Motor and cleaning device

Abstract

The utility model provides a kind of motor and cleaning equipment, the motor includes Hall magnet ring, Hall magnet ring positioning structure, center axis and base, the Hall magnet ring is sleeved on the center axis, the Hall magnet ring positioning structure is used to limit this Hall magnet ring on the base;The Hall magnet ring positioning structure includes: at least three limit protrusions, and distribution is on the same circumference with the center axis as center, to form the enclosing structure for clamping the Hall magnet ring, so that at least three the limit protrusions are all with the outer circumferential surface of the Hall magnet ring abut;The limit protrusion is arranged on the base for fixing the Hall magnet ring and the center axis.The utility model solves the concentricity of Hall magnet ring and center axis of motor in relevant technology, Hall magnet ring and outer circumferential structure assembly requirement strict and other problems.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor and a cleaning device. Background Technology

[0002] Hall effect magnetic rings concentrate and regulate magnetic fields, enabling Hall elements to stably and accurately sense changes in magnetic fields, reducing interference from stray magnetic fields, ensuring the reliability of output signals, and meeting the high-precision and high-stability detection requirements of industrial control and automation equipment. The concentricity of the Hall effect magnetic ring with its central axis is a crucial prerequisite for ensuring stable output signals and accurate detection; in practical applications, concentricity errors must be strictly controlled (typically within the micrometer range).

[0003] Currently, most Hall effect magnetic rings on the market are concentric with the central shaft by using positioning fixtures to ensure accurate installation, followed by adhesive fixation. Therefore, if the fixtures are removed before the adhesive is fully bonded, there is a risk of misalignment of the Hall effect magnetic ring. This places a high demand on process control capabilities. Furthermore, errors in the disassembly of the positioning fixtures can lead to poor concentricity between the Hall effect magnetic ring and the central shaft.

[0004] To address this, related technologies, such as the Chinese patent document CN219718039U, disclose a device for calibrating the angle of an external Hall effect sensor. Its positioning structure for the Hall effect magnetic ring includes: a circular groove for the Hall effect disk installed on the motor end face surface with the motor shaft as the center; the magnetic ring fitting around the motor shaft; and three Hall effect disk positioning screw holes evenly distributed concentrically between the circular groove and the magnetic ring. While this technology solves to some extent the problem of concentricity discrepancies between the Hall effect magnetic ring and the central shaft caused by tooling disassembly during configuration, it still has the following drawbacks: Because the Hall effect disk positioning screw holes are set on the motor's magnetic ring, openings can disrupt the integrity of the magnetic ring, potentially leading to uneven magnetic field distribution, localized weakening or leakage of the magnetic field; the Hall effect sensor works by sensing changes in the magnetic field of the magnetic ring, and if openings cause magnetic field anomalies, the signals received by the Hall effect sensor may be inaccurate, affecting detection accuracy (such as the measurement of parameters like speed and position); if the opening in the magnetic ring is small and far from the magnetic field-sensitive area, the impact on the overall effect may be small, but rigorous testing and verification are required. Utility Model Content

[0005] One of the technical problems that this utility model aims to solve is the concentricity difference between the Hall magnetic ring and the central shaft of the motor, and the strict requirements for the assembly of the Hall magnetic ring and the outer peripheral structure in related technologies.

[0006] To solve the above-mentioned technical problems, this utility model provides a motor, including a Hall magnetic ring, a Hall magnetic ring positioning structure, a central shaft, and a base. The Hall magnetic ring is sleeved on the central shaft, and the Hall magnetic ring positioning structure is used to limit the Hall magnetic ring on the base. The Hall magnetic ring positioning structure includes at least three limiting protrusions distributed on the same circumference with the central shaft as the center to form an enclosing structure for securing the Hall magnetic ring, such that at least three of the limiting protrusions abut against the outer peripheral surface of the Hall magnetic ring. The limiting protrusions are provided on the base for fixing the Hall magnetic ring and the central shaft.

[0007] The motor provided by this utility model features a Hall effect magnetic ring positioning structure. Utilizing at least three limiting protrusions distributed on the same circumference centered on the central shaft, this structure forms an enclosing structure for securing the Hall effect magnetic ring. This ensures the fixed Hall effect magnetic ring is coaxially aligned with the motor's central shaft. The limiting protrusions of the positioning structure abut against the outer circumference of the Hall effect magnetic ring, facilitating assembly. Furthermore, the limiting protrusions are located on a base for fixing the Hall effect magnetic ring and the central shaft, further ensuring the coaxial alignment of the two components. This guarantees good concentricity between the Hall effect magnetic ring and the central shaft after assembly, thus solving problems such as poor concentricity between the Hall effect magnetic ring and the central shaft, and strict assembly requirements between the Hall effect magnetic ring and the outer circumference structure in related technologies. Moreover, the good concentricity between the Hall effect magnetic ring and the central shaft effectively ensures good concentricity between the Hall effect components, thereby improving the motor's responsiveness.

[0008] Preferably, the limiting protrusions are axially symmetrical, with the lines containing the major axes of the three limiting protrusions intersecting the axis of the central axis, and the angle between each pair of projections of the three major axes onto the base being 120°. This structure employs the principle of three-point fixed support stability, utilizing at least three limiting protrusions to form a fixed Hall effect magnetic ring. Furthermore, by setting the lines containing the major axes of the three limiting protrusions to intersect the axis of the central axis, and ensuring that the angle between each pair of projections of the three major axes onto the base is 120°, the symmetry and balanced force distribution of the fixed position of the Hall effect magnetic ring on the base are guaranteed, which is more conducive to improving the accuracy and sensitivity during motor operation and collaborative operation.

[0009] Preferably, the limiting protrusion includes an arc-shaped surface that abuts against the outer peripheral surface of the Hall magnetic ring, and the arc-shaped surfaces of the multiple limiting protrusions are all tangent to the outer peripheral surface of the Hall magnetic ring. This arc-shaped surface structure effectively prevents scratches or other damage to the outer peripheral surface of the Hall magnetic ring caused by the sharp edges of contacting components during installation. The fact that the arc-shaped surfaces of the multiple limiting protrusions are tangent to the outer peripheral surface of the Hall magnetic ring ensures that the Hall magnetic ring is not easily damaged during installation. The tangential abutment structure ensures that the smallest inscribed circle formed by the multiple arc-shaped surfaces is consistent with the maximum outer diameter of the Hall magnetic ring. Simultaneously, the multiple limiting protrusions effectively limit the Hall magnetic ring on the base, preventing it from wobbling or misaligning along the mounting surface of the base, which could ultimately lead to a misalignment between the Hall magnetic ring and the central axis.

[0010] Preferably, the limiting protrusion is a columnar protrusion; and / or, the height of the columnar protrusion is not greater than the thickness of the Hall magnetic ring above the mounting surface of the base. The columnar design of the limiting protrusion satisfies the requirement that its circumferential surface for abutting the Hall magnetic ring be arc-shaped, while also standardizing the shape of the limiting protrusion, which is beneficial for subsequent standardized production. The fact that the height of the columnar limiting protrusion is not greater than the thickness of the Hall magnetic ring above the mounting surface of the base effectively prevents the limiting protrusion from interfering with the installation or use of other components in terms of structural space during installation or use.

[0011] Preferably, the Hall effect magnetic ring positioning structure further includes a limiting groove disposed on the base for enclosing the Hall effect magnetic ring together with the limiting protrusion to limit its position. The sum of the depth of the limiting groove and the height of the limiting protrusion is not greater than the thickness of the Hall effect magnetic ring. The limiting groove provides further limiting while the limiting protrusion limits the Hall effect magnetic ring's radially extending outer periphery. The limiting groove not only limits its radially extending outer periphery but also further limits the connection between the Hall effect magnetic ring and the base along its thickness direction, thus achieving limiting of the Hall effect magnetic ring in both radial and axial dimensions. This ensures that the concentricity of the Hall effect magnetic ring with the central axis after alignment and installation is not altered by external factors during installation or use. The fact that the sum of the depth of the limiting groove and the height of the limiting protrusion is not greater than the thickness of the Hall effect magnetic ring effectively prevents the limiting protrusion from interfering with the installation or use of other components in terms of structural space during installation or use.

[0012] Preferably, the depth of the limiting groove is no greater than half the thickness of the Hall magnetic ring. This design takes into account that the limiting groove is built into the mounting surface of the base. If the depth of the limiting groove is too large, it will not further enhance its effect on fixing the position of the Hall magnetic ring, and may affect the position installation of other components on the mounting surface of the base.

[0013] Preferably, an adhesive layer is provided between the Hall magnetic ring and the limiting groove, and the thickness of the adhesive layer is no greater than 0.05 mm. The Hall magnetic ring is fixed in the limiting groove by the adhesive layer with a thickness of no more than 0.05 mm, so as to fix the Hall magnetic ring to the base through the limiting groove, ensuring the installation position relationship between the Hall magnetic ring and the base, as well as the concentricity between the Hall magnetic ring and the central axis installed on the base. Furthermore, the 0.05 mm adhesive layer can ensure the installation effect between the Hall magnetic ring and the base, while avoiding waste of adhesive material, thus making production more standardized.

[0014] Preferably, the bottom of the limiting groove is provided with a frosted layer to facilitate the application of adhesive. The frosted layer effectively ensures the connection between the adhesive (attachment layer) and the limiting groove structure, thereby ensuring the tightness and stability of the connection between the Hall magnetic ring and the limiting groove structure through the adhesive (attachment layer).

[0015] Preferably, the base includes a circular mounting surface, the center of which overlaps with the axis of the central shaft. This ensures the symmetry of the motor drive structure, resulting in more precise motor speed control.

[0016] Preferably, the Hall magnetic ring positioning structure is integrally formed with the base to avoid installation errors when the Hall magnetic ring positioning structure is installed as a separate component, which would affect the concentricity between the Hall magnetic ring and the central shaft, and thus affect the concentricity between the Hall magnetic ring and the Hall element, and affect the sensitivity of the motor. This better ensures the concentricity accuracy of the structural installation between the Hall magnetic ring, the Hall element and the central shaft.

[0017] This utility model also provides a cleaning device, which includes a main unit and a motor for driving the main unit, wherein the motor is any of the motors described above.

[0018] The cleaning equipment motor provided by this utility model utilizes a Hall effect magnetic ring positioning structure. At least three limiting protrusions distributed on the same circumference centered on the central axis form an enclosing structure for securing the Hall effect magnetic ring. This ensures the fixed Hall effect magnetic ring is coaxially aligned with the motor's central axis, and the limiting protrusions of the positioning structure abut against the outer circumference of the Hall effect magnetic ring, facilitating assembly. Furthermore, the limiting protrusions are located on a base for fixing the Hall effect magnetic ring and the central axis, further ensuring the coaxial alignment of the Hall effect magnetic ring and the central axis. This guarantees good concentricity between the assembled Hall effect magnetic ring and the central axis, thus solving problems such as poor concentricity between the Hall effect magnetic ring and the central axis, and strict assembly requirements between the Hall effect magnetic ring and the outer circumference structure in related technologies. Moreover, the good concentricity between the Hall effect magnetic ring and the central axis effectively ensures good concentricity between the Hall effect components, thereby improving the motor's responsiveness. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the Hall magnetic ring positioning structure of the motor on the base disclosed in this embodiment of the utility model;

[0021] Figure 2 yes Figure 1 A three-dimensional image;

[0022] Figure 3 yes Figure 1 A schematic diagram of the transverse cross-sectional structure;

[0023] Figure 4 yes Figure 1 A schematic diagram of a partial structure in an electric motor.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Hall effect magnetic ring; 2. Hall effect magnetic ring positioning structure; 201. Limiting protrusion; 2011. Arc-shaped surface; 202. Limiting groove; 3. Central shaft; 4. Base; 401. Mounting surface; 5. Positioning mounting hole; 6. Hall effect components. Detailed Implementation

[0026] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this utility model by way of example, but should not be used to limit the scope of this utility model. This utility model can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0027] These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0028] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "inner," "outer," etc., indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] Furthermore, the use of words such as "including" in this utility model means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that it also covers other elements.

[0030] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0031] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0032] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0033] like Figures 1 to 4 As shown, this utility model provides a motor, which includes a Hall magnetic ring 1, a Hall magnetic ring positioning structure 2, a central shaft 3, and a base 4. The Hall magnetic ring 1 is sleeved on the central shaft 3. The Hall magnetic ring positioning structure 2 is used to limit the Hall magnetic ring 1 on the base 4. The Hall magnetic ring positioning structure 2 includes at least three limiting protrusions 201, and the at least three limiting protrusions 201 are distributed on the same circumference with the central shaft 3 as the center to form an enclosing structure for securing the Hall magnetic ring 1, such that at least three limiting protrusions 201 abut against the outer peripheral surface of the Hall magnetic ring. The limiting protrusions 201 are provided on the base for fixing the Hall magnetic ring and the central shaft.

[0034] The motor provided by this utility model features a Hall magnetic ring positioning structure 2. At least three limiting protrusions 201 distributed on the same circumference centered on the central shaft 3 of the Hall magnetic ring positioning structure 2 form an enclosing structure for securing the Hall magnetic ring 1. This ensures that the fixed Hall magnetic ring 1 is coaxially positioned with the central shaft 3 of the motor. The limiting protrusions 201 of the Hall magnetic ring positioning structure 2 all abut against the outer periphery of the Hall magnetic ring 1, facilitating the assembly of the Hall magnetic ring 1. Furthermore, the limiting protrusions 201 are located on the base 4 used to fix the Hall magnetic ring 1 and the central shaft 3, further ensuring the coaxial positional relationship between the Hall magnetic ring 1 and the central shaft 3. This guarantees good concentricity in the positional structure after the Hall magnetic ring 1 and the central shaft 3 are assembled, thus solving problems such as poor concentricity between the Hall magnetic ring and the central shaft, and strict assembly requirements between the Hall magnetic ring and the outer periphery structure in related technologies. Furthermore, the Hall magnetic ring 1 and the central shaft 3 are well concentric, which effectively ensures good concentricity between the Hall element 6, which is concentrically positioned with the Hall magnetic ring 1 and the central shaft 3. Figure 4 As shown, this can further improve the motor's responsiveness.

[0035] In an optional embodiment of this utility model, the limiting protrusion 201 has an axially symmetrical structure, such as... Figure 1As shown, the projections of the three limiting protrusions 201 onto the plane (mounting surface 401) of the base 4 are elliptical. The lines containing the major axes of the projections of the three limiting protrusions 201 all intersect the axis of the central axis 3, and the angles between any two of the major axes of the projections of the three limiting protrusions 201 are 120°. This structure employs the principle of three-point fixed support stability, utilizing at least three limiting protrusions 201 to form a fixed Hall magnetic ring enclosure. Furthermore, by setting the lines containing the major axes of the projections of the three limiting protrusions 201 to intersect the axis of the central axis, and by ensuring that the Hall magnetic ring 1 is fixed in position on the base 4, the symmetry of the structure and the balance of forces are guaranteed. This is more conducive to improving the accuracy and sensitivity during motor operation and collaborative operation.

[0036] In other optional embodiments of this utility model, the limiting protrusions 201 can be four, five, or six. Three or more limiting protrusions 201 are evenly distributed along the same circle centered on the central axis 3 to jointly form an enclosing structure surrounding the Hall magnetic ring 1. Furthermore, the long axes of the projection patterns of the three or more limiting protrusions 201 on the base 4 (mounting surface 401) intersect at the axis of the central axis 3. These long axes divide the same circle containing the three or more limiting protrusions 201 into equal parts at the same angle, thereby ensuring that the contact area and force exerted by each limiting protrusion 201 on the Hall magnetic ring 1 are the same. This ensures that the Hall magnetic ring 1 and the central axis 3 maintain good concentricity under the enclosing structure formed by the limiting protrusions 201, thus improving the accuracy and sensitivity of the motor and its collaborative operation.

[0037] In an optional embodiment of this utility model, the limiting protrusion 201 includes an arc-shaped surface 2011 that abuts against the outer peripheral surface of the Hall magnetic ring 1, and the arc-shaped surfaces 2011 of the multiple limiting protrusions are all tangent to the outer periphery of the Hall magnetic ring 1. The structure of the arc-shaped surfaces 2011 of the limiting protrusions 201 can effectively prevent scratches or other damage to the outer periphery of the Hall magnetic ring 1 caused by the sharp edges of the contacting parts during the limiting installation of the Hall magnetic ring 1. The arc-shaped surfaces 2011 of the multiple limiting protrusions 201 are tangent to the outer periphery of the Hall magnetic ring 1, which can ensure that the Hall magnetic ring is not easily damaged during the installation process. The tangent abutting structure can ensure that the minimum inscribed circle formed by the multiple arc-shaped surfaces 2011 is consistent with the maximum outer diameter of the Hall magnetic ring 1. At the same time, the Hall magnetic ring 1 is effectively limited on the base 4 by the multiple limiting protrusions 201, preventing it from shaking or misaligning along the mounting surface 401 of the base 4, which would ultimately lead to a difference in concentricity between the Hall magnetic ring 1 and the central axis 3.

[0038] In an optional embodiment of this invention, the limiting protrusion 201 is a columnar protrusion. This ensures that while the limiting protrusion 201 has an arc-shaped surface 2011 that is tangent to the Hall magnetic ring 1 and forms an enclosing structure, it also ensures the axial symmetry of the limiting protrusion 201's own structure. This standardizes the shape of the limiting protrusion and facilitates standardized production. It also ensures the balanced load-bearing capacity during use, thereby improving the accuracy of the motor's speed control. Specifically, in the aforementioned embodiment, the limiting protrusion 201 is a columnar protrusion with an elliptical cross-section, or it can be cylindrical. In a further optional embodiment of this invention, the height of the columnar protrusion is no greater than the thickness of the Hall magnetic ring 1 above the mounting surface 401 of the base 4. This design effectively prevents the limiting protrusion 201 from intersecting with the installation or use of other components in terms of structural space during installation or use.

[0039] In an optional embodiment of this utility model, the Hall magnetic ring positioning structure 2 further includes a limiting groove 202 disposed on the base 4 for enclosing the Hall magnetic ring 1 together with the limiting protrusion 201 to limit its position. The sum of the depth of the limiting groove 202 and the height of the limiting protrusion 201 is not greater than the thickness of the Hall magnetic ring 1. The limiting groove 202 is provided to further limit the Hall magnetic ring 1 while the limiting protrusion 201 limits its outer periphery extending in the radial direction. At the same time, it can also further limit the connection between the Hall magnetic ring 1 and the base 4 in the thickness direction, thereby achieving limiting of the Hall magnetic ring 1 in both radial and axial dimensions, so as to ensure that the concentricity of the Hall magnetic ring 1 with the central axis 3 after alignment and installation will not be changed by external factors during installation or use. The sum of the depth of the limiting groove 202 and the height of the limiting protrusion 201 is not greater than the thickness of the Hall magnetic ring 1, which can effectively prevent the limiting protrusion 201 from having cross-influence on the structural space with the installation or use of other components during installation or use.

[0040] In an optional embodiment of this utility model, the depth of the limiting groove 202 is no greater than half the thickness of the Hall magnetic ring 1. Generally, the depth of the limiting groove 202 is 1mm, and the specific size can be adjusted according to actual usage requirements. The above setting takes into account that the limiting groove 202 is built into the mounting surface 401 of the base 4. An excessively deep limiting groove 202 will not further enhance its effect on fixing the position of the Hall magnetic ring 1, and may affect the positional installation of other components on the mounting surface 401 of the base 4.

[0041] In an optional embodiment of this utility model, an adhesive layer is provided between the Hall magnetic ring 1 and the limiting groove 202, and the thickness of the adhesive layer is no greater than 0.05 mm. The Hall magnetic ring 1 is fixed in the limiting groove by the adhesive layer with a thickness of no more than 0.05 mm, so as to fix the Hall magnetic ring 1 to the base 4 through the limiting groove 202, ensuring the installation position relationship between the Hall magnetic ring 1 and the base 4, and the concentricity between the Hall magnetic ring 1 and the central axis 3 installed on the base 4. The 0.05 mm adhesive layer can ensure the installation effect between the Hall magnetic ring and the base, while avoiding waste of adhesive material, making production more standardized. The adhesive layer can be an immediate coating of adhesive or a pre-formed adhesive layer.

[0042] In a further optional embodiment of this utility model, the bottom of the limiting groove 202 is provided with a frosted layer for easy application of adhesive. The frosted layer effectively ensures the connection between the adhesive (adhesive layer) and the limiting groove 202 structure, thereby ensuring the tightness and stability of the connection between the Hall magnetic ring 1 and the limiting groove 202 structure through the adhesive (adhesive layer).

[0043] In an optional embodiment of this utility model, the base 4 includes a circular mounting surface 401, the center of which overlaps with the axis of the central shaft 3, thereby ensuring the symmetry of the motor transmission structure and making the motor speed control more precise.

[0044] In an optional embodiment of this utility model, the Hall magnetic ring positioning structure 2 and the base 4 are integrally formed to avoid installation errors when the Hall magnetic ring positioning structure 2 is installed as a separate component, which would affect the concentricity between the Hall magnetic ring 1 and the central shaft 3, and thus affect the concentricity between the Hall magnetic ring 1 and the Hall element 6, and affect the sensitivity of the motor. This better ensures the concentricity accuracy of the structural installation between the Hall magnetic ring 1, the Hall element 6 and the central shaft 3.

[0045] In an optional embodiment of this utility model, the mounting surface 401 of the motor base 4 is provided with positioning mounting holes 5 for mounting fasteners that integrate the internal structure of the motor. Multiple positioning mounting holes 5 are at least evenly distributed on the same circle centered on the central shaft 3 to ensure the stability of the mounting of the outer circumference structure of the central shaft 3. In a further optional embodiment, the positioning mounting holes 5 are spaced apart from the aforementioned limiting protrusions 201, thereby ensuring the stability of the limiting protrusions 201 in limiting the Hall magnetic ring 1. This prevents localized shaking due to insufficient tightness in the connection of motor components, which could lead to structural friction between the limiting protrusions 201 and the Hall magnetic ring 1, thus affecting the accuracy of the motor.

[0046] In other embodiments of the present invention, a cleaning device is also provided, which includes a main unit and a motor for driving the main unit, wherein the motor is any of the motors described above.

[0047] The cleaning equipment motor provided by this utility model utilizes a Hall magnetic ring positioning structure 2. At least three limiting protrusions 201 distributed on the same circumference centered on the central axis 3 of the Hall magnetic ring positioning structure 2 form an enclosing structure for securing the Hall magnetic ring 1. This ensures that the fixed Hall magnetic ring 1 is coaxially aligned with the central axis 3 of the motor. Furthermore, the limiting protrusions 201 of the Hall magnetic ring positioning structure 2 all abut against the outer periphery of the Hall magnetic ring 1, facilitating the assembly of the Hall magnetic ring 1. The limiting protrusions 201 are also located on the base 4 used to fix the Hall magnetic ring 1 and the central axis 3, further ensuring the coaxial alignment of the Hall magnetic ring 1 and the central axis 3. This guarantees good concentricity in the positional structure after the Hall magnetic ring 1 and the central axis 3 are assembled, thus solving problems such as poor concentricity between the Hall magnetic ring and the central axis, and strict assembly requirements between the Hall magnetic ring and the outer periphery in related technologies. Furthermore, the Hall magnetic ring 1 and the central shaft 3 are well concentric, which can effectively ensure the good concentricity between the Hall element 6, which is set concentrically with the central shaft 3, thereby improving the motor's response sensitivity.

[0048] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0049] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. An electric machine characterized by The device includes a Hall magnetic ring, a Hall magnetic ring positioning structure, a central shaft, and a base. The Hall magnetic ring is sleeved on the central shaft, and the Hall magnetic ring positioning structure is used to limit the Hall magnetic ring on the base. The Hall magnetic ring positioning structure includes: At least three limiting protrusions are distributed on the same circumference with the central axis as the center to form an enclosing structure for securing the Hall magnetic ring, such that at least three of the limiting protrusions abut against the outer peripheral surface of the Hall magnetic ring. The limiting protrusion is provided on the base used to fix the Hall magnetic ring and the central shaft.

2. The electric machine of claim 1, wherein, The limiting protrusions are axially symmetrical structures. The straight lines containing the major axes of the three limiting protrusions all intersect the axis of the central axis, and the included angle between each pair of the projections of the three major axes onto the base is 120°.

3. The electric machine of claim 1, wherein, The limiting protrusion includes an arc-shaped surface that abuts against the outer peripheral surface of the Hall magnetic ring, and the arc-shaped surfaces of the plurality of limiting protrusions are all tangent to the outer periphery of the Hall magnetic ring.

4. The electric machine of claim 1, wherein, The limiting protrusion is a columnar protrusion; and / or, the height of the columnar protrusion is not greater than the thickness of the Hall magnetic ring above the mounting surface of the base.

5. The electric machine of claim 1, wherein, The Hall magnetic ring positioning structure also includes a limiting groove disposed on the base for surrounding the Hall magnetic ring together with the limiting protrusion to limit its position. The sum of the depth of the limiting groove and the height of the limiting protrusion is not greater than the thickness of the Hall magnetic ring.

6. The electric machine of claim 5, wherein, The depth of the limiting groove is no greater than half the thickness of the Hall magnetic ring.

7. The electric machine of claim 5, wherein, An adhesive layer is provided between the Hall magnetic ring and the limiting groove, the thickness of the adhesive layer being no more than 0.05 mm; and / or, the bottom of the limiting groove is provided with a frosted layer to facilitate the application of adhesive.

8. The electric machine of claim 1, wherein, The base includes a circular mounting surface, the center of which overlaps with the axis of the central shaft.

9. The motor according to any one of claims 1 to 8, characterized in that, The Hall magnetic ring positioning structure is integrally formed with the base.

10. A cleaning apparatus, characterized by It includes a host and a motor for driving the host, said motor being the motor according to any one of claims 1 to 9.

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