Rotor assembly and axial flux machine

Abstract

The utility model relates to motor technical field especially rotor assembly and axial flux motor are provided, the rotor assembly in this axial flux motor includes permanent magnet and rotor disc, wherein, the rotor disc has a plurality of accommodation notches, a plurality of accommodation notches are arranged in the circumferential interval around the axis direction, each accommodation notch extends from the axial outer peripheral wall of rotor disc along the radial direction to the inside, each accommodation notch penetrates the rotor disc along the axial direction, each accommodation notch can accommodate a permanent magnet, the isolation tooth is formed between two adjacent accommodation notches around the axis direction, the isolation tooth is provided with the through hole of breaking flow, the through hole of breaking flow is configured as the eddy current loop is blocked, the air gap in the through hole of breaking flow blocks the eddy current loop on the isolation tooth, under the premise of guaranteeing the structural strength of rotor disc, the eddy current loss is greatly reduced, and then the total loss of axial flux motor is greatly reduced, and the working efficiency of axial flux motor is improved.

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. The magnets are clamped and fixed onto the rotor disc.

[0003] During normal operation of an axial flux motor, the high-frequency magnetic field generated by the stator assembly and the magnetic field of the permanent magnets within the rotor assembly generate eddy currents when passing through the rotor disk, resulting in significant eddy current losses on the rotor disk. Especially under high-frequency operating conditions, eddy current losses on the rotor disk account for the majority of the total losses of the axial flux motor. Reducing eddy current losses on the rotor disk is crucial for reducing the overall losses of the axial flux motor and improving its operating efficiency.

[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 reduce eddy current losses of the rotor disk, reduce the total losses of the axial flux motor using the rotor disk, and improve the working efficiency of the axial flux motor using the rotor disk.

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

[0007] Rotor assembly, including:

[0008] permanent magnet;

[0009] The rotor disk has multiple receiving notches, which are arranged circumferentially around the axial direction. Each receiving notch extends radially inward from the outer axial wall of the rotor disk and penetrates the rotor disk along the axial direction. Each receiving notch can accommodate and fix one permanent magnet.

[0010] An isolation tooth is formed between two adjacent receiving notches around the axial direction, and a flow-blocking hole is provided on the isolation tooth, which is configured to block the eddy current loop.

[0011] As an option, each of the isolation teeth is provided with at least two flow-blocking holes, and the at least two flow-blocking holes are arranged at radial intervals.

[0012] As an optional embodiment, the rotor disk has a plurality of receiving notches arranged in a circumferentially spaced circle, the width of the receiving notches extending radially outward from one end near the center while gradually increasing, and the permanent magnet is adapted to the receiving notches;

[0013] In all the interrupted flow holes arranged radially outward from one end near the center within the same isolation tooth, the width of the interrupted flow holes decreases sequentially about the axial direction.

[0014] Alternatively, each of the interrupted flow holes extends radially, and the width of each interrupted flow hole about the axial direction gradually decreases as it extends radially outward from one end near the center.

[0015] As an optional feature, the rotor assembly further includes:

[0016] An axial stop is provided, wherein the permanent magnet extends from both ends of the receiving notch along the axial direction. The axial stop includes two end plates disposed opposite each other, which are respectively disposed on both sides of the rotor disk along the axial direction. Each end plate is provided with multiple clamping notches, which are arranged circumferentially around the axial direction. Each clamping notch extends radially inward from the outer axial wall of the end plate and penetrates the rotor disk along the axial direction. The clamping notch is used to accommodate the portion of the permanent magnet extending out of the receiving notch, and each clamping notch stops and fixes the permanent magnet along the axial direction toward the side closer to the corresponding end plate.

[0017] The two clamping notches facing each other along the axial direction in the two end plates form a set of axial limiting structures. Each set of axial limiting structures fixes the rotor disk and a permanent magnet along the axial stop.

[0018] As an optional solution, the clamping notch has an abutting outer wall that abuts against the permanent magnet, at least a portion of the abutting outer wall has a first mating slope, the end plate has a first end face close to the rotor disk and a second end face away from the rotor disk, and the first mating slope extends from the second end face toward the first end face while tilting inward;

[0019] The axial outer peripheral wall of the permanent magnet includes a central region and edge regions located at both ends of the central region along the axial direction. The edge regions are located at the portion of the permanent magnet that extends out of the receiving notch. At least a portion of the edge regions has a second mating slope. The second mating slope extends along the axial direction from the end of the edge region away from the central region toward the central region while tilting outward. The second mating slope is correspondingly provided with the first mating slope, and the inclination angles of the second mating slope and the first mating slope are the same.

[0020] 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.

[0021] As an optional feature, the rotor assembly further includes:

[0022] A radial limiting ring is sleeved on the axial outer peripheral wall of the rotor disk, and the radial limiting ring is configured to clamp and fix the rotor disk and the permanent magnet along the radial direction.

[0023] Alternatively, the permanent magnet may comprise a plurality of segmented units arranged sequentially along the radial direction, each segmented unit having the same dimension along the radial direction.

[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 notches on the rotor disk, which are arranged circumferentially around the axial direction. Each receiving notch extends radially inward from the outer axial wall of the rotor disk and penetrates the rotor disk axially. Each receiving notch accommodates and fixes a permanent magnet, thus achieving the effect of multiple permanent magnets being arranged circumferentially around the axial direction and fixed on the rotor disk. By forming isolation teeth between two adjacent receiving notches around the axial direction, and opening flow-blocking holes on each isolation tooth, the eddy current loop on the isolation tooth is blocked by the air gap in the flow-blocking hole. Under the premise of ensuring the structural strength of the rotor disk, the eddy current loss of the rotor disk is greatly reduced.

[0027] This invention also provides an axial flux motor. By applying the above-mentioned rotor assembly, the eddy current loss of the rotor disk is significantly reduced while ensuring the structural strength of the rotor disk, thereby significantly reducing the total loss of the axial flux motor and improving the working efficiency of the axial flux motor. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the rotor assembly provided in an embodiment of the present invention;

[0029] Figure 2 This is an exploded view of the rotor assembly provided in this embodiment of the present invention;

[0030] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0031] Figure 4 yes Figure 2 A magnified view of a section at point B.

[0032] In the picture:

[0033] 100. Rotor disc; 110. Receiving notch; 120. Isolation tooth; 121. Flow interruption hole;

[0034] 200. Axial stop; 210. End plate; 211. Clamping notch; 2111. First mating slope

[0035] 300. Radial limiting ring;

[0036] 400. Permanent magnet; 410. Segmented unit; 420. Second mating inclined surface. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0038] 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 or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or 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 according to the specific circumstances.

[0039] In the description of this utility model, unless otherwise expressly 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.

[0040] An axial flux motor comprises a rotor assembly and a stator assembly. The rotor assembly includes a rotor disc and magnets. The magnets are clamped and fixed to the rotor disc. During normal operation, the high-frequency magnetic field generated by the stator assembly and the magnetic field of the permanent magnets within the rotor assembly generate eddy currents when passing through the rotor disc, resulting in significant eddy current losses. Especially under high-frequency operating conditions, the eddy current losses of the rotor disc account for the majority of the total losses of the axial flux motor. Reducing the eddy current losses on the rotor disc is crucial for reducing the overall losses of the axial flux motor and improving its operating efficiency.

[0041] Therefore, this embodiment provides a rotor assembly to reduce eddy current losses on the rotor disk. For example... Figure 1 and Figure 2 As shown, the rotor assembly includes a rotor disk 100 and a plurality of permanent magnets 400. The rotor disk 100 has a plurality of receiving notches 110, which are arranged circumferentially around the axial direction. Each receiving notch 110 extends radially inward from the outer axial wall of the rotor disk 100 and penetrates the rotor disk 100 along the axial direction. Each receiving notch 110 can accommodate and fix one permanent magnet 400. An isolation tooth 120 is formed between two adjacent receiving notches 110 around the axial direction. A flow-blocking hole 121 is provided on the isolation tooth 120, which is configured to block the eddy current loop.

[0042] This rotor assembly, by creating multiple receiving notches 110 on the rotor disk 100, arranges these notches 110 in a circumferentially spaced manner around the axial direction. Each notch 110 extends radially inward from the outer axial wall of the rotor disk 100 and penetrates the rotor disk 100 axially. Each notch 110 accommodates and fixes a permanent magnet 400, achieving the effect of multiple permanent magnets 400 arranged circumferentially spaced and fixed on the rotor disk 100. Furthermore, by forming isolation teeth 120 between two adjacent receiving notches 110 around the axial direction, and creating flow-blocking holes 121 on each isolation tooth 120, the air gap within the flow-blocking holes 121 blocks the eddy current loops on the isolation teeth 120. This significantly reduces eddy current losses on the rotor disk 100 while maintaining the structural strength of the rotor disk 100, thereby significantly reducing the total losses of the axial flux motor using this rotor assembly and improving its operating efficiency.

[0043] Optionally, each isolation tooth 120 is provided with at least two flow-blocking holes 121, which are arranged radially at intervals. By providing at least two radially spaced flow-blocking holes 121 on each isolation tooth 120, the area of ​​the air gap within the isolation tooth 120 can be further increased, thereby further reducing eddy current losses on the rotor disk 100. It should be noted that in this embodiment, each isolation tooth 120 is provided with two flow-blocking holes 121 arranged radially in sequence. In other embodiments, the specific number of flow-blocking holes 121 on each isolation tooth 120 can be adaptively adjusted according to actual needs; this embodiment does not impose a specific limitation.

[0044] In this embodiment, the rotor disk 100 has a center formed by multiple accommodating notches 110 arranged in a circumferentially spaced manner. The width of the accommodating notches 110 around the axial direction gradually increases as it extends radially outward from the end near the center. The permanent magnet 400 is adapted to the accommodating notches 110. In the same isolation tooth 120, among all the flow-blocking holes 121 arranged radially outward from the end near the center, the width of the flow-blocking holes 121 around the axial direction decreases sequentially. By gradually increasing the axial width of the receiving notch 110 as it extends radially outward from the end near the center, while ensuring that the permanent magnet 400 is compatible with the receiving notch 110, the size of the permanent magnet 400 can be maximized, thereby increasing the working power of the rotor assembly. Furthermore, by sequentially arranging all the flow-blocking holes 121 radially outward from the end near the center within the same isolation tooth 120, the axial width of the flow-blocking holes 121 decreases sequentially. This allows for the placement of flow-blocking holes 121 with larger axial widths in the larger portions of the isolation tooth 120 and smaller axial widths in the smaller portions, further increasing the area of ​​the air gap within the isolation tooth 120. It should be noted that in this embodiment, among the two flow-blocking holes 121 arranged radially within the isolation tooth 120, the axial width of the flow-blocking hole 121 near the center is 15 mm, and the axial width of the flow-blocking hole 121 away from the center is 12 mm. In other embodiments, the specific value of the width of the flow-blocking hole 121 around the axial direction can also be adjusted according to actual needs, but this embodiment does not make specific limitations.

[0045] Furthermore, in this embodiment, each receiving notch 110 is a radially extending elongated hole, and the width of each position within the elongated hole remains consistent around the axial direction.

[0046] In other embodiments, the width of each flow-blocking hole 121 around the axial direction can be made to gradually decrease as it extends radially outward from the end closest to the center. That is, the flow-blocking hole 121 has an overall isosceles trapezoidal structure, with the lower base of the isosceles trapezoid close to the center and the upper base far from the center, in order to further increase the area of ​​the air gap inside the isolation tooth 120. This embodiment does not make specific limitations.

[0047] In an optional embodiment, the rotor assembly further includes an axial stop 200, wherein the permanent magnet 400 extends into receiving notches 110 at both ends along the axial direction. The axial stop 200 includes two end plates 210 disposed opposite to each other, which are respectively disposed on both sides of the rotor disk 100 along the axial direction. Each end plate 210 is provided with a plurality of clamping notches 211, which are arranged circumferentially around the axial direction. Each clamping notch 211 extends from the outer axial periphery of the end plate 210. The wall extends radially inward, and each clamping notch 211 penetrates the rotor disk 100 axially. The clamping notch 211 is used to accommodate the portion of the permanent magnet 400 that extends out of the receiving notch 110. Each clamping notch 211 stops and fixes the permanent magnet 400 axially toward the side near the corresponding end plate 210. The two clamping notches 211 that are axially opposite each other in the two end plates 210 form a set of axial limiting structures. Each set of axial limiting structures stops and fixes the rotor disk 100 and a permanent magnet 400 axially. By setting two opposing end plates 210 within the axial stop 200 at both ends of the rotor disk 100 along the axial direction, and providing multiple clamping notches 211 on each end plate 210, the clamping notches 211 are arranged circumferentially around the axial direction. Each clamping notch 211 extends radially inward from the outer axial wall of the end plate 210 and penetrates the rotor disk 100 along the axial direction. Each clamping notch 211 accommodates the portion of the permanent magnet 400 that extends out of the accommodating notch 110 and stops and fixes the permanent magnet 400 along the axial direction towards the side closer to the corresponding end plate 210. The two clamping notches 211 facing each other along the axial direction within the two end plates 210 form a set of axial limiting structures, thereby achieving the axial limiting and fixing of all permanent magnets 400 within the rotor disk 100.

[0048] Specifically, such as Figure 3 and Figure 4 As shown, the clamping notch 211 has an outer wall that abuts against the permanent magnet 400. At least a portion of the outer wall has a first mating slope 2111. The end plate 210 has a first end face near the rotor disk 100 and a second end face away from the rotor disk 100. The first mating slope 2111 extends from the second end face toward the first end face while tilting inward. The axial outer peripheral wall of the permanent magnet 400 includes a central region and edge regions located at both ends of the central region along the axial direction. The edge regions are located in the portion of the permanent magnet 400 that extends out of the receiving notch 110. At least a portion of the edge regions has a second mating slope 420. The second mating slope 420 extends axially from the end of the edge region away from the central region toward the central region while tilting outward. The second mating slope 420 is correspondingly provided with the first mating slope 2111, and the inclination angles of the second mating slope 420 and the first mating slope 2111 are the same.

[0049] By providing a first mating inclined surface 2111 at least part of the clamping notch 211 abutting against the outer wall, the first mating inclined surface 2111 extends from the second end face of the end plate 210 away from the rotor disk 100 toward the first end face of the end plate 210 near the rotor disk 100 while tilting inward, and by providing a second mating inclined surface 420 extending from at least part of the edge region of the receiving notch 110 in the permanent magnet 400, the second mating inclined surface 420 extends from the end of the edge region away from the center region toward the center region while tilting outward, ensuring that the tilt angles of the first mating inclined surface 2111 and the second mating inclined surface 420 are the same, the mating of the first mating inclined surface 2111 and the second mating inclined surface 420 can be used to achieve the stop and fixation of the permanent magnet 400 along the axial direction toward the side near the corresponding end plate 210.

[0050] It should be noted that, in this embodiment, the abutting outer wall of the clamping notch 211 includes the groove bottom and groove sidewalls located on both sides of the groove bottom, and the two groove sidewalls are provided with a first mating inclined surface 2111. The two outer sidewalls extending radially in the edge region of the permanent magnet 400 are provided with a second mating inclined surface 420 to ensure the mating fit between the first mating inclined surface 2111 and the second mating inclined surface 420. In other embodiments, the specific positions of the first mating inclined surface 2111 and the second mating inclined surface 420 can also be adjusted according to actual needs; this embodiment does not impose specific limitations.

[0051] As an optional solution, the axial stop 200 is manufactured using injection molding, with the assembled permanent magnet 400 and rotor disk 100 serving as the core for the injection molding of the axial stop 200. By using injection molding to manufacture the axial stop 200, and using the assembled permanent magnet 400 and rotor disk 100 as the core, not only can the production efficiency and precision of the axial stop 200 be improved, but the assembly stability of the axial stop 200 with the rotor disk 100 and permanent magnet 400 can also be guaranteed. Furthermore, since the isolation teeth 120 of the rotor disk 100 are provided with flow-blocking holes 121, the presence of the flow-blocking holes 121 can also increase the flow rate of the injection molding liquid on both sides of the rotor disk 100 during the injection molding process of the axial stop 200, thereby improving the injection molding effect of the axial stop 200.

[0052] It should be noted that 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. Furthermore, the axial stop 200 is made of non-magnetic and non-conductive polytetrafluoroethylene (PTFE). In other embodiments, the axial stop 200 may also be made of other non-magnetic and non-conductive materials; this embodiment does not impose specific limitations.

[0053] In an alternative embodiment, such as Figure 1 and Figure 2 As shown, the rotor assembly also includes a radial limiting ring 300, which is sleeved on the axial outer peripheral wall of the rotor disk 100. The radial limiting ring 300 is configured to radially clamp and fix the rotor disk 100 and the permanent magnet 400. By sleeved on the axial outer peripheral wall of the rotor disk 100, the permanent magnet 400 is radially clamped and fixed to the rotor disk 100, ensuring the structural strength of the rotor assembly.

[0054] In this embodiment, the radial limiting ring 300 is made of carbon fiber material, and the radial limiting ring 300 is wound sequentially around the axial outer peripheral wall of the rotor disk 100 in a winding manner. Carbon fiber material has the advantages of high strength and low mass, which can reduce the overall mass 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.

[0055] As an optional embodiment, the permanent magnet 400 includes multiple radially arranged segmented units 410, each segmented unit 410 having the same radial dimension. By dividing the permanent magnet 400 into multiple radially arranged segmented units 410, ensuring that each segmented unit 410 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 400 includes 19 radially arranged segmented units 410, each segmented unit 410 having a radial dimension of 10 mm. In other embodiments, the specific number of segmented units 410 within each permanent magnet 400 and the radial dimension of the segmented units 410 can be adjusted according to actual needs; this embodiment does not impose specific limitations.

[0056] This embodiment also provides an axial flux motor. The axial flux motor includes a stator assembly and the aforementioned rotor assembly, which are axially opposite to the stator assembly. The rotor assembly is rotatable relative to the stator assembly about the axial direction. By using the aforementioned rotor assembly, this axial flux motor significantly reduces the eddy current losses of the rotor disk 100 while ensuring the structural strength of the rotor disk 100, thereby significantly reducing the total losses of the axial flux motor and improving its operating efficiency.

[0057] 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.

[0058] 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 other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations 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: Permanent magnet (400); The rotor disk (100) has a plurality of receiving notches (110) arranged circumferentially around the axial direction. Each receiving notch (110) extends radially inward from the outer axial wall of the rotor disk (100) and penetrates the rotor disk (100) along the axial direction. Each receiving notch (110) can accommodate and fix one permanent magnet (400). An isolation tooth (120) is formed between two adjacent receiving notches (110) around the axial direction, and a flow-blocking hole (121) is provided on the isolation tooth (120), which is configured to block the eddy current loop.

2. The rotor assembly according to claim 1, characterized in that, Each of the isolation teeth (120) is provided with at least two flow-blocking holes (121), and the at least two flow-blocking holes (121) are arranged at radial intervals.

3. The rotor assembly according to claim 2, characterized in that, The rotor disk (100) has a center formed by a plurality of accommodating notches (110) arranged in a circumferentially spaced manner. The width of the accommodating notches (110) extends radially outward from one end near the center while gradually increasing in width around the axial direction. The permanent magnet (400) is adapted to the accommodating notches (110). In the same isolation tooth (120), all the interruption holes (121) are arranged in a radial direction from the end closest to the center, and the width of the interruption holes (121) decreases in a radial direction.

4. The rotor assembly according to claim 3, characterized in that, Each of the said interrupted flow holes (121) extends along the radial direction, and the width of each of the said interrupted flow holes (121) about the axial direction gradually decreases as it extends radially outward from one end near the center.

5. The rotor assembly according to any one of claims 1-4, characterized in that, The rotor assembly also includes: An axial stop (200) is provided, wherein the permanent magnet (400) extends from both ends of the receiving notch (110) along the axial direction. The axial stop (200) includes two end plates (210) arranged opposite to each other. The two end plates (210) are respectively disposed on both sides of the rotor disk (100) along the axial direction. Each end plate (210) is provided with a plurality of clamping notches (211). The plurality of clamping notches (211) are arranged circumferentially around the axial direction. Each clamping notch (211) extends radially inward from the outer axial peripheral wall of the end plate (210). Each clamping notch (211) penetrates the rotor disk (100) along the axial direction. The clamping notch (211) is used to accommodate the portion of the permanent magnet (400) extending out of the receiving notch (110). Each clamping notch (211) stops and fixes the permanent magnet (400) along the axial direction toward the side closer to the corresponding end plate (210). The two clamping notches (211) facing each other along the axial direction in the two end plates (210) form a set of axial limiting structures. Each set of axial limiting structures fixes the rotor disk (100) and a permanent magnet (400) along the axial stop.

6. The rotor assembly according to claim 5, characterized in that, The clamping notch (211) has an abutting outer wall that abuts against the permanent magnet (400), at least a portion of the abutting outer wall has a first mating slope (2111), the end plate (210) has a first end face close to the rotor disk (100) and a second end face away from the rotor disk (100), the first mating slope (2111) extends from the second end face toward the first end face while tilting inward; The axial outer peripheral wall of the permanent magnet (400) includes a central region and edge regions located at both ends of the central region along the axial direction. The edge regions are located at the portion of the permanent magnet (400) that extends out of the receiving notch (110). At least a portion of the edge regions has a second mating slope (420). The second mating slope (420) extends along the axial direction from the end of the edge region away from the central region toward the central region while tilting outward. The second mating slope (420) is correspondingly provided with the first mating slope (2111), and the second mating slope (420) and the first mating slope (2111) have the same tilt angle.

7. The rotor assembly according to claim 5, characterized in that, The axial stop (200) is manufactured by injection molding. The permanent magnet (400) and the rotor disk (100) assembled together serve as the core for the injection molding of the axial stop (200).

8. The rotor assembly according to any one of claims 1-4, characterized in that, The rotor assembly also includes: A radial limiting ring (300) is sleeved on the axial outer peripheral wall of the rotor disk (100), and the radial limiting ring (300) is configured to clamp and fix the rotor disk (100) and the permanent magnet (400) along the radial direction.

9. The rotor assembly according to any one of claims 1-4, characterized in that, The permanent magnet (400) includes a plurality of segmented units (410) arranged sequentially along the radial direction, each of the segmented units (410) having the same dimension along the radial direction.

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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