A fan assembly and an air conditioner

Abstract

The application provides a fan assembly and an air conditioner. The fan assembly comprises a motor and a fan wheel. The motor comprises a rotor, a rotating shaft, a first bearing and a second bearing. The rotating shaft is connected with the rotor and is rotatably supported by the first bearing and the second bearing. The rotor is located between the first bearing and the second bearing. The rotating shaft comprises a first shaft section, a second shaft section and a fan wheel mounting shaft section. The fan wheel mounting shaft section is located on the side of the first bearing away from the second bearing. The part of the rotating shaft between the first bearing and the second bearing is the first shaft section. The part of the rotating shaft between the first bearing and the fan wheel mounting shaft section is the second shaft section. The fan wheel is formed with a mounting hole. The fan wheel mounting shaft section is arranged in the mounting hole to drive the fan wheel to rotate. The outer periphery of the first shaft section is provided with a first damping ring groove. The first damping ring groove is at least partially located between the first bearing and the rotor. The second shaft section is provided with an equal cross section along the axial direction. Alternatively, the outer periphery of the second shaft section is provided with a second damping ring groove. The second damping ring groove extends into the mounting hole.

Description

Technical Field

[0001] This application relates to the field of wind turbine technology, and more particularly to a wind turbine assembly and an air conditioner. Background Technology

[0002] When the operating frequency of an air conditioner fan is close to the natural frequency of the fan system during normal operation, resonance can occur. The resonance can cause significant noise, affecting the user experience. Utility Model Content

[0003] This application provides a fan assembly and an air conditioner, which helps to make the natural frequency of the fan assembly lower than the operating frequency of the fan assembly, thereby reducing resonance, and also helps to reduce the risk of shaft bending when the fan assembly is dropped during transportation.

[0004] This application provides a wind turbine assembly, including: An electric motor includes a rotor, a shaft, a first bearing, and a second bearing. The shaft is connected to the rotor and is rotatably supported by the first bearing and the second bearing. The rotor is located between the first bearing and the second bearing. The rotating shaft includes a first shaft section, a second shaft section, and a wind turbine mounting shaft section. The wind turbine mounting shaft section is located on the side of the first bearing away from the second bearing. The portion of the rotating shaft located between the first bearing and the second bearing is the first shaft section, and the portion of the rotating shaft located between the first bearing and the wind turbine mounting shaft is the second shaft section. A wind turbine is provided with mounting holes, and a mounting shaft section of the wind turbine passes through the mounting holes to drive the wind turbine to rotate. The outer circumferential surface of the first shaft segment is provided with a first damping ring groove, and the first damping ring groove is at least partially located between the first bearing and the rotor; The second shaft segment is provided with a uniform cross section along the axial direction, or the outer peripheral surface of the second shaft segment is provided with a second damping ring groove, and the second damping ring groove extends into the mounting hole.

[0005] In some embodiments, the rotor has a shaft hole through which the shaft passes, and the first damping ring groove extends into the shaft hole.

[0006] In some embodiments, the second damping ring groove includes a first groove segment and a second groove segment that are interconnected, the first groove segment being located within the mounting hole, and the second groove segment being located between the first bearing and the first groove segment; The ratio of the axial dimension of the first groove segment to the axial dimension of the wind turbine mounting shaft segment is 0.1-0.2.

[0007] In some embodiments, the rotor includes a rotor core and a plurality of magnets. The rotor core includes a plurality of core units, which are arranged circumferentially along the shaft. A receiving space is defined between each pair of adjacent core units, and the magnets are located within the corresponding receiving space. In an orthographic projection onto a plane perpendicular to the axis of rotation, the projection of the radial outer edge of the core unit is arc-shaped. The centers of the projections of the radial outer edges of each core unit do not overlap, and the center of the projection of any one of the radial outer edges of the core unit is staggered from the center of the projection of the rotor.

[0008] In some embodiments, the distance between the center of the projection of the radial outer edge of the core unit and the center of the projection of the rotor in an orthographic projection on a plane perpendicular to the axis of rotation is 0.1-0.4 to the radius of the rotor.

[0009] In some embodiments, the rotor includes an annular limiting member, which is a separate structure from the rotor core. The annular limiting member includes an annular portion and a plurality of protrusions. The annular portion is located on the outer periphery of the rotating shaft and on the radial inner side of the magnet. The plurality of protrusions are located on the outer periphery of the annular portion and are used to abut against the corresponding magnet.

[0010] In some embodiments, the core unit includes a body and a bending structure, wherein the bodies of two adjacent core units form the receiving space, and the bending structure extends from the radial inner end of the body to the radial inner side of an adjacent magnet and abuts against the corresponding magnet.

[0011] In some implementations, the main body and the bending structure are an integral structure.

[0012] In some embodiments, the end of the bent structure abuts against the corresponding magnet, and the radial distance between the remaining portion of the bent structure (excluding the end) and the corresponding magnet is not less than 1 mm.

[0013] This application also provides an air conditioner, including the fan assembly described in any embodiment of this application.

[0014] In the wind turbine assembly of this application embodiment, when a first vibration damping ring groove is provided in the first shaft segment and the second shaft segment is provided with a uniform cross-section along the axial direction, the requirement to reduce the natural frequency can be met by the first vibration damping ring groove, and the uniform cross-section of the second shaft segment can ensure bending stiffness and reduce the risk of axial bending of the second shaft segment. When the first shaft segment is provided with a first vibration damping ring groove and the second shaft segment is provided with the aforementioned second vibration damping ring groove, the requirement to reduce the natural frequency can be met by the first and second vibration damping ring grooves together, and the second vibration damping ring groove is positioned close to the wind turbine to reduce the risk of axial bending caused by the second vibration damping ring groove. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the wind turbine assembly provided in the embodiments of this application; Figure 2 This is a cross-sectional schematic diagram of the fan assembly provided in the first embodiment of this application along the AA direction (where the blades and the motor housing are omitted). Figure 3 yes Figure 2 A schematic diagram of the rotating shaft in the structure shown; Figure 4 This is a cross-sectional schematic diagram of the fan assembly provided in the second embodiment of this application along the AA direction (where the blades and the motor housing are omitted). Figure 5 yes Figure 4 A schematic diagram of the rotating shaft in the structure shown; Figure 6 This is a schematic diagram of the rotor structure provided in the third embodiment of this application; Figure 7 This is a schematic diagram of the rotor provided in the fourth embodiment of this application.

[0016] Explanation of reference numerals in the attached figures 1. Motor; 10. Rotor; 11. Magnet; 11a. Inner radial side; 11b. Outer radial side; 12. Rotor core; 121. Core unit; 121a. Outer radial edge; 1211. Main body; 1212. Bending structure; 122. Protrusion; 13. Annular limiting component; 131. Ring part; 132. Protrusion; 20. Shaft; 21. First shaft section; 211. First damping ring groove; 22. Second shaft section; 221. Second damping ring groove; 221a. First groove section; 221b. Second groove section; 23. Wind turbine mounting shaft section; 30. First bearing; 40. Second bearing; 50. Injection molded part; 2. Wind turbine; 21. Hub; 22. Blade.

[0017] It should be noted that the terms "first" and "second" mentioned above are only used to distinguish between different options and do not represent the degree of superiority or inferiority of the options or their priority in the implementation process. Detailed Implementation

[0018] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0019] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0021] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature and the second feature are in direct contact, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0023] This application provides a wind turbine assembly; please refer to [link / reference]. Figure 1 The fan assembly includes a motor 1 and a fan wheel 2.

[0024] Specifically, such as Figure 2 and Figure 4 As shown, the motor 1 includes a rotor 10, a shaft 20, a first bearing 30, and a second bearing 40. The shaft 20 is connected to the rotor 10 and is rotatably supported by the first bearing 30 and the second bearing 40. The rotor 10 is located between the first bearing 30 and the second bearing 40. In this way, the first bearing 30 and the second bearing 40 provide stable support for the shaft 20, while also helping to distribute the load during the operation of the motor 1, thus improving the overall stability of the motor 1.

[0025] In some embodiments, please refer to Figure 3 and Figure 5 The rotating shaft 20 includes a first shaft section 21, a second shaft section 22, and a wind turbine mounting shaft section 23. The wind turbine mounting shaft section 23 is located on the side of the first bearing 30 away from the second bearing 40. The portion of the rotating shaft 20 located between the first bearing 30 and the second bearing 40 is the first shaft section 21. The portion of the rotating shaft 20 located between the first bearing 30 and the wind turbine 2 mounting shaft is the second shaft section 22. The wind turbine 2 has a mounting hole, and the wind turbine mounting shaft section 23 passes through the mounting hole to drive the wind turbine 2 to rotate.

[0026] For example, the wind turbine 2 includes a hub 21 and a plurality of blades 22, the plurality of blades 22 being disposed on the outer periphery of the hub 21, and mounting holes being formed in the hub 21 so that the hub 21 is connected to the shaft 20.

[0027] In some embodiments, such as Figure 2 and Figure 4As shown, a first damping ring groove 211 is provided on the outer peripheral surface of the first shaft segment 21, and the first damping ring groove 211 is at least partially located between the first bearing 30 and the rotor 10. By providing the first damping ring groove 211, the stiffness of the rotating shaft 20 is reduced, which in turn helps to reduce the system natural frequency of the wind turbine assembly, making the natural frequency of the wind turbine assembly lower than the normal operating frequency of the wind turbine assembly. Moreover, the first bearing 30 and the second bearing 40 provide joint support for the first shaft segment 21, and providing the first damping ring groove 211 on the outer peripheral surface of the first shaft segment 21 will not excessively increase the risk of shaft bending in the first shaft segment 21.

[0028] It should be noted that the normal operating frequency of the wind turbine assembly refers to the periodic vibration frequency generated by the wind turbine rotor when the assembly is rotating normally. This vibration frequency is positively correlated with the rotor speed. When the natural frequency of the wind turbine assembly is equal to the periodic vibration frequency generated by the rotor rotation, resonance will occur.

[0029] This application embodiment reduces resonance by lowering the natural frequency of the wind turbine assembly, making it lower than the periodic vibration frequency generated by the wind turbine rotor when the wind turbine assembly is rotating normally.

[0030] like Figure 2 As shown, the second shaft segment 22 is provided with a uniform cross-section along the axial direction, that is, the second shaft segment 22 does not have the second damping ring groove 221 described below, or, as Figure 4 As shown, a second damping ring groove 221 is provided on the outer peripheral surface of the second shaft section 22, and the second damping ring groove 221 extends into the mounting hole, that is, the second damping ring groove 221 is located close to the wind turbine.

[0031] It should be noted that, please refer to Figure 4 When the second vibration damping ring groove 221 is provided in the second shaft segment, since the second vibration damping ring groove 221 extends into the mounting hole, while the axial length and radial depth of the second vibration damping ring groove 221 remain unchanged, it helps to reduce the size of the second vibration damping ring groove 221 outside the mounting hole. The axial distance a2 from the groove wall of the second vibration damping ring groove 221 near the rotor end to the impeller is shorter (this distance is the lever arm length between the groove wall and the impeller), which helps to reduce the lever arm length between the two, thereby helping to reduce the risk of shaft bending of the second shaft segment 22 at the second vibration damping ring groove 221.

[0032] In the wind turbine assembly of this application embodiment, when the first shaft segment is provided with a first damping ring groove 211 and the second shaft segment 22 is provided with a uniform cross-section along the axial direction, the first damping ring groove 211 can meet the requirement of reducing the natural frequency, and the uniform cross-section of the second shaft segment can ensure bending stiffness and reduce the risk of axial bending of the second shaft segment. When the first shaft segment is provided with a first damping ring groove 211 and the second shaft segment 22 is provided with the aforementioned second damping ring groove 221, the first and second damping ring grooves together meet the requirement of reducing the natural frequency, and the second damping ring groove 221 is positioned close to the wind turbine to reduce the risk of axial bending caused by the second damping ring groove.

[0033] It is understood that, in the embodiment where the second shaft segment 22 has a uniform cross-section along the axial direction, the axial length of the first damping ring groove 211 can be appropriately greater than the axial length of the first damping ring groove 211 in the embodiment where the second damping ring groove 221 is formed at the second shaft end 22; and / or, in the embodiment where the second shaft segment 22 has a uniform cross-section along the axial direction, the radial depth of the first damping ring groove 211 can be appropriately greater than the radial depth of the first damping ring groove 211 in the embodiment where the second damping ring groove 221 is formed at the second shaft end 22. This ensures that both the case where the second shaft segment 22 has a uniform cross-section along the axial direction and the case where the second shaft segment 22 has a uniform cross-section along the axial direction satisfy the requirement of reducing the natural frequency.

[0034] In some embodiments, the rotor 10 has a shaft hole through which the shaft 20 passes, and a first damping ring groove 211 extends into the shaft hole. By extending the first damping ring groove 211 into the shaft hole, the axial dimension of the first damping ring groove 211 can be increased, given the limited axial dimension of the shaft 20 located between the rotor 10 and the first bearing 30, thereby helping to further reduce the system natural frequency of the wind turbine assembly.

[0035] In some embodiments, the second damping ring groove 221 includes a first groove segment 221a and a second groove segment 221b that are interconnected. The first groove segment 221a is located inside the mounting hole, and the second groove segment 221b is located between the first bearing 30 and the first groove segment 221a.

[0036] The ratio of the axial dimension a1 of the first groove segment 221a to the axial dimension L1 of the wind turbine mounting shaft segment 23 is 0.1-0.2, that is, 0.1≤a1 / L1≤0.2. For example, a1 / L1 can be 0.1, 0.2, etc.

[0037] This helps to control the axial dimension a1 of the first groove segment 221a within a reasonable range, while minimizing the impact on the connection strength between the hub 21 and the shaft 20. Reducing the axial dimension of the second groove segment 221b helps to reduce the risk of shaft bending in the second shaft segment 22.

[0038] In some embodiments, please refer to Figure 6 and Figure 7 The rotor 10 includes a rotor core 12 and a plurality of magnets 11. The rotor core 12 includes a plurality of core units 121. The plurality of core units 121 are arranged circumferentially along the shaft 20. Each pair of adjacent core units 121 defines a receiving space, and the magnets 11 are located in the corresponding receiving space.

[0039] It should be noted that the interval arrangement means that there is a circumferential gap between two adjacent iron core units 121, and the two adjacent iron core units 121 do not contact each other.

[0040] Multiple magnets 11 are respectively disposed in corresponding receiving spaces. That is, one receiving space is used to place one magnet 11, and there is a one-to-one mapping relationship between the receiving spaces and the magnets 11. Two adjacent magnets 11 are separated by iron core units 121, which helps to optimize the magnetic circuit and reduce eddy current losses.

[0041] In orthographic projection onto a plane perpendicular to the axis of rotation 20, the projection of the radial outer edge 121a of the core unit 121 is arc-shaped. The centers of the projections of the radial outer edges 121a of each core unit 121 do not overlap, and the center of the projection of any one core unit 121's radial outer edge 121a is offset from the center of the projection of the rotor 10. That is, the center of the projection of any one core unit 121's radial outer edge 121a is not concentric with the center of the projection of the rotor 10. In other words, the center of the projection of any one core unit 121's radial outer edge 121a is eccentrically designed. The eccentric design can reduce the harmonic content of the air gap magnetic field, making the magnetic field distribution closer to an ideal sine wave, thereby reducing the harmonic components in the back electromotive force and helping to reduce the torque and back electromotive force of the motor 1.

[0042] For example, in the orthographic projection onto a plane perpendicular to the axis of rotation 20, the distance d1 between the center O2 of the projection of the radial outer edge 121a of the core unit 121 and the center O1 of the projection of the rotor 10, and the radius R1 of the rotor 10, is 0.1 to 0.4. That is, 0.1 ≤ d1 / R1 ≤ 0.4. For example, d1 / D1 can be 0.1, 0.2, 0.3, 0.4, etc. This helps to control the eccentricity of the radial outer edge 121a of the core unit 121 within a reasonable range.

[0043] Please see Figure 6 The radius R1 of rotor 10 refers to the radius of circle G1 that is tangent to the arc segment corresponding to the radial outer edge 121a of core unit 121 with the center of shaft 20 as the center.

[0044] In some embodiments, the center of the projection of the radial outer edge 121a of all core units 121 lies on the circumference of a circle with center O1 and radius d1.

[0045] For example, the rotor 10 includes an injection molded part 50, and the rotor core 12, magnet 11 and rotating shaft 20 are connected through the injection molded part 50.

[0046] For example, the rotor core 12, magnet 11, and shaft 20 can be placed into a mold, and then the injection molding material of the injection molded part 50 can be injected into the mold. The injection molding material of the injection molded part 50 covers the outside of the rotor core 12 and also fills the gap area between the magnet 11 and the core unit 121, the gap area between the magnet 11 and the shaft 20, and the gap area between the core unit 121 and the shaft 20. After cooling and molding, the magnet 11 and the core unit 121, the magnet 11 and the shaft 20, and the core unit 121 and the shaft 20 are all connected through the injection molded part 50. At the same time, the injection molded part 50 serves as the appearance component of the rotor 10.

[0047] In some embodiments, the rotor 10 includes an annular limiting member 13, which is a separate structure from the rotor core 12. The annular limiting member 13 includes an annular portion 131 and a plurality of protrusions 132. The annular portion 131 is located on the outer periphery of the rotating shaft 20 and on the radially inner side 11a of the magnet 11. The plurality of protrusions 132 are located on the outer periphery of the annular portion 131 and are used to abut against the corresponding magnet 11. In this way, the plurality of protrusions 132 facilitate the limiting of the radially inner side 11a of the plurality of magnets 11, and the limiting by the plurality of protrusions 132 also helps to reduce the machining requirements of the annular portion 131.

[0048] In this embodiment, the injection molded part 50 fills the area between the annular limiting member 13 and the magnet 11, the area between the annular limiting member 13 and the iron core unit 121, and the area between the annular limiting member 13 and the rotating shaft 20.

[0049] For example, the ring portion 131 and the plurality of protrusions 132 are an integral structure.

[0050] For example, the protrusion 132 abuts against the radial inner side 11a of the magnet 11 in the middle region along the circumference, so that the protrusion 132 is at a distance from the radial inner side 11a of the core unit 121. Moreover, the protrusion 132 makes the ring 131 at a distance from the radial inner side 11a of the core unit 121. Thus, regardless of whether the annular limiting member 13 is magnetic, it helps to reduce the number of magnetic field lines passing through the protrusion 132 and the ring 131 along the radial inner side 11a of the core unit 121, thereby helping to reduce magnetic leakage.

[0051] In some embodiments, the core unit 121 includes a body 1211 and a bending structure 1212. The bodies 1211 of every two adjacent core units 121 form a receiving space, and the bending structure 1212 is wound from the radially inner end of the body 1211 to the radially inner side 11a of an adjacent magnet 11 and abuts against the corresponding magnet 11. This forms a limit on the radially inner side 11a of the magnet 11.

[0052] It is understood that in this embodiment, only the end of the bent structure 1212 may abut against the magnet 11, while the rest of the bent structure 1212 may have a radial distance from the magnet 11, meaning that the rest of the bent structure 1212 does not contact the magnet 11.

[0053] For example, the injection molding material of the injection molded part 50 can be injected between the bent structure 1212, except for the end portion, and the magnet 11.

[0054] For example, the radial distance t1 between the remaining portion of the bent structure 1212 (excluding the end) and the radial inner end face of the magnet 11 is not less than 1 mm, i.e., t1 ≥ 1 mm. In this way, the end of the bent structure 1212 not only limits the radial inner side 11a of the magnet 11, but also helps to reduce the number of magnetic field lines of the magnet 11 passing through the bent structure 1212, thereby reducing magnetic leakage.

[0055] For example, the main body 1211 and the bending structure 1212 are an integral structure. This facilitates increased connection stability between the main body 1211 and the bending structure 1212, while also helping to reduce assembly requirements.

[0056] In some embodiments, the body 1211 includes a plurality of stacked sheets, which are stacked along the axial direction.

[0057] In this embodiment, the stacked sheet and the bending structure 1212 are an integral structure.

[0058] It should be noted that in this embodiment, all the laminates may be connected to the bending structure 1212, or only some of the laminates may be connected to the bending structure 1212. It is only necessary to ensure that the bending structure 1212 can limit the radial inner side 11a of the magnet 11.

[0059] For example, the bending structure 1212 is connected to the outermost laminations on both sides of the main body 1211 along the axial direction. This achieves the limitation of the radial inner side 11a of the magnet 11 on both sides along the axial direction, thereby limiting the overall position of the magnet 11.

[0060] It is understandable that the outermost stack can include one stack or multiple stacks.

[0061] In some embodiments, please refer to Figure 6The outer radial end of the core unit 121 has protrusions 122 formed on opposite sides in the circumferential direction, and the magnet 11 is located on the inner radial side 11a of the protrusion 122. The protrusion 122 is used to limit the outer radial side 11b of the magnet 11 in the radial direction, so that the magnet 11 is located more stably in the receiving space.

[0062] For example, the protrusions 122 of two adjacent core units 121 are spaced apart circumferentially. In this way, the magnet 11 is limited while the two adjacent core units 121 do not come into contact, which helps to reduce magnetic leakage.

[0063] For example, please continue reading Figure 6 The ratio of the circumferential distance c1 between the protrusions 122 of two adjacent core units 121 to the radius R1 of the rotor 10 is 0.1 to 0.2. That is, 0.1 ≤ c1 / R1 ≤ 0.2. For example, c1 / R1 can be 0.1, 0.2, etc. This helps to control the distance between the protrusions 122 of two adjacent core units 121 within a reasonable range. On the one hand, it ensures that the protrusions 122 have a certain size in the circumferential direction to limit the radial outer side 11b of the magnet 11. On the other hand, it also helps to minimize the contact between the two protrusions 122 and prevent leakage magnetism.

[0064] This application also provides an air conditioner including a fan assembly according to any embodiment of this application. When the fan assembly is applied to an air conditioner, excessive noise can affect users' rest, especially when the air conditioner is operating at night, when users are particularly sensitive to noise. The fan assembly of this application helps reduce resonance, thereby helping to reduce the noise during the operation of the air conditioner, and is suitable for use in air conditioners.

[0065] In the description of this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or at least two embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine different embodiments or examples described in this application, as well as features of different embodiments or examples.

[0066] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A fan assembly, characterized in that, include: An electric motor includes a rotor, a shaft, a first bearing, and a second bearing. The shaft is connected to the rotor and is rotatably supported by the first bearing and the second bearing. The rotor is located between the first bearing and the second bearing. The rotating shaft includes a first shaft section, a second shaft section, and a wind turbine mounting shaft section. The wind turbine mounting shaft section is located on the side of the first bearing away from the second bearing. The portion of the rotating shaft located between the first bearing and the second bearing is the first shaft section, and the portion of the rotating shaft located between the first bearing and the wind turbine mounting shaft is the second shaft section. A wind turbine is provided with mounting holes, and a mounting shaft section of the wind turbine passes through the mounting holes to drive the wind turbine to rotate. The outer circumferential surface of the first shaft segment is provided with a first damping ring groove, and the first damping ring groove is at least partially located between the first bearing and the rotor; The second shaft segment is provided with a uniform cross section along the axial direction, or the outer peripheral surface of the second shaft segment is provided with a second damping ring groove, and the second damping ring groove extends into the mounting hole.

2. The wind turbine assembly according to claim 1, characterized in that, The rotor has a shaft hole, the shaft passes through the shaft hole, and the first damping ring groove extends into the shaft hole.

3. The wind turbine assembly according to claim 1, characterized in that, The second damping ring groove includes a first groove segment and a second groove segment that are interconnected. The first groove segment is located inside the mounting hole, and the second groove segment is located between the first bearing and the first groove segment. The ratio of the axial dimension of the first groove segment to the axial dimension of the wind turbine mounting shaft segment is 0.1-0.

2.

4. The wind turbine assembly according to any one of claims 1 to 3, characterized in that, The rotor includes a rotor core and a plurality of magnets. The rotor core includes a plurality of core units, which are arranged circumferentially along the shaft. A receiving space is defined between each pair of adjacent core units, and the magnets are located within the corresponding receiving space. In an orthographic projection onto a plane perpendicular to the axis of rotation, the projection of the radial outer edge of the core unit is arc-shaped. The centers of the projections of the radial outer edges of each core unit do not overlap, and the center of the projection of any one of the radial outer edges of the core unit is staggered from the center of the projection of the rotor.

5. The wind turbine assembly according to claim 4, characterized in that, The ratio of the distance between the center of the projection of the radial outer edge of the core unit and the center of the projection of the rotor in an orthographic projection perpendicular to the axis of rotation, to the radius of the rotor, is 0.1 to 0.

4.

6. The wind turbine assembly according to claim 4, characterized in that, The rotor includes an annular limiting member, which is a separate structure from the rotor core. The annular limiting member includes an annular portion and multiple protrusions. The annular portion is located on the outer periphery of the rotating shaft and on the radial inner side of the magnet. The multiple protrusions are located on the outer periphery of the annular portion and are used to abut against the corresponding magnet.

7. The wind turbine assembly according to claim 4, characterized in that, The core unit includes a main body and a bending structure. The main bodies of two adjacent core units form the receiving space. The bending structure extends from the radial inner end of the main body to the radial inner side of an adjacent magnet and abuts against the corresponding magnet.

8. The wind turbine assembly according to claim 7, characterized in that, The main body and the bending structure are an integral structure.

9. The wind turbine assembly according to claim 7, characterized in that, The end of the bent structure abuts against the corresponding magnet, and the radial distance between the remaining parts of the bent structure (excluding the end) and the corresponding magnet is not less than 1 mm.

10. An air conditioner, characterized in that, Includes the wind turbine assembly as described in any one of claims 1 to 9.

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