JP2014187797A - Wire connection member, stator, electric motor, and method of manufacturing stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire connection member, a stator, an electric motor, and a method of manufacturing the stator, that can achieve miniaturization while reducing a cost of manufacture and that can improve wiring workability of coils.SOLUTION: A wire connection member 21 for connecting coils 14 of a plurality of phases wound on a stator core 12 has a holder part 22 arranged at an axial direction end part of the stator core 12 and formed annularly. The holder part 22 has a plurality of step parts 23a, 23b, and 23c whose diameter is gradually reduced in step wise toward an opposite side to the stator core 12 in an axial direction. The coils 14 are arranged so that the respective step parts 23a, 23b, and 23c have different phases and the same step parts 23a, 23b, 23c have the same phase.

Description

  The present invention relates to a wiring member, a stator, an electric motor, and a method for manufacturing a stator.

  For example, an inner rotor type brushless motor has a stator that is fitted and fixed to a motor housing (motor case), and a rotor that is disposed at the center in the radial direction of the motor housing and is rotatably supported by the stator. Yes. A plurality of permanent magnets are disposed on the outer peripheral surface of the rotor. The stator includes a substantially cylindrical stator core and a plurality of teeth portions protruding radially inward from the stator core.

  A resin insulator, which is an insulating material, is attached to each of the teeth portions, and a coil is wound through the insulator. The coil is composed of, for example, three phases of a U phase, a V phase, and a W phase. A predetermined magnetic flux is formed in the stator core by supplying electric power from an external power source to the coils of each phase in order. An attractive force or a repulsive force is generated between the magnetic flux and the permanent magnet, and the rotor rotates.

  By the way, as a means for supplying power to the coils of each phase, a unitized bus bar unit may be used in order to reduce the size or improve the assembling property. A bus bar unit is known in which a plurality of metal bus bars are embedded in a resin mold body formed in a substantially annular shape while being insulated from each other. For example, when the coils are connected by the star connection method, a plurality of bus bars for supplying power to the coils of each phase and a bus bar forming a neutral point (common) are embedded in the resin mold body. ing.

  Here, when a plurality of bus bars and a resin mold body in which these are embedded are used, a resin molding process is also required as a motor manufacturing process, which increases manufacturing costs and makes the entire motor expensive. For this reason, in order to reduce the number of parts such as bus bars and reduce the cost of the entire motor, a plurality of grooves in which the coils can be routed are formed on the radially outer side of the insulator around which the coils are wound. There is also known a technique for connecting coils of each phase while housing the coils in the coil (for example, see Patent Document 1).

JP 2011-205817 A

However, in the above-described prior art, since the coil is drawn out to the outside in the radial direction of the insulator around which the coil is wound, there is a problem that the diameter of the entire stator is easily increased, and as a result, the electric motor is increased in size.
In addition, the coil is pulled out radially and wired in the groove of the insulator, and in order to check this groove, the insulator must be visually recognized from the radial outside, and there is a problem that the coil wiring workability is poor. is there.
Furthermore, there is a problem that the connection that secures the insulation between the coils of the same phase becomes complicated.

  Accordingly, the present invention has been made in view of the above-described circumstances, and is capable of reducing the manufacturing cost and reducing the size and improving the coil routing workability, the stator, the electric motor, and A method for manufacturing a stator is provided.

  In order to solve the above-described problems, a connection member according to the present invention is a connection member for connecting a plurality of coils wound around a stator core, and is disposed at an end portion in the axial direction of the stator core. The holder portion has a plurality of step portions so that the diameter of the holder portion gradually decreases by steps as it goes to the opposite side of the stator core in the axial direction. The coils are routed so that they are out of phase and the same stepped portions are in phase.

By comprising in this way, since several bus bars and the resin mold body which embeds these are unnecessary like the past, manufacturing cost can be reduced.
Moreover, since the coils of the respective phases are separately routed using the step portion formed in the holder portion, it is not necessary to draw the coils outward in the radial direction, and it is possible to prevent the connecting member from increasing in diameter. Furthermore, since each stepped portion is gradually reduced in diameter by a step as it goes to the opposite side of the stator core in the axial direction, the coil wiring state can be maintained regardless of whether the holder portion is viewed from the upper side in the axial direction or from the outer side in the radial direction. It can be easily visually recognized. For this reason, the wiring workability | operativity of a coil can be improved.

  The connection member according to the present invention is provided with a plurality of external lead terminals that are electrically connected to the multiple-phase coil and an external power source separately from the holder portion, and the terminal portions of the respective-phase coils correspond respectively. The plurality of external lead terminals are concentrated and connected.

  With this configuration, it is not necessary to pull out the terminal portions of the coils of the respective phases to the outside, and the coils of the respective phases can be collectively connected to an external power source. For this reason, the wiring workability | operativity of a coil can be improved further.

  The connecting member according to the present invention is characterized in that the plurality of external lead terminals are integrated by a terminal holder separate from the holder portion.

  By comprising in this way, an external extraction terminal can be integrated. Moreover, since this integrated thing is a different body from the holder part, the layout property of an external extraction terminal can be improved.

  The connecting member according to the present invention is characterized in that the difference in radius between the step portions adjacent in the axial direction is set to be at least larger than the diameter of the coil.

  By comprising in this way, the insulation between coils of a different phase can be ensured reliably. In addition, it is possible to more easily visually check the arrangement state of the coils of the respective phases to the holder portion.

  In the connecting member according to the present invention, a groove portion having a radially outer side opened over the entire outer peripheral surface is formed on the outer peripheral surface of each step portion, and the coil is routed in the groove portion. It is characterized by.

  By comprising in this way, it can prevent reliably that the coil routed in each level | step-difference part will slip | deviate. Moreover, it can prevent reliably that coils of different phases will contact.

  In the connection member according to the present invention, a plurality of cut grooves having different cut depths are formed on at least one of the two wall portions formed at both axial ends of the groove portion so as to correspond to each stepped portion. It is characterized by.

  By comprising in this way, it becomes easy to guide the coil of the phase respectively corresponding to each level | step-difference part, preventing reliably that the coils of a different phase will contact.

  In the wiring member according to the present invention, one of the two wall portions is formed with a drawing groove for drawing the end portion of the coil along the axial direction, and the coil of each phase has the drawing groove. It is drawn out in the same direction.

  By comprising in this way, the terminal part of the coil pulled out from a holder part can be positioned easily.

  The connecting member according to the present invention is characterized in that a connecting portion capable of connecting one ends of coils of each phase is provided on the inner peripheral surface of the holder portion.

  By comprising in this way, the dead ends of a holder part can be used effectively and the ends of a coil can be connected. For this reason, a connection member can be reduced in size.

  The connecting member according to the present invention is characterized in that a substantially annular neutral point bus bar is provided in the connecting portion, and one end of a coil of each phase is connected to the neutral point bus bar.

  By comprising in this way, while the end of the coil of each phase can be connected easily, the bulk of a coil can be suppressed and also a connection member can be reduced in size.

  A stator according to the present invention includes a connection member, a stator core having a plurality of teeth portions around which the coils of the plurality of phases are wound, and an insulator that is attached to the stator core and insulates between the teeth portions and the coils. The holder portion is placed on the insulator so as to engage with the holder in a circumferential direction.

  With this configuration, it is possible to reduce the manufacturing cost, reduce the size, and improve the coil routing workability. Further, since the holder part can be positioned with respect to the insulator, the workability of the coil wiring to the holder part can be improved.

  The stator according to the present invention is characterized in that a terminal portion of the coil is drawn from a radially inner end of the tooth portion.

  By comprising in this way, the expansion to the radial direction of the coil pulled out from the stator can be suppressed, and a stator can be reduced in size.

  An electric motor according to the present invention includes a stator, a rotor that is rotatably provided with respect to the stator, and a motor housing that houses the stator and the rotor.

  With this configuration, it is possible to reduce the manufacturing cost while reducing the size and to provide an electric motor that can improve the coil routing workability.

  The electric motor according to the present invention is provided with a resolver for detecting a rotation angle of the rotor on the connecting member, and a recess capable of receiving the terminal portion of the resolver is formed in a part of the holder portion. The coil is routed so as to avoid the problem.

  With this configuration, the space occupied by the resolver and the connecting member can be reduced, so that the electric motor can be reduced in size.

  A stator manufacturing method according to the present invention includes a stator core having a plurality of teeth portions around which coils of a plurality of phases are wound, and a connection member for connecting the coils of the plurality of phases. A holder portion disposed in an axial end portion of the stator core and formed in an annular shape, wherein the holder portion has a plurality of step portions so that the diameter of the holder portion is reduced by a step as it goes to the opposite side of the stator core in the axial direction; A method of manufacturing a stator, comprising: a coil winding step of winding the coil around each of the plurality of tooth portions and cutting a terminal portion of the coil by a predetermined length; and a shaft of the stator core A holder part setting step for placing the holder part at one end in the direction, and a corresponding phase coil in each step part of the holder part, and collecting one end of the end part of the coil in the same phase A coil routing step for forming a converging portion, a cutting step for cutting off the extra length of the coil routed in the holder portion, and a plurality of electrical connections between the plurality of coils and an external power source. And a connecting step of electrically connecting the aggregating portion corresponding to each of the external lead terminals.

  By adopting such a manufacturing method, it is possible to obtain a stator that can be reduced in size and improved in the coil routing workability while reducing the manufacturing cost.

  The stator manufacturing method according to the present invention is characterized in that, in the coil routing step, the coils are routed in order from the step portion having the smallest diameter among the step portions.

  By comprising in this way, a coil can be efficiently routed to a holder part.

According to the present invention, the manufacturing cost can be reduced because a plurality of bus bars and a resin mold for embedding them are not required as in the prior art.
Moreover, since the coils of the respective phases are separately routed using the step portion formed in the holder portion, it is not necessary to draw the coils outward in the radial direction, and it is possible to prevent the connecting member from increasing in diameter. Furthermore, since each stepped portion is gradually reduced in diameter by a step as it goes to the opposite side of the stator core in the axial direction, the coil wiring state can be maintained regardless of whether the holder portion is viewed from the upper side in the axial direction or from the outer side in the radial direction. It can be easily visually recognized. For this reason, the wiring workability | operativity of a coil can be improved.

It is a longitudinal cross-sectional view which shows the structure of the brushless motor in embodiment of this invention. It is a top view of the state which removed the bracket of the brushless motor in the embodiment of the present invention. It is a disassembled perspective view of the connection member in embodiment of this invention. It is a perspective view of the connection member in the embodiment of the present invention. It is explanatory drawing which shows the manufacturing method of the stator in embodiment of this invention, Comprising: (a)-(d) shows each process.

(Brushless motor)
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing the configuration of the brushless motor 1, and FIG. 2 is a top view of the brushless motor 1 with a bracket 6 removed.
As shown in FIGS. 1 and 2, the brushless motor 1 is used in, for example, an electric power steering (EPS) device, and is press-fitted or bonded to a bottomed cylindrical motor housing 2. The stator 3 fixed by the fixing means, the rotor 4 provided rotatably with respect to the stator 3, the connection member 21 for connecting the coil 14 of the stator 3, and the rotation angle of the rotor 4 are detected. The bracket 6 which closes this to the opening part 5 of the motor housing 2 is fastened and fixed with the volt | bolt which is not illustrated.

  A stator 3 is fixed to the inner peripheral surface of the peripheral wall 7 of the motor housing 2. The end portion (bottom portion) 8 of the motor housing 2 is formed with a boss portion 9 projecting outward in the axial direction at the radial center, and a bearing 10 is press-fitted and fixed thereto. One end (lower end in FIG. 1) of the rotating shaft 11 of the rotor 4 is rotatably supported by the bearing 10.

  The stator 3 has a substantially cylindrical stator core 12. The stator core 12 is formed by laminating a plurality of metal plates (electromagnetic steel plates) punched into a substantially ring shape by press working in the axial direction of the rotor 4 or press-molding soft magnetic powder. The stator core 12 is formed with a plurality (for example, nine in the present embodiment) of teeth 15 for winding the coil 14 radially inward. Each tooth portion 15 is provided with an insulator 16 which is an insulating material, and a coil 14 is wound on the insulator 16 by a concentrated winding method. The coil 14 is composed of three phases of U phase, V phase, and W phase.

The rotor 4 has a rotor core 90 that is externally fixed to the rotary shaft 11. The rotor core 90 is also formed by laminating a plurality of metal plates (electromagnetic steel plates) punched into a substantially ring shape by pressing in the axial direction of the rotor 4. The rotor core 90 is disposed at a location corresponding to the stator 3. The rotor core 90 is composed of three substantially disk-shaped cores 91 stacked in the axial direction.
A press-fitting hole 92 for press-fitting the rotary shaft 11 is formed at the substantially center in the radial direction of each core 91. A plurality of permanent magnets 17 formed in a tile shape are arranged on the outer peripheral surface of each core 91 so that the magnetic poles are changed in order in the circumferential direction. The permanent magnets 17 are positioned in the circumferential direction by a magnet holder 93 disposed around each core 91. Although not shown, a magnet cover is mounted on the outer peripheral side of each permanent magnet 17 in the rotor core 90 so that each permanent magnet 17 is not exposed to the outer surface of the rotor core 90.

  The magnet holder 93 includes three holders 94, 95, and 96 stacked in the axial direction like the core 91. Each of the holders 94, 95, 96 is formed in a disc shape, and a plurality of arm portions are erected in the axial direction from each disc portion, and the disc portions (base portions) 94a, 95a, 96a are provided. Each is arranged so as to be located on the upper surface side of the split core 91, that is, on the side opposite to the end 8 side of the motor housing 2. That is, of the three holders 94, 95, 96, the first-stage holder 94 and the second-stage holder 95 from the end 8 side of the motor housing 2 have a base portion 94 a, 95a is interposed. Each permanent magnet 17 is positioned and fixed between adjacent arm portions.

Under such a configuration, the cores 91 are stacked in a state of being slightly shifted in the rotation direction. For this reason, the permanent magnets 17 provided in each stage have a skew angle in which the same magnetic poles are twisted in the axial direction.
Further, a resolver rotor 19 constituting one of the resolvers 18 is externally fitted and fixed to the rotary shaft 11 on the other end side (the upper side in FIG. 1) from the rotor core 90. Further, the other end side of the rotating shaft 11 with respect to the resolver rotor 19 is rotatably supported by a bearing 34 provided on the bracket 6.

  The bracket 6 is formed in a substantially disc shape by pressing a metal plate, and a bearing housing 32 is integrally formed at a substantially central portion in the radial direction. The bearing housing 32 is formed in a bottomed cylindrical shape protruding outward in the axial direction, and a bearing 34 is fitted and fixed therein. Further, an insertion hole 33 for inserting the rotation shaft 11 is formed in the end portion (bottom portion) 32 a of the bearing housing 32, and the other end of the rotation shaft 11 extends outward in the axial direction through the insertion hole 33. Protrusively. For example, a speed reducer constituting an electric power steering apparatus is connected to the other end of the rotating shaft 11.

  A housing inlay portion 28 is integrally formed on the outer peripheral side of the bracket 6 on the motor housing 2 side (inner surface side). The housing inlay portion 28 is formed by projecting a part of the bracket 6 so as to be substantially annular when viewed from the motor housing 2 side. The inner peripheral surface of the peripheral wall 7 of the motor housing 2 is fitted on the outer peripheral surface 28 a of the housing spigot portion 28.

Further, a resolver holder 35 is provided on the side of the motor housing 2 of the bracket 6 at a position corresponding to the resolver rotor 19 in the substantially radial center. The resolver holder 35 is formed by pressing a metal plate into a substantially bottomed cylindrical shape, and is attached so that the opening 35 a is engaged with the bracket 6 and closed.
The resolver holder 35 has an end portion (bottom wall) 35b formed with an opening 35c in most part thereof, through which the rotary shaft 11 and the resolver rotor 19 can be inserted. Further, a resolver stator 20 constituting the other of the resolver 18 is fitted and fixed to the inner peripheral surface of the peripheral wall 35 d of the resolver holder 35.

  The resolver stator 20 has a substantially annular core 40 configured by laminating plates made of a magnetic material. The core 40 is provided with a plurality of tooth portions (not shown) protruding radially inward at equal intervals. A coil (not shown) is wound around these teeth portions 41 after an insulator 42 as an insulating material is mounted. The insulator 42 is formed by integrally molding an insulator main body 44 formed in a substantially annular shape in plan view and a terminal holder portion 45 having a substantially rectangular shape in plan view extending outward from the insulator main body 44 in the radial direction. .

A notch 36 is formed in the peripheral wall 35 d of the resolver holder 35 at a portion corresponding to the terminal holder 45. The resolver stator 20 is configured such that displacement in the rotation direction is restricted by fitting the terminal holder portion 45 into the notch portion 36 of the resolver holder 35.
Under such a configuration, when the resolver rotor 19 rotates as the rotary shaft 11 rotates, the magnetic flux generated by the resolver rotor 19 changes. When the resolver stator 20 detects this change in magnetic flux, the rotation angle of the rotating shaft 11 can be detected.

(Connection member)
FIG. 3 is an exploded perspective view of the connecting member 21, and FIG. 4 is a perspective view of the connecting member 21.
As shown in FIGS. 3 and 4, a connecting member 21 is placed on the axial end of the insulator 16 of the stator 3. The connecting member 21 has a holder portion 22 formed in a substantially annular shape from resin. Three step portions 23 a, 23 b, and 23 c are formed on the outer peripheral surface of the holder portion 22 so that the diameter gradually decreases due to the steps toward the opposite side of the stator core 12 in the axial direction (upper side in FIGS. 3 and 4). Is formed.

That is, the holder portion 22 is disposed between the lower step portion 23a having the largest diameter, the upper step portion 23c having the smallest diameter, and the lower step portion 23a and the upper step portion 23c. It has a middle step portion 23b set to have a size between the diameter of the step portion 23a and the diameter of the upper step portion 23c.
In the middle step portion 23b and the upper step portion 23c, a notch recess 56 capable of receiving the terminal holder portion 45 is formed at a portion corresponding to the terminal holder portion 45 (see FIG. 2) of the resolver stator 20. In a state where the resolver 18 and the connecting member 21 are set in the motor housing 2, the resolver 18 is positioned on the holder portion 22, and the terminal holder portion 45 is placed in the notch recess 56 of the holder portion 22. .

Further, the holder portion 22 is integrally formed with a first flange portion 24a that protrudes radially outward over the entire periphery of the lower step portion 23a. Further, the holder portion 22 is integrally formed with a second flange portion 24b protruding outward in the radial direction over the entire circumference at the periphery between the lower step portion 23a and the middle step portion 23b. In addition, the holder portion 22 is integrally formed with a third flange portion 24c protruding outward in the radial direction over the entire circumference at the periphery between the middle step portion 23b and the upper step portion 23c. Furthermore, the holder part 22 is integrally formed with a fourth flange part 24d that protrudes radially outward over the entire periphery of the upper step part 23c.
The diameters of the flange portions 24a to 24d are also formed so as to be gradually reduced in diameter toward the opposite side of the stator core 12 in the axial direction so as to correspond to the diameters of the three step portions 23a to 23c.

With the flange portions 24a to 24d and the outer peripheral surfaces of the step portions 23a to 23c, the holder portion 22 is formed with three groove portions 25a to 25c that are opened on the radially outer side.
That is, the first groove portion 24a, the outer peripheral surface of the lower step portion 23a, and the second flange portion 24b form a first groove portion 25a having a U-shaped cross section. In addition, a second groove portion 25b having a U-shaped cross section is formed by the second flange portion 24b, the outer peripheral surface of the middle step portion 23b, and the third flange portion 24c. Furthermore, a third groove portion 25c having a U-shaped cross section is formed by the third flange portion 24c, the outer peripheral surface of the upper step portion 23c, and the fourth flange portion 24d.

  And the terminal part of the coil 14 withdraw | derived from the stator 3 is respectively routed in each groove part 25a-25c. Here, since the stator 3 of the present embodiment is provided with nine teeth portions 15 around which the coils 14 are wound in a concentrated winding method, the number of terminal portions of the coils 14 drawn out to the holder portion 22 is as follows. , A total of 18. Moreover, the coil 14 of this embodiment is connected by what is called a star connection system.

  That is, of the two terminal portions 14a and 14b of each coil 14, one terminal portion 14a exists and is electrically connected to the power source of each phase. There are also nine other terminal portions 14b, each serving as a neutral point. In the following description, one terminal unit 14a is referred to as a power supply side terminal unit 14a, and the other terminal unit 14b is referred to as a neutral point side terminal unit 14b.

And while the power supply side terminal part 14a is routed in each groove part 25a-25c, the neutral point side terminal part 14b is pulled out by the inner peripheral surface 22a side of the holder part 22, respectively.
Here, only the terminal part of the coil 14 of the same phase is routed in each of the groove parts 25a to 25c. That is, for example, three power-side end portions 14a of the U-phase coil 14 are routed in the first groove portion 25a, and three power-side end portions 14a of the V-phase coil 14 are disposed in the second groove portion 25b. Three power supply side terminal portions 14a of the W-phase coil 14 are arranged in the third groove portion 25c.

  Further, in each of the flange portions 24a to 24d, cut grooves 26a to 26c are formed so as to correspond to locations where the power supply side terminal portions 14a are pulled out. Further, the cut grooves 26a to 26c are arranged at equal intervals in the circumferential direction (in the present embodiment, at intervals of 40 degrees). Further, each of the cut grooves 26a to 26c is formed from the radially outer side to the outer peripheral surface of the groove parts 25a to 25c in which the corresponding power supply side terminal portion 14a is routed, and the cut depths are different.

  More specifically, three first cut grooves 26a through which the power supply side terminal portion 14a routed in the first groove portion 25a is inserted are formed only in the first flange portion 24a. The first cut grooves 26a are equally spaced in the circumferential direction (120 degree intervals in the present embodiment) so as to correspond to positions where the corresponding phase (for example, U phase) coils 14 are wound. Has been placed. Furthermore, the cutting depth of the first cutting groove 26a is set between the outer peripheral edge of the first flange 24a and the outer peripheral surface of the lower step portion 23a.

  In addition, three second cut grooves 26b through which the power supply side terminal portion 14a routed in the second groove portion 25b is inserted are formed in the first flange portion 24a and the second flange portion 24b, respectively. Further, the second cut grooves 26b are equally spaced in the circumferential direction (120 degrees in the present embodiment) so as to correspond to positions where the corresponding phase (for example, V phase) coils 14 are wound. Has been placed. Furthermore, the cutting depth of the second cutting groove 26b is set between each outer peripheral edge and the outer peripheral surface of the middle step portion 23b.

  Further, the third cut groove 26c through which the power supply side terminal portion 14a routed in the third groove portion 25c is inserted has three locations on the first flange portion 24a, the second flange portion 24b, and the third flange portion 24c, respectively. Is formed. Further, the third cut grooves 26c are equally spaced in the circumferential direction (120 degrees in the present embodiment) so as to correspond to positions where the corresponding phase (for example, W phase) coils 14 are wound. Has been placed. Furthermore, the cutting depth of the third cutting groove 26c is set between the respective outer peripheral edges and the outer peripheral surface of the upper step portion 23c.

That is, the cut depths of the cut grooves 26a to 26c are made deeper in the order of the first cut groove 26a, the second cut groove 26b, and the third cut groove 26c so as to correspond to the step portions 23a to 23c. Is set.
Under such a configuration, the power-side terminal portions 14a of the coils 14 of the respective phases are passed through the corresponding cut grooves 26a to 26c, and are guided to the groove portions 25a to 25c while changing their orientations. Here, the power supply side terminal portion 14a of the coil 14 of each phase is routed so as to avoid the notch recess 56 formed in the middle step portion 23b and the upper step portion 23c.

Further, when the radius of the lower step portion 23a is E1, the radius of the middle step portion 23b is E2, the radius of the upper step portion 23c is E3, and the wire diameter of the coil 14 is Φ1, each radius E1 to E3, and The wire diameter Φ1 is
E1-E2> Φ1 (1)
E2-E3> Φ1 (2)
It is set to satisfy. For this reason, the power supply side terminal part 14a which passes through each cutting groove 26a-26c, and the power supply side terminal part 14a routed in each groove part 25a-25c so that this power supply side terminal part 14a may be crossed will contact. Can be prevented.

  Further, out of the flange portions 24a to 24d constituting the groove portions 25a to 25c, drawer grooves 27a to 27c are formed in the flange portions 24b to 24d located on the side opposite to the stator core 12. These lead-out grooves 27 a to 27 c collectively form the power supply side terminal portions 14 a of the respective phases routed in the respective groove portions 25 a to form the aggregation portions 30 a to 30 c, and these aggregation portions 30 a to 30 c are arranged in the axial direction of the holder portion 22. It is a groove for pulling out to the outside.

  That is, as will be described in detail in FIG. 2, the second eaves portion 24b is formed with a first lead-out groove 27a for pulling out the power supply side terminal portion 14a routed in the first groove portion 25a. Moreover, the 2nd drawer | drawing-out groove | channel 27b for drawing out the power supply side terminal part 14a currently wired by the 2nd groove part 25b is formed in the 3rd collar part 24c. Furthermore, a third lead-out groove 27c for pulling out the power supply side terminal portion 14a routed in the third groove portion 25c is formed in the fourth flange portion 24d.

  These lead grooves 27a to 27c are formed on one side of the holder portion 22 so as to correspond to external lead terminals 61a to 61c described later, and are arranged at regular intervals (in the present embodiment, at intervals of 40 degrees). That is, when viewed from the axial direction, the first extraction groove 27a and the second extraction groove 27b are arranged on both sides of the third extraction groove 27c, respectively.

On the other hand, on the inner peripheral surface 22a of the holder portion 22, a substantially annular connecting portion 51 that protrudes radially inward over the entire circumference is integrally formed at a position corresponding to the lower step portion 23a. A substantially annular groove 52 is formed in the connecting portion 51 so as to be deeper in the axial direction, and a substantially annular neutral point bus bar 53 is press-fitted and fixed to the groove 52. The neutral point bus bar 53 is formed by rounding a rod-shaped member die-cut from a flat plate into a ring shape.
In addition, a cut portion 54 is formed in the connection portion 51 so as to correspond to a location where the neutral point side terminal portion 14b is pulled out. The cut portions 54 are arranged at equal intervals in the circumferential direction (in the present embodiment, at intervals of 40 degrees). The neutral point side terminal portion 14 b of each coil 14 is inserted through the cut portion 54.

  On the other hand, the neutral point bus bar 53 is formed with a connection convex portion 55 at a position corresponding to the cut portion 54. The connection convex portion 55 is formed so as to protrude when the neutral point bus bar 53 is die-cut. When the neutral point bus bar 53 is attached to the connecting portion 51, the connecting convex portion 55 protrudes from the connecting portion 51. Then, the protruding connection convex portion 55 and the neutral point side terminal portion 14b of each coil 14 are electrically connected by welding or the like.

In addition, the power-side terminal portions 14a that are drawn outward in the axial direction from the respective drawing grooves 27a to 27c of the holder portion 22 are electrically connected to the corresponding external drawing terminals 61a to 61c, respectively.
The external lead terminals 61a to 61c are composed of a first external lead terminal 61a, a second external lead terminal 61b, and a third external lead terminal 61c, each of which is formed of a metal plate having high conductivity such as copper. Yes. And the power supply side terminal part 14a currently wired by the 1st groove part 25a is electrically connected to the 1st external extraction terminal 61a. Moreover, the power supply side terminal part 14a currently wired by the 2nd groove part 25b is electrically connected to the 2nd external extraction terminal 61b. Furthermore, the power supply side terminal part 14a currently wired by the 3rd groove part 25c is electrically connected to the 3rd external drawer terminal 61c.

  The external lead terminals 61a to 61c have terminal bodies 62a to 62c extending in a strip shape along the radial direction, respectively. These terminal bodies 62 a to 62 c are arranged side by side in the circumferential direction so as to correspond to the respective drawing grooves 27 a to 27 c of the holder portion 22. That is, the terminal body 62a of the first external lead terminal 61a and the terminal body 62b of the second external lead terminal 61b are arranged on both sides of the terminal body 62c of the third external lead terminal 61c.

  In addition, a substantially oval ring-shaped coil connection portion 63c into which the power supply side terminal portion 14a drawn out from the third lead-out groove 27c is inserted is integrally formed at the base end of the terminal body 62c of the third external lead-out terminal 61c. ing. Further, an arm portion 64a extending in a direction away from the third external lead terminal 61c is integrally formed at the base end of the terminal main body 62a of the first external lead terminal 61a. The arm portion 64a is curved along the circumferential direction. A substantially oval ring-shaped coil connection portion 63a into which the power supply side terminal portion 14a drawn from the first drawing groove 27a is inserted is integrally formed at the tip of the arm portion 64a.

  Furthermore, an arm portion 64b extending in a direction away from the third external lead terminal 61c is integrally formed at the base end of the terminal main body 62b of the second external lead terminal 61b. The arm portion 64b is curved along the circumferential direction. A substantially oval ring-shaped coil connection portion 63b into which the power supply side terminal portion 14a drawn from the second drawing groove 27b is inserted is integrally formed at the tip of the arm portion 64b.

Thus, each coil connection part 63a-63c is arrange | positioned along with the predetermined interval in the circumferential direction so that it may correspond to each extraction groove | channel 27a-27c of the holder part 22. FIG. In addition, each of the coil connection portions 63a to 63c is configured such that the aggregation portions 30a to 30c are inserted after the corresponding power supply side terminal portions 14a are combined to form the aggregation portions 30a to 30c.
Each coil connection part 63a-63c in which each aggregation part 30a-30c was penetrated is crimped using the jig | tool etc. which are not shown in figure. Thus, after fixing each coil connection part 63a-63c and the corresponding power supply side terminal part 14a, it electrically connects each coil connection part 63a-63c and the corresponding power supply side terminal part 14a by welding etc. It is designed to be connected securely.

The three external lead terminals 61a to 61c configured in this way are integrated in advance by a terminal holder 65 formed of resin.
The terminal holder 65 has a holder body 66 that holds the three terminal bodies 62a to 62c. The holder main body 66 is formed in a substantially rectangular shape in plan view so as to be long in the circumferential direction of the holder portion 22. At both ends in the longitudinal direction of the holder main body 66, a first arm holding portion 67a and a second arm so as to correspond to the arm portion 64a of the first external lead terminal 61a and the arm portion 64b of the second external lead terminal 61b, respectively. An arm holding portion 67b is formed to extend.

  Further, the holder main body 66 is formed with a first concave portion 66a, a second concave portion 66b, and a third concave portion 66c into which the three terminal main bodies 62a to 62c are fitted, respectively, along the longitudinal direction of the holder main body 66. . Further, the first arm holding portion 67a is formed with a first recess 68a into which the arm portion 64a of the first external lead terminal 61a is fitted. The second arm holding portion 67b is formed with a second recess 68b into which the arm portion 64b of the second external lead terminal 61b is fitted.

The third recess 66 c is formed over the entire short direction of the holder body 66. The third recess 66 c is formed at the center in the longitudinal direction of the holder body 66. The third external lead terminal 61 c is attached to the terminal holder 65, and the tip and the coil connection portion 63 c protrude from both ends in the short direction of the holder main body 66.
Further, the first recess 66a of the holder body 66 and the first recess 68a of the first arm holding portion 67a are formed in communication. The first external lead terminal 61a is attached to the terminal holder 65, the tip of the first external lead terminal 61a protrudes from one end in the short direction of the holder body 66, and the coil connecting portion 63a is the first arm holding portion. It protrudes from the tip of 67a.

Furthermore, the 2nd recessed part 66b of the holder main body 66 and the 2nd recessed part 68b of the 2nd arm holding part 67b are formed in communication. The second external lead terminal 61b is attached to the terminal holder 65, the tip of the second external lead terminal 61b protrudes from one end in the short direction of the holder body 66, and the coil connecting portion 63b is the second arm holding portion. It protrudes from the tip of 67b.
Here, the thickness T1 of the holder main body 66 is set to a thickness that does not allow the holder main body 66 and the terminal main bodies 62a to 62c to be flush with each other in a state where the external lead terminals 61a to 61c are attached to the terminal holder 65. Yes.

As shown in FIG. 1, the distal ends of the terminal main bodies 62 a to 62 c of the external lead terminals 61 a to 61 c configured as described above and a part of the holder main body 66 are provided with notches 2 a formed in the motor housing 2. Projecting outside the motor housing 2. And each terminal main body 62a-62c is connected to the connector extended from the external power supply not shown, and the electric power of an external power supply is supplied to each external extraction terminal 61a-61c.
Here, the thickness T1 of the holder main body 66 is set to a thickness that does not allow the holder main body 66 and the terminal main bodies 62a to 62c to be flush with each other in a state where the external lead terminals 61a to 61c are attached to the terminal holder 65. Therefore, it is possible to reliably prevent the external lead terminals 61a to 61c and the motor housing 2 from coming into contact with each other and causing a short circuit.

(Manufacturing method of stator)
Next, a method for manufacturing the stator 3 will be described with reference to FIG.
FIG. 5 is an explanatory view showing a manufacturing method of the stator 3, and (a) to (d) show each step.
First, as shown in FIG. 5A, the coil 14 is wound around each of the teeth portions 15 of the stator core 12 from above the insulator 16 by a concentrated winding method. And the power supply side terminal part 14a and the neutral point side terminal part 14b of each coil 14 are each pulled out long in the same direction in the axial direction. Thereafter, each power supply side terminal portion 14a is cut into a predetermined length that can be routed in predetermined groove portions 25a to 25c of the holder portion 22, and each neutral point side terminal portion 14b is provided in the holder portion 22. Cut to a predetermined length that can be connected to the neutral point bus bar 53 (coil winding step).

  In FIG. 5A, the power supply side terminal portion 14a is drawn from the radially outer side of each tooth portion 15, while the neutral point side terminal portion 14b is drawn from the radially inner side of each tooth portion 15. As shown. However, it is desirable that both the power supply side terminal portion 14a and the neutral point side terminal portion 14b are pulled out from the radially inner side of each tooth portion 15. Details of this will be described later.

Next, as shown in FIG.5 (b), the holder part 22 is mounted on the insulator 16 of the side which pulled out the power supply side terminal part 14a and the neutral point side terminal part 14b (holder part setting process).
At this time, the cut grooves 26a to 26c formed in the holder portion 22 are aligned with the drawing positions of the corresponding power supply side terminal portions 14a.

  As shown in FIGS. 3 and 4, for example, a concave portion 16 a for positioning the holder portion 22 is formed on the end surface on which the holder portion 22 of the insulator 16 is placed, and corresponds to the concave portion 16 a of the holder portion 22. The convex portion 81 (see a two-dot chain line in FIG. 4) that can be fitted to the concave portion 16a is integrally formed at a position where the concave portion 16a is fitted, and the concave portion 16a and the convex portion 81 are fitted, thereby positioning the holder portion 22 relative to the insulator 16. You may comprise so that it may perform.

  Next, as shown in FIG.5 (c), the power supply side terminal part 14a of each corresponding coil 14 is passed through each notch groove 26a-26c, the direction is changed, and the power supply side terminal part is put in each groove part 25a-25c. Route part 14a. At this time, the power-side terminal portion 14a is routed in the order of the second groove portion 25b and the first groove portion 25a from the third groove portion 25c formed in the upper step portion 23c having the smallest diameter. Arranging the power supply side terminal portion 14a in order from the step portion having the smallest diameter in this way means that the power supply side terminal portion 14a is arranged from the innermost side, and then the power supply routed to the outside after that. Interference with the side terminal unit 14a can be prevented. For this reason, it becomes possible to perform the wiring work of the power supply side terminal part 14a smoothly and efficiently.

Thereafter, the power source side terminal portions 14a are collectively pulled out from the corresponding drawing grooves 27a to 27c to form the concentrating portions 30a to 30c (coil routing step).
Further, the neutral point side terminal portion 14 b of each coil 14 is inserted into each cut portion 54 of the holder portion 22, and the neutral point side terminal portion 14 b and the connection convex portion 55 of the neutral point bus bar 53 are overlapped.
Thereafter, the excess lengths of the power supply side terminal portion 14a and the neutral point side terminal portion 14b are cut (cutting step).

Here, each level | step-difference part 23a-23c of the holder part 22 is formed so that a diameter may be gradually reduced by a level | step difference as it goes to the opposite side (upper side in FIG. 3, FIG. 4) with respect to the stator core 12 in an axial direction. For this reason, in the coil routing step, the routing state of the coil 14 can be easily visually recognized whether the holder portion 22 is viewed from the upper side in the axial direction (upper side in FIG. 5C) or from the radially outer side.
In addition, when both the power supply side terminal portion 14a and the neutral point side terminal portion 14b of each coil 14 are pulled out from the radial inner side of each tooth portion 15, in the coil routing process, the respective cut grooves 26a to 26c are provided. Can be prevented from spreading radially outward. For this reason, it can be made to follow the outer peripheral surface of each level | step-difference part 23a-23c reliably.

Next, as shown in FIG.5 (d), each aggregation part 30a-30c is inserted in the coil connection part 63a-63c of corresponding external lead-out terminal 61a-61c, and this coil connection part 63a-62c is not shown in figure. Tighten with a jig etc. Then, each coil connection part 63a-63c and the corresponding power supply side terminal part 14a are electrically connected by welding etc. (connection process).
Moreover, the neutral point side terminal part 14b and the connection convex part 55 of the neutral point bus bar 53 are electrically connected by welding or the like. Thereby, the coil 14 is connected by a so-called star connection method, and the manufacture of the stator 3 is completed.

(effect)
Therefore, according to the above-mentioned embodiment, the holder part 22 in which the three step parts 23a to 23c are formed is provided so as to correspond to the phase of the coil 14, and each of the step parts 23a to 23c has a corresponding phase. Since the power supply side terminal portion 14a of the coil 14 is routed, it is possible to eliminate a plurality of bus bars and a resin molded body in which these are embedded as in the prior art. For this reason, the manufacturing cost of the stator 3 whole can be reduced.

Moreover, since the power supply side terminal part 14a of the coil 14 of each phase is separately routed using the step parts 23a to 23c formed in the holder part 22, the coil is connected to the power supply side terminal part 14a as in the prior art. It is not necessary to route the insulator 16 to be wound outward in the radial direction, and the connecting member 21 can be prevented from increasing in diameter.
Furthermore, each step part 23a-23c of the holder part 22 is formed so that a diameter may be gradually reduced by a level | step difference as it goes to the opposite side to the stator core 12 in an axial direction. For this reason, the wiring state of the coil 14 to the holder part 22 can be easily visually recognized from the periphery of the holder part 22. For this reason, the wiring workability | operativity of the coil 14 can be improved.

  Then, external lead terminals 61a to 61c are provided separately from the holder part 22, and the converging part 30a formed by the coil connection parts 63a to 63c of the external lead terminals 61a to 61c and the power supply side terminal part 14a of each phase. To 30c. For this reason, it is not necessary to pull out the power supply side terminal portions 14a of the coils 14 to the outside of the motor housing 2, and the coils 14 of the respective phases can be collectively connected to an external power source (not shown). For this reason, the routing workability of the coil 14 can be further improved.

  Moreover, since each external lead-out terminal 61a-61c is integrated by the terminal holder 65, the assembly | attachment property of the external lead-out terminals 61a-61c compared with the case where the external lead-out terminals 61a-61c are each provided separately. Can be improved. In addition to this, since the terminal holder 65 and the holder portion 22 are separate, the layout of each of the external lead terminals 61a to 61c can be improved.

  Furthermore, when the radius of the lower step portion 23a of the holder portion 22 is E1, the radius of the middle step portion 23b is E2, the radius of the upper step portion 23c is E3, and the wire diameter of the coil 14 is Φ1, each radius E1 To E3 and the wire diameter Φ1 are set so as to satisfy the expressions (1), (2), and (3). For this reason, the power supply side terminal part 14a which passes through each cutting groove 26a-26c, and the power supply side terminal part 14a routed in each groove part 25a-25c so that this power supply side terminal part 14a may be crossed will contact. Can be prevented. Further, it is possible to more easily visually check the wiring state of the coil 14 of each phase to the holder portion 22.

  Furthermore, the first flange portion 24a to the fourth flange portion 24d are formed in the holder portion 22, and the radially outer side is opened by these flange portions 24a to 24d and the outer peripheral surfaces of the step portions 23a to 23c. Two groove portions 25a to 25c are formed. And it has comprised so that the power supply side terminal part 14a may be wired to these three groove parts 25a-25c, respectively. For this reason, it can prevent reliably that the power supply side terminal part 14a of each phase wired by each level | step-difference part 23a-23c will shift | deviate. Moreover, it can prevent reliably that the coils 14 of different phases will contact.

  Further, in each of the flange portions 24a to 24d, cut grooves 26a to 26c having different cut depths are formed, and the power supply side terminal portions 14a are guided to the respective groove portions 25a to 25c through the cut grooves 26a to 26c. It is composed. Therefore, it is possible to easily guide the power-side terminal portions 14a of the phases corresponding to the respective grooves 25a to 25c while reliably preventing the coils 14 of different phases from coming into contact with each other.

  Further, among the flange portions 24a to 24d constituting the groove portions 25a to 25c, the extraction grooves 27a to 27c are formed in the flange portions 24b to 24d located on the opposite side of the stator core 12, and the extraction grooves 27a to 27c are formed. Each power supply side terminal unit 14a is configured to be pulled out in the same direction. For this reason, the positioning operation | movement which pulls out each power supply side terminal part 14a can be performed easily.

  A substantially annular connecting portion 51 is integrally formed on the inner peripheral surface 22 a of the holder portion 22, and a substantially annular neutral point bus bar 53 is provided on the connecting portion 51. For this reason, since each neutral point side terminal part 14b can be connected effectively using the dead space of the holder part 22, the whole connection member 21 can be reduced in size. Further, the neutral point side terminal portions 14 b can be easily connected to each other using the neutral point bus bar 53. Furthermore, it is not necessary to route the neutral point side terminal portion 14b in vain, and the bulkiness of the neutral point side terminal portion 14b can be suppressed, so that the entire connecting member 21 can be further downsized.

Further, a concave portion 16a for positioning the holder portion 22 is formed on an end surface on which the holder portion 22 of the insulator 16 is placed, and a convex portion that can be fitted to the concave portion 16a at a position corresponding to the concave portion 16a of the holder portion 22. By integrally forming the portion 81, the holder portion 22 can be easily positioned with respect to the insulator 16.
Further, when both the power-side terminal portion 14a and the neutral point-side terminal portion 14b are drawn from the radially inner side of each tooth portion 15, in the coil routing process, the power-supply side that passes through the cut grooves 26a to 26c. It is possible to prevent the terminal portion 14a from spreading outward in the radial direction. For this reason, it can be made to follow the outer peripheral surface of each level | step-difference part 23a-23c reliably. As a result, the whole connecting member 21 can be reduced in size.

  Further, a notch recess 56 capable of receiving the terminal holder portion 45 of the resolver stator 20 is formed in the middle step portion 23 b and the upper step portion 23 c of the holder portion 22. Furthermore, the power supply side terminal portion 14 a of the coil 14 of each phase is routed so as to avoid the notch recess 56. When the resolver 18 and the connecting member 21 are set in the motor housing 2, the terminal holder portion 45 is placed in the notch recess 56 of the holder portion 22. For this reason, since the area occupied by the resolver 18 and the connecting member 21 in the motor housing 2 can be saved, the brushless motor 1 can be reduced in size.

  Further, in the coil routing step, the power supply side terminal portion 14a is routed in the order of the second groove portion 25b and the first groove portion 25a from the third groove portion 25c formed in the upper step portion 23c having the smallest diameter. By setting it as such a routing procedure, it will route from the power supply side terminal part 14a located in the innermost side, and the wiring work of the power supply side terminal part 14a can be performed smoothly and efficiently. Become.

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the brushless motor 1 is used for an electric power steering apparatus has been described. However, the present invention is not limited to this, and the brushless motor 1 can be applied to various electrical components.

  Further, in the above-described embodiment, the case where the coil 14 is configured by three phases of the U phase, the V phase, and the W phase and is connected by the star connection method has been described. However, the present invention is not limited to this, and it is possible to connect by a so-called delta connection method. When connecting by the delta connection method, the shape of the holder part 22 also needs to be changed slightly. That is, although the point in which the holder part 22 has the level | step-difference parts 23a-23c is not changed, the connection part 51 in which the neutral point bus bar 53 was provided becomes unnecessary. Therefore, it is necessary to provide a connection space for delta connection.

Further, when the star connection method is not employed, the present invention is not limited to the case where the coil 14 is configured by three phases of U phase, V phase, and W phase. For example, it is possible to configure the coil 14 with a plurality of phases such as a five-phase structure. In such a case, the number of stepped portions of the holder portion 22 needs to be changed according to the number of phases of the coil 14.
That is, in the above-described embodiment, the coil 14 is composed of three phases of the U phase, the V phase, and the W phase, and the three step portions 23a to 23a on the holder portion 22 so that each phase can be routed to the holder portion 22. The case where 23c is formed was demonstrated. However, the present invention is not limited to this, and the number of step portions of the holder portion 22 may be changed according to the number of phases of the coil 14.

Moreover, in the above-mentioned embodiment, when the connection convex part 55 is integrally formed in the neutral point bus-bar 53, and the neutral point side terminal part 14b of the coil 14 is electrically connected to this connection convex part 55, it comprises. Explained. However, the present invention is not limited to this, and any configuration is acceptable as long as the neutral point bus bar 53 and the neutral point side terminal portion 14b can be electrically connected.
Furthermore, in the above-mentioned embodiment, the case where the holder part 22 and the terminal holder 65 were comprised separately was demonstrated. However, the present invention is not limited to this, and the holder portion 22 and the terminal holder 65 may be integrally formed.

DESCRIPTION OF SYMBOLS 1 Brushless motor 2 Motor housing 3 Stator 4 Rotor 12 Stator core 14 Coil 14a Power supply side terminal part (terminal part)
14b Neutral point end (one end of coil)
15 Teeth 16 Insulator 16a Recess 18 Resolver 21 Connection member 22 Holder 23a Lower step (step)
23b Middle step part (step part)
23c Upper step part (step part)
24a 1st collar part (wall part)
24b Second collar (wall)
24c 3rd collar part (wall part)
25a First groove (groove)
25b Second groove (groove)
25c Third groove (groove)
26a First cut groove (cut groove)
26b Second cut groove (cut groove)
26c Third cut groove (cut groove)
27a First drawer groove (drawer groove)
27b Second drawer groove (drawer groove)
27c Third drawer groove (drawer groove)
51 Connection Portion 53 Neutral Point Bus Bar 56 Notch Recess 61a First External Lead Terminal (External Lead Terminal)
61b Second external lead terminal (external lead terminal)
61c Third external lead terminal (external lead terminal)
65 Terminal holder 81 Convex

Claims (15)

A connection member for connecting a plurality of coils wound around a stator core,
The holder is disposed at the axial end of the stator core and has a ring-shaped holder.
The holder portion has a plurality of step portions so that the diameter gradually decreases due to the step as it goes in the axial direction opposite to the stator core.
A connection member, wherein coils are routed so that each stepped portion is in a different phase and the same stepped portion is in the same phase.   Provided with a plurality of external lead terminals that are electrically connected to the plurality of phase coils and an external power source separately from the holder part, and the terminal parts of the coils of each phase are respectively connected to the plurality of corresponding external lead terminals. The connection member according to claim 1, wherein the connection members are connected together.   The connection member according to claim 1 or 2, wherein the plurality of external lead terminals are integrated by a terminal holder separate from the holder portion.   The wire connection according to any one of claims 1 to 3, wherein a difference in radius between step portions adjacent in the axial direction is set to be at least larger than a diameter of the coil. Element.   The outer peripheral surface of each stepped portion is formed with a groove portion having a radially outward opening over the entire outer peripheral surface, and the coil is routed in the groove portion. The connection member according to claim 4.   A plurality of cut grooves having different cut depths are formed on at least one of the two wall portions formed at both axial ends of the groove portion so as to correspond to each stepped portion. Item 6. The connection member according to Item 5. One of the two wall portions is formed with a drawing groove for pulling out the terminal portion of the coil along the axial direction.
The connection member according to claim 5 or 6, wherein the coils of each phase are drawn out in the same direction through the lead-out grooves.   The connection member according to any one of claims 1 to 7, wherein a connection portion capable of connecting one ends of coils of each phase is provided on an inner peripheral surface of the holder portion.   The connection member according to claim 8, wherein a substantially annular neutral point bus bar is provided in the connection portion, and one end of a coil of each phase is connected to the neutral point bus bar. The connection member according to any one of claims 1 to 9,
A stator core having a plurality of teeth around which the coils of the plurality of phases are wound;
An insulator mounted on the stator core and insulating between the teeth portion and the coil;
A stator, wherein the holder portion is placed on the insulator so as to engage with the holder portion in a circumferential direction.   The stator according to claim 10, wherein a terminal portion of the coil is drawn from a radially inner end of the tooth portion. A stator according to claim 10 or claim 11,
A rotor provided rotatably with respect to the stator;
An electric motor comprising: a motor housing that houses the stator and the rotor. A resolver for detecting the rotation angle of the rotor is provided on the connecting member,
Forming a recess capable of receiving a terminal portion of the resolver in a part of the holder portion;
The electric motor according to claim 12, wherein the coil is routed so as to avoid the recess. A stator core having a plurality of teeth around which coils of a plurality of phases are wound;
A connection member for connecting the coils of the plurality of phases,
The connecting member has a holder portion that is disposed in an axial end portion of the stator core and formed in an annular shape,
The holder portion is a method of manufacturing a stator having a plurality of step portions so that the diameter of the holder portion is reduced by a step as it goes in the axial direction opposite to the stator core,
A coil winding step of winding the coils around the plurality of teeth portions and cutting the terminal portions of the coils by a predetermined length;
A holder part setting step of placing the holder part on one axial end of the stator core;
A coil routing step of routing a corresponding phase coil to each stepped portion of the holder portion, consolidating one end of the terminal portion of the in-phase coil to form an aggregation portion,
A cutting step of cutting the extra length of the coil routed in the holder part;
A plurality of external lead terminals that electrically connect the plurality of phase coils and an external power source, and a connection step that electrically connects the aggregation sections corresponding to the external lead terminals, respectively. A method for manufacturing a stator. In the coil routing process,
The method of manufacturing a stator according to claim 14, wherein the coils are arranged in order from the step portion having the smallest diameter among the step portions.

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