Rotor assembly and axial flux machine

Abstract

This utility model relates to the field of motor technology, and more particularly to a rotor assembly and an axial flux motor. The rotor assembly of the axial flux motor includes a rotor disk, multiple permanent magnets, and a radial stop. The rotor disk has multiple receiving through holes arranged circumferentially around the axial direction. Each permanent magnet is installed in one receiving through hole. The radial stop is sleeved on the axial outer periphery of the rotor disk and has a radial stopping structure. The radial stopping structure and the inner wall of the receiving through holes together stop the radial outer wall of the permanent magnets, thereby improving the radial constraint on the permanent magnets and enhancing the structural strength of the rotor disk.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to rotor assembly and axial flux motor. Background Technology

[0002] Axial flux motors, also known as disc motors, are widely used in the market due to their compact structure, small size, light weight, and high torque density. An axial flux motor consists of a rotor assembly and a stator assembly; the rotor assembly includes a rotor disc and magnets.

[0003] In existing technologies, carbon fiber is used to fix the rotor disk and magnets together. However, under high-speed operation of the rotor assembly, the magnets are prone to flying out of the rotor assembly due to centrifugal force. Moreover, as the radius of the rotor assembly increases, the centrifugal force on the magnets increases exponentially, further damaging the rotor assembly. The method of fixing the magnets to the rotor disk by wrapping carbon fiber provides insufficient radial constraint on the magnets. At high speeds, the magnets are stretched by centrifugal force, leading to their own destruction and affecting the service life of the axial flux motor.

[0004] Therefore, there is an urgent need to invent a rotor assembly and an axial flux motor to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a rotor assembly and an axial flux motor to improve the radial constraint on the permanent magnet while increasing the structural strength of the rotor disk.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Rotor assembly, including:

[0008] The rotor disk has multiple receiving through holes, which are arranged circumferentially around the axial direction.

[0009] Multiple permanent magnets, each of which is installed in one of the receiving through holes;

[0010] A radial stop is sleeved on the axial outer periphery of the rotor disk. The radial stop has a radial stop structure, which together with the inner wall of the receiving through hole radially stops the radial outer wall of the permanent magnet.

[0011] As an optional solution, the radial stop member has a sleeve through hole extending along the axial direction, and the inner wall of the sleeve through hole is provided with an annular relief groove. The annular relief groove is used to accommodate the part of the rotor disk located on the outside of the permanent magnet along the radial direction. The bottom of the annular relief groove abuts and is fixed to the outer axial peripheral wall of the rotor disk.

[0012] The thickness of the rotor disk along the axial direction is less than the thickness of the permanent magnet along the axial direction. The inner wall of the sleeved through hole abuts and is fixed to the radial outer wall of the permanent magnet extending out of the accommodating through hole along the axial direction. The inner wall of the sleeved through hole and the annular relief groove together form the radial stop structure.

[0013] As an optional feature, the rotor assembly further includes:

[0014] An axial stop is installed on both sides of the rotor disk. The axial stop has multiple sets of axial stop structures, and each set of axial stop structures is corresponding to one of the permanent magnets. The axial stop structure can fix the corresponding permanent magnet to the rotor disk along the axial stop.

[0015] As an optional solution, the axial stop member has two axial stop plates arranged opposite to each other. The two axial stop plates are respectively installed on both sides of the rotor disk along the axial direction. Each axial stop plate has a plurality of wedge-shaped grooves arranged circumferentially around the axial direction. Each wedge-shaped groove passes through the corresponding axial stop plate along the axial direction.

[0016] The thickness of the rotor disk along the axial direction is less than the thickness of the permanent magnet along the axial direction. The wedge-shaped groove is used to accommodate the portion of the permanent magnet that extends out of the receiving through hole along the axial direction. The two wedge-shaped grooves arranged opposite each other along the axial direction in the two axial stop plates form a set of axial stop structures. The axial stop plates have a first end face close to the rotor disk along the axial direction and a second end face away from the rotor disk. At least a portion of the groove wall of the wedge-shaped groove extends from the first end face toward the second end face while tilting outward along the radial direction. The groove wall of the wedge-shaped groove is configured to abut and fix against the radial inner wall and two radial side walls of the permanent magnet along the axial direction away from the rotor disk.

[0017] As an optional embodiment, the radial sidewall and / or the radial inner wall of the permanent magnet includes a central portion and an edge portion. The edge portion is provided at both ends of the central portion along the axial direction. The central portion is directly opposite to the inner wall of the cavity that accommodates the through hole. The edge portion has a mating slope. The mating slope extends axially away from the central portion from one end near the central portion while tilting inward along the radial direction.

[0018] The wedge-shaped groove has a first groove wall and a second groove wall. The first groove wall extends from the first end face toward the second end face and is inclined outward along the radial direction. The second groove wall extends only along the axial direction. The first groove wall is provided in correspondence with the mating inclined surface, and the inclination angle of the first groove wall is the same as the inclination angle of the mating inclined surface.

[0019] As an optional solution, the axial stop is manufactured by injection molding, and the permanent magnet and the rotor disk assembled together serve as the core for the injection molding of the axial stop.

[0020] As an optional solution, the rotor disk has at least one injection molding through hole, which extends through the rotor disk along the axial direction.

[0021] Alternatively, each of the permanent magnets may include a plurality of segmented units arranged sequentially along the radial direction, and each of the segmented units shall have the same dimension along the radial direction.

[0022] As an optional feature, the rotor assembly further includes:

[0023] An adapter shaft is fixedly connected to the rotor disk, the adapter shaft extends along the axial direction, the rotation center of the adapter shaft coincides with the rotation center of the rotor disk, and the adapter shaft is configured to dock with external equipment.

[0024] An axial flux motor includes a stator assembly and a rotor assembly as described above, the rotor assembly being disposed opposite to the stator assembly along the axial direction, the rotor assembly being rotatable relative to the stator assembly about the axial direction.

[0025] The beneficial effects of this utility model are:

[0026] The rotor assembly provided by this utility model has multiple receiving through holes on the rotor disk, arranged circumferentially around the axial direction. A permanent magnet is installed in each receiving through hole, which can achieve initial fixation of the permanent magnet to the rotor disk. By sleeved a radial stop on the outer axial circumference of the rotor disk, the radial stop structure inside the radial stop and the inner wall of the receiving through hole together radially stop the outer wall of the permanent magnet. This not only enables the radial stop and the rotor disk to jointly bear the centrifugal force of the permanent magnet in the radial direction, improving the radial stopping and fixing effect of the permanent magnet, but also improves the structural strength of the rotor disk, enhances the protection of the rotor disk, improves the structural stability of the rotor assembly, and thus improves the service life of the rotor assembly.

[0027] This invention also provides an axial flux motor. By applying the above-mentioned rotor assembly, the radial constraint on the permanent magnet is improved, the radial structural strength of the rotor disk is increased, the structural stability of the rotor assembly is improved, and thus the service life of the axial flux motor is improved. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a portion of the rotor assembly provided in an embodiment of this utility model;

[0029] Figure 2This is a schematic diagram of the structure of a portion of the rotor disks provided in an embodiment of this utility model;

[0030] Figure 3 This is a schematic diagram of the structure of some radial stop components provided in the embodiments of this utility model;

[0031] Figure 4 This is a schematic diagram of the structure of some axial stop components provided in the embodiments of this utility model;

[0032] Figure 5 This is a schematic diagram of the structure of the permanent magnet provided in this embodiment of the utility model.

[0033] In the picture:

[0034] 100. Rotor disc; 110. Receiving through hole; 120. Injection molding through hole; 130. Through hole;

[0035] 200. Permanent magnet; 210. Segmented unit; 211. Fitting inclined surface;

[0036] 300. Radial stop; 310. Annular clearance groove;

[0037] 400. Axial stop; 410. Axial stop plate; 411. Wedge groove

[0038] 500, Adapter shaft; 510, Annular boss;

[0039] 600. Fasteners. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 utility model based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0044] Axial flux motors consist of a rotor assembly and a stator assembly. The rotor assembly includes a rotor disc and magnets. In existing technology, carbon fiber is wound around the rotor disc to fix the magnets together. However, under high-speed operation of the rotor assembly, the magnets are prone to flying out of the rotor assembly due to centrifugal force. Moreover, as the radius of the rotor assembly increases, the centrifugal force on the magnets increases exponentially, further increasing the risk of damage to the rotor assembly. The method of fixing the magnets to the rotor disc by winding carbon fiber provides insufficient radial constraint on the magnets. At high speeds, the magnets are stretched by centrifugal force, leading to their own destruction and affecting the service life of the axial flux motor.

[0045] To solve the above problems, such as Figure 1 and Figure 2 As shown, this embodiment provides a rotor assembly. The assembly includes a rotor disk 100, a permanent magnet 200, a radial stop 300, and an axial stop 400. The rotor disk 100 has multiple receiving through holes 110, which are arranged circumferentially around the axial direction. Each permanent magnet 200 is installed in one receiving through hole 110. The radial stop 300 is sleeved on the axial outer periphery of the rotor disk 100 and has a radial stop structure. The radial stop structure and the inner wall of the receiving through hole 110 together radially stop the radial outer wall of the permanent magnet 200.

[0046] The rotor assembly features multiple receiving through holes 110 on the rotor disk 100, arranged circumferentially around the axial direction. A permanent magnet 200 is installed within each receiving through hole 110, achieving initial fixation between the permanent magnet 200 and the rotor disk 100. Furthermore, a radial stop 300 is fitted around the outer axial periphery of the rotor disk 100. This radial stop structure within the radial stop 300, together with the inner wall of the receiving through hole 110, radially stops the outer radial wall of the permanent magnet 200. This not only allows the radial stop 300 and the rotor disk 100 to jointly bear the centrifugal force of the permanent magnet 200 radially, improving the radial stopping and fixing effect on the permanent magnet 200, but also enhances the structural strength and protection of the rotor disk 100 by utilizing the stopping and fixing effect between the radial stop 300 and the outer circumferential wall of the rotor disk 100, thereby improving the structural stability of the rotor assembly and ultimately extending its service life.

[0047] It should be noted that, Figure 1 Only one-sixth of the rotor assembly is shown; the rotor assembly consists of six parts. Figure 1 The rotor assembly shown is a disc-shaped structure composed of the components. Furthermore, the rotor assembly of this embodiment includes 12 permanent magnets 200, and 12 receiving through holes 110 are equally spaced around the rotor disk 100 in a circular pattern around the axial direction.

[0048] Combination Figure 3 The specific structure of the radial stop 300 is described below. The radial stop 300 has an axially extending through hole. The inner wall of the through hole is provided with an annular relief groove 310. The annular relief groove 310 is used to accommodate the part of the rotor disk 100 located radially outside the permanent magnet 200. The bottom of the annular relief groove 310 abuts and is fixed to the axial outer peripheral wall of the rotor disk 100. The axial thickness of the rotor disk 100 is less than the axial thickness of the permanent magnet 200. The inner wall of the radial stop 300 abuts and is fixed to the radial outer wall of the permanent magnet 200 extending axially to accommodate the through hole 110. The inner wall of the through hole and the annular relief groove 310 together form a radial stop structure.

[0049] The radial stop 300 has an axially extending through hole and an annular clearance groove 310 on the inner wall of the through hole. The portion of the rotor disk 100 located radially outside the permanent magnet 200 is accommodated in the annular clearance groove 310. The inner wall of the through hole and the annular clearance groove 310 together form a radial stop structure. Combined with the characteristic that the thickness of the rotor disk 100 along the axial direction is less than the thickness of the permanent magnet 200 along the radial direction, the inner wall of the through hole abuts and is fixed to the radial outer wall of the permanent magnet 200 extending axially to accommodate the through hole 110. The bottom of the annular groove 310 abuts and is fixed to the axial outer peripheral wall of the rotor disk 100. This achieves the effect that the radial stop structure abuts and is fixed radially outward to both the axial outer peripheral wall of the rotor disk 100 and the entire radial outer wall of the permanent magnet 200.

[0050] It should be noted that in this embodiment, the annular clearance groove 310 is located in the central region along the axial direction of the inner wall of the sleeved through hole, and the two ends of the permanent magnet 200 along the axial direction extend out of the receiving through hole 110 of the rotor disk 100, so that the two ends of the inner wall of the sleeved through hole along the axial direction abut against the radial outer wall of the portion of the permanent magnet 200 extending out of the receiving through hole 110 along the axial direction, thereby further improving the radial stopping effect on the permanent magnet 200.

[0051] Furthermore, to further avoid stress concentration between the rotor disk 100 and the radial stop 300, fillets are provided between the axial outer peripheral wall and the axial end faces of the rotor disk 100, with a fillet radius greater than 0.5 mm. Similarly, matching fillets are provided between the bottom of the annular groove 310 and its two side walls. In this embodiment, the fillet radius is 1 mm. In other embodiments, the fillet radius can be adjusted arbitrarily within a range greater than 0.5 mm according to actual needs; this embodiment does not impose specific limitations.

[0052] Optionally, the radial stop 300 is made of carbon fiber material, and is fixed to the rotor disk 100 and permanent magnet 200 by winding. Carbon fiber material has the advantages of high strength and low weight, which can reduce the overall weight of the rotor assembly while meeting actual strength requirements. The specific operation steps of carbon fiber winding are prior art and will not be described in detail here.

[0053] In an alternative embodiment, the rotor assembly further includes axial stop members 400, which are simultaneously installed on both axial sides of the rotor disk 100. The axial stop members 400 have multiple sets of axial stop structures, each set corresponding to a permanent magnet 200. The axial stop structures can fix the corresponding permanent magnet 200 to the rotor disk 100 along the axial stop. By simultaneously installing the axial stop members 400 on both axial sides of the rotor disk 100, and providing multiple sets of axial stop structures within the axial stop members 400, with each set corresponding to a permanent magnet 200 and fixing the permanent magnet 200 to the rotor disk 100 along the axial stop, the axial constraint on the permanent magnet 200 and the rotor disk 100 is strengthened, further improving the structural stability of the rotor assembly.

[0054] like Figure 1 and Figure 4 As shown, the axial stop 400 has two axial stop plates 410 arranged opposite to each other. The two axial stop plates 410 are respectively installed on both sides of the rotor disk 100 along the axial direction. Each axial stop plate 410 has a plurality of wedge-shaped grooves 411 arranged circumferentially around the axial direction. Each wedge-shaped groove 411 passes through the corresponding axial stop plate 410 along the axial direction. The wedge-shaped grooves 411 are used to accommodate the portion of the permanent magnet 200 that extends out of the receiving through hole 110 along the axial direction. The two wedge-shaped grooves 411 arranged opposite to each other along the axial direction in the two axial stop plates 410 form a set of axial stop structures. The axial stop plate 410 has a first end face close to the rotor disk 100 along the axial direction and a second end face away from the rotor disk 100. At least part of the groove wall of the wedge-shaped groove 411 extends from the first end face to the second end face while tilting outward in the radial direction. The groove wall of the wedge-shaped groove 411 is configured to abut and fix against the radial inner wall and two radial side walls of the permanent magnet 200 in the direction away from the rotor disk 100 along the axial direction.

[0055] By providing two opposing axial stop plates 410 within the axial stop member 400, the two axial stop plates 410 are respectively installed on both sides of the rotor disk 100 along the axial direction. Multiple wedge-shaped grooves 411 are formed on each axial stop plate 410, arranged circumferentially around the axial direction. The wedge-shaped grooves 411 penetrate the axial stop plate 410 radially, and at least a portion of the groove wall of the wedge-shaped groove 411 extends from the first end face of the axial stop plate 410 away from the rotor disk 100 toward the second end face closer to the rotor disk 100. When the wedge groove 411 is tilted outward along the axial direction, the size of the wedge groove 411 gradually increases as it extends axially from the end away from the rotor disk 100 toward the end closer to the rotor disk 100. The two wedge grooves 411 arranged opposite each other along the axial direction in the two axial stop plates 410 are used as a set of axial stop structures. When the two axial ends of the permanent magnet 200 are respectively accommodated in the two wedge grooves 411 in the set of axial stop structures, the two wedge grooves 411 cooperate with each other to prevent the permanent magnet 200 from moving axially relative to the rotor disk 100.

[0056] To further improve the axial positioning effect of the permanent magnet 200, such as Figure 5 As shown, the radial sidewall of the permanent magnet 200 includes a central portion and an edge portion. The central portion has edge portions at both ends along the axial direction. The central portion is directly opposite the inner cavity wall of the through hole 110. The edge portion has a mating inclined surface 211. The mating inclined surface 211 extends axially away from the central portion from one end near the central portion while tilting radially inward. The groove wall of the wedge groove 411 is divided into a first groove wall and a second groove wall. The first groove wall extends radially outward from the first end face towards the second end face. The second groove wall extends only along the axial direction. The first groove wall and the mating inclined surface 211 are correspondingly arranged. The tilt angle of the first groove wall is the same as the tilt angle of the mating inclined surface 211. By dividing the radial sidewall of the permanent magnet 200 into a central portion and an edge portion, with the edge portion located at both ends of the central portion along the axial direction and the central portion directly facing the inner wall of the receiving through hole 110, and providing a mating inclined surface 211 on the edge portion, the mating inclined surface 211 extends from the end near the central portion toward the direction away from the central portion while tilting radially inward. Combined with dividing the wedge groove 411 into a first groove wall extending from the first end face toward the second end face while tilting radially outward and a second groove wall extending only along the axial direction, the first groove wall is correspondingly set with the mating inclined surface 211, and the tilt angle of the first groove wall is the same as the tilt angle of the mating inclined surface 211. When the part of the permanent magnet 200 extending out of the receiving through hole 110 is located in the wedge groove 411, the mating inclined surface 211 abuts against the first groove wall, increasing the contact area between the permanent magnet 200 and the wedge groove 411, thereby improving the axial positioning effect of the permanent magnet 200.

[0057] It should be noted that in other embodiments, a central portion and an edge portion may also be provided on the radial inner wall of the permanent magnet 200, so that a portion of the radial inner wall of the permanent magnet 200 abuts against the first groove wall of the wedge-shaped groove 411. Alternatively, a central portion and an edge portion may be provided on both the radial sidewall and the inner wall of the permanent magnet 200 to further improve the axial positioning effect of the permanent magnet 200.

[0058] As an optional solution, the axial stop 400 is manufactured using injection molding, with the assembled permanent magnet 200 and rotor disk 100 serving as the core for the injection molding of the axial stop 400. By using injection molding to manufacture the axial stop 400, and using the assembled permanent magnet 200 and rotor disk 100 as the core for the injection molding of the axial stop 400, not only can the rapid production of the axial stop 400 be achieved, but the assembly effect of the axial stop 400 with the permanent magnet 200 and rotor disk 100 can also be guaranteed, thereby ensuring the structural stability of the rotor assembly. The specific operation procedures of injection molding are existing technology and will not be described in detail here.

[0059] To improve the injection molding effect of the axial stop 400, such as Figure 2 As shown, the rotor disk 100 has at least one injection through hole 120, which extends axially through the rotor disk 100. By opening at least one injection through hole 120 extending axially through the rotor disk 100, the flow rate of the injection molding liquid on both sides of the rotor disk 100 can be increased during the injection molding process of the axial stop 400, thereby improving the injection molding effect of the axial stop 400.

[0060] It should be noted that in this embodiment, since the rotor assembly includes 12 permanent magnets 200, the rotor disk 100 has 12 accommodating through holes 110 arranged circumferentially and at equal intervals around the axial direction. A spoke is formed between two adjacent accommodating through holes 110, and the rotor disk 100 has a total of 12 spokes. Each spoke has three injection molding through holes 120 spaced radially, and the rotor disk 100 has a total of 36 injection molding through holes 120. In other embodiments, the specific number and location of the injection molding through holes 120 in the rotor disk 100 can be adjusted according to actual needs; this embodiment does not impose specific limitations.

[0061] Furthermore, in this embodiment, the rotor disk 100 is made of martensitic precipitation-hardening stainless steel to give it low electrical conductivity and reduce turbine losses. The axial stop 400 is made of non-magnetic and non-conductive polytetrafluoroethylene (PTFE). In other embodiments, the axial stop 400 may also be made of other non-magnetic and non-conductive materials; this embodiment does not impose specific limitations.

[0062] In one alternative embodiment, each permanent magnet 200 includes multiple radially arranged segmented units 210, each segmented unit 210 having the same radial dimension. By dividing each permanent magnet 200 into multiple radially arranged segmented units 210, ensuring that each segmented unit 210 has the same radial dimension, the circumferential eddy current path can be effectively blocked, reducing eddy current losses. It should be noted that in this embodiment, each permanent magnet 200 includes 11 radially arranged segmented units 210, each segmented unit 210 having a radial dimension of 10 mm. In other embodiments, the specific number of segmented units 210 within each permanent magnet 200 and the radial dimension of the segmented units 210 can be adjusted according to actual needs; this embodiment does not impose specific limitations.

[0063] In an alternative embodiment, such as Figure 1As shown, the rotor assembly also includes a transfer shaft 500, which is fixedly connected to the rotor disk 100. The transfer shaft 500 extends axially, and its rotation center coincides with the rotation center of the rotor disk 100. The transfer shaft 500 is configured to interface with external equipment. By additionally providing an axially extending transfer shaft 500 within the rotor assembly, fixing the transfer shaft 500 to the rotor disk 100, aligning the rotation center of the transfer shaft 500 with the rotation center of the rotor disk 100, and interfaced with external equipment via the transfer shaft 500, the output power of the rotor assembly can be transmitted to the external equipment, thus realizing the drive function of the rotor assembly.

[0064] Optionally, such as Figure 1 and Figure 2 As shown, the rotor assembly also includes a fixing member 600. An annular boss 510 is provided on the axial outer peripheral wall of the adapter shaft 500, and the annular boss 510 has an axially extending fixing hole. The rotor disk 100 has an axially extending through hole 130. The fixing member 600 passes through the through hole 130 and is detachably fixed to the fixing hole. By providing an annular boss 510 on the axial outer peripheral wall of the adapter shaft 500, providing an axially extending fixing hole within the annular boss 510, and providing an axially extending through hole 130 in the rotor disk 100, the fixing member 600 passes through the through hole 130 and is detachably fixed to the fixing hole, thus achieving detachable fixing between the rotor disk 100 and the adapter shaft 500. It should be noted that in this embodiment, the fixing member 600 is a bolt. Both the inner walls of the through hole 130 and the fixing hole are provided with internal threads, and the bolt shank is threaded into both the through hole 130 and the fixing hole.

[0065] To further improve the fixing effect between the adapter shaft 500 and the rotor disk 100, the rotor assembly includes six fixing members 600. The annular boss 510 of the adapter shaft 500 has six fixing holes spaced circumferentially around the axial direction. The rotor disk 100 has six through holes 130 correspondingly arranged circumferentially around the axial direction. Each fixing member 600 corresponds to one through hole 130 and one fixing hole. In other embodiments, the number of fixing members 600, fixing holes, and through holes 130 can be adjusted according to actual needs, as long as each fixing member 600 corresponds to one through hole 130 and one fixing hole. This embodiment does not impose specific limitations.

[0066] This embodiment also provides an axial flux motor. The axial flux motor includes a stator assembly and a rotor assembly provided in this embodiment. The stator assembly and the rotor assembly are arranged opposite each other along the axial direction, and the rotor assembly is rotatable relative to the stator assembly about the axial direction. By using the aforementioned rotor assembly, this axial flux motor improves the radial constraint on the permanent magnet 200, enhances the radial structural strength of the rotor disk 100, improves the structural stability of the rotor assembly, and thus increases the service life of the axial flux motor.

[0067] Optionally, the axial flux motor also includes a housing with a storage cavity in which the rotor assembly is rotatably mounted and the stator assembly is fixed within the storage cavity to improve protection for the rotor assembly and the stator assembly.

[0068] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A rotor assembly, characterized in that, include: The rotor disk (100) has a plurality of receiving through holes (110) which are arranged circumferentially around the axial direction. Multiple permanent magnets (200), each of the permanent magnets (200) is installed in one of the receiving through holes (110); A radial stop (300) is sleeved on the axial outer periphery of the rotor disk (100). The radial stop (300) has a radial stop structure. The radial stop structure and the inner wall of the receiving through hole (110) together radially stop the radial outer wall of the permanent magnet (200).

2. The rotor assembly according to claim 1, characterized in that, The radial stop (300) has an axially extending through hole, and the inner wall of the through hole is provided with an annular relief groove (310). The annular relief groove (310) is used to accommodate the part of the rotor disk (100) located on the outside of the permanent magnet (200) along the radial direction. The bottom of the annular relief groove (310) abuts and is fixed to the outer axial peripheral wall of the rotor disk (100). The thickness of the rotor disk (100) along the axial direction is less than the thickness of the permanent magnet (200) along the axial direction. The inner wall of the sleeved through hole abuts and is fixed to the radial outer wall of the portion of the permanent magnet (200) extending out of the receiving through hole (110) along the axial direction. The inner wall of the sleeved through hole and the annular relief groove (310) together form the radial stop structure.

3. The rotor assembly according to claim 1 or claim 2, characterized in that, The rotor assembly also includes: An axial stop (400) is installed on both sides of the rotor disk (100). The axial stop (400) has multiple sets of axial stop structures. Each set of axial stop structures is correspondingly set with one permanent magnet (200). The axial stop structure can fix the corresponding permanent magnet (200) and the rotor disk (100) along the axial stop.

4. The rotor assembly according to claim 3, characterized in that, The axial stop (400) has two axial stop plates (410) arranged opposite to each other. The two axial stop plates (410) are respectively installed on both sides of the rotor disk (100) along the axial direction. Each axial stop plate (410) has a plurality of wedge-shaped grooves (411) arranged circumferentially around the axial direction. Each wedge-shaped groove (411) passes through the corresponding axial stop plate (410) along the axial direction. The thickness of the rotor disk (100) along the axial direction is less than the thickness of the permanent magnet (200) along the axial direction. The wedge groove (411) is used to accommodate the portion of the permanent magnet (200) extending out of the receiving through hole (110) along the axial direction. The two wedge grooves (411) arranged opposite each other along the axial direction in the two axial stop plates (410) form a set of axial stop structures. The axial stop plate (410) has a first end face close to the rotor disk (100) along the axial direction and a second end face away from the rotor disk (100). At least part of the groove wall of the wedge groove (411) extends from the first end face toward the second end face while tilting outward along the radial direction. The groove wall of the wedge groove (411) is configured to abut and fix with the radial inner wall and two radial side walls of the permanent magnet (200) along the axial direction away from the rotor disk (100).

5. The rotor assembly according to claim 4, characterized in that, The radial sidewall and / or the radial inner wall of the permanent magnet (200) include a central portion and an edge portion. The edge portion is provided at both ends of the central portion along the axial direction. The central portion is directly opposite to the inner wall of the receiving through hole (110). The edge portion has a mating inclined surface (211). The mating inclined surface (211) extends axially away from the central portion from one end near the central portion while tilting inward along the radial direction. The groove wall of the wedge groove (411) is divided into a first groove wall and a second groove wall. The first groove wall extends from the first end face toward the second end face while tilting outward along the radial direction. The second groove wall extends only along the axial direction. The first groove wall is correspondingly provided with the mating inclined surface (211). The tilt angle of the first groove wall is the same as the tilt angle of the mating inclined surface (211).

6. The rotor assembly according to claim 3, characterized in that, The axial stop (400) is manufactured by injection molding. The permanent magnet (200) and the rotor disk (100) assembled together serve as the core for the injection molding of the axial stop (400).

7. The rotor assembly according to claim 6, characterized in that, The rotor disk (100) has at least one injection molding through hole (120), which penetrates the rotor disk (100) along the axial direction.

8. The rotor assembly according to claim 1 or claim 2, characterized in that, Each of the permanent magnets (200) includes a plurality of segmented units (210) arranged sequentially along the radial direction, and each of the segmented units (210) has the same dimension along the radial direction.

9. The rotor assembly according to claim 1 or claim 2, characterized in that, The rotor assembly also includes: A transfer shaft (500) is fixedly connected to the rotor disk (100), the transfer shaft (500) extends along the axial direction, the rotation center of the transfer shaft (500) coincides with the rotation center of the rotor disk (100), and the transfer shaft (500) is configured to dock with external equipment.

10. An axial flux motor, characterized in that, It includes a stator assembly and a rotor assembly as claimed in any one of claims 1 to 9, wherein the rotor assembly is disposed opposite to the stator assembly along the axial direction, and the rotor assembly is rotatable relative to the stator assembly about the axial direction.

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