Compressing and fixing structure of stator assembly and motor

Abstract

The utility model relates to a stator assembly compressing and fixing structure and a motor, the stator assembly is compressed and fixed in a motor shell through the compressing and fixing structure, a sinking table is further arranged in the motor shell, the height of the sinking table in the axial direction of the stator assembly is not smaller than the height of a stator iron core, and the compressing and fixing structure comprises a stator pressing plate and a locking bolt. A plurality of groups of stator pressing plates and locking bolts are arranged; the stator pressing plate comprises a fixing part and an abutting part, the fixing part is arranged on the sinking table through a locking bolt, the abutting part is connected with the fixing part and is bent in the direction close to the limiting structure relative to the fixing part, the abutting part abuts against the stator iron core, and the abutting part is elastically arranged. According to the invention, the material used for pressing and fixing the structure can be reduced, so that the cost is reduced, and the stator assembly can be pre-pressed and fixed after the assembly is completed, so that the stator assembly is not liable to generate axial movement; and the problem of NVH (Noise Vibration and Harshness) performance deterioration caused by rigid contact between the stator pressing plate and the stator iron core can be avoided when the trend of axial movement is generated.

Description

Technical Field

[0001] The present application relates to the technical field of stator assemblies, and in particular to a compression and fixing structure of a stator assembly and a motor. Background Art

[0002] The motor includes a motor housing and a stator assembly fixed in the motor housing. In order to improve the stability of the stator assembly in the motor housing and prevent the stator assembly from moving in the motor housing, a clamping and fixing structure for limiting the stator assembly may be provided in the motor housing. The clamping and fixing structure of the stator assembly in the prior art is usually an annular pressure plate detachably arranged in the motor housing, and the annular pressure ring abuts against the stator core of the stator assembly to limit the stator assembly. However, the annular pressure plate is usually made of steel to ensure the structural strength and rigidity of the annular pressure plate, and the material used is relatively large, and the cost is relatively high. At the same time, the annular pressure plate and the stator core are in rigid contact, which is not conducive to improving the NVH performance of the motor. Utility Model Content

[0003] Based on this, the present application provides a clamping and fixing structure of a stator assembly and a motor to improve the problems in the prior art that the clamping and fixing structure uses more materials, has higher costs and is not conducive to improving the NVH performance of the motor.

[0004] In a first aspect, the present application provides a compression and fixing structure of a stator assembly, wherein the compression and fixing structure compresses and fixes the stator assembly in a motor housing, wherein a limiting structure is arranged in the motor housing, and the stator assembly is compressed and fixed on the limiting structure, wherein the stator assembly comprises a stator core, and a sink is further arranged in the motor housing, wherein the height of the sink along the axial direction of the stator assembly is not less than the height of the stator core, and the compression and fixing structure comprises a stator pressure plate and a locking bolt, wherein the stator pressure plate and the locking bolt are arranged in a plurality of groups at equal intervals along the circumference of the stator assembly;

[0005] Among them, the stator pressure plate includes a fixing portion and an abutting portion, the fixing portion is arranged on the sinking platform through the locking bolt, the abutting portion is connected to the fixing portion, and is bent relative to the fixing portion in a direction close to the limiting structure, the abutting portion abuts against one end of the stator core away from the limiting structure, and the abutting portion is elastically arranged to pre-compress and fix the stator core.

[0006] In one of the embodiments, the height of the sinker along the axial direction of the stator assembly is greater than the height of the stator core, and the fixing portion is in surface contact with the sinker.

[0007] In one of the embodiments, the stator pressure plate further includes a warping portion, which is disposed on a side of the abutting portion away from the fixing portion and is bent relative to the abutting portion in a direction away from the limiting structure.

[0008] In one embodiment, the width of the warped portion is greater than the width of the fixed portion, and the abutting portion is a gradual structure arranged between the warped portion and the fixed portion.

[0009] In one embodiment, the fixing portion, the abutting portion and the warping portion are integrally formed.

[0010] In one of the embodiments, the stator pressure plate is made of steel.

[0011] In one of the embodiments, a convex rib is provided on the motor housing, and the convex rib is formed by a side wall of the motor housing protruding in a direction away from the axis of the motor housing, and the sink is the bottom of the convex rib.

[0012] In one of the embodiments, a slot is provided on the sinking platform, and the fixing portion is provided in the slot.

[0013] In one embodiment, the stator assembly also includes a stator winding, the stator core is provided with stator slots, the stator slots are arranged along the radial direction of the stator core and are arranged on the inner side of the stator core, the stator winding is wound on the stator core and is partially arranged in the stator slots, and the distance between the side of the stator pressure plate close to the axis of the stator assembly and the outer side of the stator core is 0.3-0.7 times the distance between the bottom of the stator slot and the outer side of the stator core.

[0014] In a second aspect, the present application provides a motor, comprising a compression and fixing structure of any one of the stator assemblies provided in the present application.

[0015] The present application can reduce the materials used in the clamping and fixing structure by setting the clamping and fixing structure of the stator assembly as a plurality of groups of stator clamps and locking bolts arranged at equal intervals along the circumferential direction, thereby reducing costs. At the same time, the present application also sets the stator clamp as a fixing portion connected to the sink, and an abutting portion elastically arranged and abutting against the stator core, which can not only pre-press and fix the stator assembly when the assembly is completed to prevent it from axial movement; but also avoid the problem of NVH performance deterioration caused by rigid contact between the stator clamp and the stator core even when the stator assembly has a tendency to produce axial movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of the compression and fixing structure of the stator assembly provided in the first embodiment of the present application;

[0017] Figure 2 A longitudinal cross-sectional view of the compression and fixing structure of the stator assembly provided in the first embodiment of the present application;

[0018] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0019] Figure 4 A schematic structural diagram of a stator pressure plate of a compression and fixing structure of a stator assembly provided in Embodiment 1 of the present application;

[0020] Figure 5 A schematic diagram of the partial structure of the clamping and fixing structure of the stator assembly provided in the first embodiment of the present application at the convex rib.

[0021] Attached figures: 100, stator pressure plate; 110, fixing portion; 120, abutting portion; 130, lifting portion; 200, locking bolt; 300, stator assembly; 310, stator core; 320, stator winding; 330, stator slot; 400, motor housing; 410, limiting structure; 420, sinking platform; 430, convex rib; 440, slot. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0024] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0025] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] Embodiment 1

[0027] The first embodiment of the present application provides a compression and fixing structure of a stator assembly, wherein the compression and fixing structure compresses and fixes the stator assembly 300 in a motor housing 400, wherein a limiting structure 410 is arranged in the motor housing 400, and the stator assembly 300 is compressed and fixed on the limiting structure 410, wherein the stator assembly 300 includes a stator core 310, and a sink 420 is further arranged in the motor housing 400, wherein the height of the sink 420 along the axial direction of the stator assembly 300 is not less than the height of the stator core 310, and the compression and fixing structure includes a stator pressure plate 100 and a locking bolt 200, wherein the stator pressure plate 100 and the locking bolt 200 are arranged in a plurality of groups at equal intervals along the circumferential direction of the stator assembly 300;

[0028] Among them, the stator pressure plate 100 includes a fixing portion 110 and an abutting portion 120. The fixing portion 110 is set on the sinker 420 through a locking bolt 200. The abutting portion 120 is connected to the fixing portion 110, and is bent relative to the fixing portion 110 in a direction close to the limiting structure 410. The abutting portion 120 abuts against one end of the stator core 310 away from the limiting structure 410. The abutting portion 120 is elastically arranged to pre-press and fix the stator core 310.

[0029] like Figure 1 and Figure 2 As shown, in this embodiment, the motor housing 400 can be set to be cylindrical, and it can be set to cast aluminum material, so that the motor housing 400 has high strength and light weight. The limiting structure 410 can be set at the bottom of the motor housing 400, which can be a step set on the inside of the motor housing 400. The limiting structure 410 can be integrally formed with the motor housing 400 to facilitate preparation and processing.

[0030] The stator assembly 300 is arranged in the motor housing 400, and the stator assembly 300 includes a stator core 310. The stator core 310 can be formed by stacking a number of punching sheets, and can be set as a hollow cylindrical structure. When the stator assembly 300 is arranged in the motor housing 400, the outer side of the stator core 310 abuts against the inner side of the motor housing 400. The stator core 310 and the motor housing 400 can adopt an interference fit to improve the stability of the stator assembly 300 in the motor housing 400. The bottom of the stator core 310 can abut on the limiting structure 410 to limit the axial movement of the stator core 310 through the limiting structure 410.

[0031] Of course, in some embodiments, the limiting structure 410 may also be a limiting plate or other structure that is detachably disposed in the motor housing 400 .

[0032] like Figure 2 and Figure 3 As shown, the bottom of the stator core 310 can be limited by a clamping and fixing structure, and the clamping and fixing structure clamps and fixes the stator assembly 300 on the limiting structure 410. The clamping and fixing structure can be arranged in several groups at equal intervals along the circumference of the stator assembly 300. This embodiment specifically takes three groups of clamping and fixing structures as an example for explanation. The clamping and fixing structure includes a stator pressure plate 100 and a locking bolt 200. The stator pressure plate 100 is fixed to the sinker 420 of the motor housing 400 by the locking bolt 200. The sinker 420 can be arranged at the top of the motor housing 400, and can be arranged one by one with the clamping and fixing structure. Along the axial direction of the stator assembly 300, the height of the sinker 420 is not less than the height of the stator core 310.

[0033] like Figure 3 and Figure 4As shown, the stator pressure plate 100 may include a fixing portion 110 and an abutting portion 120, wherein the fixing portion 110 may be used to set the stator pressure plate 100 on the sinking platform 420, the fixing portion 110 abuts against the sinking platform 420, the rod of the locking bolt 200 may pass through the fixing portion 110 and be threadedly connected in the sinking platform 420; the head of the locking bolt 200 may lock and fix the fixing portion 110 on the sinking platform 420. The abutting portion 120 is connected to the fixing portion 110, and the abutting portion 120 may abut against the top of the stator core 310, that is, the end of the stator core 310 away from the limiting structure 410. When the abutting portion 120 is connected to the fixing portion 110, the abutting portion 120 is bent relative to the fixing portion 110 in the direction close to the limiting structure 410, that is, the abutting portion 120 is bent downward. When bent, the connection between the abutting portion 120 and the fixing portion 110 can be rounded. At the same time, the abutting portion 120 is elastically arranged so that the stator core 310 is pre-pressed and fixed when the abutting portion 120 abuts against the stator core 310, and the abutting portion 120 has a certain elastic deformation at this time. When the stator assembly 300 has a tendency to generate axial movement, the stator assembly 300 will cause the abutting portion 120 to further deform, and the pressing force of the abutting portion 120 on the stator assembly 300 is further increased to prevent the stator assembly 300 from generating axial movement.

[0034] It is understandable that the present application can reduce the materials used in the clamping and fixing structure to reduce costs by setting the clamping and fixing structure of the stator assembly as a plurality of groups of stator pressure plates 100 and locking bolts 200 arranged at equal intervals along the circumferential direction. At the same time, the present application also sets the stator pressure plate 100 as a fixing portion 110 connected to the sink 420, and an abutting portion 120 elastically arranged and abutting against the stator core 310, which can not only pre-press and fix the stator assembly 300 when the assembly is completed to prevent it from easily moving axially; it can also avoid the problem of NVH performance deterioration caused by rigid contact between the stator pressure plate 100 and the stator core 310 even when the stator assembly 300 has a tendency to move axially.

[0035] Specifically, the height of the sinking platform 420 along the axial direction of the stator assembly 300 is greater than the height of the stator core 310 , and the fixing portion 110 is in surface contact with the sinking platform 420 .

[0036] like Figure 3 As shown, in this embodiment, it is exemplarily explained that along the axial direction of the stator assembly 300, the sinking platform 420 is higher than the top of the stator core 310, and specifically, the sinking platform 420 may be slightly higher than the top of the stator core 310. The fixing portion 110 may be provided with a sheet-like washer structure, which is sleeved on the rod of the locking bolt 200. When the locking bolt 200 locks and fixes the fixing portion 110, the fixing portion 110 and the sinking platform 420 are in a surface-to-surface contact abutment mode.

[0037] It is understandable that when the sinking platform 420 is flush with the bottom height of the stator core 310, since the abutting portion 120 is bent relative to the fixing portion 110, the abutting portion 120 and the stator core 310 will inevitably cause the fixing portion 110 to be arranged on the sinking platform 420 at an angle and fail to contact the sinking platform 420 well. In this embodiment, the height of the sinking platform 420 is set relatively high, so that the fixing portion 110 and the sinking platform 420 have a larger contact area, which is conducive to ensuring the stability of the fixing portion 110 set on the sinking platform 420.

[0038] More specifically, the stator pressure plate 100 further includes a warping portion 130 , which is disposed on a side of the abutting portion 120 away from the fixing portion 110 , and is bent relative to the fixing portion 110 in a direction away from the limiting structure 410 .

[0039] like Figure 3 and Figure 4 As shown, in this embodiment, the tilting portion 130 and the fixing portion 110 can be respectively arranged on both sides of the abutting portion 120. The tilting portion 130 can be bent relative to the abutting portion 120 in a direction away from the limiting structure 410, that is, the tilting portion 130 is bent upward relative to the abutting portion 120. When bent, the connection between the tilting portion 130 and the abutting portion 120 can also be rounded. When the abutting portion 120 abuts against the stator core 310, the abutting position between the tilting portion 130 and the abutting portion 120 is close to the connection between the tilting portion 130 and the abutting portion 120.

[0040] It can be understood that, by providing the raised portion 130, this embodiment can avoid the presence of sharp and pointed parts on the abutting portion 120 abutting against the stator core 310 and causing scratches and wear on the stator core 310, and at the same time can make the stator pressure plate 100 less susceptible to damage, thereby ensuring the durability of the stator pressure plate 100 during use.

[0041] More specifically, the width of the tilted portion 130 is greater than the width of the fixed portion 110 , and the abutting portion 120 is a gradual structure disposed between the tilted portion 130 and the fixed portion 110 .

[0042] like Figure 3 and Figure 4As shown, in this embodiment, it is exemplified that when looking down at the stator pressure plate 100 along the axial direction of the stator assembly 300, the stator pressure plate 100 can be set to a fan-like shape, and the fan-shaped circle of the stator pressure plate 100 can be regarded as the position of the side of the fixed portion 110 away from the abutment portion 120. In other words, the side of the fixed portion 110 away from the abutment portion 120 can be set to a semicircle, and the side of the fixed portion 110 close to the abutment portion 120 can be set to a rectangle; the rod of the locking bolt 200 can pass through the center of the semicircle of the fixed portion 110. The warping portion 130 can be set to a long strip, and the warping portion 130 can be set tangent to a concentric circle of the end face of the stator assembly 300. The abutment portion 120 can be set to a gradual structure connected between the rectangle of the fixed portion 110 and the warping portion 130, and its two sides can be set to an inner fillet shape.

[0043] It can be understood that, by reasonably arranging the shapes of the various structural parts of the stator pressure plate 100 in this embodiment, the contact area when the stator pressure plate 100 is connected to the motor housing 400 can be smaller, while the contact area when the stator pressure plate 100 is connected to the rotor core can be larger, thereby arranging the stator pressure plate 100 through a smaller area of ​​the sinker 420, and at the same time ensuring the effect of the stator pressure plate 100 to press and fix the stator assembly 300.

[0044] More specifically, the fixing portion 110 , the abutting portion 120 and the lifting portion 130 are integrally formed.

[0045] like Figure 3 and Figure 4 As shown, in this embodiment, the stator pressing plate 100 can be provided as a stamping part, so that the fixing portion 110, the abutting portion 120 and the warping portion 130 can be integrally formed. It is not difficult to understand that when the fixing portion 110, the abutting portion 120 and the warping portion 130 are integrally formed, the stator pressing plate 100 has a relatively simple preparation process and a relatively stable structure.

[0046] Specifically, the stator pressing plate 100 is made of steel.

[0047] In this embodiment, for example, the material of the stator pressure plate 100 can be spring steel, and the grade can be 65Mn, which has the advantages of high strength, good toughness, and low cost, and can better meet the requirements of the stator pressure plate 100 to pre-press and fix the stator assembly 300 and prevent the stator assembly 300 from moving.

[0048] Specifically, a convex rib 430 is provided on the motor housing 400 . The convex rib 430 is formed by the side wall of the motor housing 400 protruding in a direction away from the axis of the motor housing 400 . The sink 420 is the bottom of the convex rib 430 .

[0049] like Figure 1 and Figure 5 As shown, in this embodiment, the side wall of the motor housing 400 can be set to a relatively uniform wall thickness; and at the sinker 420, due to the need to arrange the locking bolt 200, the side wall of the motor housing 400 needs to be protruded outward, that is, the side wall of the motor housing 400 is away from the axis of the motor housing 400. When the side wall portion of the motor housing 400 protrudes outward, the position where the motor housing 400 protrudes outward is formed with a sinker 420, and the sinker 420 is located at the bottom of the rib 430. During the casting process of the motor housing 400, the rib 430 and the sinker 420 can be integrally cast with the motor housing 400. After the sinker 420 is formed, the sinker 420 can be used to arrange the locking bolt 200 by machining the threaded hole of the sinker 420.

[0050] It is understandable that this embodiment provides ribs 430 on the side walls of the motor housing 400 to facilitate the formation of the sinker 420 during the casting process of the motor housing 400, thereby reducing the difficulty of the preparation process of the sinker 420 and making it more convenient.

[0051] Specifically, a slot 440 is provided on the sink 420 , and the fixing portion 110 is disposed in the slot 440 .

[0052] like Figure 3 and Figure 5 As shown, in this embodiment, the shape of the slot 440 can be similar to the shape of the fixing portion 110, and the size of the slot 440 can be slightly larger than the size of the outer edge of the fixing portion 110. The slot 440 can be formed by machining the step surface of the sink 420, and its height can be greater than the thickness of the fixing portion 110. When the fixing portion 110 is fixed to the sink 420 by the locking bolt 200, the fixing portion 110 is located in the slot 440.

[0053] It can be understood that, in this embodiment, by providing a card slot 440, the fixing portion 110 can be limited by the card slot 440 to improve the accuracy of the position of the stator pressure plate 100 when it is installed on the sink 420, thereby further improving the effect of the stator pressure plate 100 on pressing and fixing the stator assembly 300.

[0054] Specifically, the stator assembly 300 also includes a stator winding 320, and a stator slot 330 is arranged on the stator core 310. The stator slot 330 is arranged along the radial direction of the stator core 310 and is arranged on the inner side of the stator core 310. The stator winding 320 is wound on the stator core 310 and is partially arranged in the stator slot 330. The distance between the stator pressure plate 100 close to the axis of the stator assembly 300 and the outer side of the stator core 310 is 0.3-0.7 times the distance between the bottom of the stator slot 330 and the outer side of the stator core 310.

[0055] like Figure 3 As shown, in this embodiment, it is exemplarily explained that the stator slot 330 is arranged along the axial direction of the stator core 310 and penetrates the stator core 310. A plurality of stator slots 330 may be arranged at equal intervals along the circumferential direction of the stator core 310, and the plurality of stator slots 330 are arranged on the inner side of the stator core 310. The stator winding 320 may be wound by a plurality of stator coils, the middle of the stator winding 320 is arranged in the stator slot 330, and the two ends of the stator winding 320 are arranged outside the two ends of the stator core 310. When the stator pressing plate 100 abuts against the stator core 310, the stator pressing plate 100 should be spaced apart from the stator winding 320 to prevent the stator pressing plate 100 from scratching the stator winding 320 and causing the circuit structure of the stator winding 320 to short-circuit. The distance between the stator pressure plate 100 and the stator winding 320 should be appropriate. If the distance is too small, the risk of scratching increases; if the distance is too large, the effect of pressing and fixing the stator assembly 300 is poor. The distance between the bottom of the stator slot 330 and the stator core 310 can be set to L, and the distance between the side of the stator pressure plate 100 close to the stator assembly 300 (in this embodiment, the side of the warping portion 130 away from the abutting portion 120) and the outer side of the stator core 310 can be 0.3-0.7L.

[0056] It can be understood that this embodiment can ensure the effect of the stator pressure plate 100 to press and fix the stator assembly 300 by reasonably setting the distance between the stator pressure plate and the stator winding 320, while avoiding the stator pressure plate 100 from scratching the stator winding 320 and causing a short circuit in the circuit structure of the stator winding 320.

[0057] The implementation principle of a stator assembly compression and fixing structure provided in the first embodiment of the present application is:

[0058] During assembly, the stator assembly 300 is assembled in the motor housing 400, and the bottom of the stator core 310 is abutted against the limiting structure 410 in the motor housing 400. Then, several groups of stator pressure plates 100 and locking bolts 200 are arranged in the motor housing 400 at equal intervals along the circumferential direction. During arrangement, the rod of the locking bolt 200 is passed through the fixing portion 110 of the stator pressure plate 100 and is threadedly connected to the sink 420. Then, the fixing portion 110 is placed in the slot 440 on the sink 420, and the locking bolt 200 is tightened to lock and fix the fixing portion 110 on the sink 420 through the locking bolt 200. When locked and fixed, the bottom of the fixing portion 110 is in surface contact with the sink 420 , the abutting portion 120 abuts against the top of the stator core 310 , and the abutting portion 120 is compressed and deformed to pre-press and fix the stator core 310 on the limiting structure 410 .

[0059] The present application can reduce the materials used in the clamping and fixing structure by setting the clamping and fixing structure of the stator assembly as a plurality of groups of stator pressure plates 100 and locking bolts 200 arranged at equal intervals along the circumferential direction, thereby reducing the cost. At the same time, the present application also sets the stator pressure plate 100 as a fixing portion 110 connected to the sink 420, and an abutting portion 120 elastically arranged and abutting against the stator core 310, which can not only pre-press and fix the stator assembly 300 when the assembly is completed to prevent it from easily moving axially, but also avoid the problem of NVH performance deterioration caused by rigid contact between the stator pressure plate 100 and the stator core 310 even when the stator assembly 300 has a tendency to move axially.

[0060] Embodiment 2

[0061] Embodiment 2 of the present application provides a motor, which includes a compression and fixing structure of any stator assembly provided in the present application.

[0062] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A compression and fixing structure for a stator assembly, wherein the compression and fixing structure compresses and fixes the stator assembly (300) in a motor housing (400), wherein a limiting structure (410) is arranged in the motor housing (400), and the stator assembly (300) is compressed and fixed on the limiting structure (410), characterized in that: The stator assembly (300) comprises a stator core (310), a sink (420) is further arranged in the motor housing (400), the height of the sink (420) along the axial direction of the stator assembly (300) is not less than the height of the stator core (310), the clamping and fixing structure comprises a stator pressure plate (100) and locking bolts (200), and a plurality of groups of the stator pressure plate (100) and the locking bolts (200) are arranged at equal intervals along the circumference of the stator assembly (300); The stator pressure plate (100) comprises a fixing portion (110) and an abutting portion (120); the fixing portion (110) is arranged on the sink (420) through the locking bolt (200); the abutting portion (120) is connected to the fixing portion (110) and is bent relative to the fixing portion (110) in a direction close to the limiting structure (410); the abutting portion (120) abuts against an end of the stator core (310) away from the limiting structure (410); and the abutting portion (120) is elastically arranged to pre-press and fix the stator core (310).

2. The compression and fixing structure of the stator assembly according to claim 1, characterized in that: The height of the sinking platform (420) along the axial direction of the stator assembly (300) is greater than the height of the stator core (310), and the fixing portion (110) and the sinking platform (420) are in surface contact.

3. The compression and fixing structure of the stator assembly according to claim 1 or 2, characterized in that: The stator pressure plate (100) further comprises a warping portion (130), wherein the warping portion (130) is arranged on a side of the abutting portion (120) away from the fixing portion (110), and is bent relative to the abutting portion (120) in a direction away from the limiting structure (410).

4. The compression and fixing structure of the stator assembly according to claim 3, characterized in that: The width of the warping portion (130) is greater than the width of the fixing portion (110), and the abutting portion (120) is a gradual structure arranged between the warping portion (130) and the fixing portion (110).

5. The compression and fixing structure of the stator assembly according to claim 3, characterized in that: The fixing portion (110), the abutting portion (120) and the lifting portion (130) are integrally formed.

6. The compression and fixing structure of the stator assembly according to claim 1, characterized in that: The stator pressing plate (100) is made of steel.

7. The compression and fixing structure of the stator assembly according to claim 1, characterized in that: The motor housing (400) is provided with a convex rib (430), the convex rib (430) being formed by the side wall of the motor housing (400) protruding in a direction away from the axis of the motor housing (400), and the sink (420) being the bottom of the convex rib (430).

8. The stator assembly pressing and fixing structure according to claim 1, characterized in that: The sink (420) is provided with a slot (440), and the fixing portion (110) is arranged in the slot (440).

9. The stator assembly pressing and fixing structure according to claim 1, characterized in that: The stator assembly (300) further comprises a stator winding (320); a stator slot (330) is arranged on the stator core (310); the stator slot (330) is arranged along the radial direction of the stator core (310) and is arranged on the inner side of the stator core (310); the stator winding (320) is wound on the stator core (310) and is partially arranged in the stator slot (330); and the distance between the stator pressure plate (100) on one side close to the axis of the stator assembly (300) and the outer side of the stator core (310) is 0.3-0.7 times the distance between the bottom of the stator slot (330) and the outer side of the stator core (310).

10. A motor, characterized in that: The motor comprises a compression fixing structure of a stator assembly as claimed in any one of claims 1 to 9.

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