Rotor assembly and electric machine

Abstract

The application discloses a rotor assembly for a motor and a motor with the same. The rotor assembly comprises a first end plate, a second end plate and a rotor core. By arranging a cooling channel on the rotor core, a first communication channel on the first end plate and a second communication channel on the second end plate, the cooling channel cooperates with the first communication channel and the second communication channel to cool the rotor core. At least part of the projection of the first communication channel in the extension direction of the cooling channel is located on the radial inner side of the cooling channel; and / or at least part of the projection of the second communication channel in the extension direction of the cooling channel is located on the radial outer side of the cooling channel. A pressure difference is formed between the first end plate and the second end plate, an air flow is formed in the cooling channel, hot air in the cooling channel is taken out, and the rotor core is cooled.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, and in particular to a rotor assembly and an electric machine having the same. BACKGROUND

[0002] In the related art, the temperature of an electric machine rises too high during operation, which accelerates the aging of the electric machine and affects the safety of the electric machine. Currently, the electric machine mainly uses a shell cooling flow channel to cool the stator. The rotor end plate structure of the present application can assist in cooling the rotor. Cooling channels are provided on the rotor core and the rotor end plate, and the pressure difference and centrifugal principle are combined to form an airflow in the rotor core, which can discharge the hot air in the rotor core and improve the cooling effect of the rotor. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the prior art. To this end, one object of the present application is to provide a rotor assembly for an electric machine. The rotor assembly according to the present application comprises a first end plate, a second end plate and a rotor core. The first end plate and the second end plate are respectively assembled at both ends of the rotor core. A first communication channel, a cooling channel and a second communication channel form a cooling channel. The pressure difference and centrifugal principle are used to form an airflow in the rotor core, which can discharge the hot air in the rotor core and cool the rotor core.

[0004] The present application also provides an electric machine comprising the above rotor assembly.

[0005] The rotor assembly according to the present application comprises a rotor core, a first end plate and a second end plate. The cooling channel is formed in the rotor core. The first end plate is arranged at one end of the rotor core, and the first end plate has a first communication channel formed therein. The first communication channel is in communication with the cooling channel. The second end plate is arranged at one end of the rotor core, and the second end plate has a second communication channel formed therein. The second communication channel is in communication with the cooling channel. At least part of the projection of the first communication channel in the extension direction of the cooling channel is located on the inner side of the radial direction of the cooling channel. And / or at least part of the projection of the second communication channel in the extension direction of the cooling channel is located on the outer side of the radial direction of the cooling channel.

[0006] The first end plate, rotor core, and second end plate shaft are interference-fitted. The first and second end plates are coaxially fixed to both ends of the rotor core, and their structures are identical. Cooling channels are formed inside the rotor core. A first connecting channel is formed on the first end plate, which is connected to the cooling channels. A second connecting channel is provided on the second end plate, which is also connected to the cooling channels. The number of cooling channels is twice the number of the first and second connecting channels. The first connecting channel, the cooling channel, and the second connecting channel constitute a cooling channel. At least a portion of the projection of the first connecting channel in the extending direction of the cooling channel is located radially inside the cooling channel; and / or at least a portion of the projection of the second connecting channel in the extending direction of the cooling channel is located radially outside the cooling channel. This results in the pressure at the connection point between the first connecting channel and the cooling channel being lower than that at the connection point between the second connecting channel and the cooling channel. During rotor rotation, a pressure difference is generated at both ends of the rotor core, which in turn causes airflow to form inside the cooling channel. As the airflow flows through the cooling channel, it expels the hot air inside the rotor core, effectively reducing the rotor temperature. Furthermore, the first end plate, the rotor core, and the second end plate are connected by an interference fit, making assembly simpler.

[0007] According to one embodiment of the present invention, the inlet end of the second connecting channel is open in the axial direction and connected to the cooling channel, and the outlet end of the second connecting channel is open in the radial direction.

[0008] According to one embodiment of the present invention, a receiving groove is formed on the side surface of the second end plate facing the rotor core, the receiving groove being recessed away from the rotor core, the receiving groove being radially through the second end plate, and the inner wall of the receiving groove defining a second connecting channel.

[0009] According to one embodiment of the present invention, the inner wall of the receiving tank includes a bottom wall and a guide wall. The bottom wall is directly opposite at least a portion of the cooling channel; the guide wall is formed at least a portion of the edge of the bottom wall, and the extension direction of the guide wall is the same as the extension direction of the cooling channel.

[0010] According to one embodiment of the present invention, the bottom wall includes a first edge and a second edge, one end of the first edge intersects one end of the second edge, and the other end of the first edge is spaced apart from the other end of the second edge to define an air outlet of a second connecting channel; the air guide wall includes a first air guide wall and a second air guide wall. The first air guide wall is disposed on the first edge and perpendicular to the bottom wall; the second air guide wall is disposed on the second edge and perpendicular to the bottom wall.

[0011] According to one embodiment of the present invention, the included angle between the first edge and the second edge is α, and α satisfies: 45°≤α≤110°.

[0012] According to one embodiment of the present invention, the first air guide wall and the second air guide wall are constructed as a plane or arc that extends continuously in the radial direction.

[0013] According to one embodiment of the present application, the first end plate is provided with a third communication passage in communication with the cooling passage, and the second end plate is provided with a fourth communication passage in communication with the cooling passage, at least a part of the third communication passage projected in the extending direction of the cooling passage is located on the radial outer side of the cooling passage, and / or at least a part of the fourth communication passage projected in the extending direction of the cooling passage is located on the radial inner side of the cooling passage.

[0014] According to one embodiment of the present application, the first communication passage and the third communication passage are both configured as a plurality of passages, the plurality of first communication passages and the plurality of third communication passages are arranged in a circumferential direction at intervals, and the second communication passage and the fourth communication passage are both configured as a plurality of passages, the plurality of second communication passages and the plurality of fourth communication passages are arranged in a circumferential direction at intervals.

[0015] The motor according to the present application is briefly described below.

[0016] The motor according to the present application includes the rotor assembly according to any one of the above embodiments. Since the motor according to the present application includes the rotor assembly according to any one of the above embodiments, the motor according to the present application has a better cooling effect, a longer service life, and a better safety.

[0017] Additional aspects and advantages of the present application will be described in the description that follows, and partly become apparent from the description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 is a structure diagram of a rotor assembly according to the present application;

[0020] Figure 2 is a sectional view of a rotor assembly according to one embodiment of the present application;

[0021] Figure 3 is a structure diagram of a rotor core according to one embodiment of the present application;

[0022] Figure 4 is a structure diagram of a first end plate and a second end plate according to one embodiment of the present application;

[0023] Figure 5 is a structure diagram of a rotor assembly according to one embodiment of the present application.

[0024] REFERENCE NUMERALS:

[0025] rotor assembly 1;

[0026] The rotor core 11, the cooling channel 111;

[0027] The first end plate 12, the first communication channel 121, and the third communication channel 122;

[0028] The second end plate 13, the second communication channel 131, and the fourth communication channel 132;

[0029] The accommodating groove 14, the bottom wall 141, the first edge 1411, the second edge 1412, the air guide wall 142, the first air guide wall 1421, and the second air guide wall 1422. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0031] In the related art, the temperature rise of the motor during operation is too high, which accelerates the aging of the motor and affects the functional safety of the motor. At present, the motor mainly adopts the shell cooling flow channel to cool the stator. The rotor end plate structure of the present application can assist in cooling the rotor. The cooling channel is arranged on the rotor core and the rotor end plate, and the differential pressure and centrifugal principle are combined to form an air flow in the rotor core, so as to discharge the hot air in the rotor core and improve the cooling effect of the rotor.

[0032] Reference is made below to Figures 1-5 A rotor assembly 1 according to an embodiment of the present application is described.

[0033] According to the rotor assembly 1 of the present application, the rotor core 11, the first end plate 12, and the second end plate 13 are provided. The cooling channel 111 is formed in the rotor core 11. The first end plate 12 is arranged at one end of the rotor core 11, and the first communication channel 121 is formed on the first end plate 12. The first communication channel 121 is in communication with the cooling channel 111. The second end plate 13 is arranged at one end of the rotor core 11, and the second communication channel 131 is formed on the second end plate 13. The second communication channel 131 is in communication with the cooling channel 111. At least part of the projection of the first communication channel 121 in the extension direction of the cooling channel 111 is located on the inner side of the cooling channel 111 in the radial direction. And / or at least part of the projection of the second communication channel 131 in the extension direction of the cooling channel 111 is located on the outer side of the cooling channel 111 in the radial direction.

[0034] The first end plate 12, the rotor core 11 and the second end plate 13 are coaxially fixed to the rotor core 11 at two ends of the rotor core 11 through interference fit, and the first end plate 12 and the second end plate 13 are the same in structure. The cooling channel 111 is formed in the rotor core 11, the first communication channel 121 is formed on the first end plate 12 and communicates with the cooling channel 111, the second communication channel 131 is arranged on the second end plate 13 and communicates with the cooling channel 111, and the number of the cooling channel 111 is twice the number of the first communication channel 121 and the number of the second communication channel 131. The first communication channel 121, the cooling channel 111 and the second communication channel 131 constitute a cooling channel, wherein at least part of the projection of the first communication channel 121 in the extension direction of the cooling channel 111 is located on the inner side of the cooling channel 111 in the radial direction, and / or at least part of the projection of the second communication channel 131 in the extension direction of the cooling channel 111 is located on the outer side of the cooling channel 111 in the radial direction, so that the pressure at the communication position of the first communication channel 121 and the cooling channel 111 is lower than the pressure at the communication position of the second communication channel 131 and the cooling channel 111. During rotation of the rotor, a pressure difference is generated at two ends of the rotor core 11, so that an air flow is formed in the cooling channel 111, the hot air in the rotor core 11 is discharged during the flow of the air flow through the cooling channel 111, the temperature of the rotor core 11 can be effectively reduced, and the first end plate 12, the rotor core 11 and the second end plate 13 are connected through interference fit, so that the assembly is simpler.

[0035] According to an embodiment of the present application, the inlet end of the second communication channel 131 is open in the axial direction and communicates with the cooling channel 111, and the outlet end of the second communication channel 131 is open in the radial direction.

[0036] The inlet end of the second communication channel 131 is open in the axial direction and communicates with the cooling channel 111, and the gas flowing in the cooling channel 111 flows into the second communication channel 131 through the inlet end of the second communication channel 131, the gas carries out the temperature in the rotor core 11, and is radially discharged after passing through the second communication channel 131, so that the cooling of the rotor core 11 is realized.

[0037] According to an embodiment of the present application, the side surface of the second end plate 13 facing the rotor core 11 is formed with a containing groove 14 recessed away from the rotor core 11, the containing groove 14 penetrates through the second end plate 13 in the radial direction, and the inner wall of the containing groove 14 defines the second communication channel 131.

[0038] The second end plate 13 is formed with receiving grooves 14 on the side surface facing the rotor core 11, the receiving grooves 14 are recessed away from the rotor core 11, the number of the receiving grooves 14 is the same as that of the first communication channels 121, and the receiving grooves 14 are uniformly distributed on the second end plate 13. The receiving grooves 14 are through in the radial direction of the second end plate 13, the inner wall of the receiving grooves 14 defines the second communication channels 131, and during rotation of the rotor, the receiving grooves 14 form air flow in the rotor core 11 by centrifugal principle to discharge hot air in the rotor core 11, thereby improving the cooling effect of the rotor core 11.

[0039] According to one embodiment of the present application, the inner wall of the receiving groove 14 includes a bottom wall 141 and an air guide wall 142. The bottom wall 141 is opposite to at least part of the cooling channel 111, and the air guide wall 142 is formed on at least part of the edge of the bottom wall 141, and the extension direction of the air guide wall 142 is the same as that of the cooling channel 111.

[0040] The bottom wall 141 of the receiving groove 14 is opposite to at least part of the cooling channel 111, and the projection of the bottom wall 141 of the receiving groove 14 in the extension direction of the cooling channel 111 is higher than that of the cooling channel 111, thereby improving the pressure difference in the cooling channel 111. During rotation of the rotor, the wind speed in the rotor core 11 is faster due to the pressure difference. The air guide wall 142 is formed on at least part of the edge of the bottom wall 141, and the extension direction of the air guide wall 142 is the same as that of the cooling channel 111. During rotation of the rotor, the air guide wall 142 forms air flow in the rotor core 11 by centrifugal effect to discharge hot air in the rotor core 11 radially, thereby cooling the rotor core 11.

[0041] According to one embodiment of the present application, the bottom wall 141 includes a first edge 1411 and a second edge 1412, one end of the first edge 1411 intersects one end of the second edge 1412, and the other end of the first edge 1411 is spaced apart from the other end of the second edge 1412 to define an air outlet of the second communication channel 131; the air guide wall 142 includes a first air guide wall 1421 and a second air guide wall 1422, the first air guide wall 1421 is arranged on the first edge 1411 and perpendicular to the bottom wall 141, and the second air guide wall 1422 is arranged on the second edge 1412 and perpendicular to the bottom wall 141.

[0042] The first air guide wall 1421 is arranged on the first edge 1411 and is perpendicular to the bottom wall 141, and the second air guide wall 1422 is arranged on the second edge 1412 and is perpendicular to the bottom wall 141. The first air guide wall 1421 and the second air guide wall 1422 form an angle, and the angle ranges from 0° to 90°. According to some embodiments of the present application, the angle is generally configured as 80°. Since the first air guide wall 1421 and the second air guide wall 1422 are respectively perpendicular to the bottom wall 141, the air guiding effect of the air guide wall 142 is enhanced, the fluid flow rate in the cooling channel 111 is improved, and the cooling effect on the rotor core 11 is better.

[0043] According to an embodiment of the present application, the angle between the first edge 1411 and the second edge 1412 is α, and α satisfies: 45°≤α≤110°. Generally, α satisfies: 45°≤α≤90°. At this time, the air guiding effect of the first air guide wall 1421 and the second air guide wall 1422 which are perpendicular to the bottom wall 141 is outstanding, which is helpful to improve the cooling of the rotor core 11.

[0044] According to an embodiment of the present application, the first air guide wall 1421 and the second air guide wall 1422 are configured as a plane or an arc which continuously extends in the radial direction.

[0045] The first air guide wall 1421 and the second air guide wall 1422 are configured as a plane or an arc which continuously extends in the radial direction, and the first air guide wall 1421 and the second air guide wall 1422 are respectively perpendicular to the bottom wall 141. The first air guide wall 1421, the second air guide wall 1422 and the bottom wall 141 are configured as a fan blade structure. During rotation of the rotor, the first air guide wall 1421 and the second air guide wall 1422 are configured as a plane or an arc which continuously extends in the radial direction, which can improve the air guiding effect, make the wind speed in the cooling channel 111 faster, and facilitate to take away more heat, so as to achieve the cooling of the rotor core 11.

[0046] According to one embodiment of the present application, the first end plate 12 is provided with a third communication channel 122 communicating with the cooling channel 111, and the second end plate 13 is provided with a fourth communication channel 132 communicating with the cooling channel 111. At least part of the projection of the third communication channel 122 in the extension direction of the cooling channel 111 is located radially outside the cooling channel 111; and / or at least part of the projection of the fourth communication channel 132 in the extension direction of the cooling channel 111 is located radially inside the cooling channel 111.

[0047] The first end plate 12 and the second end plate 13 are structurally identical, and the first end plate 12 and the second end plate are assembled at both ends of the rotor core 11. The first end plate 12 is provided with a third communication channel 122 communicating with the cooling channel 111, and the second end plate 13 is provided with a fourth communication channel 132 communicating with the cooling channel 111. The assembly scheme can be changed according to actual conditions, so that the fluid flows into the cooling channel 111 from the fourth communication channel 132, and then flows out of the cooling channel 111 through the third communication channel 122. A pressure difference is formed between the fourth communication channel 132, the cooling channel 111 and the third communication channel 122, and the third communication channel 122 is a containing groove 14. By using the pressure difference and the centrifugal principle, the wind speed in the internal air passage of the rotor core 11 is faster, more heat can be taken away, and the cooling effect is better.

[0048] According to one embodiment of the present application, the first communication channel 121 and the third communication channel 122 are both configured as a plurality of channels, and the plurality of first communication channels 121 and the plurality of third communication channels 122 are arranged in a circumferential direction. The second communication channel 131 and the fourth communication channel 132 are both configured as a plurality of channels, and the plurality of second communication channels 131 and the plurality of fourth communication channels 132 are arranged in a circumferential direction.

[0049] The first communication passage 121, the cooling passage 111 and the second communication passage 131 form a stepped cooling passage, the fourth communication passage 132, the cooling passage 111 and the third communication passage 122 form a stepped cooling passage, the first communication passage 121 and the third communication passage 122 are both configured as a plurality of, the plurality of first communication passages 121 and the plurality of third communication passages 122 are arranged at intervals in the circumferential direction; the second communication passage 131 and the fourth communication passage 132 are both configured as a plurality of, the plurality of second communication passages 131 and the plurality of fourth communication passages 132 are arranged at intervals in the circumferential direction, according to the embodiment of the present application, the plurality of cooling passages utilize the pressure difference and the centrifugal principle to form airflow inside the rotor core 11, the rotor core 11 is cooled, and the first end plate 12 and the second end plate 13 are consistent in structure, during assembly, the relative positions of the first end plate 12 and the second end plate 13 are adjusted, the first end plate 12, the second end plate 13 and the cooling passage 111 cooperate to form a cooling passage, the effect of cooling the rotor core 11 is achieved, the first end plate 12 and the second end plate 13 are simple to process, and the first end plate 12, the second end plate 13 and the rotor core 11 are in interference fit, assembly is convenient.

[0050] The motor according to the present application is briefly described below.

[0051] The motor according to the present application includes the rotor assembly 1 described in any one of the above embodiments, so the motor according to the present application has better cooling effect, longer service life and better safety.

[0052] The rotor assembly 1 according to the present application is briefly described below.

[0053] The rotor assembly 1 according to the present application includes the rotor core 11, the first end plate 12 and the second end plate 13. The cooling passage 111 is formed in the rotor core 11, the first end plate 12 is arranged at one end of the rotor core 11, the first communication passage 121 is formed on the first end plate 12, and the first communication passage 121 is communicated with the cooling passage 111; the second end plate 13 is arranged at one end of the rotor core 11, the second communication passage 131 is formed on the second end plate 13, and the second communication passage 131 is communicated with the cooling passage 111; at least part of the projection of the first communication passage 121 in the extension direction of the cooling passage 111 is located on the radial inner side of the cooling passage 111; and / or at least part of the projection of the second communication passage 131 in the extension direction of the cooling passage 111 is located on the radial outer side of the cooling passage 111. A pressure difference is formed between the first end plate 12, the cooling passage 111 and the second end plate 13, fluid enters the cooling passage 111 from the first end plate 12 to carry out hot air, and the fluid is discharged through the second end plate 13, achieving the cooling effect of the rotor core 11.

[0054] According to one embodiment of the present application, the inlet end of the second communication passage 131 is axially open and communicates with the cooling passage 111, and the outlet end of the second communication passage 131 is radially open.

[0055] The inlet end of the second communication passage 131 is axially open and communicates with the cooling passage 111, and the gas flowing in the cooling passage 111 flows into the second communication passage 131 through the inlet end of the second communication passage 131, the gas carries away the temperature inside the rotor core 11, and is radially discharged after passing through the second communication passage 131, thereby achieving the cooling of the rotor.

[0056] According to one embodiment of the present application, the second end plate 13 is formed with a receiving groove 14 recessed away from the rotor core 11 on the side surface facing the rotor core 11, the receiving groove 14 penetrates in the radial direction of the second end plate 13, and the inner wall of the receiving groove 14 defines the second communication passage 131.

[0057] The second end plate 13 is formed with a receiving groove 14 recessed away from the rotor core 11 on the side surface facing the rotor core 11, the number of the receiving grooves 14 is the same as that of the first communication passages 121, and the receiving grooves 14 are uniformly distributed on the second end plate 13. The receiving groove 14 penetrates in the radial direction of the second end plate 13, and the inner wall of the receiving groove 14 defines the second communication passage 131. During the rotation of the rotor, the receiving groove 14 increases the flow rate of the fluid inside the rotor core 11 by the centrifugal principle, thereby improving the cooling effect of the rotor core 11.

[0058] According to one embodiment of the present application, the inner wall of the receiving groove 14 includes a bottom wall 141 and an air guide wall 142. The bottom wall 141 is opposite to at least part of the cooling passage 111, and the air guide wall 142 is formed on at least part of the edge of the bottom wall 141, and the extension direction of the air guide wall 142 is the same as that of the cooling passage 111.

[0059] According to one embodiment of the present application, the bottom wall 141 includes a first edge 1411 and a second edge 1412, one end of the first edge 1411 intersects one end of the second edge 1412, and the other end of the first edge 1411 is spaced apart from the other end of the second edge 1412 to define the air outlet of the second communication passage 131; and the air guide wall 142 includes a first air guide wall 1421 and a second air guide wall 1422. The first air guide wall 1421 is arranged on the first edge 1411 and is perpendicular to the bottom wall 141, and the second air guide wall 1422 is arranged on the second edge 1412 and is perpendicular to the bottom wall 141.

[0060] According to one embodiment of the present application, the included angle between the first edge 1411 and the second edge 1412 is α, and α satisfies: 45°≤α≤110°.

[0061] According to one embodiment of the present application, the first air deflector 1421 and the second air deflector 1422 are configured as a plane or an arc continuously extending in the radial direction.

[0062] According to one embodiment of the present application, the first end plate 12 is provided with a third communication passage 122 communicating with the cooling passage 111, and the second end plate 13 is provided with a fourth communication passage 132 communicating with the cooling passage 111, at least part of the projection of the third communication passage 122 in the extension direction of the cooling passage 111 is located on the outer side of the cooling passage 111 in the radial direction; and / or at least part of the projection of the fourth communication passage 132 in the extension direction of the cooling passage 111 is located on the inner side of the cooling passage 111 in the radial direction.

[0063] According to one embodiment of the present application, the first communication passage 121 and the third communication passage 122 are both configured as a plurality of, the plurality of first communication passages 121 and the plurality of third communication passages 122 are arranged in the circumferential direction; the second communication passage 131 and the fourth communication passage 132 are both configured as a plurality of, the plurality of second communication passages 131 and the plurality of fourth communication passages 132 are arranged in the circumferential direction.

[0064] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0065] In the description of the present application, "first feature" and "second feature" can include one or more of the features.

[0066] In the description of the present application, "a plurality of" means two or more.

[0067] In the description of the present application, "above" or "below" the first feature of the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them.

[0068] In the description of the present application, "above", "above" and "above" of the first feature of the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.

[0069] In the description of the specification, reference to "one embodiment", "some embodiments", "an exemplary embodiment", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "in some embodiments", "in an exemplary embodiment", "an example", "a specific example", or "some examples" in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0070] Although embodiments of the application have been shown and described, it will be appreciated that those skilled in the art can make various changes, modifications, substitutions and alterations thereto without departing from the principles and scope of the application, which are defined by the claims and their equivalents.

Claims

1. A rotor assembly for an electric machine, characterized by, The rotor assembly comprises: a rotor core, a cooling channel being formed in the rotor core; a first end plate, the first end plate being arranged at one end of the rotor core, a first communication channel being formed on the first end plate, the first communication channel being in communication with the cooling channel; a second end plate, the second end plate being arranged at one end of the rotor core, a second communication channel being formed on the second end plate, the second communication channel being in communication with the cooling channel; wherein at least a part of the first communication channel, in projection in the extension direction of the cooling channel, is located on the radially inner side of the cooling channel; and / or at least a part of the second communication channel, in projection in the extension direction of the cooling channel, is located on the radially outer side of the cooling channel; an inlet end of the second communication channel is open in the axial direction and in communication with the cooling channel, and an outlet end of the second communication channel is open in the radial direction; a receiving groove is formed on one side surface of the second end plate, facing away from the rotor core, the receiving groove being through in the radial direction of the second end plate, and an inner wall of the receiving groove defining the second communication channel; the inner wall of the receiving groove comprises: a bottom wall, the bottom wall being opposite to at least a part of the cooling channel; an air guide wall, the air guide wall being formed on at least a part of the edge of the bottom wall, and the extension direction of the air guide wall being the same as the extension direction of the cooling channel; the bottom wall comprises: a first edge and a second edge, one end of the first edge intersecting one end of the second edge, and the other end of the first edge being spaced apart from the other end of the second edge to define an air outlet of the second communication channel; the air guide wall comprises: a first air guide wall, the first air guide wall being arranged on the first edge and being perpendicular to the bottom wall; a second air guide wall, the second air guide wall being arranged on the second edge and being perpendicular to the bottom wall; an included angle between the first edge and the second edge is α, and the α satisfies: 45°≤α≤110°. the first air guide wall and the second air guide wall are configured as a plane or an arc continuously extending in the radial direction.

2. The rotor assembly for an electric machine of claim 1, wherein, the first end plate is provided with a third communication channel in communication with the cooling channel, and the second end plate is provided with a fourth communication channel in communication with the cooling channel, 3. A rotor assembly for an electric machine according to any of claims 1-2, characterized in that, at least a part of the third communication channel, in projection in the extension direction of the cooling channel, is located on the radially outer side of the cooling channel; and / or at least a part of the fourth communication channel, in projection in the extension direction of the cooling channel, is located on the radially inner side of the cooling channel. the first communication channel and the third communication channel are both configured as a plurality of channels, the plurality of first communication channels and the plurality of third communication channels being arranged in the circumferential direction; and the second communication channel and the fourth communication channel are both configured as a plurality of channels, the plurality of second communication channels and the plurality of fourth communication channels being arranged in the circumferential direction.

4. The rotor assembly for an electric machine of claim 3, wherein, The rotor assembly comprises:

5. An electric machine characterized by the rotor assembly according to any one of claims 1-4. ​

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