Motor rotor, motor and vehicle

Abstract

The invention relates to a motor rotor, a motor and a vehicle, the motor rotor comprises a rotor iron core and a magnetic assembly, and the rotor iron core comprises a first magnetic slot extending along the axial direction of the rotor iron core; the magnetic assembly is arranged in the first magnetic groove, the magnetic assembly comprises first permanent magnets and second permanent magnets, the residual magnetism of the first permanent magnets is larger than that of the second permanent magnets, and at least one first permanent magnet is closer to the peripheral surface of the rotor core than the second permanent magnets. According to the embodiment of the invention, the first permanent magnets and the second permanent magnets with different residual magnetisms are arranged in the magnetic slots of the rotor core, the first permanent magnets with larger residual magnetisms and higher cost are closer to the peripheral surface of the rotor core, and the second permanent magnets with lower residual magnetisms and lower cost are farther away from the peripheral surface of the rotor core than the first permanent magnets. Therefore, more magnetic flux of the magnetic assembly can smoothly pass through the air gap of the motor, the magnetic flux of the motor passing through the air gap is basically unchanged, the torque of the motor is maintained, and the overall cost of the magnetic assembly is reduced.

Description

Technical Field

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

[0002] In the related art, the rotor of a motor used in a vehicle usually adopts an inner-inserted permanent magnet structure. By arranging the permanent magnets of the rotor in a certain way, a larger magnetic flux is formed so that the rotor of the motor can generate a larger torque.

[0003] However, in order to ensure that the rotor of the motor can reach a predetermined torque, a large number of permanent magnets with high remanence are often arranged in the rotor of the motor so that the magnetic flux passing through the air gap of the motor meets the requirements. This will increase the cost of the permanent magnets and thus increase the cost of the motor. Summary of the Invention

[0004] The embodiments of the present application provide a motor rotor, a motor and a vehicle, which reduce the cost of the permanent magnets of the motor rotor while keeping the torque of the motor rotor basically unchanged, so as to at least partially solve the above technical problems.

[0005] To achieve the above object, according to the first aspect of the present application, a motor rotor is provided, including: A rotor core including a first magnetic slot extending along its axial direction; A magnetic component disposed in the first magnetic slot. The magnetic component includes a first permanent magnet and a second permanent magnet. The remanence of the first permanent magnet is greater than that of the second permanent magnet, and at least one of the first permanent magnets is closer to the outer peripheral surface of the rotor core than the second permanent magnet.

[0006] Optionally, the second permanent magnet is closer to the central axis of the rotor core than at least one of the first permanent magnets.

[0007] Optionally, the rotor core includes a plurality of magnetic slot units sequentially distributed along its circumferential direction. Each magnetic slot unit includes at least two of the first magnetic slots, and the magnetic components are respectively disposed in at least two of the first magnetic slots of the magnetic slot unit.

[0008] Optionally, at least two of the first magnetic slots of the magnetic slot unit are sequentially distributed along the circumferential direction of the rotor core.

[0009] Optionally, in the direction from the outer peripheral surface of the rotor core to the central axis, the distance between two adjacent first magnetic slots of the magnetic slot unit gradually decreases.

[0010] Optionally, the magnetic slot unit further includes a second magnetic slot, in which a third permanent magnet is provided. The remanence of the third permanent magnet is greater than that of the second permanent magnet, and the third permanent magnet is closer to the outer peripheral surface of the rotor core than the second permanent magnet.

[0011] Optionally, the second magnetic slot of the magnetic slot unit is located between the two first magnetic slots.

[0012] Optionally, the magnetic slot unit further includes a third magnetic slot, in which a fourth permanent magnet is provided. The remanence of the fourth permanent magnet is less than that of the first permanent magnet, and the first permanent magnet is closer to the outer peripheral surface of the rotor core than the fourth permanent magnet.

[0013] Optionally, the third magnetic slot of the magnetic slot unit is located between the two first magnetic slots.

[0014] Optionally, the sum of the widths of the first permanent magnet and the third permanent magnet is L1, and the sum of the widths of the second permanent magnet and the fourth permanent magnet is L2, where 0.8 ≤ L1 / L2 ≤ 1.5.

[0015] Optionally, the magnetic component includes two first permanent magnets, and the second permanent magnet is located between the two first permanent magnets.

[0016] Optionally, the first permanent magnet and / or the second permanent magnet satisfy: 0.2 ≤ 360 / (5×P×D×(L / W)×sinθ) ≤ 6.5; where L is the width of the first permanent magnet or the second permanent magnet, W is the thickness of the first permanent magnet or the second permanent magnet, θ is the included angle between the placement direction of the first permanent magnet or the second permanent magnet and the d-axis of the motor rotor, P is the number of poles of the motor rotor, and D is the outer diameter of the rotor core.

[0017] Optionally, the first permanent magnet includes at least one first sub-magnet and at least one second sub-magnet arranged along the axial direction of the rotor core, and the remanence of the first sub-magnet is different from that of the second sub-magnet; and / or, the second permanent magnet includes at least one first sub-magnet and at least one second sub-magnet arranged along the axial direction of the rotor core, and the remanence of the first sub-magnet is different from that of the second sub-magnet.

[0018] Optionally, the magnetic component satisfies: 0.5 ≤ H1 / H2 ≤ 1.2, where H1 is the sum of the lengths of the multiple first sub-magnets of the magnetic component in the axial direction of the rotor core; H2 is the sum of the lengths of the multiple second sub-magnets of the magnetic component in the axial direction of the rotor core.

[0019] According to a second aspect of the present application, there is provided an electric motor including the electric motor rotor as described above, and the electric motor rotor includes: a rotor core including a first magnetic slot extending along its axial direction; a magnetic component disposed in the first magnetic slot, the magnetic component including a first permanent magnet and a second permanent magnet, the remanence of the first permanent magnet being greater than that of the second permanent magnet, and at least one of the first permanent magnets being closer to the outer peripheral surface of the rotor core than the second permanent magnet.

[0020] According to a third aspect of the present application, there is also provided a vehicle including the electric motor as described above.

[0021] In the electric motor rotor provided by the embodiments of the present application, by arranging a first permanent magnet and a second permanent magnet with different remanences in the magnetic slot of the rotor core, and making the first permanent magnet with a greater remanence and a higher cost closer to the outer peripheral surface of the rotor core, while the second permanent magnet with a lower remanence and a lower cost is farther from the outer peripheral surface of the rotor core than the first permanent magnet, more magnetic fluxes of the magnetic component can smoothly pass through the air gap of the electric motor, so that the magnetic flux passing through the air gap of the electric motor is basically unchanged to maintain the torque of the electric motor, while being beneficial to reducing the overall cost of the magnetic component.

[0022] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. Description of the Drawings In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application, and those skilled in the art can obtain other drawings without creative efforts based on these drawings.

[0023] In order to more comprehensively understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0024] Figure 1 An axial view of an embodiment of the electric motor rotor provided by the embodiments of the present application; Figure 2 An axial sectional view of the first embodiment of the electric motor rotor provided by the embodiments of the present application; Figure 3 An axial sectional view of the second embodiment of the electric motor rotor provided by the embodiments of the present application; Figure 4 An axial sectional view of the third embodiment of the electric motor rotor provided by the embodiments of the present application; Figure 5Axial view of the first embodiment of the magnetic slot unit provided by the embodiment of the present application; Figure 6 Axial view of the second embodiment of the magnetic slot unit provided by the embodiment of the present application; Figure 7 Axial view of the third embodiment of the magnetic slot unit provided by the embodiment of the present application; Figure 8 Axial view of the fourth embodiment of the magnetic slot unit provided by the embodiment of the present application; Figure 9 Axial view of the fifth embodiment of the magnetic slot unit provided by the embodiment of the present application; Figure 10 Axial view of the sixth embodiment of the magnetic slot unit provided by the embodiment of the present application.

[0025] Explanation of reference numerals: Motor rotor 1; Rotor core 10; Outer peripheral surface 101; Magnetic slot unit 11; First magnetic slot 111; First end 1111; Second end 1112; First slot section 1113; Second slot section 1114; Second magnetic slot 112; Third magnetic slot 113; Fourth magnetic slot 114; Oil guiding groove 115; Magnetic component 20; First permanent magnet 21; Second permanent magnet 22; First sub-magnet 201; Second sub-magnet 202; Third permanent magnet 23; Fourth permanent magnet 24; Fifth permanent magnet 25; Sixth permanent magnet 26; Central axis X. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0027] The embodiment of the present application provides a motor rotor, a motor and a vehicle. The following will be described in detail respectively.

[0028] Figure 1 Axial view of an embodiment of the motor rotor provided by the embodiment of the present application. As Figure 1 shown, the motor rotor 1 includes a rotor core 10 and a magnetic component 20. The rotor core 10 includes a first magnetic slot 111 extending along its axial direction. The magnetic component 20 is disposed in the first magnetic slot 111.

[0029] Among them, the magnetic component 20 can include a first permanent magnet 21 and a second permanent magnet 22. The remanence of the first permanent magnet 21 is greater than that of the second permanent magnet 22. At least one first permanent magnet 21 is closer to the outer peripheral surface 101 of the rotor core 10 than the second permanent magnet 22, so that the minimum distance from at least one first permanent magnet 21 to the outer peripheral surface 101 of the rotor core 10 is less than the minimum distance from the second permanent magnet 22 to the outer peripheral surface 101 of the rotor core 10.

[0030] In the motor rotor 1 provided by the embodiment of the present application, by arranging the first permanent magnet 21 and the second permanent magnet 22 with different remanences in the first magnetic slot 111 of the rotor core 10, and making the first permanent magnet 21 with greater remanence and higher cost closer to the outer peripheral surface 101 of the rotor core 10, while the second permanent magnet 22 with lower remanence and lower cost is farther from the outer peripheral surface 101 of the rotor core 10 than the first permanent magnet 21, more magnetic flux of the magnetic component 20 can smoothly pass through the air gap of the motor, so that the magnetic flux passing through the air gap of the motor is basically unchanged to maintain the torque of the motor, and at the same time, the magnetic flux utilization rate of the magnetic component 20 is higher, which is beneficial to reducing the overall cost of the magnetic component 20.

[0031] It should be noted that when the magnetic component 20 includes a plurality of first permanent magnets 21, one first permanent magnet 21 can be closer to the outer peripheral surface 101 of the rotor core 10 than the second permanent magnet 22, or two or more first permanent magnets 21 can be closer to the outer peripheral surface 101 of the rotor core 10 than the second permanent magnet 22.

[0032] For example Figure 5 As shown, the magnetic component 20 includes two first permanent magnets 21 and a second permanent magnet 22, and the second permanent magnet 22 is located between the two first permanent magnets 21. Or, as Figure 7 shown, the magnetic component 20 includes two first permanent magnets 21 and one second permanent magnet 22, and both of the two first permanent magnets 21 are located on the side of the second permanent magnet 22 close to the outer peripheral surface 101 of the rotor core 10, so that the two first permanent magnets 21 are closer to the outer peripheral surface 101 of the rotor core 10 than the second permanent magnet 22.

[0033] In some embodiments, as Figure 1 and Figure 2 shown, the second permanent magnet 22 can be closer to the central axis X of the rotor core 10 than at least one first permanent magnet 21. Thus, the first permanent magnet 21 with greater remanence can be closer to the outer peripheral surface 101 of the rotor core 10, which is beneficial to further improving the magnetic flux utilization rate of the magnetic component 20.

[0034] Specifically, the first magnetic slot 111 includes a first end 1111 close to the outer peripheral surface 101 of the rotor core 10 and a second end 1112 close to the central axis X of the rotor core 10. The first permanent magnet 21 and the second permanent magnet 22 in the first magnetic slot 111 are sequentially distributed along the direction from the first end 1111 to the second end 1112. The width direction of the first permanent magnet 21 and the second permanent magnet 22 is substantially parallel to the direction from the first end 1111 to the second end 1112 of the first magnetic slot 111. The height direction of the first permanent magnet 21 and the second permanent magnet 22 is perpendicular to the direction from the first end 1111 to the second end 1112 of the first magnetic slot 111 and perpendicular to the axial direction of the rotor core 10.

[0035] In some embodiments, as Figure 1 shown, the rotor core 10 includes a plurality of magnetic slot units 11 sequentially distributed along its circumferential direction. Each magnetic slot unit 11 includes at least one first magnetic slot 111, and a magnetic component 20 is provided in the first magnetic slot 111. Thereby, the magnetic flux utilization rate of the magnetic component 20 in the rotor core 10 can be further improved, and thus the cost of the motor rotor 1 can be further reduced.

[0036] Among them, each magnetic unit can include at least two first magnetic slots 111, and magnetic components 20 are respectively provided in at least two first magnetic slots 111 of the magnetic slot unit 11, so as to further improve the magnetic flux utilization rate of the magnetic component 20 in the rotor core 10, and thus further reduce the cost of the motor rotor 1.

[0037] In some embodiments, at least two first magnetic slots 111 of the magnetic slot unit 11 can be sequentially distributed along the circumferential direction of the rotor core 10, so that the magnetic flux distribution of the motor rotor 1 is more uniform, which is beneficial to improving the working stability of the motor.

[0038] Among them, in the direction from the outer peripheral surface 101 to the central axis X of the rotor core 10, the distance between two adjacent first magnetic slots 111 of the magnetic slot unit 11 gradually decreases. Thereby, the distribution position of the first magnetic slot 111 can be adapted to the shape of the rotor core 10, which is beneficial to increasing the width of the first magnetic slot 111 as much as possible to accommodate as many magnetic components 20 as possible.

[0039] It can be understood that since the diameter of the part of the rotor core 10 closer to the central axis X is smaller, by making the distance between two adjacent first magnetic slots 111 gradually decrease in the direction from the outer peripheral surface 101 to the central axis X of the rotor core 10, while the first magnetic slot 111 has a larger width, the first magnetic slots 111 of two adjacent magnetic slot units 11 will not interfere with each other.

[0040] Specifically, the magnetic slot unit 11 includes two first magnetic slots 111. The first magnetic slots 111 of the magnetic slot unit 11 extend in a straight line from the first end 1111 to the second end 1112. The distance between the first ends 1111 of the two first magnetic slots 111 of the magnetic slot unit 11 is greater than the distance between the second ends 1112 of the two first magnetic slots 111. The distances from the first ends 1111 of the two first magnetic slots 111 of the magnetic slot unit 11 to the central axis X of the rotor core 10 are equal. The distances from the second ends 1112 of the two first magnetic slots 111 of the magnetic slot unit 11 to the central axis X of the rotor core 10 are equal. The two first magnetic slots 111 of the magnetic slot unit 11 are symmetrically distributed. The central axis X of the motor rotor 1 is located on the symmetry plane of the two first magnetic slots 111 of the magnetic slot unit 11.

[0041] In other embodiments, as Figure 8 shown, the first magnetic slot 111 of the magnetic slot unit 11 may include a first slot section 1113 extending from the first end 1111 to the second end 1112, and a second slot section 1114 extending from the first slot section 1113 to the second end 1112. The first slot section 1113 extends in a straight line, and the second slot section 1114 extends in a curve. The distance between the second slot sections 1114 of the two first magnetic slots 111 of the magnetic slot unit 11 gradually decreases in the direction from the outer peripheral surface 101 of the rotor core 10 to the central axis X.

[0042] Among them, the first permanent magnet 21 may be disposed in the first slot section 1113 and adapted to the shape of the first slot section 1113. The second permanent magnet 22 is disposed in the second slot section 1114 and adapted to the shape of the second slot section 1114.

[0043] Or, as Figure 7 shown, the magnetic component 20 may include a plurality of first permanent magnets 21, and the plurality of first permanent magnets 21 of the magnetic component 20 are disposed in the first slot section 1113 of the first magnetic slot 111 and are sequentially distributed along the direction from the first end 1111 to the second end 1112 of the first magnetic slot 111.

[0044] In some embodiments, as Figure 3 shown, the first permanent magnet 21 may include at least one first sub-magnet 201 and at least one second sub-magnet 202 arranged along the axial direction of the rotor core 10, and the remanence of the first sub-magnet 201 is different from the remanence of the second sub-magnet 202. Thus, by adjusting the number or size of the first sub-magnets 201 and the second sub-magnets 202 of the first permanent magnet 21, the remanence of the first permanent magnet 21 can be adjusted to make the remanence of the first permanent magnet 21 more reasonable, which is beneficial to reducing the cost of the first permanent magnet 21. Among them, the remanence of the first sub-magnet 201 may be greater than the remanence of the second sub-magnet 202, or may be less than the remanence of the second sub-magnet 202.

[0045] Similarly, the second permanent magnet 22 can include at least one first sub-magnet 201 and at least one second sub-magnet 202 arranged along the axial direction of the rotor core 10, and the remanence of the first sub-magnet 201 is different from that of the second sub-magnet 202. Thus, by adjusting the number or size of the first sub-magnet 201 and the second sub-magnet 202 of the second permanent magnet 22, the remanence of the second permanent magnet 22 can be adjusted to make the remanence of the second permanent magnet 22 more reasonable, which is beneficial to reducing the cost of the second permanent magnet 22.

[0046] It should be noted that both the first permanent magnet 21 and the second permanent magnet 22 can include at least one first sub-magnet 201 and at least one second sub-magnet 202, or one of the first permanent magnet 21 and the second permanent magnet 22 can include at least one first sub-magnet 201 and at least one second sub-magnet 202. Of course, the latter can make the adjustment of the remanence of the first permanent magnet 21 and the second permanent magnet 22 more flexible.

[0047] In some embodiments, the magnetic assembly 20 can include two first permanent magnets 21, and the second permanent magnet 22 is located between the two first permanent magnets 21. Among them, the two first permanent magnets 21 can be closer to the outer peripheral surface 101 of the rotor core 10 than the second permanent magnet 22, so as to further improve the magnetic flux utilization rate of the magnetic assembly 20 in the rotor core 10 while reducing the cost of the motor rotor 1. Of course, one of the first permanent magnets 21 can also be located on the side of the second permanent magnet 22 close to the outer peripheral surface 101 of the rotor core 10, and the other first permanent magnet 21 can be located on the side of the second permanent magnet 22 close to the central axis X of the rotor core 10.

[0048] In some embodiments, the remanence of the first sub-magnet 201 can be greater than that of the second sub-magnet 202. Moreover, the magnetic assembly 20 satisfies: 0.5 ≤ H1 / H2 ≤ 1.2, where H1 is the sum of the lengths of the multiple first sub-magnets 201 of the magnetic assembly 20 in the axial direction of the rotor core 10; H2 is the sum of the lengths of the multiple second sub-magnets 202 of the magnetic assembly 20 in the axial direction of the rotor core 10, so that while the motor rotor 1 has more magnetic flux passing through the air gap of the motor, the cost of the magnetic assembly 20 can be reduced as much as possible.

[0049] It should be noted that when both the first permanent magnet 21 and the second permanent magnet 22 include at least one first sub-magnet 201 and at least one second sub-magnet 202, H1 is the sum of the lengths of the multiple first sub-magnets 201 of the first permanent magnet 21 and the second permanent magnet 22 in the axial direction of the rotor core 10, and H2 is the sum of the lengths of the multiple second sub-magnets 202 of the first permanent magnet 21 and the second permanent magnet 22 in the axial direction of the rotor core 10. The ratio of H1 to H2 can be 0.6, 0.7, 0.8, 0.9, 1, etc.

[0050] Specifically, for example, the first permanent magnet 21 includes two first sub-magnets 201 and one second sub-magnet 202, and the second sub-magnet 202 of the first permanent magnet 21 is located between the two first sub-magnets 201. The second permanent magnet 22 includes two first sub-magnets 201 and two second sub-magnets 202, and the two first sub-magnets 201 and the two second sub-magnets 202 of the second permanent magnet 22 are alternately distributed in the axial direction of the rotor core 10.

[0051] Among them, the lengths of the two first sub-magnets 201 of the first permanent magnet 21 in the axial direction of the rotor core 10 are H3 and H4 respectively, and the lengths of the two first sub-magnets 201 of the second permanent magnet 22 in the axial direction of the rotor core 10 are H5 and H6 respectively, then H1 = H3 + H4 + H5 + H6.

[0052] The length of the second sub-magnet 202 of the first permanent magnet 21 in the axial direction of the rotor core 10 is H7, and the lengths of the two second sub-magnets 202 of the second permanent magnet 22 in the axial direction of the rotor core 10 are H8 and H9 respectively, then H2 = H7 + H8 + H9.

[0053] In other embodiments, as Figure 4 shown, it is also possible to make the first permanent magnet 21 include a plurality of first sub-magnets 201 distributed in sequence along the axial direction of the rotor core 10, and the second permanent magnet 22 include a plurality of second sub-magnets 202 distributed in sequence along the axial direction of the rotor core 10.

[0054] In some embodiments, as Figure 1 shown, the magnetic slot unit 11 may further include a second magnetic slot 112, and a third permanent magnet 23 is provided in the second magnetic slot 112. The remanence of the third permanent magnet 23 is greater than the remanence of the second permanent magnet 22, and the third permanent magnet 23 is closer to the outer peripheral surface 101 of the rotor core 10 than the second permanent magnet 22. Thus, the magnetic flux passing through the air gap of the motor can be further increased, and the magnetic flux utilization rate of the magnetic members in the motor rotor 1 is higher.

[0055] It should be noted that the remanence of the third permanent magnet 23 can be the same as the remanence of the first permanent magnet 21, or the remanence of the third permanent magnet 23 can be greater than or less than the remanence of the first permanent magnet 21, as long as the remanence of the third permanent magnet 23 is greater than the remanence of the second permanent magnet 22.

[0056] Among them, the second magnetic slot 112 of the magnetic slot unit 11 can be located between the two first magnetic slots 111. Thus, the magnetic flux distribution at the outer peripheral surface 101 of the rotor core 10 of the permanent magnets provided in the respective magnetic slots of the magnetic slot unit 11 can be made more uniform.

[0057] Specifically, the second magnetic slot 112 is located between the first ends 1111 of the two first magnetic slots 111 of the magnetic slot unit 11. One end of the second magnetic slot 112 is close to the first end 1111 of one first magnetic slot 111, and the other end of the second magnetic slot 112 is close to the first end 1111 of the other first magnetic slot 111. The second magnetic slot 112 extends linearly between the first ends 1111 of the two first magnetic slots 111. The width direction of the second magnetic slot 112 is consistent with the distribution direction of the first ends 1111 of the two first magnetic slots 111. The shape of the third permanent magnet 23 is adapted to the shape of the second magnetic slot 112. The width direction of the third permanent magnet 23 is consistent with the distribution direction of the first ends 1111 of the two first magnetic slots 111.

[0058] In other embodiments, as Figure 7 shown, a fifth permanent magnet 25 can also be arranged in the second magnetic slot 112. The remanence of the fifth permanent magnet 25 is less than that of the third permanent magnet 23, and the minimum distance from the fifth permanent magnet 25 to the outer peripheral surface 101 of the rotor core 10 is greater than the minimum distance from at least one third permanent magnet 23 to the outer peripheral surface 101 of the rotor core 10. Thus, while the magnetic flux passing through the air gap of the motor can be made substantially constant to maintain the torque of the motor, the magnetic flux utilization rate of the magnetic components in the second magnetic slot 112 is higher, which is beneficial to reducing the cost of the motor rotor 1.

[0059] Specifically, one third permanent magnet 23 and one fifth permanent magnet 25 can be arranged in the second magnetic slot 112, and the minimum distance from the third permanent magnet 23 in the second magnetic slot 112 to the outer peripheral surface 101 of the rotor core 10 is less than the minimum distance from the fifth permanent magnet 25 to the outer peripheral surface 101 of the rotor core 10.

[0060] In other embodiments, as Figure 5 and Figure 6 shown, the number of the third permanent magnets 23 in the second magnetic slot 112 can also be multiple. The minimum distances from the multiple third permanent magnets 23 to the outer peripheral surface 101 of the rotor core 10 are all less than the minimum distance from the fifth permanent magnet 25 to the outer peripheral surface 101 of the rotor core 10. Specifically, the number of the third permanent magnets 23 in the second magnetic slot 112 is two, and the number of the fifth permanent magnets 25 is one. The two third permanent magnets 23 are located on both sides of the fifth permanent magnet 25 along the circumferential direction of the rotor core 10.

[0061] In other embodiments, as Figure 7As shown, the magnetic slot unit 11 may further include a plurality of second magnetic slots 112, and the plurality of second magnetic slots 112 of the magnetic slot unit 11 are sequentially distributed along the circumferential direction of the rotor core 10. Among them, the distance between two adjacent second magnetic slots 112 of the magnetic slot unit 11 may gradually decrease in the direction from the outer peripheral surface 101 of the rotor core 10 to the central axis X, so that the distribution of the two second magnetic slots 112 of the magnetic slot unit 11 is more adapted to the shape of the rotor core 10.

[0062] Specifically, the magnetic slot unit 11 includes two second magnetic slots 112. The second magnetic slots 112 of the magnetic slot unit 11 extend along a straight line. One end of the second magnetic slot 112 is closer to the outer peripheral surface 101 of the rotor core 10 than the other end. The distance between the ends of the two second magnetic slots 112 close to the outer peripheral surface 101 of the rotor core 10 is greater than the distance between the ends of the two second magnetic slots 112 far from the outer peripheral surface 101 of the rotor core 10. The distances from the ends of the two second magnetic slots 112 close to the outer peripheral surface 101 of the rotor core 10 to the central axis X of the rotor core 10 are equal. The distances from the ends of the two second magnetic slots 112 far from the outer peripheral surface 101 of the rotor core 10 to the central axis X of the rotor core 10 are equal.

[0063] The two second magnetic slots 112 of the magnetic slot unit 11 are symmetrically distributed. The central axis X of the motor rotor 1 is located on the symmetry plane of the two second magnetic slots 112 of the magnetic slot unit 11. The two second magnetic slots 112 of the magnetic slot unit 11 are located between the two first magnetic slots 111. The symmetry plane of the two second magnetic slots 112 of the magnetic slot unit 11 coincides with the symmetry plane of the two first magnetic slots 111.

[0064] In some embodiments, as Figure 9 shown, the magnetic slot unit 11 may further include a fourth magnetic slot 114, and a sixth permanent magnet 26 is provided in the fourth magnetic slot 114, and the remanence of the sixth permanent magnet 26 is greater than the remanence of the second permanent magnet 22. Among them, the fourth magnetic slot 114 is located between the ends of the two second magnetic slots 112 far from the outer peripheral surface 101 of the rotor core 10.

[0065] In some embodiments, as Figure 1 shown, the magnetic slot unit 11 may further include a third magnetic slot 113, and a fourth permanent magnet 24 is provided in the third magnetic slot 113. The remanence of the fourth permanent magnet 24 is less than the remanence of the first permanent magnet 21, and the first permanent magnet 21 is closer to the outer peripheral surface 101 of the rotor core 10 than the fourth permanent magnet 24, so as to further improve the magnetic flux passing through the air gap of the motor and the magnetic flux utilization rate of the magnetic components in the motor rotor 1.

[0066] It should be noted that one fourth permanent magnet 24 may be provided in the third magnetic slot 113. Or, as Figure 6As shown, a plurality of fourth permanent magnets 24 can also be provided in the third magnetic slot 113. The plurality of fourth permanent magnets 24 are sequentially distributed along the circumferential direction of the rotor core 10.

[0067] Among them, the third magnetic slot 113 of the magnetic slot unit 11 can be located between two first magnetic slots 111, so that the magnetic flux distribution passing through the air gap of the motor is more uniform. Specifically, the third magnetic slot 113 is located between the second ends 1112 of the two first magnetic slots 111. Among them, the third magnetic slot 113 can extend linearly between the second ends 1112 of the two first magnetic slots 111. Or, as Figure 8 and Figure 9 shown, the third magnetic slot 113 can extend in a curve between the second ends 1112 of the two first magnetic slots 111. Among them, the convex side of the third magnetic slot 113 can face the central axis X of the rotor core 10, and the concave side of the third magnetic slot 113 can face the outer peripheral surface 101 of the rotor core 10.

[0068] It should be noted that, as Figures 5 to 10 shown, the first magnetic slot 111, the second magnetic slot 112, the third magnetic slot 113 and the fourth magnetic slot 114 of the magnetic slot unit 11 can be combined in different quantities and shapes. For example: the magnetic slot unit 11 can include one or more of the first magnetic slot 111, the second magnetic slot 112, the third magnetic slot 113 and the fourth magnetic slot 114. The shapes of the first magnetic slot 111, the second magnetic slot 112, the third magnetic slot 113 and the fourth magnetic slot 114 can be any one of the various shapes described above. The number of permanent magnets provided in the first magnetic slot 111, the second magnetic slot 112, the third magnetic slot 113 and the fourth magnetic slot 114 can be one or more.

[0069] In some embodiments, the sum of the widths of the first permanent magnet 21 and the third permanent magnet 23 is L1, and the sum of the widths of the second permanent magnet 22 and the fourth permanent magnet 24 is L2, where 0.8 ≤ L1 / L2 ≤ 1.5. Thus, while the torque density of the motor can be made larger, the cost of the permanent magnets of the motor can be made lower.

[0070] It should be noted that the ratio of L1 to L2 can be 0.9, 1, 1.1, 1.2, 1.3, etc. The sum of the widths of the first permanent magnet 21 and the third permanent magnet 23 is the sum of the widths of the first permanent magnet 21 and the second permanent magnet 22 provided in the magnetic slot unit 11. For example Figure 1 shown, L1 is the sum of the width L3 of the first permanent magnet 21 in the two first magnetic slots 111 and the width L4 of the third permanent magnet 23 in the second magnetic slot 112, that is, L1 = 2×L3 + L4.

[0071] The sum of the widths of the second permanent magnet 22 and the fourth permanent magnet 24 is the sum of the widths of the second permanent magnet 22 and the fourth permanent magnet 24 provided in the magnetic slot unit 11. For exampleFigure 1 As shown, L2 is the sum of the width L5 of the second permanent magnets 22 in the two first magnetic slots 111 and the width L6 of the fourth permanent magnets 24 in the third magnetic slots 113, that is, L2 = 2×L5 + L6.

[0072] In some embodiments, the first permanent magnet 21 and / or the second permanent magnet 22 may satisfy: 0.2 ≤ 360 / (5×P×D×(L / W)×sinθ) ≤ 6.5; where L is the width of the first permanent magnet 21 or the second permanent magnet 22, W is the thickness of the first permanent magnet 21 or the second permanent magnet 22, θ is the angle between the placement direction of the first permanent magnet 21 or the second permanent magnet 22 and the d-axis (also called the direct axis) of the motor rotor 1, P is the number of poles of the motor rotor 1, and D is the outer diameter of the rotor core 10.

[0073] Thereby, while the first permanent magnet 21 and / or the second permanent magnet 22 of the motor rotor 1 are not easily demagnetized, the problem that the magnetic density of the motor rotor 1 is too high, resulting in large iron losses of the motor, can be avoided, which is beneficial to improving the efficiency of the motor and reducing the cost of the motor.

[0074] It should be noted that the value of 360 / (5×P×D×(L / W)×sinθ) can be 0.3, 0.5, 1, 1.5, 2, 3, 5, etc. The thickness direction, width direction, and length direction of the first permanent magnet 21 or the second permanent magnet 22 are substantially perpendicular to each other.

[0075] In the embodiments of the present application, glue can be filled in each magnetic slot of the magnetic slot unit 11 to fix the permanent magnets in the magnetic slots. In addition, an inclined pole structure can be added in the axial direction of the rotor core 10, and its inclined pole angle can be adjusted according to design requirements, which is not limited here. In addition, one or more oil guide grooves 115 extending along the axial direction of the rotor core 10 can be provided in the rotor core 10 to improve the cooling efficiency of the rotor core 10.

[0076] In some embodiments, the rotor core 10 can be formed by stacking and stamping a plurality of silicon steel sheets. The magnetic slots and the oil guide grooves 115 penetrate through a plurality of silicon steel sheets along the axial direction of the rotor core 10. End plates are also provided at both ends of the rotor core 10. The end plates and the rotor core 10 can be fixedly connected by rivets or screws.

[0077] The embodiments of the present application also provide a motor, which includes a motor rotor. The specific structure of the motor rotor refers to the above embodiments. Since this motor adopts all the technical solutions of the above all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0078] Among them, the motor includes a motor rotor 1 and a motor stator, and the motor rotor 1 and the motor stator are rotatably connected. The structure of the motor rotor 1 can refer to the above embodiments and will not be elaborated here.

[0079] An embodiment of the present application also provides a vehicle, which includes a motor. The specific structure of the motor refers to the above embodiments. Since this vehicle adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0080] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0081] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not elaborated in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0082] Among the embodiments, embodiments, and related technical features of the present application, they can be combined and replaced with each other without conflict.

[0083] The above are only the preferred embodiments of the present application and do not impose any form of limitation on the present application. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A motor rotor, characterized in that, Comprising: A rotor core including a first magnetic slot extending along its axial direction; A magnetic assembly disposed in the first magnetic slot, the magnetic assembly including a first permanent magnet and a second permanent magnet, the remanence of the first permanent magnet being greater than that of the second permanent magnet, and at least one of the first permanent magnets being closer to the outer peripheral surface of the rotor core than the second permanent magnet.

2. The motor rotor according to claim 1, characterized in that, The second permanent magnet is closer to the central axis of the rotor core than at least one of the first permanent magnets.

3. The motor rotor according to claim 1, characterized in that, The rotor core includes a plurality of magnetic slot units sequentially distributed along its circumferential direction, each magnetic slot unit including at least two of the first magnetic slots, and the magnetic assemblies are respectively disposed in at least two of the first magnetic slots of the magnetic slot unit.

4. The motor rotor according to claim 3, wherein At least two of the first magnetic slots of the magnetic slot unit are sequentially distributed along the circumferential direction of the rotor core.

5. The motor rotor according to claim 4, wherein, In the direction from the outer peripheral surface to the central axis of the rotor core, the distance between two adjacent first magnetic slots of the magnetic slot unit gradually decreases.

6. The motor rotor according to claim 3, characterized in that, The magnetic slot unit further includes a second magnetic slot, and a third permanent magnet is disposed in the second magnetic slot, the remanence of the third permanent magnet being greater than that of the second permanent magnet, and the third permanent magnet being closer to the outer peripheral surface of the rotor core than the second permanent magnet.

7. The motor rotor according to claim 6, characterized in that, The second magnetic slot of the magnetic slot unit is located between two of the first magnetic slots.

8. The motor rotor according to claim 6, characterized in that, The magnetic slot unit further includes a third magnetic slot, and a fourth permanent magnet is disposed in the third magnetic slot, the remanence of the fourth permanent magnet being less than that of the first permanent magnet, and the first permanent magnet being closer to the outer peripheral surface of the rotor core than the fourth permanent magnet.

9. The motor rotor according to claim 8, characterized in that, The third magnetic slot of the magnetic slot unit is located between two of the first magnetic slots.

10. The motor rotor according to claim 8, characterized in that, The sum of the widths of the first permanent magnet and the third permanent magnet is L1, and the sum of the widths of the second permanent magnet and the fourth permanent magnet is L2, where 0.8 ≤ L1 / L2 ≤ 1.

5.

11. The motor rotor according to claim 1, characterized in that, The magnetic assembly includes two of the first permanent magnets, and the second permanent magnet is located between the two first permanent magnets.

12. The motor rotor according to any one of claims 1 to 11, characterized in that, The first permanent magnet and / or the second permanent magnet satisfy: 0.2 ≤ 360 / (5×P×D×(L / W)×sinθ) ≤ 6.5; Wherein, L is the width of the first permanent magnet or the second permanent magnet, W is the thickness of the first permanent magnet or the second permanent magnet, θ is the included angle between the placement direction of the first permanent magnet or the second permanent magnet and the d-axis of the motor rotor, P is the number of poles of the motor rotor, and D is the outer diameter of the rotor core.

13. The motor rotor according to any one of claims 1 to 11, characterized in that, The first permanent magnet includes at least one first sub-magnet and at least one second sub-magnet disposed along the axial direction of the rotor core, and the remanence of the first sub-magnet is different from that of the second sub-magnet; and / or, The second permanent magnet includes at least one first sub-magnet and at least one second sub-magnet disposed along the axial direction of the rotor core, and the remanence of the first sub-magnet is different from that of the second sub-magnet.

14. The motor rotor according to claim 13, characterized in that, The remanence of the first sub-magnet is greater than that of the second sub-magnet; the magnetic assembly satisfies: 0.5 ≤ H1 / H2 ≤ 1.2, where H1 is the sum of the lengths of the plurality of the first sub-magnets of the magnetic assembly in the axial direction of the rotor core; and H2 is the sum of the lengths of the plurality of the second sub-magnets of the magnetic assembly in the axial direction of the rotor core.

15. A motor, characterized in that, It includes the motor rotor according to any one of claims 1 to 14.

16. A vehicle, characterized in that, It includes the motor according to claim 15.

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