JP2020108266A - Stator, motor, and method of manufacturing stator - Google Patents

Abstract

To provide a motor that allows simplification of a connection structure of an extension line.SOLUTION: A coil wire 40 includes: a plurality of coils 50 structured by being wound on teeth 12; and a pair of leading wires 41 positioned at an end part of each of the coil wires and extending from the coil. The pair of leading wires include: a starting point leading wire 41A; and a terminal point leading wire 41B. A slot is positioned between adjacent teeth in a peripheral direction, and a ratio of the number of magnetic electrodes to the number of slots of a rotor is 4:3. Each coil forms at least one phase of a U-phase, a V-phase, and a W-phase. The slot from which the terminal point leading wire of the coil form one phase of the U-phase, the V-phase, and the W-phase is led is the same as the slot from which the starting point leading wire of the coil forming another one phase from the U-phase, the V-phase, and the W-phase is led.SELECTED DRAWING: Figure 5

Description

The present invention relates to a stator, a motor, and a stator manufacturing method.

Generally, a coil of a motor is constructed by winding a coil wire around a tooth of a stator core. Leading wires are drawn out from the coil as a winding start portion and a winding end portion of the coil wire. Further, when winding one coil wire around a plurality of teeth, a connecting wire that connects the coils is drawn above the coil. In the winding step, since the crossover wire of the coil wire to be wound first does not hinder the path of the coil wire to be wound later, the crossover wire is routed outside the coil in the radial direction. Patent Document 1 discloses a structure in which a protrusion is provided on the outer side in the radial direction of a coil and a crossover is made to follow the protrusion.

JP, 2014-108007, A

However, in the conventional structure, there is a possibility that the processing of the lead wire after winding the conductive wire around each tooth becomes complicated.

In view of the above circumstances, it is an object of the present invention to provide a motor capable of simplifying the connecting structure of lead wires.

A three-phase motor having a stator core having an annular core back centered on a central axis extending in the up-down direction and a plurality of teeth extending radially inward from the core back, and a plurality of coil wires wound around the teeth. And a rotor having a rotor magnet and rotatable with respect to the stator, wherein the coil wire includes a plurality of coils wound around the teeth and an end portion of the coil wire. And a pair of leader lines that are located and extend from the coil, the pair of leader lines include a start point leader line and an end point leader line, and between the teeth that are adjacent in the circumferential direction, respectively. A slot is located, a ratio of the number of magnetic poles of the rotor to the number of the slot is 4:3, and the coil constitutes at least one of a U phase, a V phase, and a W phase. Phase, the V phase, and the W phase, the slot from which the end point lead wire of the coil that constitutes one phase is drawn out is the other one of the U phase, the V phase, and the W phase. This is the same as the slot from which the starting point leader line of the coil that constitutes the phase is drawn.

One mode of a motor of the present invention is a stator core having an annular core back centered on a central axis extending in the vertical direction and a plurality of teeth extending radially inward from the core back, and an insulator attached to the stator core. And a plurality of coil wires wound around the teeth via the insulator. The insulator has a base portion that surrounds the outer peripheral surface of the tooth, and an outer wall portion that is located immediately above the core back and extends along the circumferential direction. The plurality of coil wires are, respectively, a plurality of coils wound around the teeth by concentrated winding, a connecting wire connecting the plurality of coils, and a pair of lead wires extending from the coils located at the ends of the coil wires. And. Each of the connecting wires of the plurality of coil wires has an outer passage portion that extends along the outer surface of the outer wall portion on the radially outer side of the outer wall portion. The crossover wire of at least one of the coil wires has an inner passage portion that extends linearly inward in the radial direction of the outer wall portion and is connected at both ends to the outer passage portion. The inner passage portion is located radially inward of the lead wire of the other coil wire.

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of a stator, a motor, and a stator which can suppress contact between a connecting wire and a leader wire can be provided.

FIG. 1 is a sectional view of a motor according to an embodiment. FIG. 2 is a cross-sectional view of the stator according to the embodiment. FIG. 3 is a perspective view of the stator according to the embodiment. FIG. 4 is an enlarged view in which a part of FIG. 3 is enlarged. FIG. 5 is a plan view of the stator according to the embodiment. FIG. 6 is a diagram showing a procedure for winding the U-phase coil. FIG. 7 is a diagram showing a procedure for winding the V-phase coil. FIG. 8 is a diagram showing a procedure for winding the W-phase coil. FIG. 9: is a perspective view which shows the hanging part of one Embodiment. 10: is a perspective view which shows the hanging part of the modified example 1. FIG. 11: is a perspective view which shows the hanging part of the modified example 2. FIG. FIG. 12 is a perspective view of the rotor according to the embodiment.

Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the drawings. In the following drawings, the scale and the number of each structure may be different from the actual structure in order to make each structure easy to understand.

In each drawing, an XYZ coordinate system is shown as appropriate. In this specification, the Z-axis direction is a vertical direction in which the positive side is the upper side and the negative side is the lower side. A central axis J shown in each drawing is an imaginary line that is parallel to the Z-axis direction and extends in the vertical direction. In the following description, the axial direction of the central axis J, that is, the direction parallel to the vertical direction is simply referred to as “axial direction”, the radial direction around the central axis J is simply referred to as “radial direction”, and the central axis J The circumferential direction centered around is simply called the "circumferential direction". In each figure, the circumferential direction is appropriately indicated by an arrow θ.

The positive side in the Z-axis direction in the axial direction is called "upper side", and the negative side in the Z-axis direction in the axial direction is called "lower side". In addition, the side that advances clockwise when viewed from the upper side to the lower side in the circumferential direction, that is, the side that advances in the direction of arrow θ is referred to as “one side in the circumferential direction”. The side that moves counterclockwise when viewed from the upper side to the lower side in the circumferential direction, that is, the side that moves in the direction opposite to the direction of the arrow θ is referred to as “the other side in the circumferential direction”.

It should be noted that the up-down direction, the upper side, and the lower side are merely names for explaining the positional relationship between the respective parts, and the actual positional relationship is a positional relationship other than the positional relationship indicated by these names. May be.

<Motor>
FIG. 1 is a cross-sectional view of the motor 1 of this embodiment. The motor 1 of this embodiment is a three-phase AC motor. Further, the motor 1 of this embodiment is an inner rotor type motor. The application of the motor 1 of this embodiment is not particularly limited. The motor 1 is mounted on, for example, an electric pump, an electric power steering system, or the like. FIG. 12 is a perspective view of the rotor 2 according to this embodiment.

The motor 1 includes a rotor 2, a stator 3, a bearing holder 4, a housing 5, and a pair of bearings 6. The rotor 2 rotates relative to the stator 3 about a central axis J extending along the up-down direction.

The housing 5 has a cylindrical shape having a bottom. The housing 5 accommodates the rotor 2, the stator 3, the bearing holder 4, and the pair of bearings 6 inside. The bearing holder 4 is located above the stator 3. The bearing holder 4 is supported on the inner peripheral surface of the housing 5.

The pair of bearings 6 are axially spaced from each other. The pair of bearings 6 support the shaft 2 a of the rotor 2. One of the pair of bearings 6 is supported by the bearing holder 4, and the other is supported by the housing 5.

<Rotor>
The rotor 2 rotates about the central axis J. The rotor 2 is opposed to the stator 3 with a gap in the radial direction. The rotor 2 includes a shaft 2a having a central axis J, a rotor core 2b, and at least one magnet 2c.

The shaft 2a extends along the central axis J. In the example of the present embodiment, the shaft 2a has a cylindrical shape extending in the axial direction. The shaft 2a is supported by a plurality of bearings 6 so as to be rotatable around the central axis J. The shaft 2a is not limited to the cylindrical shape described above, but may be, for example, a cylindrical shape.

The rotor core 2b is configured by stacking a plurality of electromagnetic steel plates in the axial direction. The rotor core 2b is provided with a central hole 2h penetrating in the axial direction. The center hole 2h is located at the center of the rotor core 2b when viewed in the axial direction. The shaft 2a is passed through the central hole 2h. The shaft 2a is directly or indirectly fixed to the rotor core 2b.

The magnet 2c is fixed to the outer peripheral surface of the rotor core 2b. The magnet 2c faces the tooth 12 of the stator 3 in the radial direction. The magnet 2c of this embodiment is a plurality of magnets lined up in the circumferential direction. In this case, the magnet having the N pole on the outer side in the radial direction and the magnet having the S pole on the outer side in the radial direction are alternately arranged in the circumferential direction. The rotor 2 may have an annular magnet. In this case, the magnet 2c is provided with N poles and S poles alternately arranged along the circumferential direction. In this embodiment, the rotor 2 has eight magnetic poles.

The rotor 2 of the present embodiment is an SPM (Surface Permanent Magnet) type rotor in which the magnet 2c is arranged on the outer peripheral surface of the rotor core 2b. However, the rotor 2 may be an IPM (Interior Permanent Magnet) type rotor in which a magnet is embedded inside the rotor core. In the present embodiment, the rotor core 2b and the magnet 2c are further housed inside the cylindrical rotor cover 2d. The rotor cover 2d may be fixed to the rotor core 2b and the magnet 2c by, for example, caulking. The rotor 2 may be a so-called spoke type in which the magnetic poles of the magnet are oriented in the circumferential direction. In this case, the magnet has two magnetic poles arranged along the circumferential direction. It is desirable that the magnetic poles of the magnets adjacent to each other in the circumferential direction have the same poles facing each other in the circumferential direction.

<Stator>
The stator 3 has a substantially annular shape centered on the central axis J. The stator 3 includes a stator core 10, an insulator 20, and a plurality of coil wires 40. The coil wire 40 constitutes the coil 50.

<Stator core>
The stator core 10 surrounds the rotor 2 on the radially outer side of the rotor 2. The stator core 10 is configured, for example, by stacking a plurality of electromagnetic steel plates in the axial direction. Therefore, the stator core 10 extends in the axial direction with a uniform cross section. The stator core 10 of the present embodiment is an integral stator core that is not divided along the circumferential direction.

FIG. 2 is a sectional view of the stator 3. As shown in FIG. 2, the stator core 10 has a core back 11, a plurality of teeth 12, and a plurality of umbrella portions 13.

The core back 11 has a substantially annular shape centered on the central axis J. The outer peripheral surface of the core back 11 is fixed to the inner peripheral surface of the housing 5.

The teeth 12 extend radially inward from the core back 11. In the present embodiment, the stator core 10 is provided with six teeth 12. The teeth 12 extend in the radial direction with a substantially uniform cross section. The plurality of teeth 12 are arranged at equal intervals along the circumferential direction. The coil wire 40 is wound around the tooth 12 via the insulator 20. Therefore, the coil wire 40 passes between the pair of teeth 12 adjacent to each other in the circumferential direction.

The umbrella portion 13 is located at the tip on the radially inner side of the tooth 12. The umbrella portion 13 is wider than the teeth 12 in the circumferential direction. That is, the dimension of the umbrella portion 13 along the circumferential direction is larger than the dimension of the teeth 12 along the circumferential direction. The surface of the umbrella portion 13 that faces inward in the radial direction has an arc shape centered on the central axis J when viewed in the axial direction. The surface of the umbrella portion 13 that faces the inner side in the radial direction faces the magnet 2c of the rotor 2 in the radial direction.

<Insulator>
As shown in FIG. 1, the insulator 20 is attached to the stator core 10. The insulator 20 is made of an insulating material (for example, an insulating resin). The insulator 20 is interposed between the stator core 10 and the coil wire 40 to ensure insulation between the stator core 10 and the coil wire 40.

The insulator 20 has an upper piece 20A and a lower piece 20B. The upper piece 20A and the lower piece 20B are each a single member. Each of the upper piece 20A and the lower piece 20B has a substantially annular shape centered on the central axis J. The upper piece 20A is attached to the stator core 10 from above. The lower piece 20B is attached to the stator core 10 from below. The upper piece 20A surrounds the upper end surface of the core back 11 and the upper regions of both end surfaces of the tooth 12 in the circumferential direction. Further, the lower piece 20B surrounds the lower end surface of the core back 11 and the lower region of both circumferential end surfaces of the tooth 12. The insulator 20 surrounds the outer peripheral surface of the tooth 12 by attaching the upper piece 20A and the lower piece 20B to the stator core 10 from above and below.

The upper piece 20A and the lower piece 20B may have the same shape or different shapes. Further, the upper piece 20A and the lower piece 20B may be composed of a single member. That is, the insulator may be a single tubular member.

The insulator 20 has a base portion 21, an inner wall portion 23, and an outer wall portion 24.

The base 21 surrounds the outer peripheral surface of the tooth 12. The same number of bases 21 as the teeth 12 are provided. In this embodiment, the insulator 20 is provided with six base portions 21. In the present embodiment, the base portion 21 surrounds the entire outer peripheral surface of the tooth 12. However, the base portion 21 may expose a part of the outer peripheral surface of the tooth 12 as long as it can ensure the insulation between the tooth 12 and the coil wire 40.

Plural inner wall portions 23 are provided in the insulator 20. Each inner wall portion 23 overlaps the umbrella portion 13 when viewed in the axial direction. The inner wall portion 23 extends in the circumferential direction. The inner wall portion 23 is provided on each of the upper piece 20A and the lower piece 20B. In the upper piece 20A and the lower piece 20B, the inner wall portions 23 are provided in the same number as the teeth 12, respectively. The inner wall portion 23 of the upper piece 20A is located directly above the umbrella portion 13 and contacts the upper end surface of the umbrella portion 13. The inner wall portion 23 of the lower piece 20B is located immediately below the umbrella portion 13 and contacts the lower end surface of the umbrella portion 13. The inner wall portion 23 restricts the movement of the coil wire 40 wound around the tooth 12 inward in the radial direction.

The outer wall portion 24 has an annular shape centered on the central axis J. The outer wall portion 24 is provided on each of the upper piece 20A and the lower piece 20B. The outer wall portion 24 of the upper piece 20A is located immediately above the core back 11 and contacts the upper end surface of the core back 11. The outer wall portion 24 of the lower piece 20B is located immediately below the core back 11, and contacts the lower end surface of the core back 11. That is, the pair of outer wall portions 24 overlaps the core back 11 when viewed in the axial direction.

The outer wall portion 24 extends along the circumferential direction. The outer wall portion 24 faces the inner wall portion 23 in the radial direction. The outer wall portion 24 restricts the coil wire 40 wound around the tooth 12 from moving outward in the radial direction.

FIG. 3 is a perspective view of the stator 3. Note that FIG. 3 is a diagram showing the state of the stator 3 immediately after the winding step. After the winding step, a step of raising the lead wire 41 in the axial direction is performed.

As shown in FIG. 3, the outer wall portion 24 of the upper piece 20A has a plurality of lead wire notches (notches) 24a, a plurality of connecting wire notches (notches) 24b, and a plurality of first notches. A convex portion (convex portion) 24c and a plurality of second convex portions (convex portion) 24d are provided.

The lead wire notch portion 24 a is opened upward and extends downward from the upper end surface of the outer wall portion 24. The leader line notch 24a penetrates in the radial direction. The outer wall portion 24 of the present embodiment is provided with five leader wire notches 24a. The five leader wire notches 24 a are located on the outside in the radial direction of the coil 50.

The lead wire 41 extending from the coil 50 is passed through the lead wire notch portion 24a in the winding process of the coil wire 40. The lead wire 41 is in a state of being drawn from the coil 50 toward the outer side in the radial direction by being passed through the lead wire notch portion 24a. Thereby, the lead wire 41 does not project upward from the coil 50 and does not hinder the path of the coil wire 40 in the winding process. The lead wire 41 passed through the lead wire notch portion 24a is raised to the upper side after the winding step is completed.

In the present embodiment, the leader wire notch 24 a is not provided on the radially outer side of the coil 50 that is wound last among the six coils 50. The lead wire 41 extending from the coil 50 wound last is not drawn off the path of the other coil wire 40 because it is drawn out at the end of the winding process. Therefore, the lead wire 41 of the coil 50 to be wound last need not be passed through the lead wire notch 24a, and the lead wire notch 24a is not provided.

The connecting wire notch 24b is opened upward and extends downward from the upper end surface of the outer wall portion 24. The connecting wire notch 24b penetrates in the radial direction. The connecting wire 42 of the coil wire 40 passes through the connecting wire notch 24b. That is, the crossover wire 42 is routed from the radially inner side of the outer wall portion 24 to the radially outer side via the crossover wire notch 24b.

The first convex portion 24c and the second convex portion 24d are provided on the outer side surface 24p of the outer wall portion 24 that faces the outer side in the radial direction. The first convex portion 24c and the second convex portion 24d project radially outward from the outer surface 24p of the outer wall portion 24. The 1st convex part 24c and the 2nd convex part 24d are located in the radial direction outer side of the outer wall part 24, and above the coil wire 40 routed along the outer side surface 24p. The 1st convex part 24c and the 2nd convex part 24d restrict|limit the movement to the upper side of the coil wire 40, and suppress that the coil wire 40 rides on the upper side of the outer wall part 24.

As shown in FIG. 3, a crossover 42 of the plurality of coil wires 40 is wound around the outer surface 24p of the outer wall portion 24. The plurality of connecting wires 42 extend along the outer side surface 24p on the outer side in the radial direction of the outer wall portion 24. The pair of crossover wires 42 among the plurality of crossover wires 42 extend radially outward of the outer wall portion along the outer surface 24p of the outer wall portion in the vertical direction. The pair of crossover wires 42 are respectively drawn out to the outside in the radial direction of the outer wall portion 24 through the crossover wire notches 24b.

Here, of the pair of crossover wires 42 extending side by side in the vertical direction, one on the upper side is an upper crossover wire 42A, and the other one on the lower side is a lower crossover wire 42B. That is, the lower crossover wire 42B is located below the upper crossover wire 42A. In addition, the crossover wire cutout portion 24b through which the upper crossover wire 42A passes is defined as an upper cutout portion (first cutout portion) 24bA, and the crossover wire cutout portion 24b through which the lower crossover wire 42B passes is defined as a lower cutout portion (first cutout portion). 2 notches) 24bB.

FIG. 4 is a partially enlarged view of the stator 3. As shown in FIG. 4, the upper cutout portion 24bA and the lower cutout portion 24bB each have a bottom surface 24ba facing upward. The bottom surface 24ba of the lower cutout portion 24bB is located below the bottom surface 24ba of the upper cutout portion 24bA.

The 1st convex part 24c has the lower surface 24ca which faces the lower side. Similarly, the second convex portion 24d has a lower surface 24da facing downward. The lower surface 24da of the second convex portion 24d is located above the lower surface 24ca of the first convex portion 24c.

The bottom surface 24ba of the upper cutout portion 24bA and the lower cutout portion 24bB and the lower surfaces 24ca and 24da of the first convex portion 24c and the second convex portion 24d are arranged at different positions in the vertical direction. These vertical positions are, from the upper side to the lower side, the lower surface 24da of the second convex portion 24d, the bottom surface 24ba of the upper cutout portion 24bA, the lower surface 24ca of the first convex portion 24c, and the lower cutout portion 24bB. The order is the bottom surface 24ba.

The lower surface 24da of the second convex portion 24d is located above the bottom surface 24ba of the upper cutout portion 24bA. The vertical distance between the lower surface 24da of the second convex portion 24d and the bottom surface 24ba of the upper cutout portion 24bA is slightly larger than the wire diameter of the coil wire 40.

The upper crossover 42A is pulled out to the outside in the radial direction of the outer wall 24 through the upper cutout 24bA. Further, the upper crossover 42A is circumferentially routed along the outer side surface 24p of the outer wall portion 24. The upper crossover 42A passes immediately below the second convex portion 24d. That is, when viewed in the vertical direction, the upper connecting wire 42A and the second convex portion 24d overlap each other. The upper crossover 42A may be in contact with the lower surface 24da of the second protrusion 24d. The upper crossover 42A extends in the circumferential direction between the lower surface 24da of the second protrusion 24d and the bottom surface 24ba of the upper cutout 24bA in the vertical direction. According to the present embodiment, by arranging the upper crossover wire 42A so as to be sandwiched between the second convex portion 24d and the bottom surface 24ba of the upper cutout portion 24bA, it is possible to stabilize the routing of the upper crossover wire 42A.

The bottom surface 24ba of the lower cutout portion 24bB is located below the lower surface 24ca of the first convex portion 24c. The vertical distance between the bottom surface 24ba of the lower cutout portion 24bB and the lower surface 24ca of the first convex portion 24c is slightly larger than the wire diameter of the coil wire 40.

The lower crossover wire 42B is drawn out to the outside in the radial direction of the outer wall portion 24 through the lower cutout portion 24bB. Further, the lower crossover 42B is routed in the circumferential direction along the outer side surface 24p of the outer wall portion 24. The lower crossover 42B passes immediately below the first convex portion 24c. That is, when viewed from above and below, the lower crossover 42B and the first convex portion 24c overlap each other. The lower crossover 42B may be in contact with the lower surface 24ca of the first convex portion 24c. The lower crossover 42B extends in the circumferential direction between the lower surface 24ca of the first convex portion 24c and the bottom surface 24ba of the lower cutout portion 24bB in the vertical direction. According to the present embodiment, by arranging the lower crossover wire 42B so as to be sandwiched between the first convex portion 24c and the bottom surface 24ba of the lower cutout portion 24bB, it is possible to stabilize the routing of the lower crossover wire 42B. You can

In the present embodiment, the circumferential width of the second convex portion 24d is longer than the circumferential width of the first convex portion 24c. In the winding step, the upper connecting wire 42A is hung on the second convex portion 24d. The upper crossover 42A passes near the upper end of the outer wall portion 24. According to the present embodiment, by providing the second convex portion 24d long in the sealing direction and gripping the upper crossover wire 42A with a sufficient length in the circumferential direction, the upper crossover wire 42A falls off from the outer wall portion 24 inward. Can be effectively suppressed. On the other hand, in the winding step, the lower crossover wire 42B is hung on the first convex portion 24c. By shortening the circumferential length of the first convex portion 24c, the lower crossover wire 42B can be easily hooked on the first convex portion 24c.

In the present embodiment, since the upper crossover 42A is passed through the upper cutout 24bA, it is difficult for the upper crossover 42A to move below the bottom surface 24ba of the upper cutout 24bA. In addition, since the lower crossover 42B passes directly below the first convex portion 24c, it is difficult to move to the upper side of the lower surface 24ca of the first convex portion 24c. In the present embodiment, the bottom surface 24ba of the upper cutout portion 24bA is located above the lower surface 24ca of the first convex portion 24c. Therefore, according to the present embodiment, it is possible to prevent the upper crossover wire 42A and the lower crossover wire 42B from contacting each other.

In the present embodiment, the first protrusion 24c is arranged adjacent to the upper cutout 24bA in the circumferential direction. That is, the first convex portion 24c is arranged near the upper cutout portion 24bA. Therefore, the first protrusion 24c suppresses the lower crossover wire 42B from moving upward, and the upper cutout 24bA suppresses the lower crossover wire 42A from moving downward. According to the present embodiment, the first convex portion 24c and the upper cutout portion 24bA are arranged adjacent to each other in the circumferential direction, so that the upper crossover wire 42A and the lower crossover wire 42B loosely contact each other. This can be effectively suppressed.

<Coil wire>
Next, the coil wire 40 will be described more specifically. FIG. 5 is a plan view schematically showing the stator 3.

The coil wire 40 is wound around the tooth 12 via the insulator 20 to form a coil 50. The coil 50 is wound around the tooth 12 by concentrated winding. The stator 3 of the present embodiment is provided with three coil wires 40.

When the three coil wires 40 are distinguished from each other in the following description, they are respectively referred to as a U-phase coil wire (first coil wire) 40U, a V-phase coil wire (second coil wire) 40V, and a W-phase coil wire. (Third coil wire) 40W.

The three coil wires 40 are each a plurality (two in the present embodiment) of coils 50, a crossover wire 42 that connects the plurality of coils 50, and is located at an end of the coil wire 40 and extends from the coil 50. And a pair of leader lines 41. One of the pair of lead wires 41 is located at the end of the coil wire 40 at the beginning of winding, and the other is located at the end of the end of winding of the coil wire 40. In the following description, when distinguishing a pair of leader lines 41 from each other, one located at the end of the winding start is referred to as a start point leader line 41A, and the other located at the end of the winding end is referred to as an end point leader line 41B. In the present embodiment, the start-point leader line 41A and the end-point leader line 41B extend from the radially outer end of the coil 50.

The six coils 50 provided in the stator 3 are classified into two U-phase coils 50U, two V-phase coils 50V and two W-phase coils 50W.

In FIG. 5, the tooth 12 located in the +Y direction (direction at 12:00) with respect to the central axis J is referred to as a first tooth 12A. In addition, the respective teeth 12 are referred to as second to sixth teeth 12B to 12F from the first teeth 12A toward one side in the circumferential direction.

The two U-phase coils 50U are configured by winding the U-phase coil wire 40U around different teeth 12. The two U-phase coils 50U are configured by winding the U-phase coil wire 40U around the first teeth 12A and the fourth teeth 12D, respectively. The two U-phase coils 50U are connected to each other at the crossover line 42. Further, a lead wire 41 is drawn out from each of the two U-phase coils 50U.

The two V-phase coil 50V is configured by winding the V-phase coil wire 40V around the teeth 12 different from each other. The two V-phase coils 50V are configured by winding the V-phase coil wire 40V around the second teeth 12B and the fifth teeth 12E, respectively. The two V-phase coils 50V are connected to each other at the crossover 42. A lead wire 41 is drawn from each of the two V-phase coils 50V.

The two W-phase coils 50W are configured by winding the W-phase coil wire 40W around the teeth 12 different from each other. The two W-phase coils 50W are configured by winding the W-phase coil wire 40W around the third teeth 12C and the sixth teeth 12F, respectively. The two W-phase coils 50W are connected to each other at the crossover wire 42. Further, a lead wire 41 is drawn out from each of the two W-phase coils 50W.

6 to 8 are diagrams showing a procedure for winding the U-phase coil wire 40U, the V-phase coil wire 40V, and the W-phase coil wire 40W, respectively. 6 to 8 are schematic views of the first to sixth teeth 12A to 12F viewed from the central axis J side (that is, from the inside in the radial direction).

The three coil wires 40 are wound around the tooth 12 in the order of the U-phase coil wire 40U, the V-phase coil wire 40V, and the W-phase coil wire 40W. All the coil wires 40 are wound counterclockwise around the teeth 12 when viewed from the central axis J side.

As shown in FIG. 5, all the coil wires 40 (the U-phase coil wire 40U, the V-phase coil wire 40V, and the W-phase coil wire 40W) have crossover wires 42, a lead-out portion 42c, a lead-in portion 42d, and an outer passage portion. 42a. Further, the crossover wire 42 of the V-phase coil wire 40V and the W-phase coil wire 40W has an inner passage portion 42b that extends linearly inside the outer wall portion 24 in the radial direction. That is, the crossover wire 42 of the U-phase coil wire 40U does not have the inner passage portion 42b.

The pull-out portion 42c is pulled out from the coil 50 wound around the tooth 12. The lead-out portion 42c is drawn out from the coil 50 radially outward, passes through the crossover wire notch portion 24b, and is drawn radially outward of the outer wall portion 24. The lead-out portion 42c is connected to the end portion on the other side in the circumferential direction of the outer passage portion 42a.

The outer passage portion 42a extends in the circumferential direction. The outer passage portion 42a extends along the outer surface 24p of the outer wall portion 24 radially outside the outer wall portion 24. The U-phase coil wire 40U has one outside passage portion 42a. On the other hand, the V-phase coil wire 40V and the W-phase coil wire 40W have two outer passage portions 42a. In the V-phase coil wire 40V and the W-phase coil wire 40W, an inner passage portion 42b is provided between the two outer passage portions 42a.

Both ends of the inner passage portion 42b are connected to the outer passage portion 42a. The inner passage portion 42b passes through the connecting wire notches 24b at both ends. As a result, the inner passage portion 42b passes inside the outer wall portion 24 in the radial direction. The inner passage portion 42b extends linearly between the pair of connecting wire notches 24b.

The lead-in portion 42d is connected to the end portion on one side in the circumferential direction of the outer passage portion 42a. The lead-in portion 42d passes through the connecting wire notch portion 24b and is drawn from the radially outer side of the outer wall portion 24 to the radially inner side, and is connected to the coil 50.

(U-phase coil wire)
As shown in FIG. 6, the U-phase coil wire 40U is first wound around the first tooth 12A and then wound around the fourth tooth 12D. As a result, the U-phase coil wire 40U constitutes a pair of U-phase coils 50U. A starting point lead wire 41A extends from the U-phase coil 50U wound around the first tooth 12A. Further, the end point lead wire 41B extends from the U-phase coil 50U wound around the fourth tooth 12D. As shown in FIG. 5, a start point lead wire 41A and an end point lead wire 41B of the U-phase coil wire 40U are drawn radially outward through the lead wire notch portion 24a.

As shown in FIG. 5, the pair of U-phase coils 50U are connected to each other via a connecting wire 42. The lead-out portion 42c of the crossover wire 42 extends from the U-phase coil 50U wound around the first tooth 12A. The lead-out portion 42c is led out to the outside in the radial direction of the outer wall portion 24 through the crossover wire notch portion 24b located on the outside in the radial direction of the first tooth 12A, and is connected to the outside passage portion 42a.

The crossover wire 42 of the U-phase coil wire 40U is circumferentially one side along the outer side surface 24p of the outer wall portion 24 located radially outside the second teeth 12B and the third teeth 12C in the outer passage portion 42a. Extend. The crossover wire 42 of the U-phase coil wire 40U is drawn in to the inside of the outer wall portion 24 in the drawing-in portion 42d through the crossover wire cutout portion 24b located on the outside in the radial direction of the fourth tooth 12D. The connecting wire 42 of the U-phase coil wire 40U is wound around the fourth tooth 12D at the end of the lead-in portion 42d and is connected to the U-phase coil 50U.

(V phase coil wire)
As shown in FIG. 7, the V-phase coil wire 40V is first wound around the fifth tooth 12E and then wound around the second tooth 12B. As a result, the V-phase coil wire 40V constitutes a pair of V-phase coils 50V. A starting point lead wire 41A extends from the V-phase coil 50V wound around the fifth tooth 12E. In addition, the end point lead-out wire 41B extends from the V-phase coil 50V wound around the second teeth 12B. As shown in FIG. 5, a start point lead wire 41A and an end point lead wire 41B of the V-phase coil wire 40V are led out to the outside in the radial direction through the lead wire notch portion 24a.

As shown in FIG. 5, the pair of V-phase coils 50V are connected to each other via a connecting wire 42. The lead-out portion 42c of the crossover wire 42 extends from the V-phase coil 50V wound around the fifth tooth 12E. The lead-out portion 42c is led out to the outside in the radial direction of the outer wall portion 24 through the crossover wire notch portion 24b located on the outside in the radial direction of the fifth tooth 12E, and is connected to the outside passage portion 42a.

The crossover wire 42 of the V-phase coil wire 40V extends to one side in the circumferential direction along the outer side surface 24p of the outer wall portion 24 located on the outer side in the radial direction of the sixth teeth 12F in the outer side passage portion 42a, and the inner side passage portion. Connect to 42b. The inner passage portion 42b passes through the connecting wire notch portion 24b located between the sixth tooth 12F and the first tooth 12A in the circumferential direction and is drawn inward in the radial direction of the outer wall portion 24.

The inner passage portion 42b drawn inward in the radial direction of the outer wall portion 24 linearly passes directly above the first teeth 12A. The inner passage portion 42b of the V-phase coil wire 40V passes immediately above the U-phase coil 50U wound around the first tooth 12A. That is, a part of the inner passage portion 42b of the V-phase coil wire 40V overlaps with the coil 50 (U-phase coil 50U in the present embodiment) that has already been wound when viewed in the axial direction. Further, the inner passage portion 42b is located radially inside the starting point lead wire 41A extending from the U-phase coil 50U wound around the first tooth 12A.

The inner passage portion 42b that has passed immediately above the first tooth 12A passes through the crossover wire notch portion 24b located between the first tooth 12A and the second tooth 12B in the circumferential direction, and the diameter of the outer wall portion 24. It is pulled out in the direction outside. The inner passage portion 42b pulled out to the outside in the radial direction of the outer wall portion 24 is connected to the outer passage portion 42a. The outer passage portion 42a extends to one side in the circumferential direction along the outer surface 24p of the outer wall portion 24 and is connected to the lead-in portion 42d. The lead-in portion 42d of the V-phase coil wire 40V is pulled inward in the radial direction of the outer wall portion 24 through the crossover wire notch portion 24b located outside of the second tooth 12B in the radial direction. The crossover wire 42 of the V-phase coil wire 40V is wound around the second tooth 12B at the end of the lead-in portion 42d and is connected to the V-phase coil 50V.

(W-phase coil wire)
As shown in FIG. 8, the W-phase coil wire 40W is first wound around the third tooth 12C and then wound around the sixth tooth 12F. As a result, the W-phase coil wire 40W constitutes a pair of W-phase coils 50W. A start point lead wire 41A extends from the W-phase coil 50W wound around the third teeth 12C. In addition, the end point lead wire 41B extends from the W-phase coil 50W wound around the sixth tooth 12F. As shown in FIG. 5, the lead wire 41A at the starting point of the W-phase coil wire 40W is drawn radially outward through the lead wire notch 24a. Further, the end point lead wire 41B of the W-phase coil wire W is extended upward.

As shown in FIG. 5, the pair of W-phase coils 50W are connected to each other via a connecting wire 42. The lead-out portion 42c of the crossover wire 42 extends from the W-phase coil 50W wound around the third tooth 12C. The lead-out portion 42c is led out to the outside in the radial direction of the outer wall portion 24 through the crossover wire notch portion 24b located on the outside in the radial direction of the third tooth 12C, and is connected to the outside passage portion 42a.

The crossover wire 42 of the W-phase coil wire 40W extends to one side in the circumferential direction along the outer surface 24p of the outer wall portion 24 in the outer passage portion 42a and is connected to the inner passage portion 42b. The inner passage portion 42b passes through the connecting wire notch portion 24b located between the third tooth 12C and the fourth tooth 12D in the circumferential direction, and is drawn inward in the radial direction of the outer wall portion 24.

The inner passage portion 42b drawn inward in the radial direction of the outer wall portion 24 linearly passes immediately above the fourth teeth 12D and the fifth teeth 12E. The inside passage portion 42b of the W-phase coil wire 40W passes directly above the U-phase coil 50U wound around the fourth tooth 12D and the V-phase coil 50V wound around the fifth tooth 12E. That is, a part of the inner passage portion 42b of the W-phase coil wire 40W overlaps with the coil 50 (U-phase coil 50U and V-phase coil 50V in the present embodiment) that has already been wound when viewed in the axial direction. The inner passage portion 42b is located radially inside the end point lead wire 41B extending from the U-phase coil 50U wound around the fourth tooth 12D. In addition, the inner passage portion 42b is located radially inward of the starting point lead wire 41A extending from the V-phase coil 50V wound around the fifth tooth 12E.

The inner passage portion 42b that has passed directly above the fourth teeth 12D and the fifth teeth 12E passes through the connecting wire notch portion 24b located between the fifth teeth 12E and the sixth teeth 12F in the circumferential direction. , Are drawn out to the outside in the radial direction of the outer wall portion 24. The inner passage portion 42b pulled out to the outside in the radial direction of the outer wall portion 24 is connected to the outer passage portion 42a. The outer passage portion 42a extends to one side in the circumferential direction along the outer surface 24p of the outer wall portion 24 and is connected to the lead-in portion 42d. The lead-in portion 42d of the W-phase coil wire 40W is pulled inward in the radial direction of the outer wall portion 24 through the crossover wire notch portion 24b located outside in the radial direction of the sixth tooth 12F. The connecting wire 42 of the W-phase coil wire 40W is wound around the sixth tooth 12F at the end of the lead-in portion 42d and is connected to the W-phase coil 50W.
In the present embodiment, the U-phase, V-phase, and W-phase coil wires are delta connected.
As shown in FIG. 6, when the first teeth 12A are viewed from the inside in the radial direction, the U-phase coil wire 40U is wound around the first teeth 12A counterclockwise. When the fourth teeth 12D are viewed from the inside in the radial direction, the U-phase coil wire 40U is wound around the fourth teeth 12D counterclockwise.
As shown in FIG. 7, when the fifth tooth 12E is viewed from the inside in the radial direction, the V-phase coil wire 40V is wound around the fifth tooth 12E counterclockwise. When the second teeth 12B are viewed from the inside in the radial direction, the V-phase coil wire 40V is wound around the second teeth 12B counterclockwise.
As shown in FIG. 8, when viewed from the inside in the radial direction, the W-phase coil wire 40W is wound counterclockwise around the third tooth 12C. When viewed from the inside in the radial direction, the W-phase coil wire 40W is wound around the sixth teeth 12F in the counterclockwise direction.
In this embodiment, the direction in which the V-phase coil wire 40V is wound around the teeth 12E and 12B is the same as the direction in which the U-phase coil 40U is wound around the teeth 12A and 12D. The direction in which the W-phase coil wire 40W is wound around the teeth 12C and 12F is the same as the direction in which the V-phase coil wire 40V is wound around the teeth 12E and 12B.
In the present embodiment, the coil wire forming each phase is wound around each tooth counterclockwise. In other words, in each tooth, the coil wires forming the first phase, the second phase, and the third phase are wound in the same direction.
With the above configuration, the starting point lead line 41A and the ending point lead line 41B extending from the U-phase coil 50U, the starting point leading line 41A and the ending point leading line 41B extending from the V-phase coil, and the starting point leading line 41A and the ending point extending from the W-phase coil. The lead lines 41B are drawn to the same side in the axial direction (in the present embodiment, the upper side in the axial direction). As a result, each crossover wire, each start point leader line 41A, and each end point leader line 41B are located on the same side in the axial direction (in the present embodiment, the axial direction upper side).
The starting point lead-out line 41A of the U-phase coil 50U and the ending point lead-out line 41B of the W-phase coil 50W are from a slot (first slot) that is a gap located between the first teeth 12A and the sixth teeth 12F. , Pulled out. That is, the starting point lead wire 40A of the U-phase coil and the ending point lead wire 41B of the W-phase coil are drawn from the same slot (first slot).
The end point leader line 40B of the V-phase coil 50V and the start point leader line 41A of the W-phase coil 50W are led out from a slot (second slot) located between the second teeth 12B and the third teeth 12V. That is, the end point lead line 41B of the V-phase coil 50V and the start point lead line 41A of the W-phase coil are led out from the same slot (second slot).
The end-point leader line 41B of the U-phase coil 50U and the start-point leader line 41A of the V-phase coil 50V are led out from the slot (third slot) located between the fourth teeth 12D and the fifth teeth 12E. Be done. That is, the U-phase coil end point lead wire 41B and the V-phase coil start point lead wire 41A are drawn from the same slot (third slot).
In other words, the slot from which the end point lead wire of the coil forming one of the U-phase, V-phase, and W-phase forms another one of the U-phase, V-phase, and W-phase. It is the same as the slot from which the starting point leader of the coil is drawn.
The plurality of slots are the first slot from which the end point lead wire 41B of the U-phase coil 50U and the start point lead wire 41A of the V-phase coil 50V are drawn, and the start point lead wire 41A of the U-phase coil 50U and the end point of the W-phase coil 50W. It includes a second slot from which lead wire 41B is drawn out, and a third slot from which end lead wire 41B of V-phase coil 50V and start point lead wire 41A of W-phase coil 50W are drawn.
In other words, the starting lead line 41A of the first phase is drawn from the same slot as the ending lead line 41B of the third phase. The second-phase start-point leader line 41A is led out from the same slot as the first-phase end-point leader line 41B. 41 A of starting-point leader lines of 3rd phase are drawn out from the same slot as the ending-point leader line 41B of 2nd phase.
The slot from which the U-phase coil start point lead wire 41A and the W-phase coil end point lead wire 41B are drawn is the slot from which the V-phase coil end point lead wire 41B and the W-phase coil start point lead wire 41A are drawn, and the U-phase coil. The slots from which the coil end point lead-out line 41B and the V-phase coil start point lead-out line 41A are drawn out are arranged every other one of the plurality of slots in the circumferential direction.
Thereby, when connecting each starting point leader line 41A and each end point leader line 41B, compared with the case where the starting point leader line 41A of one phase and the ending point leader line 41B of another phase are drawn from different slots, The connection structure can be simplified and the manufacturing cost can be reduced. Further, with the structure described above, the shape of the bus bar to which the starting point leader line 41A and the end point leader line 41B are connected can be simplified, and the manufacturing cost can be reduced.
In addition, in this embodiment, each crossover wire 42 is located on the axial upper side of the stator 3. Each of the start-point leader line 41A and the end-point leader line 41B is located above the stator 3 in the axial direction. That is, each crossover wire 42, the start-point leader line 41A, and the end-point leader line 41B are located on one axial side of the stator 3 (the same axial side). Thereby, for example, an operator or the like can connect the U-phase coil wire 40U, the V-phase coil wire 40V, the W-phase coil wire 40W, the connection with the bus bar, and the drawing of each coil wire on the same side in the axial direction of the stator 3. It can be turned and the stator 3 can be easily manufactured.

<Manufacturing method>
Next, a method of manufacturing the stator 3 will be described. The manufacturing method of the stator 3 mainly includes a step of mounting the insulator 20 on the stator core 10 and a winding step. The winding step is a step of forming the coil 50 by winding the plurality of coil wires 40 around the plurality of teeth 12 via the connecting wires 42, respectively.

The winding step is performed in the order of the U-phase coil wire 40U, the V-phase coil wire 40V, and the W-phase coil wire 40W. In the winding step, the start-point leader line 41A and the end-point leader line 41B are passed through the connecting wire notch portion 24b of the outer wall portion 24 and led out to the outside in the radial direction.

After the winding process of the three coil wires 40 is completed, a process of raising the lead wires 41 (the start point lead wire 41A and the end point lead wire 41B) of the coil wires 40 of each phase to the upper side is performed. By this step, the leader line 41 is extended along the axial direction. A power supply device is connected to the lead wire 41 extending upward from the coil 50 via a conductive member such as a bus bar.

The crossover wire 42 of the coil wire 40 extends along the outer surface 24p of the outer wall portion 24 in the circumferential direction so as not to hinder the path of the winding machine when winding the other coil 50 that is sequentially wound. The passing portion 42a is configured.

Here, attention is paid to the winding process of the U-phase coil wire 40U and the W-phase coil wire 40W. In the manufacturing method of the present embodiment, the V-phase coil wire 40V is wound after the U-phase coil wire 40U is wound. That is, the U-phase coil wire 40U is a coil wire that is wound first (first coil wire), and the W-phase coil wire 40W is a coil wire that is wound later (second coil wire).

In the winding process of the U-phase coil wire 40U, the winding machine (or the winding operator) connects the crossover wire 42 of the U-phase coil wire 40U to the outer surface 24p of the outer wall portion 24 radially outside the outer wall portion 24. Let it go. As a result, the crossover wire 42 of the U-phase coil wire 40U is provided with the outer passage portion 42a.

Further, in the winding process of the V-phase coil wire 40V, the winding machine causes the crossover wire 42 of the V-phase coil wire 40V to extend along the outer side surface 24p of the outer wall portion 24 on the outer side in the radial direction of the outer wall portion 24. The radially inner side of the outer wall portion 24 is linearly extended in a region where the phase coil wire 40U overlaps the lead wire 41 in the radial direction. As a result, the connecting wire 42 of the V-phase coil wire 40V is provided with the outer passage portion 42a and the inner passage portion 42b. Further, the inside passage portion 42b of the V-phase coil wire 40V passes through the inside in the radial direction of the lead wire 41 of the other coil wire 40 (U-phase coil wire 40U in the present embodiment).

In the conventional structure, the crossover of the coil wire does not have the inner passage portion 42b of the present embodiment. The crossover wire of the conventional structure passes outside the outer wall portion over substantially the entire length, and passes directly above the lead wire of the coil wire that has been wound before. Therefore, when the lead wire is started after the winding step, the lead wire comes into contact with the crossover wire of another coil wire. Therefore, there is a possibility that the insulation between the coil wires of other phases is not sufficiently secured. In addition, there has been a problem that the drawn-out lead wire spreads outward in the radial direction, and the radial dimension of the stator increases.

According to the present embodiment, the crossover wire 42 of the V-phase coil wire 40V to be wound later passes inside the outer wall portion 24 in the radial direction in the region where the crossover wire 42 of the U-phase coil wire 40U to be wound first overlaps in the radial direction. .. Therefore, even if the lead wire 41 of the U-phase coil wire 40U is raised after the winding step, it does not interfere with the crossover wire 42 of the V-phase coil wire 40V. This ensures insulation between the U-phase coil wire 40U and the V-phase coil wire 40V. In addition, it is possible to prevent the raised lead wire 41 from spreading outward in the radial direction, and to prevent enlargement of the radial dimension of the stator 3.

Here, the relationship between the coil wire 40 that is wound first and the coil wire 40 that is wound later has been described, focusing on the U-phase coil wire 40U and the V-phase coil wire 40V. However, when the W-phase coil wire 40W is focused on as the coil wire 40 to be wound later, the same applies to the relationship with the coil wire to be wound earlier (the U-phase coil wire 40U and the V-phase coil wire 40V).

In the winding step, the coil wire 40 is wound around the tooth 12 and then temporarily pulled out to the outside of the outer wall portion 24 in the radial direction. That is, in the winding step, the coil wire 40 is not directly pulled out as the inner passage portion 42b after being wound around the tooth 12. Further, in the winding step, the coil wire 40 is once pulled out to the outside in the radial direction of the outer wall portion 24 after forming the inner passage portion 42b, and is further wound around the tooth 12. That is, in the winding step, the coil wire 40 is not directly wound around the tooth 12 from the inner passage portion 42b. Therefore, according to the present embodiment, the inner passage portion 42b is connected to the outer passage portion 42a at both ends.

Therefore, when the coil wire 40 is wound around the tooth 12, the inner passage portion 42b does not obstruct the path of the winding machine. Further, the inner passage portion 42b is wound around the outer wall portion 24 at both ends thereof. Therefore, the inner passage portion 42b can be extended in the direction orthogonal to the vertical direction. As a result, the contact between the inner passage portion 42b and the coil 50 located immediately below the inner passage portion 42b can be suppressed, and the performance of the stator 3 can be stabilized.

According to the present embodiment, the crossover wires 42 of the V-phase coil wire 40V and the W-phase coil wire 40W each have an inner passage portion 42b. Since the inner passage portion 42b extends linearly, the crossover wire 42 can be shortened as compared with a case where the inner passage portion 42b passes through the outer side of the outer wall portion 24 in the radial direction. As a result, the weight of the stator 3 and the cost of the coil wire 40 can be reduced.

(Kakebe)
FIG. 9 is a perspective view of a part of the crossover wire 42 of the V-phase coil wire 40V. Although the configuration of the crossover wire 42 of the V-phase coil wire 40V will be described here, the same configuration can be adopted for the W-phase coil wire 40W having the inner passage portion 42b as with the V-phase coil wire 40V.

A hook 25 is provided on the outer wall 24. As described above, the crossover wire 42 of the V-phase coil wire 40V has the inner passage portion 42b connected to the outer passage portion 42a at both ends. The inner passage portion 42b is routed radially inward of the outer wall portion 24 at the boundary with the outer passage portion 42a. A crossover 42 is hung on the hanging portion 25 at the boundary between the outer passage portion 42a and the inner passage portion 42b.

In the winding step, tension is applied to the crossover wire 42 so that the crossover wire 42 does not become loose. The crossover wire 42 is hung on the hanging portion 25 at the boundary between the outer passage portion 42a and the inner passage portion 42b, so that the outer passage portion 42a is prevented from moving radially inward of the outer wall portion 24, and the outer wall portion It is possible to extend along the radially outer side of 24.

The outer wall portion 24 has an upper end surface 24s facing upward. The upper end surface 24s is provided with a first region 26a and a second region 26b having different heights, and a step portion 27 connecting the first region 26a and the second region 26b. The first area 26a is higher than the second area 26b. In the present embodiment, the step portion 27 constitutes the hanging portion 25. That is, the crossover wire 42 extends along the circumferential direction in the outer passage portion 42a and is hung on the step portion 27, so that the crossover wire 42 is routed radially inward of the outer wall portion 24 as the inner passage portion 42b.

According to the present embodiment, the outer wall portion 24 is provided with the first area 26a and the second area 26b having different heights, and the step portion 27 between the first area 26a and the second area 26b forms the hanging portion 25. Constitute. Therefore, the crossover wire 42 can be hooked on the hook 25 without significantly moving the nozzle of the winding machine in the vertical direction, and the time of the winding step can be shortened. Further, since the second region 26b is lower than the first region 26a, it is possible to prevent the nozzle of the winding machine from coming into contact with the outer wall portion 24 in the second region 26b.

(Modification 1 of hanging part)
Next, the hanging portion 125 of the modified example 1 that can be adopted in the present embodiment will be described based on FIG.
The same components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Similar to the above-described embodiment, the crossover 42 is hooked on the hanging portion 125 of the present modification at the boundary between the outer passage portion 42a and the inner passage portion 42b. The hanging portion 125 of this modification is provided on the upper end surface 24s of the outer wall portion 24. In the present modification, the hook 125 is the first protrusion 127 that projects upward from the upper end surface 24s of the outer wall portion 24. That is, the first protrusion 127 constitutes the hanging portion 125.

The crossover wire 42 extends along the circumferential direction in the outer passage portion 42a and is hung on the first protrusion 127, so that the crossover wire 42 is routed radially inward of the outer wall portion 24 as the inner passage portion 42b. The connecting wire 42 extends along the circumferential direction in the outer passage portion 42a, is hung on the first protrusion 127, and is routed radially inward of the outer wall portion 24 as the inner passage portion 42b.

(Modification 2 of hanging part)
Next, the hanging portion 225 of the modified example 2 that can be adopted in the present embodiment will be described based on FIG. 11. The same components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Similar to the above-described embodiment, a crossover 42 is hooked on the hooking portion 225 of this modification at the boundary between the outer passage portion 42a and the inner passage portion 42b. The hanging portion 225 of the present modification is provided on the outer side surface 24p of the outer wall portion 24. In the present modification, the hook portion 225 is the second protrusion 227 that projects radially outward from the outer surface 24p of the outer wall portion 24. That is, the second protrusion 227 constitutes the hanging portion 125.

The crossover wire 42 extends along the circumferential direction in the outer passage portion 42a and is hung on the second protrusion 227, so that the crossover wire 42 is routed radially inward of the outer wall portion 24 as the inner passage portion 42b. The crossover wire 42 extends along the circumferential direction in the outer passage portion 42a, is hung on the second protrusion 227, and is routed radially inward of the outer wall portion 24 as the inner passage portion 42b.

Although the embodiment of the present invention and the modified example thereof have been described above, each configuration and the combination thereof in the embodiment and the modified example are examples, and within the scope not departing from the spirit of the present invention, addition of the configuration, Omissions, substitutions and other changes are possible. The present invention is not limited to the embodiments.

For example, the stator 3 of the above-described embodiment has six coils 50. However, the number of coils 50 of the stator 3 is not limited to this embodiment. In the above embodiment, the number of slots is six. However, the number of slots is not limited to this embodiment. The rotor 2 of the above-described embodiment has eight magnetic poles. However, the number of magnetic poles is not set to eight.
In the motor according to the above-described embodiment, the ratio of the number S of slots to the number P of magnetic poles is 3:4. However, in the above configuration, the ratio of the number S of slots to the number P of magnetic poles may be 3:4. That is, when the natural number excluding 0 is n (n=1, 2, 3,...), the ratio of the number S of slots to the number P of magnetic poles is 3n:4n (for example, 3:4, 6). :8, 9:12, 12;16, 15:20, 18:24, 21:28, 24:32, 27:36, 30:40,. More preferably, n=2 or more (that is, the ratio of the number of poles to the number of slots is 6:8, 9:12,...).
The outer diameter of the stator may be, for example, 38 mm, 47 mm, 62 mm, 85 mm or the like, and is not particularly limited.
Further, in the above-described embodiment, one coil wire 40 configures two coils 50. However, one coil wire 40 may form three or more coils. The lead wire extended from the coil may be connected to a power supply device or the like without using a conductive member such as a bus bar.
In the above-described embodiment, two coils are connected in series in each of the U phase, V phase, and W phase. However, three or more (at least two or more) coils may be connected in series in each of the U-phase, V-phase, and W-phase.
In the above-described embodiment, all the coil wires are wound around the tooth in the counterclockwise direction when viewed from the central axis J side. However, all the coil wires may be wound around the teeth in the clockwise direction when viewed from the central axis side.
In the above-described embodiment, each connecting line, each starting point lead line 41A, and each ending point lead line 41B are located on the upper side in the axial direction. That is, each connecting line, each starting point lead line 41A, and each ending point lead line 41B are located on the same side in the axial direction. However, each crossover wire may be routed around one side in the axial direction of the stator, and each start point leader line 41A and each end point leader line 41B may be located on the other side in the axial direction. In this case, it is possible to prevent the crossover wire from coming into contact with each lead wire and causing a short circuit.

DESCRIPTION OF SYMBOLS 1... Motor, 2... Rotor, 3... Stator, 10... Stator core, 11... Core back, 12... Teeth, 20... Insulator, 21... Base part, 24... Outer wall part, 24a... Lead wire notch part (notch part), 24b... Crossover wire notch (notch), 24c... First protrusion (convex), 24d... Second protrusion (convex), 24p... Outer surface, 24s... Upper end surface, 25, 125, 225... Hanging part, 26a... 1st area|region, 26b... 2nd area|region, 27... Step part, 40... Coil wire, 40U... U phase coil wire (1st coil wire), 40V... V phase coil wire (2nd) Coil wire), 40W... W phase coil wire, 41... Lead wire, 42... Crossover wire, 42a... Outer passage portion, 42b... Inner passage portion, 42A... Upper crossover wire, 42B... Lower crossover wire, 50... Coil Reference numeral 127... First protrusion, 227... Second protrusion, 24bA... Upper notch (first notch), 24ba... Bottom, 24ca, 24da... Bottom, 24bB... Lower notch (second notch), J... central axis

Claims (19)

A three-phase motor,
A stator core having an annular core back centered on a central axis extending along the up-down direction and a plurality of teeth extending radially inward from the core back;
A plurality of coil wires wound around the teeth,
A rotor having a rotor magnet and rotatable with respect to the stator;
Equipped with
The coil wires are
A plurality of coils wound around the teeth,
A pair of lead wires located at the ends of the coil wire and extending from the coil;
Have
The pair of leader lines includes a start point leader line and an end point leader line,
Slots are located between the teeth adjacent to each other in the circumferential direction,
The ratio of the number of magnetic poles of the rotor to the number of slots is 4:3,
The coil constitutes at least one phase of U phase, V phase, and W phase,
The slot from which the end-point leader line of the coil that forms one of the U-phase, the V-phase, and the W-phase is drawn out from the U-phase, the V-phase, and the W-phase. Is the same as the slot from which the starting-point leader line of the coil that constitutes one phase of
motor. The plurality of coils in which any one of the three-phase coil wires is wound around each tooth is arranged in the circumferential direction in the order of the U-phase, the V-phase, and the W-phase. motor. The number of slots located between the teeth adjacent to each other in the circumferential direction is 6 or more,
A plurality of the coils in which any one of the plurality of coil wires is wound around each tooth is repeatedly arranged in the circumferential direction in the order of the U-phase, the V-phase, and the W-phase.
The motor according to claim 1 or 2. The motor according to claim 3, wherein the number of the slots is 12 or more. The motor according to claim 3 or 4, wherein at least two of the coils are connected in series in each of the U phase, the V phase, and the W phase. The motor according to claim 5, wherein the plurality of coils are all connected in series in each of the U-phase, the V-phase, and the W-phase. The motor according to any one of claims 1 to 6, wherein the coil wires of the coils forming the U phase, the V phase, and the W phase are delta connected. The motor according to any one of claims 1 to 7, wherein all the coil wires are wound around the teeth in the same direction when viewed from the central axis side. A plurality of said slots,
A first slot from which the U-phase end-point leader line and the V-phase start-point leader line are led out;
A second slot from which the U-phase start point leader line and the W-phase end point leader line are drawn;

A third slot from which the end point leader line of the V phase and the start point leader line of the W phase are drawn out,
The motor according to claim 1, which comprises: The motor according to any one of claims 1 to 9, wherein the coil wire is wound around the teeth by concentrated winding. The stator includes an insulator attached to the stator core,
The stator core has an annular core back centered on a central axis,
The teeth extend radially inward from the core back,
The coil wire is wound around the tooth via the insulator,
The insulator is
A base portion surrounding the outer peripheral surface of the tooth,
An outer wall portion located immediately above the core back and extending along the circumferential direction,
Have
The coil wire is configured by being wound around the teeth by concentrated winding,
Each of the plurality of coil wires has a connecting wire connecting the plurality of coils to each other,
Each of the crossover wires of the plurality of coil wires has an outer passage portion that extends along the outer side surface of the outer wall portion on the radially outer side of the outer wall portion, and the crossover wire of at least one of the coil wires is An inner passage portion extending linearly inward in the radial direction of the outer wall portion and connected to the outer passage portion at both ends,
The inner passage portion is located radially inward of the lead wire of the other coil wire,
The motor according to any one of claims 1 to 9. The motor according to claim 11, wherein the outer wall portion has a hook portion to which the crossover wire is hung at a boundary portion between the outer passage portion and the inner passage portion. The upper end surface of the outer wall portion has a first region and a second region having different heights, and a step portion connecting the first region and the second region,
The step portion constitutes the hanging portion,
The motor according to claim 12. A first protrusion protruding upward is provided on an upper end surface of the outer wall portion,
The first protrusion constitutes the hanging portion,
The motor according to claim 12. A second protrusion is provided on an outer surface of the outer wall portion so as to project radially outward,
The second protrusion constitutes the hook portion,
The motor according to claim 12. The outer surface of the outer wall portion is provided with a convex portion that projects radially outward,
The outer passage portion is located below the convex portion,
The motor according to any one of claims 11 to 15. The outer wall portion is provided with a cutout portion extending downward from the upper end,
The cutout portion has a bottom surface facing upward,
The crossover wire is drawn to the outside of the outer wall portion through the cutout portion,
The motor according to any one of claims 11 to 16. The motor according to any one of claims 11 to 17, wherein the start-point leader line, the end-point leader line, and the connecting line are located on the same side of the stator. The start point leader line and the end point leader line are located on the upper side in the axial direction,
The motor according to any one of claims 11 to 17, wherein the crossover wire is located axially below the stator.

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