Rotor, motor and fan

Abstract

This invention provides a rotor, a motor, and a fan. The rotor includes a rotating shaft that rotates axially and a rotor frame fixed to the rotating shaft. The rotor frame includes: a rotor platform with the rotating shaft arranged radially inward thereon, the rotor platform being fixedly connected to the rotating shaft, and a balancing component disposed on the rotor platform; and a rotor housing fixedly connected to the rotor platform, the rotor housing being disposed on a rotor magnet. By using a component different from the rotor housing, namely the rotor platform carrying the balancing component, which is fixedly connected to the rotating shaft, the strength of the connection between the rotor frame and the rotating shaft can be improved compared to the conventional method of using the rotor housing to fix the rotating shaft. Furthermore, since the rotor platform can carry the balancing component, there is no need to set other components carrying the balancing component on the rotor frame, which can reduce the number of components and simplify the assembly process.

Description

Technical Field

[0001] This utility model relates to the field of electromechanical engineering, and in particular to a rotor, motor, and fan. Background Technology

[0002] With the development of science and technology, motors, as a common power source, are widely used in various electrical devices. For example, motors can be used in household appliances, office automation equipment, industrial equipment, transportation equipment, etc.

[0003] The motor has a rotor, wherein the rotor includes a rotor housing that is directly fixedly connected to the rotating shaft of the motor, and magnets are disposed on the rotor housing. Driven by the stator, the rotor housing drives the rotating shaft to rotate.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Utility Model Content

[0005] The inventors discovered that in the existing solutions described above, the rotor housing is directly fixed to the rotating shaft. However, since the rotor housing is typically stamped, its thickness cannot be guaranteed due to limitations in design, manufacturing processes, and materials. If the rotor housing is directly fixed to the rotating shaft, the connection strength cannot be guaranteed, and there is a risk of breakage due to insufficient connection strength between the rotor housing and the rotating shaft when the rotor speed is too high.

[0006] To address one or more of the aforementioned problems or other similar issues, embodiments of the present invention provide a rotor, motor, and fan that can improve the strength of the connection between the rotor frame and the rotating shaft.

[0007] According to a first aspect of the present invention, a rotor is provided, comprising a rotating shaft that rotates axially and a rotor frame fixed to the rotating shaft. The rotor frame includes: a rotor platform on which the rotating shaft is disposed radially inward, the rotor platform being fixedly connected to the rotating shaft and having a balancing component disposed thereon; and a rotor housing fixedly connected to the rotor platform and having a rotor magnet disposed thereon.

[0008] In some embodiments, the rotor platform includes a platform portion located between a first end portion radially inner to the rotor platform and a second end portion radially outer to the rotor platform, wherein the first end portion has a greater axial thickness than the platform portion has a greater axial thickness.

[0009] In some embodiments, at least one rib is provided on the radially outer side of the first end.

[0010] In some embodiments, a second end portion of the radially outer side of the rotor platform is formed with an edge portion extending to one axial side, and the rotor housing includes an axially extending wall portion, wherein the edge portion and at least a portion of the wall portion coincide axially.

[0011] In some embodiments, a balancing groove is formed at the second end of the radially outer side of the rotor platform for accommodating the balancing component, wherein the balancing groove is disposed on the surface of the second end of the radially outer side of the rotor platform on the axial side opposite to the surface.

[0012] In some embodiments, the rotor platform is formed by powder metallurgy or casting.

[0013] In some embodiments, the rotor housing includes a radially extending connecting portion, and the rotor platform is riveted to the connecting portion of the rotor housing.

[0014] According to another aspect of the embodiments of this application, a motor is provided, the motor including the rotor described in any of the above embodiments.

[0015] According to another aspect of the embodiments of this application, a fan is provided, the fan including an impeller; and a motor as described in any of the above embodiments, the motor being used to drive the impeller to rotate.

[0016] In some embodiments, the impeller and the rotor of the motor do not coincide in the axial direction.

[0017] One of the beneficial effects of this utility model embodiment is that, by using a component different from the rotor housing, namely a rotor platform equipped with a balancing component, which is fixedly connected to the rotating shaft, the strength of the connection between the rotor frame and the rotating shaft can be improved compared with the traditional method of directly fixing the rotor housing and the rotating shaft. Furthermore, since the rotor platform can carry the balancing component, there is no need to set other components carrying the balancing component on the rotor frame, which can reduce the number of components and simplify the assembly process.

[0018] The embodiments of this utility model are disclosed in detail with reference to the following description and accompanying drawings. It should be understood that the scope of the embodiments of this utility model is not limited thereto. Within the spirit and scope of the appended claims, the embodiments of this utility model include many changes, modifications, and equivalents.

[0019] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0020] The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 This is a cross-sectional schematic diagram of a fan along its axis according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic cross-sectional view of the rotating shaft and rotor frame along the axis of an embodiment of the present invention;

[0023] Figure 3 This is a perspective view of the rotating shaft and rotor frame according to an embodiment of the present invention;

[0024] Figure 4 This is a bottom view of the rotating shaft and rotor frame according to an embodiment of the present invention;

[0025] Figure 5 This is another perspective view of the rotating shaft and rotor frame according to an embodiment of the present utility model;

[0026] Figure 6 This is a top view of the rotating shaft and rotor frame according to an embodiment of the present invention. Detailed Implementation

[0027] Referring to the accompanying drawings, the foregoing and other features of this utility model will become apparent from the following description. Specific embodiments of this utility model are specifically disclosed in the description and drawings, illustrating partial implementations in which the principles of this utility model can be employed. It should be understood that this utility model is not limited to the described embodiments; rather, it includes all modifications, variations, and equivalents falling within the scope of the appended claims.

[0028] In embodiments of this utility model, the term "and / or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising," "including," "having," etc., refer to the presence of the stated features, elements, components, or assemblies, but do not exclude the presence or addition of one or more other features, elements, components, or assemblies.

[0029] In this embodiment of the invention, the singular forms "a," "the," etc., may include the plural forms and should be broadly interpreted as "a kind" or "a class" rather than limited to the meaning of "an." Furthermore, the term "the" should be understood to include both the singular and plural forms unless the context explicitly indicates otherwise. Additionally, the term "according to" should be understood as "at least partially based on…," and the term "based on" should be understood as "at least partially based on…," unless the context explicitly indicates otherwise.

[0030] Furthermore, in the following description of this utility model, for ease of explanation, the direction parallel to the direction extending from the central axis CC' of the rotation shaft is referred to as the "axial direction," the radial direction centered on the central axis is referred to as the "radial direction," and the direction around the central axis is referred to as the "circumferential direction." The side away from the central axis along the radial direction is referred to as the "radial outer side," and the side closer to the central axis along the radial direction is referred to as the "radial inner side." It is worth noting that the definitions of each direction in this specification are only for the convenience of explaining the embodiments of this utility model and do not limit the direction of the rotor, motor, and fan during use and manufacturing.

[0031] The embodiments of this utility model will now be described with reference to the accompanying drawings.

[0032] First aspect of the embodiments

[0033] An embodiment of the first aspect of this application provides a rotor.

[0034] In the embodiments of the first aspect of this application, the rotor of the embodiment of the present application is described exemplarily as a rotor of a motor applied to a fan. However, the present application is not limited thereto, and the rotor of the embodiment of the present application may also be a rotor of a motor applied to other devices.

[0035] Figure 1 This is a cross-sectional schematic diagram along the axis of a fan according to an embodiment of this utility model. For example... Figure 1 As shown, rotor 1 is the rotor in motor 10, and motor 10 is used in fan 100.

[0036] The rotor 1 has a rotating shaft 11 that rotates axially and a rotor frame 12 fixed to the rotating shaft 11. The rotor frame 12 includes a rotor platform 121 and a rotor housing 122. The rotating shaft 11 is disposed radially inside the rotor platform 121, and the rotor platform 121 is fixedly connected to the rotating shaft 11. The rotor platform 121 is equipped with a balancing component (not shown). The rotor housing 122 is fixedly connected to the rotor platform 121, and the rotor housing 122 is equipped with a rotor magnet 13.

[0037] Therefore, a rotor frame 12 consisting of a rotor platform 121 and a rotor housing 122 is provided on the outer periphery of the rotating shaft 11. The rotor housing 122 is used to house the rotor magnet 13, and the rotor platform 121 is used to house the balancing components. The rotor housing 122 is fixedly connected to the rotor platform 121, and the rotor platform 121 is fixedly connected to the rotating shaft 11. Through the above structure and connection relationship, the rotor housing 122 drives the rotor platform 121 to rotate, and the rotor platform 121 drives the rotating shaft 11 to rotate.

[0038] In this embodiment, a rotor platform 121, which carries a balancing component, is fixedly connected to the rotating shaft 11 through a component different from the rotor housing 122. Compared with the conventional method of directly fixing the rotor housing 122 to the rotating shaft 11, this method can improve the strength of the connection between the rotor frame 12 and the rotating shaft 11. Furthermore, since the rotor platform 121 can carry the balancing component, there is no need to set other components carrying the balancing component on the rotor frame 12, which can reduce the number of components and simplify the assembly process.

[0039] The above description only illustrates the structure of the motor related to this utility model. Those skilled in the art should understand that the motor 10 may also have a stator, bearings, etc. For other components of the motor 10, please refer to relevant technologies, which are omitted here.

[0040] In rotor 1 of this application embodiment, as Figure 1 As shown, the rotor 1 of the motor 10 has a direction along the axial direction (from C to C', i.e. Figure 1 The rotor platform 121 of the rotor frame 12 is fixedly disposed radially outside the rotating shaft 11 relative to the rotating shaft 11, allowing the rotor frame 12 to be connected to the rotating shaft 11 via the rotor platform 121. The rotor platform 121 extends radially in an annular shape, and one axial side of the rotor platform 121 (in the vertical direction) Figure 1 The rotor housing 122 is provided on the C side (in the middle), and on the other side (axially) Figure 1 A balancing component is arranged on the C' side of the rotor platform 121. The rotor housing 122 is fixedly connected to the rotor platform 121 at a position on the radially outer side away from the central axis, and a rotor magnet 13 is arranged on the radially inner side of the rotor housing 122.

[0041] In some embodiments, a rotating shaft 11 is provided on the radially inner side of the rotor platform 121 of the rotor frame 12, and the rotor platform 121 is fixedly connected to the rotating shaft 11. This fixed connection includes two connection methods: direct fixed connection and indirect fixed connection.

[0042] For example, the rotor platform 121 can be directly fixedly connected to the rotating shaft 11, with the radial inner side of the rotor platform 121 connected to the radial outer side of the rotating shaft 11, and various fixed connections can be made by methods such as cold fitting, mechanical pressing, and bonding.

[0043] For example, the rotor platform 121 can be indirectly fixed to the rotating shaft 11 via other fixing components. The radially inner side of the fixing component is connected to the radially outer side of the rotating shaft 11, and the radially outer side of the fixing component is connected to the radially inner side of the rotor platform 121. The fixing component only needs to be able to connect the rotor platform 121 to the rotating shaft 11; the specific structure of the fixing component is not limited here. This fixing component can be any component other than the rotor housing 122.

[0044] Figure 2 This is a cross-sectional schematic diagram along the axis of the rotating shaft and rotor frame according to an embodiment of the present invention. Figure 1 The schematic diagram is obtained by rotating the rotor frame 12 clockwise by 180 degrees.

[0045] In some embodiments, the rotor platform 121 includes a platform portion 1211 located between a first end portion 1211a on the radially inner side and a second end portion 1211b on the radially outer side of the rotor platform 121, wherein the first end portion 1211a has a greater axial thickness than the platform portion 1211.

[0046] like Figure 2 As shown, the rotor platform 121 has a first end 1211a and a second end 1211b. The first end 1211a is located radially inner to the rotor platform 121 and is fixedly connected to the rotating shaft 11. The second end 1211b is located radially outer to the rotor platform 121. The rotor platform 121 has an annular platform portion 1211 formed radially between the first end 1211a and the second end 1211b.

[0047] The first end 1211a extends from the other side (C' side) of the rotor platform 121 along the axial direction. Figure 2 The surface above the center faces the axial direction to one side (C side). Figure 2 The first end portion 1211a extends from the bottom of the first end portion 1211a, and the axial height of the first end portion 1211a is equal to the thickness of the first end portion 1211a. The axial height of the platform portion 1211 is equal to the thickness of the platform portion 1211, and the thickness of the platform portion 1211 is less than the thickness of the first end portion 1211a.

[0048] Therefore, by making the thickness of the first end portion 1211a greater than the thickness of the platform portion 1211, the strength of the fixed connection between the rotor platform 121 and the rotating shaft 11 can be further increased.

[0049] The thickness of the first end 1211a can be set according to the actual situation. For example, the optimal value can be calculated based on the rotational speed that the rotor 1 needs to support.

[0050] In some embodiments, the rotor platform 121 is formed by powder metallurgy or casting.

[0051] Therefore, through the above processing technology, the inner diameter of the first end 1211a of the rotor platform 121 connected to the rotating shaft 11 can be precision machined, which helps to improve the perpendicularity between the inner diameter and the upper surface, helps to reduce the end runout of the rotor platform 121, and thus helps to reduce the vibration and noise generated by the rotor frame 12 during rotation.

[0052] Figure 3 This is a perspective view of the rotating shaft and rotor frame according to an embodiment of the present invention. Figure 4 This is a bottom view of the rotating shaft and rotor frame according to an embodiment of the present invention. The bottom view direction here is based on... Figure 2 The orientation of the rotating shaft and rotor frame shown in the figure is determined by the angle of placement. This application does not limit the orientation of the rotating shaft and rotor frame during use and manufacturing.

[0053] In some embodiments, at least one rib 1212 is provided on the radially outer side of the first end portion 1211a.

[0054] For example, such as Figure 3 and Figure 4 As shown, a plurality of ribs 1212 are provided radially outward of the first end portion 1211a, and these plurality of ribs 1212 are located on one axial side of the platform portion 1211. Figure 1 (C side). Four ribs 1212 are symmetrically arranged on both sides of the first end 1211a in the radial direction. Alternatively, other numbers, such as three, may be provided depending on the actual situation. This embodiment of the invention does not limit this. The cross-section of the rib 1212 is approximately a right-angled triangle. Depending on the actual situation, the rib 1212 can be set in different shapes, such as quadrilaterals, trapezoids, etc. This embodiment of the invention does not limit this.

[0055] Thus, by providing at least one rib 1212 at the first end 1211a of the rotor platform 121, the radial structural strength of the rotor frame 12 is further increased, and the rotational speed that the rotor frame 12 can withstand is improved.

[0056] In some embodiments, the second end portion 1211b of the rotor platform 121 on the radially outer side is formed with an edge portion 1213 extending to one side in the axial direction, and the rotor housing 122 includes a wall portion 1221 extending in the axial direction, wherein the edge portion 1213 and at least a portion of the wall portion 1221 coincide in the axial direction.

[0057] Thus, by wrapping at least a portion of the wall portion 1221 of the rotor housing 122 with the edge portion 12131 of the rotor platform 121, the rotor platform 121 provides radial support force to the rotor housing 122 in the radial direction, which further improves the structural strength of the rotor frame 12 and further improves the stability of the rotor 1 during rotation, and helps to reduce the vibration and noise generated by the rotor frame 12 during rotation.

[0058] like Figure 2 and 3 As shown, the rotor housing 122 has a connecting portion 1222 that is fixedly connected to the rotor platform 121. The radially outer edge of the connecting portion 1222 extends along one axial side to form a wall portion 1221, as shown. Figure 1 As shown, the rotor magnet 13 is disposed on the side of the wall portion 1221 of the rotor housing 122 near the rotation axis 11. The axial height of this wall portion 1221 is such that it can support the rotor magnet 13 in place.

[0059] like Figure 2 and Figure 3 As shown, the second end 1211b of the platform portion 1211 of the rotor platform 121 extends radially outward to one side to form an edge portion 1213. The edge portion 1213 is disposed on the outer periphery of the wall portion 1221 of the rotor housing 122. The axial height of the edge portion 1213 is such that it can coincide with at least a portion of the wall portion 1221 in the axial direction.

[0060] For example, the connecting portion 1222 of the rotor housing 122 extends radially and forms an R-angle with the wall portion 1221 at the connection position. The edge portion 1213 extends axially to the lowest point of the R-angle or a position lower than the lowest point, so that the edge portion 1213 can reliably wrap around the wall portion 1221 of the rotor housing 122. The height, radial thickness, etc. of the edge portion 1213 can be determined according to the actual situation, for example, the optimal values ​​can be calculated based on factors such as the rotational speed that the rotor 1 needs to support.

[0061] In some embodiments, the radially extending connecting portion 1222 of the rotor housing 122 is connected to the connecting portion 1222 of the rotor platform 121 and the rotor housing 122 by riveting.

[0062] like Figure 3 As shown, the connecting part 1222 is annular, and is axially riveted and fixed to the platform part 1211 of the rotor platform 121 by rivets at equal intervals. In this embodiment, the rotor platform 121 is connected to the rotor housing 122 by riveting. Alternatively, depending on the actual situation, the rotor platform 121 and the rotor housing 122 can be fixedly connected by pressing or by adhesive bonding. This embodiment of the present invention does not limit the method.

[0063] Therefore, the radially overlapping parts of the rotor platform 121 and the rotor housing 122 are connected by riveting, which increases the connection strength between the rotor platform 121 and the rotor housing 122 and further improves the structural strength of the rotor frame 12.

[0064] Figure 5 This is another schematic diagram of the rotating shaft and rotor frame according to an embodiment of the present invention. Figure 6 This is a top view of the rotating shaft and rotor frame according to an embodiment of the present invention. The top view direction here is based on... Figure 2 The orientation of the rotating shaft and rotor frame shown in the figure is determined by the angle of placement. This application does not limit the orientation of the rotating shaft and rotor frame during use and manufacturing.

[0065] In some embodiments, the second end 1211b of the rotor platform 121, which is radially outer, is formed with a balancing groove 1214 for accommodating a balancing component (not shown), wherein the balancing groove 1214 is disposed on the surface of the second end 1211b of the rotor platform 121, which is radially outer, on the other side of the axial direction.

[0066] For example, such as Figure 5 and Figure 6 As shown, on the other side of the axial direction of the rotor platform 121 ( Figure 2 A balancing groove 1214 is formed on the C' side of the rotor platform 121 to accommodate balancing components used for dynamic balancing repair. This balancing groove 1214 is located near the circumferential edge of the rotor platform 121 and extends from the axial side of the rotor platform 121. Figure 2 The surface of the middle C' side faces the axial side ( Figure 2 The C-side is concave, forming a ring shape. For example... Figure 2 As shown, the balancing groove 1214 is located on the surface of the second end 1211b on the radially outer side of the rotor platform 121, on the opposite side of the axial direction. For example, the balancing groove 1214 is positioned on the rotor platform 121 as far away from the rotation axis 11 as possible, so that the annular balancing groove 1214 has the largest possible radius. This ensures the effectiveness of dynamic balance correction; for example, dynamic balance correction can be effectively performed using fewer balancing components.

[0067] For example, such as Figure 2As shown, when viewed axially, the balancing groove 1214 coincides with the wall 1221 of the rotor housing 122. However, this application is not limited to this; when viewed axially, the balancing groove 1214 may not coincide with the wall 1221 of the rotor housing 122. The specific position of the balancing groove 1214 can be set according to actual needs, ensuring that the thickness of the second end 1211b is not affected, and that the edge 1213 of the second end 1211b can cover the wall 1221 of the rotor housing 122. As mentioned above, the balancing groove 1214 can be formed by recessing from the surface on the other side of the rotor platform 121 towards one side of the axial direction. This application is not limited to this; the balancing groove 1214 can also be formed in other ways.

[0068] Therefore, by providing a balancing groove 1214 on the rotor platform 121 to accommodate the balancing component, the balancing component can be reliably fixed through the balancing groove 1214; and thus, balancing repair can be performed without adding a conventional resin balancing ring to the rotor frame 12, simplifying the structure of the rotor 1, while avoiding the problem of conventional resin balancing rings bursting due to high-speed rotation.

[0069] According to the above embodiments, by using a component different from the rotor housing 122, namely the rotor platform 121 carrying the balancing component, which is fixedly connected to the rotating shaft 11, the strength of the connection between the rotor frame 12 and the rotating shaft 11 can be improved compared with the conventional method of using the rotor housing 122 to fixally connect to the rotating shaft 11. Furthermore, since the rotor platform 121 can carry the balancing component, it is not necessary to set other components carrying the balancing component on the rotor frame 12, which can reduce the number of components and simplify the assembly process.

[0070] Second aspect of the embodiments

[0071] This utility model provides a motor 10, which includes the rotor 1 described in the first aspect embodiment. Since the structure of the rotor 1 has been described in the first aspect embodiment, the content is incorporated herein and will not be repeated here.

[0072] In the above embodiments, only the structure related to the motor in the present utility model embodiment has been described. For other structures of the motor, please refer to the relevant technology, and the description is omitted here.

[0073] In the motor 10 of this embodiment, since the rotor 1 described in Embodiment 1 is used, a rotor platform 121 with a balancing component, which is different from the rotor housing 122, is fixedly connected to the rotating shaft 11. Compared with the conventional method of fixing the rotor housing 122 to the rotating shaft 11, the strength of the connection between the rotor frame 12 and the rotating shaft 11 can be improved. Furthermore, since the rotor platform 121 can carry the balancing component, it is not necessary to additionally set other components with balancing components on the rotor frame 12, which can reduce the number of components and simplify the assembly process. As a result, the strength of the motor 10 can be improved, the number of components of the motor 10 can be reduced, and the assembly process can be simplified.

[0074] In this embodiment, the motor can be any type of motor, and the motor can be applied to any electrical product. For example, the electrical product can be a vehicle-mounted product that uses a motor, such as an automotive electronic vacuum pump, automotive brake, automotive transmission, etc.; or it can be various information devices, industrial equipment, etc. that use a motor; or it can be a household appliance such as an indoor unit of an air conditioner, an outdoor unit of an air conditioner, a water dispenser, a washing machine, a cleaning machine, a compressor, a blower, a mixer, etc.

[0075] Third aspect of the embodiments

[0076] This application provides a fan 100, which includes a motor 10 as described in the second aspect embodiment, and the motor 10 includes a rotor 1 as described in the first aspect embodiment. Since the structure of the rotor 1 has already been described in the first aspect embodiment, its content is incorporated herein and will not be repeated here.

[0077] like Figure 1 As shown, the fan 100 includes a motor 10 and an impeller 20, the motor 10 driving the impeller 20 to rotate about the central axis CC'.

[0078] In some embodiments, such as Figure 1 As shown, the impeller 20 and the rotor 1 of the motor 10 do not coincide in the axial direction.

[0079] The fan 100 according to the embodiments of this application adopts the rotor 1 structure described in the first aspect embodiment. It is fixedly connected to the rotating shaft 11 via a component different from the rotor housing 122, namely a rotor platform 121 carrying a balancing component. Compared to the conventional method of fixing the rotor housing 122 to the rotating shaft 11, this improves the strength of the connection between the rotor frame 12 and the rotating shaft 11. Furthermore, since the rotor platform 121 can carry the balancing component, there is no need to additionally install other components carrying the balancing component on the rotor frame 12, reducing the number of components and simplifying the assembly process. Therefore, the strength of the fan 100 is improved, the number of components in the fan 100 is reduced, and the assembly process is simplified.

[0080] The present invention has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present invention. Those skilled in the art can make various modifications and variations to the present invention based on its spirit and principles, and these modifications and variations are also within the scope of the present invention.

Claims

1. A rotor comprising a rotating shaft that rotates axially and a rotor frame fixed to said rotating shaft, characterized in that, The rotor frame includes: A rotor platform, with the rotating shaft arranged radially inward, the rotor platform being fixedly connected to the rotating shaft, and the rotor platform being equipped with a balancing component; and The rotor housing is fixedly connected to the rotor platform, and the rotor housing is equipped with rotor magnets.

2. The rotor according to claim 1, characterized in that, The rotor platform includes a platform portion located between a first end on the radially inner side and a second end on the radially outer side of the rotor platform, wherein the thickness of the first end in the axial direction is greater than the thickness of the platform portion in the axial direction.

3. The rotor according to claim 2, characterized in that, At least one rib is provided on the radially outer side of the first end.

4. The rotor according to claim 1, characterized in that, The second end of the rotor platform, on its radially outer side, has an edge extending towards one axial direction. The rotor housing includes a wall extending axially. The edge portion and at least a portion of the wall portion coincide in the axial direction.

5. The rotor according to claim 1, characterized in that, The second end of the radially outer side of the rotor platform is formed with a balancing groove for accommodating the balancing component, wherein the balancing groove is disposed on the surface of the second end of the radially outer side of the rotor platform on the axial side of the other side.

6. The rotor according to claim 1, characterized in that, The rotor platform is formed by powder metallurgy or casting.

7. The rotor according to claim 1, characterized in that, The rotor housing includes a connecting portion extending radially. The rotor platform is connected to the connecting part of the rotor housing by riveting.

8. A motor, characterized in that, The motor includes the rotor as described in any one of claims 1 to 7.

9. A fan, characterized in that, The fan includes: Impeller; and The motor of claim 8, wherein the motor is used to drive the impeller to rotate.

10. The fan according to claim 9, characterized in that, The impeller and the rotor of the motor do not coincide in the axial direction.

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