JP2021093840A - Stator of rotary electric machine - Google Patents

Abstract

To provide a stator of a rotary electric machine which allows reduction of loss in a coil while enabling a higher output and higher torque of the rotary electric machine.SOLUTION: In each of a plurality of slots 22 on a stator 10 of a rotary electric machine, leg parts 41 of eight segment conductors 40 are inserted in a row in the radial direction. Oblique parts 43 of a first leg part 411 and a second leg part 412 obliquely extend in one same direction out of the circumferential directions, and oblique parts 43 of a third leg part 413 and a fourth leg part 414 obliquely extend in the opposite direction to the oblique parts 43 of the first leg part 411 and the second leg part 412. Oblique parts 43 of a fifth leg part 415 and a sixth leg part 416 obliquely extend in one same direction out of the circumferential directions, and oblique parts 43 of a seventh leg part 417 and an eighth leg part 418 obliquely extend in the opposite direction to the oblique parts 43 of the fifth leg part 415 and the sixth leg part 416.SELECTED DRAWING: Figure 10

Description

The present invention relates to a stator of a rotary electric machine, and more particularly to a stator of a rotary electric machine including a coil in which a plurality of segment conductors are inserted in each slot.

Conventionally, each of the U phase, V phase, and W phase composed of a plurality of segment conductors inserted in a row along the radial direction in each of the stator core and a plurality of slots formed along the circumferential direction of the stator core. Rotating machine stators with phase coils are known.

For example, in Patent Document 1, four layers of segment conductors are inserted in a row in a radial direction in a slot, and each of the U-phase, V-phase, and W-phase coils is configured by connecting two windings in parallel. A four-layer, two-parallel rotary electric machine stator is disclosed.

Further, for example, in Patent Document 2, eight layers of segment conductors are inserted in a row in a radial direction in a slot, and two windings of each of the U-phase, V-phase, and W-phase coils are connected in parallel. A stator of an 8-layer, 2-parallel rotary electric machine is disclosed.

Japanese Unexamined Patent Publication No. 2012-0293770 Japanese Unexamined Patent Publication No. 2015-023670

Since the number of segment conductors inserted into the slots of the stator of the 4-layer, 2-parallel rotary electric machine of Patent Document 1 is small, the aspect ratio represented by the radial thickness of the conductor portion of the segment conductor / the circumferential width of the conductor portion. The ratio can be easily increased. When the aspect ratio is increased, a larger current can be passed through the segment conductor, and while high output and high torque can be achieved, the eddy current loss generated in the segment conductor increases, so the loss in the coil increases. There was a challenge.

The stator of the 8-layer 2-parallel rotary electric machine of Patent Document 2 has a smaller eddy current loss generated in the segment conductor than the stator of the 4-layer 2-parallel rotary electric machine of Patent Document 1. However, since the number of segment conductors inserted into the slots is large, there is a problem that the aspect ratio of the segment conductors is small, a large current cannot flow through the segment conductors, and it is difficult to increase the output and torque.

The present invention provides a stator of a rotary electric machine capable of reducing loss in a coil while achieving high output and high torque of the rotary electric machine.

The present invention
A substantially annular stator core having a plurality of teeth protruding inward in the radial direction at predetermined intervals along the circumferential direction and a plurality of slots that are spaces between the teeth adjacent to each other in the circumferential direction.
A coil having a plurality of segment conductors inserted into each of the plurality of slots.
Each said segment conductor
It has legs that are located inside the slot and extend substantially linearly in the axial direction.
One end of the leg in the axial direction protrudes outward from one end surface in the axial direction of the stator core, and extends obliquely in the first or second direction in the circumferential direction, and the skew portion. A tip portion extending outward in the axial direction from the tip end of the portion is formed.
Each of the plurality of slots is a stator of a rotary electric machine in which the legs of eight segment conductors are inserted in a radial direction.
Seen from the one end surface side in the axial direction of the stator core
The legs of the eight segment conductors inserted in the slots in a row in the radial direction are the first leg portion arranged in the first layer and the second leg portion arranged in the second layer, counting from the inside in the radial direction. Legs, 3rd legs arranged in the 3rd layer, 4th legs arranged in the 4th layer, 5th legs arranged in the 5th layer, 6th legs arranged in the 6th layer , Has a 7th leg arranged in the 7th layer and an 8th leg arranged in the 8th layer.
The oblique portion of the first leg portion and the second leg portion is oblique in the same direction of either the first direction or the second direction in the circumferential direction.
The oblique portion of the third leg portion and the fourth leg portion is the oblique portion of the first leg portion and the second leg portion of the first direction and the second direction in the circumferential direction. It is skewed in the opposite direction to
The oblique portion of the fifth leg portion and the sixth leg portion is oblique in the same direction of either the first direction or the second direction in the circumferential direction.
The oblique portion of the 7th leg portion and the 8th leg portion is oblique in the circumferential direction to the side opposite to the oblique portion of the 5th leg portion and the 6th leg portion.

According to the present invention, eight segment conductors are inserted into the slots in a radial direction when viewed from one end surface side in the axial direction of the stator core, so that the eddy current loss generated in the segment conductors can be reduced. The loss in the coil can be reduced. Further, the oblique portions of the first leg portion and the second leg portion are oblique in the same direction of either the first direction or the second direction in the circumferential direction, and the third leg portion and the second leg portion are oblique. The oblique portion of the four legs is oblique in the circumferential direction in the direction opposite to the oblique portion of the first leg and the second leg among the first and second directions, and the fifth leg is And the oblique portion of the 6th leg is oblique in the same direction of either the 1st direction or the 2nd direction in the circumferential direction, and the oblique portion of the 7th leg and the 8th leg is oblique. The portions are oblique in the circumferential direction to the opposite side of the oblique portions of the 5th and 6th legs, so that the 1st and 2nd legs and the 3rd and 4th legs are oblique. , The fifth leg and the sixth leg, and the seventh leg and the eighth leg allow the windings connected in parallel to be easily configured. As a result, eight layers of segment conductor legs are inserted in a row in the radial direction in each slot, and four windings for each of the U-phase, V-phase, and W-phase are connected in parallel. Since the rotary electric machine can be easily configured, a large current can be passed through the coils of each phase, and high output and high torque can be achieved.

It is a figure which looked at the stator of the rotary electric machine of one Embodiment of this invention from the outside in the radial direction. It is sectional drawing which saw the stator of the rotary electric machine of FIG. 1 from the axial direction. It is a perspective view of the segment conductor of the stator of the rotary electric machine of FIG. It is an enlarged view around the slot of FIG. It is a perspective view of the stator of the rotary electric machine of FIG. 1 seen from the first end surface side of the stator core. It is a figure which looked at the segment conductor, the 1st clamper and the 2nd clamper at the time of forming the 1st joint part and the 2nd joint part of the stator of the rotary electric machine of FIG. 1 from the axial direction. It is an enlarged perspective view of the periphery of the 1st joint part and the 2nd joint part of the stator of the rotary electric machine of FIG. It is the figure which looked at the stator of the rotary electric machine of FIG. 1 in the axial direction from the 1st end surface side of the stator core. It is a schematic diagram which shows the structure of the coil of the stator of the rotary electric machine of FIG. It is a developed view which shows the structure of the V-phase coil of the stator of the rotary electric machine of FIG. It is a developed view which shows the structure of each phase coil of the U-phase, V-phase, and W-phase of the stator of the rotary electric machine of FIG. It is a graph which shows the relationship between the aspect ratio of the segment conductor of the stator of the rotary electric machine of FIG. 1 and the coil loss.

Hereinafter, an embodiment of the stator of the rotary electric machine of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the stator 10 of the rotary electric machine of the present embodiment includes a substantially ring-shaped stator core 20 and a coil 30 assembled to the stator core 20.

In the present specification and the like, for the sake of simplicity and clarification, the axial direction, the radial direction, and the circumferential direction refer to the directions with reference to the central axis CL of the stator 10 and the stator core 20. Further, the inner side in the axial direction means the central side of the stator 10 in the axial direction, and the outer side in the axial direction means the side away from the center of the stator 10 in the axial direction.

The stator core 20 has a substantially annular shape, and includes a plurality of teeth 21 protruding inward in the radial direction at predetermined intervals along the circumferential direction, and a plurality of slots 22 which are spaces between the adjacent teeth 21 in the circumferential direction. , Equipped with. In this embodiment, the stator core 20 has 48 teeth 21 and 48 slots 22 are formed. The stator core 20 is formed as a laminated core formed by laminating a plurality of electromagnetic steel plates having a predetermined thickness in the axial direction. The stator core 20 has a first end surface 201 and a second end surface 202 in the axial direction.

The coil 30 is assembled to the stator core 20 and has a first coil end portion 31 protruding outward in the axial direction from the first end surface 201 of the stator core 20 and a second coil protruding outward in the axial direction from the second end surface 202 of the stator core 20. The end portion 32 and the end portion 32 are formed.

The coil 30 has a plurality of segment conductors 40 inserted into each of the 48 slots 22.

As shown in FIG. 3, the segment conductor 40 is provided with an insulating coating portion 402 on a conductor portion 401 having a substantially rectangular cross section. The segment conductor 40 extends in parallel with each other, and has a pair of leg portions 41 having a first end portion 41a and a second end portion 41b, and a curved portion 42 connecting the second end portions 41b of the pair of leg portions 41. It has a substantially U-shape. In the segment conductor 40, a pair of leg portions 41 are inserted into different slots 22 of the stator core 20, and the curved portion 42 protrudes outward in the axial direction from the second end surface 202 of the stator core 20, and the first of the pair of leg portions 41. The end portion 41a is arranged so as to project outward in the axial direction from the first end surface 201 of the stator core 20.

Then, in the protruding portion of the pair of leg portions 41 protruding outward in the axial direction from the first end surface 201 of the stator core 20, a jig (not shown) holds the tip portion of the first end portion 41a with respect to the stator core 20. The stator core 20 is bent in the circumferential direction by relatively rotating in the circumferential direction while approaching in the axial direction. As a result, the protruding portion of the first end portion 41a of the pair of leg portions 41 is held by the jig and the oblique portion 43 that bends and extends in the circumferential direction of the stator core 20 in the direction toward each other or in the direction away from each other. A tip portion 44 which is a tip portion of the first end portion 41a and extends outward in the axial direction of the stator core 20 from the tip of the skew portion 43 is formed.

In the segment conductor 40 formed in this way, the lap-wound segment conductor 40A in which the oblique portion 43 bends and extends in the circumferential direction of the stator core 20 in a direction approaching each other, and the oblique portion 43 moves away from each other in the stator core 20. It has a wave-wound segment conductor 40B that bends and extends in a direction.

As shown in FIGS. 4 and 5, eight layers of leg portions 41 of the segment conductors 40 are inserted in each slot 22 of the stator core 20 in a line in the radial direction. That is, in each slot 22 of the stator core 20, the first leg portion 411 arranged in the first layer, the second leg portion 412 arranged in the second layer, and the third leg portion 412 arranged in the second layer are arranged in each slot 22 in the radial direction. 3rd leg 413, 4th leg 414 arranged in the 4th layer, 5th leg 415 arranged in the 5th layer, 6th leg 416 arranged in the 6th layer, 7th layer The arranged 7th leg portion 417 and the 8th leg portion 418 arranged in the 8th layer are inserted.

When viewed from the first end surface 201 side of the stator core 20, among the eight-layer leg portions 41 inserted into each slot 22 of the stator core 20, the oblique portion 43 of the first leg portion 411 and the second leg portion 412 is peripheral. It is skewed counterclockwise in the direction. The oblique portion 43 of the third leg portion 413 and the fourth leg portion 414 is oblique clockwise in the circumferential direction. The slanted portions 43 of the fifth leg portion 415 and the sixth leg portion 416 are slanted clockwise in the circumferential direction. The oblique portion 43 of the seventh leg portion 417 and the eighth leg portion 418 is oblique in the circumferential direction in a counterclockwise direction.

As described above, the oblique portions 43 of the first leg portions 411 to the eighth leg portions 418 have the same circumferential oblique direction for each of the two layers. Therefore, the first jig that holds the tip end portion of the first end portion 41a of the first leg portion 411 and the second jig that holds the tip end portion of the first end portion 41a of the second leg portion 412 are 1 With one drive source, the stator core 20 can be relatively rotated counterclockwise while approaching the stator core 20 in the axial direction. Similarly, a third jig that holds the tip end portion of the first end portion 41a of the third leg portion 413 and a fourth jig that holds the tip end portion of the first end portion 41a of the fourth leg portion 414 are used. With one drive source, the stator core 20 can be relatively rotated clockwise while approaching the stator core 20 in the axial direction. One drive source is a fifth jig that holds the tip of the first end 41a of the fifth leg 415 and a sixth jig that holds the tip of the first end 41a of the sixth leg 416. It can be rotated relative to the stator core 20 so as to be clockwise in the circumferential direction while approaching in the axial direction. One drive source is a seventh jig that holds the tip of the first end 41a of the seventh leg 417 and an eighth jig that holds the tip of the first end 41a of the eighth leg 418. It can be relatively rotated so as to be counterclockwise in the circumferential direction while approaching the stator core 20 in the axial direction.

As a result, the number of drive sources (4 in the present embodiment) that is half of the number of legs 41 (8 in the present embodiment) of the segment conductor 40 inserted into each slot 22 is used as the drive source, and the first leg portions 411 to Since the slanted portion 43 of the eighth leg portion 418 can be formed, the manufacturing apparatus for forming the slanted portion 43 of the first leg portion 411 to the eighth leg portion 418 can be simplified, and the manufacturing cost of the stator 10 can be reduced. In the present embodiment, the third jig and the fourth jig, and the fifth jig and the sixth jig both rotate relative to the stator core 20 so as to be clockwise in the circumferential direction. The third jig to the sixth jig may be driven by one drive source. In this case, since the oblique portion 43 of the first leg portion 411 to the eighth leg portion 418 can be formed by the three drive sources, the manufacturing cost of the stator 10 can be further reduced.

When viewed from the first end surface 201 side of the stator core 20, the tip portion 44 extending axially outward from the tip ends of the oblique portion 43 of the first leg portion 411 and the second leg portion 412 inserted into the slot 22, and the seventh leg. The tip portion 44 extending axially outward from the tip of the oblique portion 43 of the portions 417 and the eighth leg portion 418, and the third leg portion 413 and the fourth leg portion inserted into the sixth slot 22 counterclockwise. The tip portion 44 extending axially outward from the tip of the oblique portion 43 of the 414, and the tip portion 44 extending axially outward from the tip of the oblique portion 43 of the fifth leg portion 415 and the sixth leg portion 416 have diameters. From the inside in the direction, the tip 44 of the first leg 411, the tip 44 of the second leg 412, the tip 44 of the third leg 413, the tip 44 of the fourth leg 414, and the fifth leg 415. 44, the tip 44 of the 6th leg 416, the tip 44 of the 7th leg 417, and the tip 44 of the 8th leg 418 are arranged in a row in the radial direction.

Next, as shown in FIG. 6, the tip ends 44 of the first leg portions 411 to the eighth leg portions 418 arranged in a row in the radial direction are counterclockwise in the circumferential direction when viewed from the first end surface 201 side of the stator core 20. It is sandwiched between the first clamper 91 arranged on the clockwise side and the second clamper 92 arranged on the clockwise side in the circumferential direction.

The first clamper 91 is located on the radial outer side of the first side surface 911 extending in the radial direction and the radial outside of the first side surface 911 when viewed from the first end surface 201 side of the stator core 20, and is substantially on the same straight line as the first side surface 911. The second side surface 912 extending in the radial direction, the third side surface 913 extending in the circumferential direction so as to face the inner side surface in the radial direction of the tip portion 44 of the first leg portion 411, and the tip portion 44 of the eighth leg portion 418. It was formed between the fourth side surface 914 extending in the circumferential direction so as to face the radial outer side surface, the radial outer end portion 911a of the first side surface 911, and the radial inner end portion 912b of the second side surface 912. It has a wedge portion 915 and.

The wedge portion 915 projects clockwise from the first side surface 911 and the second side surface 912 in the circumferential direction. The wedge portion 915 has a first inclined surface 915a that is inclined outward in the radial direction from the radial outer end portion 911a of the first side surface 911 and extends clockwise in the circumferential direction, and a radial inner end portion 912b of the second side surface 912. A second inclined surface 915b that is inclined inward in the radial direction and extends clockwise in the circumferential direction is provided.

The second clamper 92 is located on the radially outer side of the first side surface 921 extending in the radial direction and the first side surface 921 when viewed from the first end surface 201 side of the stator core 20, and is substantially on the same straight line as the first side surface 921. The second side surface 922 extending in the radial direction, the third side surface 923 extending in the circumferential direction so as to face the inner side surface in the radial direction of the tip portion 44 of the first leg portion 411, and the tip portion 44 of the eighth leg portion 418. It was formed between a fourth side surface 924 extending in the circumferential direction so as to face the radial outer side surface, and a radial outer end portion 921a of the first side surface 921 and a radial inner end portion 922b of the second side surface 922. It has a wedge portion 925 and.

The wedge portion 925 protrudes counterclockwise from the first side surface 921 and the second side surface 922 in the circumferential direction. The wedge portion 925 has a first inclined surface 925a that is inclined outward in the radial direction from the radial outer end portion 921a of the first side surface 921 and extends clockwise in the circumferential direction, and a radial inner end portion 922b of the second side surface 922. A second inclined surface 925b that is inclined inward in the radial direction and extends clockwise in the circumferential direction is provided.

The first clamper 91 and the second clamper 92 have a shape that is symmetrical in the circumferential direction, that is, linearly symmetric with respect to the radial direction when viewed from the first end surface 201 side of the stator core 20.

The first clamper 91 and the second clamper 92 are sandwiched between the tip portions 44 of the first leg portions 411 to the eighth leg portions 418 arranged in a radial direction.

At this time, when viewed from the first end surface 201 side of the stator core 20, the first side surface 911 of the first clamper 91 is the circumference of the tip portion 44 of the first leg portions 411 to the fourth leg portions 414 arranged in a radial direction. Facing the side surface on the counterclockwise side in the direction, the first side surface 921 of the second clamper 92 is clockwise in the circumferential direction of the tip portion 44 of the first leg portions 411 to the fourth leg portions 414 arranged in a radial direction. Facing the side surface on the rotating side. The second side surface 912 of the first clamper 91 faces the side surface on the counterclockwise side in the circumferential direction of the tip portion 44 of the fifth leg portions 415 to the eighth leg portions 418 arranged in a radial direction, and the second clamper The second side surface 922 of 92 faces the side surface on the clockwise side in the circumferential direction of the tip end portion 44 of the fifth leg portions 415 to the eighth leg portions 418 arranged in a radial direction. The wedge portion 915 of the first clamper 91 and the wedge portion 925 of the second clamper 92 are located between the tip portion 44 of the fourth leg portion 414 and the tip portion 44 of the fifth leg portion 415 in the radial direction, and have a circumference. They are facing each other in the direction. The third side surface 913 of the first clamper 91 and the third side surface 923 of the second clamper 92 extend in the circumferential direction on substantially the same straight line and abut on the inner side surface in the radial direction of the tip portion 44 of the first leg portion 411. Or in close proximity. The fourth side surface 914 of the first clamper 91 and the fourth side surface 924 of the second clamper 92 extend in the circumferential direction on substantially the same straight line and abut on the outer side surface in the radial direction of the tip portion 44 of the eighth leg portion 418. Or in close proximity.

Then, the first clamper 91 and the second clamper 92 are moved so as to approach each other in the circumferential direction.

Then, the tip portion 44 of the fourth leg portion 414 comes into contact with the first inclined surface 915a of the wedge portion 915 of the first clamper 91 and the first inclined surface 925a of the wedge portion 925 of the second clamper 92. Further, the tip portion 44 of the fifth leg portion 415 abuts on the second inclined surface 915b of the wedge portion 915 of the first clamper 91 and the second inclined surface 925b of the wedge portion 925 of the second clamper 92.

Then, the first clamper 91 and the second clamper 92 are moved so as to be closer to each other in the circumferential direction.

Then, the first inclined surface 915a of the wedge portion 915 of the first clamper 91 and the first inclined surface 925a of the wedge portion 925 of the second clamper 92 press the tip portion 44 of the fourth leg portion 414 inward in the radial direction. As a result, as the first clamper 91 and the second clamper 92 approach each other, the tip portion 44 of the fourth leg portion 414 becomes the wedge of the first inclined surface 915a of the wedge portion 915 of the first clamper 91 and the wedge portion 92 of the second clamper 92. It bends and deforms so as to incline inward in the radial direction along the first inclined surface 925a of the portion 925. Then, as the tip 44 of the fourth leg 414 bends and deforms so as to incline inward in the radial direction, the tip 44 of the third leg 413 is pressed inward in the radial direction, and the third leg 413 is pressed. The tip portion 44 of the head is bent and deformed so as to be inclined inward in the radial direction. Further, as the tip 44 of the third leg 413 bends and deforms so as to incline inward in the radial direction, the tip 44 of the second leg 412 is pressed inward in the radial direction, and the second leg 412 The tip portion 44 of the is bent and deformed so as to be inclined inward in the radial direction. Since the tip 44 of the first leg 411 is in contact with or close to the third side surface 913 of the first clamper 91 and the third side surface 923 of the second clamper 92, the tip 44 of the second leg 412 is in contact with or close to the third side surface 913 of the first clamper 91. Even if the tip 44 of the first leg 411 is bent and deformed so as to be inclined inward in the radial direction and the tip 44 of the first leg 411 is pressed, the tip 44 of the first leg 411 is substantially not bent and deformed and extends substantially parallel to the axial direction. (See Fig. 7). Then, the tip ends 44 of the first leg portions 411 to the fourth leg portions 414 are held by the first clamper 91 and the second clamper 92 in a state where the adjacent tip portions 44 are in contact with each other.

At the same time, the second inclined surface 915b of the wedge portion 915 of the first clamper 91 and the second inclined surface 925b of the wedge portion 925 of the second clamper 92 press the tip portion 44 of the fifth leg portion 415 radially outward. As a result, as the first clamper 91 and the second clamper 92 approach each other, the tip portion 44 of the fifth leg portion 415 becomes the second inclined surface 915b of the wedge portion 915 of the first clamper 91 and the wedge of the second clamper 92. Along the second inclined surface 925b of the portion 925, the portion 925 is bent and deformed so as to be inclined outward in the radial direction. Then, as the tip portion 44 of the fifth leg portion 415 bends and deforms so as to incline outward in the radial direction, the tip portion 44 of the sixth leg portion 416 is pressed outward in the radial direction, and the sixth leg portion 416 The tip portion 44 of the is bent and deformed so as to be inclined outward in the radial direction. Further, as the tip portion 44 of the sixth leg portion 416 bends and deforms so as to incline outward in the radial direction, the tip portion 44 of the seventh leg portion 417 is pressed radially outward, and the seventh leg portion 417. The tip portion 44 of the is bent and deformed so as to be inclined outward in the radial direction. Since the tip 44 of the eighth leg 418 is in contact with or close to the fourth side surface 914 of the first clamper 91 and the fourth side surface 924 of the second clamper 92, the tip 44 of the seventh leg 417 is in contact with or close to the fourth side surface 914 of the first clamper 91. Even if the tip portion 44 of the eighth leg portion 418 is bent and deformed so as to be inclined outward in the radial direction and the tip portion 44 of the eighth leg portion 418 is pressed, the tip portion 44 of the eighth leg portion 418 is substantially not bent and deformed and extends substantially parallel to the axial direction. (See Fig. 7). Then, the tip portions 44 of the fifth leg portions 415 to the eighth leg portions 418 are held by the first clamper 91 and the second clamper 92 in a state where the adjacent tip portions 44 are in contact with each other.

Then, the first clamper 91 and the second clamper 92 abut the adjacent tip portions 44 of the tip portions 44 of the first leg portions 411 to the fourth leg portions 414, and the fifth leg portions 415 to the eighth leg portions 418 come into contact with each other. With the adjacent tip 44 of the tip 44 in contact, for example, by laser welding, the tip 44 of the first leg 411, the tip 44 of the second leg 412, and the tip 44 of the second leg 412 are in contact with each other. And the tip 44 of the third leg 413, and the tip 44 of the third leg 413 and the tip 44 of the fourth leg 414 are joined, and the tip 44 and the sixth leg 416 of the fifth leg 415 are joined. 44, the tip 44 of the sixth leg 416 and the tip 44 of the seventh leg 417, and the tip 44 of the seventh leg 417 and the tip 44 of the eighth leg 418 are joined. As a result, four tip portions 44 of the first leg portions 411 to the fourth leg portions 414 are integrally joined to form a conductive first joint portion 451, and the tips of the fifth leg portions 415 to the eighth leg portions 418 are formed. The second joint portion 452 is formed by joining the four portions 44 together to form a conductive portion.

In this way, when viewed from the first end surface 201 side of the stator core 20, the tip portions 44 of the first leg portion 411 and the second leg portion 412 inserted into the slot 22 and the sixth slot 22 counterclockwise The inserted third leg 413 and the tip 44 of the fourth leg 414 are arranged in a radial direction, and the tip 44 of the seventh leg 417 and the eighth leg 418 inserted into the slot 22. And, since the third leg portion 413 and the tip portion 44 of the fourth leg portion 414 inserted into the sixth slot 22 in a counterclockwise direction are lined up in a radial direction, the first clamper having a simple shape is used. Using the 91 and the second clamper 92, the tip 44 of the first leg 411 and the second leg 412 inserted into the slot 22, and the third leg inserted into the sixth slot 22 counterclockwise. The tip portion 44 of the portion 413 and the fourth leg portion 414 can be easily joined, and the tip portion 44 of the seventh leg portion 417 and the eighth leg portion 418 inserted into the slot 22 and the tip portion 44 counterclockwise 6 The third leg portion 413 and the tip portion 44 of the fourth leg portion 414 inserted into the second slot 22 can be easily joined. Thereby, the first joint portion 451 and the second joint portion 452 can be easily formed.

The first leg portion 411 and the tip portion 44 of the second leg portion 412 inserted into a part of the slots 22 are joined to each other, but the third leg portion 413 and the fourth leg portion 413 and the fourth are inserted into different slots 22. It is not joined to the tip portion 44 of the leg portion 414. Similarly, the tip 44 of the third leg 413 and the fourth leg 414 inserted into some slots 22 are joined to each other, but the first leg 411 and the first leg 411 inserted into different slots 22. It is not joined to the tip portion 44 of the two leg portions 412. Further, the fifth leg portion 415 and the tip portion 44 of the sixth leg portion 416 inserted into a part of the slots 22 are joined to each other, but the seventh leg portion 417 and the eighth leg portion 417 and the eighth leg are inserted into different slots 22. It is not joined to the tip portion 44 of the leg portion 418. Similarly, the tip 44 of the seventh leg 417 and the eighth leg 418 inserted in some slots 22 are joined to each other, but the fifth leg 415 and the fifth leg inserted in different slots 22. It is not joined to the tip portion 44 of the 6-leg portion 416. The details will be described later.

In this way, the coil 30 is composed of a plurality of segment conductors 40 inserted into each of the 48 slots 22. Then, the oblique portion 43 and the tip portion 44 of each segment conductor 40 form the first coil end portion 31 of the coil 30, and the curved portion 42 of each segment conductor 40 forms the second coil end portion 32 of the coil 30. Configure.

Therefore, the stator 10 of the present embodiment has the tip ends 44 of the first leg 411 and the second leg 412 inserted in the slot 22, and the third leg 413 and the fourth leg inserted in different slots 22. The first joint 451 to which the tip 44 of the 414 is joined, the tip 44 of the fifth leg 415 and the sixth leg 416 inserted into the slot 22, and the seventh inserted into a different slot 22. It has a second joint portion 452, to which the leg portion 417 and the tip portion 44 of the eighth leg portion 418 are joined. That is, in the stator 10 of the present embodiment, eight legs inserted into one slot 22 by joining four tip portions 44 of leg portions 41 having eight layers inserted in a row into each slot 22 of the stator core 20. It has two joints (first joint 451 and second joint 452) with respect to the portion 41.

In the conventional stator, when eight layers of segment conductor legs are arranged in a radial direction in each slot of the stator core to form a coil, the tip of the first leg and the second slot inserted in different slots. The second joint and the fifth leg, in which the tips of the first and third legs to which the tips of the legs are joined and the tips of the fourth legs inserted in different slots are joined. The tip of the third and seventh legs, where the tip of the portion and the tip of the sixth leg inserted in different slots are joined, and the tip of the eighth leg inserted in different slots. It had a fourth joint to which the parts were joined. Therefore, in the conventional stator, two tips of the legs inserted in a row in eight layers are joined to each slot of the stator core, and four joints are joined to the eight legs inserted into one slot. Had.

Therefore, in the conventional stator, since four joints are arranged in the radial direction, it is difficult to increase the radial distance between the four joints, and it is difficult to increase the partial discharge start voltage of the coil. there were.

On the other hand, in the present embodiment, since there are two joints arranged in the radial direction, the first joint portion 451 and the second joint portion 452, it is possible to increase the radial distance between the joint portions. Therefore, it is possible to increase the partial discharge start voltage of the coil 30.

Further, in order to manufacture the conventional stator, the first clamper 91 and the second clamper 92 are provided with a fourth leg between the tip of the second leg and the tip of the third leg in the radial direction. Since it is necessary to provide a wedge portion between the tip portion of the portion and the tip portion of the fifth leg portion and between the tip portion of the sixth leg portion and the tip portion of the seventh leg portion, the first clamper 91 and It was necessary to provide a total of six wedges, three for each of the second clampers 92. Further, in order to provide three wedge portions in each of the first clamper 91 and the second clamper 92, it is necessary to reduce the size of one wedge portion.

On the other hand, in the present embodiment, four tip portions 44 of the first leg portion 411 to the fourth leg portion 414 are integrally joined, and four tip portions 44 of the fifth leg portion 415 to the eighth leg portion 418 are joined. Since they are integrally joined, the first clamper 91 and the second clamper 92 are provided with wedge portions 915 and 925 only between the tip portion of the fourth leg portion and the tip portion of the fifth leg portion in the radial direction. A total of two wedge portions 915 and 925 may be provided, one for each of the first clamper 91 and the second clamper 92. As a result, the shapes of the first clamper 91 and the second clamper 92 can be simplified, so that the manufacturing cost of the stator 10 can be reduced. Further, since it is sufficient to form one wedge portion 915 and 925, respectively, for the first clamper 91 and the second clamper 92, the wedge portions 915 and 925 can be enlarged. As a result, the rigidity of the first clamper 91 and the second clamper 92 can be increased, so that the manufacturing cost of the stator 10 can be reduced.

Further, as shown in FIG. 7, the tip portions 44 of the second leg portions 421 to the fourth leg portion 414 are bent so as to be inclined inward in the radial direction, and the tip portions of the fifth leg portion 415 to the seventh leg portion 417 are bent. Since the 44 is bent so as to be inclined outward in the radial direction, the distance between the tip portion 44 of the fourth leg portion 414 and the tip portion 44 of the fifth leg portion 415 in the radial direction becomes large. As a result, the partial discharge start voltage of the coil 30 becomes high, and the occurrence of partial discharge in the coil 30 can be suppressed, so that the coil 30 can be driven with a larger electric power, and the output performance of the rotary electric machine is improved. To do.

Further, when the tip 44 of the second leg 421 to the fourth leg 414 is bent and deformed radially inward by the first clamper 91 and the second clamper 92, the tip 44 of the third leg 413 in the axial direction is bent and deformed. The radial inward inclination angle θ3 of is larger than the radial inward inclination angle θ2 of the tip portion 44 of the second leg portion 412 with respect to the axial direction, and the radial inner side of the tip portion 44 of the fourth leg portion 414. The inclination angle θ4 to is larger than the inclination angle θ3. Further, when the tip portion 44 of the fifth leg portion 415 to the seventh leg portion 417 is bent and deformed radially outward by the first clamper 91 and the second clamper 92 in this way, the sixth leg portion 416 with respect to the axial direction The radial outward inclination angle θ6 of the tip portion 44 is larger than the radial outward inclination angle θ7 of the tip portion 44 of the seventh leg portion 417 with respect to the axial direction, and the tip portion 44 of the fifth leg portion 415. The inclination angle θ5 outward in the radial direction is larger than the inclination angle θ6.

As a result, of the tip portions 44 of the second leg portion 421 to the fourth leg portion 414, the tip portion 44 of the fourth leg portion 414 is bent so as to be most inclined inward in the radial direction, and the fifth leg portion 415th to the fifth leg portion 415th. Of the tip 44s of the 7 leg 417, the tip 44 of the 5th leg 415 is bent so as to be most inclined outward in the radial direction, so that the tip of the 4th segment conductor and the tip of the 5th segment conductor are bent. The radial distance from the portion, that is, the radial distance between the first joint portion 451 and the second joint portion 452 can be made larger, and the partial discharge start voltage of the coil 30 can be made higher.

Further, the tip portion 44 of the first leg portion 411 and the tip portion 44 of the eighth leg portion 418 are not bent in the radial inward direction and the radial outer direction, and extend in parallel with the axial direction. The radial distance between the tip of the fourth segment conductor and the tip of the fifth segment conductor can be increased without increasing the radial length of the coil end portion 31.

<Coil configuration with segment conductors>
Next, the configuration of the coil 30 by the segment conductors 40 (lapped segment conductor 40A and corrugated segment conductor 40B) inserted into each slot 22 of the stator core 20 will be described.

As shown in FIG. 8, a U-phase leader wire 50U, a V-phase leader wire 50V, and a W-phase leader wire 50W are connected to the coil 30. It is electrically connected to a power conversion device (not shown). When the rotary electric machine is driven as an electric motor, the U-phase leader line 50U, the V-phase leader line 50V, and the W-phase leader line 50W are each U of the three-phase AC power supplied from a power conversion device (not shown) or the like. Phase AC power, V phase AC power, and W phase AC power are supplied to the coil 30. When the rotary electric machine is driven as a generator, the U-phase leader line 50U, the V-phase leader line 50V, and the W-phase leader line 50W are U-phase AC power among the three-phase AC power generated by the rotary electric power, respectively. V-phase AC power and W-phase AC power are supplied to a power conversion device (not shown) or the like.

In the present embodiment, the U-phase leader line 50U has two leader lines, a first U-phase leader line 51U and a second U-phase leader line 52U. The V-phase leader line 50V has two leader lines, a first V-phase leader line 51V and a second V-phase leader line 52V. The W-phase leader line 50W has two leader lines, a first W-phase leader line 51W and a second W-phase leader line 52W. The first U phase leader line 51U and the second U phase leader line 52U, the first V phase leader line 51V and the second V phase leader line 52V, and the first W phase leader line 51W and the second W phase leader line 52W are predetermined segments, respectively. It is electrically connected to the tip 44 of the conductor 40. Which segment conductors are the 1st U phase leader line 51U and the 2nd U phase leader line 52U, the 1st V phase leader line 51V and the 2nd V phase leader line 52V, and the 1st W phase leader line 51W and the 2nd W phase leader line 52W, respectively. Details of whether or not the tip 44 of the 40 is electrically connected will be described later.

A first U phase bridge 61U and a second U phase bridge 62U, a first V phase bridge 61V and a second V phase bridge 62V, and a first W phase bridge 61W and a second W phase bridge 62W are connected to the coil 30. The 1st U phase bridge 61U and the 2nd U phase bridge 62U, the 1st V phase bridge 61V and the 2nd V phase bridge 62V, and the 1st W phase bridge 61W and the 2nd W phase bridge 62W are all conductors and are insulated and coated. However, it does not have to be insulated. The 1st U phase bridge 61U and the 2nd U phase bridge 62U, the 1st V phase bridge 61V and the 2nd V phase bridge 62V, and the 1st W phase bridge 61W and the 2nd W phase bridge 62W all rotate on the outer side in the axial direction of the coil 30. It extends in the direction and both ends are electrically connected to the tip 44 of the different segment conductors 40. The 1st U phase bridge 61U and the 2nd U phase bridge 62U, the 1st V phase bridge 61V and the 2nd V phase bridge 62V, and the 1st W phase bridge 61W and the 2nd W phase bridge 62W have the tip 44 of which segment conductor 40, respectively. Details of whether or not they are electrically connected will be described later.

A neutral point 70 is connected to the coil 30. The neutral point 70 is a conductor and may or may not be insulatedly coated. In the present embodiment, the neutral point 70 extends radially outside the coil 30 and is electrically connected to the tip ends 44 of the plurality of segment conductors 40. The details of which segment conductor 40 the tip portion 44 of the neutral point 70 is electrically connected to will be described later.

As shown in FIG. 9, the coil 30 is composed of a three-phase coil of a U-phase coil 30U, a V-phase coil 30V, and a W-phase coil 30W. The U-phase coil 30U is electrically connected to the U-phase leader wire 50U. The V-phase coil 30V is electrically connected to the V-phase leader wire 50V. The W-phase coil 30W is electrically connected to the W-phase leader wire 50W.

The U-phase coil 30U is configured by connecting four windings U1, U2, U3, and U4 in parallel. The windings U1, U2, U3, and U4, respectively, are wound clockwise U1-1, U2-1, U3-1, when viewed radially outward from the central axis CL of the stator core 20, respectively. It has a U4-1 and windings U1-2, U2-2, U3-2, and U4-2 that are wound counterclockwise. One end of the windings U1-1 and U2-1 is electrically connected to the first U phase leader wire 51U. One end of the windings U3-1 and U4-1 is electrically connected to the second U phase leader wire 52U. The other ends of the windings U1-1 and U2-1 and one ends of the windings U1-2 and U2-2 are electrically connected via a first U-phase bridge 61U. The other ends of the windings U3-1 and U4-1 and one ends of the windings U3-2 and U4-2 are electrically connected via a second U-phase bridge 62U. The other ends of the windings U1-2 and U2-2 and the other ends of the windings U3-2 and U4-2 are electrically connected to the neutral point 70.

The V-phase coil 30V is configured by connecting four windings V1, V2, V3, and V4 in parallel. The windings V1, V2, V3, and V4 are wound clockwise V1-1, V2-1, V3-1, respectively, when viewed radially outward from the central axis CL of the stator core 20, respectively. It has V4-1 and windings V1-2, V2-2, V3-2, and V4-2 that are wound counterclockwise. One end of the windings V1-1 and V2-1 is electrically connected to the first V phase leader wire 51V. One end of the windings V3-1 and V4-1 is electrically connected to the second V phase leader line 52V. The other ends of the windings V1-1 and V2-1 and one ends of the windings V1-2 and V2-2 are electrically connected via a first V-phase bridge 61V. The other ends of the windings V3-1 and V4-1 and one ends of the windings V3-2 and V4-2 are electrically connected via a second V-phase bridge 62V. The other ends of the windings V1-2 and V2-2 and the other ends of the windings V3-2 and V4-2 are electrically connected to the neutral point 70.

The W-phase coil 30W is configured by connecting four windings W1, W2, W3, and W4 in parallel. The windings W1, W2, W3, and W4, respectively, are wound clockwise W1-1, W2-1, W3-1, when viewed radially outward from the central axis CL of the stator core 20, respectively. It has W4-1 and windings W1-2, W2-2, W3-2, and W4-2 that are wound counterclockwise. One end of the windings W1-1 and W2-1 is electrically connected to the first W phase leader wire 51W. One end of the windings W3-1 and W4-1 is electrically connected to the second W phase leader line 52W. The other ends of the windings W1-1 and W2-1 and one ends of the windings W1-2 and W2-2 are electrically connected via a first W phase bridge 61W. The other ends of the windings W3-1 and W4-1 and one ends of the windings W3-2 and W4-2 are electrically connected via a second W phase bridge 62W. The other ends of the windings W1-2 and W2-2 and the other ends of the windings W3-2 and W4-2 are electrically connected to the neutral point 70.

For the sake of simplicity and clarity of the description of the 48 slots 22 of the stator core 20, for convenience, when viewed from the first end surface 201 side of the stator core 20, as shown in FIG. 2, the first slots 2201 to 1st are clockwise. 48 slots 2248.

Here, the configuration of the V-phase coil 30V among the three-phase coils of the U-phase coil 30U, the V-phase coil 30V, and the W-phase coil 30W constituting the coil 30 will be described with reference to FIG. In FIG. 10, the leg 41 constituting the windings V1 and V2 is shown in dark color (shading of fine dots), and the leg 41 constituting the windings V3 and V4 is shown in light color (shading of coarse dots). ).

As shown in FIG. 10, when viewed from the first end surface 201 side of the stator core 20, the second end 41b of the first leg 411 and the fifth slot 22 inserted counterclockwise in the circumferential direction. The second end 41b of the five leg portions 415 are connected by a curved portion 42 to form a pair of leg portions 41 of the lap winding segment conductor 40A. The second end 41b of the second leg 412 and the second end 41b of the sixth leg 416 inserted into the fifth slot 22 counterclockwise in the circumferential direction are connected by the curved portion 42. It is a pair of leg portions 41 of the lap winding segment conductor 40A. The second end 41b of the third leg 413 and the second end 41b of the seventh leg 417 inserted into the fifth slot 22 clockwise in the circumferential direction are connected by the curved portion 42. It is a pair of leg portions 41 of the wave winding segment conductor 40B. The second end 41b of the fourth leg 414 and the second end 41b of the eighth leg 418 inserted into the fifth slot 22 counterclockwise in the circumferential direction are connected by the curved portion 42. It is a pair of leg portions 41 of the wave winding segment conductor 40B.

Therefore, when viewed from the first end surface 201 side of the stator core 20, the second end 41b of the fifth leg 415 and the first leg 411 inserted into the fifth slot 22 clockwise in the circumferential direction are the first. The two end portions 41b are connected by a curved portion 42 to form a pair of leg portions 41 of the lap winding segment conductor 40A. The second end 41b of the sixth leg 416 and the second end 41b of the second leg 412 inserted into the fifth slot 22 clockwise in the circumferential direction are connected by the curved portion 42. It is a pair of leg portions 41 of the lap winding segment conductor 40A. The second end 41b of the seventh leg 417 and the second end 41b of the third leg 413 inserted clockwise in the fifth slot 22 in the circumferential direction are connected by the curved portion 42. It is a pair of leg portions 41 of the wave winding segment conductor 40B. The second end 41b of the eighth leg 418 and the second end 41b of the fourth leg 414 inserted into the fifth slot 22 clockwise in the circumferential direction are connected by the curved portion 42. It is a pair of leg portions 41 of the wave winding segment conductor 40B.

The tip 44 of the 7th leg 417 inserted into the 28th slot 2228 and the tip 44 of the 8th leg 418 are joined and conducted by, for example, laser welding. Further, the tip portion 44 of the fifth leg portion 415 inserted into the 22nd slot 2222 and the tip portion 44 of the sixth leg portion 416 are joined and conducted by, for example, laser welding. On the other hand, the joined tip 44 of the 7th leg 417 and the 8th leg 418 inserted into the 28th slot 2228, and the 5th leg 415 and the 6th leg 416 inserted into the 22nd slot 2222. Although they are arranged in a substantially straight line in the radial direction with the joined tip portions 44 of the above, they are not joined and are not conducting.

Similarly, the tip portion 44 of the seventh leg portion 417 inserted into the 27th slot 2227 and the tip portion 44 of the eighth leg portion 418 are joined and conducted by, for example, laser welding. Further, the tip portion 44 of the fifth leg portion 415 inserted into the 21st slot 2221 and the tip portion 44 of the sixth leg portion 416 are joined and conducted by, for example, laser welding. On the other hand, the joined tip 44 of the 7th leg 417 and the 8th leg 418 inserted into the 27th slot 2227, and the 5th leg 415 and the 6th leg 416 inserted into the 21st slot 2221. Although they are arranged in a substantially straight line in the radial direction with the joined tip portions 44 of the above, they are not joined and are not conducting.

Further, the tip portion 44 of the seventh leg portion 417 inserted into the 21st slot 2221 and the tip portion 44 of the eighth leg portion 418 are joined and conducted by, for example, laser welding. Further, the tip portion 44 of the fifth leg portion 415 inserted into the fifteenth slot 2215 and the tip portion 44 of the sixth leg portion 416 are joined and conducted by, for example, laser welding. On the other hand, the joined tip 44 of the 7th leg 417 and the 8th leg 418 inserted into the 21st slot 2221 and the 5th leg 415 and the 6th leg 416 inserted into the 15th slot 2215. Although they are arranged in a substantially straight line in the radial direction with the joined tip portions 44 of the above, they are not joined and are not conducting.

Similarly, the tip 44 of the 7th leg 417 inserted into the 22nd slot 2222 and the tip 44 of the 8th leg 418 are joined and conducted by, for example, laser welding. Further, the tip portion 44 of the fifth leg portion 415 inserted into the 16th slot 2216 and the tip portion 44 of the sixth leg portion 416 are joined and conducted by, for example, laser welding. On the other hand, the joined tip 44 of the 7th leg 417 and the 8th leg 418 inserted into the 22nd slot 2222, and the 5th leg 415 and the 6th leg 416 inserted into the 16th slot 2216. Although they are arranged in a substantially straight line in the radial direction with the joined tip portions 44 of the above, they are not joined and are not conducting.

Then, the tip of the first V-phase leader 51V of the V-phase leader 50V and the joined tip 44 of the seventh leg 417 and the eighth leg 418 inserted into the 28th slot 2228 are, for example, a laser. It is joined and conducted by welding. Then, the tip 44 of the eighth leg 418 inserted into the 28th slot 2228 becomes the starting point of the winding V1-1, and the tip 44 of the seventh leg 417 inserted into the 28th slot 2228 becomes the winding V2. It is the starting point of -1.

The tip of the second V-phase leader 52V of the V-phase leader 50V and the joined tip 44 of the seventh leg 417 and the eighth leg 418 inserted into the 27th slot 2227 are, for example, by laser welding. , Joined and conducting. Then, the tip 44 of the eighth leg 418 inserted into the 27th slot 2227 becomes the starting point of the winding V3-1, and the tip 44 of the seventh leg 417 inserted into the 27th slot 2227 becomes the winding V4. It is the starting point of -1.

Conventionally, when four windings V1, V2, V3, and V4 are connected in parallel to form a V-phase coil 30V, the V-phase leader wire 50V requires four leader wires equal to the number of parallel wires. .. In the present embodiment, the tip of the first V-phase leader 51V of the V-phase leader 50V is joined to the joined tip 44 of the seventh leg 417 and the eighth leg 418 inserted into the 28th slot 2228. , The tip of the second V phase leader 52V is joined to the joined tip 44 of the seventh leg 417 and the eighth leg 418 inserted into the 27th slot 2227. As a result, the V-phase leader wire 50V and the windings V1, V2, V3, and V4 can be conducted by the two leader wires, so that the winding of each phase can be performed without increasing the number of leader wires of each phase. The number of parallel lines can be increased from 2 to 4.

Next, windings V1 (V1-1, V1-2) and windings V2 (V2-1, V2-2) will be described.

The winding V1-1 starts from the tip 44 of the eighth leg 418 inserted in the 28th slot 2228, and the eighth leg 418 inserted in the 28th slot 2228 is the 33rd slot 2233 by the curved portion 42. The fourth leg 414 inserted into the 33rd slot 2233 is connected to the second leg 412 inserted into the 39th slot 2239 by the first joint 451. The second leg 412 inserted into the 39th slot 2239 is connected to the sixth leg 416 inserted into the 34th slot 2234 by the curved portion 42, and the sixth leg 416 inserted into the 34th slot 2234 is connected to the sixth leg 416 inserted into the 34th slot 2234. The fourth leg is connected to the eighth leg 418 inserted into the 40th slot 2240 by the two joints 452, and the eighth leg 418 inserted into the 40th slot 2240 is inserted into the 45th slot 2245 by the curved portion 42. The fourth leg 414 connected to the leg 414 and inserted into the 45th slot 2245 is connected to the second leg 412 inserted into the third slot 2203 by the first joint 451 and inserted into the third slot 2203. The second leg 412 is connected to the sixth leg 416 inserted into the 46th slot 2246 by the curved portion 42, and the sixth leg 416 inserted into the 46th slot 2246 is connected to the sixth leg 416 inserted into the 46th slot 2246 by the second joint 452. The eighth leg 418 inserted into the four slot 2204 is connected, and the eighth leg 418 inserted into the fourth slot 2204 is connected to the fourth leg 414 inserted into the ninth slot 2209 by the curved portion 42. , The fourth leg 414 inserted into the ninth slot 2209 is connected to the second leg 412 inserted into the fifteenth slot 2215 by the first joint 451 and the second leg inserted into the fifteenth slot 2215. The 412 is connected to the sixth leg 416 inserted into the tenth slot 2210 by the curved portion 42, and the sixth leg 416 inserted into the tenth slot 2210 is inserted into the 16th slot 2216 by the second joint 452. The eighth leg 418 inserted into the 16th slot 2216 is connected to the fourth leg 414 inserted into the 21st slot 2221 by the curved portion 42, and is connected to the 8th leg 418, and is connected to the 21st slot 2221. The inserted fourth leg 414 is connected to the second leg 412 inserted into the 27th slot by the first joint 451 and the second leg 412 inserted into the 27th slot is 22nd by the curved portion 42. Connected to the 6th leg 416 inserted into the slot 2222, the 22nd The tip 44 of the sixth leg 416 inserted into the slot 2222 is formed so as to be the end point. As a result, the winding V1-1 is viewed from the central axis CL of the stator core 20 in the radial direction outward, from the tip 44 of the eighth leg 418 inserted into the 28th slot 2228, which is the start point, at the end point. It is wound four times clockwise between the tip 44 of the sixth leg 416 inserted into the 22nd slot 2222.

The winding V2-1 starts from the tip 44 of the 7th leg 417 inserted into the 28th slot 2228, and the 7th leg 417 inserted into the 28th slot 2228 is the 33rd slot 2233 by the curved portion 42. The third leg 413 inserted into the 33rd slot 2233 is connected to the first leg 411 inserted into the 39th slot 2239 by the first joint 451. The first leg 411 inserted into the 39th slot 2239 is connected to the fifth leg 415 inserted into the 34th slot 2234 by the curved portion 42, and the fifth leg 415 inserted into the 34th slot 2234 is connected to the fifth leg 415 inserted into the 34th slot 2234. A third leg 417 inserted into the 40th slot 2240 by the two joints 452, and a seventh leg 417 inserted into the 40th slot 2240 inserted into the 45th slot 2245 by the curved portion 42. The third leg 413 connected to the leg 413 and inserted into the 45th slot 2245 is connected to the first leg 411 inserted into the third slot 2203 by the first joint 451 and inserted into the third slot 2203. The first leg portion 411 is connected to the fifth leg portion 415 inserted into the 46th slot 2246 by the curved portion 42, and the fifth leg portion 415 inserted into the 46th slot 2246 is connected to the fifth leg portion 415 inserted into the 46th slot 2246 by the second joint portion 452. It is connected to the 7th leg 417 inserted into the 4 slot 2204, and the 7th leg 417 inserted into the 4th slot 2204 is connected to the 3rd leg 413 inserted into the 9th slot 2209 by the curved portion 42. , The third leg 413 inserted into the ninth slot 2209 is connected to the first leg 411 inserted into the fifteenth slot 2215 by the first joint 451 and the first leg inserted into the fifteenth slot 2215. The 411 is connected to the fifth leg 415 inserted into the tenth slot 2210 by the curved portion 42, and the fifth leg 415 inserted into the tenth slot 2210 is inserted into the 16th slot 2216 by the second joint 452. The 7th leg 417 inserted into the 16th slot 2216 is connected to the 7th leg 417 and connected to the 3rd leg 413 inserted into the 21st slot 2221 by the curved portion 42, and is connected to the 21st slot 2221. The inserted third leg 413 is connected to the first leg 411 inserted into the 27th slot by the first joint 451 and the first leg 411 inserted into the 27th slot is 22nd by the curved portion 42. Connected to the fifth leg 415 inserted into slot 2222, the 22nd The tip 44 of the fifth leg 415 inserted into the slot 2222 is formed so as to be the end point. As a result, the winding V2-1 is inserted into the 28th slot 2228 which is joined to the 1st V phase leader line 51V which is the starting point when viewed from the central axis CL of the stator core 20 in the radial direction. It is wound four times clockwise from the tip 44 of the 417 to the tip 44 of the fifth leg 415 inserted into the 22nd slot 2222, which is the end point.

One end of the first V-phase bridge 61V is joined to the joined tip 44 of the fifth leg 415 and the sixth leg 416 inserted into the 22nd slot 2222, and the other end is the second. It is joined to the joined tip portion 44 of the fifth leg portion 415 and the sixth leg portion 416 inserted into the 15 slot 2215 to conduct conduction. Therefore, the joined tip portion 44 of the fifth leg portion 415 and the sixth leg portion 416 inserted into the 22nd slot 2222 and the fifth leg portion 415 and the sixth leg portion 416 inserted into the fifteenth slot 2215. The joined tip portion 44 is conductive via the first V-phase bridge 61V.

Then, the tip 44 of the sixth leg 416 inserted into the 15th slot 2215 to be joined to the other end of the first V-phase bridge 61V becomes the starting point of the winding V1-2, and the other end of the first V-phase bridge 61V. The tip portion 44 of the fifth leg portion 415 inserted into the fifteenth slot 2215 to be joined with is the starting point of the winding V2-2.

The winding V1-2 starts from the tip 44 of the sixth leg 416 inserted into the 15th slot 2215, and the sixth leg 416 inserted into the 15th slot 2215 is the 20th slot 2220 by the curved portion 42. The second leg 412 inserted into the 20th slot 2220 is connected to the fourth leg 414 inserted into the 14th slot 2214 by the first joint 451. The fourth leg 414 inserted into the 14th slot 2214 is connected to the eighth leg 418 inserted into the ninth slot 2209 by the curved portion 42, and is connected to the eighth leg 418 inserted into the ninth slot 2209. Was connected to the sixth leg 416 inserted into the third slot 2203 by the second joint 452, and the sixth leg 416 inserted into the third slot 2203 was inserted into the eighth slot 2208 by the curved portion 42. The second leg 412 connected to the second leg 412 and inserted into the eighth slot 2208 is connected to the fourth leg 414 inserted into the second slot 2202 by the first joint 451 and is connected to the second slot 2202. The fourth leg portion 414 inserted into the fourth leg portion 414 is connected to the eighth leg portion 418 inserted into the 45th slot 2245 by the curved portion 42, and the eighth leg portion 418 inserted into the 45th slot 2245 is connected to the second joint portion 452. The sixth leg 416 inserted into the 39th slot 2239 was connected to the sixth leg 416 inserted into the 39th slot 2239 by the curved portion 42 into the second leg 412 inserted into the 44th slot 2244 by the curved portion 42. The fourth leg 412 connected and inserted into the 44th slot 2244 is connected to the fourth leg 414 inserted into the 38th slot 2238 by the first joint 451 and inserted into the 38th slot 2238. The leg 414 is connected to the eighth leg 418 inserted into the 33rd slot 2233 by the curved portion 42, and the eighth leg 418 inserted into the 33rd slot 2233 is connected to the 27th slot 2227 by the second joint 452. The sixth leg 416 inserted into the 27th slot 2227 is connected to the second leg 412 inserted into the 32nd slot 2232 by the curved portion 42, and is connected to the inserted sixth leg 416. The second leg 412 inserted into the 2232 is connected to the fourth leg 414 inserted into the 26th slot by the first joint 451 and the fourth leg 414 inserted into the 26th slot is connected by the curved portion 42. Connected to the 8th leg 418 inserted in the 21st slot 2221, the second The tip portion 44 of the eighth leg portion 418 inserted into the slot 2221 is formed so as to be the end point. As a result, the winding V1-2 is viewed from the central axis CL of the stator core 20 in the radial direction, and the tip of the sixth leg portion 416 inserted into the fifteenth slot 2215 that joins with the second V-phase bridge 62V. Starting from 44, it is wound four times counterclockwise from the tip 44 of the eighth leg 418 of the 21st slot 2221.

The winding V2-2 starts from the tip 44 of the fifth leg 415 inserted into the 15th slot 2215, and the fifth leg 415 inserted into the 15th slot 2215 is the 20th slot 2220 by the curved portion 42. The first leg 411 inserted into the 20th slot 2220 is connected to the third leg 413 inserted into the 14th slot 2214 by the first joint 451. The third leg 413 inserted into the 14th slot 2214 is connected to the 7th leg 417 inserted into the 9th slot 2209 by the curved portion 42, and is connected to the 7th leg 417 inserted into the 9th slot 2209. Was connected to the fifth leg 415 inserted into the third slot 2203 by the second joint 452, and the fifth leg 415 inserted into the third slot 2203 was inserted into the eighth slot 2208 by the curved portion 42. The first leg 411 connected to the first leg 411 and inserted into the eighth slot 2208 is connected to the third leg 413 inserted into the second slot 2202 by the first joint 451 to connect to the second slot 2202. The third leg portion 413 inserted into the slot 42 is connected to the seventh leg portion 417 inserted into the 45th slot 2245 by the curved portion 42, and the seventh leg portion 417 inserted into the 45th slot 2245 is connected to the second joint portion 452. The fifth leg 415 inserted into the 39th slot 2239 was connected to the fifth leg 415 inserted into the 39th slot 2239 by the curved portion 42 into the first leg 411 inserted into the 44th slot 2244 by the curved portion 42. A third leg portion 411 connected and inserted into the 44th slot 2244 is connected to a third leg portion 413 inserted into the 38th slot 2238 by the first joint portion 451 and inserted into the 38th slot 2238. The leg 413 is connected to the seventh leg 417 inserted into the 33rd slot 2233 by the curved portion 42, and the seventh leg 417 inserted into the 33rd slot 2233 is connected to the 27th slot 2227 by the second joint 452. The fifth leg 415 inserted into the 27th slot 2227 is connected to the first leg 411 inserted into the 32nd slot 2232 by the curved portion 42, and is connected to the inserted fifth leg 415. The first leg 411 inserted into the 2232 is connected to the third leg 413 inserted into the 26th slot by the first joint 451 and the third leg 413 inserted into the 26th slot is connected by the curved portion 42. Connected to the 7th leg 417 inserted into the 21st slot 2221, the second The tip portion 44 of the seventh leg portion 417 inserted into the slot 2221 is formed so as to be the end point. As a result, the winding V2-2 is inserted into the fifth leg portion 415 inserted into the fifteenth slot 2215 which is joined to the second V-phase bridge 62V which is the starting point when viewed from the central axis CL of the stator core 20 in the radial direction. From the tip end portion 44 of the above to the tip end portion 44 of the seventh leg portion 417 of the 21st slot 2221 which is the end point, the winding is performed four times counterclockwise.

Then, the joined tip portion 44 of the seventh leg portion 417 and the eighth leg portion 418 inserted into the 21st slot 2221 is joined to the neutral point 70 and conducts.

Next, the winding V3 (V3-1, V3-2) and the winding V4 (V4-1, V4-2) will be described.

The winding V3-1 is wound in the same manner as the winding V1-1 at a position where the slot 22 is shifted counterclockwise by one with respect to the winding V1-1 when viewed from the first end surface 201 side of the stator core 20. It is formed to turn. Therefore, the winding V3-1 starts at the tip 44 of the eighth leg 418 inserted in the 27th slot 2227 and ends at the tip 44 of the sixth leg 416 inserted in the 21st slot 2221. Become. The winding V3-1 ends from the tip 44 of the eighth leg 418 inserted into the 27th slot 2227, which is the start point when viewed from the central axis CL of the stator core 20 in the radial direction. It is wound four times clockwise between the tip portion 44 of the sixth leg portion 416 inserted into the 21st slot 2221.

The winding V4-1 is wound in the same manner as the winding V2-1 at a position where the slot 22 is shifted counterclockwise by one with respect to the winding V2-1 when viewed from the first end surface 201 side of the stator core 20. It is formed to turn. Therefore, the winding V4-1 starts at the tip 44 of the seventh leg 417 inserted in the 27th slot 2227 and ends at the tip 44 of the fifth leg 415 inserted in the 21st slot 2221. Become. The winding V4-1 ends from the tip 44 of the seventh leg 417 inserted into the 27th slot 2227, which is the start point when viewed from the central axis CL of the stator core 20 in the radial direction. By the tip 44 of the fifth leg 415 inserted in the 21st slot 2221, the fifth leg is wound clockwise four times.

One end of the second V-phase bridge 62V is joined to the joined tip 44 of the fifth leg 415 and the sixth leg 416 inserted into the 21st slot 2221, and the other end is the second. It is joined to the joined tip portion 44 of the fifth leg portion 415 and the sixth leg portion 416 inserted into the 16 slot 2216 to conduct conduction. Therefore, the joined tip portion 44 of the fifth leg portion 415 and the sixth leg portion 416 inserted into the 21st slot 2221 and the fifth leg portion 415 and the sixth leg portion 416 inserted into the 16th slot 2216. The joined tip portion 44 is conductive via the second V-phase bridge 62V.

Then, the tip 44 of the sixth leg 416 inserted into the 16th slot 2216 joined to the other end of the second V-phase bridge 62V becomes the starting point of the winding V3-2, and the other end of the second V-phase bridge 62V. The tip 44 of the fifth leg 415 inserted into the 16th slot 2216 to be joined with the winding V4-2 is the starting point.

The winding V3-2 is wound in the same manner as the winding V1-2 at a position where the slot 22 is shifted clockwise by one with respect to the winding V1-2 when viewed from the first end surface 201 side of the stator core 20. It is formed to do. Therefore, the winding V3-2 starts at the tip 44 of the sixth leg 416 inserted in the 16th slot 2216 and ends at the tip 44 of the eighth leg 418 inserted in the 22nd slot 2222. Become. The winding V3-2 ends from the tip 44 of the sixth leg 416 inserted into the 16th slot 2216, which is the start point, when viewed from the central axis CL of the stator core 20 in the radial direction. By the tip 44 of the eighth leg 418 inserted in the 22nd slot 2222, the eighth leg is wound four times counterclockwise.

The winding V4-2 is wound in the same manner as the winding V2-2 at a position where the slot 22 is shifted clockwise by one with respect to the winding V2-2 when viewed from the first end surface 201 side of the stator core 20. Formed to do. Therefore, the winding V4-2 starts at the tip 44 of the fifth leg 415 inserted in the 16th slot 2216, and ends at the tip 44 of the seventh leg 417 inserted in the 22nd slot 2222. Become. The winding V4-2 ends from the tip 44 of the fifth leg 415 inserted into the 16th slot 2216, which is the start point, when viewed from the central axis CL of the stator core 20 in the radial direction. The seventh leg portion 417 inserted into the 22nd slot 2222 is wound around four turns counterclockwise between the tip portion 44 and the tip portion 44.

Then, the joined tip portion 44 of the seventh leg portion 417 and the eighth leg portion 418 inserted into the 22nd slot 2222 is joined to the neutral point 70 and conducts.

As described above, the oblique portion 43 of the first leg portion 411 and the second leg portion 412 is oblique in the counterclockwise direction in the circumferential direction, and the third leg portion 413 and the fourth leg portion 414 are oblique. The row portion 43 is oblique in the clockwise direction in the circumferential direction, and the oblique portion 43 of the fifth leg portion 415 and the sixth leg portion 416 is oblique in the clockwise direction in the circumferential direction. , The oblique portion 43 of the 7th leg portion 417 and the 8th leg portion 418 is oblique in the counterclockwise direction in the circumferential direction, so that the first leg portion 411 and the second leg portion 412, the third leg portion 43 The leg 413 and the fourth leg 414, the fifth leg 415 and the sixth leg 416, and the seventh leg 417 and the eighth leg 418 facilitate the winding V1 and the winding V2 connected in parallel. Can be configured. As a result, eight layers of the leg portions 41 of the segment conductor 40 are inserted in a row in the radial direction in each slot 22, and four windings V1, V2, V3, and V4 are connected in parallel. Can be easily configured, so that a larger current can be passed through the V-phase coil 30V, and high output and high torque can be achieved.

Further, conventionally, when four windings V1, V2, V3, and V4 are connected in parallel to form a V-phase coil 30V, four bridges having the same number as the number of parallel windings are required. In the present embodiment, the four windings V1, V2, V3, and V4 can be connected in parallel by the two bridges of the first V phase bridge 61V and the second V phase bridge 62V. As a result, four windings can be connected in parallel with two bridges, so that the number of parallel windings in each phase can be increased from 2 to 4 without increasing the number of bridges in each phase. it can.

Although detailed description of the configurations of the U-phase coil 30U and the W-phase coil 30W is omitted, as shown in FIG. 11, the U-phase coil 30U is a V-phase coil 30V when viewed from the first end surface 201 side of the stator core 20. On the other hand, the configuration is the same as that of the V-phase coil 30V except that the slots 22 are displaced by four counterclockwise. The W-phase coil 30W has the same configuration as the V-phase coil 30V except that the slots 22 are shifted clockwise by four with respect to the V-phase coil 30V when viewed from the first end surface 201 side of the stator core 20. ing.

In FIG. 11, u, v, w in the reference numerals (18u, 25v, 31w, etc.) added to the first leg portions 411 to the eighth leg portions 418 inserted in the first slots 2201 to the 48th slots 2248 are It indicates which of the U-phase, V-phase, and W-phase windings constitutes the winding, and the number part is the number from the U-phase leader line 50U, the V-phase leader line 50V, and the W-phase leader line 50W. It is a leg portion 41 connected to, that is, indicates the connection order of the leg portions 41.

As a result, windings U1 to U4, V1 to V4, and W1 to W4 are formed by the segment conductors 40 inserted into the slots 22 of the stator core 20, so that the legs 41 are arranged in a radial direction in each slot 22. An 8-layer 4-parallel rotary electric machine can be configured in which 8 layers are inserted and 4 windings of each phase are connected in parallel.

<Loss in coil>
Generally, when a current flows through a coil of a rotary electric machine, a copper loss Wc represented by the following equation (1) occurs due to the winding resistance of the windings constituting the coil.
Wc = R × i ² ... (1)
Wc: Copper loss [W]
R: Winding resistance [Ω]
i: Current flowing through the winding [A]

Therefore, the larger the cross-sectional area of the windings constituting the coil, the smaller the winding resistance, and the copper loss Wc becomes smaller in proportion to the winding resistance. Further, the smaller the current flowing through the winding, the smaller the copper loss Wc becomes in proportion to the current flowing through the winding.

When aiming for high output and high torque of a rotary electric machine, one of the methods is to increase the current flowing through the coil. At this time, if the number of parallel windings of the coil is increased, the current flowing through the windings can be equally divided. Therefore, even if the current flowing through the coil is increased, the current flowing through the windings does not increase.

Further, in the rotary electric machine, when the rotor rotates, the leakage flux in the circumferential direction flows from the rotor side to the stator core side. When this leakage flux flows through the conductor portion of the winding that constitutes the coil, an eddy current is generated in the conductor portion of the winding, and an eddy current loss We represented by the following equation (2) occurs.
We ∝ f ² Bm ² t ² ... (2)
We: Eddy current loss [W]
f: Frequency [Hz]
Bm: Magnetic flux density [T]
t: Radial thickness of the conductor of the winding [m]

Therefore, the smaller the radial thickness of the conductor portion of the winding, the smaller the eddy current loss We becomes in proportion to the square of the radial thickness of the conductor portion of the winding.

Using the same stator core 20, four layers of segment conductor legs whose radial thickness is about twice that of the present embodiment are inserted in each slot 22 in a radial direction, and two windings of each phase are arranged in parallel. The copper loss Wc and the eddy current loss We are compared between the four-layer, two-parallel rotary electric machine connected to the above and the eight-layer, four-parallel rotary electric machine of the present embodiment.

In the 8-layer 4-parallel rotary electric machine of the present embodiment, the winding resistance R is doubled because the radial thickness of the leg 41 is half that of the 4-layer 2-parallel rotary electric machine. Since the number of parallel lines is doubled, the current i flowing through the winding is halved. Therefore, according to the equation (1), the copper loss Wc of the 8-layer 4-parallel rotary electric machine of the present embodiment is theoretically about 1/2 that of the 4-layer 2-parallel rotary electric machine.

On the other hand, the 8-layer 4-parallel rotary electric machine of the present embodiment has half the thickness of the leg 41 in the radial direction as compared with the 4-layer 2-parallel rotary electric machine. The eddy current loss We of the 8-layer 4-parallel rotary electric machine is theoretically about 1/4 of that of the 4-layer 2-parallel rotary electric machine.

Further, the eddy current loss We increases in proportion to the square of the frequency. Therefore, the higher the rotation of the rotary electric machine, the higher the frequency, and the eddy current loss We becomes larger in proportion to the square of the frequency. Therefore, in each slot 22, four layers of segment conductor legs having a radial thickness about twice that of the present embodiment are inserted in a radial direction in a row, and two windings of each phase are connected in parallel. Comparing the loss caused by the rotary electric machine with two layers in parallel and the loss caused by the rotary electric machine with eight layers and four parallels in the present embodiment, in particular, the higher the rotation speed of the rotary electric machine, the more the eight layers and four parallels in the present embodiment. The rotary electric machine of No. 1 can significantly reduce the loss generated as compared with the rotary electric machine of 4 layers and 2 parallel.

Since the calorific value of each winding increases in proportion to the current density of the flowing current, the current flowing through each winding is the upper limit of the current at which the current density is equal to or less than a predetermined value from the viewpoint of heat generation and cooling of the rotating electric machine. It is desirable that it is less than or equal to the value. Since the radial thickness of the windings constituting the coil of the 4-layer 2-parallel rotary electric machine is about twice that of the present embodiment, one of the windings constituting the 8-layer 4-parallel rotary electric machine coil of the present embodiment is formed. The upper limit of the current at which the current density of the winding is equal to or less than the predetermined value is 1/2 of the upper limit of the current at which the current density of one winding constituting the coil of the four-layer two-parallel rotating electric machine is equal to or less than the predetermined value. Is. On the other hand, since the 4-layer 2-parallel rotary electric machine is in 2-parallel, the current can be bisected through the two windings, but the 8-layer 4-parallel rotary electric machine of the present embodiment has 4 layers. Since it is in parallel, the current can be divided into four equal parts and passed through the four windings. That is, in the 8-layer 4-parallel rotary electric machine of the present embodiment, the upper limit of the current at which the current density of one winding is equal to or less than a predetermined value is 1/2 of that of the 4-layer 2-parallel rotary electric machine. However, the number of windings that can pass current in parallel is doubled. Therefore, the coil of the 8-layer 4-parallel rotary electric machine of the present embodiment can be current to a value substantially the same as the upper limit of the current that can be passed through the 4-layer 2-parallel rotary electric machine coil.

Next, using the same stator core 20, eight layers of leg portions of segment conductors having the same cross section as in the present embodiment are inserted in a row in a radial direction in each slot 22, and two windings of each phase are inserted in parallel. The connected 8-layer 2-parallel rotary electric machine is compared with the 8-layer 4-parallel rotary electric machine of the present embodiment.

Since the 8-layer 2-parallel rotary electric machine and the 8-layer 4-parallel rotary electric machine of the present embodiment have eight layers of the same segment conductor legs inserted in a row in the radial direction in each slot 22, eddy currents are generated. The loss We is theoretically almost the same.

However, when the same current is passed through the coil of the rotary electric machine of 8 layers and 2 parallels and the coil of the rotary electric machine of 8 layers and 4 parallels of the present embodiment, the winding forming the coil of the rotary electric machine of 8 layers and 2 parallels is formed. Is about twice the current flowing in the windings constituting the coil of the 8-layer 4-parallel rotary electric machine of the present embodiment. That is, the current flowing through the windings constituting the coil of the 8-layer 4-parallel rotary electric machine of the present embodiment is about 1/2 of the current flowing through the windings constituting the coil of the 8-layer 2-parallel rotary electric machine. The copper loss Wc generated in the 8-layer 4-parallel rotary electric machine of the present embodiment is about 1/2 that of the 8-layer 2-parallel rotary electric machine.

Further, since the calorific value of each winding increases in proportion to the current density of the flowing current, the current flowing through each winding is the upper limit of the current at which the current density is equal to or less than a predetermined value from the viewpoint of heat generation and cooling of the rotating electric machine. It is desirable that the value is less than or equal to the value, but since the 8-layer 2-parallel rotary electric machine and the 8-layer 4-parallel rotary electric machine of the present embodiment have segment conductors having the same cross section, the current density of one winding is high. The upper limit of the current that is equal to or less than the predetermined value is the same. On the other hand, since the rotary electric machine with 8 layers and 2 parallels is 2 parallels, the current can be divided into two equal parts and passed through the two windings, so that the current density can be passed through the coil so as to be equal to or less than a predetermined value. The upper limit of the current that can be produced is about twice the upper limit of the current at which the current density of one winding is equal to or less than a predetermined value. On the other hand, since the 8-layer 4-parallel rotary electric machine of the present embodiment has 4 parallels, the current can be divided into 4 equal parts and passed through the 4 windings, so that the current density is kept below a predetermined value. The upper limit of the current that can be passed through the coil is about four times the upper limit of the current at which the current density of one winding is equal to or less than a predetermined value. Therefore, the upper limit of the current that can be passed through the coil of the 8-layer 4-parallel rotary electric machine of the present embodiment so that the current density is equal to or less than a predetermined value is that the current density is predetermined for the coil of the 8-layer 2-parallel rotary electric machine. It is about twice the upper limit of the current that can be passed so as to be less than or equal to the value. As described above, the 8-layer 4-parallel rotary electric machine of the present embodiment can pass a larger current through the coil than the 8-layer 2-parallel rotary electric machine, so that high output and high torque can be achieved.

As described above, the stator 10 of the 8-layer 4-parallel rotary electric machine of the present embodiment can reduce the loss generated in the rotary electric machine while achieving high output and high torque of the rotary electric machine.

<Relationship between aspect ratio and coil loss>
The segment conductor 40 is provided with an insulating coating portion 402 on a conductor portion 401 having a substantially rectangular cross section. In the radial thickness Lt of the conductor portion 401 and the circumferential width Lw of the conductor portion 401, the aspect ratio is represented by the radial thickness Lt / circumferential width Lw. The relationship between the aspect ratio and the coil loss in this embodiment will be described with reference to FIG.

As shown in FIG. 12, the copper loss Wc increases as the aspect ratio decreases. On the other hand, the eddy current loss We increases as the aspect ratio increases. When the aspect ratio is in the range of 0.5 or more and 0.7 or less, the sum of the copper loss Wc and the eddy current loss We becomes small. In particular, when the aspect ratio is in the range of 0.55 or more and 0.65 or less, the sum of the copper loss Wc and the eddy current loss We becomes smaller, and when the aspect ratio is about 0.6, the copper loss Wc and the eddy current loss The sum of We is the smallest.

The segment conductor 40 of the present embodiment has an aspect ratio represented by the radial thickness Lt / circumferential width Lw of the conductor portion 401 of 0.5 or more and 0.7 or less. Preferably, the segment conductor 40 has an aspect ratio represented by the radial thickness Lt / circumferential width Lw of the conductor portion 401 of 0.55 or more and 0.65 or less. More preferably, the segment conductor 40 has an aspect ratio of 0.6 in terms of the radial thickness Lt / circumferential width Lw of the conductor portion 401. Thereby, the loss in the coil 30 can be further reduced.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be appropriately modified, improved, and the like.

For example, in the present embodiment, the segment conductors 40 extend in parallel with each other, and the pair of legs 41 having the first end 41a and the second end 41b and the second ends 41b of the pair of legs 41 are connected to each other. Although it is assumed that the segment conductor 40 is provided with a curved portion 42 to be connected and has a substantially U shape, the segment conductor 40 does not have the second end portion 41b of the leg portion 41 connected by the curved portion 42. It may be joined by welding or the like.

In addition, at least the following matters are described in this specification. The components and the like corresponding to the above-described embodiments are shown in parentheses, but the present invention is not limited thereto.

(1) It has a plurality of teeth (teeth 21) protruding inward in the radial direction at predetermined intervals along the circumferential direction, and a plurality of slots (slots 22) which are spaces between the teeth adjacent to each other in the circumferential direction. A substantially ring-shaped stator core (stator core 20) and
A coil (coil 30) having a plurality of segment conductors (segment conductors 40) inserted into each of the plurality of slots is provided.
Each said segment conductor
It has legs (legs 41) that are arranged inside the slot and extend substantially linearly in the axial direction.
One end portion (first end portion 41a) in the axial direction of the leg portion protrudes outward from one end surface (first end surface 201) in the axial direction of the stator core, and is in the first direction (clockwise) or in the circumferential direction. An oblique portion (oblique portion 43) extending obliquely in the second direction (counterclockwise) and a tip portion (tip portion 44) extending axially outward from the tip of the skew portion are formed. Ori,
Each of the plurality of slots is a stator (stator 10) of a rotary electric machine in which the legs of eight segment conductors are inserted in a radial direction.
Seen from the one end surface side in the axial direction of the stator core
The legs of the eight segment conductors inserted in the slot in a radial direction are the first leg (first leg 411) and two layers arranged in the first layer counting from the inside in the radial direction. The second leg part (second leg part 412) arranged in the eyes, the third leg part (third leg part 413) arranged in the third layer, and the fourth leg part (fourth leg part) arranged in the fourth layer. Legs 414), 5th leg (5th leg 415) arranged in the 5th layer, 6th leg (6th leg 416) arranged in the 6th layer, 7th layer arranged It has a 7th leg (7th leg 417) and an 8th leg (8th leg 418) arranged in the 8th layer.
The oblique portion of the first leg portion and the second leg portion is oblique in the same direction of either the first direction or the second direction in the circumferential direction.
The oblique portion of the third leg portion and the fourth leg portion is the oblique portion of the first leg portion and the second leg portion of the first direction and the second direction in the circumferential direction. It is skewed in the opposite direction to
The oblique portion of the fifth leg portion and the sixth leg portion is oblique in the same direction of either the first direction or the second direction in the circumferential direction.
The slanted portion of the 7th leg portion and the 8th leg portion is oblique in the circumferential direction to the opposite side of the slanted portion of the 5th leg portion and the 6th leg portion of the rotary electric machine. Stator.

According to (1), since eight segment conductors are inserted into the slots in a radial direction when viewed from one end surface side in the axial direction of the stator core, the eddy current loss generated in the segment conductors can be reduced. , The loss in the coil can be reduced. Further, the oblique portions of the first leg portion and the second leg portion are oblique in the same direction of either the first direction or the second direction in the circumferential direction, and the third leg portion and the second leg portion are oblique. The oblique portion of the four legs is oblique in the circumferential direction in the direction opposite to the oblique portion of the first leg and the second leg among the first and second directions, and the fifth leg is And the oblique portion of the 6th leg is oblique in the same direction of either the 1st direction or the 2nd direction in the circumferential direction, and the oblique portion of the 7th leg and the 8th leg is oblique. The portions are oblique in the circumferential direction to the opposite side of the oblique portions of the 5th and 6th legs, so that the 1st and 2nd legs and the 3rd and 4th legs are oblique. , The fifth leg and the sixth leg, and the seventh leg and the eighth leg allow the windings connected in parallel to be easily configured. As a result, eight layers of segment conductor legs are inserted in a row in the radial direction in each slot, and four windings for each of the U-phase, V-phase, and W-phase are connected in parallel. Since the rotary electric machine can be easily configured, a large current can be passed through the coils of each phase, and high output and high torque can be achieved.

(2) The stator of the rotary electric machine according to (1).
The segment conductor has a conductor portion (conductor portion 401) having a substantially rectangular cross section, and is represented by the radial thickness (radial thickness Lt) / circumferential width (circumferential width Lw) of the conductor portion. A stator of a rotating electric machine having an aspect ratio of 0.5 or more and 0.7 or less.

According to (2), the segment conductor has a conductor portion having a substantially rectangular cross section, and the aspect ratio represented by the radial thickness / circumferential width of the conductor portion is 0.5 or more and 0.7 or less. Therefore, the loss in the coil can be further reduced.

(3) The stator of the rotary electric machine according to (1) or (2).
The coil has a U-phase coil (U-phase coil 30U), a V-phase coil (V-phase coil 30V), and a W-phase coil (W-phase coil 30W).
The U-phase coil is electrically connected to the U-phase leader wire (U-phase leader wire 50U), and the V-phase coil is electrically connected to the V-phase leader wire (V-phase leader wire 50V). The phase coil is electrically connected to the W phase leader wire (W phase leader wire 50W).
The U-phase leader line includes a first U-phase leader line (1st U-phase leader line 51U) connected to the 7th leg portion and the tip end portion of the 8th leg portion inserted into the predetermined slot, and the predetermined U-phase leader line. It has a second U phase leader line (second U phase leader line 52U) connected to the tip portion of the seventh leg portion and the eighth leg portion inserted in the slot different from the slot.
The V-phase leader is a first V-phase leader (first V-phase) connected to the tip of the seventh leg and the eighth leg inserted in a predetermined slot different from the U-phase leader. Leader line 51V) and a second V phase leader line (second V phase leader line 52V) connected to the seventh leg portion inserted into the slot different from the predetermined slot and the tip end portion of the eighth leg portion. And have
The W-phase leader is the first W-phase connected to the 7th leg and the tip of the 8th leg inserted in a predetermined slot different from the U-phase leader and the V-phase leader. A leader wire (first W phase leader wire 51W) and a second W phase leader wire (third) connected to the seventh leg portion inserted into the slot different from the predetermined slot and the tip portion of the eighth leg portion. A stator of a rotary electric machine having a 2W phase leader wire 52W).

According to (3), the coils of the U-phase, V-phase, and W-phase are electrically connected to the U-phase leader wire, the V-phase leader wire, and the W-phase leader wire, respectively, and the leaders of the respective phases are connected. The wires consist of a first leader wire connected to the tips of the seventh leg and the eighth leg inserted in the predetermined slot, and the seventh leg and the eighth leg inserted in a slot different from the predetermined slot. It has a second leader that connects to the tip of the portion. As a result, the leader wire of each phase can be connected to the winding of the coil of each of the four parallel phases by the two leader wires of the first leader wire and the second leader wire, so that the number of leader wires of each phase is increased. Without this, the number of parallel windings of the coil of each phase can be increased from 2 to 4.

(4) The stator of the rotary electric machine according to any one of (1) to (3).
The coil
The first leg and the tip of the second leg, and the third leg and the fourth leg inserted into the slots separated by a predetermined number in the first direction or the second direction in the circumferential direction. A first joint portion (first joint portion 451) in which the four tip portions of the tip portion of the portion are integrally joined to conduct conduction,
The tip of the fifth leg and the sixth leg, and the seventh leg and the eighth leg inserted into the slots separated by a predetermined number in the first direction or the second direction in the circumferential direction. A stator of a rotary electric machine having a second joint portion (second joint portion 452) in which the four tip portions of the tip portion of the leg portion are integrally joined and conducted.

According to (4), in the coil, the tips of the first to fourth legs are integrally joined to conduct conduction, and the tips of the fifth to eighth legs are integrated. Since it has a second joint that is joined to and conducts, it is possible to have two joints for the eight segment conductors inserted in each slot. This makes it possible to increase the radial distance between the joints and increase the partial discharge start voltage of the coil.

(5) The stator of the rotary electric machine according to (4).
The second leg portion, the third leg portion, and the tip portion of the fourth leg portion are bent so as to be inclined inward in the radial direction.
A stator of a rotary electric machine in which the fifth leg portion, the sixth leg portion, and the tip portion of the seventh leg portion are bent so as to be inclined outward in the radial direction.

According to (5), the tips of the second leg, the third leg, and the fourth leg are bent so as to be inclined inward in the radial direction, and the fifth leg, the sixth leg, and the like. And since the tip of the 7th leg is bent so as to incline outward in the radial direction, the radial distance between the tip of the 4th leg and the tip of the 5th leg, that is, the first joint The radial distance between the portion and the second joint portion becomes large. As a result, the partial discharge start voltage of the coil can be made higher.

(6) The stator of the rotary electric machine according to any one of (1) to (5).
The coil has a U-phase coil (U-phase coil 30U), a V-phase coil (V-phase coil 30V), and a W-phase coil (W-phase coil 30W).
The U-phase coil, the V-phase coil, and the W-phase coil are conductive by joining with the tip of the fifth leg and the sixth leg, each of which has one end inserted into the predetermined slot. The first bridge (first U-phase bridge 61U) whose other end is joined to and conducts with the tip of the fifth leg and the sixth leg inserted in the slot different from the predetermined slot. , 1V phase bridge 61V, 1W phase bridge 61W) and the 5th leg and the tip of the 6th leg, one end of which is inserted into a predetermined slot different from the 1st bridge. A second bridge (second U) in which the other end is joined to the tip of the fifth leg and the sixth leg inserted into the slot different from the predetermined slot. A stator of a rotary electric machine having a phase bridge 62U, a second V phase bridge 62V, and a second W phase bridge 62W).

According to (6), the U-phase, V-phase, and W-phase coils are joined to the tips of the fifth leg and the sixth leg, each of which has one end inserted into a predetermined slot. What is a first bridge that conducts and whose other end joins and conducts with the tips of the fifth leg and the sixth leg inserted in a slot different from the predetermined slot, and one end of the first bridge? The fifth leg and the sixth leg are joined and conductive with the tips of the fifth and sixth legs inserted in different predetermined slots, and the other end is inserted in a slot different from the predetermined slot. It has a second bridge that joins and conducts with the tip of the leg. As a result, the coil of each phase can form the winding of the coil of each phase in four parallels with the two bridges of the first bridge and the second bridge, so that each phase can be wound without increasing the number of bridges of each phase. The number of parallel windings of the coil can be increased from 2 to 4.

10 Stator 20 Stator core 201 1st end face (one end face)
21 Teeth 22 Slot 30 Coil 30U U-phase coil 30V V-phase coil 30W W-phase coil 40 Segment conductor 401 Conductor 41 Leg 41a First end (one end)
411 1st leg 412 2nd leg 413 3rd leg 414 4th leg 415 5th leg 416 6th leg 417 7th leg 418 8th leg 43 Skew part 44 Tip 451 1st Joint 452 2nd joint 50U U phase leader line 50V V phase leader line 50W W phase leader line 51U 1st U phase leader line 51V 1st V phase leader line 51W 1W phase leader line 52U 2nd U phase leader line 52V 2nd V phase Leader 52W 2nd W Phase Leader 61U 1st U Phase Bridge (1st Bridge)
61V 1st V phase bridge (1st bridge)
61W 1W phase bridge (1st bridge)
62U Phase 2U Bridge (Second Bridge)
62V 2nd V phase bridge (2nd bridge)
62W 2nd W phase bridge (2nd bridge)
Lt Radial thickness Lw Circumferential width

Claims (6)

A substantially annular stator core having a plurality of teeth protruding inward in the radial direction at predetermined intervals along the circumferential direction and a plurality of slots that are spaces between the teeth adjacent to each other in the circumferential direction.
A coil having a plurality of segment conductors inserted into each of the plurality of slots.
Each said segment conductor
It has legs that are located inside the slot and extend substantially linearly in the axial direction.
One end of the leg in the axial direction protrudes outward from one end surface in the axial direction of the stator core, and extends obliquely in the first or second direction in the circumferential direction, and the skew portion. A tip portion extending outward in the axial direction from the tip end of the portion is formed.
Each of the plurality of slots is a stator of a rotary electric machine in which the legs of eight segment conductors are inserted in a radial direction.
Seen from the one end surface side in the axial direction of the stator core
The legs of the eight segment conductors inserted in the slots in a row in the radial direction are the first leg portion arranged in the first layer and the second leg portion arranged in the second layer, counting from the inside in the radial direction. Legs, 3rd legs arranged in the 3rd layer, 4th legs arranged in the 4th layer, 5th legs arranged in the 5th layer, 6th legs arranged in the 6th layer , Has a 7th leg arranged in the 7th layer and an 8th leg arranged in the 8th layer.
The oblique portion of the first leg portion and the second leg portion is oblique in the same direction of either the first direction or the second direction in the circumferential direction.
The oblique portion of the third leg portion and the fourth leg portion is the oblique portion of the first leg portion and the second leg portion of the first direction and the second direction in the circumferential direction. It is skewed in the opposite direction to
The oblique portion of the fifth leg portion and the sixth leg portion is oblique in the same direction of either the first direction or the second direction in the circumferential direction.
The slanted portion of the 7th leg portion and the 8th leg portion is oblique in the circumferential direction to the opposite side of the slanted portion of the 5th leg portion and the 6th leg portion of the rotary electric machine. Stator. The stator of the rotary electric machine according to claim 1.
The segment conductor has a conductor portion having a substantially rectangular cross section, and the aspect ratio represented by the radial thickness / circumferential width of the conductor portion is 0.5 or more and 0.7 or less. Stator. The stator of the rotary electric machine according to claim 1 or 2.
The coil has a U-phase coil, a V-phase coil, and a W-phase coil.
The U-phase coil is electrically connected to the U-phase leader, the V-phase coil is electrically connected to the V-phase leader, and the W-phase coil is electrically connected to the W-phase leader. And
The U-phase leader wire is provided in a first U-phase leader wire connected to the 7th leg portion inserted into the predetermined slot and the tip end portion of the 8th leg portion, and a slot different from the predetermined slot. It has a second U-phase leader wire that connects to the inserted 7th leg and the tip of the 8th leg.
The V-phase leader is a first V-phase leader that is inserted into a predetermined slot different from the U-phase leader and is connected to the tip of the seventh leg and the eighth leg, and the predetermined one. It has a 7th leg portion inserted into the slot different from the slot, and a 2nd V phase leader wire connected to the tip portion of the 8th leg portion.
The W-phase leader is the first W-phase connected to the 7th leg and the tip of the 8th leg inserted in a predetermined slot different from the U-phase leader and the V-phase leader. A stator of a rotary electric machine having a leader wire and a second W phase leader wire connected to the 7th leg portion and the tip end portion of the 8th leg portion inserted in the slot different from the predetermined slot. The stator of the rotary electric machine according to any one of claims 1 to 3.
The coil
The first leg and the tip of the second leg, and the third leg and the fourth leg inserted into the slots separated by a predetermined number in the first direction or the second direction in the circumferential direction. A first joint portion in which the four tip portions of the tip portion of the portion are integrally joined to conduct conduction,
The tip of the fifth leg and the sixth leg, and the seventh leg and the eighth leg inserted into the slots separated by a predetermined number in the first direction or the second direction in the circumferential direction. A stator of a rotary electric machine having a second joint portion in which the four tip portions of the tip portion of the leg portion are integrally joined to conduct conduction. The stator of the rotary electric machine according to claim 4.
The second leg portion, the third leg portion, and the tip portion of the fourth leg portion are bent so as to be inclined inward in the radial direction.
A stator of a rotary electric machine in which the fifth leg portion, the sixth leg portion, and the tip portion of the seventh leg portion are bent so as to be inclined outward in the radial direction. The stator of the rotary electric machine according to any one of claims 1 to 5.
The coil has a U-phase coil, a V-phase coil, and a W-phase coil.
The U-phase coil, the V-phase coil, and the W-phase coil are conductive by joining with the tip of the fifth leg and the sixth leg, each of which has one end inserted into the predetermined slot. A first bridge whose other end is joined to and conducts with the tip of the fifth leg and the sixth leg inserted in the slot different from the predetermined slot, and one end thereof. The slot that is connected to and conducts with the tip of the fifth leg and the sixth leg inserted in the predetermined slot different from the first bridge, and the other end is different from the predetermined slot. A stator of a rotary electric machine having a second bridge that joins and conducts with the tip of the fifth leg and the tip of the sixth leg inserted into the.

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