Hub motor outer rotor segmented iron core bonding device and method

Abstract

The invention relates to a hub motor outer rotor segmented iron core bonding device and method, and belongs to the hub motor technology. The hub motor outer rotor segmented iron core bonding device comprises a bottom plate; the positioning block is arranged on the bottom plate, a key groove is formed in the positioning block, and the key groove is used for being connected with a key on an iron core; the circumferential fixing assembly is arranged on the bottom plate, and a placement groove used for installing an iron core is formed in the bottom plate in a surrounding mode; the axial fixing assembly is connected to the axial direction of the iron core, and the axial fixing assembly is used for fixing the iron core from the axial direction; and the iron core comprises a plurality of sections of core bodies. When the iron core is used, the risk of large deformation of the iron core can be reduced, circumferential movement is not prone to being caused in the press-fitting process, and therefore the multiple sections of core bodies can be conveniently and rapidly installed and fixed in a segmented mode.

Description

Technical Field

[0001] This application relates to the field of hub motor technology, and in particular to a device and method for bonding segmented iron cores of the outer rotor of a hub motor. Background Technology

[0002] With increasing environmental awareness and the pursuit of sustainable development, electric vehicles are emerging as a clean energy mode of transportation. To improve the performance and market competitiveness of electric vehicles, their drive systems need continuous optimization. Traditional drive systems suffer from long drive chains, resulting in significant energy losses during transmission and low transmission efficiency. In contrast, hub motors are directly mounted on the wheels. This innovative design minimizes the drive chain and reduces energy transmission steps, significantly improving transmission efficiency and enabling electric vehicles to utilize electrical energy more effectively, thus increasing their driving range.

[0003] However, because the motor is installed in the wheel rim, its working environment is quite complex, affected by various factors such as road surface excitation and tire imbalance. At the same time, the operation of the hub motor generates vibration and noise, and the overall vibration and noise performance of the vehicle is directly related to the vibration and noise performance of the motor. This means that the vibration and noise of the hub motor will be transmitted into the vehicle interior without any leakage, seriously affecting the comfort of the passengers.

[0004] Therefore, reducing noise and improving vibration and noise performance of hub motors has become one of the important research directions for hub motors. It has been found that segmented skewed pole cores can not only reduce noise and vibration but also improve efficiency and enhance torque performance, making them a frequently adopted solution in the design phase. However, compared to fixing segmented skewed pole cores for inner rotors, fixing segmented skewed pole cores for outer rotors is more difficult, mainly due to the following: First, the misalignment angle of the segmented skewed poles is generally between 0.5-4°. Simultaneously, the electromagnetic schemes of high-performance outer rotor hub motors are generally multi-stage logarithmic schemes, resulting in significant repulsive forces between the upper and lower magnets. For example, the repulsive force between three 40-pole cores exceeds 2000N. The cores are generally bonded using epoxy adhesive, requiring prolonged pressure to allow the adhesive to fully cure. Furthermore, during the pressing process, circumferential movement under the influence of repulsive forces can easily cause the rotor core misalignment angle to deviate from the design value, leading to… Firstly, it will only affect the motor performance and cause assembly difficulties. Secondly, the outer rotor core has the characteristics of large diameter and small radial thickness. When the outer rotor core diameter reaches 405mm and the radial thickness is only 8mm, this structure makes it easy for the radial force to squeeze and deform the core during the pressing process. Moreover, the uniform distribution of the air gap between the stator and rotor is crucial to the performance of the motor. When the roundness of the core cannot be guaranteed, it will lead to uneven air gap, which will cause the magnetic field distribution of the motor to be unbalanced and generate large harmonic vibrations during motor operation. In this case, the skewed pole design will not only not bring about an improvement in vibration and noise performance, but will actually reduce the vibration and noise performance. Summary of the Invention

[0005] This application provides a device for bonding the segmented iron core of the outer rotor of a hub motor to solve the problem of difficulty in fixing the segmented skewed pole iron core of the outer rotor in related technologies.

[0006] In a first aspect, a device for bonding segmented iron cores of an outer rotor of a hub motor is provided, comprising: a base plate; a positioning block disposed on the base plate, wherein the positioning block is provided with a keyway for connecting a key on the iron core; a circumferential fixing assembly disposed on the base plate, wherein a mounting groove for mounting the iron core is formed on the base plate; an axial fixing assembly connected to the axial direction of the iron core, wherein the axial fixing assembly is used to fix the iron core axially; and the iron core comprises multiple core segments.

[0007] By adopting the above technical solution, the positioning block and circumferential fixing component can play a positioning role in the installation of the iron core, and can also provide circumferential support force to the iron core, reducing the risk of large deformation of the iron core. In addition, the circumferential fixing component and the axial fixing component can also ensure the roundness of the iron core. During the pressing process, it is not easy to cause circumferential movement, so that the multi-section core can be conveniently fixed by segmented installation. Through the graded steps, the pressure is gradually applied to reduce the risk of large deformation of the iron core.

[0008] In some embodiments, the circumferential fixing component includes: a plurality of circumferential blocks arranged circumferentially on the base plate, the mounting groove being formed in the middle of the plurality of circumferential blocks; and a fixing bolt, one end of which passes through the circumferential blocks and is fixed to the base plate.

[0009] By adopting the above technical solution, symmetrically distributed circumferential blocks provide positioning support for the iron core in the circumferential direction, thus avoiding extrusion deformation under radial force.

[0010] In some embodiments, one side wall of each of the circumferential blocks is provided with an arc-shaped wall surface adapted to the iron core.

[0011] By adopting the above technical solution, the arc-shaped wall surface is precisely fitted with the iron core, preventing circumferential movement caused by the repulsive force of the magnet.

[0012] In some embodiments, the axial fixing assembly includes: a baffle comprising an upper plate and a lower plate, wherein the iron core is connected between the upper plate and the lower plate; a pressure plate connected to the top of the upper plate, wherein the end of the pressure plate is connected to the positioning block; and a clamping bolt passing through the pressure plate and abutting against the upper plate.

[0013] By adopting the above technical solution: the lower plate and the upper plate precisely clamp the core, the end of the pressure plate is connected to the top of the positioning block and a stable axial pressure is applied by the clamping bolt, ensuring that the iron core will not move or shift axially under the action of the repulsive force of the magnet, thereby accurately maintaining the segmented skew pole misalignment angle within the design value; at the same time, the uniform axial pressure ensures that there is no local stress concentration in the adhesive during the curing process.

[0014] In some embodiments, the axial fixing assembly further includes a fixing clip that engages between the plurality of cores.

[0015] By adopting the above technical solution, the fixing clips, by engaging with the end faces of adjacent cores, provide additional circumferential and axial mechanical locking, ensuring that the cores are precisely held in place during the bonding and curing process. In some embodiments, the fixing buckle is also connected to a buckle bolt, which passes through the buckle from top to bottom and abuts against the end face of the core.

[0016] By adopting the above technical solution, the buckle bolt passes through the fixing buckle from top to bottom and abuts against the end face of the core. By applying precise axial pressure, the mechanical locking of the fixing buckle to the adjacent end face of the core is further strengthened.

[0017] In some embodiments, a locking bolt is connected to the positioning block, and the locking bolt passes through the keyway and makes key contact with the iron core.

[0018] By adopting the above technical solution, the locking bolt passes through the keyway and makes key contact with the iron core. By applying a precise circumferential fixing force, the positioning reliability of the iron core is further ensured, and assembly errors caused by circumferential displacement are avoided.

[0019] Secondly, a method for bonding segmented iron cores of the outer rotor of a hub motor is provided, including: Provide a hub motor outer rotor segmented core bonding device as described in any of the above; in the mounting groove, two adjacent core segments are bonded by applying adhesive, and the two adjacent core segments are fixed using an axial fixing component until the adhesive is completely cured and then the axial fixing component is removed; the core segments are bonded in sequence, and adjacent core segments are fixed using an axial fixing component until multiple core segments are stacked to form a core.

[0020] By adopting the above technical solution: fixing the circumferential position of the iron core with the keyway of the positioning block and the locking bolt, supporting the large-diameter thin-walled iron core with the circumferential stop block to prevent radial deformation, applying uniform axial pressure with the axial fixing component, and providing additional mechanical locking with the fixing buckle and buckle bolt, the problems of circumferential movement, axial displacement and radial deformation caused by the repulsive force of the magnet are effectively solved, ensuring that the segmented oblique pole misalignment angle is accurately maintained during the bonding and curing process.

[0021] In some embodiments, after securing two adjacent core segments with an axial fixing assembly, any excess adhesive between the adjacent core segments is cleaned up.

[0022] By adopting the above technical solution, the excess adhesive between adjacent cores is cleaned up, effectively preventing the excess adhesive from curing and affecting subsequent core installation.

[0023] In some embodiments, grease is applied to the circumferential contact surface of the circumferential fixing assembly before bonding adjacent segments of the core with adhesive.

[0024] By adopting the above technical solution, grease is applied to the circumferential contact surface of the circumferential fixing component, which reduces the resistance when the core is inserted and prevents the overflowing adhesive from bonding the iron core to the device.

[0025] The beneficial effects of the technical solution provided in this application include: This application provides a device for bonding segmented iron cores of the outer rotor of a hub motor. Since the positioning block and the circumferential fixing component can position the iron core during installation and provide circumferential support force to the iron core, the risk of large deformation of the iron core is reduced. Furthermore, the circumferential fixing component and the axial fixing component can ensure the roundness of the iron core. During the pressing process, it is not easy to cause circumferential movement, so that the multi-segment core can be conveniently fixed by segmented installation. Through the graded steps, the pressure is gradually applied to reduce the risk of large deformation of the iron core. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of this application; Figure 2 This is a schematic diagram of the exploded structure provided in an embodiment of this application.

[0028] In the diagram: 1. Base plate; 2. Positioning block; 3. Keyway; 30. Locking bolt; 4. Iron core; 5. Circumferential fixing component; 50. Circumferential stop block; 51. Fixing bolt; 52. Arc-shaped wall surface; 6. Installation groove; 7. Axial fixing component; 70. Baffle; 700. Upper plate; 701. Lower plate; 71. Pressure plate; 72. Pressure bolt; 73. Fixing buckle; 730. Buckle bolt. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] This application provides a device for bonding the segmented iron core of the outer rotor of a hub motor, which can solve the problem of the difficulty in fixing the segmented skewed iron core of the outer rotor in related technologies.

[0031] Example 1 Reference Figure 1-2 A device for bonding segmented iron cores of an outer rotor of a hub motor is disclosed. The iron core 4 comprises multiple core segments. The device includes a base plate 1, positioning blocks 2, a circumferential fixing assembly 5, and an axial fixing assembly 7. The base plate 1 is rectangular. The positioning blocks 2 are bolted to the base plate 1. Preferably, two positioning blocks 2 are installed symmetrically, and each positioning block 2 has a keyway 3 for connecting a key on the iron core 4. The circumferential fixing assembly 5 is then installed on the base plate 1, and a mounting groove 6 for mounting the iron core 4 is formed on the base plate 1. The axial fixing assembly 7 is connected to the iron core 4 axially and is used to fix the iron core 4 axially.

[0032] In use, the positioning block 2 is installed on the base plate 1, and the circumferential fixing component 5 forms the placement groove 6. The multiple core segments are placed into the placement groove 6 in steps. During placement, the cooperation of the iron core 4 key on the positioning block 2 provides precise circumferential positioning, preventing the iron core 4 from circumferentially moving due to repulsive force during the pressing process. The circumferential fixing component 5 provides uniform support and fixation, avoiding radial deformation of the outer rotor iron core 4 during the pressing process and ensuring the roundness of the iron core 4. The axial fixing component 7 also fixes the pressing core in the axial direction during the segmented installation of the core, preventing axial displacement during the pressing process. Together with the circumferential fixing component 5, it provides stable fixed support, avoiding circumferential movement and radial deformation of the iron core 4 due to magnetic repulsive force during the pressing process. It ensures that the misalignment angle of the segmented iron core 4 is accurately maintained at the design value, thereby ensuring uniform distribution of the air gap between the stator and rotor, avoiding magnetic field imbalance and harmonic vibration, and truly realizing the noise reduction and efficiency improvement design advantages of the segmented skewed iron core 4.

[0033] In this application, after the iron core 4 on the positioning block 2 is engaged, a locking bolt 30 is connected to the positioning block 2. The locking bolt 30 passes through the keyway 3 and contacts the key of the iron core 4. By applying a precise circumferential fixing force, the positioning reliability of the iron core 4 is further ensured, and assembly errors caused by circumferential displacement are avoided.

[0034] In this application, the circumferential fixing component 5 includes circumferential blocks 50 and fixing bolts 51. Multiple circumferential blocks 50 are arranged circumferentially on the base plate 1. Preferably, four blocks are used in this embodiment. Each circumferential block 50 is rectangular, and one side wall of each block 50 has an arc-shaped wall surface 52 adapted to the iron core 4. The four circumferential blocks 50 are distributed at the four corners of the base plate 1, effectively allowing the mounting groove 6 to be formed in the middle of the multiple circumferential blocks 50. Furthermore, the four circumferential blocks 50 are arranged in two groups of two, symmetrically along the two positioning blocks 2. Finally, the fixing bolts 51 are fixed to the base plate 1 by passing one end through the circumferential blocks 50.

[0035] During use, the arc-shaped wall 52 fits precisely with the iron core 4 to prevent circumferential movement caused by the repulsive force of the magnet. On the other hand, the symmetrically distributed circumferential blocks 50 provide positioning support for the iron core 4 in the circumferential direction, avoiding extrusion deformation under radial force, ensuring uniform distribution of the air gap between the stator and rotor, eliminating magnetic field imbalance and harmonic vibration caused by uneven air gap, so that the noise reduction and efficiency enhancement design advantages of the segmented skewed pole iron core 4 can be reliably realized, significantly improving the vibration and noise performance and assembly efficiency of the hub motor.

[0036] In this application, the axial fixing assembly 7 includes a baffle 70, a pressure plate 71, and a clamping bolt 72. The baffle 70 includes an upper plate 700 and a lower plate 701. In use, the lower plate 701 is first placed on the base plate 1 and located in the mounting groove 6. After the first core section is placed in the mounting groove 6, adhesive is applied to the first core section 4. Then, the second core section is placed on top of the first core section. The upper plate 700 is then connected to the second core section, thereby connecting the core 4 between the upper plate 700 and the lower plate 701. The pressure plate 71 is then connected to the top of the positioning block 2. Finally, the clamping bolt 72 is passed through the pressure plate 71 and fixed to the lower plate 701. The lower plate 701 and the upper plate 700 precisely clamp the core. The end of the pressure plate 71 is connected to the top of the positioning block 2 and a stable axial pressure is applied through the clamping bolt 72 to ensure that the iron core 4 will not move or shift axially under the repulsive force of the magnet, thereby accurately maintaining the segmented skew pole misalignment angle within the design value. At the same time, the uniform axial pressure ensures that there is no local stress concentration in the adhesive during the curing process, avoiding uneven air gap between the stator and rotor caused by axial deformation, and significantly improving the vibration and noise performance and assembly quality of the hub motor.

[0037] In this application, to further ensure the pressing quality of the iron core 4, the axial fixing assembly 7 also includes fixing clips 73. Multiple fixing clips 73 are arranged along the circumference of the iron core 4, and are U-shaped, engaging the fixing clips 73 between multiple cores. By engaging multiple cores, the fixing clips 73 provide additional circumferential and axial mechanical locking, ensuring the cores are precisely held in place during the bonding and curing process. Additionally, locking bolts 730 are connected to the fixing clips 73, passing through them from top to bottom and contacting the end faces of the cores. By applying precise axial pressure, the locking bolts 73 further strengthen the mechanical locking of the fixing clips 73 to the end faces of adjacent cores.

[0038] Example 2 Reference Figure 1-2 A method for bonding segmented iron core 4 of the outer rotor of a hub motor is provided, comprising: providing a bonding device for segmented iron core 4 of the outer rotor of a hub motor as described in any of the above, which includes a base plate 1, positioning blocks 2, a circumferential fixing assembly 5, and an axial fixing assembly 7. Two positioning blocks 2 are provided and are connected to the base plate 1 by bolts. The positioning blocks 2 are provided with keyways 3 for connecting keys on the iron core 4. The circumferential fixing assembly 5 includes circumferential stops 50 and fixing bolts 51. Four circumferential stops 50 are arranged circumferentially on the base plate 1. Each circumferential stop 50 has an arc-shaped wall surface 52 adapted to the iron core 4 on one side wall, thereby fixing the four circumferential stops 50 to the iron core 4. The stop blocks 50 are distributed at the four top corners of the base plate 1, and the mounting grooves 6 are formed between the four circumferential stop blocks 50. The axial fixing assembly 7 includes a baffle 70, a pressure plate 71, a clamping bolt 72 and a fixing buckle 73. The baffle 70 includes an upper plate 700 and a lower plate 701. The pressure plate 71 is connected to the top of the upper plate 700, and the end of the pressure plate 71 overlaps the top of the positioning block 2. The clamping bolt 72 passes through the pressure plate 71 and is fixed to the positioning block 2. The fixing buckle 73 is snapped onto the end face of the adjacent core, and a buckle bolt 730 is also connected to the fixing buckle 73. The buckle bolt 730 passes through the buckle from top to bottom and contacts the end face of the core.

[0039] During operation, in the placement groove 6, two adjacent core segments are bonded together by applying adhesive, and the two adjacent core segments are fixed with the axial fixing component 7 until the adhesive is completely cured and then the axial fixing component 7 is removed; then the core segments are bonded together in sequence and the adjacent core segments are fixed with the axial fixing component 7 until multiple core segments are stacked to form the iron core 4.

[0040] Specifically: First, install two positioning blocks 2 and four circumferential stops 50 on the base plate 1. Then, in the mounting groove 6, place the lower plate 701 in the mounting groove 6, positioned between the four circumferential stops 50 on the base plate 1. Next, place the first core section along the keyway 3 into the mounting groove 6, and fix the key in the keyway 3 with the locking bolt 30. Then, apply adhesive to the upper surface of the first core section, and place the second core section along the keyway 3 into the mounting groove 6, positioned on the first core section. Further, place the upper plate 700 on the second core section, connect the pressure plate 71 to the top of the positioning block 2, and finally, pass the clamping screw through the pressure plate 71 and abut against the upper plate 700. Tighten the clamping bolt 72 to press down the lower plate 701, so that the lower plate 701 and the upper plate 700 precisely clamp the two core sections, applying stable axial pressure to ensure that the iron core 4 will not move axially or shift under the repulsive force of the magnet. Furthermore, during the pressing of the two core segments, a fixing clip 73 is installed between the core segments, and the fixing clip 73, in turn, secures the first and second core segments completely with clip bolts 730. Finally, after the adhesive has cured, the pressure plate 71, the upper plate 700, and the fixing clip 73 are removed. The process of applying adhesive to the second core segment, installing the third core segment, and pressing with the pressure plate 71, the upper plate 700, and the fixing clip 73 is repeated until all core segments are assembled.

[0041] Throughout the entire operation, the keyway 3 of the positioning block 2 and the locking bolt 30 fix the circumferential position of the iron core 4, the circumferential stop block 50 surrounds the mounting groove 6 to support the large-diameter thin-walled iron core 4 to prevent radial deformation, the axial fixing component 7 applies uniform axial pressure, and the fixing buckle 73 and buckle bolt 730 provide additional mechanical locking. This effectively solves the problems of circumferential movement, axial displacement and radial deformation caused by the repulsive force of the magnet, ensures that the segmented skew pole misalignment angle is accurately maintained during the bonding and curing process, thoroughly guarantees the uniform distribution of the air gap between the stator and rotor, eliminates the root cause of magnetic field imbalance and harmonic vibration, and reliably realizes the noise reduction and efficiency enhancement design advantages of the segmented skew pole iron core 4, significantly improving the vibration and noise performance and assembly efficiency of the hub motor.

[0042] In this embodiment, after fixing two adjacent core sections using the axial fixing assembly 7, it is also necessary to clean up the adhesive that has overflowed between the adjacent core sections. This is because the adhesive will overflow from the core joints under axial pressure. Cleaning up the overflowing adhesive between adjacent core sections effectively prevents the overflowing adhesive from curing and affecting the subsequent installation of the iron core 4.

[0043] Furthermore, before bonding two adjacent core sections together with adhesive, apply grease to the circumferential contact surface of the circumferential fixing component 5 to reduce the resistance when the core is inserted and to prevent the overflowing adhesive from bonding the iron core 4 to the device.

[0044] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0045] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A device for bonding segmented iron cores of the outer rotor of a hub motor, characterized in that, It includes: Base plate (1); A positioning block (2) is provided on the base plate (1), and a keyway (3) is provided on the positioning block (2), the keyway (3) being used to connect the key on the iron core (4); A circumferential fixing component (5) is provided on the base plate (1) and a mounting groove (6) for installing the iron core (4) is formed on the base plate (1). An axial fixing assembly (7) is connected in the axial direction of the iron core (4) for axially fixing the iron core (4). The iron core (4) includes multiple core segments.

2. The hub motor outer rotor segmented core bonding device as described in claim 1, characterized in that: The circumferential fixing component (5) includes: A plurality of circumferential blocks (50) are arranged circumferentially on the base plate (1), and the mounting groove (6) is formed in the middle of the plurality of circumferential blocks (50); A fixing bolt (51) is fixed to the base plate (1) by passing through the circumferential stop block (50) at one end.

3. The hub motor outer rotor segmented core bonding device as described in claim 2, characterized in that: Each of the circumferential blocks (50) has an arc-shaped wall surface (52) on one side wall that is adapted to the iron core (4).

4. The hub motor outer rotor segmented core bonding device as described in claim 1, characterized in that: The axial fixing assembly (7) includes: A baffle (70) includes an upper plate (700) and a lower plate (701), wherein the iron core (4) is connected between the upper plate (700) and the lower plate (701); A pressure plate (71) is connected to the top of the upper plate (700), and the end of the pressure plate (71) is connected to the positioning block (2); The clamping bolt (72) passes through the pressure plate (71) and abuts against the upper plate body (700).

5. The hub motor outer rotor segmented core bonding device as described in claim 4, characterized in that: The axial fixing assembly (7) further includes a fixing buckle (73) that engages between the plurality of cores.

6. The hub motor outer rotor segmented core bonding device as described in claim 5, characterized in that: The fixing buckle (73) is also connected to a buckle bolt (730), which passes through the fixing buckle (73) from top to bottom and abuts against the end face of the core.

7. The hub motor outer rotor segmented core bonding device as described in claim 1, characterized in that: A locking bolt (30) is connected to the positioning block (2), and the locking bolt (30) passes through the keyway (3) and contacts the key of the iron core (4).

8. A method for bonding segmented iron cores of the outer rotor of a hub motor, characterized in that: include: Provides a hub motor external rotor segmented iron core bonding device as described in any one of claims 1-7 above; In the placement groove (6), two adjacent core sections are bonded together by applying adhesive, and the two adjacent core sections are fixed using an axial fixing component (7) until the adhesive is completely cured and then the axial fixing component (7) is removed. The cores are bonded together in sequence, and adjacent cores are fixed using an axial fixing component (7) until multiple core segments are stacked to form an iron core (4).

9. The method for bonding segmented iron cores of the outer rotor of a hub motor as described in claim 8, characterized in that: After securing the two adjacent core segments using the axial fixing assembly (7), clean up any excess adhesive that has overflowed between the adjacent core segments.

10. The method for bonding segmented iron cores of the outer rotor of a hub motor as described in claim 8, characterized in that: Before bonding the two adjacent core segments together by applying adhesive, apply grease to the circumferential contact surface of the circumferential fixing component (5).

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