Axial field motor rotor structure

Abstract

The present application relates to axial magnetic field motor, especially to a kind of axial magnetic field motor rotor structure, including rotor core;Several permanent magnets, several The permanent magnets are circumferentially spaced on the rotor core;Several pole shoe cores, pole shoe core includes surface layer body, inner edge body and outer edge body, inner edge body is connected to the radial inner side of surface layer body, outer edge body is connected to the radial outer side of surface layer body, and inner edge body and outer edge body are fixed on the rotor core;Each permanent magnet is respectively positioned and fixed on the rotor core by a pole shoe core, and the surface layer body is at least partially covered on the upper surface of the permanent magnet, so that the permanent magnet can be firmly between the rotor core and the pole shoe core, while improving the accuracy of the permanent magnet installation, ensuring the reliability and stability of motor operation.

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 problems, this invention provides a method for fixing permanent magnets using pole shoe cores. These pole shoe cores not only meet the requirements for fixing permanent magnets but also for magnetic conductivity, and can reduce eddy current losses.

[0005] This invention provides an axial magnetic field motor rotor structure, comprising:

[0006] Rotor core;

[0007] A plurality of permanent magnets are arranged circumferentially on the rotor core;

[0008] A plurality of pole shoe cores, each pole shoe core comprising a surface body, an inner side body, and an outer side body, wherein the inner side body is connected to the radially inner side of the surface body, and the outer side body is connected to the radially outer side of the surface body, and the inner side body and the outer side body are fixed to the rotor core;

[0009] Each of the permanent magnets is fixed to the rotor core by a pole shoe core, and the surface body at least partially covers the upper surface of the permanent magnet.

[0010] In a preferred embodiment, the upper surface of the permanent magnet is completely covered by the surface layer.

[0011] In a preferred embodiment, the pole shoe core further includes two side bodies, which are respectively connected to the two circumferential sides of the surface body, and the permanent magnet is circumferentially confined between the two side bodies.

[0012] In a preferred embodiment, the inner body includes an inner edge portion and an inner fixing portion, the inner edge portion extending and connecting between the inner fixing portion and the outer body, and the inner fixing portion being fixed to the rotor core;

[0013] The outer body includes at least one outer edge and at least one outer fixing part, each outer edge extending and connecting between one of the outer fixing parts and the surface body, and the outer fixing part being fixed to the rotor core;

[0014] The radial limit of the permanent magnet is located between the inner edge and the outer edge.

[0015] In a preferred embodiment, the inner fixing part is provided with an inner mounting hole, and the outer fixing part is provided with an outer mounting hole.

[0016] In a preferred embodiment, two external fixing parts located on different pole shoe cores and close to each other are stacked together, and the external mounting holes of the two stacked external fixing parts are arranged opposite each other.

[0017] In a preferred embodiment, the inner fixing parts of several pole shoe cores are integrally connected and form a whole;

[0018] And / or, the outer fixing parts of several pole shoe cores are integrally connected and form a whole.

[0019] In a preferred embodiment, the pole shoe core has a plurality of slits that penetrate the surface layer.

[0020] In a preferred embodiment, the two circumferential sides of the permanent magnet are respectively provided with a right-angled structure or a stepped structure;

[0021] And / or, the two radial sides of the permanent magnet are respectively provided with a right-angled structure or a stepped structure.

[0022] In a preferred embodiment, the rotor core includes a first core, which includes a mounting surface and an inner boss. The inner boss protrudes upward and is disposed radially inside the mounting surface. An inner body is disposed on the inner boss, and an outer body is disposed on the mounting surface. A permanent magnet is disposed on the mounting surface, and the radially inner surface of the permanent magnet abuts against the inner boss and the inner body, respectively.

[0023] In a preferred embodiment, the first iron core further includes an outer boss, which protrudes upward and is disposed radially outward of the mounting surface. The outer body is disposed on the outer boss, and the radially outer surface of the permanent magnet abuts against the outer boss and the outer body, respectively.

[0024] In a preferred embodiment, the rotor core further includes a second core, and a plurality of mounting slots are provided on the mounting surface, with the second core embedded in the mounting slots.

[0025] Compared with existing technologies, this technical solution has the following advantages:

[0026] Each permanent magnet is encased by a pole shoe core and fixedly positioned on the rotor core. The radial inner surface of the permanent magnet is simultaneously limited by the inner boss and the inner side body, and the radial outer surface of the permanent magnet is simultaneously limited by the outer boss and the outer side body, or the radial outer surface of the permanent magnet is limited only by the outer side body. The permanent magnet is axially confined between the surface body and the rotor core, and circumferentially confined between the two side bodies. This ensures that the permanent magnet is securely positioned between the rotor core and the pole shoe core, while improving the accuracy of the permanent magnet installation. This meets the high-speed rotation requirements of axial flux motors for electric vehicles and ensures the reliability and stability of motor operation.

[0027] The pole shoe core has gaps to reduce eddy current losses, while its material meets the magnetic conductivity requirements, improving motor efficiency and enhancing the safety and reliability of the permanent magnet.

[0028] The pole shoe core only wraps around the permanent magnet, without involving the space between two adjacent permanent magnets, thus releasing the interpole space between adjacent permanent magnets and increasing the space available for placing the permanent magnet.

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the first embodiment of the axial magnetic field motor rotor structure described in this invention;

[0031] Figure 2 This is an exploded view of the first embodiment of the axial magnetic field motor rotor structure described in this invention;

[0032] Figure 3 This is a cross-sectional view of the first embodiment of the axial magnetic field motor rotor structure described in this invention;

[0033] Figure 4 This is a schematic diagram of the pole shoe core structure in the first embodiment of the axial magnetic field motor rotor structure of the present invention;

[0034] Figure 5 This is a perspective view of the first embodiment of the permanent magnet described in this invention;

[0035] Figure 6 This is a front view of the first embodiment of the permanent magnet described in this invention;

[0036] Figure 7 This is a front view of the second embodiment of the permanent magnet described in this invention;

[0037] Figure 8 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;

[0038] Figure 9 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;

[0039] Figure 10 This is a schematic diagram of the second embodiment of the axial magnetic field motor rotor structure described in this invention;

[0040] Figure 11 This is an exploded view of the second embodiment of the axial magnetic field motor rotor structure described in this invention;

[0041] Figure 12 This is a cross-sectional view of a second embodiment of the axial magnetic field motor rotor structure described in this invention;

[0042] Figure 13 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;

[0043] Figure 14 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;

[0044] Figure 15 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;

[0045] Figure 16 This is a schematic diagram of the third embodiment of the axial magnetic field motor rotor structure described in this invention;

[0046] Figure 17 This is an exploded view of the third embodiment of the axial magnetic field motor rotor structure described in this invention;

[0047] Figure 18 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;

[0048] Figure 19 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.

[0049] In the diagram: 100 Rotor core, 110 First core, 111 Mounting surface, 1111 Mounting groove, 112 Inner boss, 1121 Internal threaded hole, 113 Outer boss, 1131 External threaded hole, 114 Limiting part, 120 Second core, 200 Permanent magnet, 210 First surface, 220 Second surface, 230 Third surface, 240 Fourth surface, 250 Fifth surface, 300 Pole shoe core, 310 Surface body, 330 Inner side body, 331 Inner side part, 332 Inner fixing part, 333 Inner mounting hole, 340 Outer side body, 341 Outer side part, 342 Outer fixing part, 343 Outer mounting hole, 350 Side body, 351 Notch, 500 Screw, 3000 Gap. Detailed Implementation

[0050] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0051] First Embodiment

[0052] like Figures 1 to 4 As shown, the rotor structure of the axial magnetic field motor includes:

[0053] One rotor core is 100;

[0054] A plurality of permanent magnets 200 are arranged circumferentially on the rotor core 100;

[0055] A plurality of pole shoe cores 300, each pole shoe core 300 comprising a surface body 310, an inner side body 330, and an outer side body 340, wherein 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, and the inner side body 330 and the outer side body 340 are fixed to the rotor core 100;

[0056] Each of the permanent magnets 200 is fixed to the rotor core 100 by a pole shoe core 300, and the surface body 310 at least partially covers the upper surface of the permanent magnet 200.

[0057] Each of the permanent magnets 200 is enclosed by a pole shoe core 300, wherein the permanent magnet 200 is radially confined between the inner body 330 and the outer body 340, and axially confined between the surface body 310 and the rotor core 100, so 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, which can meet the high-speed rotation requirements of the axial flux motor for electric vehicles and ensure the reliability and stability of the motor operation.

[0058] like Figure 2 , Figure 3 and Figure 9 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 inside the mounting surface 111, while the outer boss 113 protrudes upward and is located radially outside the mounting surface 111. The inner body 330 is fixed to the inner boss 112, and the outer body 340 is fixed to the outer boss 113. The 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 boss 113 and the outer 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.

[0059] 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.

[0060] refer to Figure 2 and Figure 9 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 limit the permanent magnets 200 circumferentially.

[0061] like Figure 3 and Figure 9As 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.

[0062] 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.

[0063] like Figure 4 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 3 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.

[0064] like Figure 4 and Figure 8 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.

[0065] 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.

[0066] The permanent magnet 200 is radially limited between the inner edge 331 and the outer edge 341.

[0067] 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 9 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.

[0068] like Figure 4 and Figure 8 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.

[0069] 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.

[0070] like Figure 4 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.

[0071] The gap 3000 may be annular, linear or other shapes. The gap 3000 on the surface body 310 penetrates the surface body 310 and extends to the side body 350, but does not completely penetrate the side body 350.

[0072] Provided that the mechanical strength and magnetic conductivity requirements of the rotor are met, the more gaps there are and the longer the gap length, the more helpful it is to reduce eddy current losses in the pole shoes and rotor core. In addition, the width of the gap 3000 should not be greater than 20% of the radial dimension of the permanent magnet 200, which can significantly reduce the eddy current losses of the pole shoe core 300, while preventing the pole shoe core 300 from becoming oversaturated.

[0073] like Figures 2 to 5 As 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, meaning that the upper surface of the permanent magnet 200 is completely covered by the surface body 310. 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.

[0074] The radial inner surface of the permanent magnet 200 is concave and fits against the inner boss 112 and the inner edge 331. The radial outer surface of the permanent magnet 200 is convex and fits against the outer boss 113 and the outer edge 341. The two circumferential sides of the permanent magnet 200 abut against the side body 350.

[0075] It can be seen that the two circumferential sides of the permanent magnet 200 are respectively adapted to the side body 350, the radial inner sides of the permanent magnet 200 are respectively adapted to the inner boss 112 and the inner edge 331, and the radial outer sides of the permanent magnet 200 are respectively adapted to the outer boss 113 and the outer edge 341. The two circumferential sides of the permanent magnet 200 are respectively provided with a chamfered right-angle structure or a stepped structure; and / or, the two radial sides of the permanent magnet 200 are respectively provided with a chamfered right-angle structure or a stepped structure.

[0076] Taking the two circumferential sides of the permanent magnet 200 as examples, the chamfered right-angle structure and the stepped structure are introduced:

[0077] refer to Figure 6The permanent magnet 200 has two circumferentially connected side surfaces, each including 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, and 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 axial surface and the inner axial surface 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 connected side surfaces of the permanent magnet 200 form a right-angled structure.

[0078] refer to Figure 7 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.

[0079] 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.

[0080] By designing L q and L d Different salient pole ratios can be obtained, and the formula for calculating the salient pole ratio is:

[0081] ρ=L q / L d

[0082] ρ is the salient pole ratio, L q For Q-axis inductance, L d For the D-axis inductance, L q and L dThe 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 between adjacent permanent magnets 200, while the D-axis magnetic 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 along the Q-axis magnetic path and smaller 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 of less than 1 is designed.

[0083] The assembly method of the rotor structure of the axial magnetic field motor is as follows:

[0084] 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.

[0085] 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.

[0086] 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.

[0087] Second Embodiment

[0088] refer to Figures 10 to 15 The axial magnetic field motor of the second embodiment differs from that of the first embodiment in the structure of the pole shoe core 300 and the first core 110.

[0089] like Figure 11 , Figure 12 and Figure 15 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 disposed radially inside the mounting surface 111. The inner body 330 is fixed on the inner boss 112, and the outer body 340 is fixed on the mounting surface 111. The 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.

[0090] Compared to the first embodiment, the first core 110 in the second embodiment omits the outer boss 113 found in the first embodiment. See [link to second embodiment]. Figure 9 This can significantly reduce losses on the rotor core and improve motor efficiency.

[0091] like Figure 13and Figure 14 As 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.

[0092] refer to Figure 13 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 11 .

[0093] like Figure 15 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 11 , Figure 13 and Figure 15 .

[0094] Third Embodiment

[0095] refer to Figures 16 to 19 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.

[0096] like Figures 16 to 18 As shown, the inner fixing parts 332 of a plurality of pole shoe cores 300 are integrally connected to form a whole; and / or, the outer fixing parts 342 of a plurality of pole shoe cores 300 are integrally connected to form a whole.

[0097] 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.

[0098] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. A rotor structure for an axial magnetic field motor, characterized in that, include: Rotor core (100); A plurality of permanent magnets (200) are arranged circumferentially on the rotor core (100); A plurality of pole shoe cores (300) are provided, each pole shoe core (300) comprising a surface body (310), 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). Each of the permanent magnets (200) is fixed to the rotor core (100) by a pole shoe core (300), and the surface body (310) at least partially covers the upper surface of the permanent magnet (200).

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 surface body (310).

3. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, The pole shoe core (300) also includes two side bodies (350), which are respectively connected to the two circumferential sides of the surface body (310), and the permanent magnet (200) is circumferentially limited between the two side bodies (350).

4. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, 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 outer body (310), and the inner fixing portion (332) is fixed to the rotor core (100); The outer body (340) includes at least one outer portion (341) and at least one outer fixing portion (342), each of the outer portions (341) extending and connecting between one of the outer fixing portions (342) and the surface body (310), and the outer fixing portion (342) being fixed to the rotor core (100); The permanent magnet (200) is radially limited between the inner edge (331) and the outer edge (341).

5. The axial magnetic field motor rotor structure as described in claim 4, characterized in that, The inner fixing part (332) is provided with an inner mounting hole (333), and the outer fixing part (342) is provided with an outer mounting hole (343).

6. The axial magnetic field motor rotor structure as described in claim 4, characterized in that, Two external fixing parts (342) located on different pole shoe cores (300) and close to each other are stacked together, and the external mounting holes (343) of the two stacked external fixing parts (342) are arranged opposite to each other.

7. The axial magnetic field motor rotor structure as described in claim 4, characterized in that, The inner fixing part (332) of several pole shoe iron cores (300) is integrally connected and forms a whole; And / or, the outer fixing parts (342) of several pole shoe cores (300) are integrally connected and form a whole.

8. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, The pole shoe core (300) has a plurality of slits (3000) that penetrate the surface body (310).

9. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, The permanent magnet (200) has a right-angled structure or a stepped structure on its two circumferential sides; And / or, the two radial sides of the permanent magnet (200) are respectively provided with a right-angled structure or a stepped structure.

10. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, 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 disposed on the radial inner side of the mounting surface (111). The inner side body (330) is disposed on the inner boss (112), and the outer side body (340) is disposed on the mounting surface (111). The permanent magnet (200) is disposed on the mounting surface (111), and the radial inner side of the permanent magnet (200) abuts against the inner boss (112) and the inner side body (330) respectively.

11. The axial magnetic field motor rotor structure as described in claim 10, characterized in that, The first iron core (110) also includes an outer boss (113), which is raised upward and disposed on the radial outer side of the mounting surface (111). The outer body (340) is disposed on the outer boss (113), and the radial outer side of the permanent magnet (200) abuts against the outer boss (113) and the outer body (340) respectively.

12. The axial magnetic field motor rotor structure as described in claim 10, characterized in that, The rotor core (100) also includes a second core (120), and a plurality of mounting slots (1111) are provided on the mounting surface (111), and the second core (120) is embedded in the mounting slots (1111).

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