Magnet anti-falling structure and rotor assembly

Abstract

The application discloses a magnet anti-falling structure and a rotor assembly, which comprises a first component, and the first component is used for mounting a magnet assembly outside; a second component is arranged on the first component, and an installation space for accommodating the magnet assembly is formed between the first component and the second component; the installation space is used for limiting the magnet assembly along the length direction of the first component; the first component and / or the second component is provided with a stop structure, and the stop structure is used for limiting the magnet assembly from separating from the installation space along the radial direction of the first component, so that mechanical anti-falling limiting of the magnet assembly is formed, axial movement or radial falling of the magnet assembly under working conditions such as centrifugal force, vibration or impact is effectively prevented, the stability and reliability of the installation of the magnet assembly are improved, the structural strength and operation safety of the whole rotor assembly are enhanced, and the service life of the rotor assembly is prolonged.

Description

Technical Field

[0001] This invention relates to the field of motor rotor assembly anti-detachment technology, and particularly to a magnet anti-detachment structure and rotor assembly. Background Technology

[0002] Magnet assemblies are widely used in the rotor components of permanent magnet motors, generators, and other rotating equipment. Their installation reliability directly affects the operational stability and service life of the equipment. In the prior art, magnet assemblies are usually installed on the rotor core, cylinder, or other mounting components and fixed by means of adhesive bonding, interference fit, snap-fit, etc., to prevent the magnet assemblies from shifting or falling off during operation.

[0003] However, as equipment speeds increase, magnet assemblies experience significant centrifugal forces during high-speed rotation, along with vibrations, impacts, and alternating loads. Relying solely on adhesive bonding or interference fits can lead to axial movement or radial detachment of the magnet assemblies due to adhesive aging, bonding failure, increased clearance, or manufacturing tolerances. This not only affects equipment operating accuracy but also poses a risk of magnet detachment damaging the rotor assembly or even causing equipment failure. Therefore, providing a magnet anti-detachment structure that reliably mechanically limits the magnet assembly, prevents detachment, and improves installation stability and operational safety has become a pressing technical problem for those skilled in the art. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a magnet anti-detachment structure and a rotor assembly.

[0005] The technical solution adopted by this invention to solve its technical problem is: This invention provides a magnet anti-detachment structure and a rotor assembly, including a first component for mounting an external magnet assembly; a second component is provided on the first component, and an installation space for accommodating the magnet assembly is formed between the first component and the second component, the installation space being used to limit the magnet assembly along the length direction of the first component; the first component and / or the second component are provided with a stop structure, the stop structure being used to restrict the magnet assembly from detaching from the installation space along the radial direction of the first component, thereby forming a mechanical anti-detachment limit for the magnet assembly.

[0006] Preferably, the first component includes an annular cylinder and a first ring body located at the end of the cylinder along its length. The cylinder and the first ring body are respectively used to abut the ends of the magnet assembly in the thickness and length directions. The second component is fixedly or detachably mounted on the first component. This structure allows the cylinder to support the radial position of the magnet assembly, the first ring body to support the axial end of the magnet assembly, and the second component to enclose the installation space, thereby forming a stable magnet mounting cavity. This enables rapid assembly and reliable positioning of the magnet assembly, while also accommodating both fixed and detachable connection assembly methods, facilitating production assembly and subsequent maintenance and replacement.

[0007] Preferably, the stopping structure includes a second ring body located at the end of the first ring body away from the cylinder body. The cylinder body and the second ring body are located on the same side in the thickness direction of the first ring body. Both the second ring body and the magnet assembly are arranged in a ring shape. The second ring body works in conjunction with the cylinder body to clamp the magnet assembly in the radial direction. The second ring body and the cylinder body together form a covering and clamping of the outer periphery of the magnet assembly, so that the magnet assembly is mechanically limited in the radial direction. This can improve the magnet assembly's ability to resist centrifugal force, reduce the risk of radial displacement or ejection during high-speed rotation, and improve the reliability of rotor operation.

[0008] Preferably, a third ring is provided at the end of the cylinder away from the first ring along the length direction. The third ring is used to cooperate with the first ring to clamp the magnet assembly along the length direction of the magnet assembly. The third ring and the first ring act on both ends of the magnet assembly respectively, forming a double-end axial clamping of the magnet assembly. This can effectively limit the movement of the magnet assembly along the length direction, ensure the stability of the magnet assembly installation position, and avoid axial loosening or positional displacement caused by long-term vibration.

[0009] Preferably, the second ring is formed by bending and extending the first ring. The central axis of the second ring coincides with the central axis of the cylinder. The second ring has a first chamfer at one end near the cylinder and the third ring. The first chamfer is used for the second ring to clamp the magnet assembly radially in conjunction with the cylinder, and for the second ring to clamp the magnet assembly lengthwise in conjunction with the third ring. The second ring is formed by integral bending, which reduces the number of parts and connection processes, and improves the overall structural strength and manufacturing consistency. The first chamfer can provide radial clamping for the magnet assembly and also take into account axial positioning, which can optimize the contact relationship between the magnet assembly and each component, reduce assembly interference while ensuring the positioning effect, and improve assembly convenience.

[0010] Preferably, a third ring body is provided at the end of the cylinder away from the first ring body along the length direction. The third ring body is used to cooperate with the first ring body to clamp the magnet assembly along the length direction of the magnet assembly. The blocking structure includes a fourth ring body provided at the end of the third ring body away from the cylinder body. Both the fourth ring body and the magnet assembly are arranged in a ring shape. The fourth ring body has a second chamfer at one end near the cylinder and the first ring body. The second chamfer is used for the fourth ring body to clamp the magnet assembly radially in conjunction with the cylinder body, and also for the fourth ring body to clamp the magnet assembly lengthwise in conjunction with the first ring body. The fourth ring body further constitutes the anti-detachment structure at the other end of the magnet assembly. The second chamfer allows the fourth ring body to participate in radial and axial limiting at the same time, thereby forming corresponding mechanical protection at both ends of the rotor, improving the overall force balance of the magnet assembly, enhancing the constraint ability of the magnet assembly, and making the anti-detachment structure more perfect.

[0011] Preferably, a fifth ring is provided at the end of the third ring away from the fourth ring. The third ring is mounted on the cylinder via the fifth ring. The fifth ring serves as a connecting transition structure, forming a stable connection between the third ring and the cylinder. This not only improves the overall support stiffness but also optimizes the installation position and stress state of the third ring, reduces local stress concentration, and improves structural durability.

[0012] Preferably, a mating structure is provided on the side of the cylinder near the magnet assembly in the radial direction. The mating structure is an annular rib formed by the protrusion of the cylinder or an annular groove formed by the recess of the cylinder. The mating structure is used to form a preset gap between the cylinder and the magnet assembly, so that the magnet assembly and the cylinder do not have large-area contact, thereby avoiding local interference caused by dimensional errors, improving assembly reliability. At the same time, it provides adjustment space for dimensional changes of both when the temperature changes, reducing the risk of over-clamping under extreme working conditions. It can also be used as a space to accommodate external colloids.

[0013] Preferably, the third ring body and / or the fifth ring body and / or the cylinder body are provided with a first groove. The first groove is formed by recessing from the wall of the third ring body and / or the fifth ring body and / or the cylinder body. The first groove is used to accommodate external adhesive. The first groove can provide a space for the adhesive to be contained, so that the adhesive is evenly distributed and effectively retained during the assembly process, avoiding adhesive overflow or local accumulation, improving the bonding quality and bonding stability of the adhesive layer, and making the mechanical limiting and adhesive fixing work together to further enhance the fixing reliability of the magnet assembly.

[0014] A rotor assembly with magnet anti-detachment includes a magnet anti-detachment structure. After adopting the above-mentioned magnet anti-detachment structure, the rotor assembly can be reliably constrained axially and radially at the same time under high-speed rotation conditions, which improves the installation stability and anti-detachment capability of the magnet assembly, reduces the risk of rotor damage caused by magnet failure, and thus improves the overall operational reliability, service life and safety performance of the rotor assembly.

[0015] The beneficial effects of this invention are as follows: the first component is used to mount an external magnet assembly, and a second component is provided on the first component. An installation space for accommodating the magnet assembly is formed between the first component and the second component. The installation space is used to limit the magnet assembly along the length direction of the first component. At the same time, the first component and / or the second component are provided with a stop structure, which is used to restrict the magnet assembly from leaving the installation space along the radial direction of the first component. This forms a mechanical anti-detachment limiting effect on the magnet assembly that combines axial and radial forces, thereby achieving reliable fixation of the magnet assembly. This effectively prevents the magnet assembly from axially shifting or radially falling off under conditions such as centrifugal force, vibration, or impact, improves the stability and reliability of the magnet assembly installation, enhances the overall structural strength and operational safety of the rotor assembly, and extends the service life of the rotor assembly. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the magnet anti-detachment structure of the present invention; Figure 2 This is a schematic cross-sectional view of the magnet anti-detachment structure of the present invention; Figure 3 This is an exploded cross-sectional view of the magnet anti-detachment structure of the present invention; Figure 4 This is a schematic diagram of the structure of the magnet assembly of the present invention; Figure 5 This is a schematic diagram of another embodiment of the magnet anti-detachment structure of the present invention; Figure 6 This is a cross-sectional structural schematic diagram of another embodiment of the magnet anti-detachment structure of the present invention; Figure 7 This is an exploded cross-sectional view of another embodiment of the magnet anti-detachment structure of the present invention.

[0019] The reference numerals in the figures include: 1. First component; 2. Second component; 3. Magnet assembly; 10. Reinforcing structure; 11. Cylinder; 12. First ring; 13. Second ring; 130. First chamfer; 14. Fitting structure; 15. Second groove; 20. First groove; 21. Fifth ring; 22. Third ring; 23. Fourth ring; 24. Second chamfer; 25. Protruding ring. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0021] In the description of this application, terms such as "first" and "second" are used only to distinguish different objects, not to describe a specific order. Furthermore, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, "at least one" refers to one or more, and "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent: a, b, c; a and b; a and c; b and c; or a and b and c. Where a, b, and c can be single or multiple.

[0022] The terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0023] In this application, the words "exemplary" or "for example" are used to indicate that something is an example, illustration, or illustration. Any embodiment or design described as "exemplary," "for example," or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the words "exemplary," "for example," or "for example" is intended to present the relevant concepts in a specific manner.

[0024] It is understood that in this application, "when," "if," and "if" all refer to the device making a corresponding action under certain objective circumstances, and are not time-limited, nor do they require the device to make a judgment action when it is implemented, nor do they imply any other limitations.

[0025] In this application, the use of singular designations for elements is intended to represent "one or more" rather than "one and only one," unless otherwise specified.

[0026] It is understood that in the embodiments of this application, "B corresponding to A" means that there is a correspondence between A and B, and B can be determined based on A. Determining B based on A does not mean that B can be determined solely based on A; B can also be determined based on A and / or other information.

[0027] Example 1 Reference Figures 1 to 4 A magnet anti-detachment structure includes a first component 1 for mounting an external magnet assembly 3; a second component 2 is provided on the first component 1, and an installation space for accommodating the magnet assembly 3 is formed between the first component 1 and the second component 2, the installation space being used to limit the magnet assembly 3 along the length direction of the first component 1; the first component 1 and / or the second component 2 are provided with a stop structure, the stop structure being used to restrict the magnet assembly 3 from detaching from the installation space along the radial direction of the first component 1, so as to form a mechanical anti-detachment limit for the magnet assembly 3.

[0028] With the above structural arrangement, in use, the first component 1 is used to install the external magnet assembly 3. The first component 1 is provided with a second component 2. An installation space for accommodating the magnet assembly 3 is formed between the first component 1 and the second component 2. The installation space is used to limit the magnet assembly 3 along the length direction of the first component 1. At the same time, the first component 1 and / or the second component 2 are provided with a stop structure. The stop structure is used to restrict the magnet assembly 3 from leaving the installation space along the radial direction of the first component 1. This forms a mechanical anti-detachment limiting effect on the magnet assembly 3 by combining axial and radial forces, realizing reliable fixation of the magnet assembly 3. It effectively prevents the magnet assembly 3 from axially moving or radially falling off under working conditions such as centrifugal force, vibration or impact, improves the stability and reliability of the installation of the magnet assembly 3, enhances the overall structural strength and operational safety of the rotor assembly, and extends the service life of the rotor assembly.

[0029] Specifically, the first component 1 includes an annular cylindrical body 11 and a first ring body 12 located at the end of the cylindrical body 11 along its length. The cylindrical body 11 and the first ring body 12 are respectively used to abut the ends of the magnet assembly 3 in the thickness and length directions. The second component 2 is fixedly or detachably mounted on the first component 1. This structure allows the cylindrical body 11 to support the radial position of the magnet assembly 3, and the first ring body 12 to support the axial end of the magnet assembly 3. The second component 2 also encloses the installation space, thereby forming a stable magnet mounting cavity. This enables the rapid assembly and reliable positioning of the magnet assembly 3, while also accommodating both fixed and detachable connection assembly methods, facilitating production assembly and subsequent maintenance and replacement.

[0030] The term "detachable" in this technical solution means that, under specific conditions, the second component 2 and the first component 1 can be separated.

[0031] Specifically, the stopping structure includes a second ring 13 located at the end of the first ring 12 away from the cylinder 11. The cylinder 11 and the second ring 13 are located on the same side in the thickness direction of the first ring 12. The second ring 13 and the magnet assembly 3 are both arranged in a ring shape. The second ring 13 works in conjunction with the cylinder 11 to clamp the magnet assembly 3 in the radial direction. The second ring 13 and the cylinder 11 together form a covering and clamping of the outer periphery of the magnet assembly 3, so that the magnet assembly 3 is mechanically limited in the radial direction. This can improve the ability of the magnet assembly 3 to resist centrifugal force, reduce the risk of radial displacement or being thrown out during high-speed rotation, and improve the reliability of rotor operation.

[0032] The cylinder 11, the first ring 12, and the second ring 13 are an integral structure, and the material used is aluminum.

[0033] Specifically, a third ring 22 is provided at the end of the cylinder 11 away from the first ring 12 along the length direction. The third ring 22 is used to cooperate with the first ring 12 to clamp the magnet assembly 3 along the length direction of the magnet assembly 3. The third ring 22 and the first ring 12 act on both ends of the magnet assembly 3 respectively, forming a double-end axial clamping of the magnet assembly 3. This can effectively limit the movement of the magnet assembly 3 along the length direction, ensure the stability of the installation position of the magnet assembly 3, and avoid axial loosening or positional displacement caused by long-term vibration.

[0034] Specifically, the second ring 13 is formed by bending and extending the first ring 12. The central axis of the second ring 13 coincides with the central axis of the cylinder 11. The second ring 13 has a first chamfer 130 at one end near the cylinder 11 and near the third ring 22. The first chamfer 130 is used by the second ring 13 to clamp the magnet assembly 3 radially in cooperation with the cylinder 11, and also to clamp the magnet assembly 3 longitudinally in cooperation with the third ring 22. The second ring 13 is formed by integral bending, which reduces the number of parts and connection processes, and improves the overall structural strength and manufacturing consistency. The first chamfer 130 can provide radial clamping for the magnet assembly 3 and also take into account axial limiting, which can optimize the contact relationship between the magnet assembly 3 and other components, reduce assembly interference while ensuring the limiting effect, and improve assembly convenience.

[0035] The outer wall of the bend between the first ring body 12 and the cylinder 11 is provided with a chamfer, and the outer wall of the bend between the first ring body 12 and the second ring body 13 is provided with a chamfer.

[0036] Specifically, a third ring 22 is provided at the end of the cylinder 11 away from the first ring 12 along the length direction. The third ring 22 is used to cooperate with the first ring 12 to clamp the magnet assembly 3 along the length direction of the magnet assembly 3. The blocking structure includes a fourth ring 23 provided at the end of the third ring 22 away from the cylinder 11. Both the fourth ring 23 and the magnet assembly 3 are arranged in a ring shape. The fourth ring 23 has a second chamfer 24 at one end near the cylinder 11 and the first ring 12. The second chamfer 24 is used by the fourth ring 23 to clamp the magnet assembly 3 radially in conjunction with the cylinder 11, and also to clamp the magnet assembly 3 longitudinally in conjunction with the first ring 12. The fourth ring 23 further constitutes the anti-detachment structure at the other end of the magnet assembly 3. The second chamfer 24 enables the fourth ring 23 to participate in radial and axial limiting at the same time, thereby forming corresponding mechanical protection at both ends of the rotor, improving the overall force balance of the magnet assembly 3, enhancing the constraint ability of the magnet assembly 3, and making the anti-detachment structure more perfect.

[0037] The distance between the outer wall of the second ring 13 and the fourth ring 23 and the cylinder 11 is smaller than the distance between the outer wall of the magnet assembly 3 and the cylinder 11, that is, the outer wall of the magnet assembly 3 protrudes from the outer wall of the second ring 13 and the fourth ring 23.

[0038] The third ring 22 has a fourth ring 23 at the end away from the cylinder 11, and the first ring 12 has a second ring 13 at the end away from the cylinder 11. These can be implemented separately or in combination.

[0039] It is worth noting that the external magnet assembly 3 is provided with corresponding chamfers to stop at the second chamfer 24 and the first chamfer 130 on the fourth ring body 23 and / or the second ring body 13. The magnet assembly 3 is a magnet ring formed by combining several permanent magnets, and the several permanent magnets are arranged in a Heilbeck manner.

[0040] Specifically, a fifth ring 21 is provided at the end of the third ring 22 away from the fourth ring 23. The third ring 22 is mounted on the cylinder 11 via the fifth ring 21. The fifth ring 21 serves as a connecting transition structure, forming a stable connection between the third ring 22 and the cylinder 11. This not only helps to improve the overall support stiffness but also optimizes the installation position and stress state of the third ring 22, reduces local stress concentration, and improves structural durability.

[0041] The third ring 22 is interference-fitted with the cylinder 11 via the fifth ring 21. The interference fit can be achieved by having a corresponding locking protrusion and a locking groove on the third ring 22 and the cylinder 11, respectively.

[0042] Specifically, a mating structure 14 is provided on the radial side of the cylinder 11 near the magnet assembly 3. The mating structure 14 is an annular rib formed by protrusion from the cylinder 11 or an annular groove formed by recess from the cylinder 11. The mating structure 14 is used to form a preset gap between the cylinder 11 and the magnet assembly 3, so that the magnet assembly and the cylinder avoid large-area contact, thereby avoiding local interference caused by dimensional errors, improving assembly reliability. At the same time, it provides adjustment space for dimensional changes of both when the temperature changes, reducing the risk of over-clamping under extreme working conditions. It can also be used as a space to accommodate external colloids.

[0043] The cylinder 11 and / or the first ring 12 are provided with a glue injection groove. The glue injection groove is used to cooperate with the mating structure 14 to inject glue into the gap between the cylinder 11 and the magnet assembly 3. The glue injection groove is a dovetail groove provided on the cylinder 11 and / or the first ring 12. The opening size of the glue injection groove near the side of the cylinder 11 and / or the first ring 12 for injection is smaller to prevent the cured glue from being mechanically locked. When the mating structure 14 is an annular rib protruding from the cylinder 11, the rib is provided with at least a glue flow groove that runs through the length of the cylinder 11 to facilitate the flow of the glue.

[0044] Specifically, the third ring body 22 and / or the fifth ring body 21 and / or the cylindrical body 11 are provided with a first groove 20. The first groove 20 is formed by recessing from the wall of the third ring body 22 and / or the fifth ring body 21 and / or the cylindrical body 11. The first groove 20 is used to accommodate external adhesive. The first groove 20 can provide a space for the adhesive, so that the adhesive is evenly distributed and effectively retained during the assembly process, avoiding the overflow or local accumulation of adhesive, improving the bonding quality and bonding stability of the adhesive layer, and making the mechanical limiting and adhesive fixing work together to further enhance the fixing reliability of the magnet assembly 3.

[0045] In this technical solution, the first tank 20 is used to accommodate adhesive dispensing for auxiliary fixation.

[0046] The fifth ring 21, the third ring 22, the fourth ring 23, the second chamfer 24, and the convex ring 25 are integral structures.

[0047] A rotor assembly with magnet anti-detachment includes the aforementioned magnet anti-detachment structure. After adopting the aforementioned magnet anti-detachment structure, the rotor assembly can be reliably constrained axially and radially simultaneously under high-speed rotation conditions, thereby improving the installation stability and anti-detachment capability of the magnet assembly 3, reducing the risk of rotor damage caused by magnet failure, and thus improving the overall operational reliability, service life and safety performance of the rotor assembly.

[0048] A reinforcing structure 10 is provided on the side of the cylinder 11 that is radially away from the magnet assembly 3. The reinforcing structure 10 is used to improve the mechanical strength of the cylinder 11 and can also serve as other auxiliary components.

[0049] Example 2 Embodiment 2 of this application can be implemented alone or in combination with Embodiment 1 described above, and this application does not impose any restrictions.

[0050] See Figure 1-7 Compared with Embodiment 1, the main difference is that the cylinder 11 is provided with a second groove 15 for accommodating the fifth ring 21. The second groove 15 is opened in an annular shape and is opened along the radial direction of the cylinder 11. The radial opening dimension of the second groove 15 is equal to the radial dimension of the fifth ring 21.

[0051] Reference Figure 3 As shown, the cylinder 11 is also provided with an annular groove, which is located on the inner wall of the cylinder 11 and is opened near the second component 2.

[0052] The third ring 22 has a protruding ring 25 on the side near the cylinder 11. The protruding ring 25 is used to cooperate with the fifth ring 21 to clamp the cylinder 11. The cylinder 11 has a first groove 20 for accommodating external glue at the end near the second component 2. At the same time, the end of the protruding ring 25 along the length direction of the magnet assembly 3 stops the magnet assembly 3.

[0053] Example 3 Embodiment 3 of this application can be implemented alone or in combination with the aforementioned Embodiments 1 and 2. This application does not impose any restrictions.

[0054] A magnet anti-detachment structure includes a first component 1 for mounting an external magnet assembly 3; characterized in that: a second component 2 is provided on the first component 1, and an installation space for accommodating the magnet assembly 3 is formed between the first component 1 and the second component 2, the installation space being used to limit the magnet assembly 3 along the length direction of the first component 1; the first component 1 and / or the second component 2 are provided with a stop structure, the stop structure being used to prevent the magnet assembly 3 from detaching from the installation space along the radial direction of the first component 1.

[0055] Specifically, the first component 1 includes a ring-shaped cylinder 11 and a first ring 12 disposed at the end of the cylinder 11 in the length direction. The cylinder 11 and the first ring 12 are respectively used to abut the ends of the magnet assembly 3 in the thickness and length directions. The second component 2 is fixedly or detachably disposed on the first component 1.

[0056] Specifically, the blocking structure includes a second ring body 13 located at the end of the first ring body 12 away from the cylinder body 11. The cylinder body 11 and the second ring body 13 are located on the same side in the thickness direction of the first ring body 12. The second ring body 13 and the magnet assembly 3 are both arranged in a ring shape. The second ring body 13 is used in conjunction with the cylinder body 11 to clamp the magnet assembly 3 in the radial direction of the magnet assembly 3.

[0057] Specifically, a third ring 22 is provided at the end of the cylinder 11 away from the first ring 12 along the length direction. The third ring 22 is used to cooperate with the first ring 12 to clamp the magnet assembly 3 along the length direction of the magnet assembly 3.

[0058] Specifically, the second ring 13 is formed by bending and extending the first ring 12, and the central axis of the second ring 13 coincides with the central axis of the cylinder 11.

[0059] Specifically, a third ring 22 is provided at the end of the cylinder 11 away from the first ring 12 along its length direction. The third ring 22 is used to cooperate with the first ring 12 to clamp the magnet assembly 3 along its length direction. The blocking structure includes a fourth ring 23 provided at the end of the third ring 22 away from the cylinder 11. Both the fourth ring 23 and the magnet assembly 3 are arranged in a ring shape.

[0060] The distance between the outer wall of the second ring 13 and the fourth ring 23 and the cylinder 11 is greater than the distance between the outer wall of the magnet assembly 3 and the cylinder 11.

[0061] The second ring 13 and the fourth ring 23 are used to fasten the magnet assembly 3 to the outside in the radial direction to limit the magnet assembly 3.

[0062] The above descriptions provide one or more embodiments in conjunction with specific details, but do not imply that the specific implementation of the present invention is limited to these descriptions. Any methods or structures that are similar to or identical to those of the present invention, or any technical deductions or substitutions made based on the concept of the present invention, should be considered within the scope of protection of the present invention.

Claims

1. A magnet anti-detachment structure, comprising a first component (1), the first component (1) being used to mount an external magnet assembly (3); characterized in that: The first component (1) is provided with a second component (2), and an installation space for accommodating the magnet assembly (3) is formed between the first component (1) and the second component (2). The installation space is used to limit the magnet assembly (3) along the length direction of the first component (1). The first component (1) and / or the second component (2) are provided with a stop structure, which is used to restrict the magnet assembly (3) from leaving the installation space along the radial direction of the first component (1).

2. The magnet anti-detachment structure according to claim 1, characterized in that: The first component (1) includes a ring-shaped cylinder (11) and a first ring (12) located at the end of the cylinder (11) in the length direction. The cylinder (11) and the first ring (12) are respectively used to abut the ends of the magnet assembly (3) in the thickness and length directions. The second component (2) is fixed or detachably disposed on the first component (1).

3. The magnet anti-detachment structure according to claim 2, characterized in that: The blocking structure includes a second ring (13) located at the end of the first ring (12) away from the cylinder (11). The cylinder (11) and the second ring (13) are located on the same side in the thickness direction of the first ring (12). The second ring (13) and the magnet assembly (3) are both arranged in a ring shape. The second ring (13) is used in conjunction with the cylinder (11) to clamp the magnet assembly (3) in the radial direction of the magnet assembly (3).

4. The magnet anti-detachment structure according to claim 3, characterized in that: A third ring (22) is provided at one end of the cylinder (11) away from the first ring (12) along the length direction. The third ring (22) is used to cooperate with the first ring (12) to clamp the magnet assembly (3) along the length direction of the magnet assembly (3).

5. The magnet anti-detachment structure according to claim 4, characterized in that: The second ring (13) is formed by bending and extending from the first ring (12). The central axis of the second ring (13) coincides with the central axis of the cylinder (11). The second ring (13) has a first chamfer (130) at one end near the cylinder (11) and near the third ring (22). The first chamfer (130) is used for the second ring (13) to cooperate with the cylinder (11) to clamp the magnet assembly (3) in the radial direction of the magnet assembly (3), and for the second ring (13) to cooperate with the third ring (22) to clamp the magnet assembly (3) in the length direction of the magnet assembly (3).

6. A magnet anti-detachment structure according to claim 2 or 5, characterized in that: A third ring (22) is provided at one end of the cylinder (11) away from the first ring (12) along the length direction. The third ring (22) is used to cooperate with the first ring (12) to clamp the magnet assembly (3) along the length direction of the magnet assembly (3). The stop structure includes a fourth ring (23) provided at one end of the third ring (22) away from the cylinder (11). The fourth ring (23) and the magnet assembly (3) are both arranged in a ring shape. The fourth ring (23) has a second chamfer (24) at one end near the cylinder (11) and near the first ring (12). The second chamfer (24) is used for the fourth ring (23) to cooperate with the cylinder (11) to clamp the magnet assembly (3) in the radial direction of the magnet assembly (3), and for the fourth ring (23) to cooperate with the first ring (12) to clamp the magnet assembly (3) in the length direction of the magnet assembly (3).

7. The magnet anti-detachment structure according to claim 6, characterized in that: The third ring body (22) is provided with a fifth ring body (21) at the end away from the fourth ring body (23), and the third ring body (22) is provided on the cylinder (11) via the fifth ring body (21).

8. The magnet anti-detachment structure according to claim 2, characterized in that: The cylinder (11) has a mating structure (14) on the side of the radial direction close to the magnet assembly (3). The mating structure (14) is a ring-shaped rib formed by protrusion from the cylinder (11) or a ring-shaped groove formed by recess from the cylinder (11).

9. The magnet anti-detachment structure according to claim 7, characterized in that: A first groove (20) is provided on the third ring body (22) and / or the fifth ring body (21) and / or the cylinder body (11). The first groove (20) is formed by recessing from the wall of the third ring body (22) and / or the fifth ring body (21) and / or the cylinder body (11). The first groove (20) is used to accommodate external glue.

10. A rotor assembly with magnet anti-detachment, characterized in that: Includes the magnet anti-detachment structure as described in any one of claims 1 to 9.

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