Rotor cooling device, motor and vehicle

Abstract

The utility model discloses a rotor cooling device, a motor and a vehicle, the device comprises a rotating shaft, a rotor core and an end plate, a cooling channel is arranged in the rotor core, a plurality of inner oil holes are arranged in the circumferential direction of the rotating shaft, the cooling channel comprises a plurality of first channels and a plurality of second channels, the plurality of first channels are arranged along the circumferential direction of the rotor iron core, the plurality of second channels are arranged at the circumferential outer sides of the plurality of first channels, the circumferential direction of the end plate is provided with a plurality of oil guide grooves and a plurality of oil throwing holes, the adjacent first channels are arranged along the axial direction of the rotor iron core in a reverse extending manner, and the adjacent second channels are arranged along the axial direction of the rotor iron core. One end of the first channel is communicated with the inner oil hole, the other end of the first channel is communicated with the oil guide groove, the second channel is arranged along the axial direction of the rotor iron core in a penetrating manner, one end of the second channel is communicated with the oil guide groove, and the other end of the second channel is communicated with the oil throwing hole. The cooling efficiency of the rotor cooling device is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a rotor cooling device, a motor and a vehicle. Background Art

[0002] In order to help a motor dissipate heat during operation and maintain its performance and service life, it is necessary to arrange cooling channels in the rotor core. The cooling channels can carry away the heat generated by the motor by circulating a cooling fluid, so as to keep the temperature of the motor within a suitable range. The layout path of the cooling channels can affect the heat dissipation efficiency of the motor. In the existing cooling channels, they penetrate the rotor core axially. End plates are respectively arranged at both ends of the rotor core. The cooling fluid enters from one end of the end plate, flows through the cooling channels and is discharged from the other end of the end plate. The cooling range of the flow path of the fluid in the cooling channels is limited, and thus the heat dissipation effect of the cooling channels is not high. Therefore, it is necessary to design a rotor cooling device with improved heat dissipation efficiency. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the above technical problems, and provide a rotor cooling device, a motor and a vehicle, so as to realize a more reasonable layout of the flow path of the fluid in the cooling channels, expand the cooling range and improve the cooling efficiency. To achieve the above purpose, the technical solution of the utility model is as follows:

[0004] The rotor cooling device includes a rotating shaft, a rotor core sleeved outside the rotating shaft, and end plates located at both ends of the rotor core. A cooling channel is arranged in the rotor core. A plurality of inner oil holes are arranged in the circumferential direction of the rotating shaft. The cooling channel includes a plurality of first channels and a plurality of second channels. The plurality of first channels are arranged along the circumferential direction of the rotor core. The plurality of second channels are arranged on the circumferential outer side of the plurality of first channels. A plurality of oil guiding grooves and a plurality of oil throwing holes are arranged in the circumferential direction of the end plate. Adjacent first channels extend axially in opposite directions along the rotor core. One end of the first channel is communicated with the inner oil hole, and the other end of the first channel is communicated with the oil guiding groove. The second channel penetrates axially along the rotor core. One end of the second channel is communicated with the oil guiding groove, and the other end of the second channel is communicated with the oil throwing hole.

[0005] Specifically, an inner channel is arranged axially inside the rotating shaft, and a plurality of the inner oil holes penetrating the inner channel are arranged in the circumferential direction of the rotating shaft.

[0006] Specifically, a plurality of magnet slots for installing magnetic steel are arranged in the circumferential direction of the rotor core. Weight reduction holes are arranged between adjacent magnet slots. The plurality of weight reduction holes are axially communicated to form a second channel.

[0007] Specifically, the rotor core includes a plurality of first rotor punching groups, a plurality of second rotor punching groups, and a plurality of third rotor punching groups; the first rotor punching groups, the second rotor punching groups, and the third rotor punching groups are stacked along the axial direction of the rotating shaft.

[0008] Specifically, a first rotor shaft hole is provided at the center of the first rotor punching group, and a plurality of first arc grooves are provided in the circumferential direction of the first rotor shaft hole. A first arc portion is formed between adjacent first arc grooves; a second rotor shaft hole is provided at the center of the second rotor punching group, and a plurality of second arc grooves are provided in the circumferential direction of the second rotor shaft hole. A second arc portion is formed between adjacent second arc grooves; a third rotor shaft hole is provided at the center of the third rotor punching group, and a plurality of third arc grooves are provided in the circumferential direction of the third rotor shaft hole. A connecting portion is formed between adjacent third arc grooves; the first arc groove, the second arc groove, and the third arc groove communicate to form a first channel. The second arc portion and the third arc groove are axially adjacent, and the second arc portion forms a blocking end of the first channel along the axial direction.

[0009] Specifically, a first convex key extending axially is provided on the first arc portion, a second convex key extending axially is provided on the second arc portion, and a third convex key extending axially is provided on the connecting portion. Upper key grooves and lower key grooves are respectively provided on both sides of the outer wall of the rotating shaft. The first convex key, the second convex key, and the third convex key are respectively in clamping fit with the corresponding upper key groove or lower key groove.

[0010] Specifically, a end plate shaft hole is provided at the center of the end plate. The end plate is sleeved on the rotating shaft through the end plate shaft hole. End plate convex keys are respectively provided on both sides of the end plate shaft hole. The end plate convex keys are respectively in clamping fit with the upper key groove and the lower key groove.

[0011] Specifically, an oil slinging groove is provided on the end face of the end plate between adjacent oil guiding grooves. The oil slinging groove communicates with the second channel. Oil slinging holes are provided on the circumferential edge of the end plate. The oil slinging groove communicates with the oil slinging holes.

[0012] A motor includes the rotor cooling device described above.

[0013] A vehicle includes the motor described above.

[0014] Compared with the prior art, the beneficial effects of the rotor cooling device, the motor, and the vehicle of the present utility model are mainly reflected in:

[0015] The cooling fluid is led out from the inner oil hole and flows towards the end plates at both ends through a number of first channels. On the one hand, it cools down the outer wall of the rotating shaft to expand the cooling range; on the other hand, it prolongs the flow path of the cooling fluid. The number of first channels are arranged to extend alternately in opposite directions along the circumferential direction, which can ensure that the cooling fluid quickly flows to the end plates and improve the cooling efficiency. A number of second channels penetrate through both ends of the rotor core along the axial direction, which can cool down the positions where the magnetic steels are arranged on the rotor core. The cooling channels are reasonably arranged to improve the heat dissipation effect of the overall rotor cooling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the rotor cooling device provided by an embodiment of the present application;

[0017] Figure 2 is a schematic front sectional view of the rotor cooling device provided by an embodiment of the present application;

[0018] Figure 3 is one of the schematic structural diagrams of the rotating shaft provided by an embodiment of the present application;

[0019] Figure 4 is another schematic structural diagram of the rotating shaft provided by an embodiment of the present application;

[0020] Figure 5 is one of the schematic structural diagrams of the rotor core provided by an embodiment of the present application;

[0021] Figure 6 is another schematic structural diagram of the rotor core provided by an embodiment of the present application;

[0022] Figure 7 is still another schematic structural diagram of the rotor core provided by an embodiment of the present application;

[0023] Figure 8 is an end face schematic diagram of the first rotor punching sheet group provided by an embodiment of the present application;

[0024] Figure 9 is an end face schematic diagram of the second rotor punching sheet group provided by an embodiment of the present application;

[0025] Figure 10 is an end face schematic diagram of the third rotor punching sheet group provided by an embodiment of the present application;

[0026] Figure 11 is a schematic structural diagram of the end plate provided by an embodiment of the present application.

[0027] Reference Signs:

[0028] Rotating shaft 1, inner channel 11, inner oil hole 12, upper keyway 13, lower keyway 14, retaining ring 15;

[0029] Rotating core 2, first rotor punching sheet group 21, first rotor shaft hole 211, first arc groove 212, first arc part 213, first convex key 214, second rotor punching sheet group 22, second rotor shaft hole 221, second arc groove 222, second arc part 223, second convex key 224, third rotor punching sheet group 23, third rotor shaft hole 231, third arc groove 232, connecting part 233, third convex key 234;

[0030] End plate 3, oil guide groove 31, oil slinging hole 32, end plate shaft hole 33, end plate convex key 331, oil slinging groove 34;

[0031] Cooling channel 4, first channel 41, second channel 42, weight reduction hole 43. Specific implementation mode

[0032] In order to make the technical solutions and advantages in the embodiments of the present application clearer and more understandable, the following further details the exemplary embodiments of the present application with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than an exhaustive list of all embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0033] Embodiment 1

[0034] This embodiment provides a rotor cooling device, including a rotating shaft 1, a rotor core 2 sleeved outside the rotating shaft 1, and end plates 3 sleeved outside the rotating shaft 1 and located at both ends of the rotor core 2.

[0035] A cooling channel 4 is arranged in the rotor core 2, and a cooling fluid is introduced into the cooling channel 4, and the cooling fluid cools the rotating shaft 1 and the rotor core 2. The cooling fluid can be cooling oil or coolant, and this embodiment does not make any restrictions.

[0036] Figure 1 It is a schematic structural diagram of the rotor cooling device provided by the embodiment of the present application; Figure 2 It is a main view sectional schematic diagram of the rotor cooling device provided by the embodiment of the present application; Figure 3 It is one of the schematic structural diagrams of the rotating shaft provided by the embodiment of the present application; Figure 9 It is a schematic structural diagram of the end plate provided by the embodiment of the present application.

[0037] As Figures 1-3 、 Figure 9As shown in the figure, this embodiment provides a rotor cooling device. An inner channel 11 is arranged inside the rotating shaft 1, and a plurality of inner oil holes 12 penetrating the inner channel 11 are arranged circumferentially on the rotating shaft 1. The cooling channel 4 includes a plurality of first channels 41 arranged at intervals along the circumference of the rotor core 2 and a plurality of second channels 42 arranged at intervals along the circumference of the rotor core 2 and located on the circumferential outer side of the plurality of first channels 41. The circumferential direction of the end plate 3 is provided with oil guide grooves 31 and oil slinging holes 32 arranged alternately at intervals. Adjacent first channels 41 extend axially in opposite directions along the rotor core 2. One end of the first channel 41 is communicated with the inner oil hole 12, and the other end of the first channel 41 is communicated with the oil guide groove 31. The second channel 42 is arranged axially through the rotor core 2. One end of the second channel 42 is communicated with the oil guide groove 31, and the other end of the second channel 42 is communicated with the oil slinging hole 32.

[0038] Inside the rotating shaft 1 provided in this embodiment, an inner channel 11 is arranged along its axial direction, and a plurality of inner oil holes 12 are arranged along the axial direction in the middle of the rotating shaft 1. Each inner oil hole 12 is in one-to-one correspondence and communication with each first channel 41. A cooling fluid flows in the inner channel 11. The cooling fluid enters the first channel 41 from the inner oil hole 12, passes through the oil guide groove 31 on the end plate 3 again, and then passes through the second channel 42. The cooling fluid is discharged from the oil slinging hole 32. The cooling fluid discharged from the oil slinging hole 32 can cool the stator assembly outside the rotor. The first channel 41 is located on the outer wall of the rotating shaft 1. The cooling fluid passing through the first channel 41 can effectively cool the outer wall of the rotating shaft 1; the second channel 42 is close to the magnetic steel of the rotor core 2. The cooling fluid passing through the second channel 42 can effectively cool the magnetic steel.

[0039] In this embodiment, the cooling fluid in the inner channel 11 is led out from the inner oil hole 12 and flows towards the end plates 3 at both ends through a plurality of first channels 41 respectively. On the one hand, it cools and reduces the temperature of the outer wall of the rotating shaft 1, expanding the cooling range; on the other hand, it prolongs the flow path of the cooling fluid. The plurality of first channels 41 are arranged to extend alternately in opposite directions along the circumference, which can ensure that the cooling fluid quickly flows to the end plate 3 and improve the cooling efficiency; the plurality of second channels 42 penetrate through both ends of the rotor core 2 axially, which can cool and reduce the temperature of the positions where the magnetic steel is arranged on the rotor core 2; the cooling channel 4 is reasonably arranged to improve the heat dissipation effect of the overall rotor cooling device.

[0040] Embodiment Two

[0041] This embodiment optimizes the rotor cooling device on the basis of the above embodiment, especially provides a specific implementation manner of the rotor core:

[0042] The above-mentioned rotor core 2 includes a number of rotor punching sheet groups, and each rotor punching sheet group is formed by laminating a number of rotor punching sheets. The number of rotor punching sheet groups is stacked along the axial direction of the rotating shaft 1 to form the rotor core 2. The structures of the number of rotor punching sheets in each rotor punching sheet group are the same, and the structures of each rotor punching sheet group may be different. In this embodiment, three rotor punching sheet groups are taken as examples for illustration.

[0043] Figure 2 It is a schematic front sectional view of the rotor cooling device provided by the embodiment of the present application; Figure 3 It is one of the schematic structural diagrams of the rotating shaft provided by the embodiment of the present application; Figure 4 It is the second schematic structural diagram of the rotating shaft provided by the embodiment of the present application; Figure 5 It is one of the schematic structural diagrams of the rotor core provided by the embodiment of the present application; Figure 6 It is the second schematic structural diagram of the rotor core provided by the embodiment of the present application; Figure 7 It is the third schematic structural diagram of the rotor core provided by the embodiment of the present application; Figures 8-10 It is the schematic end view of the three rotor cores provided by the embodiment of the present application.

[0044] As Figures 2-10 shown, the rotor core 2 includes a number of first rotor punching sheet groups 21, a number of second rotor punching sheet groups 22, and a number of third rotor punching sheet groups 23. The diameters of the first rotor punching sheet group 21, the second rotor punching sheet group 22, and the third rotor punching sheet group 23 are the same, and a number of magnet slots for installing magnets are respectively provided along the circumferential direction. Every two magnet slots form a set of structures arranged oppositely. A weight-reducing hole 43, also known as a strength hole, is provided in the middle of a set of magnet slots. When a number of rotor punching sheet groups are combined to form the rotor core 2, a number of weight-reducing holes 43 communicate axially to form a second channel 42 for the transportation of cooling fluid. The weight-reducing hole 43 in the rotor punching sheet group is used as the flow path of the cooling fluid, and there is no need to punch additional holes in the rotor punching sheet, which ensures the strength performance of the rotor punching sheet. Moreover, the weight-reducing hole 43 is closer to the magnet, and the cooling fluid flowing through the second channel 42 can effectively cool the magnet.

[0045] A first rotor shaft hole 211 is provided at the center of the first rotor punching sheet group 21. A number of first arc-shaped grooves 212 are provided in the circumferential direction of the first rotor shaft hole 211. In this embodiment, the number of the first arc-shaped grooves 212 is three. A first arc-shaped part 213 is formed between adjacent first arc-shaped grooves 212. A first convex key 214 extending axially is provided on a first arc-shaped part 213.

[0046] A second rotor punching group 22 is provided with a second rotor shaft hole 221 at its center. A plurality of second arc-shaped grooves 222 are circumferentially arranged on the second rotor shaft hole 221. In this embodiment, the number of the plurality of second arc-shaped grooves 222 is three. A second arc-shaped portion 223 is formed between adjacent second arc-shaped grooves 222. A second convex key 224 extending axially is arranged on one second arc-shaped portion 223.

[0047] A third rotor punching group 23 is provided with a third rotor shaft hole 231 at its center. A plurality of third arc-shaped grooves 232 are circumferentially arranged on the third rotor shaft hole 231. In this embodiment, the number of the plurality of third arc-shaped grooves 232 is six. A connecting portion 233 is formed between adjacent third arc-shaped grooves 232. A third convex key 234 extending axially is arranged on one connecting portion 233.

[0048] Upper key grooves 13 and lower key grooves 14 are symmetrically arranged on both sides of the outer wall of the rotating shaft 1 respectively. The first convex key 214, the second convex key 224, and the third convex key 234 are respectively in clamping fit with the corresponding upper key groove 13 or lower key groove 14. A retaining ring 15 for positioning the end plate 3 is circumferentially arranged on the outer wall of the rotating shaft 1.

[0049] During the assembly process of the rotor core 2, it is necessary to ensure the angle of the rotor skew poles. In the case of the cooperation between the convex key and the keyway, the installation angle of the rotor punching set can be changed, and it is ensured that the first channel 41 can communicate with the oil guiding groove 31 of the end plate 3, the second channel 42 can communicate with the oil guiding groove 31 of the end plate 3, and at the same time communicate with the oil throwing hole 32 of the end plate 3. The assembly process of the rotor cooling device is as follows: A end plate 3 is sleeved on the outer wall of the rotating shaft 1 and abuts against the stop ring 15; The first rotor punching set 21A is axially inserted into the rotating shaft 1 and press-fitted against the end plate 3, so that the first convex key 214 of the first rotor punching set 21A is clamped and matched with the upper keyway 13, and the first arc-shaped groove 212 of the first rotor punching set 21A communicates with the oil guiding groove 31; The second rotor punching set 22B is axially inserted into the rotating shaft 1 and press-fitted against the first rotor punching set 21A, so that the second convex key 224 of the second rotor punching set 22B is clamped and matched with the lower keyway 14, and the second arc-shaped groove 222 communicates with the first arc-shaped groove 212; The third rotor punching set 23C is axially inserted into the rotating shaft 1 and press-fitted against the second rotor punching set 22B, so that the third convex key 234 of the third rotor punching set 23C is clamped and matched with the lower keyway 14, and part of the third arc-shaped groove 232 communicates with the second arc-shaped groove 222, and the second arc-shaped part 223 of the second rotor punching set 22B axially blocks part of the third arc-shaped groove 232; The third rotor punching set 23c is axially inserted into the rotating shaft 1 and press-fitted against the third rotor punching set 23C, so that the third convex key 234 of the third rotor punching set 23c is clamped and matched with the lower keyway 14, and the third arc-shaped groove 232 of the third rotor punching set 23C communicates with the third arc-shaped groove 232 of the third rotor punching set 23c; The second rotor punching set 22b is axially inserted into the rotating shaft 1 and press-fitted against the third rotor punching set 23c, so that the second convex key 224 of the second rotor punching set 22b is clamped and matched with the upper keyway 13; The first rotor punching set 21a is axially inserted into the rotating shaft 1 and press-fitted against the second rotor punching set 22b, so that the first convex key 214 of the first rotor punching set 21a is clamped and matched with the lower keyway 14; The other end plate 3 is axially inserted into the rotating shaft 1 and abuts against the first rotor punching set 21a, and the first arc-shaped groove 212 of the first rotor punching set 21a communicates with the oil guiding groove 31; Among them, the first rotor punching set 21a is installed on the rotating shaft 1 in a way that rotates 180° relative to the first rotor punching set 21A, and the second rotor punching set 22b is installed on the rotating shaft 1 in a way that rotates 180° relative to the second rotor punching set 22B.

[0050] The first arc-shaped groove 212, the second arc-shaped groove 222, and the third arc-shaped groove 232 communicate to form a first channel 41. The second arc-shaped portion 223 of the second rotor punching group 22B and the second arc-shaped portion 223 of the second rotor punching group 22b respectively form the blocking ends of the first channel 41 along the axial direction, so that the cooling fluid led out from the inner oil hole 12 is respectively guided to flow towards both ends of the rotor core 2, improving the efficiency of transporting the cooling fluid from the inner oil hole 12 to the end plates 3 at both ends.

[0051] Embodiment III

[0052] Based on the above embodiments, this embodiment optimizes the rotor cooling device, especially provides a specific implementation manner of the end plate:

[0053] Figure 2 It is a schematic front sectional view of the rotor cooling device provided by the embodiment of the present application; Figure 3 It is one of the schematic structural diagrams of the rotating shaft provided by the embodiment of the present application; Figure 9 It is a schematic structural diagram of the end plate provided by the embodiment of the present application.

[0054] As Figure 2 , Figure 3 , Figure 9 shown, oil guiding grooves 31 and oil throwing holes 32 are arranged at intervals and alternately in the circumferential direction of the above end plate 3. An end plate shaft hole 33 is provided at the center of the end plate 3. The end plate 3 is sleeved on the rotating shaft 1 through the end plate shaft hole 33. End plate convex keys 331 are symmetrically arranged on both sides of the end plate shaft hole 33, and the end plate convex keys 331 are respectively clamped and matched with the upper key groove 13 and the lower key groove 14 of the rotating shaft 1.

[0055] One end of the oil guiding groove 31 communicates with the first channel 41, and the other end of the oil guiding groove 31 communicates with the second channel 42; the oil guiding groove 31 is arranged radially along the end face of the end plate 3.

[0056] An oil throwing groove 34 is arranged on the end face of the end plate 3 between adjacent oil guiding grooves 31. The oil throwing groove 34 communicates with the second channel 42; an oil throwing hole 32 is arranged at the circumferential edge of the end plate 3, and the oil throwing groove 34 is communicated with the oil throwing hole 32. The cooling fluid flows through the second channel 42 and enters the oil throwing groove 34, and accumulates in the oil throwing groove 34. The cooling fluid is discharged through the oil throwing hole 32, thereby cooling the stator assembly outside the rotor cooling device.

[0057] Embodiment IV

[0058] This embodiment provides a motor, including the rotor cooling device in the above embodiment.

[0059] Embodiment V

[0060] This embodiment provides a vehicle, including the motor in the above embodiment.

[0061] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 thus should not be construed as a limitation to the present application.

[0062] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0063] In the present application, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0064] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0065] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. Rotor cooling device, including a rotating shaft, a rotor core sleeved outside the rotating shaft, and end plates located at both ends of the rotor core, wherein a cooling channel is provided in the rotor core, and it is characterized in that: A plurality of inner oil holes are arranged in the circumference of the rotating shaft, and the cooling channel includes a plurality of first channels and a plurality of second channels, wherein the plurality of first channels are arranged along the circumference of the rotor core, and the plurality of second channels are arranged on the circumferential outside of the plurality of first channels, and a plurality of oil guide grooves and a plurality of oil throwing holes are arranged in the circumference of the end plate, and adjacent first channels are extended in opposite directions along the axial direction of the rotor core, one end of the first channel is communicated with the inner oil hole, and the other end of the first channel is communicated with the oil guide groove, and the second channel is arranged through the axial direction of the rotor core, one end of the second channel is communicated with the oil guide groove, and the other end of the second channel is communicated with the oil throwing hole.

2. The rotor cooling device according to claim 1, wherein: An inner channel is axially arranged inside the rotating shaft, and a plurality of inner oil holes penetrating the inner channel are circumferentially arranged on the rotating shaft.

3. The rotor cooling device according to claim 1, wherein: The rotor core is provided with a plurality of magnetic steel slots for installing magnetic steel along the circumferential direction, and weight-reducing holes are provided between adjacent magnetic steel slots. The plurality of weight-reducing holes are connected along the axial direction to form a second channel.

4. The rotor cooling device according to claim 1, wherein: The rotor core includes a plurality of first rotor sheet groups, a plurality of second rotor sheet groups, and a plurality of third rotor sheet groups; the first rotor sheet groups, the second rotor sheet groups, and the third rotor sheet groups are stacked along the axial direction of the rotating shaft.

5. The rotor cooling device according to claim 4, wherein: A first rotor shaft hole is arranged at the center of the first rotor punching group, a plurality of first arcuate grooves are arranged in the circumference of the first rotor shaft hole, and a first arcuate portion is formed between adjacent first arcuate grooves; a second rotor shaft hole is arranged at the center of the second rotor punching group, a plurality of second arcuate grooves are arranged in the circumference of the second rotor shaft hole, and a second arcuate portion is formed between adjacent second arcuate grooves; a third rotor shaft hole is arranged at the center of the third rotor punching group, a plurality of third arcuate grooves are arranged in the circumference of the third rotor shaft hole, and a connecting portion is formed between adjacent third arcuate grooves; the first arcuate groove, the second arcuate groove and the third arcuate groove are connected to form a first channel, the second arcuate portion is adjacent to the third arcuate groove in the axial direction, and the second arcuate portion forms a blocking end of the first channel in the axial direction.

6. The rotor cooling device according to claim 5, characterized in that: The first arc-shaped portion is provided with a first cam key extending along the axial direction, the second arc-shaped portion is provided with a second cam key extending along the axial direction, the connecting portion is provided with a third cam key extending along the axial direction, and upper key grooves and lower key grooves are respectively provided on both sides of the outer wall of the rotating shaft, and the first cam key, the second cam key and the third cam key are respectively engaged with the corresponding upper key groove or lower key groove.

7. The rotor cooling device according to claim 6, characterized in that: An end plate shaft hole is arranged at the center of the end plate, and the end plate is mounted on the rotating shaft through the end plate shaft hole. End plate convex keys are arranged on both sides of the end plate shaft hole, and the end plate convex keys are respectively engaged with the upper keyway and the lower keyway.

8. The rotor cooling device according to claim 1, characterized in that: An oil-slinging groove is arranged on the end surface of the end plate between adjacent oil guide grooves, and the oil-slinging groove is communicated with the second channel. The oil-slinging hole is arranged on the circumferential edge of the end plate, and the oil-slinging groove is communicated with the oil-slinging hole.

9. Electric motor, characterized in that: Comprising a rotor cooling device as described in any one of claims 1-8.

10. A vehicle, characterized in that: Comprising the motor as claimed in claim 9.

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