Insulator, stator and method for manufacturing the stator

Abstract

To provide an insulator capable of holding a terminal wire at the end of winding of a coil while suppressing an increase in the number of man-hours required for manufacturing a stator.SOLUTION: An insulator 71 is mounted on each of a plurality of split cores 62. Each of the plurality of split cores 62 has a back yoke portion 64 having an inside surface 63 and teeth 65 protruding from the inside surface 63 in the direction perpendicular to the reference axis and arranged in an annular shape around the reference axis to configure a stator core. The insulator 71 includes a teeth covering portion 72 covering at least a portion of the teeth 65, a yoke covering portion 73 covering at least a portion of the inside surface 63, and a regulatory protrusion 74 protruding from the yoke covering portion 73. The regulatory projection 74 protrudes from the yoke covering portion 73 in a direction R2 from the base end to the end part of the teeth 65 when the insulator 71 is in a state mounted on the split core 62. And the regulatory projection 74 is located adjacent to a coil 81 in a circumferential direction C1 as seen in a direction R1 heading from the tip to the base end of the teeth 65.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to an insulator, a stator, and a method for manufacturing a stator. [Background technology]

[0002] Conventionally, as described in Patent Document 1, a stator provided in a motor includes an annular stator core having a plurality of split cores each having teeth, and a coil wound around each tooth. The split cores are arranged in the circumferential direction so that each tooth extends in the radial direction. An insulator is attached to each split core. Each coil is wound around the tooth via the insulator. Each coil has a winding start terminal wire that is the end where the coil starts to wind, and a winding end terminal wire that is the end where the coil ends to wind.

[0003] In the stator described in Patent Document 1, each insulator has a groove for temporarily holding the terminal wire. The groove extends in the radial direction and opens to one side in the axial direction. Furthermore, each insulator has a pair of locking projections protruding from an inner wall surface of the groove. The pair of locking projections face each other in the circumferential direction. After the coil is wound around the tooth via the insulator, the terminal wire is pushed between the pair of locking projections and the bottom surface of the groove. This temporarily fixes the terminal wire in the groove. Then, with the terminal wire temporarily fixed in the groove, the multiple split cores are arranged in an annular shape. Therefore, during the process of arranging the multiple split cores in an annular shape, the terminal wire at the end of the winding is prevented from coming off the groove and the coil is prevented from collapsing. The terminal wire is removed from the groove after the multiple split cores are arranged in an annular shape. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-195647 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, as described in Patent Document 1, when the terminal wire is temporarily fixed between the locking protrusions and the bottom surface of the groove, a certain amount of force is applied to push the terminal wire toward the bottom surface of the groove so that it passes between the pair of locking protrusions. Therefore, after winding the coil around the teeth, and before performing the process of arranging the multiple split cores in an annular shape, a process of pushing the terminal wire between the locking protrusions and the bottom surface of the groove is added. Furthermore, after performing the process of arranging the multiple split cores in an annular shape, a process of removing the terminal wire from between the locking protrusions and the bottom surface of the groove is performed. Therefore, there is a concern that the number of steps in manufacturing the stator will increase.

[0006] The present invention has been made to solve the above-mentioned problems, and its object is to provide an insulator, a stator, and a method for manufacturing a stator that can hold the terminal wire at the end of the coil winding while suppressing an increase in the number of steps required for manufacturing the stator. [Means for solving the problem]

[0007] The insulator that solves the above problem has a back yoke portion (64) having an inner surface (63) and teeth (65) protruding from the inner surface in a direction perpendicular to a reference axis (L1), and is attached to each of a plurality of split cores (62) that are arranged in an annular shape centered on the reference axis and constitute a stator core (61), and is for electrically insulating the split cores from coils (81) wound around the teeth, the insulator having a teeth covering portion (72) that covers at least a portion of the teeth, a yoke covering portion (73) that covers at least a portion of the inner surface, and restricting projections (74, 74A, 74B, 74C, 74D) protruding from the yoke covering portion, and when the insulator is attached to the split cores, the restricting projections protrude from the yoke covering portion in a direction (R2) from the base ends toward the tips of the teeth, and are spaced apart from each other when viewed in a direction (R1) from the tips of the teeth toward the base ends. Through the insulatorAn insulator is located adjacent to the coil wound around the tooth in the circumferential direction (C1) around the reference axis.

[0008] According to the above aspect, in a state where the coil is wound around the tooth via the insulator, the restricting protrusion is located adjacent to the coil wound around the tooth in the circumferential direction around the reference axis when viewed in the direction from the tip to the base of the tooth. Therefore, when winding the coil around the tooth, the second terminal wire can be easily arranged between the portion of the coil wound around the tooth and the restricting protrusion. For example, as an extension of the operation of winding the coil around the tooth with a winding machine, the second terminal wire can be arranged between the portion of the coil wound around the tooth and the restricting protrusion by the winding machine. The second terminal wire arranged between the portion of the coil wound around the tooth and the restricting protrusion is prevented from moving away from the portion of the coil wound around the tooth by the restricting protrusion. Therefore, the second terminal wire can be held without the need for a process of pushing the second terminal wire into a groove to hold the second terminal wire as in the conventional case. As a result, the second terminal wire at the end of the winding of the coil can be held while preventing an increase in the manufacturing man-hours of the stator including the insulator.

[0009] The stator that solves the above problem includes a stator core (61) having a plurality of split cores (62), each having a back yoke portion (64) having an inner surface (63) and teeth (65) protruding from the inner surface in a direction perpendicular to a reference axis (L1), a plurality of insulators (71) attached to the split cores, respectively, and a plurality of coils (81) wound around the teeth, respectively, via the insulators, wherein the plurality of split cores are arranged in an annular shape centered on the reference axis, and each of the coils has a first terminal wire (83) which is an end portion where the winding starts and a second terminal wire (84) which is an end portion where the winding ends, Each of the insulators has a tooth covering portion (72) covering at least a portion of the tooth, a yoke covering portion (73) covering at least a portion of the inner surface, and a regulating protrusion (74, 74A, 74B, 74C, 74D) protruding from the yoke covering portion in a direction (R2) from the base end to the tip end of the tooth, and the regulating protrusion on each of the insulators is located adjacent to the coil wound around the tooth in the circumferential direction (C1) around the reference axis when viewed in the direction (R1) from the tip to the base end of the tooth, and is a stator located on the side of the tooth on the opposite side in the circumferential direction from the side on which the first terminal wire is arranged.

[0010] According to the above aspect, in a state where the coil is wound around the tooth via the insulator, the restricting protrusion is located adjacent to the coil wound around the tooth in the circumferential direction around the reference axis when viewed in the direction from the tip to the base of the tooth. Therefore, when winding the coil around the tooth, the second terminal wire can be easily arranged between the portion of the coil wound around the tooth and the restricting protrusion. For example, as an extension of the operation of winding the coil around the tooth with a winding machine, the second terminal wire can be arranged between the portion of the coil wound around the tooth and the restricting protrusion by the winding machine. Then, the second terminal wire arranged between the portion of the coil wound around the tooth and the restricting protrusion is prevented from moving away from the portion of the coil wound around the tooth by the restricting protrusion. Therefore, the second terminal wire can be held without the need for a process of pushing the second terminal wire into a groove to hold the second terminal wire as in the conventional case. As a result, the second terminal wire at the end of the coil winding can be held while preventing an increase in the number of steps required for manufacturing the stator.

[0011] In addition, in general, in a coil, the second terminal wire is often located on one of both sides of the tooth in the circumferential direction about the reference axis, opposite to the side where the first terminal wire is arranged. Therefore, according to the above embodiment, the restricting protrusion is likely to be located on the side of the tooth in the circumferential direction about the reference axis, where the second terminal wire is arranged. Therefore, when winding the coil, the second terminal wire can be easily held between the portion of the coil wound around the tooth and the restricting protrusion, without having to move the second terminal wire to the side of the tooth in the circumferential direction about the reference axis, where the first terminal wire is arranged.

[0012] A method for manufacturing a stator that solves the above-mentioned problems is a method for manufacturing a stator including a stator core (61) having a plurality of split cores (62), each having a back yoke portion (64) having an inner surface (63) and teeth (65) protruding from the inner surface in a direction perpendicular to a reference axis (L1), a plurality of insulators (71) attached to the split cores, and a plurality of coils (81) wound around the teeth via the insulators, each of the insulators having a tooth covering portion (72) covering at least a portion of the teeth, a yoke covering portion (73) covering at least a portion of the inner surface, and a restricting protrusion (74) protruding from the yoke covering portion, the restricting protrusion protruding from the yoke covering portion in a direction (R2) from a base end toward a tip end of the tooth when the insulator is attached to the split core, the split cores are positioned adjacent to the coils wound around the teeth in the circumferential direction around the reference axis when viewed in the direction (R1) from the tip to the base end of the teeth, and the method for manufacturing a stator includes an installation process for attaching the insulator to each of the split cores; a winding process, which follows the installation process, for winding a winding (82) around each of the teeth to form the coil having a first terminal wire (83) which is the start end of the winding and a second terminal wire (84) which is the end end of the winding; a pulling process, which follows the winding process, for pulling the second terminal wire with a force (F2) including an inward radial component (Fr2) perpendicular to the reference axis; and an arrangement process for arranging a plurality of the split cores in a ring shape centered on the reference axis, and in the winding process, the second terminal wire is arranged between the portion of the coil wound around the tooth and the regulating protrusion.

[0013] According to the above aspect, in a state where the coil is wound around the tooth via the insulator, the restricting protrusion is located at a position adjacent to the coil wound around the tooth in the circumferential direction around the reference axis when viewed in the direction from the tip to the base of the tooth. Therefore, in the winding process, the second terminal wire can be easily arranged between the portion of the coil wound around the tooth and the restricting protrusion. The second terminal wire arranged between the portion of the coil wound around the tooth and the restricting protrusion is prevented by the restricting protrusion from moving away from the portion of the coil wound around the tooth. Therefore, the second terminal wire can be held without performing a process of pushing the second terminal wire into a groove to hold the second terminal wire as in the conventional case. As a result, the second terminal wire can be held while preventing an increase in manufacturing man-hours when manufacturing a stator.

[0014] Furthermore, by performing the tensioning process, the second terminal wire can push the yoke covering portion with a force including an outward radial component perpendicular to the reference axis due to springback occurring in the winding. The restricting protrusion protrudes from the yoke covering portion. Therefore, when the second terminal wire is pushed against the yoke covering portion with a force including an outward radial component perpendicular to the reference axis, the second terminal wire is more likely to be maintained in a state adjacent to the restricting protrusion in the circumferential direction around the reference axis. Furthermore, the second terminal wire is less likely to move in the direction from the base end to the tip end of the tooth. Therefore, the second terminal wire can be more effectively prevented from moving over the restricting protrusion in the direction away from the tooth. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of a motor including a stator according to an embodiment; [Diagram 2] FIG. 4 is a perspective view of an insulator attached to a split core in one embodiment. [Diagram 3] FIG. 2 is a perspective view of an insulator according to an embodiment. [Figure 4] FIG. 2 is a plan view of an insulator according to an embodiment. [Diagram 5] FIG. 2 is a front view of an insulator according to an embodiment. [Figure 6] FIG. 4 is a plan view of a split core around which a coil is wound in one embodiment. [Figure 7] FIG. 4 is a plan view showing a part of a split core around which a coil is wound in one embodiment. [Figure 8] FIG. 4 is a front view showing a part of a split core around which a coil is wound in one embodiment. [Figure 9] FIG. 4 is a plan view showing a part of a split core around which a coil is wound in one embodiment. [Figure 10] FIG. 4 is a plan view showing a part of a split core around which a coil is wound in one embodiment. [Figure 11] FIG. 11 is a cross-sectional view showing a part of a split core around which a coil is wound in a modified example. [Figure 12] FIG. 11 is a cross-sectional view showing a part of a split core around which a coil is wound in a modified example. [Figure 13] FIG. 11 is a cross-sectional view showing a part of a split core around which a coil is wound in a modified example. [Figure 14] FIG. 11 is a cross-sectional view showing a part of a split core around which a coil is wound in a modified example. [Figure 15] FIG. 11 is a plan view of an insulator in a modified example. [Figure 16] FIG. 11 is a perspective view showing a portion of an insulator according to a modified example. [Figure 17] FIG. 11 is a perspective view showing a portion of an insulator according to a modified example. [Figure 18] FIG. 11 is a perspective view showing a portion of an insulator according to a modified example. [Figure 19] FIG. 11 is a perspective view showing a portion of an insulator according to a modified example. [Figure 20] FIG. 11 is a plan view showing a part of a split core around which a coil is wound in a modified example. [Figure 21] FIG. 11 is a plan view of a split core around which a coil is wound in a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of an insulator, a stator, and a method for manufacturing a stator will be described. In the attached drawings, components may be shown enlarged to facilitate understanding. In the attached drawings, the dimensional ratios of the components may differ from the actual ones or from those in other drawings.

[0017] 1, the motor 50 includes a stator 51 and a rotor 52. The stator 51 has an annular shape. The rotor 52 is disposed inside the stator 51. The rotor 52 has a rotating shaft 53.

[0018] (Configuration of stator 51) The stator 51 includes a stator core 61 , an insulator 71 , and a coil 81 .

[0019] As shown in FIGS. 1 and 2, the stator core 61 has 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 has a back yoke portion 64 having an inner surface 63, and teeth 65 protruding from the inner surface 63 in a direction perpendicular to a reference axis L1. The reference axis L1 coincides with the center of rotation of the rotating shaft 53 in the motor 50. Furthermore, the reference axis L1 coincides with the central axis of the stator core 61 in the stator core 61. The direction along the reference axis L1 is referred to as the "axial direction A1."

[0020] The multiple split cores 62 constituting the stator core 61 are arranged in an annular shape centered on the reference axis L1. The multiple split cores 62 are arranged in the circumferential direction C1 around the reference axis L1 so that the back yoke portion 64 of each split core 62 forms an annular shape as a whole. The circumferential direction C1 is the same direction as the circumferential direction of the stator 51. When the multiple split cores 62 are arranged in the circumferential direction C1, the inner side surface 63 is the radially inner side surface of the back yoke portion 64. The "radial direction" is a direction perpendicular to the reference axis L1. The radial direction is a direction perpendicular to the circumferential direction C1. In this state, each tooth 65 protrudes radially inward from each back yoke portion 64. Furthermore, in this state, each tooth 65 extends along the radial direction. In this state, the tip of each tooth 65 is the radially inner end of each tooth 65. Furthermore, in this state, the base end of each tooth 65 is the outer end of each tooth 65 in the radial direction.

[0021] (Configuration of Insulator 71) An insulator 71 is attached to each split core 62. The insulator 71 serves to electrically insulate the split core 62 from the coil 81 wound around the teeth 65 of the split core 62. Each insulator 71 is made of an insulating resin material. For example, two insulators 71 are attached to each split core 62 from both sides in the axial direction A1. The two insulators 71 attached to each split core 62 have, for example, the same shape.

[0022] 2 to 5, each insulator 71 includes a tooth covering portion 72 covering at least a portion of the teeth 65, a yoke covering portion 73 covering at least a portion of the inner surface 63, and a restricting protrusion 74 protruding from the yoke covering portion 73. The tooth covering portion 72, the yoke covering portion 73, and the restricting protrusion 74 are integrally molded.

[0023] In each insulator 71, the tooth covering portion 72 covers one of both end faces of the tooth 65 in the axial direction A1 and both end faces of the tooth 65 in the circumferential direction C1.

[0024] In each insulator 71, the yoke covering portion 73 covers a part of the inner surface 63 of the back yoke portion 64. The yoke covering portion 73 extends, for example, from a base end of the tooth covering portion 72, i.e., from a radially outer end of the tooth covering portion 72, to both sides in the circumferential direction C1 and one side in the axial direction A1. When the insulator 71 is attached to the split core 62, the yoke covering portion 73 covers the inner surface 63 on both sides of the teeth 65 in the circumferential direction C1.

[0025] The yoke covering portion 73 may have an end surface covering portion 75 that covers at least a portion of one of both end surfaces of the back yoke portion 64 in the axial direction A1. The end surface covering portion 75 extends along the axial direction A1 on the end surface of the back yoke portion 64. The end surface covering portion 75 has a first end 75a and a second end 75b at both ends of the end surface covering portion 75 in the axial direction A1. The second end 75b abuts against the end surface of the back yoke portion 64 in the axial direction A1. The first end 75a is the end of the end surface covering portion 75 opposite to the second end 75b in the axial direction A1.

[0026] The end surface covering portion 75 may have a first temporary holding groove 76a and a second temporary holding groove 76b. In each insulator 71, the first temporary holding groove 76a and the second temporary holding groove 76b are separated from each other in the circumferential direction C1. Each of the first temporary holding groove 76a and the second temporary holding groove 76b extends in the axial direction A1 from the first end 75a to the second end 75b. Each of the first temporary holding groove 76a and the second temporary holding groove 76b penetrates the end surface covering portion 75 in the radial direction. Each of the first temporary holding groove 76a and the second temporary holding groove 76b opens in the axial direction A1 at the first end 75a. Each of the widths of the first temporary holding groove 76a in the circumferential direction C1 and the width of the second temporary holding groove 76b in the circumferential direction C1 is equal to or slightly larger than the outer diameter D1 of the winding 82 described later.

[0027] 1 and 6, a coil 81 is wound around the teeth 65 of each split core 62 via an insulator 71 attached to each split core 62. Each coil 81 is made of a winding 82. The winding 82 is, for example, an insulated electric wire. The cross-sectional shape of the winding 82 is, for example, circular. Note that the cross-sectional shape of the winding 82 is not limited to a circular shape, and may be any of a polygonal shape, an elliptical shape, and any other shapes.

[0028] Each coil 81 has a first terminal wire 83 and a second terminal wire 84. In each coil 81, the first terminal wire 83 is the end where the winding begins. In each coil 81, the second terminal wire 84 is the end where the winding ends. Each coil 81 also has a coil body 85. In each coil 81, the coil body 85 is the portion between the first terminal wire 83 and the second terminal wire 84, and is the portion that is wound around the teeth 65 from above the tooth covering portion 72. In other words, the coil body 85 is the portion of the coil 81 that is wound around the teeth 65.

[0029] The coil 81 shown in FIG. 6 is shown in a cross section perpendicular to the reference axis L1, that is, perpendicular to the axial direction A1. The reference axis L1 is shown only in FIG. 1, and is not shown in FIG. 6. The axial direction A1 in FIG. 6 corresponds to a direction perpendicular to the paper surface. Hatching indicating that the coil 81 is a cross section is omitted in FIG. 6. The reference numbers "0" to "35" written in the cross section of the coil 81 in FIG. 6 indicate an example of the position and order in which the winding 82 is arranged when winding the coil 81. That is, in each coil 81, the winding 82 is wound around the teeth 65 in the order of the reference numbers "1" to "35". The winding 82 is wound around the teeth 65 in a counterclockwise direction when the split core 62 is viewed in a direction from the tip to the base end of the teeth 65. Hereinafter, the direction from the tip to the base end of the teeth 65 is referred to as the base end direction R1.

[0030] The first terminal wire 83 is disposed, for example, at a position adjacent to the base end of the tooth 65 in the circumferential direction C1. For example, the first terminal wire 83 is a portion extending in the axial direction A1 at the position of reference number "0" in the coil 81. The second terminal wire 84 is disposed, for example, at a position adjacent to the base end of the tooth 65 in the circumferential direction C1. The second terminal wire 84 is disposed, for example, on the opposite side to the side where the first terminal wire 83 is disposed, of both sides of the tooth 65 in the circumferential direction C1. That is, the tooth 65 may be located between the first terminal wire 83 and the second terminal wire 84. For example, the second terminal wire 84 is a portion extending in the axial direction A1 at the position of reference number "35" in the coil 81.

[0031] Each coil 81 may have a parallel wire 86 arranged adjacent to the second terminal wire 84 in a direction from the base end to the tip end of the tooth 65. Note that hereinafter, the direction from the base end to the tip end of the tooth 65 is referred to as a tip direction R2. The parallel wire 86 is arranged, for example, radially adjacent to the second terminal wire 84. The second terminal wire 84 may be located between the yoke covering portion 73 and the parallel wire 86 in the tip direction R2.

[0032] 2 to 8, the restricting protrusion 74 of each insulator 71 protrudes from the yoke covering portion 73 in the tip direction R2 when the insulator 71 is attached to the split core 62. The restricting protrusion 74 of each insulator 71 is located adjacent to the coil 81 wound around the tooth 65 in the circumferential direction C1 when viewed in the base end direction R1. In each insulator 71, the restricting protrusion 74 is located, for example, adjacent to the coil 81 in the circumferential direction C1 when viewed in the base end direction R1.

[0033] The restricting protrusion 74 of each insulator 71 is located on the outer periphery side of the coil 81 wound around the tooth 65 as viewed in the base end direction R1. In this case, the "outer periphery side" means the outer periphery side of the coil 81 when the tooth 65 is located on the inner periphery side of the coil 81 as viewed in the base end direction R1. That is, the "outer periphery side" does not mean the part of the stator 51 that is radially outward of the coil 81. The restricting protrusion 74 of each insulator 71 is located, for example, on the opposite side of the tooth 65 in the circumferential direction C1 to the side where the first terminal wire 83 is arranged. Also, the restricting protrusion 74 of each insulator 71 is located, for example, on the same side of the tooth 65 in the circumferential direction C1 as the side where the second terminal wire 84 is arranged.

[0034] The restricting protrusion 74 has, for example, a columnar shape extending along the axial direction A1. The restricting protrusion 74 has, for example, a semicircular shape when viewed from the axial direction A1. The restricting protrusion 74 has, for example, a constant cross-sectional shape perpendicular to the reference axis L1 when the insulator 71 is attached to the split core 62. The restricting protrusion 74 has, for example, a semicircular cross-sectional shape perpendicular to the reference axis L1 when the insulator 71 is attached to the split core 62, and the cross-sectional shape is constant along the axial direction A1.

[0035] The restricting protrusion 74 may have a reduced portion 91 at each end region at both ends in the axial direction A1. The reduced portion 91 protrudes less in the tip direction R2 as it moves away from the center of the restricting protrusion 74 in the axial direction A1 along the axial direction A1. That is, as viewed in the circumferential direction C1, the reduced portion 91 gradually decreases in height in the radial direction as it moves away from the center of the restricting protrusion 74 in the axial direction A1 along the axial direction A1. Also, the reduced portion 91 gradually narrows in width in the circumferential direction C1 as it moves away from the center of the restricting protrusion 74 in the axial direction A1 along the axial direction A1. Furthermore, the reduced portion 91 gradually reduces in cross-sectional area in a cross section perpendicular to the reference axis L1 as it moves away from the center of the restricting protrusion 74 in the axial direction A1 along the axial direction A1. For example, the reduced portion 91 has a semicircular cross-sectional shape perpendicular to the reference axis L1. The radius of each reduced portion 91 in a cross section perpendicular to the reference axis L1 gradually decreases as it moves away from the center of the regulating protrusion 74 in the axial direction A1 along the axial direction A1. Therefore, each reduced portion 91 has a shape, for example, a sector shape that is a quarter of a circle when viewed from the circumferential direction C1. Furthermore, each reduced portion 91 has a shape, for example, a quarter of a sphere with the same radius as the portion between the two reduced portions 91 in the regulating protrusion 74. Therefore, the surface of each reduced portion 91 has a spherical shape. Note that the portion between the two reduced portions 91 in the regulating protrusion 74 has a constant cross-sectional shape perpendicular to the axial direction A1.

[0036] Here, when the insulator 71 is attached to the split core 62, of the two ends of the restricting protrusion 74 in the circumferential direction C1 as viewed from the axial direction A1, the end farther from the tooth covering portion 72 is defined as a first end 92a, and the end closer to the tooth covering portion 72 is defined as a second end 92b. The restricting protrusion 74 may have an inclined portion 93 in an end region including the first end 92a of the restricting protrusion 74, the amount of protrusion from the yoke covering portion 73 gradually increasing as it approaches the second end 92b from the first end 92a along the circumferential direction C1. The restricting protrusion 74 has the inclined portion 93, for example, by having a semicircular shape as viewed from the axial direction A1.

[0037] 7, the restricting protrusion 74 of each insulator 71 has a portion that overlaps with the second terminal wire 84 in the circumferential direction C1. The restricting protrusion 74 of each insulator 71 protrudes from the yoke covering portion 73 in the tip direction R2 to a height that is greater than, for example, the radius Ra1 of the winding 82. For example, the restricting protrusion 74 protrudes from the yoke covering portion 73 in the tip direction R2 to a height that is greater than the radius Ra1 of the winding 82 and less than the outer diameter D1 of the winding 82.

[0038] When viewed from the axial direction A1, the width W of the gap G1 between the parallel wire 86 and the restricting protrusion 74 may be smaller than the outer diameter D1 of the winding 82. However, it is preferable that the width W is set to a size that allows the second terminal wire 84, which is a part of the winding 82, to pass through the gap G1 toward the gap between the yoke covering portion 73 and the parallel wire 86 due to the tension applied to the winding 82 by the winding machine when winding the coil 81 around the teeth 65.

[0039] As shown in FIG. 9, the second terminal wire 84, for example, contacts the yoke covering portion 73 and presses the yoke covering portion 73 with a force F1 including an outward radial component Fr1 perpendicular to the reference axis L1. Although the reference axis L1 is not shown in FIG. 9, the direction perpendicular to the paper surface in FIG. 9 is parallel to the reference axis L1. The "outward" direction in the outward radial component Fr1 perpendicular to the reference axis L1 is a direction along the base end direction R1 of each divided core 62. The second terminal wire 84 contacts, for example, a surface on the radially inner side of the yoke covering portion 73. The force F1 is, for example, a force due to springback caused by bending the winding 82. The force F1 may include a circumferential component Fc1. The circumferential component Fc1 is, for example, a component in a direction from the base end of the tooth 65 toward the restricting protrusion 74 along the circumferential direction C1 as viewed from the axial direction A1. The second terminal wire 84 may be in contact with the restricting projection 74 from the circumferential direction C1. The second terminal wire 84, for example, presses both the yoke covering portion 73 and the restricting projection 74 with a force F1.

[0040] (Method of manufacturing stator 51) Next, a method for manufacturing the stator 51 will be described. First, an attachment process is performed in which insulators 71 are attached to each of the split cores 62. The insulators 71 are formed in advance by resin molding such as injection molding. Two insulators 71 are attached to each of the split cores 62 from both sides in the axial direction A1. When the attachment process is completed, the split cores 62 have at least a portion of the teeth 65 covered by the tooth covering portions 72 and at least a portion of the inner surface 63 of the back yoke portion 64 covered by the yoke covering portion 73.

[0041] After the mounting step, a winding step is performed in which the winding 82 is wound around each tooth 65 to form a coil 81 having a first terminal wire 83 and a second terminal wire 84. The winding step is performed, for example, after the mounting step. In the winding step, the winding 82 is wound around the teeth 65 via the insulators 71 by a winding machine. The winding machine is, for example, a flyer-type winding machine. Note that the winding machine is not limited to the flyer-type, and may be, for example, a nozzle-type winding machine.

[0042] As shown in FIG. 6, the winding machine winds the winding 82 around the teeth 65 in the order of reference numbers "1" to "35". The winding machine first places the winding 82 at the position of reference number "1", i.e. places the first terminal wire 83. Thereafter, the winding machine forms a coil body 85 by winding the winding 82 around the teeth 65, for example, in a counterclockwise direction when viewing the split core 62 in the base end direction R1. At this time, the winding machine winds the winding 82 around the teeth 65 while placing the winding 82 at positions of reference numbers "2" to "34" in the order of reference numbers. Thereafter, the winding machine places the winding 82 at the position of reference number "35", i.e. places the second terminal wire 84.

[0043] As shown in FIG. 7, when the winding machine places the second terminal wire 84 at the position of reference number "35", the parallel wire 86 is placed at the position of reference number "29". The winding machine places the second terminal wire 84 at the position of reference number "35" while applying a tension to the winding 82 that is the same as the tension applied to the winding 82 when the coil body 85 is formed. That is, the second terminal wire 84 passes through the gap G1 between the restricting protrusion 74 and the parallel wire 86 toward the gap between the yoke covering part 73 and the parallel wire 86 due to the tension applied to the winding 82 by the winding machine. Thus, in the winding process, the second terminal wire 84 is placed at the portion of the coil 81 wound around the tooth 65, that is, between the coil body 85 and the restricting protrusion 74. That is, in the winding process, after the coil body 85 is wound, the winding machine continuously places the second terminal wire 84 at a position that is inside the restricting protrusion 74 when the tooth 65 is the center as viewed in the base end direction R1. When the second terminal wire 84 is placed at position "35," the winding of the coil 81 is completed.

[0044] When the winding step is completed, the coils 81 are wound around the teeth 65 of each of the split cores 62. In each coil 81, a first terminal wire 83 and a second terminal wire 84 are pulled out in one direction in the axial direction A1.

[0045] As shown in FIG. 10, after the winding process, a pulling process is performed in which the second terminal wire 84 is pulled with a force F2 including an inward radial component Fr2 perpendicular to the reference axis L1. Although the reference axis L1 is not shown in FIG. 10, the direction perpendicular to the paper surface in FIG. 10 is parallel to the reference axis L1. The "inward" direction in the inward radial component Fr2 perpendicular to the reference axis L1 is a direction along the tip direction R2 of each divided core 62. The pulling process is performed, for example, after the winding process. In the pulling process, the second terminal wire 84 is pulled by applying a force F2 to a portion of the second terminal wire 84 protruding from the coil body 85 to one side in the axial direction A1. The force F2 may include a circumferential component Fc2 in addition to the radial component Fr2. The circumferential component Fc2 is a component in a direction from the restricting protrusion 74 toward the base end of the tooth 65 along the circumferential direction C1 as viewed from the axial direction A1.

[0046] When the second terminal wire 84 is pulled by applying a force F2, the winding 82 is bent in a direction corresponding to the force F2 at or near the boundary between the second terminal wire 84 and the coil body 85 in the winding 82. In FIG. 10, the boundary between the second terminal wire 84 and the coil body 85 in the winding 82 is the end of the second terminal wire 84 located at the position of reference number "35" on the far side of the page. For example, the winding 82 is bent at or near the boundary between the second terminal wire 84 and the coil body 85 in the winding 82 so that the second terminal wire 84 approaches the parallel line 86 and the winding 82 located at the position of reference number "27". After the winding 82 is bent at or near the boundary between the second terminal wire 84 and the coil body 85 in the winding 82, the application of the force F2 to the second terminal wire 84 is stopped. This ends the pulling process.

[0047] As shown in FIG. 9, when the pulling process is completed, the second terminal wire 84 presses the yoke covering portion 73 with a force F1 including an outward radial component Fr1 due to springback. For example, the second terminal wire 84 contacts the yoke covering portion 73 and presses the yoke covering portion 73 with the force F1. Furthermore, the second terminal wire 84 may press the restricting protrusion 74 due to the springback. For example, the second terminal wire 84 presses the restricting protrusion 74 with a force F1 including a circumferential component Fc1 in a direction from the base end of the tooth 65 toward the restricting protrusion 74 along the circumferential direction C1. Then, the second terminal wire 84 is adjacent to the restricting protrusion 74 in the circumferential direction C1. Furthermore, the restricting protrusion 74 has a portion overlapping the second terminal wire 84 in the circumferential direction C1.

[0048] In addition, an arrangement step is performed in which the split cores 62 are arranged in an annular shape centered on the reference axis L1. The arrangement step is performed, for example, after the tension step. When the arrangement step is performed, it is preferable that the first terminal wire 83 is inserted into the first temporary holding groove 76a so as to cross the first temporary holding groove 76a in the base end direction R1. It is also preferable that the second terminal wire 84 is inserted into the second temporary holding groove 76b so as to cross the second temporary holding groove 76b in the base end direction R1. When the first terminal wire 83 and the second terminal wire 84 are inserted into the first temporary holding groove 76a and the second temporary holding groove 76b, respectively, the split core 62 around which the coil 81 is wound can be easily handled.

[0049] In the arrangement step, for example, twelve split cores 62 are arranged in the circumferential direction C1 such that the back yoke portions 64 of each split core 62 form an annular shape as a whole. At this time, each split core 62 is arranged such that the teeth 65 of each split core 62 protrude radially inward from the back yoke portion 64. When the arrangement step is completed, an annular stator core 61 made up of the multiple split cores 62 is completed.

[0050] As described above, the mounting step, winding step, tensioning step, and arrangement step are performed to complete the stator 51. In the completed stator 51, the first terminal wire 83 and the second terminal wire 84 may be taken out from the first temporary holding groove 76a and the second temporary holding groove 76b, respectively.

[0051] (Operation of the embodiment) The operation of this embodiment will be described. With the insulator 71 attached to the split core 62, the restricting protrusion 74 is located adjacent in the circumferential direction C1 to the coil 81 wound around the tooth 65 of the split core 62 when viewed in the base end direction R1. Therefore, when winding the coil 81 around the tooth 65, the second terminal wire 84 can be disposed between the coil body 85 and the restricting protrusion 74 by the tension applied to the winding 82 by the winding machine. Therefore, the processes of disposing the first terminal wire 83 on the tooth 65, winding the coil body 85, and further disposing the second terminal wire 84 between the coil body 85 and the restricting protrusion 74 can be continuously performed by the winding machine.

[0052] The second terminal wire 84 can be disposed between the coil body 85 and the restricting protrusion 74, adjacent to the restricting protrusion 74 in the circumferential direction C1. Therefore, the restricting protrusion 74 can restrict movement of the second terminal wire 84 in the direction away from the teeth 65 along the circumferential direction C1. For example, when the second terminal wire 84 tries to move away from the coil body 85 in the circumferential direction C1 due to springback occurring in the winding 82, the second terminal wire 84 comes into contact with the restricting protrusion 74 from the circumferential direction C1. Therefore, the restricting protrusion 74 restrains the second terminal wire 84 from moving in the direction away from the coil body 85 along the circumferential direction C1. Therefore, the second terminal wire 84 is held between the coil body 85 and the restricting protrusion 74.

[0053] The effects of this embodiment will be described. (1) The insulator 71 has a back yoke portion 64 having an inner surface 63 and teeth 65 protruding from the inner surface 63 in a direction perpendicular to the reference axis L1, and is attached to each of the multiple split cores 62 arranged in a ring shape centered on the reference axis L1 to form the stator core 61. The insulator 71 serves to electrically insulate the split cores 62 from the coils 81 wound around the teeth 65. The insulator 71 has a teeth covering portion 72 covering at least a portion of the teeth 65, a yoke covering portion 73 covering at least a portion of the inner surface 63, and a restricting protrusion 74 protruding from the yoke covering portion 73. The restricting protrusion 74 protrudes from the yoke covering portion 73 in the tip direction R2 when the insulator 71 is attached to the split core 62, and is located adjacent to the coils 81 wound around the teeth 65 in the circumferential direction C1 when viewed in the base direction R1.

[0054] According to the above embodiment, in a state where the coil 81 is wound around the tooth 65 via the insulator 71, the restricting protrusion 74 is located adjacent to the coil 81 wound around the tooth 65 in the circumferential direction C1 when viewed in the base end direction R1. Therefore, when the coil 81 is wound around the tooth 65, the second terminal wire 84 can be easily arranged between the restricting protrusion 74 and the part of the coil 81 wound around the tooth 65. That is, the second terminal wire 84 can be easily held between the coil body 85 and the restricting protrusion 74. For example, when the coil 81 is wound around the tooth 65 by the winding machine, the tension applied to the winding 82 by the winding machine can arrange the second terminal wire 84 between the coil body 85 and the restricting protrusion 74. The restricting protrusion 74 prevents the second terminal wire 84 arranged between the coil body 85 and the restricting protrusion 74 from moving away from the coil body 85. Therefore, the second terminal wire 84 can be held without the need for a process of pushing the second terminal wire 84 into a groove in order to hold the second terminal wire 84 as in the conventional case. As a result, the second terminal wire 84 can be held while suppressing an increase in the number of manufacturing steps required for manufacturing the stator 51.

[0055] Furthermore, when the coil 81 is wound around the teeth 65, the second terminal wire 84 is held between the coil body 85 and the restricting protrusion 74. Therefore, for example, when the split cores 62 are arranged in an annular shape after the coil 81 is wound around the teeth 65, the coil 81 is prevented from collapsing during the process of arranging the split cores 62 in an annular shape. This makes it easier to perform the process of arranging the split cores 62 in an annular shape. Furthermore, the second terminal wire 84 is not temporarily held between the coil body 85 and the restricting protrusion 74. Therefore, it is not necessary to perform the process of removing the second terminal wire 84 from between the coil body 85 and the restricting protrusion 74. These factors can improve the productivity of the stator 51 including the insulator 71.

[0056] Even after the stator 51 is completed, the second terminal wire 84 is held between the coil body 85 and the restricting protrusion 74. Therefore, when the motor 50 including the stator 51 vibrates, the coil 81 can be prevented from collapsing.

[0057] (2) When the insulator 71 is attached to the split core 62, of the two ends of the restricting protrusion 74 in the circumferential direction C1 as viewed from the direction along the reference axis L1, the end farther from the tooth covering portion 72 is defined as a first end 92a, and the end closer to the tooth covering portion 72 is defined as a second end 92b. The restricting protrusion 74 has an inclined portion 93 in an end region including the first end 92a of the restricting protrusion 74, the amount of protrusion from the yoke covering portion 73 gradually increasing as it approaches the second end 92b from the first end 92a along the circumferential direction C1.

[0058] According to the above embodiment, when winding the coil 81 around the tooth 65, the winding 82 wound around the tooth 65 can be prevented from getting caught on the restricting protrusion 74. Therefore, even if the insulator 71 has the restricting protrusion 74, it is easy to wind the winding 82 around the tooth 65.

[0059] (3) When the insulator 71 is attached to the split core 62, the restricting protrusion 74 has a constant cross-sectional shape perpendicular to the reference axis L1. According to the above embodiment, when manufacturing insulator 71 by resin molding, it is possible to manufacture insulator 71 having restricting protrusion 74 by using two molding dies that are divided in the direction along reference axis L1. That is, it is possible to manufacture insulator 71 having restricting protrusion 74 without using a complex molding die such as a slide die. Therefore, it is possible to prevent a decrease in productivity of insulator 71. Also, it is possible to prevent an increase in the manufacturing cost of insulator 71.

[0060] In this embodiment, the restricting protrusion 74 has a reduced portion 91 at each end region at both ends in the axial direction A1. The portion between the two reduced portions 91 in the restricting protrusion 74 has a constant cross-sectional shape perpendicular to the axial direction A1. The reduced portions 91 protrude less in the tip direction R2 as they move away from the center of the restricting protrusion 74 in the axial direction A1 along the axial direction A1. The reduced portions 91 also gradually narrow in width in the circumferential direction C1 as they move away from the center of the restricting protrusion 74 in the axial direction A1 along the axial direction A1. Furthermore, the reduced portions 91 gradually reduce in cross-sectional area perpendicular to the reference axis L1 as they move away from the center of the restricting protrusion 74 in the axial direction A1 along the axial direction A1. For these reasons, when the insulator 71 is removed from the mold, the reduced portions 91 do not hinder the two molds divided in the direction along the reference axis L1 from relatively moving away from each other along the reference axis L1. Therefore, even if the restricting projection 74 has the reduced portion 91, the insulator 71 can be manufactured using two molding dies that are separated in the direction along the reference axis L1.

[0061] (4) The stator 51 includes a stator core 61 having a plurality of split cores 62, each of which has a back yoke portion 64 having an inner surface 63 and teeth 65 protruding from the inner surface 63 in a direction perpendicular to the reference axis L1. The stator 51 also includes a plurality of insulators 71 attached to the split cores 62, and a plurality of coils 81 wound around the teeth 65 via the insulators 71. The split cores 62 are arranged in an annular shape centered on the reference axis L1. Each of the coils 81 has a first terminal wire 83 which is an end where the coils start to wind, and a second terminal wire 84 which is an end where the coils end to wind. Each of the insulators 71 has a tooth covering portion 72 which covers at least a portion of the teeth 65, a yoke covering portion 73 which covers at least a portion of the inner surface 63, and a restricting protrusion 74 which protrudes from the yoke covering portion 73 in the tip direction R2. The restricting protrusion 74 of each insulator 71 is located adjacent in the circumferential direction C1 to the coil 81 wound around the tooth 65 when viewed in the base end direction R1. The restricting protrusion 74 of each insulator 71 is located on the side opposite to the side on which the first terminal wire 83 is arranged, among both sides of the tooth 65 in the circumferential direction C1.

[0062] Generally, in the coil 81, the second terminal wire 84 is often located on one of the two sides of the tooth 65 in the circumferential direction C1 opposite to the side where the first terminal wire 83 is arranged. Therefore, according to the above embodiment, the restricting protrusion 74 is likely to be located on the one of the two sides of the tooth 65 in the circumferential direction C1 on the side where the second terminal wire 84 is arranged. Therefore, when winding the coil 81, after winding the coil main body 85, the second terminal wire 84 can be easily held between the coil main body 85 and the restricting protrusion 74 without having to move it to, for example, the one of the two sides of the tooth 65 in the circumferential direction C1 on the side where the first terminal wire 83 is arranged.

[0063] (5) The restricting projection 74 of each insulator 71 has a portion that overlaps with the second terminal wire 84 in the circumferential direction C1. According to the above embodiment, the restricting protrusion 74 can easily suppress movement of the second terminal wire 84 in the direction away from the teeth 65 along the circumferential direction C1.

[0064] (6) The winding 82 constituting each coil 81 has a circular cross-sectional shape. The restricting protrusion 74 of each insulator 71 protrudes from the yoke cover portion 73 to a height greater than the radius Ra1 of the winding 82 in the forward direction R2.

[0065] According to the above embodiment, the second terminal wire 84 is less likely to move over the restricting protrusion 74 in the direction away from the teeth 65 along the circumferential direction C1. Therefore, the second terminal wire 84 can be more effectively prevented from moving in the direction away from the teeth 65 along the circumferential direction C1. As a result, the second terminal wire 84 is more easily held between the coil body 85 and the restricting protrusion 74. Therefore, the coil 81 can be more effectively prevented from collapsing.

[0066] (7) Each of the coils 81 has a parallel wire 86 arranged adjacent to the second terminal wire 84 in the forward direction R2. The second terminal wire 84 is located between the yoke covering portion 73 and the parallel wire 86 in the forward direction R2. When viewed in the axial direction A1, the width W of the gap G1 between the parallel wire 86 and the restricting projection 74 is smaller than the outer diameter D1 of the winding 82 that constitutes the coil 81.

[0067] According to the above embodiment, the parallel wire 86 restricts movement of the second terminal wire 84 in the tip direction R2. Furthermore, when viewed from the axial direction A1, the width W of the gap G1 between the parallel wire 86 and the restricting protrusion 74 is smaller than the outer diameter D1 of the winding 82. This restricts the second terminal wire 84 from moving through the gap G1 in a direction away from the teeth 65. This makes it easier to hold the second terminal wire 84 between the yoke covering portion 73 and the parallel wire 86, and between the coil body 85 and the restricting protrusion 74. As a result, collapse of the coil 81 can be further restricted.

[0068] (8) The second terminal wire 84 contacts the yoke covering portion 73 and presses the yoke covering portion 73 with a force F1 including an outward radial component Fr1 perpendicular to the reference axis L1. According to the above embodiment, since the restricting protrusion 74 protrudes from the yoke covering portion 73 in the tip direction R2, the second terminal wire 84 is likely to be aligned adjacent to the restricting protrusion 74 in the circumferential direction C1. Furthermore, the second terminal wire 84 is less likely to move in the tip direction R2. Therefore, the second terminal wire 84 can be further prevented from moving over the restricting protrusion 74 in the direction away from the tooth 65.

[0069] (9) A method for manufacturing a stator 51, the stator 51 includes a stator core 61 having a plurality of split cores 62, each of which has a back yoke portion 64 having an inner surface 63 and teeth 65 protruding from the inner surface 63 in a direction perpendicular to a reference axis L1. The stator 51 further includes a plurality of insulators 71 attached to the split cores 62, and coils 81 wound around the teeth 65 via the insulators 71. Each of the insulators 71 includes a tooth covering portion 72 covering at least a part of the teeth 65, a yoke covering portion 73 covering at least a part of the inner surface 63, and a restricting protrusion 74 protruding from the yoke covering portion 73. The restricting protrusion 74 protrudes from the yoke covering portion 73 in the tip direction R2 when the insulator 71 is attached to the split core 62. The restricting protrusion 74 is located adjacent to the coil 81 wound around the tooth 65 in the circumferential direction C1 when viewed in the base direction R1 in the same state. The manufacturing method of the stator 51 includes a mounting step of mounting the insulator 71 on each of the split cores 62. The manufacturing method also includes a winding step after the mounting step of winding a wire 82 around each tooth 65 to form a coil 81 having a first terminal wire 83 at the winding start end and a second terminal wire 84 at the winding end end. The manufacturing method also includes a pulling step after the winding step of pulling the second terminal wire 84 with a force F2 including an inward radial component Fr2 perpendicular to the reference axis L1. The manufacturing method also includes an arrangement step of arranging the multiple split cores 62 in a ring shape centered on the reference axis L1. In the winding step, the second terminal wire 84 is arranged between the portion of the coil 81 wound around the tooth 65 and the restricting protrusion 74.

[0070] According to the above embodiment, in a state where the coil 81 is wound around the tooth 65 via the insulator 71, the restricting protrusion 74 is located at a position adjacent to the coil 81 wound around the tooth 65 in the circumferential direction C1 as viewed in the base end direction R1. Therefore, in the winding process, the second terminal wire 84 can be easily arranged between the portion of the coil 81 wound around the tooth 65 and the restricting protrusion 74. That is, the second terminal wire 84 can be easily held between the coil main body 85 and the restricting protrusion 74. The second terminal wire 84 arranged between the coil main body 85 and the restricting protrusion 74 is prevented from moving away from the coil main body 85 by the restricting protrusion 74. Therefore, the second terminal wire 84 can be held without performing a process of pushing the second terminal wire 84 into a groove to hold the second terminal wire 84 as in the conventional case. For these reasons, the second terminal wire 84 can be held while preventing an increase in the number of manufacturing steps when manufacturing the stator 51.

[0071] Furthermore, by performing the pulling process, the second terminal wire 84 can press the yoke covering portion 73 with a force F1 including an outward radial component Fr1 due to springback occurring in the winding 82. The restricting protrusion 74 protrudes from the yoke covering portion 73. Therefore, when the second terminal wire 84 presses the yoke covering portion 73 with a force F1 including an outward radial component Fr1, the second terminal wire 84 is likely to be maintained in a state adjacent to the restricting protrusion 74 in the circumferential direction C1. Furthermore, the second terminal wire 84 is less likely to move in the tip direction R2. Therefore, the second terminal wire 84 can be more effectively prevented from moving over the restricting protrusion 74 in a direction away from the teeth 65.

[0072] (10) The regulating projection 74 has reduced portions 91 in end regions at both ends in the axial direction A1. The reduced portions 91 protrude less in the tip direction R2 as they move away from the center of the regulating projection 74 in the axial direction A1 along the axial direction A1. Also, the reduced portions 91 have gradually narrower widths in the circumferential direction C1 as they move away from the center of the regulating projection 74 in the axial direction A1 along the axial direction A1. Furthermore, the reduced portions 91 have gradually smaller cross-sectional areas in cross sections perpendicular to the reference axis L1 as they move away from the center of the regulating projection 74 in the axial direction A1 along the axial direction A1.

[0073] According to the above aspect, when winding the coil 81 around the tooth 65, the winding 82 is less likely to get caught on both ends of the restricting protrusion 74 in the axial direction A1. Therefore, damage to the winding 82 by the restricting protrusion 74 can be suppressed. Furthermore, in this embodiment, the surface of each reduced portion 91 is spherical. Therefore, the winding 82 is less likely to get caught on the restricting protrusion 74. Therefore, damage to the winding 82 by the restricting protrusion 74 can be further suppressed.

[0074] This embodiment can be modified as follows. This embodiment and the following modified examples can be combined with each other to the extent that there is no technical contradiction. In the drawings used to explain the following modified examples, the same reference numerals are used to designate the same components as those in this embodiment and the corresponding components.

[0075] In the above embodiment, when manufacturing the stator 51, the steps are performed in the following order: mounting step, winding step, tensioning step, and arrangement step. However, the order of the steps is not limited to this. The winding step may be performed after the mounting step. The tensioning step may be performed after the winding step. The arrangement step may be performed before or after any of the mounting step, winding step, and tensioning step. For example, the arrangement step may be performed before the tensioning step.

[0076] The second terminal wire 84 does not have to press the yoke covering portion 73 with a force F1 including a radial component Fr1. Furthermore, the second terminal wire 84 does not have to contact the yoke covering portion 73. That is, in each coil 81, springback that presses the second terminal wire 84 against the yoke covering portion 73 does not have to occur in the winding 82. In this case, the manufacturing method of the stator 51 does not have to include a pulling step.

[0077] 11, the insulator 71 may have a restricting protrusion 74A instead of the restricting protrusion 74 of the above embodiment. In FIG. 11, the direction perpendicular to the paper surface corresponds to the axial direction A1. The restricting protrusion 74A is elastically deformable so as to increase the gap G1 between the parallel wire 86 and the restricting protrusion 74A when viewed from the axial direction A1. The restricting protrusion 74A is elastically deformable so as to move the tip of the restricting protrusion 74A radially outward and approach the radially inner surface of the yoke covering portion 73, for example.

[0078] The restricting protrusion 74A can be in a first state in which the width W of the gap G1 between the restricting protrusion 74A and the parallel wire 86 as viewed in the axial direction A1 becomes a first width W1 that is smaller than the outer diameter D1 of the winding 82. In FIG. 11, the restricting protrusion 74A in the first state is illustrated by a solid line. In addition, the restricting protrusion 74A can be in a second state in which the width W of the gap G1 between the restricting protrusion 74A and the parallel wire 86 as viewed in the axial direction A1 becomes a second width W2 that is larger than the first width W1 by elastically deforming. In FIG. 11, the restricting protrusion 74A in the second state is illustrated by a two-dot chain line. The second width W2 is, for example, equal to the outer diameter D1 of the winding 82.

[0079] When the coil 81 is wound around the tooth 65, after the parallel wire 86 is arranged and before the second terminal wire 84 is arranged between the tooth 65 and the restricting protrusion 74A in the circumferential direction C1, the restricting protrusion 74A is in the first state. When the second terminal wire 84 passes between the restricting protrusion 74A and the parallel wire 86 toward the space between the yoke covering portion 73 and the parallel wire 86, the second terminal wire 84 comes into contact with the restricting protrusion 74A and pushes the restricting protrusion 74A toward the space between the yoke covering portion 73 and the parallel wire 86. Note that FIG. 11 illustrates the second terminal wire 84 in the middle of passing between the restricting protrusion 74A and the parallel wire 86 toward the space between the yoke covering portion 73 and the parallel wire 86 by a two-dot chain line. The force with which the second terminal wire 84 pushes the restricting protrusion 74A is due to the tension applied to the winding 82 by the winding machine. In this manner, an external force is applied to the restricting protrusion 74A from the second terminal wire 84. The restricting protrusion 74A is elastically deformed from the first state to the second state by the external force applied from the second terminal wire 84. The restricting protrusion 74A returns to the first state after the second terminal wire 84 passes between the restricting protrusion 74A and the parallel wire 86. That is, the restricting protrusion 74A returns to the first state when the second terminal wire 84 is disposed between the coil body 85 and the restricting protrusion 74A as viewed in the base end direction R1.

[0080] In this way, when the coil 81 is wound around the tooth 65, the restricting protrusion 74A is in the second state, so that the second terminal wire 84 can easily pass between the restricting protrusion 74A and the parallel wire 86 toward the gap between the yoke covering portion 73 and the parallel wire 86. After the second terminal wire 84 passes between the restricting protrusion 74A and the parallel wire 86, the restricting protrusion 74A returns to the first state. Therefore, after the second terminal wire 84 passes between the restricting protrusion 74A and the parallel wire 86, the second terminal wire 84 can be prevented from moving through the gap G1 in a direction away from the tooth 65. Therefore, the second terminal wire 84 can be easily held between the yoke covering portion 73 and the parallel wire 86, and between the coil body 85 and the restricting protrusion 74A. As a result, the coil 81 can be further prevented from collapsing.

[0081] Furthermore, when the second terminal wire 84 passes between the restricting protrusion 74A and the parallel wire 86 toward the space between the yoke covering part 73 and the parallel wire 86, the force with which the second terminal wire 84 elastically deforms the restricting protrusion 74A from the first state to the second state is due to the tension applied to the winding 82 by the winding machine. Therefore, it is not necessary to add a separate process to change the restricting protrusion 74A from the first state to the second state.

[0082] The restricting protrusion 74A may have an inclined portion 93A in an end region including the first end 92a of the restricting protrusion 74A, the inclined portion 93A protruding from the yoke covering portion 73 gradually increasing from the first end 92a toward the second end 92b along the circumferential direction C1. In this way, the same effect as that of (2) in the above embodiment can be achieved.

[0083] In addition, the restricting protrusion 74A may have an inclined surface 95 at one end of the restricting protrusion 74A in the circumferential direction C1 closer to the tooth covering portion 72, as viewed from the axial direction A1 when the insulator 71 is attached to the split core 62. The inclined surface 95 forms an acute angle with respect to the surface of the yoke covering portion 73 from which the restricting protrusion 74A protrudes. In this case, when the second terminal wire 84 contacts the inclined surface 95, a reaction force acts on the second terminal wire 84 from the inclined surface 95. This reaction force includes a radially outward component and a circumferential component in the direction from the restricting protrusion 74A toward the tooth 65. Therefore, it becomes more difficult for the second terminal wire 84 to get over the restricting protrusion 74A in the direction away from the tooth 65 along the circumferential direction C1. As a result, the second terminal wire 84 is more easily held between the coil body 85 and the restricting protrusion 74A. Therefore, it becomes more easy to prevent the coil 81 from collapsing.

[0084] 12, the insulator 71 may have a restricting protrusion 74B instead of the restricting protrusion 74 of the above embodiment. In FIG. 12, the direction perpendicular to the paper surface corresponds to the axial direction A1. Each of the divided cores 62 has a recess 67 that opens to the inner surface 63, for example, in a range including a range overlapping with the restricting protrusion 74B when viewed in the base end direction R1. That is, the recess 67 is in a range including a range overlapping with the restricting protrusion 74B in the radial direction in the back yoke part 64. And, the yoke covering part 73 of each of the insulators 71 has an elastic piece 78 that is elastically deformable in the base end direction R1, for example, in a position overlapping with the recess 67 when viewed in the base end direction R1. The restricting protrusion 74B protrudes from the elastic piece 78 in the tip end direction R2.

[0085] The restricting protrusion 74B has a triangular shape when viewed from the axial direction A1, for example. The restricting protrusion 74B may have an inclined portion 93A in an end region including the first end 92a of the restricting protrusion 74B, the inclined portion 93A protruding from the yoke covering portion 73 gradually increasing from the first end 92a toward the second end 92b along the circumferential direction C1. When the restricting protrusion 74B has the inclined portion 93A, it is possible to achieve the same effect as that of the above embodiment (2). The second end 92b of the restricting protrusion 74B has a planar shape parallel to the tip direction R2 when viewed from the axial direction A1.

[0086] The elastic piece 78 extends, for example, along the circumferential direction C1 from a base end to a tip end of the elastic piece 78. For example, the tip end of the elastic piece 78 is located farther from the tooth 65 along the circumferential direction C1 than the base end of the elastic piece 78. Note that the elastic piece 78 may extend along the reference axis L1 from the base end to the tip end of the elastic piece 78.

[0087] The elastic piece 78 is elastically deformable so as to increase the gap G1 between the parallel wire 86 and the restricting protrusion 74B when viewed from the axial direction A1. Specifically, the elastic piece 78 is elastically deformable so that the tip of the elastic piece 78 is displaced in the base end direction R1 relative to the base end of the elastic piece 78. That is, the elastic piece 78 is elastically deformable so that the tip of the elastic piece 78 is displaced radially outward relative to the base end of the elastic piece 78. When the elastic piece 78 is elastically deformed as described above while the insulator 71 is attached to the split core 62, a part of the elastic piece 78 including the tip of the elastic piece 78 enters the recess 67. In this way, the part of the elastic piece 78 including the tip of the elastic piece 78 enters the recess 67, so that the elastic piece 78 is allowed to be elastically deformed so that the tip of the elastic piece 78 is displaced radially outward relative to the base end of the elastic piece 78.

[0088] The elastic piece 78 can be in a normal state in which the restricting protrusion 74B is disposed at a first position where the width W of the gap G1 between the restricting protrusion 74B and the parallel wire 86 is a first width W1 smaller than the outer diameter D1 of the winding 82 as viewed from the axial direction A1. Note that in FIG. 12, the elastic piece 78 in the normal state is illustrated by a solid line. Furthermore, in FIG. 12, the restricting protrusion 74B disposed at the first position is illustrated by a solid line. Furthermore, by elastically deforming, the elastic piece 78 can be in a deformed state in which the restricting protrusion 74B is disposed at a second position where the width W of the gap G1 between the restricting protrusion 74B and the parallel wire 86 is a second width W2 larger than the first width W1 as viewed from the axial direction A1. Note that in FIG. 12, the elastic piece 78 in the deformed state is illustrated by a two-dot chain line. Furthermore, in FIG. 12, the restricting protrusion 74B disposed at the second position is illustrated by a two-dot chain line.

[0089] When the coil 81 is wound around the tooth 65, after the parallel wire 86 is arranged and before the second terminal wire 84 is arranged between the tooth 65 and the restricting protrusion 74B in the circumferential direction C1, the elastic piece 78 is in the normal state. Therefore, the restricting protrusion 74B is arranged in the first position. Then, when the second terminal wire 84 passes between the restricting protrusion 74B and the parallel wire 86 toward the gap between the yoke covering part 73 and the parallel wire 86, the second terminal wire 84 comes into contact with the restricting protrusion 74B and pushes the restricting protrusion 74B so as to widen the gap G1. Note that in FIG. 12, the second terminal wire 84 is illustrated by a two-dot chain line while passing between the restricting protrusion 74B and the parallel wire 86 toward the gap between the yoke covering part 73 and the parallel wire 86. The force with which the second terminal wire 84 pushes the restricting protrusion 74B is due to the tension applied to the winding 82 by the winding machine. Therefore, an external force is applied to the restricting protrusion 74B from the second terminal wire 84. The elastic piece 78 is elastically deformed from the normal state to the deformed state by the external force from the second terminal wire 84 applied to the elastic piece 78 via the restricting protrusion 74B. The elastic piece 78 returns to the normal state after the second terminal wire 84 passes between the restricting protrusion 74B and the parallel wire 86. That is, the elastic piece 78 returns to the normal state when the second terminal wire 84 is disposed between the coil body 85 and the restricting protrusion 74B as viewed in the base end direction R1.

[0090] In this way, when the coil 81 is wound around the tooth 65, the elastic piece 78 is deformed, so that the second terminal wire 84 can easily pass between the restricting protrusion 74B and the parallel wire 86 toward the gap between the yoke covering portion 73 and the parallel wire 86. After the second terminal wire 84 passes between the restricting protrusion 74B and the parallel wire 86, the elastic piece 78 returns to its normal state. Therefore, after the second terminal wire 84 passes between the restricting protrusion 74B and the parallel wire 86, the second terminal wire 84 can be prevented from moving through the gap G1 in a direction away from the tooth 65. Therefore, the second terminal wire 84 can be easily held between the yoke covering portion 73 and the parallel wire 86, and between the coil body 85 and the restricting protrusion 74B. As a result, the coil 81 can be further prevented from collapsing.

[0091] Furthermore, the force with which the second terminal wire 84 elastically deforms the elastic piece 78 from the normal state to the deformed state when the second terminal wire 84 passes between the restricting projection 74B and the parallel wire 86 toward the space between the yoke covering portion 73 and the parallel wire 86 is due to the tension applied to the winding 82 by the winding machine. Therefore, it is not necessary to add a separate process for changing the elastic piece 78 from the normal state to the deformed state.

[0092] 12, the shape of the restricting protrusion 74B is not limited to that shown in FIG.

[0093] As shown in FIG. 13, the insulator 71 may have a restricting protrusion 74C instead of the restricting protrusion 74 of the above embodiment. In FIG. 13, the direction perpendicular to the paper surface corresponds to the axial direction A1. The restricting protrusion 74C is elastically deformable so as to increase the gap G1 between the parallel wire 86 and the restricting protrusion 74C when viewed from the axial direction A1. When viewed from the axial direction A1, the restricting protrusion 74C has a plate shape curved in an arc, for example. The restricting protrusion 74C is curved in an arc so as to protrude in the tip direction R2. The restricting protrusion 74C may have the inclined portion 93 of the above embodiment. When the restricting protrusion 74C has the inclined portion 93, the same effect as that of the above embodiment (2) can be achieved.

[0094] The restricting protrusion 74C elastically deforms to extend along the circumferential direction C1, thereby reducing the protruding height from the yoke covering portion 73 in the tip direction R2. In other words, the restricting protrusion 74C elastically deforms so that both ends of the restricting protrusion 74C in the circumferential direction C1 move away from each other, thereby reducing the protruding height from the yoke covering portion 73 in the tip direction R2. Furthermore, as the protruding height of the restricting protrusion 74C from the yoke covering portion 73 in the tip direction R2 decreases, the width W between the parallel wire 86 and the restricting protrusion 74C increases.

[0095] The restricting protrusion 74C of each insulator 71 can be in a first state in which the width W of the gap G1 between the restricting protrusion 74C and the parallel wire 86 as viewed in the axial direction A1 becomes a first width W1 that is smaller than the outer diameter D1 of the winding 82. In FIG. 13, the restricting protrusion 74C in the first state is illustrated by a solid line. In addition, the restricting protrusion 74C can be in a second state in which the width W of the gap G1 between the restricting protrusion 74C and the parallel wire 86 as viewed in the axial direction A1 becomes a second width W2 that is larger than the first width W1 by elastically deforming. In FIG. 13, the restricting protrusion 74C in the second state is illustrated by a two-dot chain line.

[0096] When the coil 81 is wound around the tooth 65, after the parallel wire 86 is arranged and before the second terminal wire 84 is arranged between the tooth 65 and the restricting protrusion 74C in the circumferential direction C1, the restricting protrusion 74C is in the first state. When the second terminal wire 84 passes between the restricting protrusion 74C and the parallel wire 86 toward the gap between the yoke covering portion 73 and the parallel wire 86, the second terminal wire 84 contacts the restricting protrusion 74C. Furthermore, the second terminal wire 84 presses the restricting protrusion 74 so as to lower the protruding height of the restricting protrusion 74C from the yoke covering portion 73 in the base end direction R1 due to the tension applied to the winding 82 by the winding machine. That is, an external force is applied to the restricting protrusion 74C from the second terminal wire 84. The restricting protrusion 74C is elastically deformed so as to extend along the circumferential direction C1 due to the external force applied from the second terminal wire 84, and the protruding height from the yoke covering portion 73 in the tip end direction R2 is lowered. As a result, the restricting protrusion 74C changes from the first state to the second state. The restricting protrusion 74C returns to the first state after the second terminal wire 84 passes between the restricting protrusion 74C and the parallel wire 86. That is, the restricting protrusion 74C returns to the first state when the second terminal wire 84 is disposed between the coil body 85 and the restricting protrusion 74C as viewed in the base end direction R1.

[0097] In this way, when the coil 81 is wound around the tooth 65, the restricting protrusion 74C is in the second state, so that the second terminal wire 84 can easily pass between the restricting protrusion 74C and the parallel wire 86 toward the gap between the yoke covering portion 73 and the parallel wire 86. After the second terminal wire 84 passes between the restricting protrusion 74C and the parallel wire 86, the restricting protrusion 74C returns to the first state. Therefore, after the second terminal wire 84 passes between the restricting protrusion 74C and the parallel wire 86, the second terminal wire 84 can be prevented from moving through the gap G1 in a direction away from the tooth 65. Therefore, the second terminal wire 84 can be easily held between the yoke covering portion 73 and the parallel wire 86, and between the coil body 85 and the restricting protrusion 74C. As a result, the coil 81 can be further prevented from collapsing.

[0098] Moreover, the restricting protrusion 74C changes from the first state to the second state by elastically deforming so as to extend in the circumferential direction C1. Therefore, the split core 62 does not need to have a recess for allowing the elastic deformation of the restricting protrusion 74C. This makes it possible to prevent the shape of the split core 62 from becoming complicated, while also preventing the second terminal wire 84 from moving through the gap G1 in a direction away from the teeth 65.

[0099] Furthermore, the force with which the second terminal wire 84 elastically deforms the restricting protrusion 74C from the first state to the second state when the second terminal wire 84 passes between the restricting protrusion 74C and the parallel wire 86 toward the space between the yoke covering part 73 and the parallel wire 86 is due to the tension applied to the winding 82 by the winding machine. Therefore, there is no need to add a separate process for changing the restricting protrusion 74C from the first state to the second state.

[0100] As shown in FIG. 14, the restricting protrusion 74C may have a mountain shape protruding in the tip direction R2 when viewed from the axial direction A1. For example, the restricting protrusion 74C may have a plate shape curved to form a triangle when viewed from the axial direction A1. The restricting protrusion 74C may have an inclined portion 93A. In FIG. 14, the restricting protrusion 74C in the first state is illustrated by a solid line. Furthermore, in FIG. 14, the restricting protrusion 74C in the second state is illustrated by a two-dot chain line. In FIG. 14, the second terminal wire 84 is illustrated by a two-dot chain line while passing between the restricting protrusion 74C and the parallel wire 86 toward the gap between the yoke covering part 73 and the parallel wire 86. This can also produce the same effect as the example shown in FIG. 13.

[0101] When viewed from the axial direction A1, the width W of the gap G1 between the parallel wire 86 and the restricting protrusion 74 may be equal to the outer diameter D1 of the winding 82. Also, the width W of the gap G1 may be larger than the outer diameter D1 of the winding 82.

[0102] Each of the coils 81 does not have to have the parallel wires 86 . The restricting protrusion 74 of each insulator 71 may have a protruding height from the yoke covering portion 73 in the forward direction R2 equal to or smaller than the radius Ra1 of the winding 82. In addition, the restricting protrusion 74 may have a protruding height from the yoke covering portion 73 in the forward direction R2 that is equal to or larger than the outer diameter D1 of the winding 82.

[0103] 15 , the insulator 71 may have restricting protrusions 74 on both sides of the tooth covering portion 72 in the circumferential direction C1 when viewed from the axial direction A1 when the insulator 71 is attached to the split core 62. In this way, regardless of which side of the tooth covering portion 72 the second terminal wire 84 is arranged on in the circumferential direction C1, the second terminal wire 84 can be easily held between the restricting protrusions 74 and the coil body 85.

[0104] The cross-sectional shape of the winding 82 does not have to be circular. The cross-sectional shape of the winding 82 may be any shape, such as an ellipse, a racetrack shape, a polygonal shape, or any other shape. As shown in FIG. 16, the restriction protrusion 74 does not necessarily have to have the reduced portion 91.

[0105] In the case where the cross-sectional shape of the restriction protrusion 74 perpendicular to the reference axis L1 is constant along the axial direction A1, the cross-sectional shape is not limited to a semicircular shape. For example, as shown in FIG. 17, the sectional shape of the restriction protrusion 74 perpendicular to the reference axis L1 may be rectangular.

[0106] Also, for example, as shown in FIG. 18, the restricting protrusion 74 may have a triangular cross section perpendicular to the reference axis L1. For example, the regulating protrusion 74 may have a trapezoidal cross-sectional shape perpendicular to the reference axis L1. For example, the regulating protrusion 74 may have a polygonal shape other than a square or a triangle cross-sectional shape perpendicular to the reference axis L1. For example, the regulating protrusion 74 may have a quarter circle cross-sectional shape perpendicular to the reference axis L1 or any other shape. Even in this case, the same effect as that of the above embodiment (3) can be achieved.

[0107] 19, the cross-sectional shape of the restriction protrusion 74 perpendicular to the reference axis L1 may not be constant along the axial direction A1. The restriction protrusion 74 shown in FIG 19 has a semispherical shape.

[0108] As shown in FIG. 20, the insulator 71 may have a restricting protrusion 74D instead of the restricting protrusion 74 of the above embodiment. In FIG. 20, the direction perpendicular to the paper surface corresponds to the axial direction A1. When the insulator 71 is attached to the split core 62, the restricting protrusion 74D has an inclined surface 95 at one end of the restricting protrusion 74D in the circumferential direction C1 that is closer to the tooth covering portion 72 when viewed from the axial direction A1. The inclined surface 95 forms an acute angle with respect to the surface of the yoke covering portion 73 from which the restricting protrusion 74D protrudes. The restricting protrusion 74D may also have an inclined portion 93A. The restricting protrusion 74D is not elastically deformed by an external force applied from the second terminal wire 84.

[0109] In this case, when the second terminal wire 84 comes into contact with the inclined surface 95, a reaction force acts on the second terminal wire 84 from the inclined surface 95. This reaction force includes a radially outward component and a circumferential component in a direction from the restricting protrusion 74D toward the teeth 65. Therefore, it becomes more difficult for the second terminal wire 84 to climb over the restricting protrusion 74D in the direction away from the teeth 65 along the circumferential direction C1. As a result, the second terminal wire 84 is more easily held between the coil body 85 and the restricting protrusion 74D. Therefore, it becomes more easy to prevent the coil 81 from collapsing.

[0110] The restriction protrusion 74 does not have to have the inclined portion 93. The position and order in which the winding 82 is arranged on the teeth 65 when winding the coil 81 are not limited to those in the above embodiment. Also, the number of turns of the coil 81 may be changed as appropriate.

[0111] For example, the winding 82 in each coil 81 may be wound around the teeth 65 in the order of reference numbers "1" to "35" shown in Fig. 21. Incidentally, in the example shown in Fig. 21, when the split core 62 is viewed in the base end direction R1, the winding 82 is wound in a counterclockwise direction around the teeth 65. Also, in the example shown in Fig. 21, the parallel wire 86 is a portion of the winding 82 located at the position of reference number "33."

[0112] The shape of the restricting protrusion 74 is not limited to that of the above embodiment, so long as it protrudes from the yoke covering portion 73 in the tip direction R2 when the insulator 71 is attached to the split core 62. In addition, the position of the restricting protrusion 74 on the insulator 71 is not limited to that of the above embodiment, so long as it is adjacent to the coil 81 in the circumferential direction C1 as viewed in the base direction R1.

[0113] The shape of the tooth covering portion 72 is not limited to that of the above embodiment as long as it covers at least a portion of the teeth 65. The shape of the yoke covering portion 73 is not limited to that of the above embodiment as long as it covers at least a portion of the inner surface 63. For example, the yoke covering portion 73 does not have to have the first temporary holding groove 76a and the second temporary holding groove 76b.

[0114] The number of split cores 62 constituting the stator core 61 is not limited to 12, but may be any plural number. The number of coils 81 provided in the stator core 61 may be changed according to the number of split cores 62. [Explanation of symbols]

[0115] 51 stator, 61 stator core, 62 split core, 63 inner surface, 64 back yoke portion, 65 teeth, 67 recess, 71 insulator, 72 teeth covering portion, 73 yoke covering portion, 74, 74A, 74B, 74C, 74D restricting protrusion, 78 elastic piece, 81 coil, 82 winding, 83 first terminal wire, 84 second terminal wire, 86 parallel wire, 92a first end, 92b second end, 93, 93A inclined portion, 95 inclined surface, C1 circumferential direction, D1 outer diameter, F1 force, Fr1 radial component, F2 force, Fr2 radial component, G1 gap, L1 reference axis, R1 direction from tip to base end of teeth (base end direction), R2 direction from base end to tip of teeth (tip direction), Ra1 radius, W Width, W1 first width, W2 second width

Claims

1. an insulator having a back yoke portion (64) having an inner surface (63) and teeth (65) protruding from the inner surface in a direction perpendicular to a reference axis (L1), the insulator being attached to each of a plurality of split cores (62) arranged in an annular shape centered on the reference axis to constitute a stator core (61), and for electrically insulating the split cores from coils (81) wound around the teeth, a tooth covering portion (72) covering at least a portion of the tooth, a yoke covering portion (73) covering at least a portion of the inner surface, and a restricting protrusion (74, 74A, 74B, 74C, 74D) protruding from the yoke covering portion, The regulating protrusion protrudes from the yoke covering portion in a direction (R2) from the base end to the tip end of the tooth when the insulator is attached to the split core, and is positioned adjacent to the coil wound around the tooth via the insulator in the circumferential direction (C1) around the reference axis when viewed in the direction (R1) from the tip to the base end of the tooth.

2. 2. The insulator as described in claim 1, wherein when the insulator is attached to the split core, the end of the regulating protrusion in the circumferential direction when viewed from a direction along the reference axis that is farther from the tooth covering portion is defined as a first end (92a) and the end closer to the tooth covering portion is defined as a second end (92b), and the regulating protrusion has an inclined portion (93, 93A) in an end region including the first end of the regulating protrusion, the amount of protrusion from the yoke covering portion gradually increasing as it approaches the first end toward the second end along the circumferential direction.

3. An insulator as described in claim 1 or claim 2, wherein when viewed from a direction along the reference axis when the insulator is attached to the split core, the regulating protrusion has, at one of both ends of the regulating protrusion in the circumferential direction that is closer to the tooth covering portion, an inclined surface (95) that forms an acute angle with respect to the surface from which the regulating protrusion protrudes in the yoke covering portion.

4. 4. The insulator according to claim 1, wherein the restricting projection has a constant cross-sectional shape perpendicular to the reference axis when the insulator is attached to the split core.

5. An insulator as described in any one of claims 1 to 4, wherein when the insulator is attached to the split core and viewed from a direction along the reference axis, the insulator has a regulating protrusion on both sides of the tooth covering portion in the circumferential direction.

6. a stator core (61) having a plurality of split cores (62), each of which has a back yoke portion (64) having an inner surface (63) and teeth (65) protruding from the inner surface in a direction perpendicular to a reference axis (L1); A plurality of insulators (71) each attached to the split core; A plurality of coils (81) each wound around the teeth via the insulator; A stator comprising: The divided cores are arranged in an annular shape centered on the reference axis, Each of the coils has a first terminal wire (83) which is a winding start end and a second terminal wire (84) which is a winding end end, Each of the insulators has a tooth covering portion (72) covering at least a portion of the tooth, a yoke covering portion (73) covering at least a portion of the inner surface, and a restricting protrusion (74, 74A, 74B, 74C, 74D) protruding from the yoke covering portion in a direction (R2) from a base end toward a tip end of the tooth, The regulating protrusion on each insulator is located adjacent to the coil wound around the tooth in the circumferential direction (C1) around the reference axis when viewed in the direction (R1) from the tip to the base end of the tooth, and is a stator located on the side of both sides of the tooth in the circumferential direction opposite to the side on which the first terminal wire is arranged.

7. The stator according to claim 6 , wherein the restriction projection of each of the insulators has a portion that overlaps with the second terminal wire in the circumferential direction.

8. The winding (82) constituting each of the coils has a circular cross-sectional shape, 8. The stator according to claim 6, wherein the restricting protrusions of the insulators have a protruding height from the yoke covering portion in a direction from a base end to a tip end of the tooth that is greater than a radius (Ra1) of the winding.

9. Each of the coils has a parallel wire (86) arranged adjacent to the second terminal wire in a direction from a base end to a tip end of the tooth, the second terminal wire is located between the yoke covering portion and the parallel wire in a direction from a base end to a tip end of the tooth, 9. The stator according to claim 6, wherein a width (W) of a gap (G1) between the parallel wire and the regulating protrusion, as viewed from a direction along the reference axis, is smaller than an outer diameter (D1) of a winding (82) constituting the coil.

10. 10. The stator according to claim 9, wherein, when the second terminal wire passes between the regulating projection and the parallel wire toward the gap between the yoke covering portion and the parallel wire, the regulating projection is elastically deformed by an external force applied from the second terminal wire from a first state in which the width of the gap between the regulating projection and the parallel wire is a first width (W1) smaller than an outer diameter of the winding as viewed in a direction along the reference axis to a second state in which the width of the gap between the regulating projection and the parallel wire is a second width (W2) larger than the first width as viewed in a direction along the reference axis, and returns to the first state after the second terminal wire passes between the regulating projection and the parallel wire.

11. Each of the split cores has a recess (67) that opens onto the inner surface in a range including a range overlapping with the restricting protrusion when viewed in a direction from the tip end toward the base end of the tooth, the yoke covering portion of each of the insulators has an elastic piece (78) that is elastically deformable in a direction from the tip end to the base end of the tooth at a position overlapping with the recess as viewed in the direction from the tip end to the base end of the tooth, The restricting protrusion protrudes from the elastic piece, 10. The stator according to claim 9, wherein, when the second terminal wire passes between the regulating projection and the parallel wire toward the gap between the yoke covering portion and the parallel wire, an external force from the second terminal wire applied to the elastic piece via the regulating projection elastically deforms from a normal state in which the regulating projection is disposed at a first position where the width of the gap between the regulating projection and the parallel wire is a first width (W1) smaller than an outer diameter of the winding, as viewed in a direction along the reference axis, to a deformed state in which the regulating projection is disposed at a second position where the width of the gap between the regulating projection and the parallel wire is a second width (W2) larger than the first width, as viewed in a direction along the reference axis, and returns to the normal state after the second terminal wire passes between the regulating projection and the parallel wire.

12. 11. The stator described in claim 10, wherein the regulating protrusion on each of the insulators is elastically deformed to extend along the circumferential direction by an external force applied from the second terminal wire when the second terminal wire passes between the regulating protrusion and the parallel wire toward the space between the yoke covering portion and the parallel wire, thereby reducing the protruding height from the yoke covering portion in the direction from the base end to the tip end of the tooth, thereby changing from the first state to the second state.

13. 13. The stator according to claim 6, wherein the second terminal wire contacts the yoke covering portion and presses the yoke covering portion with a force (F1) including an outward radial component (Fr1) perpendicular to the reference axis.

14. A method for manufacturing a stator including a stator core (61) having a plurality of split cores (62), each having a back yoke portion (64) having an inner surface (63) and teeth (65) protruding from the inner surface in a direction perpendicular to a reference axis (L1), a plurality of insulators (71) attached to the split cores, and a plurality of coils (81) wound around each of the teeth via the insulators, Each of the insulators includes a tooth covering portion (72) covering at least a portion of the tooth, a yoke covering portion (73) covering at least a portion of the inner surface, and a restricting protrusion (74) protruding from the yoke covering portion, the restricting projection protrudes from the yoke covering portion in a direction (R2) from the base end toward the tip end of the tooth when the insulator is attached to the split core, and is located at a position adjacent to the coil wound around the tooth in the circumferential direction around the reference axis as viewed in the direction (R1) from the tip end toward the base end of the tooth, a mounting step of mounting the insulator on each of the divided cores; a winding step for winding a wire (82) around each of the teeth after the mounting step to form the coil having a first terminal wire (83) which is a winding start end and a second terminal wire (84) which is a winding end end; a pulling step of pulling the second terminal wire with a force (F2) including an inward radial component (Fr2) perpendicular to the reference axis, the force (F2) being applied to the second terminal wire after the winding step; an arrangement step of arranging the divided cores in an annular shape centered on the reference axis; Equipped with In the winding step, the second terminal wire is disposed between a portion of the coil that is wound around the tooth and the restricting protrusion.

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