An axial flux motor rotor multi-section permanent magnet assembly device and assembly method

Abstract

The application discloses an assembling device and method for a multi-section permanent magnet of an axial flux motor rotor, and relates to the technical field of motor assembling. The device comprises a base and a traction and fitting mechanism. The base is provided with a rotor fixing portion and a tool mounting portion. The rotor fixing portion is used for radially limiting a rotor steel disc, so that the central axis of the rotor steel disc is coaxially arranged with the central axis of the tool mounting portion. The traction and fitting mechanism comprises a base, a sliding piece, an elastic piece, a drag hook component and a torsional spring piece. The base is mounted on the tool mounting portion. The sliding piece is in sliding connection with the base. The two ends of the elastic piece are connected with the base and the sliding piece, respectively. The drag hook component is rotationally connected with one end of the sliding piece. The torsional spring piece is arranged at the rotationally connected position of the drag hook component and the sliding piece, so as to exert an elastic force on the drag hook component, which deflects towards the surface of the permanent magnet, so that the drag hook component is kept in abutment with the surface of the permanent magnet. The device reduces the labor intensity of manual operation, and improves the consistency of the assembling process and the yield of magnet assembling.

Description

Technical Field

[0001] This application relates to the field of motor assembly technology, and in particular to an assembly device and method for a multi-segment permanent magnet rotor of an axial flux motor. Background Technology

[0002] In the field of unmanned aerial vehicle (UAV) propulsion, axial flux motors have been widely used due to their high torque density and flat structure. Among them, the rotor assembly, as the core functional component of the axial flux motor, directly determines the air gap magnetic flux density distribution, torque output characteristics, and overall operating performance of the motor through the arrangement, assembly precision, and assembly reliability of the permanent magnets on the rotor steel disc.

[0003] In the existing technology, the rotor permanent magnet of the axial flux motor has a multi-segment magnet scheme that uses multiple small magnets spliced ​​together to form a complete magnetic pole. This scheme not only greatly reduces the processing difficulty and manufacturing cost of a single magnet by combining and splicing small magnets, but also improves the consistency of magnetic properties and material utilization. It can also be flexibly combined to form magnetic pole structures with different curvatures to meet diverse magnetic circuit design requirements.

[0004] However, to ensure the continuity of the magnetic pole circuit and the uniformity of the air gap magnetic flux density, the splicing of multiple magnet segments requires that the mating surfaces of adjacent magnets be in close contact without any assembly gaps, and that the circumferential and radial positioning accuracy of each magnet segment be strictly controlled within the design tolerance range. However, due to the strong magnetic properties of permanent magnets, the mating surfaces of adjacent magnets are of the same polarity, which generates a strong magnetic repulsion force between them. This repulsion force increases rapidly and non-linearly as the distance between magnets decreases, making it difficult for conventional positioning fixtures to provide a continuous and balanced alignment constraint force. During the segment-by-segment assembly process, the preceding magnets, which are fixed on the steel disc, will exert continuous radial and circumferential repulsive forces on the subsequent magnets to be assembled, making it difficult for the magnets to be assembled to be accurately aligned to the designed installation position. At the same time, the uneven effect of the repulsion force can easily cause the magnets to deflect circumferentially and float axially, making it impossible to ensure full and effective contact of the mating surfaces. Ultimately, irregular assembly gaps are formed between adjacent magnets, disrupting the continuity of the magnetic circuit. Currently, the industry mostly uses manual tools to forcibly press or pre-attach magnets for assembly. This not only results in low assembly efficiency and high labor intensity, but also poor assembly consistency, which can easily lead to quality problems such as magnet misalignment and damage. Summary of the Invention

[0005] This application aims to provide an assembly device and method for multi-segment permanent magnets of an axial flux motor rotor, in order to solve the technical problems in the related art where multi-segment magnets of an axial flux motor rotor cannot fit together due to magnet repulsion during assembly, resulting in difficult installation and low efficiency.

[0006] In a first aspect, this application provides an assembly device for a multi-segment permanent magnet of an axial flux motor rotor, comprising: The base is provided with a rotor fixing part and a tooling mounting part. The rotor fixing part is used to radially limit the rotor steel disc, so that the central axis of the rotor steel disc is arranged coaxially with the central axis of the tooling mounting part. The traction and bonding mechanism includes a base, a sliding member, an elastic member, a hook component, and a torsion spring component; the base is detachably installed on the tooling mounting part, and the sliding member is slidably connected to the base; the two ends of the elastic member are respectively connected to the base and the sliding member, and are used for the reset of the sliding member; The hook component is rotatably connected to one end of the slider; the torsion spring is disposed at the rotatable connection between the hook component and the slider to apply an elastic force to the hook component to deflect toward the surface of the permanent magnet, so that the hook component remains in contact with the surface of the permanent magnet.

[0007] In some embodiments, the rotor fixing part includes an arc-shaped block disposed on the edge of the base, and a plurality of the arc-shaped blocks are arranged at intervals along the circumference of the base and enclose a receiving space for the rotor steel disc; The inner walls of the multiple arc-shaped blocks form a contour that matches the outer contour of the rotor steel disc.

[0008] In some embodiments, the tooling mounting part includes a positioning through hole opened on the base and a locking block provided on the surface of the base; the bottom surface of the base is provided with a column that mates with the positioning through hole, and the side surface is provided with a protrusion that mates with the locking block. When the column is inserted into the positioning through hole, the base can rotate around the central axis of the positioning through hole, so that the protrusion can be selectively screwed into the groove of the locking block.

[0009] In some embodiments, the projections of the plurality of arc-shaped blocks along the thickness direction of the base are located on the same circular contour, and the central axis of the circular contour is coaxial and coincides with the central axis of the positioning through hole; The sliding direction of the slider extends radially along the circular contour, so that the traction force output by the slider through the hook component is collinear with the radial repulsion force between adjacent permanent magnets.

[0010] In some embodiments, during the traction assembly process of multiple permanent magnet segments, the elastic force generated by the stretching of the elastic element is greater than the magnetic repulsion force between the permanent magnet to be assembled and the adjacent assembled permanent magnet. The torsional force of the torsion spring acting on the hook component is greater than the reverse disengagement force of the permanent magnet to be assembled on the hook component, so as to maintain the hook engagement state between the hook component and the permanent magnet throughout the traction process.

[0011] In some embodiments, the base includes guide limiting portions disposed opposite to each other, and guide grooves extending along the sliding direction of the slider are respectively provided on the opposite inner surfaces of the two guide limiting portions. The two opposite outer walls of the slider are respectively provided with guide rails adapted to the guide grooves. The guide rails are embedded in the guide grooves on the corresponding sides to form a double-sided symmetrical guide sliding fit.

[0012] In some embodiments, the slider has a receiving cavity arranged along its length, and the base is provided with a connecting block extending into the receiving cavity at one end; The elastic element is disposed in the receiving cavity, with one end connected to the end wall of the receiving cavity facing the hook member, and the other end connected to the connecting block, so that the central axis of the elastic element is collinear with the sliding direction of the sliding member.

[0013] In some embodiments, the hook member includes a hinge portion and a hook body portion integrally formed with the hinge portion; The hinge is rotatably connected to the end of the sliding member via a pin; the torsion spring is sleeved on the pin, with one end of the torsion spring abutting against the sliding member and the other end abutting against the hook body. The lower surface of the hook body has a slot structure that matches the outer contour of the permanent magnet.

[0014] Compared with the prior art, the technical solution provided in the first aspect of this application has at least the following beneficial effects or advantages: The assembly device provided in this application has a base coaxially arranged with the rotor fixing part and the tooling installation part, which makes the traction and bonding mechanism and the rotor steel disc form a stable positional correspondence. This provides a unified benchmark for the circumferential and radial alignment of each permanent magnet segment, reducing the cumulative positioning deviation during the segment-by-segment assembly process. The traction and bonding mechanism adopts a traction mode that connects the base and the sliding part with an elastic element. Relying on the characteristic that the restoring force of the elastic element changes continuously with the deformation, it adapts to the magnetic repulsion force between adjacent permanent magnets that increases nonlinearly as the distance decreases. Throughout the entire movement of the magnet to be assembled toward the assembled magnet, it continuously outputs a balanced traction force that matches the displacement state. The rotatable hook component, in conjunction with the deflection force applied by the torsion spring component, can automatically... Adapting to the outer contour surface of the permanent magnet, it simultaneously forms a composite constraint of radial hooking and axial pressing on the magnet throughout the traction process. This actively counteracts the circumferential deflection torque and axial upward floating tendency generated by magnetic repulsion, maintaining the stability of the magnet's mounting posture. It ensures that the mating sides of adjacent magnets remain parallel and aligned, guaranteeing complete surface contact of the mating surfaces and reducing the formation of irregular assembly gaps. At the same time, it avoids the magnet from bouncing or misaligning due to sudden changes in repulsion force under rigid force application. The base adopts a detachable installation form, which can flexibly adjust the layout according to different rotor specifications and magnet slot layouts, reducing the proportion of manual force application, minimizing the impact of human operation differences on assembly accuracy, and improving the consistency of the assembly quality of each magnet segment.

[0015] Secondly, this application provides a method for assembling a multi-segment permanent magnet of an axial flux motor rotor, characterized in that the assembly method is implemented based on the assembly device described in any of the first aspects above, and includes the following steps: Step S10: Place the rotor steel disc on the rotor fixing part of the base, so that the rotor steel disc and the tooling installation part are coaxial; align the base of the traction bonding mechanism with the tooling installation part, insert it, and rotate to lock it in place, thus completing the detachable fixing of the traction bonding mechanism on the base. Step S20: Rotate the rotor steel disc to align the first magnet slot to be assembled with the traction direction of the traction bonding mechanism, place the first permanent magnet in the magnet slot, and position it by having one side abut against the circumferential limiting edge of the magnet slot. Step S30: Drive the slider to slide away from the side of the permanent magnet to stretch the elastic element, hook the hook component to the outer wall of the permanent magnet to be assembled, the torsion spring applies a deflection force toward the permanent magnet to the hook component, and releases the elastic element to drive the slider to reset, and pull the permanent magnet to be assembled to move to the adjacent assembled permanent magnet to make the sides fit together. Step S40: Repeat step S30 to sequentially complete the assembly of each subsequent permanent magnet in the same magnetic steel groove until all permanent magnets in the magnetic steel groove are assembled in place. Step S50: Rotate the rotor steel disc to align the next magnet slot to be assembled with the traction direction of the traction bonding mechanism. Repeat steps S20 to S40 until all the multi-segment permanent magnets of all magnet slots on the rotor steel disc are assembled.

[0016] In some embodiments, in step S30, the elastic coefficient of the elastic element is determined by matching according to the following steps: The radial magnetic repulsion force of two adjacent permanent magnets at different circumferential distances is measured in advance to obtain the corresponding relationship between the magnetic repulsion force and the distance, and to determine the maximum radial magnetic repulsion force at the moment when the end faces of the two permanent magnets are in contact. The elastic coefficient of the elastic element is determined by combining the effective traction stroke of the sliding element with the constraint that the elastic force of the elastic element is greater than the maximum radial magnetic repulsion force when the sliding element moves to the final position. Throughout the entire process of moving the permanent magnet to be assembled, the elastic force of the elastic element is always greater than the radial magnetic repulsion between the two permanent magnets at the corresponding distance. As the distance between the permanent magnet to be assembled and the assembled permanent magnet gradually decreases, the elastic force of the elastic element decreases linearly with the decrease of its own stretching, and the value at the end of the stroke of the elastic force is greater than the magnetic repulsion at the moment when the two permanent magnets are in contact.

[0017] Compared with the prior art, the technical solution provided in the second aspect of this application has at least the following beneficial effects or advantages: The assembly method provided in this application establishes a unified assembly benchmark through the coaxial positioning and traction engagement mechanism of the rotor steel disc and the tooling installation part, ensuring the alignment accuracy between the traction direction and the extension direction of the magnet slot, and reducing the cumulative positioning deviation during the cyclic assembly process. It employs a traction method that stores and releases energy from elastic components. Relying on the inherent characteristic that the elastic restoring force continuously changes with the length of the elastic component, it adapts to the non-linearly increasing magnetic repulsion force after the permanent magnets are assembled one by one. This continuously outputs traction force throughout the entire movement stroke of the magnet to be assembled, replacing the manual force application method and avoiding the bouncing and shifting of the magnet due to sudden changes in repulsion force under rigid force application mode, thus ensuring the stability of the magnet movement process. The hook component, in conjunction with the torsion spring, applies deflection force that adaptively contacts the permanent magnet surface throughout the traction process. This creates a combined constraint of radial hooking and axial pressing, automatically counteracting the circumferential deflection torque and axial upward tendency caused by magnetic repulsion. This maintains the magnet's stable mounting posture, ensuring that the mating sides of adjacent magnets remain parallel and aligned, guaranteeing complete surface contact, reducing irregular assembly gaps, and preserving the continuity of the magnetic pole circuit. The process of segment-by-segment mating within a single slot and cyclical operation of the full-circumference magnet slot, combined with a quickly disassembled traction mating mechanism, reduces the proportion of manual alignment and force application, minimizing the impact of human error on assembly accuracy, improving the consistency of magnet assembly quality across slots, and reducing the probability of magnet misalignment or damage due to forced pressing.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the 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.

[0020] Figure 1 This is a structural schematic diagram of the assembly device and rotor steel disc provided according to the embodiments of this application; Figure 2 This is a schematic diagram of the assembly device provided according to an embodiment of this application; Figure 3 This is a first-view structural schematic diagram of the traction bonding mechanism provided according to an embodiment of this application; Figure 4 This is a schematic diagram of the base provided according to an embodiment of this application; Figure 5 This is a structural schematic diagram of the assembly device provided in the embodiments of this application during the assembly process; Figure 6 This is a schematic diagram of the base structure provided according to an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the slider provided according to an embodiment of this application; Figure 8 This is a second-view structural schematic diagram of the traction bonding mechanism provided according to an embodiment of this application; Figure 9 This is an exploded view of the traction bonding mechanism provided in the embodiments of this application; Figure 10 This is a flowchart of an assembly method provided according to an embodiment of this application.

[0021] Figure label: 100. Assembly equipment; 10. Base; 11. Rotor fixing part; 111. Arc-shaped block; 12. Tooling mounting part; 121. Positioning through hole; 122. Engaging block; 20. Traction and bonding mechanism; 21. Base; 211. Column; 212. Protrusion; 213. Guide and limiting part; 2131. Guide groove; 214. Connecting block; 22. Sliding component; 221. Guide rail; 222. Accommodating cavity; 23. Elastic element; 24. Hook component; 241. Hinge part; 242. Hook body part; 25. Torsion spring; 26. Pin; 200. Rotor steel disc; 201. Magnet slot; 202. Permanent magnet. Detailed Implementation

[0022] The embodiments of this application are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. It should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0023] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. "Multiple" means at least two, that is, two or more; "multiple" means at least two, that is, two or more.

[0024] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, a and / or b can represent three cases: a alone, a and b simultaneously, and b alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments.

[0027] For axial flux motors, the permanent magnets on the rotor in related technologies often adopt a monolithic arc-shaped magnet design. This involves machining magnet mounting slots on the rotor steel disc that match the shape of the magnet, and then embedding and fixing the monolithic arc-shaped permanent magnet into the corresponding slots. This structural design has several drawbacks. First, it is difficult to process and shape large monolithic permanent magnets. Second, it is difficult to ensure the uniformity of the magnetic properties inside the magnet during the overall magnetization process, which can easily lead to uneven local magnetic flux distribution. Third, the dimensional accuracy of the monolithic magnet is limited by the processing technology, making it difficult to match the requirements of high-precision air gap design. Fourth, if a single magnet is damaged, the entire magnet needs to be replaced, resulting in high maintenance costs and material losses.

[0028] Based on the above-mentioned shortcomings, the multi-segment magnet scheme, which uses multiple small magnets to form complete magnetic poles, has gradually become a new research and development direction. This design, through the combination and splicing of small magnets, not only significantly reduces the processing difficulty and manufacturing cost of a single magnet, but also improves the consistency of magnetic properties and material utilization. It can also be flexibly combined to form magnetic pole structures with different curvatures, adapting to diverse magnetic circuit design needs.

[0029] However, the inventors discovered that the assembly of multi-segment magnets presents problems not encountered in the assembly of a single magnet. To ensure the continuity of the magnetic pole circuit and the uniformity of the air gap magnetic flux density, the splicing of multi-segment magnets requires close contact between the mating surfaces of adjacent magnets with no assembly gaps, and the circumferential and radial positioning accuracy of each magnet segment must be strictly controlled within the design tolerance range. However, due to the strong remanence of permanent magnets, the mating surfaces of adjacent magnets are of the same polarity, resulting in a strong magnetic repulsion force between them. This repulsion force increases rapidly and non-linearly as the distance between magnets decreases, making it difficult for conventional positioning fixtures to provide a continuous and balanced alignment constraint force.

[0030] During the segmented assembly process, the preceding magnets, already fixed on the steel disc, exert continuous radial and circumferential repulsive forces on the subsequent magnets to be assembled, making it difficult for the magnets to be precisely aligned to their designed installation positions. Simultaneously, the uneven effect of the repulsive forces can cause the magnets to deflect circumferentially and float axially, failing to ensure full and effective contact of the mating surfaces. This ultimately results in irregular assembly gaps between adjacent magnets, disrupting the continuity of the magnetic circuit. If external force is used forcibly to press the magnets together, the edges are prone to chipping and breaking due to rigid collisions, causing material waste. Furthermore, the positional errors in segmented assembly accumulate, eventually leading to excessive curvature deviation and positional accuracy of the entire magnetic pole set, directly affecting the torque stability and operational reliability of the motor. Currently, the industry mostly uses manual tools to forcibly press or pre-attach magnets for assembly. This method is not only inefficient and labor-intensive, but also results in poor assembly consistency and quality problems such as magnet misalignment and damage. Existing assembly fixtures for whole magnets can only achieve the overall embedding and positioning of single magnets. They cannot counteract the dynamic magnetic repulsion force during the splicing of multiple magnet segments, nor can they guarantee the positioning accuracy and fitting gap requirements of segment splicing. Therefore, they cannot effectively solve the assembly problem of multi-segment magnets.

[0031] Based on this, the inventors propose an assembly device and assembly method for a multi-segment permanent magnet rotor of an axial flux motor to solve the technical problems existing in the above-mentioned related technologies.

[0032] Please see Figures 1 to 5 This embodiment provides an assembly device for a multi-segment permanent magnet rotor of an axial flux motor. The assembly device 100 includes a base 10 and a traction and bonding mechanism 20. The base 10 serves as the support and positioning base for the entire device. Its upper surface is integrated with a rotor fixing part 11 and a tooling mounting part 12. To effectively position the rotor steel disc 200 circumferentially, the overall outline of the base 10 can be circular. The rotor fixing part 11 can adopt an annular positioning block structure protruding from the upper surface of the base 10. Its inner circumferential surface is adapted to the outer dimension outline of the rotor steel disc 200. After the rotor steel disc 200 is placed on the base 10, its radial displacement is constrained, and it can only rotate circumferentially around its own central axis. The tooling mounting part 12 is arranged in the central area of ​​the upper surface of the base 21. Its central axis is coaxial and coincident with the central axis of the annular support area enclosed by the rotor fixing part 11, thereby ensuring that the traction direction of the traction and bonding mechanism 20 installed on the tooling mounting part 12 can precisely correspond to the extension direction of the magnet groove 201 on the rotor steel disc 200.

[0033] Combination Figure 3The traction and bonding mechanism 20 includes a base 21, a sliding member 22, an elastic member 23, a hook member 24, and a torsion spring member 25. The base 21 is assembled into the tooling mounting part 12 at the center of the base 10, and has a guide engagement structure extending along its length. The sliding member 22 is embedded in the guide engagement structure of the base 21, forming a linear sliding pair. The sliding direction of the sliding member 22 is consistent with the radial direction of the rotor. The guide engagement structure can adopt a double-sided symmetrical sliding groove and guide rail 221 engagement form, constraining the lateral offset and torsional sway of the sliding member 22 from both sides, ensuring that the movement trajectory of the sliding member 22 strictly follows the preset traction direction, resisting the lateral component force generated by magnetic repulsion, and avoiding jamming and deviation during traction.

[0034] It should be understood that the design of using elastic element 23 to provide traction force can rely on the characteristic that the elastic restoring force changes continuously with the deformation to adapt to the nonlinearly increasing magnetic repulsion force after the permanent magnets 202 are assembled one by one. It can continuously output a smooth transition of traction force throughout the entire traction stroke, avoid the magnet from bouncing and deviating due to sudden changes in repulsion force under rigid force application, and ensure the stable posture of permanent magnet 202 during movement.

[0035] Furthermore, the elastic element 23 is connected between the base 21 and the sliding element 22. The elastic element 23 can be in the form of a tension spring, with one end connected to the end of the base 21 near the rotor center and the other end connected to the corresponding position of the sliding element 22. When the sliding element 22 is subjected to an external force and slides away from the rotor center, the elastic element 23 is stretched and stores elastic potential energy. After the external force is removed, the elastic element 23 drives the sliding element 22 to reset towards the rotor center through its own elastic restoring force. The hook component 24 is rotatably connected to the end of the sliding element 22 facing the outside of the rotor through a pin 26. The torsion spring 25 is coaxially mounted on the pin 26, with both ends of the torsion spring 25 abutting against the sliding element 22 and the hook component 24 respectively, providing the hook component 24 with an elastic torque that deflects towards the surface of the permanent magnet 202. The hook component 24 has a hook end face on the side facing the permanent magnet 202 that is adapted to the outer contour of the permanent magnet 202. Under the elastic torque of the torsion spring 25, the hook end face can adaptively fit against the outer wall of the permanent magnet 202 to be assembled. At the same time, the lower structure of the hook component 24 can press against the top end face of the permanent magnet 202.

[0036] This configuration, with its rotating adaptive hook structure, simultaneously applies radial and axial clamping constraints to the permanent magnet 202 throughout the entire traction process of the hook component 24. This actively counteracts the circumferential deflection torque and axial upward tendency generated by magnetic repulsion, maintaining the stability of the permanent magnet 202's posture during movement. This ensures that the contacting sides of adjacent permanent magnets 202 remain parallel and aligned, guaranteeing complete surface contact and reducing irregular assembly gaps. The elastic torque of the torsion spring 25 ensures that the hook component 24 and the surface of the permanent magnet 202 remain in contact, preventing the hook from disengaging due to the reverse action of magnetic repulsion during traction and improving the reliability of the assembly process.

[0037] Combination Figure 5 In actual assembly, the rotor steel disc 200 is first placed into the rotor fixing part 11 on the periphery of the base 10 to complete radial positioning. Then, the base 21 of the traction and bonding mechanism 20 is inserted into the tooling installation part 12 in the center and rotated to lock and fix it, completing the initial assembly of the tooling. After the first permanent magnet 202 is placed in the magnet groove 201 and abuts against the circumferential limiting edge to complete positioning, the operator pulls the sliding part 22 outward to allow the elastic part 23 to store energy, hooking the hook component 24 onto the outside of the permanent magnet 202 to be assembled. Then, the sliding part 22 is released, the elastic part 23 releases its elastic potential energy and drives the sliding part 22 to reset towards the center. The hook component 24 pulls the permanent magnet 202 to be assembled to move smoothly towards the assembled permanent magnet 202 until the two sides are tightly attached. By repeating the hooking and traction actions described above, all permanent magnets 202 within the same magnetic slot 201 can be assembled segment by segment. After a single slot is assembled, the rotor steel disk 200 is rotated circumferentially to align the next magnetic slot 201 with the traction and bonding mechanism 20, and the cycle continues until all magnetic slots 201 are assembled. The entire assembly process requires only manual hooking and releasing operations, eliminating the need for continuous pressure, thus reducing labor intensity. Furthermore, the elastic traction and composite constraint are unaffected by differences in manual operation force, minimizing the impact of human error on assembly accuracy and improving the consistency of the assembly quality of each magnet segment.

[0038] In this embodiment, the assembly device 100 has a base 10 arranged coaxially with the rotor fixing part 11 and the tooling installation part 12, which makes the traction fitting mechanism 20 and the rotor steel disc 200 form a stable positional correspondence. This provides a unified reference for the circumferential and radial alignment of each permanent magnet 202 segment, reducing the cumulative positioning deviation during the segment-by-segment assembly process. The traction fitting mechanism 20 adopts a traction mode in which the elastic element 23 connects the base 21 and the sliding element 22. Relying on the characteristic that the restoring force of the elastic element 23 changes continuously with the deformation, it adapts to the nonlinear increase of the magnetic repulsion force between adjacent permanent magnets 202 as the distance decreases. Throughout the entire process of the magnet to be assembled moving towards the assembled magnet, it continuously outputs a balanced traction force that matches the displacement state. The rotatable hook component 24 works in conjunction with the torsion spring. The deflection force applied by component 25 can adaptively conform to the outer contour surface of the permanent magnet 202, forming a composite constraint of radial hooking and axial pressing on the magnet throughout the traction process. This actively counteracts the circumferential deflection torque and axial upward floating tendency generated by magnetic repulsion, maintaining the stability of the magnet's mounting posture. It ensures that the mating sides of adjacent magnets remain parallel and aligned, guaranteeing complete surface contact of the mating surfaces and reducing the formation of irregular assembly gaps. At the same time, it avoids the magnet from bouncing or misaligning due to sudden changes in repulsion force under rigid force application. The base 21 adopts a detachable installation form, which can flexibly adjust the layout position according to different rotor specifications and the layout of the magnet slots 201, reducing the proportion of manual force application, reducing the impact of human operation differences on assembly accuracy, and improving the consistency of the assembly quality of each section of magnet.

[0039] In some embodiments, please refer to Figure 4 and Figure 5 The rotor fixing part 11 includes an arc-shaped block 111 disposed on the edge of the base 10. Multiple arc-shaped blocks 111 are arranged at intervals along the circumference of the base 10 and enclose a space for receiving the rotor steel disk 200. The inner arc surfaces of the multiple arc-shaped blocks 111 are on the same circumferential trajectory. The central axis of the circumferential trajectory is coaxially coincident with the central axis of the central tooling mounting part 12 of the base 10. The curvature of the inner arc surface of the arc-shaped block 111 is adapted to the outer circular curvature of the rotor steel disk 200, and the inner sidewalls of the multiple arc-shaped blocks 111 enclose a contour that is adapted to the outer contour dimensions of the rotor steel disk 200.

[0040] It should be noted that the arc-shaped block 111 can be integrally formed on the edge of the base 10. In other examples, the arc-shaped block 111 can also be set as a separate component from the base 10. Through a detachable connection structure, the specific configuration can be selectively set according to actual needs to achieve mutual fixation between the arc-shaped block 111 and the base 10.

[0041] In this embodiment, a segmented, spaced arc-shaped block 111 limiting structure is adopted. After the rotor steel disc 200 is placed into the receiving space, the inner arc surfaces at multiple points form radial constraints on the rotor steel disc 200, limiting the radial offset of the rotor steel disc 200. At the same time, the rotor steel disc 200 retains the degree of freedom of circumferential rotation around its own axis, meeting the station switching requirements during slot-by-slot cyclic assembly. Compared with the limiting form of a full-circle annular flange, the gaps in the segmented arc-shaped blocks 111 can reserve operating space, making it easier for operators to complete the loading and unloading operations of the rotor steel disc 200.

[0042] In some embodiments, please refer to Figures 4 to 6 The tooling mounting part 12 and the base 21 are detachably fixed by a plug-in and rotary snap-fit ​​structure. A positioning through-hole 121 penetrating the base 10 is provided at the center of the tooling mounting part 12. A snap-fit ​​block 122 protruding from the surface of the base 10 is provided on the outer circumferential side of the positioning through-hole 121. A snap-fit ​​groove (not shown in the figure) is provided on the side of the snap-fit ​​block 122 facing the positioning through-hole 121. Correspondingly, a column 211 protrudes downward from the bottom surface of the base 21. The outer diameter of the column 211 matches the inner diameter of the positioning through-hole 121. A protrusion 212 protrudes outward from the side of the base 21, and the outer dimensions of the protrusion 212 match the snap-fit ​​groove of the snap-fit ​​block 122.

[0043] In this embodiment, the locking block 122 and the base 10 can be integrally formed, and the two locking blocks 122 can be mirrored on both sides of the positioning through hole 121, with a gap reserved between the two locking blocks 122. When installing the base 21, the column base 211 at the bottom of the base 21 is first aligned and inserted into the positioning through hole 121. The radial centering of the base 21 is achieved by the engagement of the column base 211 with the cylindrical surface of the positioning through hole 121, so that the rotation center of the base 21 coincides with the central axis of the positioning through hole 121. At this time, the base 21 can rotate freely around the central axis of the positioning through hole 121. Rotating the base 21 causes the protrusion 212 on the side to be screwed into the locking groove of the locking block 122, thereby completing the axial anti-disengagement and circumferential limiting of the base 21, and realizing the fastener-free fixation of the base 21 and the base 10. During disassembly, rotate the base 21 in the opposite direction to disengage the protrusion 212 from the locking groove, and lift the base 21 upwards to complete the disassembly. No additional tools are required throughout the process.

[0044] This design, through the combination of the column hole and the positioning through-hole 121, ensures radial positioning accuracy. The engaging groove provides circumferential and axial constraints, allowing a single mating structure to simultaneously achieve triple limiting. Both the positioning accuracy and connection reliability meet the reaction force load requirements of elastic traction, preventing the base 21 from shifting or loosening during traction operations. Compared to conventional bolt fastening and pin positioning methods, this structure significantly shortens the disassembly and assembly time of the base 21 and the time required for position adjustment, effectively reducing auxiliary time for tooling debugging and improving overall assembly efficiency.

[0045] In some embodiments, please continue reading Figure 4 and Figure 5 Multiple arc-shaped blocks 111 are projected onto the same circular contour along the thickness direction of the base 21, and the central axis of this circular contour is strictly coaxial with the central axis of the central positioning through hole 121 of the base 10. Correspondingly, the sliding direction of the sliding member 22 connected to the base 21 extends radially along the circular contour, so that the traction force output by the front end of the sliding member 22 through the hook member 24 is in the same linear direction as the radial magnetic repulsion force generated between the adjacent permanent magnets 202.

[0046] In this embodiment, the traction force and the main magnetic repulsion force are arranged radially opposite each other, so that the traction force output by the elastic element 23 can directly act on the main direction that cancels the magnetic repulsion force, minimizing the energy loss of the ineffective component force and ensuring traction efficiency. At the same time, the collinear arrangement of the force lines can avoid the magnet being subjected to additional lateral torque during traction and thus avoid deflection and misalignment. This ensures that the contact end face of the permanent magnet to be assembled 202 is always parallel and opposite to the contact end face of the assembled permanent magnet 202, ensuring full and uniform contact of the contact surfaces, reducing the generation of irregular gaps, and also reducing the influence of off-center load on the guide structure of the sliding element 22, improving the smoothness of the traction action and the durability of the tooling.

[0047] Optional, combined Figure 5 As shown, during the traction assembly process of the multi-segment permanent magnet 202, the elastic force generated by the stretching of the elastic element 23 is greater than the magnetic repulsion force between the permanent magnet 202 to be assembled and the adjacent assembled permanent magnet 202; the torsional elastic force of the torsion spring acting on the hook member 24 is greater than the reverse disengagement force of the permanent magnet 202 to be assembled on the hook member 24, so as to maintain the hooking and engaging state between the hook member 24 and the permanent magnet 202 throughout the traction process.

[0048] Specifically, the elastic element 23 and torsion spring 25 of the assembly device 100 are designed with parameters matched according to the actual stress conditions of the permanent magnet 202 assembly. Throughout the complete traction assembly stroke of the multi-segment permanent magnet 202, the elastic restoring force generated by the stretching of the elastic element 23 is always greater than the radial magnetic repulsion force between the permanent magnet 202 to be assembled and the adjacent assembled permanent magnet 202 at the corresponding distance. Simultaneously, the torsional elastic force of the torsion spring 25 acting on the hook member 24 is greater than the reverse disengagement force exerted on the hook member 24 by the magnetic repulsion force of the permanent magnet 202 to be assembled, thereby maintaining a stable hooking engagement between the hook member 24 and the permanent magnet 202 throughout the traction process.

[0049] It should be noted that the main traction force of the elastic element 23 and the anti-detachment holding force of the torsion spring 25 are designed and verified separately. The main traction force aims to overcome the radial main magnetic repulsion force, and the verification benchmark is the extreme working condition at the end of the stroke where the magnetic repulsion force is the largest and the elastic restoring force is the smallest. This ensures that even at the moment when the two permanent magnets 202 are about to come into contact, the elastic restoring force is still sufficient to overcome the peak magnetic repulsion force, ensuring that the contacting action can be fully executed. The anti-detachment holding force aims to counteract the axial pushing force caused by the magnetic repulsion force. For the unique failure mode of the hook component 24 being pushed upward by the magnetic repulsion force and prone to flipping and detachment, the corresponding torsion torque of the torsion spring 25 is matched. The two work together to ensure the reliability of the assembly process. Under the premise of meeting the assembly force requirements, the maximum tensile force of the elastic element 23 can be controlled to avoid excessive load when manually pulling the sliding part 22, while reducing the requirements for the connection strength of the base 21. This ensures both assembly reliability and ease of operation.

[0050] In some embodiments, combined with Figures 6 to 7 The base 21 is integrally formed with two opposing and spaced vertical guide limiting parts 213. The two guide limiting parts 213 are parallel to each other and extend radially along the rotor, forming the linear motion range of the sliding member 22. Each guide limiting part 213 has a guide groove 2131 recessed on its side wall facing the sliding member 22. The guide groove 2131 extends continuously along the sliding direction of the sliding member 22, and the openings of the two guide grooves 2131 are aligned and mirror-symmetrical. The sliding member 22 has two opposing outer side walls, and each outer side wall has an integrally protruding or fixed elongated guide rail 221. The cross-sectional profile of the guide rail 221 is complementary to the cavity profile of the guide groove 2131. After the guide rail 221 is embedded in the corresponding side guide groove 2131, a double-sided symmetrical groove-rail sliding pair is formed.

[0051] In this embodiment, in the assembled state, the slider 22 is constrained between two guide limiting parts 213, and the guide rails 221 on both sides maintain linear contact with the upper and lower groove walls and the bottom of the corresponding guide grooves 2131. When the hook member 24 hooks the permanent magnet 202 to be assembled and bears the magnetic repulsion force, the magnetic repulsion force is transmitted to the extended end of the slider 22 through the hook member 24, generating an overturning moment that forces the slider 22 to laterally deflect and twist around the sliding axis. The guide grooves 2131 and guide rails 221 arranged symmetrically on both sides form a constraint system that is opposite to each other. One side of the groove and rail cooperate to provide a normal reaction force to resist the deflection, and the opposite side of the groove and rail cooperate to provide a balanced reaction force in the same direction. The pair of balanced reaction forces form a couple to resist the torsion, restricting the motion freedom of the slider 22 to a single linear translation. Lateral displacement and angular deflection at any cross section of the slider 22 are suppressed. Even if the reduced spacing between adjacent permanent magnets 202 causes a sharp increase in nonlinear magnetic repulsion, accompanied by random fluctuations in the direction of the lateral force component, the slider 22 still feeds smoothly along the preset radial trajectory.

[0052] In some embodiments, combined with Figures 6 to 8 The sliding member 22 has a receiving cavity 222 along its length. The receiving cavity 222 is an internal cavity that penetrates the upper and lower surfaces of the sliding member 22, and its extension direction is consistent with the sliding direction of the sliding member 22. A connecting block 214 is fixedly installed on the base 21 at the position corresponding to the receiving cavity 222. One end of the connecting block 214 extends into the receiving cavity 222 through the bottom of the sliding member 22, and a gap is left between the peripheral wall of the connecting block 214 and the inner wall of the receiving cavity 222 to avoid motion interference. The elastic member 23 is integrally arranged inside the receiving cavity 222. The elastic member 23 is a tension spring. One end of the elastic member 23 is hooked on the end wall of the receiving cavity 222 facing the hook member 24, and the other end is hooked on the hook point of the connecting block 214 in the area where it extends into the receiving cavity 222. The position of the hook point is set so that the extension axis of the elastic member 23 is collinear with the center line of the sliding direction of the sliding member 22.

[0053] It should be noted that during the traction reset phase, the sliding member 22 moves towards the rotor center under the restoring force of the elastic member 23. The elastic member 23 undergoes tensile deformation along the axial direction of the receiving cavity 222, and the restoring force vector falls entirely on the sliding center line of the sliding member 22. Since the central axis of the elastic member 23 is collinear with the sliding direction, the restoring force does not generate an additional bending moment on the sliding member 22, and the sliding member 22 will not tend to be squeezed towards one side of the guide groove 2131 due to the offset of the elastic member 23. By placing the elastic member 23 inside and making its axis collinear with the sliding direction, the elastic restoring force is transmitted to the hook member 24, and the final traction force acting on the permanent magnet 202 to be assembled is stable and constant in direction.

[0054] In some embodiments, please refer to Figure 9The hook component 24 includes a hinge portion 241 and a hook body portion 242 integrally formed with the hinge portion 241. The hinge portion 241 is rotatably connected to the end of the sliding member 22 facing the rotor center via a pin 26. The axis of the pin 26 is arranged perpendicular to the sliding direction of the sliding member 22. A torsion spring 25 is coaxially mounted on the pin 26. The first torsion arm of the torsion spring 25 abuts against a preset limiting surface on the sliding member 22, and the second torsion arm abuts against a preset force-bearing surface on the hook body portion 242. In the assembled state, the torsion spring 25 is in a pre-tightened torsion state, continuously applying an elastic torque to the hook body portion 242 that deflects toward the surface of the permanent magnet 202. The hook body portion 242 has a lower surface on which a slot structure complementary to and adapted to the outer contour of the permanent magnet 202 to be assembled is formed. The slot structure is not a single hook point, but a constraint cavity with an envelope morphology.

[0055] In this embodiment, during assembly, the operator pulls the slider 22 outward and deflects the hook 242, causing the slot structure to engage with the permanent magnet 202 to be assembled. Driven by the elastic torque of the torsion spring 25, the inner contour surface of the slot structure actively abuts against the outer wall and top surface of the permanent magnet 202, forming a composite contact covering at least two orthogonal directions. Specifically, the portion of the slot structure opposite the outer arc surface of the permanent magnet 202 transmits radial traction force, while the portion opposite the top surface of the permanent magnet 202 applies axial holding force. During traction, the magnetic repulsion between adjacent permanent magnets 202 causes the permanent magnet 202 to tend to float axially and deflect circumferentially. The slot structure, by virtue of its conformal characteristics to the outer contour of the permanent magnet 202, embeds the permanent magnet 202 within the constraint cavity, with radial hooking and axial holding acting synchronously to actively counteract the floating force and deflection torque. The elastic torque provided by the torsion spring 25 is present throughout the traction process. Even if the permanent magnet 202 experiences slight attitude disturbances due to magnetic repulsion fluctuations, the slot structure can still maintain a follow-up fit under the compensation of the torsion spring torque.

[0056] Please see Figure 10 This embodiment provides a method for assembling a multi-segment permanent magnet of an axial flux motor rotor. The assembly method is implemented based on the assembly device described in any of the above embodiments, and includes the following steps: Step S10: Place the rotor steel disc on the rotor fixing part of the base, so that the rotor steel disc and the tooling installation part are coaxial; align the base of the traction bonding mechanism with the tooling installation part, insert it, and rotate to lock it in place, thus completing the detachable fixing of the traction bonding mechanism on the base. Step S20: Rotate the rotor steel disc to align the first magnet slot to be assembled with the traction direction of the traction bonding mechanism, place the first permanent magnet in the magnet slot, and position it by having one side abut against the circumferential limiting edge of the magnet slot. Step S30: Drive the slider to slide away from the side of the permanent magnet to stretch the elastic element, hook the hook component to the outer wall of the permanent magnet to be assembled, the torsion spring applies a deflection force toward the permanent magnet to the hook component, and releases the elastic element to drive the slider to reset, and pull the permanent magnet to be assembled to move to the adjacent assembled permanent magnet to make the sides fit together. Step S40: Repeat step S30 to sequentially complete the assembly of each subsequent permanent magnet in the same magnetic steel groove until all permanent magnets in the magnetic steel groove are assembled in place. Step S50: Rotate the rotor steel disc to align the next magnet slot to be assembled with the traction direction of the traction bonding mechanism. Repeat steps S20 to S40 until all the multi-segment permanent magnets of all magnet slots on the rotor steel disc are assembled.

[0057] The assembly method provided in this embodiment establishes a unified assembly benchmark through the coaxial positioning and traction clamping mechanism of the rotor steel disc and the tooling installation part, ensuring the alignment accuracy between the traction direction and the extension direction of the magnet slot, and reducing the cumulative positioning deviation during the cyclic assembly process. The traction method, which uses energy storage and release from elastic components, leverages the inherent characteristic that the elastic restoring force continuously changes with the length of the elastic component. This adapts to the non-linearly increasing magnetic repulsion force after the permanent magnets are assembled one by one, continuously outputting traction force throughout the entire movement stroke of the magnet to be assembled. This replaces the manual force application method, avoiding the bouncing and shifting of the magnet due to sudden changes in repulsion force under rigid force application mode, and ensuring the stability of the magnet movement process. The hook component, in conjunction with the torsion spring, applies deflection force that adaptively contacts the permanent magnet surface throughout the traction process. This creates a combined constraint of radial hooking and axial pressing, automatically counteracting the circumferential deflection torque and axial upward tendency caused by magnetic repulsion. This maintains the magnet's stable mounting posture, ensuring that the mating sides of adjacent magnets remain parallel and aligned, guaranteeing complete surface contact, reducing irregular assembly gaps, and preserving the continuity of the magnetic pole circuit. The process of segment-by-segment mating within a single slot and cyclical operation of the full-circumference magnet slot, combined with a quickly disassembled traction mating mechanism, reduces the proportion of manual alignment and force application, minimizing the impact of human error on assembly accuracy, improving the consistency of magnet assembly quality across slots, and reducing the probability of magnet misalignment or damage due to forced pressing.

[0058] In some embodiments, in step S30, the elastic coefficient of the elastic element is determined by matching according to the following steps: Step S31: Pre-measure the radial magnetic repulsion force of two adjacent permanent magnets at different circumferential distances, obtain the corresponding relationship between the magnetic repulsion force and the distance, and determine the maximum radial magnetic repulsion force at the moment when the end faces of the two permanent magnets are in contact. Specifically, the radial magnetic repulsion force values ​​of two adjacent permanent magnets at different circumferential distances are calibrated in advance using a mechanical measuring device. A curve showing the relationship between magnetic repulsion force and distance is established, and the maximum radial magnetic repulsion force value at the moment when the end faces of the two permanent magnets are brought into contact is extracted from this relationship. This maximum radial magnetic repulsion force corresponds to the most severe mechanical condition node in the entire traction process, namely the instantaneous state where the distance between the permanent magnet to be assembled and the assembled permanent magnet approaches zero and the magnetic repulsion force increases sharply to its peak value.

[0059] Step S32: Using the constraint that the elastic force of the elastic element is greater than the maximum radial magnetic repulsion when the slider moves to the final position, the elastic coefficient of the elastic element is calculated and determined in combination with the effective traction stroke of the slider. In some embodiments, throughout the entire process of moving the permanent magnet to be assembled, the elastic force of the elastic element is always greater than the radial magnetic repulsion between the two permanent magnets at the corresponding distance. As the distance between the permanent magnet to be assembled and the assembled permanent magnet gradually decreases, the elastic force of the elastic element decreases linearly with the decrease of its own stretching, and the value of the elastic force at the end of the stroke is greater than the magnetic repulsion at the moment when the two permanent magnets are in contact. Specifically, the core constraint condition is that the elastic force provided by the elastic element when the sliding element is displaced to the final contact position is greater than the aforementioned maximum radial magnetic repulsion. Combined with the effective traction stroke of the sliding element from the initial hook position to the final contact position, the elastic coefficient of the elastic element is calculated and determined. Specifically, the elastic coefficient K satisfies: K·(L0-L1)>F max Where L0 is the tensile length of the elastic element at the initial hook position, L1 is the residual tensile length of the elastic element when the sliding element reaches the final contact position, and F max This represents the maximum radial magnetic repulsion.

[0060] Throughout the traction process, the elastic component exhibits a linearly decreasing output characteristic of elastic force due to the gradual reduction in stretching. The smaller the distance between the permanent magnet to be assembled and the assembled permanent magnet, the greater the magnetic repulsion. However, the elastic force output by the elastic component at the corresponding distance is always greater than the instantaneous radial magnetic repulsion at that distance. The linear decay slope of the elastic component's output force curve is determined by the elastic coefficient, and the minimum elastic force output under residual stretching at the end of the stroke is still set to be greater than the maximum radial magnetic repulsion at the moment of contact. That is, the elastic component's force curve is generally located above the magnetic repulsion curve, and there is always a positive force difference between the two.

[0061] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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 on the invention.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0063] Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The reference to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily indicate the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0064] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An assembly device for a multi-segment permanent magnet rotor of an axial flux motor, characterized in that, include: The base is provided with a rotor fixing part and a tooling mounting part. The rotor fixing part is used to radially limit the rotor steel disc, so that the central axis of the rotor steel disc is arranged coaxially with the central axis of the tooling mounting part. The traction and bonding mechanism includes a base, a sliding member, an elastic member, a hook component, and a torsion spring component; the base is detachably installed on the tooling mounting part, and the sliding member is slidably connected to the base; the two ends of the elastic member are respectively connected to the base and the sliding member, and are used for the reset of the sliding member; The hook component is rotatably connected to one end of the slider; the torsion spring is disposed at the rotatable connection between the hook component and the slider to apply an elastic force to the hook component to deflect toward the surface of the permanent magnet, so that the hook component remains in contact with the surface of the permanent magnet.

2. The assembly device for the multi-segment permanent magnet of the axial flux motor rotor according to claim 1, characterized in that, The rotor fixing part includes an arc-shaped block disposed on the edge of the base. A plurality of the arc-shaped blocks are arranged at intervals along the circumference of the base and enclose a space for receiving the rotor steel disc. The inner walls of the multiple arc-shaped blocks form a contour that matches the outer contour of the rotor steel disc.

3. The assembly device for the multi-segment permanent magnet of the axial flux motor rotor according to claim 2, characterized in that, The tooling installation part includes a positioning through hole opened on the base and a locking block provided on the surface of the base; the bottom surface of the base is provided with a column that mates with the positioning through hole, and the side surface is provided with a protrusion that matches the locking block. When the column is inserted into the positioning through hole, the base can rotate around the central axis of the positioning through hole, so that the protrusion can be selectively screwed into the groove of the locking block.

4. The assembly device for the multi-segment permanent magnet of the axial flux motor rotor according to claim 3, characterized in that, Multiple arc-shaped blocks are projected onto the same circular contour along the thickness direction of the base, and the central axis of the circular contour is coaxial and coincides with the central axis of the positioning through hole; The sliding direction of the slider extends radially along the circular contour, so that the traction force output by the slider through the hook component is collinear with the radial repulsion force between adjacent permanent magnets.

5. The assembly device for the multi-segment permanent magnet of the axial flux motor rotor according to claim 4, characterized in that, During the traction assembly process of multi-segment permanent magnets, the elastic force generated by the stretching of the elastic element is greater than the magnetic repulsion force between the permanent magnet to be assembled and the adjacent assembled permanent magnet. The torsional force of the torsion spring acting on the hook component is greater than the reverse disengagement force of the permanent magnet to be assembled on the hook component, so as to maintain the hook engagement state between the hook component and the permanent magnet throughout the traction process.

6. The assembly device for the multi-segment permanent magnet of the axial flux motor rotor according to claim 1, characterized in that, The base includes guide limiting parts arranged opposite to each other, and guide grooves extending along the sliding direction of the slider are respectively opened on the opposite inner surfaces of the two guide limiting parts. The two opposite outer walls of the slider are respectively provided with guide rails adapted to the guide grooves. The guide rails are embedded in the guide grooves on the corresponding sides to form a double-sided symmetrical guide sliding fit.

7. The assembly device for the multi-segment permanent magnet of the axial flux motor rotor according to claim 6, characterized in that, The sliding member has a receiving cavity arranged along its length, and the base is provided with a connecting block extending into the receiving cavity at one end; The elastic element is disposed in the receiving cavity, with one end connected to the end wall of the receiving cavity facing the hook member, and the other end connected to the connecting block, so that the central axis of the elastic element is collinear with the sliding direction of the sliding member.

8. The assembly device for the multi-segment permanent magnet of the axial flux motor rotor according to claim 1, characterized in that, The hook component includes a hinge portion and a hook body portion integrally formed with the hinge portion; The hinge is rotatably connected to the end of the sliding member via a pin; the torsion spring is sleeved on the pin, with one end of the torsion spring abutting against the sliding member and the other end abutting against the hook body. The lower surface of the hook body has a slot structure that matches the outer contour of the permanent magnet.

9. A method for assembling a multi-segment permanent magnet of an axial flux motor rotor, characterized in that, The assembly method is implemented based on the assembly apparatus as described in any one of claims 1-8, and includes the following steps: Step S10: Place the rotor steel disc on the rotor fixing part of the base, so that the rotor steel disc and the tooling installation part are coaxial; align the base of the traction bonding mechanism with the tooling installation part, insert it, and rotate to lock it in place, thus completing the detachable fixing of the traction bonding mechanism on the base. Step S20: Rotate the rotor steel disc to align the first magnet slot to be assembled with the traction direction of the traction bonding mechanism, place the first permanent magnet in the magnet slot, and position it by having one side abut against the circumferential limiting edge of the magnet slot. Step S30: Drive the slider to slide away from the side of the permanent magnet to stretch the elastic element, hook the hook component to the outer wall of the permanent magnet to be assembled, the torsion spring applies a deflection force toward the permanent magnet to the hook component, and releases the elastic element to drive the slider to reset, and pull the permanent magnet to be assembled to move to the adjacent assembled permanent magnet to make the sides fit together. Step S40: Repeat step S30 to sequentially complete the assembly of each subsequent permanent magnet in the same magnetic steel groove until all permanent magnets in the magnetic steel groove are assembled in place. Step S50: Rotate the rotor steel disc to align the next magnet slot to be assembled with the traction direction of the traction bonding mechanism. Repeat steps S20 to S40 until all the multi-segment permanent magnets of all magnet slots on the rotor steel disc are assembled.

10. The assembly method of the multi-segment permanent magnet of the axial flux motor rotor according to claim 9, characterized in that, In step S30, the elastic coefficient of the elastic element is determined by matching according to the following steps: The radial magnetic repulsion force of two adjacent permanent magnets at different circumferential distances was measured in advance to obtain the corresponding relationship between the magnetic repulsion force and the distance, and to determine the maximum radial magnetic repulsion force at the moment when the end faces of the two permanent magnets were in contact. The elastic coefficient of the elastic element is determined by combining the effective traction stroke of the sliding element with the constraint that the elastic force of the elastic element is greater than the maximum radial magnetic repulsion force when the sliding element moves to the final position. Throughout the entire process of moving the permanent magnet to be assembled, the elastic force of the elastic element is always greater than the radial magnetic repulsion between the two permanent magnets at the corresponding distance. As the distance between the permanent magnet to be assembled and the assembled permanent magnet gradually decreases, the elastic force of the elastic element decreases linearly with the decrease of its own stretching, and the value at the end of the stroke of the elastic force is greater than the magnetic repulsion at the moment when the two permanent magnets are in contact.

Images