Motor rotor, motor and vehicle

Abstract

The application relates to a motor rotor, a motor and a vehicle. The motor rotor comprises a rotor core and a magnetic assembly. The rotor core comprises a first magnetic slot extending along an axial direction thereof. The magnetic assembly is arranged in the first magnetic slot. The magnetic assembly comprises first permanent magnets and second permanent magnets. The residual magnetism of the first permanent magnets is greater than that of the second permanent magnets. At least one first permanent magnet is closer to an outer circumferential surface of the rotor core than the second permanent magnets. According to the application, the first permanent magnets and the second permanent magnets with different residual magnetism are arranged in the magnetic slot of the rotor core. The first permanent magnets with greater residual magnetism and higher cost are arranged closer to the outer circumferential surface of the rotor core, and the second permanent magnets with lower residual magnetism and lower cost are arranged farther away from the outer circumferential surface of the rotor core than the first permanent magnets. Therefore, more magnetic flux of the magnetic assembly can pass through the air gap of the motor, the magnetic flux passing through the air gap of the motor is basically unchanged to maintain the torque of the motor, and the overall cost of the magnetic assembly is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, and in particular to an electric machine rotor, an electric machine and a vehicle. BACKGROUND

[0002] In the related art, the rotor of an electric machine for a vehicle usually adopts an inner-insert 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 electric machine can generate a larger torque.

[0003] However, in order to ensure that the rotor of the electric machine can reach a predetermined torque, more high-remanence permanent magnets are often arranged in the rotor of the electric machine, so that the magnetic flux passing through the air gap of the electric machine meets the requirements. This increases the cost of the permanent magnets, and in turn increases the cost of the electric machine. SUMMARY

[0004] The electric machine rotor, the electric machine and the vehicle provided by the embodiments of the present application reduce the cost of the permanent magnets of the electric machine rotor while maintaining the torque of the electric machine rotor substantially unchanged, thereby at least partially solving the above technical problems.

[0005] To achieve the above-mentioned purpose, according to a first aspect of the present application, an electric machine rotor is provided, comprising:

[0006] A rotor core comprising a first magnetic slot extending along an axial direction thereof;

[0007] A magnetic assembly arranged in the first magnetic slot, the magnetic assembly comprising a first permanent magnet and a second permanent magnet, the remanence of the first permanent magnet being greater than the remanence of the second permanent magnet, and at least one first permanent magnet being closer to an outer circumferential surface of the rotor core than the second permanent magnet.

[0008] Optionally, the second permanent magnet is closer to a central axis of the rotor core than the at least one first permanent magnet.

[0009] Optionally, the rotor core comprises a plurality of magnetic slot units arranged in sequence along a circumferential direction thereof, each magnetic slot unit comprising at least two first magnetic slots, and the magnetic assembly being arranged in the at least two first magnetic slots of the magnetic slot unit, respectively.

[0010] Optionally, the at least two first magnetic slots of the magnetic slot unit are arranged in sequence along the circumferential direction of the rotor core.

[0011] Optionally, in a direction from the outer circumferential surface of the rotor core to the central axis, the spacing between adjacent two first magnetic slots of the magnetic slot unit gradually decreases.

[0012] Optionally, the magnetic slot unit further comprises a second magnetic slot, and a third permanent magnet is arranged in the second magnetic slot, wherein the residual magnetism of the third permanent magnet is greater than that of the second permanent magnet, and the third permanent magnet is closer to the outer circumferential surface of the rotor core than the second permanent magnet.

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

[0014] Optionally, the magnetic slot unit further comprises a third magnetic slot, and a fourth permanent magnet is arranged in the third magnetic slot, wherein the residual magnetism of the fourth permanent magnet is less than that of the first permanent magnet, and the first permanent magnet is closer to the outer circumferential surface of the rotor core than the fourth permanent magnet.

[0015] Optionally, the third magnetic slot of the magnetic slot unit is located between two first magnetic slots.

[0016] 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, wherein 0.8≤L1 / L2≤1.5.

[0017] Optionally, the magnetic assembly comprises two first permanent magnets, and the second permanent magnet is located between the two first permanent magnets.

[0018] Optionally, the first permanent magnet and / or the second permanent magnet satisfy 0.2≤360 / (5×P×D×(L / W)×sinθ)≤6.5.

[0019] 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.

[0020] Optionally, the first permanent magnet comprises at least one first-type sub-magnet and at least one second-type sub-magnet arranged along the axial direction of the rotor core, and the residual magnetism of the first-type sub-magnet is different from that of the second-type sub-magnet; and / or,

[0021] the second permanent magnet comprises at least one first-type sub-magnet and at least one second-type sub-magnet arranged along the axial direction of the rotor core, and the residual magnetism of the first-type sub-magnet is different from that of the second-type sub-magnet.

[0022] Optionally, the magnetic assembly satisfies: 0.5≤H1 / H2≤1.2, wherein H1 is the sum of the lengths of the plurality of first-type 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 second-type sub-magnets of the magnetic assembly in the axial direction of the rotor core.

[0023] According to a second aspect of the present application, there is provided an electric machine comprising an electric machine rotor as described above, the electric machine rotor comprising:

[0024] a rotor core comprising a first magnetic slot extending in an axial direction thereof;

[0025] a magnetic assembly disposed in the first magnetic slot, the magnetic assembly comprising first permanent magnets and second permanent magnets, the first permanent magnets having a greater residual magnetism than the second permanent magnets, at least one of the first permanent magnets being closer to an outer circumferential surface of the rotor core than the second permanent magnets.

[0026] According to a third aspect of the present application, there is also provided a vehicle comprising an electric machine as described above.

[0027] The electric machine rotor provided by the embodiments of the present application has the first permanent magnets and the second permanent magnets with different residual magnetism disposed in the magnetic slot of the rotor core, and the first permanent magnets with greater residual magnetism and higher cost are closer to the outer circumferential surface of the rotor core, while the second permanent magnets with lower residual magnetism and lower cost are farther away from the outer circumferential surface of the rotor core than the first permanent magnets, so that more magnetic flux of the magnetic assembly can pass through the air gap of the electric machine smoothly, the magnetic flux passing through the air gap of the electric machine is substantially unchanged to maintain the torque of the electric machine, and the overall cost of the magnetic assembly is reduced.

[0028] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0030] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0031] Figure 1 An axial view of one embodiment of the electric machine rotor provided by the embodiments of the present application;

[0032] Figure 2An axial sectional view of a first embodiment of a motor rotor provided by the embodiment of the present application;

[0033] Figure 3 An axial sectional view of a second embodiment of a motor rotor provided by the embodiment of the present application;

[0034] Figure 4 An axial sectional view of a third embodiment of a motor rotor provided by the embodiment of the present application;

[0035] Figure 5 An axial view of a first embodiment of a magnetic slot unit provided by the embodiment of the present application;

[0036] Figure 6 An axial view of a second embodiment of a magnetic slot unit provided by the embodiment of the present application;

[0037] Figure 7 An axial view of a third embodiment of a magnetic slot unit provided by the embodiment of the present application;

[0038] Figure 8 An axial view of a fourth embodiment of a magnetic slot unit provided by the embodiment of the present application;

[0039] Figure 9 An axial view of a fifth embodiment of a magnetic slot unit provided by the embodiment of the present application;

[0040] Figure 10 An axial view of a sixth embodiment of a magnetic slot unit provided by the embodiment of the present application.

[0041] Explanation of reference signs:

[0042] Motor rotor 1; rotor core 10; outer circumferential 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 guide slot 115; magnetic assembly 20; first permanent magnet 21; second permanent magnet 22; first type of sub-magnet 201; second type of sub-magnet 202; third permanent magnet 23; fourth permanent magnet 24; fifth permanent magnet 25; sixth permanent magnet 26; central axis X. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person skilled in the art without creative effort fall within the protection scope of the present application.

[0044] The embodiment of the present application provides a motor rotor, a motor and a vehicle. The following are described in detail respectively.

[0045] Figure 1 An axial view of one embodiment of the motor rotor provided by the embodiment of the present application is shown in the figure. Figure 1 As shown in the figure, the motor rotor 1 comprises a rotor core 10 and a magnetic assembly 20, the rotor core 10 comprises a first magnetic slot 111 extending along the axial direction thereof. The magnetic assembly 20 is arranged in the first magnetic slot 111.

[0046] In the embodiment, the magnetic assembly 20 can comprise a first permanent magnet 21 and a second permanent magnet 22, the residual magnetism of the first permanent magnet 21 is greater than that of the second permanent magnet 22, and at least one first permanent magnet 21 is closer to the outer circumferential surface 101 of the rotor core 10 than the second permanent magnet 22, so that the minimum distance from the at least one first permanent magnet 21 to the outer circumferential surface 101 of the rotor core 10 is less than the minimum distance from the second permanent magnet 22 to the outer circumferential surface 101 of the rotor core 10.

[0047] The motor rotor 1 provided by the embodiment of the present application sets the residual magnetism different first permanent magnet 21 and the second permanent magnet 22 in the first magnetic slot 111 of the rotor core 10, and makes the first permanent magnet 21 with greater residual magnetism and higher cost closer to the outer circumferential surface 101 of the rotor core 10, and the second permanent magnet 22 with lower residual magnetism and lower cost farther away from the outer circumferential surface 101 of the rotor core 10 than the first permanent magnet 21, so that more magnetic flux of the magnetic assembly 20 can smoothly pass through the air gap of the motor, the magnetic flux passing through the air gap of the motor is basically unchanged to maintain the torque of the motor, and the magnetic flux utilization rate of the magnetic assembly 20 is higher, which is conducive to reducing the overall cost of the magnetic assembly 20.

[0048] It should be noted that when the magnetic assembly 20 comprises a plurality of first permanent magnets 21, one first permanent magnet 21 can be closer to the outer circumferential 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 circumferential surface 101 of the rotor core 10 than the second permanent magnet 22.

[0049] For example Figure 5 As shown in the figure, the magnetic assembly 20 comprises 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. Alternatively, as shown in the figure Figure 7 , the magnetic assembly 20 comprises two first permanent magnets 21 and one second permanent magnet 22, and the two first permanent magnets 21 are located on the side of the second permanent magnet 22 close to the outer circumferential surface 101 of the rotor core 10, so that the two first permanent magnets 21 are closer to the outer circumferential surface 101 of the rotor core 10 than the second permanent magnet 22.

[0050] In some embodiments, as shown in the figures Figure 1 andFigure 2 As shown, the second permanent magnet 22 can be arranged closer to the central axis X of the rotor core 10 than the at least one first permanent magnet 21. In this way, the first permanent magnet 21 with greater residual magnetism can be arranged closer to the outer circumferential surface 101 of the rotor core 10, which is conducive to further improving the magnetic flux utilization rate of the magnetic assembly 20.

[0051] Specifically, the first magnetic slot 111 includes a first end 1111 close to the outer circumferential surface 101 of the rotor core 10, and a second end 1112 close to the central axis X of the rotor core 10, and the first permanent magnet 21 and the second permanent magnet 22 in the first magnetic slot 111 are arranged in sequence 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 is also perpendicular to the axial direction of the rotor core 10.

[0052] In some embodiments, as shown, Figure 1 As shown, the rotor core 10 includes a plurality of magnetic slot units 11 arranged in sequence along the circumferential direction thereof, and each magnetic slot unit 11 includes at least one first magnetic slot 111 in which the magnetic assembly 20 is arranged. In this way, the magnetic flux utilization rate of the magnetic assembly 20 in the rotor core 10 can be further improved, thereby further reducing the cost of the motor rotor 1.

[0053] In some embodiments, as shown,

[0054] In some embodiments, the at least two first magnetic slots 111 of the magnetic slot unit 11 can be arranged in sequence 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 conducive to improving the working stability of the motor.

[0055] In some embodiments, as shown,

[0056] It can be understood that since the diameter of the rotor core 10 becomes smaller as it approaches the center axis X, by gradually reducing the distance between two adjacent first magnetic slots 111 in the direction from the outer circumferential surface 101 of the rotor core 10 to the center axis X, the first magnetic slots 111 can have a larger width while the first magnetic slots 111 of two adjacent magnetic slot units 11 will not interfere with each other.

[0057] Specifically, the magnetic slot unit 11 includes two first magnetic slots 111. The first magnetic slots 111 of the magnetic slot unit 11 extend along a straight line from a first end 1111 to a second end 1112. The spacing between the first ends 1111 of the two first magnetic slots 111 of the magnetic slot unit 11 is greater than the spacing 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.

[0058] In other embodiments, Figure 8 As shown, the first magnetic slot 111 of the magnetic slot unit 11 may include a first slot segment 1113 extending from the first end 1111 to the second end 1112, and a second slot segment 1114 extending from the first slot segment 1113 to the second end 1112. The first slot segment 1113 extends along a straight line, and the second slot segment 1114 extends along a curve. The distance between the second slot segments 1114 of the two first magnetic slots 111 of the magnetic slot unit 11 gradually decreases in the direction from the outer circumferential surface 101 of the rotor core 10 to the central axis X.

[0059] 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 may be disposed in the second slot section 1114 and adapted to the shape of the second slot section 1114.

[0060] Or, as Figure 7 As shown, the magnetic assembly 20 can include multiple first permanent magnets 21, and the multiple first permanent magnets 21 of the magnetic assembly 20 are arranged in the first slot section 1113 of the first magnetic slot 111, and are distributed in sequence from the first end 1111 to the second end 1112 of the first magnetic slot 111.

[0061] In some embodiments, as Figure 3As shown, the first permanent magnet 21 can include at least one first type of sub-magnet 201 and at least one second type of sub-magnet 202 arranged along the axial direction of the rotor core 10, the remanence of the first type of sub-magnet 201 being different from that of the second type of sub-magnet 202. Thus, by adjusting the number or size of the first type of sub-magnet 201 and the second type of sub-magnet 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 conducive to reducing the cost of the first permanent magnet 21. The remanence of the first type of sub-magnet 201 can be greater than or less than that of the second type of sub-magnet 202.

[0062] Likewise, the second permanent magnet 22 can include at least one first type of sub-magnet 201 and at least one second type of sub-magnet 202 arranged along the axial direction of the rotor core 10, the remanence of the first type of sub-magnet 201 being different from that of the second type of sub-magnet 202. Thus, by adjusting the number or size of the first type of sub-magnet 201 and the second type of 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 conducive to reducing the cost of the second permanent magnet 22.

[0063] It should be noted that the first permanent magnet 21 and the second permanent magnet 22 can both include at least one first type of sub-magnet 201 and at least one second type of sub-magnet 202, or one of the first permanent magnet 21 and the second permanent magnet 22 can include at least one first type of sub-magnet 201 and at least one second type of sub-magnet 202. Of course, the latter can make the remanence adjustment of the first permanent magnet 21 and the second permanent magnet 22 more flexible.

[0064] 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 circumferential 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 be located on the side of the second permanent magnet 22 close to the outer circumferential 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.

[0065] In some embodiments, the residual magnetism of the first type of sub-magnet 201 can be made greater than the residual magnetism of the second type of 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 plurality of first type of sub-magnets 201 of the magnetic assembly 20 in the axial direction of the rotor core 10, and H2 is the sum of the lengths of the plurality of second type of sub-magnets 202 of the magnetic assembly 20 in the axial direction of the rotor core 10, so that the motor rotor 1 has more magnetic flux passing through the air gap of the motor while reducing the cost of the magnetic assembly 20 as much as possible.

[0066] It should be noted that when the first permanent magnet 21 and the second permanent magnet 22 each include at least one first type of sub-magnet 201 and at least one second type of sub-magnet 202, H1 is the sum of the lengths of the plurality of first type of 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 plurality of second type of 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.

[0067] Specifically, for example, the first permanent magnet 21 includes two first type of sub-magnets 201 and one second type of sub-magnet 202, and the second type of sub-magnet 202 of the first permanent magnet 21 is located between the two first type of sub-magnets 201. The second permanent magnet 22 includes two first type of sub-magnets 201 and two second type of sub-magnets 202, and the two first type of sub-magnets 201 and the two second type of sub-magnets 202 of the second permanent magnet 22 are alternately distributed in the axial direction of the rotor core 10.

[0068] Wherein, the lengths of the two first type of 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 type of 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.

[0069] The length of the second type of 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 type of 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.

[0070] In other embodiments, as shown in Figure 4 the first permanent magnet 21 can also include a plurality of first type of sub-magnets 201 distributed in the axial direction of the rotor core 10 in turn, and the second permanent magnet 22 can include a plurality of second type of sub-magnets 202 distributed in the axial direction of the rotor core 10 in turn.

[0071] In some embodiments, as shown in Figure 1As shown, the magnetic slot unit 11 may further include a second magnetic slot 112, in which a third permanent magnet 23 is disposed. The remanence of the third permanent magnet 23 is greater than that of the second permanent magnet 22, and the third permanent magnet 23 is closer to the outer circumferential 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, thereby improving the magnetic flux utilization rate of the magnetic components in the motor rotor 1.

[0072] 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.

[0073] The second magnetic slot 112 of the magnetic slot unit 11 can be located between the two first magnetic slots 111. This allows the magnetic flux distribution of the permanent magnets disposed in each magnetic slot of the magnetic slot unit 11 on the outer circumferential surface 101 of the rotor core 10 to be more uniform.

[0074] Specifically, the second magnetic groove 112 is located between the first ends 1111 of the two first magnetic grooves 111 of the magnetic groove unit 11. One end of the second magnetic groove 112 is close to the first end 1111 of one first magnetic groove 111, and the other end of the second magnetic groove 112 is close to the first end 1111 of the other first magnetic groove 111. The second magnetic groove 112 extends in a straight line between the first ends 1111 of the two first magnetic grooves 111. The width direction of the second magnetic groove 112 is consistent with the distribution direction of the first ends 1111 of the two first magnetic grooves 111. The shape of the third permanent magnet 23 is adapted to the shape of the second magnetic groove 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 grooves 111.

[0075] In other embodiments, Figure 7 As shown, a fifth permanent magnet 25 may be further disposed 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 between the fifth permanent magnet 25 and the outer circumferential surface 101 of the rotor core 10 is greater than the minimum distance between at least one third permanent magnet 23 and the outer circumferential surface 101 of the rotor core 10. Thus, while the magnetic flux passing through the air gap of the motor can be kept 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 increased, thereby reducing the cost of the motor rotor 1.

[0076] Specifically, a third permanent magnet 23 and a 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 smaller than the minimum distance from the fifth permanent magnet 25 to the outer peripheral surface 101 of the rotor core 10.

[0077] In other embodiments, Figure 5 and Figure 6 As shown, the number of third permanent magnets 23 in the second magnetic slot 112 can also be multiple. The minimum distance between the multiple third permanent magnets 23 and the outer circumferential surface 101 of the rotor core 10 is less than the minimum distance between the fifth permanent magnet 25 and the outer circumferential surface 101 of the rotor core 10. Specifically, the number of third permanent magnets 23 in the second magnetic slot 112 is two, and the number of 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.

[0078] In other embodiments, Figure 7 As 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 may be sequentially distributed along the circumference of the rotor core 10. The distance between two adjacent second magnetic slots 112 of the magnetic slot unit 11 may be gradually reduced in the direction from the outer circumferential 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 compatible with the shape of the rotor core 10.

[0079] Specifically, the magnetic slot unit 11 includes two second magnetic slots 112. The second magnetic slots 112 of the magnetic slot unit 11 extend in a straight line. One end of the second magnetic slot 112 is closer to the outer circumferential 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 circumferential surface 101 of the rotor core 10 is greater than the distance between the ends of the two second magnetic slots 112 away from the outer circumferential surface 101 of the rotor core 10. The distances from the ends of the two second magnetic slots 112 close to the outer circumferential 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 away from the outer circumferential surface 101 of the rotor core 10 to the central axis X of the rotor core 10 are equal.

[0080] 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.

[0081] In some embodiments, as Figure 9 As shown, the magnetic slot unit 11 may further include a fourth magnetic slot 114, in which a sixth permanent magnet 26 is disposed. The remanence of the sixth permanent magnet 26 is greater than the remanence of the second permanent magnet 22. The fourth magnetic slot 114 is located between the ends of the two second magnetic slots 112 away from the outer circumferential surface 101 of the rotor core 10.

[0082] In some embodiments, as Figure 1As shown, the magnetic slot unit 11 can further include a third magnetic slot 113, and a fourth permanent magnet 24 is arranged in the third magnetic slot 113. The residual magnetism of the fourth permanent magnet 24 is less than that of the first permanent magnet 21, and the first permanent magnet 21 is closer to the outer circumferential surface 101 of the rotor core 10 than the fourth permanent magnet 24, thereby further improving the magnetic flux of the motor passing through the air gap and the utilization rate of the magnetic flux of the magnetic member in the motor rotor 1.

[0083] It should be noted that one fourth permanent magnet 24 can be arranged in the third magnetic slot 113. Alternatively, as shown in Figure 6 , a plurality of fourth permanent magnets 24 can also be arranged in the third magnetic slot 113. The plurality of fourth permanent magnets 24 are sequentially distributed along the circumference of the rotor core 10.

[0084] Among them, the third magnetic slot 113 of the magnetic slot unit 11 can be located between the two first magnetic slots 111, so that the magnetic flux distribution of the motor passing through the air gap 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 in a straight line between the second ends 1112 of the two first magnetic slots 111. Alternatively, as shown in Figure 8 and Figure 9 , 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 circumferential surface 101 of the rotor core 10.

[0085] It should be noted that, as shown in Figure 5 to Figure 10 , 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 numbers 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 shape 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 of the various shapes described above. The number of permanent magnets arranged 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.

[0086] 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, wherein 0.8≤L1 / L2≤1.5. In this way, the torque density of the motor can be relatively large while the cost of the permanent magnet of the motor is relatively low.

[0087] 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 As 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.

[0088] 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. Figure 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 magnet 24 in the third magnetic slot 113 , that is, L2=2×L5+L6.

[0089] In some embodiments, the first permanent magnet 21 and / or the second permanent magnet 22 can satisfy the following condition: 0.2≤360 / (5×P×D×(L / W)×sinθ)≤6.5; wherein 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.

[0090] In this way, the first permanent magnet 21 and / or the second permanent magnet 22 of the motor rotor 1 can be less likely to be demagnetized, while avoiding the problem of excessive magnetic density of the motor rotor 1, which would lead to large iron loss in the motor, thereby improving the efficiency of the motor and reducing the cost of the motor.

[0091] 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.

[0092] In the embodiment of the present application, glue can be filled into each magnetic slot of the magnetic slot unit 11 to secure the permanent magnets therein. Furthermore, a skewed pole structure can be added axially to the rotor core 10. The skewed pole angle can be adjusted according to design requirements and is not limited here. Furthermore, one or more oil guide grooves 115 can be provided in the rotor core 10 extending axially therefrom to improve the cooling efficiency of the rotor core 10.

[0093] In some embodiments, the rotor core 10 can be formed by stamping a plurality of silicon steel sheets. The magnetic grooves and the oil guide grooves 115 are formed through the plurality of silicon steel sheets in the axial direction of the rotor core 10. End plates are further provided at both ends of the rotor core 10. The end plates can be fixedly connected to the rotor core 10 by rivets or screws.

[0094] The embodiment of the present application further provides a motor, which comprises a motor rotor. The motor rotor has the structure as described in the above embodiments. Since the motor adopts all the technical solutions of the above embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0095] The motor comprises a motor rotor 1 and a motor stator, and the motor rotor 1 and the motor stator are rotationally connected. The structure of the motor rotor 1 can refer to the above embodiments, which will not be repeated here.

[0096] The embodiment of the present application further provides a vehicle, which comprises a motor. The motor has the structure as described in the above embodiments. Since the vehicle adopts all the technical solutions of the above embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0097] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0098] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can refer to the related description of other embodiments.

[0099] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0100] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application, without departing from the technical solution of the present application, still falls within the scope of the technical solution of the present application.

Claims

1. A motor rotor, characterized in that: include: The rotor core includes a first magnetic slot extending along the axial direction thereof; a magnetic assembly disposed in the first magnetic slot, the magnetic assembly comprising a first permanent magnet and a second permanent magnet, the remanence of the first permanent magnet being greater than the remanence of the second permanent magnet, and at least one of the first permanent magnets being closer to the outer circumference of the rotor core than the second permanent magnet; Wherein, the first permanent magnet and / or the second permanent magnet satisfies: 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 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.

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, wherein: The rotor core includes a plurality of magnetic slot units distributed in sequence along its circumference, each of the magnetic slot units includes at least two first magnetic slots, and the magnetic components are respectively provided in at least two of the first magnetic slots of the magnetic slot unit.

4. The motor rotor according to claim 3, characterized in that: The at least two first magnetic slots of the magnetic slot unit are distributed sequentially along the circumference of the rotor core.

5. The motor rotor according to claim 4, characterized in that: In a direction from the outer circumference of the rotor core to the central axis, a 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 also includes a second magnetic slot, in which a third permanent magnet is provided. The remanence of the third permanent magnet is greater than the remanence of the second permanent magnet, and the third permanent magnet is closer to the outer circumference 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 the two first magnetic slots.

8. The motor rotor according to claim 6, characterized in that: The magnetic slot unit further includes a third magnetic slot, in which a fourth permanent magnet is disposed. The remanence of the fourth permanent magnet is smaller than that of the first permanent magnet, and the first permanent magnet is closer to the outer circumference 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 the two 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, wherein 0.8≤L1 / L2≤1.

5.

11. The motor rotor according to claim 1, wherein: The magnetic assembly includes two 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 includes at least one first type sub-magnet and at least one second type sub-magnet arranged along the axial direction of the rotor core, and the remanence of the first type sub-magnet is different from the remanence of the second type sub-magnet; and / or, The second permanent magnet includes at least one first type sub-magnet and at least one second type sub-magnet arranged along the axial direction of the rotor core. The remanence of the first type sub-magnet is different from the remanence of the second type sub-magnet.

13. The motor rotor according to claim 12, characterized in that: The remanence of the first type of sub-magnet is greater than the remanence of the second type of sub-magnet; the magnetic assembly satisfies: 0.5≤H1 / H2≤1.2, wherein H1 is the sum of the lengths of the multiple first type sub-magnets of the magnetic assembly in the axial direction of the rotor core; H2 is the sum of the lengths of the multiple second type sub-magnets of the magnetic assembly in the axial direction of the rotor core.

14. A motor, characterized in that: The motor rotor comprises the motor rotor according to any one of claims 1 to 13.

15. A vehicle, characterized in that: Including the motor according to claim 14.

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