Motor

Abstract

The motor includes: a rotor; the stator is positioned on the radial outer side of the rotor; and a bus bar assembly located on one side of the stator in the axial direction. The insulator of the stator has an inner insulator portion located radially inward of the coil. The bus bar assembly includes: a bus bar; and a bus bar holder that holds the bus bar. The bus bar holder has an annular holder body portion surrounding a central axis. The bus bar has a coil connection portion connected to a coil lead-out wire led out from the coil. The coil connection portion protrudes radially outward from the holder body portion. A portion of one of the inner insulator portion and the bus bar holder has a first recessed portion. A portion of the other of the inner insulator portion and the bus bar holder has a first protruding portion. At least a portion of the first convex portion is inserted into the first concave portion. The bus bar holder is supported by the inner insulator portion in the axial direction.

Description

Technical Field

[0001] This invention relates to a motor. Background Technology

[0002] Motors with a resin mold body for holding a busbar are known (e.g., Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2009-290921 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In motors like those described above, for example, to facilitate the connection between the busbar and the coil, a structure is sometimes adopted in which the portion of the busbar that connects to the coil protrudes radially outward from the busbar holder, such as the resin casting. In such a structure, a leg protruding radially outward is sometimes provided in the busbar holder, allowing the busbar holder to be supported radially outward of an insulating member in the stator via this leg. However, in this case, it can be difficult to stably support the busbar holder on the stator.

[0008] In view of the above, one of the objectives of this invention is to provide a motor having a structure that can stably support the busbar retainer.

[0009] Solution for solving the problem

[0010] One aspect of the present invention comprises a motor including: a rotor rotatable about a central axis; a stator located radially outward of the rotor; and a busbar assembly located axially on one side of the stator. The stator includes: a stator core; an insulator mounted on the stator core; and a coil mounted on the stator core, separated from the insulator. The insulator has an inner insulator portion located radially inward of the coil. The busbar assembly includes: a busbar; and a busbar holder holding the busbar. The busbar holder has an annular holder body portion surrounding the central axis. The busbar has a coil connection portion connected to a coil lead extending from the coil. The coil connection portion protrudes radially outward from the holder body portion. A portion of the inner insulator portion and the busbar holder has a first recess. A portion of the other inner insulator portion and the busbar holder has a first protrusion. At least a portion of the first recess is inserted into the first recess. The busbar retainer is axially supported by the inner insulating portion.

[0011] Invention Effects

[0012] According to one aspect of the invention, for example, in a motor, a busbar retainer can be stably supported. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view showing the motor in the first embodiment.

[0014] Figure 2 This is a view of the stator and busbar assembly in the first embodiment from above.

[0015] Figure 3 This is a perspective view showing a portion of the insulating member and a portion of the busbar retainer in the first embodiment.

[0016] Figure 4 This is a cross-sectional view showing a portion of the motor in the first embodiment.

[0017] Figure 5 This is a perspective view showing a portion of the busbar retainer in the first embodiment.

[0018] Figure 6 This is a cross-sectional view showing a portion of the motor in the second embodiment.

[0019] Figure 7 This is a perspective view showing a portion of the insulating member and a portion of the busbar retainer in the second embodiment.

[0020] Figure 8 This is a cross-sectional view showing a portion of the motor in the third embodiment.

[0021] Figure 9 This is a perspective view showing a portion of the insulating member in the third embodiment.

[0022] Figure 10 This is a perspective view showing a portion of the busbar retainer in the third embodiment.

[0023] Figure 11 This is a cross-sectional view showing a portion of the motor in the fourth embodiment.

[0024] Figure 12 This is a perspective view showing a portion of the insulating member in the fourth embodiment.

[0025] Figure 13 This is a perspective view showing a portion of the busbar retainer in the fourth embodiment.

[0026] Figure 14 This is an exploded perspective view showing a portion of the motor in the fifth embodiment. Detailed Implementation

[0027] The central axis J of the motor in the embodiments described below is shown virtually in each figure. In the following description, unless otherwise specified, the axial direction of the central axis J is simply referred to as "axial," the radial direction centered on the central axis J is simply referred to as "radial," and the circumferential direction centered on the central axis J is simply referred to as "circumferential." The Z-axis shown in each figure indicates the direction in which the central axis J extends. In the following description, the side pointed to by the arrow of the Z-axis in the axial direction (+Z side) is referred to as the "upper side," and the side opposite to the side pointed to by the arrow of the Z-axis in the axial direction (-Z side) is referred to as the "lower side."

[0028] In the following implementation, the upper side corresponds to "one side of the axial direction" and the lower side corresponds to "the other side of the axial direction". It should be noted that the upper side and the lower side are only names used to describe the relative positional relationship of each part. The actual configuration relationship may also be a configuration relationship other than that indicated by these names.

[0029] <First Implementation>

[0030] like Figure 1 As shown, the motor 100 of this embodiment includes a housing 10, a rotor 20, a stator 30, a busbar assembly 40, and a control device 80. The housing 10 internally houses the rotor 20, the stator 30, the busbar assembly 40, and the control device 80. The rotor 20 is rotatable about a central axis J. The rotor 20 has a shaft 21 and a rotor body 22. The shaft 21 is cylindrical, extending axially about the central axis J. The shaft 21 is supported by a pair of bearings 11 and 12 to allow rotation about the central axis J. The bearing 11 is held in the lower wall of the housing 10. The bearing 12 is held by a bearing retainer 13 disposed within the housing 10. The bearing retainer 13 is located above the stator 30 and the busbar assembly 40, and below the control device 80. The rotor body 22 is fixed to the outer circumferential surface of the shaft 21. Although the illustration is omitted, the rotor body 22 has: a rotor core, fixed to the rod body 21; and a magnet, fixed to the rotor core.

[0031] The stator 30 is located radially outside the rotor 20. The stator 30 is annular around the rotor 20. In this embodiment, the stator 30 is approximately annular about the central axis J. The stator 30 includes a stator core 31, an insulator 50, and a coil 32.

[0032] The stator core 31 has a core back 31a and multiple teeth 31b. For example... Figure 2As shown, the core back 31a is annular around the central axis J. In this embodiment, the core back 31a is approximately annular about the central axis J. A plurality of teeth 31b extend radially inward from the core back 31a. The plurality of teeth 31b are spaced apart in the circumferential direction. More specifically, the plurality of teeth 31b are arranged at equal intervals around the circumference. Each tooth 31b has a tooth body portion 31c and a vent portion 31d. The tooth body portion 31c extends radially inward from the radially inner side of the core back 31a. The vent portion 31d is connected to the radially inner end of the tooth body portion 31c. The vent portion 31d protrudes circumferentially to both sides of the tooth body portion 31c. The radially inner side of the vent portion 31d is the radially inner side of the tooth 31b, and is radially opposed to the radially outer side of the rotor body 22 with a gap.

[0033] In this embodiment, the stator core 31 is configured as a ring by connecting multiple core segments 31p that are divided in the circumferential direction in the circumferential direction. Each of the multiple core segments 31p has a circumferential portion of the core back 31a and a tooth 31b.

[0034] An insulating member 50 is mounted on the stator core 31. The insulating member 50 is an insulating component. In this embodiment, the insulating member 50 is made of resin. In this embodiment, the insulating member 50 has a plurality of insulating member segments 50p. The plurality of insulating member segments 50p are arranged circumferentially. The plurality of insulating member segments 50p are arranged at equal intervals around the circumference. The plurality of insulating member segments 50p are respectively mounted on a plurality of teeth 31b. In this embodiment, the plurality of insulating member segments 50p are separate from each other. It should be noted that the plurality of insulating member segments 50p can also be connected to each other circumferentially. Although not shown in the figure, each insulating member segment 50p is composed of two components that are divided axially. These two components are, for example, components of the same shape, arranged in opposite directions axially.

[0035] like Figure 1 As shown, the multiple insulating segments 50p each have a toothed cover portion 51, an inner sidewall portion 52p, and an outer sidewall portion 53p. The toothed cover portion 51 is mounted on the tooth 31b. The toothed cover portion 51 covers the tooth 31b from both axial and circumferential sides. The toothed cover portion 51 is generally cylindrical around the tooth 31b about an axis extending in the direction along which the tooth 31b extends. A coil 32 is mounted on the toothed cover portion 51. Figure 3 As shown, a groove 51a extending axially is provided on the circumferential side of the toothed cover portion 51. The grooves 51a are arranged radially on both sides of the circumferential side of the toothed cover portion 51, and multiple grooves 51a are provided on each side.

[0036] like Figure 1As shown, the inner wall portion 52p is connected to the radially inner end of the toothed cover portion 51. The inner wall portion 52p is located radially inner than the coil 32. The inner wall portion 52p protrudes axially to both sides from the toothed cover portion 51. Figure 3 As shown, the inner sidewall portion 52p protrudes circumferentially to both sides of the tooth cover portion 51. When viewed axially, the inner sidewall portion 52p is an arc extending circumferentially. In this embodiment, the radial dimension of the inner sidewall portion 52p remains uniform throughout the circumference. It should be noted that the radial dimension of the inner sidewall portion 52p can also vary depending on its circumferential position. For example, the radial dimension of the inner sidewall portion 52p can increase as it moves away from the circumferential center of the inner sidewall portion 52p towards both circumferential sides.

[0037] like Figure 1 As shown, the inner wall portion 52p has a first inner protrusion 52a and a second inner protrusion 52b. The first inner protrusion 52a is the portion of the gear-mounted cover portion 51 in the inner wall portion 52p that protrudes upward. The second inner protrusion 52b is the portion of the gear-mounted cover portion 51 in the inner wall portion 52p that protrudes downward. Figure 3 As shown, in this embodiment, the first inner protrusion 52a is plate-shaped with its surface facing radially. The first inner protrusion 52a has an arc shape that extends circumferentially when viewed axially. The second inner protrusion 52b has a shape that is symmetrical to the first inner protrusion 52a in the axial direction.

[0038] like Figure 2 As shown, the inner wall portions 52p of a plurality of insulating element segments 50p are arranged in the circumferential direction. A gap is provided between adjacent inner wall portions 52p in the circumferential direction. In this embodiment, the inner insulating element portion 52 is constituted by a plurality of inner wall portions 52p. That is, the insulating element 50 has an inner insulating element portion 52, and the inner insulating element portion 52 has each of the inner wall portions 52p of the plurality of insulating element segments 50p. The inner insulating element portion 52 is located radially inward from the coil 32. In this embodiment, the inner insulating element portion 52 is approximately annular about the central axis J.

[0039] like Figure 3 As shown, the inner insulating portion 52 has a first recess 54. In this embodiment, the first recess 54 is provided at the upper end of the first inner protrusion 52a. The first recess 54 is recessed downward from the upper end face of the first inner protrusion 52a. The first recess 54 extends radially through the first inner protrusion 52a. The first recess 54 opens radially inward and radially outward. The interior of the first recess 54 is rectangular when viewed radially. In this embodiment, the first recess 54 is provided at the circumferential center of the first inner protrusion 52a. The circumferential center of the first recess 54 is located at the same position as the circumferential center of the first inner protrusion 52a.

[0040] The inner surface of the first recess 54 has a pair of side surfaces 54a and 54b and a bottom surface 54c. The bottom surface 54c is the lower portion of the inner surface of the first recess 54. The bottom surface 54c faces upward. In this embodiment, the bottom surface 54c is a flat surface orthogonal to the axial direction. The pair of side surfaces 54a and 54b are portions of the inner surface of the first recess 54 located on opposite sides in the circumferential direction. The pair of side surfaces 54a and 54b face circumferentially. The pair of side surfaces 54a and 54b are flat surfaces orthogonal to the circumferential direction. The pair of side surfaces 54a and 54b are circumferentially opposed to each other with a gap. The pair of side surfaces 54a and 54b extend upward from the edges on opposite sides of the bottom surface 54c in the circumferential direction. The upper ends of the pair of side surfaces 54a and 54b are connected to the upper ends of the first inner protrusion 52a. The pair of side surfaces 54a and 54b sandwich the first protrusion 61, which will be described later, in the circumferential direction.

[0041] like Figure 2 As shown, in this embodiment, the first recesses 54 are respectively provided on the inner wall portion 52p of each insulating component segment 50p. That is, in this embodiment, the inner insulating component portion 52 has a plurality of first recesses 54. The plurality of first recesses 54 are arranged at intervals in the circumferential direction. The plurality of first recesses 54 are arranged at equal intervals around the circumference. By providing the first recesses 54 on each of the plurality of insulating component segments 50p, all of the plurality of insulating component segments 50p can be made to have the same shape. Therefore, unlike the case where the plurality of insulating component segments 50p include insulating component segments 50p with different shapes, the plurality of insulating component segments 50p can be manufactured separately using a single mold. As a result, the manufacturing cost of the insulating component 50 can be reduced, and the manufacturing cost of the motor 100 can be reduced. In addition, since it is not necessary to consider which tooth 31b the insulating component segment 50p with the first recesses 54 is installed on, the assembly workability of the stator 30 can be improved. It should be noted that the first recess 54 may not be provided on the inner wall portion 52p of each insulating component segment portion 50p, but only on the insulating component segment portion 50p that is axially opposite to the first protrusion 61 described later.

[0042] like Figure 1 As shown, the outer wall portion 53p is connected to the radially outer end of the tooth cover portion 51. The outer wall portion 53p is located radially outer than the coil 32. The outer wall portion 53p protrudes axially to both sides of the tooth cover portion 51. Although not shown in the figure, the outer wall portion 53p protrudes circumferentially to both sides of the tooth cover portion 51. Figure 2As shown, the outer wall portions 53p of a plurality of insulating member segments 50p are arranged in the circumferential direction. A gap is provided between adjacent outer wall portions 53p in the circumferential direction. In this embodiment, the outer insulating member portion 53 is constituted by a plurality of outer wall portions 53p. That is, the insulating member 50 has an outer insulating member portion 53. The outer insulating member portion 53 is located radially outward from the coil 32. In this embodiment, the outer insulating member portion 53 is in a generally annular shape centered on the central axis J.

[0043] Coil 32 is mounted on stator core 31 through insulating member 50. Multiple coils 32 are provided. Each coil 32 is mounted on multiple teeth 31b through toothed cover portions 51 of multiple insulating member segments 50p. Each coil 32 is constructed by winding a conductor around the toothed cover portion 51 attached to the tooth 31b. That is, each coil 32 is constructed by winding a conductor around the tooth 31b through insulating member segments 50p. A coil lead 32a is led upwards from at least one of the multiple coils 32. The coil lead 32a is formed by the end of the conductor constituting the coil 32. For example, the coil lead 32a is led upwards from six coils 32.

[0044] like Figure 1 As shown, the busbar assembly 40 is located on the upper side of the stator 30. The busbar assembly 40 is supported from the lower side by the stator 30. The busbar assembly 40 has a busbar retainer 60 and a busbar 70.

[0045] Busbar 70 is electrically connected to coil 32. Busbar 70 is a plate-shaped metal component. Figure 2 As shown, multiple busbars 70 are provided. In this embodiment, three busbars 70 are provided. Each busbar 70 has a busbar body portion 71, a coil connection portion 72, and a terminal portion 73. The busbar body portion 71 is held in a busbar holder 60. In this embodiment, the busbar body portion 71 is embedded in and held in the busbar holder 60. More specifically, the busbar body portion 71 is embedded in and held in the holder body portion 63, which will be described later. The busbar body portion 71 is plate-shaped with its plate surface facing axially. The busbar body portion 71 has an arcuate portion 71a extending circumferentially and an extension portion 71b extending radially outward from the arcuate portion 71a. Each extension portion 71b of the multiple busbars 70 is arranged in a direction orthogonal to both the direction in which the terminal holder portion 64 protrudes from the busbar body portion 71 and the axial direction.

[0046] The coil connection portion 72 is the part that connects the coil lead 32a extending from the coil 32. The coil connection portion 72 extends radially outward from the busbar main body portion 71. More specifically, the coil connection portion 72 extends radially outward from the arc portion 71a. The coil connection portion 72 protrudes radially outward from the retaining member main body portion 63, described later. The coil connection portion 72 has an arm portion 72a and a pair of clamping portions 72b and 72c. The arm portion 72a extends radially outward from the radially outer edge of the busbar main body portion 71. The arm portion 72a is plate-shaped with its plate surface facing axially.

[0047] A pair of clamping portions 72b and 72c are connected to the radially outer ends of the arm portion 72a. The pair of clamping portions 72b and 72c are spaced apart in the circumferential direction. Through the radially outer ends of the arm portion 72a and the pair of clamping portions 72b and 72c, the radially outer ends of the coil connection portion 72 form a generally U-shaped opening towards the radially outward direction when viewed axially. The pair of clamping portions 72b and 72c clamp the coil lead wire 32a in the circumferential direction. The pair of clamping portions 72b and 72c are connected to the coil lead wire 32a, for example, by welding. It should be noted that the pair of clamping portions 72b and 72c can also be pressed together in the circumferential direction towards each other while clamping the coil lead wire 32a between them. In this embodiment, two coil connection portions 72 are provided in each busbar 70. Except for the radially inner end, the coil connection portion 72 is exposed to the outside of the busbar holder 60.

[0048] Terminal portion 73 extends upward from busbar body portion 71. More specifically, terminal portion 73 extends upward from the radially outer end of extension portion 71b. Terminal portion 73 is plate-shaped with its plate surface facing radially. Terminal portion 73 protrudes upward from terminal holding portion 64, described later. Figure 1 As shown, the upper end of terminal 73 is electrically connected to control device 80. Thus, coil 32 is electrically connected to control device 80 via busbar 70. Control device 80 has an inverter circuit that supplies power to coil 32. Power is supplied from control device 80 to each coil 32 via busbar 70. Terminal 73 passes axially through a hole (not shown) provided in bearing retainer 13. Figure 2 As shown, the terminal portions 73 of each busbar 70 are arranged in the direction in which the extension portions 71b of each busbar 70 are arranged.

[0049] Busbar retainer 60 holds busbar 70. In this embodiment, busbar retainer 60 is made of resin. Busbar retainer 60 is manufactured, for example, by molding busbar 70 as an insert for an embedded member. Busbar retainer 60 has a retainer body portion 63 and a terminal retainer portion 64. The retainer body portion 63 is annular around a central axis J. In this embodiment, the retainer body portion 63 is approximately annular about the central axis J. Figure 1 As shown, the retainer body 63 is located radially outward of the inner insulating member 52. More specifically, the lower end of the retainer body 63 is located radially outward of the upper end of the inner insulating member 52. The upper end of the inner insulating member 52 is inserted radially inward of the lower end of the retainer body 63. For example, the upper end of the inner insulating member 52 is clearance-fitted radially inward of the lower end of the retainer body 63.

[0050] The retaining member body 63 is axially opposed to the coil 32. The retaining member body 63 is located above the coil 32. Figure 4 As shown, more specifically, the retainer body 63 is located above the radially inner portion of the coil 32. A second recess 63a, recessed upwards, is provided on the lower surface of the retainer body 63, opposite the coil 32 in the axial direction. By providing the second recess 63a, contact between the retainer body 63 and the coil 32 is suppressed. In this embodiment, the second recess 63a is located radially outwards from the portion on the lower surface of the retainer body 63 compared to the portion where the second protrusion 62 (described later) is provided. The downward-facing surface of the second recess 63a is located on the upper side as it tends to be radially outwards. The downward-facing surface of the second recess 63a is curved when viewed circumferentially. It should be noted that the downward-facing surface of the second recess 63a may also be straight when viewed circumferentially.

[0051] like Figure 2 As shown, the terminal holding portion 64 protrudes radially outward from the holding body portion 63. The terminal holding portion 64 is generally cuboid in shape. The terminal holding portion 64 holds the extension portion 71b and the terminal portion 73 of each busbar 70. The terminal holding portion 64 is embedded in and holds the entire extension portion 71b and the lower end of the terminal portion 73.

[0052] like Figure 5 As shown, the busbar retainer 60 has a first protrusion 61. In this embodiment, the first protrusion 61 protrudes radially inward from a radially inward surface of the retainer body 63. The first protrusion 61 is located at the lower end of the radially inward surface of the retainer body 63. The first protrusion 61 is generally cuboid in shape. Figure 3As shown, at least a portion of the first protrusion 61 is inserted into the first recess 54. In this embodiment, the entire first protrusion 61 is inserted into the first recess 54. It should be noted that, alternatively, only a portion of the first protrusion 61 may be inserted into the first recess 54, with the other portion of the first protrusion 61 located outside the first recess 54. The first protrusion 61 contacts the bottom surface 54c. Thus, the busbar holder 60 is axially supported by the inner insulating portion 52 via the first protrusion 61. The lower surface of the first protrusion 61 is a flat surface orthogonal to the axial direction, contacting the bottom surface 54c from the top.

[0053] In this embodiment, as described above, the coil connection portion 72 protrudes radially outward from the main body portion 63, thus allowing the connection operation between the coil connection portion 72 and the coil lead 32a to be performed radially outward from the main body portion 63. This makes it easier to ensure a larger space for the connection operation compared to the case where the coil connection portion 72 protrudes radially inward from the main body portion 63. Therefore, contact between the clamps or other fixtures used during the connection operation and the busbar holder 60 and other coil connection portions 72 can be prevented, allowing the operator to easily perform the connection operation. It should be noted that in this specification, "operator, etc." includes the operator performing the various operations and the assembly device. Each operation can be performed by the operator alone, by the assembly device alone, or by both the operator and the assembly device.

[0054] Compared to the case where the coil connection portion 72 protrudes radially inward from the main body portion 63, the outer diameter of the main body portion 63 tends to be smaller when the coil connection portion 72 protrudes radially outward from the main body portion 63 as described above. In such a case, for example, it is possible to provide a leg extending radially outward from the main body portion 63 in the busbar holder 60, via which the busbar holder 60 is axially supported on the outer insulating portion 53. However, in this case, the support of the busbar holder 60 tends to become unstable. Therefore, the busbar holder 60 may deflect due to its own weight, external loads, stress, etc., causing the position of the busbar 70 held by the busbar holder 60 to shift. This results in problems such as the position of the terminal portion 73 shifting, making it difficult to connect the terminal portion 73 to the control device 80.

[0055] In contrast, according to this embodiment, by inserting at least a portion of the first protrusion 61 into the first recess 54, the busbar holder 60 is positioned relative to the inner insulating member 52, and the busbar holder 60 is axially supported on the inner insulating member 52. Therefore, compared to the case where the coil connection 72 protrudes radially outward from the holder body 63 and the busbar holder 60 is axially supported on the outer insulating member 53 via the aforementioned legs, the busbar holder 60 can be stably supported axially relative to the insulating member 50. Thus, according to this embodiment, the busbar holder 60 can be stably supported in the motor 100.

[0056] In this embodiment, the first protrusion 61 contacts the lower portion, i.e., the bottom surface 54c, of the inner surface of the first recess 54. Therefore, the busbar holder 60 can be axially supported on the inner insulating portion 52 by means of the first protrusion 61 inserted into the first recess 54. As a result, it is not necessary to provide portions of the busbar holder 60 that support the inner insulating portion 52 axially in other parts, thus suppressing the complication of the shape of the busbar holder 60.

[0057] The first protrusion 61 is sandwiched in the circumferential direction by a pair of side surfaces 54a, 54b on the inner surface of the first recess 54. Therefore, by inserting the first protrusion 61 into the first recess 54, the busbar holder 60 can be positioned in the circumferential direction relative to the inner insulating portion 52. In this embodiment, the first protrusion 61 mates with the first recess 54. This allows for a more appropriate circumferential positioning of the busbar holder 60 relative to the inner insulating portion 52. The first protrusion 61 may contact only one of the pair of side surfaces 54a, 54b, or both of the pair of side surfaces 54a, 54b, or may not contact either of the pair of side surfaces 54a, 54b.

[0058] As described above, in this embodiment, the retainer body 63 is located radially outward of the inner insulating member 52. The first recess 54 opens radially outward. The first protrusion 61 protrudes radially inward from the retainer body 63. Therefore, the inner insulating member 52 can be located radially inward of the retainer body 63, the retainer body 63 can be positioned radially relative to the inner insulating member 52 to a certain extent, and the first protrusion 61 can be easily inserted into the first recess 54. Compared to the case where the retainer body 63 is located entirely above the inner insulating member 52, when the inner insulating member 52 is located radially inward of the retainer body 63 as in this embodiment, the retainer body 63 is positioned axially closer to the coil 32. However, in this embodiment, as described above, by providing the second recess 63a on the lower surface of the retainer body 63, contact between the retainer body 63 and the coil 32 can be suppressed.

[0059] like Figure 2 As shown, in this embodiment, multiple first protrusions 61 are provided at intervals in the circumferential direction. The multiple first protrusions 61 are arranged at equal intervals around the circumference. In this embodiment, three first protrusions 61 are provided. Each of the multiple first protrusions 61 is inserted into a different first recess 54. Because the multiple first protrusions 61 are inserted into the first recesses 54, the busbar holder 60 can be more properly positioned relative to the inner insulating portion 52. In this embodiment, the busbar holder 60 can be more stably supported axially on the inner insulating portion 52 by the multiple first protrusions 61. The number of first protrusions 61 is less than the number of first recesses 54. Therefore, the multiple first recesses 54 include first recesses 54 for inserting the first protrusions 61 and first recesses 54 for not inserting the first protrusions 61.

[0060] like Figure 5 As shown, the busbar retainer 60 has a second protrusion 62 that projects axially. The second protrusion 62 protrudes downward from the retainer body portion 63. In this embodiment, the second protrusion 62 protrudes downward from the radially inner edge of the lower surface of the retainer body portion 63. The second protrusion 62 extends circumferentially. The radially inner surface of the second protrusion 62 is located at the same radial position as the radially inner surface of the retainer body portion 63. The radially inner surface of the second protrusion 62 is connected to the radially inner surface of the retainer body portion 63. In this embodiment, the second protrusion 62 is located on the lower surface of the portion of the retainer body portion 63 where the first protrusion 61 is located. The second protrusion 62 is not directly connected to the first protrusion 61.

[0061] like Figure 4 As shown, the second protrusion 62 contacts the inner insulating portion 52 radially. Therefore, the busbar holder 60 can be radially positioned relative to the inner insulating portion 52 via the second protrusion 62. In this embodiment, the second protrusion 62 contacts the inner insulating portion 52 from the radially outer side. The radially inner surface of the second protrusion 62 contacts the radially outer surface of the inner insulating portion 52. More specifically, the radially inner surface of the second protrusion 62 contacts the portion of the radially outer surface of the first inner protrusion 52a located below the first recess 54. The portion of the radially outer surface of the first inner protrusion 52a that contacts the radially inner surface of the second protrusion 62 includes the portion adjacent to the lower side of the first recess 54. The radially inner surface of the second protrusion 62 is a surface orthogonal to the radial direction and extending circumferentially.

[0062] For example, the radially outer portion of the radially inner side surface of the retainer body 63 located on the inner insulating portion 52 could be radially contacted with the inner insulating portion 52, thereby positioning the busbar retainer 60 radially relative to the inner insulating portion 52. However, in this case, the radially inner side surface of the retainer body 63 would need to be manufactured with high precision over a relatively wide circumferential area, potentially increasing the manufacturing cost of the busbar retainer 60. In contrast, by configuring the second protrusion 62 to contact the inner insulating portion 52 radially, only the portion of the second protrusion 62 that contacts the inner insulating portion 52, i.e., the radially inner side surface, needs to be manufactured with high precision. This suppresses the increase in the manufacturing cost of the busbar retainer 60.

[0063] like Figure 3 As shown, the circumferential dimension of the second protrusion 62 is larger than that of the first protrusion 61. Therefore, it is easier to increase the contact area between the second protrusion 62 and the inner insulating portion 52. This allows for a more stable radial positioning of the busbar holder 60 relative to the inner insulating portion 52. The second protrusion 62 protrudes further circumferentially than the first protrusion 61. In this embodiment, the circumferential center of the second protrusion 62 is located at the same position circumferentially as the circumferential center of the first protrusion 61.

[0064] like Figure 4 As shown, the radially outer surface of the second protrusion 62 has an inclined portion 62a that is located radially inward as it tends downward. Therefore, the portion of the radially outer surface of the second protrusion 62 near the lower side of the coil 32 can be located radially inward. This prevents the second protrusion 62 from contacting the coil 32. Therefore, it prevents the busbar holder 60 from tilting upward due to axial contact between the second protrusion 62 and the coil 32, and prevents the first protrusion 61 from contacting the bottom surface 54c of the first recess 54. Therefore, the busbar holder 60 can be more appropriately supported axially on the inner insulating portion 52 via the first protrusion 61. When the inner insulating portion 52 is located radially inward of the holder body portion 63 as in this embodiment, the second protrusion 62 is easily positioned near the coil 32. However, in this embodiment, by providing the inclined portion 62a on the radially outer surface of the second protrusion 62, contact between the second protrusion 62 and the coil 32 can be appropriately prevented. In this embodiment, the inclined portion 62a is the lower portion of the radially outer surface of the second protrusion 62. In this embodiment, the inclined portion 62a is a curved surface that protrudes radially outward and downward.

[0065] like Figure 2As shown, multiple second protrusions 62 are provided at intervals in the circumferential direction. The multiple second protrusions 62 are arranged at equal intervals around the circumference. In this embodiment, three second protrusions 62 are provided. Each of the multiple second protrusions 62 contacts the radially outer surface of a different inner wall portion 52p. The second protrusions 62 are provided for each of the first protrusions 61.

[0066] Hereinafter, embodiments different from the embodiments described above will be described. In the following descriptions of each embodiment, for configurations identical to those described earlier in the preceding descriptions of the embodiments, descriptions are sometimes omitted by appropriately using the same reference numerals, etc. Furthermore, for parts corresponding to each component of the configuration described earlier in the preceding descriptions of the embodiments, the same names are used, but different reference numerals are used. Points that differ from the above configurations will be described, while points identical to the above configurations will sometimes be omitted. It should be noted that configurations omitted in the following embodiments may be identical to those described earlier in the preceding descriptions of the embodiments, provided there is no contradiction.

[0067] <Second Implementation>

[0068] like Figure 6 and Figure 7 As shown, in the busbar assembly 240 of the motor 200 of this embodiment, the busbar holder 260 has a first protrusion 261 and a second protrusion 262. In this embodiment, the first protrusion 261 protrudes downward from the holder body portion 263. More specifically, the first protrusion 261 protrudes downward from the radially inner edge portion of the lower surface of the holder body portion 263. The holder body portion 263 is the same as the holder body portion 63 of the first embodiment, except that it does not have the second recess 63a. The radially inner surface of the first protrusion 261 is provided at the same radially inner surface as the radially inner surface of the holder body portion 263. The radially inner surface of the first protrusion 261 is connected to the radially inner surface of the holder body portion 263.

[0069] The first protrusion 261 is generally cuboid in shape and extends axially. At least a portion of the first protrusion 261 is inserted into the first recess 54. In this embodiment, the lower portion of the first protrusion 261 is inserted into the first recess 54. The upper portion of the first protrusion 261 is located above the first recess 54. The lower surface of the first protrusion 261 contacts the bottom surface 54c of the first recess 54. Thus, the busbar holder 260 is axially supported by the inner insulating portion 52.

[0070] The second protrusion 262 protrudes downward from the main body 263 of the retainer. The second protrusion 262 is located radially outward of the first protrusion 261. The second protrusion 262 is connected to the radially outward surface of the first protrusion 261. The second protrusion 262 is generally cuboid in shape, extending axially. The second protrusion 262 protrudes downward more than the first protrusion 261. Figure 7 As shown, in this embodiment, the circumferential dimension of the second protrusion 262 is the same as that of the first protrusion 261. The portion of the second protrusion 262 located lower than the first protrusion 261 contacts the inner insulating portion 52 from the radially outer side. In this embodiment, the second protrusion 262 contacts the portion of the radially outer surface of the first inner protrusion 52a adjacent to the lower side of the first recess 54. Figure 6 As shown, the second protrusion 262 also has an inclined portion 262a, similar to that in the first embodiment. The inclined portion 262a is provided on the radially outer side of the portion of the second protrusion 262 located below the first protrusion 261. The other configurations of the inclined portion 262a are the same as those of the inclined portion 62a in the first embodiment.

[0071] The other configurations of the busbar assembly 240 are the same as those of the busbar assembly 40 in the first embodiment. The other configurations of the motor 200 are the same as those of the motor 100 in the first embodiment.

[0072] <Third Implementation Method>

[0073] like Figure 8 and Figure 9 As shown, in the motor 300 of this embodiment, the inner insulating portion 352 of the insulating member 350 has a third protrusion 355 protruding axially. The third protrusion 355 is provided on the inner wall portion 352p. In this embodiment, the third protrusion 355 protrudes upward from the surface above the first inner protrusion 352a. Figure 9 As shown, the third protrusion 355 is provided in the inner wall portion 352p, located on the circumferential side closer to the center of the inner wall portion 352p. In this embodiment, the third protrusion 355 is provided at the circumferential end of the upper surface of the first inner protrusion 352a. The third protrusion 355 is generally rectangular when viewed along the axial direction. The upper surface of the third protrusion 355 is orthogonal to the axial direction.

[0074] It should be noted that, in this embodiment, the circumferential side refers to the side that moves counterclockwise around the central axis J when viewed from above. Figure 9 The following Figure 12 And the following Figure 14 In this diagram, the circumferential direction is represented by an arrow θ. In this embodiment, the circumferential side is the side pointed to by arrow θ (+θ side). The side opposite to the side pointed to by arrow θ (-θ side) is the other circumferential side.

[0075] like Figure 8 and Figure 9 As shown, the inner insulating portion 352 has a first recess 354. In this embodiment, the first recess 354 provided in the inner insulating portion 352 is located in the inner wall portion 352p on the circumferential side closer to the center of the inner wall portion 352p. Here, in order to improve the duty cycle of the coil 32, the circumferential central portion of the inner wall portion 352p is more likely to be thinner in the radial direction compared to the two circumferential ends of the inner wall portion 352p. In other words, the portion of the inner wall portion 352p that is offset circumferentially from the circumferential central portion is more likely to be thickened in the radial direction compared to the circumferential central portion of the inner wall portion 352p. Therefore, by providing the first recess 354 in the portion of the inner wall portion 352p located on the circumferential side closer to the center of the inner wall portion 352p, it is easier to provide the first recess 354 in the portion of the inner wall portion 352p with a larger radial dimension. Therefore, even if the first protrusion 361 is inserted into the first recess 354 and a force is applied from the first protrusion 361 to the inner surface of the first recess 354, the force can be easily borne by the more rigid portion of the inner wall portion 352p. Thus, the busbar holder 360 can be supported more stably by the inner wall portion 352p.

[0076] In this embodiment, a first recess 354 is provided in the portion of the inner wall portion 352p that includes the third protrusion 355. The first recess 354 is a hole recessed downward and having a bottom on the lower side. The first recess 354 opens at the axial end face of the third protrusion 355. In this embodiment, the first recess 354 opens at the upper end face of the third protrusion 355. The first recess 354 is circular when viewed axially. In this embodiment, the radial dimension of the portion of the inner wall portion 352p in which the first recess 354 is provided is larger than the radial dimension of the other portions of the inner wall portion 352p. The portion of the inner wall portion 352p in which the first recess 354 is provided protrudes radially outward than the other portions of the inner wall portion 352p.

[0077] like Figure 8 As shown, the inner surface of the first recess 354 has a circumferential surface 354d surrounding the first protrusion 361 about a virtual axis IL1 extending axially. Therefore, by inserting the first protrusion 361 into the first recess 354, the busbar holder 360 can be positioned radially and circumferentially relative to the inner insulating portion 352. The virtual axis IL1 passes through the center of the circular first recess 354 when viewed axially. In this embodiment, the circumferential surface 354d is a cylindrical surface centered on the virtual axis IL1. The circumferential surface 354d is the inner circumferential surface of the first recess 354.

[0078] like Figure 9As shown, an axially extending groove 356 is provided at the circumferential center of the radially inner surface of the inner wall portion 352p. Therefore, when the insulating part 350 is molded, even if the inner wall portion 352p shrinks or warps, contact between the circumferential center of the inner wall portion 352p and the rotor 20 located radially inner of the stator 30 can be prevented. With the groove 356 provided, the radial dimension of the circumferential center of the inner wall portion 352p becomes smaller. Therefore, in the configuration with the groove 356, the effect of circumferentially offsetting the first recess 354 from the circumferential center of the inner wall portion 352p can be more usefully obtained.

[0079] In this embodiment, the radial dimension of the inner sidewall portion 352p is smallest at the circumferential portion of the inner sidewall portion 352p where the groove 356 is provided. The radial dimension of the portion of the inner sidewall portion 352p adjacent to the circumferential sides of the groove 356 increases as it moves away circumferentially from the groove 356.

[0080] In this embodiment, the winding start end 32b of the wire 32c constituting the coil 32 is located on the opposite side (-θ side) circumferentially from the center of the inner wall portion 352p. That is, the winding start end 32b is located on the side opposite to the first recess 354 in the circumferential direction, separated from the center of the inner wall portion 352p. Therefore, by providing the first recess 354, even if the portion on the circumferential side (+θ side) of the inner wall portion 352p becomes thicker in the radial direction, this thickened portion is less likely to become an obstacle when starting to wind the wire 32c. Therefore, the operator or others can easily wind the wire 32c.

[0081] like Figure 10 As shown, in the busbar assembly 340 of this embodiment, the busbar holder 360 has a first protrusion 361 and a second protrusion 362. The second protrusion 362 protrudes axially. In this embodiment, the second protrusion 362 protrudes downward from the lower surface of the holder body 63. When viewed axially, the second protrusion 362 has a shape formed by cutting off the radially inner edge of a circle centered on a virtual axis IL1 along the radially inner edge of the holder body 63. In a direction orthogonal to the axial direction, the size of the second protrusion 362 is larger than the size of the first protrusion 361. The outer diameter of the second protrusion 362 is larger than the outer diameter of the first protrusion 361.

[0082] like Figure 8As shown, the lower surface of the second protrusion 362 contacts the upper end face of the third protrusion 355. Thus, the second protrusion 362 contacts the inner insulating portion 352 axially. Therefore, the busbar holder 360 can be axially positioned relative to the inner insulating portion 352 via the second protrusion 362. Furthermore, the third protrusion 355 is provided in the inner wall portion 352p at a position closer to the circumferential center (+θ side) than the circumferential center of the inner wall portion 352p. Therefore, the portion of the inner wall portion 352p whose radial dimension is larger than the circumferential central portion can axially support the second protrusion 362. Thus, the inner wall portion 352p can stably bear the load of the busbar holder 360, allowing the busbar holder 360 to be more stably supported on the inner insulating portion 352.

[0083] The first protrusion 361 protrudes axially from the axial end of the second protrusion 362. In this embodiment, the first protrusion 361 protrudes downward from the lower end face of the second protrusion 362. Figure 10 As shown, in this embodiment, the first protrusion 361 is approximately cylindrical about a virtual axis IL1. In the radial direction centered on the virtual axis IL1, the outer surface of the first protrusion 361 is further inward than the outer surface of the second protrusion 362. Figure 8 As shown, at least a portion of the first protrusion 361 is inserted into the first recess 354. In this embodiment, the entire first protrusion 361 is inserted into the first recess 354. The first protrusion 361 fits into the first recess 354. For example, the first protrusion 361 is clearance-fitted into the first recess 354. The outer peripheral surface of the first protrusion 361 may contact the peripheral surface 354d of the first recess 354, or it may be opposed to the peripheral surface 354d with a gap. It should be noted that the first protrusion 361 may also be pressed into the first recess 354.

[0084] In this embodiment, the first protrusion 361 protrudes axially from the axial end of the second protrusion 362. The inner insulating portion 352 has a third protrusion 355 protruding axially. The first recess 354 opens at the axial end face of the third protrusion 355. The second protrusion 362 contacts the axial end face of the third protrusion 355. Therefore, compared to the case where the first protrusion 361 and the second protrusion 362 are fabricated at different locations, it is easier to fabricate the first protrusion 361 and the second protrusion 362. Furthermore, since the first recess 354 opens at the axial end face of the third protrusion 355, the first protrusion 361 can be inserted into the first recess 354, and the second protrusion 362 can contact the periphery of the first recess 354 at the axial end face of the third protrusion 355. Therefore, the first protrusion 361 can be easily inserted into the first recess 354 to position the busbar holder 360 in the circumferential and radial directions, and the second protrusion 362 can be easily contacted with the third protrusion 355 to position the busbar holder 360 in the axial direction. Thus, the busbar holder 360 can be easily positioned relative to the inner insulating portion 352. Furthermore, by providing the third protrusion 355 as the part contacted by the second protrusion 362, the busbar holder 360 can be positioned with high precision in the axial direction via the second protrusion 362, provided the third protrusion 355 is manufactured with high precision. Therefore, for example, compared to manufacturing the entire upper surface of the first inner protrusion 352a with high precision, the manufacturing time of the insulating portion 350 can be reduced. This reduces the manufacturing cost of the motor 300.

[0085] The axial dimension of the first protrusion 361 is smaller than the axial dimension of the first recess 354. The lower end of the first protrusion 361 is positioned upwards and further away than the lower portion of the inner surface of the first recess 354. The other configurations of the busbar assembly 340 are the same as those of the busbar assembly 40 in the first embodiment. The other configurations of the motor 300 are the same as those of the motor 100 in the first embodiment.

[0086] <Fourth Implementation>

[0087] like Figure 11 As shown, in the insulating member 450 of the motor 400 of this embodiment, the inner insulating member portion 452 has a first protrusion 454 and a second protrusion 455. The second protrusion 455 is provided on the inner wall portion 452p. In this embodiment, the second protrusion 455 protrudes upward from the surface above the first inner protrusion 352a. Figure 12 As shown, the second protrusion 455 is provided in the inner sidewall portion 452p, located on the circumferential side (+θ side) closer to the circumferential center of the inner sidewall portion 452p. In this embodiment, the second protrusion 455 is provided at the circumferential end of the upper surface of the first inner protrusion 352a. The upper surface of the second protrusion 455 is orthogonal to the axial direction.

[0088] The first protrusion 454 protrudes axially from the axial end of the second protrusion 455. In this embodiment, the first protrusion 454 protrudes upward from the radially outer end of the upper end face of the second protrusion 455. The first protrusion 454 is generally cylindrical.

[0089] like Figure 13 As shown, the busbar retainer 460 in the busbar assembly 440 has a third protrusion 464 projecting axially. The third protrusion 464 protrudes downward from the lower surface of the retainer body 63. The third protrusion 464 is generally circular when viewed axially. A first recess 465 is provided in the third protrusion 464, recessed upward from the lower surface of the third protrusion 464. That is, in this embodiment, the first recess 465 opens at the lower end face of the third protrusion 464. The first recess 465 is a hole recessed upward and having a bottom on the upper side. The first recess 465 is circular when viewed axially. Figure 11 As shown, the inner surface of the first recess 465 has a circumferential surface 465d surrounding the first protrusion 454 about a virtual axis IL2 extending axially. Therefore, by inserting the first protrusion 454 into the first recess 465, the busbar holder 460 can be positioned radially and circumferentially relative to the inner insulating portion 452. The virtual axis IL2 passes through the center of the circular first recess 465 when viewed axially. In this embodiment, the circumferential surface 465d is a cylindrical surface centered on the virtual axis IL2. The circumferential surface 465d is the inner circumferential surface of the first recess 465.

[0090] At least a portion of the first protrusion 454 is inserted into the first recess 465. In this embodiment, the entire first protrusion 454 is inserted into the first recess 465. The first protrusion 454 fits within the first recess 465. For example, the first protrusion 454 is clearance-fitted within the first recess 465. The outer peripheral surface of the first protrusion 454 may contact the peripheral surface 465d of the first recess 465, or it may be opposed to the peripheral surface 465d with a gap. It should be noted that the first protrusion 454 may also be pressed into the first recess 465.

[0091] The axial dimension of the first protrusion 454 is smaller than the axial dimension of the first recess 465. The upper end of the first protrusion 454 is positioned further downward than the upper portion of the inner surface of the first recess 465. The lower end face of the third protrusion 464, on which the first recess 465 is located, contacts the upper end face of the second protrusion 455. Thus, the second protrusion 455 contacts the busbar holder 460 on which the first recess 465 is located in the axial direction.

[0092] The other configurations of the busbar assembly 440 are the same as those of the busbar assembly 40 in the first embodiment. The other configurations of the motor 400 are the same as those of the motor 100 in the first embodiment.

[0093] According to this embodiment, the inner insulating portion 452 has a first protrusion 454, and the busbar holder 460 has a first recess 465. Therefore, compared to the case where the first recess 465 is provided in the inner insulating portion 452, the formation of thin-walled portions in the inner insulating portion 452 can be suppressed. This makes it easier to ensure the strength of the inner insulating portion 452 and to properly support the busbar assembly 440 through the inner insulating portion 452. Furthermore, since the formation of thin-walled portions in the inner insulating portion 452 can be suppressed, the resin's inability to flow within the mold can be prevented when molding the insulating part 450 using a mold. This improves the yield of the insulating part 450.

[0094] <Fifth Implementation>

[0095] like Figure 14 As shown, in the stator 530 of the motor 500 of this embodiment, a first recess 554 provided in the inner insulating portion 552 of the insulating member 550 spans across adjacent inner wall portions 552p in the circumferential direction. Therefore, the load of the busbar holder 560 borne by the first protrusion 561 in the first recess 554 can be distributed through the two inner wall portions 552p. As a result, the busbar holder 560 can be supported more stably.

[0096] The first recess 554 is recessed downward and radially extends through the adjacent inner wall portion 552p in the circumferential direction. The first recess 554 has a first portion 554a and a second portion 554b. The first portion 554a is disposed in the inner wall portion 552p located on one circumferential side (+θ side) of the adjacent inner wall portion 552p in the circumferential direction. The second portion 554b is disposed in the inner wall portion 552p located on the other circumferential side (-θ side) of the adjacent inner wall portion 552p in the circumferential direction. The first portion 554a is disposed at the end of the first inner protrusion 552a on the other circumferential side of the inner wall portion 552p located on one circumferential side, and radially extends through the first inner protrusion 552a. The second portion 554b is disposed at the end of the first inner protrusion 552a on one circumferential side of the inner wall portion 552p located on the other circumferential side, and radially extends through the first inner protrusion 552a.

[0097] Similar to the first protrusion 261 and the second protrusion 262 in the second embodiment, the first protrusion 561 and the second protrusion 562 of the busbar holder 560 provided in the busbar assembly 540 protrude downward from the lower side of the holder body 63. The first protrusion 561 has a first portion 561a and a second portion 561b. The first portion 561a is located on the circumferential side (+θ side) of the second portion 561b and is connected to the second portion 561b. The first portion 561a is inserted from above into the first portion 554a of the first recess 554. The second portion 561b is inserted from above into the second portion 554b of the first recess 554. The first portion 561a of the first protrusion 561 contacts the lower side of the first portion 554a of the first recess 554 from above. The second portion 561b of the first protrusion 561 contacts the lower side of the second portion 554b of the first recess 554 from above.

[0098] The second protrusion 262 has a first portion 562a and a second portion 562b. The first portion 562a contacts the inner wall portion 552p located on one circumferential side (+θ side) from the radially outer side. The second portion 562b contacts the inner wall portion 552p located on the other circumferential side (-θ side) from the radially outer side. The other configurations of the busbar assembly 540 are the same as those of the busbar assembly 240 in the second embodiment. The other configurations of the motor 500 are the same as those of the motor 200 in the second embodiment.

[0099] This invention is not limited to the embodiments described above. Other configurations and methods can be employed within the scope of the technical concept of this invention. The shape of the first recess is not particularly limited. The first protrusion can be of any shape as long as at least a portion is inserted into the first recess. The direction of the first recess is not particularly limited. The first recess can also be a recess that is recessed in a direction other than the axial direction. The direction of the first protrusion is not particularly limited. In each of the first, second, and fifth embodiments described above, the first and second protrusions may be provided in the inner insulating member portion, and the first recess may be provided in the busbar holding member. The number of first protrusions and the number of first recesses are each only one or more, and are not particularly limited. The number of second protrusions is only one or more, and is not particularly limited. Alternatively, the second protrusion may not be provided.

[0100] As long as the busbar holder is supported axially by the inner insulating portion, any part of it can contact the inner insulating portion. For example, in the second embodiment described above, the first protrusion 261 may not contact the bottom surface 54c, but rather the lower surface of the holder body 263 may contact the upper end face of the first inner protrusion 52a, thereby ensuring that the busbar holder 260 is supported axially by the inner insulating portion 52. The application of the motor in the above embodiments is not particularly limited.

[0101] It should be noted that this technology can be configured as described below.

[0102] (1) A motor comprising: a rotor rotatable about a central axis; a stator located radially outward of the rotor; and a busbar assembly located axially on one side of the stator, the stator having: a stator core; an insulator mounted on the stator core; and a coil mounted on the stator core through the insulator, the insulator having an inner insulator portion located radially inward of the coil; the busbar assembly having: a busbar; and a busbar retainer retaining the busbar, the busbar retainer having a surrounding portion The busbar has an annular retainer body portion along its central axis. The busbar has a coil connection portion that connects to a coil lead wire extending from the coil. The coil connection portion protrudes radially outward from the retainer body portion. A portion of one of the inner insulating portion and the busbar retainer has a first recess, and a portion of the other of the inner insulating portion and the busbar retainer has a first protrusion. At least a portion of the first protrusion is inserted into the first recess, and the busbar retainer is axially supported by the inner insulating portion.

[0103] (2) The motor according to (1), wherein the inner insulating part has the first recess, the busbar retainer has the first protrusion, the first recess is recessed to the other side of the axial direction, and the first protrusion contacts the portion of the inner surface of the first recess located on the other side of the axial direction.

[0104] (3) The motor according to (2), wherein the inner surface of the first recess has a pair of side surfaces that sandwich the first protrusion in the circumferential direction.

[0105] (4) The motor according to (2) or (3), wherein the retainer body portion is located radially outward of the inner insulating portion, the first recess opens radially outward, and the first protrusion protrudes radially inward from the retainer body portion.

[0106] (5) The motor according to any one of (2) to (4), wherein the stator core has: an annular core back surrounding the central axis; and a plurality of teeth extending radially inward from the core back and arranged circumferentially spaced apart, the insulator having a plurality of insulator segments respectively mounted on the plurality of teeth, the plurality of insulator segments each having an inner sidewall located radially inward than the coil, the inner sidewall having each of the plurality of insulator segments, the first recess spanning the circumferentially adjacent inner sidewalls.

[0107] (6) The motor according to (1), wherein the inner insulating portion has the first protrusion and the busbar retainer has the first recess.

[0108] (7) The motor according to (1) or (6), wherein the inner surface of the first recess has a circumferential surface surrounding the first protrusion about a virtual axis extending along the axial direction.

[0109] (8) The motor according to any one of (1) to (4), (6), and (7), wherein the stator core has: an annular core back surrounding the central axis; and a plurality of teeth extending radially inward from the core back and arranged at intervals in the circumferential direction, the insulating member having a plurality of insulating member segments respectively mounted on the plurality of teeth, the plurality of insulating member segments each having an inner sidewall portion located radially inward from the coil, the inner sidewall portion having each of the plurality of insulating member segments' inner sidewall portions, and portions of the first recess and the first protrusion disposed in the inner sidewall portion being disposed in portions of the inner sidewall portion located circumferentially closer to the circumferential center of the inner sidewall portion.

[0110] (9) The motor according to (8), wherein the coil is formed by winding a wire around the tooth through the insulating slab portion, and the end of the wire constituting the coil at the beginning of winding is located on the other side of the circumference than the circumferential center of the inner wall portion.

[0111] (10) The motor according to (8) or (9) wherein a groove extending axially is provided at the circumferential center of the radially inner side surface of the inner wall portion.

[0112] (11) The motor according to any one of (1) to (10), wherein the portion of the other party has a second protrusion projecting axially, the second protrusion contacting the portion of the other party in the radial direction.

[0113] (12) The motor according to (11), wherein the circumferential dimension of the second protrusion is greater than the circumferential dimension of the first protrusion.

[0114] (13) The motor according to (11) or (12), wherein the second protrusion protrudes from the retainer body portion toward the other side in the axial direction and contacts the inner insulating portion from the radially outer side, and the radially outer side of the second protrusion has an inclined portion that is located radially inner as it moves toward the other side in the axial direction.

[0115] (14) The motor according to any one of (1) to (10), wherein the portion of the other party has a second protrusion projecting axially, the second protrusion contacting the portion of the other party in the radial direction.

[0116] (15) The motor according to (14), wherein, in a direction orthogonal to the axial direction, the size of the second protrusion is larger than the size of the first protrusion, the first protrusion protrudes axially from the axial end of the second protrusion, a portion of the first protrusion having a third protrusion protruding axially, the first recess opening at the axial end face of the third protrusion, and the second protrusion contacting the axial end face of the third protrusion.

[0117] (16) The motor according to any one of (1) to (15), wherein the retainer body portion is axially opposed to the coil, and a second recess is provided in the portion of the retainer body portion facing the coil on the other axial side.

[0118] The structures and methods described above can be appropriately combined within the scope of mutual non-contradiction.

[0119] Explanation of reference numerals in the attached figures

[0120] 20: Rotor; 30, 530: Stator; 31: Stator core; 31a: Core back; 31b: Tooth; 32: Coil; 32a: Coil lead; 32c: Conductor; 40, 240, 340, 440, 540: Busbar assembly; 50, 350, 450, 550: Insulator; 50p: Insulator segment; 52, 352, 452, 552: Inner insulation portion; 52p, 352p, 452p, 552p: Inner wall portion; 54, 354, 465, 554: First recess; 54a, 54b: A pair of side surfaces; 60, 2 60, 360, 460, 560: Busbar retainer; 61, 261, 361, 454, 561: First protrusion; 62, 262, 362, 455, 562: Second protrusion; 62a, 262a: Inclined portion; 63, 263: Main body of retainer; 63a: Second recess; 70: Busbar; 72: Coil connection portion; 100, 200, 300, 400, 500: Motor; 354d, 465d: Circumferential surface; 355, 464: Third protrusion; 356: Groove; IL1, IL2: Virtual axis; J: Central axis.

Claims

1. A motor, said motor comprising: The rotor can rotate around its central axis. The stator is located radially outside the rotor; and The busbar assembly is located on one axial side of the stator. The stator has: Stator core; Insulating components are installed on the stator core; and The coil is mounted on the stator core through the insulating element. The insulating member has an inner insulating member portion located radially inward than the coil. The busbar assembly has: Busbar; and Busbar retainer, holding the busbar in place. The busbar retainer has an annular retainer body portion surrounding the central axis. The busbar has a coil connection portion that connects to the coil lead wires extending from the coil. The coil connection portion protrudes radially outward from the main body of the retainer. A portion of either the inner insulating part or the busbar retainer has a first recess. The portion of the inner insulating part and the portion of the busbar retainer have a first protrusion. At least a portion of the first protrusion is inserted into the first recess. The busbar retainer is axially supported by the inner insulating portion.

2. The motor according to claim 1, wherein, The inner insulating part has the first recess. The busbar retainer has the first protrusion. The first recess is recessed to the other side axially. The first protrusion contacts the portion of the inner surface of the first recess located on the other side of the axial direction.

3. The motor according to claim 2, wherein, The inner surface of the first recess has a pair of side surfaces that sandwich the first protrusion in the circumferential direction.

4. The motor according to claim 2, wherein, The main body of the retainer is located radially outside the inner insulating part. The first recess opens radially outward. The first protrusion protrudes radially inward from the main body of the retainer.

5. The motor according to claim 2, wherein, The stator core has: A ring-shaped core back surrounds the central axis; and Multiple teeth, extending radially inward from the core, are arranged at intervals in the circumferential direction. The insulating element has multiple insulating element segments respectively mounted on the multiple teeth. The plurality of insulating segments each have an inner wall portion located radially inward from the coil. The inner insulating part has each of the inner wall portions among the plurality of insulating part segments. The first recess spans across the inner wall portions that are adjacent to each other in the circumferential direction.

6. The motor according to claim 1, wherein, The inner insulating part has the first protrusion. The busbar retainer has the first recess.

7. The motor according to claim 1, wherein, The inner surface of the first recess has a circumferential surface surrounding the first protrusion about a virtual axis extending axially.

8. The motor according to claim 1, wherein, The stator core has: A ring-shaped core back surrounds the central axis; and Multiple teeth, extending radially inward from the core, are arranged at intervals in the circumferential direction. The insulating element has multiple insulating element segments respectively mounted on the multiple teeth. The plurality of insulating segments each have an inner wall portion located radially inward from the coil. The inner insulating part has each of the inner wall portions among the plurality of insulating part segments. The portion of the first recess and the first protrusion located in the inner insulating portion is located in the inner wall portion on the side closer to the circumferential center of the inner wall portion.

9. The motor according to claim 8, wherein, The coil is constructed by winding a wire around the teeth through the insulating segments. The end of the wire constituting the coil where the winding begins is located on the other side of the circumference, relative to the circumferential center of the inner wall portion.

10. The motor according to claim 8, wherein, A groove extending axially is provided at the circumferential center of the radially inner side surface of the inner wall portion.

11. The motor according to any one of claims 1 to 10, wherein, The other part has a second protrusion that projects along the axial direction. The second protrusion contacts a portion of the first part in the radial direction.

12. The motor according to claim 11, wherein, The circumferential dimension of the second protrusion is greater than that of the first protrusion.

13. The motor according to claim 11, wherein, The second protrusion protrudes axially from the main body of the retainer and contacts the inner insulating part from the radially outer side. The radially outer surface of the second protrusion has an inclined portion that is located radially inner as it moves toward the other side of the axial direction.

14. The motor according to any one of claims 1 to 10, wherein, The other part has a second protrusion that projects along the axial direction. The second protrusion contacts one of the portions in the axial direction.

15. The motor according to claim 14, wherein, In a direction orthogonal to the axial direction, the size of the second protrusion is larger than the size of the first protrusion. The first protrusion protrudes axially from the axial end of the second protrusion. One of the portions has a third protrusion projecting axially. The first recess opens at the axial end face of the third protrusion. The second protrusion contacts the axial end face of the third protrusion.

16. The motor according to any one of claims 1 to 10, wherein, The main body of the retainer is axially opposed to the coil. A second recess is provided on the portion of the surface on the other side of the axial direction of the main body of the retainer, which is axially opposite to the coil.

Images