Rotor assembly, motor and automobile

Abstract

The application discloses a rotor assembly, a motor and a car, and relates to the technical field of rotor assemblies. The rotor assembly comprises a rotating shaft and a rotor core, the rotating shaft is provided with a first channel, the rotating shaft is provided with a liquid passage hole in communication with the first channel, the rotor core is sleeved on the outer periphery of the rotating shaft, both end surfaces of the rotor core are provided with rotor end rings, the rotor core is provided with a second channel penetrating through both end surfaces of the rotor core, the second channel is in communication with the liquid passage hole, both end surfaces of the rotor core are provided with liquid guide portions in relief, the liquid guide portions are provided with liquid guide holes in communication with the second channel, and the liquid guide holes are used for guiding the cooling medium to the rotor end rings. The rotor assembly, the motor and the car provided by the application can make the cooling medium be thrown to the rotor end rings through the second channel penetrating through the rotor core and the liquid guide holes arranged on the end surfaces of the rotor core, and the interior of the rotor core and the rotor end rings can be cooled at the same time, so that the cooling effect and the cooling uniformity of the rotor assembly are improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle design technology, and more particularly to a rotor assembly, a motor, and an automobile. Background Technology

[0002] As the power output component of new energy vehicles, the electric motor is one of the most crucial components, especially in pure electric vehicles where it is the sole power source. Its performance, weight, and size directly affect the vehicle's operation. The heat generated during motor operation mainly consists of stator losses and rotor losses. The stator core is in direct contact with the casing, so the heat generated by the stator can be transferred to the casing via thermal conduction and then carried away by thermal convection. However, the air gap between the rotor and stator, along with the motor's sealing characteristics, prevents the heat generated by the rotor from dissipating quickly enough, making the rotor often the hottest part of the entire motor.

[0003] To address the rotor heat dissipation problem, an oil cooling solution was introduced. Related technologies for rotor oil cooling primarily involve introducing oil through the central hole of the shaft, with through-holes on the shaft wall guiding the oil into the core. The oil is then ejected through axial guide holes at the core ends to the end rings, thus cooling the core and end rings. However, under high oil supply pressure, the oil can easily spray directly out axially through the outlet of the axial guide holes, failing to cool the end rings. This can lead to uneven rotor cooling or even localized overheating, affecting the rotor's dynamic performance. Summary of the Invention

[0004] This invention discloses a rotor assembly, a motor, and an automobile, which can simultaneously cool the interior of the rotor core and the rotor end ring without increasing the number of parts in the rotor assembly, thereby improving the cooling effect and cooling uniformity of the rotor assembly.

[0005] To achieve the above objectives, in a first aspect, the present invention discloses a rotor assembly comprising:

[0006] A rotating shaft, wherein the rotating shaft has a first channel passing through both ends of the rotating shaft, and the outer peripheral surface of the rotating shaft is provided with a liquid passage hole communicating with the first channel;

[0007] A rotor core, which is sleeved on the outer circumference of the rotating shaft, and rotor end rings are installed on both ends of the rotor core;

[0008] The rotor core is provided with a second channel penetrating both ends of the rotor core. The second channel is connected to the liquid passage. Both ends of the rotor core are provided with a liquid guiding part. The liquid guiding part is located at the outlet of the second channel and in the inner ring of the rotor end ring.

[0009] As an optional implementation, in an embodiment of the first aspect of the present invention, the second channel includes a first cooling channel and two second cooling channels. The first cooling channel is connected to the liquid passage hole. The two second cooling channels are located at both ends of the first cooling channel along the axial direction of the rotating shaft. The two second cooling channels are connected to the first cooling channel. The second cooling channels are connected to the liquid guide hole, and the two second cooling channels pass through the end face of the rotor core.

[0010] Along the axial direction of the rotating shaft, the two second cooling channels gradually move away from the rotating shaft from the end that is connected to the first cooling channel.

[0011] As an optional implementation, in an embodiment of the first aspect of the present invention, the rotor core includes multiple core segments stacked along the axial direction of the rotating shaft. The multiple core segments include a first core segment and two second core segments. The two second core segments are located at both ends of the first core segment along the axial direction of the rotating shaft, and the rotor end ring is installed on the end face of the two second core segments facing away from the first core segment.

[0012] The first core segment is provided with the first cooling channel, which extends through both ends of the first core segment;

[0013] Both of the second iron core segments are provided with the second cooling channel. The two second cooling channels pass through the two end faces of the corresponding second iron core segments respectively. The two liquid guiding parts are respectively provided on the end faces of the corresponding second iron core segments away from the first iron core segment. The liquid guiding holes of the two liquid guiding parts are respectively connected to the corresponding second cooling channels.

[0014] As an optional implementation, in an embodiment of the first aspect of the present invention, the second core segment includes multiple sub-core segments, which are stacked sequentially along the axial direction of the rotating shaft. Each sub-core segment is provided with a sub-cooling channel penetrating both ends of itself. The sub-cooling channels are sequentially connected to form the second cooling channel. In a first direction, the sub-cooling channels are gradually moved away from the rotating shaft. The sub-core segment closest to the first core segment is the first sub-core segment, and the sub-core segment farthest from the first core segment is the second sub-core segment. The sub-cooling channel of the first sub-core segment is connected to the first cooling channel. The end face of the second sub-core segment is provided with the liquid guiding portion, and the liquid guiding hole is connected to the sub-cooling channel of the second sub-core segment.

[0015] Wherein, the first direction is the stacking direction from the first sub-core segment to the second sub-core segment.

[0016] As an optional implementation, in an embodiment of the first aspect of the present invention, the opening of the first cooling channel is staggered from the opening of the sub-cooling channel of the first sub-core segment, and in the first direction, the openings of any two adjacent sub-cooling channels are staggered.

[0017] As an optional implementation, in an embodiment of the first aspect of the present invention, the cross-section of the first cooling channel intercepted by the first plane includes a first side and a second side. In a direction perpendicular to the axis of rotation, the distance from the second side to the axis of rotation is greater than the distance from the first side to the axis of rotation. The cross-section of each of the sub-cooling channels intercepted by the first plane includes a third side and a fourth side. In a direction perpendicular to the axis of rotation, the distance from the fourth side to the axis of rotation is greater than the distance from the third side to the axis of rotation.

[0018] The third and fourth sides of the sub-cooling channel connected to the first cooling channel are symmetrical about the second side. In any two adjacent sub-cooling channels, the third and fourth sides of the sub-cooling channel away from the first cooling channel are symmetrical about the fourth side of the sub-cooling channel close to the first cooling channel.

[0019] The first plane is the plane that passes through the axis of the rotating shaft.

[0020] As an optional implementation, in an embodiment of the first aspect of the invention, the cross-sectional dimensions of each of the sub-cooling channels are the same when intercepted by a second plane, the second plane being perpendicular to the axial direction of the rotating shaft.

[0021] As an optional implementation, in an embodiment of the first aspect of the present invention, the cross-sectional shape of the sub-cooling channel is elongated, and the length direction of the sub-cooling channel is the same as the radial direction of the sub-core segment.

[0022] As an optional implementation, in an embodiment of the first aspect of the present invention, the cross-sectional shape of the sub-cooling channel is waist-shaped, square, circular, elliptical, or trapezoidal, and the center of the sub-core segment is located on the axis of the cross-section of the sub-cooling channel, or the center of the sub-core segment is located outside the axis of the cross-section of the sub-cooling channel.

[0023] The cross-section of the sub-cooling channel is the cross-section of the sub-cooling channel cut by the second plane, which is perpendicular to the axial direction of the rotating shaft.

[0024] As an optional implementation, in an embodiment of the first aspect of the invention, the lengths of each of the sub-cooling channels are the same in the axial direction of the rotating shaft.

[0025] As an optional implementation, in an embodiment of the first aspect of the present invention, there are multiple liquid passage holes, which are arranged around the axis of the rotating shaft, and each liquid passage hole is connected to the first channel.

[0026] There are multiple second channels, each of which is respectively configured to correspond one-to-one with the liquid passage hole, and each of the second channels is respectively connected to the corresponding liquid passage hole;

[0027] There are multiple liquid guiding parts, each of which is respectively configured to correspond one-to-one with the second channel, and the liquid guiding hole of each liquid guiding part is respectively connected to the corresponding second channel.

[0028] As an optional implementation, in an embodiment of the first aspect of the present invention, a plurality of second channels are evenly arranged along the axis of the rotating shaft, and a plurality of liquid guiding portions are evenly arranged along the axis of the rotating shaft.

[0029] As an optional implementation, in an embodiment of the first aspect of the present invention, the liquid guiding part is disposed at the outlet of the second channel, the liquid guiding hole penetrates both ends of the liquid guiding part, and the liquid outlet direction of the liquid guiding hole is perpendicular to the outlet direction of the second channel.

[0030] As an optional implementation, in an embodiment of the first aspect of the present invention, the liquid outlet direction of the liquid guide hole is the same as the radial direction of the rotor core, or the liquid outlet direction of the liquid guide hole is the same as the circumferential direction of the rotor core.

[0031] As an optional implementation, in the embodiment of the first aspect of the present invention, the liquid guiding hole is a hole of equal diameter, or the liquid guiding hole is a tapered hole, and the diameter of the liquid guiding hole gradually increases along the radial direction of the rotor core.

[0032] In a second aspect, the present invention discloses an electric motor having a rotor assembly as described in the first aspect above.

[0033] Thirdly, the present invention discloses an automobile having a motor as described in the second aspect above.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] The rotor assembly, motor, and automobile provided in this invention feature a second channel penetrating both ends of the rotor core and connected to a first channel on the rotating shaft. This allows cooling medium entering the first channel to flow into the second channel, cooling the interior of the rotor core. Simultaneously, liquid guide holes connected to the second channel are provided on both ends of the rotor core, altering the direction of the cooling medium's ejection and preventing it from spraying directly along the shaft's axis. This allows the cooling medium in the second channel to be thrown through the guide holes to the rotor end ring under centrifugal force, cooling the end ring. Therefore, the rotor assembly of this application can simultaneously cool the interior of the rotor core and the rotor end ring without increasing the number of parts, improving the cooling effect and uniformity of the rotor assembly, and without causing excessive weight to the rotor assembly, thus avoiding negative impacts on the motor's power performance. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the rotor assembly disclosed in an embodiment of the present invention;

[0038] Figure 2 This is an exploded structural diagram of the rotor assembly disclosed in an embodiment of the present invention;

[0039] Figure 3 This is a top view of the rotor assembly disclosed in an embodiment of the present invention;

[0040] Figure 4 yes Figure 3 A cross-sectional view of the rotor assembly along the AA direction;

[0041] Figure 5 yes Figure 3 A cross-sectional view of the rotor assembly along the BB direction;

[0042] Figure 6 yes Figure 3 Another cross-sectional view of the rotor assembly along the BB direction;

[0043] Figure 7 yes Figure 6 A magnified view of point N in the image;

[0044] Figure 8 This is a schematic diagram of the sub-core segment disclosed in an embodiment of the present invention;

[0045] Figure 9a This is a schematic diagram of the structure of a sub-core segment with a liquid guiding hole disclosed in an embodiment of the present invention;

[0046] Figure 9b This is a schematic diagram of the structure of a sub-core segment with another type of liquid guiding hole disclosed in an embodiment of the present invention;

[0047] Figure 10 This is a schematic diagram of the structure of the motor disclosed in an embodiment of the present invention;

[0048] Figure 11 This is a schematic diagram of the structure of a car disclosed in an embodiment of the present invention.

[0049] Icons: 100, Rotor assembly; 1, Shaft; 11, First channel; 12, Fluid passage; 2, Rotor core; 2a, First core segment; 2b, Second core segment; 2c, Sub-core segment; 21, Second channel; 22, Fluid guide section; 221, Fluid guide hole; 23, First cooling channel; 231, First side; 232, Second side; 24a, Second cooling channel; 24, Sub-cooling channel; 241, Third side; 242, Fourth side; 2d, Mounting slot; 3, Rotor end ring; 200, Motor; 300, Automobile. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0052] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0053] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0054] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0055] In related technologies, oil cooling solutions have been introduced to address rotor heat dissipation issues. These solutions typically involve oil intake through the central hole of the shaft, with through-holes on the shaft wall guiding the oil into the core. Radial guide plates then direct the oil to axial guide holes at the core ends, finally ejecting it onto the end rings for cooling both the core and end rings. However, the addition of radial guide plates increases the number of rotor components, hindering quality control and negatively impacting motor performance. Furthermore, the axial guide holes typically lack guiding structures at their outlets, allowing oil to spray directly axially under high supply pressure, failing to cool the end rings and leading to uneven rotor cooling or even localized overheating, thus affecting rotor performance.

[0056] Based on this, this application discloses a rotor assembly that can simultaneously cool the interior of the rotor core and the rotor end rings without increasing the number of parts in the rotor assembly, thereby improving the cooling effect and cooling uniformity of the rotor assembly. The technical solution of the present invention will be further described below with reference to embodiments and accompanying drawings.

[0057] Please see Figures 1 to 4This invention discloses a rotor assembly 100, which can be applied to an automobile motor to drive the vehicle. Specifically, the rotor assembly 100 includes a shaft 1 and a rotor core 2. The shaft 1 has a first channel 11 penetrating both ends of the shaft 1, which can be used to introduce a cooling medium. The shaft 1 also has a liquid passage hole 12 communicating with the first channel 11. The rotor core 2 is sleeved on the outer periphery of the shaft 1. Rotor end rings 3 are installed on both ends of the rotor core 2. The rotor end rings 3 surround the outer periphery of the shaft 1 and are spaced apart from the shaft 1. The rotor core 2 has a second channel 21 penetrating both ends of the rotor core 2. The second channel 21 communicates with the liquid passage hole 12 of the shaft 1, so that the cooling medium can enter the second channel 21 from the liquid passage hole 12 of the shaft 1 to cool the interior of the rotor core 2. Both ends of the rotor core 2 are provided with liquid guiding parts 22. The liquid guiding parts 22 are located at the outlet of the second channel 21 and in the inner ring of the rotor end ring 3. The liquid guiding parts 22 are provided with liquid guiding holes 221 that communicate with the second channel 21. The liquid guiding holes 221 are used to guide the cooling medium to the rotor end ring 3 to cool the rotor end ring 3.

[0058] In the rotor assembly 100 provided in this application, a second channel 21 is provided on the rotor core 2, penetrating both ends of the rotor core 2, and the second channel 21 is connected to the first channel 11 of the rotating shaft 1. This allows the cooling medium entering the first channel 11 to flow into the second channel 21 to cool and dissipate heat inside the rotor core 2. At the same time, since liquid guiding parts 22 are provided on both ends of the rotor core 2, and the liquid guiding parts 22 are provided with liquid guiding holes 221 that communicate with the second channel 21, the liquid guiding holes 221 of the liquid guiding parts 22 are used to change the direction of the cooling medium thrown out of the second channel 21, preventing the cooling medium from being sprayed out directly along the axial direction of the rotating shaft 1. As a result, the cooling medium in the second channel 21 can be thrown to the rotor end ring 3 through the liquid guiding holes 221 under the action of centrifugal force, so as to cool and lower the temperature of the rotor end ring 3. As can be seen, by setting a second channel 21 inside the rotor core 2 and setting a liquid passage hole 12 on the outer circumferential surface of the rotating shaft 1, the second channel 21 can be connected to the first channel 11 through the liquid passage hole 12, so that the cooling medium in the first channel 11 can be introduced into the interior of the rotor core 2 without the need for other parts. That is, by using the rotor assembly 100 of this application, the interior of the rotor core 2 and the rotor end ring 3 can be cooled and cooled simultaneously without increasing the number of parts of the rotor assembly 100, thereby improving the cooling effect and cooling uniformity of the rotor assembly 100 and avoiding uneven cooling or even local overheating of the rotor assembly 100; and it will not cause the overall weight of the rotor assembly 100 to be too heavy, so as to avoid negative impact on the power performance of the motor.

[0059] Specifically, the cooling medium mentioned above may include, but is not limited to, cooling oil or cooling water. The cooling medium enters the first channel 11 through the inlet at one end of the rotating shaft 1, first cooling the rotating shaft 1, and then flows to the other end of the rotating shaft 1. It can then enter the second channel 21 through the liquid passage hole 12 on the rotating shaft 1 to cool the interior of the rotor core 2. Since a liquid guiding part 22 with a liquid guiding hole 221 is provided on the end face of the rotor core 2, and the liquid guiding hole 221 is connected to the second channel 21, the cooling medium passing through the second channel 21 can enter the liquid guiding hole 221 of the liquid guiding part 22 through the outlet of the second channel 21. Thus, under the rotation of the rotating shaft 1 and the rotor core 2, the cooling medium can be subjected to centrifugal force and thrown out through the liquid guiding hole 221 to the rotor end ring 3, thereby achieving the cooling of the rotor end ring 3.

[0060] It is understood that, in addition to the aforementioned shaft 1, rotor core 2 and rotor end ring 3, rotor assembly 100 may also include rotor winding (not shown), which may be installed in the mounting slot 2d of rotor core 2.

[0061] In some embodiments, combined with Figure 3 and Figure 4 As shown, the liquid passage hole 12 of the rotating shaft 1 can be multiple, for example in... Figure 4 In the illustrated embodiment, there may be eight liquid passage holes 12, arranged around the axis O of the rotating shaft 1, and each liquid passage hole 12 is connected to the first channel 11. Correspondingly, there may also be multiple second channels 21, for example in... Figure 4 In the illustrated embodiment, there may be eight second channels 21, each corresponding to a liquid passage 12 and connected to the corresponding liquid passage 12. This allows the cooling medium in the first channel 11 to enter the corresponding second channel 21 through the corresponding liquid passage 12, thereby cooling the interior of the rotor core 2. By providing multiple second channels 21, the contact area between the cooling medium and the rotor core 2 can be effectively increased, allowing the cooling medium to make more thorough contact with the rotor core 2. This reduces the contact thermal resistance between the cooling medium and the rotor core 2, and improves the heat dissipation efficiency of the rotor core 2.

[0062] Furthermore, multiple liquid passage holes 12 can be evenly arranged along the axis O of the rotating shaft 1, and multiple second channels 21 can be evenly arranged along the axis O of the rotating shaft 1, thereby enabling better balanced cooling of the rotor core 2 and improving cooling uniformity.

[0063] In some embodiments, combined with Figure 3 and Figure 5As shown, the second channel 21 may include a first cooling channel 23 and two second cooling channels 24a. The first cooling channel 23 is connected to the liquid passage 12 of the rotating shaft 1. The two second cooling channels 24a are located at both ends of the first cooling channel 23 along the axial direction of the rotating shaft 1. The two second cooling channels 24a are connected to the first cooling channel 23, and the two second cooling channels 24a pass through the corresponding end face of the rotor core 2. That is, one second cooling channel 24a passes through one end face of the rotor core 2, and the other second cooling channel 24a passes through the other end face of the rotor core 2. Along the axial direction of the rotating shaft 1, each of the second cooling channels 24a gradually moves away from the rotating shaft 1 from the end connected to the first cooling channel 23, so that the outlet of the second channel 21 can move away from the rotating shaft 1 and closer to the rotor end ring 3. That is, the liquid guiding hole 221 of the liquid guiding part 22 can be set away from the rotating shaft 1 and closer to the rotor end ring 3. This not only allows the cooling medium flowing to the liquid guiding hole 221 to be subjected to a large centrifugal force, but also reduces the distance between the liquid guiding hole 221 and the rotor end ring 3, so as to ensure that the cooling medium can be thrown to the rotor end ring 3 through the liquid guiding hole 221, thus ensuring the cooling effect.

[0064] It is understood that the first cooling channel 23 can be a horizontal channel and / or an inclined channel, and the inclination direction is along the axis away from the rotating shaft 1. That is, the first cooling channel 23 can be entirely a horizontal channel or an inclined channel, or partially a horizontal channel and partially an inclined channel. Correspondingly, the second cooling channel 24a can also be a horizontal channel and / or an inclined channel, and the inclination direction of the second cooling channel 24a is also along the axis away from the rotating shaft 1. That is, the second cooling channel 24a can be entirely a horizontal channel or an inclined channel, or partially a horizontal channel and partially an inclined channel.

[0065] It is worth noting that since the two second cooling channels 24a are located at the two ends of the first cooling channel 23, the two second cooling channels 24a can be arranged symmetrically relative to the first cooling channel 23.

[0066] Furthermore, combined Figure 3 and Figure 6 As shown, the rotor core 2 may include multiple core segments, which are stacked and sleeved on the rotating shaft 1 along the axial direction. The multiple core segments may include a first core segment 2a and two second core segments 2b, located at opposite ends of the first core segment 2a. For a clearer description of the positional relationship between the first core segment 2a and the two second core segments, please refer to... Figure 6 As shown, the first core segment 2a is defined as follows: Figure 6 The side to the left shown is the left end of the first iron core segment 2a. The first iron core segment 2a is as follows... Figure 6The side facing right is the right end of the first core segment 2a. The two second core segments 2b are located at the left and right ends of the first core segment 2a, respectively. That is, one second core segment 2b is located at the left end of the first core segment 2a, and the other second core segment 2b is located at the right end of the first core segment 2a. However, it should be understood that the above orientation and definition are merely examples for ease of description and understanding, and do not limit the scope of protection of this embodiment.

[0067] Specifically, the first iron core segment 2a is provided with the aforementioned first cooling channel 23, which penetrates both ends of the first iron core segment 2a; the two second iron core segments 2b are equipped with the aforementioned rotor end ring 3 on their ends facing away from the first iron core segment 2a, and both second iron core segments 2b are provided with the aforementioned second cooling channel 24a. The two second cooling channels 24a penetrate both ends of the corresponding second iron core segments 2b, and the two ends of the two second iron core segments 2b facing away from the first iron core segment 2a are provided with the aforementioned liquid guiding part 22. That is, the two liquid guiding parts 22 are respectively provided on the ends of the corresponding second iron core segments 2b facing away from the first iron core segment 2c, and the liquid guiding holes 221 of the two liquid guiding parts 22 are respectively connected to the corresponding second cooling channel 24a.

[0068] By using different sections of the iron core to form the first cooling channel 23 and the second cooling channel 24a respectively, it is possible to make the outlet of the second channel 21 away from the rotating shaft 1 and close to the rotor end ring 3, while ensuring that the length of the second cooling channel 24a is consistent at all points in the direction perpendicular to the axis of the rotating shaft 1, which facilitates the processing and formation of the second cooling channel 24a.

[0069] In this application, the two second core segments 2b have roughly the same shape and structure, but the shape or structure of the two second core segments 2b can be adapted to meet actual needs. For example, the two second core segments 2b have roughly the same shape and structure, so the specific structure of the two second core segments 2b will be described below using any one of the second core segments 2b as an example.

[0070] Specifically, in combination Figure 3 and Figure 6As shown, each of the second core segments 2b may include multiple sub-core segments 2c. These sub-core segments 2c are stacked sequentially along the axis of the rotating shaft 1. Each sub-core segment 2c has a sub-cooling channel 24 penetrating both ends. These sub-cooling channels 24 are sequentially connected to form the aforementioned second cooling channel 24a. In the first direction, each sub-cooling channel 24 is gradually moved away from the rotating shaft 1 to form a stepped cooling channel within the second core segment 2b. The sub-core segment 2c closest to the first core segment 2a is the first sub-core segment, and the sub-core segment 2c farthest from the first core segment 2a is the second sub-core segment. The sub-cooling channel of the first sub-core segment... Cooling channel 24 is connected to the first cooling channel 23. The end face of the second sub-core segment is provided with the aforementioned liquid guiding portion 22. This liquid guiding portion 22 is located at the outlet of the sub-cooling channel 24 of the second sub-core segment, and the liquid guiding hole 221 of the liquid guiding portion 22 is connected to the sub-cooling channel 24 of the second sub-core segment. This allows the liquid guiding hole 221 of the liquid guiding portion 22 to be positioned further away from the rotating shaft 1 and closer to the inner ring surface of the rotor end ring 3. This increases the centrifugal force on the cooling medium within the liquid guiding hole 221 and reduces the distance between the liquid guiding hole 221 and the rotor end ring 3, ensuring that the cooling medium can be thrown out through the outlet of the liquid guiding hole 221 to the rotor end ring 3, cooling the rotor end ring 3 and improving the cooling effect. The first direction is the direction from the first sub-core segment to the second sub-core segment, for example... Figure 6 The left and right directions; each sub-core segment 2c can include multiple axially stacked core laminations.

[0071] In other words, by forming a second channel 21 in an approximately stepped shape inside the rotor core 2, the outlet of the second channel 21 can be far away from the rotating shaft 1 and close to the rotor end ring 3. That is, the liquid guide hole 221 can be set far away from the rotating shaft 1 and close to the rotor end ring 3, so that the liquid guide hole 221 has a large centrifugal force, forming a centrifugal pump effect. This allows the cooling medium flowing to the liquid guide hole 221 to be subjected to a large centrifugal force, ensuring that the cooling medium can be thrown to the rotor end ring 3 through the liquid guide hole 221. This avoids the situation where the centrifugal force of a single radial liquid channel is insufficient to throw the cooling medium to the rotor end ring 3, thus ensuring the cooling effect. In other words, by forming a second channel 21 in an approximately stepped shape, not only can the cooling medium be introduced through the second channel 21 to cool the inside of the rotor core 2, but the centrifugal pump effect generated by the rotation of the rotor assembly 100 can also be fully utilized to pressurize the cooling medium, which can effectively improve the cooling effect of the cooling medium on the rotor end ring 3.

[0072] In some embodiments, in the axial direction of the rotating shaft 1, for example in Figure 6In the left-right direction, the thickness of each sub-core segment 2c is the same, and therefore the length of each sub-cooling channel 24 is the same. This ensures the uniformity of the cooling medium being thrown out to the rotor end ring 3, improving the cooling effect. Furthermore, the number of sub-core segments 2c in the two second core segments 2b can be the same, for example, in... Figure 6 In the illustrated embodiment, each of the two second core segments 2b has five sub-core segments 2c. By using two second core segments 2b comprising an equal number of sub-core segments 2c, the cooling medium flows along an equal-length path before being thrown to the corresponding rotor end ring 3 through the corresponding liquid guide holes 221. This allows for better balanced cooling of the two rotor end rings 3, ensuring that the cooling effect of the cooling medium on the two rotor end rings 3 remains consistent. Consequently, the temperatures of the two rotor end rings 3 remain consistent, preventing uneven heating of the rotor assembly 100 and improving the cooling uniformity of the rotor assembly 100.

[0073] In some embodiments, the cross-sectional dimensions of each sub-cooling channel 24 intercepted by the second plane are identical, and the second plane is perpendicular to the axis of the rotating shaft 1. This is mainly because the size of the cross-sectional area of ​​the sub-cooling channel 24 intercepted by the second plane affects the structural strength of the sub-core segment 2c and the flow rate of the cooling medium. If the cross-sectional area of ​​the sub-cooling channel 24 intercepted by the second plane is too large, it will reduce the strength of the sub-core segment 2c and may pose a safety problem. If the cross-sectional area of ​​the sub-cooling channel 24 intercepted by the second plane is too small, it will reduce the flow rate of the cooling medium and affect the cooling effect. Therefore, sub-cooling channels 24 with identical cross-sectional dimensions are provided in each sub-core segment 2c to avoid the cross-sectional dimensions of the sub-cooling channel 24 on a certain sub-core segment 2c being too large, which would affect the structural strength of that sub-core segment 2c and ensure high reliability, so that each sub-core segment 2c can be used normally. At the same time, it also avoids the cross-sectional dimensions of the sub-cooling channel 24 on a certain sub-core segment 2c being too small, which would affect the flow rate of the cooling medium and ensure the cooling effect.

[0074] In some embodiments, the opening of the first cooling channel 23 is staggered from the opening of the sub-cooling channel 24 of the first sub-core segment. In the first direction, the openings of any two adjacent sub-cooling channels 24 are staggered so that each sub-cooling channel 24 can gradually move away from the rotating shaft 1. This allows the outlet of the second channel 21 to move away from the rotating shaft 1 and closer to the rotor end ring 3. That is, the liquid guiding hole 221 of the liquid guiding part 22 can be moved away from the rotating shaft 1 and closer to the inner ring surface of the rotor end ring 3, increasing the centrifugal force on the cooling medium in the liquid guiding hole 221. At the same time, it can also reduce the distance between the liquid guiding hole 221 and the rotor end ring 3, ensuring that the cooling medium can be thrown out to the rotor end ring 3 through the outlet of the liquid guiding hole 221, cooling the rotor end ring 3 and improving the cooling effect.

[0075] Furthermore, the portion of the opening of the first cooling channel 23 that is offset from the opening of the sub-cooling channel 24 of the first sub-core segment can be one-third, one-half, two-thirds, or three-quarters of the opening area of ​​the sub-cooling channel 24 of the first sub-core segment, etc. Similarly, the portion of the openings of any two adjacent sub-cooling channels 24 that are offset can also be one-third, one-half, two-thirds, or three-quarters of the opening area of ​​the sub-cooling channel 24 of the first sub-core segment, etc.

[0076] Furthermore, combined Figure 6 and Figure 7 As shown, the cross-section of the first cooling channel 23, obtained by the first plane, includes a first side 231 and a second side 232. In the direction perpendicular to the axis O of the rotating shaft 1, for example, in... Figure 7 In the vertical direction, the distance d2 from the second side 232 to the axis O of the rotating shaft 1 is greater than the distance d2 from the first side 231 to the axis O of the rotating shaft 1, that is, the first side 231 is closer to the rotating shaft 1 than the second side 232; the cross-section of each sub-cooling channel 24 intercepted by the first plane includes the third side 241 and the fourth side 243, in the direction perpendicular to the axis O of the rotating shaft 1, for example, in Figure 7 In the vertical direction, the distance d4 from the fourth side 242 to the axis O of the rotating shaft 1 is greater than the distance d3 from the third side 241 to the axis O of the rotating shaft 1, that is, the third side is closer to the rotating shaft 1 than the fourth side.

[0077] The third side 241 and the fourth side 242 of the sub-cooling channel 24, which communicates with the first cooling channel 23, are symmetrical about the second side 232 in the first direction, for example, in Figure 7In the left-right direction, in any two adjacent sub-cooling channels 24, the third side 241 and the fourth side 242 of the sub-cooling channel 24 away from the first cooling channel 23 are symmetrical about the fourth side 242 of the sub-cooling channel 24 close to the first cooling channel 23, such that the portion of the opening of the first cooling channel 23 that is offset from the opening of the sub-cooling channel 24 of the first sub-core segment is half the opening area of ​​the sub-cooling channel 24 of the first sub-core segment, and the portion of the openings of any two adjacent sub-cooling channels 24 that are offset is also half the opening area of ​​the sub-cooling channel 24 of the first sub-core segment. That is, the portion of the opening of the first cooling channel 23 and the opening of the sub-cooling channel 24 of the first sub-core segment that are connected is equal to half the opening area of ​​the sub-cooling channel 24 of the first sub-core segment, and the portion of the openings of any two adjacent sub-cooling channels 24 that are connected is also equal to half the opening area of ​​the sub-cooling channel 24 of the first sub-core segment. In other words, the first cooling channel 23 and the sub-cooling channel 24 are connected through half an opening of the sub-cooling channel 24, and any two adjacent sub-cooling channels 24 are also connected through half an opening of the sub-cooling channel 24, wherein the first plane passes through the axis O of the rotating shaft 1.

[0078] This is mainly because the cross-sectional dimensions of each sub-cooling channel 24 intercepted by the second plane are the same. That is, in the first direction, the distance from the fourth side 242 to the corresponding third side 241 of each sub-cooling channel 24 is equal, and in the first direction, the distance from the second side 232 to the first side 231 is equal to the distance from any fourth side 242 to the corresponding third side 241. If the portion connecting the opening of the first cooling channel 23 and the opening of the sub-cooling channel 24 of the first sub-core segment is less than half the opening area of ​​the sub-cooling channel 24 of the first sub-core segment, and the portion connecting the openings of any two adjacent sub-cooling channels 24 is less than half the opening area of ​​the sub-cooling channel 24 of the first sub-core segment, the flow rate of the cooling medium will be too slow. If the cooling medium stays in the first cooling channel 23 and each of the sub-cooling channels 24 for a long time, the temperature of the cooling medium will rise to a relatively high temperature and remain in the first cooling channel 23 and each of the sub-cooling channels 24, resulting in poor cooling effect. If the portion connecting the opening of the first cooling channel 23 and the opening of the sub-cooling channel 24 of the first sub-core segment is greater than half the opening area of ​​the sub-cooling channel 24 of the first sub-core segment, and the portion connecting the openings of any two adjacent sub-cooling channels 24 is greater than half the opening area of ​​the sub-cooling channel 24 of the first sub-core segment, the flow rate of the cooling medium will be too fast. As a result, the cooling medium will flow out to the outside of the rotor core 2 before fully cooling the inside of the rotor core 2, resulting in insufficient cooling and poor cooling effect. Therefore, by controlling the size of the portion connecting the opening of the first cooling channel 23 and the opening of the sub-cooling channel 24 of the first sub-core segment to be half the opening area of ​​the sub-cooling channel 24 of the first sub-core segment, and by controlling the size of the portion connecting the openings of any two adjacent sub-cooling channels 24 to be half the opening area of ​​the sub-cooling channel 24 of the first sub-core segment, it is beneficial to control the flow rate of the cooling medium in each sub-cooling channel 24 within a suitable range to ensure the cooling effect.

[0079] It is understandable that the first cooling channel 23 and each of the sub-cooling channels 24 mentioned above are all horizontal channels, that is, in Figure 6 and Figure 7 In the illustrated embodiment, the first side 231 and the second side are both parallel to the axis O of the rotating shaft 1, and the third side and the fourth side are both parallel to the axis O of the rotating shaft 1.

[0080] In some embodiments, the cross-sectional shape of the sub-cooling channel 24 can be oblong, square, circular, elliptical, or trapezoidal. The cross-section of the sub-cooling channel 24 is the cross-section obtained by the second plane, which is perpendicular to the axis of rotation 1. Therefore, the shape of the cross-section of the sub-cooling channel 24 is not limited to a specific shape; that is, the requirements for the shape of the cross-section of the sub-cooling channel 24 are not high, making it widely applicable and convenient for processing to form the sub-cooling channel 24.

[0081] Preferably, such as Figure 8 As shown, the cross-sectional shape of the sub-cooling channel 24 can be elongated, such as waist-shaped, and the length direction of the sub-cooling channel 24 is the same as the radial direction of the sub-core segment 2c. Compared to a square cross-section, the waist-shaped cross-section of the sub-cooling channel 24 avoids sharp corners, thus preventing stress concentration and improving the service life of the sub-core segment 2c. It also ensures sufficient space for liquid guidance, facilitating the flow of the cooling medium and improving the cooling effect.

[0082] Furthermore, such as Figure 8 As shown in (a), the center M of the sub-core segment 2c can be located on the axis a of the cross-section of the sub-cooling channel 24, that is, the axis a of the cross-section of the sub-cooling channel 24 can pass through the center M of the sub-core segment 2c; or, as shown in (a), Figure 8 As shown in (b), the center M of the sub-core segment 2c can be located outside the axis a of the cross-section of the sub-cooling channel 24, that is, the axis a of the cross-section of the sub-cooling channel 24 may not pass through the center M of the sub-core segment 2c. Therefore, the axis a of the cross-section of the sub-cooling channel 24 may or may not pass through the center M of the sub-core segment 2c, and the specific setting can be selected according to the actual situation.

[0083] Among them, the axis a of the cross-section of the sub-cooling channel 24 is perpendicular to the axis of the rotating shaft 1.

[0084] In some embodiments, such as Figure 9a As shown, in some embodiments, the liquid guiding portion 22 may be a protruding strip-shaped structure on the rotor core 2, and the liquid guiding portion 22 and the rotor core 2 may be integrally formed or separately disposed. Specifically, considering that the liquid guiding hole 221 is used to connect to the outlet of the second channel 21 so that the cooling medium passing through the outlet of the second channel 21 can flow into the liquid guiding hole 221, based on this, in order to prevent the cooling medium from being directly thrown out from the outlet of the second channel 21, the liquid guiding portion 22 should completely cover the outlet of the second channel 21. That is, the projection of the liquid guiding portion 22 on the end face of the rotor core 2 should completely cover the outlet of the second channel 21.

[0085] Specifically, the liquid guide hole 221 may have a liquid inlet that penetrates the outer peripheral surface of the liquid guide portion 22. The liquid inlet completely covers the outlet of the second channel 21. That is, the projection of the liquid inlet on the end face of the rotor core 2 should completely cover the outlet of the second channel 21 so that the liquid guide hole 221 can communicate with the second channel 21. Thus, the cooling medium in the second channel 21 can enter the liquid guide hole 221 in sequence through the outlet of the second channel 21 and the liquid inlet of the liquid guide hole 221, and then be thrown out to the rotor end ring 3 through the liquid guide hole 221. Since the liquid guide hole 221 penetrates both ends of the liquid guide section 22, the liquid outlet direction of the liquid guide hole 221 is perpendicular to the outlet direction of the second channel 21. This can change the direction in which the cooling medium is thrown out, so as to avoid the cooling medium being directly thrown out along the axis of the rotating shaft 1 through the outlet of the second channel 21. This ensures that the cooling medium of the second channel 21 can be thrown to the rotor end ring 3 through the liquid guide hole 221 under the action of centrifugal force, so as to cool down the rotor end ring 3.

[0086] Furthermore, the liquid guiding part 22 can be an elongated convex strip, and the liquid guiding hole can also be an elongated hole. As mentioned above, when there are multiple second channels 21, there are also multiple liquid guiding parts 22, with each liquid guiding part 22 corresponding to each second channel 21. Specifically, multiple liquid guiding parts 22 can be evenly arranged along the axis O of the rotating shaft 1, and multiple liquid guiding holes 221 can be evenly arranged along the axis O of the rotating shaft 1. This allows for better balanced cooling of the rotor end ring 3 and improves cooling uniformity.

[0087] For example, when there are eight second channels 21, there can also be eight liquid guiding sections 22. Each of the eight liquid guiding sections 22 is respectively configured in a one-to-one correspondence with a second channel 21, and the liquid guiding hole 221 of each liquid guiding section 22 communicates with the corresponding second channel 21. This allows the cooling medium within the multiple second channels 21 to be thrown to various positions on the rotor end ring 3 through the corresponding liquid guiding hole 221, thereby cooling the rotor end ring 3. By providing multiple liquid guiding holes 221, the contact area between the cooling medium and the rotor end ring 3 can be effectively increased, allowing the cooling medium to contact the rotor end ring 3 more fully, thereby reducing the contact thermal resistance between the cooling medium and the rotor end ring 3 and improving the heat dissipation efficiency of the rotor end ring 3.

[0088] In some embodiments, such as Figure 9a As shown, the opening direction of the liquid outlet of the liquid guide hole 221 can be the same as the radial direction of the rotor core 2. That is, the liquid outlet of the liquid guide hole 221 can be set towards the inner ring surface of the rotor end ring 3. In this way, the cooling medium can be sprayed directly onto the inner ring surface of the rotor end ring 3 to cool the rotor end ring 3 and improve the cooling efficiency.

[0089] In other embodiments, such as Figure 9bAs shown, the opening direction of the liquid outlet of the liquid guide hole 221 can also be the same as the circumferential direction of the rotor core 2.

[0090] In some embodiments, such as Figure 9a and Figure 9b As shown, the liquid guiding hole 221 can be a hole of equal diameter; or, in other embodiments, the liquid guiding hole 221 can also be a conical hole, and the diameter of the liquid guiding hole 221 can gradually increase along the radial direction of the rotor core 2 or along the circumferential direction of the rotor core 2 to form a trumpet hole. In this way, the liquid guiding hole 221 can have a larger liquid outlet, increase the liquid throwing range of the cooling medium, and thus enable the cooling medium to fully contact the rotor end ring 3 and improve the cooling effect.

[0091] Please see Figure 10 This invention also discloses a motor 200 having the rotor assembly 100 described in the above embodiments. The specific implementation structure of the rotor assembly 100 can be referred to in the above embodiments. Since the motor in this embodiment adopts all embodiments of the rotor assembly 100, it possesses at least all the beneficial effects of the above embodiments. As the above technical effects have been described in detail in the embodiments of the rotor assembly 100, they will not be repeated here. It is understood that the motor having the rotor assembly 100 can introduce the cooling medium into the rotor core by opening the second channel inside the rotor core without requiring other parts. That is, the rotor assembly 100 in this application can simultaneously cool the inside of the rotor core and the rotor end ring without increasing the number of parts, improving the cooling effect and uniformity of the rotor assembly 100, thus avoiding uneven cooling or even local overheating of the rotor assembly 100; and it will not cause the overall weight of the rotor assembly 100 to be too heavy, thus avoiding negative impacts on the power performance of the motor 200.

[0092] Please see Figure 11This invention also discloses an automobile, 300, which has the motor 200 described in the above embodiments. The automobile 300 can be a pure electric vehicle or other forms of new energy vehicle; however, in this invention, the automobile is not limited to these. It is understood that the automobile 300 with the motor 200 also possesses all the technical effects of the rotor assembly 100. That is, the automobile 300 can simultaneously cool the interior of the rotor core and the rotor end rings without increasing the number of parts in the rotor assembly 100, improving the cooling effect and uniformity of the rotor assembly 100, thus avoiding uneven cooling or even localized overheating; and it will not cause the overall weight of the rotor assembly 100 to be excessive, thus avoiding negative impacts on the power performance of the motor 200. Since the above technical effects have been described in detail in the embodiments of the rotor assembly 100, they will not be repeated here.

[0093] The present invention has provided a detailed description of a rotor assembly, motor, and automobile according to embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the rotor assembly, motor, and automobile of the present invention and their core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A rotor assembly, characterized in that, include: A rotating shaft, wherein the rotating shaft has a first channel passing through both ends of the rotating shaft, and the outer peripheral surface of the rotating shaft is provided with a liquid passage hole communicating with the first channel; as well as A rotor core, which is sleeved on the outer circumference of the rotating shaft, and rotor end rings are installed on both ends of the rotor core; The rotor core is provided with a second channel penetrating both ends of the rotor core. The second channel is connected to the liquid passage hole. Both ends of the rotor core are provided with a liquid guiding part. The liquid guiding part is located at the outlet of the second channel and in the inner ring of the rotor end ring. The liquid guiding part is provided with a liquid guiding hole connected to the second channel. The second channel includes a first cooling channel and two second cooling channels. The first cooling channel is connected to the liquid passage hole. The two second cooling channels are located at both ends of the first cooling channel along the axial direction of the rotating shaft. The two second cooling channels are connected to the first cooling channel. The second cooling channels are connected to the liquid guide hole, and the two second cooling channels pass through the end face of the rotor core. Along the axial direction of the rotating shaft, the two second cooling channels gradually move away from the rotating shaft from the end that is connected to the first cooling channel.

2. The rotor assembly according to claim 1, characterized in that, The rotor core includes multiple core segments stacked along the axial direction of the rotating shaft. The multiple core segments include a first core segment and two second core segments. The two second core segments are located at both ends of the first core segment along the axial direction of the rotating shaft, and the rotor end rings are installed on the end faces of the two second core segments facing away from the first core segment. The first core segment is provided with the first cooling channel, which extends through both ends of the first core segment; Both of the second iron core segments are provided with the second cooling channel. The two second cooling channels pass through the two end faces of the corresponding second iron core segments respectively. The two liquid guiding parts are respectively provided on the end faces of the corresponding second iron core segments away from the first iron core segment. The liquid guiding holes of the two liquid guiding parts are respectively connected to the corresponding second cooling channels.

3. The rotor assembly according to claim 2, characterized in that, Each second core segment includes multiple sub-core segments, which are stacked sequentially along the axis of the rotating shaft. Each sub-core segment is provided with a sub-cooling channel penetrating both ends of itself. The sub-cooling channels are sequentially connected to form the second cooling channel. In a first direction, the sub-cooling channels are gradually moved away from the rotating shaft. The sub-core segment closest to the first core segment is the first sub-core segment, and the sub-core segment farthest from the first core segment is the second sub-core segment. The sub-cooling channel of the first sub-core segment is connected to the first cooling channel. The liquid guiding part is located at the outlet of the sub-cooling channel of the second sub-core segment, and the liquid guiding hole is connected to the sub-cooling channel of the second sub-core segment. Wherein, the first direction is the stacking direction from the first sub-core segment to the second sub-core segment.

4. The rotor assembly according to claim 3, characterized in that, The opening of the first cooling channel is staggered from the opening of the sub-cooling channel of the first sub-core segment, and in the first direction, the openings of any two adjacent sub-cooling channels are staggered.

5. The rotor assembly according to claim 4, characterized in that, The cross-section of the first cooling channel cut by the first plane includes a first side and a second side. In the direction perpendicular to the axis of rotation, the distance from the second side to the axis of rotation is greater than the distance from the first side to the axis of rotation. The cross-section of each of the sub-cooling channels cut by the first plane includes a third side and a fourth side. In the direction perpendicular to the axis of rotation, the distance from the fourth side to the axis of rotation is greater than the distance from the third side to the axis of rotation. The third and fourth sides of the sub-cooling channel connected to the first cooling channel are symmetrical about the second side. In the first direction, in any two adjacent sub-cooling channels, the third and fourth sides of the sub-cooling channel away from the first cooling channel are symmetrical about the fourth side of the sub-cooling channel close to the first cooling channel. The first plane is the plane that passes through the axis of the rotating shaft.

6. The rotor assembly according to claim 3, characterized in that, Each of the sub-cooling channels has the same cross-sectional dimension when cut by the second plane, which is perpendicular to the axis of the rotating shaft.

7. The rotor assembly according to claim 3, characterized in that, The cross-sectional shape of the sub-cooling channel is elongated, and the length direction of the sub-cooling channel is the same as the radial direction of the sub-core segment.

8. The rotor assembly according to claim 3, characterized in that, The cross-sectional shape of the sub-cooling channel is waist-shaped, square, circular, elliptical, or trapezoidal. The center of the sub-core segment is located on the axis of the cross-section of the sub-cooling channel, or the center of the sub-core segment is located outside the axis of the cross-section of the sub-cooling channel. The cross-section of the sub-cooling channel is the cross-section of the sub-cooling channel cut by the second plane, which is perpendicular to the axial direction of the rotating shaft.

9. The rotor assembly according to claim 3, characterized in that, In the axial direction of the rotating shaft, each of the sub-cooling channels has the same length.

10. The rotor assembly according to any one of claims 1-9, characterized in that, There are multiple liquid passage holes, which are arranged around the axis of the rotating shaft, and each liquid passage hole is connected to the first channel. There are multiple second channels, each of which is respectively configured to correspond one-to-one with the liquid passage hole, and each of the second channels is respectively connected to the corresponding liquid passage hole; There are multiple liquid guiding parts, each of which is respectively configured to correspond one-to-one with the second channel, and the liquid guiding hole of each liquid guiding part is respectively connected to the corresponding second channel.

11. The rotor assembly according to claim 10, characterized in that, Multiple second channels are evenly arranged along the axis of the rotating shaft, and multiple liquid guiding parts are evenly arranged along the axis of the rotating shaft.

12. The rotor assembly according to any one of claims 1-9, characterized in that, The liquid guiding part is installed at the outlet of the second channel, the liquid guiding hole penetrates both ends of the liquid guiding part, and the liquid outlet direction of the liquid guiding hole is perpendicular to the outlet direction of the second channel.

13. The rotor assembly according to any one of claims 1-9, characterized in that, The liquid outlet direction of the liquid guide hole is the same as the radial direction of the rotor core, or the liquid outlet direction of the liquid guide hole is the same as the circumferential direction of the rotor core.

14. The rotor assembly according to claim 13, characterized in that, The liquid guiding hole is a hole of equal diameter, or the liquid guiding hole is a tapered hole, and the diameter of the liquid guiding hole gradually increases along the radial direction of the rotor core or along the circumferential direction of the rotor core.

15. An electric motor, characterized in that, The motor has a rotor assembly as described in any one of claims 1 to 14.

16. A car, characterized in that, The vehicle has the motor as described in claim 15.

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