a plane passing through the rotation shaft 12 , and is a cross-sectional view at a circumferential position where the slot 216 does not exist. Figure 5A Only one side that is symmetrical about the rotation axis 12 is shown. Figure 5B It is a cross-sectional view of the stator 21 cut along a plane perpendicular to the rotation shaft 12 and is also a cross-sectional view cut along a plane of the core end surface cover 60 . Figure 5B Only a portion of the circumferential range is shown. Figure 6 and Figure 7 This is a three-dimensional diagram of the coil end cover 50 in a single-piece state. Figure 6 This is a three-dimensional diagram viewed from the outside of the axis. Figure 7 This is a perspective view viewed from the inside of the axis. Figure 8 and Figure 9 1 is a perspective view of a single-piece core end face cover 60. Figure 8 This is a three-dimensional diagram viewed from the outside of the axis. Figure 9 This is a perspective view viewed from the inside of the axis. Figure 10 It is a perspective view showing an enlarged view of the first snap-fit ​​portion 73 in the connection structure between the coil end cover 50 and the core end surface cover 60 . Figure 11 It is a perspective view showing an enlarged view of the second snap-fit ​​portion 74 in the connection structure between the coil end cover 50 and the core end surface cover 60 .

[0056] like Figure 6 and Figure 7 As shown, the coil end cover 50 is annular when viewed in the axial direction. The top surface portion 5030 on the axial outer side, the peripheral surface portion 5031 on the radial outer side, and the peripheral surface portion 5032 on the radial inner side of the coil end cover 50 are shown in a cross-sectional view ( FIG. Figure 1 ) is in a C-shaped form. The top surface portion 5030, the peripheral surface portion 5031, and the peripheral surface portion 5032 of the coil end cover 50 are at each circumferential position of the circumferential section, in a cross-sectional view ( Figure 1 ) can be formed into a substantially similar C-shape. However, in addition to the engaging claws 55 or engaging holes 58 described later, the coil end cover 50 may also have an oil inlet or outlet (not shown) at a local circumferential position or range, such as on the peripheral surface 5031. The coil end cover 50 forms the oil passage 80 using the C-shaped space formed by the top surface 5030, the peripheral surface 5031, and the peripheral surface 5032.

[0057] The radially outer circumferential surface portion 5031 is radially opposed to the radially outer side of the coil end portion 223 from the radially outer side over the entire circumference. The axially inner end of the radially outer circumferential surface portion 5031 engages with the core end face cover 60. The radially outer circumferential surface portion 5031 engages with the core end face cover 60 radially outward relative to the slot 216 (radially outward relative to the coil end portion 223).

[0058] Specifically, the radially outer peripheral surface portion 5031 is engaged with the radially outer upright peripheral surface portion 631 of the core end surface cover 60 by radially interfering with each other. In the illustrated example, the upright peripheral surface portion 631 radially presses the peripheral surface portion 5031 from the radially inner side toward the radially outer side. It should be noted that the peripheral surface portion 5031 and the upright peripheral surface portion 631 may also be engaged with radially protruding portions engaging with radially recessed portions.

[0059] The radially inner circumferential surface portion 5032 is radially opposed to the radially inner side of the coil end portion 223 from the radially inner side over the entire circumference. The axially inner end of the radially inner circumferential surface portion 5032 engages with the core end face cover 60. The radially inner circumferential surface portion 5032 engages with the core end face cover 60 radially inwardly of the coil wire 22 in the slot 216.

[0060] Specifically, the radially inner peripheral surface portion 5032 is engaged with the radially inner upright peripheral surface portion 632 of the core end surface cover 60 by radially interference fitting. In the illustrated example, the upright peripheral surface portion 632 radially presses the peripheral surface portion 5032 from the radially outer side toward the radially inner side. It should be noted that the peripheral surface portion 5032 and the upright peripheral surface portion 632 may also be engaged with radial protrusions fitting into radial recesses.

[0061] Thus, in this embodiment, the coil end cover 50 and the core end face cover 60 are connected to each other via a connecting portion utilizing interference fit (hereinafter also referred to as "first interference fit portion 71") on the radially outer side of the annular oil passage 80, and via a connecting portion utilizing interference fit (hereinafter also referred to as "second interference fit portion 72") on the radially inner side of the oil passage 80. Since the first interference fit portion 71 and the second interference fit portion 72 are formed over the entire circumference, high sealing performance can be ensured throughout the entire annular oil passage 80.

[0062] In this embodiment, the first and second interference fit portions 71 and 72 are arranged so as to overlap the stator core 211 when viewed in the axial direction. This allows the coil end cover 50 and the core end face cover 60 to be arranged and connected without increasing the overall radial dimension of the motor 1.

[0063] In addition, in the present embodiment, the first interference fitting portion 71 overlaps with the coil end portion 223 (coil wire 22) when viewed in the axial direction. Specifically, in the present embodiment, as described above, the coil end portion 223 has a shape that tilts from the axial outer side to the radial outer side, and the first interference fitting portion 71 can be configured by utilizing the dead space (Dead space) formed by such a coil end portion 223. It should be noted that, in a modified example, the second interference fitting portion 72 can replace the first interference fitting portion 71 or in addition to the first interference fitting portion 71 and overlap with the coil end portion 223 (coil wire 22) when viewed in the axial direction. In this case, the second interference fitting portion 72 can be located at a position closer to the axial outer side than the axial position shown in the figure, and radially opposed from the radial inner side to the axial outer end portion of the coil end portion 223.

[0064] The core end face cover 60 is annular and covers the axial end face of the stator core 211. The core end face cover 60 has a base surface 630 that is in surface contact with the axial end face of the stator core 211.

[0065] The core end face cover 60 is provided with upright peripheral surface portions 631 and 632 and a flange portion 68 extending axially outward from the base surface 630. Specifically, the core end face cover 60 has an upright peripheral surface portion 632 on its radially inner edge portion, and, in addition to the upright peripheral surface portion 631, a flange portion 68 on its radially outer edge portion (outer peripheral edge portion) on its radially outer side. The flange portion 68 is located radially further outward than the upright peripheral surface portion 631. The flange portion 68 and the upright peripheral surface portion 631 cooperate to form a recess 69 that is recessed axially inward. The axially inner end portion of the radially outer peripheral surface portion 5031 of the coil end cover 50 is inserted into the recess 69. In this case, the axially inner end portion of the radially outer peripheral surface portion 5031 of the coil end cover 50 is radially covered by the flange portion 68 from the radially outer side. In this case, even if the peripheral surface portion 5031 is displaced radially outward due to the internal pressure of the oil passage 80, etc., it is retained from the radial outward by the flange portion 68. Therefore, even if the amount of interference in the first interference fit portion 71 is reduced due to the internal pressure, etc., the radially outward connection between the coil end cover 50 and the core end face cover 60 can be maintained.

[0066] It should be noted that the radial width of the recessed portion 69 formed by the flange portion 68 and the upright peripheral surface portion 631 may be substantially the same as the thickness of the radially outer peripheral surface portion 5031 of the coil end cover 50 .

[0067] The flange portion 68 can be provided over the entire circumference, but is preferably provided within a circumferential range that avoids the fixed portion 2118 of the stator core 211. In this case, the fixed portion 2118 can be reduced radially inward by an amount corresponding to the flange portion 68, thereby reducing the radial size of the stator 21. Furthermore, in this case, since the flange portion 68 can be arranged over a relatively wide circumferential range, the aforementioned function of the flange portion 68 (the function of suppressing radially outward displacement of the radially outer circumferential surface portion 5031 of the coil end cover 50) can be maintained over a relatively wide circumferential range.

[0068] As described above, the core end face cover 60 has an axial through hole 62 at a circumferential position corresponding to each slot 216 on the base surface 630. The through hole 62 is arranged radially between the upright circumferential surface portion 632 and the upright circumferential surface portion 631. The through hole 62 is provided to allow the coil wire 22 to extend from the inside of the slot 216 to the radial outside of the stator core 211. Therefore, a gap is formed between the inner circumferential wall of the through hole 62 and the coil wire 22. However, in this embodiment, a foam insulator 24 is arranged in the through hole 62 on the core end face cover 60. Therefore, the foam insulator 24 can fill the gap between the inner circumferential wall of the through hole 62 and the coil wire 22. As a result, it is difficult for the oil in the oil circuit 80 to enter the slot 216 through the through hole 62, and the amount of oil in the oil circuit 80 leaking into the slot 216 can be eliminated or reduced. It should be noted that even if oil leaks into the groove 216, the foamed insulator 24 actually blocks the radially inner opening of the groove 216, thereby preventing the oil from leaking further from the radially inner opening of the groove 216 into the radial direction between the stator 21 and the rotor 30. This prevents friction loss caused by oil leaking radially between the stator 21 and the rotor 30.

[0069] In the present embodiment, the coil end cover 50 and the core end face cover 60 are further connected via a radial first snap-fit ​​portion 73 and a radial second snap-fit ​​portion 74. In the present embodiment, the first snap-fit ​​portion 73 and the second snap-fit ​​portion 74 are arranged on the radial outside of the annular oil passage 80, but the first snap-fit ​​portion 73 and / or the second snap-fit ​​portion 74 can also be arranged on the radial inside of the annular oil passage 80 instead of or in addition to them.

[0070] The first snap-fit ​​portion 73 and the second snap-fit ​​portion 74 are provided at different positions in the circumferential direction, and the radial positional relationship between the snap-fitting claws and the snap-fitting holes is the same.

[0071] Specifically, the first snap-fit ​​portion 73 is a snap-fit ​​portion between the radially outward-facing snap-fit ​​claw 55 on the coil end cover 50 and the snap-fit ​​hole 65 on the core end face cover 60. In this case, during assembly, the snap-fit ​​claw 55 first elastically deforms radially inward and then enters the snap-fit ​​hole 65, thereby elastically returning to its original position and achieving a snap-fit. It should be noted that the snap-fit ​​hole 65 is formed on the peripheral wall of the flange portion 68 of the core end face cover 60.

[0072] It should be noted that if Figure 10As shown, the portion of the coil end cover 50 including the engaging claw 55 may also be surrounded by a cutout. That is, cutouts may be formed on both circumferential sides of the portion including the engaging claw 55. In this case, elastic deformation of the portion including the engaging claw 55 toward the radial inner side becomes easy. That is, assembly performance is good. In addition, a material thinning portion 64 (see FIG. 1 ) that enables the engaging claw 55 to deform toward the radial inner side during assembly may also be formed on the core end face cover 60. Figure 8 ).

[0073] The first snap-fitting portion 73 is preferably provided at multiple locations along the circumferential direction. Figure 7 、 Figure 9 It can be seen that a total of three locations are provided at intervals of 120 degrees.

[0074] The second snap-fit ​​portion 74 is a snap-fit ​​portion between the radially outward-facing snap-fit ​​claw 67 on the core end face cover 60 and the snap-fit ​​hole 58 on the coil end cover 50. In this case, during assembly, the snap-fit ​​claw 67 is temporarily elastically deformed radially inward and then enters the snap-fit ​​hole 58, thereby elastically returning to its original position and achieving snap-fit.

[0075] It should be noted that if Figure 11 As shown, the portion of the coil end cover 50 including the engagement hole 58 can also be surrounded by a notch. Specifically, notches can be formed on both circumferential sides of the portion including the engagement hole 58. In this case, elastic deformation of the portion including the engagement hole 58 toward the radial outward direction becomes easier. Specifically, during assembly, the portion including the engagement hole 58 temporarily elastically deforms toward the radial outward direction, then elastically returns to its original position by receiving the engagement claws 67, achieving a snap fit.

[0076] The second snap-fitting portion 74 is preferably provided at multiple locations along the circumferential direction. Figure 7 、 Figure 9 It can be seen that the second snap-fit ​​portion 74 is provided at a total of three locations at intervals of 120 degrees.

[0077] like Figure 11 As shown, the second snap-fit ​​portion 74 can also be provided in phase with the fixing portion 2118. Since the flange portion 68 is not provided within the circumferential range of the fixing portion 2118, the elastic deformation of the coil end cover 50 toward the radial outside (including the elastic deformation of the portion of the engaging hole 58) becomes easy.

[0078] Thus, according to this embodiment, in addition to the two radially inner and outer interference fit portions (i.e., the first interference fit portion 71 and the second interference fit portion 72) described above, a first snap-fit ​​portion 73 and a second snap-fit ​​portion 74 are also provided. This effectively reduces the possibility of the connection between the coil end cover 50 and the core end face cover 60 being released (i.e., the possibility of the coil end cover 50 being detached from the core end face cover 60). In particular, as described above, the radial positional relationship between the engaging claws and the engaging holes involved in the snap fit of the first snap-fit ​​portion 73 and the second snap-fit ​​portion 74 is identical. That is, in this embodiment, the engaging claws 55 and 67 are located at the same radially inner side relative to the engaging holes 65 and 58, respectively. This maintains the connection between the coil end cover 50 and the core end face cover 60. For example, deformation of the first snap-fit ​​portion 73 in the direction of release becomes deformation in the direction of promoting (reinforcing) the engagement of the second snap-fit ​​portion 74, and vice versa. This significantly reduces the possibility of the coil end cover 50 and the core end face cover 60 being disconnected (i.e., detached). It should be noted that to maximize this effect, the first snap-fit ​​portion 73 and the second snap-fit ​​portion 74 can be positioned relatively close to each other in the circumferential direction. In other words, the first snap-fit ​​portion 73 and the second snap-fit ​​portion 74 can also be positioned adjacent to each other in the circumferential direction.

[0079] Furthermore, in this embodiment, the first snap-fit ​​portion 73 and / or the second snap-fit ​​portion 74 may also be disposed within a range overlapping the stator core 211 when viewed axially. This allows the coil end cover 50 and the core end face cover 60 to be securely connected without increasing the overall radial dimension of the motor 1.

[0080] In addition, in the present embodiment, the first snap-fit ​​portion 73 and / or the second snap-fit ​​portion 74 may also be arranged within a range that overlaps with the coil end portion 223 (coil wire 22) when viewed axially. Specifically, in the present embodiment, as described above, the coil end portion 223 has a shape that tilts from the axial outer side toward the radial outer side, and the first snap-fit ​​portion 73 and / or the second snap-fit ​​portion 74 can be arranged using the inactive space formed by such a coil end portion 223.

[0081] Next, refer to Figures 12 to 14 , a method for manufacturing the stator 21 of the present embodiment is summarized, and in connection therewith, a relationship between the core end surface cover 60 and the foamed insulator 24 is described in detail.

[0082] Figure 12 1 is a cross-sectional view of the stator 21 in an assembled state, and is a cross-sectional view of the stator 21 taken along a plane passing through the rotating shaft 12 (a cross-sectional view of only one side with respect to the rotating shaft 12 ). Figure 12 It is a cross-sectional view at a circumferential position through the groove 216 . Figure 13 yes Figure 12An enlarged view of part B, Figure 14 It is along Figure 12 A cross-sectional view of line CC. Figures 12 to 14 In FIG. 1 , the foamed insulating paper (fluted paper) 240 used to form the foamed insulating body 24 is shown in its state before foaming.

[0083] In this embodiment, the core end face cover 60 is fixed to the stator core 211 by being engaged with the foamed insulator 24 fixed in the slot 216 of the stator core 211 .

[0084] As described above, foamed insulation 24 is formed from foamed insulation paper (fluted paper) 240. Foamed insulation paper 240 may contain, for example, a thermosetting component in addition to a foaming component that foams when heated. In this case, foamed insulation 24 can be bonded to surrounding areas (such as core end cover 60) after foaming.

[0085] In the manufacturing process, such as Figure 13 As shown, foamed insulation paper 240 is inserted into slots 216 of stator core 211 with its axial end positioned within through-hole 62 of core end cover 60. At this point, foamed insulation paper 240 preferably remains within through-hole 62 and does not extend axially outward from core end cover 60. That is, foamed insulation paper 240 preferably extends axially outward from slots 216 of stator core 211 and terminates within through-hole 62 of core end cover 60 (at a position radially overlapping through-hole 62). This allows foamed insulation 24 to be formed, after foaming, to adhere to a wide area of ​​the inner circumferential wall of through-hole 62, thereby enhancing the securing strength of foamed insulation 24 to core end cover 60. Furthermore, since foamed insulation 24 does not extend axially outward from core end cover 60, the surface area of ​​coil wire 22 that comes into contact with the oil in oil passage 80 (surface area capable of effectively dissipating heat) can be maximized.

[0086] It should be noted that in the comparative example in which the foamed insulating paper 240 is inserted into the slot 216 of the stator core 211 so as to terminate within the slot 216, when the foamed insulating paper 240 foams, the foaming material easily enters between the core end face cover 60 and the axial end face of the stator core 211. In contrast, according to this embodiment, the foamed insulating paper 240 is inserted into the slot 216 so as to terminate axially outward of the slot 216 of the stator core 211, thereby reducing the possibility of such a problem.

[0087] Here, in this embodiment, the through hole 62 of the core end face cover 60 may also be of the same shape as the groove 216, but is preferably different from the groove 216 and does not have a radially inner opening. That is, the through hole 62 is preferably in a form that is closed radially inward. In this case, when the foamed insulating paper 240 is foamed, the possibility of the foaming material leaking radially inward from the through hole 62 can be prevented. In other words, the gap around the coil wire 22 in the through hole 62 can be reliably filled by the foaming of the foamed insulating paper 240, and the necessity of additionally providing a sealing component on the radial inner side of the core end face cover 60 (for example, in the case of a radial opening, a sealing component for sealing the opening) can be eliminated.

[0088] During the manufacturing process, the foamed insulating paper 240 is inserted into the groove 216 in a cylindrical shape with the ends overlapping each other. At this time, the foamed insulating paper 24 is preferably inserted in a manner such that the overlapping ends are located radially outside the groove 216. Figure 14 This reduces the possibility of the foamed insulator 24 protruding radially inward from the radially inner opening of the groove 216 relative to the front end of the tooth portion 214, and effectively increases the engagement range of the foamed insulator 24 with the core end cover 60 described later.

[0089] While each embodiment has been described in detail above, the present invention is not limited to the specific embodiments and various modifications and variations are possible within the scope of the claims. In addition, all or a plurality of the constituent elements of the above embodiments may be combined.

[0090] In addition to the above disclosure, the following contents are also disclosed.

[0091] [Note 1]

[0092] A rotating electrical machine comprising:

[0093] an iron core having a plurality of teeth;

[0094] a coil wire wound around the core so as to be inserted into slots formed circumferentially between the plurality of teeth and forming a coil end portion axially outward relative to an axial end surface of the core;

[0095] a first cover member covering the coil end portion from an axially outer side, a radially inner side, and a radially outer side;

[0096] a second cover member covering an axial end surface of the core; and

[0097] a refrigerant space located between the first cover member and the second cover member,

[0098] In a cross-sectional view taken along a plane along the central axis of the core, the first cover member and the second cover member are connected to each other via a first connecting portion on a radially outer side of the refrigerant space and are connected to each other via a second connecting portion on a radially inner side of the refrigerant space.

[0099] At least one of the first connection portion and the second connection portion is arranged in a range overlapping with the core when viewed in the axial direction.

[0100] [Note 2]

[0101] According to the rotary electric machine according to Supplementary Note 1, the first connecting portion or the second connecting portion overlaps with the coil end portion when viewed in the axial direction.

[0102] [Note 3]

[0103] According to the rotating electrical machine of Supplementary Note 1 or 2, the first connecting portion includes a first radial snap-fit ​​portion and a second radial snap-fit ​​portion,

[0104] The first snap-fit ​​portion is formed by a first engaging claw provided on the first cover member and a second engaging hole provided on the second cover member.

[0105] The second snap-fit ​​portion is formed by a first engaging hole provided on the first cover member and a second engaging claw provided on the second cover member.

[0106] The first snap-fit ​​portion and the second snap-fit ​​portion are provided at different circumferential positions, and the radial positional relationship between the first engaging claw and the second engaging hole is the same as the radial positional relationship between the second engaging claw and the first engaging hole.

[0107] [Note 4]

[0108] The rotating electrical machine according to any one of Supplementary Notes 1 to 3, wherein the refrigerant space has a circular ring shape when viewed in the axial direction,

[0109] The first connecting portion includes a radial interference fit portion,

[0110] The interference fit portion is provided over the entire circumference.

[0111] [Note 5]

[0112] The rotating electrical machine according to any one of Supplementary Notes 1 to 4, wherein the second cover member has a recessed portion recessed axially inward at a radially outer end portion.

[0113] An axially inner end portion of the first cover member on the radially outer side is fitted into the recess.

[0114] [Note 6]

[0115] According to the rotating electrical machine described in Supplementary Notes 3 and 5, the recessed portion is arranged within a first circumferential range in the entire circumference.

[0116] The first snap-fit ​​portion and the second snap-fit ​​portion are arranged in a second circumferential range different from the first circumferential range.

[0117] [Note 7]

[0118] The rotating electrical machine according to Supplementary Note 6, wherein the iron core has a fixing portion for fixing to the housing at one or more circumferential positions on the outer periphery and at a circumferential position within the second circumferential range.

[0119] Captions

[0120] 1: Motor (rotating motor), 211: Stator core (iron core), 2118: Fixing part, 214: Tooth part, 216: Slot, 22: Coil wire, 223: Coil end part, 80: Oil circuit (refrigerant space), 50: Coil end cover (first cover part), 60: Core end face cover (second cover part), 69: Recess, 71: First interference fit part (first connecting part), 72: Second interference fit part 73, First snap fit part (first connecting part), 74: Second snap fit part (second connecting part), 55: Engaging claw, 58: Engaging hole, 65: Engaging hole, 67: Engaging claw.

Claims

1. A rotating electrical machine, wherein: have: an iron core having a plurality of teeth; a coil wire wound around the core so as to be inserted into slots formed circumferentially between the plurality of teeth and forming a coil end portion axially outward relative to an axial end surface of the core; a first cover member covering the coil end portion from an axially outer side, a radially inner side, and a radially outer side; a second cover member covering an axial end surface of the core; and a refrigerant space located between the first cover member and the second cover member, In a cross-sectional view taken along a plane passing through the central axis of the core, the first cover member and the second cover member are connected to each other via a first connecting portion on a radially outer side of the refrigerant space and are connected to each other via a second connecting portion on a radially inner side of the refrigerant space. At least one of the first connection portion and the second connection portion overlaps with the core when viewed in the axial direction.

2. The rotating electrical machine according to claim 1, wherein The first connecting portion or the second connecting portion overlaps with the coil end when viewed in the axial direction.

3. The rotating electrical machine according to claim 1, wherein One of the first connection portion and the second connection portion includes a radial snap-fit ​​portion and a radial interference fit portion, and the other of the first connection portion and the second connection portion includes a radial interference fit portion.

4. The rotating electrical machine according to any one of claims 1 to 3, wherein: The refrigerant space has an annular shape when viewed axially. The first connecting portion includes a radial interference fit portion, The interference fit portion is provided over the entire circumference.

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