Stator core strip, stator assembly, motor and cleaning equipment

Abstract

The utility model discloses a stator core strip, a stator assembly, a motor and cleaning equipment, and belongs to the technical field of cleaning equipment. The stator core strip comprises a stator yoke and stator teeth; the stator yoke comprises a plurality of yoke parts which are connected in sequence, and a connecting part is connected between every two adjacent yoke parts; the stator teeth comprise a plurality of tooth parts extending towards the inner side of the stator yoke, and the tooth parts are arranged on the inner side wall of the yoke part; wherein the inner surface and the outer surface of the connecting part are bent towards the outer side of the stator yoke, the bending degree of the inner surface of the connecting part is larger than that of the outer surface, and the thickness of the middle area of the connecting part is smaller than that of the areas on the two sides of the connecting part. According to the stator core strip, the stator assembly, the motor and the cleaning equipment provided by the invention, through the design of curvature difference and thickness distribution of the inner and outer surfaces of the connecting part of the stator yoke, the problem of non-uniform roundness of the stator core strip after edge rolling caused by non-concentrated stress is avoided.

Description

Technical Field

[0001] This application belongs to the field of cleaning equipment technology, specifically relating to a stator core bar, stator assembly, motor and cleaning equipment. Background Technology

[0002] As a crucial component of an electric motor, the stator core's structural design plays a vital role in the motor's performance, efficiency, and stability. In miniaturized, high-performance equipment such as vacuum cleaners and fans, the stator core typically requires high power density and assembly precision to meet the equipment's demands for lightweight design, high efficiency, and low noise. Currently, most commercially available stator cores are in the form of stator bars, formed by rolling multiple straight strips connected by yokes and teeth into a ring shape.

[0003] In existing technologies, stator bars are typically composed of multiple sequentially connected yokes, with adjacent yokes linked by connecting parts. However, during the process of rolling the stator bars into a ring-shaped stator core, the limitations of the existing connecting part structure design lead to uneven stress distribution during rolling, preventing stress from being effectively concentrated at the optimal position of the connecting part. This results in inconsistent deformation between the yokes and uneven roundness of the stator core.

[0004] Furthermore, uneven roundness can be amplified during subsequent assembly. For example, when the stator core mates with the rotor assembly or other housing components of the motor, insufficient assembly precision can lead to uneven gaps, or even assembly difficulties or increased vibration during operation. These problems not only reduce the motor's operational stability but can also increase electromagnetic noise, impacting the user experience.

[0005] Therefore, it is necessary to provide a new solution to the above-mentioned technical problems. Utility Model Content

[0006] The purpose of this application is to provide a stator core bar, a stator assembly, a motor, and a cleaning device, which can ensure consistent deformation and uniform roundness of the stator core bar during the rolling process, thereby improving the stability of motor operation and reducing electromagnetic noise.

[0007] To achieve the above objectives, the technical solution provided in this application is as follows:

[0008] In a first aspect, this application provides a stator core bar, comprising: a stator yoke and stator teeth; the stator yoke includes a plurality of yoke portions connected in sequence, with a connecting portion connecting adjacent two yoke portions; the stator teeth include a plurality of teeth extending toward the inner side of the stator yoke, the teeth being disposed on the inner sidewall of the yoke portion; wherein, the inner surface and outer surface of the connecting portion are both curved toward the inner side of the stator yoke, the curvature of the inner surface of the connecting portion is greater than the curvature of the outer surface, and the thickness of the middle region of the connecting portion is less than the thickness of the two side regions.

[0009] In one or more embodiments, the thickness of the connecting portion gradually increases from its central region to both sides.

[0010] In one or more embodiments, on a plane perpendicular to the axis of the stator yoke, the outer and inner edges of the projection of the connecting portion are non-concentric elliptical arcs, and the points with the greatest curvature on the outer and inner edges are located in the middle region of the projection.

[0011] In one or more embodiments, on a plane perpendicular to the axis of the stator yoke, the outer edge of the projection of the connecting portion is arc-shaped, the inner edge is elliptical arc-shaped, and the point with the largest curvature on the inner edge is located in the middle region of the projection.

[0012] In one or more embodiments, on a plane perpendicular to the axis of the stator yoke, the outer edge of the projection of the connecting portion is elliptical and the inner edge is circular, and the point with the greatest curvature on the outer edge is located in the middle region of the projection.

[0013] In one or more embodiments, on a plane perpendicular to the axis of the stator yoke, the outer and inner edges of the projection of the connecting portion are non-concentric arcs, and the line connecting the centers of the outer and inner edges passes through the middle region of the projection.

[0014] In one or more embodiments, a groove for welding solder is formed between the outer surface of the connecting portion and its two adjacent yoke portions.

[0015] In one or more embodiments, the thickness of the connecting portion is between 0.2 and 0.45 mm; and / or when the stator core bars are unfolded into a straight line, the spacing between two adjacent teeth is reduced by 0 to 0.1 mm.

[0016] Secondly, this application provides a stator assembly, which includes: a stator core, an insulating frame, and a winding; the stator core is wound from the aforementioned stator core bar, and a winding groove is formed between two adjacent teeth on the stator core; the insulating frame is disposed on the surface of the stator core; the winding is located in the winding groove and wound around the outer periphery of the insulating frame covering the teeth.

[0017] In one or more embodiments, the insulating frame includes a terminal bracket disposed at the end of the stator core, the terminal bracket having a piercing terminal.

[0018] Thirdly, this application provides an electric motor comprising: a rotor assembly and a stator assembly as described above; the stator assembly is disposed around the outer periphery of the rotor assembly.

[0019] In one or more embodiments, the rotor assembly includes a shaft and a bearing sleeved on the shaft, wherein a glue storage groove is recessed on the outer peripheral surface of the bearing.

[0020] In one or more embodiments, the motor further includes: a housing and an impeller housing having a bearing chamber extending axially; a bearing of the rotor assembly being mounted in the bearing chamber; and an impeller disposed on the front side of the housing, the impeller being axially sleeved around the front end of the rotor assembly shaft of the motor.

[0021] In one or more embodiments, the housing includes an inner cylinder and an outer cylinder surrounding the rear end of the inner cylinder, with a first guide vane provided between the inner cylinder and the outer cylinder.

[0022] In one or more embodiments, the motor further includes a shroud covering the outside of the impeller and the inner cylinder, and a second guide vane is provided between the shroud and the front end of the inner cylinder.

[0023] In one or more embodiments, the housing is provided with a plurality of positioning portions surrounding the outer periphery of the stator assembly of the motor, the positioning portions being interference-fitted with the stator assembly, and the inner surfaces of the plurality of positioning portions forming a cylindrical surface coaxial with the stator assembly.

[0024] In one or more embodiments, a threaded connection portion for screwing into the stator assembly of the motor is provided between two adjacent positioning portions.

[0025] In one or more embodiments, the motor further includes a drive circuit board electrically connected to the stator assembly, the drive circuit board having a heat sink on the side near the stator assembly, and a thermally conductive material between the heat sink and a chip on the drive circuit board.

[0026] Fourthly, this application provides a cleaning device, which includes a device body and a motor as described above, the motor being disposed on the device body.

[0027] The stator core bar, stator assembly, motor, and cleaning equipment provided in this application, through the design of the difference in curvature and thickness distribution of the inner and outer surfaces of the stator yoke connection, control the stress concentration of the stator core bar after rolling to the middle area of ​​the connection, so that the deformation is consistent during the rolling process and the roundness uniformity is improved. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a projection view of the stator core bar along the axial direction in one embodiment of this application;

[0030] Figure 2 As shown in one embodiment of this application Figure 1 Enlarged view of point A in the middle;

[0031] Figure 3 In another embodiment of this application Figure 1 Enlarged view of point A in the middle;

[0032] Figure 4 In another embodiment of this application Figure 1 Enlarged view of point A in the middle;

[0033] Figure 5 In another embodiment of this application Figure 1 Enlarged view of point A in the middle;

[0034] Figure 6 This is a schematic diagram of the stator assembly in one embodiment of this application;

[0035] Figure 7 This is a schematic diagram of the stator core structure in one embodiment of this application;

[0036] Figure 8 This is a schematic diagram of the rotor assembly in one embodiment of this application;

[0037] Figure 9 This is a schematic diagram of the structure of the motor in one embodiment of this application;

[0038] Figure 10 This is an exploded view of the motor in one embodiment of this application;

[0039] Figure 11 This is a cross-sectional view of the motor in one embodiment of this application;

[0040] Figure 12This is a schematic diagram of the shell structure in one embodiment of this application.

[0041] Explanation of key figure labels:

[0042] 1-Stator yoke, 11-Yoke part, 12-Connecting part, 121-Inner edge, 122-Outer edge, 13-Groove, 2-Stator tooth, 21-Tooth part, 3-Stator assembly, 31-Stator core, 32-Insulating frame, 321-Terminal bracket, 33-Winding, 34-Winding groove, 35-Piercing terminal, 4-Rotor assembly, 41-Shaft, 42-Bearing, 421-Glue storage tank, 43-Magnet, 44-Balance ring, 5-Housing, 51-Bearing chamber, 52-Inner cylinder, 53-Outer cylinder, 54-First guide vane, 55-Second guide vane, 56-Positioning part, 57-Screw connection, 6-Impeller, 7-Wind cover, 81-Base, 82-Drive circuit board, 83-Heat sink, 84-Heat dissipation hole. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of this application.

[0044] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0045] With the continuous development of motor technology, the manufacturing precision of the stator core has become one of the important factors affecting motor performance. In the process of winding existing stator core bars into a ring shape, uneven roundness often arises due to stress concentration at the connection points between the yoke sections. This uneven roundness not only affects the geometric accuracy of the stator core, thus impacting the motor's assembly accuracy and operational stability, but also introduces additional mechanical stress during subsequent use, thereby affecting the motor's lifespan and performance.

[0046] Through analysis of existing technologies, the inventors discovered that existing stator bar structures are prone to uneven stress distribution during the rolling process, especially stress concentration at the joints, leading to uneven roundness and inconsistent deformation. Therefore, this application proposes a novel stator bar design that optimizes stress distribution at the joints through a rational geometric design, thereby achieving more uniform deformation and higher roundness accuracy during the stator bar rolling process.

[0047] The main approach of this application is to control stress concentration and distribution by altering the shape and thickness distribution of the connecting part. By bending the inner and outer surfaces of the connecting part towards the outside of the stator yoke, and making the curvature of the inner surface greater than that of the outer surface, stress is concentrated in the central region of the connecting part during the rolling process. This results in more uniform deformation of the connecting part during the rolling of the stator core, effectively improving the roundness of the stator core. Furthermore, this application optimizes the thickness distribution of the connecting part, minimizing the thickness and maximizing the curvature in the central position, further enhancing the stress concentration effect and resulting in a more uniform roundness and improved geometric accuracy of the rolled stator core.

[0048] Please refer to Figures 1 to 5 As shown, in one embodiment of this application, the stator core bar includes a stator yoke 1 and stator teeth 2. The stator yoke 1 includes a plurality of yoke portions 11 connected in sequence, and a connecting portion 12 connects two adjacent yoke portions 11; the stator teeth 2 include a plurality of teeth 21 extending toward the inner side of the stator yoke 1, and the teeth 21 are disposed on the inner sidewall of the yoke portion 11.

[0049] The inner and outer surfaces of the connecting part 12 are both curved toward the outside of the stator yoke 1. The curvature of the inner surface of the connecting part 12 is greater than that of the outer surface, and the thickness of the middle region of the connecting part 12 is less than that of the two side regions.

[0050] The main body of the stator core bar is composed of a stator yoke 1, which is made up of multiple yoke portions 11 connected end to end. These yoke portions 11 are connected to each other by connecting portions 12 to form a continuous chain structure. The stator teeth 2, as extensions of the stator yoke 1, extend inward from the inner wall of the yoke portion 11, presenting multiple tooth-like protrusions. These teeth 21 are parallel to each other and evenly distributed, providing space and support for the subsequent winding installation. Their inward extension direction ensures that the stator core 31 can naturally form a ring structure after being rolled, forming a tight electromagnetic engagement with the rotor assembly 4.

[0051] Both the inner and outer surfaces of the connecting portion 12 exhibit a curvature towards the outside of the stator yoke 1 (the inner and outer surfaces arch outwards towards the outside of the stator yoke 1). The curvature of the inner surface is designed to be greater than that of the outer surface. This design endows the connecting portion 12 with directional guiding capability during deformation. When the stator core bar is subjected to a rolling force, the inner surface, due to its greater curvature, is more prone to deformation, thereby guiding the stress to a specific area of ​​the connecting portion 12. At the same time, the thickness distribution of the connecting portion 12 is such that the thickness of the middle region is less than that of the two side regions. This gradient change in thickness further enhances the stress concentration effect, making the middle region the main deformation point during rolling, while the thicker areas on both sides play a role in stabilizing the connection and ensuring that the relative position between the yoke portions 11 does not become misaligned due to excessive deformation.

[0052] The thickness of the connecting portion 12 gradually increases from its central region towards both sides. The thickness of the connecting portion 12 is designed with a gradient change, gradually increasing from the center to both sides; that is, the thickness is smallest at the very center of the connecting portion 12, and the thickness gradually increases in the regions near the yoke 11 on both sides. The thinner thickness in the central region makes this part more susceptible to deformation under rolling force, while the thicker regions on both sides maintain relatively high rigidity, thus creating stress concentration in the central region of the connecting portion 12.

[0053] Please refer to Figure 2 The embodiment shown has an axis perpendicular to the stator yoke 1 (perpendicular to) Figure 1 On the plane of the drawing page (i.e., the axial direction of the stator yoke 1 in its rolled-up state), the outer edge 122 (projection of the outer surface of the connecting part 12) and the inner edge 121 (projection of the inner surface of the connecting part 12) of the projection of the connecting part 12 along the axial direction of the stator yoke 1 are non-concentric elliptical arcs. Figure 2 The intersection of the perpendicularly intersecting dashed lines is the center of the elliptical arc. The points of maximum curvature on the outer edge 122 and the inner edge 121 are both located in the middle region of the projection. Preferably, the connecting part 12 is configured as a symmetrical structure, such that the points of maximum curvature on the outer edge 122 and the inner edge 121 are both located on the axis of symmetry L1. Having the points of maximum curvature on the outer edge 122 and the inner edge 121 both located on the axis of symmetry L1 of the projection allows for maximum curvature and minimum thickness at the very center of the connecting part 12.

[0054] The elliptical curvature distribution of the outer edge 122 and inner edge 121 of the connecting portion 12 causes the connecting portion 12 to exhibit a gradually changing bending characteristic from the middle to both sides during the rolling process. The outer edge 122 and inner edge 121 adopt a non-concentric elliptical arc structure, resulting in a significant gradient change in the curvature of the connecting portion 12. During the rolling process, since the curvature is greatest and the thickness is smallest in the middle region, the very middle part of the connecting portion 12 will be subjected to strong bending stress, thereby achieving stress concentration at this location.

[0055] Please refer to Figure 3 In the illustrated embodiment, on a plane perpendicular to the axial direction of the stator yoke 1, the outer edge 122 of the projection of the connecting portion 12 along the axial direction of the stator yoke 1 is arc-shaped, and the inner edge 121 is elliptical arc-shaped. The point of maximum curvature on the inner edge 121 is located in the middle region of the projection. Preferably, the connecting portion 12 is configured as a symmetrical structure, such that the point of maximum curvature on the inner edge 121 is located on the axis of symmetry L2. The arc shape of the outer edge 122 is relatively smooth, which can evenly distribute stress during the rolling of the stator core bar, while the inner edge 121 achieves stress concentration through the design of the elliptical arc shape.

[0056] The elliptical shape of the inner edge 121 results in a large curvature in this region, with the point of maximum curvature located on the axis of symmetry L2 of the projection. By maximizing the curvature, the middle region of the connecting portion 12 experiences greater stress, thus achieving uniform deformation during the rolling process. The large curvature of the inner edge 121 minimizes the thickness at the center, concentrating the deformation of the connecting portion 12 in the middle during rolling and preventing excessive deformation in other areas. This ensures a more uniform roundness of the stator core after rolling.

[0057] Please refer to Figure 4 In the illustrated embodiment, on a plane perpendicular to the axis of the stator yoke 1, the outer edge 122 of the projection of the connecting portion 12 along the axis of the stator yoke 1 is elliptical, and the inner edge 121 is circular. The point of maximum curvature on the outer edge 122 is located in the middle region of the projection. Preferably, the connecting portion 12 is configured as a symmetrical structure, such that the point of maximum curvature on the outer edge 122 is located on the axis of symmetry L3. This design, where the point of maximum curvature on the outer edge 122 is located on the axis of symmetry L3 of the projection, results in the maximum stress at the exact center of the connecting portion 12, thereby achieving effective stress concentration.

[0058] The point of maximum curvature on the outer edge 122 is located on the axis of symmetry L3 of the projection, resulting in the minimum thickness in the central region of the connecting part 12, allowing stress to concentrate in this area. During the rolling process, due to the difference in curvature and thickness between the inner and outer edges of the connecting part 12, the deformation of the stator core bar is guided to the central region of the connecting part 12, thereby avoiding unnecessary deformation in the outer region.

[0059] Please refer to Figure 5In the illustrated embodiment, on a plane perpendicular to the axial direction of the stator yoke 1, the outer edge 122 and inner edge 121 of the projection of the connecting portion 12 along the axial direction of the stator yoke 1 are non-concentric arcs, and the line connecting the centers of the outer edge 122 and the inner edge 121 passes through the middle region of the projection. Preferably, the connecting portion 12 is configured with a symmetrical structure such that the centers of the arcs of the outer edge 122 and the inner edge 121 are both located on the axis of symmetry L4. This structure ensures that the thickness at the very center of the connecting portion 12 is minimized during the rolling of the stator core bar. As the rolling process progresses, the difference in curvature between the outer edge 122 and the inner edge 121 leads to stress concentration, causing the stress to gradually concentrate towards the center of the connecting portion 12.

[0060] During the stator core bar rolling process, due to the smaller thickness of the middle region of the connecting part 12, the deformation and stress concentration effects in this region are more significant. Compared to the thicker outer region, the weaker design at the center allows the stress to be concentrated and distributed at the center of the connecting part 12, thereby reducing the deformation pressure in the outer region and improving the uniformity of the stator core bar shape and the rolling accuracy.

[0061] In one exemplary embodiment, a groove 13 for welding solder is formed between the outer surface of the connecting portion 12 and its two adjacent yoke portions 11. The design of the groove 13 allows the solder to better bond with the surfaces of the connecting portion 12 and its adjacent yoke portions 11, contributing to a larger welding area and higher weld strength during the welding process. During welding, the solder not only fills the gaps between the connecting portion 12 and the yoke portions 11, but also enhances the bonding force between the components.

[0062] By welding solder into the groove 13, the stress that the stator core 31 may bear during operation can be dispersed, reducing the damage caused by local stress concentration to the connection part 12, and further improving the overall reliability of the stator core 31. Especially under high load or high temperature environments, the structural reinforcement provided by the welding process can significantly extend the service life of the stator core 31.

[0063] In one exemplary embodiment, the thickness h of the connecting portion 12 is between 0.2 and 0.45 mm. When the stator core bars are unfolded into a straight line, the distance d between two adjacent teeth 21 is reduced by 0 to 0.1 mm. The distance d can be set according to design requirements, for example, it can be 18.44 mm.

[0064] The thickness of the connecting portion 12 is set between 0.2 mm and 0.45 mm to ensure that it can fully withstand stress and effectively distribute pressure during the rolling and assembly of the stator core. A connecting portion 12 that is too thin may result in insufficient connection strength, thereby affecting the overall stability of the stator core; while a connecting portion 12 that is too thick may make it difficult to concentrate stress and affect the roundness and assembly accuracy of the stator core.

[0065] During the stator core bar rolling process, the stator core bar may not be able to close completely due to material elasticity, machining tolerances, or deformation deviations. By machining the distance d between two adjacent teeth 21 to be reduced by 0 to 0.1 mm compared to the preset size (design drawing size), it can be ensured that the stator core bar connection is completely engaged after rolling, and there will be no splicing gap after rolling, avoiding leakage flux loss, performance degradation, and electromagnetic noise.

[0066] Please refer to Figure 6 and Figure 7 As shown, this application also relates to a stator assembly 3, which includes a stator core 31, an insulating frame 32, and a winding 33. The stator core 31 is formed by winding the aforementioned stator core bar, and a winding groove 34 is formed between two adjacent teeth 21 on the stator core 31. The insulating frame 32 is disposed on the surface of the stator core 31; the winding 33 is located in the winding groove 34 and is wound around the outer periphery of the insulating frame 32 covering the teeth 21.

[0067] The main body of the stator assembly 3 is the stator core 31, which is made from the aforementioned stator core bar through a winding process to form a ring structure. After the stator core bar is wound into the stator core 31, a winding groove 34 is formed between two adjacent teeth 21 on the stator core 31. The winding groove 34 serves as the receiving area for the winding 33, and its uniformly distributed geometry provides space for the winding process. Closely attached to the surface of the stator core 31 is the insulating skeleton 32. This component covers the outer surface of the core in a plastic coating manner, forming an insulating protective layer and a supporting structure. The insulating skeleton 32 extends to the tooth 21 area, providing a carrier for the winding of the winding 33. The winding 33 is located in the winding groove 34 and is wound around the outer periphery of the insulating skeleton 32 covering the teeth 21, forming a closed electromagnetic circuit, which works in conjunction with the rotor assembly 4 to generate driving force.

[0068] In one exemplary embodiment, please refer to Figure 6 As shown, the insulating frame 32 includes a terminal bracket 321 disposed at the end of the stator core 31, and the terminal bracket 321 is provided with a piercing terminal 35. The terminal bracket 321 is an extension of the insulating frame 32, located on the axial end face of the stator core 31, and is integrally connected with the main structure of the stator core 31.

[0069] The terminal bracket 321 is fitted with piercing terminals 35, which are arranged in specific positions and orientations and extend to the outside through the terminal bracket 321 for mating with the drive circuit board 82. The piercing terminals 35 complete the interaction between the stator assembly 3 and the external circuitry through electrical connection with the drive circuit board 82. The drive circuit board 82 controls the operating state of the stator winding 33 by receiving signals and providing power, thereby regulating the operation of the motor.

[0070] Please refer to Figure 6 and Figure 8 As shown, this application also relates to an electric motor, which includes a rotor assembly 4 and the aforementioned stator assembly 3. The stator assembly 3 surrounds the outer periphery of the rotor assembly 4. The rotor assembly 4, as the dynamic part of the motor, includes rotatable components, and its function is to generate power through electromagnetic interaction with the stator assembly 3, thereby driving the rotation of the motor.

[0071] In one exemplary embodiment, please refer to Figure 8 As shown, the rotor assembly 4 includes a shaft 41 and a bearing 42 sleeved on the shaft 41. A glue reservoir 421 is recessed on the outer circumferential surface of the bearing 42. The glue reservoir 421 is distributed in the form of annular or intermittent recesses, which can accommodate adhesive glue and form a firm bonding interface with external mounting components during assembly.

[0072] The function of the adhesive reservoir 421 is to increase the bonding area and form a more stable connection by providing space to hold the adhesive material. Due to the presence of the adhesive reservoir 421, the adhesive can be evenly distributed between the bearing 42 and the mounting components during installation, ensuring that the bearing 42 is more securely fixed to the shaft 41 during installation. This avoids the risk of the bearing 42 loosening or shifting due to weak adhesion, thus allowing the shaft 41 to be supported by a single bearing 41. The stator assembly 3 is designed as a ring structure, surrounding the outer periphery of the rotor assembly 4, forming a concentric nested layout. The inner diameter of the stator assembly 3 matches the outer diameter of the rotor assembly 4, ensuring an appropriate air gap between them so that the magnetic fields interact to generate driving force. The windings 33 in the winding slots 34 of the stator assembly 3 generate a magnetic field through current excitation, which interacts with the magnets 43 sleeved on the shaft 41 of the rotor assembly 4, driving the rotor to rotate, thereby realizing the motor's rotation function. The magnets 43 are preferably multi-pole sintered neodymium iron boron radiation rings.

[0073] Please refer to Figures 9 to 12 As shown, the motor also includes a housing 5 and an impeller 6. The housing 5 has a bearing chamber 51 that extends axially; the bearing 42 of the rotor assembly 4 of the motor is installed in the bearing chamber 51; the impeller 6 is located on the front side of the housing 5, and the impeller 6 is axially sleeved on the front end of the shaft 41 of the rotor assembly 4 of the motor.

[0074] The bearing chamber 51 is located in the central area of ​​the housing 5. Its inner wall is designed to be cylindrical, matching the outer circumferential surface of the bearing 42 in the motor rotor assembly 4, ensuring that the bearing 42 can be securely embedded therein. The axially through design of the bearing chamber 51 not only facilitates the installation of the bearing 42, but also provides a channel for the extension of the shaft 41. The shaft 41 extends out from the bearing 42, with its front end tightly fitted into the central hole of the impeller 6, and a balance ring 44 fitted onto the rear end of the shaft 41.

[0075] Specifically, participants Figure 11 As shown, the bearing 42 includes an outer ring 422 and balls 423 arranged inside the outer ring 422. The balls 423 directly contact the rotating shaft 41. The outer ring 422 is an annular component, fixed within the bearing chamber 51 of the housing 5, providing an external support frame for the bearing 42. Multiple balls 423 are arranged inside the outer ring 422, uniformly distributed to form a rolling layer. This design eliminates the need for an inner ring structure; the bearing 42 no longer supports the rotating shaft 41 through an inner ring, but instead directly contacts the outer surface of the rotating shaft 41 through the balls 423. This direct contact design reduces intermediate transmission layers, allowing the rotating shaft 41 to utilize the rolling characteristics of the balls 423 more efficiently during rotation, thereby increasing the motor speed.

[0076] The motor, serving as the power core, consists of a rotor assembly 4 and a stator assembly 3. The bearing 42 of the rotor assembly 4 is installed inside the bearing chamber 51 of the housing 5, forming a tight adhesive connection with the bearing chamber 51. The stator assembly 3 surrounds the magnets 43 of the rotor assembly 4, and drives the rotor to rotate through the magnetic field generated by its windings 33.

[0077] The impeller 6 is located on the front side of the housing 5 and serves as the direct actuator for airflow generation. Its center is sleeved on the front end of the rotor assembly 4 shaft 41 along the axial direction and rotates coaxially with the shaft 41. When the shaft 41 rotates, the impeller 6 rotates at high speed, driving airflow to achieve the function of intake or exhaust.

[0078] In one exemplary embodiment, please refer to Figure 11 and Figure 12 As shown, the shell 5 includes an inner cylinder 52 and an outer cylinder 53 surrounding the rear end of the inner cylinder 52. A first guide vane 54 is provided between the inner cylinder 52 and the outer cylinder 53.

[0079] The inner cylinder 52, as the core part of the shell 5, serves to support and protect the motor rotor assembly 4. It is typically made of robust materials with high corrosion resistance and mechanical strength to withstand the high temperatures and long-term operating conditions of the motor. The outer wall of the inner cylinder 52 and the inner wall of the outer cylinder 53 form a fixed structure through a specific mating mechanism.

[0080] The inner cylinder 52 is cylindrical and extends axially. It contains a bearing chamber 51 for mounting the bearing 42 of the motor rotor assembly 4. The outer cylinder 53 surrounds the rear end of the inner cylinder 52, exhibiting a larger diameter and forming a ring-shaped enclosure that encloses the rear end portion of the inner cylinder 52. Multiple first guide vanes 54 are evenly distributed circumferentially, connecting the outer wall of the inner cylinder 52 and the inner wall of the outer cylinder 53. They guide airflow and improve its stability and directionality.

[0081] Further, please refer to Figure 11 As shown, the motor also includes a wind shield 7 covering the outside of the impeller 6 and the inner cylinder 52, and a second guide vane 55 is provided between the wind shield 7 and the front end of the inner cylinder 52.

[0082] The main function of the shroud 7 is to protect the structure between the impeller 6 and the inner cylinder 52, while also providing necessary guidance for the airflow, forming a barrier to guide the airflow and preventing energy loss caused by irregular airflow. Through a reasonable design of the shroud 7, the airflow can flow more smoothly over the impeller 6 and the inner cylinder 52, thereby improving the motor's operating efficiency.

[0083] A second guide vane 55 is provided between the front end of the shroud 7 and the inner cylinder 52 to form a two-stage flow guiding system within the shroud 7. The main function of the second guide vane 55 is to further optimize the airflow path and reduce turbulence during the flow process. When the airflow passes through the impeller 6, turbulence is usually generated due to irregular flow and rapid changes, resulting in energy waste and noise. The second guide vane 55 can effectively guide the airflow, reduce the degree of turbulence in the airflow, and thus reduce turbulence noise.

[0084] In one exemplary embodiment, please refer to Figure 11 and Figure 12 As shown, the housing 5 is provided with a plurality of positioning parts 56 surrounding the stator assembly 3 of the motor. The positioning parts 56 are interference-fitted with the stator assembly 3, and the inner surfaces of the plurality of positioning parts 56 form a cylindrical surface coaxial with the stator assembly 3.

[0085] Multiple positioning parts 56 are independently and evenly distributed at the rear end of the inner cylinder 52 of the housing 5 and surround the outer periphery of the stator assembly 3. These positioning parts 56 are protruding or support columnar structures, and their inner surfaces together form a cylindrical surface coaxial with the stator assembly 3. The diameter of this cylindrical surface is slightly smaller than the outer diameter of the stator assembly 3, thereby achieving an interference fit with the stator assembly 3.

[0086] The inner surface of the positioning part 56 forms a cylindrical surface coaxial with the stator assembly 3. This structural design ensures that the stator assembly 3 can be accurately positioned in the axial and radial directions. Through interference fit, the positioning part 56 and the stator assembly 3 form a tight connection, making it difficult for the stator assembly 3 to shift or vibrate during motor operation, thus maintaining the high stability and low noise operation of the motor.

[0087] The positioning part 56 not only serves a mechanical fixing function, but also acts as a guide to a certain extent. During the installation of the stator assembly 3, the positioning part 56 can effectively guide the stator assembly 3 into the correct position, ensuring the relative positional accuracy between the components and avoiding deviations that may occur during the assembly process.

[0088] The design of multiple positioning parts 56 can also shape the stator assembly 3, especially during production and installation. The stator assembly 3 is usually subjected to certain external forces, which may cause slight deformation or bending. Through the constraint of these positioning parts 56, the deformation of the stator assembly 3 during long-term use can be effectively reduced, thereby improving the long-term reliability and stability of the motor.

[0089] Further, please refer to Figure 12 As shown, a threaded connection portion 57 is provided between two adjacent positioning portions 56 for screwing into the stator assembly 3 of the motor. The threaded connection portion 57 is provided in the form of a threaded hole or a threaded boss, matching the corresponding thread structure on the stator assembly 3. The cooperation between the threaded connection portion 57 and the positioning portion 56 serves to limit the movement of the stator assembly 3.

[0090] Specifically, the positioning part 56 provides initial precise positioning of the stator assembly 3, ensuring it maintains the correct axial and radial position during installation. The threaded connection part 57, through the tightening force of the threads, firmly secures the stator assembly 3 to the housing 5, improving not only the stability of the assembly but also enhancing the compactness and reliability of the structure. The threaded connection part 57 effectively prevents the stator assembly 3 from loosening during operation due to vibration or other external factors, ensuring the efficient and stable operation of the motor.

[0091] In one exemplary embodiment, please refer to Figure 10 and Figure 11 As shown, the motor also includes a base 81 and a drive circuit board 82 fixed on the base 81. The drive circuit board 82 is electrically connected to the piercing terminal 35 of the stator assembly 3. A heat sink 83 is provided on the side of the drive circuit board 82 near the stator assembly 3. The heat sink 83 has heat dissipation holes 84, and thermally conductive material is filled between the heat sink 83 and the chip on the drive circuit board 82. The airflow generated when the motor is operating can blow towards the heat sink 83.

[0092] A heat sink 83 is provided on the side of the drive circuit board 82 near the stator assembly 3. This sheet-like metal structure covers the surface of the circuit board and has multiple heat dissipation holes 84 distributed on it to increase the airflow area. A thermally conductive material, such as thermally conductive silicone or a gasket, is filled between the heat sink 83 and the chip on the drive circuit board 82. This thermally conductive material fills the gap between the heat sink 83 and the chip, ensuring that the heat generated by the chip can be efficiently transferred to the heat sink 83. When the motor is running, the airflow generated by the impeller 6 can be directed towards the heat sink 83, carrying away heat through the heat dissipation holes 84, achieving an active cooling effect.

[0093] During motor operation, the chips on the circuit board generate significant heat. The heat sink 83, acting as a heat exchange component, enhances heat dissipation by increasing its surface area. The surface of the heat sink 83 is equipped with heat dissipation holes 84, further enhancing airflow and thus improving heat dissipation efficiency. Airflow passes through these holes 84 during motor operation, carrying away the heat generated by the circuit board and chips, maintaining the system's operating temperature within a suitable range, and preventing damage to the circuit board and chips due to overheating.

[0094] In addition, this application also relates to a cleaning device, which may be a sweeper, a vacuum cleaner, etc. The cleaning device includes a main body and the aforementioned motor, which is located on the main body and provides suction power for the cleaning device.

[0095] In summary, the stator core bar, stator assembly, motor, and cleaning equipment provided in this application, through the design of the difference in curvature and thickness distribution of the inner and outer surfaces of the stator yoke connection, avoid the problem of uneven roundness of the stator core bar after rolling due to stress non-concentration; control the stress concentration in the middle area of ​​the connection, so that the deformation is consistent during the rolling process and improve the roundness uniformity.

[0096] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0097] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stator core bar, characterized in that, include: The stator yoke includes multiple yoke portions connected in sequence, with a connecting portion connecting adjacent yoke portions; The stator tooth includes a plurality of teeth extending toward the inside of the stator yoke, the teeth being disposed on the inner wall of the yoke. The inner and outer surfaces of the connecting part are both curved toward the outside of the stator yoke, the curvature of the inner surface of the connecting part is greater than that of the outer surface, and the thickness of the middle region of the connecting part is less than that of the two side regions.

2. The stator core bar according to claim 1, characterized in that, The thickness of the connecting part gradually increases from the middle region to the two sides.

3. The stator core bar according to claim 1, characterized in that, On a plane perpendicular to the axis of the stator yoke, The outer and inner edges of the projection of the connecting part are non-concentric elliptical arcs, and the points of maximum curvature on both the outer and inner edges are located in the middle region of the projection; or The outer edge of the projection of the connecting part is arc-shaped, and the inner edge is elliptical arc-shaped. The point of maximum curvature on the inner edge is located in the middle region of the projection; or The outer edge of the projection of the connecting part is elliptical, and the inner edge is circular. The point of maximum curvature on the outer edge is located in the middle region of the projection; or The outer and inner edges of the projection of the connecting part are non-concentric arcs, and the line connecting the centers of the outer and inner edges passes through the middle region of the projection.

4. The stator core bar according to claim 1, characterized in that, A groove for welding solder is formed between the outer surface of the connecting part and its two adjacent yokes.

5. The stator core bar according to claim 1, characterized in that, The thickness of the connecting part is between 0.2 and 0.45 mm; and / or When the stator core bar is unfolded into a straight line, the distance between two adjacent teeth is reduced by 0 to 0.1 mm.

6. A stator assembly, characterized in that, include: The stator core is formed by winding a stator core bar according to any one of claims 1 to 5, wherein a winding groove is formed between two adjacent teeth on the stator core; An insulating frame is disposed on the surface of the stator core; The winding is located within the winding slot and is wound around the outer periphery of the insulating skeleton covering the teeth.

7. An electric motor, characterized in that, include: Rotor assembly; The stator assembly as claimed in claim 6, wherein the stator assembly surrounds the outer periphery of the rotor assembly.

8. The motor according to claim 7, characterized in that, The rotor assembly includes a rotating shaft and a bearing sleeved on the rotating shaft, and a glue storage groove is recessed on the outer peripheral surface of the bearing.

9. The motor according to claim 7, characterized in that, The motor also includes: The housing has a bearing chamber that extends axially, the bearing of the rotor assembly is installed in the bearing chamber, the housing includes an inner cylinder and an outer cylinder surrounding the rear end of the inner cylinder, and a first guide vane is provided between the inner cylinder and the outer cylinder; An impeller is located on the front side of the housing, and the impeller is axially sleeved around the front end of the rotor assembly of the motor. A wind shield is provided on the outside of the impeller and the inner cylinder, and a second guide vane is provided between the wind shield and the front end of the inner cylinder.

10. The motor according to claim 9, characterized in that, The housing is provided with a plurality of positioning portions surrounding the stator assembly of the motor. The positioning portions are interference-fitted with the stator assembly. The inner surfaces of the plurality of positioning portions form a cylindrical surface coaxial with the stator assembly. A threaded connection portion for screwing into the stator assembly of the motor is provided between two adjacent positioning portions.

11. The motor according to claim 7, characterized in that, The motor also includes a drive circuit board electrically connected to the stator assembly. The drive circuit board has a heat sink on the side near the stator assembly, and a thermally conductive material is provided between the heat sink and the chip on the drive circuit board.

12. A cleaning device, characterized in that, include: Equipment body; The motor as described in any one of claims 7 to 11 is disposed on the main body of the device.

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