JP7632070B2 - Insulator, stator and method for manufacturing the stator - Google Patents

Description

The present invention relates to an insulator, a stator, and a method for manufacturing a stator.

Conventionally, stators provided in motors include, for example, a ring-shaped stator core having multiple split cores, each having teeth, and a coil wound around each tooth, as described in Patent Document 1. The multiple 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 a tooth via the insulator. Each coil has a start-of-winding terminal wire, which is the end where the coil starts winding, and an end-of-winding terminal wire, which is the end where the coil ends winding.

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 the 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 teeth 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 a ring shape. This prevents the terminal wire at the end of the winding from coming off the groove and the coil from collapsing during the process of arranging the multiple split cores in a ring shape. The terminal wire is removed from the groove after the multiple split cores are arranged in a ring shape.

JP 2017-195647 A

As described in Patent Document 1, when the terminal wire is temporarily fixed between the locking projections 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 projections. 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 projections 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 projections and the bottom surface of the groove is performed. This raises concerns that the number of steps required for manufacturing the stator will increase.

The present invention has been made to solve the above problems, and its purpose 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.

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 a ring shape centered on the reference axis and that constitute a stator core (61), and serves to electrically insulate the split cores from coils (81) wound around the teeth, the insulator comprising: a tooth covering portion (72) that covers at least a portion of the teeth; and a yoke covering portion (73) covering the teeth and a regulating protrusion (74, 74A, 74B, 74C, 74D) protruding from the yoke covering portion, wherein the regulating protrusion protrudes from the yoke covering portion in a direction (R2) from the base end to the tip end of the teeth when the insulator is attached to the split core, and is located adjacent to the coil wound around the teeth via the insulator in a circumferential direction (C1) around the reference axis when viewed in a direction (R1) from the tip to the base end of the teeth.

According to the above aspect, when 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 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 method. As a result, the second terminal wire at the end of the coil winding can be held while preventing an increase in the manufacturing process of a stator including the insulator.

The stator that solves the above problem is a stator comprising 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, the plurality of split cores being arranged in a ring shape centered on the reference axis, each of the coils having a first terminal wire (83) which is an end where the winding starts and a second terminal wire (84) which is an end where the winding ends, Each insulator has a tooth covering portion (72) that covers at least a portion of the tooth, a yoke covering portion (73) that covers at least a portion of the inner surface, and a restricting protrusion (74, 74A, 74B, 74C, 74D) that protrudes from the yoke covering portion in a direction (R2) from the base end to the tip end of the tooth, and the restricting 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 the tooth on the opposite side of the side on which the first terminal wire is arranged in the circumferential direction.

According to the above aspect, when 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 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 method. 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.

In addition, in general, in a coil, the second terminal wire is often located on the side of the tooth in the circumferential direction about the reference axis opposite the side on which the first terminal wire is located. 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 on which the second terminal wire is located. 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 it, for example, to the side of the tooth in the circumferential direction about the reference axis on which the first terminal wire is located.

A method for manufacturing a stator that solves the above problem is a method for manufacturing a stator comprising 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) that are respectively attached to the split cores, and a plurality of coils (81) that are respectively wound around the teeth via the insulators, each of the insulators having a tooth 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 a restricting protrusion (74) that protrudes from the yoke covering portion, and the restricting protrusion 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, , when viewed in the direction (R1) from the tip to the base end of the tooth, the insulator is located adjacent to the coil wound around the tooth in the circumferential direction around the reference axis, and the method includes an attachment process for attaching the insulator to each of the split cores, a winding process after the attachment process for winding a winding (82) around each of the teeth to form the coil having a first terminal wire (83) that is the winding start end and a second terminal wire (84) that is the winding end end, a pulling process after 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 the multiple 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 restricting protrusion.

According to the above aspect, when 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 the need for a process of pushing the second terminal wire into a groove to hold it as in the conventional method. As a result, the second terminal wire can be held while preventing an increase in manufacturing man-hours when manufacturing a stator.

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 of the tooth toward the tip end. Therefore, the second terminal wire can be more effectively prevented from moving over the restricting protrusion in the direction away from the tooth.

1 is a schematic diagram of a motor including a stator according to an embodiment; FIG. 4 is a perspective view of an insulator attached to a split core in one embodiment. FIG. 2 is a perspective view of an insulator according to an embodiment. FIG. 2 is a plan view of an insulator according to an embodiment. FIG. 2 is a front view of an insulator according to an embodiment. FIG. 4 is a plan view of a split core around which a coil is wound in one embodiment. FIG. 4 is a plan view showing a part of a split core around which a coil is wound in one embodiment. FIG. 4 is a front view showing a part of a split core around which a coil is wound in one embodiment. FIG. 4 is a plan view showing a part of a split core around which a coil is wound in one embodiment. FIG. 4 is a plan view showing a part of a split core around which a coil is wound in one embodiment. FIG. 11 is a cross-sectional view showing a part of a split core around which a coil is wound in a modified example. FIG. 11 is a cross-sectional view showing a part of a split core around which a coil is wound in a modified example. FIG. 11 is a cross-sectional view showing a part of a split core around which a coil is wound in a modified example. FIG. 11 is a cross-sectional view showing a part of a split core around which a coil is wound in a modified example. FIG. 11 is a plan view of an insulator in a modified example. FIG. 11 is a perspective view showing a portion of an insulator according to a modified example. FIG. 11 is a perspective view showing a portion of an insulator according to a modified example. FIG. 11 is a perspective view showing a portion of an insulator according to a modified example. FIG. 11 is a perspective view showing a portion of an insulator according to a modified example. FIG. 11 is a plan view showing a part of a split core around which a coil is wound in a modified example. FIG. 11 is a plan view of a split core around which a coil is wound in a modified example.

Below, an embodiment of an insulator, a stator, and a stator manufacturing method will be described. Note that the attached drawings may show components enlarged to facilitate understanding. The dimensional ratios of the components in the attached drawings may differ from the actual ones or from those in other drawings.

As shown in FIG. 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.

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

As shown in Figures 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 the 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".

The multiple split cores 62 constituting the stator core 61 are arranged in a ring 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 a ring 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 lined up 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 radially outer end of each tooth 65.

(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.

As shown in Figures 2 to 5, each insulator 71 includes a tooth covering portion 72 that covers at least a portion of the teeth 65, a yoke covering portion 73 that covers at least a portion of the inner surface 63, and a restricting protrusion 74 that protrudes from the yoke covering portion 73. The tooth covering portion 72, the yoke covering portion 73, and the restricting protrusion 74 are integrally molded.

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

In each insulator 71, the yoke covering portion 73 covers a portion of the inner surface 63 of the back yoke portion 64. The yoke covering portion 73 extends, for example, from the base end of the tooth covering portion 72, i.e., from the 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.

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

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 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.

As shown in Figures 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 shape.

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.

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. Note that the reference axis L1 is only shown in FIG. 1, and is not shown in FIG. 6. In addition, the axial direction A1 in FIG. 6 corresponds to the direction perpendicular to the paper surface. In addition, hatching indicating that the coil 81 is a cross section is omitted in FIG. 6. In addition, 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". In addition, when the split core 62 is viewed in the direction from the tip to the base end of the teeth 65, the winding 82 is wound counterclockwise around the teeth 65. Note that hereinafter, the direction from the tip to the base end of the teeth 65 is referred to as the base end direction R1.

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 of the tooth 65 in the circumferential direction C1 to the side on which the first terminal wire 83 is disposed. That is, the tooth 65 may be disposed 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.

Each coil 81 may have a parallel wire 86 that is aligned adjacent to the second terminal wire 84 in the direction from the base end to the tip end of the tooth 65. In the following, the direction from the base end to the tip end of the tooth 65 is referred to as the tip direction R2. The parallel wire 86 is aligned, for example, radially with 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.

As shown in Figures 2 to 8, the restricting protrusion 74 on 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. Furthermore, the restricting protrusion 74 on 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. On 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.

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

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.

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 from 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 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. Each reduced portion 91 has, for example, 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 is spherical. 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.

Here, when the insulator 71 is attached to the split core 62, the end of the restricting protrusion 74 in the circumferential direction C1 as viewed from the axial direction A1 that is farther from the tooth covering portion 72 is defined as the first end 92a, and the end closer to the tooth covering portion 72 is defined as the 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, in which the amount of protrusion from the yoke covering portion 73 gradually increases as the protrusion 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.

As shown in FIG. 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.

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 width that allows the second terminal wire 84, which is 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.

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. Note that the reference axis L1 is not shown in FIG. 9, but the direction perpendicular to the paper surface in FIG. 9 is a direction parallel to the reference axis L1. The "outward" 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, the radially inner surface 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 protrusion 74 from the circumferential direction C1. For example, the second terminal wire 84 presses both the yoke covering portion 73 and the restricting protrusion 74 with a force F1.

(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.

After the mounting process, a winding process 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 process is performed, for example, after the mounting process. In the winding process, the winding 82 is wound around the teeth 65 via the insulator 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.

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. The winding machine then forms the 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. The winding machine then places the winding 82 at position of reference number "35", i.e. places the second terminal wire 84.

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 forming the coil body 85. That is, the second terminal wire 84 passes through the gap G1 between the restricting protrusion 74 and the parallel wire 86 toward the space 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 between the part 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 positioned at position "35", the winding of the coil 81 is completed.

When the winding process is completed, the coils 81 are wound around the teeth 65 of each of the multiple split cores 62. In each coil 81, the first terminal wire 83 and the second terminal wire 84 are pulled out to one side in the axial direction A1.

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" in the inward radial component Fr2 perpendicular to the reference axis L1 is the 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 part of the second terminal wire 84 that protrudes to one side in the axial direction A1 from the coil body 85. The force F2 may include a circumferential component Fc2 in addition to the radial component Fr2. The circumferential component Fc2 is a component in the 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.

When the second terminal wire 84 is pulled by applying 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 force F2 to the second terminal wire 84 is stopped. This ends the pulling process.

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 a force F1. Furthermore, the second terminal wire 84 may press the restricting protrusion 74 due to the same 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. 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 that overlaps with the second terminal wire 84 in the circumferential direction C1.

In addition, an arrangement process is performed in which the multiple split cores 62 are arranged in a ring shape centered on the reference axis L1. The arrangement process is performed, for example, after the pulling process. When the arrangement process 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.

In the arrangement process, for example, 12 split cores 62 are arranged in the circumferential direction C1 so that the back yoke portion 64 of each split core 62 forms an annular shape as a whole. At this time, each split core 62 is arranged so that the teeth 65 of each split core 62 protrude radially inward from the back yoke portion 64. When the arrangement process is completed, an annular stator core 61 made up of multiple split cores 62 is completed.

As described above, the stator 51 is completed by performing the mounting process, winding process, pulling process, and arrangement process. 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.

(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 tension applied to the winding 82 by the winding machine makes it possible to position the second terminal wire 84 between the coil body 85 and the restricting protrusion 74. Therefore, the processes of positioning the first terminal wire 83 on the tooth 65, winding the coil body 85, and further positioning the second terminal wire 84 between the coil body 85 and the restricting protrusion 74 can be continuously performed by the winding machine.

The second terminal wire 84 can be arranged 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 the movement of the second terminal wire 84 in the direction away from the teeth 65 along the circumferential direction C1. For example, if the second terminal wire 84 attempts 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 prevents the second terminal wire 84 from moving 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.

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 a plurality of split cores 62 arranged in a ring shape centered on the reference axis L1 to constitute 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.

According to the above aspect, when 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 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 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 cause the second terminal wire 84 to be arranged between the coil body 85 and the restricting protrusion 74. The second terminal wire 84 arranged between the coil body 85 and the restricting protrusion 74 is prevented from moving away from the coil body 85 by the restricting protrusion 74. 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 as in the conventional method. As a result, the second terminal wire 84 can be held while suppressing an increase in the number of manufacturing steps required to manufacture the stator 51.

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 multiple split cores 62 are arranged in a ring 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 a ring shape. This makes it easier to perform the process of arranging the split cores 62 in a ring 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 improve the productivity of the stator 51 equipped with the insulator 71.

In addition, 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 equipped with the stator 51 vibrates, the coil 81 can be prevented from collapsing.

(2) When the insulator 71 is attached to the split core 62, the end of the regulating protrusion 74 in the circumferential direction C1 as viewed from the direction along the reference axis L1 that is farther from the tooth covering portion 72 is designated as the first end 92a, and the end closer to the tooth covering portion 72 is designated as the second end 92b. The regulating protrusion 74 has an inclined portion 93 in the end region including the first end 92a of the regulating protrusion 74, whose protrusion from the yoke covering portion 73 gradually increases as it approaches the second end 92b from the first end 92a along the circumferential direction C1.

According to the above aspect, when winding the coil 81 around the teeth 65, the winding 82 wound around the teeth 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 teeth 65.

(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 aspect, when manufacturing the insulator 71 by resin molding, the insulator 71 having the restricting protrusion 74 can be manufactured by using two molding dies that are divided in the direction along the reference axis L1. That is, the insulator 71 having the restricting protrusion 74 can be manufactured without using a complex molding die such as a slide die. Therefore, a decrease in the productivity of the insulator 71 can be suppressed. Also, an increase in the manufacturing cost of the insulator 71 can be suppressed.

In this embodiment, the regulating 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 regulating protrusion 74 has a constant cross-sectional shape perpendicular to the axial direction A1. The reduced portion 91 protrudes less in the tip direction R2 as it moves away from the center of the regulating protrusion 74 in the axial direction A1 along the axial direction A1. The reduced portion 91 also gradually narrows in width in the circumferential direction C1 as it moves away from the center of the regulating protrusion 74 in the axial direction A1 along the axial direction A1. Furthermore, the reduced portion 91 gradually reduces in cross-sectional area perpendicular to the reference axis L1 as it moves away from the center of the regulating 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 moving relatively away from each other along the reference axis L1. Therefore, even if the restricting protrusion 74 has a reduced portion 91, the insulator 71 can be manufactured using two molding dies that are split in the direction along the reference axis L1.

(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 plurality of split cores 62 are arranged in a ring shape centered on the reference axis L1. Each of the coils 81 has a first terminal wire 83, which is the end where the winding starts, and a second terminal wire 84, which is the end where the winding ends. Each of the insulators 71 has a tooth covering portion 72 that covers at least a portion of the teeth 65, a yoke covering portion 73 that covers at least a portion of the inner surface 63, and a restricting protrusion 74 that protrudes from the yoke covering portion 73 in the tip direction R2. The restricting protrusion 74 on 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. Also, the restricting protrusion 74 on each insulator 71 is located on the opposite side of the tooth 65 in the circumferential direction C1 from the side on which the first terminal wire 83 is arranged.

In general, in the coil 81, the second terminal wire 84 is often located on the side of the teeth 65 in the circumferential direction C1 opposite to the side on which the first terminal wire 83 is located. Therefore, according to the above embodiment, the restricting protrusion 74 is likely to be located on the side of the teeth 65 in the circumferential direction C1 on which the second terminal wire 84 is located. Therefore, when winding the coil 81, after winding the coil body 85, the second terminal wire 84 can be easily held between the coil body 85 and the restricting protrusion 74 without having to move it, for example, to the side of the teeth 65 in the circumferential direction C1 on which the first terminal wire 83 is located.

(5) The restricting protrusion 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.

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

According to the above aspect, 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, it is more easily possible to prevent the coil 81 from collapsing.

(7) Each of the coils 81 has a parallel wire 86 that is adjacent to the second terminal wire 84 in the tip direction R2. The second terminal wire 84 is located between the yoke covering portion 73 and the parallel wire 86 in the tip direction R2. 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 that constitutes the coil 81.

According to the above aspect, the parallel wire 86 restricts movement of the second terminal wire 84 in the tip direction R2. In addition, 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. Therefore, the second terminal wire 84 can be restricted from moving through the gap G1 in a direction away from the teeth 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 74. As a result, collapse of the coil 81 can be further restricted.

(8) The second terminal wire 84 is in contact with the yoke covering portion 73 and presses against 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 aspect, 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 more effectively prevented from moving over the restricting protrusion 74 in the direction away from the teeth 65.

(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 the 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 that covers at least a portion of the teeth 65, a yoke covering portion 73 that covers at least a portion of the inner surface 63, and a restricting protrusion 74 that protrudes 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 teeth 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 the 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.

According to the above aspect, when 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, 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 body 85 and the restricting protrusion 74. The second terminal wire 84 arranged between the coil body 85 and the restricting protrusion 74 is prevented from moving away from the coil 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 it as in the conventional case. From these points of view, the second terminal wire 84 can be held while suppressing an increase in the manufacturing man-hours when manufacturing the stator 51.

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 more 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.

(10) The regulating protrusion 74 has a reduced portion 91 at each end region on 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 regulating protrusion 74 in the axial direction A1 along the axial direction A1. The reduced portion 91 also gradually narrows in width in the circumferential direction C1 as it moves away from the center of the regulating protrusion 74 in the axial direction A1 along the axial direction A1. Furthermore, the reduced portion 91 gradually reduces in cross-sectional area perpendicular to the reference axis L1 as it moves away from the center of the regulating protrusion 74 in the axial direction A1 along the axial direction A1.

According to the above aspect, when winding the coil 81 around the teeth 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 caused 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 caused by the restricting protrusion 74 can be further suppressed.

This embodiment can be modified as follows. This embodiment and the following modified examples can be combined to the extent that there is no technical contradiction. In the figures used to explain the modified examples below, the same reference numerals are used to designate the same components as in this embodiment and corresponding components.

- 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.

The second terminal wire 84 does not have to press against the yoke covering portion 73 with a force F1 including a radial component Fr1. Furthermore, the second terminal wire 84 does not have to be in contact with 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 process.

- As shown in FIG. 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, for example, so that the tip of the restricting protrusion 74A moves radially outward and approaches the radially inner surface of the yoke covering portion 73.

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 from the axial direction A1 is 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 from the axial direction A1 is 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.

When the coil 81 is wound around the teeth 65, after the parallel wire 86 is arranged and before the second terminal wire 84 is arranged between the teeth 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 contacts the restricting protrusion 74A and pushes the restricting protrusion 74A toward the space between the yoke covering portion 73 and the parallel wire 86. In addition, in FIG. 11, the second terminal wire 84 is illustrated by a two-dot chain line while 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. 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 positioned between the coil body 85 and the restricting protrusion 74A as viewed in the base end direction R1.

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.

In addition, when the second terminal wire 84 passes between the restricting protrusion 74A and the parallel wire 86 toward the area between the yoke covering portion 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, there is no need to add a separate process to change the restricting protrusion 74A from the first state to the second state.

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 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. In this way, the same effect as that of (2) in the above embodiment can be achieved.

In addition, the restricting protrusion 74A may have an inclined surface 95 at the end of the restricting protrusion 74A closer to 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. The inclined surface 95 forms an acute angle with respect to the surface from which the restricting protrusion 74A protrudes in the yoke covering portion 73. 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 overcome 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 easier to prevent the coil 81 from collapsing.

- As shown in FIG. 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 split cores 62 has a recess 67 that opens to the inner surface 63, for example, in a range that includes a range that overlaps with the restricting protrusion 74B when viewed in the base end direction R1. That is, the recess 67 is in a range that includes a range that overlaps with the restricting protrusion 74B in the radial direction in the back yoke part 64. And, the yoke covering part 73 in 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 that overlaps 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 direction R2.

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, in which the amount of protrusion from the yoke covering portion 73 gradually increases as the protrusion approaches the second end 92b from the first end 92a along the circumferential direction C1. When the restricting protrusion 74B has the inclined portion 93A, the same effect as that of the above embodiment (2) can be achieved. 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.

The elastic piece 78 extends, for example, from the base end to the tip end of the elastic piece 78 along the circumferential direction C1. For example, the tip end of the elastic piece 78 is located farther away from the teeth 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.

The elastic piece 78 can be elastically deformed 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 can be elastically deformed 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 can 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. When the elastic piece 78 is elastically deformed as described above when 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, by the part of the elastic piece 78 including the tip of the elastic piece 78 entering the recess 67, 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.

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. 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, 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 by elastic deformation. 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.

When the coil 81 is wound around the teeth 65, after the parallel wire 86 is arranged and before the second terminal wire 84 is arranged between the teeth 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 contacts 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 shown 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 positioned between the coil body 85 and the restricting protrusion 74B as viewed in the base end direction R1.

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.

In addition, when the second terminal wire 84 passes between the restricting protrusion 74B and the parallel wire 86 toward the area between the yoke covering portion 73 and the parallel wire 86, the force with which the second terminal wire 84 elastically deforms the elastic piece 78 from the normal state to the deformed state is due to the tension applied to the winding 82 by the winding machine. Therefore, there is no need to add a separate process to change the elastic piece 78 from the normal state to the deformed state.

Note that the shape of the restricting protrusion 74B in the example shown in FIG. 12 is not limited to this. For example, the insulator 71 may have the restricting protrusion 74 of the above embodiment at the tip of the elastic piece 78.

- 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 (2) of the above embodiment can be achieved.

The restricting protrusion 74C elastically deforms so as 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. As a result of the protruding height of the restricting protrusion 74C from the yoke covering portion 73 in the tip direction R2 decreasing, the width W between the parallel line 86 and the restricting protrusion 74C increases.

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 from the axial direction A1 is a first width W1 that is smaller than the outer diameter D1 of the winding 82. Note that 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 elastically deformed to 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 from the axial direction A1 is a second width W2 that is larger than the first width W1. Note that in FIG. 13, the restricting protrusion 74C in the second state is illustrated by a two-dot chain line.

When the coil 81 is wound around the tooth 65, after the parallel wire 86 is arranged, but 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. Then, when the second terminal wire 84 passes between the restricting protrusion 74C and the parallel wire 86 toward the area between the yoke covering part 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 part 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 external force applied from the second terminal wire 84 elastically deforms the restricting protrusion 74C so as to extend in the circumferential direction C1, thereby decreasing the protruding height from the yoke covering part 73 in the tip direction R2. This causes the restricting protrusion 74C to change 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 positioned between the coil body 85 and the restricting protrusion 74C as viewed in the base direction R1.

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.

The restricting protrusion 74C also 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 to allow the elastic deformation of the restricting protrusion 74C. This prevents the shape of the split core 62 from becoming complicated, while preventing the second terminal wire 84 from moving through the gap G1 in a direction away from the teeth 65.

In addition, when the second terminal wire 84 passes between the restricting protrusion 74C and the parallel wire 86 toward the area between the yoke covering portion 73 and the parallel wire 86, the force with which the second terminal wire 84 elastically deforms the restricting protrusion 74C from the first state to the second state is due to the tension applied to the winding 82 by the winding machine. Therefore, there is no need to add a separate process to change the restricting protrusion 74C from the first state to the second state.

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. Also, in FIG. 14, the second terminal wire 84 is illustrated by a two-dot chain line in the middle of passing between the restricting protrusion 74C and the parallel wire 86 toward the space between the yoke covering portion 73 and the parallel wire 86. This can also produce the same effect as the example shown in FIG. 13.

- 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 greater than the outer diameter D1 of the winding 82.

Each of the coils 81 does not have to have the parallel wires 86 .
The restricting protrusions 74 of each insulator 71 may have a protruding height from the yoke covering portion 73 in the forward direction R2 that is equal to or smaller than the radius Ra1 of the winding 82. Also, the restricting protrusions 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, for example.

- As shown in FIG. 15, the insulator 71 may have a restricting protrusion 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 teeth covering portion 72 in the circumferential direction C1 the second terminal wire 84 is arranged on, the second terminal wire 84 can be easily held between the restricting protrusion 74 and the coil body 85.

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 have to have the reduced portion 91 .

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 cross section of the restriction protrusion 74 perpendicular to the reference axis L1 may be rectangular.

Also, for example, as shown in FIG. 18, a restricting protrusion 74 may have a triangular cross section perpendicular to the reference axis L1.
Also, for example, the restricting protrusion 74 may have a trapezoidal cross-sectional shape perpendicular to the reference axis L1. Also, for example, the restricting protrusion 74 may have a polygonal shape other than a square or a triangle cross-sectional shape perpendicular to the reference axis L1. Also, for example, the restricting 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.

For example, as shown in FIG. 19, the cross-sectional shape of the restricting protrusion 74 perpendicular to the reference axis L1 does not have to be constant along the axial direction A1. The restricting protrusion 74 shown in FIG. 19 is semispherical.

- 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 of both ends 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.

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 the direction from the restricting protrusion 74D toward the tooth 65. Therefore, it becomes more difficult for the second terminal wire 84 to overcome the restricting protrusion 74D 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 74D. Therefore, it becomes easier to prevent the coil 81 from collapsing.

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 the position and order in the above embodiment. The number of turns of the coil 81 may be changed as appropriate.

For example, the windings 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. In the example shown in FIG. 21, when the split core 62 is viewed in the base end direction R1, the windings 82 are wound counterclockwise around the teeth 65. Also, in the example shown in FIG. 21, the parallel wire 86 is the portion of the winding 82 located at the position of reference number "33."

- 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 when viewed in the base direction R1.

- The shape of the tooth covering portion 72 is not limited to that of the above embodiment, so 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, so 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.

The number of split cores 62 that make up the stator core 61 is not limited to 12, but may be any number greater than one. The number of coils 81 provided in the stator core 61 may be changed according to the number of split cores 62.

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 (14)

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. The insulator according to claim 1, in which when the insulator is attached to the split core, the end of the regulating protrusion in the circumferential direction, as viewed from the 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), 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 the insulator approaches the second end from the first end along the circumferential direction. The insulator according to claim 1 or 2, wherein the restricting protrusion has an inclined surface (95) that forms an acute angle with respect to the surface of the yoke covering portion from which the restricting protrusion protrudes, at one of the two ends of the restricting protrusion in the circumferential direction that is closer to the tooth covering portion when viewed from the direction along the reference axis when the insulator is attached to the split core. An insulator according to any one of claims 1 to 3, wherein the restricting protrusion has a constant cross-sectional shape perpendicular to the reference axis when the insulator is attached to the split core. The insulator according to 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 restricting protrusions are provided on both sides of the teeth covering portion in the circumferential direction. 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 stator including a plurality of coils (81) wound around each of the teeth via the insulator,
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. The stator according to claim 6, wherein the restricting protrusion on each of the insulators has a portion that overlaps with the second terminal wire in the circumferential direction. 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. 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. The stator according to claim 9, wherein when the second terminal wire passes between the restricting protrusion and the parallel wire toward the gap between the yoke covering portion and the parallel wire, the restricting protrusion 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 restricting protrusion and the parallel wire is a first width (W1) smaller than the outer diameter of the winding as viewed along the reference axis to a second state in which the width of the gap between the restricting protrusion and the parallel wire is a second width (W2) larger than the first width as viewed along the reference axis, and returns to the first state after the second terminal wire passes between the restricting protrusion and the parallel wire. 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. The stator according to claim 10, wherein the restricting protrusions on each of the insulators are elastically deformed to extend in the circumferential direction by an external force applied from the second terminal wire when the second terminal wire passes between the restricting protrusion and the parallel wire toward the gap between the yoke covering portion and the parallel wire, thereby decreasing 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. A stator according to any one of claims 6 to 12, 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. 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;
and arranging the divided cores in an annular shape centered on the reference axis.
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.