JP6305203B2 - Stator for rotating electrical machine and method for manufacturing stator - Google Patents

Description

  The present invention relates to a stator for a rotating electrical machine having distributed coils, a stator core, and a method for manufacturing the stator.

  2. Description of the Related Art Conventionally, in a stator of an inner rotor type rotating electrical machine in which an armature is disposed on the outer peripheral side of a field, a stator core that is divided into an annular yoke portion and an integrally formed tooth group is known ( For example, see Patent Document 1). In the stator manufacturing method described in Patent Document 1, after the stator is wound around a group of teeth in which a plurality of slots are provided between the teeth and the inner peripheral side ends are coupled in the circumferential direction, Is manufactured by a process of fitting the ring yoke portion into the annular yoke portion from the axial direction.

JP-A-7-163076

  In a stator core of a rotating electric machine such as Patent Document 1, when a distributed winding type coil is inserted into a slot from the outer peripheral side of a group of teeth, one coil is inserted as the teeth are inserted in the radial direction of each tooth. Since the circumferential interval between the two slots to be inserted becomes narrow, insertion is performed while reducing the interval between the slot accommodating portions of the coils provided across the plurality of teeth. As a result, the coil end portion is deformed and raised in a mountain shape in the axial direction. Also, at this time, the friction between the coil and the stator core (tooth group) could damage the coil insulation film, resulting in poor insulation, or the force concentrated on individual teeth and the teeth could be deformed. There was a problem.

  The present invention has been made to solve such a problem, and to obtain a stator of a rotating electrical machine, a stator core, and a method of manufacturing a stator that are excellent in assemblability, exhibit high efficiency and high output. With the goal.

The stator of the rotating electrical machine according to the present invention is:
A plurality of inner teeth arranged at equal intervals in an annular shape, and an inner peripheral side core comprising an annular connecting portion that connects the inner peripheral side tips of the plurality of inner teeth in the circumferential direction;
An outer peripheral side core that is annularly arranged at equal intervals, and is composed of the same number of outer teeth as the inner teeth, and an annular back yoke portion that connects the outer peripheral end portions of all the outer teeth in the circumferential direction;
In a slot formed by being surrounded by the inner peripheral core and the outer peripheral core, the inner teeth and the outer teeth are provided with a plurality of coils that are accommodated across a plurality of teeth coupled by a coupling portion,
The coil includes a first slot housing portion that is one portion housed in the slot and a second slot housing portion that is the other portion housed in the slot;
In one of the slots, the first slot housing part of one of the coils is housed inside, and the second slot housing part of the other coil is housed outside.
At least the first slot accommodating portion is accommodated in an inner slot formed between the inner teeth in the slot ,
The second slot accommodating portion is accommodated in an outer slot formed between the outer teeth .

In addition, the method for manufacturing the stator according to the present invention includes:
A method of manufacturing a stator in which coils are distributedly wound,
A plurality of inner teeth arranged at equal intervals in an annular shape and the outer peripheral side of an inner peripheral core composed of an annular connecting portion that connects the inner peripheral side tip portions of the plurality of inner teeth in the circumferential direction were wound in advance. A coil placement process for placing the coil;
The coil is moved in parallel in the radial direction, and the first slot storage portion of the two slot storage portions provided in the coil is completely stored in the inner slot formed between the inner teeth, and the second slot storage. Coil storage step of arranging the parts on the outer peripheral side of the other first slot storage unit stored in the other inner slot;
An outer peripheral side core that is annularly arranged at equal intervals and includes an outer tooth having the same number as the inner teeth and an annular back yoke portion that connects the outer peripheral end portions of all the outer teeth in the circumferential direction. An outer peripheral side in which the inner teeth and the outer teeth are press-fitted in the axial direction so as to be coupled to the side core, and at least a part of the second slot accommodating portion is accommodated in an outer slot formed between the outer teeth. Core press-in process,
A coil joining step for joining the ends of the coils.

According to the stator of the rotating electric machine according to the present invention,
The tooth portion is divided into an outer tooth connected to the back yoke portion and an inner tooth connected to an annular connecting portion for connecting the inner peripheral side distal end portion in the circumferential direction. The force that sometimes presses the coil can be suppressed. Further, when the coil is inserted from the outer peripheral side, the amount by which the interval between the two slot storage portions shrinks can be reduced, so that the coil end portion can be suppressed from increasing in the axial direction, and the coil end portion can be reduced. Further, the force applied to the teeth and the coil can be reduced. As a result, the insulation and reliability of the stator of the rotating electrical machine can be improved.

According to the stator manufacturing method of the present invention,
The first slot accommodating portion of the two slot accommodating portions provided in the coil is completely accommodated in the inner slot formed between the inner teeth, and the second slot accommodating portion is simultaneously moved in the radial direction. Since the coil storing step is arranged on the outer peripheral side of the other first slot storage portion stored in the other inner slot,
When the coil is inserted from the outer peripheral side, the amount by which the interval between the two slot storage portions shrinks can be reduced. Thereby, it can suppress that a coil end part becomes high in an axial direction, and a coil end part can be made small. Further, the force applied to the teeth and the coil can be reduced. As a result, the insulation and reliability of the stator of the rotating electrical machine can be improved.

It is a perspective view of the stator which concerns on Embodiment 1 of this invention. It is a perspective view of the stator core which concerns on Embodiment 1 of this invention. It is a top view of the stator core which concerns on Embodiment 1 of this invention. It is a top view of the outer peripheral side core which concerns on Embodiment 1 of this invention. It is a top view of the inner peripheral side core which concerns on Embodiment 1 of this invention. It is a principal part top view of the stator core which concerns on Embodiment 1 of this invention. It is a perspective view of the turtle shell coil for stators concerning Embodiment 1 of this invention. It is the arrow directional view which cut | disconnected the turtle shell coil shown in FIG. 7 by the AA line. It is principal part sectional drawing of the stator which concerns on Embodiment 1 of this invention. It is a figure which shows the insertion method of the turtle shell coil of the stator which concerns on Embodiment 1 of this invention. It is a top view which shows the state which inserted all the turtle shell coils which concern on Embodiment 1 of this invention in the inner peripheral side core. It is a front view of the turtle shell coil of a comparative example. It is a principal part upper surface schematic diagram of the stator at the time of assuming that the tortoiseshell coil of a comparative example is mounted | worn with a stator core. It is a principal part upper surface schematic diagram of the stator in the state in which the turtle shell coil which concerns on Embodiment 1 of this invention was accommodated in the slot. It is the arrow line view which cut | disconnected the stator shown in FIG. 14 by the BB line. It is principal part sectional drawing of the stator which concerns on Embodiment 2 of this invention. It is a principal part upper surface schematic diagram of the stator in the state in which the tortoiseshell coil which concerns on Embodiment 2 of this invention was accommodated in the slot. It is principal part sectional drawing of the stator which concerns on Embodiment 3 of this invention. It is a figure which shows the change of the height of a coil end part at the time of assuming that the turtle shell coil was press-fitted in the slot from the outer peripheral side.

Embodiment 1 FIG.
Hereinafter, a stator for a rotating electrical machine, a stator core, and a method for manufacturing the stator according to Embodiment 1 of the present invention will be described with reference to the drawings.
In this specification, “inner side”, “inner side”, “outer side”, “outer side”, “circumferential direction”, “axial direction”, and “radial direction” are used unless otherwise specified. The “inner side”, “inner side”, “outer side”, “outer side”, “circumferential direction”, “axial direction”, and “radial direction” of the stator of the electric machine shall be used.

FIG. 1 is a perspective view of the stator 100. However, the ends of the turtle shell coil 11 inserted into each slot are not yet connected.
FIG. 2 is a perspective view of the stator core 2 of the stator 100.
FIG. 3 is a top view of the stator core 2.
FIG. 4 is a top view of the outer core 2b.
FIG. 5 is a top view of the inner peripheral core 2a.
FIG. 6 is a top view of the main part of the stator core 2.
As shown in FIGS. 1 to 6, the stator 100 is inserted into the annular stator core 2 having a plurality of slots 5 formed between the teeth 21 adjacent in the circumferential direction, and fixed. Two sets of three-phase (U-phase, V-phase, W-phase) Y-connected stator coil groups 10 wound around the child core 2 are provided.

  As shown in FIGS. 3 to 6, the stator core 2 is composed of an inner peripheral core 2 a and an outer peripheral core 2 b, and a plurality of inner peripheral cores 2 a are arranged at substantially constant intervals in the circumferential direction. The outer peripheral core 2b is formed of an annular connecting portion 22a that connects the inner peripheral portions of the inner teeth 21a, and the outer peripheral core 2b is an annular back that connects the outer teeth 21b and the outer teeth 21b that are arranged at a substantially constant interval in the circumferential direction. It is comprised from the yoke part 22b. The inner peripheral side core 2a and the outer peripheral side core 2b are separate parts, and the outer peripheral side core 2b is axially press-fitted and assembled to the outer peripheral side of the inner peripheral side core 2a, so that the connecting portion 22a, the adjacent teeth 21, A slot 5 surrounded by the back yoke portion 22b is formed.

  The teeth 21 are configured by connecting the inner teeth 21a of the inner peripheral side core 2a and the outer teeth 21b of the outer peripheral side core 2b by a connecting portion 21c. In the present embodiment, the number of slots 5 and teeth 21 is 48, but the present invention is not limited to this.

FIG. 7 is a perspective view of the turtle shell coil 11 for the stator 100.
FIG. 8 is an arrow view of the turtle shell coil 11 shown in FIG. 7 cut along line AA.
The turtle shell coil 11 is configured by winding a single conducting wire 3 composed of a conductor portion and an insulating film covering the surface of the conductor portion into a substantially hexagonal shape.

  The tortoiseshell coil 11 is wound around the teeth 21 by disposing the respective slot storage portions in the two slots 5 across the plurality of teeth 21. Here, the slot accommodating portion (left side in FIG. 7) inserted into one slot 5 is the first slot accommodating portion 11b1, and the slot accommodating portion (right side in FIG. 7) inserted into the other slot 5 is the second. It is defined as a slot storage portion 11b2. Each of the slot accommodating portions 11b1 and 11b2 is composed of two conductive wires 3.

Further, the tortoiseshell coil 11 has a coil end portion 11c that connects the ends of the slot accommodating portions 11b1 and 11b2 on both sides in the circumferential direction on the side where the coil connections 11a1 and 11a2 exist, and a side where the coil connections 11a1 and 11a2 do not exist. And a coil end portion 11d to be connected. Therefore, the coil end portion 11 c is composed of one conductive wire 3, and the coil end portion 11 d is composed of two conductive wires 3.
The stator coil group 10 is configured by welding and connecting coil connections 11a1 and 11a2 of a plurality of turtle shell coils 11.

  In order to connect the slot accommodating portions 11b1 and 11b2 on both sides in the circumferential direction by the coil end portion 11c, it is necessary to connect the conducting wires 3 having different radial positions in the two slots 5. Accordingly, the lane change portions 11c1 and 11d1 for adjusting the radial position difference between the two slots 5 are provided in the coil end portions 11c and 11d.

Next, a method for assembling the stator 100 according to the first embodiment will be described with reference to FIGS.
FIG. 9 is a cross-sectional view of a main part of stator 100 according to Embodiment 1 of the present invention.
FIG. 10 is a diagram showing a method of inserting the turtle shell coil 11 of the stator 100 according to Embodiment 1 of the present invention. The insertion of the turtle shell coil 11 into the slot 5 is performed for all of the plurality of turtle shell coils 11 at the same time, but only three turtle shell coils 11 are illustrated in FIG.

  FIG. 10 shows a procedure for inserting the turtle shell coil 11 into the inner peripheral side core 2a, and the outer peripheral side core 2b is not yet fitted. Moreover, the slot accommodating parts 11b1 and 11b2 which gave the same hatching are two slot accommodating parts of the same turtle shell coil 11. FIG. Moreover, the slot accommodating part 11b1 and 11b2 which drew the outer periphery with the broken line have shown the state which has prepared and arrange | positioned in order to insert the turtle shell coil 11 in the inner peripheral side core 2a (coil arrangement | positioning process).

  As shown in FIG. 9, the stator core 2 is divided into an inner peripheral side core 2a and an outer peripheral side core 2b at an intermediate portion in the radial direction of the teeth 21, and therefore the teeth 21 are arranged on the inner peripheral side core 2a side. The inner teeth 21a and the outer teeth 21b on the outer peripheral side core 2b side are divided. The innermost peripheral position P of the coupling portion 21c of the inner teeth 21a and the outer teeth 21b is the second conductor 3 and the third conductor 3 from the inside out of the four conductors 3 accommodated in one slot 5. It becomes the boundary position. In addition, the coupling portion 21c has a V-shape with a cross section perpendicular to the axial direction pointed to the outer peripheral side in consideration of assemblability and the rigidity of the stator core 2.

  In one slot 5, one slot accommodating portion 11b1 and the other slot accommodating portion 11b2 of the two turtle shell coils 11 are accommodated. As shown in FIG. 9 and FIG. The slot 5a (inner slot) formed in the inner peripheral side core 2a stores one slot storage portion 11b1 (for two conductors 3), and the slot 5b (outer side) formed in the outer peripheral side core 2b. The slot) later accommodates a slot accommodating portion 11b2 (two conductors 3) of the other turtle shell coil 11. However, the outer core 2b is not yet attached in the state of FIG.

Arrows C and D in FIG. 10 indicate the direction and amount of movement (vector) in which the slot accommodating portions 11b1 and 11b2 of each turtle shell coil 11 are accommodated in the slot 5a of the inner peripheral core 2a.
As shown in the drawing, all the turtle shell coils 11 are simultaneously connected to the inner circumferential side toward the radially inner side in a state where the two conductors 3 of one slot housing portion 11b1 are stacked straight in the radial direction of the stator 100. The core 2a is translated from the outer peripheral side into the slot 5a (coil housing step). Thus, when the slot accommodating part 11b1 is completely accommodated in the slot 5a, the other slot accommodating part 11b2 reaches the entrance of the slot 5a straddling five inner teeth 21a. At this time, the slot accommodating portion 11b1 of another tortoiseshell coil 11 has already been inserted into the slot 5a inside the slot accommodating portion 11b2.

FIG. 11 is a top view showing a state where all the turtle shell coils 11 are inserted into the inner peripheral core 2a.
The slot storage portion 11b2 covers and slides on the outer peripheral side of the slot storage portion 11b1 of the other turtle shell coil 11 stored in the slot 5a of the inner peripheral core 2a. The portion 11b1 and the slot accommodating portion 11b2 of the other turtle shell coil 11 arranged outside hardly interfere with each other. Strictly speaking, when the slot accommodating portion 11b2 moves in the direction of arrow C shown in FIG. 10, it slightly intersects with the slot accommodating portion 11b1 of the other turtle shell coil 11 moving in the arrow D direction. However, the collision between the two can be prevented only by slightly delaying the movement of the slot accommodating portion 11b2 overlapping the outer peripheral side. In the state where each turtle shell coil 11 is disposed at a predetermined position, no external force is applied to any of the slot storage portions 11b1 and 11b2.

  When all the turtle shell coils 11 are arranged as shown in FIG. 11, the outer peripheral side core 2b is press-fitted into the outer peripheral side of the inner peripheral side core 2a (outer peripheral side core press-fitting step). Although not shown, before inserting the slot accommodating portion 11b1, the inner peripheral core 2a covers the inner teeth 21a and the peripheral portions of the connecting portions 22a, and the outer peripheral core 2b has outer teeth 21b. Insulating paper is disposed so as to cover the peripheral edge of the back yoke portion 22b and insulation between the slot storage portion 11b1 and the inner peripheral core 2a and between the slot storage portion 11b2 and the outer peripheral core 2b. The sex is secured. Note that the insulating paper may be wound around the slot housing portions 11b1 and 11b2 and then inserted into the inner peripheral core 2a and the outer peripheral core 2b.

  Thereafter, the coil connections 11a1 and 11a2 of the turtle shell coil 11 are joined together by, for example, TIG welding, resistance welding, or the like. A joint portion between the coil connections 11a1 and 11a2 is formed by collecting and joining two coil connections 11a1 and 11a2 in one place. However, since it is necessary to connect three points of UVW to the neutral point, three coil connections 11a1 and 11a2 are collected and joined in one place (coil joining step).

  In addition, for the coil connections 11a1 and 11a2 connected to other devices such as a power source and an inverter, an intermediary part (terminal etc.) for connecting to other devices is separately joined, or nothing is done at this stage. Proceed to the next step.

  In the present embodiment, the coil connections 11a1 and 11a2 are joined by molding and aligning the coil end portions as shown in FIG. 1. However, for example, a terminal is attached to the resin. You may couple | bond via an insert or an outsert relay part. This eliminates the need to adjust the positions of the coil connections 11a1 and 11a2, thereby simplifying the assembly process of the stator and improving the assembly of the stator coil group 10.

The storage state of the tortoiseshell coil 11 used in the present embodiment in the slot 5 will be described in more detail using a comparative example.
FIG. 12 is a front view of a turtle shell coil 13 as a comparative example of the turtle shell coil 11 of the present embodiment.
FIG. 13 is a schematic top view of the main part of the stator 113 when it is assumed that the turtle shell coil 13 is attached to the stator core 2.
FIG. 14 is a schematic top view of an essential part of the stator 100 in a state where the turtle shell coil 11 of the present embodiment is housed in the slot 5.
15 is an arrow view of FIG. 14 cut along line BB.
In FIG. 13, two turtle shell coils 13 are drawn for convenience of explanation. In this state, the slot storage portions 13 b 1 and 13 b 2 of the turtle shell coil 13 are stored one by one in all the slots 5. The same applies to the turtle shell coil 11 of FIG.

  By the way, when manufacturing the stator 100 in the assembly process as described above, the tortoiseshell coil 11 is attached to the inner peripheral side core 2a, and the outer peripheral side core 2b is connected to the inner peripheral side core 2a with the connection side (FIG. 1, FIG. It is press-fitted in the axial direction from the upper coil connection 11a1, 11a2 side.

  The turtle shell coil 13 of the comparative example has a shape in which the slot accommodating portions 13b1 and 13b2 extend straight in the axial direction as they are. In this case, as shown in FIG. 13, the coil end portion 13c of the tortoiseshell coil 13 covers and interferes with the axial extension of the coupling portion 21c of the inner teeth 21a and the outer teeth 21b, and the outer peripheral core 2b is pivoted from the connection side. It cannot press-fit into the inner peripheral core 2a in the direction.

  Therefore, in the present embodiment, as shown in FIGS. 14 and 15, two of the two tortoiseshell coils 11 arranged in the slot 5, three wires 3 from the inside of the total of four wires 3. A bent portion 16 is provided. That is, a bent portion 16 (a circled portion in FIG. 15) is provided by bending the portion where the three conducting wires 3 extend from the axial end portion of the slot 5 of the stator core 2 to the inner peripheral side. By configuring the coil connection 11a1 (connection part) and a part of the coil end part 11c in this way, as shown in FIG. 14, when the stator 100 is viewed from the axial direction, the coil end part 11c and the coil connection 11a1. The outer teeth 21b do not interfere with the turtle shell coil 11 when the outer peripheral side core 2b is press-fitted into the inner peripheral side core 2a.

  According to the stator of the rotating electrical machine, the stator core, and the stator manufacturing method according to the present embodiment, in the step of inserting the turtle shell coil 11 into the inner peripheral core 2a, the turtle shell coil 11 is added into the slot 5. There is no need to press in. Thereby, since there is no deformation | transformation of the tortoiseshell coil 11, the quality and insulation of the tortoiseshell coil 11 improve. Moreover, since there is no load applied to the side surface of the inner teeth 21a when the turtle shell coil 11 is inserted into the slot 5, the inner teeth 21a can be prevented from being deformed, and the assemblability of the stator 100 is improved.

  FIG. 19 is a diagram showing a change in the height of the coil end portion 11 c when it is assumed that the turtle shell coil 11 is press-fitted into the slot 5 from the outer peripheral side. It can be seen that the height of the coil end portion 11c increases in the axial direction when the tortoiseshell coil 11 is mounted while reducing the distance between the two slot storage portions 11b1 and 11b2 by press-fitting. However, in the present embodiment, since the slot storage portions 11b1 and 11b2 are not stored in the two slots 5 while the interval between the slot storage portions 11b1 and 11b2 is reduced, the coil end portion 11c of the tortoiseshell coil 11 after being stored in the slot 5 is higher in the axial direction. Never become.

  The first slot storage portion 11b1 and the second slot storage portion 11b2 of the turtle shell coil 11 are each composed of two conductors 3, but the number is not limited to this, and each slot storage portion There is no problem even if the number of the conductive wires 3 constituting the part is different. For example, if the number of the conductive wires 3 of the slot accommodating portions 11b1 and 11b2 is N (N is an even number equal to or larger than 2), and the coupling portion 21c is provided between the N / 2th and (N / 2) + 1th from the inside good.

  Although not shown in the present embodiment, the number of slots per phase of the stator 100 can be set to 2 (= 48 ÷ (8 × 3)) by setting the number of poles of the rotor to 8. . Thereby, the rotary electric machine using the stator 100 can be driven by a doubled inverter (not shown). By driving the rotating electrical machine in a double system, the ripple current can be lowered by shifting the phase of each phase and increasing the order of the harmonics. Further, by using two independent drive circuits (inverters) that drive and control the rotating electrical machine, redundancy of the rotating electrical machine can be obtained.

  Further, although the number of slots 5 of the stator 100 is shown as 48, the number of slots is not limited to this. Further, the number of turtle shell coils 11 to be inserted into each slot 5 is the same as the number of slots 5, but the present invention is not limited to this. For example, even if n times as many turtle shell coils 11 as slots 5 are inserted, there is a problem. Absent. Moreover, although the shape of the coupling | bond part 21c of the inner side teeth 21a and the outer side teeth 21b which concerns on this Embodiment made the cross section perpendicular | vertical to an axial direction V shape, a shape is not limited to this. . For example, any shape may be used as long as the shape is a combination of a concave portion and a convex portion.

Embodiment 2. FIG.
Hereinafter, a stator for a rotating electrical machine, a stator core, and a method for manufacturing the stator according to the second embodiment of the present invention will be described with reference to the drawings, focusing on portions different from the first embodiment.
FIG. 16 is a cross-sectional view of a main part of stator 200 according to the present embodiment.
FIG. 17 is a schematic top view of the main part of the stator 200 in a state where the turtle shell coil 211 is housed in the slot 205. In FIG. 17, not all the turtle shell coils 211 are depicted.
In the stator core 202, the configuration of the inner teeth 221a of the inner peripheral side core 202a, the connecting portion 221c of the outer teeth 221b of the outer peripheral side core 202b, and the position P2 on the innermost peripheral side of the connecting portion 221c is the same as that of the first embodiment. Different from child core 2.

  In the present embodiment, as shown in the figure, the innermost circumferential position P2 of the coupling portion 221c is set to the inner circumference out of the total of four conductors 3 of the two tortoiseshell coils 211 arranged in the same slot 205. It is set between the third conducting wire 3 and the fourth conducting wire 3 from the side. Accordingly, the radial length of the inner teeth 221a is longer than the radial length of the outer teeth 221b.

  In the method of assembling the stator of the stator 200 according to the present embodiment, the step of pressing and inserting the tortoiseshell coil 11 from the outer peripheral side to the inner peripheral side after arranging all the tortoiseshell coils 11 as compared with the first embodiment is required. It becomes. However, as compared with a configuration in which the entire teeth portion is press-fitted into the annular yoke portion as in Patent Document 1, the pressing force necessary for press-fitting the turtle shell coil 11 is small. In addition, the interval between the two slot storage portions 211b1 and 211b2 before and after the two slot storage portions 211b1 and 211b2 of the tortoiseshell coil 211 are press-fitted into each slot 205 is reduced by press-fitting one tortoiseshell coil without dividing the teeth. Therefore, the deformation of the coil, the increase in the height of the coil end portion, and the deformation of the teeth can be reduced.

Next, the press-fitting of the outer peripheral side core 202b will be described with reference to the drawings.
As in the first embodiment, the outer peripheral side core 202b is press-fitted into the inner peripheral side core 202a in the axial direction from the connection side. As shown in FIG. 17, unlike the first embodiment, if the connecting portion 221c of the inner teeth 221a and the outer teeth 221b is provided between the third conductor 3 and the four conductors 3 from the inner peripheral side, the coil end Even if the portion 211c and the coil connection 211a1 are not inclined to the inner peripheral side, the coil end portion 211c and the coupling portion 221c of the teeth 221 do not interfere when the outer peripheral side core 202b is press-fit from the axial direction.

  According to the stator of the rotating electrical machine, the stator core, and the stator manufacturing method according to the present embodiment, the deformation of the tortoiseshell coil 211, the increase in the height of the coil end portion 211c, and the deformation of the teeth 221 are suppressed. Is possible. Moreover, in order to prevent the coil end part 211c from interfering with the outer teeth 221b when the outer peripheral side core 2b is press-fitted as in the first embodiment, there is no need to bend the coil end part 211c to the inner peripheral side, The coil end part 211c can be made small.

Embodiment 3 FIG.
Hereinafter, a stator for a rotating electrical machine, a stator core, and a method for manufacturing a stator according to a third embodiment of the present invention will be described with reference to the drawings, focusing on portions different from the first embodiment.
FIG. 18 is a cross-sectional view of a main part of stator 300 according to the present embodiment.
In the present embodiment, eight conductors 3 are arranged in the slot 305 of the stator core 302. Further, the tortoiseshell coil 311 to be used is provided with slot housing portions 311b1 and 311b2 that are inserted into the slot 305 and disposed. Each of the slot accommodating portions 311b1 and 311b2 is composed of four conductive wires 3.

  A position P3 on the innermost peripheral side of the coupling portion 321c of the inner teeth 321a of the inner peripheral side core 302a and the outer teeth 321b of the outer peripheral side core 302b is at the radial center portion of the sixth conductor 3, and Embodiment 1 2 is in a position different from the position adopted in FIG. Also in such a stator core 302, as in FIG. 15 of the first embodiment, the coil end portion of the tortoiseshell coil covers the axial extension of the coupling portion 321c of the outer teeth 321b and the inner teeth 321a and does not interfere. Thus, the amount of press-fitting from the outer peripheral side of the turtle shell coil 311 can be reduced by providing a bent portion obtained by bending the conductive wire 3 extending from the axial end of the slot 305 of the stator core 302 toward the inner peripheral side. .

  Even in the stator, stator core, and stator manufacturing method according to the third embodiment, the deformation of the coil, the increase in the height of the coil end portion, and the deformation of the teeth are suppressed as compared with the conventional example. It is possible. In the present embodiment, the innermost peripheral position P3 of the coupling portion 321c of the teeth 321 is the sixth central position from the inside, but the present invention is not limited to this.

  It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

100, 113, 200, 300 Stator, 10 Stator coil group,
11, 13, 211, 311 Tortoise shell coil, 11a1 coil connection,
11b, 11b1, 11b2, 13b1, 311b1 slot storage portion,
11c, 13c, 11d, 211c, 311c coil end portion,
11c1 Lane change part, 16 bent part, 2,202,302 stator core,
2a, 202a, 302a inner peripheral side core, 2b, 202b, 302b outer peripheral side core,
21,221 teeth, 21a, 221a, 321a Inner teeth,
21b, 221b, 321b outer teeth, 21c, 221c, 321c joint,
22a connecting part, 22b back yoke part, 3 conductor,
5, 5a, 5b, 205, 305 slots, C, D arrows, P, P2, P3 positions.

Claims (7)

A plurality of inner teeth arranged at equal intervals in an annular shape, and an inner peripheral side core comprising an annular connecting portion that connects the inner peripheral side tips of the plurality of inner teeth in the circumferential direction;
An outer peripheral side core that is annularly arranged at equal intervals, and is composed of the same number of outer teeth as the inner teeth, and an annular back yoke portion that connects the outer peripheral end portions of all the outer teeth in the circumferential direction;
In a slot formed by being surrounded by the inner peripheral core and the outer peripheral core, the inner teeth and the outer teeth are provided with a plurality of coils that are accommodated across a plurality of teeth coupled by a coupling portion,
The coil includes a first slot housing portion that is one portion housed in the slot and a second slot housing portion that is the other portion housed in the slot;
In one of the slots, the first slot housing part of one of the coils is housed inside, and the second slot housing part of the other coil is housed outside.
At least the first slot accommodating portion is accommodated in an inner slot formed between the inner teeth in the slot ,
The second slot housing portion is a stator of a rotating electrical machine housed in an outer slot formed between the outer teeth. The coil, conductor of the N within the slot (N is an even number of at least two) of the stator of the rotating electric machine according to claim 1 which are stacked in the radial direction. Of the conducting wire constituting the first slot housing portion and the conducting wire constituting the second slot housing portion, the (N / 2) + 1th conducting wire from the inside extends from the inside of the slot. The stator of the rotating electrical machine according to claim 2 , wherein the coil end portion and the connecting portion that are formed form a bent portion that is bent radially inward. The inner teeth are longer than the outer teeth,
In the coil, N wires (N is an even number of 2 or more) are stacked in the slot in the radial direction,
The coil end part and the connecting part, which join the part extending from the slot among the conducting wire constituting the first slot accommodating part and the conducting wire constituting the second slot accommodating part, stator according to claim 1 which does not overlap the coupling portion when viewed from the axial direction. 5. The stator for a rotating electrical machine according to claim 4 , wherein an innermost position of the coupling portion is between an N−1 coil and an N coil from the inside of the N conductive wires. A method of manufacturing a stator in which coils are distributedly wound,
A plurality of inner teeth arranged at equal intervals in an annular shape and the outer peripheral side of an inner peripheral core composed of an annular connecting portion that connects the inner peripheral side tip portions of the plurality of inner teeth in the circumferential direction were wound in advance. A coil placement process for placing the coil;
The coil is moved in parallel in the radial direction, and the first slot storage portion of the two slot storage portions provided in the coil is completely stored in the inner slot formed between the inner teeth, and the second slot storage. Coil storage step of arranging the parts on the outer peripheral side of the other first slot storage unit stored in the other inner slot;
An outer peripheral side core that is annularly arranged at equal intervals and includes an outer tooth having the same number as the inner teeth and an annular back yoke portion that connects the outer peripheral end portions of all the outer teeth in the circumferential direction. An outer peripheral side in which the inner teeth and the outer teeth are press-fitted in the axial direction so as to be coupled to the side core, and at least a part of the second slot accommodating portion is accommodated in an outer slot formed between the outer teeth. Core press-in process,
The manufacturing method of the stator provided with the coil joining process which joins the edge parts of each said coil. The said coil accommodation process is a manufacturing method of the stator of Claim 6 which has a press process which presses the said coil to radial inside at the end of the said coil accommodation process.

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