CN220527750U - Stator, motor and wind generating set - Google Patents

Abstract

The application relates to a stator, motor and wind generating set, the stator includes the base, supporting part and stator body, the base has along self axial extension and airtight ring cavity that sets up and respectively with the first opening and the second opening of ring cavity intercommunication, supporting part sets up in ring cavity and with pedestal connection, stator body sets up in ring cavity, the stator body includes the iron core and sets up the coil on the iron core, the iron core separates the ring cavity along radial interval with the base and forms first cavity and second cavity through supporting part, be provided with the radial medium passageway of a plurality of intercommunication first cavity and second cavity on the iron core, thereby can make coolant and iron core and the coil direct contact of setting on the iron core, heat loss is reduced, and the area of contact of iron core and coolant has been increased, and cooling efficiency is improved.

Description

Stator, motor and wind generating set

Technical Field

The application relates to the technical field of wind power, in particular to a stator, a motor and a wind generating set.

Background

The stator of a high voltage motor has high requirements on the insulation grade of the coil, so the thickness of the insulation protection layer of the high voltage coil generally far exceeds the insulation thickness of the stator of a common motor. The increase of the thickness of the insulating layer makes the heat generated by the high-voltage coil unable to be timely emitted, and the phenomenon of motor over-temperature is easy to occur.

The cooling mode of current motor includes forced air cooling and liquid cooling, and wherein forced air cooling can not satisfy the cooling demand of high-voltage motor, and the liquid cooling is higher to the airtight requirement of motor cavity, and current liquid cooling mode only can cool off the iron core surface of intermediate medium or cooling stator simultaneously, and the cooling medium need carry out indirect heat transfer with the iron core earlier, and the heat transfer route is longer, and cooling efficiency is lower.

Disclosure of Invention

The application provides a stator, motor and wind generating set can make coolant and iron core and set up the coil direct contact on the iron core, reduces the heat loss to increased the area of contact of iron core and coolant, improved cooling efficiency.

In one aspect, according to an embodiment of the present application, there is provided a stator including: the base is provided with an annular cavity which extends along the axial direction of the base and is hermetically arranged, and a first opening and a second opening which are respectively communicated with the annular cavity; the support part is arranged in the annular cavity and is connected with the base; the stator body is arranged in the annular cavity and comprises an iron core and a coil arranged on the iron core, the iron core and the base are arranged at intervals along the radial direction, the annular cavity is separated by the supporting part to form a first cavity and a second cavity, and a plurality of radial medium channels which are communicated with the first cavity and the second cavity are arranged on the iron core; the first opening is communicated with the first cavity, the second opening is communicated with the second cavity, a heat exchange path passing through the first cavity, the radial medium channel and the second cavity is formed between the first opening and the second opening, and the iron core and the coil are both positioned in the heat exchange path.

According to an aspect of the embodiment of the application, the core is further provided with an axial medium channel, and the first chamber is communicated with the second chamber sequentially through the axial medium channel and the radial medium channel.

According to one aspect of the embodiment of the application, the iron core is provided with mounting grooves which are distributed at intervals along the circumferential direction of the iron core, the mounting grooves are arranged in an extending mode along the axial direction, and the coil is embedded in the mounting grooves; the gap between the mounting groove and the coil forms an axial medium channel.

According to one aspect of the embodiment of the application, the first chamber comprises sub-chambers positioned at two sides of the second chamber along the axial direction, and each sub-chamber is correspondingly provided with at least one first opening; along the axial direction, the two ends of the coil are respectively arranged in a protruding way relative to the end parts of the iron core and extend into the subchambers at the two sides.

According to an aspect of the embodiments of the present application, the core includes lamination packs alternately arranged in an axial direction, and a flow guide portion, the periphery of the lamination packs being provided with mounting grooves, the flow guide portion being supported between two adjacent lamination packs to form a radial medium passage between the two adjacent lamination packs.

According to one aspect of the embodiment of the present application, the flow guiding portion includes two or more spacer particles, the two or more spacer particles are distributed at intervals along the circumferential direction of the core, and gaps between adjacent two lamination stacks are separated to form a plurality of radial medium channels.

According to one aspect of an embodiment of the present application, the spacer particles are directly connected to the lamination stack; or, the flow guiding part further comprises partition plates which are oppositely arranged along the axial direction, and each partition block is clamped between the partition plates and connected with the lamination stack through the partition plates.

According to one aspect of an embodiment of the present application, the spacer particles are offset from the mounting slots in an orthographic projection of the spacer particles on the lamination stack in an axial direction, the spacer particles extending radially from an outer edge of the lamination stack to an inner edge of the lamination stack.

According to one aspect of an embodiment of the application, spacer particles are arranged between any two mounting grooves in the circumferential direction.

According to one aspect of the embodiment of the application, the base comprises an inner shell, an outer shell and end covers, wherein the inner shell and the outer shell are coaxially arranged, and the end covers are connected to two ends of the inner shell and the outer shell, and the inner shell, the outer shell and the end covers are enclosed to form a closed annular cavity; the support portion is connected to one of the inner shell and the outer shell and extends toward the other.

According to an aspect of the embodiments of the present application, the supporting part includes supporting rings that set up relatively, and the supporting rings sets up in the both ends of iron core along axial, and each supporting ring one end links to each other with the shell, and the other end links to each other with the iron core, and supporting ring, iron core and shell enclose and close and form the second cavity.

According to one aspect of the embodiments of the present application, the number of the second openings is more than two, and the more than two second openings are arranged at intervals along the axial direction and are communicated with the second chamber.

In another aspect, an embodiment of the present application provides an electric machine, which is a generator or an electric motor, including a rotor, and a stator in the above embodiment, where the rotor is rotatably disposed on a base of the stator and is disposed coaxially with the stator.

In yet another aspect, a wind generating set is provided according to an embodiment of the present application, including the generator in the foregoing embodiment.

This embodiment improves through the cooling structure to the stator for the stator body sets up in inclosed annular cavity, in order to cool off the stator body through the mode of liquid cooling, the stator body separates annular cavity through the supporting part simultaneously and forms first cavity and second cavity, first cavity and second cavity are linked together through the radial medium passageway on the iron core of stator body, so coolant can with the iron core and set up the coil direct contact on the iron core when getting into the second cavity by first cavity, thereby reduce heat loss, and through setting up a plurality of radial medium passageway on the iron core, increased the area of contact of iron core and coolant, improve cooling efficiency.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of an electric motor provided in one embodiment of the present application;

FIG. 2 is a cross-sectional view of an iron core provided in one embodiment of the present application;

FIG. 3 is a side view of a core provided in one embodiment of the present application;

fig. 4 is an enlarged view at a in fig. 2;

FIG. 5 is a side view of a baffle provided in one embodiment of the present application;

FIG. 6 is an enlarged view of a portion of a baffle provided in one embodiment of the present application;

FIG. 7 is a cross-sectional view taken along the direction C-C in FIG. 5;

fig. 8 is an enlarged view at B in fig. 7;

fig. 9 is a cross-sectional view of a motor provided in another embodiment of the present application.

In the accompanying drawings:

10-a stator; 20-rotor;

1-a base; 11-an inner shell; 12-a housing; 13-end caps; 2-a support; 3-a stator body; 31-iron core; 311-lamination stack; 312-a deflector; 3121-spacer; 3122-separator; a 32-coil;

s1-a first chamber; s11-a subchamber; s2-a second chamber; p1-axial media passage; p2-radial media channels; k-mounting grooves; c1-a first opening; c2_second openings;

x-axis direction; y-radial direction.

In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.

Detailed Description

Features and exemplary embodiments of various aspects of the present application are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing an example of the present application. In the drawings and the following description, at least some well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present application; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The directional terms appearing in the following description are all directions shown in the drawings and are not intended to limit the stator, motor and wind turbine of the present application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected. The specific meaning of the terms in the present application can be understood as appropriate by one of ordinary skill in the art.

For a better understanding of the present application, a stator, a motor and a wind turbine according to embodiments of the present application are described in detail below with reference to fig. 1 to 9.

Referring to fig. 1, the embodiment of the application discloses a stator 10, including a base 1, a supporting portion 2 and a stator body 3, the base 1 has an annular cavity extending along an axial direction X of the base and being hermetically arranged, and a first opening C1 and a second opening C2 respectively communicating with the annular cavity, the supporting portion 2 is arranged in the annular cavity and is connected with the base 1, the stator body 3 is arranged in the annular cavity, the stator body 3 includes an iron core 31 and a coil 32 arranged on the iron core 31, the iron core 31 and the base 1 are arranged along a radial direction Y at intervals, the annular cavity is separated by the supporting portion 2 to form a first cavity S1 and a second cavity S2, and a plurality of radial medium channels P2 communicating with the first cavity S1 and the second cavity S2 are arranged on the iron core 31. The first opening C1 is communicated with the first chamber S1, the second opening C2 is communicated with the second chamber S2, a heat exchange path passing through the first chamber S1, the radial medium channel P2 and the second chamber S2 is formed between the first opening C1 and the second opening C2, and the iron core 31 and the coil 32 are both located in the heat exchange path.

This embodiment improves through the cooling structure to stator 10 for stator body 3 sets up in inclosed annular cavity, with cool off stator body 3 through the mode of liquid cooling, stator body 3 separates annular cavity through supporting part 2 simultaneously and forms first cavity S1 and second cavity S2, first cavity S1 and second cavity S2 are linked together through radial medium passageway P2 on stator body 'S the iron core 31, so coolant can be with iron core 31 and the coil 32 direct contact of setting on iron core 31 when getting into second cavity S2 by first cavity S1, thereby reduce heat loss, and through set up a plurality of radial medium passageway P2 on iron core 31, increased iron core 31 and coolant' S area of contact, improve cooling efficiency.

Optionally, the cooling medium may be set to be insulating oil, and compared with a water cooling mode, oil cooling performed by using the insulating oil can play a certain role in protecting the stator body 3, maintain the insulating performance of the stator body 3, reduce the corrosion protection process requirements of the internal structural members of the stator 10, even realize no corrosion protection process treatment, be beneficial to reducing the cost, and improve the service life of the stator 10. It should be noted that, in the embodiment of the present application, the stator 10 may form a sealing structure for liquid cooling, but in actual use, the cooling medium may be set to be an insulating gas such as hydrogen, and the selection of the cooling medium may be adjusted according to the actual cooling requirement, which should not be construed as limiting the protection scope of the present application.

In addition, in the application, the stator 10 and the rotor 20 are cooled and separated, namely, the annular cavity of the base 1 is only used for arranging the stator body 3, and the stator body 3 is a static component, so that a closed annular cavity can be formed in the base 1 in a conventional sealing mode, the cooling structure of the stator 10 is simplified, and the cost is reduced. The rotor 20 may be cooled by liquid cooling or air cooling, and may be adjusted according to the amount of heat generated by the rotor 20, which is not particularly limited in this application.

With respect to the cooling structure of the stator 10, it is understood that the stator body 3 separates the annular cavity by the supporting portion 2 to form the first cavity S1 and the second cavity S2, which means that, since the core 31 and the base 1 are disposed at intervals along the radial direction Y, when the core 31 is connected to the base 1 by the supporting portion 2, the supporting portion 2 can close the area between the core 31 and the base 1, so that an independent cavity structure is formed by separating the annular cavity.

For convenience of description, an area not closed by the support portion 2 is defined as a first chamber S1, and an area closed by the support portion 2 is defined as a second chamber S2.

Referring to fig. 1 to 3, in some alternative embodiments, the iron core 31 is provided with mounting slots K circumferentially spaced apart from each other, the mounting slots K extending in the axial direction X, and the coils 32 are embedded in the mounting slots K. The clearance between the mounting groove K and the coil 32 forms an axial medium channel P1, and the first chamber S1 is communicated with the second chamber S2 sequentially through the axial medium channel P1 and the radial medium channel P2, so that the contact area between the inside of the iron core 31 and the cooling medium is further increased, the inside of the iron core 31 can be completely permeated and cooled by the cooling medium, and the cooling uniformity of the iron core 31 is ensured.

In addition, since the end of the coil 32 is a nonlinear segment, there are many corners or joints, and the insulation protection layer at the end of the coil 32 has a partially uneven thickness, by forming the axial medium channel P1 in the core 31, it is possible to ensure that the cooling medium passes through the end of the coil 32, thereby realizing efficient cooling of the end of the coil 32, and further ensuring the cooling effect of the stator 10.

The first opening C1 may be a liquid inlet, and the first opening C1 may also be a liquid outlet.

Taking the first opening C1 as an example of a liquid inlet, after the cooling medium enters the first chamber S1 through the first opening C1, the cooling medium enters the mounting groove K of the iron core 31 and cools the end of the coil 32, and then enters the iron core 31 from the axial medium channel P1 between the mounting groove K and the coil 32, and then enters the plurality of radial medium channels P2 of the iron core 31, so as to cool the inside of the iron core 31 and the linear part of the coil 32, and then flows out from the second opening C2 of the second chamber S2 to the outside of the stator 10. After this, the cooling medium can enter the annular cavity again from the first opening C1 after heat exchange, thereby cyclically reciprocating to continuously effect cooling of the stator 10.

In the present embodiment, the axial medium passage is described as being formed directly by the mounting groove and the coil, it should be understood that the axial medium passage may also be formed by an axial through hole provided in the core.

To further improve the cooling efficiency, in some alternative embodiments, the first chamber S1 includes sub-chambers S11 located at two sides of the second chamber S2 along the axial direction X, where each sub-chamber S11 is correspondingly provided with at least one first opening C1, and two ends of the coil 32 are respectively protruded from the end of the core 31 along the axial direction X and extend into the sub-chambers S11 at two sides.

By providing the plurality of first openings C1 on the base 1, the cooling medium can enter the sub-chamber S11 from each first opening C1 at the same time, and directly cool the end portions of the coil 32 extending into the sub-chamber S11 at both sides, so as to further improve the cooling effect on the end portions of the coil 32. After the end portions of the coil 32 are cooled, the cooling medium in the sub-chambers S11 on both sides can enter the axial medium passage P1 in the core 31 in opposite directions and merge into the radial medium passage P2, thereby shortening the flow path of the cooling medium on one side and improving the cooling efficiency.

Optionally, the number of the first openings C1 of the sub-chambers S11 on both sides is the same and symmetrically arranged along the axial direction, so as to ensure that the cooling medium can symmetrically enter the axial medium channel P1 from the sub-chambers S11 on both sides, thereby ensuring the cooling uniformity of the stator body 3.

Referring to fig. 2 to 3, in order to form a plurality of radial medium passages P2 on the core 31, in some alternative embodiments, the core 31 includes lamination groups 311 alternately arranged along the axial direction X, and a guide portion 312, the periphery of the lamination groups 311 being provided with a mounting groove K, the guide portion 312 being supported between two adjacent lamination groups 311 to form the radial medium passages P2 between the two adjacent lamination groups 311.

The lamination group 311 may include a plurality of lamination sheets stacked along the axial direction X, the lamination structure and the lamination sheet with the shape the same as the minimum unit structure of the conventional iron core 31 in the field, and the lamination sheet may be made of silicon steel sheet, and after punching, the lamination sheets are coaxially stacked to form the lamination group 311, and the lamination group 311 is connected and combined by the flow guiding portion 312 to form the iron core 31.

The iron core 31 in this embodiment of the present application forms radial medium channel P2 by supporting lamination stack 311 with guide 312, and compared with the mode of directly forming radial holes on iron core 31, the electromagnetic performance of the motor can be prevented from being affected by punching holes on iron core 31, and the manufacturing difficulty can be simplified, and the cost can be reduced.

In some alternative embodiments, the flow guiding portion 312 may be configured in a wave structure, where the wave structure includes convex portions and concave portions that are alternately arranged, so that when the flow guiding portion 312 is sandwiched between two adjacent lamination stacks 311, the convex portions of the wave structure can abut against the surface of the lamination stack 311, and form a radial medium channel P2 by enclosing the concave portions with the lamination stacks 311.

When the guiding portion 312 is configured as a wave structure, the orthographic projection of the guiding portion 312 in the axial direction X may coincide with the orthographic projection of the lamination stack 311 in the axial direction X, for example, the lamination may be directly punched to form a wave structure, which can ensure the stability of the wave structure after the iron core 31 is formed.

Referring to fig. 4 to 6, in other alternative embodiments, the flow guiding portion 312 includes more than two spacer blocks 3121, the more than two spacer blocks 3121 are circumferentially spaced apart, and gaps between two adjacent lamination sets 311 are separated to form a plurality of radial medium channels P2, and the plurality of radial medium channels P2 are radially distributed with respect to the axis of the stator 10, so that the cooling liquid can uniformly flow into the second cavity S2 that is annularly arranged along the plurality of radial medium channels P2, and cooling uniformity of the stator 10 is ensured.

When the flow guiding portion 312 is provided with more than two spacer particles 3121, the spacer particles 3121 may be directly connected to the lamination stack 311, or the flow guiding portion 312 further includes spacers 3122 disposed opposite to each other in the axial direction X, and each spacer particle 3121 is sandwiched between the spacers 3122 and connected to the lamination stack 311 through the spacers 3122. By providing the spacer 3122, two or more spacer particles 3121 can be fixed to the spacer 3122, thereby facilitating the preparation of the flow guide 312. Alternatively, the oppositely disposed spacer plates 3122 and the respective spacer particles 3121 sandwiched between the spacer plates 3122 may be provided as a unitary structure to facilitate the manufacture of the flow guide 312 and its connection to the lamination stack 311.

Further, the orthographic projection of the spacer 3122 in the axial direction X may coincide with the orthographic projection of the lamination stack 311 in the axial direction X, that is, the groove shape of the spacer 3122 is consistent with the lamination stack, so as to facilitate the alignment connection of the flow guiding portion 312 and the lamination stack 311.

Referring to fig. 7 and 8, in some alternative embodiments, the orthographic projection of spacer particles 3121 onto lamination stack 311 along axial direction X is offset from mounting groove K, spacer particles 3121 extending from the outer edge of lamination stack 311 along radial direction Y to the inner edge of lamination stack 311.

Since the lamination stack 311 is provided with the plurality of mounting grooves K, winding teeth with one end suspended are formed between the mounting grooves K, and the spacer 3121 is made to avoid the mounting grooves K and extend from the outer edge of the lamination stack 311 to the inner edge of the lamination stack 311, so that the spacer 3121 can support the winding teeth, thereby ensuring the reliability of the iron core 31.

Further, spacer particles 3121 are provided between any two mounting grooves K in the circumferential direction, so that it is ensured that each winding tooth can be supported by the spacer particles 3121, further improving the reliability of the iron core 31. And, all correspond to the axial medium passageway P1 that forms of arbitrary mounting groove K and be formed with radial medium passageway P2 to form a plurality of heat exchange paths in iron core 31, increased the area of contact of iron core 31 inside and coolant, make the inside cooling medium that can be fully permeated by the coolant of iron core 31 cool off, guarantee the homogeneity of iron core 31 cooling.

Referring to fig. 1 and 9, it can be appreciated that the stator 10 in the embodiment of the present application is applicable to a motor structure of an inner rotor of an outer stator, and also applicable to a motor structure of an inner stator of an outer rotor. Specifically, the base 1 includes an inner shell 11 and an outer shell 12 coaxially disposed, and end caps 13 connected to both ends of the inner shell 11 and the outer shell 12, the inner shell 11, the outer shell 12, and the end caps 13 enclose a closed annular cavity, and the support portion 2 is connected to one of the inner shell 11 and the outer shell 12 and extends toward the other.

In this case, since the inner casing 11 is sandwiched between the stator body 3 and the rotor 20, the inner casing 11 may be made of a non-magnetic material, such as stainless steel, so as to avoid the influence of the inner casing 11 on the electromagnetic performance of the motor, and meanwhile, the thickness of the inner casing 11 may be adjusted according to the radial air gap between the stator 10 and the rotor 20, such as 2mm-3mm when the radial air gap between the stator 10 and the rotor 20 is set to 5mm, and the specific value thereof may be adjusted according to the actual size structure of the motor, which is not particularly limited in this application.

Fig. 9 is a schematic diagram of a motor structure of an inner stator of an outer rotor, and when the rotor 20 is sleeved on the outer periphery of the stator 10, the supporting portion 2 may be connected to the inner housing 11, and a gap between the iron core 31 and the inner housing 11 along the radial direction Y is enclosed to form a second chamber S2. Similar to the motor structure of the outer stator inner rotor, since the housing 12 is sandwiched between the stator body 3 and the rotor 20, the housing 12 may be made of a non-magnetic material, such as stainless steel, and the thickness of the housing 12 may be adjusted according to the actual size structure of the motor, which can prevent the housing 12 from affecting the electromagnetic performance of the motor.

For convenience of description, the motor structure of the inner rotor of the outer stator will be described below as an example.

In some alternative embodiments, the supporting portion 2 includes oppositely disposed supporting rings, the supporting rings are disposed at two ends of the core 31 along the axial direction X, and one end of each supporting ring is connected to the housing 12, and the other end is connected to the core 31, and the supporting rings, the core 31, and the housing 12 enclose a second chamber S2.

It will be appreciated that the support ring may be integrally provided with the base 1, or alternatively, the support ring may be integrally provided with the core 31, for example, when lamination of the core 31 is performed, the support rings protruding radially are directly provided at both ends of the core 31 in the axial direction X, so that connection of the support portion 2 with the core 31 and the base 1 is facilitated. In addition, in order to ensure the tightness of the second chamber S2, the support ring may be connected to the core 31 or the base 1 by adopting a welding manner, and a sealing glue or a sealing ring may be further adopted at an interface between the support ring and the core 31 or the base 1 to seal, so as to ensure that the cooling liquid in the first chamber S1 can only enter the second chamber S2 through the radial medium channel P2.

In some alternative embodiments, the number of second openings C2 is more than two, and the more than two second openings C2 are spaced apart along the axial direction X and each communicate with the second chamber S2. Through setting up the second opening C2 more than two along axial X interval on base 1 to guarantee that the velocity of flow of the coolant liquid in each region of second cavity S2 along axial X tends to unanimously, and make the coolant liquid can evenly follow second opening C2 and flow, improve stator 10 refrigerated homogeneity.

Optionally, the base 1 further includes an oil outlet pipe, into which the cooling liquid flowing out of each second opening C2 can flow, and enter the annular cavity of the stator 10 again from the first opening C1 after heat exchange from the outside, thereby constituting a circulating heat exchange path.

The embodiment of the application also discloses a motor, which is a generator or a motor, and comprises a rotor 20 and the stator 10 in the above embodiment, wherein the rotor 20 is rotatably arranged on the base 1 of the stator 10 and is coaxially arranged with the stator 10.

It can be understood that, in the motor according to the embodiment of the present application, the stator 10 is cooled and separated from the rotor 20, the stator 10 may be cooled by adopting the cooling structure of the stator 10 in the embodiment described above, the rotor 20 may be cooled by adopting a liquid cooling manner, and may also be cooled by adopting an air cooling manner, which is not limited in this application.

The generator may be a high-voltage doubly-fed generator, and since the generator includes the stator 10 in the above embodiment, the generator can cool the stator 10 in a liquid cooling manner, so that the inside of the core 31 of the stator 10 can be completely cooled by the cooling medium in a penetrating manner, thereby greatly enhancing the cooling efficiency and ensuring the cooling of the high-voltage coil 32.

The embodiment of the application also discloses a wind generating set, which comprises the generator in the embodiment, so that the wind generating set has the advantages of high cooling efficiency, long service life and the like of the generator, and is easy to popularize and use.

While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (14)

1. A stator, comprising:

the base (1) is provided with an annular cavity extending along the axial direction of the base and being hermetically arranged, and a first opening and a second opening which are respectively communicated with the annular cavity;

the support part (2) is arranged in the annular cavity and is connected with the base (1);

the stator body (3) is arranged in the annular cavity, the stator body (3) comprises an iron core (31) and a coil (32) arranged on the iron core (31), the iron core (31) and the base (1) are arranged at intervals along the radial direction, the annular cavity is separated by the supporting part (2) to form a first cavity and a second cavity, and a plurality of radial medium channels which are communicated with the first cavity and the second cavity are arranged on the iron core (31);

wherein the first opening is communicated with the first chamber and the second opening is communicated with the second chamber, a heat exchange path passing through the first chamber, the radial medium channel and the second chamber is formed between the first opening and the second opening, and the iron core (31) and the coil (32) are both positioned in the heat exchange path.

2. Stator according to claim 1, characterized in that the core (31) is further provided with an axial medium channel, the first chamber being in communication with the second chamber via the axial medium channel and the radial medium channel in sequence.

3. The stator according to claim 2, characterized in that the iron core (31) is provided with mounting grooves circumferentially spaced apart from each other, the mounting grooves extending in the axial direction, the coils (32) being embedded in the mounting grooves;

the gap between the mounting groove and the coil (32) forms the axial medium passage.

4. The stator according to claim 1, wherein the first chamber includes sub-chambers located on both sides of the second chamber in the axial direction, each of the sub-chambers being provided with at least one of the first openings in correspondence;

along the axial direction, two ends of the coil (32) are respectively arranged in a protruding way relative to the end parts of the iron core (31) and extend into the subchambers at two sides.

5. A stator according to any one of claims 1 to 4, characterized in that the core (31) comprises lamination packs (311) and flow guides (312) alternately arranged in the axial direction, the periphery of the lamination packs (311) being provided with mounting grooves, the flow guides (312) being supported between adjacent two lamination packs (311) to form the radial medium passage between adjacent two lamination packs (311).

6. The stator according to claim 5, characterized in that the flow guide portion (312) comprises two or more spacer particles (3121), the two or more spacer particles (3121) being distributed at intervals along the circumferential direction of the core (31) and separating the gaps of adjacent two lamination stacks (311) to form a plurality of the radial medium channels.

7. The stator according to claim 6, characterized in that the spacer particles (3121) are directly connected to the lamination stack (311);

alternatively, the flow guiding part (312) further comprises a partition plate (3122) oppositely arranged along the axial direction, and each partition block (3121) is sandwiched between the partition plates (3122) and connected with the lamination stack (311) through the partition plates (3122).

8. The stator according to claim 6, characterized in that the spacer particles (3121) are offset from the mounting groove in an orthographic projection of the spacer particles (3121) on the lamination stack (311) in the axial direction, the spacer particles (3121) extending from the outer edge of the lamination stack (311) to the inner edge of the lamination stack (311) in the radial direction.

9. A stator according to claim 8, characterized in that the spacer particles (3121) are arranged between any two of the mounting grooves in the circumferential direction.

10. The stator according to claim 1, characterized in that the base (1) comprises an inner shell (11) and an outer shell (12) which are coaxially arranged, and end covers (13) connected to both ends of the inner shell (11) and the outer shell (12), wherein the inner shell (11), the outer shell (12) and the end covers (13) enclose to form the closed annular cavity;

the support part (2) is connected to one of the inner shell (11) and the outer shell (12) and extends toward the other.

11. The stator according to claim 10, wherein the supporting portion (2) includes oppositely disposed supporting rings disposed at both ends of the core (31) in the axial direction, one end of each supporting ring is connected to the housing (12), the other end is connected to the core (31), and the supporting rings, the core (31), and the housing (12) enclose to form the second chamber.

12. The stator of claim 11, wherein the number of second openings is two or more, the two or more second openings being spaced apart along the axial direction and each communicating with the second chamber.

13. An electric machine, which is a generator or an electric motor, characterized in that it comprises a rotor (20) and a stator (10) according to any one of claims 1 to 12, said rotor (20) being rotatably arranged to the base (1) of said stator (10) and being coaxially arranged to said stator (10).

14. A wind power plant comprising a generator as claimed in claim 13.