CN112583172B

CN112583172B - Stator and motor

Info

Publication number: CN112583172B
Application number: CN202011039110.0A
Authority: CN
Inventors: 大西达也; 小川幸祐; 安藤博典
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2019-09-30
Filing date: 2020-09-28
Publication date: 2024-05-28
Anticipated expiration: 2040-09-28
Also published as: JP2021057986A; CN112583172A

Abstract

The invention provides a stator and a motor, wherein the stator takes the shape of a ring taking a central axis as a center. The stator is provided with: a tooth extending in a radial direction relative to the central axis; an insulating member mounted to the teeth; and a coil formed of a wire wound around the insulating member, the coil including: a first coil portion that is in contact with the insulating member; and a second coil portion crossing the first coil portion, the first coil portion being sandwiched between the second coil portion and the insulating member.

Description

Stator and motor

Technical Field

The present invention relates to a stator and a motor.

Background

The teeth of the stator mounted on the motor are wound with a wire through an insulator. Japanese patent application laid-open No. 2008-306810 describes a motor including, in order to prevent a winding of teeth wound around a stator: an inclined portion which concentrates across a plurality of winding turns directly below; and an intersecting portion that intersects the oblique turns forming the oblique portion so as to be pressed from above on the same surface as the surface on which the oblique portion is formed.

Patent document 1: japanese patent application laid-open No. 2008-306810

However, in the case of japanese patent application laid-open No. 2008-306810, the turn located at the uppermost layer is the oblique turn. Therefore, it is difficult to fix the winding that is in contact with the insulator and is relatively close to the winding start end, and thus it is difficult to suppress the positional deviation.

Disclosure of Invention

The present invention provides a technique for easily suppressing positional displacement of a coil portion in contact with an insulating member.

In order to solve the above problems, the stator of the present invention is an annular stator centered on a central axis, and includes: a tooth extending in a radial direction relative to the central axis; an insulating member mounted to the teeth; and a coil formed of a wire wound around the insulating member, the coil including: a first coil portion that is in contact with the insulating member; and a second coil portion crossing the first coil portion, the first coil portion being sandwiched between the second coil portion and the insulating member.

The stator of the present structure can fix the first coil portion of the coil, which is in contact with the insulating member, by the second coil portion. In this way, in the stator, the positional displacement of the wire in contact with the insulating member can be suppressed.

Drawings

Fig. 1 is a longitudinal sectional view of a motor of an embodiment.

Fig. 2 is a perspective view of the stator and the first bus bar of the embodiment.

Fig. 3 is a diagram showing a part of the stator core according to the embodiment.

Fig. 4 is a cross-sectional view showing the teeth and insulator of the embodiment.

Fig. 5 is a diagram showing a part of the coil as viewed from the axial direction.

Fig. 6 is a diagram showing a part of the coil as seen from the axial lower side.

Description of the reference numerals

10: A motor; 20: a rotor; 30: a stator; 31: a stator core; 33: teeth; 34: a coil; 341: a first coil portion; 342: a second coil part; 343: a third coil part; 344: a fourth coil portion; 34a: a coil outgoing line; 40: an insulating member; 41: a cylinder portion; 411: a groove portion; 43: a coil holding section; j: a central axis; w1 to W16: and (5) conducting wires.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The constituent elements described in this embodiment are merely examples, and are not intended to limit the scope of the present invention.

The Z-axis direction shown in each figure is a vertical direction with the positive side as the upper side and the negative side as the lower side. The central axis J shown in each figure is a virtual line extending in the vertical direction in parallel with the Z-axis direction. In the following description, the direction parallel to the axial direction of the central axis J, that is, the up-down direction is referred to as the "axial direction", the radial direction centered on the central axis J is referred to as the "radial direction", and the circumferential direction centered on the central axis J is referred to as the "circumferential direction". In each figure, the circumferential direction is indicated by an arrow θ. The radially outer side corresponds to one side in the radial direction and the radially inner side corresponds to the other side in the radial direction.

In the following description, the positive side in the Z-axis direction is set as the upper side, and the negative side in the Z-axis direction is set as the lower side. The upper side corresponds to one axial side, and the lower side corresponds to the other axial side. When viewed toward the lower side, one side advancing in the counterclockwise direction in the circumferential direction (i.e., the side advancing in the direction of the arrow θ) is taken as one circumferential side, and the one side advancing in the clockwise direction is taken as the other circumferential side.

The vertical direction, the upper side, and the lower side are terms for explaining the relative positional relationship of the respective parts, and the actual positional relationship may be other positional relationship.

< 1. Embodiment >

Fig. 1 is a longitudinal sectional view of a motor 10 according to an embodiment. Fig. 2 is a perspective view of the stator 30 and the primary bus bar 100 of the embodiment. The motor 10 includes a housing 11, a rotor 20, a stator 30, an insulator 40, a bearing holder 50, a bus bar holder 60, a second bus bar 70, a control device 80, and a bus bar unit 90. The bus bar unit 90 has a bus bar holder 60 and a second bus bar 70. The housing 11 houses various parts of the motor 10. The housing 11 has a bottomed cylindrical shape centered on the central axis J, and holds the bearing 51 at the bottom center of the lower side.

Rotor 20 includes shaft 21, rotor core 22, and a plurality of magnets 23. The shaft 21 is positioned along the central axis J. The shaft 21 is rotatably supported by bearings 51 and 52. The rotor core 22 is an annular member fixed to the outer peripheral surface of the shaft 21. The plurality of magnets 23 are fixed to the outer peripheral surface of the rotor core 22 via an adhesive, for example. The rotor core 22 and the magnet 23 are disposed radially inward of the stator 30 and rotate together with the shaft 21. The bearing 51 rotatably supports the shaft 21 below the rotor core 22. The bearing 52 rotatably supports the shaft 21 above the rotor core 22. The bearings 51, 52 are, for example, ball bearings. Instead of the ball bearing, a bearing of another type such as a slide bearing or a fluid bearing may be used.

The inner peripheral surface of the stator 30 faces the magnets 23 of the rotor 20 with a gap therebetween in the radial direction. The stator 30 is located radially outside the rotor 20 and surrounds the rotor 20. The radially outer surface of the magnet 23 is a magnetic pole surface facing the radially inner end surface of the tooth 33. The plurality of magnets 23 are circumferentially arranged such that N poles and S poles are alternately arranged in the circumferential direction.

The stator 30 has a stator core 31, a plurality of (twelve in this example) coils 34, and an insulator 40. The stator core 31 has a core back 32 and a plurality of (twelve in this example) teeth 33. As shown in fig. 2, the core back 32 has a cylindrical shape centered on the central axis J. A plurality of teeth 33 extend radially inward from a radially inward facing surface of the core back 32. The plurality of teeth 33 are positioned at equal intervals throughout the circumference in the circumferential direction.

Fig. 3 is a diagram showing a part of stator core 31 according to the embodiment. Fig. 4 is a cross-sectional view showing the teeth 33 and the insulator 40 of the embodiment. As shown in fig. 3 and 4, the teeth 33 have a tooth body 331 and an umbrella 333. The tooth body 331 is a portion extending radially inward from a radially inner side surface of the core back 32. The umbrella 333 is a portion protruding from the radially inner end of the tooth body 331 to both sides in the circumferential direction.

The plurality of coils 34 are mounted on the plurality of teeth 33 via insulators 40. The coil 34 is formed by winding a wire of copper or the like around the teeth 33 via an insulator 40.

As shown in fig. 3, the coil 34 is formed by winding a wire into a rectangular frame shape with rounded corners. In fig. 3, the teeth 33 and the insulation 40 are shown in a cross-section. The coil 34 is wound around the cylindrical portion 41 of the insulator 40 in a clockwise direction when viewed from the radially inner side toward the radially outer side.

The numbers "1" to "16" marked on the wires of the coil 34 shown in fig. 3 and 4 indicate the ordinal numbers of the turns of the wires with respect to the insulator 40. For example, "1" means a first turn and "2" means a second turn. In the following description, "n" is a natural number, and each wire constituting the coil 34 is referred to as "n-th turn wire". Further, the n-th turn of the wire is referred to as "wire Wn". The coil 34 of the present example is constituted by the first turn wire W1 to the sixteenth turn wire W16, but the number of turns of the coil is not limited thereto.

In fig. 3, the direction of the wiring of the coil 34 (i.e., the direction of the coil 34 from the winding start end side toward the winding end side of the wire) is indicated by an arrow. The coil 34 is wound around the cylindrical portion 41 of the insulator 40 in a clockwise direction when viewed from the radially inner side toward the outer side. More specifically, the first turn wire W1 starts to be wound from the upper side toward the lower side of the cylindrical portion 41 on the other side (right side in fig. 3) in the circumferential direction of the cylindrical portion 41. Regarding the wires W2 to W16 subsequent to the wire W1, the other circumferential side of the tube 41 becomes a portion where winding starts. The lead wire Wn extends downward on the other axial side of the tube 41, and then extends downward on the lower side of the tube 41 toward one circumferential side. Then, the lead wire Wn extends upward on one side (left side in fig. 3) in the circumferential direction of the tube 41, and then extends upward on the other side in the circumferential direction of the tube 41. Thereby, the lead wire of the coil 34 surrounds the circumference of the tube 41.

The outermost wire wound around the outermost circumference among the wires constituting the coil 34 is the outermost circumference wire 34e. The outer diameter of the coil 34 is greatest at the outermost Zhou Daoxian e (the wire W16 in this example). The outermost Zhou Daoxian e is a portion of the coil 34 located near the radially outer side. The outermost Zhou Daoxian e is disposed radially inward of the radially outer end of the coil 34. The outermost Zhou Daoxian e has a rectangular frame shape with rounded corners when viewed from the radially inner side toward the radially outer side.

The wires W1 to W7 (except the wire W3) in the coil 34 are wound around the tube 41 so as to be gradually shifted in position from the radially inner side toward the outer side. The wires W8 to W12 are wound around the tube 41 so as to gradually shift in position from the radially outer side toward the inner side. The wires W13 to W16 are wound around the tube 41 so as to be shifted in position in order from the radially inner side to the radially outer side.

The coil lead wires 34a, 34b are led upward from the coil 34. The coil lead wires 34a and 34b are wires extending upward from the coil 34, and are end portions of the wires constituting the coil 34. The coil lead wire 34a is an end portion on the winding start side of the wire, and the coil lead wire 34b is an end portion on the winding end side of the wire. The coil outgoing line 34a is electrically connected to the second bus bar 70. The coil outgoing line 34b is electrically connected to the first bus bar 100.

As shown in fig. 2 to 4, the insulator 40 is attached to the stator core 31. As shown in fig. 2, the insulator 40 is a holding member that holds the primary bus bar 100. The insulator 40 has a plurality of insulating sheets 40P. The plurality of insulating sheets 40P are arranged in the circumferential direction and attached to the respective teeth 33. The plurality of insulating sheets 40P are, for example, separate members from each other. The shapes of the plurality of insulating sheets 40P are identical to each other. The insulating sheet 40P is formed by, for example, axially connecting two separate members.

The insulating sheet 40P includes a cylindrical portion 41, an inner protruding portion 42, a coil holding portion 43 (see fig. 2), an outer protruding portion 44, a bus bar holding portion 45 (see fig. 2), and a pressing portion 48 (see fig. 2).

As shown in fig. 3 and 4, the cylindrical portion 41 is rectangular cylindrical extending in the radial direction. The tooth body 331 is inserted through the inside of the cylinder 41. The coil 34 is wound around the outer periphery of the tube 41. Thereby, the coil 34 is mounted to the tube 41. The inner protruding portion 42 is disposed above the umbrella 333. The cylindrical portion 41 may not cover a part of the outer peripheral surface of the tooth 33. For example, a gap is provided between the two separate members constituting the insulating sheet 40P, and the outer peripheral surfaces of the teeth 33 are exposed through the gap.

As shown in fig. 2, the coil holding portion 43 extends upward from the other circumferential side portion of the inner protruding portion 42. The coil holding portion 43 extends upward from the end portion of the other circumferential side of the inner protruding portion 42. Thereby, the coil holding portion 43 is connected to the radially inner end of the tube 41 via the inner protruding portion 42, and protrudes upward from the tube 41. The coil holding portion 43 has a substantially quadrangular prism shape. The circumferential dimension of the coil holding portion 43 decreases from the lower side toward the upper side. The coil holding portion 43 may extend upward from a portion of the inner protruding portion 42 on one side in the circumferential direction. The coil holding portion 43 may extend upward from one end portion of the inner protruding portion 42 in the circumferential direction.

The coil holding portion 43 has a holding groove portion 43a. The holding groove portion 43a is recessed from a radially outer side surface of the coil holding portion 43 toward a radially inner side, and extends in the axial direction. The inner edge of the holding groove 43a is arcuate in cross section perpendicular to the axial direction. The coil lead wire 34a is held in the holding groove 43a.

As shown in fig. 4, the tube 41 has a plurality of slots 411 in the outer peripheral portion. In this example, a plurality of groove portions 411 are provided on the outer surfaces of one side and the other side in the circumferential direction of the tube portion 41. The plurality of slots 411 are provided at the positions of the wires W1 to W8 contacting the tube 41. Each slot 411 is a recess extending in the axial direction, and guides winding of the lead wires (specifically, the lead wires W1 to W8) of the coil 34 in contact with the tube 41. The slot 411 may be provided on the upper and lower surfaces of the tube 41.

In the motor 10, when a driving current is applied to the coil 34 of the stator 30, each tooth 33 of the stator core 31 generates a radial magnetic flux. Further, a circumferential torque is generated by the action of the magnetic flux between the teeth 33 and the magnet 23. As a result, the rotor 20 rotates about the central axis J with respect to the stator 30.

Fig. 5 is a diagram showing a part of the coil 34 as viewed from the axial direction upper side. Fig. 6 is a diagram showing a part of the coil 34 as seen from the axial lower side. In fig. 5 and 6, the wires W1 to W7 in the coil 34 are shown with solid lines.

The coil 34 has a first coil portion 341, a second coil portion 342, a third coil portion 343, and a fourth coil portion 344. The first coil portion 341 includes first-layer wires W1, W2 that are in contact with the cylindrical portion 41 of the insulator 40. The wire W2 is located radially outward (radially one side) of the wire W1. The second coil portion 342 includes a wire W3. The third coil portion 343 includes first-layer wires W4, W5 in contact with the insulator 40. The fourth coil portion 344 includes second-layer wires W11, W12, W13 that are not in contact with the insulator 40 and are in contact with the outer sides of the first-layer wires W1, W2. The wires W11, W12, W13 are located outside the first layer wires W1 to W7.

As shown in fig. 5, the wire W2 of the first coil portion 341 crosses the wire W1 of the first coil portion 341 radially inward on the upper side of the cylindrical portion 41. As shown in fig. 6, the wire W3 of the second coil portion 342 crosses the wire W2 of the first coil portion 341 radially outward from the wire W1 side on the lower side of the cylindrical portion 41. As shown in fig. 6, the wire W2 of the first coil portion 341 is sandwiched between the tube portion 41 and the wire W3 (the second coil portion 342) at the lower side of the tube portion 41. Thereby, the wire W2 is pressed by the wire W3, and is firmly pressed against the cylindrical portion 41.

The wire W3 of the second coil part 342 is in contact with the wire W1 and the wire W2 of the first coil part 341. As shown in fig. 6, the wire W3 of the second coil portion 342 is located between the wire W1 and the wire W2 of the first coil portion 341 on the other side in the circumferential direction of the cylindrical portion 41. The wire W3 passes through the wire W2 radially outward from a position between the wires W1 and W2 at the lower side of the tube 41. As shown in fig. 6, the wire W3 is wound so as to contact the cylindrical portion 41 on one side in the circumferential direction after traversing the wire W2. In this way, when the wire W3 is brought into contact with the cylindrical portion 41, the wire W2 can be pressed against the cylindrical portion 41 more firmly than when the wire W3 is not brought into contact with the cylindrical portion 41.

Let p, q be the natural number of p < q, wire W1 be an example of the p-th turn wire, and wire W2 be an example of the q-th turn wire. Let r be a natural number greater than p and q, and the wire W3 of the second coil portion 342 is an example of the wire of the r-th turn.

As shown in fig. 4, the wire W1 and the wire W2 of the first coil portion 341 are positioned at intervals in the radial direction on one side and the other side in the circumferential direction of the cylindrical portion 41. That is, the lead W1 and the lead W2 are disposed so as not to contact each other on one side and the other side in the circumferential direction of the tubular portion 41. Further, the radial distance D1 between the wire W1 and the wire W2 on the other circumferential side of the tube 41 is smaller than the diameter R1 of the wire W3. Further, on the other side in the circumferential direction of the tube 41, the groove 411 of the guide wire W1 and the groove 411 of the guide wire W2 are provided with a gap therebetween in the radial direction. Accordingly, the wire W3 is separated from the tube 41 between the wires W1 and W2 on the other circumferential side of the tube 41. The wire W1 is an example of a p-th turn wire, and the wire W2 is an example of a p+1th turn wire. By separating the wire W3 from the tube 41, the wires W1 and W2 can be firmly pressed against the tube 41. In addition, as in the present example, when the wires W1 and W2 are arranged at the interval D1, the wire W3 can be brought closer to the tube 41 than when the interval is not provided. This can enhance the force of pressing the wire W2 back toward the other radial side against the wire W3. Therefore, the wire W3 can be prevented from being displaced to one side in the radial direction beyond the wire W2.

As shown in fig. 4, on the other circumferential side of the cylindrical portion 41, the wire W2 is in contact with the wire W4, and the interval D2 therebetween is 0. Therefore, on the other circumferential side of the cylindrical portion 41, the interval D1 between the wires W1 and W2 is larger than the interval D2 between the wires W2 and W4. In addition, the wire W2 and the wire W4 are not necessarily in contact. The wire W1 is an example of a p-th turn wire, the wire W2 is an example of a p+1th turn wire, and the wire W4 is an example of a p+3rd turn wire.

As shown in fig. 4, a radial distance D4 between the two groove portions 411 that guide the wires W1, W2, respectively, is larger than the diameter R1 of the wires and smaller than the width (2·r1) of the two wires on the other side in the circumferential direction of the tubular portion 41.

As shown in fig. 3, the wire W12 of the fourth coil part 344 is in contact with the outer sides of the wire W2 of the first coil part 341 and the wire W3 of the second coil part 342 on the circumferential side of the tube part 41. Further, on the upper side of the tube 41, the wire W12 is located between the wires W2 and W3. Thereby, the wires W2 and W3 are pressed by the wire W12, and are firmly pressed against the tube 41.

As shown in fig. 3, 5 and 6, the wire W11 of the fourth coil part 344 is in contact with the wire W3 of the second coil part 342 and the wire W4 as a part of the third coil part 343 at one side and the upper side in the circumferential direction of the tube part 41. Thereby, the wires W3 and W4 are pressed by the wire W11, and thereby firmly pressed against the tube 41.

As shown in fig. 6, the wire W12 of the fourth coil portion 344 is in contact with the wire W4 and the wire W5 of the third coil portion 343 on the other side in the circumferential direction of the tube portion 41. As shown in fig. 4, on the other circumferential side of the cylindrical portion 41, a radial distance D3 between the wire W4 (first wire) and the wire W5 (second wire) is smaller than a diameter R1 of the wire. The wire W12 contacts the wire W4 and the wire W5 on the other side in the circumferential direction of the cylindrical portion 41, and is sandwiched by the wire W4 and the wire W5. The wires W4 and W5 are pressed by the wire W12, and thereby firmly pressed against the cylindrical portion 41. As shown in fig. 4, the radial distance D5 between the two grooves 411 guiding the wires W4 and W5, respectively, is larger than the diameter R1 of the wires and smaller than the width (2·r1) of the two wires.

As shown in fig. 6, the wire W13 of the fourth coil portion 344 is in contact with the wire W2 of the first coil portion 341 and the wire W4 of the third coil portion 343 on the other side in the circumferential direction of the tube portion 41. The wires W2 and W4 are pressed by the wire W13, and thereby are firmly pressed against the cylindrical portion 41.

According to the coil 34 of the present embodiment, the wire W3 of the second coil portion 342 is wound so as to traverse the wire W2 of the first coil portion 341. Accordingly, the wire W2 is sandwiched between the second coil portion 342 and the tube portion 41, and therefore the wire W2 can be firmly pressed against the tube portion 41. Therefore, the positional displacement of the first coil portion 341 in contact with the insulator 40, which is closer to the winding start end of the wire, can be easily suppressed. Further, by suppressing the positional displacement of the first layer of the coil 34, scattering or disturbance of the second layer formed on the first layer can be suppressed. This stabilizes the winding structure of the coil 34, and thus stabilizes the performance of the stator.

< 2. Modification >

In the above embodiment, the second coil portion 342 crossing the wire W2 as the first coil portion 341 is constituted by the third turn wire W3 as the next winding portion subsequent to the second turn. However, the second coil portion crossing the wire W2 may be constituted by the wire after the fourth turn. In this case, the wire W3 is wound around the tube 41 so as to be substantially parallel to the wire W2.

In the above embodiment, the second coil portion 342 of the wire W2 crossing the first coil portion 341 is constituted by only one turn of the wire W3, but this is not essential. For example, the second coil portion 342 may be formed of a plurality of turns of wire. Also, the wire after the third turn W3 and the fourth turn may also traverse the wire W2.

In the above embodiment, the wire W2 is positioned radially outward of the wire W1 below the cylindrical portion 41, and the wire W3 crosses the wire W2 radially outward from the wire W1 side (see fig. 6). However, the wire W2 may be disposed radially inward of the wire W1, and the wire W3 may be disposed so as to traverse the wire W2 from the wire W1 side to the radially inward side.

In the present embodiment, the third turn wire W3 traverses the second turn wire W2 among the wires W1 to W7 in contact with the insulator 40. However, it is also possible to traverse the wire after the fourth turn to the wire after the third turn. Also, the second turn of wire may be made to traverse the first turn of wire W1.

The coil holding portion 43 is not necessarily provided on the insulator 40. Even in the case where the coil holding portion 43 is not provided, positional displacement of the lead wire on the winding start end side is suppressed. Therefore, the lead-out wire on the winding start end side can be easily connected to the connection object (the control device 80 or the external device provided in the housing 11).

In the above embodiment, the coil 34 is wound from the radially inner side with respect to the tubular portion 41, but may be wound from the radially outer side. The coil lead-out wire 34a on the winding start side and the coil lead-out wire 34b on the winding end side may both be located radially inward or radially outward.

The motor 10 of the above embodiment is configured as an inner rotor type in which the rotor 20 is located radially inward of the stator 30. However, the motor may be configured as an outer rotor type in which the rotor is located radially outward of the stator.

The present invention has been described in detail, but the above description is illustrative of various aspects, and the present invention is not limited thereto. It should be understood that numerous modifications, not illustrated, can be envisaged without departing from the scope of the invention. The structures described in the above embodiments and modifications can be appropriately combined or omitted within a range not contradictory to each other.

Industrial applicability

The present invention can be used for a stator and a motor.

Claims

1. A stator is an annular stator centered on a central axis, wherein,

The stator includes:

a tooth extending in a radial direction relative to the central axis;

an insulating member mounted to the teeth; and

A coil formed of a wire wound around the insulating member,

The coil includes:

A first coil portion that is in contact with the insulating member; and

A second coil part crossing the first coil part with the first coil part sandwiched between the second coil part and the insulating member,

Let p and q be natural numbers p < q,

The first coil part includes:

A p-th turn of wire; and

A q-th turn of wire located radially outward of the p-th turn of wire,

The second coil portion crosses the q-th turn of wire from the p-th turn of wire side to the radially outer side.

2. The stator of claim 1, wherein,

The second coil portion has a portion that contacts the insulating member after traversing the first coil portion.

3. The stator of claim 1, wherein,

The second coil portion is arranged to traverse the q-th turn of wire radially outward from a position between the p-th turn of wire and the q-th turn of wire.

4. The stator according to claim 2 or 3, wherein,

Let r be a natural number greater than p and q,

The second coil part is an r-th turn of wire,

The r turn of wire traverses the q turn of wire from the p turn wire side.

5. The stator according to claim 2 or 3, wherein,

The first coil part comprises a p-th turn of wire and a p+1th turn of wire,

The second coil part is the p+2th turn wire.

6. The stator of claim 5, wherein,

The coil further includes a third coil portion which is a portion subsequent to the second coil portion and is in contact with the insulating member.

7. The stator of claim 6, wherein,

The third coil part comprises a p+3rd turn of wire,

The coil has a portion in which a radial interval between the p-th turn of wire and the p+1-th turn of wire is greater than a radial interval between the p+1-th turn of wire and the p+3-th turn of wire.

8. The stator of claim 5, wherein,

The radial interval between the p-th turn of wire and the p+1-th turn of wire is smaller than the diameter of the wire.

9. The stator of claim 6, wherein,

The coil further includes a fourth coil portion in contact with at least a portion of the first and third coil portions.

10. The stator of claim 9, wherein,

A portion of the wires of the fourth coil portion are in contact with the first coil portion and the second coil portion.

11. The stator according to claim 9 or 10, wherein,

A portion of the wires of the fourth coil portion are in contact with the second coil portion and the third coil portion.

12. The stator according to claim 9 or 10, wherein,

A portion of the wires of the fourth coil portion are in contact with the first coil portion and the third coil portion.

13. The stator according to claim 9 or 10, wherein,

The third coil part has a first wire and a second wire which are spaced apart in a radial direction by a distance narrower than a diameter of the wires,

A portion of the wire constituting the fourth coil portion is in contact with and sandwiched by the first wire and the second wire.

14. The stator of claim 1, wherein,

The p-th turn is the 1 st turn.

15. The stator according to any one of claim 1 to 3, wherein,

The first coil portion includes a 2 nd turn of wire.

16. The stator according to any one of claim 1 to 3, wherein,

The insulating member includes a cylindrical insulator covering the teeth.

17. The stator according to any one of claim 1 to 3, wherein,

The insulating member has a groove portion for guiding winding of the wire.

18. The stator according to any one of claim 1 to 3, wherein,

The insulating member includes a coil holding portion that holds a portion led out from a first turn of the wire in the coil portion.

19. A motor is provided with:

the stator of any one of claims 1 to 18; and

And a rotor rotatably supported on the radial inner side or the radial outer side of the stator about the central axis.