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, a pole shoe core, a plurality of permanent magnets and a plurality of pole shoes, the plurality of permanent magnets are arranged on the rotor core in a circumferential interval, the pole shoe core comprises a plurality of surface layers and a plurality of inter-pole bodies, the surface layers and the inter-pole bodies are connected in sequence and at intervals to form the annular pole shoe core, the inter-pole body is provided with a mounting hole, the pole shoe core is fixed on the rotor core through the mounting hole, the plurality of permanent magnets are arranged in a circumferential interval, the permanent magnets are fixed on the rotor core through the pole shoe core, the surface layers at least partially cover the upper surfaces of the permanent magnets, the inter-pole body is arranged between two adjacent permanent magnets, and the mounting hole is located between the two adjacent permanent magnets. The pole shoe core meets the requirements of fixing the permanent magnets, meets the requirement of magnetic conduction, can reduce the eddy current loss, the number of parts is small, and the assembly process is effectively reduced.

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 disk. The accuracy of the permanent magnets' mounting position directly affects the performance of an axial field motor. If the permanent magnets lack protection, they can easily become loose relative to the fixed disk, and they can also generate eddy currents and heat, affecting motor performance. Furthermore, the saliency ratio affects the motor's torque and power. Currently, due to the requirements for fixing the permanent magnets and the design of the saliency ratio, rotors have many components, making their structure complex and impacting application scenarios. 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 requirements for salient pole ratio. Furthermore, the pole shoe core satisfies the requirements for fixing the permanent magnet, as well as for magnetic conduction, and also reduces eddy current losses. Additionally, 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] The pole shoe core includes several surface bodies and several inter-pole bodies, which are alternately connected to form an annular and integral pole shoe core. The inter-pole bodies are provided with mounting holes, and the pole shoe core is fixed to the rotor core through the mounting holes.

[0008] A plurality of permanent magnets are arranged at circumferential intervals. The permanent magnets are fixed to the rotor core by the pole shoe core. The surface layer covers at least part of the upper surface of the permanent magnets. The interpole body is installed between two adjacent permanent magnets. The mounting hole is located between the two adjacent permanent magnets.

[0009] In a preferred embodiment, the mounting hole includes two or more holes of different sizes, with the larger hole being closer to the axis than the smaller hole.

[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 inner surface of the permanent magnet abuts against the rotor core in the axial direction, the outer surface of the permanent magnet abuts against the surface layer, and the two sides of the permanent magnet in the circumferential direction abut against the interpole body respectively.

[0012] In a preferred embodiment, the inter-pole body includes an inter-pole base plate and two inter-pole side plates. The inter-pole base plate is located between two adjacent permanent magnets and is fixed to the rotor core. The inter-pole side plates are connected between the inter-pole base plate and the surface body, and the inter-pole side plates abut against the circumferential side surfaces of the permanent magnets.

[0013] In a preferred embodiment, the axial dimension of the inter-electrode base plate is equal to the axial dimension of the surface layer.

[0014] In a preferred embodiment, the outer surface of the interpole body along the axial direction is flush with the outer surface of the surface body along the axial direction, the inner surface of the interpole body along the axial direction is lower than the inner surface of the surface body along the axial direction, and the axial dimension of the surface body is smaller than the axial dimension of the interpole body.

[0015] In a preferred embodiment, the sides of the permanent magnet on both circumferential sides are chamfered right angles or stepped structures.

[0016] In a preferred embodiment, the pole shoe core has a plurality of slits that penetrate the surface body and / or the inter-pole body.

[0017] In a preferred embodiment, the rotor core includes a first core, which includes a mounting surface, an inner boss, and an outer boss. The inner boss and the outer boss protrude upwards from the mounting surface. The permanent magnet is disposed on the mounting surface, and the two radial sides of the permanent magnet abut against the inner boss and the outer boss, respectively.

[0018] 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.

[0019] In a preferred embodiment, a baffle is further included, which is disposed between the permanent magnet and the interpole.

[0020] Compared with existing technologies, this technical solution has the following advantages:

[0021] The pole shoe core is formed by connecting the surface body and the inter-pole body at intervals. The surface body and the rotor core are used to axially limit and fix the permanent magnet, and the two adjacent inter-pole bodies are used to circumferentially limit and fix the permanent magnet. In addition, the inter-pole bodies and the permanent magnet can be axially and circumferentially limited by the cooperation of the inclined surface structure or the stepped structure. The inner boss and the outer boss on the rotor core are used to radially limit and fix the permanent magnet, so as to improve the installation accuracy of the permanent magnet.

[0022] The pole shoe core has slots to reduce eddy current losses. Its material also meets magnetic conductivity requirements and allows for the design of rotor structures with different saliency ratios. Because the pole shoe core is a single, integrated structure, the number of parts is reduced, assembly processes are minimized, and application scenarios and efficiency are increased.

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the first embodiment of the axial magnetic field motor rotor structure described in this invention;

[0025] Figure 2 This is an exploded view of the first embodiment of the axial magnetic field motor rotor structure described in this invention;

[0026] Figure 3 This is a perspective view of the pole shoe core in the first embodiment of the axial magnetic field motor rotor structure of the present invention;

[0027] Figure 4 This is a front view of the pole shoe core in the first embodiment of the axial magnetic field motor rotor structure of the present invention;

[0028] Figure 5 This is a perspective view of the first embodiment of the permanent magnet described in this invention;

[0029] Figure 6 This is a front view of the first embodiment of the permanent magnet described in this invention;

[0030] Figure 7 This is a front view of the second embodiment of the permanent magnet described in this invention;

[0031] 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;

[0032] Figure 9 This is an exploded view of the rotor core described in this invention;

[0033] Figure 10 This is a schematic diagram of the structure of the first iron core of the present invention;

[0034] Figure 11 This is a schematic diagram of the second embodiment of the axial magnetic field motor rotor structure described in this invention;

[0035] Figure 12 This is an exploded view of the second embodiment of the axial magnetic field motor rotor structure described in this invention;

[0036] Figure 13 This is a bottom view of the pole shoe core in the second embodiment of the axial magnetic field motor rotor structure of the present invention;

[0037] Figure 14 This is a top view of the pole shoe core in the second embodiment of the axial magnetic field motor rotor structure of the present invention;

[0038] 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;

[0039] Figure 16 This is a schematic diagram of the third embodiment of the axial magnetic field motor rotor structure described in this invention;

[0040] Figure 17 This is an exploded view of the third embodiment of the axial magnetic field motor rotor structure described in this invention;

[0041] Figure 18 This is a schematic diagram of the structure of the baffle described in this invention;

[0042] Figure 19 This is a schematic diagram of the assembly of the baffle and the permanent magnet described in this invention;

[0043] Figure 20 This is a schematic diagram of the assembly of the baffle, the permanent magnet and the pole shoe core of the present invention.

[0044] In the diagram: 100 Rotor core, 110 First core, 111 Mounting surface, 1111 Mounting groove, 1112 Threaded hole, 112 Inner boss, 113 Outer boss, 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, 320 Interpole body, 321 Interpole base plate, 3211 Mounting hole, 322 Interpole side plate, 3000 Gap, 400 Baffle, 410 Baffle inclined surface, 420 Baffle flat surface, 500 Screw. Detailed Implementation

[0045] 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.

[0046] First Embodiment

[0047] like Figures 1 to 4 As shown, the rotor structure of the axial magnetic field motor includes:

[0048] Rotor core 100;

[0049] The pole shoe core 300 includes a plurality of surface bodies 310 and a plurality of inter-pole bodies 320. The surface bodies 310 and the inter-pole bodies 320 are alternately connected to form an annular and integral pole shoe core 300. The inter-pole bodies 320 are provided with mounting holes 3211, and the pole shoe core 300 is fixed to the rotor core 100 through the mounting holes 3211.

[0050] A plurality of permanent magnets 200 are arranged at circumferential intervals. The permanent magnets 200 are fixed on the rotor core 100 by the pole shoe core 300. The surface body 310 at least partially covers the upper surface of the permanent magnets 200. The interpole body 320 is installed between two adjacent permanent magnets 300. The mounting hole 3211 is located between the two adjacent permanent magnets 200.

[0051] The pole shoe core 300 is formed by alternating and interleaved connections of the surface body 310 and the inter-pole bodies 320. The surface body 310 and the rotor core 100 axially limit and fix the permanent magnet 200, adjacent inter-pole bodies 320 circumferentially limit and fix the permanent magnet 200, and the rotor core 100 radially limit and fix the permanent magnet 200. The pole shoe core 300 is fixed to the rotor core 100 through the mounting holes 3211, ensuring the permanent magnet 200 is securely positioned between the rotor core 100 and the pole shoe core 300. This improves the accuracy of the permanent magnet 200 installation, ensuring reliable and stable motor operation. Furthermore, because the pole shoe core 300 is a single integrated structure, it not only reduces the number of parts but also effectively reduces assembly steps. Furthermore, by designing the surface body 310 and the interpole body 320 with different axial dimensions, rotor structures with different saliency ratios can be designed, achieving manufacturability and simultaneously increasing application scenarios and efficiency.

[0052] like Figure 9 and Figure 10 As shown, the rotor core 100 includes a first core 110, which includes a mounting surface 111, an inner boss 112, and an outer boss 113. The inner boss 112 and the outer boss 113 protrude upwards and are disposed on the mounting surface 111. The permanent magnet 200 is disposed on the mounting surface 111, and the two radial sides of the permanent magnet 200 abut against the inner boss 112 and the outer boss 113, respectively.

[0053] The first iron core 110 has a disc-shaped structure and uses high-strength structural materials to enhance its support capacity. The inner boss 112 is located radially inside the mounting surface 111, and the outer boss 113 is located radially outside the mounting surface 111. The mounting surface 111, the inner boss 112, and the outer boss 113 are all annular structures. The shape and size of the inner boss 112 and the outer boss 113 are matched with the permanent magnet 200, and their height should not exceed 50% of the axial dimension of the permanent magnet 200 to prevent the permanent magnet 200 from deforming or detaching under high-speed centrifugal force.

[0054] refer to Figure 2 and Figure 10 The inner protrusion 112 is provided with a plurality of circumferentially spaced limiting portions 114, each of which is disposed between two adjacent permanent magnets 200. It can be seen that a limiting portion 114 and an interpole body 320 are disposed between two adjacent permanent magnets 200. The limiting portion 114 and the interpole body 320 can be arranged radially spaced, and both can jointly limit the permanent magnet 200 circumferentially, preventing the permanent magnet 200 from shifting circumferentially.

[0055] like Figure 9 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.

[0056] 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.

[0057] like Figure 2 and Figure 5 As shown, the permanent magnet 200 is trapezoidal, and its width gradually increases radially from the inside to the outside. The radially inner side of the permanent magnet 200 is concave and fits onto the inner boss 112, while the radially outer side of the permanent magnet 200 is convex and fits onto the outer boss 113. The axial inner surface of the permanent magnet 200 abuts against the mounting surface 111 of the rotor core 100, the axial outer surface of the permanent magnet 200 abuts against the surface layer 310, and the two circumferential sides of the permanent magnet 200 abut against the interpole body 320, respectively.

[0058] See Figure 2 and Figure 8 The pole shoe core 300 encloses the permanent magnet 200 and is located on the side near the air gap.

[0059] like Figure 2 and Figure 3 As shown, the pole shoe core 300 includes a plurality of surface bodies 310 and a plurality of inter-pole bodies 320. The surface bodies 310 and the inter-pole bodies 320 are alternately connected to form a ring-shaped and integral pole shoe core 300. An inter-pole body 320 is connected between two adjacent surface bodies 310, so that the surface bodies 310 and the inter-pole bodies 320 are alternately connected.

[0060] The surface body 310 is adapted to the shape of the permanent magnet 200, and after the surface body 310 and the permanent magnet 200 are assembled, their outer peripheries are aligned, that is, the upper surface of the permanent magnet 200 is completely covered by the surface body 310.

[0061] like Figure 2 and Figure 3 As shown, the inter-pole body 320 includes an inter-pole base plate 321 and two inter-pole side plates 322. The inter-pole base plate 321 is located between two adjacent permanent magnets 200 and is fixed to the rotor core 100. The inter-pole side plates 322 are connected between the inter-pole base plate 321 and the surface body 310, and the inter-pole side plates 322 abut against the circumferential side surface of the permanent magnet 200.

[0062] The inter-electrode base plate 321 is trapezoidal, and its width gradually decreases radially from the inside to the outside to accommodate installation between two adjacent permanent magnets 200. The radially outer sides of the inter-electrode base plate 321 and the radially outer sides of the inter-electrode side plate 322 are flush with the radially outer sides of the surface body 310, while the radially inner sides of the inter-electrode base plate 321 and the radially inner sides of the inter-electrode side plate 322 are flush with each other and are recessed relative to the radially inner side of the surface body 310, thus avoiding the positioning portion 114.

[0063] refer to Figure 8 The inter-pole side plate 322 is adapted to the circumferential sides of the permanent magnet 200, wherein the circumferential sides of the permanent magnet 200 can be chamfered right angles or stepped structures.

[0064] refer to Figure 6 The 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.

[0065] 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.

[0066] 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.

[0067] By designing different axial dimensions of the inter-electrode base plate 321 and the surface body 310, different saliency ratios can be obtained, wherein the formula for calculating the saliency ratio is:

[0068] ρ=L q / L d

[0069] ρ is the salient pole ratio, L q For Q-axis inductance, L d For the D-axis inductance, L q and L d The magnitude of L is related to the magnetic reluctance along the Q-axis and D-axis magnetic paths. Within the rotor range, the difference between the Q-axis and D-axis magnetic paths is as follows: the Q-axis magnetic path runs along the inter-pole base plate 321, while the D-axis magnetic path runs along the permanent magnet 200 and the surface layer 310. Furthermore, the axial dimension of the inter-pole base plate 321 is equal to the axial dimension of the surface layer 310. Since the inter-pole base plate 321 and the surface layer 310 are made of highly permeable materials, their permeability is much greater than that of air. The permeability of the permanent magnet 200 is comparable to that of air. Therefore, the magnetic reluctance along the Q-axis magnetic path is equal to that along the D-axis magnetic path, i.e., L... q＝ L d Therefore, the salient pole ratio ρ = L q / L d =1, meaning that a rotor structure with a salient pole ratio of 1 is designed.

[0070] refer to Figure 3 The axial dimension of the inter-electrode base plate 321 is equal to the axial dimension of the surface layer 310. The axial dimension of the inter-electrode base plate 321 is its thickness. The inter-electrode base plate 321, the surface layer 310, and the inter-electrode side plate 322 have the same thickness, meaning the pole shoe core 300 is a single, uniform structure. Furthermore, on the upper surface of the pole shoe core 300, the surface layer 310 protrudes upwards, while the inter-electrode base plate 321 is recessed downwards.

[0071] like Figure 3 and Figure 4 As shown, the pole shoe core 300 has a plurality of slits 3000, which penetrate the surface body 310 and / or the inter-pole body 320. By providing the slits 3000, the induced eddy currents in the pole shoe core 300 are blocked, reducing their eddy current losses, and a conductive path is provided for the high-order harmonic magnetic field in the air gap, thus greatly reducing the high-order harmonic magnetic field passing through the rotor core, thereby significantly reducing the eddy current losses and hysteresis losses in the rotor core.

[0072] The gap 3000 can be annular, linear, or other shapes. The gap 3000 on the surface body 310 penetrates the surface body 310, and the gap 3000 on the inter-electrode base plate 321 penetrates the inter-electrode base plate 321. The gap 3000 on the surface body 310 extends to the inter-electrode side plate 322, but does not completely penetrate the inter-electrode side plate 332, to avoid breakage of the pole shoe core 300.

[0073] 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.

[0074] like Figure 3 and Figure 10 As shown, the inter-pole body 320 and the rotor core 100 are fixed together by screws 500. The inter-pole body 320 has a plurality of mounting holes 3211, and the rotor core 100 has a threaded hole 1112 opposite to the mounting holes 3211. The screws 500 pass through the mounting holes 3211 and the threaded holes 1112 for screwing.

[0075] The mounting holes 3211 are specifically located on the inter-pole base plate 321 to fix the pole shoe core 300 and the rotor core 100, and effectively improve the fastening effect, which is particularly suitable for medium and high speed motors. Each inter-pole body 320 can be fixed by screws 500 of different sizes, which can be selected according to different design requirements.

[0076] refer to Figure 2 and Figure 3 The mounting hole 3211 includes two or more holes of different sizes. The larger hole is closer to the shaft center than the smaller hole. That is, each pole piece 320 is fixed to the rotor core 100 by two screws 500 of different sizes. Moreover, the larger screw 500 is closer to the shaft center, which not only ensures the stability of the connection between the pole piece core 300 and the rotor core 100, but also ensures the smoothness of the rotor rotation.

[0077] An air gap is provided between the inner surface of the pole piece 320 and the rotor core 100. This is used to reduce eddy current losses in the pole piece core without causing a significant increase in Q-axis magnetic reluctance.

[0078] The assembly method of the rotor structure of the axial magnetic field motor is as follows:

[0079] 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.

[0080] The pole shoe core 300 is mounted on the rotor core 100. A screw 500 passes through the inter-pole body 320 of the pole shoe core 300 and is screwed onto the rotor core 100, so that the permanent magnet 200 is confined between the pole shoe core 300 and the rotor core 100. Specifically, the permanent magnet 200 is confined between the rotor core 100 and the surface body 310 of the pole shoe core 300, and between two adjacent inter-pole bodies 320.

[0081] In summary, the pole shoe core 300 is formed by the surface body 310 and the inter-pole body 320 connected at intervals. The surface body 310 and the rotor core 100 are used to axially limit and fix the permanent magnet 200, and the two adjacent inter-pole bodies 320 are used to circumferentially limit and fix the permanent magnet 200. In addition, the inter-pole body 320 and the permanent magnet 200 can be axially and circumferentially limited by the cooperation of the inclined surface structure or the stepped structure. The inner boss 112 and the outer boss 113 on the rotor core 100 are used to radially limit and fix the permanent magnet 200, so as to improve the installation accuracy of the permanent magnet 200 and enhance the fastening effect on the permanent magnet 200, which can meet the high-speed rotation requirements of the axial flux motor for electric vehicles. Furthermore, the pole shoe core 300 has a slot 3000, which reduces eddy current losses and utilizes its material to meet magnetic conductivity requirements, improving motor efficiency and enhancing the safety and reliability of the permanent magnet. It also allows for the design of rotor structures with different saliency ratios. Since the pole shoe core 300 is a single-piece structure, the number of parts is reduced, effectively minimizing assembly steps and increasing application scenarios and efficiency.

[0082] Second Embodiment

[0083] The axial magnetic field motor of the second embodiment differs from that of the first embodiment in that the shape of the pole shoe core 300 is different.

[0084] refer to Figure 11 and Figure 15 As shown, the outer surface of the interphase 320 in the axial direction is flush with the outer surface of the surface layer 310 in the axial direction, the inner surface of the interphase 320 in the axial direction is lower than the inner surface of the surface layer 310 in the axial direction, and the axial dimension of the surface layer 310 is smaller than the axial dimension of the interphase 320.

[0085] The axial dimension of the interpole body 320 is larger than that of the surface body 310, but smaller than the sum of the axial dimensions of the permanent magnet 200 and the surface body 310. Since the interpole body 320 and the surface body 310 are made of highly permeable materials, their permeability is much greater than that of air, while the permeability of the permanent magnet 200 is comparable to that of air. Therefore, the magnetic reluctance is lower along the Q-axis magnetic path and higher along the D-axis magnetic path, i.e., L... q >L d Therefore, the salient pole ratio ρ = L q / L d >1, meaning that a rotor structure with a salient pole ratio greater than 1 is designed.

[0086] The radially outer sides of the surface layer 310 and the radially outer sides of the inter-electrode body 320 are flush to form a continuous annular outer edge. The radially inner side of the inter-electrode body 320 is recessed relative to the radially inner side of the surface layer 310, thus avoiding the positioning portion 114. (See [reference]) Figures 11 to 13 This is to arrange a limiting part 114 and an interpole body 320 between two adjacent permanent magnets 200, so as to improve the ability to limit the permanent magnets 200 circumferentially.

[0087] refer to Figure 13 The inter-pole body 320 is trapezoidal, and its width gradually decreases radially from the inside to the outside, so that it fits into the gap between two adjacent permanent magnets 200. The number of permanent magnets 200 is the number of motor poles, and the number of inter-pole bodies 320 is equal to the number of permanent magnets 200, for example, both the number of inter-pole bodies 320 and the number of permanent magnets 200 are 12.

[0088] like Figures 13 to 15 As shown, the pole shoe core 300 has a plurality of slits 3000. The slits 3000 are located on the outer surface of the pole shoe core 300 in the axial direction. The slits 3000 penetrate the surface body 310, and the depth of the slits 3000 on the inter-pole body 320 is greater than the thickness of the surface body 310.

[0089] In addition, an air gap is reserved between the inner surface of the pole piece 320 in the axial direction and the rotor core 100 to reduce the eddy current loss of the pole piece core and to prevent a significant increase in the Q-axis magnetic reluctance.

[0090] Third Embodiment

[0091] The axial magnetic field motor rotor structure of the third embodiment differs from that of the second embodiment in that the axial magnetic field motor rotor structure further includes a baffle 400, as shown in the reference. Figures 16 to 20 .

[0092] The baffle 400 is disposed between the permanent magnet 200 and the inter-pole body 320, which effectively reduces inter-pole magnetic leakage, improves the utilization rate of the permanent magnet magnetic field, improves torque output and power output capability, and reduces eddy current loss of the pole shoe core.

[0093] The baffle 400 can be made of a non-magnetic or low-magnetic-permeability, low-electrical-permeability but with a certain mechanical strength. The pole shoe core 300 directly applies force to the baffle 400, and the baffle 400 then applies force to the permanent magnet 200, thereby fixing and constraining the permanent magnet 200 in the circumferential and axial directions.

[0094] like Figure 16 , Figure 17 and Figure 19 As shown, baffles 400 are respectively provided on both circumferential sides of the permanent magnet 200, and it can be seen that the number of baffles 400 is twice the number of permanent magnets 200. Figure 19 and Figure 20 As shown, the baffle 400 is adapted to the side shape of the permanent magnet 200 on both sides of the circumference. When the baffle 400 is disposed between the permanent magnet 200 and the interpole body 320, the outer peripheries of the three are aligned.

[0095] Taking the inverted right-angle structure as an example, refer to Figure 6 , Figures 18 to 20 The permanent magnet 200 has two circumferentially connected side surfaces, each including a first surface 210 and a second surface 220 extending from top to bottom and connected to each other. The first surface 210 extends and connects the outer axial surface of the permanent magnet 200 and the second surface 220, and the second surface 220 extends and connects 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 the outer axial surface and the inner axial surface of the permanent magnet 200, respectively, 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.

[0096] At this time, the baffle 400 includes a baffle inclined surface 410 and a baffle plane 420 that are connected from top to bottom. The baffle inclined surface 410 abuts against the first surface 210, and the baffle plane 420 abuts against the second surface 220, so as to achieve the alignment of the outer periphery of the two and satisfy the axial and axial limiting constraint capabilities.

[0097] 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); The pole shoe core (300) includes a plurality of surface bodies (310) and a plurality of inter-pole bodies (320). The surface bodies (310) and the inter-pole bodies (320) are alternately connected to form an annular and integral pole shoe core (300). The inter-pole bodies (320) are provided with mounting holes (3211). The pole shoe core (300) is fixed to the rotor core (100) through the mounting holes (3211). A plurality of permanent magnets (200) are arranged at circumferential intervals. The permanent magnets (200) are fixed on the rotor core (100) by the pole shoe core (300). The surface body (310) at least partially covers the upper surface of the permanent magnets (200). The interpole body (320) is installed between two adjacent permanent magnets (300). The mounting hole (3211) is located between two adjacent permanent magnets (200).

2. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, The mounting hole (3211) includes two or more holes of different sizes, with the larger hole being closer to the axis than the smaller hole.

3. 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).

4. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, The inner surface of the permanent magnet (200) abuts against the rotor core (100) in the axial direction, the outer surface of the permanent magnet (200) abuts against the surface body (310) in the axial direction, and the two sides of the permanent magnet (100) abut against the interpole body (320) in the circumferential direction.

5. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, The inter-pole body (320) includes an inter-pole base plate (321) and two inter-pole side plates (322). The inter-pole base plate (321) is located between two adjacent permanent magnets (200) and is fixed to the rotor core (200). The inter-pole side plates (322) are connected between the inter-pole base plate (321) and the surface body (310), and the inter-pole side plates (322) abut against the circumferential side surfaces of the permanent magnets (200).

6. The axial magnetic field motor rotor structure as described in claim 5, characterized in that, The axial dimension of the inter-electrode base plate (321) is equal to the axial dimension of the surface body (310).

7. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, The outer surface of the interphase (320) in the axial direction is flush with the outer surface of the surface body (310) in the axial direction. The inner surface of the interphase (320) in the axial direction is lower than the inner surface of the surface body (310) in the axial direction. The axial dimension of the surface body (310) is smaller than the axial dimension of the interphase (320).

8. The axial magnetic field motor rotor structure as described in any one of claims 1 to 7, characterized in that, The permanent magnet (200) has a right-angled or stepped structure on both sides of its circumference.

9. 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) and / or the inter-pole body (320).

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), an inner boss (112), and an outer boss (113). The inner boss (112) and the outer boss (113) are raised upward on the mounting surface (111). The permanent magnet (200) is disposed on the mounting surface (111), and the two radial sides of the permanent magnet (200) abut against the inner boss (112) and the outer boss (113), respectively.

11. 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).

12. The axial magnetic field motor rotor structure as described in claim 1, characterized in that, It also includes a baffle (400) disposed between the permanent magnet (200) and the interpole (320).

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