A mounting bracket for magnets in a brushless external rotor motor

Abstract

This application relates to the field of motor component fixing, and in particular to a fixing bracket for magnets in a brushless external rotor motor. The bracket includes a rotor housing and a fixing seat for mounting rectangular magnets. The fixing seat is disposed on the inner wall of the rotor housing and includes an annular base and fixing portions spaced circumferentially on the base. A magnet slot is formed between two adjacent fixing portions for fixing the magnet. Shear-resistant guide ribs extend from the side of the fixing portion closest to the rotor housing, and these ribs are tightly attached to the inner wall of the rotor housing. Two shear-resistant guide ribs and the base together form a glue storage groove. Each glue storage groove is located between the rotor housing and the corresponding magnet slot and is connected to the corresponding magnet slot. This structure can effectively control production costs while improving the bonding strength and connection stability between ordinary magnets and the rotor housing, preventing magnet displacement or loosening.

Description

Technical Field

[0001] This application relates to the field of motor component fixing, and in particular to a fixing bracket for magnets of brushless external rotor motors. Background Technology

[0002] With the rapid advancement of technology, modern electromechanical energy conversion systems are playing an increasingly crucial role in numerous fields such as industrial production, transportation, and aerospace. As the core power unit of modern electromechanical energy conversion systems, brushless external rotor motors possess unparalleled advantages due to their compact topology design, high-efficiency electromechanical coupling characteristics, and excellent low-speed torque density. In smart homes, brushless external rotor motors enable intelligent control and energy-saving operation of home appliances, while in medical devices, they facilitate the high-precision operation of medical equipment. Their widespread application not only improves production efficiency and product quality in various fields but also greatly promotes technological innovation and industrial upgrading, bringing profound impacts to the development of human society. Existing brushless external rotors typically consist of a rotor housing and magnets bonded to the housing. The rotor housing has through holes for the motor shaft to pass through. The fixation of the magnets is particularly critical. Currently, existing magnets generally adopt a magnetic tile-type structure. This structure cleverly utilizes the unique shape and magnetic characteristics of the magnetic tile itself, allowing it to perfectly fit the rotor housing. Specifically, the special shape of the magnetic tile better adapts to the internal spatial layout of the motor, while its magnetic properties help achieve a reasonable distribution of the magnetic field, thereby improving the motor's operating efficiency. Simultaneously, the use of adhesives, such as epoxy resin adhesives, further strengthens the connection between the magnet and the rotor housing, ensuring a tight bond. This, to a certain extent, meets the basic operational requirements of the motor and guarantees its normal operation. However, existing magnetic tile-type magnet fixing methods still exhibit significant drawbacks in practical applications. Firstly, the processing cost of magnetic tile-type magnets is higher than that of ordinary rectangular magnets. Secondly, the bonding interface between the magnet and the rotor housing is susceptible to changes in temperature, vibration, and humidity during long-term use, leading to a decline in adhesive performance and resulting in interface delamination. When the motor is under dynamic conditions such as high-speed rotation or frequent start-stop, the magnet assembly is prone to displacement or loosening, causing motor malfunctions such as motor vibration, increased noise, and output power fluctuations, affecting the normal operation of the entire system. This negative impact is particularly pronounced in fields with extremely high reliability requirements, such as new energy vehicles, high-precision industrial servo equipment, and drones. Utility Model Content

[0003] In order to ensure effective control of production costs, improve the bonding strength and connection stability between ordinary magnets and rotor housing, and prevent magnets from easily shifting or loosening, this application provides a fixing bracket for magnets of brushless external rotor motors.

[0004] This application provides a mounting bracket for magnets in a brushless external rotor motor, including a rotor housing and a mounting base for mounting cuboid magnets. The mounting base is disposed on the inner wall of the rotor housing. The mounting base includes an annular base and fixing portions spaced circumferentially on the base. A magnet slot is formed between two adjacent fixing portions for fixing the magnet. Shear-resistant guide ribs extend from the side of the fixing portion closest to the rotor housing, and these ribs are in close contact with the inner wall of the rotor housing. Two shear-resistant guide ribs and the base together form a glue storage groove. Each glue storage groove is located between the rotor housing and the corresponding magnet slot and communicates with the corresponding magnet slot. By adopting the above technical solution, the mounting base is disposed on the inner wall of the rotor housing, and a magnet slot is formed between adjacent fixing portions of the mounting base, which can be used to mount cuboid magnets, reducing processing costs compared to tile-type magnets. The anti-shear guide ribs on the fixing part are tightly attached to the inner wall of the rotor housing. The two anti-shear guide ribs and the base form a glue storage groove, which is connected to the magnet groove. The specific installation steps are as follows: First, apply an appropriate amount of glue to the inner wall of the rotor housing. Then, insert the fixing base along the inner wall of the rotor housing to the bottom of the rotor housing. Due to the special glue storage groove design of the fixing base, the glue at the corresponding position of the inner wall of the housing will not be scraped off when the fixing base is installed, which lays the groundwork for the subsequent installation and bonding of the magnet. The magnet is inserted into the magnet groove in the fixing base, and a certain pressure is applied so that the lower surface of the magnet can press against the bottom of the magnet groove. Since the side of the magnet closest to the rotor housing corresponds to the glue storage groove, the glue in the glue storage groove can firmly bond the magnet to the housing and fix the magnet firmly in the magnet groove. This avoids the magnet from shifting, loosening, or even falling off due to shear force under dynamic conditions such as high-speed rotation of the motor or frequent start-stop. Once the magnet falls off, the motor will fail and cannot operate. Preferably, the magnet groove is formed by a bottom surface and two side surfaces perpendicular to the bottom surface, with the magnet's two sides respectively abutting against the two side surfaces. By adopting the above technical solution, the magnet groove, formed by a bottom surface and two side surfaces perpendicular to the bottom surface, with the magnet's two sides respectively abutting against the two side surfaces, allows the magnet to be stably placed within the groove. Because the side surfaces are in close contact with the magnet's sides, they limit the magnet's position from both sides, effectively preventing horizontal displacement. Simultaneously, the bottom surface provides support for the magnet, further enhancing its stability. Compared to existing magnetic tile-type magnet fixing methods, this structure avoids magnet displacement or loosening due to bonding interface issues, ensuring the magnet's position remains fixed during motor operation, thereby guaranteeing stable motor operation and reducing operational faults such as motor vibration, increased noise, and output power fluctuations. Preferably, the anti-shear guide rib is a trapezoidal platform structure. By adopting the above technical solution, the anti-shear guide rib is designed as a trapezoidal platform structure with a cross-section that is narrow at the top and wide at the bottom.When the mounting base is installed onto the inner wall of the rotor housing and adhesive is applied, the larger bottom of the trapezoidal platform structure has a larger contact area with the inner wall of the rotor housing, allowing for a more stable fit during adhesive application and preventing displacement under adhesive pressure. The inclined sides of the trapezoidal platform structure facilitate the flow of adhesive along the inclined surface into the adhesive storage tank and the magnet tank, ensuring uniform and sufficient adhesive filling. This effectively enhances the connection strength between the magnet and the mounting base and the rotor housing, thereby improving the overall fixing effect and stability of the mounting bracket for the magnet and reducing the risk of displacement or loosening of the magnet due to shear force during motor operation. Preferably, the anti-shear guide rib extends to the bottom of the base and is in close contact with the inner wall of the rotor housing. By adopting the above technical solution, with the anti-shear guide rib extending to the bottom of the base and in close contact with the inner wall of the rotor housing, the adhesive storage tank can be completely enclosed between the magnet tank and the rotor housing. When injecting adhesive into the storage tank, the adhesive will not leak from the bottom because the anti-shear guide rib is tightly fitted to the inner wall of the rotor housing. This ensures that the adhesive can fully fill the storage tank and flow into the magnet slot, achieving a stronger bond between the magnet, the mounting base, and the rotor housing. Thus, during motor operation, even under conditions such as temperature changes, vibration, humidity, or high-speed rotation and frequent start-stop cycles, it can effectively resist shear forces, preventing displacement or loosening of the magnet assembly. This avoids operational faults such as motor vibration, increased noise, and output power fluctuations, improving the reliability and stability of motor operation. Preferably, the connection between the anti-shear guide rib and the bottom of the base is an arc-shaped transition. By adopting the above technical solution, the connection between the anti-shear guide rib and the bottom of the base is set as an arc-shaped transition, avoiding stress concentration. During motor operation, vibration and torque forces are generated. If the connection is a non-arc structure such as a right angle, these forces will concentrate at the corners, causing these parts to bear greater stress and making them prone to cracking and damage. The arc-shaped transition section can evenly distribute stress, reduce localized high stress, and make the connection between the anti-shear guide rib and the base more stable and reliable, effectively improving the overall strength and stability of the fixing frame and extending its service life. Preferably, both sides of the anti-shear guide rib are provided with overflow buffer grooves, which are connected to the glue storage tank. By adopting the above technical solution, when glue is injected into the glue storage tank, if there is excessive glue overflow, the overflow buffer grooves on both sides of the anti-shear guide rib, which are connected to the glue storage tank, can flow into the overflow buffer grooves, preventing glue overflow. During assembly, interference between the moving trajectory of the fixing base and the uncured glue layer can be effectively avoided, thus ensuring the orderliness of the glue injection process and the overall cleanliness and assembly quality of the motor. Preferably, the inner wall of the annular base is provided with protruding supporting ribs. By adopting the above technical solution, the protruding supporting ribs on the inner wall of the annular base can enhance the structural strength of the annular base.Because the annular base needs to withstand the forces and vibrations generated by components such as magnets during the operation of a brushless external rotor motor, adding supporting reinforcing ribs can disperse these forces, reduce the possibility of base deformation, and thus ensure the overall stability of the fixed base structure. This improves the fixing effect of the fixing frame on the magnets and ensures the stable operation of the motor. Preferably, the supporting reinforcing ribs are annular. By adopting the above technical solution, the annular supporting reinforcing ribs can distribute stress more evenly than other shapes because the annular shape has all-round symmetry, and the pressure borne in all directions is relatively balanced when subjected to force. The fixed base is subjected to various forces during operation, such as the vibration generated by the motor operation and the force from torque transmission. This uniform stress distribution can avoid the occurrence of local stress concentration, thereby enhancing the overall structural strength and stability of the fixed base. Therefore, the annular supporting reinforcing ribs effectively improve the load-bearing capacity of the fixed base in complex working environments, reduce the risk of deformation or damage caused by uneven force, and thus improve the service life and reliability of the entire magnet fixing frame for brushless external rotor motors. Preferably, the height of the fixing part is less than the height of the magnet. By adopting the above technical solution, because the height of the fixing part is less than the height of the magnet, the top part of the magnet protrudes from the fixing part. This allows workers to more easily position and place the magnet during installation. Furthermore, when the magnet needs to be replaced or maintained, it is easier to remove it from the fixing base, reducing operational difficulty and workload, and improving the convenience of magnet installation and maintenance. Preferably, it also includes a limiting cover, which comprises an annular cover body and limiting parts spaced circumferentially on the cover body. The number of limiting parts is equal to the number of fixing parts. When the limiting cover is closed on the fixing base, each limiting part is correspondingly positioned directly above each fixing part, and the limiting parts are located between two magnets and abut against the sidewalls of the magnets. By adopting the above technical solution, the limiting cover includes an annular cover body and limiting parts spaced circumferentially, and the number of limiting parts is equal to the number of fixing parts. When the limiting cover is closed on the fixing base, the limiting parts are correspondingly positioned directly above the fixing parts. Since the limiting part is located between the two magnets and abuts against the side wall of the magnets respectively, it can further correct the placement posture of the magnets and limit the magnets in both axial and radial directions. This prevents the magnets from shifting or loosening along the axial direction under dynamic conditions such as high-speed rotation of the motor or frequent start-stop, and avoids motor operation failures caused by this, such as motor vibration, increased noise, and output power fluctuations. This improves the stability and reliability of the brushless external rotor motor.

[0005] In summary, this application includes at least one of the following beneficial technical effects:

[0006] 1. Since rectangular magnets have a simpler structure than tile-shaped magnets, using rectangular magnets instead of tile-shaped magnets can reduce the processing cost of the magnets;

[0007] 2. The design of the fixing parts spaced apart on the fixing seat increases the mechanical engagement between the magnet and the fixing seat, enhances the firmness of the magnet fixing from a physical structure perspective, and realizes the dynamic self-locking effect under axial and tangential combined loads;

[0008] 3. Through the anti-shear guide ribs and glue storage tanks set in the fixing part, after the adhesive is injected into the glue storage tank, the anti-shear guide ribs can withstand the shear force, which increases the connection stability between the magnet and the rotor housing, reduces the interface delamination phenomenon caused by the degradation of adhesive performance due to factors such as temperature changes, vibration, and humidity, and thus reduces the risk of displacement or loosening of the magnet assembly. Attached Figure Description

[0009] Figure 1 This is an exploded view of a mounting bracket for a magnet in a brushless external rotor motor according to this application;

[0010] Figure 2 This is a schematic diagram of the mounting structure of the rotor housing and mounting base for a brushless external rotor motor magnet according to this application;

[0011] Figure 3 yes Figure 2 A magnified view of point A;

[0012] Figure 4 This is a diagram of the mounting structure of a limiting cover for a magnet of a brushless external rotor motor according to this application.

[0013] Explanation of reference numerals in the attached drawings: 1. Rotor housing; 2. Fixing base; 3. Limiting cover; 4. Glue storage tank; 5. Magnet; 11. Through hole; 12. Snap-fit ​​groove; 21. Base body; 22. Fixing part; 23. Magnet groove; 24. Support reinforcing rib; 221. Anti-shear guide rib; 222. Glue overflow buffer groove; 31. Cover body; 32. Limiting part; 33. Connecting hole; 34. Snap-fit ​​protrusion. Detailed Implementation

[0014] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0015] This application provides a mounting bracket for the magnet of a brushless external rotor motor, as shown in the embodiments below. Figure 1 and Figure 2The system includes a rotor housing 1, a mounting base 2 for mounting a rectangular magnet 5, and a limiting cover 3 that can be movably fitted onto the mounting base 2. In this embodiment, the rotor housing 1 has a through hole 11 in the middle that allows the rotating shaft to pass through. The rotor housing 1 has a cylindrical structure. The mounting base 2 is located on the inner wall of the rotor housing 1, which can well adapt to the internal structure of the motor, achieving the effect of providing a stable mounting foundation for the rectangular magnet 5. Because the rectangular magnet 5 has a lower processing cost than the tile-type magnet 5, this satisfies the installation requirements of the magnet 5 while reducing costs. The mounting base 2 and the inner wall of the rotor housing 1 can be configured by first roughly placing the mounting base 2 into a suitable position inside the rotor housing 1, and then using subsequent methods such as glue injection to ensure a tight fit against the inner wall, guaranteeing a stable relative position between the two, thereby providing a stable environment for the installation of the magnet 5. Specifically, the mounting base 2 in this embodiment includes an annular seat 21 and fixing parts 22 spaced circumferentially on the seat 21. The annular base 21 is a regular circle, allowing it to fit snugly against the inner wall of the rotor housing 1. The fixing part 22 is integrally formed from the base 21. A magnet groove 23 is formed between two adjacent fixing parts 22 to fix the magnet 5. The magnet groove 23 is formed by a bottom surface and two side surfaces perpendicular to the bottom surface. The magnet 5 abuts against the two side surfaces of the groove on both sides. This structure makes the magnet 5 more stable when placed, effectively preventing radial wobbling. The regular shape of the magnet groove 23 facilitates the installation of the cuboid magnet 5, and the smooth and flat contact surface between the groove side and the magnet 5 reduces damage to the surface of the magnet 5. Here, the two sides of the magnet 5 are tightly fitted against the sides of the slot. Due to the shape limitation of the annular base 21, when the magnet 5 is placed into the magnet slot 23, there can be a gap between the two sides of the magnet 5 and the sides of the slot. When applying adhesive, some adhesive can penetrate into the gap between the two sides of the magnet 5 and the sides of the slot, ensuring the bonding stability of the magnet 5 and preventing gaps that could cause the magnet 5 to wobble, thus affecting the normal operation of the motor. (Refer to...) Figure 3Furthermore, in this embodiment, the fixing part 22 near the rotor housing 1 is provided with an anti-shear guide rib 221. The anti-shear guide rib 221 has a trapezoidal structure and is integrally formed by the fixing part 22 and the base 21. The anti-shear guide ribs on the fixing base 2 are all in close contact with the inner wall of the rotor housing 1 and can extend all the way to the bottom of the base 21. This arrangement can play a good anti-shear role and can withstand the tangential force generated by the magnet 5 during motor operation, ensuring the connection stability between the fixing base 2 and the rotor housing 1. The close contact between the anti-shear guide rib 221 and the inner wall of the rotor housing 1 is all-round contact without gaps, so that the tangential force can be effectively transmitted and dispersed during motor operation. Its extension to the bottom of the base 21 is also to increase the contact area with the base 21 and the rotor housing 1, further improving the connection stability. The connection between the anti-shear guide rib 221 and the bottom of the base 21 is an arc-shaped transition section. This arc-shaped transition section avoids stress concentration, enhances the strength and durability of the structure, and reduces the risk of damage due to long-term stress. Specifically, in this embodiment, the two anti-shear guide ribs 221 and the base 21 enclose a glue storage tank 4. Each glue storage tank 4 is located between the rotor housing 1 and the corresponding magnet slot 23, and is connected to the corresponding magnet slot 23. The function of the glue storage tank 4 is to inject adhesive. The adhesive chosen is an epoxy resin adhesive, which has strong adhesion and temperature resistance. By injecting the adhesive into the magnet slot 23 through the glue storage tank 4, at least a portion of the side of the magnet 5 closest to the rotor housing 1 and the bottom can contact the adhesive, thereby enhancing the bonding strength of the magnet 5 and better bonding the magnet 5 to the fixing base 2 and the rotor housing 1, further improving the fixing stability of the magnet 5. After the rectangular magnet 5 is installed in the magnet slot 23, the two corners of the rectangular magnet 5 closest to the rotor housing 1 abut against the rotor housing 1, but the middle cannot be tightly attached to the rotor housing. This means that a gap will be created between the rectangular magnet 5 and the inner wall of the rotor housing 1, and this gap is located precisely at the position of the glue storage tank 4. After installing the rectangular magnet 5 in the magnet slot 23, glue is injected into the glue storage tank 4. The glue fills the glue storage tank 4 between the magnet 5 and the rotor housing 1, and some of the glue will flow into the magnet slot 23 along the gap between the magnet 5 and the fixing part 22. The shape and size of the glue storage tank 4 are precisely designed to ensure that the glue is evenly distributed around the magnet 5. Specifically, in this embodiment, both sides of the anti-shear guide rib 221 are provided with overflow buffer grooves 222, which are connected to the glue storage tank 4. That is, both sides of a magnet 5 are close to the overflow buffer groove 222. When too much glue is injected, the excess glue will flow into the overflow buffer groove 222. This not only prevents the glue from overflowing and affecting other parts of the motor, thus playing a good buffering and protection role, but also bonds the glue to both sides of the magnet 5, further enhancing the bonding strength and stability of the magnet 5.

[0016] Furthermore, a supporting reinforcing rib 24 extends protruding from the inner wall of the annular base 21. The supporting reinforcing rib 24 is annular and integrally formed from the fixing part 22, the base 21, and the anti-shear guide rib 221. The supporting reinforcing rib 24 enhances the overall strength of the base 21, preventing deformation of the base 21 under stress during motor operation and ensuring the stability and reliability of the fixing base 2. Additionally, in this embodiment, the height of the fixing part 22 is less than the height of the magnet 5; this design facilitates the subsequent installation of the limiting cover 3. (Refer to...) Figure 4 Specifically, the limiting cover 3 includes an annular cover body 31 and limiting portions 32 spaced circumferentially on the cover body 31. The number of limiting portions 32 is equal to the number of fixing portions 22. The limiting portions 32 are integrally formed with the cover body 31 by injection molding. When the limiting cover 3 is closed on the fixing seat 2, each limiting portion 32 is correspondingly positioned directly above each fixing portion 22. The limiting portions 32 are located between two magnets 5 and abut against the side walls of the magnets 5, further restricting the movement of the magnets 5 in the axial direction, making the fixing of the magnets 5 more stable. The limiting cover 3 has a corresponding connecting hole 33 in the middle corresponding to the through hole 11 of the rotor housing 1, so that the limiting cover 3 and the rotor housing 1 can be coaxially installed and rotated. The outer wall of the limiting part 32 is provided with a snap-fit ​​protrusion 34. Correspondingly, the rotor housing 1 is provided with a snap-fit ​​groove 12 corresponding to the snap-fit ​​protrusion 34. Through the snap-fit ​​engagement of the snap-fit ​​protrusion 34 and the snap-fit ​​groove 12, the limiting cover 3 and the rotor housing 1 are snapped together, restricting axial displacement between the limiting cover 3 and the rotor housing 1. When the limiting cover 3 is closed, the limiting part 32 must be accurately aligned with the top of the fixing part 22 and tightly abut against the side wall of the magnet 5 to effectively restrict the axial movement of the magnet 5. The implementation principle of this embodiment is as follows:

[0017] First, the initially formed fixing seat 2, which has a circular seat body 21 and fixing parts 22 spaced around the circumference, is roughly placed in a suitable position inside the cylindrical rotor housing 1 with a through hole 11 in the middle, so that the fixing seat 2 fits tightly against the inner wall of the rotor housing 1, providing a stable foundation for the subsequent installation of the magnet 5.

[0018] Next, epoxy resin adhesive is injected into the glue storage tank 4 formed by the two anti-shear guide ribs 221 and the base 21. This adhesive has strong adhesion and temperature resistance. Then, the rectangular magnet 5 is placed into the magnet groove 23 formed by two adjacent fixing parts 22 on the fixing base 2, so that the two sides of the magnet 5 are tightly abutted against the two groove sides of the magnet groove 23 perpendicular to the bottom of the groove. At this time, the two corners of the rectangular magnet 5 near the rotor housing 1 abut against the rotor housing 1, but the middle part cannot be tightly attached to the inner wall of the rotor housing 1, thus forming a gap between the magnet 5 and the inner wall of the rotor housing 1. The adhesive has a certain fluidity, which can fill the gap between the magnet 5 and the rotor housing 1. A portion of it will also flow into the magnet groove 23 along the gap between the magnet 5 and the fixing part 22, ensuring that at least part of the side and bottom of the magnet 5 near the rotor housing 1 is in contact with the adhesive, thereby enhancing the bonding strength. At the same time, if too much adhesive is injected, the excess adhesive will flow into the overflow buffer groove 222 set on both sides of the anti-shear guide rib 221, preventing the adhesive from overflowing and affecting other parts of the motor. It can also ensure that at least part of both sides of the magnet 5 are in contact with the adhesive, further enhancing the bonding strength and stability of the magnet 5.

[0019] Finally, a certain pressure is applied to the limiting cover 3, which has a circular cover 31 and a number of limiting parts 32 that are spaced circumferentially and are integrally formed with the cover 31 by injection molding. The snap-fit ​​protrusion 34 is snapped into the snap-fit ​​groove 12 of the rotor housing 1, so that the limiting cover 3 covers the top of the fixing seat 2, and each limiting part 32 is correspondingly set directly above each fixing part 22. The limiting part 32 is located between the two magnets 5 and abuts against the side wall of the magnets 5, restricting the movement of the magnets 5 in the axial direction. At the same time, it is ensured that the connecting hole 33 in the middle of the limiting cover 3 corresponding to the through hole 11 of the rotor housing 1 is coaxial with the through hole 11 of the rotor housing 1, so that the limiting cover 3 and the rotor housing 1 are coaxially installed and rotated. The assembly of the fixing frame is completed, and the purpose of stable fixing of the magnets 5 is achieved.

[0020] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A holder for a magnet of a brushless outer rotor motor, characterized in that, The device includes a rotor housing (1) and a mounting base (2) for mounting a rectangular magnet (5). The mounting base (2) is disposed on the inner wall of the rotor housing (1). The mounting base (2) includes an annular seat body (21) and fixing parts (22) spaced circumferentially on the seat body (21). A magnet groove (23) for fixing the magnet (5) is formed between two adjacent fixing parts (22). The fixing part (22) is provided with anti-shear guide ribs (221) on the side of the fixing part (22) close to the rotor housing (1). The anti-shear guide ribs (221) are all in close contact with the inner wall of the rotor housing (1). The two anti-shear guide ribs (221) and the seat body (21) enclose a glue storage groove (4). Each glue storage groove (4) is located between the rotor housing (1) and the corresponding magnet groove (23) and is connected to the corresponding magnet groove (23).

2. The fixture of claim 1, wherein The magnetic steel groove (23) is formed by a groove bottom surface and two groove sides perpendicular to the groove bottom surface, and the two sides of the magnet (5) respectively abut against the two groove sides.

3. The fixture of claim 1, wherein The anti-shear guide rib (221) is a trapezoidal platform structure.

4. The fixture of claim 1, wherein The anti-shear guide rib (221) extends to the bottom of the base (21) and is in close contact with the inner wall of the rotor housing (1).

5. The fixture of claim 4, wherein, The connection between the anti-shear guide rib (221) and the bottom of the seat (21) is an arc-shaped transition section.

6. The fixture of claim 1, wherein Both sides of the anti-shear guide rib (221) are provided with overflow buffer grooves (222), and the overflow buffer grooves (222) are connected to the glue storage tank (4).

7. The fixing frame according to claim 1, characterized in that, The inner wall of the annular seat (21) is provided with supporting reinforcing ribs (24).

8. The fixture of claim 7, wherein, The supporting reinforcing rib (24) is circular.

9. The fixture of claim 1, wherein, The height of the fixing part (22) is less than the height of the magnet (5).

10. The fixture of claim 9, wherein, It also includes a limiting cover (3), which includes an annular cover body (31) and limiting parts (32) spaced circumferentially on the cover body (31). The number of limiting parts (32) is equal to the number of fixing parts (22). When the limiting cover (3) is closed on the fixing seat (2), each limiting part (32) is correspondingly arranged directly above each fixing part (22). The limiting parts (32) are located between the two magnets (5) and respectively abut against the side wall of the magnets (5).

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