Rotor assembly, motor and vehicle

Abstract

The utility model discloses a rotor assembly, a motor and a vehicle, the rotor assembly is provided with an oil inlet and comprises a rotor iron core and a magnet vane, the rotor iron core comprises a plurality of iron core single bodies, the plurality of iron core single bodies are sequentially arranged in a first direction, the first direction is the axial direction of the rotor assembly, the magnet vane is arranged between two adjacent iron core single bodies, and the magnet vane is arranged between the two adjacent iron core single bodies. A first flow channel and a first communication port communicated with the first flow channel are formed in the iron core single body, the first communication port is arranged towards the magnetism isolating plate, a second flow channel and a second communication port communicated with the second flow channel are formed in the magnetism isolating plate, the first communication port and the second communication port are opposite and communicated in the first direction, and the second flow channel is communicated with the oil inlet; and the protective sleeve sleeves the outer side of the rotor iron core, and the protective sleeve is fixedly connected with the magnet vane and the rotor iron core. According to the rotor assembly provided by the utility model, the protective sleeve can prevent the relative offset of the iron core monomers and the magnet vane in the radial direction, so that a cooling flow channel in the rotor iron core is smooth.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially is rotor assembly, motor and vehicle. BACKGROUND

[0002] The rotor of the motor generates a large amount of heat in the working process, on some rotors, cooling flow channels are arranged in the interior of the rotor core, simultaneously, in order to guarantee the magnetic conductivity of the rotor core and reduce the structural damage to the rotor core, the rotor core is usually divided into multiple single bodies, the magnetic separation plate is arranged between the core single bodies, and part of the cooling flow channels are formed on the magnetic separation plate, in the process of high-speed rotation of the rotor, the magnetic separation plate and the core single body can generate relative deviation in the radial direction, the cooling flow channel on the magnetic separation plate deviates from the cooling flow channel on the core single body, the cooling oil passage in the rotor core is not smooth, and the reliability of the motor is affected. SUMMARY

[0003] The utility model aims at solving one of the technical problems in the prior art at least.

[0004] The utility model further provides a motor with the rotor assembly.

[0005] The utility model further provides a vehicle with the motor.

[0006] According to the rotor assembly of the utility model first aspect, the rotor assembly has the oil inlet and includes: the rotor core and the magnetic separation plate, the rotor core includes multiple core single bodies, multiple core single bodies are sequentially arranged in the first direction, the first direction is the axial direction of the rotor assembly, the magnetic separation plate is arranged between two adjacent core single bodies, the core single body is formed with the first flow channel and the first communication port communicated with the first flow channel, the first communication port is arranged towards the magnetic separation plate, the magnetic separation plate is formed with the second flow channel and the second communication port communicated with the second flow channel, the first communication port and the second communication port are opposite and communicated in the first direction, and the second flow channel is communicated with the oil inlet;The protective sleeve is sleeved on the outside of the rotor core, and the protective sleeve is fixedly connected with the magnetic separation plate and the rotor core.

[0007] According to the rotor assembly of the utility model first aspect, by setting the protective sleeve, on the one hand, the protective sleeve can prevent the relative deviation of the magnetic separation plate and the core single body in the radial direction, so that the cooling flow channel in the rotor core is usually improved, the reliability of the motor in the working process is improved, on the other hand, the protective sleeve can prevent the magnetic separation plate and the core single body from being separated in the axial direction, so that the structural strength of the rotor assembly is improved, and the reliability of the motor is further improved.

[0008] According to some embodiments of the present application, the elastic modulus of the magnetic isolation plate and the iron core monomer is different.

[0009] According to some embodiments of the present application, the iron core monomer is an amorphous material piece.

[0010] According to some embodiments of the present application, the magnetic isolation plate is an aluminum alloy material piece.

[0011] According to some embodiments of the present application, the protective sleeve is a carbon fiber material piece.

[0012] According to some embodiments of the present application, the second flow channel is open at least one side in the first direction, and the iron core monomer arranged at the open side of the second flow channel covers the open side of the second flow channel.

[0013] According to some embodiments of the present application, the second flow channel extends along the radial direction of the rotor assembly, and the number of the second flow channels is multiple, and the multiple second flow channels are arranged in the circumferential direction of the rotor assembly.

[0014] According to some embodiments of the present application, a communication hole penetrating through the magnetic isolation plate along the first direction is further formed on the magnetic isolation plate, the communication hole is communicated with the second flow channel, and both ends of the communication hole in the first direction are formed as the second communication port.

[0015] According to some embodiments of the present application, one second flow channel is communicated with one or more communication holes.

[0016] According to some embodiments of the present application, the iron core monomer comprises an iron core body and a permanent magnet, a plurality of permanent magnet grooves penetrating through the iron core body along the first direction are formed on the iron core body, the permanent magnet is arranged in the permanent magnet groove, the first flow channel is defined by the cooperation between the permanent magnet and the inner wall of the permanent magnet groove, the number of the communication holes is multiple, and the multiple communication holes correspond to and communicate with the multiple permanent magnet grooves.

[0017] According to some embodiments of the present application, the rotor assembly further comprises a rotating shaft, the rotor iron core and the magnetic isolation plate are sleeved on the rotating shaft, a third flow channel extending along the axial direction of the rotor iron core is formed in the rotating shaft, and the third flow channel is communicated between the oil inlet and the second flow channel.

[0018] According to some embodiments of the present application, the rotor assembly further comprises an end plate, the end plate is arranged at both ends of the rotor iron core in the axial direction, the protective sleeve is located between the two end plates in the axial direction of the rotor iron core, and the end faces of the two ends of the protective sleeve are respectively attached to the two end plates.

[0019] According to some embodiments of the present application, the thickness of the end plate is greater than the thickness of the magnetic isolation plate.

[0020] According to some embodiments of the present application, a fourth flow channel is formed on the end plate, and the fourth flow channel is in communication between the first flow channel and an oil outlet of the rotor assembly.

[0021] According to some embodiments of the present application, the fourth flow channel is recessed from a side surface of the end plate facing the rotor core, and the fourth flow channel penetrates the outer peripheral surface of the end plate in the radial direction of the core monomer to form the oil outlet.

[0022] According to some embodiments of the present application, the core monomer is two, the first flow channel penetrates the core monomer in the axial direction of the core monomer, and the first flow channel is in communication with the second flow channel and the fourth flow channel at both ends, respectively.

[0023] According to the motor of the second aspect of the present application, the rotor assembly according to the first aspect of the present application is provided, and the reliability in the working process can be improved.

[0024] According to the motor of the second aspect of the present application, the rotor assembly according to the first aspect of the present application is provided, and the reliability in the working process can be improved.

[0025] According to the vehicle of the third aspect of the present application, the motor according to the second aspect of the present application is provided, and the reliability in the working process can be improved.

[0026] According to the vehicle of the third aspect of the present application, the motor according to the second aspect of the present application is provided, and the reliability in the working process can be improved.

[0027] Additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is an exploded view of the rotor assembly according to the embodiments of the present application;

[0029] Figure 2 is a sectional view of the rotor assembly according to the embodiments of the present application;

[0030] Figure 3 is Figure 1 a schematic view of the magnetic isolation plate shown in FIG.

[0031] Figure 4 is Figure 1 a schematic view of the end plate shown in FIG.

[0032] REFERENCE NUMERALS:

[0033] 100. A rotor assembly;

[0034] 10. A rotor core; 11. A core unit; 111. A first flow channel;

[0035] 20. A magnetic isolation plate; 21. A second flow channel; 22. A communication hole;

[0036] 30. A protective sleeve;

[0037] 40. A rotating shaft; 41. A third flow channel;

[0038] 50. An end plate; 51. A fourth flow channel;

[0039] 60. A permanent magnet;

[0040] 70. An oil inlet;

[0041] 80. An oil outlet. DETAILED DESCRIPTION

[0042] Embodiments of the present application will be described in detail below with reference to the drawings, in which like reference numerals refer to like elements or elements having the same or similar function throughout the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0043] Reference will be made to the drawings Figures 1-4 A rotor assembly 100 according to the first aspect of the present application is described below.

[0044] As shown in Figure 1 and Figure 2 A rotor assembly 100 according to the first aspect of the present application has an oil inlet 70 and comprises a rotor core 10, a magnetic isolation plate 20 and a protective sleeve 30.

[0045] Specifically, the rotor core 10 comprises a plurality of core units 11, for example, two, three or four core units 11, which are arranged in sequence in a first direction, the first direction being the axial direction of the rotor assembly 100. The magnetic isolation plate 20 is arranged between two adjacent core units 11. The core unit 11 is formed with a first flow channel 111 and a first communication hole communicating with the first flow channel 111, the first communication hole being arranged towards the magnetic isolation plate 20. The magnetic isolation plate 20 is formed with a second flow channel 21 and a second communication hole communicating with the second flow channel 21. The first communication hole and the second communication hole are opposite and communicate in the first direction. The second flow channel 21 communicates with the oil inlet 70. The protective sleeve 30 is arranged outside the rotor core 10, and the protective sleeve 30 is fixedly connected with the magnetic isolation plate 20 and the rotor core 10.

[0046] During the operation of the motor, the cooling liquid enters the second flow channel 21 from the oil inlet 70, and enters the first flow channel 111 from the first communication port through the second communication port.

[0047] It can be understood that, during the operation of the motor, the rotating speed of the rotor assembly 100 is relatively fast, and the rotor assembly 100 is subjected to a relatively large force in the radial direction. Under the action of the radial force, on the one hand, the relative movement between the magnetic separation plate 20 and the core monomer 11 can occur, so that the first communication port and the second communication port are offset in the radial direction, and on the other hand, when the material of the magnetic separation plate 20 and the core monomer 11 is different, the elastic modulus of the magnetic separation plate 20 and the core monomer 11 is also different, and under the action of the radial force, the deformation amount of the magnetic separation plate 20 and the core monomer 11 in the radial direction is also different, so that the magnetic separation plate 20 and the core monomer 11 relatively move in the radial direction, the first communication port and the second communication port are offset in the radial direction, and thus the cooling flow channel of the rotor core 10 is not smooth, the cooling efficiency of the cooling medium on the rotor core 10 is low, and the reliability during the operation of the motor is affected.

[0048] In the embodiment, the protective sleeve 30 is sleeved outside the rotor core 10, and the protective sleeve 30 is fixedly connected with the rotor core 10 and the magnetic separation plate 20, so that when the magnetic separation plate 20 and the rotor core 10 relatively move in the radial direction, the protective sleeve 30 can abut against the magnetic separation plate 20 and the core monomer 11 on the outside, thereby preventing the relative movement of the magnetic separation plate 20, and further preventing the offset of the first communication port and the second communication port in the radial direction, so that the cooling flow channel is smooth.

[0049] Meanwhile, the protective sleeve 30 is fixedly connected with the rotor core 10 and the magnetic separation plate 20, so that the connection relationship between the core monomer 11 and the magnetic separation plate 20 is increased, and the protective sleeve 30 can prevent the separation of the core monomer 11 and the magnetic separation plate 20 during the operation of the rotor assembly 100, thereby improving the structural strength of the rotor assembly 100.

[0050] According to the rotor assembly 100 of the first aspect of the utility model, by arranging the protective sleeve 30, on the one hand, the protective sleeve 30 can prevent the relative offset of the magnetic separation plate 20 and the core monomer 11 in the radial direction, so that the cooling flow channel in the rotor core 10 is smooth, and the reliability during the operation of the motor is improved, and on the other hand, the protective sleeve 30 can prevent the separation of the core monomer 11 and the magnetic separation plate 20 in the axial direction, thereby improving the structural strength of the rotor assembly 100, and further improving the reliability of the motor.

[0051] In some embodiments of the utility model, the elastic modulus of the magnetic isolation plate 20 and the iron core monomer 11 is different. After the rotor assembly 100 is assembled, the permanent magnet 60 is arranged in the iron core monomer 11, and the material of the iron core monomer 11 needs to have good magnetic conductivity, at the same time, in order to reduce the magnetic field interference between different iron core monomers 11, the magnetic isolation plate 20 needs to use the material with low magnetic conductivity, so that the rotor assembly 100 can work more stably and efficiently. Among them, the material of the magnetic isolation plate 20 and the iron core monomer 11 is different, and the elastic modulus is also different, in the process of product design, the material of the magnetic isolation plate 20 and the iron core monomer 11 can be selected according to the design requirement, so as to meet more product design requirements.

[0052] Among them, the iron core monomer 11 can be a silicon steel material piece, and the iron core monomer 11 can also be an amorphous material piece.

[0053] In some embodiments of the utility model, the iron core monomer 11 is an amorphous material piece. The amorphous material piece has high magnetic conductivity, and the eddy current loss and hysteresis loss are low, which can improve the efficiency of the motor.

[0054] In some embodiments of the utility model, the magnetic isolation plate 20 is an aluminum alloy material piece. The magnetic isolation plate 20 has high magnetic isolation performance, which can improve the uniformity of the magnetic field distribution on the rotor assembly 100, thereby further improving the efficiency of the motor.

[0055] In some embodiments of the utility model, the protective sleeve 30 is a carbon fiber material piece. The carbon fiber material piece has high strength and stable chemical properties, which can further improve the structural strength of the rotor assembly 100 and improve the service life of the rotor assembly 100.

[0056] In some embodiments of the utility model, as shown in Figure 1 and Figure 3 As shown in the figure, at least one side of the second flow channel 21 is open in the first direction, and the iron core monomer 11 arranged on the open side of the second flow channel 21 covers the open side of the second flow channel 21. That is, the second flow channel 21 can be open on one side in the first direction, or the second flow channel 21 can be open on both sides in the first direction, so that the iron core monomer 11 covers the open side of the second flow channel 21, and the iron core monomer 11 and the magnetic isolation plate 20 cooperate to define the second flow channel 21.

[0057] Among them, at least one side of the second flow channel 21 is open, which can reduce the production difficulty of the magnetic isolation plate 20, thereby reducing the production difficulty of the rotor assembly 100.

[0058] Preferably, the second flow channel 21 is open on both sides in the first direction, which can further reduce the production difficulty of the magnetic isolation plate 20, and under the premise that the flow area of the second flow channel 21 meets the use requirement, the thickness of the magnetic isolation plate 20 can be reduced.

[0059] In some embodiments of the utility model, as shown in Figure 1 And Figure 3 As shown, the second flow channel 21 extends along the radial direction of the rotor assembly 100, and the number of the second flow channel 21 is multiple, for example, the second flow channel 21 can be two, three, six, seven or nine, and the multiple second flow channels 21 are arranged at intervals in the circumferential direction of the rotor assembly 100.

[0060] Therefore, the cooling medium can cool the rotor assembly 100 at multiple positions during the flow in each second flow channel 21, so that the cooling efficiency and uniformity of the rotor assembly 100 can be improved.

[0061] In some embodiments of the utility model, as shown in Figure 1 And Figure 3 As shown, the magnetic separation plate 20 further forms a communication hole 22 penetrating the magnetic separation plate 20 in the first direction, the communication hole 22 is communicated with the second flow channel 21, and both ends of the communication hole 22 in the first direction are formed into a second communication port. During the operation of the motor, the cooling medium flows from the second flow channel 21 to the communication hole 22, and then flows into the first communication port on the core monomer 11 on both sides of the magnetic separation plate 20 through both ends of the communication hole 22 respectively, so that the structure of the magnetic separation plate 20 is relatively simple, and the production difficulty of the magnetic separation plate 20 can be further reduced.

[0062] In some embodiments of the utility model, as shown in Figure 1 And Figure 3 As shown, one second flow channel 21 is communicated with one or more communication holes 22. For example, one second flow channel 21 can be communicated with one, two or three communication holes 22, and during the product design process, the number of communication holes 22 can be adjusted according to the cooling area distribution of the rotor assembly 100 and the flow distribution needs of the cooling medium, so as to meet more product design needs.

[0063] In some embodiments of the utility model, as shown in Figures 1-3 As shown, the core monomer 11 includes a core body and a permanent magnet 60, the core body forms a plurality of permanent magnet grooves penetrating the core body in the first direction, the permanent magnet 60 is arranged in the permanent magnet groove, the first flow channel 111 is defined between the permanent magnet 60 and the inner wall of the permanent magnet groove, and the number of the communication hole 22 is multiple, and the multiple communication holes 22 correspond to and communicate with the multiple permanent magnet grooves.

[0064] It can be understood by those skilled in the art that the permanent magnet 60 can lose magnetism when the temperature of the permanent magnet 60 is high. In the embodiment, during the operation of the motor, the cooling medium enters the first flow channel 111 in the permanent magnet slot from the communication hole 22 through the first communication port, so that the cooling medium can be in contact with the permanent magnet 60, the permanent magnet 60 is cooled, and thus the cooling efficiency of the permanent magnet 60 can be improved, and the reliability of the motor during operation is further improved.

[0065] The first flow channel 111 is defined by the permanent magnet 60 and the permanent magnet slot, so that the structure of the core monomer 11 can be simplified, and thus the production difficulty of the core monomer 11 is reduced.

[0066] Preferably, the first flow channel 111 is formed between the permanent magnet 60 and the two side inner walls of the core monomer 11 in the radial direction, so that the cooling medium can cool the permanent magnet 60 on both sides of the permanent magnet 60, and the cooling efficiency of the permanent magnet 60 is further improved.

[0067] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 The rotor assembly 100 further comprises a rotating shaft 40, and the rotor core 10 and the magnetic separation plate 20 are sleeved on the rotating shaft 40. The third flow channel 41 extending along the axial direction of the rotor core 10 is formed in the rotating shaft 40, and the third flow channel 41 is communicated between the oil inlet 70 and the second flow channel 21.

[0068] During the operation of the motor, the cooling medium enters the third flow channel 41 from the oil inlet 70, then enters the second flow channel 21 from the third flow channel 41, and then enters the first flow channel 111 from the second communication port and the first communication port. The third flow channel 41 is communicated with the plurality of second flow channels 21 arranged at intervals in the circumferential direction of the rotor assembly 100, so that the cooling flow channel can be normally arranged in the rotor assembly 100. The rotor core 10 and the magnetic separation plate 20 are sleeved on the rotating shaft 40, and the rotating shaft 40 can fix the rotor core 10 and the magnetic separation plate 20, so as to further improve the structural strength of the rotor assembly 100.

[0069] The outer peripheral wall of the rotating shaft 40 is provided with a limiting groove, and the inner side of the rotor core 10 and the magnetic separation plate 20 is provided with a limiting protrusion, and the limiting protrusion is limitedly matched in the limiting groove.

[0070] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 The rotor assembly 100 further comprises an end plate 50, and the end plate 50 is arranged at both ends of the rotor core 10 in the axial direction. In the axial direction of the rotor core 10, the protective sleeve 30 is located between the two end plates 50, and the two end faces of the protective sleeve 30 are respectively attached to the two end plates 50.

[0071] By setting the end plate 50, on the one hand, during rotation of the rotor assembly 100, when the protective sleeve 30 is axially displaced relative to the rotor core 10, the end plate 50 can abut against the protective sleeve 30, thereby preventing the protective sleeve 30 from being axially displaced relative to the rotor core 10, further improving the reliability during operation of the motor, on the other hand, it can be understood that the adjustment of the structure of the end plate 50 has a lower impact on the magnetic circuit distribution, during product development, the dynamic balance of the rotor assembly 100 can be adjusted by adjusting the structural distribution on the end plate 50, thereby reducing the difficulty of product development.

[0072] In some embodiments of the utility model, the thickness of the end plate 50 is greater than the thickness of the magnetic separation plate 20. Therefore, during rotation of the rotor assembly 100, the end plate 50 is not easy to deform, thereby improving the stability of the rotor assembly 100 during operation.

[0073] Preferably, the thickness of the end plate 50 is 5mm-10mm, for example, the thickness of the end plate 50 can be 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, and the thickness of the magnetic separation plate 20 is 3mm, 4mm, 5mm or 6mm.

[0074] In some embodiments of the utility model, as shown in Figure 1 , Figure 2 and Figure 4 , the fourth flow channel 51 is formed on the end plate 50, and the fourth flow channel 51 is communicated between the first flow channel 111 and the oil outlet 80 of the rotor assembly 100.

[0075] During operation of the motor, the cooling medium enters the third flow channel 41 on the shaft 40 from the oil inlet 70, then enters the second flow channel 21 from the third flow channel 41, enters the first flow channel 111 through the second communication port and the first communication port, then flows from the first flow channel 111 to the fourth flow channel 51 at the end, and flows out of the rotor assembly 100 from the fourth flow channel 51, thereby achieving cooling of the rotor assembly 100.

[0076] Among them, by forming the fourth flow channel 51 on the end plate 50, the structure of the rotor assembly 100 can be simplified, thereby reducing the production difficulty and design difficulty.

[0077] In some embodiments of the utility model, as shown in Figure 1 and Figure 4 , the fourth flow channel 51 is recessed from the side surface of the end plate 50 facing the rotor core 10, and the fourth flow channel 51 penetrates the outer peripheral surface of the end plate 50 in the radial direction of the core monomer 11 to form the oil outlet 80. Therefore, the structure of the rotor assembly 100 can be further simplified, thereby further reducing the production difficulty of the rotor assembly 100.

[0078] The fourth flow channel 51 penetrates the outer circumferential surface of the end plate 50 in the radial direction of the core monomer 11, and in the radial direction, the size of the fourth flow channel 51 can be increased, thereby increasing the flow range of the cooling medium in the rotor assembly 100, and further improving the cooling efficiency and uniformity of cooling.

[0079] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 The core monomer 11 is two, the first flow channel 111 penetrates the core monomer 11 along the axial direction of the core monomer 11, and the two ends of the first flow channel 111 are communicated with the second flow channel 21 and the fourth flow channel 51 respectively.

[0080] In the working process of the motor, the cooling medium enters the third flow channel 41 in the rotating shaft 40 from the oil inlet 70, then enters the second flow channel 21 from the third flow channel 41, and then enters the corresponding first flow channel 111 from the two first communication ports on the two core monomers 11 on both sides of the magnetic separation plate 20 through the two second communication ports on both sides of the magnetic separation plate 20, and then flows out of the rotor assembly 100 from the fourth flow channel 51 at both ends in the opposite direction in the first flow channel 111 in the two core monomers 11, thereby realizing the cooling of the rotor assembly 100.

[0081] According to the motor of the second aspect of the utility model, the rotor assembly 100 according to the first aspect of the utility model is arranged, and the reliability in the working process can be improved.

[0082] According to the motor of the second aspect of the utility model, the rotor assembly 100 according to the first aspect of the utility model is arranged, and the reliability in the working process can be improved.

[0083] According to the vehicle of the third aspect of the utility model, the motor according to the second aspect of the utility model is arranged, and the reliability in the working process can be improved.

[0084] According to the vehicle of the third aspect of the utility model, the motor according to the second aspect of the utility model is arranged, and the reliability in the working process can be improved.

[0085] In the description of the utility model, it is necessary to understand that the orientation or positional relation indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is the orientation or positional relation based on the orientation or positional relation shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0086] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified and limited.

[0087] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0088] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" 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 utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0089] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A rotor assembly characterized by, The rotor assembly has an oil inlet and comprises: a rotor core comprising a plurality of core units arranged in sequence in a first direction, the first direction being an axial direction of the rotor assembly, and a magnetic separation plate arranged between adjacent core units, the core units being formed with a first flow channel and a first communication port in communication with the first flow channel, the first communication port being arranged towards the magnetic separation plate, the magnetic separation plate being formed with a second flow channel and a second communication port in communication with the second flow channel, the first communication port and the second communication port being opposite and in communication in the first direction, and the second flow channel being in communication with the oil inlet; a protective sleeve arranged outside the rotor core, the protective sleeve being fixedly connected with the magnetic separation plate and the rotor core.

2. The rotor assembly of claim 1, wherein The elastic modulus of the magnetic separation plate and the core units is different.

3. The rotor assembly of claim 1, wherein The core units are made of amorphous material.

4. The rotor assembly of claim 1, wherein The magnetic separation plate is made of aluminum alloy material.

5. The rotor assembly of claim 1, wherein The protective sleeve is made of carbon fiber material.

6. The rotor assembly of claim 1, wherein The second flow channel is open at least on one side in the first direction, and the core unit arranged on the open side of the second flow channel covers the open side of the second flow channel.

7. The rotor assembly of claim 1, wherein The second flow channel extends in a radial direction of the rotor assembly, and a plurality of second flow channels are arranged at intervals in a circumferential direction of the rotor assembly.

8. The rotor assembly of claim 1, wherein The magnetic separation plate is further formed with a communication hole penetrating the magnetic separation plate in the first direction, the communication hole being in communication with the second flow channel, and both ends of the communication hole in the first direction being formed as the second communication port.

9. The rotor assembly of claim 8, wherein, One second flow channel is in communication with one or more communication holes.

10. The rotor assembly of claim 8, wherein The core unit comprises a core body and a permanent magnet, the core body being formed with a plurality of permanent magnet grooves penetrating the core body in the first direction, the permanent magnet being arranged in the permanent magnet groove, and the permanent magnet and an inner wall of the permanent magnet groove cooperatively defining the first flow channel, The number of communication holes is plural, and the plurality of communication holes correspond to and are in communication with the plurality of permanent magnet grooves.

11. The rotor assembly of any of claims 1-10, wherein, Further comprising: a rotating shaft, the rotor core and the magnetic separation plate being arranged on the rotating shaft, the rotating shaft being formed with a third flow channel extending in an axial direction of the rotor core, the third flow channel being in communication between the oil inlet and the second flow channel.

12. The rotor assembly of claim 1, wherein Further comprising: an end plate arranged at both ends of the rotor core in the axial direction, the protective sleeve being located between the two end plates in the axial direction of the rotor core, and the end faces of both ends of the protective sleeve being respectively attached to the two end plates.

13. The rotor assembly of claim 12, wherein, The thickness of the end plate is greater than the thickness of the magnetic separation plate.

14. The rotor assembly of claim 12, wherein, The end plate is formed with a fourth flow channel, the fourth flow channel being in communication between the first flow channel and an oil outlet of the rotor assembly.

15. The rotor assembly of claim 14, wherein, The fourth flow channel is recessed from a side surface of the end plate towards the rotor core, and the fourth flow channel penetrates an outer peripheral surface of the end plate in a radial direction of the core unit to form the oil outlet.

16. The rotor assembly of claim 14, wherein The core units are two, the first flow channel penetrates the core units in an axial direction of the core units, and both ends of the first flow channel are in communication with the second flow channel and the fourth flow channel, respectively.

17. An electric machine characterized by Comprising: The rotor assembly of any of claims 1-16.

18. A vehicle characterized by comprising: Comprising: The electric machine of claim 17.

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