CN112928840A

CN112928840A - Generator stator and generator

Info

Publication number: CN112928840A
Application number: CN202110121358.XA
Authority: CN
Inventors: 闻汇; 施杨; 王文婷; 李华阳; 许移庆; 吴立建
Original assignee: Zhejiang University ZJU; Shanghai Electric Wind Power Group Co Ltd
Current assignee: Zhejiang University ZJU; Shanghai Electric Wind Power Group Co Ltd
Priority date: 2021-01-28
Filing date: 2021-01-28
Publication date: 2021-06-08
Anticipated expiration: 2041-01-28
Also published as: CN112928840B

Abstract

The application provides a generator stator and a generator. The generator stator includes a stator core and a plurality of stator windings. The stator core includes a cooling air duct. The plurality of stator windings are assembled in each stator slot, a ventilation gap is formed between each stator winding and at least one stator tooth adjacent to the stator winding in the tooth width direction, the cooling air channel comprises a first communicating port and a second communicating port which are communicated, the first communicating port is communicated with the ventilation gap, the second communicating port is communicated with a cavity in the hollow part of the stator core, one of the first communicating port and the second communicating port is an air inlet, the other one of the first communicating port and the second communicating port is an air outlet, the first communicating port and the second communicating port are at least partially staggered, and the ventilation gap is used for being communicated with an air gap between the generator stator and the generator rotor. When coolant flows to the second intercommunication mouth from first intercommunication mouth, can collide with cooling duct's inner wall, play the vortex effect, make coolant can flow more fully and mix from this, strengthen stator core's heat transfer effect.

Description

Generator stator and generator

Technical Field

The application relates to the technical field of generators, in particular to a generator stator and a generator.

Background

The temperature of each component of the generator is increased by copper loss, iron loss, eddy current loss of the permanent magnet, mechanical loss and the like generated in the running process of the generator, and the high temperature not only causes the performance reduction of the generator, but also causes the reliability problem. For example, high temperatures can cause increased resistance in the wires and decreased remanence in the permanent magnets, thereby causing a significant reduction in the power and efficiency of the permanent magnet machine. As another example, high temperatures can also cause significant degradation in insulation life and irreversible demagnetization of the permanent magnet.

The common generator cooling mode comprises liquid cooling and air cooling, the heat exchange coefficient of the liquid cooling is 1-2 orders of magnitude higher than that of the air cooling, however, the liquid cooling has a series of problems of leakage, insulation, water quality treatment and the like, so that the development of the liquid cooling is restricted, and the application and popularization are difficult. The air cooling has the advantages of high reliability, low cost, friendly maintenance and the like, and is widely applied, for example, the air cooling technology is adopted for offshore generators, aerospace generators and the like.

Disclosure of Invention

The application provides a generator stator and generator, can realize the effective heat dissipation of generator.

A first aspect of the present application provides a generator stator comprising:

the stator core is of a hollow columnar structure and comprises a cavity positioned in the hollow position, a plurality of stator teeth are formed on one side of the stator core facing the generator rotor, the plurality of stator teeth extend along the radial direction of the stator core and are distributed at intervals along the circumferential direction of the stator core, a plurality of stator slots are formed in a gap between every two adjacent stator teeth, and the stator core comprises a cooling air duct; and

the cooling air channel comprises a first communication port and a second communication port which are communicated, the first communication port is communicated with the ventilation gap, the second communication port is communicated with the cavity at the hollow position of the stator core, one of the first communication port and the second communication port is an air inlet, the other one of the first communication port and the second communication port is an air outlet, the first communication port and the second communication port are at least partially staggered, and the ventilation gap is used for being communicated with an air gap between the generator stator and the generator rotor.

A second aspect of the present application provides a generator comprising:

a generator stator as described in any of the above; and

the generator rotor is coaxial with the generator stator and can rotate relative to the generator stator, an air gap is formed between the generator rotor and the generator stator, and the ventilation gap is communicated with the air gap and the cooling air duct.

The technical scheme provided by the application can at least achieve the following beneficial effects:

the application provides a generator stator and generator, wherein, stator core includes cooling duct, stator winding and at least one adjacent with this stator winding be formed with the ventilation gap between the stator tooth, the cooling duct intercommunication the ventilation gap with stator core cavity department the cavity, and ventilation gap and air gap intercommunication. The ventilation gap can enable the stator winding to be directly contacted with the cooling medium, and the heat exchange effect is better. On the other hand, because first intercommunication mouth partially staggers with the second intercommunication mouth, when coolant flows to the second intercommunication mouth from first intercommunication mouth, collide with cooling duct's inner wall, play the vortex effect, make coolant can flow more fully and mix from this, be favorable to strengthening stator core's heat transfer effect.

Drawings

FIG. 1 is a half sectional view of a generator shown in an exemplary embodiment of the present application;

fig. 2 is an axial view of the stator core shown in fig. 1;

figure 3 is a schematic view of one of the lamination stacks of the stator core;

figure 4 is a schematic view of a part of the structure of the lamination stack shown in figure 3;

figure 5 is a schematic view of a first lamination of the lamination stack shown in figure 3;

figure 6 is a schematic view of a second lamination of the lamination stack shown in figure 3;

fig. 7 to 9 are schematic views of stator windings with ventilation gaps formed with teeth of laminations;

figure 10 is a schematic view of a further embodiment of the lamination stack;

FIG. 11 is a schematic view of yet another embodiment of a lamination stack;

FIG. 12 is a schematic view of the first and second laminations stacked to form an axial air duct;

FIG. 13 is a schematic view of yet another embodiment of a lamination stack;

figure 14 is a schematic view of a first lamination of the lamination stack shown in figure 13;

figure 15 is a schematic view of a second lamination of the lamination stack shown in figure 13;

figure 16 is a schematic view of a portion of the structure of the lamination stack shown in figure 13;

figure 17 is a schematic view of a further embodiment of the lamination stack;

figure 18 is a schematic view of a further embodiment of the lamination stack;

figure 19 is a schematic view of a first lamination of the lamination stack shown in figure 18;

figure 20 is a schematic view of a further embodiment of the lamination stack;

figure 21 is a schematic view of a first lamination of the lamination stack shown in figure 20;

FIG. 22 is a schematic view of yet another embodiment of a lamination stack;

figure 23 is a schematic view of a first lamination of the lamination stack shown in figure 22;

figure 24 is a schematic view of a further embodiment of the lamination stack;

figure 25 is a schematic view of a first lamination of the lamination stack shown in figure 24;

figure 26 is a schematic view of a further embodiment of the lamination stack;

figure 27 is a schematic view of a first lamination of the lamination stack shown in figure 26;

figure 28 is a schematic view of a second lamination of the lamination stack shown in figure 26;

FIG. 29 is a schematic view of a first lamination and a second lamination of a lamination stack shown in yet another embodiment;

figure 30 is a schematic view of a further embodiment of the lamination stack;

figure 31 is a schematic view of a first surface of the laminations of the lamination stack shown in figure 30;

figure 32 is a schematic view of a second surface of the laminations of the lamination stack shown in figure 30;

FIG. 33 is a schematic view of yet another embodiment of a lamination stack;

figure 34 is a schematic view of a first surface of the laminations of the lamination stack shown in figure 33;

figure 35 is a schematic view of a second surface of the laminations of the lamination stack shown in figure 33;

figure 36 is a schematic view of a further embodiment of the lamination stack;

figure 37 is a schematic view of one lamination of the lamination stack shown in figure 36;

FIG. 38 is a schematic view of yet another embodiment of a lamination stack;

FIG. 39 is a schematic view of one lamination of the lamination stack shown in FIG. 38;

FIG. 40 is a further half sectional view of the generator;

figure 41 is a schematic view of a portion of a stack of laminations in a stator core;

FIG. 42 is a further half sectional view of the generator;

FIG. 43 is a further half sectional view of the generator;

FIG. 44 is a schematic view of yet another embodiment of a lamination stack;

figure 45 is a schematic view of a first lamination of the lamination stack shown in figure 44;

figure 46 shows a schematic view of a second lamination of the lamination stack shown in figure 44;

figure 47 shows a schematic view of a third lamination of the lamination stack shown in figure 44;

FIG. 48 is a schematic view of yet another embodiment of a third lamination in the lamination stack shown in FIG. 44;

FIG. 49 is a schematic flow diagram of cooling medium A from the air gap to the cavity;

FIG. 50 is a further schematic flow of cooling medium A from the air gap to the cavity;

fig. 51 is a schematic view of a stator core partial structure;

FIG. 52 is a schematic view of the first lamination shown in FIG. 51;

FIG. 53 is a schematic view of the second lamination shown in FIG. 51;

figure 54 is a schematic view of a further embodiment of the lamination stack;

figure 55 is a schematic view of a further embodiment of the lamination stack;

figure 56 is a schematic view of a first lamination of the lamination stack shown in figure 55;

figure 57 is a schematic view of a second lamination of the lamination stack shown in figure 55;

fig. 58 is a schematic view of a stator core partial structure;

fig. 59 is yet another schematic view of a stator core segment construction;

figure 60 is a schematic view of yet another embodiment of a lamination stack;

figure 61 is a schematic view of a first lamination of the lamination stack shown in figure 60;

figure 62 is a schematic view of a second lamination of the lamination stack shown in figure 60;

figure 63 is yet another schematic view of the first lamination of the lamination stack shown in figure 60;

figure 64 is yet another schematic view of the second lamination of the lamination stack shown in figure 60.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with aspects of the present application.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Similarly, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one, and if only "a" or "an" is denoted individually. "plurality" or "a number" means two or more. Unless otherwise specified, "front", "back", "lower" and/or "upper", "top", "bottom", and the like are for ease of description only and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

Referring to fig. 1, fig. 1 is a half sectional view of a partial structure of a generator 1 according to an exemplary embodiment of the present application.

The embodiment of the application provides a generator 1, including generator stator 10 and generator rotor 20, generator rotor 20 and generator stator 10 coaxial arrangement, generator rotor 20 can rotate for generator stator 10 makes generator stator 10 produce the electric current, realizes that generator 1 generates electricity. The generator rotor 20 includes a rotor core 21 and a permanent magnet 22, and the permanent magnet 22 is disposed on a side of the rotor core 21 facing the generator stator 10, and an air gap 30 is reserved between the permanent magnet and the generator stator 10. The air gap 30 is an important part for realizing the electromechanical energy conversion, and simultaneously, a cooling medium A such as air can enter the interior of the generator 1 to cool the generator stator 10 and the generator rotor 20. In one embodiment, the cooling medium a enters the air gap 30 from both axial ends of the generator 1, passes through the generator stator 10, enters the cavity 10a in the generator stator 10, and is discharged from both end plates 50 distributed in the axial direction of the generator 1, thereby performing circulation cooling on the inside of the generator 1. The flow path of the cooling medium a may be further provided with a driving device and a heat exchanging device, such as an air-water heat exchanger with a fan, for driving the circulating flow of the cooling medium a and dissipating the heat absorbed by the cooling medium a. The flow direction of the cooling medium a is not limited to this.

In the embodiment shown in fig. 1, the generator stator 10 is provided as an inner stator, the generator stator 10 being located inside the generator rotor 20. In some other embodiments, the generator stator 10 may be an outer stator, and the generator stator 10 surrounds the generator rotor 20.

Referring to fig. 1 and 2 in combination, fig. 2 is an axial view of the stator core 100 shown in fig. 1.

The generator stator 10 includes a stator core 100 and a plurality of stator windings 102. The stator core 100 has a hollow cylindrical structure including a hollow 10a in a hollow portion. The stator core 100 includes a yoke 100a and a plurality of stator teeth 100b, and the yoke 100a is formed in a hollow cylindrical shape, and the hollow portion is a cavity 10 a. A plurality of said stator teeth 100b are formed adjacent to the air gap 30 on the side of said yoke 100a facing the generator rotor 20. The plurality of stator teeth 100b extend along the radial direction of the stator core 100 and are arranged along the circumferential direction of the stator core 100, and a gap between two adjacent stator teeth 100b forms a stator slot 100 c. The stator slot 100c is formed in plurality. In one embodiment, a plurality of stator windings 102 are assembled in each of the stator slots 100c and sleeved outside each of the stator teeth 100b in a one-to-one correspondence.

As shown in fig. 2, the stator core 100 includes a plurality of lamination stacks 200, and the specific number of lamination stacks 200 is not limited. The plurality of lamination stacks 200 are arranged in a hollow cylindrical structure, and the lamination stacks 200 are formed with stator teeth 100b and stator slots 100c on a side facing the generator rotor 20. It should be noted that the structure of the stator core 100 in fig. 2 is only schematic, the number of the stator teeth 100b in the actual generator 1 is much larger than that shown in fig. 2, for example, the number of teeth is 200 and 400 as is common in the direct-drive permanent magnet wind generator, and both the stator core 100 and the lamination stack 200 can be segmented along the circumferential direction.

Referring to fig. 3, fig. 3 is a schematic view of one of the lamination stacks 200 of the stator core 100.

The lamination stack 200 includes a plurality of laminations 201 stacked in a thickness direction, and the stacking direction of the plurality of laminations 201 is parallel to the axial direction of the stator core 100. Note that, for the rotating electric machine, the lamination stack 200 and the lamination 201 are both arc-shaped structures, and in the present application, for simplicity of drawing, the lamination stack 200 and the lamination 201 are both drawn as linear structures.

The lamination stack 200 is provided with a ventilation gap 400, the stator winding 102 and at least one of the stator teeth 100b adjacent to the stator winding 102 are formed with the ventilation gap 400 in the tooth width direction, and the ventilation gap 400 extends in the extending direction of the stator teeth 100 b. The stator core 100 includes a cooling air duct 300 (see fig. 1), the cooling air duct 300 communicates the ventilation gap 400 with the cavity 10a in the hollow of the stator core 100, and the ventilation gap 400 communicates with the air gap 30, so that the cooling medium a can circulate between the air gap 30 and the cavity 10 a. In one embodiment, after the cooling medium a enters the air gap 30, the cooling medium a may further flow to the hollow cavity 10a in the hollow of the stator core 100 along the ventilation gap 400 and the cooling air duct 300, and during the flowing process of the cooling medium a, the cooling medium a exchanges heat with the stator teeth 100b and the stator windings 102, and the cooling of the stator core 100 may be achieved. In particular, the stator teeth 100b and the stator winding 102 together enclose the ventilation gap 400, so that the stator winding 102 can be more fully and directly contacted with the cooling medium a, and the heat exchange effect is better. On the other hand, due to the arrangement of the ventilation gap 400 and the cooling air duct 300, the effective electromagnetic length loss caused by the arrangement of the traditional radial ventilation slots can be at least partially avoided, the magnetic field distortion on the stator core is effectively inhibited, and parasitic negative effects such as eddy current loss and the like are correspondingly weakened, so that the comprehensive optimization of the electromagnetic performance and the cooling effect of the generator is realized, and the upper limit of the torque density of the generator 1 is effectively improved.

In one embodiment, the stator winding 102 and at least one of the stator teeth 100b adjacent to the stator winding 102 are formed with a plurality of ventilation gaps 400 in the tooth width direction, and at least some of the ventilation gaps 400 are arranged along the axial direction of the stator core 100, which makes the distribution of the ventilation gaps 400 in the axial direction of the stator core 100 more distributed, so that a plurality of portions of the stator winding 102 can be directly contacted with the cooling medium a, so that the heat exchange area of the stator winding 102 is increased, and the cooling effect is further improved.

In an alternative embodiment, the stator winding 102 and one of the stator teeth 100b adjacent to the stator winding 102 are formed with a plurality of the ventilation gaps 400 in the tooth width direction, and the plurality of ventilation gaps 400 may be located on the same side of the stator winding 102 (refer to fig. 10) and arranged along the axial direction of the stator core 100. In yet another alternative embodiment, the stator winding 102 and the plurality of stator teeth 100b adjacent to the stator winding 102 leave a plurality of ventilation gaps 400 in the tooth width direction, the plurality of ventilation gaps 400 are respectively located on both sides of the stator winding 102 (refer to fig. 3), and the ventilation gaps 400 on each side are arranged along the axial direction of the stator core 100. The ventilation gap 400 may be arranged differently in different application scenarios.

Referring to fig. 4 to 6, fig. 4 is a schematic view of a partial structure of the lamination stack 200 shown in fig. 3. Fig. 5 and 6 are schematic views of the first lamination S1 and the second lamination S2 of the lamination stack 200 shown in fig. 3.

The lamination sheet 201 includes a yoke portion 201a and a tooth portion 201b connected to the yoke portion 201a, the tooth portion 201b is formed on a side of the yoke portion 201a facing the generator rotor 20, and the tooth portion 201b extends in a radial direction of the stator core 100. The tooth portions 201b of the plurality of lamination sheets 201 are stacked to form the stator teeth 100b, and the yoke portions 201a of the plurality of lamination sheets 201 are stacked to form the yoke 100 a.

The lamination sheet 201 may include a plurality of tooth portions 201b, the plurality of tooth portions 201b are arranged along a circumferential direction of the stator core 100, a gap between two adjacent tooth portions 201b forms a slot portion 201c, and the slot portions 201c of the plurality of lamination sheets 201 are stacked to form the stator slot 100 c. The lamination sheet 201 may be formed with a plurality of slot portions 201c, the plurality of slot portions 201c being arranged along a circumferential direction of the stator core 100, and the slot portions 201c of the plurality of lamination sheets 201 being stacked to form a plurality of stator slots 100 c.

The dashed line in fig. 5 illustrates the boundary line of the yoke portion 201a and the tooth portion 201b of the first lamination S1. The dashed line in fig. 6 illustrates the boundary line of the yoke portion 201a and the tooth portion 201b of the second lamination S2. The teeth 201b of each lamination 201 in the lamination group 200 are equal in size in the radial direction of the stator core 100, and the tips of the teeth 201b of each lamination 201 are aligned in the stacking direction (refer to fig. 3 and 4). The yoke portions 201a of the respective laminations 201 may or may not have the same size in the radial direction of the stator core 100.

In one embodiment, the first lamination S1 and the second lamination S2 in the lamination stack 200 may be the same lamination or different laminations, the latter being used in this embodiment. In addition, the first lamination S1 and the second lamination S2 may be adjacent to each other in the stacking direction, or may be separated by other laminations.

In one embodiment, ventilation gap 400 may be formed by stator winding 102 and laminations 201. Specifically, the plurality of laminations 201 includes a first lamination S1 and a second lamination S2, and the teeth 201b of the first lamination S1 and the teeth 201b of the second lamination S2 do not completely coincide in the tooth width direction in the stacking direction, so that the stator winding 102 may be formed with the ventilation gap 400 in the tooth width direction with the laminations 201. The ventilation gap 400 is formed in a simple manner. The manner in which the vent gap 400 is formed will be described in detail below with reference to the accompanying drawings.

Referring to fig. 7, fig. 7 is a schematic view of the ventilation gap 400 formed between the stator winding 102 and the lamination 201, wherein the view direction is a direction from the tooth 201b of the lamination 201 to the yoke 201 a.

In one embodiment, the teeth 201b of the first lamination S1 are offset from the teeth 201b of the second lamination S2 in the tooth width direction, and a projected area of the teeth 201b of the first lamination S1 is offset from a projected area of the teeth 201b of the second lamination S2 in the tooth width direction in an orthogonal projection in the stacking direction, so that the stator winding 102 may be formed with the lamination 201 with the ventilation gap 400 in the tooth width direction. The tooth widths of the teeth 201b of the first lamination S1 and the second lamination S2 may be equal to or different from each other.

The stator winding 102 is wound around the outside of the stator teeth 100b, the stator winding 102 includes a first winding portion 102 'and a second winding portion 102 ″ located on different sides of the teeth 201b of the first lamination sheet S1 and the second lamination sheet S2 in the tooth width direction, the first winding portion 102' is in contact with the teeth 201b of the first lamination sheet S1, a ventilation gap 400 is formed in the tooth width direction with the teeth 201b of the second lamination sheet S2, and the second stator winding 102 ″ is in contact with the teeth 201b of the second lamination sheet S2, and a ventilation gap 400 is formed with the teeth 201b of the first lamination sheet S1. The ventilation gaps 400 on both sides are staggered in the tooth width direction, and thus, are staggered in the axial direction of the stator core 100. In this embodiment, the stator teeth 100b may form ventilation gaps 400 with the stator winding 102 on both sides in the tooth width direction, so that the ventilation area and the heat exchange area are increased.

Referring to fig. 8 to 9, fig. 8 to 9 are further schematic views illustrating the ventilation gap 400 formed between the stator winding 102 and the lamination 201, wherein the view direction is a direction from the tooth portion 201b of the lamination 201 to the yoke portion 201 a.

In one embodiment, the tooth width of the tooth 201b of the first lamination S1 is larger than the tooth width of the tooth 201b of the second lamination S2, a projected area of the tooth 201b of the second lamination S2 is located within a projected area of the tooth 201b of the first lamination S1 in an orthographic projection in the stacking direction, and the tooth 201b of the second lamination S2 is staggered from the tooth 201b of the first lamination S1 on at least one side in the tooth width direction, so that the stator winding 102 and the lamination 201 can leave the ventilation gap 400 in the tooth width direction.

In the embodiment shown in fig. 8, the teeth 201b of the first lamination S1 are aligned with the teeth 201b of the second lamination S2 on one side in the tooth width direction and are offset on the other side, so that the stator winding 102 and the lamination 201 leave the ventilation gap 400 on one side in the tooth width direction. Specifically, the stator winding 102 includes first and second winding portions 102 'and 102 ″ located on different sides of the teeth 201b of the first and second laminations S1 and S2 in the tooth width direction, the first winding portion 102' being in contact with the teeth 201b of the first lamination S1, the teeth 201b of the second lamination S2 forming the ventilation gap 400 in the tooth width direction, and the second winding portion 102 ″ being in contact with the teeth 201b of the first and second laminations S1 and S2. In this embodiment, the teeth 201b of the first lamination S1 and the teeth 201b of the second lamination S2 may be aligned on the left side in the tooth width direction, and in other embodiments, the teeth 201b of the first lamination S1 and the teeth 201b of the second lamination S2 may be aligned on the right side in the tooth width direction.

In the embodiment shown in fig. 9, the teeth 201b of the first lamination S1 and the teeth 201b of the second lamination S2 are aligned along the center line of the tooth width, and the teeth 201b of the first lamination S1 and the teeth 201b of the second lamination S2 are staggered on both sides in the tooth width direction, so that the ventilation gaps 400 are left between the stator winding 102 and the laminations 201 on both sides in the tooth width direction. Specifically, the stator winding 102 includes a first winding portion 102 'and a second winding portion 102 ″ located on different sides of the teeth 201b of the first lamination S1 and the second lamination S2 in the tooth width direction, the first winding portion 102' is in contact with the teeth 201b of the first lamination S1, a ventilation gap 400 is formed with the teeth 201b of the second lamination S2, the second winding portion 102 ″ is in contact with the teeth 201b of the first lamination S1, a ventilation gap 400 is formed with the teeth 201b of the second lamination S2, and the stator winding 102 and the laminations 201 are formed with the ventilation gaps 400 on both sides in the tooth width direction, so that the ventilation area and the heat exchange area are increased.

Referring to fig. 10, fig. 10 is a schematic view of another embodiment of a lamination stack 200.

In the embodiment shown in fig. 10, the lamination stack 200 includes a plurality of first laminations S1 and a plurality of second laminations S2, the plurality of first laminations S1 and the plurality of second laminations S2 are arranged at intervals, and each first lamination S1 is adjacent to a second lamination S2. The tooth portion 201b of each second lamination S2 is aligned with the tooth portion 201b of the first lamination S1 on the same side in the tooth width direction, and the other side is staggered to form a plurality of ventilation gaps 400 on the same side of the stator tooth 100b, the plurality of ventilation gaps 400 being arranged in the axial direction.

Referring to fig. 11, fig. 11 is a schematic view of another embodiment of a lamination stack 200.

In the embodiment shown in fig. 11, the lamination stack 200 includes a plurality of first laminations S1 and a plurality of second laminations S2, the plurality of first laminations S1 and the plurality of second laminations S2 are arranged at intervals, and each first lamination S1 is adjacent to a second lamination S2. The teeth 201b of the first lamination S1 are aligned with the teeth 201b of the second lamination S2 on one side in the tooth width direction. For example, the tooth 201b of a portion of the first lamination S1 is aligned with the tooth 201b of the second lamination S2 at the left side in the tooth width direction, the tooth 201b of a portion of the first lamination S1 is aligned with the tooth 201b of the second lamination S2 at the right side in the tooth width direction to form a plurality of ventilation gaps 400, and the plurality of ventilation gaps 400 are respectively located at both sides of the stator teeth 100b, which makes the spatial distribution of the ventilation gaps 400 more uniform.

In the embodiment shown in fig. 10 and 11, a plurality of stator windings 102 and stator teeth 100b adjacent to each stator winding 102 form a plurality of ventilation gaps 400 in the tooth width direction, and the plurality of ventilation gaps 400 are distributed along the circumferential direction of the stator core 100.

It should be noted that, a stator winding 102 may be sleeved outside each stator tooth 100b, and then, each stator winding 102 may be adjacent to three stator teeth 100b, that is, the stator teeth 100b sleeved with the stator winding 102 and the stator teeth 100b located on both sides of the stator teeth 100 b.

Referring to fig. 1 again, the cooling air duct 300 includes a radial air duct 301 extending along the radial direction of the stator core 100 and an axial air duct 302 extending along the axial direction of the stator core 100, the radial air duct 301 is communicated with the axial air duct 302 and is communicated with the ventilation gap 400 and the cavity 10a in the hollow portion of the stator core 100, so that the cooling air duct 300 forms a bent air duct. The bent air duct structure is adopted, so that the cooling air duct 300 can be formed inside the stacked structure of the plurality of laminations 201, the arrangement is convenient, and a structural device for supporting the cooling air duct, for example, does not need to be arranged. On the other hand, the bent air duct structure can play a role of turbulence to a certain extent, so that the cooling medium a has relatively mild impact and mixing in the cooling air duct 300, and the cooling medium a and the generator stator 10 can be fully heat-exchanged on the premise of relatively small influence on the flow resistance.

In the embodiment shown in fig. 1, a plurality of cooling air ducts 300 are provided, the plurality of cooling air ducts 300 are arranged along the axial direction of the stator core 100 and along the circumferential direction of the stator core 100, and each cooling air duct 300 is communicated with the ventilation gap 400 and the cavity 10a in the hollow of the stator core 100. In other embodiments, the axial air channel 302 may extend through the lamination stack 200 (refer to fig. 4) along the axial direction of the stator core 100, so that the cooling medium a can be sufficiently mixed after entering the axial air channel 302, thereby enhancing the heat exchange effect.

Referring to fig. 4, 5, 6 and 12, fig. 12 is a schematic view illustrating the first lamination S1 and the second lamination S2 stacked to form the axial air duct 302.

Lamination stack 200 is provided with axial air channels 302. In one embodiment, at least one of the yoke portion 201a of the first lamination S1 and the yoke portion 201a of the second lamination S2 is provided with an opening 500 penetrating in the thickness direction, and the opening 500 forms an axial air duct 302, and the axial air duct 302 is formed in a simple manner.

Referring to fig. 12, in the radial direction of the stator core 100, the size of the yoke portion 201a of the second lamination S2 is smaller than that of the yoke portion 201a of the first lamination S1, wherein the yoke portion 201a of the first lamination S1 is provided with an opening 500 penetrating in the thickness direction, and in an orthographic projection in the stacking direction, a projection area of the opening 500 is located outside a projection area of the yoke portion 201a of the second lamination S2, so that the opening forms the axial air duct 302. In this embodiment, the gap is utilized as the axial air duct 302 by reducing the radial dimension of the yoke portion 201a of the second lamination S2 until the apertures 500 are exposed from the yoke portion 201a of the second lamination S2 to form the gap. This makes the structure of the second lamination S2 simple, the manufacturing convenient, and the material cost reduced, while not affecting the magnetic path of the yoke portion 201a of the second lamination S2.

In the embodiment shown in fig. 12, the opening 500 may be provided in plural, and the plural openings 500 are arranged in the circumferential direction of the stator core 100 at the yoke portion 201a of the first lamination S1, thereby forming the plural axial air ducts 302 to increase the flow rate of the cooling medium a through the axial air ducts 302. Moreover, since the radial dimension of the yoke portion 201a of the second lamination S2 is small, the plurality of axial air ducts 302 penetrate in the circumferential direction of the stator core 100, which is beneficial to the cooling medium a to be fully mixed in the circumferential direction in the axial air ducts 302, thereby reducing circumferential unevenness of the temperature of the stator core 100.

Referring to fig. 13-16, fig. 13 is a schematic view of another embodiment of a lamination stack 200. Fig. 14 and 15 show schematic views of the first lamination S1 and the second lamination S2 of the lamination stack shown in fig. 13. Fig. 16 is a schematic view showing a partial structure of the lamination stack 200 shown in fig. 13.

In one embodiment, the size of the yoke portion 201a of the first lamination S1 is equal to the size of the yoke portion 201a of the second lamination S2 in the radial direction of the stator core 100, and the yoke portion 201 of the first lamination S1 is flush with the yoke portion 201a of the second lamination S2 in the radial direction of the stator core 100. In this case, the yoke 201 of the first lamination S1 and the yoke 201a of the second lamination S2 may be provided with the opening 500 to form the axial air duct 302. Specifically, referring to fig. 14 and 15, the opening 500 includes a first opening 501 and a second opening 502, the yoke portion 201a of the first lamination S1 is provided with the first opening 501, the yoke portion 201a of the second lamination S2 is provided with the second opening 502, and in the stacking direction, the first opening 501 and the second opening 502 partially overlap, and the overlapping portion forms the axial air duct 302. In this embodiment, the axial air duct 302 is formed by the overlapping portion of the first opening 501 and the second opening 502, so that the sizes of the first opening 501 and the second opening 502 jointly determine the flow area of the axial air duct 302, and the shape and size of the axial air duct 302 are more diversified. The size and shape of the first opening 501 and the second opening 502 are not limited.

In one embodiment, the first opening 501 and the second opening 502 are provided in plural, the first opening 501 is arranged in the yoke portion 201a of the first lamination S1 along the circumferential direction of the stator core 100, the second opening 502 is arranged in the yoke portion 201a of the second lamination S2 along the circumferential direction of the stator core 100, and in the stacking direction, the first opening 501 and the second opening 502 correspond to each other one by one and partially overlap with each other, so that plural overlapping portions are formed, and thus plural axial air ducts 302 are formed, which increases the number of the axial air ducts 302, and further increases the flow rate of the cooling medium a through the axial air ducts 302.

Referring to fig. 1, 4 and 16, in an embodiment, the radial air duct 301 includes a winding-side radial segment 301a and a cavity-side radial segment 301b distributed on two sides of the axial air duct 302 in the radial direction and communicated with each other, the winding-side radial segment 301a communicates the ventilation gap 400 with the axial air duct 302, and the cavity-side radial segment 301b communicates the axial air duct 302 with the cavity 10a in the hollow of the stator core 100. In this embodiment, the winding-side radial segment 301a is disposed on a side of the axial air duct 302 close to the ventilation gap 400 for realizing communication between the ventilation gap 400 and the axial air duct 302, and the cavity-side radial segment 301b is disposed on a side of the axial air duct 302 close to the cavity 10a for realizing communication between the axial air duct 302 and the cavity 10a, so as to realize communication between the ventilation gap 400 and the cooling air duct 300, and enable the cooling medium a to flow from the air gap 30 to the cavity 10 a.

The lamination stack 200 is provided with a winding-side radial segment 301 a. In one embodiment, referring to fig. 5, the yoke portion 201a of the first lamination sheet S1 is provided with a slot communicating hole 600, the slot communicating hole 600 communicates the opening 500 with the slot 201c thereof, and the slot communicating hole 600 forms the winding-side radial segment 301a at one side of the yoke portion 201a of the second lamination sheet S2. The winding-side radial segment 301a is simple in structure and convenient to implement. Of course, the winding-side radial segment 301a is not limited to this.

In the embodiment shown in fig. 4 and 16, the plurality of lamination sheets 201 includes a plurality of first lamination sheets S1 and a plurality of second lamination sheets S2, the plurality of first lamination sheets S1 and the plurality of second lamination sheets S2 are spaced one by one, and each first lamination sheet S1 is adjacent to the second lamination sheet S2, thereby forming a plurality of winding-side radial segments 301a distributed in the axial direction of the stator core 100. The plurality of winding-side radial segments 301a can increase the flow rate of the cooling medium a, thereby increasing the heat dissipation area of the yoke 201a so that the plurality of laminations 201 can be sufficiently cooled.

In the embodiment shown in fig. 4 and 16, the winding-side radial segment 301a is equivalent to the gap at the slot communication hole 600 of the yoke portion 201a of the two second laminations S2 adjacent to the first lamination S1.

The slot communication hole 600 may be provided in plurality, and the plurality of slot communication holes 600 communicate with the plurality of slots 201c and the plurality of openings 500 in one-to-one correspondence, whereby the plurality of winding side radial segments 301a arranged in the circumferential direction of the stator core 100 may be formed.

Referring to fig. 17, fig. 17 is a schematic view of another embodiment of a lamination stack 200.

In one embodiment, the flow area of the single winding-side radial segment 301a is larger than the flow area of the single ventilation gap 400, and when the cooling medium a flows from the ventilation gap 400 to the winding-side radial segment 301a, the flow velocity is significantly reduced, which results in a reduction in the heat exchange effect, and meanwhile, if a sudden expansion structure is formed at a communication portion of the ventilation gap 400 and the winding-side radial segment 301a, a vortex region is formed downstream of the sudden expansion structure, which results in a large local flow resistance. Based on this, the laminated core 200 includes a projecting structure 301aa projecting from the inner wall of the winding side radial segment 301a, and the projecting direction of the projecting structure 301aa is different from the extending direction of the winding side radial segment 301 a. The protruding structure 301aa can play a role in turbulence, when the cooling medium A flows along the winding side radial section 301a, the cooling medium A collides with the protruding structure 301aa, so that the airflow in the winding side radial section 301a is disturbed, the flow speed and the turbulence of the cooling medium A can be increased, the heat exchange effect is enhanced, and meanwhile, the eddy region generated by the local sudden expansion structure is inhibited, so that the local flow resistance loss is reduced, and the heat exchange effect is enhanced. In this embodiment, the protruding structure 301aa is provided on at least one side wall of the first opening 501 of the first lamination S1 in the tooth width direction. The shape of the protruding structure 301aa is not limited, and may be circular arc, trapezoid, triangle, etc., but a sharp corner structure should be avoided as much as possible. The number of the protruding structures 301aa is not limited, and a plurality of protruding structures may be provided along the sidewall of the opening 500.

The lamination stack 200 is provided with a cavity-side radial segment 301 b. In one embodiment, as shown in fig. 4 to 6, in the radial direction of the stator core 100, the size of the yoke portion 201a of the second lamination S2 is smaller than that of the yoke portion 201a of the first lamination S1, and the yoke portion 201a of the second lamination S2 is arranged such that the side of the yoke portion 201a of the first lamination S1 facing the second lamination S2 forms a gap communicating the axial air duct 302 with the cavity 10a, and the channel communicating the axial air duct 302 with the cavity 10a forms the cavity-side radial segment 301 b. In this embodiment, since the radial dimension of the yoke portion 201a of the second lamination sheet S2 is small, the cavity-side radial segments 301b are communicated in the circumferential direction of the stator core 100, so that the flow area of a single cavity-side radial segment 301b is large, the cooling medium a can be sufficiently mixed in the cavity-side radial segment 301b, and the heat exchange effect is improved. The cavity-side radial segment 301b is formed in a manner not limited thereto.

The cavity side radial segment 301b may be formed in plural in the axial direction of the stator core 100. In the embodiment shown in fig. 4 and 16, the plurality of laminations 201 includes a plurality of first laminations S1 and a plurality of second laminations S2, the plurality of first laminations S1 and the plurality of second laminations S2 are spaced one by one, and each first lamination S1 is adjacent to a second lamination S2. This results in a void being formed in the yoke portion 201a of each first lamination S1 on the side facing the second lamination S2, thereby forming a plurality of axially distributed cavity-side radial segments 301 b.

In the embodiment shown in fig. 4, the cavity-side radial segment 301b is equivalent to a gap of the yoke portions 201a of two first laminations S1 adjacent to the second lamination S2 at an end remote from the tooth portion 201 b.

In another embodiment, as shown in fig. 14 to 16, in the radial direction of the stator core 100, the yoke portion 201a of the second lamination S2 has the same size as the yoke portion 201a of the first lamination S1, the yoke portion 201a of the second lamination S2 is provided with a through hole 600 'penetrating in the thickness direction, one end of the through hole 600' communicates with the cavity 10a, the other end terminates at the yoke portion 201a of the second lamination S2, the through hole 600 'communicates the axial air duct 302 with the cavity 10a, and the passage of the through hole 600' communicating the axial air duct 302 with the cavity 10a forms the cavity-side radial segment 301 b. In this embodiment, the cavity-side radial segment 301b may be formed by opening the cavity communication holes 600 'in the yoke portion 201a of the second lamination S2, and the shape and size of the cavity communication holes 600' are not limited, whereby the shape and size of the cavity-side radial segment 301b may be more diversified.

The cavity communication hole 600 'may be provided in the yoke portion 201a of the first lamination S1, but the position of the cavity communication hole 600' is determined by the groove portion communication hole 600. For example, when the yoke portion 201a of the first lamination S1 is provided with the slot communication hole 600, the cavity communication hole 600' is provided in the yoke portion 201a of the second lamination S2, or vice versa. The purpose of this arrangement is to prevent a significant decrease in the local flux dimension of the yoke portion 201a and a significant increase in the local magnetic resistance when the slot communication hole 600 and the cavity communication hole 600' are simultaneously provided on the same lamination 201.

The structure of the open hole 500 and the groove communication hole 600 is not limited in the present application. In one embodiment, referring to fig. 5, an opening hole 500 and a slot communicating hole 600 are formed in a portion of the yoke portion 201a radially opposite to the slot portion 201c, and the yoke portion 201a forms a hole penetrating in a slot width direction at the opening hole 500 and the slot communicating hole 600. The widths of the opening 500 and the groove communication hole 600 may be equal to or different from the width of the groove 201 c. In the present embodiment, with the former, this can make the flow area of the winding-side radial segment 301a larger than the flow area of the ventilation gap 400.

Referring to fig. 18 and 19, fig. 18 is a schematic view of another embodiment of a lamination stack 200. Fig. 19 shows a schematic view of the first lamination S1 of the lamination stack shown in fig. 18.

In one embodiment, the opening hole 500 and the groove communication hole 600 are respectively provided on both sides of the same tooth portion 201b of the first lamination S1 in the tooth width direction, and the size of the opening hole 500 and the groove communication hole 600 in the tooth width direction is smaller than the size of the groove portion 201c in the tooth width direction. With this arrangement, the sizes of the open holes 500 and the slot communicating holes 600 in the tooth width direction are reduced, which increases the solid area of the yoke portion 201a of the first lamination S1, and accordingly, the hollow area of the yoke portion 201a of the first lamination S1 is reduced, and the structural strength of the first lamination S1 is improved, particularly at the portion of the yoke portion 201a near the slot portion 201 c. Further, the flow area of the winding-side radial segment 301a formed by the groove communication holes 600 is reduced, so that the difference in flow area between the winding-side radial segment 301a and the ventilation gap 400 can be reduced, the coolant a can flow at a high speed in the winding-side radial segment 301a, and the heat exchange effect can be ensured. In addition, the open hole 500 and the slot communication hole 600 in this embodiment may be used as a magnetic isolation bridge for eliminating a part of harmonics and reducing eddy current loss of the generator stator 10 and the generator rotor 20. The modulation effect of the magnetic isolation bridge is utilized to be beneficial to improving the torque of the generator 1.

Referring to fig. 20 and 21, fig. 20 is a schematic view of another embodiment of a lamination stack 200. Fig. 21 shows a schematic view of the first lamination S1 of the lamination stack shown in fig. 20.

In some embodiments, first lamination S1 includes a plurality of teeth 201b, the plurality of teeth 201b including a first tooth 201b ', a second tooth 201b ", and a third tooth 201 b'", wherein first tooth 201b 'is separated from second tooth 201b "by at least one third tooth 201 b'". Both sides in the tooth width direction of the first tooth portion 201b 'are provided with the open hole 500 and the slot communication hole 600, respectively, and both sides in the tooth width direction of the second tooth portion 201b "are provided with the open hole 500 and the slot communication hole 600, respectively, thereby allowing the winding-side radial segment 301a and the axial air passage 302 to be distributed on both sides of the first tooth portion 201 b' and the second tooth portion 201 b". The lamination stack 200 may be applied in a generator comprising a main stator winding and a back-up stator winding. For example, some stator windings 102 that operate for a long time are main stator windings and can be sleeved on the first tooth portion 201 b' or the second tooth portion 201b ″, so that the cooling medium a can flow into the ventilation gap 400, the slot communication holes 600 and the openings 500, and cooling of the main stator windings can be effectively enhanced; the other stator windings 102 are used as standby windings, and when the stator windings are used, the characteristics of short working time, small load and small high ring temperature probability exist, and the cooling requirement is less than that of the main stator windings, so that the standby windings can be sleeved on the third tooth part 201b '″, and thus, a ventilation gap 400 can be arranged between the third tooth part 201 b' ″ and the stator windings 102 less or not at all. In the embodiment shown in fig. 21, the tooth widths of the plurality of teeth 201b of the first lamination S1 are not equal. Alternatively, the tooth widths of the first tooth 201b 'and the second tooth 201b ″ are smaller than the tooth width of the tooth 201b of the second lamination S1, and the tooth width of the third tooth 201 b' ″ is equal to the tooth width of the tooth 201b of the second lamination S1. Among them, the tooth widths of the plurality of teeth 201b of the second lamination S1 may be equal.

In addition, the way of sleeving the stator winding 102 on the stator teeth 100b is not limited, and a double-layer centralized type or a single-layer centralized type may be adopted. The single-layer centralized type means that every other stator tooth 100b is sleeved with one stator winding 102, and one coil side of the stator winding 102 is accommodated in each stator slot 100 c. The double-layer centralized type means that each stator tooth 100b is sleeved with one stator winding 102, and two coil sides of different stator windings 102 are accommodated in each stator slot 100 c. In an alternative embodiment, as shown in fig. 20, a single-layer centralized type may be adopted, and the stator winding 102 is preferably sleeved on the stator teeth 100 b' with the same tooth width in the first lamination sheet S1 and the second lamination sheet S2, so that after the arrangement, on one hand, the structure of the stator teeth 100b sleeved on the stator winding 102 is the same as the tooth shape of the conventional stator teeth, the installation is convenient, and the requirement on the assembly precision of the stator teeth 100b not sleeved on the stator winding 102 is not high; on the other hand, when a gap is left between the stator winding 102 and the stator teeth 100b without the stator winding 102, that is, a gap is also left between the stator winding 102 and the ventilation gap 400, the cooling medium a can also axially flow along the gap and then enter the ventilation gap 400, so that the flow mixing of axial flow and radial flow is enhanced, and the heat exchange is enhanced; in a third aspect, the motor is less prone to clogging of the vent gap 400 during the vacuum dip process.

Referring to fig. 22 and 23, fig. 22 is a schematic view of another embodiment of a lamination stack 200. Fig. 23 shows a schematic view of the first lamination S1 of the lamination stack shown in fig. 22.

In one embodiment, the opening 500 and the groove communication hole 600 are provided on one side of the same tooth portion 201b in the tooth width direction, and the size of the opening 500 and the groove communication hole 600 in the tooth width direction is smaller than that of the groove portion 201c in the tooth width direction. In this embodiment, the sizes of the open holes 500 and the groove communication holes 600 are small in the tooth width direction, and the number of the open holes 500 and the groove communication holes 600 is small, so that the structural strength of the first lamination S1 is further improved.

In the embodiment shown in fig. 18, 20 and 22, the second lamination S2 may be the second lamination S2 shown in fig. 5, but is not limited thereto.

Referring to fig. 24 and 25, fig. 24 is a schematic view of another embodiment of a lamination stack 200. Fig. 25 shows a schematic view of the first lamination S1 of the lamination stack shown in fig. 24.

The bottom corner of the opening 500 is provided with a fillet C1, and the fillet C1 can make the magnetic path of the first lamination S1 at the opening 500 smoother, thereby reducing the magnetic resistance near the opening 500 and reducing the magnetic flux leakage and iron loss caused by the bottom of the opening 500.

In some embodiments, the width of the opening 500 may be gradually decreased in a radial direction from the tooth 201b toward the yoke 201a, so that the size of the opening 500 is decreased, the effective magnetic running width is increased, and thus the magnetic path resistance may be further decreased.

Referring to fig. 26-28, fig. 26 is a schematic view of another embodiment of a lamination stack 200. Fig. 27 shows a schematic view of the first lamination S1 of the lamination stack shown in fig. 26. Fig. 28 shows a schematic view of the second lamination S2 of the lamination stack shown in fig. 26.

In order to ensure that the plurality of laminations 201 in the lamination stack 200 are completely fixed in the axial direction of the stator core 100 and achieve a high lamination ratio, the lamination stack 200 may include a compression structure (not shown) which compresses the plurality of laminations 201 in the stacking direction.

In one embodiment, the yoke portions 201a of the first and second lamination sheets S1 and S2 are provided with coupling holes 201ad, each of the coupling holes 201ad is coaxially disposed, and the compressing structure includes a coupling member assembled in the coupling hole 201ad and finger-pressure plates at both axial ends of the stator core 100, both ends of the coupling member being coupled with the finger-pressure plates to compress the plurality of lamination sheets 201 in the stacking direction. The connector may include a tension screw, but is not limited thereto.

Since the yoke portion 201a of the first lamination S1 is provided with the opening 500, the arrangement of the coupling holes 201ad has a large influence on the magnetic circuit of the first lamination S1, easily causing an increase in the magnetic resistance of the first lamination S1. In order to reduce the reluctance of the first lamination S1, a widened portion 800 may be provided on the yoke portion 201a of the first lamination S1, the widened portion 800 may be provided at least one side of the coupling hole 201ad in the tooth width direction, and the widened portion 800 may increase the width dimension of the yoke portion 201a of the first lamination S1 at the coupling hole 201ad to compensate for the area of the yoke portion 201a of the first lamination S1 at the coupling hole 201ad, thereby reducing the reluctance.

Referring again to fig. 13 to 15, the lamination stack 200 includes a radial tension structure, and the plurality of laminations 201 apply a radial tension force through the radial tension structure to position the plurality of laminations 201 in a radial direction of the stator core 100. The embodiment of the radial tensioning structure is not limited. In one embodiment, lamination stack 200 includes a detent 700. Specifically, the first lamination S1 and the second lamination S2 have the same size in the radial direction of the stator core 100, the yokes 201a of the two are kept flush, the yoke 201a of the first lamination S1 is provided with a first positioning groove 201aa, the yoke 201a of the second lamination S2 is provided with a second positioning groove 201aa ', and the first positioning groove 201aa and the second positioning groove 201 aa' correspond in the stacking direction to form a positioning groove 700 that penetrates in the axial direction. The radial tensioning arrangement may include a locating bracket (not shown) at least partially assembled within the locating slot 700 to radially locate the plurality of laminations 201. The shape of the positioning groove 700 is not limited, in this embodiment, the positioning groove 700 is a positioning groove with a dovetail structure, and correspondingly, the positioning bracket can be a positioning bracket with a dovetail structure, but is not limited thereto.

Referring to fig. 29, fig. 29 is a schematic view of a first lamination S1 and a second lamination S2 in a stacked state in a lamination stack 200 according to still another embodiment.

In one embodiment, the lamination stack 200 includes first laminations S1, second laminations S2, and a support structure 900, wherein the first laminations S1 have a larger dimension in the radial direction of the stator core 100 than the second laminations S2 in that direction, and the support structure 900 supports the yoke portion 201a of the first laminations S1 in the axial direction of the stator core 100 to increase the strength of the yoke portion 201 a. The support structure 900 may be provided in plurality, arranged in the circumferential and axial directions of the stator core 100, thereby achieving multi-point support of the yoke portion 201a of the first lamination S1. In one embodiment, the support structure 900 may be supported on a side of the first lamination S1 where the yoke 201a is located. When the cooling medium a flows along the winding-side radial segment 301a, the axial air duct 302 and the cavity-side radial segment 301b, since the plurality of winding-side radial segments 301a and the plurality of axial air ducts 302 are circumferentially distributed at intervals, and the cavity-side radial segment 301b is circumferentially communicated, the cooling medium a flows and expands when flowing into the cavity-side radial segment 301b from the axial air duct 302, the flow rate near the center of the expanding flow is high, and the flow rates on both sides away from the center are low, so that the support structure 900 is away from the tooth portion 201b, the central position of the expanding flow can be avoided, the formation of large resistance to the flow of the cooling medium a is avoided, and the obstruction of the support structure 900 to the cooling medium a flowing from the axial air duct 302 to the cavity-side radial segment 301b is minimized.

In one embodiment, the plurality of laminations 201 includes a plurality of first laminations S1 and a plurality of second laminations S2, the plurality of first laminations S1 and the plurality of second laminations S2 are spaced one by one, and each first lamination S1 is adjacent to a second lamination S2. At this time, the support structure 900 may be disposed between the yokes 201a of the two first laminations S1 adjacent to the second lamination S2. The specific structure of the supporting structure 900 is not limited, and may be selected according to actual requirements, for example, an i-shaped steel may be used.

Referring to fig. 30 to 32, fig. 30 is a schematic view showing a partial structure of another lamination stack 200. Figure 31 is a schematic view of a first surface of laminations 201 of lamination stack 200 shown in figure 30. Figure 32 is a schematic view of a second surface of laminations 201 of lamination stack 200 shown in figure 30.

In one embodiment, the lamination stack 200 includes a plurality of identical laminations 201 stacked in the thickness direction, which makes the processing, manufacturing and assembling of the lamination stack 200 easier and more convenient due to the identical laminations 201, and the manufacturing cost is low, and no material confusion is caused during the stacking process.

The lamination sheet 201 includes a yoke portion 201a and a plurality of tooth portions 201b connected to the yoke portion 201a, a plurality of groove portions 201c are formed in a gap between two adjacent tooth portions 201b, and the plurality of groove portions 201c include a first groove portion 201ca and a second groove portion 201 cb. The yoke portion 201a includes a first slot 201ab and a second slot 201ac penetrating in the thickness direction and extending in the radial direction of the stator core 100, and one end of the first slot 201ab communicates with the first slot portion 201ca, and the other end is stopped at the yoke portion 201a to form a first stopped end 201 ab'. One end of the second slot 201ac is communicated with the cavity 10a, and the other end is stopped at the yoke portion 201a to form a second stopping end 201ac ', and the second stopping end 201ac ' is closer to the tooth portion 201b than the first stopping end 201ab ' along the radial direction of the stator core 100. In this embodiment, the first slots 201ab and the second slots 201ac are formed in the lamination 201, so that a plurality of identical laminations 201 can be stacked to form the cooling air duct 300, thereby cooling the stator core 100.

In the embodiment shown in fig. 31, the first open groove 201ab is equivalent to the first opening hole 501 and the groove communication hole 600 in fig. 14, and the second open groove 201ac is equivalent to the second opening hole 502 and the cavity communication hole 600' in fig. 15.

In the embodiment shown in fig. 31, the groove portion 201c includes a plurality of first groove portions 201ca and a plurality of second groove portions 201cb, the plurality of first groove portions 201ca and the plurality of second groove portions 201cb are arranged at intervals one by one, the plurality of first open grooves 201ab are provided in one-to-one correspondence with the first groove portions 201ca, and the plurality of second open grooves 201ac are provided in one-to-one correspondence with the second groove portions 201 cb. By increasing the number of the first slots 201ab and the second slots 201ac, a greater number of cooling air ducts 300 can be formed in the laminated sheet stack 200, so that the stator core 100 can be sufficiently cooled. "the first groove portion 201ca and the plurality of second groove portions 201cb are arranged at intervals one by one" means that each of the first groove portions 201ca is adjacent to the second groove portion 201 cb.

In one embodiment, the groove widths of the first groove portions 201ca are equal, the groove widths of the second groove portions 201cb are equal, the groove widths of the first groove portions 201ab are equal, and the groove widths of the second groove portions 201ac are equal.

In the embodiment shown in fig. 30, the cooling air duct 300 includes a radial air duct 301 extending in the radial direction of the stator core 100 and an axial air duct 302 extending in the axial direction of the stator core 100, the axial air duct 302 includes a first axial air duct 302a, and the radial air duct 301 communicates with the first axial air duct 302a to form a bent air duct structure. In the embodiment shown in fig. 30, the ventilation gap 400, the radial air passage 301, the first axial air passage 302a, and the cavity 10a in the hollow of the stator core 100 communicate with each other, so that the cooling medium a can circulate between the air gap 30 and the cavity 10 a.

The first axial air channel 302a is formed in an unlimited manner. In one embodiment, as shown in fig. 30, the plurality of laminations 201 includes a first lamination S1 and a second lamination S2, wherein the first lamination S1 and the second lamination S2 are identical. In the stacking direction, the first slots 201ab of the first laminations S1 partially coincide with the second slots 201ac of the second laminations S2, the coinciding portions forming the first axial ducts 302.

The first lamination S1 and the second lamination S2 are stacked in an unlimited manner. In one embodiment, as shown in fig. 31 and 32, laminations 201 include first and second thickness-wise opposed surfaces B, B', the first surface B of the first lamination S1 being in contact with the first surface B of the second lamination S2, the first slot 201ab of the first lamination S1 being partially coincident with the second slot 201ac of the second lamination S2 in the stacking direction, the coincident portions forming the first axial air channel 302a, and the stack 200 stacked in this manner is shown in fig. 30. In this embodiment, the first lamination S1 and the second lamination S2 are stacked in a positive-negative manner to form the first axial duct 302, and the stacking manner is more varied.

The number of teeth 201b of the lamination 201 may be an even number or an odd number. When an even number of the teeth 201b are provided, the teeth 201b of the first lamination S1 and the teeth 201b of the second lamination S2 need to be shifted by at least one tooth 201b in the circumferential direction of the stator core 100 so that the first slot 201ab and the second slot 201ac partially coincide.

In the present embodiment, the number of the teeth 201b is set to be odd. The number of the teeth 201b may be three, five, seven, nine, etc., and is not particularly limited. When the lamination 201 is provided with an odd number of the teeth 201B, the first surface B of the first lamination S1 is in contact with the first surface B of the second lamination S2, and the teeth 201B in the middle of the first lamination S1 are stacked with the teeth 201B in the middle of the second lamination S2. After being stacked in this way, the teeth 201b of the first lamination S1 can be stacked in one-to-one correspondence with the teeth 201b of the second lamination S2, respectively, without any tooth 201b being shifted, so that the stacked structure of the lamination group 200 is more compact and neat, and the strength at both ends in the circumferential direction is higher. In addition, after adopting this kind of structure, can directly realize stator core 100's modularization, be about to stator core 100 carries out the split along circumference for overcome the difficult whole circle of major diameter stator closed assembly, the difficulty of inconvenient transportation.

In one embodiment, as shown in fig. 31, the plurality of teeth 201b includes a first tooth 201b 'and a second tooth 201b ", a tooth width of the first tooth 201 b' is equal to a tooth width of the second tooth 201 b", the first tooth 201b 'of the first lamination is stacked on the first tooth 201 b' of the second lamination, and a projected area of the first tooth 201b 'of the first lamination S1 and a projected area of the first tooth 201 b' of the second lamination S2 do not completely overlap in the tooth width direction in an orthogonal projection in the stacking direction. In this way, a ventilation gap 400 may be formed with stator windings 102 at a location that is not coincident.

In one embodiment, the groove width of the first groove portion 201ca is different from the groove width of the second groove portion 201cb, the first groove portion 201ca of the first lamination S1 corresponds to the second groove portion 201cb of the second lamination S2 in the stacking direction, and in a forward projection in the stacking direction, a projection area of a smaller groove width is located in a projection area of a larger groove width. In this way, when the first tooth portion 201b 'of the first lamination S1 and the first tooth portion 201 b' of the second lamination S2 are shifted in the tooth width direction, the smaller one of the first slot portion 201ca and the second slot portion 201cb is not blocked, and the space for assembling the stator winding 102 can still be secured. At this time, the smaller of the slot widths of the first slot portion 201ca and the second slot portion 201cb is used for assembling the stator winding 102.

In the embodiment shown in fig. 31, the slot portion 201c includes a plurality of first slot portions 201ca and a plurality of second slot portions 201cb, the plurality of first slot portions 201ca and the plurality of second slot portions 201cb are arranged at intervals one by one, each first slot portion 201ca is adjacent to the second slot portion 201cb, and the slot width of the first slot portion 201ca is larger than that of the second slot portion 201cb, and the second slot portion 201cb is used for assembling the stator winding 102.

In the embodiment shown in fig. 30, the plurality of laminations 201 includes a plurality of first laminations S1 and a plurality of second laminations S2, the plurality of first laminations S1 and the plurality of second laminations S2 are spaced one by one, and each first lamination S1 is adjacent to the second lamination S2 to penetrate the axial air duct 302 in the stacking direction.

Referring to fig. 33-35, fig. 33 is a schematic view of another lamination stack 200. Fig. 34 is a schematic view of the first surface of the first lamination S1 of fig. 33. Fig. 35 is a schematic view of a second surface of the second laminate S2 of fig. 33. Wherein the first lamination S1 and the second lamination S2 in the lamination stack 200 are the same lamination.

The lamination sheet 201 includes a yoke portion 201a and a plurality of tooth portions 201b connected to the yoke portion 201a, a plurality of groove portions 201c are formed in a gap between two adjacent tooth portions 201b, and the plurality of groove portions 201c include a first groove portion 201ca and a second groove portion 201 cb. The yoke portion 201a includes a first slot 201ab and a second slot 201ac penetrating in the thickness direction and extending in the radial direction of the stator core 100, and one end of the first slot 201ab communicates with the first slot portion 201ca, and the other end is stopped at the yoke portion 201a to form a first stopped end 201 ab'. One end of the second slot 201ac is communicated with the cavity 10a, and the other end is stopped at the yoke 201a to form a second stopping end 201 ac'. The second cut-off end 201ac 'is closer to the tooth 201b than the first cut-off end 201 ab' in the radial direction of the stator core 100. The first axial air duct 302a is formed in a manner substantially similar to that of the first axial air duct 302a shown in fig. 30, and is not described herein again.

In one embodiment, the lamination sheet 201 includes a first surface B and a second surface B 'opposite in a thickness direction, the first surface B of the first lamination sheet S1 being in contact with the second surface B' of the second lamination sheet S2, and the first lamination sheet S1 and the second lamination sheet S2 are staggered in the circumferential direction of the stator core 100 by at least one of the teeth 201B. In this embodiment, another stacking manner of a plurality of same laminations 201 is provided, so that the stacking manner is more diversified, and further, the stacking structure of the lamination set 200 is more diversified, so as to meet the use requirements in different application scenarios.

Referring to fig. 34, in one embodiment, the plurality of teeth 201b includes a first tooth 201b ' and a second tooth 201b ", a tooth width of the first tooth 201b ' is different from a tooth width of the second tooth 201 b", the first tooth 201b ' of the first lamination S1 is stacked with the second tooth 201b "of the second lamination S2, and a projection area of a smaller tooth width is located in a projection area of a larger tooth width in a tooth width direction in an orthogonal projection along the stacking direction. In this way, it is ensured that the smaller tooth width and the stator winding 102 can form said ventilation gap 400 on at least one side. For example, the smaller tooth width is aligned with the larger tooth width on one side in the tooth width direction, and the smaller tooth width forms the ventilation gap 400 with the stator winding 102 on one side in the tooth width direction. Alternatively, the smaller tooth width is aligned with the larger tooth width along the centerline of the tooth width, and the smaller tooth width forms the ventilation gap 400 with both sides of the stator winding 102 in the tooth width direction.

In one embodiment, the groove width of the first groove portion 201ca is equal to the groove width of the second groove portion 201cb, and the first groove portion 201ca of the first lamination S1 is stacked with the second groove portion 201cb of the second lamination S2. The stator winding 102 is assembled in the stator slot 100c formed by stacking the first slot portion 201ca and the second slot portion 201 cb.

In the embodiment shown in fig. 33 and 35, the lamination sheets 201 include a plurality of first lamination sheets S1 and a plurality of second lamination sheets S2, the plurality of first lamination sheets S1 and the plurality of second lamination sheets S2 are arranged at intervals one by one, the first teeth 201 b' of the first lamination sheets S1 are stacked with the second teeth 201b ″ of the second lamination sheets S2, and the first lamination sheets S1 and the second lamination sheets S2 are staggered by one tooth 201b in the circumferential direction of the stator core 100. The "plurality of first laminations S1 and the plurality of second laminations S2 are arranged one by one at intervals" means that each first lamination S1 is adjacent to the second lamination S2.

Referring to fig. 36-37, fig. 36 is a schematic view of another lamination stack 200. Fig. 37 is a schematic view of the laminate 201 shown in fig. 36. Wherein each lamination 201 is the same lamination.

In one embodiment, the cooling air duct 300 includes a second axial air duct 302b extending along the axial direction of the stator core 100, the first axial air duct 302a and the second axial air duct 302b are distributed at intervals along the radial direction of the stator core 100, the first axial air duct 302a communicates the radial air duct 301 with the cavity 10a, and the second axial air duct 302b communicates the ventilation gap 400 with the radial air duct 301. The first axial air duct 302a and the second axial air duct 302b increase the number of axial air ducts of the stator core 100, and accordingly increase the axial ventilation amount, so that the cooling medium a can be sufficiently mixed in the cooling air duct 300. The axial air duct 302 includes a first axial air duct 302a and a second axial air duct 302 b.

In one embodiment, one end of the first slot portion 201ca communicating with the first slot 201ab includes an enlarged portion 201cc, a dimension of the enlarged portion 201cc in the tooth width direction is larger than a dimension of the stator winding 102 in this direction, and a gap between the enlarged portion 201cc and the stator winding 102 forms the second axial air passage 302 b. The specific structure of the amplification part 201cc is not limited, and can be selected and arranged according to actual requirements. In this embodiment, the amplification part 201cc is a strip-shaped hole, and communicates the first groove 201ca with the first open groove 201 ab.

Referring to fig. 31 and fig. 36, the radial air duct 301 includes a winding-side radial segment 301a and a cavity-side radial segment 301b, the winding-side radial segment 301a communicates with the first axial air duct 302a and the second axial air duct 302b, the cavity-side radial segment 301b communicates with the first axial air duct 302a and the cavity 10a in the hollow of the stator core 100, and the second axial air duct 302b communicates with the ventilation gap 400. In this embodiment, the winding-side radial segment 301a and the cavity-side radial segment 301b realize the segmented communication of the radial air duct 301, so as to realize the arrangement and communication of the first axial air duct 302a and the second axial air duct 302 b.

In one embodiment, the first slots 201ab of the first laminations S1 form a space communicating the first axial airduct 302a with the second axial airduct 302b on a side of the yoke portion 201a of the second laminations S2 facing the first laminations S1, the passage of the space communicating the first and second axial airducts forming the winding-side radial segment 301 a.

In one embodiment, the second slots 201cb of the first laminations S1 form a space communicating the first axial ducts 302a with the cavity 10a on a side of the yoke portion 201a of the second laminations S2 facing the first laminations S1, the space communicating the first axial ducts 302a with the cavity 10a, the passage of the space communicating the first axial ducts 302a with the cavity 10a forming the cavity-side radial segment 301 b.

The winding-side radial segment 301a is formed by the first slot 201ab, and the formation manner is simple, and the communication with the first axial air duct 302a and the second axial air duct 302b is conveniently realized. The cavity-side radial segment 301b is formed by the second slot 201cb, is formed in a simple manner, and facilitates communication with the first axial air passage 302a and the cavity 10 a. The winding-side radial segment 301a shown in fig. 30 is formed in substantially the same manner as the winding-side radial segment 301a shown in fig. 36, and the cavity-side radial segment 301b shown in fig. 30 is formed in substantially the same manner as the cavity-side radial segment 301b shown in fig. 36.

The structure of the first slot 201ab is not limited in this application. In the embodiment shown in fig. 31 and 34, a first open groove 201ab is opened in a part of the yoke portion 201a radially opposed to the groove portion 201c, and the yoke portion 201a forms a hole penetrating in the groove width direction at the first open groove 201 ab. For example, the width of the first open groove 201ab may be equal to the width of the first groove 201ca, or may be different from the width of the first groove 201 ca. In this embodiment, the former is adopted. This way, the flow area of the winding-side radial segment 301a in the stator lamination 200 is larger than the flow area of the ventilation gap 400. According to the foregoing, the protruding structure 301aa for turbulent flow may be provided on the inner wall of the winding-side radial segment 301a, which is not described herein again.

Referring to fig. 38 and 39, fig. 38 is a schematic view of yet another lamination stack 200. Figure 39 is a schematic view of laminations 201 of lamination stack 200 shown in figure 38. Wherein each lamination 201 of lamination stack 200 is the same lamination.

In one embodiment, a first slot 201ab may be further disposed on at least one side of the first slot 201ca in the slot width direction, one end of the first slot 201ab is communicated with the first slot 201ca, and the other end is terminated at the yoke portion 201a, and the slot width of the first slot 201ab is smaller than that of the first slot 201ca, so as to form a strip-shaped gap. Accordingly, the second slot 201ac may be opened at least one side of the second slot portion 210cb in the slot width direction, one end of the second slot 201ac is communicated with the cavity 10a, and the other end is stopped at the yoke portion 201a, and the slot width of the second slot 201ac is smaller than the slot width of the second slot portion 210 cb. As such, the dimension of first slot 201ab in the tooth width direction is reduced, which results in an increase in the structural strength of lamination 201. In addition, the arrangement can reduce the flow area of the single winding side radial section 301a, so as to reduce the difference between the flow areas of the winding side radial section 301a and the ventilation gap 400, improve the flow velocity of the cooling medium a in the winding side radial section 301a, and ensure the heat exchange effect.

In the embodiment shown in fig. 39, two sides of the first groove portion 201ca in the groove width direction are respectively provided with a first open groove 201ab, two sides of the second groove portion 210cb in the groove width direction are respectively provided with a second open groove 201ac, and the width of the single first open groove 201ab is smaller than that of the first groove portion 201ca, and the width of the single second open groove 201ac is smaller than that of the second groove portion 210 cb. The first slot 201ab and the second slot 201ac are each formed as a strip-shaped slit.

Referring to fig. 40, fig. 40 is another half sectional view of the generator 1.

In one embodiment, the cooling air duct 300 includes a first communication port 302c and a second communication port 302d, the first communication port 302c communicates with the ventilation gap 400, and the second communication port 302d communicates with the cavity 10a in the hollow of the stator core 100, so that the cooling medium a flows between the ventilation gap 400 and the cavity 10 a. One of the first communication port 302c and the second communication port 302d is an air inlet and the other is an air outlet, and the first communication port 302c and the second communication port 302d are at least partially offset. The term "at least partially displaced" as used herein means that the first communication port 302c and the second communication port 302d are not in a position facing each other, and may be partially displaced or entirely displaced. Like this, when coolant A flows to second intercommunication mouth 302d from first intercommunication mouth 302c, collide with the inner wall of cooling duct 300, play the vortex effect, make coolant A flow more fully and mix from this, be favorable to strengthening stator core 100's heat transfer effect.

In one embodiment, cooling air duct 300 includes an axial air duct 302 extending in the axial direction of stator core 100. Along the radial direction of stator core 100, one side of axial wind channel 302 is equipped with ventilation gap 400, and the other side is equipped with cavity 10a, axial wind channel 302 intercommunication ventilation gap 400 with cavity 10 a. The axial air duct 302 is provided with the first communication port 302c and the second communication port 302d, the first communication port 302c is formed by the communication port of the axial air duct 302 and the ventilation gap 400, the second communication port 302d is formed by the communication port of the cavity 10a, and the first communication port 302c and the second communication port 302d are at least partially staggered in the axial direction of the stator core 100. In this embodiment, the first communication port 302c and the second communication port 302d are staggered in the axial direction of the stator core 100 and located at different heights, so that the cooling medium a can sufficiently flow and mix in the extending direction of the axial air duct 302, and the cooling effect of the stator core 100 at the axial air duct 302 is improved.

Referring to fig. 40 and 41, fig. 41 is a schematic view of a portion of the lamination stack 200 in the stator core 100.

In one embodiment, the stator core 100 includes radial ventilation slots 1000 extending radially along itself and a plurality of lamination packs 200, the plurality of lamination packs 200 including a first lamination pack 200 'and a second lamination pack 200 "aligned in an axial direction of the stator core 100, an axial gap between the first lamination pack 200' and the second lamination pack 200" forming the radial ventilation slots 1000, one end of the radial ventilation slots 1000 being adapted to directly communicate with the air gap 30 and the other end communicating with the cavity 10 a. The first lamination stack 200 'is provided with the axial air duct 302, the axial air duct 302 penetrates through the first lamination stack 200' and is communicated with the cavity 10a through the radial ventilation groove 1000, and the communication port of the axial air duct 302 and the radial ventilation groove 1000 forms the second communication port 302 d. The second communication port 302d is provided at a position where the axial air duct 302 is communicated with the radial ventilation groove 1000, compared with a low-pressure region of the axial air duct 302, in the radial ventilation groove 1000, so that the flow resistance of the cooling medium a can be reduced, the flowability of the cooling medium a is good, and the heat exchange efficiency is high.

In one embodiment, the axial air duct 302 may extend through two ends of the first laminated stack 200 'in the axial direction of the stator core 100 and communicate with the radial ventilation slots 1000 disposed at two ends of the first laminated stack 200', so that the two ends of the axial air duct 302 respectively form the second communication ports 302d, and the cooling medium a entering the axial air duct 302 may fully circulate along the extending direction of the axial air duct 302, thereby further increasing the effective heat dissipation area and achieving sufficient heat dissipation.

Referring to fig. 42, fig. 42 is a further half sectional view of the generator 1.

The cooling air duct 300 includes a radial air duct 301 extending along the radial direction of the stator core 100 and an axial air duct 302 extending along the axial direction of the stator core 100, and the radial air duct 301 is communicated with the axial air duct 302, and is communicated with the ventilation gap 400 and the cavity 10 a. In one embodiment, the radial air duct 301 includes a cavity-side radial segment 301b extending in the radial direction of the stator core 100, and the cavity-side radial segment 301b is located between the axial air duct 302 and the cavity 10a and communicates the axial air duct 302 and the cavity 10 a. Wherein the axial air duct 302 and the communication port of the cavity-side radial section 301b form the second communication port 302 d. The axial air duct 302 is located between the ventilation gap 400 and the cavity-side radial section 301b, and communicates the ventilation gap 400 with the cavity-side radial section 301b, the communication port between the axial air duct 302 and the ventilation gap 400 forms the first communication port 302c, and the first communication port 302c and the second communication port 302d are at least partially staggered in the axial direction of the stator core 100. In this embodiment, the first communication port 302c and the second communication port 302d are staggered in the axial direction of the stator core 100, and the axial distance between the first communication port 302c and the second communication port 302d is increased, so that the cooling medium a can sufficiently flow and mix in the extending direction of the axial air duct 302, and the cooling effect of the stator core 100 is improved. In addition, the cavity-side radial segment 301b is formed in the stator core 100, and when the cooling medium a flows from the second communication port 302d to the cavity 10a, the cooling medium a always flows through the stator core 100, so that the cooling medium a and the stator core 100 have good contact, and the heat exchange method is more direct and efficient.

In one embodiment, the radial air duct 301 includes a winding-side radial section 301a extending in the radial direction of the stator core 100, the axial air duct 302 is located between the winding-side radial section 301a and the cavity-side radial section 301b, the axial air duct 302 communicates the winding-side radial section 301a and the cavity-side radial section 301b, the winding-side radial section 301a communicates the ventilation gap 400 with the axial air duct 302, and the communication port of the axial air duct 302 and the winding-side radial section 301a forms the first communication port 302 c. The winding-side radial segment 301a communicates the ventilation gap 400 with the axial air passage 302, and ensures the circulation of the cooling medium a between the ventilation gap 400 and the cavity 10 a. The winding-side radial segment 301a in fig. 42 is arranged in a substantially similar manner to the winding-side radial segment 301a described above, and will not be described again here.

Referring to fig. 43, fig. 43 is another half sectional view of the generator 1.

The axial air passage 302 may communicate with both the cavity-side radial section 301b and the radial ventilation groove 1000, respectively, to form second communication ports 302d, respectively, at different positions. Specifically, the axial air duct 302 is disposed in the first lamination stack 200 ', one end of the axial air duct 302 penetrates through the first lamination stack 200' and is communicated with the radial ventilation groove 1000, and the second communication port 302d is formed by a communication port of the axial air duct 302 and the radial ventilation groove 1000. The axial air passage 302 also communicates with the cavity-side radial segment 301b, forming the second communication port 302 d. In this embodiment, by the second communication port 302d being allowed to communicate with the radial ventilation groove 1000 and the cavity-side radial section 301b, respectively, a part of the cooling medium a can flow toward the cavity 10a via the cavity-side radial section 301b, and another part of the cooling medium a can flow toward the cavity 10a along the radial ventilation groove 1000. Because the radial ventilation groove 1000 is the low-pressure area, can play better reposition of redundant personnel effect to make the flow resistance reduce, consequently, be convenient for more the coolant A in the axial wind channel 302 to the tip flow of axial wind channel 302, realize the intensive mixing of coolant A in the axial wind channel 302, accelerate the circulation of coolant A and improve cooling efficiency.

In one embodiment, the first communication port 302c is an air inlet, the second communication port 302d is an air outlet, and the second communication port 302d is disposed at an end of the axial air duct 302 close to the radial ventilation groove 1000. In this way, on the one hand, sufficient circulation of the cooling medium a in the axial air duct 302 is facilitated. On the other hand, the inside of the radial ventilation groove 1000 is a low-pressure region, and the flow resistance when the cooling medium a flows to the side where the radial ventilation groove 1000 is located is small, and the circulating fluidity is good.

Referring to fig. 44-47, fig. 44 is a schematic view of another embodiment of a lamination stack 200. Fig. 45 shows a schematic view of the first lamination S1 of the lamination stack 200 shown in fig. 44. Fig. 46 shows a schematic view of the second lamination S2 of the lamination stack 200 shown in fig. 44. Fig. 47 shows a schematic view of the third lamination S3 of the lamination stack 200 shown in fig. 44.

The specific formation of the axial air channel 302 is not limited. In one embodiment, the plurality of laminations 201 includes a first lamination S1 and a second lamination S2, at least one of the yoke portion 201a of the first lamination S1 and the yoke portion 201a of the second lamination is provided with an opening 500 penetrating in a thickness direction, and the opening 500 forms the axial air channel 302. The axial air passage 302 is formed in a simple manner.

In a specific embodiment, referring to fig. 45 and 46, in the radial direction of the stator core 100, the size of the yoke portion 201a of the first lamination S1 is equal to the size of the yoke portion 201a of the second lamination S2, the opening 500 includes a first opening 500 ' and a second opening 500 ", the yoke portion 201a of the first lamination S1 is provided with the first opening 500 ', the yoke portion 201a of the second lamination S2 is provided with the second opening 500", and the first opening 500 ' and the second opening 500 "partially overlap in the stacking direction, and the overlapping portion forms an axial air duct 302. In this embodiment, the radial dimension of the yoke portion 201a of the first lamination S1 is equal to the radial dimension of the yoke portion 201a of the second lamination S2, and the cross-sectional shape and dimension of the axial air duct 302 can be changed by providing the first opening 500' and the second opening 500 ″ with different shapes and dimensions, so that the structure of the axial air duct 302 can be diversified, and the local turbulence degree of the axial air duct 302 can be enhanced.

The corners of the bottom of the first opening 500' may be rounded, and the corners of the bottom of the second opening 500 "may be rounded, as described with reference to fig. 25 and related description. Furthermore, the lamination stack 200 can be provided with a compression structure as well as a radial tensioning structure. The radial tensioning structure can be specifically referred to in fig. 13 and the related description, and the compressing structure can be referred to in fig. 26 and the related description, which are not repeated herein. In addition, the first opening 500' may be formed in the manner shown in FIG. 19.

The specific formation manner of the cavity-side radial segment 301b is not limited. In one embodiment, the plurality of laminations 201 includes a third lamination S3, the third lamination S3 is stacked between the first lamination S1 and the second lamination S2, a dimension of the yoke portion 201a of the third lamination S3 in a radial direction of the stator core 100 is smaller than a dimension of the yoke portion 201a of the first lamination S1 and smaller than a dimension of the yoke portion 201a of the second lamination S2 in the direction, a gap is formed between the yoke portion 201a of the first lamination S1 and the yoke portion 201a of the second lamination S2, the gap communicates the axial air duct 302 with the cavity 10a, and a passage of the cavity 10a forms the cavity-side radial segment 301 b. This arrangement makes it possible to communicate the cavity-side radial segments 301b in the circumferential direction of the stator core 100, thereby increasing the flow area of the cavity-side radial air ducts 301b in the circumferential direction.

Referring to fig. 48, fig. 48 is a schematic view of another embodiment of the third lamination S3 in the lamination stack shown in fig. 44.

In one embodiment, the plurality of laminations 201 includes a third lamination S3, the yoke portion 201a of the third lamination S3 has a size in the radial direction of the stator core 100 equal to the size of the yoke portion 201a of the first lamination S1 and the yoke portion 201a of the second lamination S2 in this direction, the yoke portion 201a of the third lamination S3 may be provided with a cavity communication hole 600 ', one end of which communicates with a cavity 10a and the other end of which terminates at the yoke portion 201a of the third lamination S3, the cavity communication hole 600 ' communicates the axial air duct 302 with the cavity 10a, and the cavity communication hole 600 ' communicates the axial air duct 302 with the cavity 10a to form a cavity-side radial segment 301 b.

In one embodiment, the number of the first communication ports 302c may be greater than the number of the second communication ports 302d, so as to facilitate at least partial misalignment of the first communication ports 302c with the second communication ports 302d while allowing more cooling medium a to flow sufficiently along the axial air duct 302. For example, the number of the cavity-side radial sections 301b may be reduced by providing a smaller number of the third laminations S3 such that the number of the third laminations S3 is smaller than the number of the first laminations S1 and the second laminations S2, thereby reducing the number of the second communication ports 302 d.

Further, in order to avoid too large a difference in the total flow area of the first communication port 302c and the second communication port 302d, the flow area of the single second communication port 302d may be larger than the flow area of the single first communication port 302 c. For example, the thickness of the third lamination S3 may be increased to increase the flow area of the single second communication port 302 d. Alternatively, the flow area of the single second communication port 302d may be increased by increasing the number of the third lamination S3.

In the embodiment shown in fig. 41 and 44, a plurality of axial air ducts 302 may be provided, arranged along the circumferential direction of the stator core 100, and communicated with each other, so that the cooling medium a may be sufficiently mixed in the plurality of axial air ducts 302. In one embodiment, the dimension of the yoke portion 201a of the third lamination S3 in the radial direction of the stator core 100 is smaller than the dimension of the yoke portion 201a of the first lamination S1 and the yoke portion 201a of the second lamination S2 in this direction, and the projection of the axial air duct 302 in the orthographic projection of the stacking direction is located outside the projection area of the yoke portion 201a of the third lamination S3, thereby enabling the communication of the plurality of axial air ducts 302.

In some embodiments, the second communication port 302d may be disposed at an end of the axial air chute 302. For example, the second communication port 302d may be provided at one end of the axial air passage 302 opposite to the flow direction of the cooling medium a, or the second communication port 302d may be provided at one end of the axial air passage 302 in the same flow direction as the flow direction of the cooling medium a.

Referring to fig. 49, fig. 49 is a schematic flow diagram illustrating the cooling medium a flowing from the air gap to the cavity.

In the embodiment shown in fig. 49, the cooling medium a flows into the air gap 30 from one end in the axial direction of the stator core 100, and flows to the second communication port 302d through the first communication port 302 c. The first communication ports 302c are provided in plural, the plural first communication ports 302c are arranged along the flow direction of the cooling medium a in the air gap 30, and are distributed side by side at the end of the axial air duct 302 that is the same as the flow direction of the cooling medium a, and the second communication ports 302d are provided at the end of the axial air duct 302 that is opposite to the flow direction of the cooling medium a, so that the first communication ports 302c and the second communication ports 302d may be staggered in the axial direction. Further, a large amount of the cooling medium a can flow in from the first communication port 302c closest to the second communication port 302d, and a relatively small amount of the cooling medium a flows in from the remaining first communication ports 302c, and local high-temperature hot spots can be effectively alleviated.

Referring to fig. 50, fig. 50 is a schematic view showing another flow direction of the cooling medium a from the air gap to the cavity.

In the embodiment shown in fig. 50, the cooling medium a flows into the air gap 30 from one end in the axial direction of the stator core 100, and flows to the second communication port 302d through the first communication port 302 c. The first communication ports 302c are provided in plural, the plural first communication ports 302c are arranged along the flow direction of the cooling medium a in the air gap 30, and are distributed side by side at the end of the axial air duct 302 opposite to the flow direction of the cooling medium a, and the second communication ports 302d are provided at the end of the axial air duct 302 identical to the flow direction of the cooling medium a, so that the first communication ports 302c and the second communication ports 302d may be staggered in the axial direction. Moreover, the flow rates of the cooling medium a at the first communication ports 302c are relatively balanced, so that the flow rate uniformity of each radial section in axial distribution is enhanced, the stator parts adjacent to each radial section are uniformly cooled, and the overall flow resistance in the generator 1 is favorably reduced.

Since the heat dissipation paths of the components of the generator 1 are different, a temperature gradient is formed in space, and particularly in the axial direction of the stator core 100, the temperature of the axial end portion of the stator winding 102 is higher than that of the axial middle portion, so that the generator stator 10 includes a high temperature region and a low temperature region having different temperatures. Based on this, this application proposes, set up the high temperature zone the draught area of ventilation clearance 400 is greater than the low temperature zone the draught area of ventilation clearance 400 is so that generator stator 10 is in the heat radiating area of high temperature zone is greater than generator stator 10 is in the heat radiating area of low temperature zone. Therefore, the flow rate of the cooling medium A flowing through the high-temperature area can be increased, the heat exchange effect is enhanced, and the effect of weakening local high-temperature hot spots is achieved.

In one embodiment, the density of the ventilation gaps 400 in the high temperature zone is made greater than the density of the ventilation gaps 400 in the low temperature zone. That is, a larger number of ventilation gaps 400 may be provided in the high temperature region, so that the flow area of the cooling medium a in the high temperature region is larger than the flow area of the cooling medium a in the low temperature region, thereby making the temperature rises in the high temperature region and the low temperature region relatively close to each other, and achieving the purpose of reducing the local high temperature rise.

Referring to fig. 51, fig. 51 is a schematic diagram illustrating a partial structure of a stator core 100.

Stator core 100 includes a plurality of ventilation gaps 400, ventilation gap 400 including form in first ventilation gap 4001 and second ventilation gap 4002 of high temperature zone, first ventilation gap 4001 with second ventilation gap 4002 arrange and adjacent along stator core 100's axial, ventilation gap 400 including form in the third ventilation gap 4003 and the fourth ventilation gap 4004 of low temperature zone, third ventilation gap 4003 with fourth ventilation gap 4004 arrange and adjacent along stator core 100's axial, wherein, the axial distance between first ventilation gap 4001 and the second ventilation gap 4002 is less than the axial distance between third ventilation gap 4003 and the fourth ventilation gap 4004. Thus, the number of the ventilation gaps 400 in the high temperature region can be greater than the number of the ventilation gaps 400 in the low temperature region, so that the density of the ventilation gaps 400 in the high temperature region is greater than that of the ventilation gaps 400 in the low temperature region, the ventilation area in the high temperature region is increased, and the heat dissipation area of the generator stator 10 in the high temperature region is increased.

Referring to fig. 51, 52 and 53, fig. 52 is a schematic view of the first laminate S1 shown in fig. 51. Fig. 53 is a schematic view of the second laminate S2 shown in fig. 51.

The stator core 100 includes a lamination stack 200, the lamination stack 200 has a high temperature region and a low temperature region, and the lamination stack 200 is provided with a plurality of ventilation gaps 400. In the laminated sheet stack 200, the teeth 201b of the plurality of laminated sheets 201 are stacked, and the plurality of teeth 201b do not completely overlap in the tooth width direction, so that the stator winding 102 and the teeth 201b adjacent to the stator winding 102 are formed with the ventilation gap 400 in the tooth width direction. The specific formation of the ventilation gap 400 can be referred to the description above, and will not be described herein.

In one embodiment, the number of laminations 201 between the first vent gap 4001 and the second vent gap 4002 is less than the number of laminations 201 between the third vent gap 4003 and the fourth vent gap 4004, such that the axial distance between the first vent gap 4001 and the second vent gap 4002 is less than the axial distance between the third vent gap 4003 and the fourth vent gap 4004, thereby causing the density of vent gaps 400 in the high temperature zone to be greater than the density of vent gaps 400 in the low temperature zone. In this embodiment, a smaller number of laminations 201 are stacked between the first ventilation gap 4001 and the second ventilation gap 4002, and a larger number of laminations 201 are stacked between the third ventilation gap 4003 and the fourth ventilation gap 4004, whereby a high density of ventilation gaps 400 in the high temperature region and a low density of ventilation gaps 400 in the low temperature region are realized. The tooth widths of the teeth 201b of the laminations 201 stacked between the first ventilation gap 4001 and the second ventilation gap 4002 may be equal and aligned in the tooth width direction, and the tooth widths of the teeth 201b of the laminations 201 stacked between the third ventilation gap 4003 and the fourth ventilation gap 4004 may be equal and aligned in the tooth width direction.

In the embodiment shown in fig. 51, the high temperature region and the low temperature region are distributed along the axial direction (Z direction in the figure) of the stator core 100, and the number of the lamination sheets 201 between the adjacent ventilation gaps 400 gradually increases from the high temperature region to the low temperature region. For example, the number of the lamination sheets 201 between the adjacent ventilation gaps 400 is increased from ten to twenty from the high temperature region to the low temperature region, but not limited thereto.

In one embodiment, the ventilation areas of the individual ventilation gaps 400 in the high temperature region and the low temperature region may be set to be equal, while the number of ventilation gaps 400 in the high temperature region is larger and the number of ventilation gaps 400 in the low temperature region is smaller, to achieve the purpose of large ventilation area in the high temperature region and small ventilation area in the low temperature region. The ventilation areas of the single ventilation gaps 400 are equal, the single ventilation gaps can be formed by the stator winding 102 and the lamination sheets 201 with equal thicknesses, the thicknesses of the lamination sheets 201 are equal, the specification of the lamination sheets 201 can be reduced, the processing and the manufacturing of the lamination sheets 201 are facilitated, and the risk of material confusion in the stacking process is reduced.

In the embodiment shown in fig. 51, the ventilation areas of the first ventilation gap 4001, the second ventilation gap 4002, the third ventilation gap 4003 and the fourth ventilation gap 4004 are equal, the first ventilation gap 4001, the second ventilation gap 4002, the third ventilation gap 4003 and the fourth ventilation gap 4004 may be formed by the stator winding 102 and a plurality of first laminations S1 which are equal in number and thickness, respectively, and the number of the first laminations S1 is not limited. In one embodiment, a plurality of first laminations S1, equal in number and thickness, may be pre-stacked into a stack, and the stator winding 102 may form a first ventilation gap 4001, a second ventilation gap 4002, a third ventilation gap 4003, and a fourth ventilation gap 4004 with four stacks, respectively, to achieve equal ventilation areas for the fourth of the first ventilation gap 4001, the second ventilation gap 4002, the third ventilation gap 4003, and the fourth ventilation gap 4004.

Referring to fig. 54, fig. 54 is a schematic view of another lamination stack 200.

In one embodiment, the ventilation areas of the respective ventilation gaps 400 in the high temperature region and the low temperature region may be set to be different. Specifically, the plurality of laminations 201 include a first lamination S1 stacked in the high temperature region and a second lamination S2 stacked in the low temperature region, the stator winding 102 and the tooth 201b of the first lamination S1 form the ventilation gap 400', and the tooth 201b of the second lamination S2 forms the ventilation gap 400 ″, wherein the thickness of the tooth 201b of the first lamination S1 is greater than the thickness of the tooth 201b of the second lamination S2. In this way, the ventilation area of the ventilation gap 400' formed by the stator winding 102 and the teeth 201b of the first lamination S1 is made larger than the ventilation area of the ventilation gap 400 ″ formed by the stator winding 102 and the teeth 201b of the second lamination S2. In this embodiment, through set up the lamination 201 of different thickness in high temperature region and low temperature region, can realize that the draught area of high temperature region is big and the draught area of low temperature region is little, and the scheme is simple and be convenient for realize.

In the embodiment shown in fig. 54, the ventilation gap 400 includes a first ventilation gap 4001 and a second ventilation gap 4002 formed in the high temperature region, the first ventilation gap 4001 and the second ventilation gap 4002 are arranged and adjacent to each other in the axial direction of the stator core 100, the ventilation gap 400 includes a third ventilation gap 4003 and a fourth ventilation gap 4004 formed in the low temperature region, the third ventilation gap 4003 and the fourth ventilation gap 4004 are arranged and adjacent to each other in the axial direction of the stator core 100, the thickness of the tooth portion 201b between the first ventilation gap 4001 and the second ventilation gap 4002 is smaller than the thickness of the tooth portion 201b between the third ventilation gap 4003 and the fourth ventilation gap 4004, which makes the axial distance between the first ventilation gap 4001 and the second ventilation gap 4002 small, and the axial distance between the third ventilation gap 4003 and the fourth ventilation gap 4004 large, this makes it possible to reduce the density of the ventilation gaps 400 in the low-temperature region to be lower than the density of the ventilation gaps 400 in the high-temperature region. In this embodiment, the ventilation area of the ventilation gap 400 in the high temperature region is large and the density is large, and the ventilation area of the ventilation gap 400 in the low temperature region is small and the density is small, which is advantageous for reducing the temperature difference between the high temperature region and the low temperature region.

In one embodiment, the high temperature region and the low temperature region are distributed along the axial direction (Z direction in the figure) of the stator core 100, and the thickness of the lamination sheet 201 between the adjacent ventilation gaps 400 is sequentially increased from the high temperature region to the low temperature region, so that the density of the ventilation gaps 400 is sequentially decreased from the high temperature region to the low temperature region. In another embodiment, the thickness of each tooth portion 201b forming the ventilation gap 400 with the stator winding 102 is gradually reduced from the high temperature region to the low temperature region, so that the ventilation area of each ventilation gap 400 is gradually reduced from the high temperature region to the low temperature region. In this embodiment, the above two schemes are combined, so that the distribution modes of the ventilation gaps 400 in the high temperature region and the ventilation gaps 400 in the low temperature region are more diversified.

In the embodiment shown in fig. 51 to 54, the size of the yoke portion 201a of the first lamination S1 in the radial direction of the stator core 100 is larger than the size of the yoke portion 201a of the second lamination S2 in this direction. In other embodiments, the size of the yoke portion 201a of the first lamination S1 in the radial direction of the stator core 100 may be equal to the size of the yoke portion 201a of the second lamination S2 in this direction.

Referring to fig. 55 to 57, fig. 55 is a schematic view of a lamination stack 200 according to another embodiment. Fig. 56 is a schematic view of the first lamination S1 of the lamination stack 200 shown in fig. 55. Fig. 57 is a schematic view of the second lamination S2 of the lamination stack 200 shown in fig. 55.

In one embodiment, the size of the yoke portion 201a of the first lamination S1 in the radial direction of the stator core 100 is equal to the size of the yoke portion 201a of the second lamination S2 in this direction. The yoke portion 201a of the second lamination S2 is formed with a cavity communication hole 600 'having one end communicating with the axial air passage 302 and the other end communicating with the cavity 10a, and a passage of the cavity communication hole 600' communicating the axial air passage 302 and the cavity 10a may be a cavity-side radial segment 301 b.

As shown in fig. 57, the yoke portion 201a of the second lamination S2 is formed with a plurality of cavity communication holes 600 ', and adjacent cavity communication holes 600' are partitioned by partitions 901 to form a plurality of cavity-side radial segments 301 b. Wherein the spacers 901 are identical to the support structure 900 shown in fig. 29, achieving axial support of the yoke portion 201a of the first lamination S1, improving the strength of the lamination stack 200.

The embodiment of each ventilation gap 400 in fig. 55 is substantially the same as the embodiment of each ventilation gap 400 in fig. 51 and will not be described again here.

In the embodiment shown in fig. 51, 54 and 55, the lamination stack 200 is provided with a cooling air duct 300, the cooling air duct 300 includes a radial air duct 301 extending in the radial direction of the stator core 100 and an axial air duct 302 extending in the axial direction of the stator core 100, the radial air duct 301 includes a winding-side radial section 301a and a cavity-side radial section 301b, the winding-side radial section 301a communicates the ventilation gap 400 and the axial air duct 302, and the cavity-side radial section 301b communicates the axial air duct 302 and the cavity 10 a. The formation manners of the axial air duct 302, the winding-side radial segment 301a, and the cavity-side radial segment 301b may refer to the foregoing description, and are not described herein again.

In one embodiment, the permanent magnets 22 include a first permanent magnet assembled at an axial end of the rotor core 21 and a second permanent magnet assembled at an axial middle of the rotor core 21, and the first permanent magnet has a lower grade than the second permanent magnet. That is, the remanence and the coercive force of the first permanent magnet are smaller than those of the second permanent magnet, respectively. For example, the first permanent magnet is under the designation N35H, and the second permanent magnet is under the designation N45H (better performance, but less economical), but not limited thereto. When the cooling medium a enters the air gap 30 along both ends of the stator core 100, the temperature of the cooling medium a is lower in the axial end region and higher in the axial middle region, so that the first permanent magnet is lower in temperature and the second permanent magnet is higher in temperature. Because the temperature coefficient of the permanent magnet material is mostly negative, especially the neodymium iron boron permanent magnet material commonly used in the permanent magnet wind power generator, when the first permanent magnet adopts a low grade, the first permanent magnet and the second permanent magnet are expected to have more approximate or almost same magnetic performance when in operation, thereby effectively reducing the cost of the permanent magnet material. On the other hand, when the density of the ventilation gaps 400 in the axial end regions of the stator core 100 is greater than that in the axial middle region (for example, as shown in fig. 51), the tooth crest area of the stator teeth 100b facing the first permanent magnet is also relatively small, and if the first permanent magnet and the second permanent magnet are of the same grade, although the air gap flux density can be kept to be larger, the leakage flux ratio is also increased, and the permanent magnet utilization rate is low, so that the economy can be improved by reducing the grade of the first permanent magnet. The two aspects are in a superposition effect, and the factor of the second aspect is more obvious, so that the grade of the first permanent magnet is lower than that of the second permanent magnet, and the effect is more obvious. It is noted that the number of the first permanent magnet and the second permanent magnet in the axial direction of the stator core 100 may be implemented as more than one piece.

In order to further enhance the cooling effect, the generator stator 10 further includes a liquid cooling system, and the combination of the liquid cooling system and the circulating air cooling system can improve the compactness, the economy and the reliability of the overall structure of the generator 1.

Referring to fig. 58, fig. 58 is a schematic view illustrating a partial structure of a stator core 100.

The yoke 100a includes a plurality of fins 100aa distributed along an axial direction of the stator core 100 and spaced apart from each other, and the plurality of fins 100aa are formed at an end of the yoke 100a remote from the stator teeth 100b in a radial direction of the stator core 100. The cooling air duct 300 includes a plurality of cavity-side radial sections 301b extending in the radial direction of the stator core 100 and distributed in the axial direction of the stator core 100, the plurality of cavity-side radial sections 301b communicate the ventilation gap 400 with the cavity 10a, and the gap between the adjacent fins 100aa forms the cavity-side radial section 301 b. The generator stator 10 comprises a liquid cooling system 11, the liquid cooling system 11 comprises a liquid cooling pipeline 110, the liquid cooling pipeline 110 penetrates through each fin 100aa and each cavity side radial section 301b along the axial direction of the stator core 100, and the fin 100aa is formed as a heat exchange fin of the liquid cooling pipeline 110. In the scheme, when the cooling medium A circulates between the air gap 30 and the cavity 10a, the cooling medium A enters the plurality of cavity side radial sections 301b, the cooling medium A is in direct contact with the liquid cooling pipeline 110 and in direct contact with the fins 100aa, so that the carried heat is transferred to the cooling liquid in the liquid cooling pipeline 110, or the cooling liquid directly radiates outwards through the fins 100 aa. In addition, the liquid cooling pipeline 110 provided by the present application is directly disposed in the circulation path of the air cooling system, and compared to a closed circulation type air cooling system (where an additional heat exchange device is disposed on the flow path of the cooling medium a as a necessary condition), the arrangement of the heat exchange device can be omitted, and the liquid cooling pipeline 110 and the stator core 100 themselves serve as the heat exchange device, so that the cooling system of the generator stator 10 is simpler and more compact. Compared with the traditional arrangement, the heat exchange device with huge volume is removed from the cavity 10a, the space crowding condition inside the cavity 10a is greatly relieved, and the maintainability of the whole generator stator 10 is obviously enhanced.

In one embodiment, the cooling air duct 300 includes a radial air duct 301 extending in a radial direction of the stator core 100 and an axial air duct 302 extending in an axial direction of the stator core 100, the radial air duct 301 includes a winding side radial section 301a and a cavity side radial section 301b, the winding side radial section 301a communicates the ventilation gap 400 and the axial air duct 302, the cavity side radial section 301b communicates the axial air duct 302 and the cavity 10a, and the cavity side radial section 301b is closer to the cavity 10a than the axial air duct 302 and the winding side radial section 301 a. Therefore, the fins 100aa and the liquid cooling pipeline 110 are far away from the stator winding 102, so that the heat can be effectively inhibited from being reversely transferred to the liquid cooling pipeline 110 along the magnetic yoke 100a, and at the moment, the fins 100aa and the liquid cooling pipeline 110 are equivalent to a heat exchanger arranged at the back of the stator core 100, and can replace a heat exchange device in a traditional circulating type air cooling system.

In one embodiment, the liquid cooling pipe 110 includes a plurality of extension segments 110a extending along the axial direction of the stator core 100, the plurality of extension segments 110a are arranged along the circumferential direction of the stator core 100, and the plurality of extension segments 110a pass through the fins 100aa and the cavity side radial segments 301 b. The plurality of extension segments 110a extend axially to have more contact area with the fins 100aa and more heat exchange area exposed to the cavity-side radial segment 301b, and the space occupied by the liquid cooling pipeline 110 can be saved, so that the layout of the liquid cooling system 11 is more compact.

In one embodiment, the liquid cooling circuit 110 includes U-shaped connecting sections 110b, and adjacent extension sections 110a are connected by the U-shaped connecting sections 110b to form a U-shaped pipe section 110c, and the U-shaped pipe section 110c corresponds to one of the stator windings 102 in the radial direction of the stator core 100. With this arrangement, the U-shaped tube section 110c and the partial fins 100aa corresponding to the stator winding 102 can serve as a heat exchanger for the stator winding 102 to exchange heat with the cooling medium a. In the embodiment shown in fig. 58, there are a plurality of U-shaped tube segments 110c, and the plurality of U-shaped tube segments 110c are disposed in one-to-one correspondence with the plurality of stator windings 102, so that a plurality of heat exchangers corresponding to the stator windings 102 are formed at the back of the stator core 100, and the heat exchange effect is more uniform.

In one embodiment, the lamination stack 200 is provided with said fins 100 aa. The lamination stack 200 includes a plurality of laminations 201, and the yoke portions 201a of a part of the laminations 201 are spaced apart from each other in the axial direction of the stator core 100 to form the fins 100 aa. The fins 100aa are formed through the yoke portions 201a of the lamination sheet 201 and directly contact the liquid cooling pipe 110, so that the cooling effect of the yoke 100a of the stator core 100 is enhanced.

In a particular embodiment, the lamination stack 200 is provided with the cavity-side radial segment 301b and the ventilation gap 400. The plurality of laminations 201 includes a first lamination S1 and a second lamination S2, the yoke portion 201a of the second lamination S2 is disposed to form a gap for communicating the ventilation gap 400 with the cavity 10a at a side of the yoke portion 201a of the first lamination S1 facing the second lamination S2, the gap forms the cavity-side radial section 301b, the pipe liquid cooling 110 passes through the yoke portion 201a of the first lamination S1 from the gap in an axial direction of the stator core 100, and the yoke portion 201a of the first lamination S1 forms the fin 100 aa. Thus arranged, the yoke portion 201a of the first lamination S1 is used to form the fin 100aa, and the yoke portion 201a of the second lamination S2 is used to form the cavity-side radial segment 301b, so that the fin 100aa and the cavity-side radial segment 301b are formed in a simple manner.

In one embodiment, as shown in fig. 58, in the radial direction of the stator core 100, the size of the yoke portion 201a of the second lamination S2 is smaller than the size of the yoke portion 201a of the first lamination S1, so that the gap, that is, the cavity-side radial segment 301b, is formed at the side of the yoke portion 201a of the first lamination S1 facing the second lamination S2. In this embodiment, the cavity-side radial segments 301b communicate circumferentially, and the cooling medium a can be sufficiently mixed in the cavity-side radial segments 301 b.

Further, the liquid cooling pipes 110 correspond to the stator slots 100c in the radial direction of the stator core 100. In this way, when the cooling medium a flows into the cavity-side radial section 301b from the axial air duct 302, the cooling medium a expands from a position radially opposite to the stator slot 100c to the periphery, and therefore, the flow rate of the cooling medium a at a position radially corresponding to the stator slot 100c is high, and the flow rate at a position radially corresponding to the stator tooth 100b is relatively low, so that the liquid cooling pipe 110 is made to radially correspond to the position of the stator slot 100c, and the purpose is to set the liquid cooling pipe 110 at a position where the flow rate is relatively high, thereby enhancing the heat exchange effect. In the embodiment shown in fig. 58, each extension segment 110a may correspond to one stator slot 100 c.

In the embodiment shown in fig. 58, the plurality of laminations 201 includes a plurality of first laminations S1 and a plurality of second laminations S2, the plurality of first laminations S1 and the plurality of second laminations S2 are spaced one by one, and each first lamination S1 is adjacent to the second lamination S2, so that a plurality of cavity-side radial sections 301b can be formed, in which case the cavity-side radial sections 301b are equivalent to the gaps between the yoke portions 201a of the adjacent first laminations S1. The denser the cavity-side radial section 301b is, the more the liquid cooling pipe 110 can be fully utilized, and the better the heat exchange effect is.

Referring to fig. 59, fig. 59 is another schematic view of a partial structure of the stator core 100.

In one embodiment, the stator core 100 includes a radial ventilation slot 1000 and a plurality of lamination stacks 200, the lamination stacks 200 are arranged in a hollow cylindrical structure, the lamination stacks 200 include a first lamination stack 200 'and a second lamination stack 200 "arranged along an axial direction of the stator core 100, an axial gap between the first lamination stack 200' and the second lamination stack 200" forms the radial ventilation slot 1000, one end of the radial ventilation slot 1000 is used for directly communicating with the air gap 30, the other end of the radial ventilation slot 1000 communicates with the cavity 10a in the hollow of the stator core 100, and the liquid cooling pipeline 110 passes through the radial ventilation slot 1000 along the axial direction of the stator core 100. The radial ventilation slots 1000 are combined with the cooling air duct 300 so that the cooling effect of the air cooling system is further enhanced. Furthermore, the liquid cooling pipeline 110 passes through the radial ventilation slot 1000 along the axial direction of the stator core 100, so that the cooling medium a directly entering the radial ventilation slot 1000 from the air gap 30 can also exchange heat with the cooling liquid in the liquid cooling pipeline 110, and the cooling medium a can fully exchange heat with the cooling liquid.

The liquid cooling pipeline 110 penetrates through the cavity side radial section 301b and the radial ventilation groove 1000 along the axial direction of the stator core 100, so that the bending of the liquid cooling pipeline 110 can be reduced, the flowing energy of cooling liquid in the liquid cooling pipeline 110 is smooth, the flowing resistance is reduced, the heat exchange rate is improved, and meanwhile, the installation, the overhaul and the maintenance of the liquid cooling pipeline 110 are facilitated.

Referring to fig. 60-62, fig. 60 is a schematic view of another embodiment of a lamination stack 200. Fig. 61 shows a schematic view of the first lamination S1 of the lamination stack shown in fig. 60. Figure 62 shows a schematic view of the second lamination S2 of the lamination stack shown in figure 60.

The lamination stack 200 is provided with an axial air duct 302, a winding-side radial section 301a and a cavity-side radial section 301b, the winding-side radial section 301a communicating the ventilation gap 400 with the axial air duct 302, and the cavity-side radial section 301b communicating the axial air duct 302 with the cavity 10 a.

In the embodiment shown in fig. 61 and 62, the dimension of the yoke portion 201a of the second lamination S2 in the radial direction of the stator core 100 is smaller than the dimension of the yoke portion 201a of the first lamination S1 in this direction, so that the yoke portion 201a of the first lamination S1 forms a cavity-side radial segment 301b on the side facing the second lamination S2. The winding-side radial segment 301a and the axial air duct 302 may be formed in the manner described above, and will not be described herein again.

The lamination stack 200 is provided with a liquid cooling line 110, the cooling line 110 passing through the yoke portion 201a and the cavity side radial section 301b of the first lamination S1, wherein the yoke portion 201a of the first lamination S1 is formed as a heat exchanging fin of the liquid cooling line 110, and the liquid cooling line 110 and the fin 100aa together form a heat exchanger of the lamination stack 200.

Referring to fig. 63 and 64, fig. 63 is another schematic view of the first laminate S1 shown in fig. 60. Fig. 64 shows a further schematic view of the second laminate S2 shown in fig. 60.

In one embodiment, in the radial direction of the stator core 100, the yoke portion 201a of the second lamination S2 has a size equal to that of the yoke portion 201a of the first lamination S2, the yoke portion 201a of the second lamination S201 a is provided with a cavity communication hole 600 ', one end of the cavity communication hole 600 ' communicates with the axial air duct 302 and the other end communicates with the cavity 10a, and the passage of the cavity communication hole 600 ' communicating the axial air duct 302 with the cavity 10a forms the gap, which is the cavity-side radial segment 301 b. The cavity communication hole 600 'may be provided in plurality, and the plurality of cavity communication holes 600' may be arranged in the circumferential direction of the stator core 100 to form a plurality of cavity-side radial segments 301 b.

In the embodiment shown in fig. 61 and 63, the yoke portion 201a of the first lamination S1 is provided with a pipe hole 110d through which the liquid cooling pipe 110 passes, and the liquid cooling pipe 110 passes through the pipe hole 110d into the yoke portion 201a of the first lamination S1, and into the cavity-side radial section 301b and the radial ventilation slots 1000. The cavity communication hole 600' is shown in fig. 64 at a position corresponding to the cavity-side radial section 301b, in which the extension section 100a of the liquid cooling pipe 110 is opposed to the groove 201 c.

The lamination stack 200 may include a radial tension structure to achieve fixation of the lamination stack 200 in the radial direction of the stator core 100. In the embodiment shown in fig. 63 and 64, the yoke portion 201a of the first lamination S1 includes the first positioning groove 201aa, the yoke portion 201a of the second lamination S2 includes the second positioning groove 201aa ', the first positioning groove 201aa corresponds to the second positioning groove 201 aa' in the stacking direction, and the positioning groove 700 (refer to fig. 13) passing therethrough in the axial direction may be formed. The radial tensioning arrangement may include a locating bracket (not shown) at least partially assembled within the locating slot 700 to radially locate the plurality of laminations 201. The shape of the positioning groove 700 is not limited, in this embodiment, the positioning groove 700 is a positioning groove with a dovetail structure, and correspondingly, the positioning bracket can be a positioning bracket with a dovetail structure, but is not limited thereto.

In some of the embodiments described above, only the case in which the same lamination stack 200 includes laminations 201 of both the first lamination S1 and the second lamination S2 gauge is shown. However, it should be noted that the same lamination stack 200 is not limited to include only two sizes of laminations 201, but may include more or fewer sizes of laminations 201. However, in the manufacturing process of the stator core 100, the more the sizes of the lamination sheets 201 are, the more confusion is easily caused, and therefore, it is preferable to include the lamination sheets 201 of at most two sizes in the same lamination stack 200.

In some embodiments described above, each lamination 201 in the lamination stack 200 may use a silicon steel sheet with a thickness of 0.2mm to 0.7mm, and may further use a silicon steel sheet with a thickness of 0.65 mm. The number of laminations 201 in lamination stack 200 is not limited. Lamination stack 200 can adopt modes such as riveting, bonding to assemble in advance, reduces the risk of stacking the mistake. In addition, in order to prevent the sharp corners of the teeth 201b of the lamination sheet 201 from scratching the stator winding 102, the sharp corners of the teeth 201b may be chamfered, as shown in fig. 29.

In some of the embodiments described above, the thickness of each lamination 201 in lamination stack 200 may be different and may be selected according to practical situations. In addition, the height dimension of the cooling air duct 300 and the height dimension and the width dimension of the ventilation gap 400 are not suitable to be too small, for example, the height dimension and the width dimension may be larger than 3mm, and for example, 4mm to 6mm is preferably selected, so that on one hand, the flow resistance of the cooling medium a may be reduced, and on the other hand, the situation that the cooling air duct 300 is blocked during vacuum dip coating due to the too small height dimension and the too small width dimension of the cooling air duct 300 may be considered. The height dimension of the cooling air duct 300 and the height dimension and the width dimension of the ventilation gap 400 should not be too large, which would reduce the ratio of the heat dissipation area to the flow area, and thus would reduce the cooling effect for a fixed volume flow rate of the cooling medium a, and on the other hand, too large a width of the ventilation gap 400 would mean that the width of the tooth portion 201b becomes narrow, and electromagnetic properties such as electromagnetic torque would be lost, and the loss would increase in a manner larger than a linear relationship.

In some embodiments described above, the first lamination S1 and/or the second lamination S2 are not limited to one lamination, but may be a stack of a plurality of laminations.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A generator stator, comprising:

the stator winding and at least one stator tooth adjacent to the stator winding are provided with a ventilation gap in the tooth width direction, the ventilation gap extends along the extending direction of the stator tooth, the cooling air duct comprises a first communication port and a second communication port which are communicated, the first communication port is communicated with the ventilation gap, the second communication port is communicated with the cavity in the hollow position of the stator core, one of the first communication port and the second communication port is an air inlet, the other one of the first communication port and the second communication port is an air outlet, the first communication port and the second communication port are at least partially staggered, and the ventilation gap is used for communicating with an air gap between a generator stator and a generator rotor.

2. The generator stator according to claim 1, wherein the cooling air duct includes an axial air duct extending in an axial direction of the stator core, the axial air duct is provided with the ventilation gap on one side and the cavity on the other side in a radial direction of the stator core, the axial air duct communicates the ventilation gap with the cavity, the axial air duct is provided with the first communication port and the second communication port, the communication port of the axial air duct and the ventilation gap forms the first communication port, the communication port of the axial air duct and the communication port of the cavity forms the second communication port, and the first communication port and the second communication port are at least partially staggered in the axial direction of the stator core.

3. Generator stator according to claim 2, wherein the stator core comprises radial ventilation slots extending in a radial direction of the stator core, and a plurality of lamination groups arranged in a hollow cylindrical configuration, the plurality of lamination groups comprising a first lamination group and a second lamination group arranged in an axial direction of the stator core, an axial gap between the first lamination group and the second lamination group forming the radial ventilation slots, one end of the radial ventilation slots being adapted to communicate directly with the air gap and the other end communicating with the cavity, the first lamination group being provided with the axial air duct, one end of the axial air duct extending through the first lamination group and communicating with the cavity through the radial ventilation slots, the communication ports of the axial air duct and the radial ventilation slots forming the second communication port.

4. The generator stator according to claim 1, wherein the cooling air duct includes an axial air duct extending in an axial direction of the stator core and a cavity-side radial section extending in a radial direction of the stator core, the cavity-side radial section communicates the axial air duct with the cavity, a communication port of the axial air duct and the cavity-side radial section forms the second communication port, the axial air duct communicates the ventilation gap with the cavity-side radial section, the communication port of the axial air duct and the ventilation gap forms the first communication port, and the first communication port and the second communication port are at least partially staggered in the axial direction of the stator core.

5. Generator stator according to claim 4, wherein the stator core comprises a plurality of lamination packs, the lamination groups are arranged into a hollow cylindrical structure and are provided with the axial air duct, the stator core includes radial ventilation slots extending in a radial direction of the stator core, the plurality of lamination groups include a first lamination group and a second lamination group arranged in an axial direction of the stator core, the axial gap between the first lamination stack and the second lamination stack forms the radial ventilation slots, one end of the radial ventilation groove is directly communicated with the air gap, the other end of the radial ventilation groove is communicated with the cavity, the first lamination stack is provided with the axial air duct, one end of the axial air duct penetrates through the first lamination stack, and the axial air duct and the communication port of the radial ventilation groove form the second communication port.

6. The generator stator according to claim 5, wherein the first communication port is an air inlet, the second communication port is an air outlet, and the second communication port is disposed at an end of the axial air duct close to the radial ventilation groove.

7. Generator stator according to claim 5 or 6, wherein the stator winding comprises a yoke, a side of the yoke facing the generator rotor forming the stator teeth, the stack of laminations comprising a plurality of laminations stacked in a thickness direction, the stacking direction of the plurality of laminations being parallel to the axial direction of the stator core, the laminations comprising teeth and yoke parts connected to the teeth, the teeth of the plurality of laminations stacking to form the stator teeth, the yoke parts of the plurality of laminations stacking to form the yoke, the plurality of laminations comprising first and second laminations, at least one of the yoke parts of the first and second laminations being provided with through-going apertures in the thickness direction, the apertures forming the axial air ducts.

8. Generator stator according to claim 7, wherein the yoke of the first lamination has a dimension in the radial direction of the stator core equal to the dimension of the yoke of the second lamination in this direction, the apertures comprising a first aperture provided with the yoke of the first lamination and a second aperture provided with the yoke of the second lamination, the first and second apertures partially coinciding in the stacking direction, the coinciding portions forming the axial air duct.

9. The generator stator of claim 7 wherein the plurality of laminations includes a third lamination stacked between the first and second laminations, the yoke portion of the third lamination having a smaller dimension in the radial direction of the stator core than the yoke portions of the first and second laminations in that direction, the yoke portions of the first and second laminations forming a gap therebetween, the gap communicating the axial air duct with the cavity, the channel of the cavity communicating the axial air duct with the cavity forming the cavity-side radial segment; and/or

The plurality of laminations include a third lamination stacked between the first and second laminations, a size of the yoke portion of the third lamination in the radial direction of the stator core is equal to a size of the yoke portion of the first lamination and the yoke portion of the second lamination in this direction, the yoke portion of the third lamination is provided with a cavity side through hole communicating the axial air duct with the cavity, and a passage communicating the axial air duct with the cavity forms a cavity side radial section.

10. The generator stator according to any one of claims 2 to 6, wherein the number of the first communication ports is greater than the number of the second communication ports;

and/or

The plurality of axial air ducts are arranged along the circumferential direction of the stator core and are communicated with one another;

and/or

The cooling air duct comprises a winding side radial section extending along the radial direction of the stator core, the winding side radial section is located between the ventilation gap and the axial air duct and communicated with the ventilation gap and the axial air duct, and the winding side radial section and a communication port of the axial air duct form the first communication port.

11. An electrical generator, comprising:

a generator stator as claimed in any one of claims 1 to 10; and