Rotor assembly, motor and vehicle

Abstract

The invention discloses a rotor assembly, a motor and a vehicle, the rotor assembly comprises a rotating shaft, a heat dissipation member and a plurality of rotor cores, the rotating shaft is internally provided with an oil inlet cavity and an oil outlet cavity which are arranged at intervals in the axial direction of the rotating shaft, the oil inlet cavity is used for allowing cooling oil to flow into the rotor assembly, and the oil outlet cavity is used for allowing the cooling oil to flow out of the rotor assembly; each rotor core is sleeved on the rotating shaft, the plurality of rotor cores are sequentially arranged along the axial direction of the rotating shaft, the heat dissipation piece is sleeved on the rotating shaft, a first accommodating cavity is formed in the heat dissipation piece, the first accommodating cavity is communicated with the oil inlet cavity and the oil outlet cavity, and the heat dissipation piece is used for exchanging heat with at least one rotor core. By arranging the oil inlet cavity and the oil outlet cavity in the rotating shaft and further arranging the heat dissipation piece on the rotating shaft, cooling oil can flow through the rotating shaft and the heat dissipation piece, the cooling oil can dissipate heat of the rotating shaft and also can dissipate heat through the heat dissipation piece, the rotor iron core and the magnetic steel arranged on the rotor iron core, the risk of overheating of the rotor assembly is reduced, and the service life of the rotor assembly is prolonged. Therefore, demagnetization of the magnetic steel is prevented.

Description

Technical Field

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

[0002] In related technologies, in order to improve the heat dissipation efficiency of motors, the stator assembly is usually immersed in cooling oil. However, this heat dissipation method has strong limitations and cannot guarantee the heat dissipation efficiency of the rotor assembly, which can easily lead to overheating of the rotor assembly. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a rotor assembly with good heat dissipation performance.

[0004] According to an embodiment of the present invention, a rotor assembly includes: a rotating shaft, wherein an oil inlet chamber and an oil outlet chamber are provided therein at intervals in its axial direction, the oil inlet chamber being used for supplying cooling oil into the rotor assembly, and the oil outlet chamber being used for supplying cooling oil out of the rotor assembly; a plurality of rotor cores, each rotor core being sleeved on the rotating shaft, and the plurality of rotor cores being arranged sequentially along the axial direction of the rotating shaft; and a heat sink, the heat sink being sleeved on the rotating shaft, and having a first receiving cavity formed therein, the first receiving cavity communicating with the oil inlet chamber and the oil outlet chamber, the heat sink being used for heat exchange with at least one of the rotor cores.

[0005] According to the rotor assembly of the present invention, an oil inlet chamber and an oil outlet chamber are respectively provided in the rotating shaft, and a heat dissipation component is further provided on the rotating shaft. The first receiving cavity in the heat dissipation component can connect the oil inlet chamber and the oil outlet chamber, so that cooling oil can flow through the rotating shaft and the heat dissipation component. The cooling oil can directly dissipate heat on the rotating shaft, and at the same time, it can also dissipate heat through the heat dissipation component and the rotor core and the magnets provided on the rotor core, thereby reducing the risk of overheating of the rotor assembly, which helps to prevent the magnets from demagnetizing, and thus helps to improve the service life of the rotor assembly.

[0006] According to some embodiments of the present invention, a plurality of heat sinks are provided, and the plurality of rotor cores are arranged at intervals along the axial direction of the rotating shaft, and the heat sink is sandwiched between two adjacent rotor cores, and the heat sink exchanges heat with the adjacent rotor cores.

[0007] According to some embodiments of the present invention, the heat sink is provided with a plurality of first receiving cavities, and the plurality of first receiving cavities are arranged at intervals along the circumferential direction of the heat sink.

[0008] According to some embodiments of the present invention, each heat sink has a plurality of first connecting channels and a plurality of second connecting channels, and the plurality of first receiving cavities, the plurality of first connecting channels and the plurality of second connecting channels correspond one-to-one. The first connecting channels connect the oil inlet cavity and the corresponding first receiving cavity, and the second connecting channels connect the oil outlet cavity and the corresponding first receiving cavity.

[0009] According to some embodiments of the present invention, the rotating shaft has an oil inlet channel and an oil outlet channel, the oil inlet channel connecting the oil inlet chamber and at least one first connecting channel, and the oil outlet channel connecting the oil outlet chamber and at least one second connecting channel.

[0010] According to some embodiments of the present invention, the rotor assembly further includes: two dynamic balancing plates, both of which are sleeved on the rotating shaft, and a plurality of rotor cores are located between the two dynamic balancing plates. A second receiving cavity is formed in the dynamic balancing plate, the second receiving cavity is connected to the oil inlet cavity and the oil outlet cavity, and the dynamic balancing plate is used for heat exchange between adjacent rotor cores. According to some embodiments of the present invention, at least one of the first and second accommodating cavities is provided with a plurality of turbulence protrusions.

[0011] According to some embodiments of the present invention, the rotor assembly further includes an impeller disposed within the oil outlet chamber, and the rotating shaft is adapted to drive the impeller to rotate synchronously, so as to create a negative pressure within the oil outlet chamber.

[0012] The second objective of this invention is to provide an electric motor.

[0013] The motor according to an embodiment of the present invention includes the rotor assembly described above.

[0014] The motor has the same advantages as the rotor assembly described above, and will not be repeated here.

[0015] The third objective of this invention is to provide a vehicle.

[0016] The vehicle according to an embodiment of the present invention includes the motor described above.

[0017] The vehicle described above has the same advantages as the motors mentioned above, which will not be elaborated here.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the rotor assembly described in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the rotor assembly described in an embodiment of the present invention. Figure 2 ; Figure 3 for Figure 2 A sectional view drawn in AA; Figure 4 for Figure 3 Sectional view at BB; Figure 5 for Figure 4 The sectional view at CC, i.e., the sectional view of the heat sink; Figure 6 This is a schematic diagram of the heat sink component according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the rotating shaft according to an embodiment of the present invention; Figure 8 for Figure 7 Sectional view at DD; Figure 9 for Figure 7 Sectional view at EE; Figure 10 This is a schematic diagram of the structure of the dynamic balancing plate according to an embodiment of the present invention; Figure 11 This is a cross-sectional view of the dynamic balancing plate described in an embodiment of the present invention.

[0020] Figure label: Rotor assembly 100 Rotating shaft 110, oil inlet chamber 111, oil outlet chamber 112, oil inlet channel 113, oil outlet channel 114 Rotor core 120 Heat sink 130, first receiving cavity 131, first connecting channel 132, second connecting channel 133 Dynamic balancing plate 140, second receiving cavity 141, third connecting channel 142, fourth connecting channel 143. Turbation protrusion 150, impeller 160. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The following is for reference. Figures 1-11 A rotor assembly 100 according to an embodiment of the present invention is described.

[0024] Combination Figures 1 to 6 According to an embodiment of the present invention, the rotor assembly 100 includes: a rotating shaft 110, a heat sink 130, and a plurality of rotor cores 120. The rotating shaft 110 is provided with an oil inlet chamber 111 and an oil outlet chamber 112 spaced apart in its axial direction. The oil inlet chamber 111 is used for supplying cooling oil into the rotor assembly 100, and the oil outlet chamber 112 is used for supplying cooling oil out of the rotor assembly 100. During the process of the cooling oil flowing through the oil inlet chamber 111 and the oil outlet chamber 112, it can at least exchange heat with the rotating shaft 110 to dissipate heat from the rotating shaft 110 and improve the heat dissipation efficiency of the rotating shaft 110.

[0025] Each rotor core 120 is sleeved on the rotating shaft 110, and multiple rotor cores 120 are arranged sequentially along the axial direction of the rotating shaft 110. A heat sink 130 is sleeved on the rotating shaft 110 and can be interference-fitted with the rotating shaft 110. A first receiving cavity 131 is formed inside the heat sink 130. The first receiving cavity 131 connects the oil inlet cavity 111 and the oil outlet cavity 112. The heat sink 130 is used for heat exchange with at least one rotor core 120. Cooling oil can flow from the oil inlet cavity 111 into the first receiving cavity 131 so that the heat sink 130 can play the role of heat exchange for the rotor core 120. The rotor core 120 and the magnets provided on the rotor core 120 can be cooled by the heat sink 130, thereby improving the heat dissipation efficiency of the rotor core 120 and the magnets.

[0026] In related technologies, in order to improve the heat dissipation efficiency of motors, the stator assembly is usually immersed in cooling oil. However, this heat dissipation method has strong limitations and cannot guarantee the heat dissipation efficiency of the rotor assembly, which can easily lead to overheating of the rotor assembly.

[0027] This application provides an oil inlet chamber 111 and an oil outlet chamber 112 within the rotating shaft 110, and further provides a heat sink 130 on the rotating shaft 110. The first receiving cavity 131 within the heat sink 130 can connect the oil inlet chamber 111 and the oil outlet chamber 112, so that cooling oil can flow through the rotating shaft 110 and the heat sink 130. The cooling oil can directly dissipate heat from the rotating shaft 110, and at the same time, it can also dissipate heat from the rotor core 120 and the magnets provided on the rotor core 120 through the heat sink 130, reducing the risk of overheating of the rotor assembly 100, thereby helping to prevent demagnetization of the magnets and thus helping to improve the service life of the rotor assembly 100.

[0028] Combination Figures 1 to 4 In some embodiments of the present invention, a plurality of heat sinks 130 are provided, and a plurality of rotor cores 120 are arranged at intervals along the axial direction of the rotating shaft 110, and a heat sink 130 is sandwiched between two adjacent rotor cores 120, and the heat sink 130 exchanges heat with the adjacent rotor cores 120.

[0029] For example, a heat sink 130 is sandwiched between two adjacent rotor cores 120. Each heat sink 130 can exchange heat with the rotor cores 120 located on both sides of it. This not only improves the heat dissipation efficiency of each rotor core 120 and the magnets disposed thereon, but also helps to reduce the number of heat sinks 130, reduce the heat dissipation cost of the rotor assembly 100, and facilitates the miniaturization design of the rotor assembly 100.

[0030] Combination Figure 5 and Figure 6In some embodiments of the present invention, the heat sink 130 is provided with a plurality of first receiving cavities 131, which are arranged at intervals along the circumferential direction of the heat sink 130. Each first receiving cavity 131 is connected to the oil inlet cavity 111 and the oil outlet cavity 112, which is beneficial to improving the efficiency of cooling oil flowing through the heat sink 130, thereby improving the heat dissipation efficiency of the rotor assembly 100.

[0031] In some specific examples, each heat sink 130 may be provided with four first receiving cavities 131. In the axial projection of the rotor assembly 100, the outer contour of the projection of each first receiving cavity 131 can be formed as a fan shape. This arrangement is conducive to maximizing the volume of each first receiving cavity 131 within the limited space of the heat sink 130, improving the efficiency of cooling oil flow through the heat sink 130, while reducing the number of first receiving cavities 131. This is conducive to improving the processing convenience of the heat sink 130, improving the production efficiency of the heat sink 130, and thus improving the production efficiency of the rotor assembly 100.

[0032] Combination Figures 3 to 5 In some embodiments of the present invention, each heat sink 130 is formed with a plurality of first connecting channels 132 and a plurality of second connecting channels 133. The plurality of first receiving cavities 131, the plurality of first connecting channels 132 and the plurality of second connecting channels 133 correspond one-to-one. The first connecting channel 132 connects the oil inlet cavity 111 and the corresponding first receiving cavity 131, and the second connecting channel 133 connects the oil outlet cavity 112 and the corresponding first receiving cavity 131.

[0033] For example, each first receiving cavity 131 is respectively provided with a first connecting channel 132 and a second connecting channel 133. The first connecting channel 132 can be connected to the side of the first receiving cavity 131 near the central axis of the rotating shaft 110, which is beneficial to shorten the length of the first connecting channel 132, thereby shortening the flow path of the cooling oil from the oil inlet cavity 111 into the first receiving cavity 131, and thus improving the efficiency of the cooling oil flowing into the first receiving cavity 131.

[0034] The second connecting channel 133 can be set on the side wall of the first receiving cavity 131 that is offset from the first connecting channel 132, so as to prevent the cooling oil from flowing out directly through the second connecting channel 133 after entering the first receiving cavity 131 due to the first connecting channel 132 being too close to the second connecting channel 133 or being set opposite to it. This ensures that the cooling oil can flow fully in the first receiving cavity 131, thereby ensuring the heat exchange effect with the rotor core 120.

[0035] Combination Figures 3 to 5 as well as Figures 7 to 8The rotating shaft 110 has an oil inlet channel 113 and an oil outlet channel 114. The oil inlet channel 113 connects the oil inlet chamber 111 and at least one first connecting channel 132, and the oil outlet channel 114 connects the oil outlet chamber 112 and at least one second connecting channel 133.

[0036] For example, the oil inlet channel 113 may include a first oil inlet section and a second oil inlet section that are interconnected. The first oil inlet section may extend radially from the cavity wall of the oil inlet chamber 111 to the outer wall surface of the rotating shaft 110. During the operation of the rotor assembly 100, the cooling oil entering the oil inlet chamber 111 may flow into the first oil inlet section under the action of centrifugal force. The second oil inlet section is constructed as a groove structure formed on the outer wall surface of the rotating shaft 110, and the second oil inlet section may extend axially along the rotating shaft 110. Each second oil inlet section is connected to a first connecting channel 132 in which multiple heat sinks 130 are arranged opposite each other in the axial direction of the rotating shaft 110.

[0037] The oil outlet channel 114 may include a first oil outlet section and a second oil outlet section that are interconnected. The first oil outlet section may extend radially from the cavity wall of the oil outlet chamber 112 to the outer wall surface of the rotating shaft 110. The second oil outlet section is constructed as a groove structure formed on the outer wall surface of the rotating shaft 110, and the second oil outlet section may extend axially along the rotating shaft 110. Each second oil outlet section is connected to a second connecting channel 133 in which multiple heat sinks 130 are arranged opposite each other in the axial direction of the rotating shaft 110.

[0038] In the circumferential direction of the rotating shaft 110, a second oil outlet section is provided between two adjacent second oil inlet sections.

[0039] Therefore, not only can the connection between the oil inlet channel 113 and the first connecting channel 132 be realized, as well as the connection between the oil outlet channel 114 and the second connecting channel 133 be realized, but it is also beneficial to simplify the number of oil inlet channels 113 and oil outlet channels 114, reduce the manufacturing difficulty of the rotating shaft 110, and improve the manufacturing efficiency of the rotating shaft 110, thereby improving the manufacturing efficiency of the rotor assembly 100.

[0040] Combination Figure 1 , Figure 3 , Figure 4 , Figure 10 and Figure 11In some embodiments of the present invention, the rotor assembly 100 further includes: two dynamic balancing plates 140, both of which are sleeved on the rotating shaft 110 and can be interference-fitted with the rotating shaft 110, and multiple rotor cores 120 are located between the two dynamic balancing plates 140. A second receiving cavity 141 is formed in the dynamic balancing plate 140, the second receiving cavity 141 is connected to the oil inlet cavity 111 and the oil outlet cavity 112, and the dynamic balancing plate 140 is used for heat exchange between adjacent rotor cores 120. Thus, not only can the dynamic balancing plate 140 have the function of heat exchange for the rotor cores 120, improving the functionality of the dynamic balancing plate 140, but it can also improve the heat exchange efficiency and heat exchange uniformity of the rotor cores 120 located at the ends of the multiple rotor cores 120, preventing poor heat dissipation effect caused by the rotor cores 120 located at the ends of the multiple rotor cores 120 having a heat dissipation component 130 on only one side.

[0041] In some specific examples, each dynamic balancing plate 140 may be provided with four second receiving cavities 141. In the axial projection of the rotor assembly 100, the outer contour of the projection of each second receiving cavity 141 can be formed as a fan shape. This arrangement is conducive to maximizing the volume of each second receiving cavity 141 within the limited space of the dynamic balancing plate 140, improving the efficiency of cooling oil flow through the dynamic balancing plate 140, while reducing the number of second receiving cavities 141. This is beneficial to improving the processing convenience of the dynamic balancing plate 140, improving the production efficiency of the dynamic balancing plate 140, and thus improving the production efficiency of the rotor assembly 100.

[0042] Combination Figure 3 , Figure 4 , Figure 10 and Figure 11 In some embodiments of the present invention, each dynamic balancing plate 140 is formed with a plurality of third connecting channels 142 and a plurality of fourth connecting channels 143, and a plurality of second receiving cavities 141, a plurality of third connecting channels 142 and a plurality of fourth connecting channels 143 correspond one-to-one. The third connecting channel 142 connects the oil inlet cavity 111 and the corresponding second receiving cavity 141, and the fourth connecting channel 143 connects the oil outlet cavity 112 and the corresponding second receiving cavity 141.

[0043] For example, each second receiving cavity 141 is respectively provided with a third connecting channel 142 and a fourth connecting channel 143. The third connecting channel 142 can connect to the side of the second receiving cavity 141 near the central axis of the rotating shaft 110, which is beneficial to shorten the length of the third connecting channel 142, thereby shortening the flow path of the cooling oil from the oil inlet cavity 111 into the second receiving cavity 141, and thus improving the efficiency of the cooling oil flowing into the second receiving cavity 141.

[0044] The fourth connecting channel 143 can be set on the side wall of the second receiving cavity 141 that is offset from the third connecting channel 142, so as to prevent the cooling oil from flowing out directly through the fourth connecting channel 143 after entering the second receiving cavity 141 due to the third connecting channel 142 being too close to or being set opposite to the fourth connecting channel 143. This ensures that the cooling oil can flow fully in the second receiving cavity 141, thereby ensuring the heat exchange effect with the rotor core 120.

[0045] Furthermore, each second oil inlet section can also be connected to a third connecting channel 142 in which two dynamic balance plates 140 are arranged opposite each other in the axial direction of the rotating shaft 110, and each second oil outlet section can also be connected to a fourth connecting channel 143 in which two dynamic balance plates 140 are arranged opposite each other in the axial direction of the rotating shaft 110.

[0046] Therefore, it is possible not only to connect the oil inlet channel 113 and the third connecting channel 142, as well as the oil outlet channel 114 and the fourth connecting channel 143, but also to simplify the number of oil inlet channels 113 and oil outlet channels 114, reduce the manufacturing difficulty of the rotating shaft 110, and improve the manufacturing efficiency of the rotating shaft 110, thereby improving the manufacturing efficiency of the rotor assembly 100.

[0047] In some embodiments of the present invention, the fourth connecting channel 143 may also connect two adjacent second receiving cavities 141 so that the cooling oil can flow fully within the dynamic balance plate 140, thereby improving the heat exchange efficiency of the cooling oil.

[0048] Combination Figure 5 and Figure 11 In some embodiments of the present invention, at least one of the first receiving cavity 131 and the second receiving cavity 141 is provided with a plurality of turbulence protrusions 150.

[0049] For example, multiple turbulence protrusions 150 can be provided in both the first receiving cavity 131 and the second receiving cavity 141. Each turbulence protrusion 150 can be formed into a cylindrical shape. When cooling oil enters the first receiving cavity 131 and the second receiving cavity 141, the turbulence protrusions 150 can turbulentize the cooling oil, so that the cooling oil entering the first receiving cavity 131 and the second receiving cavity 141 can form turbulence, increase the flow rate of the cooling oil, and thus help improve the heat exchange effect of the rotor core 120.

[0050] Combination Figure 3 and Figure 4In some embodiments of the present invention, the rotor assembly 100 further includes an impeller 160, which can be embedded in the oil outlet chamber 112 by interference fit. The rotating shaft 110 is adapted to drive the impeller 160 to rotate synchronously, so that a negative pressure is formed in the oil outlet chamber 112. The cooling oil can overcome the centrifugal force generated during the operation of the rotor assembly 100 under the action of the negative pressure and be drawn into the oil outlet chamber 112, and further discharged from the oil outlet chamber 112, so as to realize the heat exchange cycle of the cooling oil and prevent the cooling oil after heat absorption from accumulating in the rotor assembly 100 and affecting the heat exchange efficiency of the rotor assembly 100.

[0051] The motor according to an embodiment of the present invention includes the rotor assembly 100 described above.

[0052] Since the rotor assembly 100 is provided with electrodes, an oil inlet chamber 111 and an oil outlet chamber 112 are respectively provided in the rotating shaft 110, and a heat sink 130 is further provided on the rotating shaft 110. The first receiving cavity 131 in the heat sink 130 can connect the oil inlet chamber 111 and the oil outlet chamber 112, so that the cooling oil can flow through the rotating shaft 110 and the heat sink 130. The cooling oil can directly dissipate heat from the rotating shaft 110. At the same time, it can also dissipate heat from the rotor core 120 and the magnets provided on the rotor core 120 through the heat sink 130, reducing the risk of overheating of the rotor assembly 100. This helps to prevent the magnets from demagnetizing, thereby improving the service life of the rotor assembly 100. This is beneficial to improving the operational reliability and service life of the motor.

[0053] In some embodiments of the present invention, the rotating shaft 110 includes a first end and a second end. An oil inlet chamber 111 is disposed at the first end of the rotating shaft 110 and is located near the rotary transformer. An oil outlet chamber 112 is disposed at the second end of the rotating shaft 110 and is located near the gear. The distance between the first end and the motor housing is smaller than the distance between the second end and the motor housing. Cooling oil is transported to the rotor assembly 100 through the housing. Therefore, by arranging the oil inlet chamber 111 at the first end near the housing, it is beneficial to improve the efficiency of cooling oil being transported to the rotor assembly 100, thereby improving the heat dissipation efficiency of the rotor assembly 100.

[0054] The vehicle according to an embodiment of the present invention includes the motor described above.

[0055] Since the vehicle includes the aforementioned motor and the electrodes are equipped with the aforementioned rotor assembly 100, an oil inlet chamber 111 and an oil outlet chamber 112 are respectively provided in the rotating shaft 110, and a heat sink 130 is further provided on the rotating shaft 110. The first receiving cavity 131 in the heat sink 130 can connect the oil inlet chamber 111 and the oil outlet chamber 112, so that the cooling oil can flow through the rotating shaft 110 and the heat sink 130. The cooling oil can directly dissipate heat from the rotating shaft 110, and at the same time, it can also dissipate heat from the rotor core 120 and the magnets provided on the rotor core 120 through the heat sink 130, reducing the risk of overheating of the rotor assembly 100, thereby helping to prevent the magnets from demagnetizing, and thus helping to improve the service life of the rotor assembly 100. This is beneficial to improving the operational reliability and service life of the motor, thereby helping to reduce the maintenance frequency of the vehicle.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor assembly, characterized in that, include: A rotating shaft (110) is provided with an oil inlet chamber (111) and an oil outlet chamber (112) spaced apart in its axial direction. The oil inlet chamber (111) is used to allow cooling oil to flow into the rotor assembly, and the oil outlet chamber (112) is used to allow the cooling oil to flow out of the rotor assembly. Multiple rotor cores (120) are provided, each of which is sleeved on the rotating shaft (110), and the multiple rotor cores (120) are arranged sequentially along the axial direction of the rotating shaft (110); A heat sink (130) is sleeved on the rotating shaft (110), and a first receiving cavity (131) is formed inside the heat sink (130). The first receiving cavity (131) connects the oil inlet cavity (111) and the oil outlet cavity (112). The heat sink (130) is used for heat exchange with at least one of the rotor cores (120).

2. The rotor assembly according to claim 1, characterized in that, The heat sink (130) is provided in multiple ways. The multiple rotor cores (120) are arranged at intervals along the axial direction of the rotating shaft (110), and the heat sink (130) is sandwiched between two adjacent rotor cores (120). The heat sink (130) exchanges heat with the adjacent rotor core (120).

3. The rotor assembly according to claim 2, characterized in that, The heat sink (130) is provided with a plurality of first receiving cavities (131), and the plurality of first receiving cavities (131) are arranged at intervals along the circumferential direction of the heat sink (130).

4. The rotor assembly according to claim 3, characterized in that, Each heat sink (130) has a plurality of first connecting channels (132) and a plurality of second connecting channels (133). The plurality of first receiving cavities (131), the plurality of first connecting channels (132) and the plurality of second connecting channels (133) correspond one-to-one. The first connecting channel (132) connects the oil inlet cavity (111) and the corresponding first receiving cavity (131), and the second connecting channel (133) connects the oil outlet cavity (112) and the corresponding first receiving cavity (131).

5. The rotor assembly according to claim 4, characterized in that, The rotating shaft (110) has an oil inlet channel (113) and an oil outlet channel (114). The oil inlet channel (113) connects the oil inlet chamber (111) and at least one of the first connecting channels (132). The oil outlet channel (114) connects the oil outlet chamber (112) and at least one of the second connecting channels (133).

6. The rotor assembly according to claim 1, characterized in that, The rotor assembly further includes two dynamic balancing plates (140), both of which are sleeved on the rotating shaft (110), and a plurality of rotor cores (120) are located between the two dynamic balancing plates (140). A second receiving cavity (141) is formed in the dynamic balancing plate (140), the second receiving cavity (141) is connected to the oil inlet cavity (111) and the oil outlet cavity (112), and the dynamic balancing plate (140) is used for heat exchange between adjacent rotor cores (120).

7. The rotor assembly according to claim 6, characterized in that, At least one of the first receiving cavity (131) and the second receiving cavity (141) is provided with a plurality of turbulence protrusions (150).

8. The rotor assembly according to claim 1, characterized in that, The rotor assembly further includes an impeller (160), which is disposed in the oil outlet chamber (112). The rotating shaft (110) is adapted to drive the impeller (160) to rotate synchronously so that a negative pressure is formed in the oil outlet chamber (112).

9. An electric motor, characterized in that, Includes the rotor assembly according to any one of claims 1-8.

10. A vehicle, characterized in that, Includes the motor according to claim 9.

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