Rotor, motor, and vehicle

Abstract

A motor, comprising a rotor. The motor is arranged on a power assembly and a vehicle. The rotor comprises a rotor iron core, the rotor iron core comprises a first rotor iron core and a second rotor iron core which are connected in the radial direction, and the first rotor iron core and the second rotor iron core have different structures.

Description

Rotor, motor and vehicle

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 28, 2024, with application number 2024102248240. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of motor technology, and in particular to a rotor, a motor and a vehicle. Background Art

[0003] The rotors of existing permanent magnet motors mostly adopt a laminated iron core structure, with holes opened on the rotor laminations to embed magnets. When the permanent magnet motor rotates at high speed, the rotor laminations and magnets will be subjected to very large centrifugal forces, and the rotor core will be at risk of fracture and failure. At the same time, the stacking and assembly process and tolerance of the laminated iron core structure have a great impact on the rotor strength.

[0004] Summary of the Invention

[0005] In a first aspect, an embodiment of the present application provides a rotor, comprising a rotor core, the rotor core comprising a first rotor core and a second rotor core connected radially, wherein the first rotor core and the second rotor core have different structures.

[0006] In a second aspect, an embodiment of the present application provides a motor comprising the above-mentioned rotor structure.

[0007] In a third aspect, an embodiment of the present application provides a powertrain comprising the above-mentioned motor.

[0008] In a fourth aspect, an embodiment of the present application provides a vehicle, which includes at least the above-mentioned motor.

[0009] The rotor provided in the embodiment of the present application adopts a rotor structure composed of two iron cores, which can simultaneously take into account the advantages of two iron cores with different structures, effectively improve the rotor strength under high-speed operation of the motor, and reduce the complexity of the rotor processing and assembly process.

[0010] An electric motor provided in an embodiment of the present application includes a rotor. This rotor utilizes a composite rotor structure comprising two cores, combining the advantages of two different core structures. This effectively improves rotor strength during high-speed operation and reduces the complexity of rotor processing and assembly. By incorporating this rotor into the motor, the motor can reduce eddy current losses while meeting the performance design requirements of ensuring rotor strength and improving the motor's magnetic flux and output torque.

[0011] By setting the above-mentioned motor in the powertrain, the rotor in the motor takes into account the advantages of two different structures of iron cores at the same time, so that the motor can reduce eddy current losses, while meeting the performance design requirements of ensuring rotor strength and improving motor magnetic flux and output torque, thereby optimizing the overall performance of the powertrain.

[0012] The vehicle provided in the embodiments of the present application includes at least a motor, which includes at least a rotor. By installing the motor in the vehicle, the rotor in the motor simultaneously takes advantage of the advantages of two different iron core structures, thereby reducing eddy current losses in the motor while meeting the performance design requirements of ensuring rotor strength and increasing motor magnetic flux and output torque, thereby improving vehicle power, reducing vehicle power consumption, and improving economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic diagram of the overall structure of a rotor provided in one embodiment of the present application;

[0014] FIG2 is a cross-sectional view of a rotor provided in one embodiment of the present application;

[0015] FIG3 is a schematic structural diagram of a first rotor core provided in one embodiment of the present application;

[0016] FIG4 is a schematic structural diagram of a second rotor core provided in one embodiment of the present application;

[0017] FIG5 is a schematic cross-sectional view of a rotor provided in the first embodiment of the present application;

[0018] FIG6 is a schematic cross-sectional view of a rotor provided in a second embodiment of the present application;

[0019] FIG7 is a schematic cross-sectional view of a rotor provided in a third embodiment of the present application;

[0020] FIG8 is a schematic cross-sectional view of a rotor provided in a fourth embodiment of the present application;

[0021] FIG9 is a cross-sectional view of a radial flux motor provided by an embodiment of the present application;

[0022] FIG10 is a cross-sectional view of a radial / axial composite flux motor provided in accordance with an embodiment of the present application.

[0023] Explanation of the accompanying drawings: Radial stator 1; radial stator core 11; radial stator winding 12; rotor 2; first rotor core 21; first connecting bridge 211; mortise and tenon boss 212; second rotor core 22; second connecting bridge 221; mortise and tenon groove 222; first permanent magnet 23; second permanent magnet 24; sleeve 3; rotating shaft 4; rotor baffle 5; first axial stator 6; first axial stator core 61; first axial stator winding 62; second axial stator 7; second axial stator core 71; second axial stator winding 72. DETAILED DESCRIPTION

[0024] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0025] The rotors of existing permanent magnet motors mostly adopt a laminated iron core structure. The rotor strength is highly sensitive to the stacking and assembly process and tolerances of the rotor laminations. The strength design of the laminated iron core structure needs to reserve a larger safety margin. At the same time, due to the existence of the stacking coefficient, the laminated iron core structure reduces the permanent magnet flux and output torque of the motor compared with a solid rotor core of the same volume.

[0026] Related technologies have proposed a solid iron core structure with a separated body structure. The tolerance of the separated pole pieces is difficult to control consistently, which has a great impact on the symmetry of the motor magnetic field and is prone to introduce NVH and reliability problems. In addition, the solid iron core structure with a sheath fixed to the separated body structure, due to the design of the separated body, causes the centrifugal force of the rotor to be borne entirely by the sheath. The thicker non-magnetic sheath increases the air gap magnetic resistance, and more magnets are required under the same torque, which increases the cost.

[0027] Current motor rotors struggle to simultaneously meet the performance design requirements of ensuring rotor strength while also improving the motor's permanent magnet flux and output torque. To address this, embodiments of the present application provide a new rotor and a motor having the rotor. The motor having the rotor can be used in vehicles to address the aforementioned technical issues.

[0028] The specific structure of the rotor structure and the motor having the rotor structure are described in detail below with reference to the accompanying drawings and taking different embodiments as examples.

[0029] 1-2 , an embodiment of the present application provides a rotor 2, which can be used in a motor. Specifically, the rotor 2 can at least include: a rotor core, the rotor core including a first rotor core 21 and a second rotor core 22 connected radially, wherein the first rotor core 21 and the second rotor core 22 have different structures.

[0030] In the rotor 2, by adopting a rotor structure composed of two iron cores, the advantages of two iron cores with different structures can be taken into account at the same time, the rotor strength under high-speed operation of the motor can be effectively improved, and the complexity of the rotor processing and assembly process can be reduced.

[0031] In the embodiment of the present application, the first rotor core 21 is an axially laminated core structure, and the second rotor core 22 is a solid core structure. Optionally, the first rotor core 21 is made of a magnetically conductive material such as silicon steel sheets, silicon steel sheets, amorphous / nanocrystalline alloys, or iron-cobalt materials with good magnetic properties, which can suppress eddy current losses in the rotor core. Optionally, the second rotor core 22 is made of high-strength structural steel with good magnetic properties, which not only increases the rotor core's lamination coefficient to improve the motor's magnetic flux and output torque, but also improves rotor strength at high speeds.

[0032] To reduce rotor eddy current losses, conventional motor rotors utilize only laminated rotors. Due to the axial stacking of multiple laminations, the presence of overlap and insulation gaps results in the actual effective axial core length being less than the apparent physical axial length. The effective axial core length divided by the physical axial length equals the stacking factor. Generally, the thinner the laminations and the greater their number, the smaller the stacking factor.

[0033] The composite rotor is a combination of a laminated core structure and a solid core structure. The solid core is constructed from a single piece of iron or a small number of segmented cores, resulting in a high stacking coefficient, which improves permanent magnet flux and output torque. Furthermore, since most eddy current losses occur near the air gap of the rotor core, the laminated rotor effectively suppresses them. The composite rotor leverages the high strength of the solid rotor to improve rotor strength at high speeds. The strength of the solid core structure is less sensitive to assembly process and tolerances, allowing for an increased stacking coefficient to improve the motor's flux and output torque. The laminated core structure also reduces eddy current losses.

[0034] In the embodiment of the present application, the rotor core further includes a plurality of magnetic poles, which are arranged at intervals along the circumference of the first rotor core 21 and / or the second rotor core 22. The magnetic poles of the rotor core may be arranged only on the first rotor core 21 or the second rotor core 22, or may be arranged on both the first rotor core and the second rotor core.

[0035] 3-4 and 8 , in an embodiment of the present application, a first permanent magnet slot and / or a second permanent magnet slot is provided in each magnetic pole, a first permanent magnet 23 is provided in the first permanent magnet slot, and a second permanent magnet 24 is provided in the second permanent magnet slot; wherein, the first permanent magnet slot is provided in the first rotor core 21, or the first permanent magnet slot is provided in the first rotor core 21 and the second rotor core 22; the second permanent magnet slot is provided in the second rotor core 22.

[0036] For a permanent magnet motor with p pairs of poles (a pair of poles consists of two positive and negative poles with opposite magnetization directions), there are 2p poles; each pole is provided with a first permanent magnet slot and / or a second permanent magnet slot for placing the first permanent magnet 23 and / or the second permanent magnet 24. Among them, the position, number of layers and type of the first permanent magnet 23 and / or the second permanent magnet 24 are not limited. Optionally, corresponding permanent magnets can be set only in the first rotor core 21 or the second rotor core 22. Preferably, corresponding permanent magnets are set in both the first rotor core 21 and the second rotor core 22, and the multi-layer magnetic steel rotor structure formed is conducive to increasing the salient pole ratio and reluctance torque of the motor, thereby improving the torque density of the motor, or reducing the amount of magnetic steel used under the same torque.

[0037] Specifically, the first permanent magnet 23 and the second permanent magnet 24 can be composed of a single magnetic steel, or a magnetic steel group composed of multiple magnetic steels in a certain topological structure, including a single layer, a double layer, or a multi-layer (greater than two layers). The topological structure may include various shapes such as an arc structure, a straight line structure, a V-shaped structure, a triangle structure, a U-shaped structure, a W-shaped structure, a V+U-shaped structure, and a V+W-shaped structure. Optionally, the d-axis centerlines of the first permanent magnet 23 and the second permanent magnet 24 may be relatively offset.

[0038] In an embodiment of the present application, the first permanent magnet 23 and the second permanent magnet 24 are made of different permanent magnet materials or different permanent magnet models. Optionally, the first permanent magnet 23 and the second permanent magnet 24 can be made of permanent magnet materials such as ferrite, neodymium iron boron, aluminum nickel cobalt, samarium cobalt, iron nitride, and samarium iron nitride. The permanent magnet materials and models of the first permanent magnet 23 and the second permanent magnet 24 can be selected according to actual magnetic field requirements. The first permanent magnet 23 and the second permanent magnet 24 can be made of permanent magnets of the same material and model, or permanent magnets of different materials or different models.

[0039] In an embodiment of the present application, the first rotor core 21 comprises a plurality of first segmented rotor cores arranged adjacent to each other in the axial direction, with the first permanent magnets 23 in at least two of the first segmented rotor cores staggered circumferentially at a predetermined angle to form first rotor skew poles. Alternatively, the second rotor core 22 comprises a plurality of segmented rotor cores arranged adjacent to each other in the axial direction, with the second permanent magnets 24 in at least two of the segmented rotor cores staggered circumferentially at a predetermined angle to form second rotor skew poles. The laminated first rotor core 21 can have either a straight pole structure or a segmented skew pole structure. The laminated first rotor core 21 is installed in axial segments, minimizing magnetic flux leakage from the ends of the first permanent magnets 23 while ensuring the motor's output torque. This improves the utilization rate of the first permanent magnets 23, reduces cogging torque, reduces motor torque ripple, effectively improves the sinusoidality of the air gap magnetic field, reduces harmonics, and alleviates motor vibration and noise issues, thereby increasing motor efficiency. Optionally, the laminated first rotor core 21 can be divided into 2-8 segments. The solid second rotor core 22 is assembled in a small number of sections along the axial direction, which is convenient for processing and helps to suppress eddy current losses in the second rotor core. There is no limit on the number of sections of the solid second rotor core 22, as long as the axial height of each solid second rotor core section is greater than the thickness of the laminated first rotor core 21. Optionally, the solid second rotor core 22 can be divided into 2-6 sections. The solid second rotor core 22 can be a straight pole structure or a segmented skew pole structure. By adopting a rotor segmented skew pole structure in the laminated first rotor core 21 and / or the solid second rotor core 22, the cogging torque and torque pulsation of the motor can be further improved, and the vibration and noise of the motor can be reduced.

[0040] In the embodiment of the present application, the second rotor core 22 includes a plurality of segmented rotor cores arranged adjacent to each other along the axial direction. The solid second rotor core 22 is assembled into a small number of segments along the axial direction, which facilitates processing and helps to suppress eddy current losses in the second rotor core.

[0041] In the embodiment of the present application, a weight-reducing hole is provided in the second rotor core 22. Providing the weight-reducing hole in the second rotor core 22 can ensure the strength of the composite permanent magnet rotor while reducing the weight of the composite permanent magnet rotor and saving raw material costs.

[0042] In the embodiment of the present application, both the first rotor core 21 and the second rotor core 22 are cylindrical in structure, which facilitates processing and assembly.

[0043] In the embodiment of the present application, auxiliary slots are provided on the circumferential surface of the first rotor core 21 away from the second rotor core 22, or auxiliary slots are provided on the circumferential surface of the second rotor core 22 away from the first rotor core 21. By providing symmetrical or asymmetrical auxiliary slots on the rotor core surface near the air gap side of the stator, the harmonics and losses of the motor can be reduced, effectively suppressing the torque ripple and electromagnetic vibration noise of the permanent magnet motor, and improving the NVH problem of the motor.

[0044] In the embodiment of the present application, the first rotor core 21 and the second rotor core 22 have the same axial height. This allows for the first and second rotor cores 21, 22 to have the same axial height, combining the advantages of two different core structures while facilitating installation and fixation. Alternatively, the first and second rotor cores 21, 22 may have different axial heights, depending on actual magnetic field requirements.

[0045] As shown in FIG8 , in the embodiment of the present application, a jacket 3 is provided on a side of the first rotor core 21 away from the second rotor core 22, and / or a jacket 3 is provided on a side of the second rotor core 22 away from the first rotor core 21. By adding the jacket 3 on the radially inner side and / or radially outer side of the composite permanent magnet rotor, the rotor strength can be further increased.

[0046] In the embodiment of the present application, the material of the sheath 3 can be alloy steel, aluminum alloy, stainless steel or fiber material. Optionally, the fiber material includes ceramic, glass fiber, polypropylene, polyethylene, polyetheretherketone (PEEK) and similar plastics.

[0047] In an embodiment of the present application, the first rotor core 21 and the second rotor core 22 are fixedly connected to each other using at least one of the following fixing methods: riveting, threading, snap-fitting, and bonding. The first rotor core 21 and the second rotor core 22 can be connected by riveting, threading, snap-fitting, or bonding to achieve a transition fit or interference fit between the first rotor core 21 and the second rotor core 22. Optionally, the first rotor core 21 and the second rotor core 22 are connected using a mortise and tenon structure, pins, or bolts. Optionally, the first rotor core 21 and the second rotor core 22 are provided with keyways, connection holes, or threaded holes for assembly.

[0048] In the embodiment of the present application, a connecting protrusion is provided on one of the first and second rotor cores 21, 22, and a connecting recess is provided on the other of the first and second rotor cores 21, 22. The connecting protrusion and the connecting recess cooperate with each other to securely connect the first and second rotor cores 21, 22. The cooperation between the connecting protrusion and the connecting recess ensures a secure connection between the first and second rotor cores 21, 22.

[0049] As shown in Figure 5, in this embodiment of the present application, the first rotor core 21 is connected as a whole by a first connecting bridge 211, and the second rotor core 22 is connected as a whole by a second connecting bridge 221. The first connecting bridge 211 and the second connecting bridge 221 can be a flexible combination of multiple magnetic bridges. Optionally, the first connecting bridge 211 is arranged between the first permanent magnet slot and the outer edge of the first rotor core 21 and between the first permanent magnet slots; the second connecting bridge 221 is arranged between the second permanent magnet slot and the second rotor core 22 and between the second permanent magnet slots.

[0050] The provision of first connecting bridge 211 and second connecting bridge 221 respectively connects first rotor core 21 and second rotor core 22 into a single unit, thereby improving the mechanical strength of the composite rotor. Furthermore, because both the solid core structure and the laminated rotor structure form a circumferentially integrated structure, the composite rotor is more reliable and easier to assemble than fully laminated core structures or split-body solid core structures.

[0051] Referring to Figure 6, Figure 6 is a cross-sectional schematic diagram of the rotor provided in the second embodiment of the present application. Unlike the first embodiment, in the second embodiment, the first connecting bridge 211 is arranged between the first permanent magnet slot and the outer edge of the first rotor core 21, between the first permanent magnet slot and the inner edge of the first rotor core 21, and between the first permanent magnet slots.

[0052] Referring to Figure 7, Figure 7 is a cross-sectional schematic diagram of the rotor provided in the third embodiment of the present application. Unlike the first embodiment, in the third embodiment, the first rotor core 21 and the second rotor core 22 are matched through a mortise and tenon structure, and a mortise and tenon boss 212 is provided on the mating surface of the first rotor core 21, and a mortise and tenon groove 222 is provided on the mating surface of the second rotor core 22.

[0053] Referring to FIG8 , FIG8 is a schematic cross-sectional view of a rotor provided in a fourth embodiment of the present application. Unlike the first embodiment, in the fourth embodiment, first permanent magnet slots are provided in the first rotor core 21 and the second rotor core 22, and second permanent magnet slots are provided in the second rotor core 22. Furthermore, a sheath 3 is provided on the circumferential outer side of the first rotor core 21.

[0054] Based on the above embodiment, the present invention further provides a motor including at least one rotor 2. Specifically, the rotor 2 further includes a rotating shaft 4 and a rotor baffle 5, which is disposed at both axial ends of the rotor core.

[0055] The motor provided in an embodiment of the present application includes a rotor 2. By utilizing a rotor structure composed of two iron cores, this rotor 2 simultaneously leverages the advantages of two different iron core structures, effectively improving the rotor strength of the permanent magnet motor during high-speed operation and reducing the complexity of rotor processing and assembly. By incorporating this rotor 2 into the motor, the motor can reduce eddy current losses while meeting the performance design requirements of ensuring rotor strength and improving the motor's magnetic flux and output torque.

[0056] Specifically, the rotor structure using two composite iron cores can be applied not only to radial flux motors, but also to radial / axial composite flux motors.

[0057] In the embodiment of the present application, the motor 1 further includes at least one radial stator 1, wherein the radial stator 1 and the rotor 2 are alternately arranged along the radial direction of the permanent magnet motor. The stator 1 includes a radial stator core 11 and a radial stator winding 12.

[0058] In the embodiment of the present application, the first rotor core 21, located near the radial stator 1, is a laminated core structure stacked axially, while the second rotor core 22, located farther from the radial stator 1, is a solid core structure. Most eddy current losses occur near the air gap near the radial stator 1. The laminated structure of the first rotor core 21, located near the radial stator 1, effectively suppresses eddy current losses.

[0059] Specifically, the radial flux motor can be an inner rotor motor or an outer rotor motor. The radial positions of the first rotor core 21 and the second rotor core 22 are not limited. Preferably, the first rotor core 21 of the laminated core structure is positioned close to the air gap between the rotor 2 and the radial stator 1. The laminated core structure close to the air gap can reduce the eddy current loss of the rotor 2. Alternatively, for an inner rotor permanent magnet motor, as shown in FIG9 , the first rotor core 21 is positioned close to the air gap between the radial stator 1 and the rotor 2, and the second rotor core 22 is positioned close to the shaft.

[0060] In an embodiment of the present application, the motor further includes at least one axial stator, wherein the axial stator is disposed on at least one axial side of the rotor 2. The composite rotor in the radial / axial composite flux motor can provide not only a radial magnetic flux path, but also a low-magnetic-resistance axial magnetic flux path, thereby improving the energy conversion efficiency of the motor, thereby improving the motor torque and power density. Optionally, as shown in FIG10 , the axial stator includes a first axial stator 6 and a second axial stator 7, wherein the first axial stator 6 includes a first axial stator core 61 and a first axial stator winding 62, and the second axial stator 7 includes a second axial stator core 71 and a second axial stator winding 72.

[0061] An embodiment of the present application also provides a powertrain, which may include at least the above-mentioned motor.

[0062] By setting the above-mentioned motor in the powertrain, the rotor 2 in the motor takes into account the advantages of two different structures of iron cores at the same time, so that the motor can reduce eddy current losses, while meeting the performance design requirements of ensuring rotor strength and improving motor magnetic flux and output torque, thereby optimizing the overall performance of the powertrain.

[0063] In addition, an embodiment of the present application also provides a vehicle, which may at least include the above-mentioned motor.

[0064] It is understandable that the motor is used to provide power for the vehicle. The motor rotor in this application takes into account the advantages of two different core structures, thereby enabling the motor to reduce eddy current losses while meeting the performance design requirements of ensuring rotor strength and improving motor magnetic flux and output torque, thereby improving the power of the entire vehicle, reducing vehicle power consumption and improving economy. The vehicle may include a pure electric or hybrid vehicle, etc. In other embodiments, the vehicle may include an electric vehicle or a special operation vehicle. The electric vehicle may include a two-wheeled, three-wheeled or four-wheeled electric vehicle. The special operation vehicle may include various vehicles with specific functions, such as an engineering rescue vehicle, a sprinkler truck, a sewage suction truck, a cement mixer truck, a crane truck or a medical vehicle.

[0065] In the description of the embodiments of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0066] In the embodiments of the present application, any device or element referred to or implied must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise specifically specified.

[0067] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described here. In addition, the terms "may include" and "have" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0068] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them. Although the embodiments of this application have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the various embodiments of this application.

Claims

1. A rotor (2), comprising a rotor core, wherein the rotor core comprises a first rotor core (21) and a second rotor core (22) connected radially, wherein: The first rotor core (21) and the second rotor core (22) have different structures.

2. The rotor (2) according to claim 1, wherein The first rotor core (21) is a laminated core structure stacked in the axial direction, and the second rotor core (22) is a solid core structure.

3. The rotor (2) according to claim 2, wherein: The rotor core further comprises a plurality of magnetic poles, which are arranged at intervals along the circumference of the first rotor core (21) and / or the second rotor core (22).

4. The rotor (2) according to claim 3, wherein: A first permanent magnet slot and / or a second permanent magnet slot is provided in each of the magnetic poles, a first permanent magnet (23) is provided in the first permanent magnet slot, and a second permanent magnet (24) is provided in the second permanent magnet slot; The first permanent magnet slot is provided in the first rotor core (21), or the first permanent magnet slot is provided in the first rotor core (21) and the second rotor core (22); and the second permanent magnet slot is provided in the second rotor core (22).

5. The rotor (2) according to claim 4, wherein The first permanent magnet (23) and the second permanent magnet (24) are made of different permanent magnet materials or different permanent magnet models.

6. The rotor (2) according to claim 4, wherein: The first rotor core (21) comprises a plurality of first segmented rotor cores adjacently arranged in the axial direction, and the first permanent magnets (23) in at least two of the first segmented rotor cores are staggered at a certain angle in the circumferential direction to form a first rotor skew pole; And / or, the second rotor core (22) comprises a plurality of segmented rotor cores arranged adjacent to each other in the axial direction, and the second permanent magnets (24) in at least two of the segmented rotor cores are staggered at a certain angle in the circumferential direction to form a second rotor skew pole.

7. The rotor (2) according to claim 2, wherein: The second rotor core (22) includes a plurality of segmented rotor cores adjacently arranged along the axial direction.

8. The rotor (2) according to claim 2, wherein: A weight-reducing hole is provided in the second rotor core (22).

9. The rotor (2) according to any one of claims 1 to 8, wherein: The first rotor core (21) and the second rotor core (22) both have a cylindrical structure.

10. The rotor (2) according to any one of claims 1 to 8, wherein: Auxiliary grooves are provided on the circumferential surface of the first rotor core (21) away from the second rotor core (22), or auxiliary grooves are provided on the circumferential surface of the second rotor core (22) away from the first rotor core (21).

11. The rotor (2) according to any one of claims 1 to 8, wherein: The first rotor core (21) and the second rotor core (22) have the same axial height.

12. The rotor (2) according to any one of claims 1 to 8, wherein: A sheath (3) is provided on a side of the first rotor core (21) away from the second rotor core (22), and / or a sheath (3) is provided on a side of the second rotor core (22) away from the first rotor core (21).

13. The rotor (2) according to claim 12, wherein: The material of the sheath (3) can be alloy steel, aluminum alloy, stainless steel or fiber material.

14. The rotor (2) according to any one of claims 1 to 8, wherein: The first rotor core (21) and the second rotor core (22) are fixedly connected to each other, and the fixing method includes at least one of the following: riveting, threaded connection, snap connection and bonding.

15. The rotor (2) according to any one of claims 1 to 8, wherein: A connecting protrusion is provided on one of the first rotor core (21) and the second rotor core (22), and a connecting recess is provided on the other of the first rotor core (21) and the second rotor core (22). The connecting protrusion and the connecting recess cooperate with each other to securely connect the first rotor core (21) and the second rotor core (22).

16. An electric machine comprising at least one rotor (2) according to any one of claims 1 to 15.

17. The electric machine according to claim 16, further comprising at least one radial stator (1), wherein The radial stators (1) and the rotors (2) are alternately arranged along the radial direction of the motor.

18. The electric machine according to claim 17, wherein The first rotor core (21) close to the radial stator (1) is a laminated core structure stacked in the axial direction, and the second rotor core (22) far from the radial stator (1) is a solid core structure.

19. The electric machine according to claim 17 or 18, further comprising at least one axial stator, wherein The axial stator is arranged on at least one axial side of the rotor (2).

20. A vehicle comprising the motor according to any one of claims 16 to 19.

21. The vehicle of claim 20, further comprising: A power assembly, wherein the motor is arranged in the power assembly.

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