Rotor, motor and fan

Abstract

The utility model belongs to rotor manufacturing technical field discloses a kind of rotor, motor and fan.Rotor includes rotor body and magnetic piece, rotor body is annular, magnetic piece is fixed in the inside of rotor body, and magnetic piece is used for processing to remove quantity.The rotor of the utility model adjusts dynamic balance, adjusts in the mode of removing quantity, after testing, recess is processed in the position corresponding to unbalance, the dynamic balance of rotor can be realized, compared with prior art, the mode does not need to process hole or slot on rotor, further reduce the noise of motor, and the cost of purchasing dynamic balance auxiliary material is reduced while removing material mode is easy to operate.

Description

Technical Field

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

[0002] To ensure stable rotation of the motor rotor, multiple rotors typically undergo dynamic balancing tests, which involves adjusting the allowable imbalance. Limiting the allowable imbalance within a certain range helps improve bearing life and reduce motor noise. The conventional method for controlling the allowable imbalance is through material feeding, using metal balance blocks, balancing paste, and UV-cured adhesive. However, this material feeding dynamic balancing process is complex, carries the risk of secondary material falling out, and irregularly shaped feeding ports can affect aerodynamic noise and overall fan performance. Furthermore, dynamic balancing materials incur additional costs.

[0003] Therefore, it is urgent to design a rotor, motor, and fan to solve the above problems. Utility Model Content

[0004] One objective of this invention is to provide a rotor that uses a weighing method to balance and adjust the weight of various parts of the rotor. The operation is simple, and no holes or slots need to be machined on the rotor, thereby reducing noise generation.

[0005] Another objective of this invention is to provide a motor in which the weight of the rotor is balanced and adjusted by a method of weight reduction. This method is simple to operate and does not require machining holes or slots on the rotor, thereby reducing motor noise.

[0006] Another objective of this invention is to provide a fan that is easier to adjust for dynamic balance and produces less noise.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] The rotor includes a rotor body and a magnetic component. The rotor body is ring-shaped, and the magnetic component is fixed to the inner side of the rotor body. The magnetic component is used for machining.

[0009] As an alternative, the magnetic component is ring-shaped and is fixed to the inner side of the rotor body by adhesive bonding.

[0010] As an alternative, the magnetic component can be degassed by machining grooves.

[0011] Electric motor, including:

[0012] The aforementioned rotor;

[0013] A base and a bearing housing, wherein the bearing housing is connected to the base and extends axially;

[0014] The stator is sleeved outside the bearing housing, and the rotating shaft of the rotor is rotatably connected to the bearing housing through a bearing assembly.

[0015] As an alternative, the bearing housing has a cylindrical installation space inside and an installation entrance at one end. The other end of the bearing housing has a through-hole with a diameter smaller than the installation space, so as to form a limiting part at the other end of the bearing housing.

[0016] The bearing assembly includes a first bearing, a second bearing, and a stop member. The first bearing is installed into the installation space from the installation inlet and is confined to the limiting part. The second bearing is installed into the installation space from the installation inlet and is spaced apart from the first bearing. The stop member is interference-fitted into the installation space and abuts against the side of the second bearing away from the first bearing.

[0017] The rotating shaft of the rotor is sequentially fitted with the first bearing and the second bearing.

[0018] As an optional solution, the aforementioned base and bearing housing are injection molded in one step.

[0019] As an alternative, the base and the bearing housing mentioned above are made of the same material and are both plastic.

[0020] As an alternative, the inner wall of the bearing housing is provided with a plurality of first protrusions protruding inward. The plurality of first protrusions are arranged at intervals along the inner side of the bearing housing and extend along the axial direction of the bearing housing. The inner wall of the first protrusion is adapted to the circumferential shape of the first bearing and / or the second bearing. The first bearing abuts against the inner wall of the plurality of first protrusions at the same time, and the second bearing abuts against the inner wall of the plurality of first protrusions at the same time.

[0021] As an optional solution, the bearing assembly further includes a spacer, one end of which abuts against the side of the first bearing away from the limiting portion, and the other end of which abuts against the side of the second bearing away from the stop member.

[0022] As an alternative, the stator includes a stator body and a plurality of first protrusions, the stator body being annular; the plurality of first protrusions are arranged at intervals along the inner circumference of the stator body, the bearing housing is inserted between the plurality of first protrusions, the outer circumference of the bearing housing is interference-fitted with the free end of each first protrusion, and the first protrusion is bent and deformed after being inserted into the bearing housing to interference fit with the bearing housing.

[0023] The fan, including the aforementioned motor, has a rotor with a circumferential structure consisting of multiple spaced-apart blades.

[0024] The beneficial effects of this utility model are as follows:

[0025] This utility model provides a rotor that is adjusted by removing material during dynamic balancing. After testing, grooves are machined at the unbalanced positions to achieve dynamic balancing of the rotor. Compared with the prior art, this method does not require machining holes or grooves on the rotor, thereby reducing motor noise. The material removal method is easy to operate and reduces the cost of purchasing dynamic balancing auxiliary materials.

[0026] This utility model also provides an electric motor, which includes the aforementioned rotor, base, bearing housing, and stator. The bearing housing is connected to the base and extends axially; the stator is sleeved outside the bearing housing, and the rotor's rotation shaft is rotatably connected to the bearing housing via a bearing assembly. This motor, by employing the aforementioned rotor, uses a weight-reduction method to balance and adjust the weight of various parts of the rotor, simplifying operation. It eliminates the need for machining holes or slots on the rotor, reducing motor noise.

[0027] This utility model also provides a fan, including the aforementioned motor, wherein the rotor has a circumferential structure consisting of multiple spaced-apart blades. By employing the aforementioned motor, the fan can extend the service life of the bearing housing, reduce fan noise and vibration, and improve customer satisfaction. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the fan provided in an embodiment of the present invention;

[0029] Figure 2 This is a half-sectional view of the fan provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the spacer structure provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the bearing housing provided in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the stator and bearing housing assembly provided in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the stator structure provided in an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the annular deformable component provided in an embodiment of the present invention;

[0035] Figure 8 This is a cross-sectional view of the stator and bearing housing provided in an embodiment of the present invention;

[0036] Figure 9 yes Figure 8 Enlarged view of point A in the middle;

[0037] Figure 10 This is a schematic diagram of the rotor provided in an embodiment of the present invention.

[0038] In the picture:

[0039] 10. Outer shell; 11. Base; 20. Bearing housing; 22. Installation inlet; 23. Limiting part; 24. Through-hole; 25. First protrusion; 26. Receiving groove; 27. Abutting part; 28. Second protrusion;

[0040] 30. Bearing assembly; 31. First bearing; 32. Second bearing; 33. Spacer; 331. Support; 332. First reinforcing part; 333. Second reinforcing part; 334. Through hole; 34. Stop;

[0041] 40. Stator; 41. Stator body; 411. Second protrusion; 42. Annular deformable part; 421. First protrusion; 50. Rotor; 51. Rotating shaft; 52. Fan blade; 53. Spring; 54. Snap ring; 55. Rotor body; 56. Magnetic part; 561. Groove. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0043] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0046] To ensure stable rotation of the motor rotor, multiple rotors typically undergo dynamic balancing tests, which involves adjusting the allowable imbalance. Limiting the allowable imbalance within a certain range helps improve bearing life and reduce motor noise. The conventional method for controlling the allowable imbalance is through material feeding, using metal balance blocks, balancing paste, and UV-cured adhesive. However, this material feeding dynamic balancing process is complex, carries the risk of secondary material falling out, and irregularly shaped feeding ports can affect aerodynamic noise and overall fan performance. Furthermore, dynamic balancing materials incur additional costs.

[0047] To solve the above problems, such as Figure 10 As shown, the rotor 50 includes a rotor body 55 and a magnetic component 56. The rotor body 55 is annular, and the magnetic component 56 is fixed to the inner side of the rotor body 55. The magnetic component 56 is used for machining weight reduction. That is, in this embodiment, the rotor 50 is adjusted for dynamic balance using a weight reduction method. After testing, as shown... Figure 10 As shown, the rotor 50 can be dynamically balanced by machining grooves 561 at the unbalanced position. Compared with the prior art, this method does not require machining holes or grooves on the rotor 50, thereby reducing motor noise. The material removal method is easy to operate, and at the same time, it reduces the cost of purchasing dynamic balancing auxiliary materials.

[0048] Optionally, the magnetic element 56 is ring-shaped and fixed to the rotor body 55 by adhesive bonding. This method is simple and quick. At the same time, the ring-shaped magnetic element 56 ensures that there is a magnetic element 56 at every position on the inner circumference of the rotor body 55, which facilitates the adjustment of dynamic balance at any position on the inner side of the rotor that may be unbalanced.

[0049] This embodiment also provides a motor, such as Figure 1 and Figure 2 As shown, the motor includes the aforementioned rotor 50, base 11, bearing housing 20, and stator 40. The bearing housing 20 is connected to the base 11 and extends axially. The stator 40 is sleeved on the bearing housing 20, and the rotation shaft 51 of the rotor 50 is rotatably connected to the bearing housing via a bearing assembly 30. By employing the aforementioned rotor, the weight of the rotor is balanced and adjusted at various points using a weight-reduction method. This simplifies operation, eliminates the need for machining holes or slots on the rotor, and reduces motor noise.

[0050] like Figure 1 As shown, exemplarily, the motor is used in a fan, that is, the output end of the rotor 50 is constructed with multiple fan blades 52. In other embodiments, the motor rotor 50 may also output rotational kinetic energy in other forms, which are not limited here.

[0051] Optionally, such as Figure 1 and Figure 2 As shown, the bearing housing 20 has a cylindrical installation space inside and an installation entrance 22 at one end. The other end of the bearing housing 20 has a through-hole 24 with a diameter smaller than the installation space, so as to form a limiting part 23 at the other end of the bearing housing 20. The bearing assembly 30 includes a first bearing 31, a second bearing 32 and a stop member 34. The first bearing 31 is installed into the installation space from the installation entrance 22 and is limited to the limiting part 23. The second bearing 32 is installed into the installation space from the installation entrance 22 and is spaced apart from the first bearing 31. The stop member 34 is interference-fitted into the installation space and abuts against the side of the second bearing 32 away from the first bearing 31. The rotating shaft 51 of the rotor 50 passes through the first bearing 31 and the second bearing 32 in sequence.

[0052] With the above configuration, when installing the bearing assembly 30, the first bearing 31 is first installed from the installation inlet 22 into the installation space and abuts against the limiting part 23. Then, the second bearing 32 is installed from the installation inlet 22 into the installation space. Next, the stop 34 is installed into the installation space to limit the second bearing 32. Then, the rotating shaft 51 of the rotor 50 is inserted between the first bearing 31 and the second bearing 32 in sequence. Since the first bearing 31 and the second bearing 32 are installed in the same direction, it is easier to ensure the concentricity of the inner wall of the bearing housing 20 compared with the processing of both ends in the prior art. This ensures the concentricity of the first bearing 31 and the second bearing 32 after installation, and avoids wear on the bearing housing 20 during motor operation. At the same time, because the concentricity of the first bearing 31 and the second bearing 32 is better, the deformation of the rotating shaft 51 is smaller, and the vibration, wear and noise generated by the rotor 50 are all smaller.

[0053] Optionally, see Figure 1 and Figure 2 As shown, a retaining ring 54 is snapped into the bottom of the rotating shaft 51, and a spring 53 abuts between the second bearing 32 and the retaining ring 54, thereby limiting the rotating shaft 51 in the axial direction.

[0054] It should be noted that, as Figure 1 As shown, the base 11 is part of the outer shell 10. The base 11 and the outer wall of the outer shell 10 are connected by a connecting section. The following description will refer to the base 11.

[0055] Optionally, such as Figure 1 and Figure 2As shown, the bearing assembly 30 also includes a spacer 33. One end of the spacer 33 abuts against the side of the first bearing 31 opposite to the limiting part 23, and the other end of the spacer 33 abuts against the side of the second bearing 32 opposite to the stop member 34. Through the above arrangement, the spacer 33 plays the role of limiting the unrestricted side of the first bearing 31 and the second bearing 32. Thus, both sides of the first bearing 31 and both sides of the second bearing 32 are limited. Moreover, during manufacturing, the distance between the first bearing 31 and the second bearing 32 is determined by the length of the spacer 33, resulting in high product consistency.

[0056] Optionally, see also Figure 3 The spacer 33 includes a support portion 331, a first reinforcing portion 332, and a second reinforcing portion 333. The support portion 331 is annular and extends axially. Both ends of the support portion 331 abut against a first bearing 31 and a second bearing 32, respectively. The first reinforcing portion 332 is planar and parallel to the cross-section of the support portion 331, preventing insufficient strength in the middle due to the long length of the support portion 331. At least two second reinforcing portions 333 are provided, radiating outwards from the axis of the support portion 331 and connected to the inner wall of the support portion 331, thus enhancing the overall strength of the spacer 33. In this embodiment, three second reinforcing portions 333 are provided. In other embodiments, the number of second reinforcing portions 333 can be two, four, or more, which is not limited here.

[0057] It should be noted that a through hole 334 is provided in the middle of the spacer 33 to avoid the rotating shaft 51.

[0058] In existing technologies, the base and bearing housing are generally made of two different materials: the base is made of plastic and the bearing housing is made of metal. After the base is formed, the bearing housing is injection molded into a rough shape, and then the semi-finished bearing housing is processed to obtain the desired shape. This method results in a high cost for the bearing housing due to the use of metal materials and the secondary processing after injection molding of the metal bearing housing. At the same time, the use of metal bearing housing will generate microcurrents in the working environment of magnetic fields, and the metal bearing housing is also prone to corrosion after long-term use, which shortens the service life of the bearing housing. In addition, it requires two injection molding processes, which is cumbersome.

[0059] To solve the above problems, the base 11 and bearing housing 20 are injection molded in one step. This design eliminates the need for metal injection molding, significantly reducing costs. Furthermore, it eliminates one injection molding step, improving production efficiency.

[0060] Alternatively, the base 11 and the bearing housing 20 may be made of the same material, both being plastic. Plastic is less expensive and easier to injection mold.

[0061] Optionally, see Figure 2 and Figure 4The bearing housing 20 has several first protrusions 25 protruding inward from its inner sidewall. These first protrusions 25 are spaced apart along the inner side of the bearing housing 20 and extend axially along the bearing housing 20. The inner sidewalls of the first protrusions 25 are adapted to the circumferential shape of the first bearing 31 and / or the second bearing 32. The first bearing 31 abuts against the inner sidewalls of the first protrusions 25, and the second bearing 32 abuts against the inner sidewalls of the first protrusions 25. It is understandable that for a plastic injection-molded bearing housing 20, if it is directly injection-molded into a simple cylindrical shape, the injection molding precision is not high, and secondary finishing cannot be performed after demolding. In this case, when installing the first bearing 31 and the second bearing 32, because the outer side of the bearing is completely fitted with the inner wall of the bearing housing 20, the precision of the inner wall of the bearing housing 20 has a significant impact on the installation position of the bearing, and the installation precision of the two bearings cannot be met. In this embodiment, by setting several first protrusions 25, the contact area between the two bearings and the inner wall of the bearing housing 20 is reduced during installation, thereby reducing the impact of the inner wall of the bearing housing 20 on the bearing installation. Furthermore, since the shape of the first protrusions 25 is small in size, it can be achieved through small-volume injection molding during the injection molding process, thereby ensuring that the side of the first protrusion 25 that contacts the bearing has high precision, so as to achieve the same precision as that of metal materials processed in the prior art.

[0062] Therefore, the motor provided in this embodiment, since the bearing housing 20 is injection molded from a plastic material, does not generate microcurrents and has a longer service life. In addition, the combination of several first protrusions 25 can save the cost of the material itself (without using metal materials) and also achieve the purpose of saving processing costs (no need for precision machining after injection molding like metal bearing housings). It can also achieve the same installation accuracy as the bearing housing 20 made of metal materials.

[0063] Optionally, eight first protrusions 25 are arranged at intervals along the inner sidewall of the bearing housing 20. In other embodiments, the number of first protrusions 25 may be three, four, five, etc., which are not limited here.

[0064] In existing technology, there is a certain gap between the stator and the outer periphery of the bearing housing. In order to fix the stator, glue is filled in the gap. Generally, two-component glue is used. However, during use, the glue is prone to falling off in high temperature and high humidity environments, which can cause the fan to fail. In addition, the investment in two-component glue equipment is expensive.

[0065] To solve the above problems, such as Figure 5 and Figure 6As shown, the stator 40 includes a stator body 41 and a plurality of first protrusions 421. The stator body 41 is annular. The plurality of first protrusions 421 are arranged at intervals along the inner circumference of the stator body 41. The bearing seat 20 is inserted between the plurality of first protrusions 421. The outer circumference of the bearing seat 20 is interference-fitted with the free end of each first protrusion 421. Through the above arrangement, the plurality of first protrusions 421 and the outer circumference of the bearing seat 20 form an interference fit, thereby fixing the bearing seat 20 to the stator 40, avoiding the use of glue, and improving the stability of the stator 40.

[0066] Optionally, such as Figure 6 As shown, the first protrusion 421 is bent and deformed after being inserted into the bearing housing 20 to achieve an interference fit with the bearing housing 20. Before the stator 40 and the bearing housing 20 are installed in place, the first protrusion 421 is flat. As the bearing housing 20 is gradually inserted into place, the first protrusion 421 gradually bends. During this process, a certain internal stress is generated, which can improve the strength of the first protrusion 421. At the same time, the elastic deformation of the first protrusion 421 increases, and the contact force between the first protrusion 421 and the outer wall of the bearing is provided by the elastic force generated by the elastic deformation. The contact force is greater, and the fixation of the stator 40 and the bearing housing 20 is more stable. At the same time, it plays a certain buffering role when vibration occurs.

[0067] Optionally, see Figure 6 and Figure 7 Several first protrusions 421 are formed by annular deformable parts 42, which are integrally molded with the stator body 41 by injection molding. This reduces the manufacturing difficulty of the first protrusions 421.

[0068] Optionally, the annular deformable part 42 is made of metal. Using metal makes the first protrusion 421 more prone to deformation. The use of metal and the abutting shape of the first protrusion 421 reduce the contact area between the first protrusion 421 and the bearing housing 20, effectively regulating the inherent modes of the fan and motor, reducing the transmission of damped vibrations to the outside, effectively blocking the transmission of electromagnetic noise, and reducing the impact of motor noise on the outside environment. Eliminating the need for two-component adhesive fixation simplifies the assembly process, shortens assembly time, reduces equipment investment, and lowers manufacturing costs.

[0069] In this embodiment, before installation, the first protrusion 421 of the annular deformable member 42 is flat. As the bearing seat 20 is installed, the bearing seat 20 bends the flat first protrusion 421, making the first protrusion 421 generally L-shaped. This setting allows the first protrusion 421 to maintain a large elastic deformation after deformation, thereby increasing the abutment force of the first protrusion 421 on the outer periphery of the bearing seat 20, and thus ensuring that the abutment force between the bearing seat 20 and the stator 40 is sufficient.

[0070] In other embodiments, the first protrusion 421 on the annular deformable member 42 can also be directly manufactured as an L-shaped bend, which is not limited here.

[0071] In another embodiment, the stator body 41 and several metal first protrusions 421 can be integrally injection molded, which is not limited here. In this embodiment, the use of the annular deformable member 42 forms a stable connection between several first protrusions 421 through an annular member, which improves the shock resistance and deformation resistance of the first protrusions 421.

[0072] Optionally, see Figures 4-6 The bearing housing 20 has a receiving groove 26 on its outer periphery corresponding to each first protrusion 421, and at least a portion of the first protrusion 421 is received in the corresponding receiving groove 26. Thus, the receiving groove 26 can limit the installation of the stator 40 in the axial direction, and at the same time restrict the relative rotation of the stator 40 in the circumferential direction.

[0073] Optionally, such as Figure 5 and Figure 6 As shown, an abutment portion 27 is formed between two adjacent receiving grooves 26. The inner ring of the stator body 41 also has several second protrusions 411, which are arranged at intervals along the inner circumference of the stator body 41. Each second protrusion 411 elastically abuts against an abutment portion 27. Thus, the first protrusion 421 and the second protrusion 411 together abut against the bearing housing 20, further improving the installation stability of the stator 40 and the bearing housing 20.

[0074] Optionally, such as Figure 4 , Figure 8 and Figure 9 As shown, the bearing housing 20 is also provided with a number of second protrusions 28 on its periphery. The number of second protrusions 28 abut against the inner wall of the stator body 41 and play a role in auxiliary fixing of the stator 40.

[0075] It should be noted that several second protrusions 28 are located at the lower end of the bearing housing 20, while the abutment portion 27 and the receiving groove 26 are located at the upper end of the bearing housing 20. This arrangement will reasonably distribute the structural positions used to fix the stator 40 and make the fixing force of the stator 40 at the upper and lower ends balanced.

[0076] This embodiment also provides a fan, including the aforementioned motor, wherein the rotor 50 has a circumferential structure consisting of a plurality of spaced-apart fan blades 52. By employing the aforementioned motor, the fan can extend the service life of the bearing housing 20, reduce fan noise and vibration, and improve customer satisfaction.

[0077] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A rotor, characterized in that, It includes a rotor body (55) and a magnetic component (56). The rotor body (55) is ring-shaped, and the magnetic component (56) is fixed to the inner side of the rotor body (55). The magnetic component (56) is used for machining.

2. The rotor according to claim 1, characterized in that, The magnetic component (56) is ring-shaped and is fixed to the inner side of the rotor body (55) by adhesive bonding.

3. The rotor according to claim 1, characterized in that, The magnetic component (56) is degassed by machining grooves.

4. An electric motor, characterized in that, include: The rotor as described in any one of claims 1-3; A base (11) and a bearing seat (20), the bearing seat (20) being connected to the base (11) and extending axially; The stator (40) is sleeved on the bearing housing (20), and the rotating shaft (51) of the rotor is rotatably connected to the bearing housing (20) through the bearing assembly (30).

5. The motor according to claim 4, characterized in that, The bearing housing (20) forms a cylindrical installation space inside and an installation entrance (22) is formed at one end. The other end of the bearing housing (20) has a through-hole (24) with a diameter smaller than that of the installation space, so as to form a limiting part (23) at the other end of the bearing housing (20). The bearing assembly (30) includes a first bearing (31), a second bearing (32), and a stop (34). The first bearing (31) is installed into the installation space from the installation inlet (22) and confined in the limiting part (23). The second bearing (32) is installed into the installation space from the installation inlet (22) and spaced apart from the first bearing (31). The stop (34) is interference-fitted into the installation space and abuts against the side of the second bearing (32) away from the first bearing (31). The rotor's rotating shaft (51) is sequentially pierced by the first bearing (31) and the second bearing (32).

6. The motor according to claim 5, characterized in that, The base (11) and the bearing seat (20) are injection molded in one step.

7. The motor according to claim 6, characterized in that, The base (11) and the bearing seat (20) are made of the same material and are both plastic.

8. The motor according to claim 7, characterized in that, The bearing housing (20) has a plurality of first protrusions (25) protruding inward on its inner sidewall. The plurality of first protrusions (25) are arranged at intervals along the inner side of the bearing housing (20). The first protrusions (25) extend along the axial direction of the bearing housing (20). The inner sidewall of the first protrusion (25) is adapted to the circumferential shape of the first bearing (31) and / or the second bearing (32). The first bearing (31) abuts against the inner sidewall of the plurality of first protrusions (25) at the same time, and the second bearing (32) abuts against the inner sidewall of the plurality of first protrusions (25) at the same time.

9. The motor according to claim 5, characterized in that, The bearing assembly (30) further includes a spacer (33), one end of which abuts against the side of the first bearing (31) away from the limiting part (23), and the other end of which abuts against the side of the second bearing (32) away from the stop member (34).

10. The motor according to claim 4, characterized in that, The stator (40) includes a stator body (41) and a plurality of first protrusions (421). The stator body (41) is annular. The plurality of first protrusions (421) are arranged at intervals along the inner circumference of the stator body (41). The bearing seat (20) is inserted between the plurality of first protrusions (421). The outer circumference of the bearing seat (20) is interference-fitted with the free end of each first protrusion (421). After the first protrusion (421) is inserted into the bearing seat (20), it is bent and deformed to interfere with the bearing seat (20).

11. A fan, characterized in that, The motor includes the one described in any one of claims 4-10, wherein the rotor is circumferentially configured as a plurality of spaced-apart fan blades (52).

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