Rotor assembly, electric machine and vehicle

Abstract

The utility model provides a kind of rotor assembly, motor and vehicle, it is related to vehicle technical field, rotor assembly includes rotor core, rotor core is equipped with multiple magnetic steel groove groups and multiple cooling oil channels, multiple magnetic steel groove groups and multiple cooling oil channels are evenly distributed along the circumference of rotor core, and are set one by one correspondingly;Magnetic steel groove group includes the first magnetic steel groove group and the second magnetic steel groove group being radially spaced apart along the rotor core, cooling oil channel includes first cooling oil channel and second cooling oil channel, and the setting position of first cooling oil channel and second cooling oil channel respectively corresponds with the first magnetic steel groove group and the second magnetic steel groove group in corresponding magnetic steel groove group;Cooling oil respectively flows into rotor core by first cooling oil channel and second cooling oil channel, to cool rotor core while also cooling magnetic steel installed in corresponding first magnetic steel groove group and second magnetic steel groove group respectively.This can improve the cooling efficiency and effect of double magnetic steel.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and more specifically, to a rotor assembly, a motor, and a vehicle. Background Technology

[0002] With the rapid development of new energy vehicles, drive motors are gradually developing towards higher torque performance, higher power density, and higher speed. At the same time, the cooling method of drive motors is also gradually upgrading from water cooling to oil cooling.

[0003] Currently, motor rotors are cooled by cooling oil channels that supply cooling to the rotor core and magnets. However, for rotor cores with a double V-shaped magnet slot design, the existing cooling oil channels have limited cooling effect on the magnets within the double V-shaped slots, resulting in poor magnet cooling and affecting motor performance. Utility Model Content

[0004] The problem this invention addresses is: how to improve the cooling effect of the magnets in the double V-shaped magnet slot.

[0005] To solve the above problems, this utility model provides a rotor assembly, a motor, and a vehicle.

[0006] In a first aspect, the present invention provides a rotor assembly, including a rotor core, wherein the rotor core is provided with a plurality of magnet slots and a plurality of cooling oil channels, wherein the plurality of magnet slots and the plurality of cooling oil channels are evenly distributed along the circumference of the rotor core and are arranged in a one-to-one correspondence. The magnet slot group includes a first magnet slot group and a second magnet slot group arranged radially at intervals along the rotor core. The cooling oil channel includes a first cooling oil channel and a second cooling oil channel. The positions of the first cooling oil channel and the second cooling oil channel correspond to the first magnet slot group and the second magnet slot group in the corresponding magnet slot group, respectively. Cooling oil flows into the rotor core through the first cooling oil channel and the second cooling oil channel, respectively, so as to cool the rotor core and the magnets installed in the corresponding first magnet slot group and the second magnet slot group, respectively.

[0007] Optionally, the first magnet slot group is located on the side of the second magnet slot group near the inner surface of the rotor core, and the first magnet slot group includes a first magnet slot and a second magnet slot. The ends of the first magnet slot and the second magnet slot away from the inner surface of the rotor core extend in a direction away from each other. The first cooling oil channel is disposed between the ends of the first magnet slot and the second magnet slot of the corresponding first magnet slot group near the inner surface of the rotor core, and the second cooling oil channel is disposed between the first magnet slot group and the second magnet slot group of the corresponding magnet slot group.

[0008] Optionally, the rotor assembly further includes an end plate assembly coaxially disposed with the rotor core. The end faces of both axial ends of the rotor core are respectively abutted against the end plate assembly. The end plate assembly is provided with multiple oil inlet grooves and multiple oil outlet holes, each of which corresponds to a plurality of cooling oil channels. The first cooling oil channel and the second cooling oil channel both penetrate the end faces of both axial ends of the rotor core. The oil inlet ends of the first cooling oil channel and the second cooling oil channel are respectively connected to the corresponding oil inlet grooves, and the oil outlet ends of the first cooling oil channel and the second cooling oil channel are respectively connected to the corresponding oil outlet holes. After the cooling oil flows into the oil inlet grooves, it flows into the rotor core through the corresponding first cooling oil channels and the second cooling oil channels, and flows out from the corresponding oil outlet holes.

[0009] Optionally, the end plate assembly includes a first end plate and a second end plate respectively disposed at both axial ends of the rotor core, the plurality of oil inlet grooves include a first oil inlet groove disposed on the first end plate and a second oil inlet groove disposed on the second end plate, the plurality of oil outlet holes include a first oil outlet hole disposed on the first end plate and a second oil outlet hole disposed on the second end plate, and the first oil inlet groove and the second oil inlet groove are respectively disposed opposite to the second oil outlet hole and the first oil outlet hole.

[0010] Optionally, the oil outlet is inclined relative to the axial direction of the rotor core, and the end of the oil outlet away from the rotor core is directed toward the stator winding.

[0011] Optionally, the end plate assembly is provided with a plurality of connecting slots, which are located on the side of the end plate assembly facing the rotor core and are respectively arranged in correspondence with a plurality of oil outlet holes. The connecting slot is located on the side of the corresponding oil outlet hole close to the central axis of the end plate assembly and is radially connected to the corresponding oil outlet hole along the rotor core. The oil outlet end of the first cooling oil channel is directly opposite to and connected to the corresponding connecting slot, and the oil outlet end of the second cooling oil channel is directly opposite to the corresponding oil outlet hole.

[0012] Optionally, the rotor assembly further includes a rotating shaft, which has a hollow cavity, a first oil passage and a second oil passage respectively communicating with the hollow cavity, and the first oil passage and the second oil passage are respectively connected to the first oil inlet groove and the second oil inlet groove; the cooling oil flowing into the hollow cavity includes two fluid paths, one of which flows sequentially through the first oil passage and the first oil inlet groove into the corresponding cooling oil passage and flows out from the corresponding second oil outlet hole, and the other of which flows sequentially through the second oil passage and the second oil inlet groove into the corresponding cooling oil passage and flows out from the corresponding first oil outlet hole.

[0013] Optionally, the rotor assembly further includes an oil injection pipe disposed within the hollow cavity. The oil injection pipe has a first oil hole and a second oil hole on its wall. The first oil hole is disposed opposite to the first oil passage and communicates with the hollow cavity. The second oil hole is disposed opposite to the second oil passage and communicates with the hollow cavity.

[0014] Secondly, this utility model provides an electric motor, including the rotor assembly described above.

[0015] Secondly, this utility model provides a vehicle including the motor described above.

[0016] The beneficial effects of the rotor assembly of this utility model are as follows: By uniformly arranging multiple magnetic slot groups, including a first magnetic slot group and a second magnetic slot group, along the circumference of the rotor core, and by spacing the first and second magnetic slot groups radially apart along the rotor core, a double magnetic slot design of the rotor core is achieved, making the rotor core suitable for motor rotors with double magnetic distribution. Furthermore, by providing multiple cooling oil channels on the rotor core that correspond one-to-one with the magnetic slot groups, the cooling oil flowing into the cooling oil channels can effectively cool the rotor core and the magnets installed in the magnetic slot groups. The steel is cooled, and the cooling oil channels are configured to include a first cooling oil channel and a second cooling oil channel. The positions of the first cooling oil channel and the second cooling oil channel are designed to correspond to the first and second magnet slots in the corresponding magnet slot groups, respectively. This allows the cooling oil flowing into the first and second cooling oil channels to cool the rotor core while also cooling the magnets installed in the first and second magnet slot groups, respectively. This ensures that the magnets in the dual magnet slots can be cooled nearby, thereby improving the cooling efficiency and effect of the dual magnets. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the rotor core structure in an embodiment of this utility model; Figure 2 This is a structural schematic diagram of the rotor core from another perspective in an embodiment of this utility model; Figure 3 This is a schematic diagram of the rotor assembly in an embodiment of the present invention; Figure 4 This is a schematic diagram of the end plate structure in an embodiment of the present utility model; Figure 5 This is a cross-sectional schematic diagram of the end plate in an embodiment of the present utility model; Figure 6 This is a cross-sectional schematic diagram of the rotor assembly in an embodiment of the present utility model; Figure 7 This is a schematic diagram of the rotor lamination structure in an embodiment of the present invention; Figure 8This is a partial structural diagram of the rotor lamination in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Rotor core; 11. Magnet slot group; 111. First magnet slot group; 1111. First magnet slot; 1112. Second magnet slot; 112. Second magnet slot group; 1121. Third magnet slot; 1122. Fourth magnet slot; 12. Cooling oil passage; 121. First cooling oil passage; 122. Second cooling oil passage; 13. Core section; 14. Rotor lamination; 141. Magnet hole group; 1411. First magnet hole group; 1411a. First magnet hole; 1411b. Second magnet hole; 1412. Second magnet hole group; 1412a. Third magnet hole; 1412b. Fourth magnet hole; 142. Cooling hole group; 1421, First cooling hole; 1422, Second cooling hole; 143, Air slot assembly; 1431, First air slot; 1432, Second air slot; 2, End plate assembly; 21, Oil inlet slot; 211, First oil inlet slot; 212, Second oil inlet slot; 213, First slot section; 214, Second slot section; 22, Oil outlet hole; 221, First oil outlet hole; 222, Second oil outlet hole; 23, Connecting slot; 24, First end plate; 25, Second end plate; 3, Rotating shaft; 31, Hollow cavity; 32, First oil passage; 33, Second oil passage; 4, Fuel injection pipe; 41, First oil hole; 42, Second oil hole; 5, Oil baffle ring; 6, Magnet; c. Second magnetic bridge; d. Third magnetic bridge; e. Fourth magnetic bridge; f. Fifth magnetic bridge; g. Sixth magnetic bridge; h. Seventh magnetic bridge. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] In related technologies, the motor rotor uses cooling oil channels to cool the rotor core and magnets. However, for rotor cores with a double V-shaped magnet slot design, the existing cooling oil channels have limited cooling effect on the magnets within the double V-shaped slots, resulting in poor magnet cooling and affecting motor performance.

[0023] To address the problems existing in the aforementioned related technologies, this utility model provides a rotor assembly, a motor, and a vehicle.

[0024] Combination Figure 1 As shown, a rotor assembly of this utility model includes a rotor core 1. The rotor core 1 is provided with a plurality of magnet slot groups 11 and a plurality of cooling oil channels 12. The plurality of magnet slot groups 11 and the plurality of cooling oil channels 12 are evenly distributed along the circumference of the rotor core 1 and are arranged in a one-to-one correspondence. The magnet slot group 11 includes a first magnet slot group 111 and a second magnet slot group 112 arranged radially at intervals along the rotor core 1. The cooling oil channel 12 includes a first cooling oil channel 121 and a second cooling oil channel 122. The positions of the first cooling oil channel 121 and the second cooling oil channel 122 correspond to the first magnet slot group 111 and the second magnet slot group 112 in the corresponding magnet slot group 11. Cooling oil flows into the rotor core 1 through the first cooling oil channel 121 and the second cooling oil channel 122, so as to cool the rotor core 1 and the magnets 6 installed in the corresponding first magnet slot group 111 and the second magnet slot group 112 at the same time.

[0025] Specifically, the first magnet slot group 111 and the second magnet slot group 112 can both be V-shaped magnet slot structures. In this case, the magnets 6 are distributed in a double V structure on the rotor core 1. Alternatively, the first magnet slot group 111 and the second magnet slot group 112 can be a combination of an "I"-shaped magnet slot structure and a V-shaped magnet slot structure. In this case, the magnets 6 are distributed in an "I"-shaped + single V structure on the rotor core 1. The first cooling oil passage 121 and the second cooling oil passage 122 can be arranged radially at intervals along the rotor core 1, that is, the first cooling oil passage 121 and the second cooling oil passage 122 are aligned in the same radial direction to facilitate the design of the cooling oil passage 12 in the radial direction of the symmetrical plane of the magnet slot group 11, thereby facilitating processing. Both ends of the first cooling oil passage 121 and the second cooling oil passage 122 can penetrate the end faces of both axial ends of the rotor core 1, so that cooling oil can flow into the rotor core 1 from one end of the first cooling oil passage 121 and the second cooling oil passage 122, and flow out of the rotor core 1 from the other end of the first cooling oil passage 121 and the second cooling oil passage 122. The positions of the first cooling oil passage 121 and the second cooling oil passage 122 correspond to the first magnet slot group 111 and the second magnet slot group 112 in the corresponding magnet slot group 11. It can be understood that the first cooling oil passage 121 is located near the first magnet slot group 111 of the corresponding magnet slot group 11, and the second cooling oil passage 122 is located near the second magnet slot group 112 of the corresponding magnet slot group 11. For example, the first cooling oil passage 121 can be located at the magnetic bridge between the two magnet slots of the first magnet slot group 111, which has a V-shaped magnet slot structure (i.e., as described later). Alternatively, the first cooling oil channel 121 can be located on the side of the first magnet slot group 111 that is close to or far from the inner circumferential surface of the rotor core 1 (i.e., the inner circumferential surface of the annular rotor core 1), and the radial distance between the first magnet slot group 111 and the first cooling oil channel 121 can be small, so that the cooling oil flowing into the first cooling oil channel 121 can cool the rotor core 1 and also cool the magnets 6 in the first magnet slot group 111 nearby. Similarly, the second cooling oil channel 122 can be set in the same way as the first cooling oil channel 121, which will not be described again here.

[0026] In this embodiment, a plurality of magnet slot groups 11, including a first magnet slot group 111 and a second magnet slot group 112, are uniformly arranged along the circumference of the rotor core 1, and the first magnet slot group 111 and the second magnet slot group 112 of each magnet slot group 11 are arranged at radial intervals along the rotor core 1 to achieve a double magnet slot design of the rotor core 1, so that the rotor core 1 can be used for motor rotors with double magnet distribution; moreover, by providing a plurality of cooling oil channels 12 on the rotor core 1 that correspond one-to-one with the magnet slot groups 11, the cooling oil flowing into the cooling oil channels 12 can be used to cool the rotor core 1 and the magnets 6 installed in the magnet slot groups 11. Meanwhile, by setting the cooling oil passage 12 to include a first cooling oil passage 121 and a second cooling oil passage 122, and designing the positions of the first cooling oil passage 121 and the second cooling oil passage 122 to correspond to the first magnet slot group 111 and the second magnet slot group 112 in the corresponding magnet slot group 11, the cooling oil flowing into the first cooling oil passage 121 and the second cooling oil passage 122 can cool the rotor core 1 while also cooling the magnets 6 installed in the first magnet slot group 111 and the second magnet slot group 112 respectively. This ensures that the magnets 6 in the double magnet slots can be cooled nearby, thereby improving the cooling efficiency and effect of the double magnets.

[0027] Optionally, combined Figure 2 As shown, the first magnet slot group 111 is located on the side of the second magnet slot group 112 near the inner surface of the rotor core 1, and the first magnet slot group 111 includes a first magnet slot 1111 and a second magnet slot 1112. The ends of the first magnet slot 1111 and the second magnet slot 1112 away from the inner surface of the rotor core 1 extend in a direction away from each other. The first cooling oil channel 121 is disposed between the ends of the first magnet slot 1111 and the second magnet slot 1112 of the corresponding first magnet slot group 111 near the inner surface of the rotor core 1, and the second cooling oil channel 122 is disposed between the first magnet slot group 111 and the second magnet slot group 112 of the corresponding magnet slot group 11.

[0028] In this optional embodiment, the ends of the first magnet slot 1111 and the second magnet slot 1112 that are away from the inner surface of the rotor core 1 extend away from each other, so that the first magnet slot 1111 and the second magnet slot 1112 constituting the first magnet slot group 111 have a V-shaped magnet slot structure. By setting the first cooling oil channel 121 between the ends of the corresponding first magnet slot 1111 and the second magnet slot 1112 that are close to the inner surface of the rotor core 1, the distance between the first magnet slot 1111 and the first cooling oil channel 121 is the same as or almost the same as the distance between the second magnet slot 1112 and the first cooling oil channel 121, thereby ensuring that the magnets 6 in the first magnet slot group 111 can be cooled uniformly. Furthermore, since the second magnet slot group 112 is usually located close to the circumferential outer surface of the rotor core 1, that is, the distance between the second magnet slot group 112 and the circumferential outer surface of the rotor core 1 is small, if the second cooling oil channel 122 is located on the side of the second magnet slot group 112 close to the circumferential outer surface of the rotor core 1, the cross-section of the second cooling oil channel 122 will be small. Therefore, in this embodiment, the second cooling oil channel 122 is located between the corresponding first magnet slot group 111 and second magnet slot group 112 to increase the cross-section of the second cooling oil channel 122, thereby increasing the contact area between the second cooling oil channel 122 and the cooling oil and improving the cooling effect of the magnet 6 installed in the second magnet slot group 112.

[0029] Optionally, combined Figures 3 to 6 As shown, the rotor assembly also includes an end plate assembly 2 coaxially arranged with the rotor core 1. The end faces of both axial ends of the rotor core 1 are respectively attached to the end plate assembly 2. The end plate assembly 2 is provided with multiple oil inlet grooves 21 and multiple oil outlet holes 22. The multiple oil inlet grooves 21 and multiple oil outlet holes 22 are respectively arranged in correspondence with multiple cooling oil channels 12. The first cooling oil channel 121 and the second cooling oil channel 122 both penetrate the end faces of both axial ends of the rotor core 1. The oil inlet ends of the first cooling oil channel 121 and the second cooling oil channel 122 are respectively connected to the corresponding oil inlet grooves 21, and the oil outlet ends of the first cooling oil channel 121 and the second cooling oil channel 122 are respectively connected to the corresponding oil outlet holes 22. After the cooling oil flows into the oil inlet groove 21, it flows into the rotor core 1 through the corresponding first cooling oil channel 121 and the second cooling oil channel 122, and flows out from the corresponding oil outlet holes 22.

[0030] In this optional embodiment, the end plate assembly 2 includes two end plates, namely the first end plate 24 and the second end plate 25, which will be described later. The two end plates are located at the two axial ends of the rotor core 1, and the end faces of the two axial ends of the rotor core 1 are respectively attached to the end plate assembly 2. This can be understood as the two end plates constituting the end plate assembly 2 being attached to the end faces of the two axial ends of the rotor core 1. The end plate assembly 2 is provided with multiple oil inlet grooves 21 and multiple oil outlet holes 22. The oil inlet grooves 21, oil outlet holes 22 and cooling oil channels 12 are arranged in a one-to-one correspondence. In each cooling oil channel 12, the oil inlet end of the first cooling oil channel 121 and the second cooling oil channel 122 are respectively connected to the corresponding oil inlet groove 21, and the oil outlet end of the first cooling oil channel 121 and the second cooling oil channel 122 are respectively connected to the corresponding oil outlet hole 22. This allows the cooling oil flowing into the oil inlet groove 21 to be divided into two paths. One path flows into the corresponding first cooling oil channel 121 to cool the rotor core 1 and the magnet 6 installed in the corresponding first magnet slot group 111. The other path flows into the corresponding second cooling oil channel 122 to cool the rotor core 1 and the magnet 6 installed in the corresponding second magnet slot group 112. The cooling oil flowing out from the corresponding first cooling oil channel 121 and the second cooling oil channel 122 converges at the corresponding oil outlet hole 22 and is sprayed from the oil outlet hole 22 onto the stator winding. For example, in one example, each end plate may be provided with multiple oil inlet grooves 21 and multiple oil outlet holes 22. In this case, the sum of the number of oil inlet grooves 21 on the two end plates is the number of oil inlet grooves 21 of the end plate assembly 2, and the sum of the number of oil outlet holes 22 on the two end plates is the number of oil outlet holes 22 of the end plate assembly 2. This allows cooling oil to flow from the oil inlet grooves 21 on the first end plate 24 into the rotor core 1 and out through the oil outlet holes 22 on the second end plate 25. At the same time, cooling oil also flows from the oil inlet grooves 21 on the second end plate 25 into the rotor core 1 and out through the oil outlet holes 22 on the first end plate 24. That is, a portion of the cooling oil in the cooling oil channel 12 flows in from one axial end of the rotor core 1 and out from the other axial end, while another portion of the cooling oil in the cooling oil channel 12 flows in from the other axial end of the rotor core 1 and out from one axial end. In another example, one end plate may be provided with multiple oil inlet grooves 21 and another end plate may be provided with multiple oil outlet holes 22. In this case, all the oil inlet grooves 21 of the end plate assembly 2 are provided on one end plate and all the oil outlet holes 22 are provided on the other end plate, so that the flow direction of the cooling oil in all the cooling oil channels 12 is the same, that is, the cooling oil flows in from one axial end of the rotor core 1 and flows out from the other axial end.

[0031] In this way, cooling oil can flow from the oil inlet groove 21 on the end plate assembly 2 into the cooling oil passage 12 of the rotor core 1, and flow out from the oil outlet hole 22 on the end plate assembly 2 to spray onto the stator winding to cool the stator winding.

[0032] Optionally, combined Figures 4 to 6As shown, the end plate assembly 2 includes a first end plate 24 and a second end plate 25 respectively disposed at both axial ends of the rotor core 1. The plurality of oil inlet grooves 21 include a first oil inlet groove 211 disposed on the first end plate 24 and a second oil inlet groove 212 disposed on the second end plate 25. The plurality of oil outlet holes 22 include a first oil outlet hole 221 disposed on the first end plate 24 and a second oil outlet hole 222 disposed on the second end plate 25. The first oil inlet groove 211 and the second oil inlet groove 212 are respectively positioned opposite to the second oil outlet hole 222 and the first oil outlet hole 221.

[0033] It should be noted that, Figure 6 The red arrows in the diagram indicate the flow path of the cooling oil.

[0034] In this way, cooling oil can flow into the rotor core 1 from the first oil inlet groove 211 on the first end plate 24 and out from the second oil outlet hole 222 on the second end plate 25. At the same time, cooling oil also flows into the rotor core 1 from the second oil inlet groove 212 on the second end plate 25 and out from the first oil outlet hole 221 on the first end plate 24, so that a bidirectional cooling path with opposite flow direction is formed on the rotor core 1, thereby improving the uniformity of cooling of the rotor core 1 and the magnet 6.

[0035] Optionally, combined Figure 5 and Figure 6 As shown, the oil outlet 22 is axially inclined relative to the rotor core 1, and the end of the oil outlet 22 away from the rotor core 1 is directed toward the stator winding. This allows the cooling oil ejected from the oil outlet 22 to be evenly sprayed onto the middle of the stator winding, thereby cooling the inner ring of the stator winding. Specifically, in one example, the oil outlet 22 may be axially inclined entirely relative to the rotor core 1. In other examples, the two holes of the oil outlet 22 along the radial direction of the rotor core 1 are a first hole wall and a second hole wall, respectively. The second hole wall is located on the side of the first hole wall near the circumferential outer surface of the end plate assembly 2 and is axially inclined relative to the rotor core 1. The end of the second hole wall away from the rotor core 1 extends radially away from the first hole wall, meaning the first hole wall is parallel to the axial direction of the rotor core 1, and the second hole wall is axially inclined relative to the rotor core 1.

[0036] Optionally, combined Figure 4 and Figure 5 As shown, the end plate assembly 2 is provided with multiple connecting grooves 23. The multiple connecting grooves 23 are located on the side of the end plate assembly 2 facing the rotor core 1, and are respectively arranged with multiple oil outlet holes 22. The connecting grooves 23 are located on the side of the corresponding oil outlet hole 22 close to the central axis of the end plate assembly 2, and are connected to the corresponding oil outlet hole 22 radially along the rotor core 1. The oil outlet end of the first cooling oil channel 121 is directly opposite to and connected with the corresponding connecting groove 23, and the oil outlet end of the second cooling oil channel 122 is directly opposite to the corresponding oil outlet hole 22.

[0037] It should be noted that since the end plate assembly 2 is composed of two coaxially arranged end plates (i.e., the first end plate 24 and the second end plate 25), the central axis of the end plate assembly 2 is also the central axis of the first end plate 24 or the second end plate 25.

[0038] In this optional embodiment, the connecting groove 23 is disposed on the side of the first end plate 24 and / or the second end plate 25 facing the rotor core 1. In this way, by aligning the oil outlet end of the second cooling oil passage 122 with the corresponding oil outlet hole 22, and connecting the oil outlet end of the first cooling oil passage 121 with the oil outlet hole 22 using the connecting groove 23, the opening area of ​​the oil outlet hole 22 can be reduced, thereby improving production efficiency.

[0039] Optionally, combined Figure 4 As shown, both the first oil inlet groove 211 and the second oil inlet groove 212 include a first groove segment 213 and a second groove segment 214 that are sequentially connected radially along the rotor core 1. The end of the first groove segment 213 away from the second groove segment 214 extends to the circumferential inner surface of the end plate assembly 2 (i.e., the inner circumferential surface of the annular end plate assembly 2). The second groove segment 214 is directly opposite to the oil inlet end of the corresponding cooling oil passage 12, and the groove width of the second groove segment 214 is greater than the groove width of the first groove segment 213. Here, the groove width of the first groove segment 213 and the second groove segment 214 refers to the circumferential dimensions of the first groove segment 213 and the second groove segment 214 along the rotor core 1. In this way, the capacity of the cooling oil at the second groove segment 214 can be increased, thereby increasing the amount of cooling oil flowing into the cooling oil passage 12 and improving the cooling effect.

[0040] Optionally, combined Figure 6 As shown, the rotor assembly also includes a rotating shaft 3. The rotating shaft 3 is provided with a hollow cavity 31, a first oil passage 32 and a second oil passage 33 respectively connected to the hollow cavity 31, and the first oil passage 32 and the second oil passage 33 are respectively connected to the first oil inlet groove 211 and the second oil inlet groove 212. The cooling oil flowing into the hollow cavity 31 includes two flow paths. One path flows into the corresponding cooling oil passage 12 through the first oil passage 32 and the first oil inlet groove 211 in sequence, and flows out from the corresponding second oil outlet 222. The other path flows into the corresponding cooling oil passage 12 through the second oil passage 33 and the second oil inlet groove 212 in sequence, and flows out from the corresponding first oil outlet 221.

[0041] Specifically, the rotating shaft 3 has a hollow shaft structure, and its internal cavity forms a hollow cavity 31. Moreover, one end of the hollow cavity 31 is usually open. By pressing an oil baffle ring 5 into the open end of the hollow cavity 31, oil is blocked to prevent cooling oil from flowing out from the open end of the hollow cavity 31. The first oil passage 32 and the second oil passage 33 can be oil holes. In this case, the rotating shaft 3 is provided with multiple oil holes, and each first oil inlet groove 211 and each second oil inlet groove 212 corresponds to one oil hole. The first oil passage 32 and the second oil passage 33 can also be annular oil grooves. In this case, the rotating shaft 3 is provided with two annular oil grooves, and multiple first oil inlet grooves 211 are connected to one annular oil groove, and multiple second oil inlet grooves 212 are connected to the other annular oil groove.

[0042] In this way, the cooling oil in the rotating shaft 3 is guided to the cooling oil passage 12 to cool the rotor core 1 and the magnet 6.

[0043] Optionally, combined Figure 6 As shown, the rotor assembly also includes an oil injection pipe 4 disposed in the hollow cavity 31. The pipe wall of the oil injection pipe 4 is provided with a first oil hole 41 and a second oil hole 42. The first oil hole 41 is disposed opposite to the first oil passage 32 and communicates with the hollow cavity 31. The second oil hole 42 is disposed opposite to the second oil passage 33 and communicates with the hollow cavity 31.

[0044] In this way, by using the oil injection pipe 4 with the first oil hole 41 and the second oil hole 42 to deliver the cooling oil to the rotating shaft 3, on the one hand, it is possible to avoid setting up a cooling oil passage on, for example, the motor housing to deliver the cooling oil to the rotating shaft 3, thereby simplifying the cooling structure of the motor rotor. On the other hand, regardless of whether the motor is running at low or high speed, the amount of cooling oil flowing into the hollow cavity 31 from the first oil hole 41 and the second oil hole 42 is almost the same, thereby ensuring that the cooling oil can be evenly distributed at any speed.

[0045] Optionally, combined Figure 3 As shown, the rotor core 1 includes multiple core segments 13, each core segment 13 is provided with multiple cooling channels, and the multiple cooling channels of the multiple core segments 13 are connected to form multiple cooling oil channels 12. In two adjacent core segments 13, one core segment 13 is deflected by a preset angle relative to the other core segment 13 along the circumference of the rotor core 1.

[0046] In this optional embodiment, taking the core segment 13 adjacent to the first end plate 24 as a reference, the deflection directions of the remaining core segments 13 relative to the reference core segment in the circumferential direction can be the same or opposite. For example, in one example, the remaining core segments 13 can all be deflected 2.5° in a counterclockwise or clockwise direction relative to the reference core segment. In this case, multiple core segments 13 form a slanted "I"-shaped slanted pole structure, and multiple cooling channels constituting a cooling oil passage 12 are sequentially staggered 2.5° circumferentially; in another example, such as Figure 3As shown, alternatively, a portion of the remaining core segments 13 may be deflected 2.5° clockwise or counterclockwise relative to the reference core segment, while another portion remains undeflected relative to the reference core segment. These two portions of core segments 13 are alternately arranged; that is, the core segments 13 deflected 2.5° clockwise or counterclockwise alternate with the undeflected core segments 13. In this case, multiple core segments 13 form a single "V" or multiple "V" shaped skewed pole structure, which can effectively improve the second-order torsional mode, reduce vibration response, and improve the NVH performance of the motor. Furthermore, the multiple cooling channels constituting a cooling oil passage 12 are alternately staggered. Figure 3 The red dashed lines in the diagram represent the deflection positions of the cooling channels forming the same cooling oil passage 12 on each core segment 13. This results in a stepped oil passage structure for the cooling oil passage 12, allowing the cooling oil flowing into the cooling oil passage 12 to contact the cross-section of the rotor core 1, thereby increasing the contact area between the rotor core 1 and the cooling oil and improving the cooling effect.

[0047] Furthermore, combined Figure 7 As shown, the core section 13 includes multiple rotor laminations 14 stacked along its axial direction. Each rotor lamination 14 has multiple sets of magnet holes 141 and multiple sets of cooling holes 142. The multiple sets of magnet holes 141 of the multiple rotor laminations 14 form multiple sets of magnet slots 11, and the multiple sets of cooling holes 142 of the multiple rotor laminations 14 form multiple cooling oil channels 12. Each set of magnet holes 141 includes first sets of magnet holes 1411 and second sets of magnet holes 1412 arranged radially apart along the rotor laminations 14. Each set of cooling holes 142 includes first cooling holes 1421 and second cooling holes 1422. The multiple first sets of magnet holes 1411 of the multiple rotor laminations 14 form multiple sets of first magnet slots 111, and the multiple sets of second magnet holes 1412 of the multiple rotor laminations 14 form multiple sets of second magnet slots 112. Multiple first cooling holes 1421 of the lamination 14 form multiple first cooling oil channels 121, and multiple second cooling holes 1422 of the rotor lamination 14 form multiple second cooling oil channels 122; each first magnet hole group 1411 includes a first magnet hole 1411a and a second magnet hole 1411b. In the direction from the center of the rotor lamination 14 to the edge of the rotor lamination 14, the first magnet hole 1411a and the second magnet hole 1411b extend away from each other. A first magnetic bridge is formed between the ends of the first magnet hole 1411a and the second magnet hole 1411b near the center of the rotor lamination 14. The first cooling hole 1421 is disposed at the corresponding first magnetic bridge, and the second cooling hole 1422 is disposed between the corresponding first magnet hole group 1411 and the second magnet hole group 1412.

[0048] Furthermore, combined Figure 8As shown, the ends of the first magnet hole 1411a and the second magnet hole 1411b near the center of the rotor lamination 14 form a second magnetic bridge c with the first cooling hole 1421. The thickness of the second magnetic bridge c increases from the middle position to both ends. The thickness of the second magnetic bridge c refers to its circumferential dimension in the rotor lamination 14. Compared to designing the second magnetic bridge c to have a uniform thickness, this embodiment improves the structural strength of the second magnetic bridge c by designing its thickness to increase from the middle position to both ends, thereby reducing magnetic leakage and increasing torque.

[0049] Furthermore, combined Figure 8 As shown, the ends of the first magnet hole 1411a and the second magnet hole 1411b near the edge of the rotor lamination 14 form a third magnetic bridge d and a fourth magnetic bridge e, respectively, between the edge of the rotor lamination 14. The thickness of the third magnetic bridge d increases in a predetermined direction, and the thickness of the fourth magnetic bridge e decreases in a predetermined direction. The thickness of the third magnetic bridge d and the fourth magnetic bridge e refers to their radial dimensions in the rotor lamination 14, and the predetermined direction is opposite to the rotation direction of the rotor lamination 14. This is different from designing the third magnetic bridge d and the fourth magnetic bridge e to have equal thickness. By designing the thickness of the third magnetic bridge d to increase in a direction opposite to the rotation direction of the rotor lamination 14 (i.e., decreasing in the rotation direction of the rotor lamination 14), and the thickness of the fourth magnetic bridge e to decrease in a direction opposite to the rotation direction of the rotor lamination 14 (i.e., increasing in the rotation direction of the rotor lamination 14), the structural strength at the third magnetic bridge d and the fourth magnetic bridge e can be improved while reducing leakage flux and increasing torque.

[0050] Furthermore, combined Figure 8As shown, each second magnet hole group 1412 includes a third magnet hole 1412a and a fourth magnet hole 1412b. In the direction from the center of the rotor lamination 14 to the edge of the rotor lamination 14, the third magnet hole 1412a and the fourth magnet hole 1412b extend away from each other. The ends of the third magnet hole 1412a and the fourth magnet hole 1412b near the edge of the rotor lamination 14 respectively form a fifth magnetic bridge f and a sixth magnetic bridge g between the edge of the rotor lamination 14. The thickness of the fifth magnetic bridge f increases along a set direction, and the thickness of the sixth magnetic bridge g decreases along a set direction. The thickness of the fifth magnetic bridge f and the sixth magnetic bridge g refers to the radial dimensions of the fifth magnetic bridge f and the sixth magnetic bridge g in the rotor lamination 14. Compared to designing the fifth magnetic bridge f and the sixth magnetic bridge g to have the same thickness, this design increases the thickness of the fifth magnetic bridge f in the opposite direction to the rotation direction of the rotor lamination 14, i.e., decreases in the rotation direction of the rotor lamination 14, and decreases the thickness of the sixth magnetic bridge g in the opposite direction to the rotation direction of the rotor lamination 14, i.e., increases in the rotation direction of the rotor lamination 14. This improves the structural strength of the fifth magnetic bridge f and the sixth magnetic bridge g while reducing leakage flux and increasing torque.

[0051] Furthermore, combined Figure 8 As shown, a seventh magnetic bridge h is formed between the ends of the third magnetic hole 1412a and the fourth magnetic hole 1412b near the center of the rotor lamination. The thickness of the seventh magnetic bridge h increases from the middle position to both ends. The thickness of the seventh magnetic bridge h refers to its circumferential dimension in the rotor lamination 14. Compared to designing the seventh magnetic bridge h to have a uniform thickness, this embodiment improves the structural strength of the seventh magnetic bridge h by designing its thickness to increase from the middle position to both ends, thereby reducing leakage flux, increasing torque, and simultaneously improving the structural strength of the seventh magnetic bridge h.

[0052] Furthermore, combined Figure 8 As shown, the rotor lamination 14 is also provided with multiple air slot groups 143, which are arranged one-to-one with multiple magnet hole groups 141, and the air slot groups 143 are located between the first magnet hole 1411a and the second magnet hole 1411b of the corresponding magnet hole group 141. Specifically, along the circumference of the rotor lamination 14, the air slot groups 143 are located in the area between the first magnet hole 1411a and the second magnet hole 1411b. The air slot groups 143 can be composed of one or more air slots. The opening area of ​​the air slots is usually relatively small, and there is no need to fill the slots with cooling medium and injection molding material. In this way, the air slot groups 143 can be used to optimize the back electromotive force waveform of the motor, thereby reducing motor torque fluctuations and improving motor performance.

[0053] Furthermore, combined Figure 8As shown, the air slot assembly 143 includes a plurality of first air slots 1431, which are disposed on the edge of the rotor lamination 14; and / or, the air slot assembly 143 includes a second air slot 1432, which is located on the side of the magnet hole assembly 141 near the edge of the rotor lamination 14 and is aligned radially with the first magnetic bridge along the rotor lamination 14. The first air slot 1431 may be an arc-shaped notch structure disposed on the edge of the rotor lamination 14, and the second air slot 1432 may be a triangular through-hole structure, with rounded corners formed at the junction of adjacent slot walls of the second air slot 1432. This simplifies the structure of the first air slot 1431 and the second air slot 1432, facilitating manufacturing. Furthermore, the first air slot 1431 and the second air slot 1432 are both opened at the openings of the V-shaped first magnet hole group 1411 and the second magnet hole group 1412, and the first air slot 1431 is located on the edge of the rotor core 1. In this way, the air gap permeability can be changed by using the first air slot 1431 and / or the second air slot 1432, the magnetic field waveform can be optimized, and the electromagnetic force and torque fluctuation can be reduced.

[0054] An embodiment of the present invention provides an electric motor, which includes the rotor assembly described above.

[0055] The beneficial effects of the motor in this embodiment are the same as those of the rotor assembly described above, and will not be repeated here.

[0056] A vehicle according to an embodiment of the present invention includes a motor as described above.

[0057] The beneficial effects of the vehicle in this embodiment are the same as those of the motor described above, and will not be repeated here.

[0058] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that, Includes a rotor core (1), the rotor core (1) is provided with multiple magnetic steel slot groups (11) and multiple cooling oil channels (12), the multiple magnetic steel slot groups (11) and the multiple cooling oil channels (12) are evenly distributed along the circumference of the rotor core (1) and are set one to one; The magnet slot group (11) includes a first magnet slot group (111) and a second magnet slot group (112) arranged radially at intervals along the rotor core (1). The cooling oil channel (12) includes a first cooling oil channel (121) and a second cooling oil channel (122). The positions of the first cooling oil channel (121) and the second cooling oil channel (122) correspond to the first magnet slot group (111) and the second magnet slot group (112) in the corresponding magnet slot group (11). Cooling oil flows into the rotor core (1) through the first cooling oil channel (121) and the second cooling oil channel (122) respectively, so as to cool the rotor core (1) and the magnets (6) installed in the corresponding first magnet slot group (111) and the second magnet slot group (112) respectively.

2. The rotor assembly according to claim 1, characterized in that, The first magnet slot group (111) is located on the side of the second magnet slot group (112) near the inner surface of the rotor core (1), and the first magnet slot group (111) includes a first magnet slot (1111) and a second magnet slot (1112). The ends of the first magnet slot (1111) and the second magnet slot (1112) away from the inner surface of the rotor core (1) extend away from each other. The first cooling oil channel (121) is disposed between the ends of the first magnet slot (1111) and the second magnet slot (1112) of the corresponding first magnet slot group (111) near the inner surface of the rotor core (1), and the second cooling oil channel (122) is disposed between the first magnet slot group (111) and the second magnet slot group (112) of the corresponding magnet slot group (11).

3. The rotor assembly according to claim 1, characterized in that, It also includes an end plate assembly (2) coaxially arranged with the rotor core (1). The end faces of the rotor core (1) at both axial ends are respectively attached to the end plate assembly (2). The end plate assembly (2) is provided with multiple oil inlet grooves (21) and multiple oil outlet holes (22). The multiple oil inlet grooves (21) and multiple oil outlet holes (22) are respectively arranged in correspondence with multiple cooling oil channels (12). The first cooling oil channel (121) and the second cooling oil channel (122) both penetrate through the axial ends of the rotor core (1). At the end face, the oil inlet ends of the first cooling oil channel (121) and the second cooling oil channel (122) are respectively connected to the corresponding oil inlet groove (21), and the oil outlet ends of the first cooling oil channel (121) and the second cooling oil channel (122) are respectively connected to the corresponding oil outlet hole (22); after the cooling oil flows into the oil inlet groove (21), it flows into the rotor core (1) through the corresponding first cooling oil channel (121) and the second cooling oil channel (122) and flows out from the corresponding oil outlet hole (22).

4. The rotor assembly according to claim 3, characterized in that, The end plate assembly (2) includes a first end plate (24) and a second end plate (25) respectively disposed at both axial ends of the rotor core (1). The plurality of oil inlet grooves (21) include a first oil inlet groove (211) disposed on the first end plate (24) and a second oil inlet groove (212) disposed on the second end plate (25). The plurality of oil outlet holes (22) include a first oil outlet hole (221) disposed on the first end plate (24) and a second oil outlet hole (222) disposed on the second end plate (25). The first oil inlet groove (211) and the second oil inlet groove (212) are respectively positioned opposite to the second oil outlet hole (222) and the first oil outlet hole (221).

5. The rotor assembly according to claim 3, characterized in that, The oil outlet (22) is inclined relative to the axial direction of the rotor core (1), and the end of the oil outlet (22) away from the rotor core (1) is directed toward the stator winding.

6. The rotor assembly according to claim 3, characterized in that, The end plate assembly (2) is provided with a plurality of connecting slots (23). The plurality of connecting slots (23) are located on the side of the end plate assembly (2) facing the rotor core (1) and are respectively arranged in correspondence with the plurality of oil outlet holes (22). The connecting slots (23) are located on the side of the corresponding oil outlet hole (22) close to the central axis of the end plate assembly (2) and are connected to the corresponding oil outlet hole (22) radially along the rotor core (1). The oil outlet end of the first cooling oil channel (121) is directly opposite to and connected to the corresponding connecting slot (23). The oil outlet end of the second cooling oil channel (122) is directly opposite to the corresponding oil outlet hole (22).

7. The rotor assembly according to claim 4, characterized in that, It also includes a rotating shaft (3), which has a hollow cavity (31), a first oil passage (32) and a second oil passage (33) respectively connected to the hollow cavity (31), and the first oil passage (32) and the second oil passage (33) are respectively connected to the first oil inlet groove (211) and the second oil inlet groove (212); the cooling oil flowing into the hollow cavity (31) includes two flow paths, one of which flows into the corresponding cooling oil passage (12) through the first oil passage (32) and the first oil inlet groove (211) in sequence, and flows out from the corresponding second oil outlet hole (222), and the other of which flows into the corresponding cooling oil passage (12) through the second oil passage (33) and the second oil inlet groove (212) in sequence, and flows out from the corresponding first oil outlet hole (221).

8. The rotor assembly according to claim 7, characterized in that, It also includes an oil injection pipe (4) disposed in the hollow cavity (31). The pipe wall of the oil injection pipe (4) is provided with a first oil hole (41) and a second oil hole (42). The first oil hole (41) is disposed opposite to the first oil passage (32) and communicates with the hollow cavity (31). The second oil hole (42) is disposed opposite to the second oil passage (33) and communicates with the hollow cavity (31).

9. An electric motor, characterized in that, Includes the rotor assembly as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the motor as described in claim 9.

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