WO2019004117A1

WO2019004117A1 - Stator and motor

Info

Publication number: WO2019004117A1
Application number: PCT/JP2018/023989
Authority: WO
Inventors: 英明内勢; 貴之右田; 宏北垣; 辰也伊藤; 晃弘大北
Original assignee: 日本電産株式会社
Priority date: 2017-06-29
Filing date: 2018-06-25
Publication date: 2019-01-03

Abstract

This stator is provided with a stator core, an insulator, and a plurality of coil wires. The insulator has an outer wall portion that is located just above the core back and extends in the circumferential direction. A first cutout that extends from the upper end to the lower side is provided in the outer wall portion. A first protrusion that protrudes radially outward is provided to the outer side surface of the outer wall portion. A bottom surface directed toward the upper side of the first cutout is located on the upper side relative to the lower surface of the first protrusion. A pair of jumper wires among the coil wires are lined up vertically along the outer side surface of the outer wall portion on the radially outer side of the outer wall portion, and extend in the circumferential direction. Of the pair of jumper wires that are lined up vertically, one is determined as an upper-side jumper wire and the other that passes along the lower side of the upper-side jumper wire is determined as a lower-side jumper wire. The upper-side jumper wire passes through the first cutout and is drawn radially outward of the outer wall portion. The lower-side jumper wire passes just below the first protrusion.

Description

Stator and motor

The present invention relates to a stator and a motor.

Generally, a motor coil is configured by winding a coil wire around the teeth of a stator core. When winding one coil wire around a plurality of teeth, a connecting wire connecting the coils is drawn on the upper side of the coil. In order that the crossover of the coil wire wound first in the winding process does not disturb the path of the coil wire wound later, the crossover is drawn around the radial outside of the coil. For example, Patent Document 1 discloses a structure in which a protrusion is provided on the outer side in the radial direction of the coil, and a crossover is made along the protrusion.

JP, 2014-108007, A

When a plurality of connecting wires are drawn along the circumferential direction on the radially outer side of the coil, the connecting wires may be in contact with each other. Further, in the case of suppressing the interference between the crossovers by inserting the crossovers into the grooves, there is a problem that the assembly process becomes complicated and the manufacturing cost of the stator increases.

An object of the present invention is to provide a stator and a motor capable of suppressing the contact between the crossovers without complicating the assembly process in view of the above-mentioned circumstances.

One aspect of the stator of the present invention is a stator core having an annular core back centered on a central axis extending along 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. Each of the plurality of coil wires includes a plurality of coils wound around the teeth by concentrated winding and a crossover wire connecting the plurality of coils. The insulator has a base surrounding the outer peripheral surface of the teeth, and an outer wall portion located immediately above the core back and extending along the circumferential direction. The outer wall portion is provided with a first notch extending downward from the upper end. The outer surface of the outer wall portion is provided with a first convex portion protruding radially outward. The bottom surface facing the upper side of the first notch is located above the lower surface of the first protrusion. The crossovers of the pair of coil wires extend in the circumferential direction, lined up and down along the outer side surface of the outer wall portion and radially outward of the outer wall portion. One of the pair of crossovers arranged in the vertical direction is an upper crossover, and the other passing below the upper crossover is a lower crossover. The upper connecting wire is drawn radially outward of the outer wall through the first notch. The lower connecting wire passes immediately below the first protrusion.

One aspect of the motor of the present invention includes the above-described stator, and a rotor that faces the stator with a gap in the radial direction and faces the stator and rotates around the central axis.

According to one aspect of the present invention, it is possible to provide a stator and a motor that can suppress contact between crossover wires without complicating the assembly process.

FIG. 1 is a cross-sectional view of a motor according to one embodiment. FIG. 2 is a cross-sectional view of a stator of an embodiment. FIG. 3 is a perspective view of a stator of one embodiment. FIG. 4 is an enlarged view of a part of FIG. 3. FIG. 5 is a plan view of the stator of one embodiment. FIG. 6 is a diagram showing the procedure of winding the U-phase coil. FIG. 7 is a diagram showing a procedure of winding of the V-phase coil. FIG. 8 is a diagram showing the procedure of winding the W-phase coil. FIG. 9 is a perspective view showing the hook of one embodiment. FIG. 10 is a perspective view showing the hook portion of the first modification. FIG. 11 is a perspective view showing the hook portion of the second modification.

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

In each figure, an XYZ coordinate system is shown as appropriate. In the present specification, the Z-axis direction is a vertical direction with the positive side at the upper side and the negative side at the lower side. A central axis J appropriately shown in each drawing is an imaginary line which 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”, and the radial direction centering on the central axis J is simply referred to as “radial direction”. The circumferential direction centered on is simply referred to as "circumferential direction". In each figure, the circumferential direction is appropriately indicated by an arrow θ.

Moreover, 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". Further, the side advancing clockwise as viewed from the upper side to the lower side in the circumferential direction, that is, the side advancing in the direction of the arrow θ is referred to as “one side in the circumferential direction”. The side advancing in the counterclockwise direction as viewed from the upper side to the lower side in the circumferential direction, that is, the side advancing in the direction opposite to the direction of the arrow θ is referred to as “the other side in the circumferential direction”.

The vertical direction, the upper side and the lower side are simply names for describing the arrangement relationship etc. of each part, and the actual arrangement relationship etc. is an arrangement relationship etc. other than the arrangement relationship etc. shown by these names May be

<Motor>

FIG. 1 is a cross-sectional view of a motor 1 of the present embodiment. The motor 1 of the present embodiment is a three-phase alternating current motor. Further, the motor 1 of the present embodiment is an inner rotor type motor. The application of the motor 1 of the present embodiment is not particularly limited. The motor 1 is mounted on, for example, an electric pump, an electric power steering, and the like.

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 vertical direction.

The housing 5 is in the form of a tube having a bottom. The housing 5 accommodates the rotor 2, the stator 3, the bearing holder 4 and the pair of bearings 6 therein. 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 around 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 2 a is rotatably supported around the central axis J by a plurality of bearings 6. The shaft 2a is not limited to the above cylindrical shape, but may be, for example, a cylindrical shape.

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

The magnet 2c is fixed to the outer peripheral surface of the rotor core 2b. The magnet 2 c radially faces the teeth 12 of the stator 3. The magnet 2c of the present embodiment is an annular magnet. In the magnet 2c, N poles and S poles are alternately arranged along the circumferential direction. The rotor 2 may have a plurality of magnets arranged along the circumferential direction. In this case, the magnet whose radially outer side is the N pole and the magnet whose radially outer side is the S pole are alternately arranged in the circumferential direction.

The rotor 2 of this embodiment is a SPM (Surface Permanent Magnet) type rotor in which the magnets 2 c are disposed on the outer peripheral surface of the rotor core 2 b. However, the rotor 2 may be an IPM (Interior Permanent Magnet) type rotor in which a magnet is embedded inside the rotor core. The rotor core 2b and the magnet 2c may be housed inside a cylindrical rotor cover.

<Stator>

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

<Stator core>

The stator core 10 surrounds the rotor 2 at the radially outer side of the rotor 2. The stator core 10 is configured, for example, by laminating a plurality of electromagnetic steel plates in the axial direction. Thus, the stator core 10 extends in the axial direction with a uniform cross section. The stator core 10 of the present embodiment is an integrated stator core which is not divided along the circumferential direction.

FIG. 2 is a cross-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 teeth 12 via the insulator 20. Therefore, the coil wire 40 passes between the pair of teeth 12 adjacent in the circumferential direction.

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

<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. The upper piece 20A and the lower piece 20B each have a substantially annular shape centering on the central axis J. The upper piece 20A is attached to the stator core 10 from the upper side. The lower piece 20B is attached to the stator core 10 from the lower side. The upper piece 20A surrounds the upper end surface of the core back 11 and the upper regions of both end surfaces of the teeth 12 in the circumferential direction. The lower piece 20B surrounds the lower end surface of the core back 11 and the lower regions of both end surfaces of the teeth 12 in the circumferential direction. In the insulator 20, the upper piece 20 A and the lower piece 20 B are attached to the stator core 10 from above and below, thereby surrounding the outer peripheral surface of the teeth 12.

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

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

The base 21 surrounds the outer peripheral surface of the teeth 12. The base 21 is provided in the same number as the teeth 12. In the present 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 teeth 12. However, as long as the base 21 can ensure insulation between the teeth 12 and the coil wire 40, a part of the outer peripheral surface of the teeth 12 may be exposed.

The inner wall portion 23 is provided in a plurality on the insulator 20. Each inner wall portion 23 overlaps the umbrella portion 13 as viewed in the axial direction. The inner wall portion 23 extends along the circumferential direction. The inner wall portion 23 is provided in 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 as many as the teeth 12, respectively. The inner wall portion 23 of the upper piece 20 A is located immediately 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 radial inward movement of the coil wire 40 wound around the teeth 12.

The outer wall portion 24 has an annular shape centered on the central axis J. The outer wall portion 24 is provided to each of the upper piece 20A and the lower piece 20B. The outer wall portion 24 of the upper piece 20 A 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 directly 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 overlap the core back 11 when viewed from the axial direction.

The outer wall portion 24 extends along the circumferential direction. The outer wall portion 24 radially faces the inner wall portion 23. The outer wall portion 24 restricts the radially outward movement of the coil wire 40 wound around the teeth 12.

FIG. 3 is a perspective view of the stator 3. In addition, FIG. 3 is a figure which shows the state of the stator 3 immediately after performing a winding process. After the winding process, a process of raising the lead wire 41 in the axial direction is performed.

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

The lead wire notch 24 a opens upward and extends downward from the upper end surface of the outer wall portion 24. The lead wire notch 24 a penetrates in the radial direction. The outer wall portion 24 of the present embodiment is provided with five lead wire cutouts 24 a. The five lead wire notches 24 a are located radially outward of the coil 50.

The lead wire 41 extending from the coil 50 is passed through the lead wire notch 24 a in the winding process of the coil wire 40. The lead wire 41 is pulled out from the coil 50 in the radial direction by being passed through the lead wire notch 24a. As a result, the lead wire 41 does not protrude upward from the coil 50, and does not disturb the path of the coil wire 40 in the winding process. The lead wire 41 passed through the lead wire notch 24a is raised upward after the completion of the winding process.

In the present embodiment, the lead wire cutouts 24 a are not provided radially outside of the coil 50 wound last among the six coils 50. The leader 41 extending from the coil 50 to be wound last is drawn at the end of the winding process and does not disturb the path of the other coil wire 40. For this reason, it is not necessary to pass the lead wire 41 of the coil 50 to be wound finally to the lead wire notch 24a, and the lead wire notch 24a is not provided.

The crossover cut-out portion 24 b opens upward and extends downward from the upper end surface of the outer wall portion 24. The crossover notch 24b penetrates in the radial direction. The connecting wire 42 of the coil wire 40 passes through the connecting wire cutout 24b. That is, the connecting wire 42 is routed from the inside in the radial direction of the outer wall portion 24 to the outside in the radial direction via the connecting wire notch 24 b.

The first convex portion 24 c and the second convex portion 24 d are provided on the outer side surface 24 p facing the radially outer side of the outer wall portion 24. The first convex portion 24 c and the second convex portion 24 d protrude radially outward from the outer side surface 24 p of the outer wall portion 24. The first convex portion 24 c and the second convex portion 24 d are located radially outward of the outer wall portion 24 and above the coil wire 40 drawn along the outer side surface 24 p. The first convex portion 24 c and the second convex portion 24 d restrict the upward movement of the coil wire 40 and suppress the coil wire 40 from riding on the upper side of the outer wall portion 24.

As shown in FIG. 3, the connecting wires 42 of the plurality of coil wires 40 are wound around the outer surface 24 p of the outer wall portion 24. The plurality of crossovers 42 extend along the outer side surface 24 p radially outward of the outer wall portion 24. Among the plurality of crossover wires 42, the pair of crossover wires 42 extend in the up-down direction along the outer side surface 24p of the outer wall portion in the radial direction outside of the outer wall portion. The pair of crossovers 42 are respectively drawn to the outside in the radial direction of the outer wall portion 24 through the crossover notch portions 24 b.

Here, one of the pair of crossovers 42 extending in parallel in the vertical direction is positioned on the upper side as the upper crossover 42A, and the other positioned on the lower side is the lower crossover 42B. That is, the lower connecting wire 42B is located below the upper connecting wire 42A. Also, the crossover wire notch 24b through which the upper crossover wire 42A passes is referred to as an upper notch (first notch) 24bA, and the crossover wire notch 24b through which the lower crossover wire 42B passes is a lower notch (the first Cut portion 2) 24bB. In the following description, the first notch is referred to as the upper notch, and the second notch is referred to as the lower notch.

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

The first convex portion 24c has a lower surface 24ca facing downward. 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 notch 24bA and the lower notch 24bB and the lower surfaces 24ca and 24da of the first protrusion 24c and the second protrusion 24d are arranged at mutually different positions in the vertical direction. The vertical positions of the lower surface 24da of the second projection 24d, the bottom surface 24ba of the upper cutout 24bA, and the lower surface 24ca of the first projection 24c, and the lower cutout 24bB of the second projection 24d. It is in order of bottom 24ba.

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

The upper connecting wire 42A is drawn radially outward of the outer wall portion 24 through the upper notch 24bA. In addition, the upper connecting wire 42A is routed in the circumferential direction along the outer side surface 24p of the outer wall portion 24. The upper connecting wire 42A passes immediately below the second protrusion 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 connecting wire 42A may be in contact with the lower surface 24da of the second protrusion 24d. The upper connecting wire 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 connecting wire 42A between the second protrusion 24d and the bottom surface 24ba of the upper notch 24bA, the routing of the upper connecting wire 42A can be stabilized.

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

The lower connecting wire 42B is pulled out radially outward of the outer wall portion 24 through the lower notch portion 24bB. In addition, the lower connecting wire 42 B is routed in the circumferential direction along the outer side surface 24 p of the outer wall portion 24. The lower connecting wire 42B passes immediately below the first convex portion 24c. That is, when viewed in the vertical direction, the lower connecting wire 42B and the first convex portion 24c overlap each other. The lower connecting wire 42B may be in contact with the lower surface 24ca of the first protrusion 24c. The lower connecting wire 42B extends in the circumferential direction between the lower surface 24ca of the first protrusion 24c and the bottom surface 24ba of the lower notch 24bB in the vertical direction. According to the present embodiment, by arranging the lower connecting wire 42B between the first protrusion 24c and the bottom surface 24ba of the lower notch 24bB, the routing of the lower connecting wire 42B can be stabilized. Can.

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

In the present embodiment, since the upper connecting wire 42A passes through the upper cutout 24bA, it is difficult to move below the bottom surface 24ba of the upper cutout 24bA. In addition, since the lower connecting wire 42B passes immediately below the first convex portion 24c, the lower connecting wire 42B does not easily move upward from the lower surface 24ca of the first convex portion 24c. In the present embodiment, the bottom surface 24ba of the upper notch 24bA is located above the lower surface 24ca of the first protrusion 24c. Therefore, according to the present embodiment, the upper connecting wire 42A and the lower connecting wire 42B can be prevented from contacting each other.

In the present embodiment, the first convex portion 24c is disposed adjacent to the upper notch 24bA in the circumferential direction. That is, the first convex portion 24c is disposed in the vicinity of the upper side notch 24bA. Therefore, the first convex portion 24c suppresses the movement of the lower connecting wire 42B to the upper side, and the upper notch 24bA suppresses the movement of the lower connecting wire 42A to the lower side. According to the present embodiment, the upper connecting wire 42A and the lower connecting wire 42B are slackened and come in contact with each other by arranging the first convex part 24c and the upper side notch 24bA adjacent to each other in the circumferential direction. 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 teeth 12 via the insulator 20 to form a coil 50. The coil 50 is wound around the teeth 12 by concentrated winding. Three coil wires 40 are provided in the stator 3 of the present embodiment.

When the three coil wires 40 are distinguished from one another in the following description, they are respectively U-phase coil wire (first coil wire) 40 U, V-phase coil wire (second coil wire) 40 V and W-phase coil wire (Third coil wire) It is called 40W.

The three coil wires 40 are each positioned at an end of the plurality of (two in the present embodiment) coils 50, a connecting wire 42 connecting the plurality of coils 50, and the coil wire 40 and extend out from the coil 50 And a pair of lead wires 41. One of the pair of lead wires 41 is located at the winding start end of the coil wire 40, and the other is located at the winding end of the coil wire 40. In the following description, when the pair of leader lines 41 are distinguished from each other, one located at the winding start end is called a start leader line 41A and the other located at the winding end is called an end leader line 41B. In the present embodiment, the start point lead wire 41 A and the end point lead wire 41 B 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 teeth 12 positioned in the + Y direction (the direction of 12 o'clock) with respect to the central axis J are referred to as first teeth 12A. In addition, each of the teeth 12 is 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 the teeth 12 different from each other. 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 in the connecting wire 42. Further, the lead wires 41 are drawn from the two U-phase coils 50U, respectively.

The two V-phase coils 50V are configured by winding the V-phase coil wire 40V around teeth 12 different from each other. The two V-phase coils 50V are formed 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 in the connecting wire 42. Further, the lead wires 41 are drawn from the two V-phase coils 50V.

The two W-phase coils 50W are configured by winding the W-phase coil wire 40W around 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 connecting wire 42. Further, the lead wires 41 are drawn from the two W-phase coils 50W, respectively.

FIGS. 6 to 8 are diagrams showing the procedure of 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 inner side in the radial direction).

The three coil wires 40 are wound around the teeth 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 around the teeth 12 in a counterclockwise direction as viewed from the central axis J side.

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

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

The outer passing portion 42a extends in the circumferential direction. The outer passage portion 42 a extends along the outer side surface 24 p of the outer wall portion 24 radially outside the outer wall portion 24. U-phase coil wire 40U has one outer passage portion 42a. On the other hand, the V-phase coil wire 40V and the W-phase coil wire 40W have two outer passing 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 respectively connected to the outer passage portion 42a. The inner passage portion 42b passes through the connecting wire cutout 24b at both ends. Thus, the inner passage portion 42 b passes through the radially inner side of the outer wall portion 24. The inner passage portion 42b linearly extends between the pair of crossover notch portions 24b.

The introductory part 42d is connected with the edge part of the circumferential direction one side of the outer side passing part 42a. The lead-in portion 42 d is pulled in radially inward from the radially outer side of the outer wall portion 24 through the connecting wire notch 24 b 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 teeth 12A and then wound around the fourth teeth 12D. Thereby, U-phase coil wire 40U constitutes a pair of U-phase coils 50U. Starting point lead wire 41A extends from U-phase coil 50U wound around first teeth 12A. An end point lead wire 41B extends from the U-phase coil 50U wound around the fourth teeth 12D. As shown in FIG. 5, the start point lead wire 41A and the end point lead wire 41B of the U-phase coil wire 40U are drawn radially outward through the lead wire cutouts 24a.

As shown in FIG. 5, the pair of U-phase coils 50U are connected to each other via the connecting wire 42. From the U-phase coil 50U wound around the first teeth 12A, the lead-out portion 42c of the connecting wire 42 extends out. The lead-out portion 42c is drawn to the radially outer side of the outer wall portion 24 through the crossover wire notch 24b located radially outward of the first teeth 12A and is connected to the outer passage portion 42a.

In the outer passage portion 42a, the crossover wire 42 of the U-phase coil wire 40U extends circumferentially to one side along the outer surface 24p of the outer wall portion 24 located radially outward of the second teeth 12B and the third teeth 12C. Extend. The crossover wire 42 of the U-phase coil wire 40U is pulled in radially inward of the outer wall portion 24 through the crossover wire notch portion 24b located radially outward of the fourth tooth 12D in the introductory portion 42d. 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 teeth 12E and then wound around the second teeth 12B. Thus, 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. An end point lead wire 41B extends from the V-phase coil 50V wound around the second teeth 12B. As shown in FIG. 5, the start point lead wire 41A and the end point lead wire 41B of the V-phase coil wire 40V are drawn radially outward through the lead wire notch 24a.

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

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

The inner passage portion 42b drawn inward in the radial direction of the outer wall portion 24 passes straight above the first teeth 12A in a straight line. The inner passing portion 42b of the V-phase coil wire 40V passes immediately above the U-phase coil 50U wound around the first teeth 12A. That is, a part of the inner passing portion 42b of the V-phase coil wire 40V overlaps the coil 50 (in the present embodiment, the U-phase coil 50U), as viewed from the axial direction. In addition, the inner passage portion 42b is located radially inward of the start point lead wire 41A which extends from the U-phase coil 50U wound around the first teeth 12A.

The inner passage portion 42b passing immediately above the first teeth 12A passes through the crossover wire notch 24b located between the first teeth 12A and the second teeth 12B in the circumferential direction, and the diameter of the outer wall portion 24 Pulled out in the direction. The inner passage portion 42b drawn radially outward of the outer wall portion 24 is connected to the outer passage portion 42a. The outer passage portion 42 a extends along one side in the circumferential direction along the outer side surface 24 p of the outer wall portion 24 and is connected to the lead-in portion 42 d. The lead-in portion 42d of the V-phase coil wire 40V is drawn radially inward of the outer wall portion 24 through the crossover wire notch portion 24b located radially outward of the second tooth 12B. The connecting wire 42 of the V-phase coil wire 40V is wound around the second teeth 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 teeth 12C and then wound around the sixth teeth 12F. Thereby, W phase coil wire 40W constitutes a pair of W phase coils 50W. A starting point lead wire 41A extends from the W-phase coil 50W wound around the third teeth 12C. An end point lead wire 41B extends from the W-phase coil 50W wound around the sixth tooth 12F. As shown in FIG. 5, the starting point lead wire 41A 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 drawn upward.

As shown in FIG. 5, the pair of W-phase coils 50 W are connected via the connecting wire 42. From the W-phase coil 50W wound around the third teeth 12C, the lead-out portion 42c of the connecting wire 42 extends out. The lead-out portion 42c is drawn to the radially outer side of the outer wall portion 24 through the crossover wire notch portion 24b located radially outward of the third tooth 12C and is connected to the outer 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 is pulled in radially inward of the outer wall portion 24 through the crossover wire notch portion 24b located between the third tooth 12C and the fourth tooth 12D in the circumferential direction.

The inner passage portion 42b drawn radially inward of the outer wall portion 24 linearly passes immediately above the fourth teeth 12D and the fifth teeth 12E. The inner passage portion 42b of the W-phase coil wire 40W passes immediately above the U-phase coil 50U wound around the fourth teeth 12D and the V-phase coil 50V wound around the fifth teeth 12E. That is, a part of the inner passing portion 42b of the W-phase coil wire 40W overlaps the coil 50 (in the present embodiment, the U-phase coil 50U and the V-phase coil 50V) as viewed in the axial direction. The inner passage portion 42b is located radially inward of the end point lead wire 41B extending from the U-phase coil 50U wound around the fourth tooth 12D. Further, the inner passage portion 42b is located radially inward of the start point lead wire 41A which extends from the V-phase coil 50V wound around the fifth tooth 12E.

The inner passage portion 42b passing immediately above the fourth teeth 12D and the fifth teeth 12E passes through the crossover notch 24b located between the fifth teeth 12E and the sixth teeth 12F in the circumferential direction. , And radially outward of the outer wall portion 24. The inner passage portion 42b drawn radially outward of the outer wall portion 24 is connected to the outer passage portion 42a. The outer passage portion 42 a extends along one side in the circumferential direction along the outer side surface 24 p of the outer wall portion 24 and is connected to the lead-in portion 42 d. The lead-in portion 42d of the W-phase coil wire 40W is drawn radially inward of the outer wall portion 24 through the crossover wire notch portion 24b located radially outward of the sixth tooth 12F. The connecting wire 42 of the W-phase coil wire 40W is wound around the sixth teeth 12F at the end of the lead-in portion 42d and is connected to the W-phase coil 50W.

<Manufacturing method>

Next, a method of manufacturing the stator 3 will be described. The method of manufacturing the stator 3 mainly includes a step of attaching the insulator 20 to the stator core 10, and a winding step. The winding step is a step of winding the plurality of coil wires 40 around the plurality of teeth 12 via the connecting wires 42 to configure the coil 50.

The winding process 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 process, the start point lead wire 41A and the end point lead wire 41B pass through the connecting wire notch 24b of the outer wall portion 24 and are drawn radially outward.

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

The connecting wire 42 of the coil wire 40 is circumferentially extended along the outer surface 24p of the outer wall portion 24 so as not to disturb the path of the winding machine during winding of the other coil 50 to be sequentially wound. Passage part 42a is constituted.

Here, attention is focused on 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, after winding the U-phase coil wire 40U, the V-phase coil wire 40V is wound. That is, U-phase coil wire 40U is a coil wire (first coil wire) wound first, and W-phase coil wire 40W is a coil wire (second coil wire) wound later.

In the winding process of the U-phase coil wire 40U, the winding machine (or a 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 outward of the outer wall portion 24. Keep it along. Thus, the outer passage portion 42a is provided on the connecting wire 42 of the U-phase coil wire 40U.

Further, in the winding process of the V-phase coil wire 40V, the winding machine allows the crossover 42 of the V-phase coil wire 40V to be along the outer surface 24p of the outer wall 24 radially outside the outer wall 24 and The radially inner side of the outer wall portion 24 is linearly extended in a region overlapping the lead wire 41 of the phase coil wire 40U in the radial direction. Thereby, the outer passing portion 42 a and the inner passing portion 42 b are provided in the connecting wire 42 of the V-phase coil wire 40 V. Further, the inner passing 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 (in the present embodiment, the U-phase coil wire 40U).

In the conventional structure, the connecting wire of the coil wire does not have the inner passage portion 42b of this embodiment. The crossover wire of the conventional structure passes the outer side of the outer wall portion over substantially the entire length, and passes immediately above the lead wire of the coil wire which has been wound. For this reason, when raising a lead-out wire after a winding process, a lead-out wire contacts with a connecting wire of other coil wire. For this reason, there existed a possibility that insulation ensuring of the coil wire of another phase became inadequate. In addition, there has been a problem that the raised leader line expands radially outward, and the radial dimension of the stator is enlarged.

According to the present embodiment, the crossover wire 42 of the V-phase coil wire 40V to be wound later passes inward in the radial direction of the outer wall portion 24 in a region overlapping the lead wire 41 of the U-phase coil wire 40U to be wound in the radial direction. . Therefore, even if the lead-out wire 41 of the U-phase coil wire 40U is raised after the winding process, the U-phase coil wire 40U does not interfere with the crossover 42 of the V-phase coil wire 40V. Thereby, insulation can be secured between U-phase coil wire 40U and V-phase coil wire 40V. Moreover, it can suppress that the raised leader line 41 spreads to a radial direction outer side, and can suppress the enlargement of the radial direction dimension of the stator 3.

Here, focusing on the U-phase coil wire 40U and the V-phase coil wire 40V, the relationship between the coil wire 40 wound first and the coil wire 40 wound later is described. However, in the case of focusing on the W-phase coil wire 40W as the coil wire 40 to be wound later, the same applies to the relationship with the coil wire (U-phase coil wire 40U and V-phase coil wire 40V) to be wound first.

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

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

According to this embodiment, the connecting wires 42 of the V-phase coil wire 40V and the W-phase coil wire 40W each have an inner passing portion 42b. Since the inner passage portion 42 b extends in a straight line, the crossover 42 can be shortened as compared with the case where the radially outer side of the outer wall portion 24 is passed. As a result, the weight of the stator 3 and the cost of the coil wire 40 can be reduced.

(Hange)

FIG. 9 is a perspective view of a part of the connecting wire 42 of the V-phase coil wire 40V. In addition, although the structure of the connecting wire 42 of V phase coil wire 40V is demonstrated here, the same structure is employable also about W phase coil wire 40W which has the inner passage part 42b similarly to V phase coil wire 40V.

The outer wall portion 24 is provided with a hook 25. As described above, the connecting 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 42 b is drawn radially inward of the outer wall portion 24 at the boundary with the outer passage portion 42 a. A crossover 42 is hung on the hooking portion 25 at the boundary between the outer passage portion 42a and the inner passage portion 42b.

In the winding process, tension is applied to the connecting wire 42 so that the connecting wire 42 is not slackened. The crossover wire 42 is hooked on the hooking portion 25 at the boundary between the outer passage portion 42a and the inner passage portion 42b, thereby suppressing movement of the outer passage portion 42a inward in the radial direction of the outer wall portion 24; It can be along the radial outside of 24.

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

According to the present embodiment, the outer wall portion 24 is provided with the first region 26a and the second region 26b of different heights, and the step 27 between the first region 26a and the second region 26b is the hooking portion 25. Configure. Therefore, the crossover 42 can be hooked on the hooking portion 25 without moving the nozzle of the winding machine in the vertical direction, and the time of the winding process can be shortened. Further, since the second region 26b is lower than the first region 26a, it is possible to suppress the nozzle of the winding machine from contacting the outer wall portion 24 in the second region 26b.

(Modification 1 of hook portion)

Next, the hooking portion 125 of the modification 1 adoptable to the present embodiment will be described based on FIG. In addition, about the component of the aspect same as the above-mentioned embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As in the above-described embodiment, the crossover portion 42 is hung on the hook portion 125 of the present modification at the boundary between the outer passage portion 42 a and the inner passage portion 42 b. The hook 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 portion 125 is a first protrusion 127 that protrudes upward from the upper end surface 24s of the outer wall portion 24. That is, the first protrusion 127 constitutes the hooking portion 125.

The crossover wire 42 extends along the circumferential direction in the outer passage portion 42 a and is hooked on the first protrusion 127, and is therefore wound around the radially inner side of the outer wall portion 24 as the inner passage portion 42 b. The crossover wire 42 extends along the circumferential direction in the outer passage portion 42 a and is hooked on the first protrusion 127, and is wound around the radially inner side of the outer wall portion 24 as the inner passage portion 42 b.

(Modification 2 of hook portion)

Next, the hook portion 225 of the modification 2 adoptable to the present embodiment will be described based on FIG. In addition, about the component of the aspect same as the above-mentioned embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

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

The crossover wire 42 extends along the circumferential direction in the outer passage portion 42 a and is hooked on the second protrusion 227, and is thus wound around the radially inner side of the outer wall portion 24 as the inner passage portion 42 b. The crossover wire 42 extends along the circumferential direction in the outer passage portion 42 a and is hooked on the second protrusion 227, and is routed radially inward of the outer wall portion 24 as an inner passage portion 42 b.

Although the embodiment of the present invention and the modification thereof have been described above, each configuration and combination thereof in the embodiment and the modification are only an example, and addition of the configuration without departing from the spirit of the present invention Omissions, substitutions and other changes are possible. Further, the present invention is not limited by the embodiments.

For example, the stator 3 of the above-mentioned embodiment has six coils 50. However, the number of coils 50 of the stator 3 is not limited to this embodiment. Moreover, in the above-mentioned embodiment, two coils 50 are comprised by one coil wire 40. As shown in FIG. However, three or more coils may be configured by one coil wire 40.

DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Rotor, 3 ... Stator, 10 ... Stator core, 11 ... Core back, 12 ... Teeth, 20 ... Insulator, 21 ... Base, 24 ... Outer wall part, 24a ... Lead wire notch (notch), 24b: Cutaway portion for a crossover wire (notch portion), 24c: first convex portion (convex portion), 24d: second convex portion (convex portion), 24p: outer side surface, 24s: upper end surface, 25, 125, 225: hook portion 26a: first region 26b: second region 27: step portion 40: coil wire 40 U U-phase coil wire (first coil wire) 40 V: V-phase coil wire (second Coil wire), 40 W: W-phase coil wire, 41: leader wire, 42: crossover, 42a: outer passage portion, 42b: inner passage portion, 42A: upper junction, 42B: lower junction, 50: coil , 127: first protrusion, 227: second protrusion, 24bA: upper notch (First notch portion), 24ba ... bottom, 24ca, 24da ... lower surface, 24bb ... lower notch (second notch), J ... central axis

Claims

A stator core having an annular core back centered on a central axis extending along the vertical direction, and a plurality of teeth extending radially inward from the core back;

An insulator attached to the stator core;

A plurality of coil wires wound around the teeth via the insulator;

Each of the plurality of coil wires is

A plurality of coils wound by concentrated winding around the teeth;

And a crossover connecting the plurality of coils together,

The insulator is

A base surrounding the outer peripheral surface of the teeth;

An outer wall portion located immediately above the core back and extending along a circumferential direction;

The outer wall portion is provided with a first notch extending downward from the upper end,

The outer surface of the outer wall portion is provided with a first convex portion protruding radially outward,

A bottom surface facing the upper side of the first notch is located above the lower surface of the first protrusion,

The crossovers of the pair of coil wires extend in the circumferential direction, lined up and down along the outer side surface of the outer wall portion and radially outward of the outer wall portion,

One of the pair of crossovers arranged in the upper and lower direction is an upper crossover, and the other passing through the lower side of the upper crossover is a lower crossover.

The upper connecting wire is drawn radially outward of the outer wall through the first notch.

The lower connecting wire passes immediately below the first convex portion,

Stator.
The outer surface of the outer wall portion is provided with a second convex portion protruding radially outward,

The lower surface of the second convex portion is located above the bottom surface of the first notch,

The upper connecting wire passes immediately below the second convex portion,

The stator according to claim 1.
The outer wall portion is provided with a second notch extending downward from the upper end,

A bottom surface facing the upper side of the second notch portion is located below the lower surface of the first convex portion,

The lower connecting wire is drawn radially outward of the outer wall through the second notch.

The stator according to claim 1 or 2.
The circumferential width of the second convex portion is longer than the circumferential width of the first convex portion.

The stator according to claim 2.
The first convex portion is disposed adjacent to the first notch in the circumferential direction.

The stator according to any one of claims 1 to 4.
The stator according to any one of claims 1 to 5;

And a rotor which is opposed to the stator with a gap in the radial direction and which rotates about the central axis.

motor.