Rotor assembly and electric machine

Abstract

The application relates to the technical field of automobile parts, and provides a rotor assembly and a motor. The rotor assembly comprises a rotor shaft, an oil inlet channel and a flow distribution hole which are connected in communication; a rotor core which is sleeved on the rotor shaft and is provided with a flow guide groove which is in communication with the flow distribution hole, the flow guide groove being formed in an inner surface of the rotor core, the rotor core being further provided with a plurality of core internal channels which are spaced from the flow guide groove; and two balance plates which are sleeved on the rotor shaft and are located at two ends of the rotor core, each balance plate being provided with a flow guide channel which is in communication with the flow guide groove and a part of the core internal channels, and a oil throwing structure which is spaced from the flow guide channel and is in communication with another part of the core internal channels. The application cooperates the rotor shaft, the rotor core and the two balance plates, constructs a cooling flow path which penetrates the inside of the rotor core, directly delivers the cooling medium to the concentrated heating area of the rotor core, realizes efficient cooling, and significantly reduces the rotor temperature rise.

Description

Technical Field

[0001] This application relates to the field of automotive parts technology, and more specifically, to rotor assemblies and motors. Background Technology

[0002] Traditional motor rotor cooling solutions often suffer from unreasonable cooling channel layouts, making it difficult to effectively guide the cooling medium to the critical heat-generating areas inside the rotor, thus affecting heat dissipation efficiency. In addition, the complex design of rotor components increases manufacturing and assembly costs.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] This application provides a rotor assembly and a motor that can effectively solve the problems of unreasonable cooling channel layout affecting heat dissipation efficiency and complex component design increasing manufacturing and assembly costs.

[0005] According to one aspect of this application, a rotor assembly is provided, comprising: a rotor shaft having a communicating oil inlet channel and a diversion hole; a rotor core sleeved on the rotor shaft having a guide groove communicating with the diversion hole, the guide groove being formed on the inner surface of the rotor core, the rotor core also having a plurality of internal core channels spaced apart from the guide groove; and two balance plates sleeved on the rotor shaft at both ends of the rotor core, each balance plate having a guide channel communicating with the guide groove and a portion of the internal core channels, and an oil-throwing structure spaced apart from the guide channel and communicating with another portion of the internal core channels.

[0006] In some embodiments, the rotor assembly includes two sets of cooling flow paths, each set of cooling flow paths forming the following flow path structure: entering the rotor assembly from the oil inlet channel, flowing through the diversion hole and the guide groove to one end face of the rotor core, flowing through the guide channel of a balance plate and part of the internal channel of the core to the other end face of the rotor core, and being thrown out by the oil throwing structure of another balance plate.

[0007] In some embodiments, the rotor shaft is formed as a hollow structure at one end to form an axially extending oil inlet channel therein.

[0008] In some embodiments, the diversion holes radially penetrate the rotor shaft; the diversion holes include a plurality of circumferentially spaced holes and form multiple sets that are axially staggered.

[0009] In some embodiments, the diversion holes include six circumferentially evenly spaced holes that form two axially staggered groups, wherein adjacent diversion holes in each group are spaced 120 degrees apart circumferentially, and the two groups of diversion holes are spaced 10 mm to 20 mm apart axially.

[0010] In some embodiments, the number of the flow channels is equal to the number of the flow splitting holes, wherein each flow splitting hole is connected to a flow channel; each flow channel is connected to a flow channel and an internal channel of the iron core; each balance plate includes multiple oil-throwing structures, and the number of internal channels of the iron core is twice the number of oil-throwing structures of each balance plate.

[0011] In some embodiments, the rotor core is provided with six sets of magnetic poles; the flow divider holes and the flow guide grooves each include six; the internal channels of the core are arranged close to the magnetic pole groups, and the internal channels of the core include six sets, wherein each set includes two internal channels of the core that cooperate with two balance plates respectively; each balance plate has six flow guide channels and six oil slinging structures.

[0012] In some embodiments, the rotor core is provided with multiple sets of magnetic pole groups, wherein each set of magnetic pole groups is formed as a V-shaped oblique pole along the axial direction; the guide groove is formed as a straight groove along the axial direction, and the internal channel of each core is formed as a straight hole along the axial direction.

[0013] In some embodiments, the internal channels of the iron core include multiple sets, each set of internal channels of the iron core is disposed between adjacent magnetic pole sets; the rotor iron core includes multiple iron core segments, wherein the magnetic pole sets of each iron core segment are axially connected to form the magnetic pole sets of the rotor iron core, the guide grooves of each iron core segment are axially connected to form the guide grooves of the rotor iron core, and the internal channels of each iron core segment are axially connected to form the internal channels of the rotor iron core.

[0014] In some embodiments, each core segment has the same structure, and in each core segment: the center point of each guide groove and the center point of each set of internal channels of the core are deflected by a certain angle in the circumferential direction relative to the center line of the two adjacent sets of magnetic poles.

[0015] In some embodiments, the rotor core includes four core segments, which are assembled in a forward-reverse-backward sequence to form the V-shaped skew pole, the through slot, and the through hole.

[0016] In some embodiments, in each core segment: the center point of each guide groove and the center point of each set of internal channels of the core are deflected circumferentially relative to the center lines of the two adjacent sets of magnetic poles by an angle that is half of the rotor skew angle.

[0017] In some embodiments, the radial cross-section of the guide groove is formed in an arc shape, and / or the radial cross-section of the internal channel of the iron core is formed in an arc shape.

[0018] In some embodiments, the circumferential dimension of the internal channel of the iron core is larger than the circumferential dimension of the guide groove, and the guide channel extends radially outward from the inner circumference of the balance plate and gradually widens.

[0019] In some embodiments, the oil-slinging structure includes a through hole communicating with an internal channel of the iron core, and a guide wall extending axially from the through hole on the side near the outer periphery of the balance plate.

[0020] In some embodiments, the flow guide wall forms a semi-enclosed structure; the flow guide wall has an extension section inclined toward the outer periphery of the balance plate, and an oil-slinging section inclined from the tail end of the extension section toward the outer periphery of the balance plate.

[0021] In some embodiments, the oil-slinging structure is located at the radial center of the balance plate.

[0022] In some embodiments, the two balance plates have the same structure.

[0023] In some embodiments, the rotor shaft is provided with a shoulder, and of the two balance plates, one balance plate is limited by the shoulder, and the other balance plate is fixedly connected to the rotor shaft by a pressure ring.

[0024] According to another aspect of this application, an electric motor is provided, the motor being configured with a rotor assembly as described in any of the above embodiments.

[0025] The beneficial effects of this application compared to the prior art include at least the following:

[0026] This application constructs a cooling flow path that runs through the inside of the rotor core through the coordinated operation of the rotor shaft, rotor core, and two balance plates. This allows the cooling medium to be directly delivered to the concentrated heat-generating area of ​​the rotor core, achieving efficient cooling and significantly reducing rotor temperature rise.

[0027] This application utilizes the cooperation of two balance plates with the rotor core to create two sets of cooling flow paths in the rotor assembly. The flow path structure of each set is as follows: oil enters the rotor assembly through the inlet channel, flows through the diversion holes and guide grooves to one end face of the rotor core, flows through the guide channel of one balance plate and part of the internal channels of the core to the other end face of the rotor core, and is then ejected through the oil-throwing structure of the other balance plate. This achieves sufficient, multi-path cooling of the rotor core's interior.

[0028] This application breaks down the design of the cooling flow path into various components such as the rotor shaft, rotor core, and balance plate, simplifying the complexity of individual components, facilitating manufacturing and assembly, and improving the reliability of the rotor assembly.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0031] Figure 1 This diagram shows the overall structure of the rotor assembly in an embodiment of this application.

[0032] Figure 2 This diagram shows an exploded view of the rotor assembly in an embodiment of this application.

[0033] Figures 3 to 5 The diagram shows a cross-sectional view and a flow path diagram of the rotor assembly in an embodiment of this application, wherein... Figure 3 This shows the flow path structure between the rotor shaft and the rotor core. Figure 4 This shows a set of flow path structures between the rotor core and the balance plate. Figure 5 This shows another set of flow path structures between the rotor core and the balance plate;

[0034] Figure 6 This invention illustrates two sets of flow path structures between the rotor core and the balance plate in an embodiment of this application.

[0035] Figure 7 This diagram shows a radial cross-sectional view of the rotor shaft in an embodiment of this application.

[0036] Figure 8 This diagram shows a radial cross-sectional view of the rotor shaft and rotor core in an embodiment of this application.

[0037] Figure 9 A three-dimensional structural schematic diagram of the rotor core in an embodiment of this application is shown;

[0038] Figure 10 This diagram shows a front view of a single core segment in an embodiment of this application.

[0039] Figure 11 This diagram shows the reverse side structure of a single core segment in an embodiment of this application;

[0040] Figure 12 A schematic diagram of the front structure of the balance plate in an embodiment of this application is shown;

[0041] Figure 13A schematic diagram of the reverse side structure of the balance plate in an embodiment of this application is shown;

[0042] Figure 14 This diagram shows a cross-sectional view of the balance plate in an embodiment of this application. Detailed Implementation

[0043] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0044] The accompanying drawings are merely illustrative of this application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar structures, and therefore, repeated descriptions of them will be omitted.

[0045] The terms "first," "second," and similar words used in the specific description do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "positive," "negative," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application 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 on this application. The term "multiple" means two or more, unless otherwise explicitly specified. Furthermore, in the description of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two elements.

[0046] It should be noted that, unless otherwise specified, the embodiments of this application and the features in different embodiments can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0047] Figure 1 and Figure 2 The overall structure and disassembled structure of the rotor assembly in the embodiments of this application are illustrated respectively. See [link / reference]. Figure 1 and Figure 2 As shown, the rotor assembly provided in this application embodiment includes:

[0048] The rotor shaft 100 is provided with an oil inlet channel 110 and a diversion hole 120 that are connected to each other;

[0049] The rotor core 200 is sleeved on the rotor shaft 100 and is provided with a guide groove 210 communicating with the flow diversion hole 120. The guide groove 210 is formed on the inner surface of the rotor core 200. The rotor core 200 is also provided with a plurality of internal channels 220 spaced apart from the guide groove 210.

[0050] Two balance plates 300 are sleeved on the rotor shaft 100 and located at both ends of the rotor core 200. Each balance plate 300 is provided with a flow channel 310 that connects the flow channel 210 and a part of the internal channel 220 of the core, and an oil-throwing structure 320 that is spaced apart from the flow channel 310 and connects to another part of the internal channel 220 of the core.

[0051] During motor operation, the oil inlet channel 110 serves as the main inlet of the rotor cooling system, introducing the cooling medium into the rotating rotor assembly. The cooling medium can be lubricating oil or other suitable cooling media. The diversion hole 120 diverts the cooling medium from the oil inlet channel 110 to the rotor core 200. The guide groove 210 communicates with the diversion hole 120, receives the cooling medium from the rotor shaft 100, guides it to the end face of the rotor core 200, and further guides the cooling medium to the internal channel 220 of the rotor core 200 through the guide channel 310 of the balance plate 300. The guide channel 310 ensures a smooth transition of the cooling flow path at the component junction and avoids leakage of the cooling medium. The internal channel 220 of the core is spaced apart from the guide groove 210, forming a main cooling channel that runs through the axial direction of the rotor core 200, thereby guiding the cooling medium into the interior of the rotor core 200 to cool the concentrated heat-generating areas of the rotor core 200 (e.g., the area where the magnetic pole group 230 is located). The oil-throwing structure 320, which is spaced apart from the flow channel 310, provides an outlet for the cooling medium and uses the centrifugal force generated by the rotation of the rotor assembly to efficiently throw out the cooling medium that has completed heat exchange from inside the rotor.

[0052] This application constructs a cooling flow path that runs through the interior of the rotor core 200 through the coordinated operation of the rotor shaft 100, the rotor core 200, and two balance plates 300. This allows the cooling medium to be directly delivered to the concentrated heat-generating area of ​​the rotor core 200, achieving efficient cooling and significantly reducing rotor temperature rise.

[0053] This application breaks down the design of the cooling flow path into various components such as the rotor shaft 100, rotor core 200, and balance plate 300, simplifying the complexity of individual components, facilitating manufacturing and assembly, and improving the reliability of the rotor assembly.

[0054] This application utilizes the cooperation of two balance plates 300 with the rotor core 200 to form two sets of cooling flow paths in the rotor assembly. The flow path structure of each set of cooling flow paths is as follows: the oil enters the rotor assembly from the oil inlet channel 110, flows through the diversion hole 120 and the guide groove 210 to one end face of the rotor core 200, flows through the guide channel 310 of one balance plate 300 and part of the internal channel 220 of the core to the other end face of the rotor core 200, and is thrown out through the oil throwing structure 320 of the other balance plate 300. In this way, sufficient and multi-path cooling of the inside of the rotor core 200 is achieved.

[0055] Specifically, the flow process of the cooling medium in the two sets of cooling flow paths of the rotor assembly includes: See Figure 3 The schematic diagram illustrates the flow path structure between the rotor shaft 100 and the rotor core 200. The cooling medium enters through the oil inlet channel 110 of the rotor shaft 100, is ejected through the diversion hole 120 into the guide groove 210 of the rotor core 200, and further flows through the guide groove 210 to the two end faces of the rotor core 200, flowing into the guide channels 310 of the two balance plates 300; see also... Figure 4 The schematic diagram shows a flow path structure between the rotor core 200 and the balance plate 300, and Figure 6 The schematic diagram shows two sets of flow path structures between the rotor core 200 and the balance plate 300. The cooling medium flows through the guide channel 310 of the balance plate 300 located at the first end face 202a of the rotor core, enters part of the internal channel 220 of the rotor core 200, and passes through part of the internal channel 220 to reach the second end face 202b of the rotor core 200. Finally, it is thrown out by the oil-throwing structure 320 of the balance plate 300 located at the second end face 202b of the rotor core. See also... Figure 5 The schematic diagram shows another set of flow path structures between the rotor core 200 and the balance plate 300, and Figure 6 The schematic diagram shows two sets of flow path structures between the rotor core 200 and the balance plate 300. The cooling medium flows through the guide channel 310 of the balance plate 300 located on the second end face 202b of the rotor core, enters part of the internal channel 220 of the rotor core 200, passes through part of the internal channel 220 to reach the first end face 202a of the rotor core 200, and is finally thrown out by the oil throwing structure 320 of the balance plate 300 located on the first end face 202a of the rotor core.

[0056] By utilizing two sets of cooling flow paths, a bidirectional flow channel is formed inside the rotor assembly, which makes the temperature distribution of the rotor assembly more uniform in the axial direction, thereby improving the balance and reliability of the rotor assembly's thermal management.

[0057] See also Figure 1 and Figure 2As shown, in some embodiments, the rotor shaft 100 is formed as a hollow structure at one end 100a, thereby forming an oil inlet channel 110 extending along the axial direction Z inside it. By utilizing the integrally formed channel structure, the additional installation of external oil pipes is avoided, which simplifies the process, reduces manufacturing costs, and ensures the simplicity and efficiency of the cooling flow path.

[0058] Figure 7 The radial cross-sectional view of the rotor shaft 100 is shown. Figure 8 The radial cross-sectional view of the rotor shaft 100 and rotor core 200 is shown in the diagram. (See Figure 100) Figure 7 and Figure 8 As shown: In some embodiments, the diversion holes 120 penetrate the rotor shaft 100 radially X, allowing the cooling medium to enter the guide groove 210 of the rotor core 200 from the oil inlet channel 110 of the rotor shaft 100 along the shortest path. The diversion holes 120 may include multiple holes spaced apart circumferentially C, preferably evenly spaced along circumferentially C. Furthermore, the guide grooves 210 of the rotor core 200 are also evenly spaced along circumferentially C, but are not limited thereto, so that the cooling medium can be sprayed relatively evenly to all circumferential areas of the rotor core 200, laying the foundation for subsequent uniform cooling. The diversion holes 120 can be formed in multiple sets staggered along axially Z to avoid opening too many holes at the same axial position, which would affect the structural strength of the rotor shaft 100, effectively preventing stress concentration and improving the fatigue strength and critical speed of the rotor shaft 100.

[0059] In a specific example, the flow divider 120 comprises six evenly spaced flow dividers 120 along the circumferential direction C, such that every two flow dividers 120 are spaced 60 degrees apart in the circumferential direction C, and the six flow dividers 120 form two sets offset in the axial direction Z. Adjacent flow dividers 120 in each set are spaced 120 degrees apart in the circumferential direction C, and the two sets of flow dividers 120 are axially spaced 10 mm to 20 mm, for example, 15 mm, but not limited thereto. This axial spacing depends on the total length of the rotor and the number of core segments. Thus, in the circumferential direction C, oil supply uniformity is achieved, and it can precisely match common pole numbers (e.g., six sets of pole groups 230); in the axial direction Z, the appropriate distance between the two sets of flow dividers 120 maintains the structural strength of the rotor shaft 100.

[0060] See Figure 2As shown, in some embodiments, the number of guide slots 210 is equal to the number of diverter holes 120, wherein each diverter hole 120 connects to one guide slot 210; each guide channel 310 connects to one guide slot 210 and one core internal channel 220; each balance plate 300 includes multiple oil-throwing structures 320, and the number of core internal channels 220 is twice the number of oil-throwing structures 320 of each balance plate 300, so as to cooperate with two balance plates 300 respectively. Specifically, the number of slots in the cooling flow path can be set according to the number of magnetic pole groups 230 of the rotor core 200. Figure 2 , Figure 7 and Figure 8 As shown, in a specific example, the rotor core 200 is provided with six sets of magnetic pole groups 230; the flow divider holes 120 and the guide grooves 210 can each include six, and the internal channels 220 of the core can include six sets, each set including two internal channels 220 that cooperate with two balance plates 300; each balance plate 300 has six guide channels 310 and six oil slinger structures 320. Thus, the six sets of magnetic pole groups 230 can be adapted to the rotor core, achieving targeted and effective heat dissipation. The magnetic pole groups 230 are located near the outer circumference of the rotor core 200, and the internal channels 220 can be located close to the magnetic pole groups 230. During motor operation, the magnetic pole groups 230 are the main heat source of the rotor; by placing the internal channels 220 close to the magnetic pole groups 230, and with the number of internal channels 220 corresponding to the number of magnetic pole groups 230, two sets of cooling flow paths can be used to precisely cool the main heat-generating areas, effectively improving the working performance of the rotor assembly and the motor.

[0061] Figure 9 The diagram illustrates the three-dimensional structure of the rotor core 200, combined with... Figure 6 and Figure 9 As shown, in some embodiments, each set of magnetic poles 230 of the rotor core 200 is formed as a V-shaped slanted pole 230' along the axial direction Z. This enables the originally concentrated and synchronous torque fluctuations to be phase-shifted and superimposed to cancel each other out along the axial direction Z, thereby outputting a smoother average torque. This helps to reduce vibration and noise during motor operation, optimize the NVH (Noise, Vibration, Harshness) performance of the motor, and make the motor run more smoothly and quietly. In addition, the guide groove 210 of the rotor core 200 is formed as a straight groove 210' along the axial direction Z, and each internal channel 220 of the core is formed as a straight hole 220' along the axial direction Z, so that the cooling medium can flow unobstructed in the guide groove 210 and the internal channel 220 of the core, and avoids interference with the V-shaped slanted pole 230'.

[0062] Combination Figure 2 , Figure 6 and Figure 9As shown, in some embodiments, the internal channels 220 of the iron core include multiple sets, each set of internal channels 220 being disposed between adjacent magnetic pole groups 230; the rotor iron core 200 includes multiple iron core segments (200a, 200b, 200c, 200d), wherein the magnetic pole groups 230 of each iron core segment are connected along the Z-axis to form the magnetic pole group 230 of the rotor iron core 200, the guide grooves 210 of each iron core segment are connected along the Z-axis to form the guide grooves 210 of the rotor iron core 200, and the internal channels 220 of each iron core segment are connected along the Z-axis to form the internal channels 220 of the rotor iron core 200. Connecting multiple iron core segments (200a, 200b, 200c, 200d) to form the rotor iron core 200 facilitates the processing of the magnetic pole groups 230 and their mounting grooves, guide grooves 210, and internal channels 220, simplifying the structural complexity of a single iron core segment.

[0063] Figure 10 and Figure 11 The front and back structures of a single iron core segment are illustrated separately, combined with... Figure 2 , Figure 6 , Figures 9 to 11 As shown, in some embodiments, each core segment has the same structure, and in each core segment: the center point of each guide groove 210 and the center point of each set of internal channels 220 are deflected by a certain angle along the circumferential direction C relative to the center lines of the two adjacent sets of magnetic pole groups 230. For example, refer to Figure 10 As shown, viewed from the front, the center point of a guide channel 210 and the center point of a set of internal channels 220 of the iron core form a center line L1. This center line L1 is deflected by an angle θ clockwise relative to the center lines L2 of the corresponding two adjacent sets of magnetic pole groups 230. Then, referring to... Figure 11 As shown, viewed from the reverse side, the center line L1 connecting the center point of the guide groove 210 and the center point of the internal channel 220 of the core is deflected by an angle θ counterclockwise relative to the center line L2 of the corresponding two adjacent magnetic pole groups 230. Thus, when multiple core segments (200a, 200b, 200c, 200d) are assembled, the originally straight (extending along the Z-axis) magnetic pole group 230 can be made to exhibit a V-shaped inclined pole 230' by means of specific angle deflection, forward / reverse assembly, etc., while the originally straight (extending along the Z-axis) guide groove 210 and the internal channel 220 of the core maintain axially extending straight grooves 210' and straight holes 220'. This facilitates the manufacturing of core segments, and only one type of sheet-shaped core segment is needed to simultaneously form the V-shaped inclined pole 230', straight groove 210', and straight hole 220', significantly reducing process complexity and overall cost.

[0064] Continue to combine Figure 2 , Figure 6 , Figures 9 to 11As shown, in some embodiments, the rotor core 200 includes four core segments (200a, 200b, 200c, 200d), which are assembled in a reverse order, i.e., the first core segment 200a is mounted upright, the second core segment 200b is mounted in reverse, the third core segment 200c is mounted in reverse, and the fourth core segment 200d is mounted upright, to form a symmetrical V-shaped slanted pole 230', which can compensate for magnetic field harmonics to the maximum extent and optimize electromagnetic performance; at the same time, a straight groove 210' and a straight hole 220' are formed to ensure the unobstructed cooling flow path.

[0065] In some embodiments, the center point of each guide groove 210 and the center point of each set of core internal channels 220 are deflected circumferentially relative to the center lines of the corresponding two adjacent sets of magnetic pole groups 230 by an angle that is half the rotor skew angle. Thus, when multiple core segments (200a, 200b, 200c, 200d) are assembled, a V-shaped skew pole 230' with the optimal angle can be formed, enabling the rotor core 200 to achieve the best electromagnetic performance improvement effect; at the same time, it ensures that the guide grooves 210 and the core internal channels 220 have optimal axial straightness, achieving the best cooling channel design.

[0066] In some embodiments, the radial cross-section of the guide groove 210 is formed in an arc shape, and / or the radial cross-section of the internal channel 220 of the iron core is formed in an arc shape to guide the cooling medium to flow smoothly. Furthermore, with the same cross-sectional area, the arc-shaped internal channel 220 of the iron core has a larger contact area (i.e., heat exchange area) with the rotor iron core 200, thereby improving heat exchange efficiency; and the arc-shaped internal channel 220 of the iron core removes less material than a conventional circular hole, thus preserving the structural integrity of the rotor iron core 200 to a greater extent, resulting in higher mechanical strength of the rotor iron core 200 and the ability to withstand higher rotational speeds.

[0067] Figure 12 The diagram illustrates the front structure of the balance plate 300, combined with... Figure 2 and Figure 12 As shown, in some embodiments, the circumferential dimension of the internal channel 220 of the iron core is larger than that of the guide groove 210, resulting in a larger contact area and better heat exchange effect between the internal channel 220 of the iron core and the concentrated heat-generating area of ​​the rotor iron core 200. The guide channel 310 extends radially outward from the inner circumference of the balance plate 300 and gradually widens. That is, the circumferential position and width of the end of the guide channel 310 that communicates with the guide groove 210 and the end that communicates with the internal channel 220 of the iron core are different, so as to connect the guide groove 210 and the internal channel 220 of the iron core, allowing the cooling medium to enter the internal channel 220 of the iron core more smoothly and fully.

[0068] Figure 13 and Figure 14 The reverse and cross-sectional structures of the balance plate 300 are shown respectively, combined with... Figure 2 , Figures 12 to 14 As shown, in some embodiments, the oil-throwing structure 320 includes a through hole 321 communicating with the internal channel 220 of the iron core, and a guide wall 322 extending axially from the through hole 321 on one side near the outer periphery of the balance plate 300. The guide wall 322 guides the cooling medium flowing out of the through hole 321, controlling the flow direction and throwing angle of the cooling medium, effectively reducing oil churning losses of the cooling medium in the rotor cavity, and improving the efficiency of the motor.

[0069] In some embodiments, the guide wall 322 forms a semi-enclosed structure to collect and constrain the cooling medium, ensuring that the cooling medium is thrown out in the desired direction. The guide wall 322 has an extension 322a inclined towards the outer periphery of the balance plate 300, forming a guiding surface that matches the direction of the centrifugal force, allowing the cooling medium to flow closely against the wall of the extension 322a under centrifugal force. The guide wall 322 also includes an oil-throwing section 322b inclined from the tail end of the extension 322a towards the outer periphery of the balance plate 300, used for final guidance of the cooling medium, smoothly throwing the cooling medium out at a better angle, improving oil-throwing efficiency and reducing oil churning loss. The inclination angles of the extension 322a and the oil-throwing section 322b can be set as needed, for example, the extension 322a is inclined at 10 to 20 degrees relative to the axial direction Z, and the oil-throwing section 322b is inclined at 45 to 60 degrees relative to the axial direction Z, but is not limited thereto.

[0070] Continue to combine Figure 2 , Figures 12 to 14 As shown, in some embodiments, the oil-throwing structure 320 is located in the radial center of the balance plate 300. Compared with oil-throwing using the outer diameter, this can effectively reduce the oil-throwing speed, thereby reducing oil churning losses. In addition, it can effectively avoid the balancing area on the outer diameter of the balance plate 300 that requires balancing holes, allowing dynamic balancing operations to be performed independently without interference, thus simplifying the process.

[0071] In some embodiments, the two balance plates 300 have the same structure, so only one type of balance plate 300 needs to be manufactured and installed at both ends of the rotor core 200 in a mirror-like manner, which significantly reduces manufacturing and assembly costs.

[0072] Furthermore, in some embodiments, the rotor shaft 100 is provided with a shoulder 140, and of the two balance plates 300, one balance plate 300 is limited by the shoulder 140, and the other balance plate 300 is fixedly connected to the rotor shaft 100 through a pressure ring 400, thus ensuring the tightness and stability of the entire rotor assembly and preventing axial movement under high-speed rotation and electromagnetic force.

[0073] This application also provides an electric motor equipped with a rotor assembly as described in any of the above embodiments, which can achieve similar technical effects to the rotor assembly, including but not limited to: excellent heat dissipation capacity to continuously output higher power, while achieving smaller size and longer life; high rotor mechanical strength, enabling higher speeds; the use of V-shaped skewed poles and other technologies to achieve better electromagnetic performance (such as torque smoothness, noise level, etc.); low manufacturing cost and high reliability.

[0074] The motor described in this application is particularly suitable for applications with stringent requirements for performance, efficiency, and cost, such as drive motors for new energy vehicles and servo motors for high-end industries.

[0075] Finally, it should be noted that the above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A rotor assembly, characterized in that, include: The rotor shaft is equipped with a connected oil inlet channel and a flow divider hole; The rotor core is sleeved on the rotor shaft and has a guide groove that communicates with the flow divider hole. The guide groove is formed on the inner surface of the rotor core. The rotor core also has a plurality of internal channels that are spaced apart from the guide groove. Two balance plates are sleeved on the rotor shaft and located at both ends of the rotor core. Each balance plate is provided with a flow channel that connects the flow guide groove and a part of the internal channel of the core, and an oil-throwing structure that is spaced apart from the flow guide channel and connects to another part of the internal channel of the core.

2. The rotor assembly as claimed in claim 1, characterized in that, The rotor assembly includes two sets of cooling flow paths, each set of cooling flow paths forming the following flow path structure: The oil enters the rotor assembly through the inlet channel, flows through the diversion hole and the guide groove to one end face of the rotor core, flows through the guide channel of a balance plate and part of the internal channel of the core to the other end face of the rotor core, and is thrown out by the oil throwing structure of another balance plate.

3. The rotor assembly as described in claim 1, characterized in that, The rotor shaft is formed as a hollow structure at one end to form the axially extending oil inlet channel inside.

4. The rotor assembly as claimed in claim 1, characterized in that, The flow divider hole radially penetrates the rotor shaft; The diversion holes include multiple circumferentially spaced holes that form multiple sets that are axially staggered.

5. The rotor assembly as described in claim 4, characterized in that, The diversion holes include six circumferentially evenly spaced holes that form two axially staggered groups. Each group of diversion holes is circumferentially spaced 120 degrees apart from adjacent diversion holes, and the two groups of diversion holes are axially spaced 10 mm to 20 mm apart.

6. The rotor assembly as claimed in claim 1, characterized in that, The number of the flow guide channels is equal to the number of the flow splitting holes, wherein each flow splitting hole is connected to one flow guide channel; Each flow channel connects a flow channel and an internal channel of the iron core; Each balance plate includes multiple oil-throwing structures, and the number of internal channels of the iron core is twice the number of oil-throwing structures in each balance plate.

7. The rotor assembly as claimed in claim 6, characterized in that, The rotor core is provided with six sets of magnetic poles; The flow diversion hole and the flow guide groove each include six, and the internal channel of the iron core is arranged close to the magnetic pole group. The internal channel of the iron core includes six groups, wherein each group includes two internal channels of the iron core that cooperate with two balance plates respectively. Each balance plate has six flow channels and six oil-throwing structures.

8. The rotor assembly as claimed in claim 1, characterized in that, The rotor core is provided with multiple sets of magnetic pole groups, wherein each set of magnetic pole groups is formed as a V-shaped oblique pole along the axial direction. The guide groove is formed as a straight groove along the axial direction, and the internal channel of each iron core is formed as a straight hole along the axial direction.

9. The rotor assembly as claimed in claim 8, characterized in that, The internal channels of the iron core include multiple sets, and each set of internal channels of the iron core is arranged between adjacent magnetic pole sets; The rotor core includes multiple core segments, wherein the magnetic pole groups of each core segment are axially connected to form the magnetic pole groups of the rotor core, the guide grooves of each core segment are axially connected to form the guide grooves of the rotor core, and the internal channels of each core segment are axially connected to form the internal channels of the rotor core.

10. The rotor assembly as claimed in claim 9, characterized in that, Each core segment has the same structure. In each core segment, the center point of each guide groove and the center point of each set of internal channels of the core are deflected by a certain angle in the circumferential direction relative to the center line of the two adjacent sets of magnetic poles.

11. The rotor assembly as claimed in claim 10, characterized in that, The rotor core comprises four core segments, which are assembled in a forward-reverse-backward sequence to form the V-shaped skew pole, the straight slot, and the straight hole.

12. The rotor assembly as claimed in claim 10, characterized in that, In each core segment: the center point of each guide groove and the center point of each set of internal channels of the core are deflected circumferentially relative to the center lines of the two adjacent sets of magnetic poles by an angle that is half the rotor skew angle.

13. The rotor assembly as claimed in claim 1, characterized in that, The radial cross-section of the guide groove is formed in an arc shape, and / or the radial cross-section of the internal channel of the iron core is formed in an arc shape.

14. The rotor assembly as claimed in claim 1, characterized in that, The circumferential dimension of the internal channel of the iron core is larger than the circumferential dimension of the guide groove. The guide channel extends radially outward from the inner circumference of the balance plate and gradually widens.

15. The rotor assembly as claimed in claim 1, characterized in that, The oil-slinging structure includes a through hole communicating with the internal channel of the iron core, and a guide wall extending axially from the side of the through hole near the outer periphery of the balance plate.

16. The rotor assembly as claimed in claim 15, characterized in that, The flow guide wall forms a semi-enclosed structure; The guide wall has an extension section that slopes toward the outer periphery of the balance plate, and an oil-slinging section that slopes toward the outer periphery of the balance plate from the tail end of the extension section.

17. The rotor assembly as claimed in claim 1, characterized in that, The oil-slinging structure is located in the radial center of the balance plate.

18. The rotor assembly as claimed in claim 1, characterized in that, The two balance plates have the same structure.

19. The rotor assembly as claimed in claim 1, characterized in that, The rotor shaft is provided with a shoulder, and among the two balance plates: One balance plate is limited by the shoulder platform, and the other balance plate is fixedly connected to the rotor shaft by a pressure ring.

20. An electric motor, characterized in that, The motor is equipped with a rotor assembly as described in any one of claims 1 to 19.

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