Heat sink, rotor assembly, electric machine and wind turbine generator set

Abstract

The utility model discloses a heat dissipation device, rotor subassembly, motor and wind generating set for installing in the axial end part of the rotor of motor, and heat dissipation device includes first support plate and a plurality of turbulence piece, still be equipped with a plurality of first ventilation hole on the first support plate, and turbulence piece sets up in the first support plate and interval distribution in the circumferential direction of rotor, when heat dissipation device rotates along with rotor, and turbulence piece can disturb external airflow and form cooling airflow, and cooling airflow flows from the first ventilation hole axially, and changes the flow direction of airflow, makes at least part airflow from a plurality of turbulence piece between high -speed flow along the radial direction of rotor, and blows to the end part winding, accelerates the heat dissipation of end part winding, enhances the heat exchange efficiency, reduces the temperature difference between end part winding and other parts of winding, improves the service life of motor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a heat dissipation device, rotor assembly, motor and wind turbine generator set. Background Technology

[0002] As motor design moves towards higher speeds and miniaturization, the size of the motor can be significantly reduced by increasing the speed and decreasing the number of coils, while keeping the theoretical power of the motor essentially unchanged. Taking a 10MW motor as an example, if the speed is increased from 600 r / min to 1800 r / min, the number of stator slots decreases from 200 to 100. At the same efficiency (e.g., 98%), the loss is 200kW. The surface heat density of the 100-slot motor increases significantly, exacerbating internal heat dissipation problems. This heat dissipation problem is particularly concentrated in the end windings of the motor.

[0003] Traditional motor cooling methods primarily employ external air-cooling or liquid-cooling systems, removing heat through forced convection or fluid circulation. However, these methods mainly focus on cooling the casing surface, the core, or the windings as a whole, but are less effective at cooling the axially protruding end windings, leading to significant temperature differences between these end windings and other areas of the winding. Furthermore, as motor power density increases, the heat accumulation effect in the end windings becomes increasingly pronounced. Therefore, there is an urgent need for a device that can specifically reduce the excessively high temperature of the end windings. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a heat dissipation device, rotor assembly, motor and wind turbine generator set to solve the problem of excessively high end winding temperature of the motor.

[0005] On one hand, according to an embodiment of the present invention, a heat dissipation device is proposed for installation on the axial end of the rotor of a motor, comprising: a first support plate and a plurality of baffles, wherein the first support plate is provided with a plurality of first ventilation holes, and the plurality of baffles are disposed on the first support plate and spaced apart in the circumferential direction of the rotor. When the heat dissipation device rotates with the rotor, the baffles enable at least a portion of the external airflow that flows into the rotor axially through the first ventilation holes to flow radially along the rotor.

[0006] According to one aspect of the present invention, the heat dissipation device further includes a second support plate, the second support plate and the first support plate being spaced apart in the axial direction of the rotor, and a baffle being disposed between the first support plate and the second support plate.

[0007] According to one aspect of the present invention, a second support plate is provided with a plurality of second ventilation holes, which allow airflow to flow into or out of the rotor core of the rotor, and / or, a first ventilation hole allows airflow to flow into or out of the rotor core of the rotor.

[0008] According to one aspect of the present invention, at least a portion of a plurality of second ventilation holes are aligned with at least a portion of a plurality of first ventilation holes in the axial direction of the rotor.

[0009] According to one aspect of the present invention, the baffle is sheet-shaped and extends radially along the first support plate.

[0010] According to one aspect of the present invention, the heat dissipation device further includes a bushing for being sleeved on the rotating shaft of the motor, a first support plate being annular, the radial inner edge of the first support plate being fixedly connected to the bushing, and / or a second support plate being annular, the radial inner edge of the second support plate being fixedly connected to the bushing, and / or a baffle being fixedly connected to the bushing.

[0011] According to one aspect of the present invention, the heat dissipation device further includes a bushing, the first support plate and the second support plate are annular, the radial inner edge of the second support plate is spaced apart from the outer peripheral surface of the bushing by a predetermined distance, and the projection of the second support plate onto the first support plate along the axial direction is located in the outer peripheral region of the first support plate. According to one aspect of the present invention, the first support plate and / or the second support plate are provided with a connecting portion for fixed connection with the rotor.

[0012] On the other hand, according to an embodiment of the present invention, a rotor assembly is provided, the rotor assembly including a rotor and the above-mentioned heat dissipation device, the heat dissipation device being disposed at at least one of the two axial ends of the rotor.

[0013] According to one aspect of the present invention, the rotor assembly further includes a rotating shaft, and a heat dissipation device is fixedly connected to the rotating shaft and / or the rotor.

[0014] According to one aspect of the present invention, the rotor includes an axial ventilation channel disposed along the axial direction of the rotor assembly, wherein at least a portion of the airflow is capable of flowing in the axial ventilation.

[0015] According to one aspect of the present invention, the heat dissipation device further includes a second support plate, and the second support plate is provided with a plurality of second ventilation holes. In the axial direction of the rotor, the first ventilation hole is at least partially aligned with the axial ventilation channel, and / or, the second ventilation hole is at least partially aligned with the axial ventilation channel, and / or, the first ventilation hole is at least partially aligned with the second ventilation hole.

[0016] In another aspect, an electric motor is proposed according to an embodiment of the present invention, the electric motor including a stator assembly and the aforementioned rotor assembly.

[0017] According to one aspect of the present invention, a stator assembly is sleeved on the outer periphery of a rotor. The stator assembly includes a stator core and a stator winding. The end of the stator winding protrudes relative to the axial end of the rotor core and surrounds the outer periphery of a heat dissipation device.

[0018] In another aspect, according to an embodiment of the present invention, a wind turbine generator set is provided, including the aforementioned motor.

[0019] According to the embodiments of the present invention, a heat dissipation device, rotor assembly, motor, and wind turbine generator set are provided. The heat dissipation device, installed at the axial end of the motor rotor, includes a first support plate and multiple baffles. The first support plate also has multiple first ventilation holes. When the heat dissipation device rotates with the rotor, the baffles can disturb the external airflow to form a cooling airflow. The cooling airflow flows axially into the rotor through the first ventilation holes and changes the flow direction, causing at least a portion of the airflow to flow out at high speed along the radial direction of the rotor from between the multiple baffles, blowing towards the end winding. This accelerates the heat dissipation of the end winding, enhances heat exchange efficiency, reduces the temperature difference between the end winding and other parts of the winding, and improves the service life of the motor. Attached Figure Description

[0020] The above and other aspects, features, and other advantages of the present invention will become clearer and more readily understood from the following detailed description of exemplary embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of the structure of a heat dissipation device according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a rotor assembly in this application; Figure 3 This is a schematic diagram of the structure of a heat dissipation device according to another embodiment of this application; Figure 4 This is a schematic diagram of another rotor assembly in this application; Figure 5 This is a schematic diagram of the rotor structure in this application; Figure 6 This is a schematic diagram of the structure of the motor in this application; Figure 7 This is a cross-sectional view of the motor in this application; Figure 8 This is a heat dissipation airflow path diagram of the motor in this application; Figure 9 This is another heat dissipation airflow path diagram for the motor in this application.

[0021] Symbol explanation: 10. Heat dissipation device; 11. First support plate; 12. Second support plate; 121. Connecting hole; 122. Bolt; 13. Baffle; 141. First ventilation hole; 142. Second ventilation hole; 15. Bushing; 20. Rotor; 21. Rotor core; 22. Pressure plate; 23. Axial ventilation duct; 30. Shaft; 40. Stator assembly; 41. Stator core; 42. Stator winding; 421. End winding. Detailed Implementation

[0022] The following detailed descriptions are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be altered as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0023] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, apparatus and / or systems described herein, many of which will become clear upon understanding the disclosure of this utility model.

[0024] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more.

[0025] Although terms such as “first” and “second” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Thus, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0026] In the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to," or "mounted to" another element, the element may be directly "on" another element, directly "connected to," or "mounted to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly mounted to" another element, no other elements may be present in between.

[0027] The terminology used herein is for describing various examples only and is not intended to limit the invention. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. The term “a plurality” represents any quantity of two or more.

[0028] The directional terms "upper," "lower," "inner," and "outer" used in this utility model are all based on the reference position of the household appliance in its normal use state. This definition method will help ensure that readers or users can clearly understand the relative positional relationships of the various components and functions, and should not be construed as a limitation of this utility model.

[0029] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains after understanding the invention. Unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this invention, and shall not be interpreted in an idealized or overly formalistic manner.

[0030] Furthermore, in the description of the examples, detailed descriptions of well-known related components or functions will be omitted when it is believed that such detailed descriptions would lead to a vague interpretation of the present invention.

[0031] The significant temperature difference between the end winding 421 and other parts of the winding can lead to accelerated aging of the insulation material of the end winding 421, decreased electromagnetic performance, and even equipment failure, thus reducing the service life of the motor. Therefore, to reduce the problem of excessively high temperature in the end winding 421, this application provides a heat dissipation device 10 capable of targeted heat dissipation of the end winding 421.

[0032] Figure 1 This is a schematic diagram of the structure of the heat dissipation device 10 according to the first embodiment of this application.

[0033] Reference Figure 1 According to a first embodiment of this application, a heat dissipation device 10 is installed at the axial end of a rotor 20 of a motor. It includes a first support plate 11 and several baffles 13. Multiple baffles 13 are disposed on the first support plate 11 and spaced apart in the circumferential direction of the rotor 20, thereby forming ventilation gaps between adjacent baffles 13. The first support plate 11 has multiple first ventilation holes 141, which communicate with the ventilation gaps between the first ventilation holes 141 and the baffles 13. When the heat dissipation device 10 is installed on the rotor 20, the first support plate 11 can face outwards from the rotor 20, allowing the heat dissipation device 10 to rotate with the rotor 20. The baffles 13 allow external airflow to enter the heat dissipation device 10 axially through the first ventilation holes 141. At least a portion of the airflow entering the heat dissipation device 10 can flow outwards radially from the rotor 20 through the ventilation gaps between the baffles 13.

[0034] According to an embodiment of this application, the heat dissipation device 10 may further include a second support plate 12, which is spaced apart from the first support plate 11 in the axial direction of the rotor 20, and a plurality of baffles 13 are disposed between the first support plate 11 and the second support plate 12. By providing the second support plate 12, the structural strength of the heat dissipation device 10 can be enhanced.

[0035] Both the second support plate 12 and the first support plate 11 are annular, with a through hole in the middle to avoid the rotating shaft 30. The second support plate 12 and the first support plate 11 are axially spaced apart by a predetermined distance, and a plurality of airflow deflectors 13 are circumferentially spaced apart, with both ends of each airflow deflector 13 fixedly connected to the second support plate 12 and the first support plate 11, for example, by welding, to form fan blades of a heat dissipation structure, which force airflow to flow radially during rotation.

[0036] The heat dissipation device 10 according to this embodiment can be applied to a motor with an outer stator and an inner rotor. Specifically, the heat dissipation device 10 can be installed at the axial end of the rotor 20, thereby being located radially inner to the end winding 421. When the heat dissipation device 10 rotates with the rotor 20, the baffle 13 can agitate the airflow, causing at least a portion of the airflow to flow radially outward under the action of centrifugal force and be delivered to the end winding 421. Since the airflow flows radially outward from the middle of the heat dissipation device 10, the pressure in the middle of the heat dissipation device 10 is relatively low. Under the action of the pressure difference, the external airflow continuously flows in from the first ventilation hole 141, forming a continuous cooling airflow. The airflow changes from axial intake to radial high-speed outflow and blows directly onto the end winding 421, thereby effectively cooling the end winding 421, significantly reducing its temperature, reducing the winding temperature difference, and extending the service life of the motor.

[0037] According to embodiments of this application, when the heat dissipation device 10 is mounted on the rotor 20, one of the first support plate 11 and the second support plate 12 can be positioned towards the axial end of the rotor 20, while the other is positioned away from the axial end of the rotor 20. As an example, such as... Figure 2 As shown, the second support plate 12 faces the axial end of the rotor 20, while the first support plate 11 faces away from the axial end of the rotor 20.

[0038] The heat dissipation device 10 is generally circular to conform to the outer contour of the rotor 20, avoiding interference with the end winding 421 during rotation. A through hole is provided in the center of the heat dissipation device 10, allowing the motor shaft 30 to pass through. The heat dissipation device 10 also includes a bushing 15 located in the central region of the first support plate 11 and the second support plate 12, through which the shaft 30 can pass. Furthermore, the inner diameter of the bushing 15 can match the outer diameter of the shaft 30, allowing the heat dissipation device 10 to be coaxially mounted with the shaft 30. This ensures force balance between the heat dissipation device 10 and the shaft 30, allowing the rotational balance of the heat dissipation device 10 to occur simultaneously with the rotor 20, eliminating the need for additional dynamic balancing.

[0039] According to the heat dissipation device 10 of this application embodiment, at least one of the first support plate 11 and the second support plate 12 has its radial inner edge fixedly connected to the bushing 15, forming an integral structure with the bushing 15. The connection method between the second support plate 12 and the first support plate 11 and the bushing 15 can be at least one of welding, bolting 122, and bonding. The connection method between the second support plate 12 and the first support plate 11 and the bushing 15 is not limited to these, as long as a stable connection between the second support plate 12 and the first support plate 11 and the bushing 15 can be achieved.

[0040] exist Figure 1 In the first embodiment shown, the radial inner edge of the first support plate 11 is fixedly connected to the bushing 15 (e.g., welded connection), and the radial inner edge of the second support plate 12 is spaced a predetermined distance from the outer surface of the bushing 15. When the heat dissipation device 10 is connected to the rotor 20, the second support plate 12 faces the axial end of the rotor 20.

[0041] According to embodiments of this application, the rotor 20 also has heat dissipation requirements inside. Therefore, axial ventilation channels 23 and / or radial ventilation channels are provided in the rotor 20, so that at least part of the external airflow can still flow through the interior of the rotor 20, thereby carrying away heat. To allow external airflow to flow through the interior of the rotor 20, in... Figure 1 In the illustrated embodiment, the second support plate 12 is provided with a through hole that allows airflow to further flow into the rotor 20. This through hole can serve as a second ventilation hole 142 provided on the second support plate 12. Figure 1As shown, a through hole is provided in the middle of the second support plate 12. The diameter of the through hole is larger than the outer diameter of the shaft 30 of the rotor 20. This creates a predetermined distance between the radial inner edge of the second support plate 12 and the outer peripheral surface of the bushing 15. Furthermore, the projection of the second support plate 12 onto the first support plate 11 along the axial direction of the rotor 20 is located in the outer peripheral region of the first support plate 11. Therefore, this through hole allows not only the shaft 30 of the rotor 20 to pass through, but also a portion of the external airflow to enter the interior of the rotor 20 axially. In other words, the diameter of the inner edge of the second support plate 12 is larger than the outer diameter of the bushing 15, maintaining a distance between it and the bushing 15, and thus also a distance between it and the outer surface of the shaft 30, thereby forming an axial airflow channel. In the axial direction, the second support plate 12 is opposite to the first support plate 11 in the outer edge region of the first support plate 11.

[0042] With this configuration, as the rotor 20 rotates, a portion of the cooling airflow axially drawn into the heat dissipation device 10 between the first support plate 11 and the second support plate 12 flows out radially outward along the heat dissipation device 10 under the action of the baffle 13, and is blown onto the end winding 421. The other portion of the cooling airflow can be directly blown onto the rotor 20 and enter the interior of the rotor 20. By increasing the inner diameter of the second support plate 12, the resistance to external airflow entering the interior of the rotor 20 can be reduced, and the airflow rate can be increased, thereby rapidly cooling the rotor 20.

[0043] Figure 2 A schematic diagram is shown showing a heat dissipation device 10 installed at the axial end of a rotor 20 according to a first embodiment of this application. Figure 2 As shown, the rotor 20 is mounted on the rotating shaft 30, and the heat dissipation device 10 is disposed at at least one of the two axial ends of the rotor 20.

[0044] The heat dissipation device 10 can be fixedly connected to the rotating shaft 30 via the bushing 15, or it can be fixedly connected to the rotor 20 via the second support plate 12. Both of the above connection methods can also be used simultaneously. Figure 2 An example of a fixed connection between the heat dissipation device 10 and the rotor 20 via the second support plate 12 is shown.

[0045] Optionally, the second support plate 12 is fixedly connected to the rotor 20 by at least one of the following connection methods: bolts 122, riveting, welding, pin connection, key connection, and bonding. The connection method between the second support plate 12 and the rotor 20 is not limited to these methods, as long as a stable connection is achieved.

[0046] As an example, such as Figure 1 and Figure 2 As shown, the second support plate 12 is provided with connecting parts at intervals along the circumferential direction of the rotor 20. For example, the connecting part is a connecting hole 121. The second support plate 12 can be connected to the rotor 20 by means of bolts 122, riveting or pin connection.

[0047] Furthermore, the rotor 20 includes rotor cores 21 stacked on top of each other and a pressure plate 22 for fixing the rotor cores 21. Therefore, the second support plate 12 of the heat dissipation device 10 can be fixedly connected to the pressure plate 22 of the rotor 20 by bolts 122 passing through the connecting hole 121.

[0048] Figure 3 A schematic structure of a heat dissipation device 10 according to a second embodiment of this application is shown. Figure 3 The heat dissipation device 10 and Figure 1 The structure of the heat dissipation device 10 is roughly the same as that of the heat dissipation device 10, Figure 3 As shown, the heat dissipation device 10 includes a first support plate 11, a second support plate 12, and airflow deflectors 13. The second support plate 12 is spaced apart from the first support plate 11 in the axial direction of the rotor 20. Multiple airflow deflectors 13 are disposed between the first support plate 11 and the second support plate 12, and are spaced apart in the circumferential direction of the rotor 20, thereby forming ventilation gaps between adjacent airflow deflectors 13. The first support plate 11 is provided with multiple first ventilation holes 141. The ventilation gaps between the first ventilation holes 141 and the airflow deflectors 13 communicate with each other, allowing external airflow to enter the heat dissipation device 10 axially through the first ventilation holes 141 and flow out radially outward through the ventilation gaps between the airflow deflectors 13.

[0049] and Figure 1 The heat dissipation structure shown is different in that... Figure 3 In the example shown, the bushing 15 is fixedly connected to both the second support plate 12 and the first support plate 11. The second support plate 12 and the first support plate 11 have approximately the same shape and size, and the radially inner sides of both the second support plate 12 and the first support plate 11 extend to the outer periphery of the bushing 15 and are fixedly connected to the bushing 15, for example, by welding. By extending the axial length of the bushing 15 and connecting it to both the second support plate 12 and the first support plate 11, the structural strength of the heat dissipation device 10 can be improved.

[0050] When the radially inner side of the second support plate 12 extends to the outer periphery of the bushing 15 and is fixedly connected to the bushing 15, a plurality of second ventilation holes 142 are provided on the second support plate 12 to allow airflow to enter the interior of the rotor 20 for cooling. At least a portion of the plurality of second ventilation holes 142 are aligned with a plurality of first ventilation holes 141 in the axial direction of the rotor 20, facilitating smooth airflow into the interior of the rotor 20. If airflow into the interior of the rotor 20 is not required, the second support plate 12 can also be closed, meaning that the plurality of second ventilation holes 142 may not be provided on the second support plate 12.

[0051] In addition, with Figure 1 The heat dissipation structure is different in that, Figure 3The baffle 13 can extend further along the radial direction of the first support plate 11, the second support plate 12, or the rotor 20, for example, extending to the bushing 15. It can have a gap with the bushing 15, or it can be connected as an integral structure, for example, by welding. By increasing the length of the baffle 13, the structural strength of the heat dissipation device 10 can be further improved, and the radial airflow can also be further improved.

[0052] In the second embodiment of this application, the heat dissipation device 10 is fixedly connected to the rotating shaft 30 via a bushing 15, thereby connecting the heat dissipation device 10 to the rotor 20. The bushing 15 and the rotating shaft 30 of the rotor 20 can be connected by at least one of interference fit, transition fit, and key fit. Optionally, a flat key, a semi-circular key, a wedge key, and a spline can be used for connection. However, the connection method between the bushing 15 and the rotating shaft 30 is not limited to these, as long as a stable connection between the bushing 15 and the rotating shaft 30 is achieved.

[0053] As an example, the bushing 15 and the shaft 30 are connected by an interference fit. The inner diameter of the bushing 15 is slightly smaller than the outer diameter of the shaft 30, and the tight connection is achieved through the principle of thermal expansion and contraction. During assembly, the bushing 15 is heated to expand it, and the shaft 30 is quickly pressed into the bushing 15. After cooling, an interference fit is formed between the bushing 15 and the shaft 30.

[0054] Although the rotor 20 is fixedly connected to the second support plate 12 in the first embodiment of this application, and the shaft 30 is fixedly connected to the bushing 15 in the second embodiment, the embodiments of this application are not limited to these. Those skilled in the art can use any one or two of the above connection methods according to the connection strength requirements.

[0055] The heat dissipation device 10 can be installed at either end or both ends of the rotor 20 along its axial direction. Figure 4 A schematic diagram is shown showing the heat dissipation device 10 connected to the rotor 20 according to the second embodiment of this application. Figure 4 As shown, the heat dissipation device 10 is installed at both ends of the rotor 20 in the axial direction, thereby simultaneously cooling the end windings 421 at both ends of the axial direction.

[0056] In both the heat dissipation device 10 of the first embodiment and the heat dissipation device 10 of the second embodiment of this application, a plurality of baffles 13 are provided between the first support plate 11 and the second support plate 12, and the plurality of baffles 13 are distributed at intervals along the circumferential direction of the rotor 20. Preferably, adjacent baffles 13 are distributed at equal intervals in the circumferential direction. With this arrangement, when the heat dissipation device 10 rotates with the rotor 20, the heat dissipation device 10 can withstand the reaction of uniform airflow, avoid local stress concentration, reduce mechanical vibration, extend service life, and also make the cooling airflow uniformly distributed, avoiding local overheating or heat dissipation dead zones, which would affect the heat dissipation effect of the end winding 421.

[0057] The spoiler 13 is sheet-like, which can be planar or curved. With the same thickness, planar spoilers 13 generally have better bending and torsional strength, especially at high speeds or under airflow impact, and are less prone to deformation. Furthermore, planar spoilers 13 are simple to manufacture, and can be produced through stamping, laser cutting, or casting, resulting in lower manufacturing costs. However, planar spoilers 13 experience significant impact losses because the airflow direction abruptly changes from axial to radial when entering the blade channel. Airflow within the blade channel is also prone to separation and vortices, leading to substantial friction and vortex losses. In contrast, curved spoilers 13 offer the advantage of high efficiency. The curved profile of the blades smoothly guides the airflow from axial to radial, significantly reducing inlet impact losses. Airflow within the channel is smoother, with less separation, lower friction and vortex losses, and better optimized aerodynamic performance. Curved spoilers 13 can be manufactured through injection molding, precision machining, or 3D printing.

[0058] Depending on the design requirements, either a planar spoiler 13 or a curved spoiler 13 can be selected. Furthermore, depending on the design requirements, multiple spoilers 13 can be combined, with some parts being planar and others being curved.

[0059] The spoiler 13 can extend along the radial direction of the rotor 20, or it can be tilted at a certain angle relative to the radial direction, for example, the angle formed with the radial direction of the rotor 20 is greater than 0 degrees and less than or equal to 75 degrees. The spoiler 13 can be designed to be tilted forward or backward.

[0060] Furthermore, the turbulence-inducing element 13 can also twist along the radial direction of the rotor 20, with a twist angle between 5 and 15 degrees, to further optimize the airflow path. The fluid velocity of the airflow increases with the increase of the cross-sectional height of the turbulence-inducing element 13, and the circumferential velocity component is significantly enhanced, further strengthening the turbulence intensity.

[0061] Furthermore, the length of the spoiler 13 in the radial direction of the second support plate 12 can be less than or equal to the radial width of the second support plate 12. In this case, the two axial ends of the spoiler 13 are fixedly connected to the second support plate 12 and the first support plate 11, respectively, which can provide sufficient support for the spoiler 13, improve its resistance to deformation, and enable it to adapt to high-load working conditions.

[0062] Return to reference Figure 1The first support plate 11 is provided with multiple first ventilation holes 141. This arrangement provides an axial intake channel for airflow and also reduces the weight of the first support plate 11, making the overall heat dissipation device 10 lighter. The first ventilation holes 141 are spaced apart along the circumferential direction of the rotor 20. This arrangement allows airflow to be evenly and dispersedly drawn in axially and evenly discharged radially under centrifugal force, ensuring uniform cooling airflow on the surface of the end winding 421 and preventing localized overheating. Furthermore, the even circumferential distribution of the first ventilation holes 141 helps balance the load on the heat dissipation device 10 and the rotor 20 during rotation, reducing vibration caused by uneven mass distribution and extending the service life of the heat dissipation device 10.

[0063] Furthermore, the shape of the first ventilation hole 141 can be circular, elliptical, fan-shaped, rectangular, or other irregular shapes. The specific shape of the first ventilation hole 141 is not limited to these, as long as it allows airflow to pass through.

[0064] Reference Figure 5 The rotor 20 is also provided with an axial ventilation channel 23, which is located inside the rotor 20 and extends through the rotor 20 in the axial direction, providing a flow path for cooling airflow. When the heat dissipation device 10 is installed on the rotor 20, the first ventilation hole 141 provided on the first support plate 11 is at least partially aligned with the axial ventilation channel 23 of the rotor 20 in the axial direction of the rotor. When the heat dissipation device 10 rotates with the rotor 20, at least a portion of the airflow drawn in axially through the first ventilation hole 141 can smoothly enter the axial ventilation channel 23 inside the rotor 20 to dissipate heat from the inside of the rotor 20.

[0065] Return to reference Figure 3 According to the second embodiment of this application, the second support plate 12 of the heat dissipation device 10 is further provided with a plurality of second ventilation holes 142, which have a general shape and size to the first ventilation holes 141. When the heat dissipation device 10 is mounted on the rotor 20, the first ventilation hole 141 of the first support plate 11, the second ventilation hole 142 of the second support plate 12, and the axial ventilation channel 23 of the rotor 20 are aligned at least partially in the axial direction of the rotor 20. When the heat dissipation device 10 rotates with the rotor 20, at least a portion of the airflow drawn in axially through the first ventilation hole 141 can flow smoothly through the second ventilation hole 142 and enter the axial ventilation channel 23 inside the rotor 20 to dissipate heat from the inside of the rotor 20.

[0066] The alignment area of ​​the first ventilation hole 141 and the axial ventilation channel 23, or the first ventilation hole 141, the second ventilation hole 142 and the axial ventilation channel 23 in the axial direction of the rotor 20, can be adjusted according to design requirements to adjust the airflow distribution ratio.

[0067] According to an embodiment of this application, a rotor assembly is provided, which includes a rotor 20, a shaft 30, and a heat dissipation device 10 as described above. The rotor 20 is mounted on the shaft 30, and the heat dissipation device 10 can be mounted on one axial end or both axial ends of the rotor 20. Figure 2 and Figure 4 A rotor assembly according to an embodiment of this application is shown. Figure 2 and Figure 4 The rotor assembly shown has heat dissipation devices 10 installed at both ends of the rotor 20 to ensure that the end windings 421 at both axial ends are cooled accordingly. When the heat dissipation devices 10 are installed on the rotor 20, one of the first support plate 11 and the second support plate 12 can face the axial end of the rotor 20. With heat dissipation devices 10 installed at both axial ends of the rotor 20, the two heat dissipation devices 10 can be installed in the same direction or back-to-back, as long as the support plate facing outwards has ventilation holes that allow external airflow to enter the heat dissipation device 10 axially.

[0068] like Figure 6 As shown, one embodiment of this application also provides an electric motor, which includes a stator assembly 40 and the aforementioned rotor assembly. The stator assembly 40 is sleeved on the outer periphery of the rotor assembly, stator windings 42 are disposed in the winding slots of the stator core 41, and end windings 421 protrude relative to the axial end of the rotor core 21 of the rotor 20, surrounding the heat dissipation device 10.

[0069] The heat dissipation device 10 can be provided at least one of the two axial ends of the rotor 20. Preferably, the heat dissipation device 10 is provided at both axial ends of the rotor 20. Figure 7 A cross-sectional view of an electric motor according to an embodiment of this application is shown. In this motor structure, the rotor 20 has an axial ventilation channel 23 and a radial ventilation channel inside. A heat dissipation device 10 is installed at both ends of the rotor 20. In this case, the external cooling airflow used to cool the rotor 20 can enter from both ends along the axial ventilation channel 23 and flow out along the radial ventilation channel of the rotor 20, or enter the axial ventilation channel 23 from one axial end of the rotor 20, and then some of the airflow flows out along the radial ventilation channel of the rotor 20 and flows out from the other axial end of the rotor 20.

[0070] Figure 8 A schematic diagram of the flow path of cooling airflow in an electric motor according to an embodiment of this application is shown.

[0071] like Figure 8As shown, the heat dissipation devices 10 are installed at both axial ends of the rotor 20. The second support plates 12 of the heat dissipation devices 10 at both ends are installed facing the axial ends of the rotor 20, meaning the heat dissipation devices 10 at both ends are installed back-to-back, with opposite installation directions. When the heat dissipation devices 10 rotate with the rotor 20, the baffle 13 disturbs the surrounding air to form a cooling airflow. The airflow is axially drawn into the space between the second support plate 12 and the first support plate 11 through the first ventilation hole 141 on the first support plate 11. Part of the airflow changes its path, changing from axial flow to radial flow, directly blowing onto the end winding 421 to cool it. The other part of the airflow maintains its axial path, passes through the second support plate 12, and enters the axial ventilation channel 23 from one side of the rotor 20. Since heat dissipation devices 10 are provided at both axial ends of the rotor 20, airflow enters from both sides of the axial flow channel of the rotor 20, gathers inside the rotor core 21, and is discharged outwards along the radial direction of the rotor 20 from the channel between the rotor cores 21, thus cooling the rotor 20.

[0072] like Figure 9 As shown, two heat dissipation devices 10 are respectively installed at both ends of the rotor 20 along its axial direction. Figure 8 The difference is that the second support plate 12 of one of the heat dissipation devices 10 at both ends is installed facing the axial end of the rotor 20, while the first support plate 11 of the other is installed facing the axial end of the rotor 20. In other words, the heat dissipation devices 10 at both ends are arranged in the same direction. When the heat dissipation device 10 rotates with the rotor 20, since both ends of the rotor 20 are equipped with heat dissipation devices 10, the airflow path of the first heat dissipation device 10 located at the first axial end of the rotor 20 is... Figure 8As shown, the baffle 13 disturbs the surrounding air to form a cooling airflow. The airflow is axially drawn into the space between the second support plate 12 and the first support plate 11 through the first ventilation hole 141 on the first support plate 11. Part of the airflow changes its path, changing from axial inflow to radial outflow, and blows directly onto the end winding 421 to cool the end winding 421. The other part of the airflow maintains the axial path, passes through the second ventilation hole 142 of the second support plate 12, and enters the axial ventilation channel 23 inside the rotor 20 from the first axial end of the rotor 20, and continues to flow along the axial ventilation channel 23. Then it flows out from the second axial end of the rotor 20 and enters the second heat dissipation device 10 provided at the second axial end of the rotor 20. Specifically, the airflow flows axially from the first ventilation hole 141 on the first support plate 11 of the second heat dissipation device 10 into the space between the first support plate 11 and the second support plate 12. As the second heat dissipation device 10 rotates with the rotor 20, under the disturbance of multiple baffles 13, part or all of the airflow flows outward along the radial direction of the rotor 20 from the ventilation gap of the adjacent baffles 13 and blows towards the end winding 421. At the same time, the airflow that enters the second heat dissipation device axially can also flow outward along the axial direction from the second ventilation hole provided on the second support plate.

[0073] In order to enhance the airflow to the end winding 421, the second support plate 12 (away from the axial end of the rotor 20) of the second heat dissipation device 10 can be set as a closed structure, so that the airflow entering the second heat dissipation device 10 in the axial direction flows outward from the ventilation gap of the adjacent baffle 13 along the radial direction of the rotor 20 and blows directly to the end winding 421.

[0074] If the rotor 20 also requires heat dissipation, a radial ventilation channel can be provided inside the rotor 20, allowing the airflow flowing axially into the axial ventilation channel 23 to also flow outward along the radial direction of the rotor 20 through the radial ventilation channel, thus dissipating heat from the rotor 20. If the rotor 20 does not have a corresponding heat dissipation requirement or the heat dissipation requirement of the end winding 421 is more urgent, no radial ventilation channel is provided inside the rotor 20. Users can choose to provide a radial ventilation channel inside the rotor 20 and / or set the second support plate 12 (away from the axial end of the rotor 20) of the second heat dissipation device 10 as a closed structure according to actual needs.

[0075] An embodiment of this application also provides a wind turbine generator set, which includes a nacelle, an impeller located at the front end of the nacelle, and a motor as described above disposed inside the nacelle, wherein the impeller captures wind energy to drive the shaft 30 in the motor to rotate, so that the motor converts wind energy into electrical energy.

[0076] While the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope thereof. However, it should be understood that, in the view of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention as defined in the claims.

Claims

1. A heat dissipation device for installation at the axial end of the rotor (20) of an electric motor, characterized in that, The heat dissipation device (10) includes: A first support plate (11) is provided with a plurality of first ventilation holes (141). Multiple turbulence-disrupting elements (13) are disposed on the first support plate (11) and spaced apart in the circumferential direction of the rotor (20); When the heat dissipation device (10) rotates with the rotor (20), the baffle (13) allows at least a portion of the external airflow that flows into the rotor (20) axially through the first ventilation hole (141) to flow radially outward along the rotor (20).

2. The heat dissipation device according to claim 1, characterized in that, The heat dissipation device (10) further includes a second support plate (12), which is spaced apart from the first support plate (11) in the axial direction of the rotor (20), and the turbulence member (13) is disposed between the first support plate (11) and the second support plate (12).

3. The heat dissipation device according to claim 2, characterized in that, The second support plate (12) is provided with a plurality of second ventilation holes (142), the second ventilation holes (142) enabling the airflow to flow into or out of the rotor core (21) of the rotor (20), and / or the first ventilation hole (141) enabling the airflow to flow into or out of the rotor core (21) of the rotor (20).

4. The heat dissipation device according to claim 3, characterized in that, At least a portion of the plurality of second ventilation holes (142) are aligned with at least a portion of the plurality of first ventilation holes (141) in the axial direction of the rotor (20).

5. The heat dissipation device according to claim 1, characterized in that, The spoiler (13) is sheet-shaped and extends radially along the first support plate (11).

6. The heat dissipation device according to claim 2, characterized in that, The heat dissipation device (10) further includes a bushing (15) for being fitted onto the rotating shaft (30) of the motor. The first support plate (11) is annular, and the radial inner edge of the first support plate (11) is fixedly connected to the bushing (15). And / or, the second support plate (12) is annular, and the radial inner edge of the second support plate (12) is fixedly connected to the bushing (15). And / or, the baffle (13) is fixedly connected to the bushing (15).

7. The heat dissipation device according to claim 2, characterized in that, The heat dissipation device (10) further includes a bushing (15), the first support plate (11) and the second support plate (12) are annular, the radial inner edge of the second support plate (12) is spaced at a predetermined distance from the outer peripheral surface of the bushing (15), and the projection of the second support plate (12) along the axial direction onto the first support plate (11) is located in the outer peripheral region of the first support plate (11).

8. The heat dissipation device according to claim 2, characterized in that, The first support plate (11) and / or the second support plate (12) are provided with a connecting part for fixed connection with the rotor (20).

9. A rotor assembly, characterized in that, The rotor assembly includes a rotor (20) and a heat dissipation device (10) as described in any one of claims 1 to 8, the heat dissipation device (10) being disposed at at least one of the axial ends of the rotor (20).

10. The rotor assembly according to claim 9, characterized in that, The rotor assembly also includes a shaft (30), and the heat dissipation device (10) is fixedly connected to the shaft (30) and / or the rotor (20).

11. The rotor assembly according to claim 9, characterized in that, The rotor (20) includes an axial ventilation duct (23) arranged along the axial direction of the rotor assembly, in which at least a portion of the airflow can flow.

12. The rotor assembly according to claim 11, characterized in that, The heat dissipation device (10) further includes a second support plate (12), on which a plurality of second ventilation holes (142) are provided. In the axial direction of the rotor (20), the first ventilation hole (141) is at least partially aligned with the axial ventilation channel (23), and / or the second ventilation hole (142) is at least partially aligned with the axial ventilation channel (23), and / or the first ventilation hole (141) is at least partially aligned with the second ventilation hole (142).

13. An electric motor, characterized in that, The motor includes a stator assembly (40) and a rotor assembly as described in any one of claims 9 to 12.

14. The motor according to claim 13, characterized in that, The stator assembly (40) is sleeved on the outer periphery of the rotor (20). The stator assembly (40) includes a stator core (41) and a stator winding (42). The end of the stator winding (42) protrudes relative to the axial end of the rotor core (21) of the rotor (20) and surrounds the outer periphery of the heat dissipation device (10).

15. A wind turbine generator set, characterized in that, The wind turbine generator set includes the motor as described in any one of claims 13 and 14.

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