Stator jacket, stator assembly and motor

Abstract

The present invention discloses a stator sleeve, a stator assembly and a motor. The stator sleeve includes: a vibration-damping bracket, which is sleeved on the outer periphery of the stator body and is provided with a plurality of matching grooves; a plurality of sound-absorbing components, which are respectively arranged in the plurality of matching grooves and form a containing space wrapped around the outer periphery of the stator body with the vibration-damping bracket; wherein the sound-absorbing components and the vibration-damping bracket are made of different materials. The stator sleeve is composed of the vibration-damping bracket and the sound-absorbing component, which are made of different materials. On the one hand, the damping coefficient of the motor can be increased and the amplitude of the vibration transfer function can be reduced by the vibration-damping bracket. On the other hand, the sound-absorbing component can absorb the noise generated by the motor. The vibration-damping bracket and the sound-absorbing component can be combined to suppress vibration and reduce noise from two paths, thereby achieving a vibration suppression and noise reduction effect greater than that of a single material.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a stator sleeve, a stator assembly and a motor. Background Art

[0002] With the development of automobile manufacturing industry, automobile NVH performance has become a comprehensive technical indicator of modern automobile manufacturing quality. NVH is the abbreviation of noise, vibration and harshness. NVH gives the most direct and superficial feeling to automobile users. The NVH problem of vehicles is one of the issues that major vehicle manufacturers and parts manufacturers in the international automobile industry are concerned about. Statistics show that about 1 / 3 of the fault problems of the whole vehicle are related to the NVH problem of the vehicle.

[0003] The main excitation sources that affect the noise level in the car are the engine, motor, reducer, tires and other components. For electric vehicles, the main excitation source comes from the motor. There are many motors used in cars, so the noise and vibration research of motors is becoming more and more important.

[0004] In the related art, a plurality of axial grooves are arranged along the circumferential direction on the yoke of the motor stator punching sheet, and the grooves are empty or filled with damping medium. However, the storage of the damping medium is inconvenient and is prone to leakage. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a stator cover, which is composed of a vibration-damping bracket and a sound-absorbing member. On the one hand, the vibration-damping bracket can increase the damping coefficient of the motor and reduce the amplitude of the vibration transfer function. On the other hand, the sound-absorbing member can absorb the noise generated by the motor.

[0006] The present invention further provides a stator assembly.

[0007] The invention also provides a motor.

[0008] According to the first aspect of the present invention, the stator sleeve includes: a vibration-damping bracket, which is sleeved on the outer periphery of the stator body and is provided with a plurality of matching grooves; a plurality of sound-absorbing members, which are respectively arranged in the plurality of matching grooves and form a receiving space wrapped around the outer periphery of the stator body with the vibration-damping bracket; wherein the sound-absorbing members and the vibration-damping bracket are made of different materials.

[0009] According to the stator cover of the embodiment of the present invention, the stator cover is composed of a vibration-damping bracket and a sound-absorbing component, which are made of different materials. On the one hand, the vibration-damping bracket can increase the damping coefficient of the motor and reduce the amplitude of the vibration transfer function. On the other hand, the sound-absorbing component can absorb the noise generated by the motor. The vibration-damping bracket and the sound-absorbing component can be used for dual combination to suppress vibration and reduce noise from two paths, thereby achieving a vibration-damping and noise-reduction effect greater than that of a single material.

[0010] According to some embodiments of the present invention, the vibration-damping bracket includes: two ring portions and a plurality of connecting portions, the two ring portions are respectively arranged at the two ends of the plurality of connecting portions, the plurality of connecting portions are arranged at intervals between the two ring portions, and the matching groove is formed between any two adjacent connecting portions and the two ring portions.

[0011] According to some embodiments of the present invention, the connecting portion is arranged obliquely relative to the ring portion.

[0012] According to some embodiments of the present invention, the angle between the connecting portion and the ring portion is θ, and θ satisfies the relationship: 45°≤θ≤135°.

[0013] According to some embodiments of the present invention, the thickness of the ring portion is w1, the diameter of the stator body is d, and w1 and d satisfy the relationship: 0.027≤w1 / d≤0.207.

[0014] According to some embodiments of the present invention, the thickness of the sound absorbing member is w3, and w3 and w1 satisfy the relationship: w3≤w1.

[0015] According to some embodiments of the present invention, the width of the connecting portion is w2, the number of the connecting portions is n, and w2 and n satisfy the relationship: 0.1≤w2 / n≤10.

[0016] According to some embodiments of the present invention, the vibration-damping bracket is made of one or more of an alloy material, a composite material, a foam metal material, and a porous ceramic material.

[0017] According to some embodiments of the present invention, the sound absorbing element is made of one or more of aerogel material, polyurethane material, polyester material and rubber material.

[0018] The stator assembly according to the second aspect of the present invention comprises: a stator body, which is composed of a plurality of stator laminations stacked in the axial direction; and a stator sleeve, which is sleeved on the outer periphery of the stator body.

[0019] According to some embodiments of the present invention, a plurality of stator teeth are circumferentially arranged on the inner wall of each stator lamination, a side of the stator tooth away from the inner wall of the stator lamination is a tooth top, and a side surface of the tooth top is provided with an arc portion.

[0020] According to some embodiments of the present invention, one side of the tooth top is provided on the arc-shaped portion; or the arc-shaped portion is provided on both sides of the tooth top.

[0021] According to some embodiments of the present invention, a plurality of the stator teeth are all provided with the arc-shaped portion; or, a portion of the plurality of the stator teeth are provided with the arc-shaped portion.

[0022] According to some embodiments of the present invention, the stator laminations are made of amorphous material, and the stator laminations are formed by compositely forming at least two layers of amorphous thin strips.

[0023] According to some embodiments of the present invention, the thickness of the stator lamination is Ls, the outer diameter of the stator lamination is Ds, and the stacking coefficient of the stator lamination is a, and a satisfies the relationship: 0.19‰≤a=Ls / Ds≤1.68‰.

[0024] The motor according to the third aspect of the present invention comprises: the stator assembly; and a rotor assembly, wherein the rotor assembly is fitted in the inner wall of the stator assembly.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 is a structural schematic diagram of a stator assembly according to an embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of a stator sheath according to an embodiment of the present invention;

[0029] Figure 3 is a schematic structural diagram of a vibration-damping bracket according to an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the structure of the stator lamination according to an embodiment of the present invention.

[0031] Reference numerals:

[0032] 100. stator assembly;

[0033] 10. stator jacket; 11. vibration-damping bracket; 111. ring portion; 112. connecting portion; 113. matching groove; 12. sound-absorbing member;

[0034] 20. stator body; 21. stator laminations; 211. stator teeth; 212. arc-shaped portion. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0036] Reference below Figure 1-Figure 4 A stator sheath 10 according to an embodiment of the present invention is described. The present invention also provides a stator assembly 100 . Furthermore, the present invention also provides a motor.

[0037] like Figure 2 As shown, the stator jacket 10 of the embodiment of the present invention includes: a vibration-damping bracket 11 and a plurality of sound-absorbing members 12 . The vibration-damping bracket 11 is sleeved on the outer periphery of the stator body 20 . The vibration-damping bracket 11 is provided with a plurality of matching grooves 113 . The plurality of sound-absorbing members 12 are respectively arranged in the plurality of matching grooves 113 .

[0038] That is, the vibration-damping bracket 11 converts the vibration energy of the solid machinery into internal energy and consumes it by the mutual movement of molecules inside the material and structure. There are a large number of interconnected micropores or gaps inside the sound-absorbing component 12. When sound waves propagate in the material, they will cause the air in the pores to move and rub against the solid pore ribs or pore walls that form the pore walls. Due to the viscosity and heat conduction effects, the sound energy will be converted into heat energy and consumed, thereby realizing the dual combined shock-absorbing and sound-absorbing functions.

[0039] In addition, the multiple sound absorbing members 12 and the vibration-damping bracket 11 form a receiving space wrapped around the outer circumference of the stator body 20, that is, the vibration-damping bracket 11 and the multiple sound absorbing members 12 constitute a circumferential full-coverage design, and the circumference of the stator body 20 is completely covered by the vibration-damping bracket and the sound absorbing member 12, so as to avoid excessive vibration in some parts due to lack of coverage, thereby increasing noise. At the same time, the vibration-damping bracket 11 is close to the outer ring of the stator body 20, which can improve the stiffness of the stator body 20, thereby improving the impact of vibration noise.

[0040] Furthermore, the stator sheath 10 uses shock-absorbing materials and sound-absorbing materials, and the combination types and proportions of the materials are not limited. On the one hand, the damping coefficient of the motor can be increased and the amplitude of the vibration transfer function can be reduced through the shock-absorbing bracket. On the other hand, the sound-absorbing component 12 can absorb the noise generated by the motor. The two materials can be combined in two ways to suppress vibration and reduce noise, and the effect is greater than using a single material.

[0041] In addition, the sound absorbing member 12 and the matching groove 113 have the same shape, so that the sound absorbing member 12 and the vibration-damping bracket 11 can form a circumferential wrapping of the stator body, thereby avoiding excessive local vibration due to lack of wrapping, which may lead to increased noise.

[0042] Furthermore, the sound absorbing member 12 is bonded to the matching groove 113 of the shock absorbing bracket by means of heat-conducting insulating glue.

[0043] Therefore, the stator sheath 10 is composed of a vibration-damping bracket 11 and a sound-absorbing component 12, which are made of different materials. On the one hand, the vibration-damping bracket can increase the damping coefficient of the motor and reduce the amplitude of the vibration transfer function. On the other hand, the sound-absorbing component 12 can absorb the noise generated by the motor. The vibration-damping bracket 11 and the sound-absorbing component 12 can be combined in two ways to achieve vibration suppression and noise reduction, thereby achieving a vibration suppression and noise reduction effect greater than that of a single material.

[0044] Reference Figure 3 As shown, the vibration-damping bracket 11 includes: two ring parts 111 and a plurality of connecting parts 112, the two ring parts 111 are respectively arranged at the two ends of the plurality of connecting parts 112, the plurality of connecting parts 112 are arranged at intervals between the two ring parts 111, and a matching groove 113 is formed between any two adjacent connecting parts 112 and the two ring parts 111. That is, two ring parts 111 are arranged at the two ends of the plurality of connecting parts 112, and a receiving space for receiving the stator body is formed between the plurality of connecting parts 112 and the two ring parts 111, so that the vibration-damping bracket 11 can be sleeved on the outside of the stator body.

[0045] The connection part 112 may be a support rod, that is, the connection part 112 has a certain support strength, so as to effectively improve the overall strength of the vibration-damping bracket 11 , thereby ensuring the strength of the vibration-damping bracket 11 when in use.

[0046] Furthermore, a matching groove 113 is formed between two adjacent connecting portions 112 and the two ring portions 111 , so that the sound absorbing member 12 fits in the matching groove 113 , that is, the edges of the sound absorbing member 12 can be fixed on the two adjacent connecting portions 112 and the two ring portions 111 , respectively.

[0047] Furthermore, the distances between two adjacent connection portions 112 are the same, thereby ensuring the overall stability of the vibration-damping bracket 11 .

[0048] Reference Figure 3 As shown, the connection portion 112 is arranged obliquely relative to the ring portion 111. That is, the connection portion 112 and the ring portion 111 are not arranged vertically, which can effectively improve the overall structural strength of the vibration-damping bracket 11, thereby ensuring the strength of the vibration-damping bracket 11 when in use.

[0049] Furthermore, the angle between the connecting portion 112 and the ring portion 111 is θ, and θ satisfies the relationship: 45°≤θ≤135°. That is, when the angle between the connecting portion 112 and the ring portion 111 is limited to between 45° and 135°, the overall structural strength of the vibration-damping bracket 11 can be effectively improved, thereby ensuring the strength of the vibration-damping bracket 11 when in use. Also, when the angle between the connecting portion 112 and the ring portion 111 is less than 45° or greater than 135°, the angle between the connecting portion 112 and the ring portion 111 is too small, which will affect the overall stability of the vibration-damping bracket 11.

[0050] And, if Figure 3 As shown, the thickness of the ring portion 111 is w1, and the diameter of the stator body 20 is d, and w1 and d satisfy the relationship: 0.027≤w1 / d≤0.207. That is to say, there is a relationship between the thickness of the ring portion 111 and the diameter of the stator body 20, that is, when the diameter of the stator body 20 is larger, the thickness of the ring portion 111 is also larger; when the diameter of the stator body 20 is smaller, the thickness of the ring portion 111 is also smaller. In this way, when the ratio between the thickness of the ring portion 111 and the diameter of the stator body 20 is between 0.027-0.207, the strength of the ring portion 111 can be guaranteed. When the ratio between the thickness of the ring portion 111 and the diameter of the stator body 20 is less than 0.027, the thickness of the ring portion 111 is thin, which affects the strength of the ring portion 111. When the ratio between the thickness of the ring portion 111 and the diameter of the stator body 20 is greater than 0.207, the thickness of the ring portion 111 is relatively thick, which may easily cause the overall size of the stator assembly 100 to be too large.

[0051] In addition, the thickness of the sound absorbing member 12 is w3, and the relationship between w3 and w1 is: w3≤w1. In other words, the thickness of the sound absorbing member 12 is less than or equal to the thickness of the ring portion 111, so that the sound absorbing member 12 does not protrude relative to the ring portion 111, thereby effectively avoiding the sound absorbing member 12 and the stator assembly 100 from being attached.

[0052] like Figure 3 As shown, the width of the connection portion 112 is w2, the number of the connection portions 112 is n, and w2 and n satisfy the relationship: 0.1≤w2 / n≤10. That is, the width of the connection portion 112 is related to the number of the connection portions 112, that is, the ratio between the width of the connection portion 112 and the number of the connection portions 112 is between 0.1-10.

[0053] According to some embodiments of the present invention, the vibration-damping bracket 11 is composed of one or more of alloy materials, composite materials, foam metal materials, and porous ceramic materials. In this way, the vibration-damping bracket 11 can use high-damping alloy materials, such as copper-zinc-aluminum alloys, iron-chromium-molybdenum alloys, manganese-copper alloys, etc.; or, the vibration-damping bracket 11 can use high-strength and high-damping composite materials, such as memory alloy-polymer interpenetrating phase composite materials, magnesium alloy-nickel-titanium alloy interpenetrating phase composite materials, high entropy alloy-nitrogen / oxygen atom interpenetrating phase composite materials, etc.; or, the vibration-damping bracket 11 can use foam metal materials, such as foam aluminum, foam nickel and other foam alloys; or, the vibration-damping bracket 11 can use porous ceramic materials, such as porous boride ceramics, porous ceramic ball composite foams, porous silicon nitride ceramics, etc. Further, the vibration-damping bracket 11 is combined with one or more of the above materials as needed, and the proportion of the combination is not limited.

[0054] According to some embodiments of the present invention, the sound absorbing member 12 is composed of one or more of aerogel materials, polyurethane materials, polyester materials and rubber materials. In this way, the sound absorbing member 12 can use aerogel materials, such as silica aerogel, ceramic nanofiber aerogel, polyethylene aerogel, etc. Or, the sound absorbing member 12 can use polyurethane and its composite materials, such as PU sound absorbing board, sound absorbing cotton, graphene modified polyurethane foam, etc.; or, the sound absorbing member 12 can use polyester and its composite materials, such as glass wool, recycled polyester fiber sound absorbing board, polyester foam, etc.; or, the sound absorbing member 12 can use or rubber and its composite materials, such as butyl rubber, nitrile rubber, polysulfide rubber, etc. Further, the sound absorbing member 12 can be combined with one or more of the above materials as needed, and the proportion of the combination is not limited.

[0055] The stator assembly 100 according to the second embodiment of the present invention comprises: a stator body 20 and a stator jacket 10, wherein the stator body 20 is composed of a plurality of stator laminations 21 stacked in the axial direction, and the stator jacket 10 is sleeved on the outer periphery of the stator body 20. That is, the stator jacket 10 is sleeved on the outer periphery of the stator body 20, the vibration-damping bracket 11 converts the vibration energy of the solid mechanical into internal energy, and consumes it by utilizing the mutual movement of molecules inside the material and structure, and the sound-absorbing member 12 has a large number of interconnected micropores or gaps inside, and when sound waves propagate in the material, they will cause the air in the pores to move, and rub against the solid pore ribs or pore walls forming the pore walls, and due to the viscosity and heat conduction effects, the sound energy will be converted into heat energy and consumed, so as to realize the dual combined shock-absorbing and sound-absorbing functions.

[0056] In addition, a plurality of stator teeth 211 are circumferentially arranged on the inner wall of each stator lamination 21, and the side of the stator tooth 211 away from the inner wall of the stator lamination 21 is the tooth top, and the side of the tooth top is provided with an arc portion 212. In other words, the side of the tooth top of the stator tooth 211 is subjected to arc chopping to form a structure that is wide at the top and narrow at the bottom, and a chamfered transition is performed, that is, the tooth top is subjected to arc chopping, and the tooth top arc chopping is beneficial to the distribution of air gap magnetic flux, reduces the harmonic amplitude, reduces torque pulsation and radial electromagnetic excitation force, and thus reduces vibration noise.

[0057] Among them, the single-side arc cutting area of ​​the tooth top accounts for 2%-12% of the total tooth top area, but it cannot change the widest distance of the tooth top.

[0058] Furthermore, arc portions 212 are provided on both sides of the tooth top. That is, providing arc portions 212 on both sides of the tooth top of the stator tooth portion 211 can further reduce the harmonic amplitude, reduce torque pulsation and radial electromagnetic excitation force, and further reduce vibration noise.

[0059] Among them, multiple stator teeth 211 are all provided with arc portions 212. That is to say, each stator tooth 211 of the stator lamination 21 is provided with an arc portion 212, and such a configuration can further reduce the harmonic amplitude, reduce torque pulsation and radial electromagnetic excitation force, and further reduce vibration noise.

[0060] Alternatively, some of the multiple stator teeth 211 are provided with arc-shaped portions 212. That is, some of the multiple stator teeth 211 are selected to be shaved. Specifically, every 1-9 stator teeth 211 are shaved at even intervals on both sides, or every 1-9 stator teeth 211 are shaved at even intervals on one side, or every 1-9 stator teeth 211 are shaved at uneven intervals on both sides, or every 1-9 stator teeth 211 are shaved at uneven intervals on one side.

[0061] In this way, by performing arc cutting treatment on the side of the tooth top of the stator tooth portion 211, the air gap magnetic flux distribution of the stator body 20 can be improved, the harmonic amplitude can be reduced, the torque pulsation and radial electromagnetic excitation force can be reduced, and the vibration noise of the motor can be reduced from the source.

[0062] Furthermore, the stator core may be made of high magnetic permeability silicon steel sheets, or high strength silicon steel sheets, or amorphous composite materials, or SMC materials.

[0063] If the stator body 20 is made of amorphous material, the thickness of the amorphous thin strip is less than 0.05mm, so it needs to be compounded and processed to form an iron core. Considering the problem that the outer diameter is too large and difficult to stamp, it is necessary to compound at least two layers of amorphous thin strips to form an amorphous stator lamination with a thickness of Ls. The stacking coefficient of the amorphous stator lamination is the ratio of Ls to the stator outer diameter Ds. In this way, the stacking coefficient should be set between 0.19‰-1.68‰ to ensure that the amorphous stator lamination will not have problems such as adhesion and warping, thereby improving the yield rate.

[0064] The motor according to the third aspect of the present invention includes: a stator assembly 100 and a rotor assembly, and the rotor assembly is fitted in the inner wall of the stator assembly 100. In this way, through the structural design of the stator jacket 10 and the structural design of the stator lamination 21, double combination vibration suppression and noise reduction are performed from two paths to achieve vibration suppression and noise reduction, and the tooth top arc cutting is beneficial to the air gap magnetic flux distribution, reduces the harmonic amplitude, reduces the torque pulsation and radial electromagnetic excitation force, and thus reduces the vibration noise.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0067] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator sheath, characterized in that: include: A vibration-damping bracket, wherein the vibration-damping bracket is sleeved on the outer periphery of the stator body and is provided with a plurality of matching grooves; A plurality of sound absorbing members, wherein the plurality of sound absorbing members are respectively arranged in the plurality of matching grooves, and together with the vibration-damping bracket form a receiving space wrapped around the outer periphery of the stator body, and the sound absorbing members have interconnected micropores or gaps therein; Wherein, the sound absorbing component and the vibration-damping bracket are made of different materials.

2. The stator sheath according to claim 1, characterized in that: The vibration-damping bracket includes: two ring parts and multiple connecting parts, the two ring parts are respectively arranged at both ends of the multiple connecting parts, the multiple connecting parts are arranged between the two ring parts at intervals, and the matching groove is formed between any two adjacent connecting parts and the two ring parts.

3. The stator sheath according to claim 2, characterized in that: The connecting portion is arranged obliquely relative to the ring portion.

4. The stator sheath according to claim 3, characterized in that: The angle between the connecting portion and the ring portion is θ, and θ satisfies the relationship: 45°≤θ≤135°.

5. The stator sheath according to claim 2, characterized in that: The thickness of the ring portion is w1, the diameter of the stator body is d, and w1 and d satisfy the relationship: 0.027≤w1 / d≤0.

207.

6. The stator sheath according to claim 5, characterized in that: The thickness of the sound absorbing member is w3, and the relationship between w3 and w1 is: w3≤w1.

7. The stator sheath according to claim 2, characterized in that: The width of the connecting portion is w2, the number of the connecting portions is n, and w2 and n satisfy the relationship: 0.1≤w2 / n≤10.

8. The stator sheath according to claim 1, characterized in that: The vibration-damping bracket is made of one or more of alloy materials, composite materials, foam metal materials, and porous ceramic materials.

9. The stator sheath according to claim 1, characterized in that: The sound absorbing element is made of one or more of aerogel material, polyurethane material, polyester material and rubber material.

10. A stator assembly, characterized in that: include: A stator body, wherein the stator body is composed of a plurality of stator laminations stacked in the axial direction; The stator sheath according to any one of claims 1 to 9 is sleeved on the outer circumference of the stator body.

11. The stator assembly according to claim 10, characterized in that A plurality of stator teeth are circumferentially arranged on the inner wall of each stator lamination, a side of the stator tooth away from the inner wall of the stator lamination is a tooth top, and a side surface of the tooth top is provided with an arc portion.

12. The stator assembly according to claim 11, characterized in that One side of the tooth top is arranged on the arc-shaped portion; Alternatively, the arc-shaped portion is provided on both sides of the tooth top.

13. The stator assembly according to claim 11, characterized in that A plurality of stator teeth are all provided with the arc-shaped portion; or, Some of the plurality of stator teeth are provided with the arc-shaped portion.

14. The stator assembly according to claim 10, characterized in that The stator laminations are made of amorphous material, and are formed by compounding at least two layers of amorphous thin strips.

15. The stator assembly according to claim 14, characterized in that The thickness of the stator lamination is Ls, the outer diameter of the stator lamination is Ds, and the stacking coefficient of the stator lamination is a, and a satisfies the relationship: 0.19‰≤a=Ls / Ds≤1.68‰.

16. A motor, characterized in that: include: The stator assembly according to any one of claims 10 to 15; A rotor assembly is fitted into the inner wall of the stator assembly.

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