Electric machine rotor, electric machine and electric drive system

Abstract

The application provides a motor rotor, a motor and an electric drive system. The motor rotor comprises: a rotating shaft provided with a first flow channel and a plurality of second flow channels located in the axial middle region of the rotating shaft; and annular laminations which are sleeved on the rotating shaft and stacked with each other, comprising: two groups of annular inner wall grooved laminations which are arranged on both sides of the plurality of second flow channels in the axial direction, the grooves of each group of the grooved laminations form third flow channels which are in communication with part of the second flow channels, and the two groups of third flow channels uniformly distribute the plurality of second flow channels; and two groups of annular end face through hole laminations which are arranged on both sides of the two groups of the grooved laminations in the axial direction, the through holes of each group of the through hole laminations form fourth flow channels which are in communication with one group of the third flow channels, and the two groups of fourth flow channels respectively extend to the two end faces of the motor rotor. The application constructs the internal flow channels of the motor rotor which uniformly throw oil at both ends through the laminations and the rotating shaft, and realizes balanced and reliable cooling of key components such as the magnetic poles at both ends of the motor rotor and the windings at both ends of the motor stator.

Description

Technical Field

[0001] This application relates to the field of automotive parts technology, and more specifically, to motor rotors, motors, and electric drive systems. Background Technology

[0002] Traditional electric motor rotors have end plates at both ends, which can be used to participate in the construction of the rotor's cooling channels. (See reference...) Figure 1 As shown, the common internal flow channels of rotors (indicated by arrows) consist of: an oil inlet 110 at the shaft end, and two sets of oil passages 120 in the inner cavity of the shaft, corresponding to the end plates 130 at both ends. As the rotor rotates, the cooling oil can be thrown out through the cooling flow channels indicated by arrows and sprayed onto the ends of the stator windings to achieve cooling of the stator windings.

[0003] The main problem with the existing design is that the distances between the two sets of oil passages 120 and the oil inlet 110 are not equal, which can easily lead to uneven flow. In addition, adding an end plate 130 to participate in the cooling channel construction will increase the complexity and cost of the rotor.

[0004] 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

[0005] This application provides an electric motor rotor, an electric motor, and an electric drive system. By cooperating with the laminations and the shaft, an internal flow channel for uniform oil discharge can be constructed at both ends of the rotor without the need for end plates.

[0006] According to one aspect of this application, a motor rotor is provided, comprising: a shaft having a first flow channel and a plurality of second flow channels communicating with the first flow channel, the plurality of second flow channels being located in the axial central region of the shaft; and an annular laminations sleeved on the shaft and stacked on top of each other, comprising: two sets of laminations with grooves on the inner wall of the annulus, arranged axially on both sides of the plurality of second flow channels, wherein the grooves of each set of laminations form a third flow channel communicating with a portion of the second flow channels, and the two sets of third flow channels uniformly distribute the flow in the plurality of second flow channels; and two sets of laminations with through holes on the annular end faces, arranged axially on both sides of the two sets of laminations with grooves, wherein the through holes of each set of laminations form a fourth flow channel communicating with a set of third flow channels, and the two sets of fourth flow channels respectively extend to two end faces of the motor rotor.

[0007] In some embodiments, the arrangement of the rotating shaft satisfies any of the following conditions: the first flow channel extends axially; the plurality of second flow channels extend radially respectively; and the plurality of second flow channels are evenly distributed at intervals in the circumferential direction.

[0008] In some embodiments, the two sets of third flow channels and the two sets of fourth flow channels are respectively rotationally symmetric about the plurality of second flow channels, and / or the axial projections of the two sets of third flow channels and the axial projections of the two sets of fourth flow channels are respectively formed as rotationally symmetric structures.

[0009] In some embodiments, the number of the plurality of second channels is P, and the number of channels in each group of the third channel and each group of the fourth channel is P / 2, where P is the number of magnetic pole pairs.

[0010] In some embodiments, the laminations with the grooves are of the same type, wherein each lamination with the grooves is provided with P / 2 grooves, and there is a 360° / p phase difference between the two sets of laminations with the grooves.

[0011] In some embodiments, the through-hole comprises multiple through-holes with different pitch circles, each of the fourth flow channels extends obliquely, and each group of the fourth flow channels is formed in a radial structure.

[0012] In some embodiments, the lamination with the groove and the lamination with the through hole are two different types of laminations.

[0013] In some embodiments, the lamination includes a first type of lamination and a second type of lamination, the first type of lamination having the groove and a partial through hole, and the second type of lamination having a partial through hole; wherein the through hole of the second type of lamination is connected to the third flow channel, and the through hole of the first type of lamination is connected to the through hole of the second type of lamination.

[0014] In some embodiments, each of the first type of laminations is provided with a first group of through holes and a second group of through holes, and each of the second type of laminations is provided with a third group of through holes and a fourth group of through holes. The pitch circles of the first group of through holes, the second group of through holes, the third group of through holes and the fourth group of through holes decrease in sequence. The fourth group of through holes, the third group of through holes, the second group of through holes and the first group of through holes are arranged sequentially from the third flow channel to the end face of the motor rotor.

[0015] In some embodiments, each of the laminations is further provided with a magnetic pole receiving groove on its annular end face.

[0016] According to another aspect of this application, an electric motor is provided, the electric motor being configured with a motor rotor as described in any of the above embodiments.

[0017] In some embodiments, the motor is a permanent magnet synchronous motor, an asynchronous motor, or an electrically excited synchronous motor.

[0018] According to another aspect of this application, an electric drive system is provided, the electric drive system being configured with a motor as described in any of the above embodiments.

[0019] The beneficial effects of this application compared to the prior art include at least the following:

[0020] The first flow channel guides the cooling medium into the rotating shaft; multiple second flow channels are located in the axial middle region of the rotating shaft, which facilitates the uniform distribution of the cooling medium to the two end faces of the motor rotor. Annular laminations, sleeved on the rotating shaft and stacked on top of each other, form the core of the motor rotor. Two sets of third flow channels formed by the laminations evenly distribute the cooling medium to the multiple second flow channels, and two sets of fourth flow channels guide the cooling medium to the two end faces of the motor rotor, achieving uniform distribution and inclined spraying of the cooling medium.

[0021] Therefore, the motor rotor of this application constructs an internal flow channel with uniform oil discharge at both ends through laminations and a rotating shaft. Without the need for additional parts, it achieves efficient, balanced, and reliable cooling of key components such as the magnetic poles at both ends of the motor rotor and the windings at both ends of the motor stator through a simple structure and low cost.

[0022] 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

[0023] 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.

[0024] Figure 1 This diagram shows the internal flow channel structure of an existing motor rotor.

[0025] Figure 2 This document shows a schematic diagram of the motor rotor in an embodiment of this application.

[0026] Figure 3 This invention provides a schematic diagram of the internal flow channel of the motor rotor in an embodiment of this application.

[0027] Figure 4 and Figure 5 This invention provides a schematic diagram of the structure of the motor rotor shaft in an embodiment of this application.

[0028] Figure 6 and Figure 7 This is a schematic diagram of the structure of the laminations of the motor rotor in an embodiment of this application. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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 "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship 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.

[0032] 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.

[0033] Figure 2 The structure of the motor rotor in the embodiment of this application is illustrated. Figure 3 The diagram illustrates the structure of the internal flow channel of the motor rotor in an embodiment of this application. Figure 4 and Figure 5 The diagram illustrates the structure of the motor rotor shaft in an embodiment of this application. Figure 6 and Figure 7 The diagram illustrates the structure of the laminations of the motor rotor in the embodiments of this application; combined with Figure 2 and Figure 7 As shown, the motor rotor provided in this embodiment includes:

[0034] The rotating shaft 200 is provided with a first flow channel C1 and a plurality of second flow channels C2 connected to the first flow channel C1. The plurality of second flow channels C2 are located in the axial middle region of the rotating shaft 200.

[0035] The annular laminations (300, 400) are sleeved on the rotating shaft 200 and stacked on top of each other, including:

[0036] Two sets of laminations with grooves 311 on the annular inner wall 310 are arranged on both sides of multiple second flow channels C2 along the axial direction Z. The grooves 311 of each set of laminations with grooves 311 form a third flow channel C3 that communicates with part of the second flow channel C2, and the two sets of third flow channels C3 evenly distribute the multiple second flow channels C2.

[0037] Two sets of laminations with through holes (321, 322, 411, 412) on the annular end face (320, 410) are arranged along the axial direction Z on both sides of the two sets of laminations with grooves 311. The through holes (321, 322, 411, 412) of each set of laminations form a fourth flow channel C4 that communicates with a set of third flow channels C3. The two sets of fourth flow channels C4 extend to the two end faces (S1, S2) of the motor rotor, respectively.

[0038] The first flow channel C1 guides the cooling medium (e.g., cooling oil, or other suitable insulating cooling medium) into the shaft 200. Multiple second flow channels C2 are positioned in the axial central region of the shaft 200, facilitating the uniform distribution of the cooling medium to the two end faces (S1, S2) of the motor rotor (the third flow channel C3 and the fourth flow channel C4). The axial central region of the shaft 200 includes the physical center of the shaft 200 and its vicinity, where a roughly uniform flow distribution can be achieved. That is, the positions of the multiple second flow channels C2 are configured to ensure a substantially balanced flow of the cooling medium to the two end faces (S1, S2).

[0039] The core of the motor rotor is formed by annular laminations (300, 400) that are sleeved on and stacked on the rotating shaft 200, which can achieve uniform distribution and inclined spraying of the cooling medium without the need for end plates. Specifically, two sets of third flow channels C3 formed by the grooves 311 of two sets of laminations with grooves 311 are used to evenly distribute the cooling medium to multiple second flow channels C2; the two sets of third flow channels C3 can be connected to the same number or the same capacity of second flow channels C2, so that the cooling medium is distributed approximately equally to both sides of the axial direction of the core by the two sets of third flow channels C3. Two sets of fourth flow channels C4 formed by the through holes (321, 322, 411, 412) of two sets of laminations with through holes (321, 322, 411, 412) are used to guide the cooling medium to two end faces (S1, S2).

[0040] The design of the groove 311 located on the annular inner wall 310 of the lamination and the through holes (321, 322, 411, 412) located on the annular end face (320, 410) of the lamination also allows the flow channels leading to the two end faces (S1, S2) of the motor rotor to extend at an angle, which facilitates the use of centrifugal force to throw out the cooling medium when the motor rotor rotates, realizing inclined spraying, so that the cooling medium is delivered to the areas of the motor that need the most cooling (magnetic poles 360 of the motor rotor, windings of the motor stator, etc.), thereby achieving efficient heat exchange.

[0041] Therefore, the motor rotor of this application, through laminations (300, 400) and shaft 200, constructs an internal flow channel with uniform oil discharge at both ends (internal flow channel reference). Figure 3 (As shown by the dashed arrow in the middle), without the need for additional parts, it achieves efficient, balanced, and reliable cooling of key components such as the magnetic poles 360 at both ends of the motor rotor and the windings at both ends of the motor stator through a simple structure and low cost.

[0042] In some embodiments, the arrangement of the rotating shaft 200 satisfies any of the following conditions: the first flow channel C1 extends along the axial direction Z to facilitate the introduction of cooling medium and to keep the structure of the rotating shaft 200 stable during operation, which is also beneficial to the machining and forming of the rotating shaft 200; the multiple second flow channels C2 extend radially to facilitate the distribution of cooling medium to the iron core, and at the same time further keep the structure of the rotating shaft 200 stable during operation, which is also beneficial to the machining and forming of the rotating shaft 200; the multiple second flow channels C2 are evenly distributed in the circumferential direction to further ensure the uniform distribution of cooling medium and help to achieve uniform flow distribution of the two sets of third flow channels C3.

[0043] In some embodiments, the two sets of third flow channels C3 and the two sets of fourth flow channels C4 are respectively rotationally symmetrical about the plurality of second flow channels C2, ensuring that the cooling medium is uniformly delivered to both sides of the iron core along the axial direction; and / or, in some embodiments, the axial projections of the two sets of third flow channels C3 and the axial projections of the two sets of fourth flow channels C4 are respectively formed as rotationally symmetrical structures, ensuring uniform and reliable cooling of key components such as the magnetic poles 360 at both ends of the motor rotor and the windings at both ends of the motor stator in the circumferential direction. The annular end face (320, 410) of each lamination (300, 400) may be provided with a magnetic pole receiving groove (323, 413) for mounting the magnetic pole 360.

[0044] In some embodiments, the number of cooling channels C2 is P, and the number of channels in each group of third channels C3 and each group of fourth channels C4 is P / 2, where P is the number of pole pairs. This matches the number of cooling channels on the motor rotor with the number of pole pairs, achieving a more optimized cooling path design.

[0045] In some embodiments, the laminations with grooves 311 are of the same type (see reference). Figure 6The first type of lamination 300 shown has each lamination with groove 311 having P / 2 grooves 311, and there is a 360° / p phase difference between the two sets of laminations with grooves 311, which realizes the splitting of cooling channels on both sides of the iron core.

[0046] For example, refer to Figure 2 As shown, the motor has six pole pairs; therefore, referring to... Figure 5 As shown, the rotating shaft 200 can be equipped with six second flow channels C2; see reference Figure 6 and Figure 3 As shown, each lamination with a groove 311 has three grooves 311, so that each group of third flow channels C3 includes three. During assembly, three second flow channels C2 correspond to one group of laminations with grooves 311, and another three second flow channels C2 correspond to another group of laminations with grooves 311 rotated by 60°. Furthermore, combined with... Figure 2 and Figure 3 As shown, each group of fourth flow channels C4 also has three flow channels, and each group of fourth flow channels C4 forms a cooling flow channel outlet C corresponding to half of the magnetic poles 360 on one end face of the motor rotor. out .

[0047] In other embodiments, the number of pole pairs of the motor is not limited to six pairs; it can be an arbitrary pole motor.

[0048] Continue to combine Figures 2 to 7 As shown, in some embodiments, the through holes (321, 322, 411, 412) include multiple through holes with different pitch circles, so that each fourth flow channel C4 extends obliquely, and each group of fourth flow channels C4 is formed into a radial structure, which facilitates the cooling medium to be thrown out along the fourth flow channel C4 under the action of centrifugal force, thereby improving cooling accuracy and efficiency.

[0049] In some embodiments, the lamination with groove 311 and the lamination with through holes (321, 322, 411, 412) are two different types of laminations. This facilitates manufacturing and assembly, as one type of lamination is machined only with groove 311 and the other type of lamination is machined only with through holes (321, 322, 411, 412), improving process feasibility and facilitating standardized production and quality control.

[0050] In some embodiments, considering that machining too many through holes on a single lamination may affect structural strength and ease of machining, the through holes (321, 322, 411, 412) can be distributed across two types of laminations to enhance reliability. Specifically, the laminations (300, 400) may include... Figure 6 The first type of lamination 300 shown and Figure 7The second type of lamination 400 shown has a groove 311 and partial through holes (321, 322) in the first type of lamination 300, and partial through holes (411, 412) in the second type of lamination 400; wherein, the through holes (411, 412) of the second type of lamination 400 are connected to the third flow channel C3, and the through holes (321, 322) of the first type of lamination 300 are connected to the through holes (411, 412) of the second type of lamination 400, forming a continuous cooling flow channel.

[0051] Furthermore, when the laminations (300, 400) include a first type of lamination 300 and a second type of lamination 400: each first type of lamination 300 is provided with a first group of through holes 321 and a second group of through holes 322, and each second type of lamination 400 is provided with a third group of through holes 411 and a fourth group of through holes 412. The pitch circles of the first group of through holes 321, the second group of through holes 322, the third group of through holes 411 and the fourth group of through holes 412 decrease sequentially. The fourth group of through holes 412, the third group of through holes 411, the second group of through holes 322 and the first group of through holes 321 are sequentially arranged from the third flow channel C3 to the end face (S1, S2) of the motor rotor. In this way, the through holes are arranged in a decreasing pitch circle to form an inclined radial fourth flow channel C4, which optimizes the flow path of the cooling medium and facilitates the cooling medium to be sprayed out under the action of centrifugal force, thereby improving the cooling efficiency.

[0052] This application also provides an electric motor configured with a motor rotor as described in any of the above embodiments. Using the aforementioned rotor structure, the motor can achieve efficient and uniform cooling, improving overall performance and reliability, and extending its service life. Specifically, the motor can be any suitable motor such as a permanent magnet synchronous motor, an asynchronous motor, or an electrically excited synchronous motor.

[0053] This application also provides an electric drive system equipped with the aforementioned motor, which possesses efficient and uniform cooling capabilities, thereby improving overall performance and reliability and extending service life. The motor described in this application can also be applied to other vehicle systems, such as seat systems, air conditioning systems (for enhancing the driving experience), or braking systems, seatbelt systems (for ensuring driving safety and stability), and so on.

[0054] 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 motor rotor, characterized in that, include: A rotating shaft is provided with a first flow channel and a plurality of second flow channels communicating with the first flow channel, the plurality of second flow channels being located in the axial middle region of the rotating shaft; The annular laminations, sleeved on the rotating shaft and stacked on top of each other, include: Two sets of laminations with grooves on the inner wall of the ring are arranged axially on both sides of the plurality of second flow channels, wherein the grooves of each set of laminations form a third flow channel that communicates with part of the second flow channel, and the two sets of third flow channels evenly divide the plurality of second flow channels. Two sets of laminations with through holes on the annular end face are arranged axially on both sides of the two sets of laminations with grooves. The through holes of each set of laminations with through holes form a fourth flow channel that communicates with a third flow channel. The two sets of fourth flow channels extend to the two end faces of the motor rotor, respectively.

2. The motor rotor as described in claim 1, characterized in that, The setting of the rotating shaft satisfies any of the following conditions: The first flow channel extends axially; The plurality of second flow channels extend radially, respectively; The plurality of second channels are evenly distributed at intervals in the circumferential direction.

3. The motor rotor as described in claim 1, characterized in that, The two sets of third flow channels and the two sets of fourth flow channels are respectively rotationally symmetrical about the plurality of second flow channels, and / or the axial projections of the two sets of third flow channels and the axial projections of the two sets of fourth flow channels are respectively formed as rotationally symmetrical structures.

4. The motor rotor as described in claim 1, characterized in that, The number of the plurality of second flow channels is P, and the number of the third flow channels in each group and the fourth flow channels in each group is P / 2, where P is the number of magnetic pole pairs.

5. The motor rotor as described in claim 4, characterized in that, The laminations with the grooves are of the same type, wherein each lamination with the grooves has P / 2 grooves, and there is a 360° / p phase difference between the two sets of laminations with the grooves.

6. The motor rotor as described in claim 1, characterized in that, The through-holes include multiple through-holes with different pitch circles, each of the fourth flow channels extends obliquely, and each group of the fourth flow channels is formed in a radial structure.

7. The motor rotor as described in claim 1, characterized in that, The lamination with the groove and the lamination with the through hole are two different types of laminations.

8. The motor rotor as described in claim 1, characterized in that, The lamination includes a first type of lamination and a second type of lamination. The first type of lamination has the groove and a partial through hole, and the second type of lamination has a partial through hole. The through hole of the second type of lamination is connected to the third flow channel, and the through hole of the first type of lamination is connected to the through hole of the second type of lamination.

9. The motor rotor as described in claim 8, characterized in that, Each of the first type of laminations is provided with a first group of through holes and a second group of through holes, and each of the second type of laminations is provided with a third group of through holes and a fourth group of through holes, wherein the pitch circles of the first group of through holes, the second group of through holes, the third group of through holes and the fourth group of through holes decrease in sequence. The fourth group of through holes, the third group of through holes, the second group of through holes, and the first group of through holes are arranged sequentially from the third flow channel toward the end face of the motor rotor.

10. The motor rotor as described in any one of claims 1 to 9, characterized in that, Each of the laminations also has a magnetic pole receiving groove on its annular end face.

11. An electric motor, characterized in that, It is equipped with a motor rotor as described in any one of claims 1 to 10.

12. The motor as described in claim 11, characterized in that, The motor is a permanent magnet synchronous motor, an asynchronous motor, or an electrically excited synchronous motor.

13. An electric drive system, characterized in that, It is equipped with the motor as described in claim 11 or 12.

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