Rotors, motors and vehicles

Abstract

The present invention discloses a rotor, a motor and a vehicle, wherein the rotor comprises: a rotor core; a plurality of first permanent magnet groups, which are arranged at intervals on the rotor core along the circumferential direction of the rotor core, and each first permanent magnet group is arranged perpendicular to the d-axis of the rotor; a plurality of second permanent magnet groups and a plurality of third permanent magnet groups, which are arranged at intervals on the rotor core along the circumferential direction of the rotor core, the first permanent magnet group is located radially outside the second permanent magnet group and the third permanent magnet group, and the second permanent magnet group and the third permanent magnet group are arranged on both sides of the circumference of each first permanent magnet group, respectively, the remanence of each first permanent magnet group is greater than the remanence of the corresponding second permanent magnet group and the third permanent magnet group, and the material of each first permanent magnet group is different from the material of the corresponding second permanent magnet group and the third permanent magnet group. Thus, the cogging torque generated by the rotor core during rotation can be reduced, the torque fluctuation can be reduced, and the NVH performance can be improved.

Description

Technical Field

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

[0002] Permanent magnet synchronous motors are widely used in electric vehicles. The motor is one of the cores of the electric drive system, and the comprehensive performance of the motor directly affects the performance of electric vehicles. At present, there are still technical bottlenecks in the development of high overload capacity and anti-demagnetization permanent magnet synchronous motors (PMSM) for electric vehicles. There are a series of problems such as large cogging torque, high cost, and poor load torque, and there is room for improvement. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a rotor that can reduce the cogging torque generated by the rotor during rotation, thereby reducing the torque fluctuation caused by the cogging torque, reducing the jitter problem caused by the unstable output caused by the torque fluctuation, and is conducive to improving the NVH performance.

[0004] A rotor according to an embodiment of the present invention comprises: a rotor core; a plurality of first permanent magnet groups, the plurality of first permanent magnet groups being arranged at intervals along the circumferential direction of the rotor core on the rotor core, each of the first permanent magnet groups being arranged perpendicular to the d-axis of the rotor; a plurality of second permanent magnet groups, the plurality of second permanent magnet groups being arranged at intervals along the circumferential direction of the rotor core on the rotor core, the first permanent magnet groups being located radially outward of the second permanent magnet groups; a plurality of third permanent magnet groups, the plurality of third permanent magnet groups being arranged at intervals along the circumferential direction of the rotor core on the rotor core, the first permanent magnet groups being located radially outward of the third permanent magnet groups, the second permanent magnet groups and the third permanent magnet groups being arranged on both sides of the circumference of each of the first permanent magnet groups, the remanence of each of the first permanent magnet groups being greater than the remanence of the corresponding second permanent magnet groups, the remanence of each of the first permanent magnet groups being greater than the remanence of the corresponding third permanent magnet groups, and the material of each of the first permanent magnet groups being different from the materials of the corresponding second permanent magnet groups and the third permanent magnet groups.

[0005] According to the rotor of the embodiment of the present invention, the cogging torque generated by the rotor core during rotation can be reduced by installing a first permanent magnet group, a second permanent magnet group and a third permanent magnet group spaced apart on the rotor core, thereby reducing the torque fluctuation caused by the cogging torque, reducing the jitter problem caused by the unstable output caused by the torque fluctuation, and helping to improve the NVH performance. By setting the residual magnetism of the first permanent magnet group to be higher than the residual magnetism of the second permanent magnet group and the third permanent magnet group, for example, setting the second permanent magnet group and the third permanent magnet group to be ferrite magnets, such a setting reduces the amount of rare earth magnets in the rotor, reduces the cost of the rotor, and allows the ferrite magnets to protect the rare earth magnets to reduce the risk of demagnetization of the rare earth magnets.

[0006] According to the rotor of some embodiments of the present invention, each of the first permanent magnet groups, each of the second permanent magnet groups, and each of the third permanent magnet groups include permanent magnets arranged in segments.

[0007] According to the rotor of some embodiments of the present invention, each of the first permanent magnet groups includes a first portion and a second portion, the first portion is located radially outside the second portion, and a circumferential length of the first portion is smaller than a circumferential length of the second portion.

[0008] According to the rotor of some embodiments of the present invention, the first part includes a first permanent magnet and a second permanent magnet arranged in sections; and / or the second part includes a third permanent magnet and a fourth permanent magnet arranged in sections.

[0009] According to the rotor of some embodiments of the present invention, the length of the first permanent magnet is different from the length of the second permanent magnet, and the length of the third permanent magnet is different from the length of the fourth permanent magnet.

[0010] According to the rotor of some embodiments of the present invention, the d-axis passes through the second permanent magnet and the fourth permanent magnet.

[0011] According to the rotor of some embodiments of the present invention, the second permanent magnet group and the third permanent magnet group corresponding to each first permanent magnet group are symmetrically arranged about the d axis, and the second permanent magnet group includes a fifth permanent magnet and a sixth permanent magnet, and the fifth permanent magnet is located on one circumferential side of the sixth permanent magnet.

[0012] According to the rotor of some embodiments of the present invention, the second permanent magnet group further includes a seventh permanent magnet, and the seventh permanent magnet, the fifth permanent magnet and the sixth permanent magnet are sequentially arranged in the circumferential direction of the rotor and in the direction toward the d-axis.

[0013] According to the rotor of some embodiments of the present invention, the seventh permanent magnet and the fifth permanent magnet are made of different materials, and the radial length of the seventh permanent magnet is smaller than the radial length of the fifth permanent magnet.

[0014] According to some embodiments of the present invention, in a rotor, on the same cross section of the rotor, a line between the geometric center of the second permanent magnet and the center of the rotor core is a second line, a line between the geometric center of the sixth permanent magnet and the center of the rotor core is a sixth line, a line between the geometric center of the seventh permanent magnet and the center of the rotor core is a seventh line, an angle between the second line and the d-axis is α2, an angle between the sixth line and the d-axis is α6, an angle between the seventh line and the d-axis is α7, a radial width of the first permanent magnet is W1, and a circumferential width of the seventh permanent magnet is W7, wherein the rotor satisfies the following relationship:

[0015] According to some embodiments of the present invention, the rotor satisfies the following relationship:

[0016] According to some embodiments of the present invention, in a rotor, on the same cross section of the rotor, a line between the geometric center of the third permanent magnet and the center of the rotor core is a third line, a line between the geometric center of the first permanent magnet and the center of the rotor core is a first line, and a line between the geometric center of the seventh permanent magnet and the center of the rotor core is a seventh line; an angle between the third line and the d-axis is α3, an angle between the first line and the d-axis is α1, and an angle between the seventh line and the d-axis is α7, and the rotor satisfies the following relationship:

[0017] According to some embodiments of the present invention, the rotor satisfies the following relationship:

[0018] According to some embodiments of the present invention, in a rotor, on the same cross section of the rotor, a line between the geometric center of the third permanent magnet and the center of the rotor core is a third line, a line between the geometric center of the first permanent magnet and the center of the rotor core is a first line, and a line between the geometric center of the seventh permanent magnet and the center of the rotor core is a seventh line; an angle between the third line and the d-axis is α3, an angle between the first line and the d-axis is α1, an angle between the seventh line and the d-axis is α7, a radial width of the first permanent magnet is W1, a radial width of the third permanent magnet is W3, and the rotor satisfies the following relationship:

[0019] According to some embodiments of the present invention, the rotor satisfies the following relationship:

[0020] According to some embodiments of the rotor of the present invention, on the same cross section of the rotor, the line between the geometric center of the fourth permanent magnet and the center of the rotor core is the fourth line, the line between the geometric center of the sixth permanent magnet and the center of the rotor core is the sixth line, the line between the geometric center of the fifth permanent magnet and the center of the rotor core is the fifth line, the angle between the fifth line and the d-axis is α5, the angle between the sixth line and the d-axis is α6, the angle between the fourth line and the d-axis is α4, the radial width of the third permanent magnet is W3, and the circumferential width of the fifth permanent magnet is W5, wherein the rotor satisfies the following relationship:

[0021] According to some embodiments of the present invention, the rotor satisfies the following relationship:

[0022] The invention also provides a motor.

[0023] A motor according to an embodiment of the present invention comprises a rotor according to any of the above embodiments.

[0024] According to the motor of the embodiment of the present invention, a first permanent magnet group, a second permanent magnet group and a third permanent magnet group are installed on the rotor core, and the first permanent magnet group, the second permanent magnet group and the third permanent magnet group all include segmented permanent magnets, thereby reducing the cogging torque generated by the rotor core during rotation, thereby reducing the torque fluctuation caused by the cogging torque, reducing the jitter problem caused by the unstable output caused by the torque fluctuation, and helping to improve the NVH performance and improve the reliability of the motor.

[0025] The present invention further provides a vehicle.

[0026] A vehicle according to an embodiment of the present invention comprises the motor according to any one of the above embodiments.

[0027] According to the vehicle of the embodiment of the present invention, a first permanent magnet group, a second permanent magnet group and a third permanent magnet group are installed on the rotor core, and the first permanent magnet group, the second permanent magnet group and the third permanent magnet group are all arranged to include segmented permanent magnets, thereby reducing the cogging torque generated by the rotor core during rotation, thereby reducing the torque fluctuation caused by the cogging torque, reducing the jitter problem caused by the unstable output caused by the torque fluctuation, and helping to improve the NVH performance, improve the reliability of the motor, and improve the overall performance of the vehicle.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 is a schematic diagram of a rotor according to an embodiment of the present invention;

[0031] Figure 2 is a side view of a rotor according to an embodiment of the present invention;

[0032] Figure 3 is a partial schematic diagram of a rotor according to Embodiment 1 of the present invention;

[0033] Figure 4 is a partial schematic diagram of a rotor according to a second embodiment of the present invention;

[0034] Figure 5 is a partial schematic diagram of a rotor according to Embodiment 3 of the present invention;

[0035] Figure 6 is a partial schematic diagram of a rotor according to a fourth embodiment of the present invention;

[0036] Figure 7 It is a schematic diagram of the cogging torque using hybrid permanent magnets with uneven segmentation in the prior art;

[0037] Figure 8 It is a schematic diagram of torque fluctuation using hybrid permanent magnet uneven segmentation in the prior art;

[0038] Fig. 9 It is a schematic diagram of the cogging torque using uneven segmentation of the same type of rare earth permanent magnets in the prior art;

[0039] Fig.10 It is a schematic diagram of torque fluctuation using uneven segmentation of the same type of rare earth permanent magnets in the prior art.

[0040] Reference numerals:

[0041] Rotor 100,

[0042] Rotor core 1, first permanent magnet group 2, first part 21, first permanent magnet 211, second permanent magnet 212, second part 22, third permanent magnet 221, fourth permanent magnet 222,

[0043] The second permanent magnet group 3 , the fifth permanent magnet 31 , the sixth permanent magnet 32 ​​, the seventh permanent magnet 33 , and the third permanent magnet group 4 . DETAILED DESCRIPTION

[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Hereinafter, a rotor 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0048] like Figure 1-Figure 10As shown, the rotor 100 according to the embodiment of the present invention comprises: a rotor core 1, a plurality of first permanent magnet groups 2, a plurality of second permanent magnet groups 3 and a plurality of third permanent magnet groups 4, wherein the plurality of first permanent magnet groups 2 are arranged at intervals on the rotor core 1 along the circumferential direction of the rotor core 1, and each first permanent magnet group 2 is arranged perpendicular to the d-axis of the rotor 100; the plurality of second permanent magnet groups 3 are arranged at intervals on the rotor core 1 along the circumferential direction of the rotor core 1, and the first permanent magnet groups 2 are located radially outside the second permanent magnet groups 3; the plurality of third permanent magnet groups 4 ... The rotor core 1 is circumferentially spaced apart on the rotor core 1, the first permanent magnet group 2 is located radially outside the third permanent magnet group 4, the second permanent magnet group 3 and the third permanent magnet group 4 are respectively arranged on both sides of the circumference of each first permanent magnet group 2, the remanence of each first permanent magnet group 2 is greater than the remanence of the corresponding second permanent magnet group 3, the remanence of each first permanent magnet group 2 is greater than the remanence of the corresponding third permanent magnet group 4, and the material of each first permanent magnet group 2 is different from the material of the corresponding second permanent magnet group 3 and the third permanent magnet group 4.

[0049] Therefore, by arranging the first permanent magnet group 2, the second permanent magnet group 3 and the third permanent magnet group 4 at intervals in the circumferential direction of the rotor core 1, the cogging torque generated by the rotor 100 during rotation is reduced, thereby reducing the torque fluctuation caused by the cogging torque, reducing the jitter caused by the torque fluctuation, and improving the NVH performance. And by setting the remanence of the first permanent magnet group 2 to be higher than the remanence of the second permanent magnet group 3 and the third permanent magnet group 4, for example, setting the second permanent magnet group 3 and the third permanent magnet group 4 to be ferrite magnets, such a setting reduces the amount of rare earth magnets in the rotor 100, reduces the cost of the rotor 100, and allows the ferrite magnets to protect the rare earth magnets to reduce the risk of demagnetization of the rare earth magnets.

[0050] Figure 7 This is the cogging torque waveform of the original solution, with a value of 68.6Mnm. Figure 8 This is the torque waveform of the original solution at 16000rpm, with a torque fluctuation of 37.4%. Fig. 9 This is the cogging torque waveform when the permanent magnet is not segmented in the original solution, and the value is 69.1mNM. Fig.10 This is the torque waveform at 16000rpm when the permanent magnet is not segmented in the original scheme, and the torque fluctuation is 38.6%. The value of the cogging torque cannot be intuitively obtained in this figure, but it is the relevant data recorded during the experiment. However, it is undoubtedly possible for those skilled in the art to obtain the relevant cogging torque value through this waveform.

[0051] According to the simulation results, under the same conditions, the cogging torque of the permanent magnet is reduced by 0.5Mnm after uneven segmentation compared with the permanent magnet without segmentation, that is, the cogging torque is reduced by 0.7%, and the torque fluctuation value is reduced by 1.2%.

[0052] For example, refer to Figure 1-Figure 2 As shown, the rotor 100 includes a rotor core 1, which is constructed as an annular structure. The rotor core 1 is formed by stacking a plurality of steel sheets in sequence along the axial direction. The rotor core 1 is provided with a plurality of mounting slot groups, which are evenly spaced along the circumference of the rotor core 1. Each mounting slot group includes a plurality of mounting slots spaced apart, and a permanent magnet group is installed in each mounting slot of a single group.

[0053] Among them, Figure 3 As shown, the mounting slot group is provided with a first mounting slot, and the rotor 100 is provided with a plurality of first permanent magnet groups 2. The plurality of first permanent magnet groups 2 are respectively installed in the first mounting slots of the plurality of mounting slot groups, so that the plurality of first permanent magnet groups 2 can be evenly spaced apart and arranged along the circumferential direction of the rotor 100, the first permanent magnet group 2 is located radially outside the rotor core 1 and extends in a direction perpendicular to the d-axis of the rotor 100, and the first permanent magnet group 2 is symmetrically arranged about the d-axis.

[0054] At the same time, the installation slot group may be provided with a second installation slot and a third installation slot, and the rotor 100 may be provided with a plurality of second permanent magnet groups 3 and a plurality of third permanent magnet groups 4, and the plurality of second permanent magnet groups 3 may be respectively installed in the second installation slots of the plurality of installation slot groups, so that the plurality of second permanent magnet groups 3 may be evenly spaced and arranged along the circumference of the rotor 100, and the plurality of third permanent magnet groups 4 may be respectively installed in the third installation slots of the plurality of installation slot groups, so that the plurality of third permanent magnet groups 4 may be evenly spaced and arranged along the circumference of the rotor 100. The second permanent magnet group 3 and the third permanent magnet group 4 are both arranged radially inward of the first permanent magnet group 2, and the second permanent magnet group 3 and the third permanent magnet group 4 are respectively arranged on both sides of the circumference of the first permanent magnet group 2, so that the first permanent magnet group 2, the second permanent magnet group 3 and the third permanent magnet group 4 are evenly distributed.

[0055] It should be noted that, according to the principle of superposition method, the total cogging torque of each pole of the motor can be simplified to the superposition of the cogging torque generated by each permanent magnet, satisfying:

[0056]

[0057] Where: Ns is the number of segments of the permanent magnet; Tn is the amplitude of the cogging torque of the nth harmonic; Np is the number of cogging torque cycles of one pitch; Z is the number of slots; Δβ is the offset angle between two adjacent segments of the permanent magnet. The number of cogging torque cycles of one pitch: Np = 2p / GCD (Z, 2p), where: GCD (Z, 2p) represents the greatest common divisor of Z and 2p. It can be seen from the above formula that by changing the number of segments Ns of the permanent magnet, the total cogging torque of each pole can be effectively weakened.

[0058] Therefore, by installing the first permanent magnet group 2, the second permanent magnet group 3 and the third permanent magnet group 4 spaced apart on the circumference of the rotor core 1, the cogging torque generated by the rotor core 1 during rotation can be reduced, thereby reducing the torque fluctuation caused by the cogging torque, reducing the jitter problem caused by the unstable output caused by the torque fluctuation, and helping to improve the NVH performance.

[0059] Among them, the remanence of each first permanent magnet group 2 is greater than the remanence of the corresponding second permanent magnet group 3, the remanence of each first permanent magnet group 2 is greater than the remanence of the corresponding third permanent magnet group 4, and the material of each first permanent magnet group 2 is different from the material of the corresponding second permanent magnet group 3 and the third permanent magnet group 4, such as the first permanent magnet group 2 can be set as a rare earth permanent magnet, and the second permanent magnet group 3 and the third permanent magnet group 4 can be set as a ferrite permanent magnet; or, the first permanent magnet group 2 can be set as a ferrite permanent magnet, and the second permanent magnet group 3 and the third permanent magnet group 4 can be set as a ferrite permanent magnet; or permanent magnets of the same type but with different remanences can be satisfied, and the remanence of the permanent magnets of the first permanent magnet group 2 is high, and the remanence of the permanent magnets of the second permanent magnet group 3 and the third permanent magnet group 4 is low, and this application does not limit this. Thus, the possibility of demagnetization of rare earth permanent magnets is reduced, which is conducive to reducing the amount of rare earth permanent magnets, reducing costs, and meeting the output torque and output power performance requirements of the motor.

[0060] It should be noted that the same permanent magnet material means that the components contained in the permanent magnet are exactly the same. Otherwise, they are all permanent magnets of different materials, such as the following situations:

[0061] 1. Permanent magnets are of different types. For example, ferrite magnets and NdFeB magnets are permanent magnets of different types and materials. Rare earth materials such as samarium cobalt magnets and NdFeB magnets also belong to this situation, that is, permanent magnets of different types and materials.

[0062] 2. Permanent magnets of the same model but different grades also belong to permanent magnets of different materials. For example, they are all aluminum-cobalt-nickel magnets, but the same volume of aluminum-cobalt-nickel magnets will have different performances due to the different proportions of aluminum, cobalt, and nickel. Therefore, grades are added to aluminum-cobalt-nickel to identify the performance of the magnets for different output remanence and other properties. For example, LNG13 and LNG32, where L stands for aluminum, N stands for nickel, and G stands for cobalt. The remanence of LNG13 is 0.68, while the remanence of LNG32 is 1.2. Therefore, the remanence performance of LNG32 is better than that of LNG13, but the cost of LNG32 is higher than that of LNG13.

[0063] The above description is only an example of different materials. As long as the two permanent magnets contain different components, they can be considered as permanent magnets of different materials in the present application.

[0064] Alternatively, if Figure 6As shown, the size of the first installation groove can be set larger than the size of the first permanent magnet group 2, which is conducive to reducing the difficulty of installing the first permanent magnet group 2. When the rotor 100 rotates at high speed, deformation space of the first permanent magnet group 2 is reserved, reducing the possibility of the first permanent magnet group 2 detaching from the rotor 100.

[0065] In some embodiments of the present invention, reference Figure 1 As shown, each first permanent magnet group 2, each second permanent magnet group 3 and each third permanent magnet group 4 can be provided to include segmented permanent magnets. For example, each first permanent magnet group 2, each second permanent magnet group 3 and each third permanent magnet group 4 can be provided to include segmented permanent magnets, so that the cogging torque generated by the rotor core 1 during rotation can be reduced, thereby reducing the torque fluctuation caused by the cogging torque, reducing the jitter problem caused by the unstable output caused by the torque fluctuation, and helping to improve the NVH performance.

[0066] It should be noted that the permanent magnet can be segmented uniformly or unevenly. When the permanent magnet is segmented unevenly, compared with uniform segmentation, the no-load back EMF waveform and the air gap magnetic flux waveform are closer to a sine waveform, the motor cogging torque is smaller, the torque fluctuation is smaller, and the motor jitter and noise are smaller.

[0067] In some embodiments of the present invention, each first permanent magnet group 2 includes a first portion 21 and a second portion 22 , wherein the first portion 21 is located radially outside the second portion 22 , and a circumferential length of the first portion 21 is smaller than a circumferential length of the second portion 22 .

[0068] For example, Figure 3 As shown, the first permanent magnet group 2 can be divided into a first part 21 and a second part 22, the first part 21 is located radially outside the second part 22 and the first part 21 and the second part 22 are stacked, the circumferential length of the first part 21 is smaller than the circumferential length of the second part 22, so that the volume of the first part 21 is smaller than the volume of the second part 22. In this way, when the motor runs at high speed, the centrifugal force on the first part 21 is small, and it is not easy to sweep the bore, and the first part 21 is used to support the second part 22, so that the second part 22 is less likely to sweep the bore. In this way, the possibility of the first part 21 or the second part 22 detaching from the rotor 100 can be reduced, the safety and reliability of the rotor 100 are improved, and when the first part 21 and the second part 22 are arranged as above, the synthetic air gap magnetic flux is closer to the center of the air gap in the air gap, and the performance of the permanent magnet can be fully utilized.

[0069] In some embodiments of the present invention, the first portion 21 includes a first permanent magnet 211 and a second permanent magnet 212 that are arranged in sections; and / or the second portion 22 includes a third permanent magnet 221 and a fourth permanent magnet 222 that are arranged in sections.

[0070] For example, refer to Figure 3 As shown, the first part 21 can be provided to include a first permanent magnet 211 and a second permanent magnet 212, the first permanent magnet 211 and the second permanent magnet 212 are provided in segments, the first permanent magnet 211 and the second permanent magnet 212 are arranged in sequence along the circumference of the rotor core 1, the radial width of the first permanent magnet 211 is equal to the radial width of the second permanent magnet 212, so that the end of the first permanent magnet 211 along the length direction can be opposite to the end of the second permanent magnet 212 along the length direction, and can be connected by gluing or welding. At the same time, the second part 22 can be set to include a third permanent magnet 221 and a fourth permanent magnet 222, and the third permanent magnet 221 and the fourth permanent magnet 222 are arranged in segments, and the third permanent magnet 221 and the fourth permanent magnet 222 are arranged in sequence along the circumference of the rotor core 1, and the radial width of the third permanent magnet 221 is equal to the radial width of the fourth permanent magnet 222, so that the end of the third permanent magnet 221 along the length direction can be opposite to the end of the fourth permanent magnet 222 along the length direction, and can be connected by gluing or welding.

[0071] Through the above arrangement, the first permanent magnet group 2 has multiple permanent magnets, which is beneficial to reducing the cogging torque, thereby reducing the torque fluctuation caused by the cogging torque, reducing the jitter problem caused by the unstable output caused by the torque fluctuation, and is beneficial to improving the NVH performance.

[0072] In some embodiments of the present invention, the length of the first permanent magnet 211 is different from the length of the second permanent magnet 212, and the length of the third permanent magnet 221 is different from the length of the fourth permanent magnet 222. Figure 3 and Figure 5 As shown, the first permanent magnet 211 and the second permanent magnet 212 can be set to have different lengths, such as the length ratio of the first permanent magnet 211 and the second permanent magnet 212 can be set to 1:2 or 2:1; at the same time, the third permanent magnet 221 and the fourth permanent magnet 222 can be set to have different lengths, such as the length ratio of the third permanent magnet 221 and the fourth permanent magnet 222 can be set to 1:2 or 2:1. In this way, the uneven segmentation of the first part 21 and the second part 22 is achieved. Compared with the uniform segmentation, the no-load back electromotive force waveform and the air gap magnetic flux waveform are closer to the sine waveform, the motor cogging torque is smaller, the torque fluctuation is smaller, and the motor jitter and noise are smaller.

[0073] It should be noted that the length range of the first permanent magnet 211, the second permanent magnet 212, the third permanent magnet 221 and the fourth permanent magnet 222 can be set to 2mm-7mm to avoid the length of the first permanent magnet 211, the second permanent magnet 212, the third permanent magnet 221 and the fourth permanent magnet 222 being too large or too small, which is beneficial to improving the reliability of the rotor 100.

[0074] In some embodiments of the present invention, the d-axis passes through the second permanent magnet 212 and the fourth permanent magnet 222. For example, referring to Figure 3 As shown, the length of the second permanent magnet 212 can be set to be greater than the length of the first permanent magnet 211, and the length of the fourth permanent magnet 222 can be set to be greater than the length of the third permanent magnet 221, so that the d-axis can pass through the second permanent magnet 212 and the fourth permanent magnet 222 in sequence. In this way, the first part 21 and the second part 22 have similar structures, and when the motor runs at high speed, the first part 21 can better support the second part 22. As a result, the reliability of the rotor 100 is improved.

[0075] Optionally, refer to Figure 5 As shown, the length of the second permanent magnet 212 can be set greater than the length of the first permanent magnet 211, and the length of the third permanent magnet 221 can be set greater than the length of the fourth permanent magnet 222, so that the d-axis can pass through the second permanent magnet 212 and the third permanent magnet 221 to meet different working conditions.

[0076] In some embodiments of the present invention, the second permanent magnet group 3 and the third permanent magnet group 4 corresponding to each first permanent magnet group 2 are symmetrically arranged about the d axis, and the second permanent magnet group 3 includes a fifth permanent magnet 31 and a sixth permanent magnet 32, and the fifth permanent magnet 31 is located on one circumferential side of the sixth permanent magnet 32.

[0077] For example, refer to Figure 3-Figure 5 As shown, the second permanent magnet group 3 and the third permanent magnet group 4 can be respectively arranged on both sides of each first permanent magnet group 2, and the corresponding second permanent magnet group 3 and the third permanent magnet group 4 are symmetrically arranged about the d axis, so that the first permanent magnet group 2, the second permanent magnet group 3 and the third permanent magnet group 4 can be symmetrically arranged along the d axis. At the same time, the second permanent magnet group 3 and the third permanent magnet group 4 can both include a fifth permanent magnet 31 and a sixth permanent magnet 32, the fifth permanent magnet 31 is located on one side of the circumferential direction of the sixth permanent magnet 32, and the radial width of the fifth permanent magnet 31 is equal to the radial width of the sixth permanent magnet 32, so that the end of the fifth permanent magnet 31 along the length direction can be directly opposite to the end of the sixth permanent magnet 32 ​​along the length direction, and can be connected by gluing or welding. Among them, the fifth permanent magnet 31 and the sixth permanent magnet 32 ​​can be segmented uniformly or non-uniformly. When the fifth permanent magnet 31 and the sixth permanent magnet 32 ​​are segmented non-uniformly, the ratio of the length of the fifth permanent magnet 31 to the length of the sixth permanent magnet 32 ​​can be set to 1:2, or set to 2:1, and the present application does not impose any restrictions on this.

[0078] The above arrangement helps to reduce the cogging torque, reduces the torque fluctuation caused by the cogging torque, reduces the jitter problem caused by the unstable output caused by the torque fluctuation, and helps to improve the NVH performance.

[0079] In some embodiments of the present invention, the second permanent magnet group 3 further includes a seventh permanent magnet 33. In the circumferential direction of the rotor 100 and in the direction toward the d-axis, the seventh permanent magnet 33, the fifth permanent magnet 31 and the sixth permanent magnet 32 ​​are sequentially arranged. Figure 3 As shown, the second permanent magnet group 3 may be provided with a seventh permanent magnet 33, and the seventh permanent magnet 33 is provided at one end of the fifth permanent magnet 31 away from the sixth permanent magnet 32, so that in the circumferential direction of the rotor 100 and in the direction toward the d-axis, the seventh permanent magnet 33, the fifth permanent magnet 31 and the sixth permanent magnet 32 ​​of the second permanent magnet group 3 may be arranged in sequence to divide the second permanent magnet group 3 into three permanent magnets. Correspondingly, the third permanent magnet group 4 may be provided with a seventh permanent magnet 33, and the seventh permanent magnet 33 is provided at one end of the fifth permanent magnet 31 away from the sixth permanent magnet 32, so that in the circumferential direction of the rotor 100 and in the direction toward the d-axis, the seventh permanent magnet 33, the fifth permanent magnet 31 and the sixth permanent magnet 32 ​​of the third permanent magnet group 4 may be arranged in sequence to divide the second permanent magnet group 3 into three permanent magnets.

[0080] Through the above arrangement, the number of permanent magnets in the second permanent magnet group 3 and the third permanent magnet group 4 is increased, which is beneficial to reducing the cogging torque, reducing the torque fluctuation caused by the cogging torque, reducing the jitter problem caused by unstable output caused by torque fluctuation, and is beneficial to improving NVH performance.

[0081] In some embodiments of the present invention, the seventh permanent magnet 33 and the fifth permanent magnet 31 are made of different materials, and the radial length of the seventh permanent magnet 33 is smaller than the radial length of the fifth permanent magnet 31. Figure 3 As shown, the fifth permanent magnet 31 can be set as a ferrite permanent magnet, and the seventh permanent magnet 33 can be set as a rare earth permanent magnet. The performance of the rare earth permanent magnet is better than that of the ferrite permanent magnet. The radial length of the seventh permanent magnet 33 can be smaller than the radial length of the fifth permanent magnet 31, so that the volume of the seventh permanent magnet 33 is smaller but the performance remains unchanged, so that the seventh permanent magnet 33 can be regarded as a ferrite permanent magnet with a radial length equal to the radial length of the fifth permanent magnet 31. Thus, it is beneficial to reduce the space occupied by the seventh permanent magnet 33, so as to realize the layout of the second permanent magnet group 3 and the third permanent magnet group 4, and it is beneficial to reduce the cost of the seventh permanent magnet 33.

[0082] In some embodiments of the present invention, on the same cross section of the rotor 100, the line between the geometric center of the second permanent magnet 212 and the center of the rotor core 1 is the second line, the line between the geometric center of the sixth permanent magnet 32 ​​and the center of the rotor core 1 is the sixth line, the line between the geometric center of the seventh permanent magnet 33 and the center of the rotor core 1 is the seventh line, the angle between the second line and the d-axis is α2, the angle between the sixth line and the d-axis is α6, the angle between the seventh line and the d-axis is α7, the radial width of the first permanent magnet 211 is W1, and the circumferential width of the seventh permanent magnet 33 is W7, wherein the rotor 100 satisfies the following relationship:

[0083] For example, refer to Figure 3 As shown, the rotor 100 is provided with a d-axis, the first permanent magnet group 2 is symmetrically arranged about the d-axis, and the second permanent magnet group 3 and the third permanent magnet group 4 are symmetrically distributed about the d-axis. On the same cross section of the rotor 100, the geometric center of the second permanent magnet 212 is located on one side of the d-axis, and the line between the geometric center of the second permanent magnet 212 and the center of the rotor core 1 can be set as the second line, and the second line has an angle with the d-axis, and the angle between the second line and the d-axis is set to α2; the geometric center of the sixth permanent magnet 32 ​​is located on one side of the d-axis, and the line between the geometric center of the sixth permanent magnet 32 ​​and the center of the rotor core 1 can be set as the sixth line, and the sixth line has an angle with the d-axis, and the angle between the sixth line and the d-axis is set to α6; the geometric center of the seventh permanent magnet 33 is located on one side of the d-axis, and the line between the geometric center of the seventh permanent magnet 33 and the center of the rotor core 1 can be set as the seventh line, and the seventh line has an angle with the d-axis, and the angle between the seventh line and the d-axis is set to α7. Meanwhile, the radial width of the first permanent magnet 211 may be set to W1, and the circumferential width of the seventh permanent magnet 33 may be set to W7.

[0084] The rotor 100 satisfies the following relationship: That is, the ratio between the radial width of the first permanent magnet 211 and the radial width of the seventh permanent magnet 33 can be set to be greater than or equal to 0.8 times. and less than or equal to 3.1 times By changing the angle between the line between the geometric center of the permanent magnet and the center of the rotor core 1 and the d-axis, it is equivalent to changing the pole arc coefficient of the rotor 100. The pole arc coefficient has an optimal range. Within this range, the air gap flux waveform is closest to a sine wave, the torque fluctuation is small, and the cogging torque has a smaller range. Therefore, by changing the angle between the geometric center of the permanent magnet and the d-axis and combining the width of the permanent magnet, the rationality of the permanent magnet layout is improved, which is conducive to reducing the torque fluctuation of the rotor 100, improving the NVH performance, and also improving the anti-demagnetization performance of the permanent magnet.

[0085] In a more preferred embodiment, the rotor 100 satisfies the following relationship: Its effect is more obvious than the above content.

[0086] In some embodiments of the present invention, on the same cross section of the rotor 100, the line between the geometric center of the third permanent magnet 221 and the center of the rotor core 1 is the third line, the line between the geometric center of the first permanent magnet 211 and the center of the rotor core 1 is the first line, and the line between the geometric center of the seventh permanent magnet 33 and the center of the rotor core 1 is the seventh line; the angle between the third line and the d-axis is α3, the angle between the first line and the d-axis is α1, and the angle between the seventh line and the d-axis is α7, and the rotor 100 satisfies the following relationship:

[0087] For example, refer to Figure 3 As shown, the rotor 100 is provided with a d-axis, the first permanent magnet group 2 is symmetrically arranged about the d-axis, and the second permanent magnet group 3 and the third permanent magnet group 4 are symmetrically distributed about the d-axis. On the same cross section of the rotor 100, the geometric center of the third permanent magnet 221 is located on one side of the d-axis, and the line between the geometric center of the third permanent magnet 221 and the center of the rotor core 1 can be set to the third line, the third line has an angle with the d-axis, and the angle between the third line and the d-axis is set to α3; the geometric center of the first permanent magnet 211 is located on one side of the d-axis, and the line between the geometric center of the first permanent magnet 211 and the center of the rotor core 1 can be set to the first line, the first line has an angle with the d-axis, and the angle between the first line and the d-axis is set to α1; the geometric center of the seventh permanent magnet 33 is located on one side of the d-axis, and the line between the geometric center of the seventh permanent magnet 33 and the center of the rotor core 1 can be set to the seventh line, the seventh line has an angle with the d-axis, and the angle between the seventh line and the d-axis is set to α7.

[0088] The rotor 100 satisfies the following relationship: That is, the ratio of the cosine function of the angle between the three first connecting lines and the d-axis to the cosine function of the angle between the three seventh connecting lines and the d-axis can be set to be greater than or equal to 2.4 times. and less than or equal to 1.3 times By changing the angle between the line between the geometric center of the permanent magnet and the center of the rotor core 1 and the d-axis, it is equivalent to changing the pole arc coefficient of the rotor 100. The pole arc coefficient has an optimal range. Within this range, the air gap flux waveform is closest to a sine wave, the torque fluctuation is small, and the cogging torque has a smaller range. Therefore, by changing the angle between the geometric center of the permanent magnet and the d-axis and combining the width of the permanent magnet, the rationality of the permanent magnet layout is improved, which is conducive to reducing the torque fluctuation of the rotor 100, improving the NVH performance, and also improving the anti-demagnetization performance of the permanent magnet.

[0089] In a more preferred embodiment, the rotor 100 satisfies the following relationship: Its effect is more obvious than the above content.

[0090] In some embodiments of the present invention, on the same cross-section of the rotor 100, the line between the geometric center of the third permanent magnet 221 and the center of the rotor core 1 is the third line, the line between the geometric center of the first permanent magnet 211 and the center of the rotor core 1 is the first line, and the line between the geometric center of the seventh permanent magnet 33 and the center of the rotor core 1 is the seventh line; the angle between the third line and the d-axis is α3, the angle between the first line and the d-axis is α1, the angle between the seventh line and the d-axis is α7, the radial width of the first permanent magnet 211 is W1, and the radial width of the third permanent magnet 221 is W3.

[0091] For example, refer to Figure 3 As shown, the rotor 100 is provided with a d-axis, the first permanent magnet group 2 is symmetrically arranged about the d-axis, and the second permanent magnet group 3 and the third permanent magnet group 4 are symmetrically distributed about the d-axis. On the same cross section of the rotor 100, the geometric center of the third permanent magnet 221 is located on one side of the d-axis, and the line between the geometric center of the third permanent magnet 221 and the center of the rotor core 1 can be set as the third line, and the third line has an angle with the d-axis, and the angle between the third line and the d-axis is set to α3; the geometric center of the first permanent magnet 211 is located on one side of the d-axis, and the line between the geometric center of the first permanent magnet 211 and the center of the rotor core 1 can be set as the first line, and the first line has an angle with the d-axis, and the angle between the first line and the d-axis is set to α1; the geometric center of the seventh permanent magnet 33 is located on one side of the d-axis, and the line between the geometric center of the seventh permanent magnet 33 and the center of the rotor core 1 can be set as the seventh line, and the seventh line has an angle with the d-axis, and the angle between the seventh line and the d-axis is set to α7. Meanwhile, the radial width of the first permanent magnet 211 may be set to W1, and the circumferential width of the third permanent magnet 221 may be set to W3.

[0092] The rotor 100 satisfies the following relationship: That is, the ratio of the radial width of the third permanent magnet 221 to the radial width of the first permanent magnet 211 can be set to be greater than or equal to 2.83 times. and less than or equal to 1.2 times By changing the angle between the line between the geometric center of the permanent magnet and the center of the rotor core 1 and the d-axis, it is equivalent to changing the pole arc coefficient of the rotor 100. The pole arc coefficient has an optimal range. Within this range, the air gap flux waveform is closest to a sine wave, the torque fluctuation is small, and the cogging torque has a smaller range. Therefore, by changing the angle between the geometric center of the permanent magnet and the d-axis and combining the width of the permanent magnet, the rationality of the permanent magnet layout is improved, which is conducive to reducing the torque fluctuation of the rotor 100, improving the NVH performance, and also improving the anti-demagnetization performance of the permanent magnet.

[0093] In a more preferred embodiment, the rotor 100 satisfies the following relationship: Its effect is more obvious than the above content.

[0094] In some embodiments of the present invention, on the same cross section of the rotor 100, the line between the geometric center of the fourth permanent magnet 222 and the center of the rotor core 1 is the fourth line, the line between the geometric center of the sixth permanent magnet 32 ​​and the center of the rotor core 1 is the sixth line, the line between the geometric center of the fifth permanent magnet 31 and the center of the rotor core 1 is the fifth line, the angle between the fifth line and the d-axis is α5, the angle between the sixth line and the d-axis is α6, the angle between the fourth line and the d-axis is α4, the radial width of the third permanent magnet 221 is W3, and the circumferential width of the fifth permanent magnet 31 is W5, wherein the rotor 100 satisfies the following relationship:

[0095] For example, refer to Figure 3As shown, the rotor 100 is provided with a d-axis, the first permanent magnet group 2 is symmetrically arranged about the d-axis, and the second permanent magnet group 3 and the third permanent magnet group 4 are symmetrically distributed about the d-axis. On the same cross section of the rotor 100, the geometric center of the fourth permanent magnet 222 is located on one side of the d-axis, and the line between the geometric center of the fourth permanent magnet 222 and the center of the rotor core 1 can be set as a fourth line, and the fourth line has an angle with the d-axis, and the angle between the fourth line and the d-axis is set to α4; the geometric center of the fifth permanent magnet 31 is located on one side of the d-axis, and the line between the geometric center of the fifth permanent magnet 31 and the center of the rotor core 1 can be set as a fifth line, and the fifth line has an angle with the d-axis, and the angle between the fifth line and the d-axis is set to α5; the geometric center of the sixth permanent magnet 32 ​​is located on one side of the d-axis, and the line between the geometric center of the sixth permanent magnet 32 ​​and the center of the rotor core 1 can be set as a sixth line, and the sixth line has an angle with the d-axis, and the angle between the sixth line and the d-axis is set to α6. Meanwhile, the radial width of the third permanent magnet 221 may be set to W3, and the circumferential width of the fifth permanent magnet 31 may be set to W5.

[0096] The rotor 100 satisfies the following relationship: That is, the ratio between the radial width of the fifth permanent magnet 31 and the radial width of the third permanent magnet 221 can be set to be greater than or equal to 2.82 times. and less than or equal to 3.5 times By changing the angle between the line between the geometric center of the permanent magnet and the center of the rotor core 1 and the d-axis, it is equivalent to changing the pole arc coefficient of the rotor 100. The pole arc coefficient has an optimal range. Within this range, the air gap flux waveform is closest to a sine wave, the torque fluctuation is small, and the cogging torque has a smaller range. Therefore, by changing the angle between the geometric center of the permanent magnet and the d-axis and combining the width of the permanent magnet, the rationality of the permanent magnet layout is improved, which is conducive to reducing the torque fluctuation of the rotor 100, improving the NVH performance, and also improving the anti-demagnetization performance of the permanent magnet.

[0097] In a more preferred embodiment, the rotor 100 satisfies the following relationship: Its effect is more obvious than the above content.

[0098] It should be noted that when the rotor core 1 is provided with a first permanent magnet group 2, a second permanent magnet group 3 and a third permanent magnet group 4, and the first permanent magnet group 2 has a first part 21 and a second part 22, the first part 21 has a first permanent magnet 211 and a second permanent magnet 212, the second part 22 has a third permanent magnet 221 and a fourth permanent magnet 222, the second permanent magnet group 3 and the third permanent magnet group 4 are symmetrically arranged about the d axis, and both have a fifth permanent magnet 31, a sixth permanent magnet 32 ​​and a seventh permanent magnet 33, if the following conditions are met at the same time:

[0099] (1)

[0100] (2)

[0101] (3)

[0102] (4)

[0103] Taking into account anti-demagnetization, reduction of torque fluctuation and improvement of NVH performance, the motor has the best overall performance.

[0104] Specifically, refer to Figure 7-10 As shown in the figure, when α1, α2, and α3 are changed, the air gap magnetic field of the motor is changed, and the load torque and NVH performance will be affected. When the above angle changes from small to large, the arc length spanned by the permanent magnet changes, thereby affecting the air gap magnetic density of the motor. The air gap magnetic density will fluctuate, the output power of the motor will fluctuate, and the NVH performance of the motor will fluctuate. There is an optimal coefficient range for the above angle, as shown in the above parameter expression. When within the above parameter range, the load torque and NVH performance of the motor are the best.

[0105] When W1, W2, W3, W4, W5, W6, and W7 are increased, the cost of the permanent magnet increases, affecting the working point of the permanent magnet, but the motor's anti-demagnetization ability is enhanced. When W1, W2, W3, W4, W5, W6, and W7 are reduced, the permanent magnet's anti-demagnetization ability is reduced, affecting the motor's output torque.

[0106] When W1, W2, W3, W4, W5, W6, and W7 change, the permanent magnet cost, anti-demagnetization ability, load torque, and NVH performance will fluctuate; α1, α2, α3, α4, α4, α6, and α7 will change with the permanent magnet width, affecting the pole arc coefficient of the motor, thereby affecting the motor's load torque and NVH performance. The pole arc coefficient has an optimal range. When the above parameter relationship is met, the pole arc coefficient is within the optimal range, and the motor's load torque and NVH performance are the best.

[0107] In summary, the restriction range in the above parameter relationship should be met. At this time, the motor performance is the best considering all factors.

[0108] The invention also provides a motor.

[0109] The motor according to the embodiment of the present invention includes the rotor 100 of any of the above embodiments. The first permanent magnet group 2, the second permanent magnet group 3 and the third permanent magnet group 4 can be installed on the rotor core 1, and the first permanent magnet group 2, the second permanent magnet group 3 and the third permanent magnet group 4 are all provided with segmented permanent magnets, so as to reduce the cogging torque generated by the rotor core 1 during rotation, thereby reducing the torque fluctuation caused by the cogging torque, reducing the jitter problem caused by the unstable output caused by the torque fluctuation, and improving the NVH performance and the reliability of the motor.

[0110] The present invention further provides a vehicle.

[0111] The vehicle according to the embodiment of the present invention includes the motor of any of the above embodiments. The first permanent magnet group 2, the second permanent magnet group 3 and the third permanent magnet group 4 can be installed on the rotor core 1, and the first permanent magnet group 2, the second permanent magnet group 3 and the third permanent magnet group 4 are all provided with segmented permanent magnets, so as to reduce the cogging torque generated by the rotor core 1 during rotation, thereby reducing the torque fluctuation caused by the cogging torque, reducing the jitter problem caused by the unstable output caused by the torque fluctuation, and improving the NVH performance, improving the reliability of the motor, and improving the overall performance of the vehicle.

[0112] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0113] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A rotor (100), characterized in that: include: A rotor core (1); A plurality of first permanent magnet groups (2), the plurality of first permanent magnet groups (2) being arranged on the rotor core (1) at intervals along the circumferential direction of the rotor core (1), and each of the first permanent magnet groups (2) being arranged perpendicular to the d-axis of the rotor (100); a plurality of second permanent magnet groups (3), the plurality of second permanent magnet groups (3) being arranged on the rotor core (1) at intervals along the circumferential direction of the rotor core (1), and the first permanent magnet group (2) being located radially outside the second permanent magnet group (3); A plurality of third permanent magnet groups (4), the plurality of third permanent magnet groups (4) being arranged on the rotor core (1) at intervals along the circumferential direction of the rotor core (1), the first permanent magnet group (2) being located radially outside the third permanent magnet group (4), the second permanent magnet group (3) and the third permanent magnet group (4) being arranged on both circumferential sides of each of the first permanent magnet groups (2), the remanence of each of the first permanent magnet groups (2) being greater than the remanence of the corresponding second permanent magnet group (3), and the remanence of each of the first permanent magnet groups (2) being greater than the remanence of the corresponding third permanent magnet group (4). magnetism, the material of each first permanent magnet group (2) is different from the material of the corresponding second permanent magnet group (3) and the third permanent magnet group (4), each of the first permanent magnet group (2), each of the second permanent magnet group (3) and each of the third permanent magnet group (4) comprises permanent magnets arranged in segments, each of the first permanent magnet groups (2) comprises a first portion (21) and a second portion (22), the first portion (21) is located radially outside the second portion (22), and the circumferential length of the first portion (21) is smaller than the circumferential length of the second portion (22); The first part (21) comprises a first permanent magnet (211) and a second permanent magnet (212) which are arranged in sections; and / or The second part (22) includes a third permanent magnet (221) and a fourth permanent magnet (222) which are arranged in sections; The length of the first permanent magnet (211) is different from the length of the second permanent magnet (212), and the length of the third permanent magnet (221) is different from the length of the fourth permanent magnet (222); The d-axis passes through the second permanent magnet (212) and the fourth permanent magnet (222); The second permanent magnet group (3) and the third permanent magnet group (4) corresponding to each of the first permanent magnet groups (2) are symmetrically arranged about the d axis, the second permanent magnet group (3) comprising a fifth permanent magnet (31) and a sixth permanent magnet (32), the fifth permanent magnet (31) being located on one circumferential side of the sixth permanent magnet (32); The second permanent magnet group (3) further comprises a seventh permanent magnet (33), and in the circumferential direction of the rotor (100) and in the direction toward the d-axis, the seventh permanent magnet (33), the fifth permanent magnet (31) and the sixth permanent magnet (32) are sequentially arranged; The seventh permanent magnet (33) and the fifth permanent magnet (31) are made of different materials, and the radial length of the seventh permanent magnet (33) is smaller than the radial length of the fifth permanent magnet (31).

2. The rotor (100) according to claim 1, characterized in that On the same cross section of the rotor (100), the line between the geometric center of the second permanent magnet (212) and the center of the rotor core (1) is the second line, the line between the geometric center of the sixth permanent magnet (32) and the center of the rotor core (1) is the sixth line, the line between the geometric center of the seventh permanent magnet (33) and the center of the rotor core (1) is the seventh line, the angle between the second line and the d-axis is α2, the angle between the sixth line and the d-axis is α6, the angle between the seventh line and the d-axis is α7, the radial width of the first permanent magnet (211) is W1, and the circumferential width of the seventh permanent magnet (33) is W7, wherein the rotor (100) satisfies the following relationship:

3. The rotor (100) according to claim 2, characterized in that The rotor (100) satisfies the following relationship:

4. The rotor (100) according to claim 1, characterized in that On the same cross section of the rotor (100), the line between the geometric center of the third permanent magnet (221) and the center of the rotor core (1) is the third line, the line between the geometric center of the first permanent magnet (211) and the center of the rotor core (1) is the first line, and the line between the geometric center of the seventh permanent magnet (33) and the center of the rotor core (1) is the seventh line; The angle between the third connecting line and the d-axis is α3, the angle between the first connecting line and the d-axis is α1, the angle between the seventh connecting line and the d-axis is α7, and the rotor (100) satisfies the following relationship:

5. The rotor (100) according to claim 4, characterized in that The rotor (100) satisfies the following relationship:

6. The rotor (100) according to claim 1, characterized in that On the same cross section of the rotor (100), the line between the geometric center of the third permanent magnet (221) and the center of the rotor core (1) is the third line, the line between the geometric center of the first permanent magnet (211) and the center of the rotor core (1) is the first line, and the line between the geometric center of the seventh permanent magnet (33) and the center of the rotor core (1) is the seventh line; The angle between the third connecting line and the d-axis is α3, the angle between the first connecting line and the d-axis is α1, the angle between the seventh connecting line and the d-axis is α7, the radial width of the first permanent magnet (211) is W1, the radial width of the third permanent magnet (221) is W3, and the rotor (100) satisfies the following relationship:

7. The rotor (100) according to claim 6, characterized in that The rotor (100) satisfies the following relationship:

8. The rotor (100) according to any one of claims 1 to 7, characterized in that: On the same cross section of the rotor (100), the line between the geometric center of the fourth permanent magnet (222) and the center of the rotor core (1) is the fourth line, the line between the geometric center of the sixth permanent magnet (32) and the center of the rotor core (1) is the sixth line, the line between the geometric center of the fifth permanent magnet (31) and the center of the rotor core (1) is the fifth line, the angle between the fifth line and the d-axis is α5, the angle between the sixth line and the d-axis is α6, the angle between the fourth line and the d-axis is α4, the radial width of the third permanent magnet (221) is W3, and the circumferential width of the fifth permanent magnet (31) is W5, wherein the rotor (100) satisfies the following relationship:

9. The rotor (100) according to claim 8, characterized in that The rotor (100) satisfies the following relationship:

10. A motor, characterized in that: Comprising a rotor (100) according to any one of claims 1-9.

11. A vehicle, characterized in that: Comprising an electric machine according to claim 10.

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