Axial field motor rotor structure

Abstract

The application relates to an axial magnetic field motor, in particular to a rotor structure of an axial magnetic field motor, which comprises a rotor core, a plurality of permanent magnets and at least one magnetic conducting assembly, the plurality of permanent magnets are arranged in a circle and are spaced, the inner surface of the permanent magnets in the axial direction is arranged on the rotor core, and the magnetic conducting assembly covers the outer surface of the permanent magnets in the axial direction and the two side surfaces of the permanent magnets in the circumferential direction, so as to limit the permanent magnets on the rotor core, the permanent magnets are fixed on the rotor core by the magnetic conducting assembly, the accuracy of the installation of the permanent magnets is improved, the material of the magnetic conducting assembly meets the magnetic conducting demand, and the rotor structure with different salient pole ratios can be obtained by adjusting the structure of the magnetic conducting assembly.

Description

Technical Field

[0001] This invention relates to the field of axial magnetic field motors, and more particularly to a rotor structure for an axial magnetic field motor. Background Technology

[0002] Axial field motors, also known as disc motors, have advantages such as small axial dimensions, high torque density, high power density, and high efficiency, and are widely used in electric vehicles, general industrial applications, and household appliances. The rotor and stator of an axial field motor are parallel, forming an air gap between them.

[0003] A rotor typically consists of a fixed disk and permanent magnets mounted on the fixed disk. The accuracy of the permanent magnets' mounting position directly affects the performance of an axial magnetic field motor. If the permanent magnets lack protection, they are prone to loosening relative to the fixed disk, and they can also generate eddy currents that heat up, affecting motor performance. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides an axial magnetic field motor rotor structure that uses pole shoe cores to fix permanent magnets. The pole shoe cores satisfy the requirements for fixing permanent magnets, as well as for magnetic conduction, and also reduce eddy current losses. Furthermore, the number of components is reduced, and assembly processes are effectively minimized.

[0005] The present invention provides an axial magnetic field motor rotor structure, including a rotor core, a plurality of permanent magnets and at least one magnetic guiding component. The plurality of permanent magnets are arranged at circumferential intervals. The axial inner surface of the permanent magnets is disposed on the rotor core. The magnetic guiding component covers the axial outer surface of the permanent magnets and the two circumferential sides of the permanent magnets to confine the permanent magnets on the rotor core.

[0006] In a preferred embodiment, the upper surface of the permanent magnet is completely covered by the magnetic conductive component.

[0007] In a preferred embodiment, the magnetically conductive component includes a pole shoe core, which includes a plurality of surface bodies and a plurality of inter-pole bodies, wherein the surface bodies and the inter-pole bodies are alternately connected to form a ring-shaped and integral pole shoe core.

[0008] The permanent magnet is axially confined between the surface body and the rotor core, and the permanent magnet is circumferentially confined between two adjacent interpole bodies.

[0009] In a preferred embodiment, the thickness of the magnetic conductive component located on the surface of the permanent magnet is equal to the thickness of the magnetic conductive component located between adjacent permanent magnets.

[0010] In a preferred embodiment, the inter-pole body includes an inter-pole base plate and two inter-pole side plates. The inter-pole base plate is located between two adjacent permanent magnets and is fixed to the rotor core. The inter-pole side plates are connected between the inter-pole base plate and the surface body, and the inter-pole side plates abut against the circumferential side surfaces of the permanent magnets. The thickness of the inter-pole base plate is equal to the thickness of the surface body.

[0011] In a preferred embodiment, the thickness of the interpole body is greater than the thickness of the surface body, the outer surface of the interpole body in the axial direction is flush with the outer surface of the surface body in the axial direction, and an air gap is reserved between the inner surface of the interpole body in the axial direction and the rotor core.

[0012] In a preferred embodiment, a baffle is further included, which is disposed between the permanent magnet and the interpole.

[0013] In a preferred embodiment, the magnetic guiding assembly includes a plurality of pole shoe cores, and each permanent magnet is fixed to the rotor core by a pole shoe core. Each pole shoe core includes a surface body and two side bodies. The two side bodies are respectively connected to the circumferential sides of the surface body. The permanent magnet is axially limited between the surface body and the rotor core, and circumferentially limited between the two side bodies.

[0014] In a preferred embodiment, the pole shoe core further includes an inner body and an outer body. The inner body is connected to the radially inner side of the surface body, and the outer body is connected to the radially outer side of the surface body. The inner body and the outer body are fixed to the rotor core, and the permanent magnet is radially limited between the inner body and the outer body.

[0015] In a preferred embodiment, a pressure plate is also included, which is fixed on the rotor core to fix the pole shoe core disposed on the axial outer surface of the permanent magnet.

[0016] In a preferred embodiment, the permanent magnet is radially confined on the rotor core and / or pole shoe core.

[0017] Compared with existing technologies, this technical solution has the following advantages:

[0018] The permanent magnet is fixed to the rotor core using the magnetic guide assembly, improving the accuracy of the permanent magnet installation. This meets the high-speed rotation requirements of axial flux motors for electric vehicles, ensuring reliable and stable motor operation. Furthermore, the material of the magnetic guide assembly can be adjusted to meet magnetic conductivity requirements, and rotor structures with different saliency ratios can be designed based on the structure of the magnetic guide assembly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first embodiment of the axial magnetic field motor rotor structure described in this invention;

[0020] Figure 2 This is an exploded view of the first embodiment of the axial magnetic field motor rotor structure described in this invention;

[0021] Figure 3 This is a perspective view of the pole shoe core in the first embodiment of the axial magnetic field motor rotor structure of the present invention;

[0022] Figure 4 This is a top view of the pole shoe core in the first embodiment of the axial magnetic field motor rotor structure of the present invention;

[0023] Figure 5 This is a perspective view of the first embodiment of the permanent magnet described in this invention;

[0024] Figure 6 This is a front view of the first embodiment of the permanent magnet described in this invention;

[0025] Figure 7 This is a perspective view of the second embodiment of the permanent magnet described in this invention;

[0026] Figure 8 This is a front view of the second embodiment of the permanent magnet described in this invention;

[0027] Figure 9 This is a schematic diagram of the assembly of the pole shoe core and permanent magnet in the first embodiment of the axial magnetic field motor rotor structure of the present invention;

[0028] Figure 10 This is a schematic diagram of the rotor core structure in the first embodiment of the axial magnetic field motor rotor structure of the present invention;

[0029] Figure 11 This is a schematic diagram of the structure of the first iron core in the first embodiment of the axial magnetic field motor rotor structure of the present invention;

[0030] Figure 12 This is a schematic diagram of the second embodiment of the axial magnetic field motor rotor structure described in this invention;

[0031] Figure 13 This is an exploded view of the second embodiment of the axial magnetic field motor rotor structure described in this invention;

[0032] Figure 14 This is a cross-sectional view of a second embodiment of the axial magnetic field motor rotor structure described in this invention;

[0033] Figure 15 This is a schematic diagram of the pole shoe core structure in the second embodiment of the axial magnetic field motor rotor structure of the present invention;

[0034] Figure 16 This is a schematic diagram of the assembly of the pole shoe core and permanent magnet in the second embodiment of the axial magnetic field motor rotor structure of the present invention;

[0035] Figure 17 This is a schematic diagram of the first iron core in the second embodiment of the axial magnetic field motor rotor structure of the present invention;

[0036] Figure 18 This is a schematic diagram of the third embodiment of the axial magnetic field motor rotor structure described in this invention;

[0037] Figure 19 This is an exploded view of the third embodiment of the axial magnetic field motor rotor structure described in this invention;

[0038] Figure 20 This is a cross-sectional view of the third embodiment of the axial magnetic field motor rotor structure described in this invention;

[0039] Figure 21 This is a schematic diagram of the pole shoe core structure in the third embodiment of the axial magnetic field motor rotor structure of the present invention;

[0040] Figure 22 This is a schematic diagram of the assembly of the pole shoe core and permanent magnet in the third embodiment of the axial magnetic field motor rotor structure of the present invention;

[0041] Figure 23 This is a schematic diagram of the first iron core in the third embodiment of the axial magnetic field motor rotor structure of the present invention;

[0042] Figure 24 This is a schematic diagram of the fourth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0043] Figure 25 This is an exploded view of the fourth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0044] Figure 26 This is a schematic diagram of the pole shoe core structure in the fourth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0045] Figure 27 This is a schematic diagram of the assembly of the pole shoe core and permanent magnet in the fourth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0046] Figure 28 This is a schematic diagram of the fifth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0047] Figure 29 This is an exploded view of the fifth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0048] Figure 30This is a cross-sectional view of the fifth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0049] Figure 31 This is a schematic diagram of the permanent magnet structure in the fifth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0050] Figure 32 This is a schematic diagram of the pole shoe core structure in the fifth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0051] Figure 33 This is a schematic diagram of the assembly of the pole shoe core and permanent magnet in the fifth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0052] Figure 34 This is a schematic diagram of the pressure plate in the fifth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0053] Figure 35 This is a schematic diagram of the assembly of the pressure plate, pole shoe core and permanent magnet in the fifth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0054] Figure 36 This is a schematic diagram of the first iron core in the fifth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0055] Figure 37 This is a schematic diagram of the sixth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0056] Figure 38 This is an exploded view of the sixth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0057] Figure 39 This is a cross-sectional view of the sixth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0058] Figure 40 This is a schematic diagram of the pole shoe core structure in the sixth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0059] Figure 41 This is a schematic diagram of the assembly of the pole shoe core and permanent magnet in the sixth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0060] Figure 42 This is a schematic diagram of the pressure plate in the sixth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0061] Figure 43 This is a schematic diagram of the assembly of the pressure plate, permanent magnet and pole shoe core in the sixth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0062] Figure 44This is a schematic diagram of the first iron core in the sixth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0063] Figure 45 This is a schematic diagram of the seventh embodiment of the axial magnetic field motor rotor structure described in this invention;

[0064] Figure 46 This is an exploded view of the seventh embodiment of the axial magnetic field motor rotor structure described in this invention;

[0065] Figure 47 This is a cross-sectional view of the seventh embodiment of the axial magnetic field motor rotor structure described in this invention;

[0066] Figure 48 This is a schematic diagram of the pressure plate in the seventh embodiment of the axial magnetic field motor rotor structure of the present invention;

[0067] Figure 49 This is a schematic diagram of the first iron core in the seventh embodiment of the axial magnetic field motor rotor structure of the present invention.

[0068] Figure 50 This is a schematic diagram of the eighth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0069] Figure 51 This is an exploded view of the eighth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0070] Figure 52 This is a bottom view of the pole shoe core in the eighth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0071] Figure 53 This is a top view of the pole shoe core in the eighth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0072] Figure 54 This is a schematic diagram of the assembly of the pole shoe core and the permanent magnet in the eighth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0073] Figure 55 This is a schematic diagram of the ninth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0074] Figure 56 This is an exploded view of the ninth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0075] Figure 57 This is a schematic diagram of the baffle structure in the ninth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0076] Figure 58 This is a schematic diagram of the assembly of the baffle and permanent magnet in the ninth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0077] Figure 59 This is a schematic diagram of the assembly of the baffle, permanent magnet and pole shoe core in the ninth embodiment of the axial magnetic field motor rotor structure of the present invention. Detailed Implementation

[0078] like Figure 2 , Figure 13 , Figure 19 , Figure 25 , Figure 29 , Figure 38 , Figure 46 , Figure 51 and Figure 57 As shown, the axial magnetic field motor rotor structure includes a rotor core 100, a plurality of permanent magnets 200, and at least one magnetic guiding component 700. The plurality of permanent magnets 200 are arranged at circumferential intervals. The axial inner surface of the permanent magnets 200 is disposed on the rotor core 100. The magnetic guiding component 700 covers the axial outer surface of the permanent magnets 200 and the two circumferential sides of the permanent magnets 200 to confine the permanent magnets 200 on the rotor core 100.

[0079] The permanent magnet 200 is fixed to the rotor core 100 using the magnetic guide component 700, improving the accuracy of the permanent magnet 200 installation. This meets the high-speed rotation requirements of axial flux motors for electric vehicles, ensuring reliable and stable motor operation. Furthermore, the material of the magnetic guide component 700 can be used to meet magnetic conductivity requirements, and its structure can be adjusted to design rotor structures with different saliency ratios.

[0080] First Embodiment

[0081] like Figures 1 to 11 As shown, in the axial magnetic field motor rotor structure of the first embodiment, the magnetic guide assembly 700 includes a pole shoe core 300, that is, all the permanent magnets 200 are limited and fixed on the rotor core 100 by the pole shoe core 300.

[0082] like Figures 2 to 4 As shown, the pole shoe core 300 includes a plurality of surface bodies 310 and a plurality of inter-pole bodies 320, which are alternately connected to form a ring-shaped and integral pole shoe core 300. The permanent magnet 200 is axially confined between the surface bodies 310 and the rotor core 100, and circumferentially confined between two adjacent inter-pole bodies 320.

[0083] The pole shoe core 300 is formed by alternating and interleaved connections of the surface body 310 and the inter-pole body 320. The surface body 310 and the rotor core 100 axially limit and fix the permanent magnet 200, while adjacent inter-pole bodies 320 circumferentially limit and fix the permanent magnet 200. This ensures the permanent magnet 200 is securely positioned between the rotor core 100 and the pole shoe core 300, improving the accuracy of the permanent magnet 200's installation and guaranteeing the reliability and stability of the motor operation. Furthermore, since the pole shoe core 300 is a single, integrated structure, it reduces the number of parts and assembly steps. Additionally, by designing the surface body 310 and inter-pole body 320 with different axial dimensions, rotor structures with different saliency ratios can be designed, achieving manufacturability and simultaneously increasing application scenarios and efficiency.

[0084] like Figure 10 and Figure 11 As shown, the rotor core 100 includes a first core 110, which includes a mounting surface 111, an inner boss 112, and an outer boss 113. The inner boss 112 and the outer boss 113 protrude upwards onto the mounting surface 111. The permanent magnet 200 is disposed on the mounting surface 111, and its radial sides abut against the inner boss 112 and the outer boss 113, respectively. It is evident that the permanent magnet 200 is radially confined on the rotor core 100.

[0085] The first iron core 110 has a disc-shaped structure and uses high-strength structural materials to enhance its support capacity. The inner boss 112 is located radially inside the mounting surface 111, and the outer boss 113 is located radially outside the mounting surface 111. The mounting surface 111, the inner boss 112, and the outer boss 113 are all annular structures. The shape and size of the inner boss 112 and the outer boss 113 are matched with the permanent magnet 200, and their height should not exceed 50% of the axial dimension of the permanent magnet 200 to prevent the permanent magnet 200 from deforming or detaching under high-speed centrifugal force.

[0086] refer to Figure 2 and Figure 11 The inner protrusion 112 is provided with a plurality of circumferentially spaced limiting portions 114, each of which is disposed between two adjacent permanent magnets 200. It can be seen that a limiting portion 114 and an interpole body 320 are disposed between two adjacent permanent magnets 200. The limiting portion 114 and the interpole body 320 can be arranged radially spaced, and both can jointly limit the permanent magnet 200 circumferentially, preventing the permanent magnet 200 from shifting circumferentially.

[0087] like Figure 10 As shown, the rotor core 100 also includes a second core 120. A plurality of mounting slots 1111 are formed on the mounting surface 111, and the second core 120 is embedded within the mounting slots 1111. By forming the mounting slots 1111, the eddy current flow resistance on the first core 110 can be further increased, reducing its eddy current loss. By setting the second core 120 within the mounting slots 1111, its structural strength is ensured.

[0088] Specifically, the mounting groove 1111 is annular, and several mounting grooves 1111 are arranged radially at intervals. Each mounting groove 1111 contains a second iron core 120, meaning the second iron core 120 is also annular. The second iron core 120 can be made of a mixture of iron-silicon powder and high-viscosity adhesive, serving a magnetic conductive function, improving the bonding ability between the second iron core 120 and the first iron core 110, and facilitating the molding of the second iron core 120.

[0089] like Figure 2 and Figure 11 As shown, the permanent magnet 200 is trapezoidal, and its width gradually increases radially from the inside to the outside. The inner radial surface of the permanent magnet 200 is concave and fits onto the inner boss 112, while the outer radial surface is convex and fits onto the outer boss 113. The axial inner surface of the permanent magnet 200 abuts against the mounting surface 111 of the rotor core 100, the axial outer surface of the permanent magnet 200 abuts against the surface layer 310, and the two circumferential sides of the permanent magnet 200 abut against the interpole body 320.

[0090] It can be seen that the inner radial side of the permanent magnet 200 is adapted to the inner protrusion 112, and the outer radial side of the permanent magnet 200 is adapted to the outer protrusion 113. The two radial sides of the permanent magnet 200 can each be provided with a chamfered right-angle structure or a stepped structure. Similarly, the two circumferential sides of the permanent magnet 200 are adapted to the interpole body 320, and the two circumferential sides of the permanent magnet 200 are each provided with a chamfered right-angle structure or a stepped structure.

[0091] Taking the two circumferential sides of the permanent magnet 200 as an example, the inverted right-angle structure and the stepped structure are introduced as follows:

[0092] refer to Figure 5 and Figure 6The permanent magnet 200 has two circumferentially adjacent side surfaces, each comprising a first surface 210 and a second surface 220. The first surface 210 extends between the outer axial surface of the permanent magnet 200 and the second surface 220, while the second surface 220 extends between the first surface 210 and the inner axial surface of the permanent magnet 200. The axial dimension of the first surface 210 is denoted as 'a', and the axial dimension of the second surface 220 is denoted as 'b', where a > b. The second surface 220 is perpendicular to both the outer and inner axial surfaces of the permanent magnet 200, while the first surface 210 is inclined relative to the second surface 220, with an inclination angle denoted as 'θ', so that the two circumferentially adjacent side surfaces of the permanent magnet 200 form a right-angled structure.

[0093] refer to Figure 7 and Figure 8 The permanent magnet 200 has three circumferential sides, each comprising a third surface 230, a fourth surface 240, and a fifth surface 250 connected sequentially. The third surface 230 extends between the outer axial surface of the permanent magnet 200 and the fourth surface 240, and the fifth surface 250 extends between the fourth surface 240 and the inner axial surface of the permanent magnet 200. The third surface 230 and the fifth surface 250 are parallel and perpendicular to the outer and inner axial surfaces of the permanent magnet 200, respectively. The fourth surface 240 is perpendicular to both the third surface 230 and the fifth surface 250. The axial dimension of the third surface 230 is denoted as c, the axial dimension of the fifth surface 250 is denoted as d, and the width of the fourth surface 240 is denoted as e. C, d, and e are determined according to electromagnetic design requirements. The two circumferential sides of the permanent magnet 200 form a stepped structure.

[0094] See Figure 1 and Figure 2 The pole shoe core 300 encloses the permanent magnet 200 and is located on the side near the air gap.

[0095] like Figures 2 to 4 As shown, the pole shoe core 300 includes a plurality of surface bodies 310 and a plurality of inter-pole bodies 320, which are alternately connected to form a ring-shaped and integral pole shoe core 300. An inter-pole body 320 is connected between two adjacent surface bodies 310, so that the surface bodies 310 and inter-pole bodies 320 are alternately connected.

[0096] The surface body 310 is adapted to the shape of the permanent magnet 200, and after the surface body 310 and the permanent magnet 200 are assembled, their outer peripheries are aligned, that is, the upper surface of the permanent magnet 200 is completely covered by the magnetic conductive component 700.

[0097] like Figure 2 and Figure 3 As shown, the inter-pole body 320 includes an inter-pole base plate 321 and two inter-pole side plates 322. The inter-pole base plate 321 is located between two adjacent permanent magnets 200 and is fixed to the rotor core 100. The inter-pole side plates 322 are connected between the inter-pole base plate 321 and the surface body 310, and the inter-pole side plates 322 abut against the circumferential side surface of the permanent magnet 200.

[0098] The inter-electrode base plate 321 is trapezoidal, and its width gradually decreases radially from the inside to the outside to accommodate installation between two adjacent permanent magnets 200. The radially outer sides of the inter-electrode base plate 321 and the radially outer sides of the inter-electrode side plate 322 are flush with the radially outer sides of the surface body 310, while the radially inner sides of the inter-electrode base plate 321 and the radially inner sides of the inter-electrode side plate 322 are flush with each other and are recessed relative to the radially inner side of the surface body 310, thus avoiding the positioning portion 114.

[0099] refer to Figure 9 The inter-pole side plate 322 is adapted to the circumferential sides of the permanent magnet 200, wherein the circumferential sides of the permanent magnet 200 can be chamfered right angles or stepped structures.

[0100] The pole shoe core 300 is made of a material with high magnetic permeability, high strength, and low electrical conductivity to meet the magnetic conductivity requirements. Different saliency ratios can be obtained by designing different axial dimensions of the inter-pole base plate 321 and the surface body 310, where the calculation formula for the saliency ratio is:

[0101] ρ=L q / L d

[0102] ρ is the salient pole ratio, L q For Q-axis inductance, L d For the D-axis inductance, L q and L d The magnitude of L is related to the magnetic reluctance along the Q-axis and D-axis magnetic paths. Within the rotor range, the difference between the Q-axis and D-axis magnetic paths is as follows: the Q-axis magnetic path runs along the inter-pole base plate 321, while the D-axis magnetic path runs along the permanent magnet 200 and the surface layer 310. Furthermore, the axial dimension of the inter-pole base plate 321 is equal to the axial dimension of the surface layer 310. Since the inter-pole base plate 321 and the surface layer 310 are made of highly permeable materials, their permeability is much greater than that of air. The permeability of the permanent magnet 200 is comparable to that of air. Therefore, the magnetic reluctance along the Q-axis magnetic path is equal to that along the D-axis magnetic path, i.e., L... q＝ L d Therefore, the salient pole ratio ρ = Lq / L d =1, meaning that a rotor structure with a salient pole ratio of 1 is designed.

[0103] It can be seen that the thickness of the magnetic conductive component 700 located on the surface of the permanent magnet 200 is equal to the thickness of the magnetic conductive component 700 located between adjacent permanent magnets 200, resulting in a rotor structure with a saliency ratio of 1.

[0104] refer to Figure 3 The axial dimension of the inter-electrode base plate 321 is equal to the axial dimension of the surface layer 310. The axial dimension of the inter-electrode base plate 321 is its thickness. The inter-electrode base plate 321, the surface layer 310, and the inter-electrode side plate 322 have the same thickness, meaning the pole shoe core 300 is a single, uniform structure. Furthermore, on the upper surface of the pole shoe core 300, the surface layer 310 protrudes upwards, while the inter-electrode base plate 321 is recessed downwards.

[0105] like Figure 3 and Figure 4 As shown, the pole shoe core 300 has a plurality of slits 3000, which penetrate the surface body 310 and / or the inter-pole body 320. By providing the slits 3000, the induced eddy currents in the pole shoe core 300 are blocked, reducing their eddy current losses, and a conductive path is provided for the high-order harmonic magnetic field in the air gap, thus greatly reducing the high-order harmonic magnetic field passing through the rotor core, thereby significantly reducing the eddy current losses and hysteresis losses in the rotor core.

[0106] The gap 3000 can be annular, linear, or other shapes. The gap 3000 on the surface body 310 penetrates the surface body 310, and the gap 3000 on the inter-electrode base plate 321 penetrates the inter-electrode base plate 321. The gap 3000 on the surface body 310 extends to the inter-electrode side plate 322, but does not completely penetrate the inter-electrode side plate 322, to avoid breakage of the pole shoe core 300.

[0107] Provided that the requirements for rotor mechanical strength and magnetic conductivity are met, a greater number and longer gaps will help reduce eddy current losses in the pole shoes and rotor core. In addition, the width of the gap 3000 should not exceed 20% of the radial dimension of the permanent magnet 200, which can significantly reduce the eddy current losses of the pole shoe core 300 without causing the pole shoe core 300 to become oversaturated.

[0108] like Figure 2 , Figure 3 and Figure 11As shown, the inter-pole body 320 and the rotor core 100 are fixed together by screws 500. The inter-pole body 320 has a plurality of screw holes 3211, and the rotor core 100 has a threaded hole 11112 opposite to the screw holes 3211. The screws 500 pass through the screw holes 3211 and the threaded hole 1112 for screwing.

[0109] The screw holes 3211 are specifically located on the inter-pole base plate 321 to fix the pole shoe core 300 and the rotor core 100, and effectively improve the fastening effect, which is particularly suitable for medium and high speed motors. Each inter-pole body 320 can be fixed by screws 500 of different sizes, which can be selected according to different design requirements.

[0110] An air gap is provided between the inner surface of the pole piece 320 and the rotor core 100. This is used to reduce eddy current losses in the pole piece core without causing a significant increase in Q-axis magnetic reluctance.

[0111] The assembly method of the rotor structure of the axial magnetic field motor is as follows:

[0112] A plurality of permanent magnets 200 are placed on the rotor core 100, and the plurality of permanent magnets 200 are arranged at circumferential intervals. The permanent magnets 200 are disposed on the mounting surface 111 and abut against the inner boss 112 and the outer boss 113.

[0113] The pole shoe core 300 is mounted on the rotor core 100. A screw 500 passes through the inter-pole body 320 of the pole shoe core 300 and is screwed onto the rotor core 100, so that the permanent magnet 200 is confined between the pole shoe core 300 and the rotor core 100. Specifically, the permanent magnet 200 is confined between the rotor core 100 and the surface body 310 of the pole shoe core 300, and between two adjacent inter-pole bodies 320.

[0114] In summary, the pole shoe core 300 is formed by the surface body 310 and the inter-pole body 320 connected at intervals. The surface body 310 and the rotor core 100 are used to axially limit and fix the permanent magnet 200, and the two adjacent inter-pole bodies 320 are used to circumferentially limit and fix the permanent magnet 200. In addition, the inter-pole body 320 and the permanent magnet 200 can be axially and circumferentially limited by the cooperation of the inclined surface structure or the stepped structure. The inner boss 112 and the outer boss 113 on the rotor core 100 are used to radially limit and fix the permanent magnet 200, so as to improve the installation accuracy of the permanent magnet 200 and enhance the fastening effect on the permanent magnet 200, which can meet the high-speed rotation requirements of the axial flux motor for electric vehicles. Furthermore, the pole shoe core 300 has a slot 3000, which reduces eddy current losses and utilizes its material to meet magnetic conductivity requirements, thereby improving motor efficiency and enhancing the safety and reliability of the permanent magnet. It also allows for the design of rotor structures with different saliency ratios. Since the pole shoe core 300 is a single-piece structure, the number of parts is reduced, effectively minimizing assembly steps and increasing application scenarios and efficiency.

[0115] Second Embodiment

[0116] like Figures 12 to 17 As shown, in the rotor structure of the axial magnetic field motor in the second embodiment, the magnetic guiding component 700 includes a plurality of magnetic guiding cores 300, and each of the permanent magnets 200 is respectively limited and fixed on the rotor core 100 by a pole shoe core 300.

[0117] like Figure 14 As shown, the pole shoe core 300 includes a surface body 310 and two side bodies 350. The two side bodies 350 are respectively connected to the circumferential sides of the surface body 310. The permanent magnet 200 is axially limited between the surface body 310 and the rotor core 100, and circumferentially limited between the two side bodies 350. More specifically, the pole shoe core 300 also includes an inner side body 330 and an outer side body 340. The inner side body 330 is connected to the radially inner side of the surface body 310, and the outer side body 340 is connected to the radially outer side of the surface body 310. The inner side body 330 and the outer side body 340 are fixed to the rotor core 100, and the permanent magnet is radially limited between the inner side body 330 and the outer side body 340.

[0118] Each of the permanent magnets 200 is enclosed by a pole shoe core 300. The permanent magnet 200 is radially confined between the inner body 330 and the outer body 340, axially confined between the surface body 310 and the rotor core 100, and circumferentially confined between the two side bodies 350. This ensures that the permanent magnet 200 is securely positioned between the rotor core 100 and the pole shoe core 300, while also improving the accuracy of the permanent magnet 200 installation. This meets the high-speed rotation requirements of axial flux motors for electric vehicles, ensuring the reliability and stability of motor operation.

[0119] like Figure 13 , Figure 14 and Figure 17 As shown, the rotor core 100 includes a first core 110, which includes a mounting surface 111, an inner boss 112, and an outer boss 113. The inner boss 112 protrudes upward and is located radially inner to the mounting surface 111, and the outer boss 113 protrudes upward and is located radially outer to the mounting surface 111. The inner body 330 is fixed to the inner boss 112, and the outer body 340 is fixed... On the outer boss 113, the permanent magnet 200 is disposed on the mounting surface 111. The radial inner side of the permanent magnet 200 abuts against the inner boss 112 and the inner side body 330, respectively, and the radial outer side of the permanent magnet 200 abuts against the outer boss 113 and the outer side body 340, respectively. It can be seen that the pole shoe core 300 and the first core 110 work together to radially limit the permanent magnet 200.

[0120] The first iron core 110 can be made of high-strength structural material to improve its support capacity. The first iron core 110 has a disc-shaped structure, and the mounting surface 111, the inner boss 112, and the outer boss 113 are all annular structures. The shape and size of the inner boss 112 and the outer boss 113 are matched with the permanent magnet 200, and their height should not exceed 50% of the axial dimension of the permanent magnet 200, so as to prevent the permanent magnet 200 from deforming or detaching under the action of high-speed centrifugal force.

[0121] refer to Figure 13 and Figure 17 The inner protrusion 112 is provided with a plurality of circumferentially spaced limiting parts 114, each of which is disposed between two adjacent permanent magnets 200, and can circumferentially limit the permanent magnets 200.

[0122] like Figure 14 and Figure 17As shown, the rotor core 100 also includes a second core 120. A plurality of mounting slots 1111 are formed on the mounting surface 111, and the second core 120 is embedded within the mounting slots 1111. By forming the mounting slots 1111, the eddy current flow resistance on the first core 110 can be further increased, reducing its eddy current loss. By setting the second core 120 within the mounting slots 1111, its structural strength is ensured.

[0123] Specifically, the mounting groove 1111 is annular, and several mounting grooves 1111 are arranged radially at intervals. Each mounting groove 1111 contains a second iron core 120, meaning the second iron core 120 is also annular. The second iron core 120 can be made of a mixture of iron-silicon powder and high-viscosity adhesive, serving a magnetic conductive function, improving the bonding ability between the second iron core 120 and the first iron core 110, and facilitating the molding of the second iron core 120.

[0124] like Figure 15 As shown, the pole shoe core 300 also includes two side bodies 350, which are respectively connected to the circumferential sides of the surface body 310. (Refer to...) Figure 14 The permanent magnet 200 is circumferentially confined between the two side bodies 350. The inner body 330 is abutted and fixed to the inner boss 112, and the outer body 340 is abutted and fixed to the outer boss 113. There is a gap between the side body 350 and the mounting surface 111, and a notch 351 is provided between the side body 350 and the inner body 330 to avoid the limiting part 114. It can be seen that the permanent magnet 200 is circumferentially confined under the combined action of the side body 350 and the limiting part 114.

[0125] like Figure 14 and Figure 15 As shown, the inner body 330 includes an inner side portion 331 and an inner fixing portion 332. The inner side portion 331 extends and connects between the inner fixing portion 332 and the surface body 310. The inner fixing portion 332 is fixed to the rotor core 100.

[0126] The outer body 340 includes two outer portions 341 and two outer fixing portions 342. Each outer portion 341 extends and connects to one of the outer fixing portions 342 and the surface body 310. The outer fixing portion 342 is fixed to the rotor core 100.

[0127] The permanent magnet 200 is radially limited between the inner edge 331 and the outer edge 341.

[0128] Specifically, the inner fixing part 332 is provided with an inner mounting hole 333, and the inner boss 112 is provided with an internal threaded hole 1121 opposite to the inner mounting hole 333. (Refer to...) Figure 2 , Figure 4 and Figure 10 A screw 500 passes through the inner mounting hole 333 and is screwed into the inner threaded hole 1121 to fix the inner fixing part 332 to the inner boss 112. Similarly, the outer fixing part 342 has an outer mounting hole 343, and the outer boss 113 has an outer threaded hole 1131 opposite to the outer mounting hole 343. A screw 500 passes through the outer mounting hole 343 and is screwed into the outer threaded hole 1131 to fix the outer fixing part 342 to the outer boss 113. Fixing with screws 500 effectively improves the fastening effect, making it particularly suitable for medium and high-speed motors.

[0129] like Figure 15 and Figure 16 As shown, since the radial outer surface of the permanent magnet 200 is simultaneously limited by the outer protrusion 113 and the outer body 340, the radial limiting capability of the permanent magnet 200 can be guaranteed by using two outer bodies 340 spaced apart on both sides of the surface body 310, while also reducing the amount of material used in the pole shoe core 300, thereby reducing the cost of use.

[0130] In addition, the two external fixing parts 342 located on the same pole shoe core 300 have a height difference. When two adjacent pole shoe cores 300 are assembled, the two external fixing parts 342 located on different pole shoe cores 300 and close to each other are stacked. The external mounting holes 343 of the two stacked external fixing parts 342 are arranged opposite each other, which not only makes the structure more compact and increases the design space, but also reduces the amount of screws used, thereby reducing costs.

[0131] like Figure 15 As shown, the pole shoe core 300 has several slits 3000, which penetrate the surface body 310. By providing the slits 3000, the induced eddy currents in the pole shoe core 300 are blocked, reducing their eddy current losses, and a conductive path is provided for the high-order harmonic magnetic field in the air gap, greatly reducing the high-order harmonic magnetic field passing through the rotor core, thus significantly reducing the eddy current losses and hysteresis losses in the rotor core.

[0132] like Figures 13 to 16As shown, the permanent magnet 200 is trapezoidal, and its width gradually increases radially from the inside to the outside. The surface body 310 is adapted to the shape of the permanent magnet 200, and after the surface body 310 and the permanent magnet 200 are assembled, their outer circumferences are aligned. The axial inner surface of the permanent magnet 200 abuts against the mounting surface 111 of the rotor core 100, and the axial outer surface of the permanent magnet 200 abuts against the surface body 310.

[0133] The permanent magnet 200 has a right-angled structure or a stepped structure on its two circumferential sides; and / or, the permanent magnet 200 has a right-angled structure or a stepped structure on its two radial sides.

[0134] Within the rotor range, the difference between the Q-axis and D-axis in their magnetic transmission paths is as follows: the Q-axis magnetic transmission path runs between adjacent permanent magnets 200, while the D-axis magnetic transmission path runs between the permanent magnets 200 and the surface layer 310. Since the surface layer 310 uses a high-permeability material, its permeability is much greater than that of air, while the permeability of the permanent magnets 200 is comparable to that of air. Furthermore, the interpole space between the permanent magnets 200 is air. Therefore, the magnetic reluctance is greater on the Q-axis magnetic transmission path and smaller on the D-axis magnetic transmission path, i.e., L... q <L d Therefore, the salient pole ratio ρ = L q / L d <1, meaning that a rotor structure with a salient pole ratio of less than 1 is designed.

[0135] The assembly method of the rotor structure of the axial magnetic field motor is as follows:

[0136] A plurality of permanent magnets 200 are placed on the rotor core 100, and the plurality of permanent magnets 200 are arranged at circumferential intervals. The permanent magnets 200 are disposed on the mounting surface 111 and abut against the inner boss 112 and the outer boss 113.

[0137] The pole shoe cores 300 are placed one by one on the outer surface of each permanent magnet 200 and fixed to the rotor core 100 by screws 500, so that the permanent magnets 200 are confined between the pole shoe cores 300 and the rotor core 100. The permanent magnets 200 are axially confined between the surface body 310 and the rotor core 100, circumferentially confined between the two side bodies 350, with the radially inner surface of the permanent magnets 200 abutting against the inner boss 112 and the inner edge 331, and the radially outer surface of the permanent magnets 200 abutting against the outer boss 113 and the outer edge 341.

[0138] In summary, each permanent magnet 200 is enclosed by a pole shoe core 300 and fixed to the rotor core 100. The radial inner surface of the permanent magnet 200 is simultaneously limited by the inner boss 112 and the inner side body 330, and the radial outer surface of the permanent magnet 200 is simultaneously limited by the outer boss 113 and the outer side body 340. The permanent magnet 200 is axially limited between the surface body 310 and the rotor core 100, and circumferentially limited between the two side bodies 350. This ensures that the permanent magnet 200 can be firmly fixed between the rotor core 100 and the pole shoe core 300, while improving the accuracy of the installation of the permanent magnet 200. This meets the high-speed rotation requirements of axial flux motors for electric vehicles and ensures the reliability and stability of motor operation. Furthermore, the pole shoe core 300 has a gap 3000, which reduces eddy current losses and utilizes its material to meet magnetic conductivity requirements, improving motor efficiency and enhancing the safety and reliability of the permanent magnet operation. Moreover, the pole shoe core 300 only encloses the permanent magnet 200, without involving the space between adjacent permanent magnets 200, thus freeing up the inter-pole space between adjacent permanent magnets 200. This increases the space available for placing the permanent magnets 200, allowing for a larger inner and outer pole arc coefficient, even to 1, thereby improving the motor's torque and power output capabilities.

[0139] Third Embodiment

[0140] refer to Figures 18 to 23 The axial magnetic field motor of the third embodiment differs from that of the second embodiment in the structure of the pole shoe core 300 and the first core 110.

[0141] like Figure 19 , Figure 20 and Figure 23 As shown, the rotor core 100 includes a first core 110, which includes a mounting surface 111 and an inner boss 112. The inner boss 112 protrudes upward and is radially inner to the mounting surface 111. An inner body 330 is fixed to the inner boss 112, and an outer body 340 is fixed to the mounting surface 111. A permanent magnet 200 is disposed on the mounting surface 111. The radially inner surface of the permanent magnet 200 abuts against the inner boss 112 and the inner body 330, respectively, and the radially outer surface of the permanent magnet 200 abuts against the outer body 340. Compared to the second embodiment, the first core 110 of the third embodiment omits the outer boss 113 of the second embodiment. See [link to third embodiment]. Figure 17 This can significantly reduce losses on the rotor core and improve motor efficiency.

[0142] like Figure 21 and Figure 22As shown, the outer body 340 of the pole shoe core 300 includes an outer edge 341 and an outer fixing part 342. The outer edge 341 extends downward from the radial outer edge of the surface body 310. It can be seen that the circumferential dimensions of the outer edge 341 and the outer fixing part 342 are relatively long, which can increase the contact area between the outer edge 341 and the permanent magnet 200 after the outer boss 113 is removed, thereby improving the fixing effect.

[0143] refer to Figure 21 The outer fixing part 342 has two outer mounting holes 343, which are respectively located on both sides of the outer fixing part 342 in the circumferential direction. The two sides of the outer fixing part 342 have a height difference. Thus, when two adjacent pole shoe cores 300 are assembled, the two outer fixing parts 342 located on different pole shoe cores 300 and close to each other are stacked. The outer mounting holes 343 of the two stacked outer fixing parts 342 are arranged opposite each other. (Refer to...) Figure 12 .

[0144] like Figure 23 As shown, the external threaded hole 1131 is formed on the mounting surface 111. Thus, when the external fixing part 342 is disposed on the mounting surface 111, the external mounting hole 343 on the external fixing part 342 corresponds to the external threaded hole 1131 on the mounting surface 111, and is then fixed by screws 500. (Refer to...) Figure 18 , Figure 19 and Figure 23 .

[0145] Fourth embodiment

[0146] refer to Figures 24 to 27 The axial magnetic field motor of the fourth embodiment differs from that of the third embodiment in the structure of the pole shoe core 300.

[0147] The inner fixing portions 332 of a plurality of pole shoe cores 300 are integrally connected to form a whole; and / or, the outer fixing portions 342 of a plurality of pole shoe cores 300 are integrally connected to form a whole.

[0148] Specifically, the inner fixing part 332 of several pole shoe cores 300 forms an integrated ring structure, and similarly, the outer fixing part 342 of several pole shoe cores 300 forms an integrated ring structure. This enables several pole shoe cores 300 to form a whole, effectively improving assembly efficiency.

[0149] Fifth Embodiment

[0150] like Figures 28 to 36 As shown, in the axial magnetic field motor rotor structure of the fifth embodiment, the pole shoe core 300 is fixed by the pressure plate 600.

[0151] like Figures 28 to 30 As shown, the rotor structure of the axial magnetic field motor includes:

[0152] One rotor core is 100;

[0153] A plurality of permanent magnets 200 are arranged at circumferential intervals. The inner surface of the permanent magnet 200 is disposed on the rotor core 100, and a permanent magnet recess 201 is formed on the outer surface of the permanent magnet 200.

[0154] At least one magnetically conductive component 700 includes a plurality of pole shoe cores 300, each permanent magnet 200 corresponds to one pole shoe core 300, each pole shoe core 300 includes a surface body 310 and two side bodies 350, the two side bodies 350 are connected to the two sides of the surface body 310 in the circumferential direction, the surface body 310 is adapted to be disposed on the outer surface of the permanent magnet 200 in the axial direction, and a surface body recess 311 adapted to the permanent magnet recess 201 is formed on the surface body 310, the claw 650 is embedded in the surface body recess 311, and the permanent magnet 200 is disposed between the two side bodies 350;

[0155] A pressure plate 600 includes an inner limiting part 620, an outer limiting part 630, and a plurality of claw parts 650. The claw parts 650 are connected between the inner limiting part 620 and the outer limiting part 630. Each claw part 650 corresponds to a permanent magnet 200 and is embedded in the surface body recess 311. The inner limiting part 620 and the outer limiting part 630 are fixed to the rotor core 100, and the permanent magnet 200 is radially limited between the inner limiting part 620 and the outer limiting part 630.

[0156] The permanent magnet 200 has a permanent magnet recess 201 on its axial outer surface to fit with the surface body recess 311 of the pole shoe core 300, and the claw 650 is disposed in the surface body recess 311. After the pressure plate 600 is fixed to the rotor core 100, the claw 650 applies force to the pole shoe core 300, and the pole shoe core 300 applies force to the permanent magnet 200, so that the permanent magnet 200 is firmly fixed to the rotor core 100. The permanent magnet 200 is axially confined between the surface body 310 and the rotor core 100, and the claw portion 650 and the surface body recess 311 cooperate to provide circumferential constraint for the permanent magnet 200. Additionally, the permanent magnet 200 is radially confined between the inner limiting portion 620 and the outer limiting portion 630, improving the accuracy of the permanent magnet 200 installation. This meets the high-speed rotation requirements of axial flux motors for electric vehicles, ensuring reliable and stable motor operation. Furthermore, the fixing method of the pressure plate 600 for the permanent magnet 200 releases the inter-pole space between adjacent permanent magnets 200, increasing the inner and outer pole arc coefficient of the permanent magnet, even to 1, thereby enhancing the motor's torque and power output capabilities.

[0157] like Figure 30 and Figure 36 As shown, the rotor core 100 includes a first core 110, which includes a mounting surface 111 and an inner boss 112. The inner boss 112 protrudes upward and connects to the radially inner side of the mounting surface 111. An inner limiting part 620 is fixed to the inner boss 112. The radially inner surface of the permanent magnet 200 abuts against the inner boss 112 and the inner limiting part 620, respectively. The radially outer surface of the permanent magnet 200 abuts against the outer limiting part 630, and the outer limiting part 630 is directly fixed to the mounting surface 111. It can be seen that the rotor core eliminates the outer boss structure, which can significantly reduce eddy current losses in the rotor core and improve motor efficiency. The first core 110 can be made of high-strength structural materials to enhance its support capacity.

[0158] Continue to refer to Figure 30 and Figure 36 The rotor core 100 also includes a second core 120. The mounting surface 111 has a plurality of mounting slots 1111, and the second core 120 is embedded in the mounting slots 1111.

[0159] like Figure 29 and Figure 36As shown, the inner boss 112 is provided with a plurality of circumferentially spaced limiting parts 1114, each of which is disposed between two adjacent permanent magnets 200, and can circumferentially limit the permanent magnets 200.

[0160] like Figures 28 to 30 , Figure 32 As shown, there is a gap between the side body 350 and the mounting surface 111, and a notch 351 is provided on the inner side of the side body 350 to avoid the limiting part 114. It can be seen that the permanent magnet 200 is circumferentially limited by the combined action of the side body 350, the claw part 650 and the limiting part 114.

[0161] like Figures 29 to 33 As shown, the permanent magnet 200 is trapezoidal, and its width gradually increases radially from the inside to the outside. The axial inner surface of the permanent magnet 200 is attached to the mounting surface 111, and the axial outer surface of the permanent magnet 200 is attached to the surface layer 310. The surface layer 310 is adapted to the shape of the permanent magnet 200, and after the surface layer 310 and the permanent magnet 200 are assembled, their outer circumferences are aligned, that is, the width of the surface layer 310 gradually increases radially from the inside to the outside.

[0162] The permanent magnet recess 201 extends through the radial inner surface and the radial outer surface of the permanent magnet 200, and the permanent magnet recess 201 is located on the center line of the permanent magnet 200. (Reference) Figure 32 and Figure 33 The surface body recess 311 is concave on the upper surface of the surface body 310, for embedding the claw portion 650 of the pressure plate 600, and the shapes of the two are compatible. The surface body recess 311 is convex on the lower surface of the surface body 310, for embedding in the permanent magnet recess 201.

[0163] As can be seen from the above, the shapes of the permanent magnet recess 201, the surface body recess 311, and the claw 650 are adapted to each other, and the depth of the permanent magnet recess 201, the depth of the surface body recess 311, and the thickness of the claw 650 can be comprehensively designed according to the requirements of electromagnetic and mechanical performance.

[0164] Continue to refer to Figures 33 to 35The inner radial surface of the permanent magnet 200 is adapted to the inner limiting portion 620, and the outer radial surface of the permanent magnet 200 is adapted to the outer limiting portion 630. For example, if the inner radial surface of the permanent magnet 200 is concave, then the surface of the inner limiting portion 620 that abuts against the permanent magnet 200 is convex; if the outer radial surface of the permanent magnet 200 is convex, then the surface of the outer limiting portion 630 that abuts against the permanent magnet 200 is concave.

[0165] The two circumferential sides of the permanent magnet 200 are adapted to the side body 350. The two circumferential sides of the permanent magnet 200 may be provided with a right-angled structure or a stepped structure respectively; and / or, the two radial sides of the permanent magnet 200 may be provided with a right-angled structure or a stepped structure respectively.

[0166] The pole shoe core 300 has several slits 3000 that penetrate the surface body 310. By providing these slits 3000, the induced eddy currents in the pole shoe core 300 are blocked, reducing their eddy current losses. Furthermore, these slits provide a conductive path for the high-order harmonic magnetic field in the air gap, significantly reducing the high-order harmonic magnetic field passing through the rotor core. This, in turn, greatly reduces eddy current losses and hysteresis losses in the rotor core.

[0167] like Figure 34 As shown, the pressure plate 600 is an integral structure, made of high-strength, low-conductivity, non-magnetic or low-magnetic-permeability material. The inner limiting part 620 and the outer limiting part 630 are annular, and a plurality of claw parts 650 are arranged at circumferential intervals, and the number of claw parts 650 is the same as that of the permanent magnet 200. Figure 35 .

[0168] like Figure 28 and Figure 29 As shown, the axial magnetic field motor rotor structure also includes screws 500. The pressure plate 600 and the rotor core 100 are fixed together by screws 500. The fixing by screws 500 effectively improves the fastening effect and is particularly suitable for medium and high speed motors.

[0169] refer to Figure 34 The inner limiting part 620 has several inner holes 621, and the screw 500 passes through the inner holes 621 and is screwed to the first iron core 110 of the rotor iron core 100; the outer limiting part 630 has several outer holes 631, and the screw 500 passes through the outer holes 631 and is screwed to the first iron core 110 of the rotor iron core 100, so as to fix the pressure plate 600 and the rotor iron core 100.

[0170] refer to Figure 36The first iron core 110 has an internally threaded hole 1121 corresponding to the inner hole 621. The screw 500 passes through the inner hole 621 and is screwed into the internally threaded hole 1121 to fix the pressure plate 600 and the rotor core 100. Similarly, the first iron core 110 also has an externally threaded hole 1131 corresponding to the outer hole 631.

[0171] Continue to refer to Figure 30 and Figure 34 The inner hole 621 and the outer hole 631 are opposite each other and located in the middle of two adjacent claw portions 650. The screw size passing through the inner hole 621 is larger than the screw size passing through the outer hole 631. Since the two adjacent permanent magnets 200 are not blocked by the pressure plate 600, the inner limiting portion 620 can protrude towards the outer limiting portion 630 to form a semi-circular portion 622 for opening the inner hole 621.

[0172] like Figure 36 As shown, the external threaded hole 1131 is formed on the mounting surface 111, and the internal threaded hole 1121 is formed on the limiting portion 114. (Reference) Figure 21 and Figure 22 The outer surface of the inner limiting part 620 is flush with the outer surface of the inner protrusion 112. The semicircular part 622 is disposed on the outer surface of the inner limiting part 620, and the semicircular part 622 and the limiting part 114 correspond one-to-one. Each semicircular part 622 is fixed on one of the limiting parts 114.

[0173] The pole shoe core 300 is made of a material with high magnetic permeability, high strength, and low electrical conductivity to meet the magnetic permeability requirements.

[0174] Within the rotor range, the difference between the Q-axis and D-axis in their magnetic transmission paths is as follows: the Q-axis magnetic transmission path runs between adjacent permanent magnets 200, while the D-axis magnetic transmission path runs along the permanent magnets 200, the surface body 310, and the claw portion 650. Since the surface body 310 uses a high-permeability material with a permeability much greater than that of air, while the permeability of the permanent magnets 200 is comparable to that of air, and the claw portion 650 uses a non-magnetic or low-permeability material, and the interpole space between the permanent magnets 200 is air, the magnetic reluctance is greater on the Q-axis magnetic transmission path and smaller on the D-axis magnetic transmission path, i.e., L... q <L d Therefore, the salient pole ratio ρ = L q / L d <1, meaning that a rotor structure with a salient pole ratio of less than 1 is designed.

[0175] The assembly method of the rotor structure of the axial magnetic field motor is as follows:

[0176] A plurality of permanent magnets 200 are placed on the rotor core 100, and the plurality of permanent magnets 200 are arranged at circumferential intervals.

[0177] A pole shoe core 300 is placed on the surface of each permanent magnet 200. The surface recess 311 of the pole shoe core 300 is adapted to be disposed within the permanent magnet recess 201 of the permanent magnet 200.

[0178] The pressure plate 600 is fixed to the rotor core 100, and the claw portion 650 of the pressure plate 600 is embedded in the surface body recess 311 to fix the permanent magnet 200 and the pole shoe core 300 as a whole.

[0179] In summary, by adding the pole shoe core 300 between the permanent magnet 200 and the pressure plate 600, and by providing a gap 3000 on the pole shoe core, eddy current losses can be reduced. Simultaneously, the material of the pole shoe core meets magnetic conductivity requirements, improving motor efficiency and enhancing the safety and reliability of the permanent magnet operation. Furthermore, the pole shoe core 300 allows for the design of a rotor structure with a saliency ratio less than 1, which is beneficial for improving the motor's field weakening and speed-enhancing capabilities.

[0180] Sixth Embodiment

[0181] like Figures 37 to 44 As shown, in the axial magnetic field motor rotor structure of the sixth embodiment, the pole shoe core 300 is fixed by a pressure plate 600. Specifically, the axial magnetic field motor rotor structure includes:

[0182] One rotor core is 100;

[0183] A plurality of permanent magnets 200 are arranged circumferentially on the rotor core 100;

[0184] At least one magnetically conductive component 700, the magnetically conductive component 700 including a plurality of pole shoe cores 300, each of the permanent magnets 200 corresponding to one of the pole shoe cores 300, the permanent magnets 200 being confined on the rotor core 100 by the pole shoe cores 300;

[0185] A pressure plate 600 is fixed to the rotor core 100 to fix the pole shoe core 300 on the surface of the permanent magnet 200.

[0186] The permanent magnet 200 is confined on the rotor core 100 by the pole shoe core 300, and the pole shoe core 300 is fixed by the pressure plate 600, so that the permanent magnet 200 is firmly fixed on the rotor core 100, improving the accuracy of the installation of the permanent magnet 200. This meets the high-speed rotation requirements of axial flux motors for electric vehicles and ensures the reliability and stability of motor operation. In addition, the pole shoe core 300 can be used to design a rotor structure with a saliency ratio of less than 1.

[0187] like Figure 38 and Figure 44 As shown, the rotor core 100 includes a first core 110, which has a mounting surface 111. The permanent magnet 200 and the pressure plate 600 are fixed to the mounting surface 111. Both the permanent magnet 200 and the pressure plate 600 are disposed on the mounting surface 111, and the first core 110 eliminates the boss structure, which can significantly reduce losses on the rotor core and improve motor efficiency.

[0188] Continue to refer to Figure 38 and Figure 44 The rotor core 100 also includes a second core 120. The mounting surface 111 has a plurality of mounting slots 1111, and the second core 120 is embedded in the mounting slots 1111.

[0189] like Figures 38 to 41 As shown, the permanent magnet 200 is trapezoidal, and its width gradually increases radially from the inside to the outside. The axial inner surface of the permanent magnet 200 is attached to the mounting surface 111, the axial outer surface of the permanent magnet 200 and the two circumferential sides of the permanent magnet 200 are attached to the pole shoe core 300, and the two radial sides of the permanent magnet 200 are attached to the pressure plate 600.

[0190] like Figure 40 and Figure 41 As shown, the pole shoe core 300 includes a surface body 310 and two side bodies 350. The two side bodies 350 are connected to both sides of the surface body 310 in the circumferential direction. The permanent magnet 200 is axially limited between the surface body 310 and the rotor core 100, and the permanent magnet 200 is circumferentially limited between the two side bodies 350.

[0191] The surface layer 310 is adapted to the shape of the permanent magnet 200, and after the surface layer 310 and the permanent magnet 200 are assembled, their outer circumferences are aligned. The axial inner surface of the permanent magnet 200 abuts against the mounting surface 111 of the rotor core 100, and the axial outer surface of the permanent magnet 200 abuts against the surface layer 310, that is, the permanent magnet 200 is axially confined between the rotor core 100 and the surface layer 310.

[0192] refer to Figure 40 The pole shoe core 300 has several slits 3000 that penetrate the surface body 310. By providing these slits 3000, the induced eddy currents in the pole shoe core 300 are blocked, reducing eddy current losses. Furthermore, these slits provide a conductive path for the high-order harmonic magnetic field in the air gap, significantly reducing the high-order harmonic magnetic field passing through the rotor core. This greatly reduces eddy current losses and hysteresis losses in the rotor core.

[0193] like Figure 42 As shown, the pressure plate 600 includes a base plate portion 610, an inner limiting portion 620, an outer limiting portion 630, and a plurality of inter-element limiting portions 640. The inner limiting portion 620 is connected to the radially inner side of the base plate portion 610, the outer limiting portion 630 is connected to the radially outer side of the base plate portion 610, and the inter-element limiting portions 640 are connected to the base plate portion 610 and are connected between the inner limiting portion 620 and the outer limiting portion 630.

[0194] An inter-pole limiting part 640 is provided between two adjacent side bodies 350 located in different pole shoe cores 300. The surface body 310 of the pole shoe core 300 is disposed between the base plate part 610 and the permanent magnet 200. The permanent magnet 200 is radially limited between the inner limiting part 620 and the outer limiting part 630.

[0195] A plurality of the inter-pole limiting portions 640 are arranged circumferentially, and a groove 6000 is formed between two adjacent inter-pole limiting portions 640 for accommodating the permanent magnet 200 on the surface of the pole shoe core 300. The two circumferential sides of the permanent magnet 200 abut against the inter-pole limiting portions 640 through the side bodies 350, so that the inter-pole limiting portions 640 directly apply force to the pole shoe core 300, and the pole shoe core 300 directly applies force to the permanent magnet 200, thereby constraining the permanent magnet 200 axially and circumferentially.

[0196] Furthermore, the radial inner surface of the permanent magnet 200 is attached to the inner limiting part 620, and the radial outer surface of the permanent magnet 200 is attached to the outer limiting part 630, so that the permanent magnet 200 is radially limited between the inner limiting part 620 and the outer limiting part 630, thereby constraining the permanent magnet 200 and preventing it from shifting or deforming due to centrifugal force at high speeds. Further, the radial inner surface of the permanent magnet 200 is concave and is attached to the inner limiting part 620, while the radial outer surface of the permanent magnet 200 is convex and is attached to the outer limiting part 630.

[0197] like Figures 38 to 41 As shown, the permanent magnet 200 is trapezoidal, and the width of the permanent magnet 200 gradually increases radially from the inside to the outside. The inter-pole limiting part 640 is also trapezoidal, and the width of the inter-pole limiting part 640 gradually decreases radially from the inside to the outside, so as to be adapted to be installed between two adjacent permanent magnets 200. The side body 350 abuts between the permanent magnet 200 and the inter-pole limiting part 640.

[0198] As described above, the circumferential side surface of the side body 350, the circumferential side surface of the permanent magnet 200, and the circumferential side surface of the inter-pole limiting part 640 are adapted to each other; the radial inner side surface of the permanent magnet 200 is adapted to the inner limiting part 620; and the radial outer side surface of the permanent magnet 200 is adapted to the outer limiting part 630. The two circumferential side surfaces of the permanent magnet 200 are respectively provided with a chamfered right-angle structure or a stepped structure; and / or, the two radial side surfaces of the permanent magnet 200 are respectively provided with a chamfered right-angle structure or a stepped structure.

[0199] The pressure plate 600 is made of carbon fiber composite material to enhance its mechanical strength. Furthermore, the pressure plate 600 is a monolithic structure to improve assembly efficiency.

[0200] like Figure 37 and Figure 38 As shown, the axial magnetic field motor rotor structure also includes several screws 500. The pressure plate 600 and the rotor core 100 are fixed together by the screws 500. The fixing by the screws 500 effectively improves the fastening effect and is particularly suitable for medium and high speed motors.

[0201] refer to Figure 42 and Figure 44The inner limiting part 620 has several inner holes 621, and the first iron core 110 has an internally threaded hole 1121 opposite to the inner holes 621. The screw 500 passes through the inner holes 621 and is screwed into the internally threaded hole 11121 of the first iron core 110. The outer limiting part 630 has several outer holes 631, and the first iron core 110 has an externally threaded hole 11131 opposite to the outer holes 631. The screw 500 passes through the outer holes 631 and is screwed into the externally threaded hole 1131 of the first iron core 110, thereby fixing the pressure plate 600 and the first iron core 110.

[0202] refer to Figure 42 The inner hole 621 and the outer hole 631 are staggered circumferentially. The inner hole 621 is located in the middle of the two inter-pole limiting parts 640. The outer hole 631 and the inter-pole limiting parts 640 are arranged opposite each other to make the connection force points uniform and improve the fixing effect of the pressure plate 600 and the rotor core 100.

[0203] The pole shoe core 300 is made of a material with high magnetic permeability, high strength, and low electrical conductivity to meet the magnetic permeability requirements.

[0204] Within the rotor range, the difference between the Q-axis and D-axis in their magnetic transmission paths is as follows: the Q-axis magnetic transmission path runs along the inter-pole limiting portion 640, while the D-axis magnetic transmission path runs along the permanent magnet 200, the surface layer 310, and the base plate 610. Because the surface layer 310 uses a high-permeability material, its magnetic permeability is much greater than that of air and the carbon fiber composite material used in the inter-pole limiting portion 640. Therefore, the magnetic reluctance is greater on the Q-axis magnetic transmission path and smaller on the D-axis magnetic transmission path, i.e., L... q <L d Therefore, the salient pole ratio ρ = L q / L d <1, meaning that a rotor structure with a salient pole ratio of less than 1 is designed.

[0205] The assembly method of the rotor structure of the axial magnetic field motor is as follows:

[0206] A plurality of permanent magnets 200 are placed on the rotor core 100, and the plurality of permanent magnets 200 are arranged at circumferential intervals.

[0207] The pole shoe cores 300 are placed one by one on the surface of each of the permanent magnets 200. The permanent magnets 200 are axially confined between the rotor core 100 and the surface body 310 of the pole shoe cores 300, and circumferentially confined between the two side bodies 350 of the pole shoe cores 300.

[0208] The pressure plate 600 is fixed on the rotor core 100, and the permanent magnet 200, on which the pole shoe core 300 is placed, is accommodated within the groove 6000 of the pressure plate 600. The permanent magnet 200 is radially limited between the inner limiting portion 620 and the outer limiting portion 630 of the pressure plate 600.

[0209] Alternatively, the pressure plate 600 can be inverted first to expose the grooves 6000 of the pressure plate 600, and then the pole shoe core 300 and the permanent magnet 200 can be placed in each of the grooves 6000 in sequence. Finally, the rotor core 100 can be fixed to the pressure plate 600.

[0210] In summary, the permanent magnet 200 is confined to the rotor core 100 by the pole shoe core 300, and the pole shoe core 300 is fixed by the pressure plate 600 and completely covered by the pressure plate 600. This ensures the permanent magnet 200 is firmly attached to the rotor core 100, improving the accuracy of the permanent magnet 200 installation. This meets the high-speed rotation requirements of axial flux motors for electric vehicles, ensuring reliable and stable motor operation. Furthermore, the pole shoe core 300 has a gap 3000, which reduces eddy current losses. Its material also meets magnetic conductivity requirements, improving motor efficiency and enhancing the safety and reliability of the permanent magnet operation. Additionally, the pole shoe core 300 allows for the design of a rotor structure with a saliency ratio of less than 1.

[0211] Seventh Embodiment

[0212] like Figures 45 to 49 As shown, the axial magnetic field motor rotor structure of the seventh embodiment differs from that of the sixth embodiment in that the shape of the pressure plate 600 is different.

[0213] like Figure 47 and Figure 48 As shown, the pressure plate 600 includes an inner limiting part 620, an outer limiting part 630, and a plurality of inter-pole limiting parts 640. The inter-pole limiting parts 640 are connected between the inner limiting part and the outer limiting part, and the plurality of inter-pole limiting parts 640 are arranged at circumferential intervals. An inter-pole limiting part 640 is provided between two adjacent pole shoe cores 300. The inner limiting part 620 and the outer limiting part 630 are fixed on the rotor core 100, and the permanent magnet 200 is radially limited between the inner limiting part 620 and the outer limiting part 630.

[0214] After the pressure plate 600 is fixed on the rotor core 100, the inter-pole limiting part 640 applies force to the pole shoe core 300, and the pole shoe core 300 applies force to the permanent magnet 200, thereby constraining the permanent magnet 200 in both circumferential and axial directions.

[0215] like Figure 46 and Figure 47 As shown, the width of the permanent magnet 200 gradually increases radially from the inside to the outside, while the width of the inter-pole limiting portion 640 gradually decreases radially from the inside to the outside, to adapt for installation between two adjacent permanent magnets 200. The two circumferential sides of the permanent magnet 200, the side body 350, and the two circumferential sides of the inter-pole limiting portion 640 are adapted to each other, and can be respectively provided with chamfered right-angle structures or stepped structures, etc.

[0216] like Figure 46 , Figure 48 and Figure 49 As shown, the inner limiting part 620 has a plurality of inner holes 621, and the first iron core 110 has an internal threaded hole 1121 opposite to the inner holes 621. The screw 500 passes through the inner holes 621 and is screwed into the internal threaded hole 1121 of the first iron core 110. The outer limiting part 630 has a plurality of outer holes 631, and the first iron core 110 has an external threaded hole 1131 opposite to the outer holes 631. The screw 500 passes through the outer holes 631 and is screwed into the external threaded hole 1131 of the first iron core 110 to fix the pressure plate 600 and the first iron core 110.

[0217] refer to Figure 47 The inner hole 621 and the outer hole 631 are staggered circumferentially. The inner hole 621 is located in the middle of the two inter-pole limiting parts 640. The outer hole 631 and the inter-pole limiting parts 640 are arranged opposite each other to make the connection force points uniform and improve the fixing effect of the pressure plate 600 and the rotor core 100.

[0218] Continue to refer to Figure 48 and Figure 49 The inter-pole limiting part 640 has a central hole 641, and the first iron core 110 has a central threaded hole 1141 opposite to the central hole 641. In this way, the screw 500 passes through the central hole 641 and is screwed into the central threaded hole 1141, further strengthening the fixation of the pressure plate 600 and the rotor iron core 100.

[0219] Since the permanent magnet 200 is disposed between two adjacent inter-pole limiting portions 640, the inner limiting portion 620 can protrude inward to form a semi-circular portion 622 for opening the inner hole 621.

[0220] The pressure plate 600 may be made of carbon fiber composite material to enhance its mechanical strength requirements.

[0221] Within the rotor range, the difference between the Q-axis and D-axis in their magnetic transmission paths is as follows: the Q-axis magnetic transmission path is along the inter-pole limiting portion 640, and the D-axis magnetic transmission path is along the permanent magnet 200 and the surface body 310. Since the surface body 310 uses a high-permeability material, its magnetic permeability is much greater than that of air and the carbon fiber composite material used in the inter-pole limiting portion 640. Therefore, the magnetic reluctance is greater along the Q-axis magnetic transmission path and smaller along the D-axis magnetic transmission path, i.e., L... q <L d Therefore, the salient pole ratio ρ = L q / L d <1, meaning that a rotor structure with a salient pole ratio of less than 1 is designed.

[0222] The assembly method of the rotor structure of the axial magnetic field motor is as follows:

[0223] A plurality of permanent magnets 200 are placed on the rotor core 100, and the plurality of permanent magnets 200 are arranged at circumferential intervals.

[0224] The pole shoe cores 300 are placed one by one on the surface of each of the permanent magnets 200. The permanent magnets 200 are axially confined between the rotor core 100 and the surface body 310 of the pole shoe cores 300, and circumferentially confined between the two side bodies 350 of the pole shoe cores 300.

[0225] The pressure plate 600 is fixed on the rotor core 100, and the pole shoe cores 300 of the pressure plate 600 are limited to the two adjacent pole shoe cores 300, and the permanent magnet 200 is radially limited between the inner limiting part 620 and the outer limiting part 630 of the pressure plate 600.

[0226] In summary, the permanent magnet 200 is confined to the rotor core 100 by the pole shoe core 300, and the pole shoe core 300 is fixed by the pressure plate 600, thereby ensuring the permanent magnet 200 is firmly attached to the rotor core 100, improving the accuracy of the permanent magnet 200 installation, and guaranteeing the reliability and stability of the motor operation. Furthermore, the surface layer 310 of the pole shoe core 300 is exposed by the pressure plate 600.

[0227] Eighth embodiment

[0228] like Figures 50 to 54 As shown, the axial magnetic field motor of the eighth embodiment differs from that of the first embodiment in the shape of the pole shoe core 300. (See reference...) Figure 52 and Figure 53 As shown, the outer surface of the interphase 320 in the axial direction is flush with the outer surface of the surface layer 310 in the axial direction, and the axial dimension of the surface layer 310 is smaller than the axial dimension of the interphase 320.

[0229] The axial dimension of the interpole body 320 is larger than that of the surface body 310, but smaller than the sum of the axial dimensions of the permanent magnet 200 and the surface body 310. Since the interpole body 320 and the surface body 310 are made of highly permeable materials, their permeability is much greater than that of air, while the permeability of the permanent magnet 200 is comparable to that of air. Therefore, the magnetic reluctance is lower along the Q-axis magnetic path and higher along the D-axis magnetic path, i.e., L... q >L d Therefore, the salient pole ratio ρ = L q / L d >1, meaning that a rotor structure with a salient pole ratio greater than 1 is designed.

[0230] The radially outer sides of the surface layer 310 and the radially outer sides of the inter-electrode body 320 are flush to form a continuous annular outer edge. The radially inner side of the inter-electrode body 320 is recessed relative to the radially inner side of the surface layer 310, thus avoiding the positioning portion 114. (See [reference]) Figures 51 to 55 This is to arrange a limiting part 114 and an interpole body 320 between two adjacent permanent magnets 200, so as to improve the ability to limit the permanent magnets 200 circumferentially.

[0231] refer to Figure 51 and Figure 52 The inter-pole body 320 is trapezoidal, and its width gradually decreases radially from the inside to the outside, so that it fits into the gap between two adjacent permanent magnets 200. The number of permanent magnets 200 is the number of motor poles, and the number of inter-pole bodies 320 is equal to the number of permanent magnets 200, for example, both the number of inter-pole bodies 320 and the number of permanent magnets 200 are 12.

[0232] like Figure 52 and Figure 53 As shown, the pole shoe core 300 has a plurality of slits 3000. The slits 3000 are located on the outer surface of the pole shoe core 300 in the axial direction. The slits 3000 penetrate the surface body 310, and the depth of the slits 3000 on the inter-pole body 320 is greater than the thickness of the surface body 310.

[0233] In addition, an air gap is reserved between the inner surface of the pole piece 320 in the axial direction and the rotor core 100 to reduce the eddy current loss of the pole piece core and to prevent a significant increase in the Q-axis magnetic reluctance.

[0234] like Figure 52 and Figure 53As shown, the inter-pole body 320 has a plurality of screw holes 3211, so that the screws 500 pass through the screw holes 3211 and are screwed onto the first iron core 110, thereby fixing the pole shoe iron core 300 and the first iron core 110. (Refer to...) Figure 51 .

[0235] Ninth Embodiment

[0236] like Figures 55 to 59 As shown, the axial magnetic field motor rotor structure of the ninth embodiment differs from that of the eighth embodiment in that the axial magnetic field motor rotor structure further includes a baffle 400, which is disposed between the permanent magnet 200 and the interpole body 320, effectively reducing interpole leakage magnetic field, improving the utilization rate of the permanent magnet magnetic field, improving torque output and power output capability, and reducing eddy current loss of the pole shoe core.

[0237] The baffle 400 can be made of a non-magnetic or low-magnetic-permeability, low-electrical-permeability but with a certain mechanical strength. The pole shoe core 300 directly applies force to the baffle 400, and the baffle 400 then applies force to the permanent magnet 200, thereby fixing and constraining the permanent magnet 200 in the circumferential and axial directions.

[0238] like Figures 56 to 59 As shown, baffles 400 are respectively provided on both circumferential sides of the permanent magnet 200, and it can be seen that the number of baffles 400 is twice the number of permanent magnets 200. Figure 58 and Figure 59 As shown, the baffle 400 is adapted to the side shape of the permanent magnet 200 on both sides of the circumference. When the baffle 400 is disposed between the permanent magnet 200 and the interpole body 320, the outer peripheries of the three are aligned.

[0239] Taking the permanent magnet 200 with a chamfered right angle structure on its circumferential side as an example, the baffle 400 includes a baffle inclined surface 410 and a baffle plane 420 that are connected from top to bottom. The baffle inclined surface 410 abuts against the first surface 210, and the baffle plane 420 abuts against the second surface 220, so as to achieve the alignment of the outer periphery of the two and satisfy the axial and axial limiting constraint capabilities.

Claims

1. A rotor structure for an axial magnetic field motor, characterized in that, The device includes a rotor core (100), a plurality of permanent magnets (200), and at least one magnetic conductive assembly (700). The plurality of permanent magnets (200) are arranged at circumferential intervals. The axial inner surface of the permanent magnets (200) is disposed on the rotor core (100). The magnetic conductive assembly (700) covers the axial outer surface of the permanent magnets (200) and the two circumferential sides of the permanent magnets (200) to confine the permanent magnets (200) on the rotor core (100). The magnetic conductive assembly (700) includes a pole shoe core (300), which includes a plurality of surface bodies (310) and a plurality of inter-pole bodies (320). The surface bodies (310) and the inter-pole bodies (320) are alternately connected to form an annular and integral pole shoe core (300). The inter-pole body (320) includes an inter-pole base plate (321) and two inter-pole side plates (322). The inter-pole base plate (321) is located between two adjacent permanent magnets (200) and is fixed to the rotor core (100). The inter-pole side plates (322) are connected between the inter-pole base plate (321) and the surface body (310), and the inter-pole side plates (322) and the circumferential side surfaces of the permanent magnets (200) abut against each other. The thickness of the inter-pole base plate (321) is equal to the thickness of the surface body (310).

2. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, The upper surface of the permanent magnet (200) is completely covered by the magnetic conductive component (700).

3. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, The permanent magnet (200) is axially confined between the surface body (310) and the rotor core (100), and the permanent magnet (200) is circumferentially confined between two adjacent interpole bodies (320).

4. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, The thickness of the magnetic conductive assembly (700) located on the surface of the permanent magnet (200) is equal to the thickness of the magnetic conductive assembly (700) located between adjacent permanent magnets (200).

5. The axial magnetic field motor rotor structure as described in claim 3, characterized in that, The thickness of the inter-pole body (320) is greater than the thickness of the surface body (310). The outer surface of the inter-pole body (320) in the axial direction is flush with the outer surface of the surface body (310) in the axial direction. An air gap is reserved between the inner surface of the inter-pole body (320) in the axial direction and the rotor core (100).

6. The axial magnetic field motor rotor structure as described in claim 3, characterized in that, It also includes a baffle (400) disposed between the permanent magnet (200) and the interpole (320).

7. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, The magnetic conductive assembly (700) includes a plurality of pole shoe cores (300). Each permanent magnet (200) is fixed to the rotor core (100) by a pole shoe core (300). The pole shoe core (300) includes a surface body (310) and two side bodies (350). The two side bodies (350) are respectively connected to the two circumferential sides of the surface body (310). The permanent magnet (200) is axially limited between the surface body (310) and the rotor core (100), and circumferentially limited between the two side bodies (350).

8. The axial magnetic field motor rotor structure as described in claim 7, characterized in that, The pole shoe core (300) further includes an inner body (330) and an outer body (340). The inner body (330) is connected to the radial inner side of the surface body (310), and the outer body (340) is connected to the radial outer side of the surface body (310). The inner body (330) and the outer body (340) are fixed on the rotor core (100), and the permanent magnet is radially limited between the inner body (330) and the outer body (340).

9. The axial magnetic field motor rotor structure as described in claim 7, characterized in that, It also includes a pressure plate (600) fixed on the rotor core (100) to fix the pole shoe core (300) disposed on the axial outer surface of the permanent magnet (200).

10. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, The permanent magnet (200) is radially confined on the rotor core (100) and / or the pole shoe core (300).

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