CN212033942U

CN212033942U - Motor and wind generating set

Info

Publication number: CN212033942U
Application number: CN202021029155.5U
Authority: CN
Inventors: 彭亮
Original assignee: Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Current assignee: Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2020-11-27
Anticipated expiration: 2030-06-08

Abstract

The utility model relates to a motor and wind generating set. The motor includes: the stator comprises radial channels which are distributed at intervals along the axial direction of the stator; the rotor is coaxial with the stator, and an air gap is formed between the rotor and the stator along the radial direction; the rotor bracket is provided with a first air inlet along one axial end; the stator support is in dynamic sealing connection with the rotor support to form a first ventilation chamber and a second ventilation chamber which are positioned at two axial ends of the motor and communicated with the air gap, and the first air inlet is communicated with the first ventilation chamber; the stator support is also provided with a first cavity and a second cavity which are not communicated with each other along the circumferential direction of the stator support, the first cavity is communicated with the radial channel, and the first cavity is provided with a first air outlet; the second chamber is located the radial inboard of first chamber, and the second chamber is provided with second air intake and second air outlet, and second air outlet and second ventilation chamber intercommunication. The motor forms a cooling channel communicated with the external environment in the structure, and the whole structure is simple and compact, and occupies small space.

Description

Motor and wind generating set

Technical Field

The utility model relates to a wind power generation technical field especially relates to a motor and wind generating set.

Background

Wind power generation is one of the closest renewable energy technologies to commercialization, and is the focus of renewable energy development. The motor in the wind generating set has heat loss in the operation process, and the heat loss mainly comprises the following steps: electromagnetic losses, i.e., joule heating in the winding due to ohmic resistance, i.e., copper losses; hysteresis loss and eddy current loss in the iron core, etc., i.e., iron loss; and unavoidable stray losses; if the motor is a permanent magnet motor, the loss of magnetic poles is also included. These losses cause the motor to release a large amount of heat during operation, and the heat will not only cause a certain impact on the motor itself and its insulation structure, resulting in a shortened insulation life, even insulation failure, but also in a continuous decrease in the output power of the motor.

Among the cooling modes adopted by the wind generating set, the air cooling mode utilizes the convection of natural wind for heat dissipation, has the advantages of high reliability, easy maintenance and no pollution, can simplify the structure of the wind generating set, and is widely applied to high-altitude, dry and low-temperature areas.

Disclosure of Invention

The utility model aims at providing a motor and wind generating set, this motor is at the inside cooling channel who forms and external environment intercommunication of self structure, and overall structure is simple, compact, occupation space is little.

In one aspect, the utility model provides a motor, include: the stator comprises radial channels which are distributed at intervals along the axial direction of the stator; the rotor is coaxial with the stator, and an air gap is formed between the rotor and the stator along the radial direction; the rotor support is fixed on the rotating shaft through the rotor support, and one end of the rotor support in the axial direction is provided with a first air inlet; the stator is fixed on the fixed shaft through the stator bracket, and a bearing is arranged between the rotating shaft and the fixed shaft; the stator support is connected with the rotor support in a dynamic sealing mode to form a first ventilation chamber and a second ventilation chamber which are located at two axial ends of the motor and communicated with the air gap, and the first air inlet is communicated with the first ventilation chamber; the stator support is also provided with a first cavity and a second cavity which are not communicated with each other along the circumferential direction of the stator support, the first cavity is communicated with the radial channel, and the first cavity is provided with a first air outlet; the second chamber is positioned on the radial inner side of the first chamber, the second chamber is provided with a second air inlet and a second air outlet, and the second air outlet is communicated with the second ventilation chamber; the first ventilation chamber, the second ventilation chamber, the air gap, the radial channel, the first chamber and the second chamber form a cooling channel communicated with the external environment through the first air inlet, the second air outlet and the first air outlet.

According to one aspect of the utility model, the rotor support comprises a first annular plate extending along the axial direction and a first rotor end plate and a second rotor end plate which are arranged at the two axial ends of the first annular plate, a first air inlet is arranged on the first rotor end plate, and the rotor support is connected with the stator support in a dynamic sealing way through the second rotor end plate; the rotor includes rotor yoke and sets up the magnetic pole on rotor yoke, and rotor yoke is located the one side of first annular plate orientation stator.

According to an aspect of the utility model, the stator support includes along the backup pad of radial extension, first support plate and the second support plate of being connected with the backup pad, forms first cavity between first support plate and the stator, and the second support plate is located the radial inboard of first support plate, and second support plate, first support plate and backup pad formation second cavity.

According to an aspect of the utility model, first support plate includes along the second annular plate of axial extension, be located the axial both ends of second annular plate and along radial outside first stator end plate and the second stator end plate that extends, and be connected with first stator end plate and follow the first connecting plate of axial extension, be connected with second stator end plate and follow the second connecting plate of axial extension, the second annular plate is connected with the backup pad, the axial both ends of stator are supported respectively to first connecting plate and second connecting plate, the second annular plate, first stator end plate, second stator end plate and stator enclose to close and form first cavity.

According to an aspect of the present invention, a passage communicating with the first ventilation chamber is formed between the first connection plate and the first rotor end plate.

According to an aspect of the utility model, the second connecting plate is connected with the second rotor end plate dynamic seal, and second mounting panel, backup pad and first mounting panel form the second cavity towards one side of second connecting plate.

According to the utility model discloses an aspect is provided with the second air intake with second cavity intercommunication in the backup pad, is provided with the second air outlet with second ventilation cavity intercommunication on the second connecting plate.

According to the utility model discloses an aspect, the quantity of first cavity is a plurality of, and a plurality of first cavities just communicate each other along stator support's circumference interval distribution, is provided with first air outlet on the second annular plate of at least one of them first cavity, and the radial inboard of all the other first cavities is provided with the second cavity.

On the other hand, the utility model also provides a wind generating set, this wind generating set includes: according to the motor, two ends of the motor in the axial direction of the motor are provided with a windward side and a leeward side which are opposite, and a first air inlet of the motor is positioned on the windward side; the impeller is positioned on the windward side of the motor and is coaxially arranged with the motor, and the impeller drives the motor to rotate; and the engine room is positioned on the leeward side of the motor and is provided with a ventilation opening and a ventilation channel, one end of the ventilation channel is communicated with the first air outlet of the motor, and the other end of the ventilation channel is communicated with the ventilation opening.

According to an aspect of the utility model, the impeller includes wheel hub, sets up the blade on wheel hub and sets up in the kuppe of wheel hub periphery side, is provided with ventilative sealing member between the rotor support of kuppe and motor and between kuppe and the blade respectively.

The utility model provides a pair of motor, set up first cavity and the second cavity that does not communicate each other in stator support's circumference, axial one end at rotor support sets up first air intake, set up the second air intake at the second cavity, and the first ventilation cavity intercommunication of first air intake and motor axial one end, the second cavity communicates with the second ventilation cavity of the motor axial other end, first cavity communicates with the stator along self axial interval distribution's radial channel, and first cavity is provided with first air outlet, make cooling air among the external environment get into first ventilation cavity through first air intake, converge after getting into second ventilation cavity through the second air intake, then get into first cavity behind the inside heating component of motor of flowing through, and flow out from first air outlet. The motor forms a cooling channel communicated with the external environment in the structure, and the whole structure is simple and compact, and occupies small space. Additionally, the utility model provides a pair of wind generating set adopts this motor, need not to dispose special cooling arrangement for the motor, reduces unit itself from power consumptive, reduces complete machine cost and complete machine load, and the cost is lower, has improved wind generating set's reliability and maintainability.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Fig. 1 is a schematic view of a longitudinal section structure of a motor along an angle according to an embodiment of the present invention;

FIG. 2 is a schematic longitudinal cross-sectional view of the motor of FIG. 1 taken at another angle;

fig. 3 is a schematic structural diagram of a wind turbine generator system according to an embodiment of the present invention;

fig. 4 is an enlarged structural view of a region B in fig. 3.

Description of reference numerals:

a motor-1; an impeller-2; a hub-21; a blade-22; a dome-23; a nacelle-3; an air duct-31; vent-32; a seal 4; a tower-T;

a stator-11; radial channel-11 a; -111 of core components; stator winding-112; an air gap-A; a first ventilation chamber-a 1; a second vent chamber-a 2;

a rotor-12;

a rotor support-13; a first air inlet-13 a; a first annular plate-133; a first rotor end plate-131; a second rotor end plate-132;

a stator support-14; a first chamber-14 a; a second chamber-14 b; a first air outlet-141 a; a second air inlet-142 a; a second outlet-142 b; a first brace panel-141; a second bracket plate-142; a support plate-143; a first stator end plate-1411; a second stator end plate-1412; a second annular plate-1413; a first connecting plate-1414; a second connecting plate-1415;

a fixed shaft-15; a bearing-16.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be 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 invention. It will be apparent, however, to one skilled in the art that the present invention 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 invention by illustrating examples of the invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; 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 words appearing in the following description are directions shown in the drawings, and do not limit the specific structure of the motor and the wind turbine generator system of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

For better understanding of the present invention, the following describes the motor and the wind turbine generator system provided by the embodiments of the present invention in detail with reference to fig. 1 to 3.

Fig. 1 is a schematic diagram of a longitudinal section structure of a motor along one angle according to an embodiment of the present invention, and fig. 2 is a schematic diagram of a longitudinal section structure of the motor along another angle in fig. 1.

Referring to fig. 1 and fig. 2 together, an embodiment of the present invention provides a motor 1, where the motor 1 may be a permanent magnet motor or an electrically excited motor. The motor 1 can be an outer rotor structure and an inner stator structure, and can also be an outer stator structure and an inner rotor structure. For convenience of description, the embodiment of the present invention is described by taking a permanent magnet motor having an outer rotor and an inner stator structure as an example.

The motor 1 includes: stator 11, rotor 12, rotor support 13 and stator support 14. The stator 11 is fixed on a fixed shaft 15 through a stator bracket 14, the rotor 12 is fixed on a rotating shaft (not shown) through a rotor bracket 13, and a bearing 16 is arranged between the fixed shaft 15 and the rotating shaft to realize the relative rotation of the two.

The stator 11 comprises radial channels 11a axially spaced along itself. Specifically, the stator 11 includes a plurality of stator cores 111 arranged at intervals in the axial direction and stator windings 112 wound around the plurality of stator cores 111, and the radial passage 11a is formed between each adjacent two of the stator cores 111.

The rotor 12 is disposed coaxially with the stator 11, and an air gap a is formed between the rotor 12 and the stator 11 in the radial direction.

The rotor bracket 13 is provided with a first air inlet 13a at one axial end. For a permanent magnet machine, the rotor 12 comprises a rotor yoke and poles arranged on the rotor yoke, which is located on the rotor support 13. The stator winding 112, the stator core 111, and the magnetic poles are all heat generating components.

The stator bracket 14 is connected with the rotor bracket 13 in a dynamic sealing manner to form a first ventilation chamber a1 and a second ventilation chamber a2 which are located at two axial ends of the motor 1 and are communicated with the air gap a, and the first air inlet 13a is communicated with the first ventilation chamber a 1.

The stator support 14 is also provided with a first cavity 14a and a second cavity 14b which are not communicated with each other along the circumferential direction, the first cavity 14a is communicated with the radial channel 11a, and the first cavity 14a is provided with a first air outlet 141 a; the second chamber 14b is located radially inside the first chamber 14a, the second chamber 14b is provided with a second intake port 142a and a second outtake port 142b, and the second outtake port 142b communicates with the second ventilation chamber a 2.

The first ventilation chamber a1, the second ventilation chamber a2, the air gap a, the radial passage 11a, the first chamber 14a, and the second chamber 14b form a cooling passage communicating with the external environment through the first air inlet 13a, the second air inlet 142a, the second air outlet 142b, and the first air outlet 141 a.

As shown in fig. 1 and 2, the cooling process of the motor 1 is as follows: outside incoming air gets into inside the motor 1 through first air intake 13a, is divided into two air currents simultaneously: one of the airflows directly enters the first ventilation chamber a1 at one axial end (i.e., the right side in fig. 2) of the motor 1 along the arrow in fig. 2; another air flow enters the second chamber 14b through the second air inlet 142a, then enters the second ventilation chamber a2 at the other axial end (i.e. the left side of fig. 2) of the motor 1 through the second air outlet 142b along the arrow in fig. 2, the two air flows entering the first ventilation chamber a1 and the second ventilation chamber a2 converge at the gap a between the rotor 12 and the stator 11, and flow together through the plurality of radial channels 11a distributed at intervals along the axial direction to cool the heat generating components of the motor 1 and then enter the first chamber 14a, and the heated air flow diffuses the heat to the external environment through the first air outlet 141a, thereby cooling the motor 1.

The embodiment of the utility model provides a motor 1, set up first cavity 14a and second cavity 14b that do not communicate each other in stator support 14's circumference, set up first air intake 13a at rotor support 13's axial one end, set up second air intake 142a at second cavity 14b, and first air intake 13a communicates with motor 1's axial one end's first ventilation cavity A1, second cavity 14b communicates with motor axial other end's second ventilation cavity A2, first cavity 14a communicates with stator 11 along self axial interval distribution's radial passageway 11a, and first cavity 14a is provided with first air outlet 141a, make the cooling air in the external environment get into first ventilation cavity A1 through first air intake 13a, get into second ventilation cavity A2 through second air intake 142a and converge, then get into first cavity 14a after the inside heating component of motor flows through, and flows out of the first outlet port 141 a. The motor 1 forms a cooling channel communicated with the external environment in the structure, and has the advantages of simple and compact integral structure and small occupied space.

The following describes in detail a specific structure of the motor 1 according to an embodiment of the present invention with reference to fig. 1 and 2.

As shown in fig. 1 and 2, the rotor frame 13 includes a first annular plate 133 extending in the axial direction, and a first rotor end plate 131 and a second rotor end plate 132 disposed at both ends of the first annular plate 133 in the axial direction, the first rotor end plate 131 is provided with a first air inlet 13a, and the rotor frame 13 is connected with the stator frame 14 in a dynamic sealing manner through the second rotor end plate 132. For a permanent magnet machine, the rotor yoke is located on the side of the first annular plate 133 facing the stator 11.

The stator frame 14 includes a support plate 143 extending in a radial direction, a first frame plate 141 and a second frame plate 142 connected to the support plate 143, the first frame plate 141 and the stator 11 forming a first chamber 14a therebetween; the second yoke plate 142 is located radially inward of the first yoke plate 141, and the second yoke plate 142, the first yoke plate 141 and the support plate 143 form a second chamber 14 b.

Specifically, the first bracket plate 141 includes a second annular plate 1413 extending in the axial direction, a first stator end plate 1411 and a second stator end plate 1412 located at both ends of the second annular plate 1413 in the axial direction and extending radially outward, and a first connection plate 1414 connected to the first stator end plate 1411 and extending in the axial direction, a second connection plate 1415 connected to the second stator end plate 1412 and extending in the axial direction, the second annular plate 1413 is connected to the support plate 143, the first connection plate 1414 and the second connection plate 1415 support both ends of the stator 11 in the axial direction, and the second annular plate 1413, the first stator end plate 1411, the second stator end plate 1412 and the stator 11 enclose the first chamber 14 a.

Further, a passage communicating with the first ventilation chamber a1 is formed between the first connection plate 1414 and the first rotor end plate 131.

The second connecting plate 1415 is connected to the second rotor end plate 132 in a dynamic sealing manner, and the second bracket plate 142, the support plate 143, and the first bracket plate 141 form a second chamber 14b on a side facing the second connecting plate 1415.

The supporting plate 143 is provided with a second air inlet 142a communicating with the second chamber 14b, and the second connecting plate 1415 is provided with a second air outlet 142b communicating with the second ventilating chamber a 2.

The number of the first chambers 14a is plural, the plural first chambers 14a are distributed at intervals along the circumferential direction of the stator support 14 and are communicated with each other, wherein the second annular plate 1413 of at least one first chamber 14a is provided with a first air outlet 141a, and the radial inner sides of the rest first chambers 14a are provided with second chambers 14 b.

It should be noted that, although the motor 1 is described as an outer rotor and inner stator structure as an example for convenience of description, it should be understood that the above-mentioned operation principle of motor cooling is also applicable to a motor with an inner rotor and outer stator structure according to an exemplary embodiment of the present invention, and is not described again.

Fig. 3 is a schematic structural diagram of a wind turbine generator system according to an embodiment of the present invention, and fig. 4 is an enlarged schematic structural diagram of a region B in fig. 3.

Referring to fig. 3 and fig. 4, an embodiment of the present invention further provides a wind turbine generator system, including: the motor 1, the impeller 2 and the nacelle 3 as described above. The power of the wind generating set can be megawatt level, and the motor 1 can be a permanent magnet outer rotor synchronous generator.

The motor 1 has a windward side and a leeward side opposite to each other along both ends of the motor 1 in the axial direction, and the first air inlet 13a of the motor 1 is located on the windward side.

The impeller 2 is located windward side of the motor 1 and is coaxially arranged with the motor 1, and the impeller 2 drives the motor 1 to rotate.

The nacelle 3 is located on the leeward side of the motor 1, the nacelle 3 is provided with a vent 32 and an air duct 31, one end of the air duct 31 is communicated with the first air outlet 141a of the motor 1, and the other end is communicated with the vent 32.

The embodiment of the utility model provides a pair of wind generating set adopts as before motor 1 generate electricity, except that the kinetic energy of catching wind in order to turn into the electric energy, the heat that can also fully excavate the wind transports the latent energy. Through the structure of the motor 1 body structure and the engine room 3, a passive air cooling channel can be constructed by using external air flow as a cooling medium, so that the motor 1 is cooled. Because no independent cooling equipment specially used for cooling the motor 1 is arranged, the self power consumption of the generator set is reduced, the number of parts of the whole wind generating set is small, the cost and the load of the whole generator set are reduced, the cost is low, and the reliability and the maintainability of the wind generating set are improved.

Further, the impeller 2 includes a hub 21, blades 22 provided on the hub 21, and a nacelle 23 provided on an outer peripheral side of the hub 21, and air-permeable seals 4 are provided between the nacelle 23 and the rotor frame 13 of the motor 1 and between the nacelle 23 and the blades 22, respectively.

The air guide sleeve 23 has an annular thin-wall structure, and the structure of the air guide sleeve is in an aerodynamic streamline shape, so that the air guide sleeve can guide the flow direction of outside incoming air. Ventilative sealing member 4 can remove dust, sand prevention, protection such as rain-proof water to external incoming flow air, and the problem that the protection level that exists is low when effectively having avoided current wind generating set's motor to adopt passive air cooling mode, the failure rate is high that the inside influence because of adverse circumstances stress such as rainwater, smoke and dust of motor leads to is particularly useful for high altitude, dry, microthermal area.

Therefore, the outside incoming air is guided to the connection between the air guide sleeve 23 and the motor 1 and the connection between the air guide sleeve 23 and the blades 22 under the air guide effect of the air guide sleeve 23, and enters the inside of the air guide sleeve 23 through the air permeable sealing piece 4 at the connection, the clean air flow which is subjected to dust removal, sand removal or dehumidification by the air permeable sealing piece 4 enters the inside of the motor 1 through the first air inlet 13a of the motor 1, the heat generated by the motor 1 is taken away, then enters the ventilation channel 31 of the cabin 3 through the first air outlet 141a, and the heat is diffused to the outside environment through the ventilation opening 32, so that the cooling of the motor 1 is completed.

Further, the motor according to the above-described exemplary embodiments may also be applied to various apparatuses in which the motor needs to be provided, and is not limited to a wind turbine generator set.

While the invention 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 invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. An electric machine (1), characterized by comprising:

a stator (11) comprising radial channels (11a) axially spaced apart along itself;

a rotor (12) arranged coaxially with the stator (11), an air gap (A) being formed between the rotor (12) and the stator (11) in a radial direction;

the rotor support (13), the said rotor (12) is fixed on rotating shaft through the said rotor support (13), the said rotor support (13) has the first air intake (13a) along one end of axial;

the stator (11) is fixed on a fixed shaft (15) through the stator support (14), and a bearing (16) is arranged between the rotating shaft and the fixed shaft (15); the stator bracket (14) is in dynamic sealing connection with the rotor bracket (13) to form a first ventilation chamber (A1) and a second ventilation chamber (A2) which are positioned at two axial ends of the motor (1) and communicated with the air gap (A), and the first air inlet (13a) is communicated with the first ventilation chamber (A1); the stator support (14) is further provided with a first cavity (14a) and a second cavity (14b) which are not communicated with each other along the circumferential direction of the stator support, the first cavity (14a) is communicated with the radial channel (11a), and the first cavity (14a) is provided with a first air outlet (141 a); the second chamber (14b) is located radially inside the first chamber (14a), the second chamber (14b) is provided with a second air inlet (142a) and a second air outlet (142b), and the second air outlet (142b) is communicated with the second ventilation chamber (A2);

wherein the first ventilation chamber (A1), the second ventilation chamber (A2), the air gap (A), the radial channel (11a), the first chamber (14a) and the second chamber (14b) form a cooling channel communicating with the external environment through the first air inlet (13a), the second air inlet (142a), the second air outlet (142b) and the first air outlet (141 a).

2. The electrical machine (1) according to claim 1, wherein the rotor support (13) comprises a first annular plate (133) extending along the axial direction and a first rotor end plate (131) and a second rotor end plate (132) arranged at the two axial ends of the first annular plate (133), the first rotor end plate (131) is provided with the first air inlet (13a), and the rotor support (13) is connected with the stator support (14) in a dynamic sealing manner through the second rotor end plate (132);

the rotor comprises a rotor yoke and poles arranged on the rotor yoke, the rotor yoke being located on the side of the first annular plate (133) facing the stator (11).

3. The electrical machine (1) according to claim 2, characterized in that said stator support (14) comprises a radially extending support plate (143), a first support plate (141) and a second support plate (142) connected to said support plate (143), said first support plate (141) and said stator (11) forming said first chamber (14a) therebetween; the second yoke plate (142) is located radially inward of the first yoke plate (141), and the second yoke plate (142), the first yoke plate (141), and the support plate (143) form the second chamber (14 b).

4. The electric machine (1) according to claim 3, wherein the first bracket plate (141) comprises a second annular plate (1413) extending in the axial direction, a first stator end plate (1411) and a second stator end plate (1412) located at both axial ends of the second annular plate (1413) and extending radially outward, and a first connecting plate (1414) connected to the first stator end plate (1411) and extending in an axial direction, a second connecting plate (1415) connected to the second stator end plate (1412) and extending in an axial direction, the second annular plate (1413) is connected with the support plate (143), the first connecting plate (1414) and the second connecting plate (1415) support the two axial ends of the stator (11) respectively, the second annular plate (1413), the first stator end plate (1411), the second stator end plate (1412) and the stator (11) enclose to form the first chamber (14 a).

5. The electrical machine (1) according to claim 4, characterized in that a passage communicating with the first ventilation chamber (A1) is formed between the first connection plate (1414) and the first rotor end plate (131).

6. The electric machine (1) according to claim 4, characterized in that the second connection plate (1415) is in dynamic sealing connection with the second rotor end plate (132), and the second housing plate (142), the support plate (143) and the first housing plate (141) form the second chamber (14b) on the side facing the second connection plate (1415).

7. The electric machine (1) according to claim 4, characterized in that said second air intake (142a) communicating with said second chamber (14b) is provided on said supporting plate (143), and said second air outlet (142b) communicating with said second ventilation chamber (A2) is provided on said second connecting plate (1415).

8. The electrical machine (1) according to any of claims 4 to 7, wherein the number of the first chambers (14a) is plural, and the plural first chambers (14a) are distributed at intervals along the circumferential direction of the stator support (14) and are communicated with each other, wherein the second annular plate (1413) of at least one first chamber (14a) is provided with the first air outlet (141a), and the radially inner sides of the rest of the first chambers (14a) are provided with the second chambers (14 b).

9. A wind turbine generator set, comprising:

the electric machine (1) according to any one of claims 1 to 8, wherein the electric machine (1) has opposite windward and leeward sides at two ends along the axial direction of the electric machine (1), and the first air inlet (13a) of the electric machine (1) is positioned at the windward side;

the impeller (2) is positioned on the windward side of the motor (1) and is coaxially arranged with the motor (1), and the impeller (2) drives the motor (1) to rotate; and

cabin (3), be located motor (1) the leeward side, be provided with vent (32) and ventiduct (31) in cabin (3), the one end of ventiduct (31) with first air outlet (141a) the intercommunication of motor (1), the other end with vent (32) intercommunication.

10. Wind park according to claim 9, wherein the impeller (2) comprises a hub (21), blades (22) arranged on the hub (21) and a nacelle (23) arranged on the outer circumference of the hub (21), wherein air-permeable seals (4) are arranged between the nacelle (23) and the rotor support (13) of the electrical machine (1) and between the nacelle (23) and the blades (22), respectively.