WO2020121806A1

WO2020121806A1 - Stator, and motor using the same

Info

Publication number: WO2020121806A1
Application number: PCT/JP2019/046253
Authority: WO
Inventors: 博米田; 渡辺　彰彦; 浩勝国友
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2018-12-13
Filing date: 2019-11-26
Publication date: 2020-06-18
Also published as: CN113039704A; CN113039704B; JP7394396B2; JPWO2020121806A1

Abstract

A stator 100 includes a plurality of teeth 10 arranged on a yoke 20, insulators 50 mounted on the respective teeth 10, and a coil 40 that is configured by a conducting wire 41 having a rectangular cross section and is wound around the insulators 50. Each of the insulators 50 includes a conducting wire winding portion 52, and a first flange portion 51 and a second flange portion 53 at both ends of the conducting wire winding portion 52. A plurality of protrusions 60 are provided on corner portions 52e1 to 52e4 of the conducting wire winding portion 52. Each of the protrusions 60 has a first surface 50a facing the first flange portion 51 and a second surface 60b which faces the second flange portion 53 and is a convex curved surface.

Description

Stator and motor using the same

The present invention relates to a stator, particularly a stator around which a conductor wire having a rectangular cross section is wound, and a motor using the stator.

Demand for motors has increased in recent years in industrial and vehicle applications. Among them, there is a demand for improving the efficiency of the motor, and it is known that improving the space factor of the coil arranged in the slot of the stator is effective for improving the efficiency of the motor. By increasing the space factor of the coil, it is possible to suppress the loss caused by the current flowing through the coil when the motor is driven.

Conventionally, by forming a coil using a conductor wire having a rectangular cross section, that is, a rectangular wire, or providing a groove for guiding and holding the conductor wire on the surface of an insulator around which the conductor wire is wound, the coil in the slot is formed. There are known techniques for improving the space factor of (see, for example, Patent Documents 1 to 5).

Japanese Patent Laid-Open No. 2000-350420 JP, 2007-267492, A JP, 2017-169310, A Japanese Patent No. 4271495 Patent No. 5252807

By the way, in order to increase the output of the motor, a so-called multi-layered coil is often used in which a coil is formed by winding conductive wires so as to be sequentially stacked from the surface of the insulator.

However, when conducting wires in multiple layers, for example, a bulge is likely to occur at the rewinding part from the conducting wire of the first layer to the conducting wire of the second layer, and the winding disorder of the conducting wire is likely to occur. In particular, when a coil of a multi-layer winding is formed by using a rectangular wire, the conductor wires of the first layer and the conductor wire of the second layer are wound around the insulator with their flat surfaces abutting each other, so that the conductor wire slips on the contact surface. It becomes easier and the above winding disorder becomes more likely to occur.

　In this way, if winding of the conducting wire is disturbed, the space factor of the coil will decrease, and it was not possible to sufficiently improve the efficiency of the motor.

The present invention has been made in view of the above points, and an object thereof is to provide a stator that suppresses winding disorder at the rewound portion of a conductive wire and that has a high space factor of a coil, and a motor using the same. is there.

In order to achieve the above object, a stator according to the present invention is provided with an annular yoke and a predetermined gap in the circumferential direction of the yoke, and from the inner circumference of the yoke in the radial direction of the yoke. A stator including a plurality of teeth, a plurality of insulators mounted on each of the plurality of teeth, and a plurality of coils each having a rectangular cross section and wound around each of the plurality of insulators. Then, the insulator has a tubular wire winding portion around which the wire is wound, and a wire guide groove that is provided at one end of the wire winding portion and that guides the wire to the wire winding portion. A first flange portion and a second flange portion provided at the other end of the conductor winding portion, wherein the conductor winding portion has a first end surface continuous with a bottom surface of the conductor guide groove and the first end surface. A first end surface and a second end surface that faces each other in the axial direction of the stator; and a first side surface that is provided from a circumferential edge of the first end surface to a circumferential edge of the second end surface and that faces each other in the circumferential direction. And a plurality of second side surfaces and at least a corner portion of the conductive wire winding portion for winding the conductive wire around the first end surface so as to form a predetermined angle with respect to a direction orthogonal to the radial direction. The plurality of protrusions are provided at a predetermined distance from each other in the radial direction, and the protrusions are provided on the first surface and the second collar portion facing the first collar portion. And a second surface facing each other, and at least one of the first surface and the second surface has a convex curved surface.

According to this configuration, the conductor wire having a rectangular cross section can be stably wound in an aligned and multi-layered manner on the insulator.

The motor according to the present invention is characterized by at least including the stator and a rotor provided at a predetermined distance from the stator.

According to this configuration, the conductor wire is wound around the insulator in a line and in multiple layers, so that the space factor of the coil can be increased and a highly efficient motor can be realized.

According to the stator of the present invention, a conductor wire having a rectangular cross section can be stably wound in an aligned and multi-layered manner on an insulator. Further, according to the motor of the present invention, the space factor of the coil can be increased and a highly efficient motor can be realized.

FIG. 1 is a sectional view of a motor according to the first embodiment of the present invention. FIG. 2 is a schematic diagram of the insulator. FIG. 3 is a schematic view of a main part of the stator. FIG. 4 is a schematic view of a main part of the stator viewed from the upper side in the axial direction. FIG. 5 is a sectional view taken along line VV of FIG. FIG. 6 is a schematic diagram for explaining the relationship between the inclination angle of the conductor wire with respect to the radial direction and the distance between the conductor wires adjacent in the radial direction. FIG. 7 is a schematic diagram illustrating the relationship between the receding angle of the slot and the inclination angle of the conductor wire with respect to the radial direction. FIG. 8: is a figure which shows the structure of the winding equipment of a conducting wire. FIG. 9 is a process explanatory view showing a process in which the conductor wire is wound around the insulator. FIG. 10A is a schematic diagram showing an arrangement of conductors on a conductor winding portion when a protrusion is not provided. FIG. 10B is a schematic diagram showing an arrangement of conductors on a conductor winding portion when a protrusion is provided. FIG. 11 is a schematic view of another insulator. FIG. 12 is a schematic diagram of the first insulator according to the modification. FIG. 13 is a schematic diagram of the second insulator according to the modification. FIG. 14 is a schematic diagram of a third insulator according to the modification. FIG. 15 is a schematic diagram of a fourth insulator according to the modification. FIG. 16 is a schematic diagram of an insulator according to the second embodiment of the present invention. FIG. 17 is a schematic view of a main part of the stator viewed from the lower side in the axial direction. FIG. 18A is a schematic sectional view of an essential part of the stator according to the third embodiment of the present invention. FIG. 18B is a schematic sectional view of a main part of a stator for comparison. FIG. 19A is a schematic sectional view of an essential part of the stator according to the fourth embodiment of the present invention. FIG. 19B is a schematic sectional view of a main part of a stator for comparison. FIG. 20 is a schematic cross-sectional view of a main part of a stator filled with a heat dissipation material.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The description of the preferred embodiments below is merely exemplary in nature and is in no way intended to limit the invention, its applications, or its uses.

(Embodiment 1)
[Motor configuration]
FIG. 1 shows a cross-sectional view of the motor according to this embodiment. In the following description, the radial direction of the motor 1000 and the stator 100 is the “radial direction”, the outer peripheral direction is the “circumferential direction”, and the direction in which the output shaft 210 of the motor 1000 extends (direction perpendicular to the plane of FIG. 1). May be referred to as "axial direction". Further, since the output shaft 210 substantially coincides with the central axis of the stator 100, the direction in which the central axis of the stator 100 extends may be referred to as the “axial direction”. In the radial direction, the center side of the stator 100 may be referred to as the inner side in the radial direction, and the outer peripheral side may be referred to as the outer side in the radial direction.

The motor 1000 has a stator 100 and a rotor 200. Although the motor 1000 has components other than these, for example, components such as a motor case and a bearing that supports the output shaft 210, illustration and description thereof will be omitted for convenience of description. The motor 1000 is a so-called inner rotor type motor, but is not particularly limited to this and may be an outer rotor type motor.

The stator 100 includes an annular yoke 20, a plurality of teeth 10 connected to the inner circumference of the yoke 20 and provided at equal intervals along the inner circumference, and a plurality of teeth mounted on each of the plurality of teeth 10. It has an insulator 50 (see FIG. 2), a plurality of slots 30 configured as a space between the teeth 10 adjacent in the circumferential direction, and a plurality of coils 40 housed in the plurality of slots 30. The rotor 200 is arranged on the outer side in the radial direction with a certain distance from the rotor 200.

Note that, in the following description, when it means a singular number, it is referred to as Tooth 10, and when it means a plurality, it is referred to as Teeth 10. Further, in the case where either one or a plurality of numbers may be used, they are referred to as teeth 10.

The teeth 10 are formed, for example, by stacking electromagnetic steel plates containing silicon and the like and then punching them. The yoke 20 is an annular member formed by connecting a plurality of split yokes 21 in the circumferential direction. Similar to the teeth 10, the split yoke 21 is formed by stacking electromagnetic steel plates and punching them. The tooth 10 is provided in each of the split yokes 21.

The coil 40 is a component formed by winding a conductor wire 41 (see FIG. 3) having a rectangular cross section, and the coil 40 is mounted on the tooth 10 with the insulator 50 sandwiched therebetween and is housed in the slot 30. .. The insulator 50 is a component made of an insulating material attached to the tooth 10 and the split yoke 21, and electrically separates the coil 40 from the tooth 10 and the yoke 20. The structure of the insulator 50 will be described in detail later. In the present embodiment, the coil 40 may be referred to as coils U1 to U4, V1 to V4, and W1 to W4 depending on the phase of the current flowing through the coil 40. In addition, the conductive wire 41 that constitutes the coil 40 is aligned and wound in multiple layers around the insulator 50 mounted on the tooth 10 (see FIG. 3 ).

The rotor 200 has an output shaft 210 arranged at the shaft center and magnets 220 facing the stator 100 and having N poles and S poles alternately arranged along the outer peripheral direction of the output shaft 210. The material, shape, and material of the magnet 220 can be appropriately changed according to the output of the motor 1000 and the like.

The coils U1 to U4, V1 to V4, and W1 to W4 are connected in series, respectively, and three-phase currents of U, V, and W phases having a phase difference of 120° in electrical angle are respectively generated in the coils U1 to U4. The rotating magnetic field is generated in the stator 100 by being supplied to and excited by V1 to V4 and W1 to W4. This rotating magnetic field interacts with the magnetic field generated by the magnet 220 provided in the rotor 200 to generate torque in the rotor 200, and the output shaft 210 is supported and rotated by a bearing (not shown).

[Insulator configuration]
FIG. 2 shows a schematic diagram of the insulator according to the present embodiment. For convenience of explanation, the shape of the insulator 50 is shown in a simplified form. Further, in FIG. 2, an enlarged view of a portion surrounded by a broken line is also shown. Further, in FIG. 2, the shape of the conducting wire 41 after being wound one layer is shown by a dashed line.

As shown in FIG. 2, the insulator 50 includes a conductive wire winding portion 52 around which the conductive wire 41 is wound, and a first flange portion provided at a radially outer end of the conductive wire winding portion 52 and having a conductive wire guide groove 51a. It has 51 and the 2nd collar part 53 provided in the radial inside end of the conducting wire winding part 52.

The conductor wire 41 is guided to the conductor wire winding portion 52 through the conductor wire guide groove 51a. The shape of the wire guide groove 51a is not limited to the shape shown in FIG. 2, and may be, for example, a shape inclined with respect to the radial direction (see FIG. 4). In the latter case, the guide angle δ of the conductive wire 41 (see FIG. 4) can be made smaller, and winding disorder of the conductive wire 41 can be suppressed more easily. The insulator 50 is attached to the tooth 10 so that the first flange portion 51 covers a part of the split yoke 21.

The conductor winding portion 52 has a rectangular tubular shape in a cross-sectional view, and has a first end face 52a continuous with the bottom surface of the conductor guide groove 51a, a first end face 52a, and a second end face 52b axially opposed to each other. ing. Further, the conductive wire winding portion 52 includes a first side surface 52c provided so as to extend in the axial direction from one end side in the circumferential direction of the first end surface 52a to one end side in the circumferential direction of the second end surface 52b, and the first end surface 52a. The second side surface 52d (see FIG. 3) is provided so as to extend in the axial direction from the other end side in the circumferential direction to the other end side in the circumferential direction of the second end face 52b. The first side surface 52c and the second side surface 52d face each other in the circumferential direction.

Also, the conducting wire winding part 52 has four corner parts 52e1 to 52e4. The four corner portions 52e1 to 52e4 are the first corner portion 52e1 located between the first end surface 52a and the first side surface 52c, and the second corner portion located between the first side surface 52c and the second end surface 52b. 52e2, a third corner portion 52e3 located between the second end surface 52b and the second side surface 52d, and a fourth corner portion 52e4 located between the second side surface 52d and the first end surface 52a.

Also, a plurality of protrusions 60 are provided on each of the four corner portions 52e1 to 52e4. The protrusion 60 is provided so as to extend from each of the corner portions 52e1 to 52e4 so as to cover the adjacent surface. For example, the projection 60 provided on the first corner portion 52e1 is provided so as to cover the first end surface 52a and the first side surface 52c, respectively, and the projection 60 provided on the third corner portion 52e3 includes the second end surface 52b and the second end surface 52b. The second side surfaces 52d are provided so as to overlap with each other. The plurality of protrusions 60 provided on each of the corner portions 52e1 to 52e4 are provided at intervals Z in the radial direction.

The projection 60 has a first surface 60a that faces the first flange portion 51 and a second surface 60b that faces the second flange portion 53, whereas the first surface 60a is a flat plane. The second surface 60b is a curved surface that is convex inward in the radial direction.

[Structure of essential parts of stator]
3A and 3B are schematic views of a main part of the stator according to the present embodiment. FIG. 3A is a perspective view seen from the upper side in the axial direction, and FIG. 3B is a perspective view seen from the lower side in the axial direction. Are shown respectively. FIG. 4 is a schematic view of a main part of the stator as seen from the upper side in the axial direction, and FIG. 5 is a sectional view taken along line VV of FIG.

For convenience of explanation, in FIG. 3, the conductive wire 41 is wound around the conductive wire winding portion 52 to the middle of the third layer, and in FIG. 4, the conductive wire 41 is wound around the conductive wire winding portion 52 in the middle of the first layer. The state of being wound up is shown respectively. Further, for convenience of description, in FIG. 4, the conductor wire guide groove 51a has a shape inclined at a guide angle δ with respect to a direction orthogonal to the radial direction when viewed in the axial direction.

Further, in FIG. 5, the projection 60 is omitted. The cross-sectional shape including the protrusion 60 is shown in FIG. 10B described later. The arrows shown in FIG. 5 indicate the winding order in each layer of the conductive wire 41. For example, the first-layer conductive wire 411 is wound from the first flange portion 51 toward the second flange portion 53, and the second-layer wiring 412 is wound from the second flange portion 53 toward the first flange portion 51. It is wound.

In the following description, when the conductive wire 41 is wound around the conductive wire winding portion 52 in n layers (n is an integer of 2 or more), the (i-1)th layer (i is an integer of 2 or more, and i The portion where the conductor wire 41 of ≦n) is rewound from the conductor wire 41 of the i-th layer may be referred to as a cross portion 4i (cross

portions

42, 43,..., 4i). Further, in the present embodiment, the conductive wire 41 is wound so that the cross portion 4i is located on the first end surface 52a. In addition, the conductor wire 41 is aligned and wound around the conductor wire winding portion 52 of the insulator 50.

As shown in FIG. 3A and FIG. 4, the first-layer conductor wire 411 guided from the conductor wire guide groove 51a to the first end surface 52a has a predetermined cross angle ε with respect to the direction orthogonal to the radial direction. It is wound around the first end face 52a so as to form (see FIG. 4). The second-layer conductive wire 412 rewound from the first-layer conductive wire 411 at the radially inner end of the conductive-wire winding portion 52 is wound around the first end surface 52a at an angle different from the cross angle ε. Furthermore, the conductor wire 413 of the third layer, which is rewound from the conductor wire 412 of the second layer at the radially outer end of the conductor wire winding portion 52, is wound around the first end face 52a at an angle substantially equal to the cross angle ε. ..

On the other hand, as shown in FIG. 3B, on the second end face 52b, the first side face 52c, and the second side face 52d, all the lead wires 411 to 413 of the first to third layers are connected to the first flange portion 51. Is wound around the conductor winding portion 52 so as to be parallel to the end surface located on the radially inner side (hereinafter referred to as the inner surface 51b of the first flange portion 51).

The conductor wire 411 of the first layer is positioned by the plurality of protrusions 60 provided on the corner portions 52e1 to 52e4 and is held on the surface of the conductor wire winding portion 52 (see FIGS. 10A and 10B). Further, the first-layer conductive wire 411 is formed on the surface of the conductive wire winding portion 52, that is, the first end surface 52a, the second end surface 52b, the first side surface 52c, and the first side surface 52c so as to form a predetermined angle θ with respect to the radial direction. It is wound so as to be inclined with respect to each of the two side surfaces 52d.

On the other hand, as shown in FIG. 5, the conductor wire 41 of the second and subsequent layers is aligned and wound by being supported by the end face 41b of the conductor wire 41 of the layer immediately below. Similarly to the conductor wire 411 of the first layer, the conductor wires 41 of the second and subsequent layers are also inclined to form a predetermined angle θ with respect to the radial direction and are wound around the conductor wire 41 of the layer immediately below. In FIG. 5, the surface of the conductive wire 41 forming an angle θ with the radial direction is referred to as a flat surface 41a, and the surface of the conductive wire 41 orthogonal to the flat surface 41a is referred to as an end surface 41b, which will also be referred to in the following description.

As shown in FIGS. 3 to 5, in order to arrange the conductor wire 41 around the conductor wire winding portion 52 in an aligned and multi-layered manner, it is necessary to prevent winding disorder particularly in the first-layer conductor wire 411.

I will explain this further. The first-layer conductor wire 411 guided from the conductor wire guide groove 51a to the first end surface 52a is wound so as to be pressed against the inner surface 51b of the first flange portion 51. Therefore, as shown in FIG. 4, a curved portion that bulges radially inward is formed in the first-layer conductor wire 411 at the end portion of the conductor wire guide groove 51a.

When the radius of curvature R of the curved portion is R, and when the radius of curvature R becomes smaller, the amount of deformation of the first-layer conductor wire 411 at the end portion of the conductor guide groove 51a, that is, the amount of bulging inward in the radial direction increases, Winding is likely to occur. Therefore, it is necessary to make the radius of curvature R as large as possible.

Therefore, the radius of curvature R can be increased by setting the winding angle of the conductor wire 411 of the first layer so that the guide angle δ and the cross angle ε shown in FIG. 4 satisfy the relationship of the following expression (1). It is possible to suppress winding disorder of the conductive wire 41, especially the conductive wire 411 of the first layer.

Ε≦δ (1)

FIG. 6 is a schematic diagram illustrating the relationship between the inclination angle of the conductor wire with respect to the radial direction and the distance between the conductor wires adjacent to each other in the radial direction. FIG. 6A shows the theoretical limit when the conductor wires adjacent to each other in the radial direction overlap each other. Drawings (b) and (c) show the case where the end faces of the conductors adjacent in the radial direction partially overlap each other. In addition, in the figure (c), the corner portion of the conductive wire 41 has an arc-shaped cross section having a predetermined radius.

Also, FIG. 7 shows a schematic diagram for explaining the relationship between the receding angle of the slot and the inclination angle of the conductor wire with respect to the radial direction. For convenience of description, the insulator 50 is not shown in FIGS. Further, in FIG. 7, an enlarged view of a portion surrounded by a broken line is also shown.

When the conductor wires 41 wound around the insulator 50 are in contact with each other in the radial direction, the maximum value θmax of the inclination angle θ of the conductor wire 41 with respect to the radial direction is represented by the formula (2), as shown in FIG. 6A. .. 6A to 6C show the first-layer conductive wire 411.

θmax=tan ⁻¹ (Y/X) (2)

Here, X is the long side of the conducting wire 411 in the cross sectional view, Y is the short side of the conducting wire 411 in the cross sectional view, X corresponds to one side of the flat surface 41a, and Y corresponds to one side of the end surface 41b.

Also, at this time, the maximum value Zmax of the pitch Z between the conductor wires 411 that are adjacent in the radial direction is expressed by the following equation (3). The pitch Z corresponds to the interval Z between the protrusions 60 shown in FIG.

Zmax=X/cos(θmax) (3)

On the other hand, as shown in FIGS. 6B and 6C, when the conducting wires 411 are in contact with each other such that their short sides overlap each other with a predetermined length, the above inclination angle θ is calculated by the following equation (4). ) And the pitch Z is expressed by the equation (5).

θ=θmax×α=tan ⁻¹ (Y/X) (100−α) (4)
Z=Zmax×β=(X/cos θ)×(β/100) (5)

Here, the variable α is the degree of overlap (%) between the short sides of the conductor 41, and the variable β is the margin (%) of the pitch Z. The variables α and β can be appropriately changed depending on the cross-sectional shape of the conductive wire 41, the material and state of the surface insulating film (not shown) of the conductive wire 41, and the like. Further, the variables α and β can change within the ranges represented by the expressions (6) and (7), respectively.

0<α(%)<100 (6)
β (%)>100 (7)

When the conductors 41 are in contact with each other such that their short sides overlap each other, the variable α is about 20% or more in order to stably hold the conductors 41 on the conductor winding portion 52. preferable. Similarly, the variable β is preferably about 103%.

Although FIG. 6 shows the case where the first-layer conductive wire 411 is in contact with each other in the radial direction, the relationships shown in the formulas (2) to (7) are otherwise applicable to, for example, the first-layer conductive wire 411. When the conductor wire 412 of the second layer is in radial contact with each other so that the short sides thereof partially overlap each other, or the conductor wire 412 of the second layer and the conductor wire 413 of the third layer have mutually short sides. Naturally, it is also true when they are in radial contact with each other so that they overlap.

Further, what is indicated by a chain line in FIG. 7 is the arrangement of the conductor wire 41 wound by the conventional winding procedure, and the conductor wire 41 is wound around the conductor wire winding portion 52 without the inclination angle θ. It corresponds to the case. In this case, there is a possibility that the volume of the non-effective space in which the conducting wire 41 is not arranged is increased in the uppermost layer of the coil 40, or the conducting wire 41 protrudes from the slot 30.

On the other hand, as shown in FIG. 7, the volume of the above-mentioned ineffective space can be reduced by winding the conducting wire with the above inclination angle θ in the radial direction. Further, the inclination angle θ is preferably equal to or smaller than the receding angle θcore of the slot 30. Here, θ core is provided at the radially inner end of the tooth 10 and is a virtual plane that passes through the side surface of the projecting portion 10 a that projects in the circumferential direction and the side surface of the split yoke 21, and the first winding portion 52. It corresponds to an angle formed by the side surface 52c or the second side surface 52d. For example, if the inclination angle θ is smaller than the receding angle θcore with reference to the second side surface 52d, the uppermost conductor wire 41 of the conductor wires 41 wound in multiple layers around the insulator 50 does not protrude in the circumferential direction and the corresponding slot 30 does not protrude. Since it is housed inside, the space factor of the coil 40 can be kept high. However, in consideration of the cross angle ε, the interval Z between the protrusions 60, etc., the inclination angle θ may be equal to or smaller than the receding angle θcore.

[Method of winding conductors]
FIG. 8 shows the configuration of the winding equipment for the conductive wire, and FIG. 9 shows a process explanatory view of the process in which the conductive wire is wound around the insulator. Note that, for convenience of description, in FIG. 8, only a main part of the winding equipment is illustrated in a simplified manner. Further, the projection 60 provided on the insulator 50 is not shown. Further, in FIG. 9, the winding equipment is not shown.

As shown in FIG. 8, the conductor wire 41 shown in this embodiment can be wound around the insulator 50 by a normal work rotation method. That is, the tooth 10 to which the insulator 50 is attached is set on the holding table 2100, the conductor 41 is guided to the conductor winding portion 52 from the conductor guide groove 51a, and the tip of the conductor 41 is gripped by the nozzle 2200. The holding table 2100 has a rotation shaft (not shown), and the rotation shaft and the radial center line of the insulator 50 are made to coincide with each other.

In this state, the conductor 41 is wound around the insulator 50 by rotating the holder 2100 around its rotation axis and moving the nozzle 2200 relative to the holder 2100. The nozzle 2200 moves the tip of the conductive wire 41 such that the conductive wire 411 of the first layer is held by the protrusion 60 and wound around the first end surface 52a at the cross angle ε. Further, at the second end face 52b and the first and second side faces 52c, 52d, the tip of the conductor wire 41 is moved so that the conductor wire 411 of the first layer is parallel to the inner surface 51b of the first flange 51. Further, after the second-layer conductive wire 412, the nozzle 2200 moves the tip of the conductive wire 41 so as to have the winding shape shown in FIG. 9.

By thus winding the conductor wire 41 around the insulator 50, the first-layer conductor wire 411 is aligned and wound around the conductor wire winding portion 52 as shown in FIG. 9A. Next, at the cross portion 42, the first-layer conductive wire 411 is rewound from the second-layer conductive wire 412, and the second-layer conductive wire 412 is arranged so as to be substantially symmetrical to the first-layer conductive wire 411 in the radial direction. It is wound around the one end face 52a ((b) of FIG. 9). Furthermore, the conductor wire 412 of the second layer is wound to the radially outer end of the conductor wire winding portion 52 (FIG. 9C), and is rewound to the conductor wire 413 of the third layer at the cross portion 43 (FIG. (Fig. 9 (d)). The conductor wire 413 of the third layer is wound around the first end surface 52a at an angle substantially equal to the cross angle ε.

Although not shown, in FIG. 9C, the first-layer conductor wire 411 is supported by a plurality of protrusions 60 provided at the corner portions 52e1 to 52e4 of the conductor wire winding portion 52, It is wound so as to be inclined with respect to the surface of the conductive wire winding portion 52 so as to form an inclination angle θ with respect to. The second-layer conductor wire 412 is supported by the end surface 41b of the first-layer conductor wire 411 and is wound around the first-layer conductor wire 411 so as to form an inclination angle θ with respect to the radial direction. Similarly, the conductor wire 413 of the third layer is supported by the end surface 41b of the conductor wire 412 of the second layer and wound around the conductor wire 412 of the second layer so as to form an inclination angle θ with respect to the radial direction. ..

Note that, in the present embodiment, the winding method using a nozzle is described as an example, but a winding method using a roller, a hook, a cam or the like that guides the conducting wire 41 may be used instead of the nozzle. Further, as described above, the work rotation method is suitable for winding the conductor wire 41 having a non-circular cross-sectional shape, but if the trouble such as the conductor wire 41 being twisted and deformed can be eliminated, the conductor wire 41 is fixed by the work fixing method. It may be wrapped.

[Effects, etc.]
As described above, the stator 100 according to the present embodiment is provided with the annular yoke 20 and the yoke 20 at a predetermined interval in the circumferential direction and from the inner circumference of the yoke 20 in the radial direction of the yoke 20. A plurality of teeth 10, a plurality of insulators 50 attached to each of the plurality of teeth 10, a conductor 41 having a rectangular cross section, and a plurality of coils 40 wound around each of the plurality of insulators 50. And are equipped with.

The insulator 50 is provided at a cylindrical wire winding portion 52 around which the wire 41 is wound, and a radially outer end portion of the wire winding portion 52, and a wire guide groove for guiding the wire 41 to the wire winding portion 52. It has the 1st collar part 51 which has 51a, and the 2nd collar part 53 provided in the radial inside end of the conducting wire winding part 52.

The conductive wire winding portion 52 includes a first end surface 52a continuous to the bottom surface of the conductive wire guide groove 51a, a second end surface 52b opposed to each other in the axial direction of the stator 100, and a circumferential edge of the first end surface 52a. To a second side face 52b, the first side face 52c and the second side face 52d are provided to face each other in the circumferential direction and face each other in the circumferential direction. Further, the conductor winding portion 52 is provided at the corner portions 52e1 to 52e4, and is for winding the conductor 41 around the first end surface 52a so as to form a predetermined cross angle ε with respect to the direction orthogonal to the radial direction. It has a plurality of protrusions 60.

The plurality of protrusions 60 are provided at intervals Z in the radial direction and have a first surface 60a facing the first flange portion 51 and a second surface 60b facing the second flange portion 53. The first surface 60a is a flat plane, while the second surface 60b is a curved surface that is convex inward in the radial direction.

By configuring the stator 100 in this manner, it is possible to stably wind the conductor wire 41 having a rectangular cross section, that is, a rectangular wire around the insulator 50 in an aligned and multi-layered manner. This will be further described with reference to the drawings.

FIG. 10A is a schematic diagram showing the arrangement of conductors on a conductor winding portion when no protrusion is provided, and FIG. 10B is a schematic diagram showing the arrangement of conductors on a conductor winding portion when protrusions are provided. is there. 10A and 10B, an enlarged view of a portion surrounded by a broken line is also shown. Further, in FIGS. 10A and 10B, only the first-layer conductive wire 411 among the conductive wires 41 is shown. The alternate long and short dash line indicates the actual position of the conductive wire 41, and the dotted line indicates the position at which the conductive wire 41 should originally be wound.

As shown in FIG. 10A, in the process in which the first-layer conductor wire 411 guided from the conductor wire guide groove 51a is wound around the conductor wire winding portion 52, the first-layer conductor wire 411 is a first layer adjacent to the first layer in the radial direction. A force directed inward in the radial direction is received from the conducting wire 411. When the conductor wire winding portion 52 is not provided with the protrusions 60, there is no mechanism for supporting the conductor wire 411 of the first layer in the radial direction, and thus the conductor wire 411 of the first layer is displaced from its original position to the conductor wire winding portion 52. It is wound. Therefore, winding disorder occurs, and the first-layer conductive wire 411 is not aligned and wound around the conductive wire winding portion 52. Further, when winding disorder occurs in the first-layer conductive wire 411, the second-layer and subsequent conductive wires 41 sequentially wound on the first-layer conductive wire 411 are not aligned and wound, and as a result, the space factor of the coil 40 decreases. Will end up.

On the other hand, as shown in FIG. 10B, according to the present embodiment, the plurality of protrusions 60 are provided on each of the corner portions 52e1 to 52e4 of the conductor winding portion 52 to support the conductor wire 411 of the first layer in the radial direction. it can. Further, since the plurality of protrusions 60 are provided at intervals Z in the radial direction, the conductor wire 411 of the first layer is held on the surface of the conductor wire winding portion 52 in a state of being aligned and wound. Further, although not shown in FIG. 10B, the second-layer conductive wire 412 is supported by the end surface 41b of the first-layer conductive wire 411, and thus is aligned and wound on the first-layer conductive wire 411 to form the third-layer conductive wire 412. Similarly, the conducting wire 41 after the eye is similarly wound around the insulator 50 in an aligned manner, and the aligned wound and multilayer wound coil 40 can be stably realized.

Further, as shown in FIG. 10B, the first surface 60a of the projection 60 is a flat plane, whereas the second surface 60b is a curved surface that is convex inward in the radial direction. By configuring the protrusion 60 in this way, the end surface 41b of the first-layer conductive wire 411 is stably held on the first surface 60a. Further, even when the thickness of the conductive wire 41, in this case, the long side X or the short side Y of the first-layer conductive wire 411 in the cross-sectional view varies from the design value and the inclination angle θ changes, the second surface 60b. Is a curved surface, the first-layer conductive wire 411 can be reliably brought into contact with the second surface 60b. As a result, the first-layer conductor wire 411 is held on the surface of the conductor wire winding portion 52 in a state where it is positioned at a predetermined position, and the conductor wire 411 is aligned and wound.

Further, by forming the second surface 60b into a convex curved surface, when the insulator 50 is integrally molded with a mold (not shown), it becomes easy to remove the protrusion 60 from the mold. As a result, a special release agent is used to facilitate the removal of the protrusions 60, or when the protrusions 60 are removed from the mold, the protrusions 60 are chipped and defective insulators 50 are produced. It is possible to suppress an increase in manufacturing cost.

The first-layer conductive wire 411 wound around the conductive wire winding portion 52 is supported by the plurality of protrusions 60, is wound around the first end surface 52a at the cross angle ε, and is inclined with respect to the radial direction. It is wound so as to be inclined on the surface of the conductive wire winding portion 52 so as to form an angle θ.

The conductor wire 41 is wound around the conductor wire winding portion 52 in n layers (n is an integer of 2 or more), and the conductor wire 41 of the i-th layer (i is an integer of 2 or more and i≦n) is the first wire. At the end face 52a, it is rewound from the conducting wire 41 of the (i-1)th layer and wound on the conducting wire 41 of the (i-1)th layer at an angle different from the cross angle ε. The i-th conductor wire 41 is supported on the end surface 41b of the (i-1)-th conductor wire 41 so that the i-th conductor wire 41 forms an inclination angle θ with the (i-1)-th conductor wire. It is wound.

By winding the conductive wire 41 around the conductive wire winding portion 52 in this manner, the end surface 41b of the first-layer conductive wire 411 that is held by the plurality of protrusions 60 and is aligned and wound at an inclination angle θ with the radial direction is supported. As a part, the conductor wire 412 of the second layer is aligned and wound on the conductor wire 411 of the first layer without being disturbed by the cross portion 42. Similarly, the end face 41b of the (i-1)-th layer conductive wire 41 wound in a line is used as a supporting portion, and the i-th layer conductive wire 41 is not disturbed at the cross portion 4i and It is rolled up on top. As described above, it is possible to stably realize the coil 40 that is alignedly wound around the insulator 50 and wound in multiple layers.

The projection 60 provided on the corner portion 52e1 between the first end surface 52a and the first side surface 52c and the projection 60 provided on the corner portion 52e2 between the first side surface 52c and the second end surface 52b are provided respectively. The second surfaces 60b, which are convex curved surfaces, face the same direction as each other, in this case, the radially inner side.

By doing so, the position of the cross portion 4i can be reliably determined on the first end surface 52a.

The motor 1000 according to the present embodiment includes at least a stator 100 and a rotor 200 provided at a predetermined distance from the stator 100, and the conductive wire 41 is wound around the insulator 50 in a line and in multiple layers.

According to the present embodiment, the conductor wire 41 is aligned and wound in multiple layers around the insulator 50 by the plurality of protrusions 60 provided on the conductor wire winding portion 50. As a result, the space factor of the coil 40 in the slot 30 can be increased, and the highly efficient motor 1000 can be realized.

In the present embodiment, the protrusion 60 is provided so as to extend from each of the corner portions 52e1 to 52e4 so as to cover the adjacent surface, but the present invention is not limited to this, and the protrusion 60 may be, for example, as shown in FIG. May be provided only in each of the corner portions 52e1 to 52e4. Also in this case, the first-layer conductive wire 411 is wound while being inclined at the cross angle ε with respect to the first end surface 52a, and is supported by the first surface 60a of the protrusion 60 to be the surface of the conductive wire winding portion 52. It is lined up and wound.

<Modification>
12 to 15 are schematic diagrams of the first to fourth insulators according to this modification. In each drawing, (a) is a perspective view seen from the upper side in the axial direction, and (b) is a perspective view seen from the lower side in the axial direction. 12 to 15, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the configuration shown in the first embodiment, the projection 60 is provided on each of the corner portions 52e1 to 52e4, whereas in the configuration shown in the present modification, the other portions, for example, the first side surface 52c and the second side surface 52d. Etc. are different in that the protrusions 61 are also provided.

For example, as shown in FIG. 12, on the first side surface 52c and the second side surface 52d, a plurality of protrusions 61 are arranged at intervals Z in the radial direction and parallel to the inner surface 51b of the first flange portion 51. May be provided. Specifically, the plurality of protrusions 61 may be provided on the first side surface 52c so as to extend linearly from the corner portion 52e1 to the corner portion 52e2. Further, a plurality of protrusions 61 may be provided on the second side surface 52d so as to extend linearly from the corner portion 52e3 to the corner portion 52e4.

Further, as shown in FIG. 13, in addition to the configuration shown in FIG. 12, a plurality of protrusions 62 are radially spaced apart from each other on the second end surface 52b and are spaced apart from each other by the inner surface 51b of the first flange portion 51. It may be provided so as to be parallel. Specifically, a plurality of protrusions 62 may be provided on the second end surface 52b so as to extend linearly from the corner portion 52e2 to the corner portion 52e3. In the configuration shown in FIG. 13, the protrusion 62 is provided so as to continuously extend from the corner portion 52e1 to the corner portion 52e3.

Further, as shown in FIG. 14, in addition to the configuration shown in FIG. 13, a plurality of protrusions 63 may be provided on the first end surface 52a at intervals Z in the radial direction. Specifically, the protrusion 63 may be provided on the first end surface 52b so as to extend linearly from the corner portion 52e4 to the corner portion 52e1. In addition, in the configuration shown in FIG. 14, the plurality of protrusions 63 provided on the first end surface 52a are inclined at a cross angle ε with respect to the direction orthogonal to the radial direction and are spaced apart from each other by a distance Z in the radial direction. Are provided respectively.

By applying the insulator 50 shown in FIGS. 12 to 14 to the stator 100, the same effect as that of the first embodiment can be obtained. In addition, by providing a plurality of continuously extending projections 61 to 63 on the surface of the conductive wire winding portion 52 other than the corner portions 52e1 to 52e4, the winding position of the conductive wire 41 can be reliably determined and the conductive wire 41 can be stabilized. It can be rolled into a line.

Instead of the configuration shown in FIG. 14, as shown in FIG. 15, the protrusions 64 provided on the first and second end faces 52a, 52b and the first and second side faces 52c, 52d are respectively extended in the extending direction. You may comprise so that it may become discontinuous.

That is, the plurality of protrusions 64 are provided on the first side surface 52c and the second side surface 52d at intervals in the radial direction and the axial direction, respectively. A plurality of protrusions 64 are provided on the second end surface 52b at intervals in the radial direction and the circumferential direction. A plurality of protrusions 64 are provided on the first end surface 52a at intervals in the radial direction and the circumferential direction, respectively. The interval between the protrusions 64 provided on each of the surfaces 52a to 52d in the radial direction is the above-mentioned interval Z.

Also when the insulator 50 shown in FIG. 15 is applied to the stator 100, the same effect as that of the first embodiment can be obtained. Although not shown, the shape of the protrusion 64 shown in FIG. 15 may be applied to the configurations shown in FIGS. 12 and 13.

(Embodiment 2)
FIG. 16 shows a schematic diagram of the insulator according to the present embodiment, and FIG. 17 shows a schematic diagram of a main part of the stator as seen from the axial upper side. Note that, in FIG. 16, an enlarged view of a portion surrounded by a broken line is also shown. Further, in FIG. 16, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. Further, in FIG. 17, only the first-layer conductive wire 411 among the conductive wires 41 is shown.

In the configuration shown in the first embodiment, the protrusion 60 provided on the corner 52e1 between the first end face 52a and the first side face 52c and the protrusion 60 provided on the corner 52e2 between the first side face 52c and the second end face 52b. Means that the second surfaces 60b provided on each of them face inward in the radial direction.

On the other hand, in the configuration of the present embodiment shown in FIG. 16, the protrusion 60 provided at the corner portion 52e1 between the first end face 52a and the first side face 52c has the second face 60b facing inward in the radial direction. The second surface 60b of the projection 60 provided on the corner portion 52e2 between the first side surface 52c and the second end surface 52b is oriented radially outward. That is, in the former projection 60 and the latter projection 60, the second surfaces 60b provided on the projections 60 face in opposite directions.

Depending on the design specifications of the motor 1000, it is also required to provide the cross portion 4i on a surface different from the first end surface 52a of the wire winding portion 52. However, in the configuration shown in the first embodiment, it is difficult to provide the cross portion 4i on a portion other than the first end surface 52a.

On the other hand, according to this embodiment, the cross portion 4i can be provided not only on the first end surface 52a but also on the second end surface 52b. That is, the conductive wire 41 is also rewound from the j-th layer (j is an integer, 1≦j≦n−1) to the (j+1)-th layer on the second end face 52b, and the cross portion 4i is also on the second end face 52b. It is provided. As a result, the degree of freedom in designing the stator 100 and thus the motor 1000 can be improved. In this case, for example, as shown in FIG. 17, the first-layer conductive wire 411 may be wound on the second end surface 52b so as to form a cross angle ε with respect to the direction orthogonal to the radial direction. ..

(Embodiment 3)
FIG. 18A is a schematic sectional view of a main part of a stator according to the present embodiment, and FIG. 18B is a schematic sectional view of a main part of a stator for comparison. 18A and 18B, the protrusion 60 is not shown for convenience of description. Further, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the configuration of the present embodiment shown in FIG. 18A, the k-th winding of the first-layer conductive wire 411 (k is the number of windings of the first-layer conductive wire 411) is arranged at the radially inner end of the conductive-wire winding portion 52. The difference from the configuration of the first embodiment shown in FIG. 18B is that a step 52f having a predetermined height is provided in a portion to be cut. The step 52f is provided continuously to the surface of the conductive wire winding portion 52, that is, on both the first and second end surfaces 52a and 52b and the first and second side surfaces 52c and 5d. Further, the conductor wire 411 of the first layer is not wound around the step 52f.

According to the present embodiment, it is possible to suppress the generation of energy loss in the motor 1000 due to the eddy current flowing in the conductor 41 due to the magnetic flux passing through the inside of the coil 40. This will be further described.

As shown in FIG. 18B, when a current flows through the conductive wire 41, a magnetic flux is generated so as to pass through the inside of the coil 40, that is, the inside of the split yoke 21 and the tooth 10, and the magnetic flux is generated at the radially inner end portion of the tooth 10. May partially leak to the conductor 41. This leakage magnetic flux causes an eddy current in the conducting wire 41 near the tooth 10, for example, the conducting wire 411 of the first layer, which causes energy loss.

On the other hand, according to the present embodiment, as shown in FIG. 18A, the conductor 41 through which the leakage magnetic flux passes, that is, the portion corresponding to the k-th winding located on the radially inner side of the conductor 411 of the first layer is predetermined. By providing the height difference 52f, the conductor wire 411 of the first layer is prevented from being wound around the portion. As a result, it is possible to prevent the leakage magnetic flux from passing through the conductive wire 41, and suppress the generation of eddy current and eventually the energy loss of the motor 1000.

The step 52f may be provided across the (k−1)th turn and the kth turn of the first-layer conductor wire 411. Further, the step 52f may be provided so as to extend to a portion where the first winding of the second layer conductive wire 412 is to be wound. The height and the radial length of the step 52f can be appropriately changed depending on the balance between the reduction degree of the eddy current flowing through the conductor 41 and the reduction of the space factor of the coil 40.

Since the influence of the leakage magnetic flux on the side close to the split yoke 21 is small, in order to suppress the generation of the eddy current, the conductor wire winding portion 52 is arranged so that the conductor wire 41 contacts the inner surface 51b of the first collar portion 51. It is preferable to abut.

(Embodiment 4)
FIG. 19A shows a schematic sectional view of a main part of a stator according to the present embodiment, and FIG. 19B shows a schematic sectional view of a main part of a stator for comparison. Note that, for convenience of description, the projection 60 is omitted in FIGS. 19A and 19B. Further, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the configuration illustrated in FIG. 19B, among the insulators 50 adjacent to each other in the circumferential direction, the conductor wire 41 wound around one insulator 50 and the conductor wire 41 wound around the other insulator 50 have symmetrical shapes. Each is wound so that.

On the other hand, in the configuration of the present embodiment shown in FIG. 19A, among the insulators 50 adjacent to each other in the circumferential direction, the conductor wire 41 wound around one insulator 50 and the conductor wire 41 wound around the other insulator 50. , Each is wound so that its shape is asymmetric.

The space factor of the coil 40 can be increased by forming each conductive wire 41 into the winding shape shown in FIG. 19A. This will be further described.

Usually, when winding the conductor wire 41 around each of the plurality of insulators 50, in order to standardize the winding process and to simplify the assembly process of the stator 100, the coils 40 adjacent to each other in the circumferential direction face each other. The conductive wire 41 is wound so that the planes are symmetrical.

In the set of coils 40 wound in this way, the coils 40 adjacent to each other in the circumferential direction and the coils 40 are mounted in the circumferential direction in order to suppress interference between the coils 40 and to secure an insulation distance between them. It is necessary to arrange the teeth 10 to be spaced apart by a predetermined value or more.

However, depending on the size of the coil 40 and the number of windings of the conductive wire 41, the gap may become too large and the non-effective space not occupied by the conductive wire 41 in the slot 30 may increase.

On the other hand, according to the present embodiment, the insulating shape of the coils 40 adjacent to each other in the circumferential direction is ensured by making the winding shapes of the conductor wires 41 wound around the insulators 50 adjacent to each other in the circumferential direction asymmetric. At the same time, the non-effective space can be reduced and the space factor of the coil 40 can be increased.

In the conductor wires 41 respectively wound around the insulators 50 adjacent to each other in the circumferential direction, the 1st turn of each conductor wire 41 (l is an integer, 1≦l≦k; k is the number of turns of the first-layer conductor wire). By making the winding shape a) asymmetric, the degree of reduction of the non-effective space can be further increased and the degree of freedom in designing the coil 40 can be improved. For example, as shown in FIG. 18A, while the third and fourth windings of the conducting wire 41 located on the left side of the paper surface are 7 layers, respectively, the conducting wire 41 located on the right side of the paper surface has the third winding of 6 layers. By making the fourth turn 5 layers, the degree of reduction of the ineffective space is increased and the insulation distance between the two coils 40 is secured. However, the winding shape of the conductive wire 41 is not particularly limited to this, and may be appropriately changed depending on the size of the coil 40, the number of layers of the conductive wire 41, the number of windings, and the like.

(Other embodiments)
In the first to fourth embodiments, in the conductive wire 41 wound around the insulator 50, between the l-th winding and the (l+1)-th winding, or between the (i-1)-th layer and the i-th layer, that is, in the circumferential direction and As shown in FIG. 20, a heat radiating material 70 for radiating the heat generated in the conductive wire 41 to the outside may be filled between the conductive wires 41 adjacent to each other in the radial direction.

By configuring the stator 100 in this way, the temperature rise of the stator 100 can be suppressed and the efficiency of the motor 1000 can be improved.

In the first embodiment, the work rotating method is used to wind the conductor wire 41 around the insulator 50, but the winding method of the coil 7 is not particularly limited.

For example, the holding base 2100 may be fixed, and the conductor 41 may be wound around the insulator 50 by a so-called conducting wire rotation method in which the nozzle 2200 moves around the holding base 2100. In this case, the yoke 20 does not have to have a configuration in which the split yokes 21 are connected in the circumferential direction. May be. Alternatively, the plurality of teeth 10 may be connected to the inner circumference of the yoke 20 after the yoke 20 is formed in an annular shape.

Also, the insulator 50 may be a so-called split type insulator that is mounted from above and below in the axial direction of the tooth 10, or may be an integral structure that covers the entire outer peripheral surface of the tooth 10.

Further, in the stator 100 according to the first to fourth embodiments, the coil 40 may be composed of the conductor wire 41 wound in one layer. Also in this case, the conductor wire 41 is wound in a line around each of the plurality of insulators 50.

The cross-sectional shape of the conductor wire 41 may be a quadrangle as shown in FIGS. 6(a) and 6(b), or a quadrangle with chamfered four corners as shown in FIG. 6(c). Further, the cross-sectional shape of the conductive wire 41 is not particularly limited to the shape shown in FIG. 6, and for example, the side X may be longer than the side Y.

Also, the tooth 10 may have different cross-sectional shapes at the axial end and the axial center. For example, the cross-sectional shape of the tooth 10 is continuously or stepwise changed so that the width in the direction orthogonal to the radial direction is narrower at the both ends of the axial end, or at the upper end or the lower end, than at the center. May be. The inner peripheral surface of the conductive wire winding portion 52 of the insulator 50 may be deformed in accordance with the change in the cross-sectional shape of the tooth 10.

Since the stator of the present invention can increase the space factor of the coil, it is particularly useful when applied to a motor that requires high efficiency.

10 Teeth (Tooth)
20 yoke 21 split yoke 30 slot 40 coil 41 conductor wire 4i cross portion 50 insulator 51 first flange portion 51a conductor wire guide groove 51b inner surface of the first flange portion 52 conductor wire winding portion 52a first end surface 52b second end surface 52c first side surface 52d Second side surfaces 52e1 to 52e4 Corner portion 52f First end surface 53 Second flange portion 60 to 64 Protrusion

60a First surface

60b Second surface 70 Heat dissipating material 100 Stator 110 Stator core 200 Rotor 210 Output shaft 220 Magnet 411 First-layer conducting wire 412 2nd layer conductor 413 3rd layer conductor 1000 Motor

Claims

An annular yoke, a plurality of teeth that are arranged at a predetermined interval in the circumferential direction of the yoke, and extend in the radial direction of the yoke from the inner circumference of the yoke, and are attached to each of the plurality of teeth. A stator comprising a plurality of insulators, a plurality of coils each having a rectangular cross-section and being wound around each of the plurality of insulators,
The insulator is
A tubular conductor winding portion around which the conductor wire is wound,
A first flange portion provided at one end of the conductor winding portion and having a conductor guide groove for guiding the conductor wire to the conductor winding portion;
A second flange portion provided on the other end of the conductive wire winding portion,
The conductive wire winding portion,
A first end surface that is continuous with the bottom surface of the wire guide groove, and a second end surface that opposes the first end surface and the stator in the axial direction of the stator;
A first side surface and a second side surface that are provided from a circumferential edge of the first end surface to a circumferential edge of the second end surface and that face each other in the circumferential direction;
A plurality of protrusions which are provided at least at a corner portion of the conductor winding portion and which wind the conductor wire around the first end face so as to form a predetermined angle with respect to a direction orthogonal to the radial direction. Then
The plurality of protrusions are provided at a predetermined interval from each other in the radial direction,
The protrusion has a first surface facing the first collar portion and a second surface facing the second collar portion,
At least one of the first surface and the second surface has a convex curved surface.
The stator according to claim 1,
The protrusion provided at a corner portion between the first end surface and the first side surface and the protrusion provided at a corner portion between the first side surface and the second end surface are the protrusions provided respectively. A stator characterized in that the curved surfaces are in the same direction as each other.
The stator according to claim 1,
The protrusion provided at a corner portion between the first end surface and the first side surface and the protrusion provided at a corner portion between the first side surface and the second end surface are the protrusions provided respectively. A stator characterized in that the curved surfaces are oriented in mutually opposite directions.
The stator according to any one of claims 1 to 3,
The first-layer conductor wire wound around the conductor wire winding portion is supported by the plurality of protrusions and is thereby wound around at least the first end surface at the predetermined angle and at the same time as the radial direction. The stator is wound so as to be inclined on the surface of the conductive wire winding portion so as to form an inclination angle of.
The stator according to claim 4,
The conductive wire is wound around the conductive wire in n layers (n is an integer of 2 or more),
The conductor wire of the i-th layer (i is an integer of 2 or more, and i≦n) is rewound from the conductor wire of the (i-1)th layer on the first end face, and is the conductor wire of the (i-1)th layer. Is wound at an angle different from the above predetermined angle,
The conductor wire of the i-th layer is supported by an end surface of the conductor wire of the (i-1)-th layer so as to form the predetermined inclination angle with the radial direction. A stator characterized by being wound on.
The stator according to claim 5,
The stator is characterized in that the conductive wire is rewound from the j-th layer (j is an integer, 1≤j≤n-1) to the (j+1)-th layer on the second end face.
The stator according to any one of claims 4 to 6,
At the radially inner end of the conductive wire winding portion, at least a k-th winding of the first-layer conductive wire (k is the number of windings of the first-layer conductive wire) is to be arranged at a predetermined height. There is a step,
At least the conductor wire of the first layer is not wound around the step.
The stator according to any one of claims 1 to 7,
A stator characterized in that a conducting wire wound around one insulator and a conducting wire wound around another insulator adjacent to the one insulator in the circumferential direction have asymmetric winding shapes.
The stator according to claim 8,
The conductor wire wound around the one insulator and the conductor wire wound around the other insulator are the 1st turns (l is an integer, 1≦l≦k; k is the lead wire of the first layer). A stator characterized in that the winding shape is asymmetric with respect to the number of windings.
The stator according to any one of claims 1 to 9,
A heat radiating material for radiating the heat generated in the conductors to the outside is filled between the conductors that are wound around one insulator and are adjacent to each other in the circumferential direction or the radial direction. Stator.
The stator according to any one of claims 1 to 10,
The yoke is configured by connecting a plurality of split yokes to each other in the circumferential direction,
The stator is characterized in that the teeth are arranged on each of the plurality of split yokes.
A stator according to any one of claims 1 to 11,
At least a rotor provided at a predetermined interval from the stator,
The motor is characterized in that the conductor wire is wound around the insulator in a line and in multiple layers.