Motor and fan

Abstract

The invention belongs to the technical field of motor manufacturing, and discloses a motor and a fan. The motor comprises a base, a bearing seat, a bearing assembly, a stator and a rotor, the bearing seat extends in the axial direction, a cylindrical installation space is formed in the bearing seat, an installation inlet is formed in one end of the bearing seat, and a penetrating opening with the diameter smaller than that of the installation space is formed in the other end of the bearing seat so that a limiting part can be formed at the other end of the bearing seat; the bearing assembly comprises a first bearing, a second bearing and a stopping piece, the first bearing is installed in the installation space from the installation inlet and limited in the limiting part, the second bearing is installed in the installation space from the installation inlet and is spaced from the first bearing, and the stopping piece is installed in the installation space in an interference mode and abuts against the side, away from the first bearing, of the second bearing; the stator is sleeved on the bearing seat, and a rotating shaft of the rotor penetrates through the first bearing and the second bearing. In the operation process of the motor, as the concentricity of the first bearing and the second bearing is better, the deformation amount of the rotating shaft is smaller, and vibration, abrasion and noise generated by the rotor are all smaller.

Description

Technical Field

[0001] The present invention relates to the technical field of motor manufacturing, and in particular to a motor and a fan. Background Art

[0002] Motors are used in many aspects. Two bearings are installed in the bearing seat inside the motor. The rotating shaft of the rotor is inserted into the two bearings at the same time. The stator is sleeved outside the bearing seat. The rotor is driven to rotate by the change of the magnetic field of the stator. In the existing technology, the two bearings are generally assembled from both sides of the bearing seat. This will make the concentricity of the two bearings poor, cause additional wear to the bearing seat, and affect the life of the bearing. At the same time, for the rotating shaft of the rotor, the concentricity of the two bearings is poor, and the rotating shaft is prone to slight deformation. When the rotor is a fan, it will cause greater vibration, wear and noise from the outside, resulting in a shortened life of the motor and a poor user experience.

[0003] Therefore, it is urgent to design a motor and a fan to solve the above problems. Summary of the Invention

[0004] One object of the present invention is to provide a motor that can improve the concentricity of two bearings, thereby reducing wear on the bearing seat, extending the service life of the bearing seat, and reducing noise.

[0005] Another object of the present invention is to provide a fan that can extend the service life of the bearing seat, reduce the noise and vibration of the fan, and improve customer satisfaction.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Motor, including:

[0008] A base and a bearing seat, wherein the bearing seat is connected to the base, the bearing seat extends axially and forms a cylindrical installation space inside and an installation entrance at one end, and a through-hole with a diameter smaller than that of the installation space is formed at the other end of the bearing seat to form a limit portion at the other end of the bearing seat;

[0009] A bearing assembly comprising a first bearing, a second bearing, and a stopper, wherein the first bearing is installed from the installation entrance into the installation space and is limited by the limit portion, the second bearing is installed from the installation entrance into the installation space and is spaced apart from the first bearing, and the stopper is interference-fitted into the installation space and abuts against a side of the second bearing facing away from the first bearing;

[0010] The stator and the rotor are sleeved on the outside of the bearing seat, and the rotating shaft of the rotor passes through the first bearing and the second bearing in sequence.

[0011] As an optional solution, the bearing assembly further comprises a spacer sleeve, one end of the spacer sleeve abuts against a side of the first bearing away from the limiting portion, and the other end of the spacer sleeve abuts against a side of the second bearing away from the stop member.

[0012] As an optional solution, the inner side wall of the bearing seat is provided with a plurality of first protrusions protruding inwardly, and the plurality of first protrusions are arranged at intervals along the inner side of the bearing seat, and the first protrusions extend axially along the bearing seat. The inner side walls of the first protrusions are adapted to the circumferential shape of the first bearing and / or the second bearing, and the first bearing is simultaneously in contact with the inner side walls of the plurality of first protrusions, and the second bearing is simultaneously in contact with the inner side walls of the plurality of first protrusions.

[0013] As an optional solution, the base and the bearing seat are injection molded in one step.

[0014] As an optional solution, the base and the bearing seat are made of the same material and are both plastic.

[0015] As an optional solution, the stator includes:

[0016] The stator body is annular;

[0017] A plurality of first protrusions are arranged at intervals along the inner circumference of the stator body. The bearing seat is inserted between the first protrusions. The outer circumference of the bearing seat is interference-fitted with the free end of each first protrusion.

[0018] As an optional solution, the first protrusion is bent and deformed after the bearing seat is inserted to achieve an interference fit with the bearing seat.

[0019] As an optional solution, the plurality of first protrusions are formed by an annular deformable member, and the annular deformable member and the stator body are integrally formed by injection molding.

[0020] As an optional solution, the annular deformation member is made of metal.

[0021] As an optional solution, an accommodating groove is provided on the outer periphery of the bearing seat corresponding to each of the first protrusions, and at least a portion of the first protrusion is accommodated in the corresponding accommodating groove.

[0022] As an optional solution, an abutment portion is formed between two adjacent accommodating grooves, and a plurality of second protrusions are also protruded from the inner ring of the stator body. The second protrusions are arranged at intervals along the inner circumference of the stator body, and each of the second protrusions elastically abuts against one of the abutment portions.

[0023] The fan comprises the above-mentioned motor, wherein the circumferential structure of the above-mentioned rotor is a plurality of blades arranged at intervals.

[0024] The beneficial effects of the present invention are:

[0025] The present invention provides a motor. When installing a bearing assembly, the first bearing is first installed from the installation entrance into the installation space and abuts against the limiting portion. Then, the second bearing is installed from the installation entrance into the installation space. After the stopper is installed into the installation space to limit the second bearing, the rotating shaft of the rotor is sequentially inserted between the first bearing and the second bearing. Since the first bearing and the second bearing are installed in the same direction, it is easier to ensure the concentricity of the inner wall of the same installation space than the two-end processing of the prior art for the inner wall of the bearing seat, thereby ensuring the concentricity of the first bearing and the second bearing after installation. During the operation of the motor, the bearing seat is prevented from being worn. At the same time, since the concentricity of the first bearing and the second bearing is better, the deformation of the rotating shaft is smaller, and the vibration, wear and noise generated by the rotor are all smaller.

[0026] The present invention further provides a fan comprising the aforementioned motor, wherein the rotor is circumferentially configured as a plurality of spaced-apart blades. The fan, by employing the aforementioned motor, can extend the service life of the bearing seat, reduce fan noise and vibration, and improve customer satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional view of a fan provided by an embodiment of the present invention;

[0028] Figure 2 is a half-section view of a fan provided by an embodiment of the present invention;

[0029] Figure 3 1 is a schematic structural diagram of a spacer provided in an embodiment of the present invention;

[0030] Figure 4 1 is a structural diagram of a bearing seat provided by an embodiment of the present invention;

[0031] Figure 5 1 is a schematic structural diagram of the stator and bearing seat assembly provided by an embodiment of the present invention;

[0032] Figure 6 1 is a schematic structural diagram of a stator provided in an embodiment of the present invention;

[0033] Figure 7 is a structural schematic diagram of an annular deformable member provided by an embodiment of the present invention;

[0034] Figure 8 is a cross-sectional view of a stator and a bearing seat provided in an embodiment of the present invention;

[0035] Figure 9 yes Figure 8 Enlarged view of point A in the middle;

[0036] Figure 10 Schematic diagram of the structure of the rotor provided by an embodiment of the present invention.

[0037] In the picture:

[0038] 10. Housing; 11. Base; 20. Bearing seat; 22. Installation entrance; 23. Position limiting portion; 24. Insertion opening; 25. First protrusion; 26. Accommodation groove; 27. Abutment portion; 28. Second protrusion;

[0039] 30. Bearing assembly; 31. First bearing; 32. Second bearing; 33. Spacer; 331. Support portion; 332. First reinforcement portion; 333. Second reinforcement portion; 334. Through hole; 34. Stopper;

[0040] 40. Stator; 41. Stator body; 411. Second protrusion; 42. Annular deformation member; 421. First protrusion; 50. Rotor; 51. Rotating shaft; 52. Fan blade; 53. Spring; 54. Retaining spring; 55. Rotor body; 56. Magnetic member; 561. Groove. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0042] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0045] This embodiment provides a motor, such as Figure 1 As shown, exemplarily, the motor is used in a fan, that is, the output end of the rotor 50 is constructed with a plurality of blades 52. In other embodiments, the rotor 50 of the motor can also output rotational kinetic energy in other forms, which are not limited here.

[0046] Among them, see Figure 1 and Figure 2 As shown, the motor includes a base 11, a bearing seat 20, a bearing assembly 30, a stator 40 and a rotor 50. The bearing seat 20 is connected to the base 11. The bearing seat 20 extends axially and forms a cylindrical installation space inside and forms an installation entrance 22 at one end. The other end of the bearing seat 20 opens a through-hole 24 with a diameter smaller than the installation space to form a limiting portion 23 at the other end of the bearing seat 20; the bearing assembly 30 includes a first bearing 31, a second bearing 32 and a stopper 34. The first bearing 31 is installed from the installation entrance 22 into the installation space and is limited to the limiting portion 23. The second bearing 32 is installed from the installation entrance 22 into the installation space and is spaced apart from the first bearing 31. The stopper 34 is interference installed in the installation space and abuts against the side of the second bearing 32 away from the first bearing 31; the stator 40 is sleeved on the outside of the bearing seat 20, and the rotating shaft 51 of the rotor 50 passes through the first bearing 31 and the second bearing 32 in sequence.

[0047] Through the above-mentioned arrangement, when installing the bearing assembly 30, the first bearing 31 is first installed into the installation space from the installation entrance 22 and abuts against the limit portion 23, and then the second bearing 32 is installed into the installation space from the installation entrance 22, and then the stopper 34 is installed into the installation space to limit the second bearing 32, and 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, for the inner wall of the bearing seat 20, compared with the two-end processing of the prior art, it is easier to ensure the concentricity of the inner wall of the same installation space, and then ensure the concentricity of the first bearing 31 and the second bearing 32 after installation, so as to avoid wear of the bearing seat 20 during the operation of the motor. At the same time, since 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.

[0048] Alternatively, see Figure 1 and Figure 2 As shown, a retaining spring 54 is clamped at the bottom of the rotating shaft 51 , and the spring 53 abuts between the second bearing 32 and the retaining spring 54 , thereby limiting the rotating shaft 51 in the axial direction.

[0049] It should be noted that if Figure 1 As shown, the base 11 is a part of the housing 10 , and the base 11 is connected to the outer wall of the housing 10 via a connecting section. The following description will refer to the base 11 .

[0050] Alternatively, as Figure 1 and Figure 2 As shown, the bearing assembly 30 further includes a spacer sleeve 33, one end of which abuts the side of the first bearing 31 facing away from the limiting portion 23, and the other end of the spacer sleeve 33 abuts the side of the second bearing 32 facing away from the stopper 34. Through this arrangement, the spacer sleeve 33 acts as an unrestricted lateral limiter for the first bearing 31 and the second bearing 32. As a result, both sides of the first bearing 31 and both sides of the second bearing 32 are limited. During manufacturing, the spacing between the first bearing 31 and the second bearing 32 is determined by the length of the spacer sleeve 33, resulting in high product consistency.

[0051] Optionally, see also Figure 3 The spacer 33 includes a support portion 331, a first reinforcement portion 332, and a second reinforcement portion 333. The support portion 331 is annular and extends axially. The two ends of the support portion 331 abut the first bearing 31 and the second bearing 32, respectively. The first reinforcement portion 332 is flat and parallel to the cross-section of the support portion 331 to prevent the support portion 331 from being too long and lacking strength in the middle. At the same time, at least two second reinforcement portions 333 are provided. The at least two second reinforcement portions 333 are arranged divergently around the axis of the support portion 331 and are connected to the inner wall of the support portion 331, which can also enhance the overall strength of the spacer 33. In this embodiment, three second reinforcement portions 333 are provided. In other embodiments, the number of second reinforcement portions 333 can also be two, four, or more, which is not limited here.

[0052] It should be noted that a through hole 334 is defined in the middle of the spacer 33 to allow the rotating shaft 51 to pass through.

[0053] In the prior art, the base and the bearing seat are generally made of two materials, the base is plastic and the bearing seat is metal. After the base is formed, the bearing seat is injection molded into a rough shape, and then the semi-finished bearing seat is processed to obtain the required shape of the bearing seat. In this method, due to the use of metal material and the secondary processing of the metal bearing seat after injection molding, the cost of the bearing seat is relatively high. At the same time, the use of a metal bearing seat will generate microcurrent in a working environment of a magnetic field. The metal bearing seat is also prone to corrosion after long-term use, which shortens the service life of the bearing seat and requires two injection moldings, which is cumbersome to operate.

[0054] In order to solve the above problem, the base 11 and the bearing seat 20 are injection molded in one step. Through the above arrangement, metal injection molding is omitted, which greatly saves the investment of cost. At the same time, the injection molding step is also reduced by one step, thereby improving production efficiency.

[0055] Optionally, the base 11 and the bearing seat 20 are made of the same material, namely plastic, which has a low cost and is convenient for injection molding.

[0056] Alternatively, see Figure 2 and Figure 4 The inner sidewall of the bearing seat 20 is provided with a plurality of first protrusions 25 projecting inward. The plurality of first protrusions 25 are arranged at intervals along the inner side of the bearing seat 20. The first protrusions 25 extend axially along the bearing seat 20. The inner sidewalls of the first protrusions 25 conform to the circumferential shape of the first bearing 31 and / or the second bearing 32. The first bearing 31 simultaneously abuts against the inner sidewalls of the plurality of first protrusions 25, and the second bearing 32 simultaneously abuts against the inner sidewalls of the plurality of first protrusions 25. It is understood that for a bearing seat 20 formed by plastic injection molding, such as a bearing seat 20 directly molded into a simple cylindrical shape, the injection molding precision is not high and secondary finishing is not possible after demolding. When the first bearing 31 and the second bearing 32 are installed, the outer sides of the bearings completely fit against the inner wall of the bearing seat 20. As a result, the precision of the inner wall of the bearing seat 20 significantly affects the installation position of the bearings, and the installation precision of the two bearings cannot be met. In this embodiment, a plurality of first protrusions 25 are provided to reduce the contact area between the two bearings and the inner wall of the bearing seat 20 when the two bearings are installed, thereby reducing the influence of the inner wall of the bearing seat 20 on the installation of the bearings. In addition, due to the small size of the shape of the first protrusion 25, small-volume injection molding can be used during the injection molding process, thereby ensuring that the side of the first protrusion 25 in contact with the bearing has a high precision, thereby achieving the same precision as that of metal materials processed in the prior art.

[0057] Therefore, the motor provided in this embodiment does not generate microcurrents and has a longer service life because the bearing seat 20 is injection molded from a plastic material. In addition, combined with the arrangement of several first protrusions 25, it can save the cost of the material itself (no metal material is used) and save processing costs (no need for fine processing after injection molding like a metal bearing seat), and can achieve the same installation accuracy as a bearing seat 20 made of metal.

[0058] Optionally, eight first protrusions 25 are arranged at intervals along the inner wall of the bearing seat 20. In other embodiments, the number of the first protrusions 25 can also be three, four, five, etc., which is not limited here.

[0059] In the existing technology, there is a certain gap between the stator and the outer periphery of the bearing seat. In order to fix the stator, glue is filled in the gap. Generally, two-component glue is used. However, during use, the glue is easy to fall off in a high temperature and high humidity environment, causing the fan to fail, and the investment in two-component glue equipment is expensive.

[0060] In order to solve the above problems, Figure 5 and Figure 6 As shown, the stator 40 includes a stator body 41 and several first protrusions 421. The stator body 41 is annular. The first protrusions 421 are spaced apart along the inner circumference of the stator body 41. The bearing seat 20 is inserted between the first protrusions 421. The outer circumference of the bearing seat 20 and the free end of each first protrusion 421 have an interference fit. This arrangement creates an interference fit between the first protrusions 421 and the outer circumference of the bearing seat 20, securing the bearing seat 20 to the stator 40. This avoids the use of glue and improves the stability of the stator 40.

[0061] Alternatively, as Figure 6 As shown, the first protrusion 421 is bent and deformed after the bearing seat 20 is inserted into place to form an interference fit with the bearing seat 20. Before the stator 40 and the bearing seat 20 are installed in place, the first protrusion 421 is flat. As the bearing seat 20 is gradually inserted into place, the first protrusion 421 gradually bends. During this process, a certain amount of 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. The abutment 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 abutment force is greater, and the fixation of the stator 40 and the bearing seat 20 is more stable. At the same time, it plays a certain buffering role in the event of vibration.

[0062] Alternatively, see Figure 6 and Figure 7 The plurality of first protrusions 421 are formed by the annular deformable member 42 , and the annular deformable member 42 and the stator body 41 are integrally formed by injection molding.

[0063] Optionally, the annular deformable member 42 is made of metal. Using metal makes the first protrusion 421 more susceptible to deformation. The use of metal and the abutment configuration of the first protrusion 421 reduce the contact area between the first protrusion 421 and the bearing seat 20, effectively adjusting the natural modes of the fan and motor, reducing the transmission of damped vibration to the outside world, effectively blocking the transmission of electromagnetic noise, and reducing the impact of motor noise on the outside world. Eliminating the need for two-component glue simplifies the assembly process, shortens assembly time, reduces equipment investment, and lowers manufacturing costs.

[0064] In this embodiment, before the annular deformable member 42 is installed, the first protrusion 421 is in the shape of a flat plate. As the bearing seat 20 is installed in place, the bearing seat 20 bends the first protrusion 421 of the flat plate so that the first protrusion 421 is roughly L-shaped. This arrangement allows the first protrusion 421 to still 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, thereby ensuring that the abutment force between the bearing seat 20 and the stator 40 is sufficient.

[0065] In other embodiments, the first protrusion 421 on the annular deformation member 42 may also be directly manufactured into an L-shaped bending shape, which is not limited here.

[0066] In another embodiment, the stator body 41 and the plurality of metal first protrusions 421 may be integrally injection molded, which is not a limitation here. In this embodiment, the use of the annular deformable member 42 securely connects the plurality of first protrusions 421 via a single annular member, thereby improving the first protrusions' 421's resistance to shock and deformation.

[0067] Alternatively, see Figure 4-Figure 6 The outer circumference of the bearing seat 20 is provided with a receiving groove 26 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 limit the relative rotation of the stator 40 in the circumferential direction.

[0068] Alternatively, as Figure 5 and Figure 6 As shown, an abutment portion 27 is formed between two adjacent accommodating grooves 26. The inner ring of the stator body 41 is further provided with a plurality of second protrusions 411. The second protrusions 411 are arranged at intervals along the inner circumference of the stator body 41, and each second protrusion 411 elastically abuts against an abutment portion 27. Thus, the first protrusion 421 and the second protrusion 411 abut against the bearing seat 20, further improving the installation stability of the stator 40 and the bearing seat 20.

[0069] Alternatively, as Figure 4 、 Figure 8 and Figure 9 As shown, a plurality of second protrusions 28 are further provided on the peripheral side of the bearing seat 20 . The plurality of second protrusions 28 abut against the inner side wall of the stator body 41 to assist in fixing the stator 40 .

[0070] It should be noted that several second protrusions 28 are located at the lower end of the bearing seat 20, while the abutment portion 27 and the accommodating groove 26 are located at the upper end of the bearing seat 20. This arrangement will reasonably distribute the structural positions for fixing the stator 40 and balance the fixing forces of the stator 40 at the upper and lower ends.

[0071] To ensure stable rotation of the rotor 50, multiple rotors 50 are typically subjected to dynamic balancing tests. This involves adjusting the allowable unbalance. Limiting the allowable unbalance of the rotor 50 to a certain range helps improve bearing life and reduce motor noise. Conventional methods for controlling allowable unbalance involve adding materials, such as metal balancing blocks, balancing mud, and UV curing adhesive. The dynamic balancing process is complex, and the added materials carry the risk of secondary dropout. Irregularly shaped feed ports can affect aerodynamic noise and overall fan performance. Furthermore, the cost of dynamic balancing materials is significant.

[0072] In order to solve the above problems, Figure 10 As shown, the rotor 50 includes a rotor body 55 and a magnetic member 56. The rotor body 55 is annular. The magnetic member 56 is fixed to the inner side of the rotor body 55. The magnetic member 56 is used for processing and removing weight. That is, when adjusting the dynamic balance of the rotor 50 of this embodiment, the weight removal method is used. After testing, as shown in FIG. Figure 10 As shown, by machining grooves 561 corresponding to the unbalanced positions, dynamic balancing of the rotor 50 can be achieved. Compared with the prior art, this method does not require machining holes or grooves on the rotor 50, thereby reducing the noise of the motor. The material removal method is easy to operate and, at the same time, reduces the cost of purchasing dynamic balancing auxiliary materials.

[0073] Optionally, the magnetic member 56 and the rotor body 55 are fixed by bonding, which is simple and fast.

[0074] This embodiment also provides a fan, including the above-mentioned motor, wherein the rotor 50 is circumferentially structured as a plurality of spaced blades 52. By adopting the above-mentioned motor, the fan can extend the service life of the bearing seat 20, reduce the noise and vibration of the fan, and improve customer satisfaction.

[0075] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A motor, characterized in that include: A base (11) and a bearing seat (20), wherein the bearing seat (20) is connected to the base (11), the bearing seat (20) extends axially and forms a cylindrical installation space inside and forms an installation entrance (22) at one end, and the other end of the bearing seat (20) is provided with a through opening (24) having a diameter smaller than that of the installation space, so as to form a limiting portion (23) at the other end of the bearing seat (20); A bearing assembly (30) comprises a first bearing (31), a second bearing (32) and a stopper (34), wherein the first bearing (31) is installed into the installation space from the installation entrance (22) and is limited to the limiting portion (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), and the stopper (34) is installed in the installation space with an interference fit and abuts against a side of the second bearing (32) facing away from the first bearing (31); A stator (40) and a rotor (50), wherein the stator (40) is sleeved outside the bearing seat (20), and the rotating shaft (51) of the rotor (50) passes through the first bearing (31) and the second bearing (32) in sequence.

2. The motor according to claim 1, characterized in that The bearing assembly (30) further includes a spacer sleeve (33), one end of the spacer sleeve (33) abuts against a side of the first bearing (31) facing away from the limiting portion (23), and the other end of the spacer sleeve (33) abuts against a side of the second bearing (32) facing away from the stopper (34).

3. The motor according to claim 1, characterized in that The inner side wall of the bearing seat (20) is provided with a plurality of first protrusions (25) protruding inwardly, and the plurality of first protrusions (25) are arranged at intervals along the inner side of the bearing seat (20). The first protrusions (25) extend along the axial direction of the bearing seat (20). The inner side wall 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) is simultaneously in contact with the inner side walls of the plurality of first protrusions (25), and the second bearing (32) is simultaneously in contact with the inner side walls of the plurality of first protrusions (25).

4. The motor according to any one of claims 1 to 3, characterized in that: The base (11) and the bearing seat (20) are injection molded in one step.

5. The motor according to claim 4, characterized in that The base (11) and the bearing seat (20) are made of the same material, both plastic.

6. The motor according to any one of claims 1 to 3, characterized in that: The stator (40) comprises: The stator body (41) is annular; A 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); and the outer circumference of the bearing seat (20) is interference-fitted with the free end of each first protrusion (421).

7. The motor according to claim 6, characterized in that After being inserted into the bearing seat (20), the first protrusion (421) is bent and deformed to achieve an interference fit with the bearing seat (20).

8. The motor according to claim 7, characterized in that A plurality of the first protrusions (421) are formed by an annular deformable member (42), and the annular deformable member (42) and the stator body (41) are integrally formed by injection molding.

9. The motor according to claim 8, characterized in that The material of the annular deformation member (42) is metal.

10. The motor according to claim 6, characterized in that An accommodating groove (26) is provided on the outer periphery of the bearing seat (20) corresponding to each first protrusion (421), and at least a portion of the first protrusion (421) is accommodated in the corresponding accommodating groove (26).

11. The motor according to claim 10, characterized in that An abutment portion (27) is formed between two adjacent accommodating grooves (26), and a plurality of second protrusions (411) are protruded from the inner ring of the stator body (41). The second protrusions (411) are arranged at intervals along the inner circumference of the stator body (41), and each second protrusion (411) elastically abuts against one of the abutment portions (27).

12. A fan, characterized in that The motor comprises the motor according to any one of claims 1 to 11, wherein the circumferential structure of the rotor (50) is a plurality of blades (52) arranged at intervals.

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