Rotors, motors and vehicles

Abstract

The present invention discloses a rotor, a motor and a vehicle, comprising: a rotor core, the rotor core surrounds a center hole, the rotor core is provided with a first mounting slot group and a first connecting structure, the first mounting slot group includes a first mounting slot and a second mounting slot; a first permanent magnet group, the first permanent magnet group includes a first permanent magnet and a second permanent magnet, the first permanent magnet is installed in the first mounting slot, and the second permanent magnet is installed in the second mounting slot; a center block, the center block is assembled in the center hole, the center block is provided with a second connecting structure and a rotating shaft hole, the second connecting structure is a non-magnetic conductive part and cooperates with the first connecting structure, and the second connecting structure extends between the first permanent magnet and the second permanent magnet to separate the first permanent magnet and the second permanent magnet; a rotating shaft, the rotating shaft cooperates with the rotating shaft hole and rotates synchronously with the center block and the rotor core. The rotor according to the present invention can avoid rotor magnetic leakage, and has the advantages of good magnetic isolation effect and high structural strength.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor, a motor and a vehicle. Background Art

[0002] The rotor in the related technology usually includes a rotor core, on which a first mounting groove and a second mounting groove are provided, and the first permanent magnet and the second permanent magnet are respectively installed in the first mounting groove and the second mounting groove. However, due to unreasonable structural settings, the first permanent magnet and the second permanent magnet cannot be magnetically isolated, resulting in rotor magnetic leakage. Even if magnetic isolation is achieved, the strength of the magnetic isolation structure between the first permanent magnet and the second permanent magnet is low, and it is easy to deform or even break, and the service life of the rotor is short. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a rotor which can avoid rotor magnetic leakage and has the advantages of good magnetic isolation effect and high structural strength.

[0004] According to the present invention, a motor having the above rotor is also provided.

[0005] The present invention also provides a vehicle having the motor.

[0006] In order to achieve the above-mentioned purpose, a rotor is proposed according to a first aspect of the present invention, comprising: a rotor core, the rotor core is constructed in a ring shape and surrounds a center hole, the rotor core is provided with a first mounting slot group and a first connecting structure, the first mounting slot group includes a first mounting slot and a second mounting slot arranged along the circumference of the rotor core; a first permanent magnet group, the first permanent magnet group includes a first permanent magnet and a second permanent magnet, the first permanent magnet is installed in the first mounting slot, and the second permanent magnet is installed in the second mounting slot; a center block, the center block is assembled in the center hole of the rotor core, the center block is provided with a second connecting structure and a shaft hole, the second connecting structure is a non-magnetic part and cooperates with the first connecting structure, the second connecting structure extends between the first permanent magnet and the second permanent magnet to separate the first permanent magnet and the second permanent magnet; a shaft, the shaft cooperates with the shaft hole and rotates synchronously with the center block and the rotor core.

[0007] The rotor according to the embodiment of the present invention can avoid rotor magnetic leakage and has the advantages of good magnetic isolation effect and high structural strength.

[0008] According to some embodiments of the present invention, the first connecting structure is a first connecting groove opened on the inner circumferential surface of the rotor core, and the first connecting groove is connected to the center hole; the second connecting structure is a first matching column arranged on the outer circumferential surface of the center block, and the first matching column is matched with the first connecting groove to position the rotor core in the radial and circumferential directions of the center block.

[0009] According to some embodiments of the present invention, the first connecting groove is communicated with the first mounting groove and the second mounting groove respectively, and the first matching column is spaced apart from the first permanent magnet and the second permanent magnet respectively.

[0010] According to some embodiments of the present invention, an inner wall of the first mounting groove at one end adjacent to the first connecting groove is configured with a first stop block, and the first stop block stops the first permanent magnet so as to separate the first permanent magnet from the first matching column; an inner wall of the second mounting groove at one end adjacent to the first connecting groove is configured with a second stop block, and the second stop block stops the second permanent magnet so as to separate the second permanent magnet from the first matching column.

[0011] According to some embodiments of the present invention, the first mating column includes: a first extension portion, which extends radially outward along the center block to between the first permanent magnet and the second permanent magnet, and the first extension portion cooperates with the first connecting groove to position the rotor core in the circumferential direction of the center block; a first reinforcement portion, which is connected to the outer end of the first extension portion and is perpendicular to the first extension portion, and the first reinforcement portion cooperates with the first connecting groove to position the rotor core in the radial direction of the center block; wherein the shape of the first connecting groove is adapted to the shape of the first mating column.

[0012] According to some embodiments of the present invention, the length of the orthographic projection of the first reinforcement portion on a plane perpendicular to the axial direction of the rotor core is not less than 2 mm, and the width of the orthographic projection of the first reinforcement portion on a plane perpendicular to the axial direction of the rotor core is not less than 1 mm.

[0013] According to some embodiments of the present invention, the width of the orthographic projection of the first extension portion on a plane perpendicular to the axial direction of the rotor core is L1, and the size of the first permanent magnet group in the axial direction of the rotor core is L2, wherein 10%≤L1 / L2≤50%; a line connecting two points closest to adjacent side walls of the first mounting groove and the second mounting groove is defined as an imaginary line, and a dimension L3 of the first extension portion extending radially outward from the imaginary line along the rotor core is not less than 1 mm.

[0014] According to some embodiments of the present invention, one end of the first reinforcing portion is connected to the first extending portion; or the center of the first reinforcing portion in the length direction is connected to the first extending portion.

[0015] According to some embodiments of the present invention, the side of the first reinforcement portion facing away from the first extension portion is a plane, and the side of the first reinforcement portion facing the first extension portion is a plane; or the side of the first reinforcement portion facing away from the first extension portion is an outwardly curved surface, and the side of the first reinforcement portion facing the first extension portion is a plane.

[0016] According to some embodiments of the present invention, both the first mounting slot group and the first connecting structure are multiple and arranged at intervals along the circumferential direction of the rotor core; the first permanent magnet group is multiple and is installed one-to-one in the multiple first mounting slot groups, and the second connecting structure is multiple and is matched with the multiple first connecting structures one-to-one; the first permanent magnet and the second permanent magnet of each first permanent magnet group are separated by the corresponding second connecting structure.

[0017] According to some embodiments of the present invention, the rotor core is provided with a plurality of third connection structures, a plurality of the first connection structures and a plurality of the third connection structures are spaced apart and alternately arranged along the circumference of the rotor core, and each of the third connection structures is located between two adjacent first permanent magnet groups in the circumferential direction of the rotor core; the center block is provided with a plurality of fourth connection structures, a plurality of the second connection structures and a plurality of the fourth connection structures are spaced apart and alternately arranged along the circumference of the center block, and a plurality of the fourth connection structures are matched with a plurality of the third connection structures in a one-to-one correspondence.

[0018] According to some embodiments of the present invention, the third connection structure is a second connection groove opened on the inner circumferential surface of the rotor core, and the second connection groove is connected to the center hole; the fourth connection structure is a second matching column arranged on the outer circumferential surface of the center block, and the second matching column is matched with the second connection groove to position the rotor core in the radial and circumferential directions of the center block.

[0019] According to some embodiments of the present invention, the second mating column includes: a second extension portion, which extends outward in the radial direction of the center block, and the second extension portion cooperates with the second connecting groove to position the rotor core in the circumferential direction of the center block; a second reinforcement portion, which is connected to the outer end of the second extension portion and is perpendicular to the second extension portion, and the second reinforcement portion cooperates with the second connecting groove to position the rotor core in the radial direction of the center block; wherein the shape of the second connecting groove is adapted to the shape of the second mating column.

[0020] According to some embodiments of the present invention, one end of the second reinforcing portion is connected to the second extending portion; or the center of the second reinforcing portion in the length direction is connected to the second extending portion.

[0021] According to some embodiments of the present invention, the side of the second reinforcement portion facing away from the second extension portion is a plane, and the side of the second reinforcement portion facing the second extension portion is a plane; or, the side of the second reinforcement portion facing away from the second extension portion is an outwardly curved surface, and the side of the second reinforcement portion facing the second extension portion is a plane.

[0022] According to some embodiments of the present invention, the dimension of the second connecting structure in the radial direction of the central block is not less than the dimension of the fourth connecting structure in the radial direction of the central block; and / or, the maximum dimension of the second connecting structure in the circumferential direction of the central block is equal to the maximum dimension of the fourth connecting structure in the circumferential direction of the central block.

[0023] According to some embodiments of the present invention, the central block is provided with a plurality of weight-reducing holes arranged at intervals along its circumference; wherein each of the weight-reducing holes is located between two adjacent second connection structures or between two adjacent fourth connection structures in the circumferential direction of the central block.

[0024] According to some embodiments of the present invention, the center block has a plurality of first reinforcing ribs, two adjacent weight-reducing holes are separated by the first reinforcing ribs, the first reinforcing ribs extend along the radial direction of the center block and correspond to a position in the second connecting structure and the fourth connecting structure; the length of the orthographic projection of the first reinforcing rib on a plane perpendicular to the axial direction of the rotor core is L4, the difference between the outer diameter and the inner diameter of the center block is L5, wherein 40%≤L4 / L5≤80%; and / or the width of the orthographic projection of the first reinforcing rib on a plane perpendicular to the axial direction of the rotor core is not less than 2 times the minimum width of the orthographic projection of the fourth connecting structure on a plane perpendicular to the axial direction of the rotor core.

[0025] According to some embodiments of the present invention, each of the weight-reducing holes is provided with a second reinforcing rib, which extends radially along the center block and corresponds to another position in the second connecting structure and the fourth connecting structure; the length of the orthographic projection of the second reinforcing rib on a plane perpendicular to the axial direction of the rotor core is L6, and the difference between the outer diameter and the inner diameter of the center block is L5, wherein 40%≤L6 / L5≤80%; and / or the width of the orthographic projection of the second reinforcing rib on a plane perpendicular to the axial direction of the rotor core is not less than the minimum width of the orthographic projection of the fourth connecting structure on a plane perpendicular to the axial direction of the rotor core and is not greater than the width of the orthographic projection of the first reinforcing rib on a plane perpendicular to the axial direction of the rotor core.

[0026] According to some embodiments of the present invention, the rotor also includes: a second permanent magnet group, the rotor core is also provided with a second mounting slot group, the second mounting slot group is located on the outside of the first mounting slot group in the radial direction of the rotor core, the second mounting slot group includes a third mounting slot and a fourth mounting slot arranged along the circumferential direction of the rotor core, the second permanent magnet group includes a third permanent magnet and a fourth permanent magnet, the third permanent magnet is installed in the third mounting slot, and the fourth permanent magnet is installed in the fourth mounting slot.

[0027] According to some embodiments of the present invention, the second connection structure is spaced apart from the second permanent magnet group in the radial direction of the rotor core.

[0028] According to some embodiments of the present invention, the maximum distance between the first mounting slot group and the second mounting slot group in the radial direction of the rotor core is L7, a line connecting two points closest to adjacent side walls of the first mounting slot and the second mounting slot is defined as an imaginary line, and a dimension of the first extension portion extending outwardly along the radial direction of the rotor core beyond the imaginary line is L3, and L3 / L7≤50%.

[0029] According to some embodiments of the present invention, the distance between the first permanent magnet and the second permanent magnet gradually increases radially outwardly along the rotor core, and the distance between the third permanent magnet and the fourth permanent magnet gradually increases radially outwardly along the rotor core; wherein the angle between the first permanent magnet and the fourth permanent magnet is smaller than the angle between the third permanent magnet and the fourth permanent magnet; the first permanent magnet group is symmetrical about a preset radius, and the second permanent magnet group is symmetrical about the preset radius.

[0030] According to some embodiments of the present invention, the second connection structure is a non-magnetic conductive part formed integrally with the central block.

[0031] According to some embodiments of the present invention, the rotor core includes a plurality of rotor punchings arranged in a stacked manner, and each of the rotor punchings is configured as an annular integral piece.

[0032] According to some embodiments of the present invention, a central axis of the rotating shaft hole, a central axis of the central block and a central axis of the rotor core coincide with each other.

[0033] According to a second aspect of the present invention, an electric motor is provided, comprising the rotor according to the first aspect of the present invention.

[0034] The motor according to the second aspect of the present invention can avoid rotor magnetic leakage by utilizing the rotor according to the first aspect of the present invention, and has the advantages of good magnetic isolation effect and high structural strength.

[0035] According to some embodiments of the present invention, the number P of the first permanent magnet groups is an even number and is equal to the number of the second connection structures.

[0036] According to some embodiments of the present invention, a central angle corresponding to each of the second connection structures is smaller than 90° / P.

[0037] According to a third aspect of the present invention, a vehicle is provided, comprising the motor according to the second aspect of the present invention.

[0038] The vehicle according to the third aspect of the present invention can avoid rotor magnetic leakage by utilizing the motor according to the second aspect of the present invention, and has the advantages of good magnetic isolation effect and high structural strength.

[0039] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0041] Figure 1 is a schematic structural diagram of a rotor according to an embodiment of the present invention.

[0042] Figure 2 is an exploded view of a rotor according to an embodiment of the present invention.

[0043] Figure 3 is a schematic structural diagram of a rotor core of a rotor according to an embodiment of the present invention.

[0044] Figure 4 is a schematic structural diagram of a central block of a rotor according to an embodiment of the present invention.

[0045] Figure 5 is a schematic structural diagram of a rotor core of a rotor according to an embodiment of the present invention.

[0046] Figure 6 4 is a schematic structural diagram of a rotor core of a rotor according to another embodiment of the present invention.

[0047] Figure 7 4 is a schematic structural diagram of a rotor core of a rotor according to another embodiment of the present invention.

[0048] Figure 8 yes Figure 5 Detailed view of A.

[0049] Fig. 9 is a schematic structural diagram of a rotor according to an embodiment of the present invention.

[0050] Fig.10 is a schematic structural diagram of a rotor according to another embodiment of the present invention.

[0051] Fig.11 4 is a schematic structural diagram of a rotor according to another embodiment of the present invention.

[0052] Reference numerals:

[0053] 1. Rotor;

[0054] 100, rotor core; 110, center hole; 120, first mounting slot group; 121, first mounting slot; 122, first stop block; 123, second mounting slot; 124, second stop block; 130, first connecting structure; 131, first connecting slot; 140, third connecting structure; 141, second connecting slot; 150, second mounting slot group; 151, third mounting slot; 152, fourth mounting slot; 160, rotor punching;

[0055] 200, first permanent magnet group; 210, first permanent magnet; 220, second permanent magnet;

[0056] 300, center block; 310, second connection structure; 311, first matching column; 312, first extension portion; 313, first reinforcement portion; 320, shaft hole; 330, fourth connection structure; 331, second matching column; 332, second extension portion; 333, second reinforcement portion; 340, weight reduction hole; 350, first reinforcement rib; 360, second reinforcement rib;

[0057] 400, imaginary line;

[0058] 500, second permanent magnet group; 510, third permanent magnet; 520, fourth permanent magnet. DETAILED DESCRIPTION

[0059] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0061] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0062] In the description of the present invention, "plurality" means two or more.

[0063] The rotor 1 according to an embodiment of the present invention will be described below with reference to the drawings.

[0064] like Figure 1-Figure 11 As shown, the rotor 1 according to the embodiment of the present invention includes a rotor core 100, a first permanent magnet group 200, a center block 300 and a rotating shaft.

[0065] The rotor core 100 is configured in an annular shape and surrounds a central hole 110. The rotor core 100 is provided with a first mounting groove group 120 and a first connecting structure 130. The first mounting groove group 120 includes a first mounting groove 121 and a second mounting groove 123 arranged along the circumference of the rotor core 100. The first permanent magnet group 200 includes a first permanent magnet 210 and a second permanent magnet 220. The first permanent magnet 210 is installed in the first mounting groove 121, and the second permanent magnet 220 is installed in the second mounting groove 123. The center block 300 is assembled in the center hole 110 of the rotor core 100. The center block 300 is provided with a second connecting structure 310 and a shaft hole 320. The second connecting structure 310 is a non-magnetic part and cooperates with the first connecting structure 130. The second connecting structure 310 extends between the first permanent magnet 210 and the second permanent magnet 220 to separate the first permanent magnet 210 and the second permanent magnet 220. The shaft cooperates with the shaft hole 320 and rotates synchronously with the center block 300 and the rotor core 100.

[0066] For example, the rotor core 100 may include a plurality of rotor punchings 160 stacked, each rotor punching 160 being configured as an annular integral part, that is, the rotor core 100 may be formed by stacking a plurality of rotor punchings 160, each rotor punching 160 may be processed by punching, and the rotor punchings 160 may be supported by silicon steel material, so that the structural strength of the rotor punchings 160 is higher, thereby improving the overall structural strength of the rotor core 100. The center block 300 may be made of stainless steel, and since stainless steel is lighter, the weight of the rotor 1 may be reduced.

[0067] According to the rotor 1 of the embodiment of the present invention, by configuring the rotor core 100 into a ring shape and surrounding a center hole 110, the rotor core 100 is provided with a first mounting groove group 120, the first mounting groove group 120 includes a first mounting groove 121 and a second mounting groove 123 arranged along the circumference of the rotor core 100, the first permanent magnet 210 is installed in the first mounting groove 121, and the second permanent magnet 220 is installed in the second mounting groove 123, thereby, the first mounting groove 121 can pre-position the first permanent magnet 210 and can fix the first permanent magnet 210, the second mounting groove 123 can pre-position the second permanent magnet 220 and can fix the second permanent magnet 220, thereby improving the structural strength of the rotor 1, and the first permanent magnet 210 and the second permanent magnet 220 can generate a corresponding magnetic field between the first permanent magnet 210 and the second permanent magnet 220 through relative direct current, and complete the energy conversion between magnetic energy, kinetic energy and electrical energy through the relative rotation of the rotor 1 and the stator.

[0068] In addition, the center block 300 is assembled in the center hole 110 of the rotor core 100, and the center block 300 is provided with a second connecting structure 310 and a shaft hole 320. The second connecting structure 310 cooperates with the first connecting structure 130, and the shaft cooperates with the shaft hole 320 and rotates synchronously with the center block 300 and the rotor core 100. Therefore, through the cooperation of the first connecting structure 130 and the second connecting structure 310, the center block 300 and the rotor core 100 can be assembled and fixed together, and when the rotor core 100 rotates, it can drive the center block 300 and the shaft to rotate together.

[0069] Furthermore, the second connecting structure 310 is a non-magnetic part, and the second connecting structure 310 extends between the first permanent magnet 210 and the second permanent magnet 220 to separate the first permanent magnet 210 and the second permanent magnet 220. That is to say, the second connecting structure 310 can separate the first permanent magnet 210 and the second permanent magnet 220 in the circumferential direction of the rotor core 100. In this way, the second connecting structure 310 can not only be used to connect and fix the center block 300 and the rotor core 100, but also can be used to separate the magnetic force between the first permanent magnet 210 and the second permanent magnet 220, thereby playing a magnetic isolation role, improving the magnetic isolation effect of the rotor 1, which is beneficial to reducing the magnetic leakage of the rotor 1, thereby improving the torque density and power density of the motor.

[0070] Moreover, by constructing the center block 300 as an integral part, the axial dimension of the second connection structure 310 of the rotor 1 can be the same as the axial dimension of the rotor 1, thereby improving the structural strength of the second connection structure 310, and the load-bearing capacity of the second connection structure 310 is stronger. When the rotor 1 rotates at high speed, the second connection structure 310 can withstand a greater centrifugal force, thereby avoiding deformation of the second connection structure 310, further reducing the risk of breakage and failure of the second connection structure 310, and the connection between the center block 300 and the rotor core 100 is more reliable and the magnetic isolation effect of the rotor 1 is also more reliable.

[0071] Compared with the rotor in the related art that uses rotor punching to magnetically isolate the first permanent magnet and the second permanent magnet, the second connecting structure 310 of the rotor 1 in the embodiment of the present invention has a larger contact area with the first permanent magnet 210 and the second permanent magnet 220, thereby reducing the local stress of the second connecting structure 310, reducing the probability of deformation and fracture of the second connecting structure 310, and improving the service life of the rotor 1.

[0072] In this way, the rotor 1 according to the embodiment of the present invention can prevent magnetic leakage of the rotor 1 and has the advantages of good magnetic isolation effect and high structural strength.

[0073] In some specific embodiments of the present invention, Figure 1-Figure 3 , Figure 5-Figure 8 As shown, the first connection structure 130 is a first connection groove 131 opened on the inner circumference of the rotor core 100, and the first connection groove 131 is connected to the center hole 110. The second connection structure 310 is a first matching column 311 arranged on the outer circumference of the center block 300, and the first matching column 311 is matched with the first connection groove 131 to position the rotor core 100 in the radial and circumferential directions of the center block 300.

[0074] In this way, the first matching column 311 can extend into the first connecting groove 131, and the first matching column 311 can stop against the bottom wall of the first connecting groove 131 to limit the center block 300 in the radial direction of the rotor core 100, thereby avoiding radial displacement of the center block 300 and the rotor core 100. At the same time, the first matching column 311 can stop against the side walls of the first connecting groove 131 on the opposite sides of the circumferential direction of the rotor core 100, thereby limiting the center block 300 in the circumferential direction of the rotor core 100, thereby avoiding circumferential relative displacement of the center block 300 and the rotor core 100. The connection and fixation between the center block 300 and the rotor core 100 are more stable and reliable, and the limiting effect is better.

[0075] Furthermore, through the matching of the slots and columns, the structures of the first connection structure 130 and the second connection structure 310 are simpler, the processing is more convenient and the assembly steps are relatively simple, which is beneficial to the assembly between the center block 300 and the rotor core 100 .

[0076] Moreover, the first connecting groove 131 is connected to the center hole 110, so that the first matching column 311 and the center block 300 can be used as an integrated part. After the center block 300 is assembled into the center hole 110, the first assembly column can be inserted into the first connecting groove 131, which makes assembly more convenient and facilitates the center block 300 to be formed into one piece.

[0077] In some specific embodiments of the present invention, Figure 5-Figure 8 As shown, the first connecting groove 131 is connected to the first mounting groove 121 and the second mounting groove 123 respectively. Specifically, one side of the first connecting groove 131 is connected to the first mounting groove 121, and the other side of the first connecting groove 131 is connected to the second mounting groove 123. The first mounting groove 121 and the second mounting groove 123 can be arranged on opposite sides of the first connecting groove 131, so that the first mounting groove 121 and the second mounting groove 123 can be separated by the first connecting groove 131, so that the second connecting structure 310 can separate the first permanent magnet 210 and the second permanent magnet 220. Moreover, this can simplify the structure of the first mounting groove 121, the second mounting groove 123 and the first connecting groove 131, and then simplify the structure of the rotor core 100, so that the processing of the rotor core 100 is more convenient.

[0078] In addition, the first matching column 311 is spaced apart from the first permanent magnet 210 and the second permanent magnet 220, respectively. That is, the first permanent magnet 210 is installed in the first installation groove 121 and the first permanent magnet 210 is spaced apart from the first matching column 311, and the second permanent magnet 220 is installed in the second installation groove 123 and the second permanent magnet 220 is spaced apart from the first matching column 311. In this way, the first matching column 311 will not interfere with the first permanent magnet 210 and the second permanent magnet 220 during assembly, and the assembly is more convenient. Moreover, when the rotor 1 rotates at high speed, the first permanent magnet 210 and the second permanent magnet 220 will not squeeze the first matching column 311, thereby avoiding the first matching column 311 from being squeezed and deformed, further reducing the risk of the first matching column 311 breaking and causing the rotor 1 to fail, and the rotor 1 has higher reliability.

[0079] Furthermore, if Figure 8 As shown, the inner wall of the first installation groove 121 adjacent to one end of the first connection groove 131 is configured with a first stop block 122 , and the first stop block 122 stops the first permanent magnet 210 to separate the first permanent magnet 210 from the first matching column 311 .

[0080] Specifically, the first stop block 122 can protrude from the side wall of the first mounting groove 121 so that the diameter of the first mounting groove 121 at the first stop block 122 is smaller than the diameter of the first permanent magnet 210, so that the first permanent magnet 210 can be stopped by the first stop block 122 to prevent the first permanent magnet 210 from directly contacting the first matching column 311, thereby effectively separating the first permanent magnet 210 and the first matching column 311.

[0081] Furthermore, a second stop block 124 is configured on an inner wall of one end of the second installation slot 123 adjacent to the first connection slot 131 . The second stop block 124 stops the second permanent magnet 220 to separate the second permanent magnet 220 from the first matching column 311 .

[0082] Specifically, the second stop block 124 can protrude from the side wall of the second mounting groove 123 so that the diameter of the second mounting groove 123 at the second stop block 124 is smaller than the diameter of the second permanent magnet 220, so that the second permanent magnet 220 can be stopped by the second stop block 124 to prevent the second permanent magnet 220 from directly contacting the second matching column 331, thereby effectively separating the second permanent magnet 220 and the second matching column 331.

[0083] In some specific embodiments of the present invention, Figure 9-11 As shown, the first mating column 311 includes a first extending portion 312 and a first reinforcing portion 313 .

[0084] The first extension portion 312 extends radially outwardly along the center block 300 to between the first permanent magnet 210 and the second permanent magnet 220. The first extension portion 312 cooperates with the first connecting groove 131 to position the rotor core 100 in the circumferential direction of the center block 300. The first reinforcement portion 313 is connected to the outer end of the first extension portion 312 and is perpendicular to the first extension portion 312. The first reinforcement portion 313 cooperates with the first connecting groove 131 to position the rotor core 100 in the radial direction of the center block 300. The shape of the first connecting groove 131 is adapted to the shape of the first matching column 311.

[0085] Among them, the shape of the first connecting groove 131 is adapted to the shape of the first matching column 311, which means that the shape of the first matching column 311 and the shapes of the first extension portion 312 and the first reinforcement portion 313 are adapted, so that the first extension portion 312 and the first reinforcement portion 313 can both extend into the first connecting groove 131, and the first matching column 311 can stop at the first connecting groove 131, thereby limiting and fixing the center block 300 in both radial and circumferential directions.

[0086] It can be understood that the first extension portion 312 extends radially outward along the center block 300, so that both sides of the first extension portion 312 in the width direction can stop at the side walls of the first connecting groove 131, thereby limiting the width direction of the first extension portion 312, that is, limiting the circumferential direction of the center block 300, to avoid relative rotation between the center block 300 and the rotor core 100.

[0087] In addition, the first reinforcement portion 313 is connected to the outer end of the first extension portion 312 and is perpendicular to the first extension portion 312. The first reinforcement portion 313 can increase the contact area between the first matching column 311 and the first connecting groove 131, and the matching is more stable and reliable. Moreover, the first reinforcement portion 313 and the first extension portion 312 can form a "T"-shaped structure, so that the first reinforcement portion 313 and the first connecting groove 131 can be limited in the radial direction of the center block 300, that is, the center block 300 can be limited in its direction, thereby avoiding relative displacement of the center block 300 and the rotor core 100 in the radial direction of the center block 300, and further improving the assembly stability of the center block 300 and the rotor core 100.

[0088] In some specific embodiments of the present invention, the length of the orthographic projection of the first reinforcement portion 313 on the plane perpendicular to the axial direction of the rotor core 100 is not less than 2 mm, and the width of the orthographic projection of the first reinforcement portion 313 on the plane perpendicular to the axial direction of the rotor core 100 is not less than 1 mm.

[0089] In this way, the contact area between the first reinforcement part 313 and the first connecting groove 131 is larger, and the cooperation between the first reinforcement part 313 and the first connecting groove 131 is more reliable, which further improves the limiting effect of the rotor core 100 and the center block 300, and the structural strength of the first reinforcement part 313 is higher. When the rotor 1 rotates at high speed, the extrusion pressure between the first reinforcement part 313 and the first connecting part becomes larger, and the first reinforcement part 313 will not be deformed, which further improves the connection strength between the first connecting structure 130 and the second connecting structure 310, and the connection and fixation of the center block 300 and the rotor core 100 are more reliable.

[0090] In some specific embodiments of the present invention, Figure 8 As shown, the width of the orthographic projection of the first extension portion 312 on a plane perpendicular to the axial direction of the rotor core 100 is L1, and the dimension of the first permanent magnet group 200 in the axial direction of the rotor core 100 is L2, wherein 10%≤L1 / L2≤50%.

[0091] It can be understood that the first matching column 311 needs to separate the first permanent magnet 210 and the second permanent magnet 220, that is, in the axial direction of the rotor core 100, the size of the first extension portion 312 is not less than the size of the first permanent magnet group 200, or the size of the first extension portion 312 needs to be equal to the size of the first permanent magnet group 200, so that the first permanent magnet 210 and the second permanent magnet 220 can be completely separated, and the magnetic isolation effect is better.

[0092] Therefore, in the axial direction of the rotor core 100, the size of the first extension portion 312 is equal to the size of the first permanent magnet group 200, which is L2. By setting 10%≤L1 / L2≤50%, on the one hand, the width of the first extension portion 312 can be prevented from being too small, and when the size of the first extension portion 312 along the axial direction of the rotor core 100 increases, the width of the first extension portion 312 also increases accordingly, thereby improving the structural strength of the first extension portion 312. On the other hand, the width of the first extension portion 312 can be prevented from being too large, so that the space occupied by the first extension portion 312 in the circumferential direction of the rotor core 100 will not be too large, which is convenient for assembly.

[0093] In addition, a line connecting two points of the adjacent side walls of the first installation groove 121 and the second installation groove 123 is defined as an imaginary line 400, and a dimension L3 of the first extension portion 312 extending outward from the imaginary line 400 in the radial direction of the rotor core 100 is not less than 1 mm.

[0094] Specifically, extending radially outward from the rotor core 100, the distance between the first mounting groove 121 and the second mounting groove 123 gradually increases. The imaginary line 400 is the distance between the side of the first mounting groove 121 close to the center hole 110 facing away from the center hole 110 and the side of the second mounting groove 123 close to the center hole 110 facing away from the center hole 110. With this arrangement, on the one hand, the first matching column 311 can be inserted into the first connecting groove 131 to completely separate the first permanent magnet 210 and the second permanent magnet 220, thereby achieving a better magnetic isolation effect. On the other hand, along the radial direction outward from the rotor core 100 beyond the imaginary line 400, the distance between the first mounting groove 121 and the second mounting groove 123 is relatively large, thereby providing an accommodation space for the first reinforcement portion 313 for easy arrangement.

[0095] In some specific embodiments of the present invention, Fig. 9 and Fig.10 As shown, one end of the first reinforcement portion 313 is connected to the first extension portion 312, that is, the first reinforcement portion 313 and the first extension portion 312 can form an "L" shape, which can simplify the structure of the first reinforcement portion 313 and the first extension portion 312, facilitate the connection between the first reinforcement portion 313 and the first extension portion 312, and make processing more convenient.

[0096] In some other specific embodiments of the present invention, Fig.11 As shown, the center of the length direction of the first reinforcement portion 313 is connected to the first extension portion 312, that is, the first reinforcement portion 313 and the first extension portion 312 can form a "T" shape, the connection between the first reinforcement portion 313 and the first extension portion 312 is more reliable, and the extension length of the first reinforcement portion 313 along the circumference of the rotor core 100 can be longer, and the limiting effect is better.

[0097] It should be noted that the length of the first reinforcement portion 313 of the “L”-shaped first matching column 311 can be smaller than the length of the first reinforcement portion 313 of the “T”-shaped first matching column 311, which can improve the structural strength of the “L”-shaped first matching column 311.

[0098] In some specific embodiments of the present invention, Fig. 9 and Fig.10 As shown, the side of the first reinforcement portion 313 facing away from the first extension portion 312 is a plane, and the side of the first reinforcement portion 313 facing the first extension portion 312 is a plane, so that the structure of the first reinforcement portion 313 is simpler and easier to process, and the structure of the first connecting groove 131 at the matching point with the first reinforcement portion 313 can also be relatively simple, that is, the side of the first connecting groove 131 facing the first reinforcement portion 313 and facing away from the first extension portion 312 can also be a plane, which is easier to process.

[0099] In some other specific embodiments of the present invention, Fig.11 As shown, the side of the first reinforcement portion 313 facing away from the first extension portion 312 is an outwardly curved surface, and the side of the first reinforcement portion 313 facing the first extension portion 312 is a plane. In this way, the contact area between the side of the first reinforcement portion 313 facing away from the first extension portion 312 and the first connecting groove 131 is larger, the stop is more stable, and stress concentration is not easy to occur when the extrusion pressure between the first reinforcement portion 313 and the first connecting groove 131 is large, thereby further improving the structural strength of the first reinforcement portion 313.

[0100] In some specific embodiments of the present invention, Figure 5-Figure 7 As shown, both the first mounting slot group 120 and the first connecting structure 130 are multiple and are arranged at intervals along the circumferential direction of the rotor core 100, the first permanent magnet group 200 is multiple and is installed one-to-one in the multiple first mounting slot groups 120, the second connecting structure 310 is multiple and is matched with the multiple first connecting structures 130 one-to-one, and the first permanent magnet 210 and the second permanent magnet 220 of each first permanent magnet group 200 are separated by the corresponding second connecting structure 310.

[0101] In this way, the cooperation between the multiple first connecting structures 130 and the multiple second connecting structures 310 further improves the connection strength between the rotor core 100 and the center block 300, and the connection between the rotor core 100 and the center block 300 is more stable and reliable. In addition, each first permanent magnet 210 and each second permanent magnet 220 can be separated by a first connecting structure 130, thereby ensuring the magnetic isolation effect of the rotor 1 and further reducing the magnetic leakage of the rotor 1.

[0102] In some specific embodiments of the present invention, Figure 5-Figure 7 As shown, the rotor core 100 is provided with a plurality of third connection structures 140, a plurality of first connection structures 130 and a plurality of third connection structures 140 are spaced and alternately arranged along the circumference of the rotor core 100, each third connection structure 140 is located between two adjacent first permanent magnet groups 200 in the circumferential direction of the rotor core 100, and the center block 300 is provided with a plurality of fourth connection structures 330, a plurality of second connection structures 310 and a plurality of fourth connection structures 330 are spaced and alternately arranged along the circumferential direction of the center block 300, and the plurality of fourth connection structures 330 are matched with the plurality of third connection structures 140 in a one-to-one correspondence.

[0103] That is to say, while arranging a plurality of first connection structures 130 and a plurality of second connection structures 310 to cooperate with each other in a one-to-one manner, a plurality of third connection structures 140 and a plurality of fourth connection structures 330 are also provided to cooperate with each other in a one-to-one manner. This further improves the connection strength between the center block 300 and the rotor core 100, and the connection is more stable. Moreover, through the cooperation between the third connection structure 140 and the fourth connection structure 330, the force of the first connection structure 130 and the second connection structure 310 can be effectively shared, thereby reducing the extrusion pressure on the second connection structure 310, and further avoiding deformation of the second connection structure 310.

[0104] The total number of the second connection structures 310 and the fourth connection structures 330 can be the same as the total number of the first permanent magnets 210 and the second permanent magnets 220, so that the number of the second connection structures 310 and the fourth connection structures 330 is large, further improving the connection strength between the center block 300 and the rotor core 100. Of course, the number and position of the second connection structures 310 and the fourth connection structures 330 can also be changed as needed, so that the second connection structures 310 and the fourth connection structures 330 can further improve the connection strength between the center block 300 and the rotor 1.

[0105] Furthermore, the size of the third connection structure 140 in the axial direction of the rotor 1 may be the same as the size of the rotor 1 in the axial direction thereof.

[0106] Furthermore, if Figure 5-Figure 7As shown, the third connection structure 140 is a second connection groove 141 opened on the inner circumference of the rotor core 100, and the second connection groove 141 is connected to the center hole 110; the fourth connection structure 330 is a second matching column 331 arranged on the outer circumference of the center block 300, and the second matching column 331 is matched with the second connection groove 141 to position the rotor core 100 in the radial and circumferential directions of the center block 300.

[0107] In this way, the second matching column 331 can extend into the second connecting groove 141, and the second matching column 331 can stop against the bottom wall of the second connecting groove 141 to limit the center block 300 in the radial direction of the rotor core 100, thereby avoiding radial displacement of the center block 300 and the rotor core 100. At the same time, the second matching column 331 can stop against the side walls of the second connecting groove 141 on the opposite sides of the circumferential direction of the rotor core 100, thereby limiting the center block 300 in the circumferential direction of the rotor core 100, thereby avoiding circumferential relative displacement of the center block 300 and the rotor core 100. The connection and fixation between the center block 300 and the rotor core 100 are more stable and reliable, and the limiting effect is better.

[0108] Furthermore, through the matching of the slot columns, the structures of the third connection structure 140 and the fourth connection structure 330 are simpler, the processing is more convenient and the assembly steps are relatively simple, which is beneficial to the assembly between the center block 300 and the rotor core 100 .

[0109] In some specific embodiments of the present invention, Figure 1 As shown, the second mating column 331 includes a second extending portion 332 and a second reinforcing portion 333 .

[0110] The second extension portion 332 extends outward in the radial direction of the center block 300, and the second extension portion 332 cooperates with the second connecting groove 141 to position the rotor core 100 in the circumferential direction of the center block 300. The second reinforcement portion 333 is connected to the outer end of the second extension portion 332 and is perpendicular to the second extension portion 332. The second reinforcement portion 333 cooperates with the second connecting groove 141 to position the rotor core 100 in the radial direction of the center block 300. The shape of the second connecting groove 141 is adapted to the shape of the second matching column 331.

[0111] Among them, the shape of the second connecting groove 141 is adapted to the shape of the second matching column 331, which means that the shape of the second matching column 331 and the shape of the second extension portion 332 are adapted to the shape of the second reinforcement portion 333, so that the second extension portion 332 and the second reinforcement portion 333 can both extend into the second connecting groove 141, and the second matching column 331 can stop at the second connecting groove 141, thereby limiting and fixing the center block 300 in both radial and circumferential directions.

[0112] It can be understood that the second extension portion 332 extends radially outward along the center block 300, so that both sides of the second extension portion 332 in the width direction can stop at the side walls of the second connecting groove 141, thereby limiting the width direction of the second extension portion 332, that is, limiting the circumferential direction of the center block 300, to avoid relative rotation between the center block 300 and the rotor core 100.

[0113] In addition, the second reinforcement portion 333 is connected to the outer end of the second extension portion 332 and is perpendicular to the second extension portion 332. The second reinforcement portion 333 can increase the contact area between the second matching column 331 and the second connecting groove 141, and the matching is more stable and reliable. The second reinforcement portion 333 and the second extension portion 332 can form a "T"-shaped structure, so that the second reinforcement portion 333 and the second connecting groove 141 can be limited in the radial direction of the center block 300, that is, the center block 300 can be limited in its direction, thereby avoiding relative displacement of the center block 300 and the rotor core 100 in the radial direction of the center block 300, and further improving the assembly stability of the center block 300 and the rotor core 100.

[0114] In some specific embodiments of the present invention, Fig. 9 and Fig.10 As shown, one end of the second reinforcement portion 333 is connected to the second extension portion 332, that is, the second reinforcement portion 333 and the second extension portion 332 can form an "L" shape, which can simplify the structure of the second reinforcement portion 333 and the second extension portion 332, facilitate the connection between the second reinforcement portion 333 and the second extension portion 332, and make processing more convenient.

[0115] In other specific embodiments of the present invention, Fig.11 As shown, the second reinforcement portion 333 is connected to the second extension portion 332 at the center in the length direction, that is, the second reinforcement portion 333 and the second extension portion 332 can form a "T" shape, the connection between the second reinforcement portion 333 and the second extension portion 332 is more reliable, and the extension length of the second reinforcement portion 333 along the circumference of the rotor core 100 can be longer, and the limiting effect is better.

[0116] It should be noted that the length of the second reinforcement portion 333 of the “L”-shaped second matching column 331 can be smaller than the length of the second reinforcement portion 333 of the “T”-shaped second matching column 331. This can improve the structural strength of the “L”-shaped second matching column 331 and avoid damage to the second reinforcement portion 333.

[0117] In some specific embodiments of the present invention, Fig. 9 and Fig.10As shown, the side of the second reinforcement portion 333 facing away from the second extension portion 332 is a plane, and the side of the second reinforcement portion 333 facing the second extension portion 332 is a plane, so that the structure of the second reinforcement portion 333 is simpler and easier to process, and the structure of the second connecting groove 141 at the matching point with the second reinforcement portion 333 can also be relatively simple, that is, the side of the second connecting groove 141 facing the second reinforcement portion 333 and facing away from the second extension portion 332 can also be a plane, which is easier to process.

[0118] In other specific embodiments of the present invention, Fig.11 As shown, the side of the second reinforcing portion 333 facing away from the second extending portion 332 is an outwardly curved arc surface, and the side of the second reinforcing portion 333 facing the second extending portion 332 is a flat surface. In this way, the contact area between the side of the second reinforcing portion 333 facing away from the second extending portion 332 and the second connecting groove 141 is larger, the abutment is more stable, and stress concentration is not likely to occur when the extrusion force between the second reinforcing portion 333 and the second connecting groove 141 is large, thereby further improving the structural strength of the second reinforcing portion 333.

[0119] In some specific embodiments of the present invention, Figure 9-11 As shown, the radial dimension of the second connection structure 310 in the center block 300 is not less than the radial dimension of the fourth connection structure 330 in the center block 300, that is, the radial dimension of the second connection structure 310 in the center block 300 may be greater than or equal to the radial dimension of the fourth connection structure 330 in the center block 300. In this way, the radial dimension of the fourth connection structure 330 in the center block 300 may be smaller, thereby avoiding position interference between the fourth connection structure 330 and the first mounting groove 121 or the second mounting groove 123, and avoiding the fourth connection structure 330 blocking the magnetic circuit between the two adjacent first permanent magnet groups 200, so as to make the magnetic circuit of the rotor 1 unobstructed, thereby avoiding a decrease in torque. Moreover, the smaller dimension along the radial direction of the center block 300 can reduce the stress concentration of the fourth connection structure 330, thereby avoiding deformation of the fourth connection structure 330, and further improving the connection stability between the center block 300 and the rotor core 100.

[0120] Alternatively, the maximum dimension of the second connecting structure 310 in the circumferential direction of the center block 300 is equal to the maximum dimension of the fourth connecting structure 330 in the circumferential direction of the center block 300. This can simplify the structure of the fourth connecting structure 330. On the one hand, it can avoid the width of the fourth connecting structure 330 being too small, thereby improving the structural strength of the fourth connecting structure 330. On the other hand, it can avoid the width of the fourth connecting structure 330 being too large, so that the space occupied by the fourth connecting structure 330 in the circumferential direction of the rotor core 100 will not be too large, thereby facilitating assembly.

[0121] The length of the first extension portion 312 (the dimension of the first extension portion 312 extending approximately along the circumferential direction of the rotor 1) may be the same as the length of the second extension portion 332 (the dimension of the second extension portion 332 extending approximately along the circumferential direction of the rotor 1), and the dimension of the first extension portion 312 in the radial direction of the rotor 1 may be the dimension of the second extension portion 332 in the radial direction of the rotor 1. The length of the first matching column 311 (the dimension of the first matching column 311 extending approximately along the circumferential direction of the rotor 1) may be the same as the length of the second matching column 331 (the dimension of the second matching column 331 extending approximately along the circumferential direction of the rotor 1), and the dimension of the first matching column 311 in the radial direction of the rotor 1 may be greater than the dimension of the second matching column 331 in the radial direction of the rotor 1.

[0122] In some specific embodiments of the present invention, Figure 9-11 As shown, the center block 300 is provided with a plurality of weight-reducing holes 340 arranged at intervals along its circumference. Specifically, the weight-reducing holes 340 can penetrate the center block 300 along the thickness direction of the center block 300, and the plurality of weight-reducing holes 340 are evenly spaced along the circumference of the center block 300, so that the center of gravity of the center block 300 can be located on the central axis of the center block 300, and by providing a plurality of weight-reducing holes 340, the mass of the center block 300 can be reduced, so that the rotor 1 can be suitable for high-speed rotation.

[0123] In addition, each of the lightening holes 340 is located between two adjacent second connection structures 310 or between two adjacent fourth connection structures 330 in the circumferential direction of the central block 300 .

[0124] It can be seen from the above that the radial size of the second connection structure 310 in the center block 300 is not less than the radial size of the fourth connection structure 330 in the center block 300, that is, the size of the second connection structure 310 and the size of the fourth connection structure 330 may be different. This arrangement can make the center block 300 symmetrical about its central axis, and then the center of gravity of the center block 300 can be located on its central axis, avoiding the center of gravity of the rotor 1 from shifting, and facilitating high-speed rotation of the rotor 1.

[0125] In some specific embodiments of the present invention, Fig.11 As shown, the central block 300 has a plurality of first reinforcing ribs 350 , two adjacent weight-reducing holes 340 are separated by the first reinforcing ribs 350 , and the first reinforcing ribs 350 extend radially along the central block 300 and correspond to one position of the second connection structure 310 and the fourth connection structure 330 .

[0126] In this way, by setting the first reinforcing rib 350, the cross-sectional area of ​​a single weight-reducing hole 340 can be prevented from being too large, thereby improving the structural strength of the center block 300 near the weight-reducing hole 340, and the center block 300 is not easily deformed, so that the center block 300 can more reliably support one of the first connecting structure 130 and the fourth connecting structure 330, so that the overall structural strength of the center block 300 is higher.

[0127] In addition, the length of the orthographic projection of the first reinforcing rib 350 on the plane perpendicular to the axial direction of the rotor core 100 is L4, and the difference between the outer diameter and the inner diameter of the center block 300 is L5, wherein 40%≤L4 / L5≤80%. Thus, on the one hand, the length of the first reinforcing rib 350 can be prevented from being too short, that is, the size of the lightening hole 340 along the radial direction of the rotor core 100 can be prevented from being too small, thereby ensuring that the cross-sectional area of ​​the lightening hole 340 is larger and the weight reduction effect is better. On the other hand, the length of the first reinforcing rib 350 can be prevented from being too long, that is, the size of the lightening hole 340 along the radial direction of the rotor core 100 can be prevented from being too large, thereby ensuring that the cross-sectional area of ​​the lightening hole 340 is too large, thereby ensuring the structural strength of the center block 300 and preventing it from being easily deformed.

[0128] In some specific embodiments of the present invention, Fig.11 As shown, the width of the orthographic projection of the first reinforcing rib 350 on a plane perpendicular to the axial direction of the rotor core 100 is not less than twice the minimum width of the orthographic projection of the fourth connecting structure 330 on a plane perpendicular to the axial direction of the rotor core 100. In this way, the width of the first reinforcing rib 350 can be much larger than the width of the fourth connecting structure 330, thereby ensuring that the width of the first reinforcing rib 350 is wide enough, the structural strength of the first reinforcing rib 350 is higher, and the structural strength of the center block 300 is further improved.

[0129] In some specific embodiments of the present invention, Fig.11 As shown, each lightening hole 340 is provided with a second reinforcing rib 360 , which extends in the radial direction of the central block 300 and corresponds to another position of the second connection structure 310 and the fourth connection structure 330 .

[0130] For example, the position of the first reinforcing rib 350 may correspond to the position of the second connection structure 310, and the position of the second reinforcing rib 360 may correspond to the position of the fourth connection structure 330. Alternatively, the position of the first reinforcing rib 350 may correspond to the position of the fourth connection structure 330, and the position of the second reinforcing rib 360 may correspond to the position of the second connection structure 310.

[0131] In this way, by setting the second reinforcing rib 360, the cross-sectional area of ​​a single weight-reducing hole 340 can be prevented from being too large, thereby improving the structural strength of the center block 300 near the weight-reducing hole 340, and the center block 300 is not easily deformed, so that the center block 300 can more reliably support the other of the first connecting structure 130 and the fourth connecting structure 330, so that the overall structural strength of the center block 300 is higher.

[0132] In addition, the length of the orthographic projection of the second reinforcing rib 360 on the plane perpendicular to the axial direction of the rotor core 100 is L6, and the difference between the outer diameter and the inner diameter of the center block 300 is L5, wherein 40%≤L6 / L5≤80%. Thus, on the one hand, the length of the second reinforcing rib 360 can be prevented from being too short, that is, the size of the lightening hole 340 along the radial direction of the rotor core 100 can be prevented from being too small, thereby ensuring that the cross-sectional area of ​​the lightening hole 340 is larger and the weight reduction effect is better. On the other hand, the length of the second reinforcing rib 360 can be prevented from being too long, that is, the size of the lightening hole 340 along the radial direction of the rotor core 100 can be prevented from being too large, thereby ensuring that the cross-sectional area of ​​the lightening hole 340 is too large, thereby ensuring the structural strength of the center block 300 and preventing it from being easily deformed.

[0133] In some specific embodiments of the present invention, Fig.11 As shown, the width of the orthographic projection of the second reinforcing rib 360 on the plane perpendicular to the axial direction of the rotor core 100 is not less than the minimum width of the orthographic projection of the fourth connecting structure 330 on the plane perpendicular to the axial direction of the rotor core 100 and is not greater than the width of the orthographic projection of the first reinforcing rib 350 on the plane perpendicular to the axial direction of the rotor core 100.

[0134] For example, the width of the second reinforcing rib 360 is greater than the width of the fourth connection structure 330 , and the width of the first reinforcing rib 350 is twice the width of the second reinforcing rib 360 .

[0135] In this way, the width of the second reinforcing rib 360 can be much larger than the width of the fourth connecting structure 330 , thereby ensuring that the width of the second reinforcing rib 360 is wide enough, and the structural strength of the second reinforcing rib 360 is higher, further improving the structural strength of the center block 300 .

[0136] In some specific embodiments of the present invention, Figure 1-Figure 3 As shown, the rotor 1 further includes a second permanent magnet group 500 , and the rotor core 100 is further provided with a second installation slot group 150 .

[0137] The second mounting groove group 150 is located outside the first mounting groove group 120 in the radial direction of the rotor core 100. The second mounting groove group 150 includes a third mounting groove 151 and a fourth mounting groove 152 arranged along the circumferential direction of the rotor core 100. The second permanent magnet group 500 includes a third permanent magnet 510 and a fourth permanent magnet 520. The third permanent magnet 510 is installed in the third mounting groove 151, and the fourth permanent magnet 520 is installed in the fourth mounting groove 152.

[0138] The second installation groove group 150 and the first installation groove group 120 may be arranged at intervals along the radial direction of the rotor core 100 to avoid position interference between the second permanent magnet group 500 and the first permanent magnet group 200 .

[0139] Therefore, the third mounting groove 151 can pre-position the third permanent magnet 510 and can fix the third permanent magnet 510, and the fourth mounting groove 152 can pre-position the fourth permanent magnet 520 and can fix the fourth permanent magnet 520, thereby improving the structural strength of the rotor 1, and the third permanent magnet 510 and the fourth permanent magnet 520 can generate a corresponding magnetic field between the third permanent magnet 510 and the fourth permanent magnet 520 through relative direct current, and complete the energy conversion of magnetic energy, kinetic energy and electrical energy through the relative rotation of the rotor 1 and the stator.

[0140] Furthermore, if Figure 1 As shown, the second connecting structure 310 is spaced apart from the second permanent magnet group 500 in the radial direction of the rotor core 100. In this way, interference between the positions of the second connecting structure 310 and the second permanent magnet group 500 is avoided, which facilitates the arrangement of the second permanent magnet group 500 and prevents the second connecting structure 310 from blocking the magnetic circuit between the second permanent magnet group 500 and the first permanent magnet group 200, so that the rotor 1 can rotate normally.

[0141] Furthermore, if Figure 5 and Figure 8 As shown, the maximum distance between the first mounting slot group 120 and the second mounting slot group 150 in the radial direction of the rotor core 100 is L7, the line connecting the two closest points on the adjacent side walls of the first mounting slot 121 and the second mounting slot 123 is defined as an imaginary line 400, and the dimension of the first extension portion 312 that extends radially outward from the imaginary line 400 along the rotor core 100 is L3, and L3 / L7≤50%.

[0142] In this way, interference between the positions of the second connecting structure 310 and the second permanent magnet group 500 can be more effectively avoided. The distance between the second connecting structure 310 and the second mounting slot group 150 is large, which is convenient for the arrangement of the second permanent magnet group 500. At the same time, the second connecting structure 310 is avoided from blocking the magnetic circuit between the second permanent magnet group 500 and the first permanent magnet group 200, so that the rotor 1 can rotate normally.

[0143] In some specific embodiments of the present invention, Figure 1 As shown, the spacing between the first permanent magnet 210 and the second permanent magnet 220 gradually increases radially outwardly along the rotor core 100, the spacing between the third permanent magnet 510 and the fourth permanent magnet 520 gradually increases radially outwardly along the rotor core 100, and the angle between the first permanent magnet 210 and the fourth permanent magnet 520 is smaller than the angle between the third permanent magnet 510 and the fourth permanent magnet 520.

[0144] The first permanent magnet group 200 is line-symmetrical about a preset radius, the second permanent magnet group 500 is line-symmetrical about a preset radius, and the third permanent magnet 510 and the fourth permanent magnet 520 are located between the first permanent magnet 210 and the second permanent magnet 220 in the circumferential direction of the rotor 1 .

[0145] That is, the first permanent magnet 210 and the second permanent magnet 220 are configured to form a "V"-shaped first permanent magnet group 200, and the third permanent magnet 510 and the fourth permanent magnet 520 are configured to form a "V"-shaped second permanent magnet group 500. Compared with the rotor of the "I"-shaped permanent magnet, the permanent magnet arrangement structure of the embodiment of the present invention changes the deformation distribution of the outer diameter surface of the rotor 1, so that the maximum centrifugal stress point of the first permanent magnet group 200 is transferred to between the first mounting groove 121 and the second mounting groove 123, and the maximum centrifugal stress point of the second permanent magnet group 500 is transferred to between the third mounting groove 151 and the fourth mounting groove 152. Among them, the nature of the maximum centrifugal stress is tensile stress, which is restricted by the tensile strength of the rotor core 100 material. Since the tensile strength of the rotor core 100 material is greater than the yield strength, the mechanical properties of the rotor 1 at high speed are also significantly enhanced.

[0146] In some specific embodiments of the present invention, the second connecting structure 310 is a non-magnetic conductive part integrally formed with the central block 300, and the second connecting structure 310 extends between the first permanent magnet 210 and the second permanent magnet 220, wherein the second connecting structure 310 can be integrally die-cast with the central block 300.

[0147] In this way, the second connecting structure 310 can separate the first permanent magnet 210 and the second permanent magnet 220 in the circumferential direction of the rotor core 100. The second connecting structure 310 can not only be used to connect and fix the center block 300 and the rotor core 100, but also can be used to separate the magnetic force between the first permanent magnet 210 and the second permanent magnet 220, thereby playing a magnetic isolation role, improving the magnetic isolation effect of the rotor 1, and helping to reduce the magnetic leakage of the rotor 1.

[0148] Moreover, by constructing the second connecting structure 310 and the center block 300 as an integral part, the overall structural strength and rigidity of the center block 300 can be improved, and the second connecting structure 310 has a stronger load-bearing capacity. When the rotor 1 rotates at high speed, the second connecting structure 310 can withstand a larger centrifugal force, thereby avoiding deformation of the second connecting structure 310, further reducing the risk of breakage and failure of the second connecting structure 310, and the connection between the center block 300 and the rotor core 100 is more reliable and the magnetic isolation effect of the rotor 1 is also more reliable. The rotor 1 is more suitable for high-speed rotation, thereby increasing the service life of the motor.

[0149] In some specific embodiments of the present invention, the central axis of the shaft hole 320, the central axis of the center block 300 and the central axis of the rotor core 100 coincide with each other. In this way, the center of gravity of the shaft, the center of gravity of the center block 300 and the center of gravity of the rotor core 100 can coincide with each other, avoiding the deviation of the center of gravity of the rotor 1 as a whole and the center of gravity of the shaft, so that the rotor 1 and the shaft can adapt to high-speed rotation.

[0150] The following describes a motor according to an embodiment of the present invention with reference to the accompanying drawings. The motor includes a rotor 1 according to the above-mentioned embodiment of the present invention.

[0151] The motor according to the embodiment of the present invention can avoid magnetic leakage of the rotor 1 by utilizing the rotor 1 according to the above embodiment of the present invention, and has the advantages of good magnetic isolation effect and high structural strength.

[0152] In some specific embodiments of the present invention, Figure 1 As shown, the number P of the first permanent magnet groups 200 is an even number, and the first permanent magnet groups 200 on two opposite sides of the rotor core 100 in the radial direction constitute a rotor pole pair.

[0153] Furthermore, the number P of the first permanent magnet groups 200 is equal to the number of the second connecting structures 310, so that multiple first permanent magnet groups 200 can correspond one-to-one to multiple second connecting structures 310, and each second connecting structure 310 can separate the first permanent magnet 210 and the second permanent magnet 220 of the corresponding first permanent magnet group 200.

[0154] In some specific embodiments of the present invention, Figure 1As shown, the central angle corresponding to each second connection structure 310 is less than 90° / P, that is, the central angle corresponding to each second connection structure 310 is less than 360° / 4P, thereby avoiding the central angle corresponding to the second connection structure 310 being too large, that is, avoiding the second connection structure 310 from extending too long in the circumferential direction of the center block 300, and there is enough space between adjacent second connection structures 310 to arrange the fourth connection structure 330, thereby avoiding interference between adjacent second connection structures 310 and fourth connection structures 330, and also avoiding interference between the fourth connection structure 330 and the inner layer mounting groove, which is convenient for arrangement.

[0155] A vehicle according to an embodiment of the present invention will be described below with reference to the accompanying drawings. The vehicle includes a motor according to the above-described embodiment of the present invention.

[0156] The vehicle according to the embodiment of the present invention can avoid magnetic leakage of the rotor 1 by utilizing the motor according to the above embodiment of the present invention, and has the advantages of good magnetic isolation effect and high structural strength.

[0157] Other structures and operations of the rotor 1, the motor and the vehicle according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0158] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0159] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A rotor, characterized in that: include: A rotor core, the rotor core is configured in an annular shape and surrounds a central hole, the rotor core is provided with a first mounting groove group and a first connecting structure, the first mounting groove group includes a first mounting groove and a second mounting groove arranged along the circumference of the rotor core; A first permanent magnet group, the first permanent magnet group includes a first permanent magnet and a second permanent magnet, the first permanent magnet is installed in the first installation groove, and the second permanent magnet is installed in the second installation groove; A center block, the center block is assembled in the center hole of the rotor core, the center block is provided with a second connection structure and a shaft hole, the second connection structure is a non-magnetic conductive part and cooperates with the first connection structure, and the second connection structure extends between the first permanent magnet and the second permanent magnet to separate the first permanent magnet and the second permanent magnet; A rotating shaft, the rotating shaft is matched with the rotating shaft hole and rotates synchronously with the center block and the rotor core; The first connection structure is a first connection groove provided on the inner circumference of the rotor core, the first connection groove is communicated with the center hole, and the second connection structure is a first matching column provided on the outer circumference of the center block, the first matching column is matched with the first connection groove to position the rotor core in the radial direction and the circumferential direction of the center block; The first matching column comprises: a first extension portion, the first extension portion extending outwardly in the radial direction of the center block to between the first permanent magnet and the second permanent magnet, the first extension portion cooperating with the first connecting groove to position the rotor core in the circumferential direction of the center block; a first reinforcement portion, the first reinforcement portion being connected to an outer end of the first extension portion and being perpendicular to the first extension portion, the first reinforcement portion being matched with the first connection groove to position the rotor core in a radial direction of the center block; Wherein, the shape of the first connecting groove is adapted to the shape of the first matching column.

2. The rotor according to claim 1, characterized in that The first connecting groove is communicated with the first mounting groove and the second mounting groove respectively, and the first matching column is spaced apart from the first permanent magnet and the second permanent magnet respectively.

3. The rotor according to claim 2, characterized in that A first stop block is configured on an inner wall of the first installation slot at one end adjacent to the first connecting slot, and the first stop block stops the first permanent magnet so as to separate the first permanent magnet from the first matching column; A second stopping block is configured on an inner wall of the second installation slot at one end adjacent to the first connecting slot, and the second stopping block stops the second permanent magnet to separate the second permanent magnet from the first matching column.

4. The rotor according to claim 1, characterized in that The length of the orthographic projection of the first reinforcement portion on a plane perpendicular to the axial direction of the rotor core is not less than 2 mm, and the width of the orthographic projection of the first reinforcement portion on a plane perpendicular to the axial direction of the rotor core is not less than 1 mm.

5. The rotor according to claim 1, characterized in that The width of the orthographic projection of the first extension portion on a plane perpendicular to the axial direction of the rotor core is L1, and the size of the first permanent magnet group in the axial direction of the rotor core is L2, wherein 10%≤L1 / L2≤50%; The line connecting the two closest points on the adjacent side walls of the first installation groove and the second installation groove is defined as an imaginary line, and the dimension L3 of the first extension portion extending outwardly from the imaginary line in the radial direction of the rotor core is not less than 1 mm.

6. The rotor according to claim 1, characterized in that One end of the first reinforcement portion is connected to the first extension portion; or The first reinforcing portion is connected to the first extending portion at a center in a longitudinal direction thereof.

7. The rotor according to claim 1, characterized in that A side of the first reinforcing portion facing away from the first extending portion is a plane, and a side of the first reinforcing portion facing the first extending portion is a plane; or A side of the first reinforcing portion facing away from the first extending portion is an outwardly curved surface, and a side of the first reinforcing portion facing the first extending portion is a flat surface.

8. The rotor according to claim 1, characterized in that The first installation groove group and the first connection structure are both arranged in a plurality at intervals along the circumferential direction of the rotor core; There are a plurality of first permanent magnet groups and they are installed in a plurality of first installation slot groups in a one-to-one correspondence, and there are a plurality of second connection structures and they are matched with a plurality of first connection structures in a one-to-one correspondence; The first permanent magnet and the second permanent magnet of each of the first permanent magnet groups are separated by the corresponding second connecting structure.

9. The rotor according to claim 8, characterized in that The rotor core is provided with a plurality of third connection structures, wherein the plurality of first connection structures and the plurality of third connection structures are spaced and alternately arranged along the circumferential direction of the rotor core, and each of the third connection structures is located between two adjacent first permanent magnet groups in the circumferential direction of the rotor core; The central block is provided with a plurality of fourth connection structures, the plurality of second connection structures and the plurality of fourth connection structures are spaced and alternately arranged along the circumference of the central block, and the plurality of fourth connection structures are matched with the plurality of third connection structures in a one-to-one correspondence.

10. The rotor according to claim 9, characterized in that The third connection structure is a second connection groove formed on the inner circumference of the rotor core, and the second connection groove is connected to the center hole; The fourth connection structure is a second matching column provided on the outer peripheral surface of the center block, and the second matching column is matched with the second connection groove to position the rotor core in the radial direction and the circumferential direction of the center block.

11. The rotor according to claim 10, characterized in that The second coordination column comprises: a second extension portion, the second extension portion extending outwardly in the radial direction of the center block, the second extension portion being matched with the second connecting groove to position the rotor core in the circumferential direction of the center block; a second reinforcement portion, the second reinforcement portion being connected to an outer end of the second extension portion and being perpendicular to the second extension portion, the second reinforcement portion being matched with the second connection groove to position the rotor core in a radial direction of the center block; Wherein, the shape of the second connecting groove is adapted to the shape of the second matching column.

12. The rotor according to claim 11, characterized in that One end of the second reinforcement portion is connected to the second extension portion; or The center of the second reinforcement portion in the longitudinal direction is connected to the second extension portion.

13. The rotor according to claim 11, characterized in that A side of the second reinforcing portion facing away from the second extending portion is a plane, and a side of the second reinforcing portion facing the second extending portion is a plane; or A side of the second reinforcing portion facing away from the second extending portion is an outwardly curved arc surface, and a side of the second reinforcing portion facing the second extending portion is a flat surface.

14. The rotor according to claim 10, characterized in that The dimension of the second connection structure in the radial direction of the central block is not less than the dimension of the fourth connection structure in the radial direction of the central block; and / or A maximum dimension of the second connection structure in the circumferential direction of the central block is equal to a maximum dimension of the fourth connection structure in the circumferential direction of the central block.

15. The rotor according to claim 9, characterized in that The central block is provided with a plurality of weight-reducing holes spaced apart along its circumference; Wherein, each of the weight-reducing holes is located between two adjacent second connection structures or between two adjacent fourth connection structures in the circumferential direction of the central block.

16. The rotor according to claim 15, characterized in that The central block has a plurality of first reinforcing ribs, two adjacent weight-reducing holes are separated by the first reinforcing ribs, the first reinforcing ribs extend along the radial direction of the central block and correspond to one position of the second connection structure and the fourth connection structure; The length of the orthographic projection of the first reinforcing rib on a plane perpendicular to the axial direction of the rotor core is L4, and the difference between the outer diameter and the inner diameter of the center block is L5, wherein 40%≤L4 / L5≤80%; and / or The width of the orthographic projection of the first reinforcing rib on a plane perpendicular to the axial direction of the rotor core is not less than twice the minimum width of the orthographic projection of the fourth connecting structure on a plane perpendicular to the axial direction of the rotor core.

17. The rotor according to claim 16, characterized in that Each of the weight-reducing holes is provided with a second reinforcing rib, the second reinforcing rib extending in the radial direction of the central block and corresponding to another position of the second connecting structure and the fourth connecting structure; The length of the orthographic projection of the second reinforcing rib on a plane perpendicular to the axial direction of the rotor core is L6, and the difference between the outer diameter and the inner diameter of the center block is L5, wherein 40%≤L6 / L5≤80%; and / or The width of the orthographic projection of the second reinforcing rib on a plane perpendicular to the axial direction of the rotor core is not less than the minimum width of the orthographic projection of the fourth connecting structure on a plane perpendicular to the axial direction of the rotor core and is not greater than the width of the orthographic projection of the first reinforcing rib on a plane perpendicular to the axial direction of the rotor core.

18. The rotor according to claim 1, characterized in that Also includes: A second permanent magnet group, the rotor core is also provided with a second mounting groove group, the second mounting groove group is located on the outside of the first mounting groove group in the radial direction of the rotor core, the second mounting groove group includes a third mounting groove and a fourth mounting groove arranged along the circumferential direction of the rotor core, the second permanent magnet group includes a third permanent magnet and a fourth permanent magnet, the third permanent magnet is installed in the third mounting groove, and the fourth permanent magnet is installed in the fourth mounting groove.

19. The rotor according to claim 18, characterized in that The second connection structure is disposed spaced apart from the second permanent magnet group in the radial direction of the rotor core.

20. The rotor according to claim 19, characterized in that The maximum distance between the first mounting slot group and the second mounting slot group in the radial direction of the rotor core is L7, and the line connecting the two closest points on the adjacent side walls of the first mounting slot and the second mounting slot is defined as an imaginary line. The dimension of the first extension portion extending outward along the radial direction of the rotor core beyond the imaginary line is L3, and L3 / L7≤50%.

21. The rotor according to claim 18, characterized in that The distance between the first permanent magnet and the second permanent magnet gradually increases outward along the radial direction of the rotor core, and the distance between the third permanent magnet and the fourth permanent magnet gradually increases outward along the radial direction of the rotor core; Wherein, the angle between the first permanent magnet and the fourth permanent magnet is smaller than the angle between the third permanent magnet and the fourth permanent magnet; The first permanent magnet group is line-symmetrical about a preset radius, and the second permanent magnet group is line-symmetrical about the preset radius.

22. A rotor according to any one of claims 1 to 21, characterized in that The second connection structure is a non-magnetic conductive part formed integrally with the central block.

23. A rotor according to any one of claims 1 to 21, characterized in that The rotor core includes a plurality of rotor punches which are stacked and each of which is configured as an annular integral member.

24. A rotor according to any one of claims 1 to 21, characterized in that The central axis of the rotating shaft hole, the central axis of the central block and the central axis of the rotor core coincide with each other.

25. A motor, characterized in that: Comprising a rotor according to any one of claims 1-24.

26. The electric machine according to claim 25, characterized in that The number P of the first permanent magnet groups is an even number and is equal to the number of the second connecting structures.

27. The electric machine according to claim 26, characterized in that The central angle corresponding to each of the second connection structures is smaller than 90° / P.

28. A vehicle, characterized in that Comprising an electric machine according to any one of claims 25-27.

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