Stator assembly and motor with same

Abstract

The utility model discloses a stator assembly and a motor having the same, the stator assembly is an integrated member and comprises a housing having a mounting hole; the stator assembly is embedded in the shell and is arranged around the mounting hole; and the bearing mounting seat is arranged in the mounting hole, and the bearing mounting seat is an iron-based powder metallurgy component. According to the stator assembly provided by the utility model, the stator assembly is an integrated piece and comprises the shell, the stator assembly and the bearing mounting seat, and the bearing mounting seat is an iron-based powder metallurgy piece, so that the thermal expansion coefficient of the bearing mounting seat is closer to the thermal expansion coefficient of a bearing, and the bearing mounting seat can be heated when the stator assembly works and emits heat; the change of the matching state of the bearing and the bearing mounting seat is reduced, the problem of wriggling of the bearing outer ring caused by the bearing mounting seat in the operation process is solved, the situation that the stator assembly makes abnormal noise is reduced, the reliability and stability of the stator assembly are improved, and the service life of the stator assembly is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a stator assembly and a motor having the same. Background Art

[0002] In the related art, during the operation of an outer-rotor motor, the bearing seat is prone to cause the outer ring of the bearing to creep, resulting in abnormal noise in the outer-rotor motor and reducing the service life of the outer-rotor motor. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a stator assembly, which can solve the problem of the outer ring creep of the bearing, reduce the occurrence of abnormal noise in the stator assembly, improve the reliability and stability of the stator assembly, and extend the service life of the stator assembly.

[0004] The utility model also provides a motor, which includes the above-mentioned stator assembly.

[0005] The stator assembly according to the embodiment of the utility model is an integral part and includes: a housing having a mounting hole; a stator assembly embedded in the housing and disposed around the mounting hole; and a bearing mounting seat disposed in the mounting hole, the bearing mounting seat being a ferrous powder metallurgy part.

[0006] For the stator assembly according to the embodiment of the utility model, since the stator assembly is an integral part and includes a housing, a stator assembly and a bearing mounting seat, the housing has a mounting hole, the stator assembly is embedded in the housing and disposed around the mounting hole, the bearing mounting seat is disposed in the mounting hole, and the bearing mounting seat is a ferrous powder metallurgy part, it can make the thermal expansion coefficient of the bearing mounting seat closer to that of the bearing, and can reduce the change in the mating state between the bearing and the bearing mounting seat when the stator assembly works and generates heat, solve the problem of the outer ring creep of the bearing caused by the bearing mounting seat during the operation process, reduce the occurrence of abnormal noise in the stator assembly, improve the reliability and stability of the stator assembly, and extend the service life of the stator assembly.

[0007] In addition, the stator assembly according to the utility model may further have the following additional technical features:

[0008] In some embodiments, the housing, the stator assembly and the bearing mounting seat are formed as an integral part by an injection molding process.

[0009] In some embodiments, a positioning boss extending in the circumferential direction of the bearing mounting seat is provided on the outer peripheral wall of the bearing mounting seat, and a positioning groove cooperating with the positioning boss is provided on the inner wall of the mounting hole.

[0010] In some embodiments, along the axial direction of the mounting hole, at least one side of the two opposite sides of the housing located relative to the positioning groove is provided with a positioning hole. The positioning hole is located radially outside the mounting hole, and the positioning hole extends along the axial direction of the mounting hole and penetrates the side wall of the positioning groove.

[0011] In some embodiments, the positioning boss extends circumferentially along the bearing mounting seat to form a ring. Along the axial direction of the mounting hole, the positioning holes located on the same side of the positioning groove are multiple and are arranged at intervals in the circumferential direction of the positioning boss.

[0012] In some embodiments, the positioning boss extends circumferentially along the bearing mounting seat to form a ring. Along the axial direction of the mounting hole, the positioning holes located on the same side of the positioning groove are multiple. The multiple positioning holes are divided into multiple positioning hole groups arranged at intervals in the radial direction of the positioning boss. Each positioning hole group includes multiple positioning holes arranged at intervals in the circumferential direction of the positioning boss. Along the circumferential direction of the positioning boss, the positioning holes of two adjacent positioning hole groups are staggered.

[0013] In some embodiments, the diameter of the positioning hole is a, and it satisfies: 1mm ≤ a ≤ 4mm.

[0014] In some embodiments, along the radial direction of the positioning boss, the minimum distance between the positioning hole and the outer peripheral wall of the bearing mounting seat is b, and it satisfies: 0.5mm ≤ b ≤ 2mm.

[0015] In some embodiments, the housing completely covers the stator assembly.

[0016] The present utility model also provides a motor having the above embodiments.

[0017] According to the motor of the embodiment of the present utility model, by providing the above-mentioned stator assembly, the stator assembly is an integral part and includes a housing, a stator assembly, and a bearing mounting seat. The housing has a mounting hole. The stator assembly is embedded in the housing and is arranged around the mounting hole. The bearing mounting seat is arranged in the mounting hole. The bearing mounting seat is a ferrous powder metallurgy part, which can make the thermal expansion coefficient of the bearing mounting seat closer to the thermal expansion coefficient of the bearing. When the stator assembly works and generates heat, it can reduce the change in the matching state between the bearing and the bearing mounting seat, solve the problem of the outer ring creep of the bearing caused by the bearing mounting seat during operation, reduce the situation of abnormal noise generated by the stator assembly, improve the reliability and stability of the stator assembly, and extend the service life of the stator assembly.

[0018] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 FIG. is an exploded view of a stator assembly according to an embodiment of the present utility model;

[0021] Figure 2 FIG. is a perspective view of a stator assembly according to a first embodiment of the present utility model;

[0022] Figure 3 FIG. is a top view of a stator assembly according to a first embodiment of the present utility model;

[0023] Figure 4 FIG. is a top view of a stator assembly according to a second embodiment of the present utility model;

[0024] Figure 5 FIG. is a top view of a stator assembly according to a third embodiment of the present utility model.

[0025] REFERENCE SIGNS:

[0026] 100, stator assembly;

[0027] 1, housing; 11, mounting hole; 12, positioning hole group; 121, positioning hole;

[0028] 2, stator assembly;

[0029] 3, bearing mounting seat; 31, positioning boss; 32, bearing cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0031] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0033] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] The stator assembly 100 according to an embodiment of the present utility model will be described below with reference to the drawings.

[0035] As Figure 1 and Figure 2 shown, the stator assembly 100 according to an embodiment of the present utility model is an integral part, which can effectively suppress the generation of vibration, reduce the noise during the operation of the stator assembly 100, and the stator assembly 100 includes a housing 1, a stator assembly 2 and a bearing mount 3.

[0036] Specifically, referring to the attached Figure 1As shown, the housing 1 has a mounting hole 11. The stator assembly 2 is embedded in the housing 1 and arranged around the mounting hole 11. The bearing mounting seat 3 is arranged in the mounting hole 11. The bearing mounting seat 3 defines a bearing cavity 32 which can accommodate a bearing to meet the requirement for placing the bearing. Thus, the bearing can be placed through the bearing mounting seat 3, avoiding separately machining the bearing cavity 32 on the stator assembly 100 subsequently, which is beneficial to reducing the manufacturing difficulty of the stator assembly 100 and improving the production and processing efficiency of the stator assembly 100. Optionally, one bearing can be placed in the bearing cavity 32 to meet the requirement for placing the bearing. The bearing cavity 32 can also include two chambers which are arranged along the axial direction of the bearing mounting seat 3 (refer to the f direction shown in the appendix Figure 1 and communicated with each other, facilitating other structures (such as the main shaft of the rotor, etc.) to pass through the bearing cavity 32.

[0037] Furthermore, the bearing mounting seat 3 is a ferrous powder metallurgy part. The ferrous powder metallurgy part is a structural part mainly made of iron powder or alloy steel powder through powder metallurgy process, which has good mechanical properties, wear resistance and machining properties, and is heat-resistant and corrosion-resistant. It can be understood that in the prior art, the bearing mounting seat is usually made of cast aluminum material and the bearing is made of bearing steel. However, the bearing mounting seat 3 of the present utility model is a ferrous powder metallurgy part, making the thermal expansion coefficient of the bearing mounting seat 3 closer to that of the bearing. When the stator assembly 100 works and generates heat, it can reduce the change of the matching state between the bearing and the bearing mounting seat 3, solve the problem of the outer ring creep of the bearing caused by the bearing mounting seat 3 during the operation process, reduce the situation of abnormal noise generated by the stator assembly 100, improve the reliability and stability of the stator assembly 100, and extend the service life of the stator assembly 100.

[0038] It should be noted that the ferrous powder metallurgy process mainly includes steps such as raw material preparation, powder making, molding and sintering. Through powder making, the powder raw materials are processed into powders with the required particle size. Then, through the molding process, the powders are compressed into the required shape in a mold. Finally, through sintering, sintering reaction occurs between the powder particles in a high-temperature environment to form a dense new material.

[0039] It should be noted that the ferrous powder metallurgy part is mainly composed of three components: iron, copper and carbon. The proportion of iron in the ferrous powder metallurgy part is c, the proportion of copper is d, and the proportion of carbon is e. c + d + e ≥ 99%, 1% ≤ d ≤ 5%, 0.2% ≤ e ≤ 1%.

[0040] According to the stator assembly 100 of the embodiment of the present utility model, since the stator assembly 100 is an integral part and includes a housing 1, a stator assembly 2, and a bearing mounting seat 3, the housing 1 has a mounting hole 11, the stator assembly 2 is embedded in the housing 1 and disposed around the mounting hole 11, the bearing mounting seat 3 is disposed in the mounting hole 11, and the bearing mounting seat 3 is an iron-based powder metallurgy part, which can make the thermal expansion coefficient of the bearing mounting seat 3 closer to that of the bearing. When the stator assembly 100 operates and generates heat, it can reduce the change in the mating state between the bearing and the bearing mounting seat 3, solve the problem of the outer ring creep of the bearing caused by the bearing mounting seat 3 during the operation process, reduce the situation of abnormal noise generated by the stator assembly 100, improve the reliability and stability of the stator assembly 100, and extend the service life of the stator assembly 100.

[0041] In some embodiments of the present utility model, the housing 1, the stator assembly 2, and the bearing mounting seat 3 are formed into an integral part by an injection molding process. The housing 1 is an injection molded part, which can make the stator assembly 100 form a plastic encapsulated stator assembly 100, be beneficial to improving the structural strength of the stator assembly 100, reducing the noise during the operation of the stator assembly 100, and the stator assembly 100 is injection molded as a whole, effectively suppressing the generation of vibration, and having good characteristics such as corrosion resistance, moisture resistance, and high temperature resistance.

[0042] In some embodiments of the present utility model, refer to the attached Figure 1 As shown, a positioning boss 31 extending along the circumferential direction of the bearing mounting seat 3 is provided on the outer peripheral wall of the bearing mounting seat 3. The positioning boss 31 and the stator assembly 2 are arranged in the axial direction of the bearing mounting seat 3, so that the positioning boss 31 can play a positioning role on the stator assembly 2, avoid the stator assembly 2 from moving along the axial direction of the bearing mounting seat 3, ensure reliable positioning, facilitate subsequent processing of the stator assembly 2, be beneficial to improving the production qualification rate of the stator assembly 100, reducing the production cost of the stator assembly 100. A positioning groove cooperating with the positioning boss 31 is provided on the inner wall of the mounting hole 11. Through the cooperation of the positioning boss 31 and the positioning groove, the relative position of the bearing mounting seat 3 and the housing 1 in the axial direction of the bearing mounting seat 3 can be guaranteed, avoid the bearing mounting seat 3 from shifting along the axial direction, ensure the reliability and stability of the bearing mounting seat 3, and further ensure the reliability of the stator assembly 100.

[0043] In a further embodiment of the present utility model, refer to the attached Figure 1 As shown, along the axial direction of the mounting hole 11 (refer to the attached Figure 1In the f direction shown, at least one side of the housing 1 on the two opposite sides of the positioning groove is provided with a positioning hole 121. The positioning hole 121 is located radially outside the mounting hole 11 and is arranged opposite to the positioning boss 31. The positioning hole 121 extends along the axial direction of the mounting hole 11 and penetrates through the side wall of the positioning groove. By positioning at the positioning hole 121, the accurate positioning of the bearing mount 3 can be ensured, avoiding the position change problem caused by the movement of the bearing mount 3 during injection molding, thereby ensuring the accurate positioning of the stator assembly 2, facilitating the integral injection molding of the housing 1, the stator assembly 2, and the bearing mount 3, ensuring the reliable processing of the stator assembly 100, and being beneficial to improving the production qualification rate of the stator assembly 100.

[0044] It can be understood that during the production and processing of the stator assembly 100, first, the bearing mount 3 is placed into the mold, and the positioning boss 31 is abutted against the ejector pin in the mold to achieve the positioning of the bearing mount 3. Then, the stator assembly 2 is placed into the mold and placed around the bearing mount 3. Finally, injection molding is performed in the mold to form the housing 1, making the stator assembly 100 an integral body. The existence of the positioning hole 121 is due to the existence of the ejector pin and is naturally formed during the injection molding process.

[0045] Optionally, along the axial direction of the mounting hole 11, it can be that only one side of the housing 1 on the two opposite sides of the positioning groove is provided with a positioning hole 121, that is to say, there is only an ejector pin on one side of the positioning boss 31 along the axial direction of the mounting hole 11 in the mold; or it can be that both sides of the housing 1 on the two opposite sides of the positioning groove are provided with positioning holes 121, that is to say, there are ejector pins on both sides of the positioning boss 31 along the axial direction of the mounting hole 11 in the mold. By simultaneously positioning and pressing the positioning boss 31 with the ejector pins on both sides of the positioning boss 31 along the axial direction of the mounting hole 11, the positioning effect of the bearing mount 3 can be further ensured, effectively avoiding the movement of the stator assembly 2 during the processing, ensuring the production and processing of the stator assembly 100, and being beneficial to improving the production efficiency of the stator assembly 100.

[0046] In a further embodiment of the present invention, refer to the attached Figure 1 As shown, the positioning boss 31 extends circumferentially along the bearing mount 3 into a ring shape. Along the axial direction of the mounting hole 11, the positioning holes 121 on the same side of the positioning groove are a plurality of spaced apart along the circumferential direction of the positioning boss 31. Through the plurality of positioning holes 121, different positions of the positioning boss 31 can be positioned, ensuring the accurate positioning of the bearing mount 3, facilitating the processing of the stator assembly 2, ensuring the reliable processing of the stator assembly 100, and being beneficial to improving the production qualification rate of the stator assembly 100.

[0047] For example, the positioning holes 121 on the same side of the positioning groove can be two, three, five, eight, ten, or twelve that are arranged at intervals along the circumferential direction of the positioning boss 31. Optionally, the multiple positioning holes 121 are evenly or unevenly spaced in the circumferential direction of the positioning boss 31 to meet different manufacturing requirements. For example, as Figure 2 shown, the twelve positioning holes 121 on the same side of the positioning groove are arranged at intervals along the circumferential direction of the positioning boss 31.

[0048] In a further embodiment of the present utility model, referring to the attached Figure 4 and the attached Figure 5 shown, in combination with referring to Figure 1 , the positioning boss 31 extends in a ring shape along the circumferential direction of the bearing mounting seat 3. Along the axial direction of the mounting hole 11, there are multiple positioning holes 121 on the same side of the positioning groove. The multiple positioning holes 121 are divided into multiple positioning hole groups 12 that are arranged at intervals in the radial direction of the positioning boss 31. Each positioning hole group 12 includes multiple positioning holes 121 that are arranged at intervals along the circumferential direction of the positioning boss 31. Along the circumferential direction of the positioning boss 31, the positioning holes 121 of two adjacent positioning hole groups 12 are staggered. Through the multiple positioning holes 121 of the multiple positioning hole groups 12, different positions of the positioning boss 31 can be positioned, the positioning effect of the positioning holes 121 in the radial direction of the positioning boss 31 can be expanded, the positioning of the bearing mounting seat 3 can be ensured to be accurate, the processing of the stator assembly 2 is facilitated, the processing reliability of the stator assembly 100 is guaranteed, and it is beneficial to improve the production qualification rate of the stator assembly 100.

[0049] For example, referring to the attached Figure 4 shown, along the axial direction of the mounting hole 11, there are twelve positioning holes 121 on the same side of the positioning groove. The twelve positioning holes 121 are divided into two positioning hole groups 12 that are arranged at intervals in the radial direction of the positioning boss 31. Each positioning hole group 12 includes six positioning holes 121 that are arranged at intervals along the axial direction of the positioning boss 31 (the f direction shown in the attached Figure 1 ). The six positioning holes 121 of each positioning hole group 12 are evenly spaced in the circumferential direction of the positioning boss 31; referring to the attached Figure 5 shown, along the axial direction of the mounting hole 11, there are eight positioning holes 121 on the same side of the positioning groove. The eight positioning holes 121 are divided into two positioning hole groups 12 that are arranged at intervals in the radial direction of the positioning boss 31. Each positioning hole group 12 includes four positioning holes 121 that are arranged at intervals along the axial direction of the positioning boss 31. The four positioning holes 121 of each positioning hole group 12 are unevenly spaced in the circumferential direction of the positioning boss 31.

[0050] In a further embodiment of the present utility model, referring to the attached Figure 3As shown, the diameter of the positioning hole 121 is a, and it satisfies: 1mm ≤ a ≤ 4mm. That is to say, the diameter of the ejector pin is 1mm - 4mm, which can avoid the ejector pin being easily bent due to being too thin and avoid die interference caused by the ejector pin being too thick, thus affecting the normal production and processing of the stator assembly 100. For example, the diameter a of the positioning hole 121 can be 1mm, 2mm, 3mm or 4mm.

[0051] In a further embodiment of the present utility model, referring to the attached Figure 3 As shown, along the radial direction of the positioning boss 31, the minimum distance between the positioning hole 121 and the outer peripheral wall of the bearing mounting seat 3 is b, and it satisfies: 0.5mm ≤ b ≤ 2mm, which can avoid mutual interference between the die and the bearing mounting seat 3, avoid the ejector pin from being bent, and ensure the reliability and stability of the housing 1, and avoid the thickness of the housing 1 at this position being too thin due to the distance between the positioning hole 121 and the outer peripheral wall of the bearing mounting seat 3 being too close, thus causing the housing 1 to be easily cracked or detached. For example, along the radial direction of the positioning boss 31, the minimum distance b between the positioning hole 121 and the outer peripheral wall of the bearing mounting seat 3 can be 0.5mm, 1mm, 1.5mm or 2mm.

[0052] In some embodiments of the present utility model, referring to the attached Figure 1 As shown, the housing 1 completely covers the stator assembly 2, which can ensure that the housing 1 plays a protective role for the stator assembly 2, is beneficial to improving the structural strength of the stator assembly 100, and reducing the noise during the operation of the stator assembly 100.

[0053] The present utility model also proposes a motor having the stator assembly 100 of the above embodiments.

[0054] As Figure 1 shown, the motor according to the embodiment of the present utility model includes the above-mentioned stator assembly 100.

[0055] It should be noted that the motor can be an inner stator and outer rotor motor, but not limited thereto. In some embodiments, the motor can be applied to household appliances, etc., to meet the user's usage requirements.

[0056] According to the motor of the embodiment of the present utility model, by providing the above-mentioned stator assembly 100, the stator assembly 100 is an integral part and includes a housing 1, a stator assembly 2 and a bearing mounting seat 3. The housing 1 has a mounting hole 11. The stator assembly 2 is embedded in the housing 1 and is arranged around the mounting hole 11. The bearing mounting seat 3 is arranged in the mounting hole 11. The bearing mounting seat 3 is a ferrous powder metallurgy part, which can make the thermal expansion coefficient of the bearing mounting seat 3 closer to that of the bearing. When the stator assembly 100 works and generates heat, it can reduce the change of the cooperation state between the bearing and the bearing mounting seat 3, solve the problem of the outer ring creep of the bearing caused by the bearing mounting seat 3 during operation, reduce the situation of abnormal noise generated by the stator assembly 100, improve the reliability and stability of the stator assembly 100, and extend the service life of the stator assembly 100.

[0057] The other components and operations of the stator assembly 100 and the motor according to the embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail here.

[0058] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0059] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A stator assembly, characterized in that: The stator assembly is formed as a single piece and comprises: A housing having a mounting hole; A stator assembly, the stator assembly is embedded in the housing and arranged around the mounting hole; A bearing mounting seat is arranged in the mounting hole, and the bearing mounting seat is an iron-based powder metallurgy part.

2. The stator assembly according to claim 1, characterized in that: The housing, the stator assembly and the bearing mounting seat are formed as an integral piece by an injection molding process.

3. The stator assembly according to claim 1, characterized in that: A positioning boss extending along the circumferential direction of the bearing mounting seat is provided on the outer peripheral wall of the bearing mounting seat, and a positioning groove cooperating with the positioning boss is provided on the inner wall of the mounting hole.

4. The stator assembly according to claim 3, characterized in that: Along the axial direction of the mounting hole, a positioning hole is provided on at least one of the two opposite sides of the positioning groove on the shell, and the positioning hole is located radially outside the mounting hole. The positioning hole extends along the axial direction of the mounting hole and passes through the side wall of the positioning groove.

5. The stator assembly according to claim 4, characterized in that: The positioning boss extends in a ring shape along the circumferential direction of the bearing mounting seat. Along the axial direction of the mounting hole, the positioning holes located on the same side of the positioning groove are multiple and spaced apart along the circumferential direction of the positioning boss.

6. The stator assembly according to claim 4, characterized in that: The positioning boss extends in a ring shape along the circumferential direction of the bearing mounting seat. Along the axial direction of the mounting hole, there are multiple positioning holes located on the same side of the positioning groove. The multiple positioning holes are divided into multiple positioning hole groups arranged at intervals in the radial direction of the positioning boss. Each positioning hole group includes multiple positioning holes arranged at intervals along the circumferential direction of the positioning boss. Along the circumferential direction of the positioning boss, the positioning holes of two adjacent positioning hole groups are staggered.

7. The stator assembly according to claim 4, characterized in that: The diameter of the positioning hole is a, and satisfies: 1mm≤a≤4mm.

8. The stator assembly according to claim 4, characterized in that: Along the radial direction of the positioning boss, the minimum distance between the positioning hole and the outer peripheral wall of the bearing mounting seat is b, and satisfies: 0.5mm≤b≤2mm.

9. The stator assembly according to claim 1, characterized in that: The shell is completely covered outside the stator assembly.

10. A motor, characterized in that: Comprising a stator assembly according to any one of claims 1-9.

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