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, at least one magnetic conducting assembly, the permanent magnets are limited on the rotor core through the magnetic conducting assembly, and the plurality of permanent magnets are arranged in a circle and are spaced apart, the thickness of the magnetic conducting assembly on the surface of the permanent magnet is greater than the thickness of the magnetic conducting assembly between adjacent permanent magnets, a rotor structure with a saliency ratio less than 1 is obtained, the permanent magnet can be stably arranged between the rotor core and a pole shoe core, the accuracy of the installation of the permanent magnet is improved, and the reliability and stability of the motor operation are ensured.

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 it. The accuracy of the permanent magnets' mounting position directly affects the performance of an axial 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, causing heat and affecting motor performance. Furthermore, the saliency ratio affects the motor's torque and power. Currently, due to the requirements for permanent magnet fixation and saliency ratio design, rotors have many components, making their structure complex and impacting their application prospects. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides an axial magnetic field motor rotor structure that fixes the permanent magnet using a pole shoe core while simultaneously meeting the design requirement of a salient pole ratio of less than 1. The pole shoe core satisfies the requirements for fixing the permanent magnet, as well as the magnetic conductivity requirement, and also reduces its eddy current losses. Furthermore, it has fewer components and effectively reduces assembly steps.

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

[0006] Rotor core;

[0007] Several permanent magnets;

[0008] At least one magnetic guiding component, wherein the permanent magnet is confined on the rotor core by the magnetic guiding component, and a plurality of the permanent magnets are arranged at circumferential intervals;

[0009] The thickness of the magnetic conductive component located on the surface of the permanent magnet is greater than the thickness of the magnetic conductive component located between adjacent permanent magnets.

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

[0011] In a preferred embodiment, the magnetically conductive component includes:

[0012] A plurality of pole shoe cores are provided. 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.

[0013] 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.

[0014] 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;

[0015] The outer body includes at least one outer edge portion and at least one outer fixing portion, each outer edge portion extending and connecting between one of the outer fixing portions and the surface body, and the outer fixing portion being fixed to the rotor core;

[0016] The radial limit of the permanent magnet is located between the inner edge and the outer edge.

[0017] 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.

[0018] In a preferred embodiment, the inner fixing parts of several pole shoe cores are integrally connected and form a whole;

[0019] And / or, the outer fixing parts of several pole shoe cores are integrally connected and form a whole.

[0020] 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.

[0021] In a preferred embodiment, a permanent magnet recess is formed on the outer surface of the permanent magnet along the axial direction, and the surface body is adapted to be disposed on the upper surface of the permanent magnet along the axial direction, and a surface body recess adapted to the permanent magnet recess is formed on the surface body.

[0022] The pressure plate includes an inner limiting part, an outer limiting part, and several claw parts. The claw parts are connected between the inner limiting part and the outer limiting part. Each claw part corresponds to a permanent magnet and is embedded in the surface body recess. The inner limiting part and the outer limiting part are fixed to the rotor core, and the permanent magnet is radially limited between the inner limiting part and the outer limiting part.

[0023] In a preferred embodiment, the pressure plate includes a base plate, an inner limiting part, an outer limiting part, and a plurality of inter-element limiting parts. The inner limiting part is connected to the radially inner side of the base plate, the outer limiting part is connected to the radially outer side of the base plate, the inter-element limiting parts are connected to the base plate, and the inter-element limiting parts are connected between the inner limiting part and the outer limiting part.

[0024] An inter-pole limiting part is provided between two side bodies located close to each other in different pole shoe iron cores. The surface body of the pole shoe iron core is provided between the base plate and the permanent magnet. The permanent magnet is radially limited between the inner limiting part and the outer limiting part.

[0025] In a preferred embodiment, the pressure plate includes an inner limiting part, an outer limiting part, and an inter-polar limiting part, wherein the inter-polar limiting part is connected between the inner limiting part and the outer limiting part;

[0026] The inner limiting part and the outer limiting part are fixed on the rotor core. An inter-pole limiting part is provided between two adjacent side bodies located on different pole shoe cores. The permanent magnet is radially limited between the inner limiting part and the outer limiting part.

[0027] Compared with existing technologies, this technical solution has the following advantages:

[0028] The permanent magnet is fixed to the rotor core using the magnetic guide assembly. Utilizing the magnetic properties of the magnetic guide assembly, and with the thickness of the magnetic guide assembly on the surface of the permanent magnet being greater than the thickness of the magnetic guide assembly between adjacent permanent magnets, a rotor structure with a saliency ratio of less than 1 is obtained. The magnetic guide assembly can be fixed using screws or a pressure plate. When fixed with screws, the magnetic guide assembly limits the position of the permanent magnet; when fixed with a pressure plate, the magnetic guide assembly and the pressure plate work together to limit the position of 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 perspective view of the second embodiment of the permanent magnet described in this invention;

[0037] Figure 8 This is a front view of the second embodiment of the permanent magnet described in this invention;

[0038] 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;

[0039] Figure 10 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;

[0040] Figure 11 This is a schematic diagram of the second embodiment of the axial magnetic field motor rotor structure described in this invention;

[0041] Figure 12 This is an exploded view of the second embodiment of the axial magnetic field motor rotor structure described in this invention;

[0042] Figure 13 This is a cross-sectional view of a second embodiment of the axial magnetic field motor rotor structure described in this invention;

[0043] Figure 14 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;

[0044] Figure 15 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;

[0045] Figure 16 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;

[0046] Figure 17 This is a schematic diagram of the third embodiment of the axial magnetic field motor rotor structure described in this invention;

[0047] Figure 18 This is an exploded view of the third embodiment of the axial magnetic field motor rotor structure described in this invention;

[0048] Figure 19 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;

[0049] Figure 20 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;

[0050] Figure 21 This is a schematic diagram of the fourth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0051] Figure 22 This is an exploded view of the fourth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0052] Figure 23 This is a cross-sectional view of the fourth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0053] Figure 24 This is a schematic diagram of the permanent magnet structure in the fourth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0054] Figure 25 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;

[0055] Figure 26 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;

[0056] Figure 27 This is a schematic diagram of the pressure plate in the fourth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0057] Figure 28 This is a schematic diagram of the assembly of the pressure plate, pole shoe core and permanent magnet in the fourth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0058] Figure 29 This is a schematic diagram of the first iron core in the fourth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0059] Figure 30 This is a schematic diagram of the fifth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0060] Figure 31 This is an exploded view of the fifth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0061] Figure 32 This is a cross-sectional view of the fifth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0062] Figure 33 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;

[0063] Figure 34 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;

[0064] Figure 35 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;

[0065] Figure 36 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;

[0066] Figure 37 This is a schematic diagram of the assembly of the pressure plate, permanent magnet and pole shoe core in the fifth embodiment of the axial magnetic field motor rotor structure of the present invention;

[0067] Figure 38 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;

[0068] Figure 39 This is a schematic diagram of the sixth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0069] Figure 40 This is an exploded view of the sixth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0070] Figure 41 This is a cross-sectional view of the sixth embodiment of the axial magnetic field motor rotor structure described in this invention;

[0071] 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;

[0072] Figure 43 This 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.

[0073] In the diagram: 100 Rotor core, 110 First core, 111 Mounting surface, 1111 Mounting groove, 1121 Internal threaded hole, 1131 External threaded hole, 1141 Intermediate threaded hole, 112 Inner boss, 113 Outer boss, 114 Limiting part, 120 Second core, 200 Permanent magnet, 201 Permanent magnet recess, 210 First surface, 220 Second surface, 230 Third surface, 240 Fourth surface, 250 Fifth surface, 300 Pole shoe core, 310 Surface body, 311 Surface body recess, 3 30 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, 600 Pressure plate, 610 Base plate, 620 Inner limiting part, 621 Inner hole, 622 Semicircular part, 630 Outer limiting part, 631 Outer hole, 640 Interpole limiting part, 641 Middle hole, 650 Claw, 700 Magnetic conductive assembly, 3000 Gap, 6000 Groove. Detailed Implementation

[0074] 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.

[0075] like Figure 2 , Figure 12 , Figure 18 , Figure 22 , Figure 31 and Figure 40 As shown, the rotor structure of the axial magnetic field motor includes:

[0076] Rotor core 100;

[0077] Several permanent magnets 200;

[0078] At least one magnetic guide component 700, the permanent magnet 200 is confined on the rotor core 100 by the magnetic guide component 700, and a plurality of the permanent magnets 200 are arranged at circumferential intervals;

[0079] The thickness of the magnetic conductive component 700 located on the surface of the permanent magnet 200 is greater than the thickness of the magnetic conductive component 700 located between adjacent permanent magnets 200.

[0080] The permanent magnet 200 is fixed to the rotor core 100 by the magnetic conductive component 700. At the same time, the magnetic conductive characteristics of the magnetic conductive component 700 are utilized, and when the thickness of the magnetic conductive component 700 on the surface of the permanent magnet 200 is greater than the thickness of the magnetic conductive component 700 between adjacent permanent magnets 200, a rotor structure with a saliency ratio of less than 1 is obtained.

[0081] The magnetic conductive assembly 700 can be fixed to the rotor core 100 by screws 500. The following three embodiments will be described in detail:

[0082] First Embodiment

[0083] like Figures 1 to 4 As shown, the magnetic conductive assembly 700 includes a plurality of pole shoe cores 300, and each permanent magnet 200 is respectively fixed to the rotor core 100 by a pole shoe core 300.

[0084] Specifically, 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.

[0085] More specifically, the pole shoe core 300 further includes an inner body 330 and an outer body 340. The inner body 330 is connected to the radially inner side of the surface body 310, and the outer body 340 is connected to the radially outer side of the surface body 310. The inner body 330 and the outer body 340 are fixed to the rotor core 100, and the permanent magnet is radially limited between the inner body 330 and the outer body 340.

[0086] 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.

[0087] like Figure 2 , Figure 3 and Figure 10As 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.

[0088] 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.

[0089] refer to Figure 2 and Figure 10 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.

[0090] like Figure 3 and 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.

[0091] 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.

[0092] 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.

[0093] like Figure 4 and Figure 9 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.

[0094] 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.

[0095] The permanent magnet 200 is radially limited between the inner edge 331 and the outer edge 341.

[0096] 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 10A 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.

[0097] like Figure 4 and Figure 9 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] like Figures 2 to 8 As shown, the permanent magnet 200 is trapezoidal, and its width gradually increases radially from the inside to the outside. 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, meaning that the upper surface of the permanent magnet 200 is completely covered by the magnetic conductive assembly 700. 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.

[0103] 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.

[0104] 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.

[0105] Taking the two circumferential sides of the permanent magnet 200 as examples, the chamfered right-angle structure and the stepped structure are introduced:

[0106] refer to Figure 5 and 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.

[0107] 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.

[0108] 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.

[0109] By designing L q and L d Different salient pole ratios can be obtained, and the formula for calculating the salient pole ratio is:

[0110] ρ=L q / L d

[0111] 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.

[0112] It is worth noting that, reference Figure 1 The magnetic conductive layer between two adjacent permanent magnets 200 (Q-axis) is 0, meaning there is no magnetic conductive layer between two adjacent permanent magnets 200. Of course, the magnetic conductive layer between two adjacent permanent magnets 200 (Q-axis) can also be non-zero.

[0113] The assembly method of the rotor structure of the axial magnetic field motor is as follows:

[0114] 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.

[0115] 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.

[0116] 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.

[0117] Second Embodiment

[0118] refer to Figures 11 to 16 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.

[0119] like Figure 12 , Figure 13 and Figure 16 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.

[0120] 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 10 This can significantly reduce losses on the rotor core and improve motor efficiency.

[0121] like Figure 14and Figure 15 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.

[0122] refer to Figure 14 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 .

[0123] like Figure 16 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 12 , Figure 14 and Figure 16 .

[0124] Third Embodiment

[0125] refer to Figures 17 to 20 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.

[0126] 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.

[0127] 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.

[0128] The pole shoe core 300 can be fixed to the rotor core 100 by a pressure plate 600. The following three embodiments will be described in detail:

[0129] Fourth embodiment

[0130] like Figures 21 to 29 As shown, the rotor structure of the axial magnetic field motor includes:

[0131] One rotor core is 100;

[0132] 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.

[0133] 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;

[0134] 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.

[0135] 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.

[0136] like Figure 22 and Figure 29 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. The 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.

[0137] The first iron core 110 may be made of high-strength structural materials to improve its support capacity.

[0138] Continue to refer to Figure 23 and Figure 29 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.

[0139] 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.

[0140] like Figure 23 and Figure 29 As shown, the inner boss 112 is provided with a plurality of circumferentially spaced limiting parts 114, each of the limiting parts 114 being disposed between two adjacent permanent magnets 200, and capable of circumferentially limiting the permanent magnets 200.

[0141] like Figures 21 to 23 , Figure 25 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.

[0142] like Figures 22 to 26 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.

[0143] 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 25 and Figure 26 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.

[0144] 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.

[0145] Continue to refer to Figure 22 and Figure 28 The 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] like Figure 27As 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 21 .

[0151] like Figure 21 and Figure 22 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.

[0152] refer to Figure 27 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.

[0153] refer to Figure 29 The 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.

[0154] Continue to refer to Figure 21 and Figure 27 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.

[0155] like Figure 29 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 22The 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.

[0156] 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.

[0157] By designing L q and L d Different salient pole ratios can be obtained, and the formula for calculating the salient pole ratio is:

[0158] ρ=L q / L d

[0159] 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 the magnetic reluctance is related to the magnitude of 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 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 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.

[0160] The assembly method of the rotor structure of the axial magnetic field motor is as follows:

[0161] 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.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] Fifth embodiment

[0166] like Figures 30 to 38 As shown, the rotor structure of the axial magnetic field motor includes:

[0167] One rotor core is 100;

[0168] A plurality of permanent magnets 200 are arranged circumferentially on the rotor core 100;

[0169] 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;

[0170] 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.

[0171] 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, which can meet the high-speed rotation requirements of axial flux motors for electric vehicles and ensure 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.

[0172] like Figure 31 and Figure 38As 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.

[0173] Continue to refer to Figure 32 and Figure 38 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.

[0174] like Figures 31 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, 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.

[0175] like Figure 34 and Figure 35 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.

[0176] 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.

[0177] refer to Figure 34 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.

[0178] like Figure 36 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.

[0179] 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.

[0180] 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.

[0181] 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 speed.

[0182] Furthermore, the inner radial surface of the permanent magnet 200 is concave and fits onto the inner limiting part 620, while the outer radial surface of the permanent magnet 200 is convex and fits onto the outer limiting part 630.

[0183] like Figures 33 to 37 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.

[0184] 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.

[0185] 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.

[0186] like Figure 31 and Figure 32 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.

[0187] refer to Figure 36 and Figure 38 The 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 1121 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 1131 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 to fix the pressure plate 600 and the first iron core 110.

[0188] refer to Figure 36 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.

[0189] 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.

[0190] The formula for calculating the salient pole ratio is:

[0191] ρ=L q / L d

[0192] ρ is the salient pole ratio, Lq 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 limiting portion 640, and the D-axis magnetic path runs along the permanent magnet 200, the surface layer 310, and the base plate 610. Since the surface layer 310 uses a high-permeability material, its 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 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.

[0193] The assembly method of the rotor structure of the axial magnetic field motor is as follows:

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] Sixth Embodiment

[0200] like Figures 39 to 43 As shown, the axial magnetic field motor rotor structure of the sixth embodiment differs from that of the fifth embodiment in that the shape of the pressure plate 600 is different.

[0201] like Figure 40 and Figure 42 As shown, the pressure plate 600 includes an inner limiting part 620, an outer limiting part 630, and a plurality of inter-element limiting parts 640. The inter-element limiting parts 640 are connected between the inner limiting part and the outer limiting part, and the plurality of inter-element limiting parts 640 are arranged at circumferential intervals. (Reference) Figure 41 An inter-pole limiting part 640 is provided between two adjacent pole shoe iron cores 300. The inner limiting part 620 and the outer limiting part 630 are fixed on the rotor iron core 100. The permanent magnet 200 is radially limited between the inner limiting part 620 and the outer limiting part 630.

[0202] 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.

[0203] like Figure 41 As shown, the width of the permanent magnet 200 gradually increases radially from the inside to the outside, 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.

[0204] The two circumferential sides of the permanent magnet 200, the two circumferential sides of the side body 350 and the two circumferential sides of the inter-pole limiting part 640 are adapted to each other, and can be provided with a right-angled structure or a stepped structure, etc.

[0205] like Figure 40, Figure 42 and Figure 43 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.

[0206] 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.

[0207] Continue to refer to Figure 42 and Figure 43 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.

[0208] 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.

[0209] The pressure plate 600 may be made of carbon fiber composite material to enhance its mechanical strength requirements.

[0210] 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 and the surface layer 310. Since 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 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 means that a rotor structure with a salient pole ratio of less than 1 is designed.

[0211] The assembly method of the rotor structure of the axial magnetic field motor is as follows:

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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.

[0216] 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); Several permanent magnets (200); At least one magnetic guide assembly (700) is provided, wherein the permanent magnet (200) is confined on the rotor core (100) by the magnetic guide assembly (700), and a plurality of the permanent magnets (200) are arranged at circumferential intervals; The thickness of the magnetic conductive assembly (700) located on the surface of the permanent magnet (200) is greater than the thickness of the magnetic conductive assembly (700) located between adjacent permanent magnets (200); The magnetically conductive assembly (700) includes: A plurality of pole shoe cores (300) are provided. Each permanent magnet (200) is fixed to the rotor core (100) by a 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 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).

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 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).

4. The axial magnetic field motor rotor structure as described in claim 3, 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 confined 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, 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.

6. 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.

7. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, It also includes a pressure plate (600), which is fixed on the rotor core (100) to fix the pole shoe core (300) disposed on the axial outer surface of the permanent magnet (200).

8. The axial magnetic field motor rotor structure as described in claim 7, characterized in that, The permanent magnet (200) has a permanent magnet recess (201) on its outer surface in the axial direction. The surface body (310) is adapted to be disposed on the upper surface in the axial direction of the permanent magnet (200), and a surface body recess (311) adapted to the permanent magnet recess (201) is formed on the surface body (310). The 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 one 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 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).

9. The axial magnetic field motor rotor structure as described in claim 7, characterized in that, The pressure plate (600) includes a base plate (610), an inner limiting part (620), an outer limiting part (630), and a plurality of inter-element limiting parts (640). The inner limiting part (620) is connected to the radial inner side of the base plate (610), the outer limiting part (630) is connected to the radial outer side of the base plate (610), and the inter-element limiting parts (640) are connected to the base plate (610) and are connected between the inner limiting part (620) and the outer limiting part (630). 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 provided between the base plate (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).

10. The axial magnetic field motor rotor structure as described in claim 7, characterized in that, The pressure plate includes an inner limiting part (620), an outer limiting part (630), and an inter-polar limiting part (640), wherein the inter-polar limiting part (640) is connected between the inner limiting part and the outer limiting part; The inner limiting part and the outer limiting part are fixed on the rotor core, and an inter-pole limiting part (640) is provided between two adjacent side bodies (350) located on different pole shoe cores (300). The permanent magnet is radially limited between the inner limiting part and the outer limiting part.

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