Rotor assembly and electric machine having the same

Abstract

The application discloses a rotor assembly and a motor with the same, and relates to the technical field of motors. The rotor assembly comprises a rotor core and a rotating shaft, the rotor core is sleeved outside the rotating shaft, the rotor core comprises a plurality of rotor lamination groups stacked in the axial direction, each rotor lamination group is provided with a plurality of magnetic steel slot groups arranged in the circumferential direction at intervals, the structures of the magnetic steel slots in the magnetic steel slot groups in at least two rotor lamination groups are different, the rotor core is provided with a first rotor oil path and a second rotor oil path arranged in parallel, the first rotor oil path comprises a plurality of first oil cooling channels, the first oil cooling channels are located between two adjacent magnetic steel slot groups, the second rotor oil path comprises a plurality of second oil cooling channels, and the second oil cooling channels are formed in communication by extension portions of the magnetic steel slots. The motor comprises the rotor assembly. The application can increase the heat exchange efficiency of the rotor core, reduce the temperature of the rotor assembly, improve the reliability of the motor during operation and the cost performance.

Description

Technical Field

[0001] This application belongs to the field of automotive parts technology, and relates to the field of motor technology, and particularly to a rotor assembly and a motor having the same. Background Technology

[0002] In recent years, facing the environmental pollution caused by vehicle exhaust, the country has imposed increasingly stringent emission requirements, especially in the automotive sector. As a result, new energy vehicles have emerged to replace traditional internal combustion engine vehicles. As the core drive component of new energy vehicles, the operating efficiency and cost-effectiveness of the drive motor have attracted much attention, with the cooling method being particularly crucial to its efficiency and cost-effectiveness.

[0003] With the current trend of multi-functional new energy drive systems, oil-cooled motors are gradually becoming mainstream. Most existing oil-cooling technologies focus on the stator core and end windings; however, with the increasing speed of drive motors, the temperature of the rotor core has also become a key concern. Lowering the rotor core temperature not only allows for the reduction of magnet grades and quantities, thus reducing the strength risks to the rotor structure at high speeds, but also helps to reduce the material costs of the drive motor.

[0004] In related technologies, some oil-cooled motor heat dissipation structures have a two-way heat dissipation path. One path is through the stator core to the stator windings, and the other is through the shaft to the end of the rotor core and stator windings. The latter involves a linear oil passage from the shaft through the rotor core to dissipate heat to the rotor. However, this structure is simple but has poor rotor cooling effect and low efficiency. To improve the poor rotor oil passage cooling effect, other oil-cooled motor heat dissipation structures in related technologies use a U-shaped rotor oil passage. This structure increases the length of the oil passage on the rotor, theoretically providing some benefit to rotor cooling. However, the narrow oil passage structure on the rotor, especially the end oil passage guide structure, significantly increases the pressure loss of the oil passage, placing higher demands on the oil pump and reducing the cooling effect, indicating room for improvement. Summary of the Invention

[0005] This application aims to at least partially solve one of the aforementioned technical problems. To this end, this application proposes a rotor assembly and a motor having the same, which can alleviate the problem of poor heat dissipation in current rotor oil circuit structures and improve heat dissipation efficiency.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] According to one aspect of this application, a rotor assembly is provided, comprising: a rotor core and a shaft, the rotor core being sleeved on the outside of the shaft;

[0008] The rotor core includes multiple rotor lamination groups stacked along the axial direction. Each rotor lamination group is provided with multiple magnetic slot groups arranged at intervals along the circumferential direction. The magnetic slots in the magnetic slot groups of at least two rotor lamination groups have different structures.

[0009] The rotor core is provided with a first rotor oil passage and a second rotor oil passage arranged in parallel. The first rotor oil passage includes a plurality of first oil cooling channels, which are located between two adjacent magnetic steel slot groups. The second rotor oil passage includes a plurality of second oil cooling channels, which are formed by connecting the extensions of the magnetic steel slots in the magnetic steel slot groups.

[0010] In addition, the rotor assembly according to this application may also have the following additional technical features:

[0011] In some embodiments, the extension is disposed on one side of the magnet groove, and the extension is a groove;

[0012] The grooves in the multiple rotor lamination groups are located in different positions.

[0013] In some embodiments, the grooves in the rotor laminations are arranged radially offset from each other in the rotor laminations, and after multiple rotor laminations are assembled, the grooves of each rotor lamination are connected to form the second oil cooling channel.

[0014] In some embodiments, each of the magnet slot groups includes two pairs of magnet slots, wherein one of the pairs of magnet slots is provided with the groove; and / or, each of the magnet slot groups is double V-shaped.

[0015] In some of these embodiments, the number of the first oil cooling channels is A1, and the number of poles of the rotor in the rotor assembly is P, where A1 ≥ P; and / or, the number of the second oil cooling channels is B1, and the number of poles of the rotor in the rotor assembly is P, where B1 ≥ P.

[0016] In some embodiments, the first oil cooling channel is located between two adjacent magnetic steel slots and close to the rotating shaft; the cross-section of the first oil cooling channel is elliptical, teardrop-shaped, triangular, or a polygon with more than three sides.

[0017] In some embodiments, the second oil cooling channel is located on one side of a pair of magnet slots facing each other; the flow path of the fluid in the second oil cooling channel is stepped, zigzag, V-shaped, or W-shaped.

[0018] In some embodiments, the rotor core has a first end and a second end in the axial direction, the first oil cooling channel extends through the first end and the second end, and forms a first oil inlet at the first end and a first oil outlet at the second end; the second oil cooling channel extends through the second end and the first end, and forms a second oil inlet at the second end and a second oil outlet at the first end; and / or, each rotor lamination group is composed of multiple identical laminations stacked together, and each rotor lamination group is provided with a first oil hole extending through the axial direction, and the first oil holes in the multiple rotor lamination groups are sequentially connected to form the first oil cooling channel.

[0019] In some embodiments, the rotor assembly further includes a first end plate and a second end plate with the same structure; the first end plate is provided with a first oil inlet groove and a second oil outlet groove, and the second end plate is provided with a first oil outlet groove and a second oil inlet groove, the first oil inlet groove being connected to the shaft oil outlet hole and the first oil inlet of the rotating shaft respectively, and the second oil inlet groove being connected to the shaft oil outlet hole and the second oil inlet of the rotating shaft respectively.

[0020] In some embodiments, the oil outlet of the shaft includes a first oil outlet near the first end plate and a second oil outlet near the second end plate, the first oil inlet groove is connected to the first oil outlet, and the second oil inlet groove is connected to the second oil outlet; and / or, the first end plate is further provided with a first end plate oil outlet, the second oil outlet groove is connected to the second oil outlet and the first end plate oil outlet respectively; the second end plate is further provided with a second end plate oil outlet, and the first oil outlet groove is connected to the first oil outlet and the second end plate oil outlet respectively.

[0021] In some embodiments, the rotor assembly further includes a first end plate and a second end plate, the structures of which may be different; the first end plate is provided with a first oil inlet groove and a second oil outlet groove, the second end plate is provided with a first oil outlet hole and a second oil inlet groove, the first oil inlet groove is connected to the shaft oil outlet hole and the first oil inlet of the rotating shaft respectively, and the second oil inlet groove is connected to the shaft oil outlet hole and the second oil inlet of the rotating shaft respectively.

[0022] In some embodiments, the oil outlet of the shaft includes a first oil outlet near the first end plate and a second oil outlet near the second end plate, the first oil inlet groove is connected to the first oil outlet, and the second oil inlet groove is connected to the second oil outlet; and / or, the first end plate is further provided with a first end plate oil outlet, the second oil outlet groove is connected to the second oil outlet and the first end plate oil outlet respectively; the first oil outlet and the first oil outlet are connected.

[0023] In some embodiments, the number of the first shaft oil outlet and the number of the second shaft oil outlet are both multiple, and the multiple first shaft oil outlets and the multiple second shaft oil outlets are evenly arranged along the circumference of the shaft; the first shaft oil outlets and the second shaft oil outlets are staggered in the axial direction, or the first shaft oil outlets and the second shaft oil outlets are arranged at a difference of 5°-60° after being projected onto the same plane.

[0024] In some embodiments, the first end plate oil outlet is located near the outer peripheral edge of the first end plate, and the angle between the first end plate oil outlet and the end face of the first end plate is C1, satisfying 0°≤C1≤80°; the second end plate oil outlet or the first oil outlet is located near the outer peripheral edge of the second end plate, and the angle between the second end plate oil outlet or the first oil outlet and the end face of the second end plate is C2, satisfying 0°≤C2≤80°.

[0025] According to another aspect of this application, an electric motor is provided, including a rotor assembly, said rotor assembly being the aforementioned rotor assembly.

[0026] By adopting the above technical solution, this application has at least the following beneficial effects compared with the prior art:

[0027] The rotor core in the provided rotor assembly is equipped with a first rotor oil passage and a second rotor oil passage, which are connected in parallel. This multi-channel parallel cooling method can better cool the rotor core and the magnets (magnets) disposed on it. The first rotor oil passage includes multiple first oil cooling channels located between adjacent magnet slot groups, which can cool the rotor core and improve its cooling effect. Different rotor lamination groups in the rotor core have different magnet slot structures, and the second rotor oil passage includes multiple second oil cooling channels formed by connecting the extensions of the magnet slots in the magnet slot groups. These channels not only cool the magnets and reduce their temperature rise, but also have a specific, such as non-linear, oil path, which helps increase the contact area between the oil and the magnets, improving the cooling effect. In this way, oil can enter multiple oil cooling channels in the rotor core, increasing the heat dissipation area, achieving uniform heat dissipation, and improving heat dissipation efficiency. Therefore, the oil circuit cooling structure of the rotor core helps to increase the heat exchange efficiency between the oil and the rotor core and magnets (magnets), reduce the temperature of the rotor assembly, and improve the reliability and cost-effectiveness of the motor during operation.

[0028] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the rotor assembly disclosed in an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the structure of a rotor core disclosed in an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of another rotor core and first end plate structure disclosed in an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of another rotor core and second end plate structure disclosed in an embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the structure of the first end plate and the second end plate in some embodiments of this application; Figure 5 (a) is a schematic diagram of the first end plate. Figure 5 (b) is a schematic diagram of the second end plate;

[0034] Figure 6 This is a schematic diagram of the oil flow in the first and second oil cooling channels according to some embodiments of this application; Figure 6 (a) is a schematic diagram of the first oil cooling channel. Figure 6 (b) is a schematic diagram of the second oil cooling channel;

[0035] Figure 7 This is a schematic diagram of the structure of the first end plate and the second end plate in some other embodiments of this application; Figure 7 (a) is a schematic diagram of the first end plate. Figure 7 (b) is a schematic diagram of the second end plate;

[0036] Figure 8 This is a schematic diagram of the oil flow in the first and second oil cooling channels according to other embodiments of this application; Figure 8 (a) is a schematic diagram of the first oil cooling channel. Figure 8 (b) is a schematic diagram of the second oil cooling channel;

[0037] Figure 9 This is a schematic diagram of the structure of the rotating shaft disclosed in the embodiments of this application;

[0038] Figure 10 This is a schematic diagram of the structure of the first stack of wafers disclosed in an embodiment of this application;

[0039] Figure 11 This is a schematic diagram of the structure of the second stack of wafers disclosed in an embodiment of this application;

[0040] Figure 12 This is a schematic diagram of the structure of the third lamination disclosed in the embodiments of this application;

[0041] Figure 13This is a schematic diagram of the structure of the fourth lamination disclosed in the embodiments of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100 - Rotor core;

[0044] 101 - First rotor oil passage; 110 - First oil cooling passage; 111 - First oil inlet; 112 - First oil outlet;

[0045] 102 - Second rotor oil passage; 120 - Second oil cooling passage; 121 - Second oil inlet; 122 - Second oil outlet;

[0046] 130 - Rotor lamination group; 131 - First rotor lamination group; 132 - Second rotor lamination group; 133 - Third rotor lamination group; 134 - Fourth rotor lamination group; 1311 - First lamination; 1321 - Second lamination; 1331 - Third lamination; 1341 - Fourth lamination;

[0047] 140 - Magnet slot assembly; 141 - Magnet slot; 1411 - First magnet slot; 1412 - Groove;

[0048] 200 - Shaft; 210 - First shaft oil outlet; 220 - Second shaft oil outlet;

[0049] 300 - First end plate; 310 - First oil inlet groove; 320 - Second oil outlet groove; 330 - Oil outlet hole of the first end plate;

[0050] 400 - Second end plate; 410 - First oil outlet groove; 420 - Second oil inlet groove; 430 - Oil outlet hole of second end plate; 440 - First oil outlet hole. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0053] The embodiments of this application will be described in detail below with reference to the accompanying drawings, through specific examples and application scenarios. A description of the specific technical solutions is provided below.

[0054] Please see Figures 1 to 13 As shown, this embodiment provides a rotor assembly, which includes a rotor, a first end plate 300, and a second end plate 400. The rotor includes a rotor core 100 and a rotating shaft 200. The rotor also includes a permanent magnet, such as a magnet (not labeled), disposed in the rotor core 100. That is, the rotor includes a rotor core 100, a rotating shaft 200, and a magnet. The rotor core 100 can be sleeved on the outside of the rotating shaft 200; for example, the rotating shaft 200 mates with and penetrates the rotor core 100. For example, the rotor core 100 has a central hole, and the rotating shaft 200 passes through the central hole of the rotor core 100 and penetrates the rotor core 100.

[0055] The rotor core 100 has a rotor oil passage, and the rotating shaft 200 may be provided with a rotating shaft oil outlet, which is connected to the rotor oil passage. Cooling oil can enter the rotor oil passage through the rotating shaft oil outlet. The cooling oil in this rotor oil passage can be divided into two paths: a first rotor oil passage 101 and a second rotor oil passage 102. The cooling oil in the first rotor oil passage 101 can be used to dissipate heat from the rotor core 100, and the cooling oil in the second rotor oil passage 102 can be used to dissipate heat from the magnets. The first rotor oil passage 101 and the second rotor oil passage 102 are arranged in parallel. That is, by adopting a multi-stage cooling method with multiple cooling oil passages in parallel, it is convenient to arrange multiple layers of oil passages and can effectively cool the multi-stage permanent magnets and the rotor core 100.

[0056] The first rotor oil passage 101 consists of multiple first oil cooling channels 110, and the second rotor oil passage 102 consists of multiple second oil cooling channels 120. Optionally, along the circumference of the rotor core 100, the multiple first oil cooling channels 110 are evenly distributed at intervals and are arranged in parallel, i.e., connected in parallel; similarly, the multiple second oil cooling channels 120 are evenly distributed at intervals and are arranged in parallel, i.e., connected in parallel. Thus, by arranging multiple first oil cooling channels 110 and multiple second oil cooling channels 120, the heat dissipation area can be increased, further improving the uniformity of heat dissipation. Furthermore, the arrangement of the multiple parallel first oil cooling channels 110, the multiple parallel second oil cooling channels 120, and the parallel first rotor oil passage 101 and second rotor oil passage 102 not only helps to increase the uniformity and effectiveness of heat dissipation but also helps to reduce the performance requirements of the oil pump and lower costs.

[0057] The rotor core 100 includes multiple rotor lamination groups 130 stacked axially. That is, multiple rotor lamination groups 130 stacked axially can be assembled into the rotor core 100, and multiple rotor lamination groups 130 assembled together can form the aforementioned rotor core 100 having a first rotor oil passage 101 and a second rotor oil passage 102. Each rotor lamination group 130 can be formed by stacking multiple rotor laminations. Each rotor lamination group 130 is provided with multiple magnet slot groups 140, which can be arranged at intervals along the circumference of the rotor core 100. Each magnet slot group 140 can be composed of several magnet slots 141. When there are two or more magnet slot groups 140, the structure of the magnet slots 141 in at least two rotor lamination groups 130 is different. That is, the multiple magnet slot groups 140 in two or more rotor lamination groups 130 have different magnet slot 141 structures. The first oil cooling channel 110 is located between two adjacent magnet slot groups 140 and can be used to cool and dissipate heat from the rotor core 100. The magnet slots have extensions, and the second oil cooling channel 120 is formed by connecting the extensions of the magnet slots 141 in the magnet slot group 140 and can be used to cool and dissipate heat from the magnets in the magnet slots 141.

[0058] It should be noted that in this embodiment, the rotor assembly is equipped with multiple layers of permanent magnets, i.e., multiple layers of magnets. The number of magnet layers is greater than or equal to one. For example, each rotor lamination group 130 has one layer of magnets, and multiple rotor lamination groups 130 include multiple layers of magnets. The rotor core 100 has more than or equal to two rotor oil passages, at least one of which is located between two adjacent magnet slot groups 140, i.e., between the poles of the magnets, such as the first rotor oil passage 101; and at least one rotor oil passage is connected to the magnet slot 141, such as the second rotor oil passage 102. Therefore, the rotor oil passages of the rotor core 100 include, but are not limited to, the first rotor oil passage 101 and the second rotor oil passage 102, but can also be provided in the third rotor oil passage, fourth rotor oil passage, etc., according to actual needs. Different rotor oil passages can be composed of multiple evenly distributed oil cooling channels, and different rotor oil passages can be connected in parallel. In this way, the multi-layered magnets and rotor core can be cooled better by connecting multiple rotor oil passages in parallel.

[0059] Therefore, based on the above configuration, the rotor assembly of this application, through the rotor lamination group and rotor oil circuit of the above-described structural form, can increase the heat dissipation area, improve the uniformity of heat dissipation, and have a better heat dissipation effect on both the rotor core and the magnets, thereby improving the heat dissipation efficiency. Specifically, the first rotor oil circuit 101 and the second rotor oil circuit 102 in the provided rotor assembly are arranged in parallel. The multi-channel parallel oil circuit cooling method can better cool the rotor core and the magnets located on the rotor core. The first rotor oil circuit 101 includes a plurality of first oil cooling channels 110 located between two adjacent magnet slot groups 140, that is, the first oil cooling channels 110 are located between the poles of the magnets, which can cool the rotor core 100 and help improve the cooling effect of the rotor core 100. Different rotor laminations 130 in the rotor core 100 have different magnet slot 141 structures. For example, the arrangement of the extension portion of the magnet slot 141 can be slightly different. The second rotor oil passage 102 includes multiple second oil cooling channels 120 formed by connecting the extension portions of the magnet slots 141 in the magnet slot group 140. These channels not only cool the magnets in the magnet slots 141, reducing the temperature rise of the rotor magnets, but also, due to the different arrangements of the magnet slots 141, allow the second oil cooling channels 120 to have a non-linear oil path, which helps to increase the contact area between the oil and the magnets, improving the cooling effect of the magnets. In this way, oil can enter multiple oil cooling channels in the rotor core 100, increasing the heat dissipation area, achieving uniform heat dissipation, and improving heat dissipation efficiency. Therefore, the oil passage heat dissipation structure of the rotor core 100 helps to increase the heat exchange efficiency between the oil and the rotor core 100 and the magnets, reduce the temperature of the rotor assembly, and improve the reliability and cost-effectiveness of the motor during operation.

[0060] like Figures 1 to 8As shown, in some embodiments, the rotor core 100 has a first end and a second end in the axial direction. A first oil cooling channel 110 extends through the first end and the second end, and the first oil cooling channel 110 forms a first oil inlet 111 at the first end, into which oil is supplied. A first oil outlet 112 is formed at the second end, through which oil flows out of the first oil cooling channel 110. A second oil cooling channel 120 extends through the second end and the first end, and the second oil cooling channel 120 forms a second oil inlet 121 at the second end, into which oil is supplied. A second oil outlet 122 is formed at the first end, through which oil flows out of the second oil cooling channel 120. The first end can be the left end or the front end, and the second end can be the right end or the rear end.

[0061] This configuration allows oil to be supplied to the rotor core 100 from both axial ends. For example, the cooling oil in the first oil-cooling channel 110 enters from the first end of the rotor core 100 and flows out from the second end, exchanging heat with the rotor core 100 to dissipate heat. Similarly, the cooling oil in the second oil-cooling channel 120 enters from the second end of the rotor core 100 and flows out from the first end, exchanging heat with the magnets to dissipate heat. By supplying oil from both ends of the rotor core 100, more uniform heat dissipation can be achieved compared to single-sided oil supply, improving heat dissipation efficiency and enhancing the cooling effect.

[0062] The number of the aforementioned first oil cooling channels 110 is multiple, and correspondingly, the multiple first oil cooling channels 110 form multiple first oil inlets 111 and multiple first oil outlets 112, with the multiple first oil inlets 111 and the multiple first oil outlets 112 connected in a one-to-one correspondence; the number of the aforementioned second oil cooling channels 120 is multiple, and correspondingly, the multiple second oil cooling channels 120 form multiple second oil inlets 121 and multiple second oil outlets 122, with the multiple second oil inlets 121 and the multiple second oil outlets 122 connected in a one-to-one correspondence.

[0063] It should be noted that in the plurality of first oil cooling channels 110, the plurality of first oil inlets 111 can all be located at the first end of the rotor core 100, and the plurality of first oil outlets 112 can all be located at the second end of the rotor core 100; in the plurality of second oil cooling channels 120, the plurality of second oil inlets 121 can all be located at the second end of the rotor core 100, and the plurality of second oil outlets 122 can all be located at the first end of the rotor core 100. This arrangement facilitates the layout and helps to enhance heat dissipation efficiency and effect.

[0064] Furthermore, in other embodiments, the oil inlets and outlets may have different distribution patterns. For example, a portion of the multiple first oil inlets 111 may be located at the first end of the rotor core 100, while the remaining portion may be located at the second end. Similarly, a portion of the multiple first oil outlets 112 may be located at the second end of the rotor core 100, while the remaining portion may be located at the first end. Likewise, a portion of the multiple second oil inlets 121 may be located at the second end of the rotor core 100, while the remaining portion may be located at the first end. Similarly, a portion of the multiple second oil outlets 122 may be located at the first end of the rotor core 100, while the remaining portion may be located at the second end. Exemplarily, the number of first oil cooling channels 110 is six, with three first oil inlets 111 located at the first end, three first oil inlets 111 located at the second end, three first oil outlets 112 located at the second end, and three first oil outlets located at the first end.

[0065] In some embodiments, the rotor core 100 includes at least two different rotor lamination groups 130. Each rotor lamination group 130 is composed of multiple identical laminations stacked together. That is, each rotor lamination group 130 can be composed of multiple laminations stacked along the thickness direction, and the laminations in the same rotor lamination group 130 can be set to be identical. The number of rotor lamination groups 130 and the number of laminations in each rotor lamination group 130 are not limited and can be selected according to actual needs. The rotor core 100 is composed of at least two types of laminations, such as at least two types of laminations with different magnetic slots 141.

[0066] Each rotor lamination group 130 is provided with a first oil hole that extends through the axial direction. The first oil holes in the multiple rotor lamination groups 130 are connected in sequence to form a first oil cooling channel 110. The first oil cooling channel 110 forms a first oil inlet 111 at the first end of the rotor core 100 and a first oil outlet 112 at the second end. The extensions of the magnet slots 141 in the magnet slot groups 140 of the multiple rotor lamination groups 130 are connected to form a second oil cooling channel 120. The second oil cooling channel 120 forms a second oil inlet 121 at the second end of the rotor core 100 and a second oil outlet 122 at the first end.

[0067] For example, in this embodiment, the rotor core 100 is composed of four types of laminations, which are formed by different arrangements of the magnet slots 141, such as... Figures 10 to 13 As shown, the four types of stacked sheets are the first stacked sheet 1311, the second stacked sheet 1321, the third stacked sheet 1331, and the fourth stacked sheet 1341.

[0068] like Figure 2As shown, in some embodiments, the rotor core 100 includes four sets of rotor laminations 130, namely, a first rotor lamination set 131, a second rotor lamination set 132, a third rotor lamination set 133, and a fourth rotor lamination set 134, which are stacked sequentially along the axial direction. The laminations in the first rotor lamination set 131, the second rotor lamination set 132, the third rotor lamination set 133, and the fourth rotor lamination set 134 are all different. Thus, the rotor core 100 is composed of four types of laminations, with each type of lamination forming one rotor lamination set. Furthermore, the four types of laminations are stacked together to form four sets of rotor laminations 130 of equal length. These four sets of rotor laminations 130 are alternately combined to form the complete rotor core 100.

[0069] like Figure 1 or Figure 3 or Figure 4 As shown, in other embodiments, the rotor core 100 includes eight sets of rotor laminations 130, namely, the first rotor lamination set 131, the second rotor lamination set 132, the third rotor lamination set 133, and the fourth rotor lamination set 134. These four sets of laminations are stacked sequentially along the axial direction, and the laminations in each set are different. Thus, the rotor core 100 is composed of four types of laminations, with each type forming one set of rotor laminations 130. Furthermore, the four types of laminations are stacked together to form eight sets of rotor laminations 130 of equal length. These eight sets of rotor laminations 130 are alternately combined to form the complete rotor core 100.

[0070] It should be understood that in other embodiments, the type of laminations and the number of rotor lamination groups 130 may be other quantities, and there is no limitation thereto.

[0071] In this embodiment, to increase the contact area between the cooling oil and the multilayer magnets in the second cooling channel, this can be achieved by changing the structural configuration of the magnet slots 141 on the laminations. For example, the magnet slots 141 may have an extension portion, and the position of the extension portion of the magnet slots on different laminations may vary slightly. For example, in some embodiments, each magnet slot group 140 includes at least one pair of magnet slots, with the extension portion located on one side of the magnet slot 141. This extension portion can be a groove. Further, each pair of magnet slots includes two magnet slots 141 arranged at an angle, with an extension portion, i.e., a groove 1412, provided on the opposite side of the two magnet slots 141. The grooves 1412 of the magnet slots 141 in the multiple rotor lamination groups 130 are positioned differently. After the multiple rotor lamination groups 130 are assembled, the grooves 1412 of each rotor lamination group 130 are connected to form the second oil cooling channel 120.

[0072] In this embodiment, each magnet slot group 140 includes two pairs of magnet slots, wherein the magnet slot 141 in one pair of magnet slots is provided with a groove 1412; each magnet slot group 140 is double V-shaped, that is, both pairs of magnet slots are V-shaped grooves. The design of the magnet slots 141 of the above-mentioned lamination adopts a special structural design, such as adopting a generally double V-shaped magnetic circuit design, which helps to improve the overall performance of the motor. In this embodiment, six magnet slot groups 140 are provided in the same lamination, and each magnet slot group 140 is double V-shaped; the shape of each magnet slot group 140 can be the same, and the arrangement can also be the same, such as setting each magnet slot group 140 as double V-shaped or similar double V-shaped.

[0073] Each magnet slot group 140 includes two pairs of magnet slots, such as a pair of first magnet slots 1411 and a pair of second magnet slots. The pair of first magnet slots 1411 may include two relatively larger magnet slots located near the rotating shaft 200, and the pair of second magnet slots may include two relatively smaller magnet slots located near the edge of the lamination. Each of the two magnet slots 141 in the pair of first magnet slots 1411 may be provided with a groove 1412, with the two grooves 1412 facing each other; while the magnet slots 141 in the pair of second magnet slots may not be provided with grooves 1412. The arrangement of the grooves 1412 in the magnet slots 141 of different laminations may vary.

[0074] Optionally, the grooves 1412 of the magnet slots 141 in the plurality of rotor lamination assemblies 130 are arranged radially staggered in the rotor lamination assembly 130. For example, as shown... Figures 10 to 13 As shown, in this embodiment, the rotor core 100 is composed of four types of laminations, namely the first lamination 1311, the second lamination 1321, the third lamination 1331 and the fourth lamination 1341, forming four rotor lamination groups 130, namely the first rotor lamination group 131, the second rotor lamination group 132, the third rotor lamination group 133 and the fourth rotor lamination group 134. In this arrangement, the grooves 1412 of the pair of first magnetic slots 1411 of the first stack 1311 can be located in the upper part of the magnetic slots; the grooves 1412 of the pair of first magnetic slots 1411 of the second stack 1321 can be located in the upper-middle part of the magnetic slots; the grooves 1412 of the pair of first magnetic slots 1411 of the third stack 1331 can be located in the middle or lower-middle part of the magnetic slots; and the grooves 1412 of the pair of first magnetic slots 1411 of the fourth stack 1341 can be located in the lower part of the magnetic slots. This arrangement creates a staggered arrangement of the grooves 1412 of the magnetic slots 141. The grooves 1412 of the magnetic slots 141 of different stacks can have partially staggered or partially overlapping portions.

[0075] Therefore, by setting different stacked plates, especially different magnet slots 141 in different stacked plates, the contact area between the cooling oil and the magnet is increased, the magnet temperature is prevented from getting too high, and the cooling effect on the magnet is improved.

[0076] It should be understood that the rotor also includes multiple magnets, and each rotor lamination 130 is equipped with a magnet; magnet slots 141 are available for magnet installation, and multiple magnets can be arranged one by one in each magnet slot 141. Optionally, the magnets can be fixed in the magnet slots 141 by magnet adhesive.

[0077] Optionally, multiple first oil cooling channels 110 are evenly spaced along the circumference of the rotor core 100, and the shape and size of the multiple first oil cooling channels 110 can be the same.

[0078] In some embodiments, the number of first oil cooling channels 110 is A1, and the number of poles of the rotor in the rotor assembly is P, where A1 ≥ P. The number of poles refers to the number of pairs of magnetic poles. For example, in this embodiment, the number of poles P of the rotor is 6, the number of pairs of magnetic poles (pole number) is 6, and the number of first oil cooling channels 110 is ≥ 6. In this embodiment, there are 6 first oil cooling channels 110, that is, 6 first oil cooling channels 110 are evenly distributed circumferentially around the rotor core 100, consistent with the number of magnet poles 6, and the 6 first oil cooling channels 110 form the first rotor oil passage 101. Furthermore, in other embodiments, the number of first oil cooling channels 110 can be more than 6, or multiple first oil cooling channels 110 not less than the number of rotor poles can be provided.

[0079] In some embodiments, the first oil cooling channel 110 is located between two adjacent magnet slot groups 140 and close to the rotating shaft 200. The cross-section of the first oil cooling channel 110 can be elliptical, teardrop-shaped, triangular, or a polygon with more than three sides, but is not limited to these. For example, the cross-section of the first oil cooling channel 110 can also be a circular, flower-shaped, or other regular or irregular shape. The aforementioned polygon with more than three sides can be, for example, a quadrilateral, pentagon, or hexagon. The cross-sectional shape of the first oil cooling channel 110 is preferably non-circular, such as teardrop-shaped or triangular.

[0080] According to this embodiment, the rotor core 100 is formed by at least two types of rotor laminations 130, and multiple first oil cooling channels 110 are formed between the magnet poles and close to the rotating shaft 200. The number A1 of the multiple first oil cooling channels 110 is greater than or equal to the number of rotor poles P. Furthermore, the cross-sectional shape of the first oil cooling channels 110 can be a circular, teardrop, triangular, or other shapes. Thus, by setting the above-mentioned multiple first oil cooling channels 110 and making the cross-sectional shape of the first oil cooling channels 110 teardrop, triangular, circular, or other shapes, the contact area between the cooling oil and the rotor core 100 is increased, thereby improving the cooling effect on the rotor core 100.

[0081] It is understood that the shapes of the first oil inlets 111 and the first oil outlets 112 at both ends of the first oil cooling channel 110 can be elliptical, near-circular, teardrop-shaped, triangular, or polygonal with more than three sides. In this embodiment, in the plurality of first oil cooling channels 110, the plurality of first oil inlets 111 and the plurality of first oil outlets 112 are all set to teardrop shape, and the opening areas of the first oil inlets 111 and the first oil outlets 112 are equal. Of course, in other embodiments, the shape or size of the plurality of first oil inlets 111 may also be slightly different, the shape or size of the plurality of first oil outlets 112 may also be slightly different; or the shape or size of the first oil inlets 111 and the first oil outlets 112 may also be slightly different.

[0082] Optionally, multiple second oil cooling channels 120 are evenly spaced along the circumference of the rotor core 100, and the shape and size of the multiple second oil cooling channels 120 can be the same.

[0083] In some embodiments, the number of second oil cooling channels 120 is B1, and the number of poles of the rotor in the rotor assembly is P, where B1 ≥ P. The number of poles refers to the number of pairs of magnetic poles. For example, in this embodiment, the number of poles P of the rotor is 6, the number of pairs of magnetic poles (pole number) is 6, and the number of second oil cooling channels 120 is ≥ 6. In this embodiment, the number of second oil cooling channels 120 is 12, that is, 12 second oil cooling channels 120 are evenly distributed circumferentially around the rotor core 100, which, together with twice the number of magnetic poles, form the second rotor oil passage 102. Furthermore, in other embodiments, the number of second oil cooling channels 120 can also be 6 or more, or a plurality of second oil cooling channels 120 not less than the number of rotor poles can be provided.

[0084] In some embodiments, the second oil cooling channel 120 is disposed on one side opposite to a pair of magnet slots, such as a pair of first magnet slots 1411; the flow path of the fluid in the second oil cooling channel 120 is stepped, zigzag, V-shaped, or W-shaped, but not limited to these, for example, it can also be a shape similar to a "diagonal I" shape. The shape of the second oil cooling channel 120 is preferably non-linear or non-straight-through (non-straight-line), for example, it can be a shape similar to a "diagonal I", stepped, zigzag, V-shaped, etc.

[0085] According to this embodiment, the rotor core 100 is formed by at least two types of rotor laminations 130, and multiple second oil cooling channels 120 are formed near and connected to the magnet slots 141. The number B1 of the multiple second oil cooling channels 120 is greater than or equal to the number of poles P of the rotor. Furthermore, the flow path of the fluid in the second oil cooling channels 120 is a shape similar to a "diagonal I" shape, a stepped shape, a broken line shape, a V shape, or a W shape. Thus, by setting up the above-mentioned multiple second oil cooling channels 120 and making the flow path of the fluid in the second oil cooling channels 120 a shape similar to a "diagonal I" shape, a stepped shape, a broken line shape, or a V shape, the contact area between the cooling oil and the magnet is increased, and the cooling effect on the magnet is improved.

[0086] In the aforementioned plurality of second oil cooling channels 120, the shape or size of the plurality of second oil inlets 121 may be the same or slightly different, and the shape or size of the plurality of second oil outlets 122 may be the same or slightly different; or the shape or size of the second oil inlets 121 and the second oil outlets 122 may be the same or slightly different.

[0087] In some specific embodiments, two different shapes of the second oil cooling channel 120 are listed below. In some cases, the second oil cooling channel 120 is V-shaped, and in other cases, the second oil cooling channel 120 is in a "slanted I" shape.

[0088] In the first specific implementation, such as Figure 5 and Figure 6 As shown, a first end plate 300 is provided at the first end of the rotor core 100, that is, the first end plate 300 is located at the first end of the rotor core 100 and cooperates with the rotating shaft 200; a second end plate 400 is provided at the second end of the rotor core 100, that is, the second end plate 400 is located at the second end of the rotor core 100 and cooperates with the rotating shaft 200. The first end plate 300 and the second end plate 400 have the same structure. The rotating shaft 200 has a hollow structure, that is, the rotating shaft 200 is a hollow shaft, and the end face is provided with a rotating shaft oil inlet, such as a rotating shaft oil inlet on the left end face or the right end face of the rotating shaft 200. Several rotating shaft oil outlet holes are provided on the circumferential surface of the rotating shaft 200. The rotating shaft oil outlet holes can communicate with the rotor oil passage of the rotor core 100; the cooling oil can enter the interior of the rotating shaft 200 through the rotating shaft oil inlet and enter the rotor oil passage of the rotor core 100 through the rotating shaft oil outlet holes.

[0089] The first end plate 300 is provided with a first oil inlet groove 310 and a second oil outlet groove 320, and the second end plate 400 is provided with a first oil outlet groove 410 and a second oil inlet groove 420. The first oil inlet groove 310 is connected to the oil outlet hole of the rotating shaft and the first oil inlet 111, respectively, and the second oil inlet groove 420 is connected to the oil outlet hole of the rotating shaft and the second oil inlet 121, respectively. The first oil inlet groove 310 of the first end plate 300 enables the connection between the oil outlet hole of the rotating shaft and the first oil inlet 111 of the first oil cooling channel 110, that is, the connection between the oil outlet hole of the rotating shaft and the first rotor oil passage 101 is realized; the second oil inlet groove 420 of the second end plate 400 enables the connection between the oil outlet hole of the rotating shaft and the second oil cooling channel 120, that is, the connection between the oil outlet hole of the rotating shaft and the second rotor oil passage 102 is realized.

[0090] The aforementioned oil outlet holes of the rotating shaft include a first oil outlet hole 210 and a second oil outlet hole 220. The first oil outlet hole 210 is located near the first end plate 300, i.e., the first end of the rotor core 100, and the second oil outlet hole 220 is located near the second end plate 400, i.e., the second end of the rotor core 100. The first oil inlet groove 310 is connected to the first oil outlet hole 210 and the first oil inlet 111, thereby enabling oil supply to the first oil cooling channel 110; the second oil inlet groove 420 is connected to the second oil outlet hole 220 and the second oil inlet 121, thereby enabling oil supply to the second oil cooling channel 120. Furthermore, the first end plate 300 is also provided with a first end plate oil outlet 330, and the second oil outlet groove 320 is connected to the second oil outlet 122 and the first end plate oil outlet 330 respectively, so that the oil can flow out from the second oil cooling channel 120 and then out through the second oil outlet groove 320 and the first end plate oil outlet 330; the second end plate 400 is also provided with a second end plate oil outlet 430, and the first oil outlet groove 410 is connected to the first oil outlet 112 and the second end plate oil outlet 430 respectively, so that the oil can flow out from the first oil cooling channel 110 and then out through the first oil outlet groove 410 and the second end plate oil outlet 430.

[0091] Therefore, regarding the flow of oil in the first oil cooling channel 110, such as... Figure 6 As shown in (a), the cooling oil of the cooling system enters the interior of the rotating shaft 200 through the rotating shaft inlet, and then enters the first oil cooling channel 110 through the first rotating shaft outlet 210, the first oil inlet groove 310 of the first end plate 300, and the first oil inlet 111, thus supplying oil to the first oil cooling channel 110. The cooling oil then flows out through the first oil outlet 112, the first oil outlet groove 410 of the second end plate 400, and the second end plate outlet 430 of the second end plate 400, thus exiting the first oil cooling channel 110. The oil flow direction in the first oil cooling channel 110 is from the first end plate 300 to the second end plate 400, for example, from left to right. The cross-section of the first oil cooling channel 110 can be teardrop-shaped.

[0092] Regarding the flow of oil in the second oil cooling channel 120, as follows: Figure 6 As shown in (b), the cooling oil of the cooling system enters the interior of the rotating shaft 200 through the rotating shaft inlet, and then enters the second oil cooling channel 120 through the second rotating shaft outlet 220, the second oil inlet groove 420 and the second oil inlet 121 of the second end plate 400, thus supplying oil to the second oil cooling channel 120. The cooling oil then flows out through the second oil outlet 122, the second oil outlet groove 320 of the first end plate 300 and the first end plate outlet hole 330 of the first end plate 300, thus exiting the second oil cooling channel 120. The oil flow direction in the second oil cooling channel 120 is from the second end plate 400 to the first end plate 300, for example, from right to left. In this embodiment, the oil flow direction in the first oil cooling channel 110 is opposite to the oil flow direction in the second oil cooling channel 120. The second oil cooling channel 120 is V-shaped.

[0093] In the second specific implementation, such as Figure 7 and Figure 8 As shown, a first end plate 300 is provided at the first end of the rotor core 100, that is, the first end plate 300 is provided at the first end of the rotor core 100 and cooperates with the rotating shaft 200; a second end plate 400 is provided at the second end of the rotor core 100, that is, the second end plate 400 is provided at the second end of the rotor core 100 and cooperates with the rotating shaft 200. In this embodiment, the structures of the first end plate 300 and the second end plate 400 are completely different. The second end plate 400 adopts a simpler structure than the first end plate 300. The rotating shaft 200 is a hollow structure, that is, the rotating shaft 200 is a hollow shaft, and the end face is provided with a rotating shaft oil inlet. For example, the rotating shaft oil inlet is provided on the left or right end face of the rotating shaft 200. Several rotating shaft oil outlet holes are provided on the circumferential surface of the rotating shaft 200. The rotating shaft oil outlet holes can be connected to the rotor oil circuit of the rotor core 100. The cooling oil can enter the interior of the rotating shaft 200 through the rotating shaft oil inlet and enter the rotor oil circuit of the rotor core 100 through the rotating shaft oil outlet holes.

[0094] The first end plate 300 is provided with a first oil inlet groove 310 and a second oil outlet groove 320, and the second end plate 400 is provided with a first oil outlet hole 440 and a second oil inlet groove 420. The first oil inlet groove 310 is connected to the shaft oil outlet hole and the first oil inlet 111, respectively, and the second oil inlet groove 420 is connected to the shaft oil outlet hole and the second oil inlet 121, respectively. The first oil inlet groove 310 of the first end plate 300 enables the connection between the shaft oil outlet hole and the first oil inlet 111 of the first oil cooling channel 110, that is, the connection between the shaft oil outlet hole and the first rotor oil passage 101 is realized; the second oil inlet groove 420 of the second end plate 400 enables the connection between the shaft oil outlet hole and the second oil cooling channel 120, that is, the connection between the shaft oil outlet hole and the second rotor oil passage 102 is realized.

[0095] The aforementioned oil outlet holes of the rotating shaft include a first oil outlet hole 210 and a second oil outlet hole 220. The first oil outlet hole 210 is located near the first end plate 300, i.e., the first end of the rotor core 100, and the second oil outlet hole 220 is located near the second end plate 400, i.e., the second end of the rotor core 100. The first oil inlet groove 310 is connected to the first oil outlet hole 210 and the first oil inlet 111, thereby enabling oil supply to the first oil cooling channel 110; the second oil inlet groove 420 is connected to the second oil outlet hole 220 and the second oil inlet 121, thereby enabling oil supply to the second oil cooling channel 120. Furthermore, the first end plate 300 is also provided with a first end plate oil outlet 330, and the second oil outlet groove 320 is connected to the second oil outlet 122 and the first end plate oil outlet 330 respectively. After the oil flows out from the second oil cooling channel 120, it flows out through the second oil outlet groove 320 and the first end plate oil outlet 330. The first oil outlet 440 of the second end plate 400 is directly connected to the first oil outlet 112. After the oil flows out from the first oil cooling channel 110, it flows out through the first oil outlet groove 410.

[0096] In this second embodiment, compared to the first embodiment, the structure of the second end plate 400 differs, and the shape of the second oil cooling channel 120 differs. However, the flow of the oil in the first oil cooling channel 110 can be the same as in the first embodiment, such as... Figure 8 As shown in (a), it will not be repeated here. Regarding the flow of oil in the second oil cooling channel 120, as follows... Figure 8 As shown in (b), the cooling oil of the cooling system enters the interior of the rotating shaft 200 through the rotating shaft inlet, and then enters the second oil cooling channel 120 through the second rotating shaft outlet 220, the second oil inlet groove 420, and the second oil inlet 121, thereby supplying oil to the second oil cooling channel 120. The cooling oil then flows out through the second oil outlet 122 and the first oil outlet 440, thus exiting the second oil cooling channel 120. The second oil cooling channel 120 is shaped like a slanted "I".

[0097] In some embodiments, there are multiple first shaft oil outlet holes 210 and multiple second shaft oil outlet holes 220, and the multiple first shaft oil outlet holes 210 and multiple second shaft oil outlet holes 220 are evenly arranged along the circumference of the shaft 200; the first shaft oil outlet holes 210 and the second shaft oil outlet holes 220 are staggered in the axial direction, or the first shaft oil outlet holes 210 and the second shaft oil outlet holes 220 are arranged with a difference of 5°-60° after being projected onto the same plane.

[0098] like Figure 9As shown, the plurality of first shaft oil outlet holes 210 are arranged near the first end plate 300, i.e., the first end of the rotor core 100, and are evenly arranged along the circumference of the shaft 200; the plurality of second shaft oil outlet holes 220 are arranged near the second end plate 400, i.e., the second end of the rotor core 100, and are evenly arranged along the circumference of the shaft 200. Optionally, in this embodiment, the number of first shaft oil outlet holes 210 is 6, and the number of second shaft oil outlet holes 220 is 6. Of course, in other embodiments, the number of first shaft oil outlet holes 210 and second shaft oil outlet holes 220 may be more than 6 or other numbers, and this is not limited.

[0099] The first oil outlet hole 210 and the second oil outlet hole 220 of the aforementioned shaft are offset in the axial direction of the shaft 200, that is, the first oil outlet hole 210 and the second oil outlet hole 220 are misaligned. In other words, the first oil outlet hole 210 and the second oil outlet hole 220 cannot be aligned with each other.

[0100] Optionally, the first shaft oil outlet 210 and the second shaft oil outlet 220 are arranged with a 5°-60° difference after being projected onto the same plane; further, the first shaft oil outlet 210 and the second shaft oil outlet 220 are arranged with a 20°-45° difference after being projected onto the same plane; exemplary, the first shaft oil outlet 210 and the second shaft oil outlet 220 can be arranged with a 30° difference after being projected onto the same plane. This facilitates the flow of cooling oil in the first oil cooling channel 110 and the second oil cooling channel 120, increases the heat dissipation area, and improves heat dissipation efficiency and uniformity.

[0101] like Figure 5 or Figure 7 As shown, in some embodiments, the first end plate oil outlet 330 is disposed near the outer peripheral edge of the first end plate 300, the first end plate oil outlet 330 is connected to the second oil outlet groove 320 of the first end plate 300, and the included angle between the first end plate oil outlet 330 and the end face of the first end plate 300 is C1, and satisfies 0°≤C1≤80°; the second end plate oil outlet 430 or the first oil outlet 440 is disposed near the outer peripheral edge of the second end plate 400, the second end plate oil outlet 430 is connected to the first oil outlet groove 410, and the included angle between the second end plate oil outlet 430 or the first oil outlet 440 and the end face of the second end plate 400 is C2, and satisfies 0°≤C2≤80°.

[0102] It should be noted that the opening section of the first end plate oil outlet 330 can be parallel to or inclined at a certain angle to the end face of the first end plate 300. For example, when the opening section of the first end plate oil outlet 330 is parallel to the end face of the first end plate 300, C1 is 0°; or the opening section of the first end plate oil outlet 330 is inclined to the end face of the first end plate 300, and the inclination angle C1 can be greater than 0° and less than or equal to 80°. The included angle C2 between the second end plate oil outlet 430 or the first oil outlet 440 and the end face of the second end plate 400 has the same or similar explanation as C1, and will not be repeated here.

[0103] Optionally, the included angle C1 between the oil outlet hole 330 of the first end plate and the end face of the first end plate 300 can be 0°, 30°, 60°, 80°, etc., preferably 0°. This facilitates the outflow of cooling oil in the second oil cooling channel 120, resulting in a simple structure and easy processing.

[0104] Optionally, the included angle C2 between the oil outlet hole 430 of the second end plate or the oil outlet hole 440 of the first end plate and the end face of the second end plate 400 is 0°, 30°, 60°, 80°, etc., preferably 0°. This facilitates the outflow of cooling oil in the first oil cooling channel 110, resulting in a simple structure and easy processing.

[0105] In summary, the rotor assembly of this application embodiment increases the heat exchange efficiency between the oil and the rotor core and magnets, greatly reduces the temperature of the rotor assembly, and improves the reliability and cost-effectiveness of the motor during operation.

[0106] In some embodiments, an electric motor is also provided, which includes the aforementioned rotor assembly. The electric motor obtained in this embodiment, by providing the aforementioned rotor assembly having a first rotor oil passage 101 and a second rotor oil passage 102, can improve the motor's heat dissipation efficiency and effect, thereby improving the reliability of the motor during operation.

[0107] It should be understood that the structure and connection settings of the rest of the motor can refer to existing technology, and are not limited thereto, and will not be described in detail here.

[0108] The parts not described in detail in this application specification are techniques known to those skilled in the art.

[0109] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0110] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A rotor assembly, characterized in that, include: A rotor core and a shaft, wherein the rotor core is sleeved on the outside of the shaft; The rotor core includes multiple rotor lamination groups stacked along the axial direction. Each rotor lamination group is provided with multiple magnetic slot groups arranged at intervals along the circumferential direction. The magnetic slots in the magnetic slot groups of at least two rotor lamination groups have different structures. The rotor core is provided with a first rotor oil passage and a second rotor oil passage arranged in parallel. The first rotor oil passage includes a plurality of first oil cooling channels, which are located between two adjacent magnetic steel slot groups. The second rotor oil passage includes a plurality of second oil cooling channels, which are formed by connecting the extensions of the magnetic steel slots in the magnetic steel slot groups. The extension is disposed on one side of the magnetic steel groove, and the extension is a groove; The grooves in the multiple rotor lamination groups are located in different positions; The grooves in the rotor lamination group are staggered in the radial direction of the rotor lamination group. After multiple rotor lamination groups are assembled, the grooves of each rotor lamination group are connected to form the second oil cooling channel.

2. The rotor assembly according to claim 1, characterized in that, Each of the said magnet slot groups includes two pairs of magnet slots, wherein one pair of magnet slots is provided with the groove; and / or, Each of the aforementioned magnet slots is double V-shaped.

3. The rotor assembly according to claim 1, characterized in that, The number of the first oil cooling channels is A1, and the number of poles of the rotor in the rotor assembly is P, where A1 ≥ P; and / or, The number of the second oil cooling channels is B1, and the number of poles of the rotor in the rotor assembly is P, where B1≥P.

4. The rotor assembly according to claim 1, characterized in that, The first oil cooling channel is located between two adjacent magnetic steel slot groups and close to the rotating shaft; The cross-section of the first oil cooling channel is elliptical, teardrop-shaped, triangular, or a polygon with more than three sides.

5. The rotor assembly according to claim 1, characterized in that, The second oil cooling channel is located on one side opposite to a pair of magnet slots; The flow path of the fluid in the second oil cooling channel is stepped, zigzag, V-shaped, or W-shaped.

6. The rotor assembly according to any one of claims 1 to 5, characterized in that, The rotor core has a first end and a second end in the axial direction. A first oil cooling channel extends through the first end and the second end, forming a first oil inlet at the first end and a first oil outlet at the second end. A second oil cooling channel extends through the second end and the first end, forming a second oil inlet at the second end and a second oil outlet at the first end. And / or... Each rotor lamination group is composed of multiple identical laminations stacked together, and each rotor lamination group is provided with a first oil hole that extends through in the axial direction. The first oil holes in the multiple rotor lamination groups are connected in sequence to form the first oil cooling channel.

7. The rotor assembly according to claim 6, characterized in that, The rotor assembly also includes a first end plate and a second end plate with the same structure. The first end plate is provided with a first oil inlet groove and a second oil outlet groove, and the second end plate is provided with a first oil outlet groove and a second oil inlet groove. The first oil inlet groove is connected to the shaft oil outlet hole and the first oil inlet of the rotating shaft, respectively, and the second oil inlet groove is connected to the shaft oil outlet hole and the second oil inlet of the rotating shaft, respectively.

8. The rotor assembly according to claim 7, characterized in that, The oil outlet of the shaft includes a first oil outlet near the first end plate and a second oil outlet near the second end plate. The first oil inlet groove communicates with the first oil outlet, and the second oil inlet groove communicates with the second oil outlet; and / or... The first end plate is also provided with a first end plate oil outlet hole, and the second oil outlet groove is connected to the second oil outlet and the first end plate oil outlet hole respectively; the second end plate is also provided with a second end plate oil outlet hole, and the first oil outlet groove is connected to the first oil outlet and the second end plate oil outlet hole respectively.

9. The rotor assembly according to claim 6, characterized in that, The rotor assembly also includes a first end plate and a second end plate; The first end plate is provided with a first oil inlet groove and a second oil outlet groove, and the second end plate is provided with a first oil outlet hole and a second oil inlet groove. The first oil inlet groove is connected to the shaft outlet hole and the first oil inlet of the rotating shaft, respectively, and the second oil inlet groove is connected to the shaft outlet hole and the second oil inlet of the rotating shaft, respectively.

10. The rotor assembly according to claim 9, characterized in that, The oil outlet of the shaft includes a first oil outlet near the first end plate and a second oil outlet near the second end plate. The first oil inlet groove communicates with the first oil outlet, and the second oil inlet groove communicates with the second oil outlet; and / or... The first end plate is also provided with a first end plate oil outlet hole, and the second oil outlet groove is connected to the second oil outlet and the first end plate oil outlet hole respectively; the first oil outlet and the first oil outlet hole are connected.

11. The rotor assembly according to claim 8 or 10, characterized in that, The number of the first shaft oil outlet hole and the number of the second shaft oil outlet hole are both multiple, and the multiple first shaft oil outlet holes and the multiple second shaft oil outlet holes are evenly arranged along the circumference of the shaft. The first and second oil outlet holes of the rotating shaft are staggered in the axial direction, or the first and second oil outlet holes of the rotating shaft are arranged at a difference of 5°-60° after being projected onto the same plane.

12. The rotor assembly according to claim 8, characterized in that, The oil outlet hole of the first end plate is located near the outer peripheral edge of the first end plate, and the angle between the oil outlet hole of the first end plate and the end face of the first end plate is C1, which satisfies 0°≤C1≤80°. The oil outlet hole of the second end plate is located near the outer peripheral edge of the second end plate, and the included angle between the oil outlet hole of the second end plate and the end face of the second end plate is C2, which satisfies 0°≤C2≤80°.

13. The rotor assembly according to claim 10, characterized in that, The oil outlet hole of the first end plate is located near the outer peripheral edge of the first end plate, and the angle between the oil outlet hole of the first end plate and the end face of the first end plate is C1, which satisfies 0°≤C1≤80°. The first oil outlet is located near the outer peripheral edge of the second end plate, and the angle between the first oil outlet and the end face of the second end plate is C2, which satisfies 0°≤C2≤80°.

14. An electric motor, comprising a rotor assembly, characterized in that, The rotor assembly is the rotor assembly as described in any one of claims 1 to 12.

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