Stator assembly and motor with same

Abstract

The utility model provides a stator assembly and a motor with the same. The stator assembly includes: a stator core; an inner casing and an outer casing, wherein the inner casing is used for sleeving the stator core; the outer casing is used for sleeving the inner casing positioned on the stator core; in the circumferential direction of the stator core, the inner casing is an equal-wall-thickness casing, and the outer casing is a non-equal-wall-thickness casing. According to the technical scheme provided by the utility model, the technical problem that the roundness and cylindricity of the outer diameter of the stator iron core are easily influenced when the casing is assembled in the prior art can be solved.

Description

Technical Field

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

[0002] At present, in the application field of permanent magnet synchronous servo motors, the stator usually adopts a split structure to facilitate automatic stator winding, which is beneficial to the mass production of the motor.

[0003] However, to ensure proper heat dissipation and ease of use, the motor casing is typically designed with uneven thickness along the circumference of the stator. When the casing is shrink-fitted onto the stator core, this uneven thickness causes uneven expansion during high-temperature heating and uneven contraction along the circumference during low-temperature shrinkage. Consequently, the force applied by the casing to the stator's outer diameter is also uneven, making it difficult to maintain the roundness and cylindricity of the stator's outer diameter. This, in turn, affects the roundness and cylindricity of the stator's inner diameter, increasing the motor's cogging torque. Utility Model Content

[0004] The main purpose of the utility model is to provide a stator assembly and a motor having the same, so as to solve the technical problem in the prior art that the roundness and cylindricity of the outer diameter of the stator core are easily affected during the assembly of the casing.

[0005] In order to achieve the above object, according to one aspect of the present invention, a stator assembly is provided, comprising:

[0006] stator core;

[0007] An inner casing and an outer casing, wherein the inner casing is used to be sleeved on the stator core; and the outer casing is used to be sleeved on the inner casing located on the stator core;

[0008] Wherein, along the circumferential direction of the stator core, the inner casing is a casing with uniform wall thickness, and the outer casing is a casing with non-uniform wall thickness.

[0009] Furthermore, the inner casing is a first annular casing; and / or,

[0010] The outer shell is a second annular shell, the inner wall of the second annular shell is adapted to the shape of the inner shell, and a heat dissipation recess is provided on the outer wall of the second annular shell.

[0011] Furthermore, a first positioning portion is provided on the side of the inner casing away from the stator core, and a second positioning portion is provided on the side of the outer casing close to the inner casing. The first positioning portion and the second positioning portion are adaptively arranged to position the installation position of the outer casing in the circumferential direction of the inner casing.

[0012] Furthermore, a connection hole is provided on the outer casing; the stator assembly also includes a fastener;

[0013] The fastener is inserted into the connecting hole and connected to the connecting hole, and one end of the fastener close to the inner casing abuts against the inner casing; or

[0014] A locking hole is provided on the inner casing, and a fastener is used to pass through the connecting hole and connect with the locking hole.

[0015] Furthermore, the stator core has an inner ring and an outer ring; the stator assembly further includes a core shaft, the core shaft having a positioning position inserted in the inner ring and a avoidance position avoiding the stator core;

[0016] The core shaft is provided with a cavity extending along a preset direction and an opening connected to the cavity, so that the core shaft can be cooled and shrunk by introducing a cooling medium into the cavity.

[0017] Furthermore, the stator core has an inner ring and an outer ring; the stator assembly also includes a core shaft, which is used to be inserted into the inner ring;

[0018] wherein the outer diameter roundness of the core shaft is greater than or equal to 0 mm and less than or equal to 0.02 mm; and / or,

[0019] The cylindricity of the mandrel is greater than or equal to 0 mm and less than or equal to 0.02 mm; and / or,

[0020] The core shaft has an annular enclosure, and d1 is the minimum thickness of the annular enclosure along the radial direction of the stator core; wherein d1 ≥ 3 mm.

[0021] Furthermore, d2≥1.5mm; wherein d2 is the thickness of the inner casing along the radial direction of the stator core; and / or,

[0022] d3≥3mm; where d3 is the minimum thickness of the outer casing along the radial direction of the stator core.

[0023] Furthermore, the inner housing and the stator core have an interference fit; wherein the interference fit between the inner housing and the stator core is greater than or equal to 0.02 mm and less than or equal to 0.035 mm; and / or,

[0024] The inner housing and the outer housing are interference fit; wherein the interference fit amount between the inner housing and the outer housing is greater than or equal to 0.005 mm and less than or equal to 0.015 mm.

[0025] Furthermore, the inner casing is shrink-fitted to the stator core; and / or the outer casing is shrink-fitted to the inner casing.

[0026] According to another aspect of the present invention, a motor is provided, comprising: the stator assembly provided above.

[0027] By applying the technical solution of the present invention, it is possible to apply a uniform force to the circumference of the stator core through the arrangement of the inner and outer casings, with the inner casing having a shell of equal wall thickness, and to meet the different requirements of the casing shape of the produced product through the outer casing having a shell of unequal wall thickness. In this way, during assembly, the inner casing can be assembled first, and when subjected to a high-temperature heating treatment, the inner casing can produce an equal amount of expansion along its circumferential direction; when subjected to a low-temperature shrinkage treatment, the inner casing can produce an equal amount of contraction along its circumferential direction. Therefore, during the process of assembling the inner casing onto the stator core, the inner casing can apply an equal amount of uniform force to the outer edge of the stator core in the circumferential direction, thereby not affecting the roundness and cylindricity of the outer edge of the stator core. Therefore, the technical solution of the present invention can solve the technical problem in the prior art that the roundness and cylindricity of the outer diameter of the stator core are easily affected during casing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 FIG2 shows a front view of a stator assembly provided according to the first embodiment of the present utility model;

[0030] Figure 2 shows a cross-sectional view of a stator assembly provided according to embodiment 1 of the present utility model;

[0031] Figure 3 Shown Figure 2 A schematic diagram of the structure at center A;

[0032] Figure 4 FIG1 shows a schematic structural diagram of a split core of a stator assembly provided in accordance with the first embodiment of the present invention;

[0033] Figure 5 FIG4 shows a front view of a stator core of a stator assembly provided according to the first embodiment of the present invention;

[0034] Figure 6 FIG1 shows a schematic structural diagram of a core shaft of a stator assembly provided in accordance with the first embodiment of the present utility model;

[0035] Figure 7 A schematic structural diagram of an outer casing of a stator assembly provided in accordance with the first embodiment of the present invention is shown;

[0036] Figure 8 FIG1 shows a schematic structural diagram of an inner casing of a stator assembly provided in accordance with the first embodiment of the present invention;

[0037] Figure 9A front view of a stator punching sheet of a stator assembly provided according to the first embodiment of the present utility model is shown;

[0038] Figure 10 A front view of a stator punching sheet of a stator assembly provided according to the first embodiment of the present invention is shown.

[0039] The above drawings include the following reference numerals:

[0040] 10. Stator core;

[0041] 11. Split iron core; 111. Inner side; 112. Iron core blocks; 113. Winding skeleton; 114. Slot paper;

[0042] 20. Inner housing; 21. First positioning portion;

[0043] 30. Outer housing; 31. Second positioning portion; 32. Connecting hole;

[0044] 40. Mandrel; 41. Cavity; 42. Opening;

[0045] 1. Stator lamination separation;

[0046] 2. Stator punching. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0048] like Figures 1 to 10 As shown, the first embodiment of the present invention provides a stator assembly, which includes a stator core 10, an inner housing 20, and an outer housing 30. The inner housing 20 is configured to be mounted on the stator core 10; the outer housing 30 is configured to be mounted on the inner housing 20 located on the stator core 10. Along the circumferential direction of the stator core 10, the inner housing 20 has a uniform wall thickness, while the outer housing 30 has a non-uniform wall thickness.

[0049] The stator assembly provided by the first embodiment of the present invention can, through the arrangement of the inner housing 20 and the outer housing 30, apply a uniform force to the circumference of the stator core 10 through the inner housing 20 of the shell having a uniform wall thickness, and meet the different requirements of the shell shape of the produced product through the outer housing 30 of the shell having a non-uniform wall thickness. In this way, during assembly, the inner housing 20 can be assembled first. When subjected to a high-temperature heating treatment, the inner housing 20 can produce an equal amount of expansion along its circumferential direction; when subjected to a low-temperature shrinkage treatment, the inner housing 20 can produce an equal amount of contraction along its circumferential direction. Therefore, during the process of assembling the inner housing 20 onto the stator core 10, the inner housing 20 can apply an equal amount of uniform force to the outer edge of the stator core 10 in the circumferential direction, thereby not affecting the roundness and cylindricity of the outer edge of the stator core 10. Therefore, the stator assembly provided by this embodiment can solve the technical problem in the prior art that the roundness and cylindricity of the outer diameter of the stator core can be easily affected during the assembly of the housing.

[0050] Specifically, a uniform-wall-thickness housing refers to a housing with a substantially uniform thickness along the circumference of the inner housing 20. That is, the thickness of the inner housing 20 at all locations along the circumference is within a preset tolerance range. A non-uniform-wall-thickness housing refers to a housing with a varying thickness along the circumference of the outer housing 30. That is, the thickness of the outer housing 30 at all locations along the circumference is not exactly the same, and the difference in thickness is outside a preset tolerance range.

[0051] Specifically, in order to be conveniently mounted on the stator core 10 , the inner housing 20 is a first annular housing.

[0052] Specifically, the outer housing 30 is a second annular housing, the inner wall of which matches the shape of the inner housing 20. A heat dissipation recess is provided on the outer wall of the second annular housing. This structural arrangement facilitates the outer housing 30 to be fitted over the outer edge of the inner housing 20 due to the annular shape of the housing. Furthermore, the provision of the heat dissipation recess improves the heat dissipation performance of the housing.

[0053] Specifically, a first positioning portion 21 is provided on the side of the inner housing 20 away from the stator core 10, and a second positioning portion 31 is provided on the side of the outer housing 30 closer to the inner housing 20. The first positioning portion 21 and the second positioning portion 31 are adapted to locate the outer housing 30 in the circumferential direction of the inner housing 20. This structural arrangement allows the outer housing 30 to be quickly positioned when it is installed on the inner housing 20 through the cooperative relationship between the first positioning portion 21 and the second positioning portion 31. Furthermore, the provision of the first positioning portion 21 and the second positioning portion 31 further ensures relative stability between the outer housing 30 and the inner housing 20 after assembly.

[0054] Specifically, the first positioning portion 21 is a positioning protrusion, and the second positioning portion 31 is a positioning groove. The positioning protrusion and the positioning groove are configured to match each other. Specifically, the positioning protrusion extends along the axial direction of the inner housing 20, and the positioning groove extends along the axial direction of the outer housing 30. This structural arrangement can further enhance the positioning effect between the inner housing 20 and the outer housing 30, and reduce the possibility of shaking between the inner housing 20 and the outer housing 30.

[0055] Specifically, the outer housing 30 is provided with a connection hole 32. The stator assembly also includes a fastener. The fastener is inserted into and connected to the connection hole 32, with the end of the fastener proximate to the inner housing 20 abutting against the inner housing 20. This structural arrangement, through the coordination of the fastener and the connection hole 32, enhances the connection stability between the outer housing 30 and the inner housing 20, further ensuring a relative static state between the outer housing 30 and the inner housing 20.

[0056] Specifically, the connecting hole 32 is a threaded hole, and the fastener is a set screw.

[0057] Specifically, the outer housing 30 is provided with a connection hole 32. The stator assembly also includes a fastener. The inner housing 20 is provided with a locking hole, through which the fastener is inserted and connected. Specifically, the fastener and the locking hole are locked. This structural arrangement, through the coordinated arrangement of the fastener, the locking hole, and the connection hole 32, enhances the connection stability between the outer housing 30 and the inner housing 20, further ensuring a relative static state between the outer housing 30 and the inner housing 20.

[0058] In this embodiment, the stator core 10 has an inner ring and an outer ring. The stator assembly also includes a core shaft 40, which has a fixed position for insertion into the inner ring and a clearance position for clearance from the stator core 10. This structural arrangement allows the core shaft 40 to constrain the inner ring of the stator core 10, thereby ensuring the roundness and cylindricity of the inner ring of the stator core 10.

[0059] Specifically, the stator core 10 has an inner ring and an outer ring. The stator assembly also includes a core shaft 40, which has a positioning position inserted in the inner ring and a retracted position that retracts from the stator core 10. The core shaft 40 is provided with a cavity 41 extending along a preset direction and an opening 42 connected to the cavity 41, so that the core shaft 40 can be shrunk by passing a cooling medium into the cavity 41. With such a structural arrangement, the cavity 41 and the opening 42 facilitate the passage of a cooling medium into the core shaft 40, thereby facilitating the contraction of the core shaft 40 under the action of the cooling medium, thereby facilitating the removal of the core shaft 40 from the stator core 10.

[0060] Specifically, the cooling medium is liquid nitrogen.

[0061] Specifically, the stator core 10 is formed by splicing together multiple split cores 11. The inner side 111 of the split core 11 is used to attach to the outer edge of the core shaft 40. Specifically, the split core 11 includes a core block 112, a winding skeleton 113, and slot paper 114. The winding skeleton 113 is used to support and position the stator winding, allowing the winding to be tightly and evenly embedded in the slots of the split core 11. The core block 112 is formed by stacking multiple stator punchings 1. Figure 10 1 shows a stator sheet 2 formed by splicing stator sheet segments 1. With such a structural arrangement, the split iron core 11 effectively simplifies the manufacturing process of the stator and improves production efficiency.

[0062] Specifically, the stator core 10 has an inner ring and an outer ring. The stator assembly also includes a core shaft 40, which is inserted into the inner ring. The outer diameter of the core shaft 40 has a roundness greater than or equal to 0 mm and less than or equal to 0.02 mm. This structural arrangement ensures the roundness of the inner ring of the stator core 10 through the outer diameter roundness of the core shaft 40.

[0063] Specifically, the stator core 10 has an inner ring and an outer ring. The stator assembly also includes a core shaft 40, which is inserted into the inner ring. The cylindricity of the core shaft 40 is greater than or equal to 0 mm and less than or equal to 0.02 mm. This structural arrangement ensures the cylindricity of the inner ring of the stator core 10 through the cylindricity of the core shaft 40.

[0064] Specifically, the stator core 10 has an inner ring and an outer ring. The stator assembly also includes a core shaft 40, which is inserted into the inner ring. The core shaft 40 has an annular enclosure, where d1 represents the minimum thickness of the annular enclosure along the radial direction of the stator core 10; d1 is ≥ 3 mm. This structural arrangement ensures the structural strength of the core shaft 40 by limiting the minimum thickness of the annular enclosure along the radial direction of the stator core 10, thereby improving its durability.

[0065] In this embodiment, d2 is ≥ 1.5 mm, where d2 is the thickness of the inner housing 20 along the radial direction of the stator core 10. This structural arrangement limits the thickness of the inner housing 20 along the radial direction of the stator core 10, thereby ensuring the structural strength of the inner housing 20, improving the service life of the inner housing 20, and preventing damage to the inner housing 20.

[0066] In this embodiment, d3 ≥ 3 mm, where d3 is the minimum thickness of the outer housing 30 along the radial direction of the stator core 10. This structural arrangement ensures the structural strength of the outer housing 30 by limiting the minimum thickness of the outer housing 30 along the radial direction of the stator core 10, thereby increasing the service life of the outer housing 30 and preventing damage to the outer housing 30.

[0067] In this embodiment, the inner housing 20 and the stator core 10 have an interference fit; the interference fit between the inner housing 20 and the stator core 10 is greater than or equal to 0.02 mm and less than or equal to 0.035 mm. This structural arrangement ensures a stable connection between the inner housing 20 and the stator core 10 through the interference fit, further ensuring a relatively static relationship between the inner housing 20 and the stator core 10.

[0068] Specifically, the inner housing 20 and the outer housing 30 have an interference fit; the interference fit between the inner housing 20 and the outer housing 30 is greater than or equal to 0.005 mm and less than or equal to 0.015 mm. This structural arrangement ensures the connection stability between the inner housing 20 and the outer housing 30 through the interference fit between the inner housing 20 and the outer housing 30, further ensuring the relative static relationship between the inner housing 20 and the outer housing 30.

[0069] Specifically, the inner housing 20 is shrink-fitted onto the stator core 10. This structural arrangement allows for a convenient and secure connection between the inner housing 20 and the stator core 10 through shrink-fitting, while also preventing damage to the surfaces of the inner housing 20 and stator core 10. This shrink-fitting process achieves a seamless connection between motor components, improving the overall mechanical strength of the stator assembly. Furthermore, by precisely controlling the temperature and pressure during the shrink-fitting process, deformation of motor components can be reduced.

[0070] Specifically, the outer housing 30 is heat-fitted with the inner housing 20. In this way, a stable connection between the outer housing 30 and the inner housing 20 can be conveniently achieved through the heat-fitting process, while avoiding damage to the surfaces of the outer housing 30 and the inner housing 20.

[0071] Specifically, the stator assembly method includes: splicing multiple split cores 11 to obtain a stator core 10; sleeve the inner casing 20 on the stator core 10; and sleeve the outer casing 30 on the inner casing 20; wherein, along the circumferential direction of the stator core 10, the inner casing 20 is a shell of uniform wall thickness, and the outer casing 30 is a shell of non-uniform wall thickness.

[0072] By adopting this arrangement, the inner housing 20 and the outer housing 30 can be configured to apply a uniform force to the circumference of the stator core 10 through the inner housing 20 having a uniform wall thickness, while the outer housing 30 having a non-uniform wall thickness can meet the different housing shape requirements of the product being produced. Thus, during assembly, the inner housing 20 can be assembled first. When subjected to a high-temperature heating treatment, the inner housing 20 can expand equally along its circumferential direction; when subjected to a low-temperature shrinkage treatment, the inner housing 20 can contract equally along its circumferential direction. As a result, during the process of assembling the inner housing 20 onto the stator core 10, the inner housing 20 can apply an equal and uniform force to the outer edge of the stator core 10 in the circumferential direction, thereby not affecting the roundness and cylindricity of the outer edge of the stator core 10. Therefore, this stator assembly method can solve the technical problem in the prior art that the roundness and cylindricity of the stator core outer diameter can be easily affected during housing assembly.

[0073] Specifically, the method for splicing multiple split cores 11 includes: placing the inner sides 111 of the split cores 11 against the outer surface of the core shaft 40; splicing the multiple split cores 11 along the circumferential direction of the core shaft 40; and securely connecting two adjacent split cores 11. This arrangement ensures the roundness and cylindricity of the inner ring of the spliced ​​stator core 10 through the core shaft 40.

[0074] Specifically, after the outer housing 30 is sleeved onto the inner housing 20, the assembly method further includes: cooling the core shaft 40 to a first preset temperature; and separating the core shaft 40 from the stator core 10. The first preset temperature is greater than or equal to -180°C and less than or equal to -150°C. This method allows the core shaft 40 to shrink by cooling, facilitating separation from the stator core 10 while preventing damage to the surface of the stator core 10.

[0075] Specifically, the method for attaching the inner housing 20 to the stator core 10 includes: heating the inner housing 20 to a second predetermined temperature, attaching the inner housing 20 to the stator core 10; and cooling the inner housing 20 and the stator core 10; wherein the second predetermined temperature is greater than or equal to 200°C and less than or equal to 220°C. This arrangement facilitates a secure connection between the inner housing 20 and the stator core 10 while preventing damage to the surfaces of the inner housing 20 and the stator core 10.

[0076] Specifically, the method for fitting the outer housing 30 onto the inner housing 20 includes: heating the outer housing 30 to a third preset temperature, fitting the outer housing 30 onto the inner housing 20; and cooling the outer housing 30, the inner housing 20, and the stator core 10; wherein the third preset temperature is greater than or equal to 120°C and less than or equal to 150°C. This arrangement facilitates a secure connection between the outer housing 30 and the inner housing 20 while preventing damage to the surfaces of the outer housing 30 and the inner housing 20.

[0077] In this embodiment, the split core 11 is welded around the outer edge of the core shaft 40. After the stator core 10 is formed by welding, the inner housing 20 is heated to 200°C without removing the core shaft 40. The inner housing 20 is then shrink-fitted onto the outer side of the stator core 10. After the inner housing 20 and the stator core 10 cool, an interference fit exists between the inner housing 20 and the stator core 10, and between the stator core 10 and the core shaft 40. The outer housing 30 is heated to 120°C and shrink-fitted onto the outer side of the inner housing 20, ensuring that the positioning protrusions and positioning grooves are properly aligned. A set screw is then screwed into the threaded hole of the outer housing 30. The interference fit between the outer housing 30 and the inner housing 20, the set screw, and the structure of the positioning protrusions and positioning grooves ensure that the outer housing 30 and the inner housing 20 remain relatively stationary. Finally, liquid nitrogen is injected into the cavity 41 in the core shaft 40 . After the core shaft 40 is cooled to −150° C., the core shaft 40 is removed from the stator core 10 to complete the assembly.

[0078] A second embodiment of the present invention provides a motor, which includes the stator assembly provided in the first embodiment.

[0079] The motor provided by the second embodiment of the present invention can, through the arrangement of the inner housing 20 and the outer housing 30, apply a uniform force to the circumference of the stator core 10 through the inner housing 20 of a shell with a uniform wall thickness, and meet the different housing shape requirements of the produced product through the outer housing 30 of a shell with a non-uniform wall thickness. In this way, during assembly, the inner housing 20 can be assembled first. When subjected to a high-temperature heating treatment, the inner housing 20 can produce an equal amount of expansion along its circumferential direction; when subjected to a low-temperature shrinkage treatment, the inner housing 20 can produce an equal amount of contraction along its circumferential direction. Therefore, during the process of assembling the inner housing 20 onto the stator core 10, the inner housing 20 can apply an equal amount of uniform force to the outer edge of the stator core 10 in the circumferential direction, thereby not affecting the roundness and cylindricity of the outer edge of the stator core 10. Therefore, the motor provided by this embodiment can solve the technical problem in the prior art that the roundness and cylindricity of the outer diameter of the stator core can be easily affected during housing assembly.

[0080] Specifically, the motor may be a permanent magnet synchronous servo motor.

[0081] From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the housing adopts a radially split structure, and the outer housing can be designed with corresponding characteristics according to customer requirements. The inner housing and semi-hollow core shaft provide interference constraints on the inner and outer diameters of the split stator core, ensuring the roundness and cylindricity of the stator core's inner diameter, improving the misalignment between the stator and rotor, and reducing the motor's cogging torque.

[0082] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0083] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0084] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0085] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0086] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A stator assembly, characterized in that: include: stator core (10); An inner housing (20) and an outer housing (30), wherein the inner housing (20) is used to be sleeved on the stator core (10); and the outer housing (30) is used to be sleeved on the inner housing (20) located on the stator core (10); Wherein, along the circumferential direction of the stator core (10), the inner casing (20) is a casing with a uniform wall thickness, and the outer casing (30) is a casing with a non-uniform wall thickness.

2. The stator assembly according to claim 1, characterized in that The inner housing (20) is a first annular housing; and / or, The outer housing (30) is a second annular housing, the inner wall of the second annular housing is adapted to the shape of the inner housing (20), and a heat dissipation recess is provided on the outer wall of the second annular housing.

3. The stator assembly according to claim 1, characterized in that A first positioning portion (21) is provided on a side of the inner housing (20) away from the stator core (10), and a second positioning portion (31) is provided on a side of the outer housing (30) close to the inner housing (20). The first positioning portion (21) and the second positioning portion (31) are adaptively arranged to position the installation position of the outer housing (30) in the circumferential direction of the inner housing (20).

4. The stator assembly according to claim 1, wherein: The outer housing (30) is provided with a connection hole (32); the stator assembly further includes a fastener; Wherein, the fastener is used to be inserted into the connecting hole (32) and connected to the connecting hole (32), and one end of the fastener close to the inner housing (20) abuts against the inner housing (20); or, A locking hole is provided on the inner casing (20), and the fastener is used to pass through the connecting hole (32) and be connected to the locking hole.

5. The stator assembly according to claim 1, characterized in that The stator core (10) has an inner ring and an outer ring; the stator assembly further includes a core shaft (40), the core shaft (40) having a positioning position inserted in the inner ring and a avoidance position avoiding the stator core (10); The core shaft (40) is provided with a cavity (41) extending along a preset direction and an opening (42) connected to the cavity (41), so that the core shaft (40) can be shrunk by passing a cooling medium into the cavity (41).

6. The stator assembly according to claim 1, wherein: The stator core (10) has an inner ring and an outer ring; the stator assembly further comprises a core shaft (40), and the core shaft (40) is used to be inserted into the inner ring; Wherein, the outer diameter roundness of the core shaft (40) is greater than or equal to 0 mm and less than or equal to 0.02 mm; and / or, The cylindricity of the core shaft (40) is greater than or equal to 0 mm and less than or equal to 0.02 mm; and / or, The core shaft (40) has an annular enclosure, and d1 is the minimum thickness of the annular enclosure along the radial direction of the stator core (10); wherein d1 is ≥ 3 mm.

7. The stator assembly according to claim 1, characterized in that d2≥1.5mm; wherein d2 is the thickness of the inner housing (20) along the radial direction of the stator core (10); and / or, d3≥3mm; wherein d3 is the minimum thickness of the outer casing (30) along the radial direction of the stator core (10).

8. The stator assembly according to claim 1, wherein: The inner housing (20) and the stator core (10) are interference-fitted; wherein the interference-fit amount between the inner housing (20) and the stator core (10) is greater than or equal to 0.02 mm and less than or equal to 0.035 mm; and / or, The inner housing (20) and the outer housing (30) are interference-fitted; wherein the interference-fit amount between the inner housing (20) and the outer housing (30) is greater than or equal to 0.005 mm and less than or equal to 0.015 mm.

9. The stator assembly according to claim 1, wherein: The inner housing (20) is shrink-fitted to the stator core (10); and / or the outer housing (30) is shrink-fitted to the inner housing (20).

10. A motor, characterized in that: include: The stator assembly according to any one of claims 1 to 9.

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