CN218514263U - Permanent magnet generator and semi-direct-drive permanent magnet synchronous wind generating set - Google Patents

Abstract

The present application provides a permanent magnet generator and a semi-direct drive permanent magnet synchronous wind power generator set. The permanent magnet generator includes a casing, a stator and a rotor arranged in the casing. The stator includes a stator core and a winding installed on the stator core, and the rotor includes a rotor support frame and a magnetic pole module installed on the rotor support frame. A first partition plate and a second partition plate are also provided in the casing, and the rotor support frame is respectively rotatably connected with the first partition plate and the second partition plate to separate the permanent magnet generator into a first space and a second space. Two spaces, the first space is a closed space isolated from the outside world, and the second space is an open space connected to the outside world, in which the stator core, windings and magnetic pole modules are located in the first space, which can greatly eliminate wind The effect of friction on the temperature of generator windings and permanent magnets.

Description

Permanent magnet generator and semi-direct drive permanent magnet synchronous wind turbine

technical field

The present application relates to the technical field of generators, in particular to a permanent magnet generator and a semi-direct drive permanent magnet synchronous wind power generator set.

Background technique

The semi-direct drive permanent magnet synchronous wind turbine is a transmission chain system composed of a low transmission ratio gearbox and a medium-speed permanent magnet generator, which solves the large size, high cost, and The problem of difficult transportation and the low reliability and high operation and maintenance cost of gearboxes with high transmission ratios. The semi-direct drive permanent magnet synchronous wind turbine has gradually become the development trend of the wind power market in recent years by virtue of its obvious advantages in size, cost and reliability.

In order to improve the strength, the rotor bracket of the semi-direct drive generator is usually evenly distributed with reinforcing ribs one by one in the circumferential direction. The speed of the semi-direct drive generator is relatively high, usually up to 600r/min (rev/min). At a higher speed, the ribs will cause violent agitation of the air inside the generator. Since the air is a viscous fluid, the higher speed will cause the rotor to generate wind friction due to the action of viscous force during the rotation process. For a generator with a speed of 600r/min, the wind friction energy can reach as high as 30-40kW (kilowatt). This part of the heat will increase the temperature of the cooling air of the generator, which will have an adverse effect on the heat dissipation of the generator, and will also increase the temperature difference between the driving end and the non-driving end of the winding. In addition, wind friction will increase with the increase of cooling air flow and rotor speed. Therefore, reducing wind friction is also an important direction to reduce the temperature rise of the generator.

Utility model content

The purpose of this application is to provide a permanent magnet generator and a semi-direct drive permanent magnet synchronous wind power generator set, which can largely eliminate the influence of wind friction on the temperature of the generator windings and permanent magnets.

One aspect of the present application provides a permanent magnet generator. The permanent magnet generator includes a casing and a stator and a rotor arranged in the casing. The stator includes a stator core and a winding installed on the stator core, and the rotor includes a rotor support frame and a magnetic pole module installed on the rotor support frame. A first partition board and a second partition board are also arranged in the casing, and the rotor support frame is respectively rotatably connected with the first partition board and the second partition board so that the permanent The magneto generator is divided into a first space and a second space, the first space is a closed space isolated from the outside world, and the second space is an open space connected to the outside world, wherein the stator core, the winding And the magnetic pole module is located in the first space.

Further, the permanent magnet generator also includes a driving end cover and a non-driving end cover, the casing is arranged between the driving end cover and the non-driving end cover, and the first branch The partition is arranged on the end cover of the driving end, and the second partition is arranged on the end cover of the non-driving end.

Further, the permanent magnet generator further includes a cooling device to cool the gas environment in the first space.

Further, an air inlet and an air outlet are respectively provided on the casing, and there is an air gap between the stator and the rotor, wherein, all air gaps between the air inlet, the stator and the rotor An air circulation path is formed between the air gap and the air outlet.

Further, both the first partition plate and the second partition plate are cylindrical.

Further, the rotor support frame includes an annular base plate for installing the magnetic pole module, the annular base plate includes opposite first and second circumferential sides, and the first circumferential side and the second circumferential side of the annular base plate are The second peripheral side is rotatably connected to the first partition plate and the second partition plate respectively.

Further, the connection between the first partition plate and the first peripheral side of the annular substrate, and the connection between the second partition plate and the second peripheral side of the annular substrate The joint of the joint is a labyrinth seal; or, the joint between the first partition plate and the first peripheral side of the annular base plate, and the joint between the second partition plate and the annular base plate The connection between the second peripheral sides is brush-sealed.

Further, the first partition plate and the second partition plate integrally extend from the driving end cover and the non-driving end cover respectively; or, the first partition plate and the The second partition plate is seamlessly connected with the end cover of the driving end and the end cover of the non-driving end respectively.

Further, the rotor support frame is wheel-shaped, and a plurality of reinforcing ribs are evenly spaced on the rotor support frame.

Further, a plurality of ventilation openings are provided on the rotor support frame, and each of the ventilation openings is located between two adjacent rib plates.

In the permanent magnet generator of the embodiment of the present application, a first partition plate and a second partition plate are respectively arranged in the casing, and the first partition plate and the second partition plate can be rotatably matched with the rotor support frame, thereby The internal space of the generator is divided into a closed first space and an open second space. Important components such as the stator core, windings and pole modules are located in the closed first space, while other components are arranged in the open second space. The second space, therefore, can overcome the deficiencies of the prior art and largely eliminate the influence of wind friction on the temperature of the generator windings and permanent magnets.

Another aspect of the present application also provides a semi-direct drive permanent magnet synchronous wind power generator set. The semi-direct drive permanent magnet synchronous wind power generator set includes a wind rotor, the above-mentioned permanent magnet generator, and a speed increasing box arranged between the wind rotor and the permanent magnet generator.

Description of drawings

Fig. 1 is the sectional schematic diagram of the permanent magnet generator of an embodiment of the present application;

Fig. 2 is an enlarged view of the circle part shown in Fig. 1;

Fig. 3 is a three-dimensional schematic diagram of a rotor support frame according to an embodiment of the present application;

Fig. 4 is a front view of the rotor support frame shown in Fig. 3;

Fig. 5 is a schematic diagram of fluid circulation paths in the first space and the second space of the permanent magnet generator according to an embodiment of the present application.

Detailed ways

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, the same numerals in different drawings refer to 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 means consistent with aspects of the present application as recited in the appended claims.

The terminology used in this application is for the purpose of describing particular embodiments only, and is not intended to limit the application. Unless otherwise defined, the technical terms or scientific terms used in the application shall have the ordinary meanings understood by those skilled in the art to which the application belongs. "First", "second" and similar words used in the specification and claims of this application do not indicate any sequence, quantity or importance, but are only used to distinguish different components. Likewise, words like "a" or "one" do not denote a limitation in quantity, but indicate that there is at least one. "Multiple" or "several" means two or more. Unless otherwise indicated, terms such as "front", "rear", "lower" and/or "upper" are used for convenience of description only and are not intended to be limiting to a position or orientation in space. "Includes" or "comprises" and similar terms mean that the elements or items listed before "comprises" or "comprises" include the elements or items listed after "comprises" or "comprises" and their equivalents, and do not exclude other elements or objects. Words such as "connected" or "connected" are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "the" and "the" are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

An embodiment of the present application provides a permanent magnet generator 100 . Fig. 1 discloses a schematic cross-sectional view of a permanent magnet generator 100 according to an embodiment of the present application. As shown in FIG. 1 , a permanent magnet generator 100 according to an embodiment of the present application includes a casing 30 and a stator and a rotor disposed in the casing 30 . The stator includes a stator core 41 and a winding 42 mounted on the stator core 41 , and the stator is fixed in the housing 30 . The rotor is fixed on the rotating shaft (not shown) and can rotate together with the rotating shaft. The rotor includes a rotor support frame 51 and a magnetic pole module 52 mounted on the rotor support frame 51 .

A first partition board 11 and a second partition board 21 are also arranged inside the casing. The rotor supporting frame 51 is rotatably connected to the first partition plate 11 and the second partition plate 21 respectively, so as to divide the permanent magnet generator 100 into a first space 104 and a second space 105 . The first space 104 is a closed space isolated from the outside world, and the second space 105 is an open space connected to the outside world. Wherein, the stator core 41 , the winding 42 and the magnetic pole module 52 are located in the closed first space 104 .

The permanent magnet generator 100 of the embodiment of the present application is provided with the first partition plate 11 and the second partition plate 21 respectively in the casing 30, and the first partition plate 11 and the second partition plate 21 can be connected with the rotor support frame. 51 can be rotatably matched to separate the inner space of the generator into a closed first space 104 and an open second space 105, and important components such as the stator core 41, winding 42 and magnetic pole module 52 are located in the closed first space. In the space 104, other components are arranged in the open second space 105, so that the shortcomings of the prior art can be overcome, and the influence of wind friction on the temperature of the generator winding 42 and the permanent magnet can be largely eliminated.

The permanent magnet generator 100 in an embodiment of the present application further includes a driving end cover 10 and a non-driving end cover 20 . The casing 30 is arranged between the end cover 10 of the driving end and the end cover 20 of the non-driving end, the first partition plate 11 is arranged on the end cover 10 of the driving end, and the second partition plate 21 is arranged on the end cover 20 of the non-driving end .

In some embodiments, both the first partition plate 11 and the second partition plate 21 are cylindrical. In some embodiments, the first partition plate 11 integrally extends from the inner surface of the driving end cover 10 , and the second partition plate 21 integrally extends from the inner surface of the non-driving end cover 20 . In some other embodiments, the first partition plate 11 can be seamlessly connected with the driving end cover 10 , and the second partition plate 21 is seamlessly connected with the non-driving end cover 20 .

Fig. 3 and Fig. 4 disclose the illustration of the rotor support frame 51 of an embodiment of the present application, wherein, Fig. 3 discloses the three-dimensional schematic view of the rotor support frame 51; Fig. 4 discloses the front view of the rotor support frame 51 shown in Fig. 3 picture. As shown in FIG. 3 and FIG. 4 , the rotor support frame 51 includes an annular support plate 511 and an annular base plate 512 for installing the magnetic pole module 52 . The annular base plate 512 is cylindrical, and the magnetic pole module 52 is installed on the outer cylindrical surface of the annular base plate 512 . The annular base plate 512 is sheathed and welded to the outer circumference of the annular support plate 511 , and the rotating shaft is welded to the inner circumference of the annular support plate 511 . The cylindrical annular substrate 512 includes opposite first peripheral sides 5121 and second peripheral sides 5122, the first peripheral side 5121 and the second peripheral side 5122 of the annular substrate 512 are respectively separated from the first partition plate 11 and the second partition plate 11. The plates 21 are rotatably connected.

FIG. 2 reveals an enlarged view of the circled portion shown in FIG. 1 . As shown in FIG. 2 , in some embodiments, the connection between the first partition plate 11 and the first peripheral side 5121 of the annular substrate 512 and the second peripheral side of the second partition plate 21 and the annular substrate 512 The connection between 5122 can be a labyrinth seal. In some other embodiments, the connection between the first partition plate 11 and the first peripheral side 5121 of the annular substrate 512 and the connection between the second partition plate 21 and the second peripheral side 5122 of the annular substrate 512 The place can be sealed with a brush. The labyrinth seal or the brush seal can prevent foreign impurities from invading the closed first space 104 and corroding important components such as the generator winding 42 and the magnetic pole module 52 .

In some embodiments, the rotor support frame 51 is wheel-shaped, and a plurality of reinforcing ribs 513 are evenly spaced on the rotor support frame 51 . A plurality of reinforcing ribs 513 are located on opposite sides of the annular supporting plate 511, and the reinforcing ribs 513 are perpendicular to the annular supporting plate 511, thereby ensuring the strength of the rotor.

In some embodiments, a plurality of ventilation holes 514 are opened on the annular support plate 511 of the rotor support frame 51 , and each ventilation hole 514 is located between two adjacent rib plates 513 .

Fig. 5 discloses a schematic diagram of the fluid circulation paths of the first space 104 and the second space 105 of the permanent magnet generator 100 according to an embodiment of the present application. As shown in Figure 5, the permanent magnet generator 100 of the embodiment of the present application adopts the form of water cooling of the casing 30 combined with forced ventilation. The permanent magnet generator 100 of the embodiment of the present application may also include cooling equipment, such as an air-to-water cooler 70, It can be used to cool the gas environment in the first space 104 . A cooling water channel (not shown) is provided on the casing 30 , and forced ventilation is used inside the permanent magnet generator 100 . An air inlet 101 and an air outlet 102 are respectively provided on the casing 30, and there is an air gap 103 between the stator and the rotor, wherein, as shown by the solid arrow in FIG. An air circulation path is formed between the gap 103 and the air outlet 102 . The air circulation path is located in the closed first space 104, forming a closed cycle. In this closed cycle, the cooling air from the air-water cooler 70 flows in from the air inlet 101 at the drive end of the permanent magnet generator 100, passes through the air gap 103 between the stator and the rotor, flows out from the air outlet 102 at the non-drive end, and enters To the air-water cooler 70, after the temperature of the air-water cooler 70 drops, it enters the air inlet 101 of the driving end of the generator again, thereby taking away the heat of the stator and rotor.

After the internal space of the permanent magnet generator 100 of the embodiment of the present application is divided, the shape and structure of the closed first space 104 can be more regular, and the air circulation path is simpler, which is beneficial to reduce the pressure drop of the air in the circulation.

The open second space 105 is directly connected with the external environment, and the ambient air can freely pass through the ventilation holes 514 on the annular support plate 511 of the rotor support frame 51, thereby taking away the wind friction generated by the high-speed rotating rib plate 513.

In the permanent magnet generator 100 of the embodiment of the present application, through the separation of the cylindrical first partition plate 11 and the second partition plate 21 of the driving end cover 10 and the non-driving end cover 20, the rotor can be The wind friction caused by the support frame 51 and the rib plate 513 is only distributed in the open second space 105, and can be directly dissipated into the external environment, and will not enter the closed first space 104 to cause cooling air temperature in the closed cycle. The rise is more conducive to the heat dissipation of the generator.

Another embodiment of the present application also provides a semi-direct drive permanent magnet synchronous wind power generator set. The semi-direct drive permanent magnet synchronous wind power generator set includes a wind rotor, the above-mentioned permanent magnet generator 100 , and a speed reduction box arranged between the wind rotor and the permanent magnet generator 100 .

The permanent magnet generator 100 of the embodiment of the present application and the semi-direct drive permanent magnet synchronous wind power generator set with the permanent magnet generator 100 can overcome the deficiencies of the prior art, and greatly eliminate the impact of wind friction on the generator winding 42 and the permanent magnet generator. Influence of magnet temperature. At the same time, the air path can be optimized to reduce the pressure drop of the air in the circuit, which is more conducive to the selection of the cooling fan.

The above is only a preferred embodiment of the application, and is not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application should be included in the application. within the scope of protection.

Claims (11)

1. A permanent magnet generator, characterized by: including the casing and set up in stator and rotor in the casing, the stator includes stator core and installs winding on the stator core, the rotor includes the rotor support frame and install in magnetic pole module on the rotor support frame, still be provided with first division board and second division board in the casing, the rotor support frame respectively with first division board reaches second division board rotatable coupling, in order with permanent magnet generator separates into first space and second space, the enclosure space of first space for keeping apart with the external world, the second space is the open space with external intercommunication, wherein, stator core the winding reaches the magnetic pole module is located in the first space.

2. The permanent magnet generator of claim 1 wherein: the drive end cover is arranged on the shell, the non-drive end cover is arranged on the shell, the first partition plate is arranged on the drive end cover, and the second partition plate is arranged on the non-drive end cover.

3. The permanent magnet generator of claim 1 wherein: further comprising cooling means to cool the gaseous environment within said first space.

4. The permanent magnet generator of claim 2 wherein: an air inlet and an air outlet are respectively arranged on the shell, an air gap is arranged between the stator and the rotor, and an air circulation passage is formed among the air inlet, the air gap between the stator and the rotor and the air outlet.

5. The permanent magnet generator of claim 2 wherein: the first partition plate and the second partition plate are both cylindrical.

6. The permanent magnet generator of claim 5 wherein: the rotor supporting frame comprises an annular base plate used for installing the magnetic pole module, the annular base plate comprises a first peripheral side and a second peripheral side which are oppositely arranged, and the first peripheral side and the second peripheral side of the annular base plate are respectively connected with the first partition plate and the second partition plate in a rotatable mode.

7. The permanent magnet generator of claim 6 wherein: a junction between the first partition plate and the first peripheral side of the annular base plate, and a junction between the second partition plate and the second peripheral side of the annular base plate are labyrinth seals; or,

the joint between the first partition plate and the first peripheral side of the annular base plate and the joint between the second partition plate and the second peripheral side of the annular base plate are sealed with brushes.

8. The permanent magnet generator of claim 2 wherein: the first partition plate and the second partition plate respectively extend integrally from the drive-end cap and the non-drive-end cap; or,

the first partition plate and the second partition plate are respectively connected with the driving end cover and the non-driving end cover in a seamless mode.

9. The permanent magnet generator of claim 6 wherein: the rotor support frame is in a wheel shape, and a plurality of reinforcing rib plates are uniformly arranged on the rotor support frame at intervals.

10. The permanent magnet generator of claim 9 wherein: and a plurality of ventilation openings are formed in the rotor support frame, and each ventilation opening is positioned between two adjacent reinforcing rib plates.

11. A semi-direct-drive permanent magnet synchronous wind generating set is characterized in that: comprising a wind wheel, a permanent magnet generator according to any of claims 1-10, and a gearbox arranged between the wind wheel and the permanent magnet generator.

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