JP2016214010A - Stator and rotary electric machine having them - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator capable of easily ensuring an insulation space and reducing a size.SOLUTION: A stator 2 comprises a stator core 10 and a coil 20. Each of segment conductors 30, 40, 50, and 60 arranged in a slot 11 of the stator core 10 is connected in an end part so as to face first surfaces 9a each other. The first surfaces 9a to be connected and faced are formed in a parallel to a radial direction R. Horizontal parts 32c and 33c of the segment conductor 30 arranged to the most inside of the slot 11 are bend to the out side toward to vertical parts 42b and 43b of the segment conductor 40 arranged to the second position from the inner side in the other slot 11 so as to bent a second surface 9b, and are connected to the vertical parts 42b and 43b of the segment conductor 40 arranged to the second position from the inside.SELECTED DRAWING: Figure 18

Description

  The present invention relates to a stator and a rotating electrical machine including the stator.

In recent years, hybridization of vehicles has been attempted, and many drive motors are used. Such a drive motor is required to have a high output and a small size, and a rectangular wire is used to improve the space factor (see, for example, Patent Document 1).
FIG. 23 is a schematic diagram showing the internal configuration of the motor shown in Patent Document 1. As shown in FIG. A motor 1000 shown in FIG. 23 is provided with a stator core 1002 on which a rectangular wire 1001 is disposed, a rotor 1003, a shaft 1004, and a housing 1005 for housing them. The shaft 1004 is rotatably supported by the housing 1005 by bearings 1006 provided at the top and bottom.

  In such a configuration, by supplying electricity to the rectangular wire 1001, the rotor 1003 rotates, and the shaft 1004 fixed to the rotor 1003 also rotates.

JP 2012-139075 A

However, in the driving motor shown in Patent Document 1, a flat wire 1001 protrudes along the shaft 1004 from above and below the stator core 1002. Therefore, as shown in the enlarged view J, the distance S between the flat wire 1001 and the housing 1005 is narrowed, and it is difficult to reduce the size of the motor if an insulation distance is to be ensured between the flat wire 1001 and the housing 1005.
In view of the conventional problems, an object of the present invention is to provide a stator that can easily secure an insulating space and can be miniaturized, and a rotating electrical machine using the stator.

  In the stator according to the first invention, the stator core is cylindrical, and has a plurality of slots formed along the radial direction on the inner side thereof. The coil has a plurality of segment conductors arranged in the slot, and the end portions of the segment conductors are joined to each other. The segment conductor has a rectangular cross section, has a first surface and a second surface that is narrower than the first surface, and is disposed in the slot so that the first surface is parallel to the radial direction. In each slot, a plurality of segment conductors are arranged so that the second surfaces of the slots face each other. The plurality of segment conductors are joined at each end so that the first surfaces face each other. The joined first surfaces are formed in parallel with the radial direction. The segment conductor has an in-slot portion disposed in the slot, a first projecting portion projecting from the first end surface of both end surfaces of the stator core, and a second projecting portion projecting from the second end surface of both end surfaces. . The end portions are provided on both the first projecting portion and the second projecting portion. The opposed first surfaces that are joined are provided on both the first projecting portion side and the second projecting portion side. The end of the segment conductor arranged at the innermost side of the slot is bent outward toward the end of the segment conductor arranged second from the inside in the other slot so that the second surface is curved. The end of the segment conductor arranged second from the inside is joined.

Parallel in this specification does not mean only parallel in a strict sense. Since variations occur due to machining, bending, and assembly of the component parts, they do not necessarily fall within the accuracy defined by geometry, but in the present application, they are described as being parallel.
Thus, since the end portion of the segment conductor arranged on the innermost peripheral side of the slot is bent outward, it is easy to secure a space in the coil end portion inside the stator. Thereby, even if it is a case where size reduction of a rotary electric machine is achieved, insulation space can be ensured inside a stator.

Further, since a space can be secured inside the stator, the size of the shaft bearing can be increased, and the reliability can be improved.
Further, since the segment conductors are joined to each other with the wide first surfaces, sufficient joining strength can be ensured.
In order to obtain strength and conductivity, it is necessary to secure the same cross-sectional area as that of the segment conductor at the joint portion. However, since the wide first surfaces are opposed to each other, the joint depth is set to the second depth. The height of the coil end portion can be suppressed by securing the width of the surface.

A stator according to a second invention is the stator according to the first invention, wherein the end of the segment conductor arranged at the outermost side of the slot is in the other slot so that the second surface is curved. It is bent inward toward the end portion of the segment conductor arranged second from the outside, and joined to the end portion of the segment conductor arranged second from the outside.
As described above, since the end portions of the segment conductors arranged on the outermost side of the slot are bent inward, it is easy to secure a space on the outer side of the stator.
As a result, a space can be ensured both inside and outside the stator, so that the rotating electrical machine can be reduced in size while securing an insulating space.

  In the stator according to the third aspect of the invention, the stator core is cylindrical and has a plurality of slots formed along the radial direction on the inside thereof. The coil has a plurality of segment conductors arranged in the slot, and the end portions of the segment conductors are joined to each other. The segment conductor has a rectangular cross section, has a first surface and a second surface that is narrower than the first surface, and is disposed in the slot so that the first surface is parallel to the radial direction. In each slot, a plurality of segment conductors are arranged so that the second surfaces of the slots face each other. The plurality of segment conductors are joined at each end so that the first surfaces face each other. The joined first surfaces are formed in parallel with the radial direction. The segment conductor has an in-slot portion disposed in the slot, a first projecting portion projecting from the first end surface of both end surfaces of the stator core, and a second projecting portion projecting from the second end surface of both end surfaces. . The end portions are provided on both the first projecting portion and the second projecting portion. The opposed first surfaces that are joined are provided on both the first projecting portion side and the second projecting portion side. The end of the segment conductor arranged at the outermost side of the slot is bent inward toward the end of the segment conductor arranged second from the outside in the other slot so that the second surface is curved. The end of the segment conductor arranged second from the outside is joined.

  As described above, since the end portion of the segment conductor arranged on the outermost side of the slot is bent inward, it is easy to secure a space inside the stator by the amount of bending. Thereby, even if it is a case where size reduction of a rotary electric machine is achieved, insulation space can be ensured inside a stator.

A stator according to a fourth aspect is the stator according to any one of the first to third aspects, wherein the segment conductor arranged i-th (i is an integer of 1 or more) from the inside of the stator core is in another slot. Are joined at the respective end portions so that the first conductor faces the segment conductor arranged i + 1.
Thereby, the segment conductors arranged in different slots are joined together.
A stator of a fifth invention is the stator of any one of the first to fourth inventions, and four segment conductors are arranged in each slot.
Thus, a stator in which four segment conductors are arranged in the slot can be configured.

A rotating electrical machine according to a sixth aspect of the invention includes the stator according to any one of the first to fifth aspects of the invention, and a rotor disposed inside the stator.
As a result, it is possible to realize a rotating electrical machine that can easily secure an insulating space around the periphery and can be downsized.

  ADVANTAGE OF THE INVENTION According to this invention, the stator which can ensure an insulation space around and can achieve size reduction, and a rotary electric machine using the same can be provided.

The perspective view which shows the rotary electric machine which concerns on Embodiment 1 of this invention. The figure which shows the internal structure of the rotary electric machine of FIG. The perspective view which shows the stator of the rotary electric machine of FIG. The top view of the stator core in the stator of FIG. 3A is a perspective view showing a rectangular wire forming the coil of FIG. 3, FIG. 5B is a plan view of the rectangular wire shown in FIG. 5A, and FIG. 5C is an arrangement of the rectangular wire shown in FIG. FIG. The perspective view which shows the U-phase coil part group of the stator of FIG. The perspective view which shows the U-phase coil part of the stator of FIG. The perspective view which shows the U-phase coil part of the stator of FIG. The perspective view which shows the segment conductor of the U-phase coil part of FIG. The perspective view which shows the segment conductor of the U-phase coil part of FIG. The perspective view which shows the segment conductor of the U-phase coil part of FIG. The perspective view which shows the segment conductor of the U-phase coil part of FIG. The schematic diagram which showed the state which has arrange | positioned one U-phase coil part group to the stator core of FIG. The schematic diagram which showed the state which has arrange | positioned two U-phase coil part groups to the stator core of FIG. 4 planarly. The perspective view which shows the state which combined the two U-phase coil part groups shown in FIG. The perspective view which shows the state which has arrange | positioned the two U-phase coil part groups shown in FIG. 15 in the stator core. The schematic diagram which showed the state which has arrange | positioned four U-phase coil part groups to the stator core of FIG. 4 planarly. The top view for demonstrating joining of the segment conductor of FIG. 9 and the segment conductor of FIG. 10, and joining of the segment conductor of FIG. 11, and the segment conductor of FIG. The top view for demonstrating arrangement | positioning of the segment conductor of each phase in the stator shown in FIG. The flowchart which shows the process for forming the segment conductor of FIGS. (A), (b), (c) The figure for demonstrating formation of the segment conductor of FIG. (A), (b) The figure which shows the junction part using the segment conductor in the coil of the modification of embodiment concerning this invention. The figure which shows the internal structure of the conventional rotary electric machine.

A stator and a rotating electrical machine according to an embodiment of the present invention will be described below with reference to the drawings.
(Embodiment 1)
<1. Configuration>
FIG. 1 is a perspective view showing an external appearance of the rotating electrical machine 1 of the present embodiment, and FIG. 2 is a cross-sectional view taken along a plane passing through the central axis A to show the internal configuration of the rotating electrical machine 1 of FIG. .

1 and 2, a swing machinery 100 is shown as an example of an object driven by the driving force of the rotating electrical machine 1 of the present embodiment.
The rotating electrical machine 1 of the present embodiment is disposed on the upper side of the swing machinery 100, and the driving force generated in the rotating electrical machine 1 is transmitted to the swing machinery 100. Here, the swing machinery 100 turns an upper turning body having a work implement or the like with respect to a lower traveling body having a crawler track in a work vehicle such as a hydraulic excavator. The rotational driving force of the rotating electrical machine 1 is transmitted to the output gear through the speed reduction mechanism, and the swing machinery 100 rotates and moves inside or outside the swing circle engaged with the output gear. Turns.

(Rotating electrical machine 1)
The rotating electrical machine 1 according to the first embodiment is a three-phase AC rotating electrical machine, and includes a stator 2, a rotor 3, a shaft 4, and a housing 5 for housing them as shown in FIG.
The housing 5 is disposed on the upper side of the swing machinery 100 and has a cylindrical portion 91, a ceiling portion 92, and a bottom surface portion 93.

The stator 2 is disposed in the housing 5 and will be described in detail later. The stator 2 has an annular shape having a space in the center and includes a coil 20.
The rotor 3 is rotatably disposed in the central space of the stator 2. The rotor 3 has a cylindrical shape, and a magnet is provided on the outer peripheral side thereof. The rotor 3 rotates about a central axis A provided in the vertical direction in the drawing.
The shaft 4 is disposed at the center of the rotor 3 and rotates together with the rotor 3. A bearing portion 6 a that rotatably supports the shaft 4 is provided on the ceiling portion 92 of the housing 5, and a bearing portion 6 b is provided on the bottom surface portion 93. The shaft 4 is connected to a shaft (not shown) of the swing machinery 100 at the lower end thereof.

(Stator 2)
FIG. 3 is a perspective view showing the stator 2 of the present embodiment. As shown in FIG. 3, the stator 2 of the present embodiment has a central axis A, has a cylindrical stator core 10, and a coil 20 attached to the stator core 10, and has an upper end surface 10 a and a lower end surface 10 b. Have.

FIG. 4 is a plan view showing the stator core 10. A slot 11 is formed in the stator core 10 from the inner peripheral surface 10c toward the outer peripheral surface 10d. Forty-eight slots 11 are formed at equal intervals, and teeth 12 are formed between the slots 11. Further, the opening of the slot 11 provided in the inner peripheral surface 10c is indicated as 11a.
As shown in FIG. 4, the central axis of the stator core 10 is indicated by A, the circumferential direction is indicated by C, and the radial direction is indicated by R in a plan view viewed from the axial direction. The central axis A is the rotation center of the rotor 3, and the axial direction indicates a direction parallel to the central axis A. The circumferential direction C is a direction along the outer peripheral surface 10 d of the stator core 10. Here, in the circumferential direction C, the counterclockwise direction in a plan view when the upper end surface 10a is viewed from above in the axial direction is C1, and the clockwise direction is C2. When described as the circumferential direction C, both C1 and C2 are shown. The radial direction R is a direction connecting the outer peripheral surface 10d of the stator core 10 from the central axis A in a plan view viewed from the axial direction. Of the radial direction R, the inner direction is indicated as R1, and the outer direction is indicated as R2.

  In the present embodiment, the vertical direction is defined in a state where the central axis A is arranged in a direction perpendicular to the ground, and the upper end surface of the stator core 10 is called the upper end surface 10a, and the lower end surface is called the lower end surface 10b. However, the arrangement direction of the stator core 10 is not limited to this direction, and may be arranged so that the central axis A is horizontal with respect to the ground. Horizontal in this specification does not mean only horizontal in a strict sense. Since variations occur due to machining, bending, and assembly of the component parts, they do not necessarily fall within the accuracy defined by geometry, but in the present application, they are described as horizontal.

(Flat wire 9)
Next, the flat wire 9 forming the coil 20 will be described.
The flat wire 9 is made of, for example, copper, and its surface is covered with an insulating film such as enamel.
As shown in FIGS. 5A and 5B, the flat wire 9 has a rectangular cross-sectional shape, and has a first surface 9a facing each other and a second surface 9b facing each other. When the width of the first surface 9a is W1, and the width of the second surface 9b is W2, W1 is formed larger than W2. The ratio of W1 and W2 is, for example, 2: 1 to 3: 1. FIG. 5C is a diagram showing the arrangement of the flat wire 9 in the slot 11. Although details will be described later, in the present embodiment, a total of four segment conductors 30, 40, 50, 60 are arranged in order from the inner peripheral surface 10 c side in one slot 11. The segment conductors 30, 40, 50, 60 are such that the first surface 9 a of each rectangular wire 9 is perpendicular to the circumferential direction C (which can also be said to be parallel to the radial direction R), and the second surface 9 b of the adjacent rectangular wire 9. They are arranged so that they face each other.

(Coil 20)
The coil 20 of this embodiment has a plurality of phase coils 21. Since the rotary electric machine 1 of this embodiment is a three-phase rotary electric machine, a U-phase coil 21U, a V-phase coil 21V, and a W-phase coil 21W are provided as the phase coil 21 as shown in FIG. Each phase coil 21 includes a plurality of coil portions 22 formed by joining a plurality of segment conductors 30 and 40, and a plurality of coil portions 23 formed by joining a plurality of segment conductors 50 and 60. Have.

(Phase coil 21)
Since the configurations of the phase coils 21 of the U-phase coil 21U, the V-phase coil 21V, and the W-phase coil 21W are substantially the same, the U-phase coil 21U will be described below as an example.
The U-phase coil 21U is configured by combining four U-phase coil unit sets 24U each having a U-phase coil unit 22U and a U-phase coil unit 23U.

FIG. 6 is a perspective view showing the U-phase coil unit set 24U. FIG. 7 is a perspective view of the U-phase coil portion 22U. FIG. 8 is a perspective view of the U-phase coil portion 23U.
The U-phase coil portion 22U is formed by joining the segment conductor 30 and the segment conductor 40 formed by the flat wire 9.
The U-phase coil portion 23U is formed by joining a segment conductor 50 and a segment conductor 60 formed by the flat wire 9.
The flat wire 9 will be described first.

(Coil part 22)
As shown in FIG. 7, the U-phase coil portion 22 </ b> U is formed by alternately connecting four segment conductors 30 and four segment conductors 40 along the circumferential direction C.
The upper ends of one segment conductor 30 and one segment conductor 40 form coil portion ends 22a and 22b that are ends of the U-phase coil portion 22U. The segment conductor 40, the segment conductor 30, the segment conductor 40, the segment conductor 30, the segment conductor 40, the segment conductor 30, and the segment conductor 40 in the counterclockwise direction when viewed from above from the segment conductor 30 having the coil portion end 22 a. It arrange | positions along the circumferential direction C1 in order.

The coatings on both ends of the segment conductors 40 and 30 are peeled off, and portions where the coatings are peeled off are indicated by 40E and 30E.
When the segment conductor 30 having the coil portion end 22a, which is the end of the U-phase coil portion 22U, is numbered sequentially in the circumferential direction C1 as the first segment conductor 40 (shown by dots in FIG. 7), the first The segment conductor 30 and the second segment conductor 40 are joined at the joint 22d at the lower end thereof. The 2nd segment conductor 40 and the 3rd segment conductor 30 are joined by junction part 22c of each upper end. The 3rd segment conductor 30 and the 4th segment conductor 40 are joined by joining part 22d of each lower end. The fourth segment conductor 40 and the fifth segment conductor 30 are joined at the joint 22c at the respective upper ends. The fifth segment conductor 30 and the sixth segment conductor 40 are joined at the joint 22d at their lower ends. The sixth segment conductor 40 and the seventh segment conductor 30 are joined at the joint 22c at the respective upper ends. The seventh segment conductor 30 and the eighth segment conductor 40 are joined at the joint 22d at the lower end thereof. An upper end portion of the eighth segment conductor 40 forms a coil portion end 22 b that is an end of the coil portion 22.

As described above, the segment conductor 30 is joined to the segment conductor 40 arranged next to the circumferential direction C1 side by the joining portion 22d at the lower end, and the segment conductor 40 arranged next to the circumferential direction C2 side. Are joined at the joint 22c at the upper end.
Next, the segment conductors 30 and 40 forming each phase coil portion 22 will be described.

(Segment conductor 40)
FIG. 9 is a perspective view showing the segment conductor 40. As described in FIG. 5A, the segment conductor 40 is disposed in the slot 11 with the first surface 9 a perpendicular to the circumferential direction C.
The segment conductor 40 is formed by bending the rectangular wire 9 while keeping the first surface 9a perpendicular to the circumferential direction C (the first surface 9a is parallel to the radial direction R). The segment conductor 40 is formed while the first surface 9a is kept parallel to the radial direction R.
The segment conductor 40 protrudes from the upper end surface 10a and the lower end surface 10b of the stator core 10 in a state where it is disposed in the slot 11 as shown in FIG. The segment conductor 40 has a linear portion 41 disposed in the slot 11, a first protruding portion 42 protruding from the upper end surface 10a, and a second protruding portion 43 protruding from the lower end surface 10b. The first protrusion 42 is bent in the circumferential direction C1 with respect to the straight line portion 41, and the second protrusion 43 is bent in the circumferential direction C2.

The first projecting portion 42 of the segment conductor 40 includes an inclined portion 42a formed in the circumferential direction C1 from the upper end of the linear portion 41 (the portion protruding from the slot 11), and the upper end surface 10a from the tip of the inclined portion 42a. And a vertical portion 42b formed in the vertical direction.
In the bent portion between the straight portion 41 and the inclined portion 42a, and between the inclined portion 42a and the vertical portion 42b, the first surface 9a side of the flat wire 9 is bent, and the second surface 9b is held on the same plane. . Vertical in this specification does not mean only vertical in a strict sense. Since variations occur due to machining, bending, and assembly of the component parts, the accuracy does not necessarily fall within the accuracy defined by the geometry, but in this application, it is described as vertical.

The second projecting portion 43 of the segment conductor 40 includes an inclined portion 43a formed by being bent toward the lower end surface 10b in the circumferential direction C2 from the lower end (the portion protruding from the slot 11) of the linear portion 41, and the inclined portion 43a. And a vertical portion 43b formed in a vertical direction with respect to the lower end surface 10b.
In the bent portion between the straight portion 41 and the inclined portion 43a and between the inclined portion 43a and the vertical portion 43b, the first surface 9a side of the flat wire 9 is bent, and the second surface 9b is held on the same plane. .

(Segment conductor 30)
FIG. 10 is a perspective view showing the segment conductor 30. As described in FIG. 5A, the segment conductor 30 has the first surface 9 a disposed in the slot 11 in a state perpendicular to the circumferential direction C.
The segment conductor 30 is formed by bending the rectangular wire 9 while keeping the first surface 9a perpendicular to the circumferential direction C (the first surface 9a is parallel to the radial direction R). The segment conductor 30 is formed in a state in which the first surface 9a is kept parallel to the radial direction R.

  The segment conductor 30 protrudes from the upper end surface 10a and the lower end surface 10b of the stator core 10 in a state where it is disposed in the slot 11 as shown in FIG. As shown in FIG. 5, the segment conductor 30 has a straight portion 31 disposed in the slot 11, a first protrusion 32 protruding from the upper end surface 10a, and a second protrusion 33 protruding from the lower end surface 10b. doing. With reference to the straight line portion 31, the first protrusion 32 is bent in the circumferential direction C2, and the second protrusion 33 is bent in the circumferential direction C1.

  The first projecting portion 32 of the segment conductor 30 includes an inclined portion 32a formed in the circumferential direction C2 from the upper end of the linear portion 31 (the portion that protrudes from the slot 11), and the upper end surface 10a from the tip of the inclined portion 32a. A vertical portion 32b formed in the vertical direction and a horizontal portion 32c extending from the tip of the vertical portion 32b in the outer circumferential direction (radially outer side R2) of the stator core 10 and formed in parallel with the upper end surface 10a. Have.

  The bent portion between the straight portion 31 and the inclined portion 32a and the bent portion between the inclined portion 32a and the vertical portion 32b are bent on the first surface 9a side of the flat wire 9 and the second surface 9b is on the same plane. Is retained. The bent portion between the vertical portion 32b and the horizontal portion 32c is bent on the second surface 9b side of the flat wire as shown in the enlarged view of the T portion in FIG. 10, and the first surface 9a is held on the same plane. When the segment conductor 30 is attached to the stator core 10, the flat wire 9 is bent about 90 degrees from the vertical portion 32b to the horizontal portion 32c. The direction in which the flat wire 9 is bent is the direction toward the radially outer side R2 when the segment conductor 30 is attached to the stator core 10.

The second projecting portion 33 of the segment conductor 30 includes an inclined portion 33a formed in the circumferential direction C1 from the lower end of the straight portion 31 (the portion that protrudes from the slot 11), and the lower end surface 10b from the tip of the inclined portion 33a. A vertical portion 33b formed in the vertical direction and a horizontal portion 33c formed extending from the tip of the vertical portion 33b in the outer peripheral direction of the stator core 10.
The bent portion between the straight portion 31 and the inclined portion 33a and the bent portion between the inclined portion 33a and the vertical portion 33b are bent on the first surface 9a side of the flat wire 9, and the second surface 9b is on the same plane. Is retained. The bent portion between the vertical portion 33b and the horizontal portion 33c is bent on the second surface 9b side of the rectangular wire, and the first surface 9a is held on the same plane. The flat wire 9 is bent about 90 degrees from the vertical portion 33b to the horizontal portion 33c. The direction in which the flat wire 9 is bent is a direction toward the radially outer side R2 when the segment conductor 30 is mounted on the stator core 10.

  As shown in the enlarged view of the S portion in FIG. 7, the vertical portion 42b of the segment conductor 40 and the horizontal portion 32c of the segment conductor 30 are joined at the joining portion 22c by TIG welding or the like. TIG welding is performed from above (see arrow K). Moreover, the vertical part 43b of the segment conductor 40 and the horizontal part 33c of the segment conductor 30 are joined by the joining part 22d, and each phase coil 21 is formed.

(Coil part 23)
As shown in FIG. 8, the U-phase coil portion 23 </ b> U is formed by alternately connecting four segment conductors 50 and four segment conductors 60 along the circumferential direction C.
The upper ends of one segment conductor 50 and one segment conductor 60 form coil portion ends 23a and 23b that are ends of the U-phase coil portion 23U. The segment conductor 50, the segment conductor 60, the segment conductor 50, the segment conductor 60, the segment conductor 50, the segment conductor 50, and the segment conductor 60 in a counterclockwise direction when viewed from above from the segment conductor 50 having the coil end 23 a. It arrange | positions along the circumferential direction C1 in order.

The coatings on both ends of the segment conductors 50 and 60 are peeled off, and the portions where the coatings are peeled off are indicated by 50E and 60E.
Similarly to the U-phase coil portion 22U, the segment conductor 50 having the coil portion end 22a that is the end of the U-phase coil portion 23U is set as the first segment conductor 50 (indicated by dots in FIG. 8) in the circumferential direction C1. A number will be added to the description. The 1st segment conductor 50 and the 2nd segment conductor 60 are joined by junction part 23d of each lower end. The second segment conductor 60 and the third segment conductor 50 are joined at the joint 23c at the respective upper ends. The third segment conductor 50 and the fourth segment conductor 60 are joined at the joint 23d at the lower end. The fourth segment conductor 60 and the fifth segment conductor 50 are joined at the joint 23c at the respective upper ends. The fifth segment conductor 50 and the sixth segment conductor 60 are joined at the joint 23d at the lower end thereof. The sixth segment conductor 60 and the seventh segment conductor 50 are joined at the joint 23c at the respective upper ends. The seventh segment conductor 50 and the eighth segment conductor 60 are joined at the joint 23d at the lower end thereof. An upper end portion of the eighth segment conductor 60 forms a coil portion end 23 b that is an end of the coil portion 23.

(Segment conductor 50)
FIG. 11 is a perspective view showing the segment conductor 50. As described in FIG. 5A, the segment conductor 50 is disposed in the slot 11 with the first surface 9 a perpendicular to the circumferential direction C. The segment conductor 50 has the same configuration as the segment conductor 40 described above, but the direction in which the protruding portion is bent is different from that of the segment conductor 40.

The segment conductor 50 includes a straight portion 51 disposed in the slot 11, a first protrusion 52 protruding from the upper end surface 10a, and a second protrusion 53 protruding from the lower end surface 10b. The first projecting portion 52 is bent in the circumferential direction C2 with respect to the straight portion 51, and the second projecting portion 53 is bent in the circumferential direction C1.
The first projecting portion 52 of the segment conductor 50 includes an inclined portion 52a formed in the circumferential direction C2 from the upper end of the straight portion 51 (the portion that protrudes from the slot 11), and the upper end surface 10a from the tip of the inclined portion 52a. And a vertical portion 52b formed in the vertical direction.
The second projecting portion 53 of the segment conductor 50 includes an inclined portion 53a formed by being bent toward the lower end surface 10b in the circumferential direction C1 from the lower end (the portion protruding from the slot 11) of the linear portion 51, and the inclined portion 53a. And a vertical portion 53b formed in the vertical direction with respect to the lower end surface 10b.

(Segment conductor 60)
FIG. 12 is a perspective view showing the segment conductor 60. As described in FIG. 5A, the segment conductor 60 is disposed in the slot 11 with the first surface 9 a perpendicular to the circumferential direction C.

The segment conductor 60 is formed by bending the rectangular wire 9 while keeping the first surface 9a perpendicular to the circumferential direction C (the first surface 9a is parallel to the radial direction R). The segment conductor 60 is formed in a state where the first surface 9a is kept parallel to the radial direction R.
The segment conductor 60 protrudes from the upper end surface 10a and the lower end surface 10b of the stator core 10 in a state where it is disposed in the slot 11 as shown in FIG. As shown in FIG. 12, the segment conductor 60 has a straight portion 61 disposed in the slot 11, a first protruding portion 62 protruding from the upper end surface 10a, and a second protruding portion 63 protruding from the lower end surface 10b. doing. With reference to the straight line portion 61, the first protrusion 62 is bent in the circumferential direction C1, and the second protrusion 63 is bent in the circumferential direction C2.

  The first projecting portion 62 of the segment conductor 60 has an inclined portion 62a formed in the circumferential direction C1 from the upper end of the straight portion 61 (the portion that protrudes from the slot 11), and the upper end surface 10a from the tip of the inclined portion 62a. A vertical portion 62b formed in the vertical direction, and a horizontal portion 62c extending from the tip of the vertical portion 62b in the inner circumferential direction (radially inner side R1) of the stator core 10 and parallel to the upper end surface 10a. have.

  The bent portion between the straight portion 61 and the inclined portion 62a and the bent portion between the inclined portion 62a and the vertical portion 62b are bent on the first surface 9a side of the flat wire 9, and the second surface 9b is on the same plane. Is retained. The bent portion between the vertical portion 62b and the horizontal portion 62c is bent on the second surface 9b side of the flat wire, and the first surface 9a is held on the same plane. When the segment conductor 60 is attached to the stator core 10, the flat wire 9 is bent about 90 degrees from the vertical portion 62b to the horizontal portion 62c. The direction in which the flat wire 9 is bent is a direction toward the radially inner side R1 when the segment conductor 60 is mounted on the stator core 10.

The second projecting portion 63 of the segment conductor 60 includes an inclined portion 63a formed in the circumferential direction C2 from the lower end of the straight portion 61 (the portion that protrudes from the slot 11), and the lower end surface 10b from the tip of the inclined portion 63a. A vertical portion 63b formed in the vertical direction, and a horizontal portion 63c formed extending from the tip of the vertical portion 63b in the inner peripheral direction of the stator core 10.
The bent portion between the straight portion 61 and the inclined portion 63a and the bent portion between the inclined portion 63a and the vertical portion 63b are bent on the first surface 9a side of the flat wire 9, and the second surface 9b is on the same plane. Is retained. The bent portion between the vertical portion 63b and the horizontal portion 63c is bent on the second surface 9b side of the flat wire, and the first surface 9a is held on the same plane. The flat wire 9 is bent about 90 degrees from the vertical portion 63b to the horizontal portion 63c. The direction in which the flat wire 9 is bent is a direction toward the radially inner side R1 when the segment conductor 60 is mounted on the stator core 10.

In the segment conductor 30 described above, the horizontal portions 32c and 33c are formed toward the radially outer side R2. In the segment conductor 60, the horizontal portions 62c and 63c are formed toward the radially inner side R1.
The vertical portion 52b of the segment conductor 50 and the horizontal portion 62c of the segment conductor 60 are joined at the joint portion 22c by TIG welding or the like, and the vertical portion 53b of the segment conductor 50 and the horizontal portion 63c of the segment conductor 60 are joined at the joint portion 22d. Each phase coil 21 is formed.

(Coil part set 24)
The coil portions 22 and 23 having the above-described configuration are arranged side by side in the radial direction R, whereby the coil portion set 24 of each phase is formed.
As shown in FIG. 6, the coil part 22U is arranged inside the coil part 23U to form a U-phase coil part set 24U. Moreover, the joining part 22c of the coil part 22U and the joining part 23c of the coil part 23U are arranged in the radial direction R, and the joining part 22d and the joining part 23d are also arranged in the radial direction R.

  As can be seen from FIG. 6, the first segment conductor 30 of the coil portion 22U and the first segment conductor 50 of the coil portion 23U are arranged in the same slot 11, and the second segment conductor 40 and the second segment conductor are arranged. 60 is arranged in the same slot 11. Similarly, the third segment conductor 30 and the segment conductor 50 are arranged in the same slot 11, and the fourth segment conductor 40 and the segment conductor 60 are arranged in the same slot 11. The fifth segment conductor 30 and the segment conductor 50 are arranged in the same slot 11, and the sixth segment conductor 40 and the segment conductor 60 are arranged in the same slot 11. The seventh segment conductor 30 and the segment conductor 50 are arranged in the same slot 11, and the eighth segment conductor 40 and the segment conductor 60 are arranged in the same slot 11.

  As will be described later, the segment conductors 30 and 40 of one U-phase coil portion 22U are arranged with the segment conductors 30 and 40 adjacent to each other in the circumferential direction C and five slots 11 therebetween (see FIG. 13 described later). reference). The segment conductors 50 and 60 of one U-phase coil portion 23U are arranged with the segment conductors 50 and 60 adjacent in the circumferential direction C and five slots 11 therebetween.

In the present embodiment, four such U-phase coil unit sets 24U are arranged to form a U-phase coil 21U.
In the coil 20 of the present embodiment, as shown in FIGS. 3 and 6, the end portion of the segment conductor 30 arranged on the innermost circumference is bent toward the radially outer side R2 and arranged on the outermost side. The end portion of the segment conductor 60 is bent inward in the radial direction.

(Combination of phase coil assembly 24)
FIG. 13 is a schematic view of a state in which one U-phase coil unit set 24U is mounted on the stator core 10 as viewed from the inner peripheral surface 10c side. Actually, two flat wires 9 are arranged in the depth direction of the drawing, but only one flat wire 9 is shown for easy understanding. In FIG. 13, in order to make the slot 11 easy to understand, the inner peripheral surface 10c is hatched.

The U-phase coil 21U is configured by combining four U-phase coil unit sets 24U. In order to distinguish each of the four U-phase coil unit sets 24U, the first U-phase coil unit set 24 (1) U, the second U-phase coil unit set 24 (2) U, and the third U-phase coil unit The set 24 (3) U and the fourth U-phase coil section set 24 (4) U are shown.
Since FIG. 13 is a view seen from the inner peripheral surface 10c side, the coil portion 23U is located on the back side of the coil portion 22U, and the configuration of the coil portion 22U (segment conductors 30 and 40, joint portion 22c, 22d), only the joining portion 23c is provided on the back side of the joining portion 22c, and the joining portion 23d is provided on the back side of the joining portion 22d. A segment conductor 50 is disposed on the back side of the segment conductor 30 in the drawing, and a segment conductor 60 is disposed on the back side of the segment conductor 40 in the drawing.

  Also for the segment conductors 30, 40, 50, 60, when describing the segment conductors 30, 40, 50, 60 of the first U-phase coil section set 24U, 30 (1), 40 (1), 50 (1) , 60 (1), and 30 (2), 40 (2), 50 (2), 60 (2) are similarly applied to the other U-phase coil sections 24 (2) 24 (3), 24 (4). ), 30 (3), 40 (3), 50 (3), 60 (3), 30 (4), 40 (4), 50 (4), 60 (4).

As shown in FIG. 13, in the U-phase coil section set 24 (1), the adjacent segment conductors 30 (1) and 40 (1) are arranged on the stator core 10 with five slots 11 therebetween. Yes.
FIG. 14 is a diagram illustrating a state in which the first U-phase coil unit set 24 (1) U and the second U-phase coil unit set 24 (2) U are attached to the stator core 10. FIG. 15 is a perspective view showing a state in which the first U-phase coil unit set 24 (1) and the second U-phase coil unit set 24 (2) are combined, and FIG. 16 shows the first U-phase coil unit. FIG. 3 is a perspective view showing a state in which a part set (1) and a second U-phase coil part set (2) are mounted on a stator core.

As shown in FIGS. 14 to 16, the second U-phase coil unit set 24 (2) is shifted by one slot 11 from the first U-phase coil unit set 24 (1) U in the circumferential direction C 2. It is arranged on the stator core 10.
In FIG. 14, the coil portion ends 22a and 22b of the U phase coil portion 22U of the first U phase coil portion set 24 (1) are defined as coil portion ends 22a (1) and 22b (1), and the second U phase coil. When the coil part ends 22a and 22b of the U-phase coil part 22U of the part set 24 (2) are coil part ends 22a (2) and 22b (2), the first U-phase coil part set 24 (1) shown in FIG. ) And the coil portion end 22a (2) of the second U-phase coil portion set 24 (2) are joined. As shown in FIGS. 15 and 16, the coil end 22a (1) and the coil end 22b (2)
Protrudes upward to connect with a crossover or the like. The same applies to the U-phase coil portion 23U.

FIG. 17 is a diagram showing a state in which four U-phase coil sections 24 are mounted on the stator core 10. The third U-phase coil unit set 24 (3) U and the fourth U-phase coil unit set 24 (4) are the first U-phase coil unit set 24 (1) U and the second U-phase coil unit set. 24 (4) is shown by a dotted line to distinguish it.
As shown in FIG. 17, the third U-phase coil unit set 24 (3) U is moved from the first U-phase coil unit set 24 (1) U by six slots 11 in the circumferential direction C. 10 is attached. The fourth U-phase coil unit set 24 (4) U is attached to the stator core 10 by moving six slots 11 in the circumferential direction C from the second U-phase coil unit set 24 (2).

  The segment conductors 40 and 60 of the first U-phase coil unit set 24 (1) U and the segment conductors 30 and 50 of the third U-phase coil unit set 24 (3) are arranged in the same slot 11. Yes. The segment conductors 30 and 50 of the first U-phase coil unit set 24 (1) U and the segment conductors 40 and 60 of the third U-phase coil unit set 24 (2) U are arranged in the same slot 11. ing.

  The segment conductors 40 and 60 of the second U-phase coil unit set 24 (2) U and the segment conductors 30 and 50 of the fourth U-phase coil unit set 24 (4) are arranged in the same slot 11. Yes. The segment conductors 30 and 50 of the second U-phase coil unit set 24 (2) U and the segment conductors 40 and 60 of the fourth U-phase coil unit set 24 (4) U are arranged in the same slot 11. ing.

The joint portion 22d (3) of the third U-phase coil portion set 24 (3) U is located below the stator core 10 of the joint portion 22c (1) of the first U-phase coil portion set 24 (1) U. Is arranged. The joint portion 22d (1) of the first U-phase coil portion set 24 (1) U is located below the stator core 10 of the joint portion 22c (3) of the third U-phase coil portion set 24 (3) U. Is arranged.
Next, the arrangement of the segment conductors 30, 40, 50, and 60 in the slot 11 of the first U-phase coil unit set 24 (1) U and the third U-phase coil unit set 24 (3) U will be described.

FIG. 18 is a view for explaining the arrangement of the segment conductors 30, 40, 50, 60 in the slot 11 of the first U-phase coil section set 24 (1) and the second U-phase coil section set 24 (2). FIG.
As shown in the leftmost slot 11 in FIG. 18, the segment conductor 30 (1) of the first U-phase coil unit set 24 (1), the third U-phase coil unit, from the inner peripheral surface 10c to the outer peripheral surface 10d. The segment conductor 40 (3) of the set 24 (3), the segment conductor 50 (1) of the first U-phase coil portion set 24 (1), the segment conductor 60 ( They are arranged in one slot 11 in the order of 3).
In the other slot 11, the segment conductor 30 (3), the segment conductor 40 (1), the segment conductor 50 (3), and the segment conductor 60 (1) are arranged in this order.

(Segment conductor joining)
The joint portion between the segment conductor 40 and the segment conductor 30 will be described in more detail. As shown in the enlarged view of the S portion in FIG. 7 and the enlarged view of the X portion in FIG. 18, the first surface 9a (indicated by P1 in parentheses in the drawing) of the horizontal portion 32c of the segment conductor 30 (1) and the segment conductor 40 The first surface 9a of the vertical portion 42b (shown as P2 in parentheses in the drawing) is in contact with and joined to each other. The rectangular wire 9 has two first surfaces 9a. Specifically, the segment to be joined to the first surface 9a of the vertical portion 42b on the slot 11 side where the segment conductor 30 to be joined is disposed. The first surface 9a of the horizontal portion 32c on the slot 11 side where the conductor 40 is disposed faces each other.

  As shown in FIG. 18, in the first U-phase coil section set 24U, the segment conductor 30 (1) is more in the radial direction R at a position in the slot 11 than the segment conductor 40 (1) joined thereto. Arranged inside. Since the horizontal portion 32c of the segment conductor 30 (1) extends outward, the first surface 9a of the horizontal portion 32c of the segment conductor 30 (1) and the segment as shown in the enlarged view of the X portion of FIG. The first surfaces 9a of the vertical portions 42b of the conductor 40 (1) can face each other and come into contact with each other.

  18, the first surface 9a of the horizontal portion 62c of the segment conductor 60 (indicated by P3 in parentheses in the drawing) and the first surface 9a of the vertical portion 52b of the segment conductor 50 (see FIG. 18). (Shown as P4 in curly brackets) are in contact with each other so as to face each other. The flat wire 9 has two first surfaces 9a. Specifically, the first surface 9a of the vertical portion 52b on the slot 11 side where the segment conductor 60 to be joined is disposed and the segment to be joined. The first surface 9a of the horizontal portion 62c on the slot 11 side where the conductor 50 is disposed faces each other.

  As shown in FIG. 18, in the first U-phase coil section set 24U, the segment conductor 60 (1) is more in the radial direction R at a position within the slot 11 than the segment conductor 50 (1) joined thereto. Arranged outside. Since the horizontal portion 62c of the segment conductor 60 (1) extends inward, the first surface 9a of the horizontal portion 62c of the segment conductor 60 (1) and the segment as shown in the enlarged view of the Y portion of FIG. The first surfaces 9a of the vertical portions 52b of the conductor 50 (1) can face each other and come into contact with each other.

As shown in FIG. 18, the first segment conductor 30 (1) and the second segment conductor 40 (1) from the inner side toward the outer peripheral surface 10d from the inner peripheral surface 10c of the stator core 10 are on the upper end side. It is joined. The third segment conductor 50 (1) from the inside and the fourth segment conductor 60 (1) from the inside are joined at the upper end side.
Thus, the segment conductors 30, 40, 50, 60 are arranged i-th from the inside of the slot 11 and i + 1 (i is 1 or more) from the inside in the other slot 11. It is joined with the segment conductor. Since the segment conductors 30, 40, 50, and 60 are arranged in this order from the inner side of the stator core 10 toward the radially outer side R 2, i is an odd number.

  FIG. 18 illustrates connection of segment conductors on the upper end face 10a side. On the other hand, although the connection state is not shown in FIG. 18, on the lower end surface 10b side, the segment conductor 40 (3) (see FIG. 18) and the segment conductor 30 (3 ) (See FIG. 18), the vertical surfaces 43b (see FIG. 9) and the horizontal portions 33c (see FIG. 10) are joined so that the first surfaces 9a face each other. Between the segment conductor 60 (3) (see FIG. 18) and the segment conductor 50 (3) (see FIG. 18) of the third U-phase coil section set (3) U, the first surfaces 9a face each other. Moreover, on the lower end surface 10b side, each vertical portion 53b (see FIG. 11) and the horizontal portion 63c (see FIG. 12) are joined.

The segment conductors 30, 40, 50, 60 of the second U-phase coil unit set 24 (2) U and the fourth U-phase coil unit set 24 (4) described above are also arranged in the same manner.
In the stator 2 of the present embodiment, the U-phase coil 21U having such a configuration and the V-phase coil 21V and the W-phase coil 21W having the same configuration as the U-phase coil 21U are mounted on the stator core 10.

(Arrangement of each phase coil 21)
FIG. 19 is a partial plan view for explaining a mounting state of each phase coil 21 to stator core 10. In FIG. 19, as an example, for the segment conductors 30, 40, 50, 60 of the first U-phase coil section set 24 (1) U, 30 (1) U, 40 (1) U, 50 (1) U, 60 (1) Shown as U. The same applies to the second, third, and fourth U-phase coil unit sets 24 (2) U, 23 (3) U, and 23 (4) U. For 30 (2) U, 40 (2) U, 50 (2) U, 60 (2) U, and third U-phase coil section set 24 (3) U, 30 (3) U, 40 ( 3) For U, 50 (3) U, 60 (3) U, and the fourth U-phase coil section set 24 (4) U, 30 (4) U, 40 (4) U, 50 (4) U, 60 (4) U.

  First to fourth W of the segment conductors 30, 40, 50, 60 of the first to fourth V-phase coil sections 24 (1) V to 24 (4) V of the V-phase coil 21V and the W-phase coil 21W. The same applies to the segment conductors 30, 40, 50, 60 of the phase coil assembly 24 (1) W to 24 (4) W. A symbol in which a point is arranged in a circle in the segment conductors 30, 40, 50, 60 indicates that a current flows from the back of the page toward the front, and an x is arranged in the circle. The symbol indicates that an electric current flows from the front side to the back side of the page.

  Describing from the slot 11A shown in FIG. 19 along the circumferential direction C1, the first slot 11A has a segment conductor 30 (3) of the third U-phase coil section set 24 (3) U from the inside to the outside. ) U, segment conductor 40 (1) U of first U-phase coil section set 24 (1) U, segment conductor 50 (3) U of third U-phase coil section set 24 (3) U, first The segment conductors 60 (1) U of the U-phase coil unit set 24 (1) U are arranged in order.

  In the second slot 11 in the circumferential direction C1 with the slot 11A as the first, from the inside toward the outside, the segment conductors 30 (4) U of the fourth U-phase coil section set 24 (4) U, the second U-phase coil section set 24 (2) U segment conductor 40 (2) U, fourth U-phase coil section set 24 (4) U segment conductor 50 (4) U, second U-phase coil section set 24 (2) U segment conductors 60 (2) U are arranged in order.

In the third slot 11, from the inside to the outside, the segment conductor 30 (3) V of the third V-phase coil section set 24 (3) V, the first V-phase coil section set 24 (1) V Segment conductor 40 (1) V, third V-phase coil section set 24 (3) V segment conductor 50 (3) V, first V-phase coil section set 24 (1) V segment conductor 60 (1 ) V are arranged in order.
In the fourth slot 11, from the inside to the outside, the segment conductor 30 (4) V of the fourth V-phase coil section set 24 (4) V, the second V-phase coil section set 24 (2) V Segment conductor 40 (2) V, fourth V-phase coil section set 24 (4) V segment conductor 50 (4) V, second V-phase coil section set 24 (2) V segment conductor 60 (2 ) V are arranged in order.

  In the fifth slot 11, from the inside toward the outside, the segment conductor 30 (3) W of the third W-phase coil portion set 24 (3) W, the first W-phase coil portion set 24 (1) W Segment conductor 40 (1) W, third W-phase coil section set 24 (3) W segment conductor 50 (3) W, first W-phase coil section set 24 (1) W segment conductor 60 (1 ) W are arranged in order. In the sixth slot 11, from the inside toward the outside, the segment conductor 30 (4) W of the fourth W-phase coil section set 24 (4) W, the second W-phase coil section set 24 (2) W Segment conductor 40 (2) W, fourth W-phase coil section set 24 (4) W segment conductor 50 (4) W, second W-phase coil section set 24 (2) W segment conductor 60 (2 ) W are arranged in order.

In the seventh slot 11, from the inner side toward the outer side, the segment conductor 30 (1) U of the first U-phase coil unit set 24 (1) U and the third U-phase coil unit set 24 (3) U Segment conductor 40 (3) U, first U-phase coil section set 24 (1) U segment conductor 50 (1) U, third U-phase coil section set 24 (3) U segment conductor 60 (3 ) U are arranged in order.
In the eighth slot 11, from the inner side toward the outer side, the segment conductor 30 (2) U of the second U-phase coil unit set 24 (2) U and the fourth U-phase coil unit set 24 (4) U Segment conductor 40 (4) U, second U-phase coil section set 24 (2) U segment conductor 50 (2) U, fourth U-phase coil section set 24 (4) U segment conductor 60 (4 ) U are arranged in order.

In the ninth slot 11, from the inside toward the outside, the segment conductor 30 (1) V of the first V-phase coil section set 24 (1) V and the third V-phase coil section set 24 (3) V Segment conductor 40 (3) V, first V-phase coil section set 24 (1) V segment conductor 50 (1) V, third V-phase coil section set 24 (3) V segment conductor 60 (3 ) V are arranged in order.
In the tenth slot 11, from the inside toward the outside, the segment conductor 30 (2) V of the second V-phase coil section set 24 (2) V, the fourth V-phase coil section set 24 (4) V Segment conductor 40 (4) V, second V-phase coil section set 24 (2) V segment conductor 50 (2) V, fourth V-phase coil section set 24 (4) V segment conductor 60 (4 ) V are arranged in order.

  In the eleventh slot 11, from the inside toward the outside, the segment conductor 30 (1) W of the first W-phase coil portion set 24 (1) W, the third W-phase coil portion set 24 (3) W Segment conductor 40 (3) W, first W-phase coil section set 24 (1) W segment conductor 50 (1) W, third W-phase coil section set 24 (3) W segment conductor 60 (3 ) W are arranged in order.

  In the twelfth slot 11, from the inside toward the outside, the segment conductor 30 (2) W of the second W-phase coil section set 24 (2) W and the fourth W-phase coil section set 24 (4) W Segment conductor 40 (4) W, second W-phase coil section set 24 (2) W segment conductor 50 (2) W, fourth W-phase coil section set 24 (4) W segment conductor 60 (4 ) W are arranged in order.

In the next thirteenth to twenty-fourth slots 11, the segment conductors 30, 40, 50, 60 of the respective phase coils 21 are arranged in the same manner as in the first to twelfth slots 11.
In the stator 2 of the present embodiment, the arrangement in the first to twelfth slots 11 is repeated four times in the circumferential direction C1, and the U-phase coil 21U, the V-phase coil 21V, and the W-phase are provided in the 48 slots 11. The stator 21 of this embodiment is configured by mounting the coil 21W.

  As shown in FIG. 19, in the first and second slots 11, a current flows from the back to the front, and in the third and fourth slots 11, a current flows from the front to the back. In this way, the direction of the current is switched every two slots 11 in the circumferential direction C. In addition, the coil part ends 22a, 22b, 23a, and 23b shown in FIGS. 7 and 8 are appropriately connected by crossovers or the like (not shown) so as to have such a current direction.

  As described above, in the stator 2 of the present embodiment, both end portions of the segment conductor 30 arranged on the innermost peripheral side of the slot 11 are bent toward the radially outer side R2. By this bending, a space D1 is formed inside the coil end as shown in the enlarged view of the G portion in FIG. 2, and the distance between the segment conductor 30 and the inner surface 5a of the housing 5 and the housing 5 can be secured. As a structure arrange | positioned at the housing 5, as shown to the G section enlarged view, it is the volt | bolt 94, the bearing part 6b, etc. FIG. Thereby, an insulating space can be secured. As described above, since the space D1 can be formed, an insulating space can be secured while reducing the size of the rotating electrical machine.

Moreover, in the stator 2 of this Embodiment, the both ends of the segment conductor 60 arrange | positioned at the outermost periphery side of the slot 11 are bent toward radial inside R1. By this bending, a space D2 is formed inside the coil end as shown in the enlarged view of the H part in FIG. 2, and a distance between the segment conductor 60 and the inner surface 5a of the housing 5 can be secured.
In the enlarged view of the G part and the enlarged view of the H part, the lower coil end in FIG. 2 is shown, but the space is secured by bending the segment conductor 30 and the segment conductor 60 even in the upper coil end.

<2. Manufacturing method>
Next, the manufacturing method of the stator 2 of this embodiment is demonstrated.
The manufacture of the stator of the present embodiment includes a segment conductor creation process for forming the segment conductors 30, 40, 50, 60, an arrangement process for arranging the segment conductors 30, 40, 50, 60 on the stator core 10, and a segment conductor 30. A welding step of welding between the segment conductors 40 and between the segment conductors 50 and 60.

(Segment conductor creation process)
FIG. 20 is a flowchart showing a method of creating the segment conductors 40 and 30 of the present embodiment. FIGS. 21A to 21C are diagrams for explaining a process of creating the segment conductor 30. FIG.
First, in order to form the segment conductors 30, 40, 50, 60, the flat wire 9 is cut at both ends so as to have a predetermined dimension (step S 1).

Next, the film | membrane of the edge part of the both ends of the segment conductors 30, 40, 50, 60 is peeled (step S2). This film peeling is performed by scraping off the film by punching using a mold. As a result, the peeling portions 30E, 40E, 50E, and 60E shown in FIGS. 7 and 8 are formed.
Subsequently, using the segment conductor 30, the tips of both end portions of the segment conductor 30 are bent 90 degrees in the same direction (step S3). In step S3, the flat wire 9 is bent with the first surface 9a kept on the same plane, and horizontal portions 32c and 33c are formed as shown in FIG. 21A (the J portion surrounded by the dotted line). reference). Further, the segment conductor 60 is also bent by 90 degrees in the same direction at both ends.

Next, the segment conductor 30 is formed in an S shape (step S4). In step S4, as shown in FIG. 21B, the first surface 9a is bent so that the second surface 9b of the flat wire 9 is held on the same plane (see the K portion surrounded by a dotted line).
Next, the segment conductor 30 is formed into an R shape so as to be curved along the circumferential direction C of the stator core 10 (step S5). In step S5, as shown in FIG. 21C, the inclined portion 32a and the inclined portion 33a of the segment conductor 30 are formed to be curved along the circumferential direction C of the stator core 10 (L surrounded by a dotted line). Section).

In step S <b> 5, the segment conductor 60 is molded so as to bend in the opposite direction to the segment conductor 30. The segment conductor 30 is curved along the circumferential direction C with the horizontal portion 32c facing the radially outer side R2, but the segment conductor 60 is circumferential with the horizontal portion 62c facing the radially inner side R1. Curve along C.
The segment conductors 40 and 50 are created in the same manner as the segment conductors 30 and 60 except that the step S3 is not performed.

(Arrangement process)
Next, the segment conductors 30, 40, 50, 60 are disposed in the slots 11 of the stator core 10. When the segment conductors 30, 40, 50, 60 are arranged in the slot 11, the segment conductors 30, 40, 50, 60 are opened from the inner peripheral surface 10 c of the stator core 10 to the opening 11 a of the slot 11 (see FIG. 4). Through the slot 11.
Specifically, the segment conductors 30, 40, 50, 60 are arranged on the inner side of the inner peripheral surface 10c of the stator core 10 and then moved toward the radially outer side R2, and the straight portions 31, The segment conductors 30, 40, 50, 60 are arranged in the slot 11 by inserting 41, 51, 61 into the slot 11.

(Welding process)
As shown in the welded portion Q1 in the enlarged Z portion of FIG. 16, the opposing portions of the vertical portion 42b of the segment conductor 40 and the horizontal portion 32c of the segment conductor 30 are TIG welded from above, and the segment conductor 40 and the segment conductor 30 Are joined. Similarly, the opposing part of the vertical part 43b of the segment conductor 40 and the horizontal part 33c of the segment conductor 30 is also welded.
As shown in the welded part Q2 in the enlarged view of the Z part in FIG. 16, the opposing parts of the vertical part 52b of the segment conductor 50 and the horizontal part 62c of the segment conductor 60 are TIG welded from above, and the segment conductor 50 and the segment conductor 60 Are joined. Similarly, the opposing part of the vertical part 53b of the segment conductor 50 and the horizontal part 63c of the segment conductor 60 is also welded.
Finally, a crossover line is provided as appropriate to manufacture the stator 2 of the present embodiment.

<3. Features>
(3-1)
The stator 2 of the present embodiment includes a stator core 10 and a coil 20. The stator core 10 is cylindrical and has a plurality of slots 11 formed along the radial direction on the inside thereof. The coil 20 has a plurality of segment conductors 30, 40, 50, 60 disposed in the slot 11, and is formed by joining the end portions of the segment conductors 30, 40, 50, 60. The segment conductors 30, 40, 50, 60 are rectangular in cross section, have a first surface 9a and a second surface 9b that is narrower than the first surface 9a, and the first surface 9a is parallel to the radial direction R. As shown in FIG. In each slot 11, a plurality of segment conductors 30, 40, 50, 60 are arranged so that the second surfaces 9b face each other. The plurality of segment conductors 30, 40, 50, 60 are joined at each end so that the first surfaces 9 a face each other. The segment conductors 30, 40, 50, 60 are linear portions 31, 41, 51, 61 (an example of a portion in the slot) disposed in the slot 11, and an upper end surface 10 a (first end surface) of both end surfaces of the stator core 10. 1st protrusion part 32,42,52,62 which protruded from 1 example), and 2nd protrusion part 33,43,53,63 which protruded from lower end surface 10b (an example of 2nd end surface) among both end surfaces. . The end portions are provided on both the first projecting portions 32, 42, 52, 62 and the second projecting portions 33, 43, 53, 63. The joined first surfaces 9a are provided on both the first projecting portions 32, 42, 52, and 62 side and the second projecting portions 33, 43, 53, and 63 side. The horizontal portions 32c and 33c (an example of an end portion) of the segment conductor 30 arranged on the innermost side of the slot 11 are arranged second from the inside in the other slots 11 so that the second surface 9b is curved. The vertical portions 42b and 43b (an example of the end portion) of the segment conductor 40 that are bent outward toward the vertical portions 42b and 43b (an example of the end portion) of the segment conductor 40 that are disposed second from the inside It is joined.

Thus, since the end portion of the segment conductor 30 arranged on the innermost peripheral side of the slot 11 is bent outward, a space D1 (see FIG. 2) can be secured inside the stator 2 by the amount of the bent portion. . Thereby, even if it is a case where size reduction of a rotary electric machine is aimed at, the insulation space can be ensured inside the stator 2. FIG.
Further, since the space D1 can be secured inside the stator 2, the size of the bearing portion 6b can be increased, and the reliability can be improved.

Moreover, since the segment conductors 30, 40, 50, and 60 are joined by the wide first surfaces 9a, sufficient joining strength can be ensured.
In order to obtain strength and conductivity, it is necessary to secure the same cross-sectional area as that of the segment conductor at the joint portion. However, since the wide first surfaces are opposed to each other, the joint depth is set to the second depth. The height of the coil end portion can be suppressed by securing the width of the surface.

(3-2)
In the stator 2 of the present embodiment, the horizontal portions 62c and 63c (an example of the end portion) of the segment conductor 60 disposed on the outermost side of the slot 11 are arranged so that the second surface 9b is curved. In FIG. 5, the vertical portion 52b of the segment conductor 50 arranged second from the outside is bent inwardly toward the vertical portions 52b and 53b (an example of the end portion) of the segment conductor 50 arranged second from the outside. , 53b (an example of an end).
Since the end portion of the segment conductor 60 arranged on the outermost side of the slot 11 is bent inward, a space can be secured on the outer side of the stator 2 by the amount of bending.
As a result, the space D2 (see FIG. 2) can be secured both inside and outside the stator 2, so that the rotating electrical machine can be downsized while securing the insulating space.

(3-3)
In the stator 2 of the present embodiment, the segment conductors 30 and 50 arranged i-th (i is an integer of 1 or more) from the inside of the stator core 10 are the segments arranged i + 1 in the other slots 11. The conductors 40, 60 and the first surface 9a are joined to each other so as to face each other. The joined first surfaces 9 a are formed in parallel with the radial direction R.
As a result, the segment conductors arranged in different slots 11 are joined together.

(3-4)
In the stator 2 of the present embodiment, four segment conductors 30, 40, 50, 60 are arranged in each slot 11.
Thereby, the stator 2 in which the four segment conductors 30, 40, 50, 60 are arranged in the slot 11 can be configured.

(3-5)
The rotating electrical machine 1 according to the present embodiment includes a stator 2 and a rotor 3 disposed inside the stator 2.
Thereby, the rotary electric machine which can ensure insulation space (space D1, D2) around and can achieve size reduction is realizable.

<Other embodiments>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention. In particular, a plurality of embodiments and modifications described in this specification can be arbitrarily combined as necessary.
(A)
In the above-described embodiment, the segment conductor 30 disposed on the innermost peripheral side is bent toward the radially outer side R2, and the segment conductor 60 disposed on the outermost peripheral side is bent toward the radially inner side R1. However, only one of them may be formed.
In the coil 20 ′ shown in FIG. 22A, the segment conductor arranged on the outermost periphery side is not bent inward. In the coil 20 ′ in FIG. 22, two U-phase coil portions 22 U are arranged in the radial direction R. For this reason, the segment conductor 30 arranged second from the outer peripheral side is bent toward the segment conductor 40 arranged closest to the outer peripheral side. In FIG. 22A, the U phase has been described, but the V phase and the W phase can be configured similarly.

Even in this case, since the space D1 (see FIG. 2) can be formed at least inside the stator 2, it is easy to secure the inner insulating space.
In contrast to the configuration of FIG. 22A, two U-phase coil portions 23 </ b> U may be arranged in the radial direction R as a coil 20 ″ shown in FIG. In this case, the segment conductor 60 arranged second from the inside is bent to the inside R1 in the radial direction and joined to the segment conductor 50 arranged on the innermost side. In FIG. 22B, the U phase has been described, but the V phase and the W phase can be configured similarly.
Even in this case, since the space D2 (see FIG. 2) can be formed at least outside the stator 2, it is easy to secure the outside insulating space.

(B)
In the above embodiment, the four segment conductors 30, 40, 50, 60 are arranged in one slot 11, but the number is not limited to four. For example, a combination of the segment conductor 30 and the segment conductor 40 or a combination of the segment conductor 50 and the segment conductor 60 between the segment conductor 40 arranged second from the inside and the segment conductor 50 arranged third from the inside. May be provided.

(C)
In the above embodiment, the rotating electrical machine 1 including the stator 2 is used for driving the swing machinery 100, but is not limited to the swing machinery 100. For example, it may be used as a drive motor for traveling the lower traveling body. In that case, the rotary electric machine 1 may be arrange | positioned so that the central axis A may become horizontal.

  INDUSTRIAL APPLICABILITY The stator of the present invention and the rotating electrical machine including the stator can easily secure an insulating space and can be reduced in size, and are useful as a swing machinery for a work vehicle, a driving motor for traveling, and the like.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 2 Stator 3 Rotor 4 Shaft 5 Housing 6a, 6b Bearing part 9 Flat wire 9a First surface 9b Second surface 10 Stator core 10a Upper end surface 10b Lower end surface 10c Inner peripheral surface 10d Outer peripheral surface 11 Slot 11a Opening portion 12 Teeth 20 20 ′, 20 ″ coil 21 phase coil 21U U phase coil 21V V phase coil 21W W phase coil 22, 23 coil part 22a, 22b, 23a, 23b coil part end 22c, 22d, 23c, 23d joint part 22U, 23U U-phase coil section 24 Coil section set 24U U-phase coil section set 24V V-phase coil section set 24W W-phase coil section set 30 Segment conductor (an example of i-th segment conductor)
31 Straight line part (example of part in slot)
32 1st protrusion part 32a Inclination part 32b Vertical part 32c Horizontal part (an example of an edge part)
33 Second protrusion 33a Inclined portion 33b Vertical portion 33c Horizontal portion (an example of an end portion)
40 segment conductor (example of i + 1th segment conductor)
41 Straight part (an example of the part in the slot)
42 1st protrusion part 42a Inclined part 42b Vertical part (an example of edge part)
43 2nd protrusion part 43a Inclined part 43b Vertical part (an example of edge part)
50 segment conductor (example of i-th segment conductor)
51 Straight line part (example of part in slot)
52 1st protrusion part 52a Inclined part 52b Vertical part (an example of an edge part)
53 2nd protrusion part 53a Inclined part 53b Vertical part (an example of an edge part)
60 segment conductor (example of i + 1th segment conductor)
61 Straight line part (example of part in slot)
62 1st protrusion part 62a Inclination part 62b Vertical part 62c Horizontal part (an example of an edge part)
63 2nd protrusion part 63a Inclined part 63b Vertical part 63c Horizontal part (an example of an edge part)
91 Cylindrical part 92 Ceiling part 93 Bottom part 100 Swing machinery

Claims (6)

A stator core which is cylindrical and has a plurality of slots formed along the radial direction on the inside thereof;
A plurality of segment conductors disposed in the slot, and a coil formed by joining ends of the segment conductors;
With
The segment conductor has a rectangular cross section, has a first surface and a second surface that is narrower than the first surface, and is disposed in the slot so that the first surface is parallel to the radial direction,
In each of the slots, a plurality of the segment conductors are arranged so that the second surfaces of each other face each other,
The plurality of segment conductors are joined at each end so that the first surfaces face each other,
The joined first surfaces facing each other are arranged in parallel with the radial direction,
The segment conductor includes an in-slot portion disposed in the slot, a first projecting portion projecting from a first end surface of both end surfaces of the stator core, and a second projecting projecting from a second end surface of the both end surfaces. And
The end is provided on both the first protrusion and the second protrusion,
The joined first surfaces facing each other are provided on both the first projecting portion side and the second projecting portion side,
The end of the segment conductor arranged at the innermost side of the slot faces the end of the segment conductor arranged second from the inside in the other slot so that the second surface is curved. Bent outward and joined to the end of the segment conductor arranged second from the inside,
Stator. The end of the segment conductor arranged on the outermost side of the slot faces the end of the segment conductor arranged second from the outside in the other slot so that the second surface is curved. Bent to the inside and joined to the end of the segment conductor arranged second from the outside,
The stator according to claim 1. A stator core which is cylindrical and has a plurality of slots formed along the radial direction on the inside thereof;
A plurality of segment conductors disposed in the slot, and a coil formed by joining ends of the segment conductors;
With
The segment conductor has a rectangular cross section, has a first surface and a second surface that is narrower than the first surface, and is disposed in the slot so that the first surface is parallel to the radial direction,
In each of the slots, a plurality of the segment conductors are arranged so that the second surfaces of each other face each other,
The plurality of segment conductors are joined at each end so that the first surfaces face each other,
The joined first surfaces facing each other are arranged in parallel with the radial direction,
The segment conductor includes an in-slot portion disposed in the slot, a first projecting portion projecting from a first end surface of both end surfaces of the stator core, and a second projecting projecting from a second end surface of the both end surfaces. And
The end is provided on both the first protrusion and the second protrusion,
The joined first surfaces facing each other are provided on both the first projecting portion side and the second projecting portion side,
The end of the segment conductor arranged on the outermost side of the slot faces the end of the segment conductor arranged second from the outside in the other slot so that the second surface is curved. Bent to the inside and joined to the end of the segment conductor arranged second from the outside,
Stator. The segment conductors arranged i-th (i is an integer equal to or greater than 1) from the inside of the slot are opposed to the segment conductors arranged i + 1-th in the other slots. So that they are joined at each end,
The stator according to any one of claims 1 to 3. Four segment conductors are disposed in each of the slots,
The stator according to any one of claims 1 to 4. The stator according to any one of claims 1 to 5,
A rotor disposed inside the stator;
Rotating electric machine with

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