Magnetic ring structure and motor

Abstract

The utility model provides a magnet ring structure and motor, wherein the magnet ring structure comprises a shaft sleeve, an annular disc and a permanent magnet, the shaft sleeve is sleeved outside a rotor shaft, the outer side wall of the shaft sleeve far away from the rotor shaft is connected with the inner side wall of the disc through a plurality of connecting ribs, the outer side wall of the disc far away from the shaft sleeve is provided with a magnetic groove, and the permanent magnet is arranged in the magnetic groove. And the permanent magnets are embedded in the magnetic slots. The shaft sleeve and the disc can be stably connected through the connecting ribs, and the connecting ribs can be used as heat dissipation fan blades in the process that the magnetic ring structure rotates along with the rotor shaft, so that heat dissipation and cooling are performed on the magnetic ring structure, the temperature of accessory parts of the magnetic ring structure is reduced, the service life of the magnetic ring structure is prolonged, and the service life of the magnetic ring structure is prolonged. And the operation stability of the magnetic ring structure is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic ring structure design in a motor, in particular to a magnetic ring structure and a motor. Background Art

[0002] In existing PG motors, the rotor and magnetic ring are usually integrated together, that is, the magnetic ring and the rotor shaft are injection-molded into an integral structure. By providing an anti-slip portion on the rotor shaft, the friction force is increased to ensure that there is no relative sliding between the magnetic ring and the rotor shaft.

[0003] For example, patent CN209562261U discloses a rotor shaft assembly, which specifically includes a rotor shaft and a magnetic ring. The magnetic ring and the rotor shaft are injection-molded into an integral structure, and an anti-slip portion is provided on the rotor shaft where the magnetic ring is injected. The anti-slip portion can increase the friction between the magnetic ring and the rotor shaft, making the two fit more tightly, ensuring that there is no relative sliding between the magnetic ring and the rotor shaft, and increasing the position accuracy of the magnetic ring.

[0004] As motors operate for extended periods, their internal components inevitably heat up. This is especially true when the magnetic ring and rotor shaft are integrally injection-molded. The magnetic ring and rotor are tightly packed together, creating a high temperature that can't be effectively dissipated. Prolonged exposure to high temperatures can affect the rotor and magnetic ring's lifespan and sensitivity, ultimately impacting the motor's reliability and safety. Utility Model Content

[0005] In order to overcome the problems existing in the related art, one of the purposes of the present utility model is to provide a magnetic ring structure, which can stably connect the sleeve and the disc through connecting ribs. At the same time, when the magnetic ring structure rotates with the rotor shaft, the connecting ribs can also be used as heat dissipation blades to dissipate heat and cool the magnetic ring structure, reduce the temperature of the accessory parts of the magnetic ring structure, thereby increasing the service life of the magnetic ring structure and ensuring the operational stability of the magnetic ring structure.

[0006] A magnetic ring structure includes a sleeve, an annular disc and a permanent magnet. The sleeve is mounted on the outside of a rotor shaft. The outer wall of the sleeve away from the rotor shaft is connected to the inner wall of the disc via a plurality of connecting ribs. The outer wall of the disc away from the sleeve is provided with a magnetic groove, and the permanent magnet is nested inside the magnetic groove.

[0007] The connecting ribs in this application can achieve a stable connection between the sleeve and the disc. At the same time, when the magnetic ring structure rotates with the rotor shaft, the connecting ribs can also be used as heat dissipation blades to dissipate heat and cool the magnetic ring structure, reduce the temperature of the accessory components of the magnetic ring structure, thereby increasing the service life of the magnetic ring structure and ensuring the operational stability of the magnetic ring structure.

[0008] In a preferred technical solution of the present utility model, the top and bottom ends of the connecting rib are flush with the top and bottom ends of the disc respectively. The angle between the plane between the top and bottom ends of the connecting rib and the plane where the top end of the disc is located is α, where 0° < α < 90°. The top end of the disc is perpendicular to the axis of the sleeve.

[0009] In this application, the connecting member is a flat plate-like structure with a certain thickness, and the angle between the connecting rib of the flat plate-like structure and the top end of the disc needs to be greater than 0° and less than 90°. When the angle between the connecting rib of the flat plate-like structure and the top end of the disc is equal to 0°, that is, the connecting rib of the flat plate-like structure is parallel to the top end or the bottom end of the disc. At this time, during the rotation of the connecting rib, the air between the sleeve and the disc cannot be sufficiently and effectively stirred. Similarly, when the angle between the connecting rib of the flat plate-like structure and the top end of the disc is equal to 90°, that is, the connecting rib of the flat plate-like structure is perpendicular to the top end or the bottom end of the disc. At this time, during the rotation of the connecting rib, the air between the sleeve and the disc also cannot be sufficiently and effectively stirred. Therefore, in this application, the connecting rib of the flat plate-like structure is inclined relative to the top end of the disc, so that a fan structure similar to a wind blade can be formed between the sleeve and the disc. When the connecting rib rotates with the rotor shaft, the connecting rib similar to a wind blade can sufficiently and effectively stir the air between the sleeve and the disc, achieving a better cooling and heat dissipation effect.

[0010] In a preferred technical solution of the present utility model, several of the connecting ribs are evenly distributed along the circumferential direction of the sleeve on the outer side wall of the sleeve.

[0011] The angles between several flat plate-like connecting ribs and the top end of the disc can be equal, for example, all 45°. Or the angles between several flat plate-like connecting ribs and the top end of the disc can be unequal, for example, distributed between 30° - 75°. This will not affect the stirring effect of the connecting rib on the air. At the same time, in this application, one end of the connecting rib is fixed in the outer side wall of the sleeve, and the other end is fixed in the inner side wall of the disc, and the two ends of the connecting rib are flush with the two ends of the disc respectively. That is, in the direction parallel to the axis of the rotor shaft, the connecting rib completely fills the inner side wall of the disc, so as to ensure that the size of the connecting rib in the direction perpendicular to the axis of the rotor shaft is as large as possible, achieving a better heat dissipation effect. At the same time, in this application, it is specified that several connecting ribs are evenly distributed along the circumferential direction of the sleeve, which can ensure that during its rotation, the heat dissipation effect is uniform, achieving uniform and effective heat dissipation and cooling between the sleeve and the disc.

[0012] In a preferred technical solution of the present utility model, in the axial direction of the sleeve, the thickness of the sleeve is greater than the thickness of the disc, and the bottom end of the disc is flush with the bottom end of the sleeve; a first chamfer transition part is provided at the bottom end of the disc, and in the direction from the bottom end of the disc to the magnetic groove, the cross-sectional area of the first chamfer transition part gradually increases.

[0013] The bottom end of the sleeve is provided with a first chamfered transition portion, and the purpose of the first chamfered transition portion is to facilitate the disassembly and installation of the permanent magnet. Since the bottom end of the sleeve is flush with the bottom end of the disc, and the top end of the sleeve is higher than the bottom end of the disc, and the magnetic ring is a groove arranged in the middle position of the outer wall of the disc, the installation and disassembly of the permanent magnet can only be carried out through the bottom end of the disc, which can ensure that the path is the shortest during the installation and disassembly of the permanent magnet. The present application is arranged in the direction from the bottom end of the disc to the magnetic groove, and the cross-sectional area of ​​the first chamfered transition portion gradually increases, that is, the area between the bottom end of the disc and the magnetic groove is set to a truncated cone structure, which not only ensures that the permanent magnet will not fall off after assembly, but also ensures that during the installation and disassembly of the permanent magnet, the truncated cone structure can provide a guiding effect for the permanent magnet, facilitating its installation and disassembly.

[0014] In a preferred technical solution of the present invention, the inner wall of the magnetic groove is provided with a first connecting piece, the outer wall of the permanent magnet is provided with a second connecting piece adapted to the first connecting piece, and the permanent magnet and the magnetic groove are connected by the first connecting piece and the second connecting piece adapted to each other.

[0015] In the present application, the first and second connectors can be mutually adapted protrusions and depressions, or both can be positioning holes, with detachable screws passing through the positioning holes to secure the position of the disk and the permanent magnet. The present application utilizes the fixed structure of the first and second connectors to position and limit the permanent magnet, ensuring a secure connection between the permanent magnet and the disk. As the magnetic ring structure rotates with the motor shaft, the two will not experience positional shifts.

[0016] In a preferred technical solution of the present invention, the first connecting member is a connecting protrusion located at the bottom of the magnetic slot; the second connecting member is a connecting groove located at the inner side wall of the permanent magnet.

[0017] In the present application, the magnetic slot is located in the middle of the outer wall of the disk and is distributed along the circumference of the disk. The bottom of the magnetic slot refers to the annular bottom of the magnetic slot near the sleeve, and the sidewall of the magnetic slot refers to the side perpendicular to the axis of the sleeve. The present application provides a connecting protrusion at the bottom of the magnetic slot. The connecting protrusion can be rectangular, conical, or trapezoidal in structure. Correspondingly, a connecting groove that matches the connecting protrusion is provided on the surface where the permanent magnet abuts the bottom of the magnetic slot, that is, on the inner sidewall of the permanent magnet. The shape of the connecting groove is similar and compatible with the shape of the connecting protrusion to achieve a limited and fixed connection between the magnetic slot and the permanent magnet.

[0018] In a preferred technical solution of the present invention, the inner side wall of the shaft sleeve is provided with reinforcing ribs, and the shaft sleeve is connected to the rotor shaft via the reinforcing ribs.

[0019] The reinforcing ribs are distributed along the axis of the sleeve, and there are multiple reinforcing ribs, which are spaced apart on the inner wall of the sleeve. The shape of the reinforcing ribs can be a raised structure in the shape of an arc, rectangle, or trapezoid. Correspondingly, a recessed structure that matches the reinforcing ribs is provided on the outer wall of the rotor shaft. The reinforcing ribs achieve a fixed connection between the rotor shaft and the sleeve, while also avoiding the problem of the sleeve being prone to cracking due to interference fit between the rotor shaft and the sleeve in the prior art. The present application achieves assembly between the rotor shaft and the sleeve through the reinforcing rib structure, avoiding interference fit and ensuring that the two will not be offset during synchronous rotation, thereby improving the rotational stability of the magnetic ring structure.

[0020] In a preferred technical solution of the present invention, second chamfered transition portions are provided on the inner side walls at both ends of the shaft sleeve, and the two ends of the shaft sleeve are connected to the rotor shaft via the second chamfered transition portions.

[0021] The second chamfered transition portion can be arranged at one end or both ends of the sleeve. In the direction parallel to the axial centerline of the sleeve, the cross-sectional area of ​​the second chamfered transition portion on the side close to the center position of the sleeve is larger than the cross-sectional area on the side away from the center position of the sleeve, that is, the top and bottom ends of the sleeve are set to a shape with a large inner diameter at the end and a small inner diameter on the inside. This helps to achieve the assembly of the rotor shaft and the sleeve. When the sleeve needs to be mounted on the rotor shaft, the guiding effect of the second chamfered transition portion can achieve stable assembly of the two. After assembly, the two are limited and fixed by the reinforcing ribs.

[0022] In a preferred technical solution of the present invention, the top end of the shaft sleeve is connected to the motor end cover via a bearing, and heat dissipation holes are provided in the motor end cover.

[0023] As the rotor shaft rotates, the connecting ribs, due to their number, can stir the air between the disc and the sleeve, driving the air flow, and then driving the hot air circulation and rotation of the rotor and magnetic ring structure accessories, and finally dissipate through the heat dissipation holes in the motor end cover, thereby realizing the cooling and heat dissipation function of the connecting ribs on the magnetic ring structure.

[0024] A second object of the present application is to provide a motor comprising the magnetic ring structure as described above.

[0025] The connecting ribs between the sleeve and the disc achieve a stable connection between the motor shaft and the permanent magnet. At the same time, when the magnetic ring structure rotates with the rotor shaft, the connecting ribs can also be used as heat dissipation blades to dissipate heat and cool the magnetic ring structure, reducing the temperature of the magnetic ring structure and the rotor shaft, thereby increasing the service life of the motor and ensuring the operational stability of the motor.

[0026] The beneficial effects of the utility model are:

[0027] The utility model provides a magnetic ring structure, wherein a sleeve is used to be sleeved on the outside of a rotor shaft, and the sleeve is connected to a disk via a connecting rib on the outside away from the rotor shaft. The disk is provided with a magnetic groove on the outside away from the sleeve, and the permanent magnet is nested inside the magnetic groove. In the present application, the connecting rib can achieve a stable connection between the sleeve and the disk. At the same time, when the magnetic ring structure rotates with the rotor shaft, the connecting rib can also be used as a heat dissipation blade to dissipate heat and cool the magnetic ring structure, reduce the temperature of the accessories of the magnetic ring structure, thereby improving the service life of the magnetic ring structure and ensuring the operational stability of the magnetic ring structure.

[0028] The present utility model also provides a motor including the above-mentioned magnetic ring structure, in which a stable connection between the motor shaft and the permanent magnet is achieved through the connecting ribs between the shaft sleeve and the disc. At the same time, when the magnetic ring structure rotates along with the rotor shaft, the connecting ribs can also be used as heat dissipation blades to dissipate heat and cool the magnetic ring structure, thereby reducing the temperature at the magnetic ring structure and the rotor shaft, thereby increasing the service life of the motor and ensuring the operating stability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is an overall schematic diagram of the magnetic ring structure of this application;

[0030] Figure 2 This is a planar schematic diagram of the magnetic ring structure of this application;

[0031] Figure 3 This is a front view schematic diagram of the magnetic ring structure of this application;

[0032] Figure 4 This is an enlarged schematic diagram of the internal reinforcement ribs of the sleeve;

[0033] Figure 5 It is a structural schematic diagram of the magnetic slot in the magnetic ring structure;

[0034] Figure 6 Schematic diagram of the structure of the permanent magnet in the magnetic ring structure;

[0035] Figure 7 Schematic diagram of the magnetic slot and permanent magnet assembly;

[0036] Figure 8 This is a schematic diagram of the magnetic ring structure and rotor shaft assembly;

[0037] Figure 9 Schematic diagram of the magnetic ring structure and motor assembly.

[0038] Figure numerals: 11, sleeve; 12, disc; 13, magnetic slot; 14, permanent magnet; 15, connecting rib; 16, reinforcing rib; 17, first chamfered transition portion; 18, second chamfered transition portion; 19, connecting protrusion; 20, connecting groove; 21, bearing; 22, rotor shaft; 23, squirrel cage rotor; 24, motor end cover; 25, plastic shell; 26, stator. DETAILED DESCRIPTION

[0039] The following describes preferred embodiments of the present invention in more detail with reference to the accompanying drawings. Although preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0040] The terms used in this utility model are for the purpose of describing specific embodiments only and are not intended to limit the utility model. As used in this utility model and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0041] It should be understood that although the terms "first", "second", "third", etc. may be used in the present invention to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0042] Example 1

[0043] like Figures 1-9 As shown, the magnetic ring structure provided in the present application includes a sleeve 11, an annular disk 12 and a permanent magnet 14. The sleeve 11 is sleeved on the outside of the rotor shaft 22. The outer wall of the sleeve 11 away from the rotor shaft 22 is connected to the inner wall of the disk 12 through a plurality of connecting ribs 15. The outer wall of the disk 12 away from the sleeve 11 is provided with a magnetic groove 13, and the permanent magnet 14 is nested inside the magnetic groove 13.

[0044] In the present application, the connecting rib 15 can realize a stable connection between the sleeve 11 and the disc 12. At the same time, when the magnetic ring structure rotates along with the rotor shaft 22, the connecting rib 15 can also be used as a heat dissipation blade to dissipate heat and cool the magnetic ring structure, reduce the temperature of the accessory parts of the magnetic ring structure, thereby improving the service life of the magnetic ring structure and ensuring the operational stability of the magnetic ring structure.

[0045] In the present application, the two ends of the sleeve 11 are adjacent to the motor end cover 24 and the rotor respectively. In this way, a heat dissipation hole can be set in the motor end cover 24. When the connecting ribs 15 rotate with the rotor shaft 22, since there are multiple connecting ribs 15, they can stir the air between the disc 12 and the sleeve 11, drive the air to flow, and then drive the hot air circulation and rotation of the rotor and the magnetic ring structure accessories, and finally dissipate through the heat dissipation holes in the motor end cover 24, thereby realizing the cooling and heat dissipation function of the magnetic ring structure by the connecting ribs 15.

[0046] In the present application, there is no need to provide additional heat dissipation holes in the motor end cover 24. Instead, a gap is reserved at the connection position between the motor end cover 24 and the rotor shaft 22, and the gap can achieve heat dissipation.

[0047] It should be noted that simply providing heat dissipation holes in the motor end cover 24 or reserving gaps at the connection of the motor end cover 24 will not achieve the good heat dissipation effect of the present application. Without the connecting ribs 15 of the present application, during the rotation of the rotor shaft 22, the hot air near the magnetic ring structure cannot be driven to rotate, that is, the hot air cannot flow, and the hot air accumulates near the magnetic ring structure, and cannot be effectively conducted to the air through the heat dissipation holes provided in the motor end cover 24 or the reserved gaps at the connection of the motor end cover 24.

[0048] In the present application, the sleeve 11 is sleeved on the outside of the rotor shaft 22 to achieve a fixed connection between the entire magnetic ring structure and the rotor shaft 22. During the rotation of the rotor shaft 22, the entire magnetic ring structure rotates with the rotor shaft 22. In the present application, the ring is used to place the permanent magnet 14. By providing a magnetic groove 13 on the outside of the disk 12 to form a space for accommodating the permanent magnet 14, the amount of permanent magnet 14 used can be reduced, thereby reducing the cost of the magnetic ring structure.

[0049] The connecting ribs 15 in this application have the following three functions:

[0050] First, the connecting ribs 15 are used to achieve a stable connection between the sleeve 11 and the disc 12, ensuring that the sleeve 11 and the disc 12 form a unified whole and can improve the firmness of the magnetic ring structure during rotation.

[0051] Second, there are multiple connecting ribs 15, which avoids the need for solid filling between the sleeve 11 and the disc 12. This can reduce the weight of the magnetic ring structure, reduce the amount of permanent magnets 14 used, and reduce the cost of the magnetic ring structure.

[0052] Third, there are multiple connecting ribs 15 that are independent of each other. During the rotation of the magnetic ring structure, the connecting ribs 15 can be used as fan blades, that is, the connecting ribs 15 can drive the air between the disk 12 and the bushing 11 to circulate and rotate, dissipate heat from the magnetic ring structure, reduce the temperature of the components near the magnetic ring structure, and thus extend the service life of the magnetic ring structure and ensure the operating stability of the magnetic ring structure.

[0053] Embodiment 2

[0054] As Figures 1-9 shown, the magnetic ring structure provided by the present application includes a bushing 11, an annular disk 12, and a permanent magnet 14. The bushing 11 is sleeved outside the rotor shaft 22. The outer wall of the bushing 11 away from the rotor shaft 22 is connected to the inner wall of the disk 12 through a plurality of connecting ribs 15. A magnetic groove 13 is provided on the outer wall of the disk 12 away from the bushing 11, and the permanent magnet 14 is nested inside the magnetic groove 13.

[0055] Furthermore, in the present application, the top and bottom ends of the connecting rib 15 are flush with the top and bottom ends of the disk 12 respectively. The angle between the plane between the top and bottom ends of the connecting rib 15 and the plane where the top end of the disk 12 is located is a, and 0° < a ≤ 90°. The top end of the disk 12 is perpendicular to the axis of the bushing 11.

[0056] In the present application, the top end of the disk 12 is defined as: on the plane perpendicular to the axis of the bushing 11, the end of the disk 12 close to the motor end cover 24, and the top end of the disk 12 is a planar annular structure. The bottom end of the disk 12 in the present application is defined as: on the plane perpendicular to the axis of the bushing 11, the end of the disk 12 close to the squirrel-cage rotor 23, and the bottom end of the disk 12 is a planar annular structure. As Figure 1 and Figure 4 shown, the top end of the disk 12 refers to the upper surface of the disk 12 in the vertical direction, and the bottom end of the disk 12 refers to the lower surface of the disk 12 in the vertical direction.

[0057] In the present application, the top end of the connecting rib 15 is defined as: on the plane perpendicular to the axis of the bushing 11, the end of the connecting rib 15 close to the motor end cover 24. The bottom end of the connecting rib 15 in the present application is defined as: on the plane perpendicular to the axis of the bushing 11, the end of the connecting rib 15 close to the squirrel-cage rotor 23. As Figure 1 and Figure 4 shown, the top end of the connecting rib 15 refers to the upper surface of the connecting rib 15 in the vertical direction, and the bottom end of the connecting rib 15 refers to the lower surface of the connecting rib 15 in the vertical direction. As Figure 1 and Figure 4 shown, the top end and the bottom end of the connecting rib 15 refer to the two side ends of the plane between the top end and the bottom end of the connecting rib 15.

[0058] In the present application, the connecting member is a flat plate-like structure with a certain thickness, and the angle between the connecting rib 15 of the flat plate-like structure and the top of the disc 12 needs to be greater than 0° and less than 90°. When the angle between the connecting rib 15 of the flat plate-like structure and the top of the disc 12 is equal to 0°, that is, the connecting rib 15 of the flat plate-like structure is parallel to the top of the disc 12 or the bottom of the disc 12, at this time, during the rotation of the connecting rib 15, the air between the sleeve 11 and the disc 12 cannot be fully and effectively stirred. Similarly, when the angle between the connecting rib 15 of the flat plate-like structure and the top of the disc 12 is equal to 90°, that is, the connecting rib 15 of the flat plate-like structure is perpendicular to the top of the disc 12 or the bottom of the disc 12, at this time, during the rotation of the connecting rib 15, the air between the sleeve 11 and the disc 12 cannot be fully and effectively stirred. Therefore, the present application sets a connecting rib 15 of a flat-plate structure at an angle relative to the top of the disc 12, so that a fan structure similar to a fan blade can be formed between the sleeve 11 and the disc 12. When the connecting rib 15 rotates with the rotor shaft 22, the connecting rib 15 similar to the fan blade can fully and effectively stir the air between the sleeve 11 and the disc 12, thereby achieving a better cooling and heat dissipation effect.

[0059] Furthermore, in the present application, the plurality of connecting ribs 15 are evenly distributed on the outer side wall of the shaft sleeve 11 along the circumference of the shaft sleeve 11 .

[0060] like Figure 1 As shown, the angles between the connecting ribs 15 of the plurality of flat plate structures and the top of the disk 12 can be equal, for example, all 45°. Alternatively, the angles between the connecting ribs 15 of the plurality of flat plate structures and the top of the disk 12 can be unequal, for example, distributed between 30° and 75°. This does not affect the air agitation effect of the connecting ribs 15. Furthermore, in the present application, one end of the connecting rib 15 is fixed to the outer wall of the sleeve 11, and the other end is fixed to the inner wall of the disk 12. The ends of the connecting rib 15 are flush with the ends of the disk 12, that is, in a direction parallel to the axis of the rotor shaft 22, the connecting rib 15 completely fills the inner wall of the disk 12. This ensures that the connecting rib 15 is as large as possible in a direction perpendicular to the axis of the rotor shaft 22, achieving better heat dissipation. Furthermore, the present application specifies that the connecting ribs 15 are evenly distributed along the circumferential direction of the sleeve 11, which ensures uniform heat dissipation during rotation and achieves uniform and effective heat dissipation and cooling between the sleeve 11 and the disk 12.

[0061] Furthermore, in the direction of the axial centerline of the sleeve 11, the thickness of the sleeve 11 is greater than the thickness of the disc 12, and the bottom end of the disc 12 is flush with the bottom end of the sleeve 11; a first chamfered transition portion 17 is provided at the bottom end of the disc 12, and the cross-sectional area of ​​the first chamfered transition portion 17 gradually increases from the bottom end of the disc 12 to the magnetic groove direction.

[0062] The application defines the top of the sleeve 11 as: on a plane perpendicular to the axis of the sleeve 11, the end of the sleeve 11 close to the motor end cover 24, the top of the sleeve 11 is a flat ring structure. The application defines the bottom of the sleeve 11 as: on a plane perpendicular to the axis of the sleeve 11, the end of the sleeve 11 close to the squirrel cage rotor 23, the bottom of the sleeve 11 is a flat ring structure. Figure 1 and Figure 4 As shown, the top end of the sleeve 11 refers to the upper surface of the sleeve 11 in the vertical direction, and the bottom end of the sleeve 11 refers to the lower surface of the sleeve 11 in the vertical direction.

[0063] like Figure 2 and Figure 5 As shown, the bottom end of the sleeve 11 is provided with a first chamfered transition portion 17. The purpose of the first chamfered transition portion 17 is to facilitate the removal and installation of the permanent magnet 14. Since the bottom end of the sleeve 11 is flush with the bottom end of the disc 12, and the top end of the sleeve 11 is higher than the bottom end of the disc 12, and the magnetic ring is a groove provided in the middle position of the outer wall of the disc 12, in this way, the installation and removal of the permanent magnet 14 can only be carried out through the bottom end of the disc 12, which can ensure that the path during the installation and removal of the permanent magnet 14 is the shortest. In this application, the cross-sectional area of ​​the first chamfered transition portion 17 gradually increases from the bottom end of the disc 12 to the magnetic groove direction, that is, the area between the bottom end of the disc 12 and the magnetic groove 13 is set as a truncated cone structure, which not only ensures that the permanent magnet 14 will not fall off after assembly, but also ensures that the truncated cone structure can provide a guiding effect for the permanent magnet 14 during the installation and removal of the permanent magnet 14, facilitating its installation and removal.

[0064] Furthermore, a first connector is provided on the inner wall of the magnetic slot 13, and a second connector adapted to the first connector is provided on the outer wall of the permanent magnet 14. The permanent magnet 14 and the magnetic slot 13 are connected by the first connector and the second connector adapted to each other.

[0065] In the present application, the first and second connectors can be mutually adapted protrusions and depressions, or both can be positioning holes, with detachable screws passing through the positioning holes to secure the positions of the disk 12 and the permanent magnet. The present application utilizes the fixed structure of the first and second connectors to position and limit the permanent magnet 14, ensuring a secure connection between the permanent magnet 14 and the disk 12. As the magnetic ring structure rotates with the motor shaft, the two will not experience positional shifting.

[0066] Further, such as Figure 5 and Figure 6 As shown, the first connecting member is a connecting protrusion 19 located at the bottom of the magnetic slot 13 ; the second connecting member is a connecting groove 20 located on the inner side wall of the permanent magnet 14 .

[0067] In the present application, the magnetic groove 13 is located in the middle of the outer wall of the disk 12 and is distributed along the circumferential direction of the disk 12. The bottom of the magnetic groove 13 refers to the annular bottom of the magnetic groove 13 close to the shaft sleeve 11, and the side wall of the magnetic groove 13 refers to the side perpendicular to the axis of the shaft sleeve 11. The present application provides a connecting protrusion 19 at the bottom of the magnetic groove 13. The connecting protrusion 19 can be rectangular, conical, or trapezoidal. Correspondingly, a connecting groove 20 that matches the connecting protrusion 19 is provided on the surface where the permanent magnet 14 abuts the bottom of the magnetic groove 13, that is, on the inner side wall of the permanent magnet. The shape of the connecting groove 20 is similar to and matches the shape of the connecting protrusion 19, so as to achieve the limiting and fixed connection between the magnetic groove 13 and the permanent magnet 14.

[0068] Example 3

[0069] like Figures 1-9 As shown, the magnetic ring structure provided in the present application includes a sleeve 11, an annular disk 12 and a permanent magnet 14. The sleeve 11 is sleeved on the outside of the rotor shaft 22. The outer wall of the sleeve 11 away from the rotor shaft 22 is connected to the inner wall of the disk 12 through a plurality of connecting ribs 15. The outer wall of the disk 12 away from the sleeve 11 is provided with a magnetic groove 13, and the permanent magnet 14 is nested inside the magnetic groove 13.

[0070] In this application, the axis of the sleeve 11, disk 12, magnetic slot 13, and permanent magnet 14 is the same. When the magnetic ring structure and the rotor shaft 22 are assembled together, their axis coincides with the axis of the rotor shaft 22. In addition, in a direction parallel to the axis, the thickness of the sleeve 11 is greater than the thickness of the disk 12, and the bottom end of the disk 12 is flush with the bottom end of the sleeve 11.

[0071] Furthermore, in the present application, the inner side wall of the shaft sleeve 11 is provided with reinforcing ribs 16 , and the shaft sleeve 11 is connected to the rotor shaft 22 via the reinforcing ribs 16 .

[0072] like Figure 4 As shown, the reinforcing ribs 16 are distributed along the axis of the sleeve 11, and there are multiple reinforcing ribs 16, which are spaced apart on the inner wall of the sleeve 11. The reinforcing ribs 16 can be convex structures in the shape of an arc, rectangle, or trapezoid. Correspondingly, a recessed structure that matches the reinforcing ribs 16 is provided on the outer wall of the rotor shaft 22. The reinforcing ribs 16 achieve a fixed connection between the rotor shaft 22 and the sleeve 11, while also avoiding the problem of the sleeve 11 being prone to cracking due to interference fit between the rotor shaft 22 and the sleeve 11 in the prior art. The present application achieves assembly between the rotor shaft 22 and the sleeve 11 through the reinforcing ribs 16 structure, avoiding interference fit and ensuring that the two will not be offset during synchronous rotation, thereby improving the rotational stability of the magnetic ring structure.

[0073] Furthermore, second chamfered transition portions 18 are provided on inner sidewalls at both ends of the shaft sleeve 11 , and both ends of the shaft sleeve 11 are connected to the rotor shaft 22 via the second chamfered transition portions 18 .

[0074] like Figure 4 As shown, the second chamfered transition portion 18 can be provided at one end or both ends of the sleeve 11. In the direction parallel to the axial centerline of the sleeve 11, the cross-sectional area of ​​the second chamfered transition portion 18 on the side close to the center position of the sleeve 11 is larger than the cross-sectional area on the side away from the center position of the sleeve 11, that is, the top and bottom ends of the sleeve 11 are set to have a large inner diameter at the end and a small inner diameter on the inside. This helps to achieve the assembly of the rotor shaft 22 and the sleeve 11. When the sleeve 11 needs to be sleeved on the rotor shaft 22, the second chamfered transition portion 18 can be used to guide the two to achieve stable assembly. After assembly, the reinforcing ribs 16 are used to achieve limited fixation of the two.

[0075] In the present application, the sleeve 11 and the disc 12 are both made of plastic, which can reduce the amount of permanent magnet 14 used. At the same time, the plastic material can also prevent the sleeve 11 from cracking during the matching process between the sleeve 11 and the rotor shaft 22.

[0076] As another alternative, the permanent magnet 14 in the present application is annular and can be directly integrally formed on the outer arc side of the disk 12 by injection molding.

[0077] Furthermore, if Figure 8 As shown, when the magnetic ring structure and the squirrel cage rotor 23 are assembled together, the squirrel cage rotor 23 is adjacent to the lower end of the sleeve 11, and the top end of the sleeve 11 is connected to the motor end cover 24 through the bearing 21. The motor end cover 24 is provided with heat dissipation holes.

[0078] As the rotor shaft 22 rotates, the connecting ribs 15 can stir the air between the disc 12 and the sleeve 11 due to the number of connecting ribs 15, driving the air to flow, thereby driving the hot air circulation and rotation of the rotor and the magnetic ring structure accessories, and finally dissipating it through the heat dissipation holes in the motor end cover 24, thereby realizing the cooling and heat dissipation function of the connecting ribs 15 on the magnetic ring structure.

[0079] like Figure 9 As shown, when the magnetic ring structure is assembled in the motor, the sleeve 11 is sleeved on the outside of the rotor shaft 22. In the axial direction of the rotor shaft 22, the top end of the sleeve 11 is connected to the motor end cover 24 through the bearing 21, and the bottom end of the sleeve 11 is adjacent to the squirrel cage rotor 23. A stator 26 is provided on the outside of the squirrel cage rotor 23, and a plastic shell 25 is sleeved on the outside of the stator 26.

[0080] The present invention also provides a motor including the above-mentioned magnetic ring structure, in which a stable connection between the motor shaft and the permanent magnet 14 is achieved through the connecting ribs 15 between the sleeve 11 and the disk 12. At the same time, when the magnetic ring structure rotates along with the rotor shaft 22, the connecting ribs 15 can also be used as heat dissipation blades to dissipate heat and cool the magnetic ring structure, thereby reducing the temperature at the magnetic ring structure and the rotor shaft 22, thereby increasing the service life of the motor and ensuring the operating stability of the motor.

[0081] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures. In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0082] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0083] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0084] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A magnetic ring structure, characterized in that: It includes a bushing (11), an annular disc (12), and a permanent magnet (14). The bushing (11) is sleeved outside the rotor shaft (22). The outer wall of the bushing (11) away from the rotor shaft (22) is connected to the inner wall of the disc (12) through a plurality of connecting ribs (15). A magnetic groove (13) is provided on the outer wall of the disc (12) away from the bushing (11), and the permanent magnet (14) is nested inside the magnetic groove (13).

2. A magnetic ring structure according to claim 1, characterized in that: The top and bottom ends of the connecting rib (15) are flush with the top and bottom ends of the disc (12) respectively. The included angle between the plane between the top and bottom ends of the connecting rib (15) and the plane where the top end of the disc (12) is located is a, 0° < a < 90°. The top end of the disc (12) is perpendicular to the axis line of the bushing (11), and the axis line of the disc (12) coincides with the axis line of the bushing (11).

3. The magnetic ring structure according to claim 1, characterized in that: A plurality of the connecting ribs (15) are evenly distributed along the circumferential direction of the bushing (11) on the outer wall of the bushing (11).

4. The magnetic ring structure according to claim 1, characterized in that: In the axial direction of the axis line of the bushing (11), the thickness of the bushing (11) is greater than the thickness of the disc (12), and the bottom end of the disc (12) is flush with the bottom end of the bushing (11); a first chamfer transition part (17) is provided at the bottom end of the disc (12); in the direction from the bottom end of the disc (12) to the magnetic groove, the cross-sectional area of the first chamfer transition part (17) gradually increases.

5. The magnetic ring structure according to claim 1, characterized in that: A first connecting part is provided on the inner wall of the magnetic groove (13), and a second connecting part adapted to the first connecting part is provided on the outer wall of the permanent magnet (14). The permanent magnet (14) and the magnetic groove (13) are connected through the mutually adapted first connecting part and second connecting part.

6. The magnetic ring structure according to claim 5, characterized in that: The first connecting part includes a connecting convex head (19) located at the bottom of the magnetic groove (13); the second connecting part includes a connecting groove (20) located on the inner wall of the permanent magnet (14).

7. The magnetic ring structure according to claim 1, characterized in that: Reinforcing ribs (16) are provided on the inner wall of the bushing (11), and the bushing (11) is connected to the rotor shaft (22) through the reinforcing ribs (16).

8. The magnetic ring structure according to claim 1, characterized in that: Second chamfer transition parts (18) are provided on the inner walls at both ends of the bushing (11), and both ends of the bushing (11) are connected to the rotor shaft (22) through the second chamfer transition parts (18).

9. The magnetic ring structure according to claim 1, characterized in that: The top end of the bushing (11) is connected to the motor end cover (24) through a bearing (21), and heat dissipation holes are provided in the motor end cover (24).

10. A motor, characterized in that: It includes the magnetic ring structure according to any one of claims 1-9.

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