WO2019189527A1

WO2019189527A1 - Stator and motor

Info

Publication number: WO2019189527A1
Application number: PCT/JP2019/013487
Authority: WO
Inventors: 宏徳連記; 慧中村; 省悟新村; 遼平大脇
Original assignee: 日本電産株式会社
Priority date: 2018-03-30
Filing date: 2019-03-28
Publication date: 2019-10-03

Abstract

One embodiment of the stator of this invention is provided with: a stator core having an annular core back which extends in a circumferential direction about an axis which extends in one direction, and having a plurality of teeth extending inward in a radial direction from the core back; a plurality of coil wires provided on the plurality of teeth; and protrusions protruding inward in the radial direction from the core back between adjacent teeth. The protrusion outer side-surfaces of the outer surfaces of each of the protrusions, the protrusion outer side-surfaces being arranged in the circumferential direction, are parallel to tooth outer-side surfaces of the outer surfaces of the teeth adjacent to the protrusion outer side-surfaces, the tooth outer-side surfaces facing the protrusion outer side-surfaces in the circumferential direction. The protrusion outer side-surfaces perpendicularly cross the inner peripheral surface of the core back.

Description

Stator and motor

The present invention relates to a stator and a motor.

A technique for manufacturing an electric motor by inserting a winding coil wound in a predetermined shape into a salient pole of a stator in an assembly process of the electric motor is known (for example, see Patent Document 1 below).

Japanese publication: JP 2000-125520 A

In the motor, the inner surface on the radially inner side of the stator core provided with the teeth is circular as viewed in the axial direction. However, since the coil wire is not wound so as to match the curvature of the inner surface of the stator core, when the coil wire is inserted into the teeth, the coil wire is collapsed by being pressed against the stator core, and the motor characteristics are deteriorated. Problems arise. Further, since a gap is generated between the coil wire and the core back of the stator core, there arises a problem that the space factor of the coil is lowered and the motor characteristics are lowered. In addition, due to the gap, heat generated from the coil is not efficiently transmitted to the stator core, resulting in a problem that heat dissipation is reduced. *

In view of the above circumstances, an object of the present invention is to provide a stator and a motor that can reduce coil collapse and improve coil space factor and heat dissipation.

One aspect of the stator according to the present invention includes a stator core having an annular core back extending in the circumferential direction around an axis extending in one direction, and a plurality of teeth extending radially inward from the core back, and the plurality of teeth. A plurality of coil wires provided, and a protrusion that protrudes radially inward from the core back between the adjacent teeth, and outside the protrusion located in the circumferential direction on the outer surface of the protrusion The side surface is parallel to the tooth outer surface facing the protrusion outer surface in the circumferential direction among the outer surfaces of the teeth adjacent to the protrusion outer surface, and the protrusion outer surface is the inner surface of the core back. It intersects perpendicularly with the circumference. *

One aspect of the motor of the present invention includes the stator described above and a rotor.

According to one aspect of the present invention, a stator and a motor that can reduce coil collapse and improve the coil space factor and heat dissipation are provided.

FIG. 1 is a cross-sectional view of the motor of the embodiment, and is a view showing a cross-section of the motor along the axial direction. FIG. 2 is a perspective view of the motor according to the embodiment. FIG. 3 is a plan view of the stator. FIG. 4 a is a plan view of the coil group. FIG. 4 b is a front view of the coil group. FIG. 5 is a plan view of the stator core. FIG. 6 is a plan view of a jig used for attaching the coil wire. FIG. 7 is an explanatory diagram of attachment of the coil wire to the stator core. FIG. 8 is a plan view of a jig used for resin filling.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. *

In the following drawings, in order to make each configuration easy to understand, the actual structure may be different from the scale, number, or the like in each structure. In each figure, the Z axis is shown as appropriate. The Z-axis direction in each figure is a direction parallel to the axial direction of the central axis J shown in FIG. In the following description, the positive side (+ Z side, one side) in the Z-axis direction is referred to as “upper side”, and the negative side (−Z side, the other side) in the Z-axis direction is referred to as “lower side”. Call. The upper side and the lower side are directions used for explanation only, and do not limit the actual positional relationship and direction. Unless otherwise specified, a direction parallel to the central axis J (Z-axis direction) is simply referred to as an “axial direction”, and a radial direction around the central axis J is simply referred to as a “radial direction”. The circumferential direction centering around, that is, the circumference of the central axis J is simply referred to as “circumferential direction”. Furthermore, in the following description, “plan view” means a state viewed from the axial direction. *

FIG. 1 is a cross-sectional view of the motor of this embodiment. FIG. 1 is a view showing a cross section of the motor along the axial direction. As shown in FIG. 1, the motor 100 of the present embodiment includes a motor case 2, a rotor 10 that rotates about a central axis J that extends in the vertical direction, and a stator 20 that faces the rotor 10 with a gap in the radial direction. And a pair of bearings 30, a circuit board 40, and a mold resin 50 made of resin. *

FIG. 2 is a perspective view of the motor of this embodiment. As shown in FIGS. 1 and 2, the motor case 2 accommodates each member constituting the motor 100. The motor case 2 includes a bottomed cylindrical housing 3 having a bottom on the lower side in the axial direction, and a lid 4 that covers the upper side in the axial direction of the housing 3. The housing 3 includes a disk-shaped bottom plate portion 3a and a cylindrical peripheral wall portion 3b extending in the axial direction from the outer peripheral edge of the bottom plate portion 3a. The bottom plate portion 3 a has a bearing holding portion 3 c that holds one of the pair of bearings 30. The housing 3 has a notch 6 provided at the tip of the peripheral wall 3b and forming an opening in the radial direction. *

The lid 4 is formed along a disc-shaped disc portion 4a, a cylindrical bearing holding portion 4b provided on the lower (−Z side) surface of the disc portion 4a, and an outer peripheral edge portion of the disc portion 4a. And a peripheral wall portion 4c protruding downward. *

The lid 4 and the housing 3 are fitted together. Specifically, the radially outer peripheral surface of the peripheral wall portion 4 c of the lid 4 and the radially inner peripheral surface of the peripheral wall portion 3 b of the housing 3 are in contact with each other. The lid 4 and the housing 3 are fixed by caulking each other. The notch 6 forms an opening 7 in the motor case 2 that allows the inside of the case and the outside of the case to communicate with each other by fitting the lid 4 and the housing 3 together. *

The rotor 10 includes a shaft 11, a rotor core 12, and a plurality of rotor magnets 13. The shaft 11 extends in one direction around a central axis J that extends in the vertical direction (Z-axis direction). The upper end and the lower end of the shaft 11 are supported by the bearings 30 so as to be rotatable around the central axis J. The rotor core 12 is fixed to the shaft 11. The rotor core 12 surrounds the shaft 11 in the circumferential direction. A plurality (six in this embodiment) of rotor magnets 13 are fixed to the radially outer surface of the rotor core 12. The plurality of rotor magnets 13 have N poles and S poles alternately arranged in the circumferential direction. The rotor core 12 and the rotor magnet 13 rotate together with the shaft 11. *

The circuit board 40 is electrically connected to the lead wire drawn from the coil of the stator 20. The circuit board 40 is provided below the lid 4. That is, the circuit board 40 is provided inside the motor case 2. The circuit board 40 controls the rotation of the rotor 10 by passing a current through the coil. An integrated circuit and a capacitor (not shown) are mounted on the circuit board 40. In the present embodiment, a part of the circuit board 40 is pulled out of the motor case 2 through the opening 7. *

The motor 100 according to the present embodiment includes a rotation detection sensor 41 fixed to the lower surface of the circuit board 40. The rotation detection sensor 41 is located between the mold resin 50 and the circuit board 40 in the axial direction. The rotation detection sensor 41 is a magnetic sensor. The rotation detection sensor 41 has a configuration in which, for example, a Hall element, an MR (Magneto-Resistive) element, and a magnet are combined. The rotation detection sensor 41 detects the position of the rotor 10 by detecting the magnetic field of the rotor magnet 13 in the rotor 10. *

In the motor 100 of the present embodiment, the mold resin 50 is provided in the housing 3 so as to cover the stator 20 as shown in FIG. More specifically, the mold resin 50 is provided at least between the coil wire 32 and the stator core 21. Thereby, the coil wire 32 and the stator core 21 are firmly fixed. Thereby, dropping of the coil wire 32 from the stator core 21 is prevented. The mold resin 50 is provided between the stator 20 and the inner peripheral surface of the motor case 2. Thereby, the stator 20 is firmly fixed to the motor case 2. *

The mold resin 50 is provided on the lid 4 side with respect to the coil wire 32 and on the coil wire 32 side with respect to the notch 6 in the axial direction. Therefore, the mold resin 50 is disposed in the motor case 2 without being exposed to the outside from the opening 7. The mold resin 50 is positioned below the rotation detection sensor 41 fixed to the lower surface of the circuit board 40. That is, the mold resin 50 and the rotation detection sensor 41 do not contact each other. Further, the mold resin 50 is located below the lid 4. Specifically, the mold resin 50 is located on the lower side of the bearing holding portion 4 b located on the lowermost side of the lid 4. With this configuration, since the mold resin 50 and the rotation detection sensor 41 do not contact each other, the housing 3 and the lid 4 can be attached favorably. For example, when attaching the lid 4 to which the rotation detection sensor 41 is attached to the housing 3, it is possible to prevent a problem that the lid 4 cannot be attached to the housing 3 because the mold resin 50 is sandwiched between the circuit board 40 and the opening 7. it can. *

According to the motor 100 of the present embodiment, the mold resin 50 is not provided in the opening 7. As a result, contact between the circuit board 40 drawn to the outside of the motor case 2 through the opening 7 and the mold resin 50 is avoided. Therefore, the housing 3 and the lid 4 can be attached favorably. For example, when the lid 4 to which the circuit board 40 is attached is attached to the housing 3, it is possible to prevent a problem that the lid 4 cannot be attached to the housing 3 because the mold resin 50 is sandwiched between the circuit board 40 and the opening 7. . Further, the circuit board 40 is not displaced due to the contact with the mold resin 50. Therefore, it is possible to prevent positional deviation between the rotation detection sensor 41 provided on the circuit board 40 and the rotor 10. Therefore, it is possible to prevent the rotation detection accuracy of the rotor 10 from being lowered due to the positional deviation of the circuit board 40. *

Further, according to the motor 100 of the present embodiment, since the mold resin 50 does not contact the lid 4, a gap is generated between the mold resin 50 and the lid 4. As a result, a structure in which vibration is not easily transmitted from the stator 20 to the lid 4 is obtained. Therefore, vibration and noise during driving of the motor 100 can be reduced. Further, in the motor 100 according to the present embodiment, since the amount of resin used for the mold resin 50 is smaller than the structure in which the mold resin 50 is disposed between the stator 20 and the lid 4, the amount of the resin is reduced. Reduced weight. *

The stator 20 surrounds the outer side of the rotor 10 in the radial direction. FIG. 3 is a plan view of the stator. As shown in FIG. 3, the stator 20 is annularly arranged around the central axis J. The motor 100 of this embodiment is an inner rotor type motor. The stator 20 includes a stator core 21, a plurality of coil groups 31 attached to the stator core 21, a groove 25, and a protruding portion 28. The stator 20 of the present embodiment includes three coil groups 31. *

In the present embodiment, the stator core 21 is a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the vertical direction. In the present embodiment, the entire surface of the stator core 21 is painted with an insulating coating film having insulating properties. Thereby, the stator core 21 has insulation on the surface. *

The stator core 21 has an annular core back 21a and a plurality of teeth 21b. The teeth 21b extend radially inward from the inner peripheral surface 21a1 of the core back 21a. The teeth 21b are arranged at equal intervals in the circumferential direction. The teeth 21b face the rotor 10 in the radial direction. *

Next, the configuration of the coil group 31 will be described. 4a is a plan view of the coil group, and FIG. 4b is a front view of the coil group. 4A and 4B, the coil group 31 removed from the stator core 21 is illustrated. As shown in FIGS. 4 a and 4 b, the coil group 31 is formed by winding a single conducting wire 34, and has a winding start portion 35 of the conducting wire 34 and a winding end portion 36 of the conducting wire 34.

The coil group 31 includes two or more coil wires 32 connected to each other by a jumper wire 33 between the winding start portion 35 and the winding end portion 36. The coil group 31 of this embodiment has three coil wires 32. That is, the coil group 31 of the present embodiment connects the three coil wires 32 by the two crossover wires 33. In a state where the coil group 31 is removed from the stator core 21, the crossover wire 33 extends linearly. More specifically, the connecting wire 33 extends linearly from the one axial direction side of one coil wire 32 toward the other axial direction side of the other coil wire 32 in the adjacent coil wires 32. Here, the one axial side of the coil wire 32 corresponds to the radially inner side of the coil wire 32 attached to the tooth 21b shown in FIG. Moreover, the axial direction other side of the coil wire 32 is equivalent to the radial direction outer side of the coil wire 32 attached to the teeth 21b shown in FIG. The axis C1 of the coil wire 32 is an axis passing through the center of each coil wire 32 as shown in FIGS. 4a and 4b. That is, the coil wire 32 is configured by winding the conducting wire 34 around the axis C1. Each coil wire 32 is attached to the tooth 21b as described later. *

The stator core 21 of the present embodiment has nine teeth 21b. A slot 23 for accommodating the coil wire 32 is provided between the teeth 21b. Since the rotor 10 includes, for example, six rotor magnets 13, the motor 100 of this embodiment is a motor configured with 6 poles and 9 slots. Note that the number of poles and the number of slots of the motor are not limited to the present embodiment, and are appropriately selected according to the required output and the winding method. *

Here, the motor 100 of the present embodiment is a so-called three-phase motor in which currents of three different phases of U phase, V phase, and W phase flow. In the following description, the three coil groups 31 may be referred to as a first coil group 31U, a second coil group 31V, and a third coil group 31W, respectively. *

The first coil group 31U is a coil group corresponding to the U phase, the second coil group 31V is a coil group corresponding to the V phase, and the third coil group 31W is a coil group corresponding to the W phase. That is, the phases of currents flowing through the first coil group 31U, the second coil group 31V, and the third coil group 31W are different from each other. *

The three coil wires in the first coil group 31U each function as a U-phase coil, the three coil wires in the second coil group 31V each function as a V-phase coil, and the three coil wires in the third coil group 31W are W Each functions as a phase coil. *

As shown in FIG. 3, the first coil group 31U is formed by winding a single conducting wire 34U, and has three U-phase coil wires 32U connected by two connecting wires 33U. The winding start portion 35U of the conducting wire 34U in the first coil group 31U is drawn upward. The winding end portion 36U of the first coil group 31U is drawn radially outward from the side end face of the U-phase coil wire 32U when viewed in the axial direction. *

Since the first coil group 31U is formed by winding the conducting wire 34U, the winding start portion 35U of the conducting wire 34U is drawn out to the other side in the axial direction of the U-phase coil wire 32U, whereby the other side in the axial direction of the U-phase coil wire 32U. Protrusively. The second U-phase coil wire 32U (corresponding to the middle coil wire in FIGS. 4a and 4b) connected to the crossover wire 33U has a connected lead wire portion 32U1 corresponding to the coil winding start portion. The connected lead wire portion 32U1 is connected to the crossover wire 33U. *

The connected lead wire portion 32U1 protrudes to the other side in the axial direction of the U-phase coil wire 32U. Similarly, the third U-phase coil wire 32U (corresponding to the left coil wire in FIGS. 4a and 4b) connected to the crossover wire 33U corresponds to the coil winding start portion, and the axis of the U-phase coil wire 32U. It has the connection leader line part 32U1 which protrudes in the direction other side. *

The second coil group 31V and the third coil group 31W have the same shape as the first coil group 31U except that currents of different phases flow. Therefore, the second coil group 31V has three V-phase coil wires 32V connected by two connecting wires 33V. The winding start portion 35V of the conducting wire 34V in the second coil group 31V is drawn upward. The winding end portion 36V of the second coil group 31V is drawn radially outward from the side end face of the V-phase coil wire 32V when viewed in the axial direction. *

In the second coil group 31V, the winding start portion 35V of the conducting wire 34V protrudes to the other side in the axial direction of the V-phase coil wire 32V. The two V-phase coil wires 32V connected to the crossover wire 33V correspond to coil winding start portions, and have a connected lead wire portion 32V1 protruding to the other side in the axial direction of the V-phase coil wire 32V. Note that the connecting lead wire portion 32V1 is connected to the crossover wire 33V. *

The third coil group 31W has three W-phase coil wires 32W connected by two crossover wires 33W. The winding start portion 35W of the conducting wire 34W in the third coil group 31W is drawn upward. The winding end portion 36W of the third coil group 31W is drawn radially outward from the side end face of the W-phase coil wire 32W when viewed in the axial direction. *

In the third coil group 31W, the winding start portion 35W of the conducting wire 34W protrudes to the other side in the axial direction of the W-phase coil wire 32W. The two W-phase coil wires 32W connected to the crossover wire 33W correspond to the coil winding start portion, and have a connected lead wire portion 32W1 protruding to the other side in the axial direction of the W-phase coil wire 32W. The connecting lead wire portion 32W1 is connected to the crossover wire 33W. *

The winding

start portions

35U, 35V, and 35W of the first coil group 31U, the second coil group 31V, and the third coil group 31W are connected to the circuit board 40 in regions not shown. The winding

end portions

36U, 36V, 36W of the first coil group 31U, the second coil group 31V, and the third coil group 31W are pulled out to positions overlapping the core back 21a when viewed in the axial direction, and are twisted together in a region not shown. Are combined to form a neutral point. *

Each coil wire (U-phase coil wire 32U, V-phase coil wire 32V, and W-phase coil wire 32W) of first coil group 31U, second coil group 31V, and third coil group 31W is adjacent in this order in the circumferential direction. It is attached to each of the teeth 21b. *

In the stator core 21 of the present embodiment, a groove 25 that is recessed in the radial direction is provided on the inner peripheral surface 21a1 of the core back 21a where the coil wire 32 faces in the radial direction. That is, the inner peripheral surface 21 a 1 of the core back 21 a has the groove 25. The groove 25 has an opening 25a that opens in the axial direction of the core back 21a. Therefore, the opening 25a by the groove 25 is provided on the upper end surface of the core back 21a in a state in plan view. *

The stator core 21 of the present embodiment further includes a protruding portion 28 that protrudes radially inward from the core back 21a between adjacent teeth 21b. In a state in plan view, the protruding portion 28 includes a pair of protruding portion outer surfaces 28a positioned in the circumferential direction of the outer surfaces and a tip portion connecting the radially inner ends of the pair of protruding portion outer surfaces 28a. 28b. The distal end portion 28b has a flat surface that faces radially inward. In the stator core 21 of the present embodiment, the protruding portion 28 functions as a heat dissipation path of the coil wire 32. *

In the present embodiment, when the stator core 21 is viewed in plan, the grooves 25 are provided on both sides of the teeth 21b. That is, the groove | channel 25 is located in the circumferential direction both sides of the one tooth | gear 21b in the state seen planarly. Thereby, since the shape of the stator core 21 is symmetrical with respect to the central axis T1 of the teeth 21b, the occurrence of magnetic unbalance in the stator 20 is reduced. In the present embodiment, since the number of teeth 21b is nine, 18 grooves 25 are provided on the inner peripheral surface 21a1 of the core back 21a. *

In the present embodiment, the U-phase coil wire 32U attached to the tooth 21b is provided with at least a part of the winding start portion 35U and the connecting lead wire portion 32U1 in the groove 25. That is, the U-phase coil wire 32U of the present embodiment has a lead wire portion (a winding start portion 35U and a connected lead wire portion 32U1) at least partially provided in the groove 25. Specifically, the winding start portion 35U extends along the groove 25 to the upper side of the core back 21a, and is drawn out to the upper side of the stator 20 through the opening 25a. The connecting lead wire portion 32U1 extends along the groove 25 to the upper side of the core back 21a, and is drawn upward of the stator 20 through the opening portion 25a to be connected to the crossover wire 33U. *

Here, the case where the groove | channel 25 is not provided is considered as a comparative example. In this case, since the winding start portion 35U and the connecting lead wire portion 32U1 are in contact with the inner peripheral surface 21a1, the U-phase coil wire 32U cannot be inserted to the base of the tooth 21b, and the U-phase coil wire 32U and the core back There will be a gap between 21a. Thus, when a clearance gap arises in the slot 23, the space factor of a coil will fall.

Here, the tip of the tooth 21 b corresponds to a portion located on the innermost side in the radial direction of the tooth 21 b, more specifically, a portion facing the rotor 10. Further, the base portion of the tooth 21b corresponds to a portion located on the outermost side in the radial direction of the tooth 21b, and more specifically is a connecting portion between the inner peripheral surface 21a1 and the tooth 21b.

On the other hand, in the stator 20 of this embodiment, since at least a part of the winding start portion 35U and the connecting lead wire portion 32U1 is accommodated in the groove 25, the U-phase coil wire 32U is inserted closer to the base portion of the tooth 21b. State. As a result, the gap in the slot 23 is reduced and the space factor of the coil is prevented from being lowered, so that the performance of the motor 100 can be further improved. *

Similarly, in the V-phase coil wire 32V attached to the tooth 21b, at least a part of the winding start portion 35V and the connecting lead wire portion 32V1 is provided in the groove 25. That is, the V-phase coil wire 32 V of the present embodiment has a lead wire portion (a winding start portion 35 V and a connected lead wire portion 32 V 1) at least partially provided in the groove 25. The winding start portion 35U extends along the groove 25 to the upper side of the core back 21a, and is drawn out to the upper side of the stator 20 through the opening 25a. The connecting lead wire portion 32V1 extends along the groove 25 to the upper portion of the core back 21a, and is drawn upward of the stator 20 through the opening portion 25a to be connected to the crossover wire 33V. Therefore, the V-phase coil wire 32V is inserted closer to the base of the teeth 21b. *

Similarly, in the W-phase coil wire 32W attached to the tooth 21b, at least a part of the winding start portion 35W and the connecting lead wire portion 32W1 is provided in the groove 25. That is, the W-phase coil wire 32W of the present embodiment has a lead wire portion (winding start portion 35W and connecting lead wire portion 32W1) at least partially provided in the groove 25. The winding start portion 35W extends along the groove 25 to the upper side of the core back 21a, and is drawn out to the upper side of the stator 20 through the opening 25a. The connecting lead wire portion 32W1 extends along the groove 25 to the upper portion of the core back 21a, and is drawn upward of the stator 20 through the opening portion 25a to be connected to the crossover wire 33W. Therefore, the W-phase coil wire 32W is inserted to a position closer to the base of the tooth 21b. *

In the present embodiment, a part of the mold resin 50 enters the groove 25. That is, since the groove 25 functions as a resin filling path when filling the mold resin 50, the mold resin 50 is disposed between the core back 21 a and the coil wire 32 without any gap. When filling the mold resin, since the mold resin 50 passes through the inside of the groove 25, the mold resin 50 can be filled efficiently. *

FIG. 5 is a plan view of the stator core. When viewed in a plan view, the teeth 21b of the present embodiment have a pair of teeth outer surfaces 21c positioned in the circumferential direction among the outer surfaces in a plan view, and radially inner ends of the pair of teeth outer surfaces 21c. A tip portion 21d that connects the portions. The tip portion 21d has a surface that faces radially inward. The pair of teeth outer surfaces 21c are parallel to each other. That is, the distance between the pair of teeth outer surfaces 21c is constant.

Further, a recess 21d1 that is recessed radially outward is provided at the tip 21d of the tooth 21b.

In other words, the thickness of the teeth 21b of the present embodiment is substantially constant from the base 21A to the tip 21B. Therefore, the cross-sectional area of the tooth 21b by the surface orthogonal to the central axis T1 of the tooth 21b does not change from the base 21A to the tip 21B. In this specification, the teeth 21b having a shape whose thickness is substantially constant from the base 21A to the tip 21B are referred to as umbrellaless type teeth. *

According to the teeth 21b made of an umbrella-less type as in the present embodiment, the coil wire 32 that is densely wound in advance by a winding device is inserted from the tip 21B side toward the base portion 21A side, so that the space factor is reduced. The high coil wire 32 can be easily attached.

On the other hand, since the thickness of the teeth 21b is substantially constant, for example, the coil wire 32 may fall off the teeth 21b during the assembly of the stator 20 or the position of the coil wire 32 may be displaced.

On the other hand, in the stator 20 of the present embodiment, as shown in FIG. 3, the coil group 31 (first coil group 31U, first coil group) provided on the stator core 21 in a state where the connecting wire 33 is bent radially outward. 2 coil group 31V and 3rd coil group 31W). Hereinafter, the configuration of the first coil group 31U will be described as an example, but the same applies to the second coil group 31V and the third coil group 31W. *

The connecting wire 33U in the first coil group 31U has a portion in which the curvature of the connecting wire 33U in a plane orthogonal to the axial direction is larger than the curvature R1 of the core back 21a. Here, the curvature R1 of the core back 21a is defined by the radially outer peripheral surface. *

The connecting wire 33U has a wiring portion 37U that overlaps the core back 21a when the stator core 21 is viewed in the axial direction. Thus, since the wiring part 37U of the crossover wire 33U is positioned on the core back 21a, the crossover wire 33 is prevented from entering between the U-phase coil wire 32U and the core back 21a in the radial direction. Therefore, U-phase coil wire 32U is satisfactorily attached to teeth 21b, and a gap is hardly generated between U-phase coil wire 32U and core back 21a. Furthermore, the crossover wire 33U hardly prevents the insertion of the V-phase coil wire 32V or the W-phase coil wire 32W attached to the teeth 21b after the U-phase coil wire 32U.

Moreover, the crossover wire 33U is located on the radially outer side of the connecting lead wire portions 32V1 and 32W1 of the other coil group 31 (the second coil group 31V and the third coil group 31W). Therefore, the connecting wire 33U does not prevent the insertion of the V-phase coil wire 32V or the W-phase coil wire 32W attached to the tooth 21b after the U-phase coil wire 32U.

Further, the crossover wire 33U has a connecting portion 38U that is connected to the coil wire 32 (U-phase coil wire 32U) on the radially inner side of the core back 21a. Since the connecting portion 38U is located on the radially inner side with respect to the wiring portion 37U, the connecting wire 33U is connected to the connecting portion 38U in a curved state. Therefore, when the stator core 21 is viewed in the axial direction, the curvature R2 of the connecting portion 38U is larger than the curvature R3 of the wiring portion 37U. Thus, by positioning the connecting portion 38U radially inward of the core back 21a, it is possible to easily provide a portion with a large curvature in the crossover wire 33U. Note that the curvature R3 of the wiring portion 37U overlapping the core back 21a is substantially the same as the curvature R1 of the core back 21a. *

In the first coil group 31U of the present embodiment, the crossover wire 33U is elastically deformed. In the state where the first coil group 31U is removed from the stator core 21 as described above, the connecting wire 33 extends in a straight line. Therefore, an elastic force is generated in the connecting wire 33U that is elastically deformed so as to return to the straight shape. A force for making the entire curvature uniform acts on the crossover wire 33U having the connecting portion 38U having a relatively large curvature so as to match the wiring portion 37U. Accordingly, since the connecting portion 38U extends radially outward, a force is applied to press the U-phase coil wire 32U connected to the connecting portion 38U against the inner peripheral surface 21a1 of the core back 21a. *

As described above, according to the first coil group 31U of the present embodiment, the U-phase coil wire 32U can be pressed against the inner peripheral surface 21a1 of the core back 21a by the elastic force generated in the connecting wire 33U. Thereby, the U-phase coil wire 32U can be easily and stably attached to the umbrella-less teeth 21b without using a special mechanism or member. Therefore, during the assembly of the stator 20, it is possible to prevent the U-phase coil wire 32U from dropping from the teeth 21b and the U-phase coil wire 32U from being misaligned with respect to the teeth 21b. *

Further, since at least a part of the winding start portion 35U and the connecting lead wire portion 32U1 is accommodated in the groove 25, a gap generated between the U-phase coil wire 32U and the core back 21a is reduced. Thereby, U-phase coil wire 32U can be favorably pressed against inner peripheral surface 21a1 of core back 21a. *

Although explanation is omitted, since the second coil group 31V and the third coil group 31W have the same structure, the same effect can be obtained. That is, according to the stator 20 of this embodiment, the V-phase coil wire 32V and the W-phase coil wire 32W can be easily and stably attached to the umbrella-less type tooth 21b without using a special mechanism or member. . Therefore, it is possible to prevent the V-phase coil wire 32 V and the W-phase coil wire 32 W from dropping off from the teeth 21 b and the occurrence of positional deviation. Further, a gap generated between the V-phase coil wire 32V and the W-phase coil wire 32W and the core back 21a is reduced. Thereby, the V-phase coil wire 32V and the W-phase coil wire 32W can be favorably pressed against the inner peripheral surface 21a1 of the core back 21a. *

In the following description, the U-phase coil wire 32U, the V-phase coil wire 32V, and the W-phase coil wire 32W are collectively referred to simply as the coil wire 32. *

In the stator core 21 of the present embodiment, a recess 27 that is recessed radially inward is provided at a position corresponding to the tooth 21b on the outer peripheral surface 21a2 of the core back 21a. That is, the recessed part 27 is located in the radial direction outer side of the teeth 21b. The recess 27 is used for positioning when the stator core 21 is attached to the housing 3 of the motor case 2, for example. The number of the concave portions 27 may be at least one, but in the stator core 21 of the present embodiment, the nine concave portions 27 are evenly arranged in the circumferential direction, thereby generating magnetic unbalance in the stator 20. Can be reduced. *

In the present embodiment, the central axis T1 of the tooth 21b along the radial direction is perpendicular to the surface along the inner peripheral surface 21a1. That is, the inner peripheral surface 21a1 of the core back 21a has a shape that is recessed outward in the radial direction as the distance from the base portion of the teeth 21b increases. According to this structure, the capacity | capacitance of the slot 23 can be enlarged compared with the case where the inner peripheral surface 21a1 of the core back 21a is cylindrical. *

The central axis T1 and the inner peripheral surface 21a1 being vertical means that the angle between the central axis T1 and the inner peripheral surface 21a1 is not limited to 90 degrees, and the slot capacity is larger than that of the cylindrical inner peripheral surface as described above. If it is an aspect that can be enlarged, it may be slightly deviated from the vertical. *

Further, in a state in which the stator core 21 is viewed in plan, the width H2 of the portion of the core back 21a where the protruding portion 28 is provided is preferably equal to or greater than the width H1 of the portion of the core back 21a where the groove 25 is provided. .

In the present embodiment, since the concave portion 27 is provided on the outer peripheral surface 21a2 of the core back 21a, the width H1 is defined by the minimum width between the bottom surface 27a of the concave portion 27 and the groove 25. When the recess 27 is not provided, the width H1 is defined by the width in the radial direction between the groove 25 and the outer peripheral surface 21a2. In the present embodiment, since the protruding portion 28 is provided on the inner peripheral surface 21a1 of the core back 21a, the width H2 is a radial direction between the intersection of the protruding portion 28 on the inner peripheral surface 21a1 and the outer peripheral surface 21a2. Defined by width.

In the stator core 21, it is desirable that the width H2 is not less than the width H1 (H2 ≧ H1). In the stator core 21 of the present embodiment, the width H2 and the width H1 are equal (H2 = H1). Thereby, it is possible to reduce the occurrence of magnetic saturation due to the narrow width of the core back 21a due to the configuration in which the outer surface 28a of the projecting portion 28 and the inner peripheral surface 21a1 of the core back 21a intersect perpendicularly. Therefore, it is possible to suppress a decrease in the magnetic characteristics of the stator 20 due to the protrusions 28. *

Further, the occurrence of magnetic saturation due to the narrowing of the core back width by the groove 25 can be reduced. Therefore, it is possible to suppress a decrease in magnetic characteristics of the stator 20 due to the provision of the grooves 25. *

In the present embodiment, the case where the width H2 and the width H1 are equal is described as an example, but the width H2 may be larger than the width H1 (H2> H1). In this case, the effect of suppressing the deterioration of the magnetic properties of the stator 20 due to the perpendicular crossing of the protruding portion outer surface 28a of the protruding portion 28 and the inner peripheral surface 21a1 of the core back 21a can be obtained more significantly. it can. *

Moreover, in this embodiment, the protrusion part outer surface 28a located in the circumferential direction among the outer surfaces of the protrusion part 28 is outside the protrusion part in the circumferential direction among the outer surfaces of the teeth 21b adjacent to the protrusion part outer surface 28a. It is parallel to the teeth outer surface 21c facing the side surface 28a, and the protruding portion outer surface 28a intersects the surface along the inner peripheral surface 21a1 of the core back 21a perpendicularly. That is, the tooth outer surface 21c of the tooth 21b intersects the surface along the inner peripheral surface 21a1 perpendicularly. In addition, that the protrusion outer surface 28a and the teeth outer surface 21c are parallel includes a state where the protrusion outer surface 28a and the teeth outer surface 21c are substantially parallel to each other. That the protrusion outer surface 28a and the surface along the inner peripheral surface 21a1 intersect perpendicularly includes a state in which the protrusion outer surface 28a and the inner peripheral surface 21a1 intersect substantially perpendicularly. *

This is equivalent to the shape of the inner peripheral surface 21a1 of the core back 21a projecting radially outward as the distance from the base portion of the tooth 21b increases. According to this structure, the capacity | capacitance of the slot 23 can be enlarged compared with the case where the inner peripheral surface 21a1 of the core back 21a is made into a cylindrical surface. *

The protrusion outer surface 28a and the teeth outer surface 21c being parallel are not limited to the case where the protrusion outer surface 28a and the teeth outer surface 21c are completely parallel, and the slot capacity is affected. Allow a state where each other is tilted so as not to reach. In addition, the protrusion outer surface 28a and the inner peripheral surface 21a1 being vertical means that the angle formed by the protrusion outer surface 28a and the inner peripheral surface 21a1 is not limited to 90 degrees, as compared with the circular inner peripheral surface as described above. As long as the slot capacity can be increased, the slot capacity may be slightly deviated from the vertical. *

Further, when viewed in a plan view, the protruding portion 28 has a tapered shape in which the radially inner width H4 is narrower than the radially outer width H3. Thereby, since the volume of the front end side of the protrusion part 28 becomes small, a predetermined slot capacity can be secured by suppressing the reduction of the slot capacity due to the provision of the protrusion part 28.

Moreover, the front-end | tip part 28b of the protrusion part 28 has a flat surface which faces a radial inside. Therefore, the tip 28b is not sharp and sharp. Thereby, since it becomes easy to apply | coat an insulating coating film with respect to the front-end | tip part 28b, insulation can be provided over the stator core 21 whole.

In addition, in a plan view, the virtual plane MM including the protruding portion outer surface 28a of the protruding portion 28 does not intersect with the teeth 21b adjacent to the protruding portion 28. That is, the length in the radial direction of the teeth 21b is set so that the tip 21d does not intersect the virtual plane MM. *

Here, the coil wire 32 is arrange | positioned between the protrusion part outer surface 28a of the protrusion part 28, and the teeth outer surface 21c of the teeth 21b. If the outer shape of the coil wire 32 and the virtual plane MM intersect, when the coil wire is attached to the second tooth adjacent to the first tooth already attached with the coil wire, the coil wire is changed to the coil wire attached to the first tooth. Contact. *

The coil wire 32 of the present embodiment has a shape that does not intersect with the virtual plane MM in a plan view. In order to increase the number of turns of the coil wire by increasing the outer shape of the coil wire 32 as much as possible without crossing the virtual plane MM, the outer shape of the coil wire 32 may be formed along the virtual plane MM. *

The outer diameter D1 of the coil wire 32 on the teeth base side is larger than the outer diameter D2 of the teeth tip side. More specifically, when viewed in a plan view, the coil wire 32 of the present embodiment includes the same-diameter portion 24a having a constant outer diameter, and the outer diameter is radially inward, as shown by a two-dot chain line in FIG. And an inclined portion 24b that becomes smaller as it goes to. The outer diameter of the same diameter portion 24a is constant in the radial direction. The constant outer diameter is not limited to an aspect in which the outer diameter does not change at all, but includes a state in which the outer diameter is substantially constant. The same diameter portion 24a is located on the radially outer side with respect to the inclined portion 24b, and the surface 24b1 located in the circumferential direction among the outer surfaces of the inclined portion 24b is outside the teeth 21b on both sides in the circumferential direction of the coil wire 32. It is parallel to the surface 21e facing the inclined portion 24b in the circumferential direction of the teeth outer surface 21c. That the surface 24b1 and the surface 21e are parallel includes a substantially parallel state.

That is, in the coil wire 32 of the present embodiment, the outer line of the same-diameter portion 24a extends from the inner peripheral surface 21a1 toward the radially inner side along the protruding portion outer surface 28a of the protruding portion 28, and the outer line of the inclined portion 24b. Extends along the virtual plane MM.

According to the stator core 21 of the present embodiment, since the tooth 21b and the virtual plane MM do not intersect, when the coil wire 32 is attached to the tooth 21b, contact with the other coil wire 32 attached to the adjacent tooth 21b is prevented. Can be prevented. Further, as described above, since the coil wire 32 having the teeth base side outer diameter D1 larger than the teeth tip side outer diameter D2 is provided, the coil wire 32 can be wound while preventing interference between adjacent coil wires 32. You can increase the number. *

As described above, according to the stator 20 of the present embodiment, the coil wire 32 can be easily and stably attached to the umbrella-less type tooth 21b without using a special mechanism or member. Therefore, during the assembly of the stator 20, it is possible to prevent the coil wire 32 from dropping from the tooth 21 b and the occurrence of the positional deviation of the coil wire 32 with respect to the tooth 21 b. Therefore, the highly reliable stator 20 is provided. *

Moreover, in the stator 20 of this embodiment, the teeth outer surface 21c of the teeth 21b and the inner peripheral surface 21a1 of the core back 21a intersect perpendicularly. Thereby, when inserting the coil wire 32 in the teeth 21b, the inner peripheral surface 21a1 of the core back 21a and the coil wire 32 are in good contact. That is, a gap is not easily generated between the inner peripheral surface 21a1 of the core back 21a and the coil wire 32. Therefore, the occurrence of collapse of the coil wire 32 can be prevented. Further, the contact area between the coil wire 32 and the core back 21a can be increased. *

In the stator 20 of the present embodiment, the central axis T1 of the tooth 21b and the inner peripheral surface 21a1 are perpendicular to each other. That is, the tooth outer surface 21c and the inner peripheral surface 21a1 of the tooth 21b are perpendicular to each other. Furthermore, the protrusion outer surface 28a of the protrusion 28 and the surface along the inner peripheral surface 21a1 of the core back 21a are perpendicular. Thereby, since the capacity | capacitance of the slot 23 becomes large compared with the case where the internal peripheral surface 21a1 is made into a cylindrical surface, the winding number of the coil wire 32 arrange | positioned in the slot 23 can be increased. Therefore, the performance of the motor 100 can be further improved. *

Moreover, in the stator 20 of this embodiment, since the contact area of the coil wire 32 and the core back 21a increases, the heat generated in the coil wire 32 is efficiently transmitted to the core back 21a. Thereby, since the heat dissipation of the coil wire 32 improves, the increase in coil resistance by a temperature rise can be suppressed. Therefore, the performance of the motor 100 can be further improved. *

Moreover, the stator 20 of this embodiment is provided with the protrusion part 28 between the adjacent teeth 21b. In this configuration, the heat generated in the coil wire 32 is transmitted to the core back 21a via the protruding portion 28 and released to the outside. That is, the protrusion 28 functions as a heat dissipation path for the coil wire 32. Since the protrusion part 28 is comprised with a member with high heat conductivity compared with air or resin, the heat dissipation of the coil wire 32 can be improved more. *

Moreover, in the stator core 21 of this embodiment, the groove | channel 25 is provided in the both sides of the teeth 21b. Thereby, it can respond also to the coil wire which consists of various winding patterns different from the form shown in

Drawing

4a and 4b. That is, for example, it is possible to deal with a case in which two lead wires projecting to the other side in the axial direction of the coil wire 32, or a case in which the lead wire lead direction is opposite to the coil wire 32 in the radial direction, etc. . Therefore, the same effect (an improvement in space factor and heat dissipation) can be obtained in a motor using coil wires of various winding patterns. *

A jig is used to attach the coil wire 32 to the tooth 21b. FIG. 6 is a plan view of a jig used for attaching the coil wire 32, and FIG. 7 is an explanatory view of attaching the coil wire 32 to the stator core 21. *

A coil wire attachment jig 60 shown in FIG. 6 has a holding portion 61 that holds the coil wire 32 and a shaft 62 that passes through the center of the holding portion 61. The shaft 62 defines the center of the coil wire attachment jig 60 and functions as a gripping part when moving the coil wire attachment jig 60. In a state viewed from above, the holding portion 61 has three rod-like coil wire holding portions 61b extending radially around the circular main body portion 61a. That is, the holding unit 61 can simultaneously hold the three coil wires 32 of the coil group 31. When the coil wire attaching jig 60 is attached to the stator core 21, the holding portion 61 is set so that the position of each coil wire holding portion 61b is set so that the coil wire holding portion 61b is disposed at a position facing the teeth 21b. The

Moreover, the convex part 61c is provided in the front-end | tip of each coil wire holding part 61b. The coil wire holding portion 61b has a length such that the protruding portion 61c at the tip is exposed while the coil wire 32 is held.

A manufacturing process of the stator 20 will be described. First, as shown in FIG. 7, a coil wire attachment jig 60 in which each coil wire 32 of the coil group 31 is attached to each coil wire holding portion 61b is attached in a stator core 21 held on a pedestal (not shown). At this time, the coil wire attachment jig 60 is inserted into the stator core 21 so that the shaft 62 of the coil wire attachment jig 60 and the center axis J of the stator core 21 are aligned, and the convex portion 61c of the coil wire holding portion 61b. Is inserted into the recess 21d1 of the tooth 21b. Thereby, the coil wire attachment jig 60 is securely attached to the stator core 21. *

Subsequently, the coil wires 32 are attached to the teeth 21b by sliding the coil wires 32 held by the coil wire holding portion 61b radially outward. By using the coil wire attachment jig 60, the coil wire 32 can be attached to the three teeth 21b in the same process. *

In the present embodiment, since the coil group 31 is held by the coil wire mounting jig 60 in a state where the crossover wire 33 is bent radially outward, the crossover wire 33 connected to the coil wire 32 attached to the tooth 21b is , Bent radially outward. Therefore, the coil group 31 can press the coil wire 32 against the inner peripheral surface 21a1 of the core back 21a by the elastic force generated in the connecting wire 33. Thereby, during the assembly of the stator 20, the coil wire 32 can be prevented from dropping off from the teeth 21 b and the positional deviation of the coil wire 32 with respect to the teeth 21 b can be suppressed. *

Subsequently, after the coil wire 32 is attached to the coil wire attachment jig 60 removed from the stator core 21, the teeth 21b to which the coil wire 32 is not attached and the coil wire holding portion 61b are aligned with the stator core 21. The coil wire attachment jig 60 is attached, and the coil wire 32 is attached to each tooth 21b. In the same manner, the same operation is repeated until the coil wires 32 are attached to all the teeth 21b. Since the stator core 21 of the present embodiment has nine teeth 21b, the attachment of the coil wires 32 to all the teeth 21b is completed by repeating the attachment operation by the coil wire attachment jig 60 three times.

As described above, the attachment of the coil wire 32 to each tooth 21b of the stator core 21 is completed. In this way, the manufacture of the stator 20 is completed.

After the stator 20 manufactured as described above is accommodated in the housing 3, the stator 20 and the housing 3 are fixed with a mold resin 50. A jig is used for filling the resin into the housing 3. FIG. 8 is a plan view of a jig used for resin filling. *

A resin filling jig 70 shown in FIG. 8 includes a pedestal 71, a mold member 72, and a screw member 73. The pedestal 71 has a recess 71 a for holding the housing 3. The recess 71 a includes a recess 71 b that protrudes below the bottom plate portion 3 a of the housing 3, and an opening 71 c that connects the recess 71 b and penetrates the pedestal 71. The recess 71b accommodates the bearing holding portion 3c. The mold member 72 has a first portion 72A, a second portion 72B, and a third portion 72C. The first portion 72A, the second portion 72B, and the third portion 72C are made of a cylindrical member, and the outer diameter decreases in the order of the first portion 72A, the second portion 72B, and the third portion 72C. That is, the mold member 72 has an annular end surface 72a formed by projecting the end portion of the first portion 72A radially outward at the connection portion between the first portion 72A and the second portion 72B. The outer diameter of the first portion 72 A is equal to or larger than the outer diameter of the rotor 10. *

In the resin filling step, the surface of the first portion 72A located on the opposite side of the second portion 72B is in contact with the housing 3 accommodated in the recess 71a of the pedestal portion 71. The mold member 72 includes a ring-shaped recess 72b provided in a contact portion with the housing 3 in the first portion 72A, a ring-shaped seal member 74 disposed in the recess 72b, and a screw hole 72c. The seal member 74 is, for example, an O-ring. *

The mold member 72 is fixed to the pedestal portion 71 by a screw member 73 accommodated in the opening 71 c of the pedestal portion 71 while being in contact with the housing 3. As a result, the housing 3 is sandwiched and held between the pedestal 71 and the mold member 72, so that the housing 3 is securely fixed to the resin filling jig 70. In the state where the mold member 72 is fixed to the pedestal portion 71, the end surface 72 a is located below the cutout portion 6 (on the coil wire 32 side). *

After the mold member 72 is installed in the housing 3 in this way, the resin material 50a is filled from above the peripheral wall portion 3b of the housing 3 installed on a horizontal plane. Specifically, the resin material 50 a is filled until the upper surface of the resin material 50 a reaches the height of the end surface 72 a of the mold member 72. By filling the resin material once, not only the coil and the stator core can be fixed, but also the stator and the housing can be fixed. *

Since the end surface 72a is positioned below the notch 6 as described above, when the resin material 50a is filled up to the height of the end surface 72a, the mold resin 50 obtained by curing the resin material 50a has substantially the same height as the end surface 72a. Is provided. Therefore, the mold resin 50 does not leak out from the notch 6 located above the end surface 72a. Since the mold member 72 has the end surface 72a, the filling amount of the resin material 50a can be visually recognized, and the filling amount can be controlled. *

In addition, a space between the mold member 72 and the bottom plate portion 3 a of the housing 3 is sealed with a seal member 74. Therefore, it is possible to prevent the resin material 50a filled between the housing 3 and the mold member 72 from leaking into the recess 71b. Therefore, the mold resin 50 can be molded into a predetermined shape by properly arranging the resin material 50a in the space formed by the housing 3 and the mold member 72. Thereby, the mold resin 50 has an opening for accommodating the rotor 10. *

After the molding resin 50 is formed, the mold member 72 and the base portion 71 are separated by removing the screw member 73. Thereafter, the housing 3 is removed from the pedestal 71, the rotor 10 is disposed in the opening of the mold resin 50, the rotation detection sensor 41 is disposed above the rotor 10, and then the lid 4 having the circuit board 40 is attached to the housing 3. The motor 100 of the embodiment is manufactured. *

According to the motor 100 of the present embodiment, since the stator 20 that can improve the coil space factor and heat dissipation is provided, a high-performance motor can be provided. *

Although one embodiment of the present invention has been described above, each configuration in the embodiment and combinations thereof are examples, and addition, omission, replacement, and other configurations of the configuration are within the scope not departing from the gist of the present invention. It can be changed. Further, the present invention is not limited by the embodiment. *

In the above embodiment, the tooth 21b whose thickness does not change between the base portion 21A and the tip 21B is taken as an example of the umbrella-less type tooth shape, but the shape of the tooth is not limited to this. For example, the shape which had the bulging part in the middle part from the front-end | tip 21B of the teeth 21b to 21 A of bases may be sufficient. The bulging portion has a shape in which the width in the direction orthogonal to the axis of the tooth 21b bulges to such an extent that the coil wire 32 can be inserted. *

In the above-described embodiment, the case where the mold resin 50 is disposed has been described as an example. However, since the present invention can stably hold the coil wire 32 on the teeth 21b, the mold resin 50 can be omitted.

DESCRIPTION OF SYMBOLS 10 ... Rotor, 20 ... Stator, 21 ... Stator core, 21a ... Core back, 21A ... Base part, 21b ... Teeth, 21B ... Tip, 21c ... Teeth outer surface, 32 ... Coil wire, 24a ... Same diameter part, 24b ... Inclined part , 24b1... Surface (a surface located in the circumferential direction among the outer surfaces of the inclined portion), 28a... The protruding portion outer surface, 25... Groove, 28. 21a1 ... inner peripheral surface, 21e ... surface (surface facing the inclined portion in the circumferential direction), H1 ... width (width of the portion provided with the groove), H2 ... width (width of the portion provided with the protruding portion), MM ... virtual plane, D1 ... outer diameter (outer diameter on the tooth base side of the coil wire), D2 ... outer diameter (outer diameter on the tip end side of the tooth).

Claims

A stator core having an annular core back extending in the circumferential direction around an axis extending in one direction, and a plurality of teeth extending radially inward from the core back;

A plurality of coil wires provided on the plurality of teeth;

Between adjacent teeth, and a protruding portion protruding radially inward from the core back,

Of the outer surfaces of the protrusions, the protrusion outer surface located in the circumferential direction is the teeth outer surface facing the protrusion outer surface in the circumferential direction among the outer surfaces of the teeth adjacent to the protrusion outer surface. Parallel to

The protrusion outer surface intersects perpendicularly with the inner peripheral surface of the core back,

Stator.
The teeth have a substantially constant thickness from the base to the tip.

The stator according to claim 1.
A groove recessed in the radial direction provided on a surface of the inner surface of the core back facing the radial direction of the coil wire;

The coil wire has a leader portion provided at least partially in the groove;

When the stator core is viewed in the axial direction, the width of the portion of the core back where the protruding portion is provided is equal to or greater than the width of the portion of the core back where the groove is provided.

The stator according to claim 1 or 2.
When the stator core is viewed in the axial direction, the protruding portion has a tapered shape in which the width on the radially inner side is narrower than the width on the radially outer side,

The stator according to any one of claims 1 to 3.
The tip of the protrusion has a flat surface facing radially inward,

The stator according to any one of claims 1 to 4.
The virtual plane including the protrusion outer surface of the protrusion and the teeth adjacent to the protrusion do not intersect.

The stator according to any one of claims 1 to 5.
When the stator core is viewed in the axial direction, the outer diameter of the coil base side of the coil wire is larger than the outer diameter of the tooth tip side of the coil wire.

The stator according to any one of claims 1 to 6.
The coil wire is

The same diameter part where the outer diameter is constant,

An inclined portion that decreases as the outer diameter goes radially inward,

The same-diameter portion is located on the radially outer side with respect to the inclined portion, and the surface located in the circumferential direction among the outer surfaces of the inclined portion is the outer surface of the tooth adjacent to both sides in the circumferential direction of the coil wire. Is parallel to the surface facing the inclined portion in the circumferential direction,

The stator according to claim 7.
A resin provided between the coil wire and the stator core;

The stator according to any one of claims 1 to 8.
The stator according to any one of claims 1 to 9,

A rotor,

motor.