Rotor assembly, motor and vehicle

Abstract

The utility model discloses a rotor assembly, a motor and a vehicle, relates to the technical field of vehicles, and aims to solve the problem that the flow of a cooling medium cannot be uniformly distributed in a first flow guide channel and a second flow guide channel. The rotor assembly comprises a first partition plate, the first partition plate is provided with a first flow guide channel and a second flow guide channel which are communicated together, and the cross section area of the first flow guide channel in the direction perpendicular to the flow direction of a cooling medium is larger than that of the second flow guide channel in the direction perpendicular to the flow direction of the cooling medium; the rotor assembly rotates around the first direction, and in the first direction, the first flow guide channel is located in front of the second flow guide channel. According to the rotor assembly provided by the utility model, when the rotor assembly rotates around the first direction, the flow of the cooling medium in the first flow guide channel and the second flow guide channel can be uniformly distributed, so that the cooling medium can uniformly cool the first partition plate, and the cooling effect is improved.

Description

TECHNICAL FIELD

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

[0002] In prior art, the structure of the cooling oil channel of the magnetic separation plate of some rotor assemblies is Y-shaped. When the motor works, the rotor assembly rotates, and the cooling liquid flows in the cooling oil channel. At this time, under the action of the Coriolis force, the cooling liquid will deviate towards the direction opposite to the rotating direction when flowing, and finally the cooling liquid will form vortex and backflow, resulting in that the oil channel in the front side of the rotating direction in the cooling oil channel is not filled with cooling liquid, which is not conducive to the cooling of the magnetic separation plate. SUMMARY

[0003] The utility model discloses a rotor assembly, motor and vehicle, which aims to solve the problem that the flow of cooling medium cannot be uniformly distributed in the first flow guide channel and the second flow guide channel.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] On the one hand, the utility model provides a rotor assembly, which comprises a first partition plate, the first partition plate is provided with a first flow guide channel and a second flow guide channel which are communicated together, the cross-sectional area of the first flow guide channel perpendicular to the flow direction of the cooling medium is greater than the cross-sectional area of the second flow guide channel perpendicular to the flow direction of the cooling medium, and the rotor assembly rotates around the first direction. In the first direction, the first flow guide channel is located in front of the second flow guide channel.

[0006] According to the rotor assembly of the utility model embodiment, by making the cross-sectional area of the first flow guide channel of the first partition plate perpendicular to the flow direction of the cooling medium greater than the cross-sectional area of the second flow guide channel perpendicular to the flow direction of the cooling medium. Therefore, compared with the traditional rotor assembly, when the rotor assembly rotates around the first direction, the flow of the cooling medium in the first flow guide channel and the second flow guide channel can be uniformly distributed, which is conducive to the uniform cooling of the first partition plate by the cooling medium and improves the cooling effect.

[0007] In some embodiments, when the rotor assembly rotates around the first direction, the flow of the cooling medium in the first flow guide channel and the flow of the cooling medium in the second flow guide channel are uniformly distributed.

[0008] In some embodiments, the rotor assembly further comprises a second partition plate arranged opposite to the first partition plate, the second partition plate is provided with a first flow guide channel and a second flow guide channel, the first flow guide channel is communicated with the first flow guide channel, and the second flow guide channel is communicated with the second flow guide channel.

[0009] In some embodiments, the first partition further comprises a third flow guide channel and a fourth flow guide channel, the second partition further comprises a third flow guide channel and a fourth flow guide channel, the third flow guide channel has a cross-sectional area perpendicular to the flow direction of the cooling medium greater than that of the fourth flow guide channel; the third flow guide channel is in communication with the third flow guide channel, and the fourth flow guide channel is in communication with the fourth flow guide channel.

[0010] In some embodiments, in the first direction, the third flow guide channel is located in front of the fourth flow guide channel.

[0011] In some embodiments, the depth of the first flow guide channel along the second direction is greater than the depth of the second flow guide channel along the second direction; the depth of the third flow guide channel along the second direction is greater than the depth of the fourth flow guide channel along the second direction, wherein the second direction is the axial direction of the rotor assembly.

[0012] In some embodiments, the ratio of the depth of the first flow guide channel in the second direction to the depth of the second flow guide channel in the second direction is 1.5-3;

[0013] The ratio of the depth of the third flow guide channel in the second direction to the depth of the fourth flow guide channel in the second direction is 1.5-3.

[0014] In some embodiments, the first flow guide channel comprises a first flow passage and a second flow passage in communication, the first flow passage extends along the radial direction of the first partition, one end of the second flow passage is connected to the first flow passage, and the other end of the second flow passage is deflected relative to the first flow passage towards the first direction;

[0015] The third flow guide channel comprises a third flow passage and a fourth flow passage in communication, the third flow passage extends along the radial direction of the second partition, one end of the fourth flow passage is connected to the third flow passage, and the other end of the fourth flow passage is deflected relative to the third flow passage towards the first direction.

[0016] In some embodiments, one end of the second flow passage is in communication with the second flow guide channel, and the second flow guide channel is deflected away from the first direction relative to the first flow passage;

[0017] One end of the fourth flow passage is in communication with the fourth flow guide channel, and the fourth flow guide channel is deflected away from the first direction relative to the third flow passage.

[0018] In some embodiments, one end of the first flow guide channel and the second flow guide channel away from the center of the first partition penetrates the circumferential outer wall surface of the second partition;

[0019] One end of the third flow guide channel and the fourth flow guide channel away from the center of the second partition penetrates the circumferential outer wall surface of the first partition.

[0020] In some embodiments, the projection of the second flow passage and the second flow guide channel on the second partition respectively coincides with the first flow guide channel and the second flow guide channel.

[0021] The fourth flow channel and the fourth flow guide channel are respectively coincident with the third flow guide channel and the fourth flow guide channel in the projection of the first partition plate.

[0022] In some embodiments, the rotor assembly further comprises: a rotor core comprising opposite first and second faces and first and second core passages extending through the rotor core;

[0023] The first and second partition plates are respectively attached to the first and second faces, and the first core passage communicates the first flow guide channel and the first flow guide channel, and the second core passage respectively communicates the second flow guide channel and the second flow guide channel.

[0024] In some embodiments, a first magnetic member is arranged in the first core passage, the first magnetic member divides the first core passage into a first sub-passage and a second sub-passage, and the first and second sub-passages both communicate the first flow guide channel and the first flow guide channel.

[0025] A second magnetic member is arranged in the second core passage, the second magnetic member divides the second core passage into a third sub-passage and a fourth sub-passage, and the third and fourth sub-passages both communicate the second flow guide channel and the second flow guide channel.

[0026] In some embodiments, the rotor core further comprises third and fourth core passages extending through the rotor core, the third core passage communicates the third flow guide channel and the third flow guide channel, and the fourth core passage communicates the fourth flow guide channel and the fourth flow guide channel.

[0027] In some embodiments, a third magnetic member is arranged in the third core passage, the third magnetic member divides the third core passage into a fifth sub-passage and a sixth sub-passage, and the fifth and sixth sub-passages both communicate the third flow guide channel and the third flow guide channel.

[0028] A fourth magnetic member is arranged in the fourth core passage, the fourth magnetic member divides the fourth core passage into a seventh sub-passage and an eighth sub-passage, and the seventh and eighth sub-passages both communicate the fourth flow guide channel and the fourth flow guide channel.

[0029] In some embodiments, the first and second core passages are coincident with the first and second flow guide channels in the projection of the first partition plate.

[0030] The third and fourth core passages are coincident with the third and fourth flow guide channels in the projection of the second partition plate.

[0031] In some embodiments, the rotor assembly further comprises: a rotating shaft, the first partition plate, the rotor core and the second partition plate are sequentially sleeved on the rotating shaft, the rotating shaft is provided with a first flow guide hole and a second flow guide hole penetrating through a side wall of the rotating shaft, the first flow guide hole communicates with the first flow channel of the first partition plate, and the second flow guide hole communicates with the third flow channel of the second partition plate.

[0032] In some embodiments, the rotating shaft further comprises a through hole penetrating through the center of the rotating shaft in the second direction, and the through hole communicates with the first flow guide hole and the second flow guide hole.

[0033] In some embodiments, the first partition plate is provided with a first mounting hole penetrating in the second direction, the second partition plate is provided with a second mounting hole penetrating in the second direction, the first partition plate is sleeved on the rotating shaft through the first mounting hole, and the second partition plate is sleeved on the rotating shaft through the second mounting hole.

[0034] In another aspect, the utility model provides a motor which comprises the above rotor assembly.

[0035] In still another aspect, the utility model provides a vehicle which comprises the above rotor assembly or the above motor.

[0036] It can be understood that the rotor assembly, the motor and the vehicle provided by the above embodiments of the utility model have the beneficial effects as described above, and the details are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description can only be some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0038] Figure 1 It is a structural schematic view of the rotor assembly provided according to some embodiments.

[0039] Figure 2 It is a structural schematic view of the first partition plate provided according to some embodiments.

[0040] Figure 3 It is a structural schematic view of the second partition plate provided according to some embodiments.

[0041] Figure 4 It is a structural schematic view of the rotor core provided according to some embodiments.

[0042] Figure 5 It is a structural schematic view of the rotating shaft provided according to some embodiments.

[0043] REFERENCE SIGNS:

[0044] 100, rotor assembly;

[0045] 1, first partition plate; 11, first flow guide channel; 111, first flow passage; 112, second flow passage; 12, second flow guide channel; 13, third flow guide channel; 14, fourth flow guide channel; 15, first mounting hole; 16, first matching part;

[0046] 2, second partition plate; 21, first flow guide channel; 22, second flow guide channel; 23, third flow guide channel; 231, third flow passage; 232, fourth flow passage; 24, fourth flow guide channel; 25, second mounting hole; 26, second matching part;

[0047] 3, rotor core; 31, first core passage; 311, first magnetic part; 312, first sub-path; 313, second sub-path; 32, second core passage; 321, second magnetic part; 322, third sub-path; 323, fourth sub-path; 33, third core passage; 331, third magnetic part; 332, fifth sub-path; 333, sixth sub-path; 34, fourth core passage; 341, fourth magnetic part; 342, seventh sub-path; 343, eighth sub-path;

[0048] 4, rotating shaft; 41, through hole; 42, first flow guide hole; 43, second flow guide hole; 44, matching groove. DETAILED DESCRIPTION

[0049] The technical solutions in some embodiments of the present disclosure will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present disclosure, not all the embodiments. Based on the embodiments provided in the present disclosure, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present disclosure.

[0050] In the description of the present disclosure, it should be understood that the terms "center", "upper", "lower", "top", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation to the present disclosure.

[0051] Unless otherwise required by context, as used herein the term "comprises" or "comprising" or the like is used on the basis and mutually consistent manner that the term includes but is not limited to. As used in the description of the specification, the terms "an embodiment", "some embodiments", "exemplary embodiments", "exemplary", or "some examples" are used to indicate that the particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the disclosure. The illustrating representations of the above terms are not necessarily meant to refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics can be included in any one or more embodiments or examples in any appropriate manner.

[0052] Hereinafter, the terms "first", "second", etc. are used only for the purpose of description and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Thus, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the disclosure, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0053] In describing some embodiments, "coupled" and "connected", and variations thereof, can be used. For example, the term "connected" can be used to indicate that two or more components are in direct physical or electrical contact with each other. As another example, the term "coupled" can be used to indicate that two or more components are in direct physical or electrical contact with each other. However, the term "coupled" can also mean that two or more components are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited by the content herein.

[0054] In the context of the disclosure, the meanings of "on", "over", and "above" should be interpreted in the broadest manner, such that "on" means not only "directly on", but also includes the meaning of "on" with intermediate features or layers therebetween, and "over" or "above" means not only "over" or "above", but also includes the meaning of "over" or "above" without intermediate features or layers therebetween (i.e., directly on).

[0055] Exemplary embodiments are described herein with reference to cross-sectional and / or plan view illustrations that are schematic and for purposes of illustration only. Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, exemplary embodiments should not be construed as limited to the particular shapes of the regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region illustrated as a rectangle will typically have rounded or curved features. Thus, the regions illustrated in the figures are schematic and their shapes are not intended to illustrate the precise shape of a region that would be formed by a fabrication technique and are not intended to limit the scope of exemplary embodiments.

[0056] As Figure 1 illustrated, embodiments of the present application provide a vehicle, the vehicle comprising a rotor assembly 100 or a motor having the rotor assembly 100 described above.

[0057] The rotor assembly 100 described above is described in detail below.

[0058] In one aspect, as Figures 1-2 illustrated, the utility model provides a rotor assembly 100, comprising a first partition 1.

[0059] The first partition 1 is provided with a first flow guide channel 11 and a second flow guide channel 12 which are communicated together, the cross-sectional area of the first flow guide channel 11 in the direction perpendicular to the flow direction of the cooling medium is greater than the cross-sectional area of the second flow guide channel 12 in the direction perpendicular to the flow direction of the cooling medium. The rotor assembly 100 rotates around a first direction, in the first direction, the first flow guide channel 11 is located in front of the second flow guide channel 12.

[0060] For example, in Figure 2 the example, the first flow guide channel 11 and the second flow guide channel 12 are formed by the surface of the first partition 1 being recessed, so that the first flow guide channel 11 and the second flow guide channel 12 can accommodate the cooling medium, the cooling medium can flow in the first flow guide channel 11 and the second flow guide channel 12, so that the cooling medium can play a cooling role on the first partition 1.

[0061] In the prior art, in the first direction, the first flow channel 11 is located in front of the second flow channel 12, and the cross-sectional area of the first flow channel 11 perpendicular to the flow direction of the cooling medium is equal to the cross-sectional area of the second flow channel 12 perpendicular to the flow direction of the cooling medium. At this time, when the rotor assembly 100 rotates around the first direction, under the action of the Coriolis force, the cooling medium will flow to the opposite direction of the first direction, and finally form a vortex and a backflow, so that the flow of the cooling medium in the second flow channel 12 is greater than the flow of the cooling medium in the first flow channel 11. When the speed is large, the cooling medium will completely enter the second flow channel 12, and there is no flow of the cooling medium in the first flow channel 11, so that the cooling medium can only cool the surrounding of the second flow channel 12, thereby causing the cooling of the first partition plate 1 by the cooling medium to be uneven, and there are local hot spots.

[0062] When a particle moves linearly relative to an inertial system, its trajectory relative to a rotating system is a curve. Based on the rotating system, we believe that there is a force driving the particle trajectory to form a curve, and this force is the Coriolis force.

[0063] In the present application, by making the cross-sectional area of the first flow channel 11 perpendicular to the flow direction of the cooling medium greater than the cross-sectional area of the second flow channel 12 perpendicular to the flow direction of the cooling medium, the capacity of the first flow channel 11 is greater than the capacity of the second flow channel 12. Therefore, the flow of the cooling medium that can be accommodated in the second flow channel 12 is less than the flow of the cooling medium that can be accommodated in the first flow channel 11. When the rotor assembly 100 rotates around the first direction, due to the reduced capacity of the second flow channel 12, the flow of the cooling medium entering the second flow channel 12 under the influence of the Coriolis force is limited, thereby increasing the flow in the first flow channel 11, so that the flow of the cooling medium in the first flow channel 11 and the second flow channel 12 can be uniformly distributed, which is beneficial to the uniform cooling of the first partition plate 1 by the cooling medium, and improves the cooling effect of the rotor assembly 100.

[0064] According to the rotor assembly 100 of the embodiment of the present application, by making the cross-sectional area of the first flow channel 11 of the first partition plate 1 perpendicular to the flow direction of the cooling medium greater than the cross-sectional area of the second flow channel 12 perpendicular to the flow direction of the cooling medium. Therefore, compared with the traditional rotor assembly, when the rotor assembly 100 rotates around the first direction, the flow of the cooling medium in the first flow channel 11 and the second flow channel 12 can be uniformly distributed, which is beneficial to the uniform cooling of the first partition plate 1 by the cooling medium, and improves the cooling effect.

[0065] In some embodiments, with reference to Figure 1When the rotor assembly 100 rotates around the first direction, the flow of the cooling medium in the first flow channel 11 and the flow of the cooling medium in the second flow channel 12 are uniformly distributed. When the rotor assembly 100 rotates, the cooling medium will be offset towards the first flow channel 11 under the action of the Coriolis force. The cross-sectional area of the second flow channel 12 perpendicular to the flow direction of the cooling medium is smaller than the cross-sectional area of the first flow channel 11 perpendicular to the flow direction of the cooling medium, which reduces the capacity of the second flow channel 12, reduces the flow of the cooling medium in the second flow channel 12, and reduces the influence of the Coriolis force on the flow of the cooling medium. The flow of the cooling medium in the first flow channel 11 and the flow of the cooling medium in the second flow channel 12 are uniformly distributed, thereby improving the cooling effect of the cooling medium on the first partition plate 1, so that the first partition plate 1 can be uniformly cooled.

[0066] When the rotational speed of the rotor assembly 100 is greater than or equal to 30000 revolutions per second, the rotor assembly 100 reaches a high-speed high-loss working condition, at which time the action of the Coriolis force will be more obvious. However, since the cross-sectional area of the second flow channel 12 perpendicular to the flow direction of the cooling medium is smaller than the cross-sectional area of the first flow channel 11 perpendicular to the flow direction of the cooling medium, the influence of the Coriolis force on the flow of the cooling medium can be reduced, thereby improving the cooling effect of the cooling medium on the first partition plate 1.

[0067] In some embodiments, the rotor assembly 100 further comprises a second partition plate 2 opposite to the first partition plate 1, and the second partition plate 2 is provided with a first flow guide channel 21 and a second flow guide channel 22. The first flow guide channel 21 communicates with the first flow channel 11, and the second flow guide channel 22 communicates with the second flow channel 12.

[0068] For example, in the example of Figure 3 The first flow guide channel 21 and the second flow guide channel 22 are formed by recessing the surface of the second partition plate 2, so that the first flow guide channel 21 and the second flow guide channel 22 can accommodate the cooling medium, and the cooling medium can flow in the first flow guide channel 21 and the second flow guide channel 22, thereby enabling the cooling medium to cool the second partition plate 2. When the rotor assembly 100 rotates around the first direction, the cooling medium can flow from the first flow channel 11 and the second flow channel 12 into the first flow guide channel 21 and the second flow guide channel 22, so that the cooling medium can cool the first partition plate 1 and the second partition plate 2, improve the cooling efficiency of the cooling medium, prolong the service life of the first partition plate 1 and the second partition plate 2, and enable the rotor assembly 100 to work normally.

[0069] In some embodiments, as Figure 2 and Figure 3As shown, the first partition plate 1 is further provided with a third flow channel 13 and a fourth flow channel 14, and the second partition plate 2 is further provided with a third flow guide channel 23 and a fourth flow guide channel 24. The cross-sectional area of the third flow guide channel 23 in the direction perpendicular to the flow direction of the cooling medium is greater than the cross-sectional area of the fourth flow guide channel 24 in the direction perpendicular to the flow direction of the cooling medium. The third flow channel 13 is in communication with the third flow guide channel 23, and the fourth flow channel 14 is in communication with the fourth flow guide channel 24.

[0070] As shown, Figure 2 The third flow channel 13 and the fourth flow channel 14 are also formed by the surface recess of the first partition plate 1, so that the third flow channel 13 and the fourth flow channel 14 can accommodate the cooling medium. The third flow guide channel 23 and the fourth flow guide channel 24 are also formed by the surface recess of the second partition plate 2, so that the third flow guide channel 23 and the fourth flow guide channel 24 can accommodate the cooling medium. When the rotor assembly 100 rotates in the first direction, the cooling medium can also flow from the third flow guide channel 23 and the fourth flow guide channel 24 of the second partition plate 2 to the third flow channel 13 and the fourth flow channel 14 of the first partition plate 1, so that the cooling medium can cool the second partition plate 2 and the first partition plate 1, thereby improving the cooling efficiency of the cooling medium on the rotor assembly 100.

[0071] As shown, Figure 3 By setting the cross-sectional area of the third flow guide channel 23 in the direction perpendicular to the flow direction of the cooling medium to be greater than the cross-sectional area of the fourth flow guide channel 24 in the direction perpendicular to the flow direction of the cooling medium, the flow rates of the cooling medium that can be accommodated in the third flow guide channel 23 and the fourth flow guide channel 24 are different. When the rotor assembly 100 rotates in the first direction, the influence of the Coriolis force on the flow direction of the cooling medium during the rotation of the rotor assembly 100 is reduced, so that the flow rates of the cooling medium in the third flow guide channel 23 and the fourth flow guide channel 24 are uniformly distributed, thereby enabling the second partition plate 2 to be uniformly cooled and improving the cooling effect of the cooling medium on the second partition plate 2.

[0072] It should be noted that the case where the cross-sectional area of the third flow guide channel 23 in the direction perpendicular to the flow direction of the cooling medium is greater than the cross-sectional area of the fourth flow guide channel 24 in the direction perpendicular to the flow direction of the cooling medium can be that the width of the third flow guide channel 23 is different from the width of the fourth flow guide channel, or that the depth of the third flow guide channel 23 is different from the depth of the fourth flow guide channel.

[0073] The case where the cross-sectional area of the first flow guide channel 11 in the direction perpendicular to the flow direction of the cooling medium is greater than the cross-sectional area of the second flow guide channel 12 in the direction perpendicular to the flow direction of the cooling medium can be that the width of the first flow guide channel 11 is different from the width of the second flow guide channel 12, or that the depth of the first flow guide channel 11 is different from the depth of the second flow guide channel 12.

[0074] In summary, this method can achieve uniform cooling of the second partition 2 and the first partition 1, thereby improving the cooling effect.

[0075] Furthermore, such as Figure 3 As shown, in the first direction, the third guide channel 23 is located in front of the fourth guide channel 24. When the rotor assembly 100 rotates around the first direction, the cooling medium flows into the fourth guide channel 24 under the action of the Coriolis force. The fourth guide channel 24 has a smaller cross-sectional area perpendicular to the cooling medium flow direction, resulting in a smaller capacity for the cooling medium. This limits the flow rate of the cooling medium into the fourth guide channel 24, while increasing the flow rate of the cooling medium in the third guide channel 23. This reduces the influence of the Coriolis force on the flow direction of the cooling medium, resulting in a more uniform flow rate distribution of the cooling medium in both the third and fourth guide channels 23 and 24. This facilitates uniform cooling of the second baffle 2 and improves the cooling effect of the rotor assembly 100.

[0076] In some embodiments, refer to Figure 1 and Figure 2 The depth of the first flow channel 11 along the second direction is greater than the depth of the second flow channel 12 along the second direction. As a result, the capacity of the first flow channel 11 is greater than the capacity of the second flow channel 12, which in turn makes the flow rate of the cooling medium in the first flow channel 11 greater than the flow rate of the cooling medium in the second flow channel 12.

[0077] Reference Figure 1 and Figure 3 The depth of the third guide channel 23 along the second direction is greater than the depth of the fourth guide channel 24 along the second direction, where the second direction is the axial direction of the rotor assembly 100. Therefore, the capacity of the third guide channel 23 is greater than the capacity of the fourth guide channel 24, resulting in a greater flow rate of the cooling medium in the third guide channel 23 than in the fourth guide channel 24.

[0078] In summary, the rotor assembly 100 can overcome the influence of Coriolis force when it rotates. When the rotor assembly 100 rotates around the first direction, the flow rate of the cooling medium in the first guide channel 11 and the second guide channel 12 on the first partition 1 can be evenly distributed, and the flow rate in the third guide channel 23 and the fourth guide channel 24 on the second partition 2 can be evenly distributed, ensuring that the first partition 1 and the second partition 2 can be uniformly cooled, which is beneficial to improving the cooling effect.

[0079] Furthermore, the ratio of the depth of the first guide channel 11 in the second direction to the depth of the second guide channel 12 in the second direction is 1.5-3;

[0080] The ratio of the depth of the third guide channel 23 in the second direction to the depth of the fourth guide channel 24 in the second direction is 1.5-3.

[0081] For example, in Figure 2 In the example, when the ratio of the depth of the first guide channel 11 to the depth of the second guide channel 12 in the second direction is less than 1.5, or the ratio of the depth of the third guide channel 23 to the depth of the fourth guide channel 24 in the second direction is less than 1.5, the depths of the first guide channel 11 and the second guide channel 12 are very similar, and the depths of the third guide channel 23 and the fourth guide channel 24 are also very similar. When the rotor assembly 100 rotates around the first direction, on the first partition 1, the cooling medium flows to the second guide channel 12 under the action of the Coriolis force, still resulting in a large flow rate of the cooling medium in the second guide channel 12. On the second partition 2, the cooling medium flows to the fourth guide channel 24 under the action of the Coriolis force, still resulting in a large flow rate of the cooling medium in the fourth guide channel 24. The first partition 1 or the second partition 2 is heated unevenly, resulting in local hot spots.

[0082] Please see Figure 3 When the ratio of the depth of the first guide channel 11 to the depth of the second guide channel 12 in the second direction is greater than 3, or the ratio of the depth of the third guide channel 23 to the depth of the fourth guide channel 24 in the second direction is greater than 3, the depths of the first guide channel 11 and the second guide channel 12 differ significantly, and the depths of the third guide channel 23 and the fourth guide channel 24 also differ significantly. With this configuration, on the first baffle 1, the flow rate of the cooling medium in the first guide channel 11 is greater than the flow rate in the second guide channel 12. On the second baffle 2, the flow rate of the cooling medium in the third guide channel 23 is greater than the flow rate in the fourth guide channel 24, still resulting in uneven heating.

[0083] Therefore, the ratio of the depth of the first guide channel 11 in the second direction to the depth of the second guide channel 12 in the second direction is 1.5-3, and the ratio of the depth of the third guide channel 23 in the second direction to the depth of the fourth guide channel 24 in the second direction is 1.5-3. This makes the flow rate of the cooling medium in the first guide channel 11 and the second guide channel 12 uniformly distributed, and the flow rate of the cooling medium in the third guide channel 23 and the fourth guide channel 24 uniformly distributed. This is beneficial for uniform cooling of the first baffle 1 and the second baffle 2, and improves the cooling efficiency of the rotor assembly 100.

[0084] In some embodiments, refer to Figure 2The first flow channel 11 includes a first flow passage 111 and a second flow passage 112 which are connected in series. The first flow passage 111 extends along the radial direction of the first partition plate 1. One end of the second flow passage 112 is connected to the first flow passage 111, and the other end of the second flow passage 112 is deflected towards the first direction relative to the first flow passage 111.

[0085] The first flow passage 111 extends along the radial direction of the first partition plate 1 from the center of the first partition plate 1 to the edge of the first partition plate 1. The second flow passage 112 is connected to the end of the first flow passage 111 which is away from the center of the first partition plate 1. The other end of the second flow passage 112 extends along the direction towards the edge of the first partition plate 1 and is deflected towards the first direction. Thus, when the rotor assembly 100 rotates in the first direction, the cooling medium can enter the second flow passage 112 from the first flow passage 111, increasing the flow area of the cooling medium on the first partition plate 1 and improving the cooling effect on the first partition plate 1.

[0086] Referring to Figure 3 The third flow channel 23 includes a third flow passage 231 and a fourth flow passage 232 which are connected in series. The third flow passage 231 extends along the radial direction of the second partition plate 2. One end of the fourth flow passage 232 is connected to the third flow passage 231, and the other end of the fourth flow passage 232 is deflected towards the first direction relative to the third flow passage 231. The third flow passage 231 extends along the radial direction of the second partition plate 2 from the center of the second partition plate 2 to the edge of the second partition plate 2. The fourth flow passage 232 is connected to the end of the third flow passage 231 which is away from the center of the second partition plate 2. The other end of the fourth flow passage 232 extends along the direction towards the edge of the second partition plate 2 and is deflected towards the first direction. Thus, when the rotor assembly 100 rotates in the first direction, the cooling medium can enter the fourth flow passage 232 from the third flow passage 231 and flow into the fourth flow channel 24 under the action of the Coriolis force, increasing the flow area of the cooling medium on the second partition plate 2 and improving the cooling effect on the second partition plate 2.

[0087] In some embodiments, one end of the second flow passage 112 is connected to the second flow channel 12, and the second flow channel 12 is deflected away from the first direction relative to the first flow passage 111. As shown in Figure 2 One end of the second flow passage 112 adjacent to the first flow passage 111 is connected to the second flow channel 12. The second flow channel 12 is symmetrically arranged with the second flow passage 112 about the first flow passage 111. The first flow channel 11 and the second flow channel 12 form a Y-shaped structure. Thus, when the rotor assembly 100 rotates in the first direction, the cooling medium can enter the second flow passage 112 from the first flow passage 111, increasing the flow area of the cooling medium on the first partition plate 1 and improving the cooling ability of the cooling medium on the first partition plate 1.

[0088] One end of the fourth flow passage 232 is connected to the fourth flow channel 24, and the fourth flow channel 24 is deflected away from the first direction relative to the third flow passage 231. As shown inFigure 3 As shown, one end of the fourth flow channel 232 adjacent to the third flow channel 231 is communicated with the fourth flow guide passage 24. The fourth flow guide passage 24 is symmetrically arranged with the fourth flow channel 232 about the third flow channel 231. The third flow guide passage 23 and the fourth flow guide passage 24 constitute a Y-shaped structure, thereby when the rotor assembly 100 rotates in the first direction, the cooling medium can enter the fourth flow channel 232 from the third flow channel 231 and flow into the fourth flow guide passage 24 under the action of the Coriolis force, so that the flow area of the cooling medium on the second partition plate 2 is increased, and the cooling capacity of the cooling medium on the second partition plate 2 is improved.

[0089] In this way, the cooling efficiency of the cooling medium on the first partition plate 1 and the second partition plate 2 is improved, and the normal work of the rotor assembly 100 is ensured.

[0090] In some embodiments, the first flow guide passage 21 and the second flow guide passage 22 are both penetrated to the circumferential outer wall surface of the second partition plate 2 at the end away from the center of the second partition plate 2. Referring to Figure 2 When the cooling medium flows in the first flow guide passage 21 and the second flow guide passage 22, the cooling medium can be thrown out of the second partition plate 2 from the end of the first flow guide passage 21 and the second flow guide passage 22 away from the center of the second partition plate 2, respectively, so that the cooling medium flows to other components of the motor. In this way, the cooling work path of the cooling medium in the first partition plate 1 and the second partition plate 2 is completed.

[0091] The third flow guide passage 13 and the fourth flow guide passage 14 are both penetrated to the circumferential outer wall surface of the first partition plate 1 at the end away from the center of the first partition plate 1. Referring to Figure 3 When the cooling medium flows in the third flow guide passage 13 and the fourth flow guide passage 14, the cooling medium can be thrown out of the first partition plate 1 from the end of the third flow guide passage 13 and the fourth flow guide passage 14 away from the center of the first partition plate 1, respectively, so that the cooling medium flows to other components of the motor. In this way, the cooling work path of the cooling medium in the first partition plate 1 and the second partition plate 2 is completed.

[0092] In this way, the inlet and outlet paths of the cooling medium in the first partition plate 1 and the second partition plate 2 are determined, which is beneficial to the working efficiency of the cooling medium and also enables the motor to work normally.

[0093] In some embodiments, as Figures 1-3 As shown, the projection of the second flow channel 112 and the second flow guide passage 12 on the second partition plate 2 are respectively coincident with the first flow guide passage 21 and the second flow guide passage 22. In this way, the cooling medium in the second flow channel 112 can flow into the first flow guide passage 21, and the cooling medium in the second flow guide passage 12 can flow into the second flow guide passage 22, so that the cooling medium can smoothly flow between the first partition plate 1 and the second partition plate 2.

[0094] As shown in Figures 1-3 The fourth flow channel 232 and the fourth guide flow channel 24 are respectively coincident with the third guide flow channel 13 and the fourth guide flow channel 14 in the projection of the first partition plate 1. In this way, the cooling medium in the fourth flow channel 232 can flow into the third guide flow channel 13, and the cooling medium in the fourth guide flow channel 24 can flow into the fourth guide flow channel 14, so that the cooling can smoothly flow between the first partition plate 1 and the second partition plate 2. Thus, the cooling medium can smoothly flow in the first partition plate 1 and the second partition plate 2, so that the cooling medium can smoothly cool the first partition plate 1 and the second partition plate 2, avoiding the cooling medium remaining in the first partition plate 1 or the second partition plate 2, and ensuring the normal operation of the rotor assembly 100.

[0095] Among them, on the first partition plate 1, the number of the first guide flow channel 11 and the second guide flow channel 12 can be multiple, and the number of the third guide flow channel 13 and the fourth guide flow channel 14 can be multiple. The multiple first guide flow channels 11 and the multiple second guide flow channels 12, the multiple third guide flow channels 13 and the multiple fourth guide flow channels 14 are arranged along the circumference of the first partition plate 1. For example, in the example of Figure 2 The number of the first guide flow channel 11 and the second guide flow channel 12 is 3, and the number of the third guide flow channel 13 and the fourth guide flow channel 14 is 3.

[0096] On the second partition plate 2, the number of the first guide flow channel 21 and the second guide flow channel 22 can be multiple, and the number of the third guide flow channel 23 and the fourth guide flow channel 24 can be multiple. The multiple first guide flow channels 21 and the multiple second guide flow channels 22, the multiple third guide flow channels 23 and the multiple fourth guide flow channels 24 are arranged along the circumference of the second partition plate 2.

[0097] For example, in the example of Figure 3 The number of the first guide flow channel 21 and the second guide flow channel 22 is 3. The number of the third guide flow channel 23 and the fourth guide flow channel 24 is 3.

[0098] On the rotor assembly 100, the first partition plate 1 and the second partition plate 2 are mirror-symmetric, so that when the rotor assembly 100 rotates around the first direction, the first partition plate 1 and the second partition plate 2 can be uniformly cooled.

[0099] In summary, the distribution area of the cooling medium on the first partition plate 1 and the second partition plate 2 is relatively uniform, which can greatly cool the first partition plate 1 and the second partition plate 2, and improve the cooling efficiency.

[0100] In some embodiments, the rotor assembly 100 further comprises a rotor core 3. The rotor core 3 comprises opposite first and second faces and first and second core passages 31 and 32 extending through the rotor core 3. The first and second baffles 1 and 2 are attached to the first and second faces respectively, and the first core passage 31 communicates the first and first guide passages 11 and 21, and the second core passage 32 communicates the second and second guide passages 12 and 22 respectively.

[0101] For example, in the example of Figure 1 and Figure 4 , the rotor core 3 is cylindrical in shape. The first and second faces of the rotor core 3 are located at opposite ends of the rotor core 3 in the second direction. The first and second core passages 31 and 32 extend through the rotor core 3 in the second direction. The first and second guide passages 11 and 12 of the first baffle 1 are opposite the first and second core passages 31 and 32, and the first and second guide passages 21 and 22 of the second baffle 2 are opposite the first and second core passages 31 and 32. In this way, when the rotor assembly 100 rotates, the cooling medium flows in the first and second guide passages 11 and 12, through the first and second core passages 31 and 32, into the first and second guide passages 21 and 22, and finally out of the first and second guide passages 21 and 22 from the second baffle 2. In this way, the cooling medium in the first and second baffles 1 and 2 is able to flow, allowing the cooling medium to cool the rotor assembly 100, reducing the temperature of the rotor assembly 100, and reducing the thermal fatigue of the rotor assembly 100.

[0102] Further, the first core passage 31 is provided with a first magnetic member 311 therein, the first magnetic member 311 divides the first core passage 31 into a first sub-passage 312 and a second sub-passage 313, and the first and second sub-passages 312 and 313 both communicate the first and first guide passages 11 and 21. Referring to Figure 4 , the first magnetic member 311 is fixed in the first core passage 31 to enable the rotor assembly 100 to operate normally. The first magnetic member 311 has opposite sides in the width direction thereof and the first and second sub-passages 312 and 313 are formed between the opposite sides of the first magnetic member 311 and the opposite sides of the first core passage 31 in the width direction thereof, and the first and second sub-passages 312 and 313 both extend through the rotor core 3 in the axial direction thereof to communicate the first and first guide passages 11 and 21.

[0103] Referring to Figure 4The second magnetic member 321 is arranged in the second core passage 32, and the second magnetic member 321 divides the second core passage 32 into a third sub-passage 322 and a fourth sub-passage 323, and the third sub-passage 322 and the fourth sub-passage 323 are both connected to the second flow channel 12 and the second flow guide channel 22. The second magnetic member 321 is fixed in the second core passage 32, so that the rotor assembly 100 can work normally. The third sub-passage 322 and the fourth sub-passage 323 are respectively formed between the two sides of the width direction of the second magnetic member 321 and the two sides of the width direction of the second core passage 32, and the third sub-passage 322 and the fourth sub-passage 323 both penetrate the axial direction of the rotor core 3, so as to connect the second flow channel 12 and the second flow guide channel 22.

[0104] In this way, when the cooling medium flows in the first sub-passage 312, the second sub-passage 313, the third sub-passage 322 and the fourth sub-passage 323, the cooling medium can flow from the first partition plate 1 to the second partition plate 2, and the first magnetic member 311 and the second magnetic member 321 can be cooled, so as to improve the working efficiency of the rotor assembly 100 and prolong the service life of the rotor assembly 100.

[0105] Further, referring to Figure 4 The rotor core 3 further comprises a third core passage 33 and a fourth core passage 34 penetrating the rotor core 3, and the third core passage 33 connects the third flow channel 23 and the third flow guide channel 13, and the fourth core passage 34 connects the fourth flow channel 24 and the fourth flow guide channel 14. In this way, the cooling medium flows in the third flow channel 23 and the fourth flow channel 24, and then flows through the third core passage 33 and the fourth core passage 34, and then enters the third flow guide channel 13 and the fourth flow guide channel 14, and finally is thrown out of the first partition plate 1 from the third flow guide channel 13 and the fourth flow guide channel 14. Therefore, the cooling medium completes the cooling of the rotor assembly 100, so as to reduce the temperature of the rotor assembly 100 and reduce the thermal fatigue of the rotor assembly 100.

[0106] Further, referring to Figure 4 The third magnetic member 331 is arranged in the third core passage 33, and the third magnetic member 331 divides the third core passage 33 into a fifth sub-passage 332 and a sixth sub-passage 333, and the fifth sub-passage 332 and the sixth sub-passage 333 are both connected to the third flow channel 23 and the third flow guide channel 13. The third magnetic member 331 is fixed in the third core passage 33, so that the rotor assembly 100 can work normally. The fifth sub-passage 332 and the sixth sub-passage 333 are respectively formed between the two sides of the width direction of the third magnetic member 331 and the two sides of the width direction of the third core passage 33, and the fifth sub-passage 332 and the sixth sub-passage 333 both penetrate the axial direction of the rotor core 3, so as to connect the third flow channel 23 and the third flow guide channel 13.

[0107] Referring to Figure 4A fourth magnetic element 341 is provided within the fourth core passage 34. The fourth magnetic element 341 divides the fourth core passage 34 into a seventh sub-passage 342 and an eighth sub-passage 343, both of which connect to the fourth guide channel 24 and the fourth drain channel 14. The fourth magnetic element 341 is fixed within the fourth core passage 34 to enable the rotor assembly 100 to operate normally. The seventh sub-passage 342 and the eighth sub-passage 343 are formed between the two sides of the fourth magnetic element 341 in the width direction and the two sides of the fourth core passage 34 in the width direction, respectively. The seventh sub-passage 342 and the eighth sub-passage 343 both penetrate the axial direction of the rotor core 3 to connect the fourth guide channel 24 and the fourth drain channel 14.

[0108] With this configuration, when the cooling medium flows in the fifth sub-channel 332, the sixth sub-channel 333, the seventh sub-channel 342 and the eighth sub-channel 343, the first magnetic element 311 and the second magnetic element 321 can be cooled simultaneously, thereby improving the working efficiency of the rotor assembly 100 and increasing the service life of the rotor assembly 100.

[0109] Among them, the first magnetic component 311, the second magnetic component 321, the third magnetic component 331 and the fourth magnetic component 341 can be permanent magnets.

[0110] In some embodiments, such as Figures 1-3 As shown, the projections of the first core passage 31 and the second core passage 32 onto the first partition 1 coincide with the projections of the first guide channel 11 and the second guide channel 12 onto the first partition 1. The projections of the third core passage 33 and the fourth core passage 34 onto the second partition 2 coincide with the projections of the third guide channel 23 and the fourth guide channel 24. This arrangement ensures that all the cooling medium in the first guide channel 11 and the second guide channel 12 flows through the first core passage 31 and the second core passage 32 and enters the first guide channel 21 and the second guide channel 22. Simultaneously, all the cooling medium in the third guide channel 23 and the fourth guide channel 24 flows through the third core passage 33 and the fourth core passage 34 and enters the third guide channel 13 and the fourth guide channel 14. In summary, this improves the cooling efficiency of the rotor assembly 100, increases the working efficiency of the rotor assembly 100, and reduces the waste of cooling medium.

[0111] Reference Figure 4The number of the first core passages 31 and the second core passages 32 can be multiple, and the number of the third core passages 33 and the fourth core passages 34 can be multiple. The multiple first core passages 31 and the multiple second core passages 32, the multiple third core passages 33 and the multiple fourth core passages 34 are arranged in a circumferential direction of the rotor core 3. The number of the first core passages 31 and the second core passages 32, the third core passages 33 and the fourth core passages 34 corresponds to the number of the first flow channels 11 and the second flow channels 12, the third flow channels 23 and the fourth flow channels 24.

[0112] In this way, the working efficiency of the rotor core 3 is improved, and the cooling medium can flow smoothly in the rotor core 3, thereby achieving cooling of the rotor core 3.

[0113] In some embodiments, referring to Figure 1 and Figure 5 , the rotor assembly 100 further comprises a rotating shaft 4. The first partition plate 1, the rotor core 3 and the second partition plate 2 are sequentially sleeved on the rotating shaft 4 and are fixed by bolts or other fasteners, so that the first partition plate 1, the rotor core 3 and the second partition plate 2 are tightly attached to each other, thereby ensuring the tightness of the connection between the first partition plate 1, the rotor core 3 and the second partition plate 2 when the rotor assembly 100 rotates.

[0114] The rotating shaft 4 is provided with a first flow hole 42 and a second flow hole 43 penetrating the side wall of the rotating shaft 4. The first flow hole 42 communicates with the first flow channel 111 of the first partition plate 1, and the second flow hole 43 communicates with the third flow channel 231 of the second partition plate 2. The position of the first flow hole 42 corresponds to the position of the first partition plate 1, and the position of the second flow hole 43 corresponds to the position of the second partition plate 2. In this way, the cooling medium can enter the first flow channel 111 through the first flow hole 42 and enter the third flow channel 231 through the second flow hole 43, so that the cooling medium can enter the first partition plate 1 and the second partition plate 2 to perform cooling work, thereby improving the cooling efficiency.

[0115] Further, as shown in Figure 5 , the rotating shaft 4 further comprises a through hole 41 penetrating the center of the rotating shaft 4 in the second direction. The through hole 41 communicates with the first flow hole 42 and the second flow hole 43. The through hole 41 can accommodate the cooling medium. The cooling medium can enter the first partition plate 1 and the second partition plate 2 through the first flow hole 42 and the second flow hole 43, so that the cooling medium can cool the first partition plate 1 and the second partition plate 2, thereby improving the working efficiency of the rotor assembly 100, prolonging the service life of the rotor assembly 100, and reducing the weight of the rotating shaft 4, thereby reducing the working consumption.

[0116] Referring to Figure 4The first flow guide hole 42 and the second flow guide hole 43 are both two in number, so that the speed of the cooling medium flowing into the first partition plate 1 and the second partition plate 2 respectively can be improved, and the cooling efficiency can be improved.

[0117] In some embodiments, with reference to Figures 1-3 The first partition plate 1 is provided with a first mounting hole 15 penetrating along the second direction, and the second partition plate 2 is provided with a second mounting hole 25 penetrating along the second direction, the first partition plate 1 is sleeved on the rotating shaft 4 through the first mounting hole 15, and the second partition plate 2 is sleeved on the rotating shaft 4 through the second mounting hole 25.

[0118] The first mounting hole 15 and one of the rotating shaft 4 are provided with a first matching part 16, the first mounting hole 15 and the other of the rotating shaft 4 are provided with a matching groove 44, and the second mounting hole 25 is provided with a second matching part 26.

[0119] With reference to Figures 1-3 The first mounting hole 15 is located at the center of the first partition plate 1. The second mounting hole 25 is located at the center of the second partition plate 2. The first mounting hole 15 is provided with a first matching part 16, and the first matching part 16 is formed by the side wall of the first mounting hole 15. The second mounting hole 25 is provided with a second matching part 26, and the second matching part 26 is formed by the side wall of the second mounting hole 25.

[0120] The rotating shaft 4 is provided with a matching groove 44, and the matching groove 44 is formed by the outer side wall of the rotating shaft 4 being recessed, and the matching groove 44 extends along the second direction. When the first partition plate 1 and the second partition plate 2 are sleeved on the rotating shaft 4, the first matching part 16 and the second matching part 26 are matched with the matching groove 44, so that the first partition plate 1 and the second partition plate 2 cannot rotate relative to the rotating shaft 4, the relative fixation between the first partition plate 1 and the second partition plate 2 and the rotating shaft 4 is ensured during the rotation of the rotor assembly 100, the structural strength of the rotor assembly 100 is improved, and the rotor assembly 100 can work normally.

[0121] As shown in Figure 2 and Figure 3 The number of the first matching part 16 is two, and the number of the second matching part 26 is two. In this way, the connection between the first partition plate 1 and the second partition plate 2 and the rotating shaft 4 can be strengthened, and the structural strength of the rotor assembly 100 can be further improved.

[0122] On the other hand, the utility model provides a kind of motor (not shown in figure), including above rotor assembly 100. In this way, the cooling efficiency is improved, and then service life is prolonged, and work efficiency is improved.

[0123] According to the motor of the embodiment of the utility model, the rotor assembly 100 is used, the cooling effect of the motor is improved, and the service life of the motor is prolonged.

[0124] In still another aspect, the utility model provides a kind of vehicle (not shown in figure), including the rotor assembly 100 as above;Or the motor as above.

[0125] According to the vehicle of the embodiment of the utility model, the rotor assembly 100 or the motor as above is used, the cooling efficiency of rotor assembly 100 is improved, and the performance of vehicle is improved, and the use experience of user is improved.

[0126] The above is only the specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of change or replacement within the technical range disclosed by the utility model, should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be the protection scope of claim.

Claims

1. A rotor assembly (100) characterized by, The application relates to a rotor assembly (100) for a centrifugal compressor, comprising: a first partition plate (1) provided with a first flow channel (11) and a second flow channel (12) in communication, wherein a cross-sectional area of the first flow channel (11) perpendicular to a flow direction of a cooling medium is greater than a cross-sectional area of the second flow channel (12) perpendicular to the flow direction of the cooling medium; the rotor assembly (100) rotates around a first direction, and in the first direction, the first flow channel (11) is located in front of the second flow channel (12).

2. The rotor assembly (100) of claim 1, wherein When the rotor assembly (100) rotates around the first direction, the flow of the cooling medium in the first flow channel (11) and the flow of the cooling medium in the second flow channel (12) are uniformly distributed.

3. The rotor assembly (100) of claim 1, wherein, Further comprising: a second partition plate (2) provided opposite to the first partition plate (1), wherein the second partition plate (2) is provided with a first flow guide channel (21) and a second flow guide channel (22), the first flow guide channel (21) is in communication with the first flow channel (11), and the second flow guide channel (22) is in communication with the second flow channel (12).

4. The rotor assembly (100) of claim 3, wherein The first partition plate (1) is further provided with a third flow guide channel (13) and a fourth flow guide channel (14), and the second partition plate (2) is further provided with a third flow channel (23) and a fourth flow channel (24), wherein a cross-sectional area of the third flow channel (23) perpendicular to the flow direction of the cooling medium is greater than a cross-sectional area of the fourth flow channel (24) perpendicular to the flow direction of the cooling medium; the third flow guide channel (13) is in communication with the third flow channel (23), and the fourth flow guide channel (14) is in communication with the fourth flow channel (24).

5. The rotor assembly (100) of claim 4, wherein, In the first direction, the third flow channel (23) is located in front of the fourth flow channel (24).

6. The rotor assembly (100) of claim 5, wherein A depth of the first flow channel (11) along a second direction is greater than a depth of the second flow channel (12) along the second direction; a depth of the third flow channel (23) along the second direction is greater than a depth of the fourth flow channel (24) along the second direction, wherein the second direction is an axial direction of the rotor assembly (100).

7. The rotor assembly (100) of claim 6, wherein A ratio of the depth of the first flow channel (11) in the second direction to the depth of the second flow channel (12) in the second direction is 1.5-3; a ratio of the depth of the third flow channel (23) in the second direction to the depth of the fourth flow channel (24) in the second direction is 1.5-3.

8. The rotor assembly (100) of claim 7, wherein The first flow channel (11) comprises a first flow passage (111) and a second flow passage (112) in communication, the first flow passage (111) extends along a radial direction of the first partition plate (1), one end of the second flow passage (112) is connected to the first flow passage (111), and the other end of the second flow passage (112) is deflected towards the first direction relative to the first flow passage (111). The third flow channel (23) comprises a third flow passage (231) and a fourth flow passage (232) which are communicated, the third flow passage (231) extends along the radial direction of the second partition plate (2), one end of the fourth flow passage (232) is connected to the third flow passage (231), and the other end of the fourth flow passage (232) is deflected towards the first direction relative to the third flow passage (231).

9. The rotor assembly (100) of claim 8, wherein, The one end of the second flow passage (112) is communicated with the second flow channel (12), and the second flow channel (12) is deflected away from the first direction relative to the first flow passage (111); The one end of the fourth flow passage (232) is communicated with the fourth flow channel (24), and the fourth flow channel (24) is deflected away from the first direction relative to the third flow passage (231).

10. The rotor assembly (100) of claim 4, wherein, The one end of the first flow channel (21) and the second flow channel (22) away from the center of the first partition plate (1) penetrates the circumferential outer wall surface of the second partition plate (2); The one end of the third flow channel (13) and the fourth flow channel (14) away from the center of the second partition plate (2) penetrates the circumferential outer wall surface of the first partition plate (1).

11. The rotor assembly (100) of claim 8, wherein, The projection of the second flow passage (112) and the second flow channel (12) on the second partition plate (2) respectively coincide with the first flow channel (21) and the second flow channel (22); The projection of the fourth flow passage (232) and the fourth flow channel (24) on the first partition plate (1) respectively coincide with the third flow channel (13) and the fourth flow channel (14).

12. The rotor assembly (100) of claim 11, characterized by Further comprising: A rotor core (3) comprising a first face and a second face opposite to each other, and a first core passage (31) and a second core passage (32) penetrating through the rotor core (3); The first partition plate (1) and the second partition plate (2) are respectively attached to the first face and the second face, the first core passage (31) communicates the first flow channel (11) and the first flow channel (21), and the second core passage (32) respectively communicates the second flow channel (12) and the second flow channel (22).

13. The rotor assembly (100) of claim 12, characterized by The first core passage (31) is provided with a first magnetic member (311), the first magnetic member (311) divides the first core passage (31) into a first sub-passage (312) and a second sub-passage (313), and the first sub-passage (312) and the second sub-passage (313) both communicate the first flow channel (11) and the first flow channel (21); The second core passage (32) is provided with a second magnetic member (321), the second magnetic member (321) divides the second core passage (32) into a third sub-passage (322) and a fourth sub-passage (323), and the third sub-passage (322) and the fourth sub-passage (323) both communicate the second flow channel (12) and the second flow channel (22).

14. The rotor assembly (100) of claim 13, wherein, The rotor core (3) further comprises a third core passage (33) and a fourth core passage (34) penetrating through the rotor core (3), the third core passage (33) being in communication with the third flow channel (23) and the third flow guide channel (13), and the fourth core passage (34) being in communication with the fourth flow channel (24) and the fourth flow guide channel (14).

15. The rotor assembly (100) of claim 14, wherein, The third core passage (33) is provided with a third magnetic member (331), and the third magnetic member (331) divides the third core passage (33) into a fifth sub-passage (332) and a sixth sub-passage (333), both of which are in communication with the third flow channel (23) and the third flow guide channel. The fourth core passage (34) is provided with a fourth magnetic member (341), and the fourth magnetic member (341) divides the fourth core passage (34) into a seventh sub-passage (342) and an eighth sub-passage (343), both of which are in communication with the fourth flow channel (24) and the fourth flow guide channel.

16. The rotor assembly (100) of claim 15, wherein, The projections of the first core passage (31) and the second core passage (32) on the first partition plate (1) coincide with the projections of the first flow channel (11) and the second flow channel (12) on the first partition plate (1); The projections of the third core passage (33) and the fourth core passage (34) on the second partition plate (2) coincide with the third flow channel (23) and the fourth flow channel (24).

17. The rotor assembly (100) of claim 12, wherein Further comprising: A rotating shaft (4), the first partition plate (1), the rotor core (3), and the second partition plate (2) are sequentially sleeved on the rotating shaft (4), the rotating shaft (4) is provided with a first flow guide hole (42) and a second flow guide hole (43) penetrating through the side wall of the rotating shaft (4), the first flow guide hole (42) is in communication with the first flow channel (111) of the first partition plate (1), and the second flow guide hole (43) is in communication with the third flow channel (231) of the second partition plate (2).

18. The rotor assembly (100) of claim 17, wherein, The rotating shaft (4) further comprises a through hole (41) penetrating through the center of the rotating shaft (4) in a second direction, and the through hole (41) is in communication with the first flow guide hole (42) and the second flow guide hole (43).

19. The rotor assembly (100) of claim 18, wherein, The first partition plate (1) is provided with a first mounting hole (15) penetrating in the second direction, and the second partition plate (2) is provided with a second mounting hole (25) penetrating in the second direction, the first partition plate (1) is sleeved on the rotating shaft (4) through the first mounting hole (15), and the second partition plate (2) is sleeved on the rotating shaft (4) through the second mounting hole (25).

20. An electric machine characterized by The rotor assembly (100) of any one of claims 1-19.

21. A vehicle characterized by The rotor assembly (100) of any one of claims 1-19; or the motor of claim 20.

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