ROTOR ASSEMBLY AND ENGINE WITH THE ROTOR ASSEMBLY

Abstract

This application discloses a rotor component and a motor therewith and relates to the field of motor technology. A rotor component comprises a rotor core and a shaft, wherein the rotor core is sheathed on the outside of the shaft. The rotor core includes several axially stacked rotor lamination groups, each of which includes several magnetic steel slot groups arranged at circumferential intervals. The structure of the magnetic steel slot groups differs in at least two rotor lamination groups. The rotor core is equipped with a first rotor oil circuit and a second rotor oil circuit, which are arranged in parallel. The first rotor oil circuit includes several first oil cooling channels located between adjacent magnetic steel slot groups. The second rotor oil circuit includes several second oil cooling channels, and the second oil cooling channel is formed by connecting to the expansion area of ​​the magnetic steel slot.An electric motor, including the rotor component. This application can increase the heat exchange efficiency of the rotor core, reduce the temperature of the rotor components, and improve the reliability and economy of the motor during operation.

Description

TECHNICAL AREA

[0001] This application belongs to the field of automotive parts technology and relates to the field of engine technology, in particular to a rotor component and an engine with it. BACKGROUND TECHNOLOGY

[0002] In light of the environmental pollution caused by vehicle exhaust, emissions regulations in various countries have become increasingly stringent in recent years, particularly in the automotive industry. This has led to the development of vehicles with alternative drive systems, designed to meet current demands and replace traditional combustion engines. As a key component of these vehicles, the operating efficiency and cost-benefit ratio of the drive motor have attracted considerable attention, with the motor's cooling system being of particular importance for both efficiency and cost-benefit.

[0003] With the current trend toward integrating numerous modern drive systems, oil-cooled motors are increasingly becoming the standard. Most existing oil cooling technologies focus on the stator core and end windings, but with the trend toward high-speed drive motors, the rotor core temperature has also come into focus. Reducing the rotor core temperature not only reduces magnet quality and utilization, thereby mitigating the structural risk to the rotor at high speeds, but also lowers the drive motor's material costs.

[0004] In related technologies, some oil-cooled motor heat dissipation structures can be divided into two heat dissipation paths. One path is the heat dissipation path from the stator core to the stator winding, and the other is the heat dissipation path from the rotor shaft to the end of the stator winding through the rotor core. The rotor's heat is dissipated via the rotor shaft through a one-piece oil channel running through the rotor core. However, the disadvantage of this structure is that while its heat dissipation design is simple, the rotor's heat dissipation effect is poor, resulting in low heat dissipation efficiency. To improve the inadequate heat dissipation of the aforementioned rotor oil circuit, other oil-cooled motor heat dissipation structures in related technologies employ a U-shaped rotor oil circuit, thereby increasing the length of the oil circuit at the rotor, which theoretically offers certain advantages for rotor heat dissipation.The tightly structured oil circuit at the rotor, particularly the oil circuit guide at the end, significantly increases pressure loss in the oil circuit. Furthermore, the high demand of the oil pumps reduces heat dissipation, indicating potential for improvement. BRIEF SUMMARY OF THE INVENTION

[0005] This application aims to address at least one of the aforementioned technical problems, at least to some extent. Therefore, this application proposes a rotor component and a motor that can mitigate the problem of the poor heat dissipation effect of the current rotor oil circuit structure and improve heat dissipation efficiency.

[0006] To solve the aforementioned technical problems, this registration is implemented as follows: According to one aspect of the present application, a rotor component is provided comprising a rotor core and a shaft, wherein the rotor core is sheathed on the outside of the shaft; The rotor core comprises several axially stacked rotor lamination stack groups, each of which is equipped with several magnetic steel slot groups arranged at circumferential intervals. The structure of the magnetic steel slot groups differs in at least two of the rotor lamination stack groups.

[0007] The rotor core is equipped with a first rotor oil circuit and a second rotor oil circuit, arranged in parallel. The first rotor oil circuit includes several first oil cooling channels, and the first oil cooling channel is located between two adjacent groups of magnetic steel grooves. The second rotor oil circuit includes several second oil cooling channels, and the second oil cooling channel is formed by connecting the expansion area of ​​the magnetic steel groove within the magnetic steel groove group.

[0008] In addition, the rotor component may also have the following additional technical features according to the present application: In some embodiments, the expansion section is arranged on one side of the magnetic steel grooves, and the expansion section is a groove; The positions of the slots in several rotor lamination stack groups are different.

[0009] In some embodiments, the slots in the rotor lamination stack group are arranged radially offset, and after assembling several rotor lamination stacks, the slots of each rotor lamination stack group are connected to each other to form the second oil cooling channel.

[0010] In some of these embodiments, each set of magnetic steel grooves includes two pairs of magnetic steel grooves, one of which is provided with a groove in the magnetic steel groove; and / or each magnetic steel groove group is W-shaped.

[0011] In some embodiments, the number of first oil cooling channels is A1 and the number of rotor poles in the rotor assembly is P, where A1 ≥ P; and / or the number of second oil cooling channels is B1 and the number of rotor poles in the rotor assembly is P, where B1 ≥ P.

[0012] In some of these embodiments, the first oil cooling channel is located between two adjacent groups of magnetic steel grooves and near the rotating shaft; the cross-section of the first oil cooling channel is elliptical, teardrop-shaped, triangular or polygonal with more than three sides.

[0013] In some embodiments, the second oil cooling channel is arranged on the opposite side of a pair of magnetic steel grooves; the fluid flow path in the second oil cooling channel is stepped, interrupted, V-shaped or W-shaped.

[0014] In some embodiments, the rotor core has a first end and a second end in the axial direction; the first oil cooling channel is connected to the first end and the second end, and a first oil inlet is formed at the first end and a first oil outlet at the second end; the second oil cooling channel is connected to the second end and the first end, and a second oil inlet is formed at the second end and a second oil outlet at the first end; and / or each rotor lamination stack group consists of several identical lamination stacks, and each rotor lamination stack group is provided with a first, axially extending oil bore. The first oil bores in the several rotor lamination stack groups are sequentially connected to form the first oil cooling channel.

[0015] 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 is connected to the shaft oil outlet bore and the first oil inlet bore of the rotating shaft, and the second oil inlet groove is connected to the shaft oil outlet bore and the second oil inlet bore of the rotating shaft.

[0016] In some embodiments, the shaft oil outlet bore includes a first shaft oil outlet bore near the first end plate and a second shaft oil outlet bore near the second end plate. The first oil inlet groove is connected to the first shaft oil outlet bore, and the second oil inlet groove is connected to the second shaft oil outlet bore; and / or the first end plate is further provided with a first oil outlet bore, and the second oil outlet groove is connected to both the second oil outlet and the first oil outlet bore of the end plate; the second end plate is also provided with a second oil outlet bore, and the first oil outlet groove is connected to both the first oil outlet and the second oil outlet bore of the end plate.

[0017] In some embodiments, the rotor assembly further includes a first end plate and a second end plate, and the structures of the first and second end plates may differ; the first end plate is equipped with a first oil inlet groove and a second oil outlet groove, and the second end plate is equipped with a first oil outlet bore and a second oil inlet groove. The first oil inlet groove is connected to the shaft oil outlet bore and the first oil inlet bore of the rotating shaft, and the second oil inlet groove is connected to the shaft oil outlet bore and the second oil inlet bore of the rotating shaft.

[0018] In some embodiments, the shaft oil outlet bore includes a first shaft oil outlet bore near the first end plate and a second shaft oil outlet bore near the second end plate. The first oil inlet groove is connected to the first shaft oil outlet bore, and the second oil inlet groove is connected to the second shaft oil outlet bore; and / or the first end plate is further provided with a first oil outlet bore, and the second oil outlet groove is connected to both the second oil outlet and the first oil outlet bore of the end plate; the first oil outlet communicates with the first oil outlet bore.

[0019] In some embodiments, the number of first and second shaft oil outlet bores is multiple, and the first and second shaft oil outlet bores are arranged uniformly along the circumference of the shaft; the first shaft oil outlet bore and the second shaft oil outlet bore are offset and arranged in an axial direction, or the first shaft oil outlet bore and the second shaft oil outlet bore are arranged according to the projection with a difference of 5° to 60°.

[0020] In some embodiments, the oil outlet bore of the first end plate is located near the outer edge of the first end plate, and the angle between the oil outlet bore of the first end plate and the end face of the first end plate is C1, and 0° ≤ C1 ≤ 80° is satisfied; the second oil outlet bore of the end plate or the first oil outlet bore is located near the outer edge of the second end plate, and the angle between the second oil outlet bore of the end plate or the first oil outlet bore and the end face of the second end plate is C2, and meets the requirements of 0° ≤ C2 ≤ 80°.

[0021] According to another aspect of the present application, an electric motor is provided which includes a rotor component, which is the aforementioned rotor component.

[0022] By applying the aforementioned technical solution, this application has at least the following advantages over the existing technology: The rotor core of the provided rotor assembly is equipped with a primary and a secondary rotor oil circuit. These circuits are arranged in parallel, and the multi-channel, parallel cooling system effectively cools both the rotor core and the magnets (magnetic steel) mounted on it. The primary oil circuit includes several cooling channels located between adjacent magnetic steel slot groups, thus enhancing the cooling effect on the rotor core. The different lamination stack groups within the rotor core feature varying magnetic steel slot structures, and the secondary oil circuit incorporates several additional cooling channels.The second oil cooling channel is formed by the expansion area of ​​the magnetic steel groove within the magnetic steel groove group. This groove not only cools the magnetic steel and reduces the temperature rise of the rotor's magnetic steel, but also imparts a specific, non-linear oil path direction to the second oil cooling channel. This helps to increase the contact area between the oil and the magnetic steel and improve the cooling effect on the magnetic steel. In this way, multiple oil cooling channels were implemented in the rotor core for the oil inlet, thereby increasing the heat dissipation area, achieving uniform heat dissipation, and improving heat dissipation efficiency.The heat dissipation structure of the rotor core's oil path in the oil circuit thus contributes to increasing the heat exchange efficiency between the oil and the rotor core and magnet (magnetic steel), reducing the temperature of the rotor components, and improving the reliability and economy of the motor during operation. DESCRIPTION OF THE ENCLOSED DRAWINGS Fig. Figure 1 is a schematic structure diagram of the rotor component disclosed in the present embodiment of the application; Fig. Figure 2 is a schematic diagram of the structure of a rotor iron core disclosed in the present embodiment of the application; Fig. Figure 3 is a schematic diagram of a further rotor iron core and a first end plate structure disclosed in the present embodiment of the application; Fig. Figure 4 is a schematic diagram of a further rotor iron core and a second end plate structure disclosed in the present embodiment of the application; Fig. Figure 5 is a schematic structural diagram of the first and second end plates of some embodiments of the present application; Fig. 5 (a) shows the schematic diagram of the first end plate, and Fig. 5 (b) shows the schematic diagram of the second end plate; Fig. Figure 6 shows a schematic diagram of the oil flow direction of the first and second oil cooling channels in some embodiments of the present application; Fig. Figure 6 (a) shows the schematic diagram of the first oil cooling channel, and Fig. Figure 6 (b) shows the schematic diagram of the second oil cooling channel; Fig. Figure 7 shows a schematic structure diagram of the first and second end plates of other embodiments of the present application; Fig. Figure 7 (a) shows the schematic diagram of the first end plate, and Fig. 7 (b) shows the schematic diagram of the second end plate; Fig. Figure 8 is a schematic diagram of the oil flow direction of the first and second oil cooling channels in other embodiments of the present application; Fig. Figure 8 (a) shows the schematic diagram of the first oil cooling channel, and Fig. Figure 8 (b) shows the schematic diagram of the second oil cooling channel; Fig. Figure 9 is a schematic diagram of the structure of the wave disclosed in the present embodiment of the application; Fig. Figure 10 is a schematic diagram of the structure of the first stack disclosed in the embodiment of the present application; Fig. Figure 11 is a schematic diagram of the structure of the second sheet metal package disclosed in the embodiment of the present application; Fig. Figure 12 is a schematic diagram of the structure of the third sheet metal package disclosed in the embodiment of the present application; Fig. Figure 13 is a schematic diagram of the structure of the fourth sheet metal stack disclosed in the embodiment of the present application.

[0023] Explanation of the markings in the attached drawing: 100- rotor core; 101- First rotor oil circuit; 110- First oil cooling channel; 111- First oil inlet; 112- First oil outlet; 102- Second rotor oil circuit; 120- Second oil cooling channel; 121- Second oil inlet; 122- Second oil outlet; 130- Rotor lamination pack group; 131- First rotor lamination pack group; 132- Second rotor lamination pack group; 133- Third rotor lamination pack group; 134- Fourth rotor lamination pack group; 1311- First lamination pack; 1321- Second lamination pack; 1331- Third lamination pack; 1341- Fourth lamination pack; 140- Magnetic steel groove group; 141- Magnetic steel groove; 1411- First magnetic steel groove; 1412- Groove; 200 - Rotating shaft; 210 - First shaft oil outlet bore; 220 - Second shaft oil outlet bore; 300- First end plate; 310- First oil inlet reservoir; 320- Second oil outlet groove; 330- Oil outlet bore of the first end plate; 400- Second end plate; 410- First oil outlet groove; 420- Second oil inlet reservoir; 430- Oil outlet bore of the second end plate; 440- First oil outlet. EXECUTION FORMS

[0024] See Fig. Figures 1 to 13. This embodiment provides a rotor assembly comprising a rotor, a first end plate 300, and a second end plate 400. The rotor includes a rotor core 100 and a shaft 200, and also includes permanent magnets such as magnet steel (not marked) mounted on the rotor core 100. In other words, the rotor includes a rotor core 100, a shaft 200, and magnet steel. The rotor core 100 may be sheathed on the outside of the shaft 200. When the shaft 200 is mated with the rotor core 100 and, for example, passes through the rotor core 100, the rotor core 100 has a shaft bore, and the shaft 200 passes through the shaft bore of the rotor core 100 and through the rotor core 100.

[0025] The rotor core 100 has a rotor oil circuit, and the shaft 200 can be equipped with a shaft oil outlet. The shaft oil outlet is connected to the rotor oil circuit, and cooling oil can enter the rotor oil circuit via the shaft oil outlet. The cooling oil in the rotor oil circuit can be divided into two paths: the first rotor oil circuit, which includes the first rotor oil circuit 101, and the second rotor oil circuit 102. The cooling oil in the first rotor oil circuit 101 can be used for heat dissipation from the rotor core 100, and the cooling oil in the second rotor oil circuit 102 can be used for heat dissipation from the magnet steel. The first rotor oil circuit 101 and the second rotor oil circuit 102 are arranged in parallel, which facilitates the arrangement of multi-layered oil circuits and allows for effective cooling of the permanent magnets and the multi-layered rotor core 100 by employing a cooling method with multiple parallel cooling oil circuits.

[0026] The first rotor oil circuit 101 consists of several first oil cooling channels 110, and the second rotor oil circuit 102 consists of several second oil cooling channels 120. Optionally, several first oil cooling channels 110 are evenly spaced along the circumference of the rotor core 100, and several first oil cooling channels 110 are arranged in parallel or parallel to each other; several second oil cooling channels 120 are evenly spaced, and several second oil cooling channels 120 are arranged in parallel or parallel to each other. In this way, the heat dissipation area can be increased and the uniformity of heat dissipation further improved by providing several first oil cooling channels 110 and several second oil cooling channels 120.In addition, the provision of several parallel first oil cooling channels 110, several parallel second oil cooling channels 120, and the provision of a parallel first rotor oil circuit 101 and a second rotor oil circuit 102 not only contributes to increasing the uniformity and effectiveness of heat dissipation, but also helps to reduce the power requirements for the oil pump and lower costs.

[0027] The rotor core 100 includes several axially stacked rotor lamination stack groups 130; that is, several axially stacked rotor lamination stack groups 130 can be built into the rotor core 100, and the assembly of several rotor lamination stack groups 130 together can form the rotor core 100 with the first rotor oil circuit 101 and the second rotor oil circuit 102. Each rotor lamination stack group 130 can be formed by stacking several rotor lamination stacks. Each rotor lamination stack group 130 is equipped with several magnet steel slot groups 140, which can be arranged at circumferential intervals along the rotor core 100.Each magnetic steel slot group 140 can consist of several magnetic steel slots 141; if the number of magnetic steel slot groups 140 is two or more, the structure of the magnetic steel slot 141 in the magnetic steel slot group 140 is different in at least two rotor lamination stack groups 130, that is, several magnetic steel slot groups 140 in two or more rotor lamination stack groups 130 have different structures in the magnetic steel slot 141. The first oil cooling channel 110 mentioned above is located between two adjacent magnetic steel slot groups 140, which can be used for cooling and heat dissipation of the rotor core 100; The magnetic steel groove has an expansion area and the second oil cooling channel 120 is formed by the connection of the expansion area of ​​the magnetic steel groove 141 in the magnetic steel groove group 140, which can be used for cooling and heat dissipation of the magnetic steel arranged in the magnetic steel groove 141.

[0028] It should be noted that in the embodiment of the present application, a multi-layered permanent magnet, i.e., a multi-layered magnetic steel, is arranged in the rotor assembly. The number of layers of the magnetic steel is greater than or equal to 1. For example, each rotor lamination stack group 130 is equipped with one layer of magnetic steel, and several rotor lamination stack groups 130 enclose several layers of magnetic steel. The number of rotor oil circuits in the rotor core 100 is greater than or equal to 2, wherein at least one rotor oil circuit is located between adjacent magnetic steel slot groups 140, i.e., between the poles of the magnetic steel, as in the first rotor oil circuit 101; and at least one rotor oil circuit is connected to the magnetic steel slot 141, as in the second rotor oil circuit 102.Therefore, the rotor oil circuit of the rotor core 100 includes, but is not limited to, the first rotor oil circuit 101 and the second rotor oil circuit 102, but can also be installed in the third rotor oil circuit, the fourth rotor oil circuit, etc., as required. Different rotor oil circuits can consist of several evenly distributed oil cooling channels, and a parallel connection between the different rotor oil circuits can be used. In this way, the parallel connection of several rotor oil circuits can better cool the multi-layered arrangement of magnetic steel and rotor iron core.

[0029] Based on the aforementioned features, using the rotor component of the present embodiment of the application, the rotor lamination stack group and the rotor oil circuit of the above structural form can increase the heat dissipation area, improve the uniformity of heat dissipation, and enhance the heat dissipation effect on the rotor core and the magnet steel, thus improving heat dissipation efficiency. More precisely, the first rotor oil circuit 101 and the second rotor oil circuit 102 are arranged in parallel in the provided rotor assembly, and the method of parallel cooling of multi-channel parallel oil circuits can better cool the rotor core and the magnet steel set on the rotor core. The first rotor oil circuit 101 includes several first oil cooling channels 110 located between two adjacent magnet steel groove groups 140.The first oil cooling channel 110 is located between the poles of the magnet steel and can cool the rotor core 100, thus contributing to an improved cooling effect on the rotor core 100. The different rotor lamination stack groups 130 in the rotor core 100 are equipped with different magnet steel slots 141. For example, the arrangement of the expansion area of ​​the magnet steel slot 141 can be slightly different, and the second rotor oil circuit 102 includes several secondary oil cooling channels 120, which are formed by connecting the expansion area of ​​the magnet steel slot 141 in the magnet steel slot group 140. This can be used not only to cool the magnet steel arranged in the magnet steel slot 141, but also to reduce the temperature rise of the rotor magnet steel.Furthermore, due to the different settings of the magnetic steel slots 141, the second oil cooling channel 120 can have a non-linear oil path direction, which helps to increase the contact area between the oil and the magnetic steel and improve the cooling effect on the magnetic steel. In this way, the oil inlet of multiple oil cooling channels of the rotor core 100 is achieved, the heat dissipation area is increased, uniform heat dissipation is achieved, and heat dissipation efficiency is improved. The oil path heat dissipation structure of the rotor core 100 thus contributes to increasing the heat exchange efficiency between the oil and the rotor core 100 as well as the magnetic steel, reducing the temperature of the rotor components and improving the reliability and economy of the motor during operation.

[0030] As in Fig. As shown in Figures 1 to 8, in some embodiments the rotor core 100 has a first end and a second end in the axial direction, the first oil cooling channel 110 is connected to the first end and the second end, and the first oil cooling channel forms a first oil inlet 111 at the first end, the first oil inlet 111 opens into the first oil cooling channel 110, the first oil outlet 112 is formed at the second end, and the oil supplied by the first oil cooling channel 110 exits. The second oil cooling channel 120 is connected to the second end and the first end, and the second oil cooling channel 120 forms a second oil inlet 121 at its second end. The second oil inlet 121 opens into the second oil cooling channel 120 and forms a second oil outlet 122 at its first end. The second oil outlet 122 flows from the second oil cooling channel 120. The first end mentioned above can be the left or front end, and the second end can be the right or rear end.

[0031] In this configuration, oil can be transported from the axial ends of the rotor core 100 into the interior of the rotor core 100. For example, the cooling oil of the first oil cooling channel 110 enters at the first end of the rotor core 100 and flows out at the second end. The cooling oil exchanges heat with the rotor core 100, thus providing heat dissipation. The cooling oil of the second oil cooling channel 120 enters at the second end of the rotor core 100 and flows out at the first end, exchanging heat with the magnetic steel to dissipate heat. By supplying oil separately from both ends of the rotor core 100, as opposed to supplying it from only one end, a more uniform heat dissipation can be achieved, thereby improving heat dissipation efficiency and increasing the heat dissipation effect.

[0032] The number of first oil cooling channels 110 mentioned above is multiple. Accordingly, multiple first oil cooling channels 110 form multiple first oil inlet ports 111 and multiple first oil outlet ports 112, with multiple first oil inlet ports 111 each being connected to multiple first oil outlet ports 112. The number of second oil cooling channels 120 mentioned above is multiple. Accordingly, multiple second oil cooling channels 120 form multiple second oil inlet ports 121 and multiple second oil outlet ports 122, and multiple second oil inlet ports 121 are each connected to multiple second oil outlet ports 122.

[0033] It should be emphasized that among the multiple first oil cooling channels 110, the corresponding first oil inlet openings 111 can all be located at the first end of the rotor core 100, and the first oil outlet openings 112 can all be located at the second end of the rotor core 100; among the multiple second oil cooling channels 120, the corresponding second oil inlet openings 121 can all be located at the second end of the rotor core 100, and the multiple second oil outlet openings 122 can all be located at the first end of the rotor core 100. This simplifies the design and contributes to increasing heat dissipation efficiency and effectiveness.

[0034] Additionally, in other embodiments, the inlet and outlet openings can also have different distribution patterns. For example, a section of the first oil inlet 111 is located at the first end of the rotor core 100, the remaining section of the first oil inlet 111 is located at the second end; a section of the first oil outlet 112 is located at the second end of the rotor core 100, and the remaining section of the first oil outlet 112 is located at the first end. A section of the second oil inlet 121 is located at the second end of the rotor core 100, the remaining section of the second oil inlet 121 is located at the first end; a section of the second oil outlet 122 is located at the first end of the rotor core 100, and the remaining section of the second oil outlet 122 is located at the second end. For example, the number of first oil cooling channels 110 is six.Among the first six oil cooling channels, there are three first oil inlet openings 111 at the first end, three first oil inlet openings 111 at the second end, three first oil outlet openings 112 at the second end and three first oil outlet openings at the first end.

[0035] In some embodiments, the rotor core 100 includes at least two different rotor stack groups 130, each consisting of several identical stack groups 130; that is, each rotor stack group 130 can be stacked from several stacks along the thickness direction, and the stacks in the same rotor stack group 130 can be configured as the same stack. There is no limit to the number of rotor lamination stack groups 130 and no limit to the number of lamination stacks within the rotor lamination stack groups 130. The configurations can be selected as required. The rotor core 100 consists of at least two types of lamination stack, such as at least two lamination stacks with different magnetic steel slots 141.

[0036] Each of the aforementioned rotor lamination stack groups 130 is equipped with a first, axially extending oil bore, and the first oil bores of several rotor lamination stack groups 130 are connected sequentially 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, a first oil outlet 112 at the second end, and the expansion area of ​​the magnet steel groove 141 in the magnet steel groove group 140 of the several rotor lamination stack groups 130 is connected to form a second oil cooling channel 120, and the second oil cooling channel 120 forms a second oil inlet opening 121 at the second end of the rotor core 100 and a second oil outlet opening 122 at the first end.

[0037] As an example, in this embodiment the rotor core 100 consists of four types of laminated core. These four types of laminated core are formed by different settings of the magnet steel slots 141, as shown in the Fig. Figures 10 to 13 are shown. The four types of lamination stack are the first lamination stack 1311, the second lamination stack 1321, the third lamination stack 1331, and the fourth lamination stack 1341.

[0038] As in Fig. As shown in Figure 2, in some embodiments the rotor core 100 comprises four sets of rotor lamination stack groups 130, namely the first rotor lamination stack group 131, the second rotor lamination stack group 132, the third rotor lamination stack group 133, and the fourth rotor lamination stack group 134, which are stacked sequentially in the axial direction. The lamination stacks in the first rotor lamination stack group 131, the second rotor lamination stack group 132, the third rotor lamination stack group 133, and the fourth rotor lamination stack group 134 are all different. The rotor core 100 thus consists of four types of lamination stack, with each type of lamination stack forming one set of rotor lamination stack groups. Simultaneously, by laminating the four types of lamination stack, four sets of rotor lamination stack groups 130 of equal length are formed, and the four sets of rotor lamination stack groups 130 of equal length are combined alternately to form a complete rotor core 100.

[0039] As in Fig. 1, Fig. 3 or Fig. As shown in Figure 4, in other embodiments the rotor core 100 includes eight sets of rotor lamination stack groups 130, namely the first rotor lamination stack group 131, the second rotor lamination stack group 132, the third rotor lamination stack group 133, the fourth rotor lamination stack group 134, the third rotor lamination stack group 133, the second rotor lamination stack group 132, and the first rotor lamination stack group 131, which are stacked sequentially in the axial direction. The lamination stacks in the second rotor lamination stack group 132, the third rotor lamination stack group 133, and the fourth rotor lamination stack group 134 are all different. The rotor core 100 thus consists of four types of lamination stack, with one type of lamination stack forming one set of rotor lamination stack groups 130. At the same time, the four types of lamination stack are laminated to form eight equally long rotor lamination stack groups 130, which are alternately combined to form a complete rotor core 100.

[0040] It is understood that in other embodiments the type of lamination stack and the number of rotor lamination stack groups can be 130 other, unlimited quantities.

[0041] In this embodiment, increasing the contact area between the cooling oil in the second cooling channel and the multilayer magnetic steel can be achieved by changing the structural setting of the magnetic steel slot 141 on the stack. For example, the magnetic steel slot 141 is equipped with an expansion area, and the position of the expansion area of ​​the magnetic steel slot can vary slightly on different stacks. In some embodiments, for example, each magnetic steel slot group 140 includes at least one pair of magnetic steel slots, with an expansion section, which may be a groove, located on one side of the magnetic steel slot 141.Furthermore, each pair of magnetic steel slots includes two magnetic steel slots 141 arranged at an angle, as well as an expansion area, namely a slot 1412, which is arranged on the opposite side of the two magnetic steel slots 141. The positions of the slots 1412 of the magnetic steel slots 141 in the multiple rotor lamination stack groups 130 are different. After the assembly of multiple rotor lamination stack groups 130, the slots 1412 of each rotor lamination stack group 130 are connected to form a second oil cooling channel 120.

[0042] In this embodiment, each magnetic steel slot group 140 includes two pairs of magnetic steel slots, wherein the magnetic steel slot 141 is provided in a pair of magnetic steel grooves with a groove 1412; each magnetic steel groove group 140 is a W-shaped groove, that is, both pairs of magnetic steel grooves are V-shaped grooves. The design of the magnetic steel slot 141 for the aforementioned lamination stack employs a special structural design, such as the use of a roughly W-shaped magnetic circuit design, which contributes to achieving a general improvement in motor performance. In this embodiment, there are six sets of magnetic steel slots 140 in the same stack, each of which is of the W type; the shape and arrangement of each magnetic steel slot group 140 can be the same, such as setting each magnetic steel slot group 140 as W-shaped or quasi-W-shaped.

[0043] Each magnet steel slot group 140 includes two pairs of magnet steel slots, such as a pair of first magnet steel slots 1411 and a pair of second magnet steel slots. A pair of first magnet steel slots 1411 may include two relatively larger magnet steel slots near the shaft 200, and a pair of second magnet steel slots may include two relatively smaller magnet steel slots near the edge of the lamination stack. The first pair of magnet steel slots 1 mentioned above.

[0044] The first end plate 300 is equipped with a first oil inlet groove 310 and a second oil outlet groove 320, and the second end plate 400 is equipped with a first oil outlet bore 440 and a second oil inlet groove 420. The first oil inlet groove 310 is connected to the shaft oil outlet bore and the first oil inlet 111, and the second oil inlet groove 420 is connected to the shaft oil outlet bore and the second oil inlet 121. The first oil inlet groove 310 of the first end plate 300 allows a connection between the shaft oil outlet bore and the first oil inlet 111 of the first oil cooling channel 110, i.e., a connection between the shaft oil outlet bore and the first rotor oil circuit 101 can be established. The connection between the shaft oil outlet bore and the second oil cooling channel 120 can be achieved through the second oil inlet groove 420 of the second end plate 400, i.e.The connection between the shaft oil outlet bore and the second rotor oil circuit 102 can be achieved.

[0045] The shaft oil outlet bore mentioned above includes a first shaft oil outlet bore 210 and a second shaft oil outlet bore 220. The first shaft oil outlet bore 210 is located near the first end plate 300, which is the first end of the rotor core 100, and the second shaft oil outlet bore 220 is located near the second end plate 400, which is the second end of the rotor core 100. The first oil inlet groove 310 is connected to the first shaft oil outlet bore 210 and the first oil inlet port 111, respectively, to supply oil to the first oil cooling channel 110; the second oil inlet groove 420 is connected to the second shaft oil outlet bore 220 and the second oil inlet port 121, respectively, to supply oil to the second oil cooling channel 120. Furthermore, the first end plate 300 is equipped with a first end plate oil outlet 330 and the second oil outlet 320 is connected to the second oil outlet 122 and the first end plate oil outlet 330 respectively.Oil flows out of the second oil cooling channel 120 and then through the second oil outlet 320 and the first oil outlet of the end plate 330; The first oil outlet 440 of the second end plate 400 is directly connected to the first oil outlet 112; The oil flows out of the first oil cooling channel 110 and then through the first oil outlet groove 410.

[0046] In comparison to the first embodiment described above, the structural arrangement of the second end plate 400 is different in the second embodiment, and the shape of the second oil cooling channel 120 is different. The oil flow direction in the first oil cooling channel 110 can be the same as in the first embodiment, as shown in Fig. 8 (a) shown, and is not repeated here. With regard to the direction of the oil in the second oil cooling channel 120, as shown in Fig. As shown in Figure 8(b), the cooling oil of the cooling system enters the interior of the shaft 200 through the shaft inlet opening and passes through the second shaft outlet opening 220, the second oil inlet groove 420, and the second oil inlet opening 121 into the second oil cooling channel 120, 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 reaching the cooling oil flow in the second oil cooling channel 120. The second oil cooling channel 120 is inclined.

[0047] In some embodiments, the number of first shaft oil outlet bores 210 and second shaft oil outlet bores 220 is multiple, and multiple first shaft oil outlet bores 210 and multiple second shaft oil outlet bores 220 are arranged evenly along the circumference of the shaft 200; the first shaft oil outlet bore 210 and the second shaft oil outlet bore 220 are arranged axially offset, or the first shaft oil outlet bore 210 and the second shaft oil outlet bore 220 are projected onto the same plane and are arranged with a difference of 5° - 60°.

[0048] As in Fig. As shown in Figure 9, the multiple first shaft oil outlet bores 210 are arranged near the first end plate 300, which is the first end of the rotor core 100, and the multiple first shaft oil outlet bores 210 are arranged evenly along the circumference of the shaft 200; the second shaft oil outlet bores 220 are arranged near the second end plate 400, which is the second end of the rotor core 100, and multiple second shaft oil outlet bores 220 are arranged evenly along the circumference of the shaft 200. Optionally, in this embodiment, the number of first shaft oil outlet bores 210 is 6 and the number of second shaft oil outlet bores 220 is also 6. Of course, in other embodiments, the number of first shaft oil outlet bores 210 and the number of second shaft oil outlet bores 220 can also be more than 6 or other quantities, without limitation.

[0049] The first shaft oil outlet bores 210 and the second shaft oil outlet bores 220 are offset in the axial direction of the shaft 200, which means that the first shaft oil outlet bores 210 and the second shaft oil outlet bores 220 are arranged in an offset manner. In other words, the first shaft oil outlet bores 210 and the second shaft oil outlet bores 220 may not be aligned with each other.

[0050] Optionally, the first shaft oil outlet bore 210 and the second shaft oil outlet bore 220 can be projected onto the same plane and arranged with an angular difference of 5° to 60°. Furthermore, the first shaft oil outlet bore 210 and the second shaft oil outlet bore 220 can be projected onto the same plane and arranged with an angular difference of 20° to 45°; for example, the first shaft oil outlet bore 210 and the second shaft oil outlet bore 220 can have an angular difference of 30° when projected onto the same plane. By facilitating the circulation of cooling oil in the first oil cooling channel 110 and the second oil cooling channel 120, the heat dissipation area can be increased, and the heat dissipation efficiency and uniformity can be improved.

[0051] As in the Fig. 5 or Fig.As shown in Figure 7, in some embodiments the first end-plate oil outlet bore 330 is located near the outer edge of the first end plate 300 and is connected to the second oil outlet groove 320 of the first end plate 300. The angle between the first end-plate oil outlet bore 330 and the end face 300 of the first end plate is C1 and 0° ≤ C1 ≤ 80° is satisfied; the second end-plate oil outlet bore 430 or the first oil outlet bore 440 is arranged near the outer edge of the second end plate 400, and the second end-plate oil outlet bore 430 is connected to the first oil outlet groove 410. The angle between the second end plate oil outlet bore 430 or the first oil outlet bore 440 and the end face of the second end plate 400 is C2 and meets the requirements of 0° ≤ C2 ≤ 80°.

[0052] It should be emphasized that the opening cross-section of the first endplate oil outlet bore 330 can be parallel to the end face of the first endplate 300 or inclined at a specific angle. For example, if the opening cross-section of the first endplate oil outlet bore 330 is parallel to the end face of the first endplate 300, the angle C1 above is 0°. Alternatively, the opening cross-section of the first endplate oil outlet bore 330 can be inclined relative to the end face of the first endplate 300, and the angle of inclination C1 can be greater than 0° and less than or equal to 80°. The angles C2 and C1 between the second endplate oil outlet bore 430 or first oil outlet bore 440 and the end face of the second endplate 400 have the same or a similar explanation and are not repeated here.

[0053] Optionally, the angle C1 between the first end plate oil outlet bore 330 and the end face of the first end plate 300 is 0°, 30°, 60°, 80° etc., preferably 0°.

[0054] Therefore, it is easier for the cooling oil to flow out of the second oil cooling channel 120, which has a simple structure and is easy to process.

[0055] Optionally, the angle C2 between the second end plate oil outlet bore 430 or the first oil outlet bore 440 and the end face of the second end plate 400 is 0°, 30°, 60°, 80°, etc., preferably 0°. Therefore, it is easier for the cooling oil to flow out of the first oil cooling channel 110, which has a simple structure and is easy to machine.

[0056] In summary, the rotor component of the present embodiment of the application increases the heat exchange efficiency between the oil and the rotor core and the magnet, significantly reduces the temperature of the rotor assembly and improves the reliability and economy of the motor during operation.

[0057] In some embodiments, a motor is also provided that includes the aforementioned rotor component. This embodiment achieves that, by adjusting the rotor components with the first rotor oil circuit 101 and the second rotor oil circuit 102, the heat dissipation efficiency and effect of the motor can be improved, thereby improving the reliability of the motor during operation.

Claims

[1] Rotor component, characterized by , that it comprises a rotor iron core and a shaft, wherein the rotor iron core is sheathed on the outside of the shaft, wherein the rotor core comprises several axially stacked rotor lamination stack groups, each of which is equipped with several magnet steel slot groups arranged at circumferential intervals, wherein the structure of the magnet steel slot groups is different in at least two of the rotor lamination stack groups, wherein the rotor core is equipped with a first rotor oil circuit and a second rotor oil circuit which are arranged in parallel, wherein the first rotor oil circuit comprises several first oil cooling channels and the first oil cooling channel is located between two adjacent magnetic steel groove groups, wherein the second rotor oil circuit comprises several second oil cooling channels, and wherein the second oil cooling channel is formed by connecting the expansion area of ​​the magnetic steel groove in the magnetic steel groove group. [2] Rotor component according to claim 1, characterized by , that the expansion area is located on one side of the magnet steel groove and the expansion area is a groove, with the positions of the grooves being different in several rotor lamination stack groups. [3] Rotor component according to claim 2, characterized by , that the slots in the rotor lamination stack group are arranged radially offset and, after the assembly of several rotor lamination stacks, the slots of each rotor lamination stack group are connected to each other to form the second oil cooling channel. [4] Rotor assembly according to claim 2, characterized by , that each magnetic steel slot group comprises two pairs of magnetic steel slots, wherein the magnetic steel slots in one pair of magnetic steel slots are provided with grooves, and / or each magnetic steel slot group is W-shaped. [5] Rotor assembly according to claim 1, characterized by, that the number of 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 second oil cooling channels is B1, and the number of poles of the rotor in the rotor assembly is P, where B1 ≥ P. [6] Rotor component according to claim 1, characterized by , that the first oil cooling channel is located between two adjacent groups of magnetic steel grooves and near the shaft, wherein the cross-section of the first oil cooling channel is elliptical, teardrop-shaped, triangular or polygonal with more than three sides. [7] Rotor component according to claim 1, characterized by , that the second oil cooling channel is arranged on one side opposite a pair of magnetic steel grooves, wherein the flow path of the fluid in the second oil cooling channel is stepped, interrupted, V-shaped or W-shaped. [8] Rotor assembly according to any one of claims 1 to 7, characterized by, that the rotor core has a first and a second end in the axial direction, the first oil cooling channel is connected to the first end and the second end and a first oil inlet is formed at the first end and a first oil outlet at the second end, wherein the second oil cooling channel is connected to the second end and the first end and a second oil inlet is formed at the second end and a second oil outlet is formed at the first end, and / or each rotor lamination stack group consists of several identical lamination stacks and each rotor lamination stack group is equipped with a first axially extending oil bore, wherein the first oil bores in the several rotor lamination stack groups are successively connected to each other to form the first oil cooling channel. [9] Rotor assembly according to claim 8, characterized by, that the rotor assembly further comprises a first end plate and a second end plate with the same structure, wherein the first end plate is equipped with a first oil inlet groove and a second oil outlet groove, and the second end plate is equipped with a first oil outlet groove and a second oil inlet groove, wherein the first oil inlet groove is connected to the shaft oil outlet bore and the first oil inlet bore of the rotating shaft, and the second oil inlet groove is connected to the shaft oil outlet bore and the second oil inlet bore of the rotating shaft. [10] Rotor component according to claim 9, characterized by, that the shaft oil outlet bore comprises a first shaft oil outlet bore near the first end plate and a second shaft oil outlet bore near the second end plate, wherein the first oil inlet groove is connected to the first shaft oil outlet bore and the second oil inlet groove is connected to the second shaft oil outlet bore, and / or wherein the first end plate is also provided with a first oil outlet bore and the second oil outlet groove is connected to the second oil outlet and the first oil outlet bore of the end plate, wherein the second end plate is also provided with a second oil outlet bore of the end plate and the first oil outlet groove is connected to the first oil outlet and the second oil outlet bore of the end plate. [11] Rotor assembly according to claim 8, characterized by, that the rotor assembly further comprises a first end plate and a second end plate, wherein the first end plate is equipped with a first oil inlet groove and a second oil outlet groove, and the second end plate is equipped with a first oil outlet bore and a second oil inlet groove, wherein the first oil inlet groove is connected to the shaft oil outlet bore and the first oil inlet bore of the rotating shaft, and the second oil inlet groove is connected to the shaft oil outlet bore and the second oil inlet bore of the rotating shaft. [12] Rotor component according to claim 11, characterized bythat the shaft oil outlet bore comprises a first shaft oil outlet bore near the first end plate and a second shaft oil outlet bore near the second end plate. The first oil inlet groove is connected to the first shaft oil outlet bore and the second oil inlet groove is connected to the second shaft oil outlet bore, and / or the first end plate is also equipped with a first oil outlet bore and the second oil outlet groove is connected to both the second oil outlet and the first oil outlet bore of the end plate, with the first oil outlet communicating with the first oil outlet bore. [13] Rotor assembly according to claim 10 or 12, characterized by, that the number of first shaft oil outlet bores and second shaft oil outlet bores is multiple and multiple first shaft oil outlet bores and multiple second shaft oil outlet bores are arranged uniformly along the circumference of the shaft, wherein the first shaft oil outlet bore and the second shaft oil outlet bore are offset and arranged in an axial direction, or the first shaft oil outlet bore and the second shaft oil outlet bore are arranged according to the projection with a difference of 5° to 60°. [14] Rotor component according to claim 10 or 12, characterized by, that the oil outlet bore of the first end plate is located near the outer edge of the first end plate and the angle between the oil outlet bore of the first end plate and the end face of the first end plate is C1 and meets the requirements of 0° ≤ C1 ≤ 80°, wherein the second oil outlet bore of the end plate or the first oil outlet bore is located near the outer edge of the second end plate and the angle between the second oil outlet bore of the end plate or the first oil outlet bore and the end face of the second end plate is C2 and meets the requirements of 0° ≤ C2 ≤ 80°. [15] Motor comprising a rotor assembly, characterized by that the rotor assembly is a rotor assembly according to one of claims 1 to 14.

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