Stator

Abstract

The stator includes a plurality of insulators (71, 71A, 71B) and a plurality of coils (81). Each of the insulators has a plurality of holding grooves (74, 74a-74l) and a plurality of restricting protrusions (75, 75a-75f, 75A). Each of the restricting protrusions has a contact surface (75X) that comes into contact with an end portion of the coil in the first direction in an odd number of three or more layers of the coil. The contact surface is inclined such that an end portion (75Xa) that is closer to the pole teeth, of both ends of the contact surface in a direction (D3) that is orthogonal to the first direction (D1) and the reference axis (L1), is farther from the coil in the first direction than an end portion (75Xb) that is farther from the pole teeth.

Description

Citation of related applications

[0001] This application is based on Japanese Patent Application No. 2022-081789 filed on May 18, 2022, and the contents thereof are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to a stator. Background Art

[0003] In the past, among the stators included in the electric motor, there is a stator including a stator core having a plurality of pole teeth and a coil wound on the pole teeth. The coil is formed, for example, by winding a conductive wire on the pole teeth in a manner such that a plurality of layers are formed via an insulator mounted on the stator core. The insulator is specially designed for each diameter, for example, according to the diameter of the conductive wire constituting the coil, so as to maintain the portion of the conductive wire constituting the first layer of the coil at a constant interval along the direction from the front end of the pole tooth toward the base end. For example, the insulator described in Patent Document 1 has a guide groove for guiding the portion of the conductive wire constituting the first layer of the coil. The guide grooves are arranged in parallel at a pitch substantially equal to the diameter of the conductive wire. In addition, the inner circumferential surface of the guide groove is formed into an arc shape corresponding to the outer circumferential surface of the conductive wire. Prior art literature Patent Literature

[0004] Patent Document 1: Japanese Patent No. 6065436 Summary of the invention

[0005] In the stator described in Patent Document 1, the portion of the first layer of the conductive wire constituting the coil is arranged in the guide groove, so that the position of the conductive wire in the first layer becomes stable in the direction from the front end of the pole tooth toward the base end. Moreover, even in the second layer and after the coil, since the conductive wire is guided by the conductive wire of the previous layer whose position is stable, the position in the direction from the front end of the pole tooth toward the base end is easily stabilized. That is, the coil is not easily collapsed.

[0006] However, if the insulator is designed specifically for each diameter of the wire constituting the coil, even if the shape of the stator core is the same but the diameter of the wire constituting the coil is different, the insulator of a different shape will be designed according to the diameter of the wire. Therefore, there is a problem that the types of insulators increase. If there are many types of insulators, the cost required for the mold for molding the insulator may increase, or the cost required for parts management may increase.

[0007] An object of the present disclosure is to provide a stator capable of suppressing coil collapse even if the diameter of a conducting wire constituting a coil is changed, and capable of reducing the types of insulators. Technical solutions adopted to solve technical problems

[0008] In a first embodiment of the present disclosure, the stator includes: a stator core, the stator core having an annular portion and a plurality of pole teeth, the annular portion having a first surface extending along a reference axis and being in an annular shape centered on the reference axis, the plurality of pole teeth extending from the first surface in a direction perpendicular to the reference axis; a plurality of insulators, the plurality of insulators being respectively mounted on the pole teeth; and a plurality of coils, the plurality of coils being wound in a manner such that a conductive wire is wound on the pole teeth through the insulators to form a plurality of layers of three or more, the insulators respectively including: a first adjacent wall, the first adjacent wall covering at least a portion of the first surface at a position offset from the coil in a first direction from the front end toward the base end, and adjacent to the coil in the first direction; a second adjacent wall, the second adjacent wall adjacent to the coil in the second direction at a position offset from the coil in a second direction from the base end toward the front end; and a plurality of retaining grooves for winding the coil relative to the pole teeth along the coil. The wire extending in the direction of the first layer constituting the coil is partially arranged; and a plurality of limiting protrusions, the plurality of limiting protrusions protrude from at least one direction of the first adjacent wall and the second adjacent wall in a direction approaching the coil, the holding grooves are arranged at equal intervals in the first direction, each of the holding grooves has a pair of holding surfaces at both ends in the first direction, the pair of holding surfaces are respectively inclined relative to the first direction in a manner that the closer to the opening portion along the direction from the bottom of the holding groove to the opening portion, the wider the interval in the first direction becomes, the pair of holding surfaces are respectively in contact with the outer peripheral surface of the wire arranged in the holding groove, the limiting protrusions respectively have abutment surfaces abutting against the ends in the first direction in the odd-numbered layers of the coil of more than 3, and the abutment surfaces are inclined in a manner that the ends of the abutment surfaces in the direction orthogonal to the first direction are farther from the pole teeth than the ends closer to the pole teeth in the first direction when viewed from the direction along the reference axis.

[0009] According to this structure, the pair of holding surfaces of each of the holding grooves are inclined relative to the first direction in such a manner that the distance in the first direction becomes wider as the distance from the bottom of the holding groove toward the opening approaches the opening. Therefore, even if the diameter of the wire changes, as long as the wire and the pair of holding surfaces can be arranged in contact with each other, the holding groove can be used to position the portion of the wire constituting the first layer of the coil in the first direction.

[0010] In addition, the portion of the conductor constituting the first layer of the coil is arranged in the retaining grooves arranged at equal intervals in the first direction, and is wound around the pole teeth at a constant interval in the first direction. Moreover, the portion of the conductor constituting the second layer of the coil can be wound around the pole teeth in a manner of being embedded in the groove-shaped portion of the first layer of the coil formed by the outer peripheral surface of the conductor adjacent to each other in the first direction. Therefore, the portion of the conductor constituting the second layer of the coil is wound around the pole teeth at a constant interval in the first direction. Similarly, the portion of the conductor constituting the third layer and later of the coil is also positioned in the first direction by utilizing the portion of the conductor constituting the layer just wound, and is wound around the pole teeth at a constant interval in the first direction.

[0011] Generally speaking, when the number of turns of the coil is the same, the larger the diameter of the wire, the second layer of the coil is arranged at a position farther from the outer peripheral surface of the pole tooth when viewed from the first direction. In addition, generally speaking, when the number of turns of the coil is the same, the larger the diameter of the wire, the longer the distance between the two ends of each layer of the coil in the first direction and the center of the coil in the first direction becomes. Moreover, when viewed from the direction along the reference axis, the abutment surface of each limiting protrusion is inclined in a manner that the end of the abutment surface in the direction orthogonal to the first direction is farther away from the coil than the end close to the pole tooth. That is, when viewed from the direction along the reference axis, the abutment surface is inclined in a manner that the distance between the abutment surface and the center of the coil in the first direction becomes longer as it is farther away from the pole tooth in the direction orthogonal to the first direction. Therefore, even if the diameter of the wire changes, the coil can be wound around the pole tooth with the same number of turns without changing the insulator. In addition, even if the diameter of the wire changes, each abutment surface of the limiting protrusion can abut the end of the part of the wire that constitutes the coil in the first direction of 3 or more odd layers.

[0012] In addition, for example, when using a conventional insulator that does not include a limiting protrusion, a gap is sometimes formed between the end of the odd-numbered layers of the coil and the insulator in the first direction, depending on the diameter of the wire. In contrast, since the insulator of the above-mentioned structure has a limiting protrusion, it is possible to suppress the formation of a gap between the end of the odd-numbered layers of the coil and the insulator in the first direction. Moreover, by abutting the end of the portion of the wire that has more than 3 odd-numbered layers constituting the coil with the abutting surface in the first direction, the end can be suppressed from moving away from the center of the coil in the first direction. That is, even if the diameter of the wire changes, the coil collapse can be suppressed.

[0013] Thus, even if the diameter of the wire constituting the coil changes, the portion of the first layer of the wire constituting the coil can be wound at a constant interval in the first direction. Furthermore, even if the diameter of the wire constituting the coil changes, the coil collapse after the third layer can be suppressed by the limiting protrusion having the abutment surface. Therefore, even if the diameter of the wire changes, the design of the insulator does not need to be changed. Therefore, even if the diameter of the wire constituting the coil changes, the coil collapse can be suppressed, and the types of insulators can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above objects and other objects, features and advantages of the present disclosure will become more apparent with reference to the accompanying drawings and the following detailed description. Figure 1 It is a schematic diagram of an electric motor having a stator in one embodiment. Figure 2 yes Figure 1 A perspective view of a stator including a split core and an insulator is shown. Figure 3 yes Figure 1 A perspective view of the insulator included in the stator is shown. Figure 4 yes Figure 1 A perspective view of the insulator included in the stator is shown. Figure 5 yes Figure 1 A top view of the insulator included in the stator is shown. Figure 6 It is shown Figure 1 A top view of a portion of an insulator included in the stator is shown. Figure 7 yes Figure 1 The stator shown is a top view of a split core with coils wound around it. Figure 8 It is shown Figure 1 The stator shown is a top view of a portion of a split core having a coil wound therearound. Fig. 9 It is shown Figure 1 The stator shown is a top view of a portion of a split core having a coil wound therearound. Fig.10 It is shown Figure 1 The stator shown is a top view of a portion of a split core having a coil wound therearound. Fig.11 It is shown Figure 1 The stator shown is a top view of a portion of a split core having a coil wound therearound. Fig.12 It is a plan view showing a part of a stator in a modified example. Fig.13 It is a plan view showing a part of a stator in a modified example. DETAILED DESCRIPTION

[0015] Hereinafter, an embodiment of the stator will be described. In each of the drawings, for the sake of convenience of explanation, there is a case where a part of the structure is exaggerated or simplified. In addition, there is a case where the size ratio of each part is different in each drawing. "Orthogonal" in this specification includes not only the case of strict orthogonality, but also the case of approximately orthogonality within the scope of achieving the effect of the present embodiment. In addition, the term "annular" used in this specification sometimes refers to any structure that forms an annular shape, that is, a continuous shape without an end, and a structure that is annular in shape as a whole with a gap such as a C-shaped shape. The "annular" shape includes a circle, an ellipse, and a polygon with a sharp corner or a rounded corner, but is not limited to this. In addition, the expression "at least one" used in this specification means "more than one" of the desired options. As an example, the expression "at least one" used in this specification means "only one option" or "both of the two options" if the number of options is two. As another example, the expression "at least one" used in this specification means "only one option" or "a combination of any two or more options" if the number of options is three or more. In addition, the present disclosure is not limited to these examples, but is shown in the form of claims, and is intended to include all changes within the meaning equivalent to the claims and the scope thereof.

[0016] (Overall Structure of Motor 50) like Figure 1 As shown, the motor 50 includes a stator 51 and a rotor 52. The stator 51 is annular. The rotor 52 is disposed, for example, inside the stator 51. The rotor 52 includes a rotating shaft 53.

[0017] (Structure of stator 51) The stator 51 includes a stator core 61 , an insulator 71 , and a plurality of coils 81 .

[0018] (Structure of stator core 61) like Figure 1 and Figure 2 As shown, the stator core 61 has, for example, a plurality of split cores 62 arranged in the circumferential direction of the stator 51. The stator core 61 has, for example, 12 split cores 62. Each split core 62 is made of a magnetic metal material. Each split core 62 includes a back yoke portion 64 having a first surface 63 and a pole tooth 65 protruding from the first surface 63 in a direction orthogonal to the reference axis L1. The reference axis L1 coincides with the rotation center of the rotating shaft 53 in the motor 50. In addition, the reference axis L1 coincides with the central axis of the stator core 61 in the stator core 61. In addition, the direction along the reference axis L1 is set as the axial direction A1.

[0019] The plurality of split core portions 62 constituting the stator core portion 61 are arranged in an annular shape with the reference axis L1 as the center. In addition, the plurality of split core portions 62 are arranged in the circumferential direction C1 around the reference axis L1 in such a manner that the back yoke portion 64 of each split core portion 62 is in an annular shape as a whole. In addition, the circumferential direction C1 is the same direction as the circumferential direction of the stator 51. The back yoke portions 64 of the 12 split core portions 62 constitute an annular portion 66 in an annular shape with the reference axis L1 as the center. The first surface 63 of each back yoke portion 64, for example, constitutes the inner circumferential surface of the annular portion 66. That is, the annular portion 66 has a first surface 63. The first surface 63 extends along the reference axis L1.

[0020] In a state where a plurality of split core portions 62 are arranged along the circumferential direction C1, the first surface 63 is a radially inner side surface of the back yoke portion 64. In addition, the "radial direction" is a direction orthogonal to the reference axis L1. In addition, the radial direction is a direction orthogonal to the circumferential direction C1. In this state, each pole tooth 65 protrudes radially inward from each back yoke portion 64. In addition, in this state, each pole tooth 65 extends in the radial direction. In addition, in this state, the front end of each pole tooth 65 is the end portion of each pole tooth 65 on the inner side in the radial direction. Moreover, in this state, the base end of each pole tooth 65 is the end portion of each pole tooth 65 on the outer side in the radial direction. Each pole tooth 65 may also have a circumferential protrusion 67 protruding from the front end area of ​​each pole tooth 65 to both sides of the circumferential direction C1.

[0021] (Structure of Insulator 71 and Coil 81) An insulator 71 is mounted on each pole tooth 65. A coil 81 is wound around each pole tooth 65 via the insulator 71. Each coil 81 is formed by winding a conductive wire 91 on the pole tooth 65 in a plurality of layers of three or more via the insulator 71. Incidentally, each coil 81 is formed by one conductive wire 91. In addition, two or more coils 81 among the plurality of coils 81 may be continuously formed by the same one conductive wire 91. For example, each coil 81 is formed by winding five layers of conductive wire 91 on the pole tooth 65 via the insulator 71. In addition, the number of layers of each coil 81 is not limited to five as long as it is three or more. The cross-sectional shape of the conductive wire 91 is, for example, circular. The conductive wire 91 is, for example, an insulated wire.

[0022] The insulator 71 is used to electrically insulate the coil 81 wound around the pole teeth 65 from the stator 51. Each insulator 71 is made of an insulating resin material. Each insulator 71 is, for example, a resin molded product formed using a mold. For example, two insulators 71 are installed on each split core portion 62 from both sides in the axial direction A1. The two insulators 71 installed on each split core portion 62 are formed into the same shape, for example.

[0023] like Figure 2 to Figure 5As shown, each insulator 71 has first adjacent walls 72a, 72b, second adjacent walls 73a, 73b, a plurality of retaining grooves 74, and a plurality of limiting protrusions 75. In addition, each of the insulators 71 has, for example, a pole tooth covering portion 76 that covers at least a portion of the outer peripheral surface of the pole tooth 65. In addition, each of the insulators 71 may also have a yoke end surface covering portion 77 that covers a portion of the end surface of the annular portion 66 in the axial direction A1. The yoke end surface covering portion 77 covers at least a portion of the end surface of the back yoke portion 64 in the axial direction A1. Each insulator 71 is, for example, a single component formed integrally by connecting the first adjacent walls 72a, 72b, the second adjacent walls 73a, 73b, the limiting protrusions 75, the pole tooth covering portion 76, and the yoke end surface covering portion 77.

[0024] In each insulator 71, the pole tooth covering portion 76 includes an end surface covering portion 76a that covers one of the two end surfaces of the pole tooth 65 in the axial direction A1, and side surface covering portions 76b and 76c that cover the two side surfaces in the circumferential direction C1 of the pole tooth 65. The side surface covering portions 76b and 76c extend from both ends of the end surface covering portion 76a in the circumferential direction C1 along the axial direction A1.

[0025] In each insulator 71, a plurality of retaining grooves 74 are provided in the pole tooth covering portion 76. For example, the insulator 71 has six retaining grooves 74 extending across the side covering portion 76b and the end surface covering portion 76a, and six retaining grooves 74 extending across the side covering portion 76c and the end surface covering portion 76a. The six retaining grooves 74 extending across the side covering portion 76b and the end surface covering portion 76a are referred to as retaining grooves 74a to 74f. The six retaining grooves 74 extending across the side covering portion 76c and the end surface covering portion 76a are referred to as retaining grooves 74g to 74l.

[0026] The retaining grooves 74a to 74f are arranged in a row along the first direction D1 from the front end toward the base end of the pole tooth 65. In addition, the retaining grooves 74a to 74f are arranged at equal intervals in the first direction D1. Similarly, the retaining grooves 74g to 74l are arranged in a row along the first direction D1. In addition, the retaining grooves 74g to 74l are arranged at equal intervals in the first direction D1. In addition, the direction from the base end toward the front end of the pole tooth 65 is the second direction D2.

[0027] Each of the retaining grooves 74a to 74f extends within a range including an end region of the end of the end surface covering portion 76a in the circumferential direction C1 close to the end of the side covering portion 76b and an end region of the side covering portion 76b in the axial direction A1 continuous with the end region. That is, the retaining grooves 74a to 74f are provided in a region of the pole tooth covering portion 76 including a corner formed by the end surface covering portion 76a and the side covering portion 76b.

[0028] The retaining grooves 74g to 74l extend in a range including an end region of the end of the end surface covering portion 76a in the circumferential direction C1 close to the end of the side covering portion 76c and an end region of the side covering portion 76c in the axial direction A1 continuous with the end region. That is, the retaining grooves 74g to 74l are provided in a region of the pole tooth covering portion 76 including a corner formed by the end surface covering portion 76a and the side covering portion 76c.

[0029] Each retaining groove 74 extends along the winding direction C2 of the coil 81 with respect to the pole teeth 65. The winding direction C2 is the direction in which the conductive wire 91 constituting the coil 81 is wound with respect to the pole teeth 65. The portions of the retaining grooves 74 provided in the side cover portions 76b and 76c extend along the axial direction A1. When viewed from the axial direction A1, the portions of the retaining grooves 74 provided in the end surface cover portion 76a extend along the direction orthogonal to the first direction D1 and the reference axis L1.

[0030] like Figure 5 and Figure 6 As shown, each retaining groove 74 has a pair of retaining surfaces 78a and 78b at both ends of the retaining groove 74 in the first direction D1. In each retaining groove 74, the retaining surface 78b is located at a position that is more offset in the first direction D1 than the retaining surface 78a. The paired retaining surfaces 78a and the retaining surfaces 78b are inclined relative to the first direction D1 in such a manner that the closer they are to the opening 78d along the direction from the bottom 78c of the retaining groove 74, the wider the intervals between them in the first direction D1 become. Therefore, each retaining surface 78a and 78b is not a surface perpendicular to the first direction D1. In addition, each retaining surface 78a and 78b is not a surface parallel to the first direction D1.

[0031] Each retaining groove 74 is, for example, V-shaped in cross section. That is, each of the retaining grooves 74 is formed in a V-shape, for example, in such a way that the width in the first direction D1 becomes wider as the direction from the bottom 78c of the retaining groove 74 toward the opening 78d approaches the opening 78d. Incidentally, the cross section of the retaining groove 74 is a cross section perpendicular to the extension direction of the retaining groove 74. In addition, the shape of the retaining groove 74 in the cross section is not limited to the V-shape, and may be, for example, a trapezoidal shape. In addition, the shape of the bottom 78c of the retaining groove 74 may be, for example, an arc shape, a plane extending along the first direction D1, or any other shape.

[0032] The pole tooth covering portion 76 has a protrusion 79, for example, between the retaining grooves 74 adjacent in the first direction D1. The protrusion 79 is a portion between the retaining surfaces 78a and the retaining surfaces 78b adjacent in the first direction D1 in the retaining grooves 74 adjacent in the first direction D1. For example, the protrusion 79 between the retaining grooves 74a and the retaining grooves 74b is a portion between the retaining surface 78b of the retaining groove 74a and the retaining surface 78a of the retaining groove 74b. The front end of each protrusion 79 may also have a rounded corner. For example, the front end surface of each protrusion 79 is curved into an arc shape that protrudes in the protruding direction of each protrusion 79. In addition, the protruding direction of each protrusion 79 is the same direction as the direction from the bottom 78c of the retaining groove 74 toward the opening 78d.

[0033] like Figure 7 As shown, each coil 81 has a first end line 82 and a second end line 83. In each coil 81, the first end line 82 is an end region including an end where winding starts in the conductive wire 91 constituting the coil 81. In each coil 81, the second end line 83 is an end region including an end where winding ends in the conductive wire 91 constituting the coil 81.

[0034] Figure 7 to Figure 11 The coil 81 shown is shown in a cross section perpendicular to the reference axis L1, that is, a cross section perpendicular to the axial direction A1. Figure 1 In the figure, Figure 7 to Figure 11 Not shown in the figure. Figure 7 to Figure 11 In the diagram, the axis A1 is the direction perpendicular to the paper. Figure 7 to Figure 11 In FIG. 8 , the shadow indicating the cross section of coil 81 is omitted. Figure 7 to Figure 9 The reference numbers "0" to "49" recorded in the cross section of the coil 81 in show an example of the position and order of configuring the conductive wire 91 when winding the coil 81. That is, in each coil 81, the conductive wire 91 is wound around the pole teeth 65 in the order of the reference numbers "1" to "49". In addition, when viewed from the first direction D1, the conductive wire 91 is wound, for example, in a counterclockwise direction relative to the pole teeth 65. In addition, when viewed from the first direction D1, the conductive wire 91 can also be wound in a clockwise direction relative to the pole teeth 65. In addition, in each coil 81, in the portion overlapping with the pole teeth 65 in the circumferential direction C1, the conductive wire 91 extends along the axial direction A1.

[0035] like Figure 7As shown, in each insulator 71, a portion of the conductive wire 91 constituting the first layer of the coil 81 is arranged in each of the plurality of retaining grooves 74. In addition, the first layer of each coil 81 is referred to as the first layer 101. For example, in each coil 81, the first layer 101 is constituted by the conductive wire 91 disposed at the positions of reference numbers "0" to "11". In each coil 81, the portion of the conductive wire 91 constituting the first layer 101 is positioned relative to the insulator 71 in the first direction D1 by abutting against a pair of retaining surfaces 78a and 78b of each retaining groove 74. Since the plurality of retaining grooves 74 arranged in the first direction D1 are arranged at equal intervals in the first direction D1, the portion of the conductive wire 91 constituting the first layer 101 is wound around the pole teeth 65 at constant intervals in the first direction D1.

[0036] The plurality of holding grooves 74 arranged in the first direction D1 hold, for example, a portion of the conductive wire 91 constituting the first layer of the coil 81 at an interval such that a gap G1 is formed between the conductive wires 91 adjacent in the first direction D1 in the portion. That is, the plurality of holding grooves 74 arranged in the first direction D1 are arranged at an interval such that a gap G1 is formed between the conductive wires 91 adjacent in the first direction D1 in the first layer 101 and a portion of the conductive wire 91 constituting the first layer 101 can be held. Therefore, for example, in the first layer 101, a gap G1 is provided between the conductive wires 91 adjacent in the first direction D1.

[0037] The second layer of each coil 81 is referred to as the second layer 102. In each coil 81, the second layer 102 is arranged on the outer periphery of the first layer 101. For example, in each coil 81, the second layer 102 is composed of the conductive wires 91 arranged at the positions of reference numbers "12" to "21". In each coil 81, the portion of the conductive wire 91 that constitutes the second layer 102 is arranged so as to be embedded in a groove-shaped portion formed by the outer peripheral surfaces of the conductive wires 91 adjacent to each other in the first direction D1 in the first layer 101 with a gap G1 therebetween. For example, the conductive wire 91 arranged at the position of reference number "12" in the second layer 102 is embedded in the groove-shaped portion formed by the conductive wire 91 arranged at the position of reference number "8" and the conductive wire 91 arranged at the position of reference number "10" in the first layer 101. Furthermore, the conductive wire 91 arranged at the position of reference number "12" is positioned in the first direction D1 by the conductive wire 91 arranged at the position of reference number "8" and the conductive wire 91 arranged at the position of reference number "10". Incidentally, the position of the conductor 91 arranged at the position of reference number "12" in the first direction D1 is the middle of the conductor 91 arranged at the position of reference number "8" and the conductor 91 arranged at the position of reference number "10" in the first direction D1 which are in contact with the conductor 91. The conductors 91 arranged at the positions of reference numbers "13" to "21" are also positioned in the first direction D1 by the conductors 91 constituting the first layer 101. The portion of the conductor 91 constituting the second layer 102 is positioned relative to the insulator 71 in the first direction D1 by the portion of the conductor 91 constituting the first layer 101, and is thus wound around the pole teeth 65 at a constant interval along the first direction D1 on the outer periphery of the first layer 101.

[0038] In each coil 81, the third layer 103 as the third layer, the fourth layer 104 as the fourth layer, and the fifth layer 105 as the fifth layer are arranged in a manner embedded in the groove-shaped portion formed by the conductive wire 91 of the layer just wound, similarly to the second layer 102. Furthermore, in the portion of the third and subsequent layers of the conductive wires 91 constituting each coil 81, the portion that abuts against the two conductive wires 91 arranged in the first direction D1 of the layer just wound is positioned in the first direction D1 by the two conductive wires 91.

[0039] like Fig.10 and Fig.11As shown, the diameter of the wire 91 can be changed according to the specifications of the motor 50, etc., as long as it is within the range of the wire 91 that can be held by the holding groove 74. That is, each holding groove 74 can hold a plurality of wires 91 with different diameters. In addition, each holding groove 74 can hold a wire 91 of a thickness such that the outer peripheral surface of the wire 91 arranged in each holding groove 74 abuts against a pair of holding surfaces 78a, 78b of each holding groove 74. In addition, the wire 91 is a wire of a thickness such that the portion of the wire 91 to be wound as the second layer of the coil 81 can abut against two portions of the wire 91 held in any two holding grooves 74 adjacent to each other in the first direction D1, and the portion of the wire 91 to be wound as the second layer of the coil 81 can be arranged in the groove-shaped portion formed by the two portions.

[0040] exist Fig.10 and Fig.11 In FIG. 8 , the coil 81 is illustrated by a solid line when the conductive wire 91 constituting the coil 81 is a first conductive wire 91A having a first diameter D11. Fig.10 and Fig.11 In FIG. 8 , the coil 81 is illustrated by a double-dashed line when the conductor 91 constituting the coil 81 is a second conductor 91B having a second diameter D12 different from the first diameter D11. For example, the second diameter D12 is larger than the first diameter D11. Figure 7 to Figure 9 , only the coil 81 constituted by the conductive wire 91 serving as the first conductive wire 91A is shown.

[0041] Each holding surface 78a of the holding groove 74 is a surface including a common tangent line CL1 of the outer peripheral surface of the first conductive wire 91A and the outer peripheral surface of the second conductive wire 91B in the cross section of the holding groove 74. The outer peripheral surface of the first conductive wire 91A abuts against the holding surface 78a when the first conductive wire 91A is wound around the pole tooth 65 via the insulator 71, and the outer peripheral surface of the second conductive wire 91B abuts against the holding surface 78a when the second conductive wire 91B is wound around the pole tooth 65 via the insulator 71. In addition, each holding surface 78b of the holding groove 74 is a surface including a common tangent line CL2 of the outer peripheral surface of the first conductive wire 91A and the outer peripheral surface of the second conductive wire 91B in the cross section of the holding groove 74. The outer peripheral surface of the first conductive wire 91A abuts against the holding surface 78b when the first conductive wire 91A is wound around the pole tooth 65 via the insulator 71, and the outer peripheral surface of the second conductive wire 91B abuts against the holding surface 78b when the second conductive wire 91B is wound around the pole tooth 65 via the insulator 71. That is, the retaining surfaces 78a, 78b of each retaining groove 74 are configured so that, in the cross section of each retaining groove 74, the tangent line of the outer peripheral surface of the first conductive wire 91A when the first conductive wire 91A is arranged in the retaining groove 74 is the same as the tangent line of the outer peripheral surface of the second conductive wire 91B when the second conductive wire 91B is arranged in the retaining groove 74.

[0042] like Figure 7As shown, in each insulator 71, the first adjacent walls 72a, 72b respectively cover at least a portion of the first surface 63 at a position that is more deviated from the coil 81 in the first direction D1, and are adjacent to the coil 81 in the first direction D1. Moreover, the first adjacent walls 72a, 72b are respectively opposite to the coil 81 in the first direction D1. When viewed from the axial direction A1, each insulator 71 has the first adjacent walls 72a, 72b, for example, on both sides of the pole tooth 65 in a direction orthogonal to the first direction D1 and the axial direction A1. In each insulator 71, for example, the pole tooth covering portion 76 is located between the first adjacent wall 72a and the first adjacent wall 72b in the circumferential direction C1. In each insulator 71, the first adjacent walls 72a, 72b extend, for example, from the base end of the pole tooth covering portion 76, that is, from the end of the pole tooth covering portion 76 in the first direction D1 to both sides of the circumferential direction C1. In a state where the insulator 71 is mounted on the pole tooth 65 , the first adjacent walls 72 a , 72 b cover the first face 63 at both sides of the pole tooth 65 in the circumferential direction C1 .

[0043] In each insulator 71, the second adjacent walls 73a, 73b are adjacent to the coil 81 in the second direction D2 at a position offset in the second direction D2 from the coil 81. Moreover, the second adjacent walls 73a, 73b are respectively opposite to the coil 81 in the second direction D2. When viewed from the axial direction A1, each insulator 71 has the second adjacent walls 73a, 73b, for example, on both sides of the pole tooth 65 in a direction orthogonal to the first direction D1 and the axial direction A1. In each insulator 71, for example, the pole tooth covering portion 76 is located between the second adjacent wall 73a and the second adjacent wall 73b in the circumferential direction C1. In each insulator 71, the second adjacent walls 73a, 73b protrude from the front end region of the pole tooth covering portion 76, that is, from the end region of the pole tooth covering portion 76 in the second direction D2 to both sides of the circumferential direction C1. In a state where the insulator 71 is mounted on the pole tooth 65 , the second adjacent walls 73 a , 73 b are located between the circumferential protrusion 67 in the second direction D2 and the coil 81 , for example, at both sides of the pole tooth 65 in the circumferential direction C1 .

[0044] The second adjacent wall 73a may also have a first temporary retaining groove 73c. ​​For example, the first temporary retaining groove 73c is located in the front end area of ​​the second adjacent wall 73a in the circumferential direction C1. For example, the first temporary retaining groove 73c penetrates the second adjacent wall 73a in the axial direction A1. In addition, for example, the first temporary retaining groove 73c opens to the side opposite to the second adjacent wall 73b in the circumferential direction C1. In addition, the second adjacent wall 73b may also have a second temporary retaining groove 73d. For example, the second temporary retaining groove 73d is located in the front end area of ​​the second adjacent wall 73b in the circumferential direction C1. For example, the second temporary retaining groove 73d penetrates the second adjacent wall 73b in the axial direction A1. In addition, for example, the second temporary retaining groove 73d opens to the side opposite to the second adjacent wall 73a in the circumferential direction C1.

[0045] If the first end wire 82 is arranged in the first temporary holding groove 73c so as to penetrate the first temporary holding groove 73c in the axial direction A1, the first end wire 82 can be temporarily held by the insulator 71. In addition, if the second end wire 83 is arranged in the second temporary holding groove 73d so as to penetrate the second temporary holding groove 73d in the axial direction A1, the second end wire 83 can be temporarily held by the insulator 71. In addition, the yoke end surface covering portion 77 may also have the first temporary holding groove 73c and the second temporary holding groove 73d.

[0046] In each insulator 71, a plurality of limiting protrusions 75 protrude from at least one of the first adjacent walls 72a, 72b and the second adjacent walls 73a, 73b in a direction approaching the coil 81. For example, a plurality of limiting protrusions 75 may protrude from each of the first adjacent walls 72a, 72b. For example, each insulator 71 has two limiting protrusions 75 protruding from the first adjacent wall 72a. In addition, for example, each insulator 71 has two limiting protrusions 75 protruding from the first adjacent wall 72b. In addition, each insulator 71 may also have a plurality of limiting protrusions 75 protruding from each of the second adjacent walls 73a, 73b. For example, each insulator 71 has one limiting protrusion 75 protruding from the second adjacent wall 73a. In addition, for example, each insulator 71 has one limiting protrusion 75 protruding from the second adjacent wall 73b. In addition, the two limiting protrusions 75 protruding from the first adjacent wall 72a are set as limiting protrusions 75a, 75b. In addition, two limiting protrusions 75 protruding from the first adjacent wall 72b are set as limiting protrusions 75c and 75d. In addition, one limiting protrusion 75 protruding from the second adjacent wall 73a is set as a limiting protrusion 75e. In addition, one limiting protrusion 75 protruding from the second adjacent wall 73b is set as a limiting protrusion 75f. The limiting protrusions 75a to 75d of each insulator 71 protrude from the first adjacent walls 72a and 72b in the first direction D1, respectively. In addition, the limiting protrusions 75e and 75f of each insulator 71 protrude from the second adjacent walls 73a and 73b in the second direction D2, respectively.

[0047] like Figure 7 to Figure 9As shown, each of the limiting protrusions 75a to 75f has a contact surface 75X that contacts any one of the ends of the first direction D1 of the portion of the conductor wire 91 that constitutes the coil 81 and has an odd number of layers of 3 or more. For example, each of the limiting protrusions 75a to 75f has a contact surface 75X at the front end of each protruding direction. When viewed from the axial direction A1, the contact surface 75X of each of the limiting protrusions 75a to 75f is inclined so that the end 75Xb farther from the pole tooth 65 than the end 75Xa closer to the pole tooth 65 at both ends of the contact surface 75X in the direction orthogonal to the first direction D1 and the axial direction A1 is farther from the coil 81 in the first direction D1. Therefore, for example, when viewed from the axial direction A1, the closer the limiting protrusions 75a to 75f are to the pole tooth 65 in the direction orthogonal to the first direction D1 and the axial direction A1, the higher the protrusion height. In addition, when viewed from the axial direction A1, each contact surface 75X of the limiting protrusions 75a to 75f is inclined relative to the direction perpendicular to the first direction D1 and the axial direction A1. In addition, the direction perpendicular to the first direction D1 and the axial direction A1 when viewed from the axial direction A1 is referred to as the third direction D3. The third direction D3 is a direction perpendicular to the first direction D1 and the axial direction A1.

[0048] The restricting projections 75a to 75f extend, for example, in the axial direction A1. The restricting projections 75a to 75f each have a triangular shape, for example, when viewed from the axial direction A1. The contact surfaces 75X of the restricting projections 75a to 75f are formed, for example, in a planar shape parallel to the axial direction A1.

[0049] In each coil 81, the third layer 103 has third layer ends 3a, 3b, 3c, and 3d at both ends of the third layer 103 in the first direction D1. The third layer ends 3a to 3d extend in the axial direction A1, for example, at both sides of the pole teeth 65 in the third direction D3. The third layer ends 3a and 3b are arranged between the first adjacent wall 72a and the second adjacent wall 73a. The third layer end 3a is the conductor 91 arranged at the position of the reference number "32". The third layer end 3b is the conductor 91 arranged at the position of the reference number "22". The third layer ends 3c and 3d are arranged between the first adjacent wall 72b and the second adjacent wall 73b. The third layer end 3c is the conductor 91 arranged at the position of the reference number "33". The third layer end 3d is the conductor 91 arranged at the position of the reference number "23".

[0050] The abutting surface 75X of the limiting protrusion 75a abuts against the third layer end 3a. The third layer end 3a abuts against both the abutting surface 75X of the limiting protrusion 75a and the conductive wire 91 disposed at the position of the reference number "12". The abutting surface 75X of the limiting protrusion 75a suppresses the third layer end 3a from moving in the first direction D1 relative to the insulator 71. The conductive wire 91 disposed at the position of the reference number "12" suppresses the third layer end 3a from moving in the second direction D2, which is the opposite direction to the first direction D1, relative to the insulator 71. Therefore, the third layer end 3a is positioned in the first direction D1 by the abutting surface 75X of the limiting protrusion 75a and the conductive wire 91 disposed at the position of the reference number "12".

[0051] The abutting surface 75X of the limiting protrusion 75e abuts against the third layer end 3b. The third layer end 3b abuts against both the abutting surface 75X of the limiting protrusion 75e and the conductive wire 91 disposed at the position of the reference number "20". The abutting surface 75X of the limiting protrusion 75e limits the movement of the third layer end 3b in the second direction D2 relative to the insulator 71. The conductive wire 91 disposed at the position of the reference number "20" suppresses the movement of the third layer end 3b in the first direction D1 relative to the insulator 71. Therefore, the third layer end 3b is positioned in the first direction D1 by the abutting surface 75X of the limiting protrusion 75e and the conductive wire 91 disposed at the position of the reference number "20".

[0052] The contact surface 75X of the limiting protrusion 75c contacts the third layer end 3c. The third layer end 3c contacts both the contact surface 75X of the limiting protrusion 75c and the conductive wire 91 disposed at the position of the reference number "13". The third layer end 3c is positioned in the first direction D1 by the contact surface 75X of the limiting protrusion 75c and the conductive wire 91 disposed at the position of the reference number "13", similarly to the third layer end 3a.

[0053] The contact surface 75X of the limiting protrusion 75f contacts the third layer end 3d. The third layer end 3d contacts both the contact surface 75X of the limiting protrusion 75c and the conductive wire 91 disposed at the position of the reference number "21". The third layer end 3d is positioned in the first direction D1 by the contact surface 75X of the limiting protrusion 75f and the conductive wire 91 disposed at the position of the reference number "21", similarly to the third layer end 3b.

[0054] In each coil 81, the fifth layer 105 has fifth layer ends 5a, 5b as one of the ends of the fifth layer 105 in the first direction D1. The fifth layer ends 5a, 5b extend in the axial direction A1, for example, at both sides of the pole tooth 65 in the third direction D3. The fifth layer end 5a is arranged between the first adjacent wall 72a and the second adjacent wall 73a. The fifth layer end 5a is the conductor 91 arranged at the position of the reference number "48". The fifth layer end 5b is arranged between the first adjacent wall 72b and the second adjacent wall 73b. The fifth layer end 5b is the conductor 91 arranged at the position of the reference number "49".

[0055] The contact surface 75X of the limiting protrusion 75b contacts the fifth layer end 5a. The fifth layer end 5a contacts both the contact surface 75X of the limiting protrusion 75b and the conductive wire 91 disposed at the position of the reference number "34". The fifth layer end 5a is positioned in the first direction D1 by the contact surface 75X of the limiting protrusion 75b and the conductive wire 91 disposed at the position of the reference number "34" similarly to the third layer end 3a.

[0056] The contact surface 75X of the limiting protrusion 75d contacts the fifth layer end 5b. The fifth layer end 5b contacts both the contact surface 75X of the limiting protrusion 75d and the conductive wire 91 disposed at the position of the reference number "35". The fifth layer end 5b is positioned in the first direction D1 by the contact surface 75X of the limiting protrusion 75d and the conductive wire 91 disposed at the position of the reference number "35" similarly to the third layer end 3a.

[0057] like Figure 7 , Fig.10 and Fig.11 As shown, for example, each abutment surface 75X of the restriction protrusions 75a to 75f is a plane including a common tangent line CL3 of the outer peripheral surface of the first conductive wire 91A and the outer peripheral surface of the second conductive wire 91B when viewed from the axial direction A1, and the outer peripheral surface of the first conductive wire 91A abuts against the abutment surface 75X when the first conductive wire 91A is wound around the pole tooth 65 via the insulator 71, and the outer peripheral surface of the second conductive wire 91B abuts against the abutment surface 75X when the second conductive wire 91B is wound around the pole tooth 65 via the insulator 71. That is, each abutment surface 75X is set at an inclination angle with respect to the third direction D3 when viewed from the axial direction A1 so as to become a plane including both a tangent line of the outer peripheral surface of the first conductive wire 91A when the first conductive wire 91A is wound around the pole tooth 65 and a tangent line of the outer peripheral surface of the second conductive wire 91B when the second conductive wire 91B is arranged in the retaining groove 74.

[0058] For example, when viewed from the axial direction A1, the center O1 of the cross section of the first conductive wire 91A that contacts the contact surface 75X of the restriction protrusion 75a when the first conductive wire 91A is wound around the pole tooth 65 and the center O2 of the cross section of the second conductive wire 91B that contacts the contact surface 75X of the restriction protrusion 75a when the second conductive wire 91B is wound around the pole tooth 65 are located on a straight line L11 that is orthogonal to the first direction D1 and the axial direction A1. Similarly, the center O1 of the first conductive wire 91A that contacts the contact surface 75X of each of the restriction protrusions 75b to 75f and the center O2 of the second conductive wire 91B are located on a straight line that is orthogonal to the first direction D1 and the axial direction A1 when viewed from the axial direction A1. In addition, if the conductive wire 91 has a diameter that can be held by the holding groove 74, even if the diameter of the conductive wire 91 changes, the center of the cross section of each conductive wire 91 that contacts the restriction protrusions 75a to 75d is located on the straight line L11 when viewed from the axial direction A1, for example. Similarly, if the conductor 91 has a diameter that can be held by the holding groove 74, even if the diameter of the conductor 91 changes, the center of the cross section of each conductor 91 that contacts the limiting protrusions 75e and 75f is located on, for example, a straight line L12 when viewed from the axial direction A1. Therefore, for example, in each coil 81, the center of the cross section of the conductor 91 arranged along the third direction D3 at both sides of the pole teeth 65 in the third direction D3 is located at the same position in the first direction D1, that is, located on the same straight line orthogonal to the first direction D1 and the axial direction A1. For example, the center of the cross section of the conductor 91 arranged at the positions of reference numbers "34", "12", "13" and "35" arranged in the third direction D3 when viewed from the axial direction A1 is located on the straight line L13. In addition, for example, the center of the cross section of the conductor 91 arranged at the positions of reference numbers "46", "30", "8", "9", "31" and "47" arranged in the third direction D3 when viewed from the axial direction A1 is located on the straight line L14.

[0059] like Figure 7 and Fig.10 As shown, in each of the first adjacent walls 72a, 72b, the length of the contact surface 75X of the limiting protrusion 75 in the third direction D3 may be longer as it is farther from the pole tooth 65 along the third direction D3 when viewed from the axial direction A1. For example, the limiting protrusion 75b protruding from the first adjacent wall 72a is farther away from the pole tooth 65 along the third direction D3 when viewed from the axial direction A1 than the limiting protrusion 75a similarly protruding from the first adjacent wall 72a. Furthermore, the length X2 of the contact surface 75X of the limiting protrusion 75b in the third direction D3 may be longer than the length X1 of the contact surface 75X of the limiting protrusion 75a in the third direction D3.

[0060] In addition, the contact surface 75X of each restriction protrusion 75 contacts the end of the first direction D1 of three or more odd-numbered layers of the coil 81 when the conductive wire 91 of a diameter that can be retained by the retaining groove 74 is wound around the pole teeth 65 via the insulator 71. In addition, the contact surface 75X of each restriction protrusion 75 contacts the end of the first direction D1 of three or more odd-numbered layers of the coil 81 when the conductive wire 91 is wound around the pole teeth 65 at a constant interval along the first direction D1 from one end to the other end of each layer of the coil 81. In this case, the inclination angle of the contact surface 75X with respect to the third direction D3, the length of the contact surface 75X in the third direction D3, and the position of the contact surface 75X in the third direction D3 when viewed from the axial direction A1 are set so that the contact surface 75X of each restriction protrusion 75 contacts the end of the first direction D1 of three or more odd-numbered layers of the coil 81. Therefore, when the ends of the first direction D1 of each of the odd-numbered layers of coil 81 (3 or more) respectively abut against the abutment surface 75X, the conductive wire 91 is wound at a constant pitch in the first direction D1 from one end to the other end of the layer in the first direction D1 in any layer of coil 81.

[0061] like Figure 8 and Fig. 9 As shown in FIG. 1 , the most protruding tip 75Xc of each of the limiting protrusions 75a to 75f in the protruding direction may also be rounded. Figure 8 and Fig. 9 Although not shown in the figure, it has the same front end 75Xc as the restricting protrusions 75a, 75b, and 75e. For example, when viewed from the axial direction A1, each front end 75Xc of the restricting protrusions 75a to 75f is curved in an arc shape convex in the protruding direction.

[0062] (Effects of the Implementation Methods) The effects of this embodiment will be described. (1) The stator 51 includes a stator core 61 having an annular portion 66 having a first surface 63 extending along the reference axis L1 and in an annular shape centered on the reference axis L1, and a plurality of pole teeth 65 extending from the first surface 63 in a direction orthogonal to the reference axis L1. The stator 51 also includes a plurality of insulators 71 attached to the pole teeth 65, respectively, and a plurality of coils 81 wound around the pole teeth 65 so that the conductive wire 91 is formed in a plurality of layers of three or more through the insulators 71. Each of the insulators 71 includes a first adjacent wall 72a, 72b, which covers at least a portion of the first surface 63 at a position offset from the coil 81 in the first direction D1 from the front end toward the base end of the pole tooth 65, and is adjacent to the coil 81 in the first direction D1. In addition, each of the insulators 71 has second adjacent walls 73a, 73b adjacent to the coil 81 in the second direction D2 at a position deviated from the coil 81 in the second direction D2 from the base end toward the front end of the pole tooth 65. In addition, each of the insulators 71 has a plurality of retaining grooves 74 for arranging a portion of the first layer of the coil 81 in the conductive wire 91 extending along the winding direction C2 of the coil 81 with respect to the pole tooth 65. In addition, each of the insulators 71 has a plurality of restricting protrusions 75 protruding from at least one of the first adjacent walls 72a, 72b and the second adjacent walls 73a, 73b in a direction approaching the coil 81. The retaining grooves 74 are arranged at equal intervals in the first direction D1. Each of the holding grooves 74 has a pair of holding surfaces 78a and 78b at both ends in the first direction D1, and the pair of holding surfaces 78a and 78b are inclined relative to the first direction D1 in such a manner that the distance in the first direction D1 becomes wider as the distance approaches the opening 78d in the direction from the bottom 78c of the holding groove 74. The pair of holding surfaces 78a and 78b are in contact with the outer peripheral surface of the conductive wire 91 arranged in the holding groove 74. Each of the limiting protrusions 75 has a contact surface 75X that contacts the end of the coil 81 in the first direction D1 in the odd number of layers of 3 or more. When viewed from the direction along the reference axis L1, that is, the axial direction A1, the contact surface 75X is inclined in such a manner that the end 75Xb farther from the pole tooth 65 than the end 75Xa closer to the pole tooth 65 at both ends of the contact surface 75X in the direction orthogonal to the first direction D1 and the axial direction A1 is farther from the coil 81 in the first direction D1.

[0063] According to this structure, the pair of holding surfaces 78a, 78b of each of the holding grooves 74 are inclined with respect to the first direction D1 in such a manner that the distance in the first direction D1 becomes wider as the distance approaches the opening 78d in the direction from the bottom 78c of the holding groove 74. Therefore, even if the diameter of the wire 91 changes, as long as the wire 91 can be arranged in contact with the paired holding surfaces 78a and holding surfaces 78b, the portion of the first layer of the wire 91 constituting the coil 81 can be positioned in the first direction D1 by the holding groove 74.

[0064] In addition, the portion of the conductive wire 91 constituting the first layer of the coil 81 is arranged in the retaining grooves 74 arranged at equal intervals in the first direction D1, and is wound around the pole teeth 65 at a constant interval in the first direction D1. Moreover, the portion of the conductive wire 91 constituting the second layer of the coil 81 can be wound around the pole teeth 65 in a manner such that it is embedded in the groove-shaped portion formed by the outer peripheral surface of the conductive wire 91 adjacent to the conductive wire 91 in the first layer of the coil 81 in the first direction D1. Therefore, the portion of the conductive wire 91 constituting the second layer of the coil 81 is wound around the pole teeth 65 at a constant interval in the first direction D1. Similarly, the portion of the conductive wire 91 constituting the third layer and later of the coil 81 is also positioned in the first direction D1 by using the portion of the conductive wire 91 constituting the layer just wound, and is wound around the pole teeth 65 at a constant interval in the first direction D1.

[0065] Generally speaking, when the number of turns of the coil 81 is the same, the larger the diameter of the wire 91, the more the second layer and later of the coil 81 are arranged at a position farther from the outer peripheral surface of the pole tooth 65 when viewed from the first direction D1. In addition, generally speaking, when the number of turns of the coil 81 is the same, the larger the diameter of the wire 91, the longer the distance between the two ends of each layer of the coil 81 in the first direction D1 and the center of the coil 81 in the first direction D1 becomes. Moreover, when viewed from the axial direction A1, the abutment surface 75X of each of the restriction protrusions 75 is inclined in such a manner that the end 75Xb farther from the pole tooth 65 than the end 75Xa closer to the pole tooth 65 of the two ends of the abutment surface 75X in the direction orthogonal to the first direction D1 and the axial direction A1 is farther from the coil 81 in the first direction D1. That is, when viewed from the axial direction A1, the abutment surface 75X is inclined in such a manner that the distance between the abutment surface 75X and the center of the coil 81 in the first direction D1 becomes longer in the first direction as it is farther away from the pole tooth 65 in the direction orthogonal to the first direction D1 and the axial direction A1. Therefore, even if the diameter of the conductive wire 91 changes, the coil 81 can be wound around the pole teeth 65 with the same number of turns without changing the insulator 71. In addition, even if the diameter of the conductive wire 91 changes, each abutting surface 75X of the limiting protrusion 75 can abut against the end portion of the conductive wire 91 in the first direction D1 of the portion of the conductive wire 91 having an odd number of layers or more constituting the coil 81.

[0066] For example, when a conventional insulator that does not include the limiting protrusion 75 is used, a gap may be formed between the end of the odd-numbered layers of the coil and the insulator in the first direction D1 depending on the diameter of the wire. In contrast, since the insulator 71 of the present embodiment has the limiting protrusion 75, it is possible to suppress the formation of a gap between the end of the odd-numbered layers of the coil 81 and the insulator 71 in the first direction D1. Furthermore, by abutting the end of the portion of the wire 91 that constitutes more than three odd-numbered layers of the coil 81 in the first direction D1 with the abutting surface 75X, the end can be suppressed from moving away from the center of the coil 81 in the first direction D1. That is, even if the diameter of the wire 91 changes, it is possible to suppress the coil 81 from collapsing.

[0067] Thus, even if the diameter of the wire 91 constituting the coil 81 changes, the portion of the first layer of the wire 91 constituting the coil 81 can be wound at a constant interval in the first direction D1. In addition, even if the diameter of the wire 91 constituting the coil 81 changes, the collapse of the third layer and later of the coil 81 can be suppressed by the restriction protrusion 75 having the abutment surface 75X. Therefore, even if the diameter of the wire 91 changes, the design of the insulator 71 does not need to be changed. Therefore, even if the diameter of the wire 91 constituting the coil 81 changes, the collapse of the coil 81 can be suppressed, and the types of the insulator 71 can be reduced.

[0068] (2) Each abutment surface 75X of the limiting protrusion 75 is a plane including a common tangent CL3 of the outer peripheral surface of the first conductor 91A and the outer peripheral surface of the second conductor 91B when viewed from the axial direction A1. The outer peripheral surface of the first conductor 91A abuts against the abutment surface 75X when the first conductor 91A is wound around the pole tooth 65 via the insulator 71, and the outer peripheral surface of the second conductor 91B abuts against the abutment surface 75X when the second conductor 91B having a diameter different from that of the first conductor 91A (second diameter D12) is wound around the pole tooth 65 via the insulator 71.

[0069] According to this structure, regardless of whether the conductive wire 91 constituting the coil 81 is the first conductive wire 91A or the second conductive wire 91B, the end of the first direction D1 of the portion of the conductive wire 91 constituting the coil 81 in the odd-numbered layers can abut against the abutment surface 75X. In addition, regardless of whether the diameter of the conductive wire 91 constituting the coil 81 is any value between the first diameter D11 of the first conductive wire 91A and the second diameter D12 of the second conductive wire 91B, the end of the first direction D1 of the portion of the conductive wire 91 constituting the coil 81 in the odd-numbered layers can abut against the abutment surface 75X.

[0070] (3) The pair of retaining surfaces 78a, 78b of each of the retaining grooves 74 are surfaces including common tangents CL1, CL2 of the outer peripheral surface of the first conductor 91A and the outer peripheral surface of the second conductor 91B in the cross section of the retaining groove 74. The outer peripheral surface of the first conductor 91A abuts against the retaining surfaces 78a, 78b when the first conductor 91A is wound around the pole tooth 65 via the insulator 71, and the outer peripheral surface of the second conductor 91B abuts against the retaining surfaces 78a, 78b when the second conductor 91B having a diameter different from that of the first conductor 91A (second diameter D12) is wound around the pole tooth 65 via the insulator 71.

[0071] According to this structure, regardless of whether the conductive wire 91 constituting the coil 81 is the first conductive wire 91A or the second conductive wire 91B, the retaining groove 74 can position the conductive wire 91 disposed in the retaining groove 74 in the first direction D1 through the pair of retaining surfaces 78a, 78b. In addition, regardless of whether the diameter of the conductive wire 91 constituting the coil 81 is any value between the first diameter D11 of the first conductive wire 91A and the second diameter D12 of the second conductive wire 91B, the retaining groove 74 can position the conductive wire 91 disposed in the retaining groove 74 in the first direction D1 through the pair of retaining surfaces 78a, 78b.

[0072] (4) The insulator 71 has first adjacent walls 72a and 72b on both sides of the pole tooth 65 in the direction perpendicular to the first direction D1 and the axial direction A1 when viewed from the axial direction A1. A plurality of restricting protrusions 75 protrude from each of the first adjacent walls 72a and 72b. When viewed from the axial direction A1, the farther the restricting protrusion 75 is from the pole tooth 65 in the direction perpendicular to the first direction D1 and the axial direction A1, the longer the length of the abutting surface 75X of the restricting protrusion 75 in the direction perpendicular to the first direction D1 becomes.

[0073] Here, two types of coils 81 formed of conductive wires 91 having different diameters are compared. In the two types of coils 81, when comparing the positions of the same layer in the direction orthogonal to the first direction D1 and the axial direction A1, that is, the third direction D3, when viewed from the axial direction A1, the layer closer to the outside of the coil 81 has a larger positional deviation in the third direction D3 when viewed from the axial direction A1. Therefore, if the length of the abutting surface 75X in the third direction D3 of the abutting surface 75X of the limiting protrusion 75 farther from the pole tooth 65 along the third direction D3 when viewed from the axial direction A1 is longer, the end portion in the first direction D1 of the odd-numbered layer closer to the outside of the coil 81 is more likely to be arranged at a position overlapping with the abutting surface 75X in the first direction D1. In addition, in the two types of coils 81, when comparing the positions of the same layer in the third direction D3 when viewed from the axial direction A1, the layer closer to the inside of the coil 81 has a smaller positional deviation in the third direction D3 when viewed from the axial direction A1. Therefore, even if the length of the abutting surface 75X in the third direction D3 of the limiting protrusion 75 closer to the pole tooth 65 along the third direction D3 is shorter when viewed from the axial direction A1, the end in the first direction D1 of the odd-numbered layer close to the inner side of the coil 81 is easily arranged at a position overlapping with the abutting surface 75X in the first direction D1. Therefore, according to this structure, it is easy to make the abutting surface 75X of the limiting protrusion 75 abut against the end in the first direction D1 of any odd-numbered layer of more than 3 of the coil 81.

[0074] (5) The tip 75Xc that protrudes most in the protruding direction of each of the restricting protrusions 75 is rounded. With this configuration, when the wire 91 is wound around the pole tooth 65 via the insulator 71, even if the wire 91 contacts the tip 75Xc, damage to the wire 91 can be suppressed.

[0075] (6) The plurality of holding grooves 74 arranged in the first direction D1 hold portions of the conductive wires 91 constituting the first layer of the coil 81 at intervals such that gaps G1 are formed between conductive wires 91 adjacent to each other in the first direction D1 .

[0076] According to this structure, in the first layer of the coil 81, the conductive wires 91 adjacent to each other in the first direction D1 can be prevented from contacting each other. In addition, the second layer and later of the coil 81 is formed by winding the conductive wires 91 at the same intervals in the first direction D1 as in the first layer. Therefore, even in the second layer and later of the coil 81, since gaps are formed between the conductive wires 91 adjacent to each other in the first direction D1, it is possible to prevent the conductive wires 91 adjacent to each other in the first direction D1 from contacting each other. Therefore, it is possible to prevent the conductive wires 91 from being damaged due to the contact between adjacent portions of the conductive wires 91 in the first direction D1.

[0077] (7) Each of the retaining grooves 74 has a V-shape in cross section. According to this structure, the holding groove 74 has a simple shape. Therefore, it is possible to suppress the shape of the insulator 71 from being complicated due to the holding groove 74. In addition, with the holding groove 74 having a simple shape, the portion of the first layer of the wire 91 constituting the coil 81 can be easily positioned in the first direction D1 for a plurality of wires 91 having different diameters.

[0078] (Variation Example) The present embodiment can be implemented by making the following modifications. The present embodiment and the following modifications can be implemented in combination with each other within the scope of no technical contradiction.

[0079] ·like Fig.12 As shown in FIG. 1 , the stator 51 may include an insulator 71A instead of the insulator 71 of the above embodiment. The insulator 71A includes a restricting protrusion 75A instead of the restricting protrusion 75 of the above embodiment. Fig.12 In the embodiment, the same symbols are given to the same structures or corresponding structures as those in the above-mentioned embodiment. The limiting protrusion 75A can be elastically deformed in such a way that the abutting surface 75X moves away from the coil 81 along the first direction D1. In addition, the limiting protrusion 75A presses the conductive wire 91 abutting against the abutting surface 75X toward the center of the coil 81 in the first direction D1. For example, the third layer end 3a arranged at the position of reference number "32" is pressed toward the second direction D2 by the limiting protrusion 75A, thereby pressing the conductive wire 91 arranged at the position of reference number "34" and the conductive wire 91 arranged at the position of reference number "12".

[0080] In this way, the positions of the ends of the odd-numbered layers of the coil 81 in the first direction D1 are further stabilized. Therefore, it is possible to further suppress the coil 81 from collapsing. In addition, the insulator 71A may include the restriction protrusion 75 of the above-described embodiment and at least one restriction protrusion 75A.

[0081] ·like Fig.13 As shown, the stator 51 may include an insulator 71B instead of the insulator 71 of the above embodiment. The insulator 71B includes a first member 111 and a second member 112. The first member 111 includes a limiting protrusion 75. The second member 112 is formed separately from the first member 111 and is fixed to the first member 111. The first member 111 and the second member 112 may be formed of the same material or different materials. The first member 111 may be fixed to the second member 112 by, for example, snap-fitting. In addition, the first member 111 may be fixed to the second member 112 by, for example, bonding, pressing, welding, pasting, etc.

[0082] In this way, the shape of the first member 111 can be changed without changing the shape of the second member 112. Therefore, without changing the shape of the second member 112, for example, the number of the limiting protrusions 75 can be changed, the shape of the limiting protrusions 75 can be changed, and the position of the limiting protrusions 75 can be changed. Therefore, more types of wires 91 with different diameters can be used. In addition, the shape of the second member 112 can be changed without changing the shape of the first member 111. Therefore, by combining a plurality of first members 111 and second members 112, it is possible to cope with a plurality of types of the insulator 71 by using a smaller number of types of the first members 111 and second members 112 than the number of types of the insulator 71.

[0083] The plurality of holding grooves 74 arranged in the first direction D1 may hold, for example, a portion of the conductive wire 91 constituting the first layer of the coil 81 at intervals such that the gap G1 is not formed between adjacent conductive wires 91 in the first direction D1 .

[0084] The front end 75Xc of each of the restricting protrusions 75a to 75f may not be rounded. In the above embodiment, in each of the first adjacent walls 72a, 72b, when viewed from the axial direction A1, the farther away from the limiting protrusion 75 of the pole tooth 65 along the third direction D3, the longer the length of the abutment surface 75X in the third direction D3. However, the length of the abutment surface 75X in the third direction D3 may be equal in all the limiting protrusions 75, for example. In addition, the length of the abutment surface 75X in the third direction D3 is not limited to this, and may be set to an arbitrary length for each limiting protrusion 75.

[0085] The number of the limiting protrusions 75 may be changed as appropriate. The insulator 71 may have at least one limiting protrusion 75 protruding from at least one of the first adjacent walls 72a, 72b and the second adjacent walls 73a, 73b. Even in this case, the coil 81 can be prevented from collapsing at the end of the odd-numbered layers of the coil 81 in the first direction D1 that abut against the abutting surface 75X of the limiting protrusion 75.

[0086] The holding groove 74 may be provided only in the side surface covering portions 76b and 76c. In addition, the holding groove 74 may be provided only in the end surface covering portion 76a. The shape of the insulator 71 is not limited to that of the above-described embodiment. However, the insulator 71 has the first adjacent walls 72a, 72b, the second adjacent walls 73a, 73b, the plurality of retaining grooves 74, and the plurality of limiting protrusions 75. For example, the insulator 71 may also have the first temporary retaining groove 73c and the second temporary retaining groove 73d in the yoke end surface covering portion 77. In this case, the first temporary retaining groove 73c and the second temporary retaining groove 73d are formed, for example, in the shape of a groove that penetrates the yoke end surface covering portion 77 in the first direction D1 and opens in one direction of the axial direction A1.

[0087] The shape and structure of the stator core 61 may be changed as appropriate. For example, the number of the split cores 62 of the stator core 61 is not limited to 12, and may be a plurality. In addition, the stator core 61 may be a structure that is not split in the circumferential direction C1. In addition, the stator core 61 may have an annular portion 66 and a plurality of pole teeth 65 extending outward from the annular portion 66.

[0088] The technical ideas that can be grasped from the above-mentioned embodiments and modifications are described. (i) A stator as described in technical solution 1 or 2, wherein the pair of retaining surfaces of each of the retaining slots are surfaces that include a common tangent (CL1, CL2) of the outer peripheral surface of the first conductor and the outer peripheral surface of the second conductor in the cross section of the retaining slot, the outer peripheral surface of the first conductor (91A) abuts against the retaining surface when the first conductor as the above-mentioned conductor is wound around the above-mentioned pole tooth through the above-mentioned insulator, and the outer peripheral surface of the second conductor (91B) abuts against the retaining surface when the second conductor (91B) as the above-mentioned conductor having a diameter different from that of the first conductor is wound around the above-mentioned pole tooth through the above-mentioned insulator.

[0089] (ii) A stator as described in any one of technical solutions 1, 2 and (i), wherein the insulator has the first adjacent walls on both sides of the pole tooth in a direction perpendicular to the first direction when viewed from the direction along the reference axis, and a plurality of limiting protrusions protrude from each of the first adjacent walls, and when viewed from the direction along the reference axis, the farther away from the pole tooth along the direction perpendicular to the first direction, the longer the length of the abutment surface of the limiting protrusion in the direction perpendicular to the first direction is.

[0090] (iii) A stator as described in any one of technical solutions 1, 2, (i) and (ii), wherein the front end (75Xc) most protruding in the protruding direction of each of the above-mentioned limiting protrusions has a rounded corner.

[0091] (iv) A stator as described in any one of technical solutions (i) to (iii), wherein the plurality of retaining grooves arranged in the first direction retain a portion of the conductive wire constituting the first layer of the coil at a spacing such that a gap (G1) is formed between adjacent conductive wires in the first direction in the portion.

[0092] (v) The stator according to any one of the above-mentioned embodiments (i) to (iv), wherein each of the above-mentioned retaining grooves has a V-shape in cross section. (vi) A stator as described in any one of technical solutions (i) to (v), wherein at least one of the above-mentioned limiting protrusions can be elastically deformed in a manner such that the above-mentioned abutment surface moves away from the above-mentioned coil along the above-mentioned first direction, and presses the above-mentioned conductive wire abutting the above-mentioned abutment surface toward the center of the above-mentioned coil in the above-mentioned first direction.

[0093] (v ii) A stator as described in Technical Solution 1, Technical Solution 2 and any one of (i) to (vi), wherein the insulator comprises: a first component (111), the first component having the limiting protrusion; and a second component (112), the second component being separate from the first component and being used to fix the first component.

[0094] The above description is only illustrative. Those skilled in the art will recognize that in addition to the constituent elements and methods (manufacturing processes) listed to illustrate the technology of the present disclosure, more possible combinations and substitutions can be made. The present disclosure is intended to include all substitutions, deformations and changes within the scope of the present disclosure including the claims and notes.

[0095] Although the present disclosure is described based on the embodiments, it should be understood that the present disclosure is not limited to the above-mentioned embodiments and structures. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, various combinations and methods, and other combinations and methods containing only one element, above or below them, also belong to the scope and thought range of the present disclosure.

Claims

1. A stator, comprising: A stator core (61), the stator core having an annular portion (66) and a plurality of pole teeth (65), the annular portion having a first surface (63) extending along a reference axis (L1) and being in an annular shape centered on the reference axis, the plurality of pole teeth extending from the first surface in a direction orthogonal to the reference axis; A plurality of insulators (71, 71A, 71B), wherein the plurality of insulators are respectively mounted on the pole teeth; as well as a plurality of coils (81), wherein the plurality of coils are formed by winding a conductive wire (91) through the insulator so as to form a plurality of layers of three or more on the pole teeth; The insulators respectively include: a first adjacent wall (72a, 72b), the first adjacent wall covering at least a portion of the first surface at a position offset in a first direction (D1) from the coil and adjacent to the coil in the first direction, the first direction being from the front end toward the base end of the pole tooth; a second adjacent wall (73a, 73b), the second adjacent wall being adjacent to the coil in the second direction at a position offset in a second direction (D2) from the coil, the second direction being from the base end toward the front end of the pole tooth; a plurality of retaining grooves (74, 74a-74l) for arranging a portion of the first layer of the coil in the conductive wire extending along a winding direction (C2) of the coil relative to the pole teeth; and a plurality of limiting protrusions (75, 75a-75f, 75A) protruding from at least one of the first adjacent wall and the second adjacent wall toward a direction approaching the coil, The retaining grooves are arranged at equal intervals in the first direction, Each of the retaining grooves has a pair of retaining surfaces (78a, 78b) at both ends in the first direction, and the pair of retaining surfaces are inclined relative to the first direction in such a manner that the distance between the retaining surfaces in the first direction becomes wider as they approach the opening portion along a direction from the bottom (78c) of the retaining groove toward the opening portion (78d), The pair of holding surfaces are in contact with the outer peripheral surface of the wire arranged in the holding groove, respectively. The limiting protrusions each have a contact surface (75X) that contacts the end of the coil in the first direction in three or more odd-numbered layers. When viewed from the direction along the reference axis, the abutment surface is inclined in such a manner that the end portion (75Xb) farther away from the pole tooth is farther away from the coil in the first direction than the end portion (75Xa) closer to the pole tooth at both ends of the abutment surface in a direction orthogonal to the first direction.

2. The stator according to claim 1, characterized in that When observed from the direction along the reference axis, each of the abutment surfaces of the limiting protrusion is a plane including a common tangent (CL3) of the outer peripheral surface of the first conductor (91A) and the outer peripheral surface of the second conductor (91B), the outer peripheral surface of the first conductor abuts against the abutment surface when the first conductor as the conductor is wound around the pole tooth via the insulator, and the outer peripheral surface of the second conductor abuts against the abutment surface when the second conductor (91B) as the conductor having a diameter different from that of the first conductor is wound around the pole tooth via the insulator.

3. The stator according to claim 1, characterized in that: The pair of retaining surfaces of each of the retaining grooves are surfaces including common tangents (CL1, CL2) of the outer peripheral surface of the first conductor (91A) and the outer peripheral surface of the second conductor (91B) in the cross section of the retaining groove, the outer peripheral surface of the first conductor abuts against the retaining surface when the first conductor as the conductor is wound around the pole tooth through the insulator, and the outer peripheral surface of the second conductor abuts against the retaining surface when the second conductor as the conductor having a diameter different from that of the first conductor is wound around the pole tooth through the insulator.

4. The stator according to claim 1, characterized in that When viewed from the direction along the reference axis, the insulator has the first adjacent walls on both sides of the pole tooth in a direction orthogonal to the first direction. A plurality of the limiting protrusions protrude from each of the first adjacent walls, When viewed from the direction along the reference axis, the contact surface of the restriction protrusion of the pole tooth becomes longer in the direction perpendicular to the first direction as it becomes farther away from the contact surface of the restriction protrusion of the pole tooth in the direction perpendicular to the first direction.

5. The stator according to claim 1, characterized in that: A front end (75Xc) of each of the restricting protrusions that most protrudes in the protruding direction has a rounded corner.

6. The stator according to claim 1, characterized in that The plurality of holding grooves arranged in the first direction hold a portion of the conductive wire constituting the first layer of the coil at intervals such that a gap (G1) is formed between the conductive wires adjacent to each other in the first direction in the portion.

7. The stator according to claim 1, characterized in that Each of the retaining grooves is V-shaped in cross section.

8. The stator according to claim 1, characterized in that At least one of the restriction protrusions is elastically deformable so that the abutting surface moves away from the coil along the first direction, and presses the conductive wire abutting against the abutting surface toward the center of the coil in the first direction.

9. The stator according to claim 1, characterized in that: The insulator comprises: a first member (111) having the limiting protrusion; and a second member (112) which is separate from the first member and is used to fix the first member.

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