Rotor assembly and motor with same

Abstract

The utility model discloses a rotor assembly and a motor with the same, and relates to the technical field of motors. The rotor assembly comprises an iron core, a first end plate, a second end plate and a rotating shaft, the iron core is provided with a plurality of cooling flow channels, the first end plate and a first end face jointly define a first oil inlet flow channel and a first oil outlet flow channel, and the second end plate and a second end face jointly define a second oil inlet flow channel and a second oil outlet flow channel. According to the embodiment of the utility model, one path of cooling oil in the rotating shaft can flow into one part of the plurality of cooling flow channels through the first oil inlet flow channel and then flow out of the rotor assembly through the second oil outlet flow channel, and the other path of cooling oil in the rotating shaft flows into the other part of the plurality of cooling flow channels through the second oil inlet flow channel; the flow directions of the two paths of cooling oil in the corresponding cooling flow channels are opposite, so that sufficient and uniform cooling of the rotor assembly is achieved, the heat dissipation effect of the rotor assembly is improved, and the good performance of the rotor assembly is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor assembly and a motor with the rotor assembly. Background Art

[0002] With the increasing development of the new energy market, the market demand for motors is growing, and various types of motors, including asynchronous motors and permanent magnet motors, are used in hybrid vehicles or pure electric vehicles. In this context, the market has higher requirements for the power density and integration of motors, and the heat dissipation capacity of motors greatly affects the release of motor performance.

[0003] In the related art, the cooling effect of the oil-cooled motor on the rotor assembly is poor, resulting in large losses in the motor and affecting the motor performance. Utility Model Content

[0004] The utility model aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, the utility model provides a rotor assembly, which has a better heat dissipation effect.

[0005] The utility model also provides a motor with the rotor assembly.

[0006] According to the rotor assembly of the embodiment of the utility model, it includes: an iron core, wherein one axial end of the iron core has a first end face, and the other axial end of the iron core has a second end face, and the iron core is provided with a plurality of cooling channels between the first end face and the second end face; a first end plate, wherein the first end plate is in contact with the first end face, and the first end plate and the first end face jointly define a first oil inlet channel and a first oil outlet channel, a part of the plurality of cooling channels is connected to the first oil inlet channel, and another part of the plurality of cooling channels is connected to the first oil outlet channel, and the first end plate is provided with a first axial oil injection hole, and the first axial oil injection hole is connected to the first oil outlet channel a second end plate, the second end plate is fitted with the second end face, the second end plate and the second end face jointly define a second oil inlet channel and a second oil outlet channel, the cooling channel connected to the first oil inlet channel is also connected to the second oil outlet channel, the cooling channel connected to the first oil outlet channel is also connected to the second oil inlet channel, the second end plate is provided with a second axial oil spray hole, the second axial oil spray hole is connected to the second oil outlet channel; a rotating shaft, the rotating shaft is passed through the first end plate, the iron core and the second end plate, the rotating shaft is provided with an oil supply channel, and the oil supply channel is respectively connected to the first oil inlet channel and the second oil inlet channel.

[0007] According to the rotor assembly of the embodiment of the utility model, one path of cooling oil in the rotating shaft can flow into a part of the cooling channels among the multiple cooling channels through the first oil inlet channel, and then flow out of the rotor assembly through the second oil outlet channel. Another path of cooling oil in the rotating shaft can flow into another part of the cooling channels among the multiple cooling channels through the second oil inlet channel, and then flow out of the rotor assembly through the first oil outlet channel. The two paths of cooling oil have opposite flow directions in the corresponding cooling channels, so as to achieve sufficient and uniform cooling of the rotor assembly, enhance the heat dissipation effect of the rotor assembly, and enable the rotor assembly to maintain good performance.

[0008] According to some embodiments of the utility model, the iron core is further provided with a plurality of rotor slots between the first end face and the second end face, the first end plate is provided with a plurality of first avoidance slots, and the second end plate is provided with a plurality of second avoidance slots, and in the axial direction of the iron core, the plurality of rotor slots, the plurality of first avoidance slots and the plurality of second avoidance slots correspond one to one; the rotor assembly also includes a winding, and the winding is passed through each of the rotor slots.

[0009] According to some embodiments of the present invention, a plurality of the rotor slots are arranged at intervals along the circumferential direction of the core, and there is at least one cooling channel between any two adjacent rotor slots.

[0010] According to some embodiments of the utility model, the winding includes: a first end ring and a second end ring, the first end plate, the iron core and the second end plate are clamped between the first end ring and the second end ring; a plurality of guide bars, the plurality of guide bars correspond one-to-one to the plurality of rotor slots, each of the guide bars is passed through the corresponding rotor slot, and each of the guide bars is connected between the first end ring and the second end ring.

[0011] According to some embodiments of the present invention, the first end ring, the second end ring and the plurality of guide bars are integrally formed aluminum castings.

[0012] According to some embodiments of the utility model, the first end face is a plane, the first end plate has a first end plate face facing the first end face, the first end plate face has a first oil inlet groove and a first oil outlet groove, the first end face and the first oil inlet groove jointly define the first oil inlet flow channel, and the first end face and the first oil outlet groove jointly define the first oil outlet flow channel; the second end face is a plane, the second end plate has a second end plate face facing the second end face, the second end plate face has a second oil inlet groove and a second oil outlet groove, the second end face and the second oil inlet groove jointly define the second oil inlet flow channel, and the second end face and the second oil outlet groove jointly define the second oil outlet flow channel.

[0013] According to some embodiments of the utility model, the first end plate and the second end plate have the same structure, and in the axial direction of the iron core, the first oil inlet groove is opposite to the second oil outlet groove, and the first oil outlet groove is opposite to the second oil inlet groove.

[0014] According to some embodiments of the utility model, the first oil inlet groove includes: at least one first sub-oil inlet groove, the first sub-oil inlet groove includes: a first sub-groove segment, a second sub-groove segment and a plurality of third sub-groove segments, the first sub-groove segment and each of the third sub-groove segments extend in the radial direction of the first end plate, the second sub-groove segment extends in the circumferential direction of the first end plate, one end of the first sub-groove segment is connected to the oil supply channel, the other end of the first sub-groove segment is connected to each of the third sub-groove segments through the second sub-groove segment, and each of the third sub-groove segments is connected to a different cooling channel; the first oil outlet groove includes: at least one first sub-oil outlet groove, the first sub-oil outlet groove includes: a plurality of fourth sub-groove segments and a fifth sub-groove segments, each of the fourth sub-groove segments extends in the radial direction of the first end plate, the fifth sub-groove segment extends in the circumferential direction of the first end plate, each of the fourth sub-groove segments is connected to a different cooling channel, and each of the fourth sub-groove segments is connected to the first axial oil injection hole through the fifth sub-groove segment.

[0015] According to some embodiments of the present utility model, the first oil inlet groove includes: a plurality of the first sub-oil inlet grooves, and the first oil outlet groove includes: a plurality of the first sub-oil outlet grooves, and along the circumferential direction of the first end plate, the first sub-oil inlet grooves and the first sub-oil outlet grooves are alternately arranged.

[0016] The motor according to the embodiment of the utility model comprises the rotor assembly of the above embodiment.

[0017] According to the motor of the embodiment of the utility model, one path of cooling oil in the rotating shaft can flow into a part of the cooling channels among the multiple cooling channels through the first oil inlet channel, and then flow out of the rotor assembly through the second oil outlet channel. Another path of cooling oil in the rotating shaft can flow into another part of the cooling channels among the multiple cooling channels through the second oil inlet channel, and then flow out of the rotor assembly through the first oil outlet channel. The two paths of cooling oil have opposite flow directions in the corresponding cooling channels, so as to achieve sufficient and uniform cooling of the rotor assembly, enhance the heat dissipation effect of the rotor assembly, and enable the rotor assembly to maintain good performance.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross section of a rotor assembly according to an embodiment of the utility model Figure 1 ;

[0020] Figure 2 is a cross-section of a rotor assembly according to an embodiment of the present utility model Figure 2 ;

[0021] Figure 3 is a cross-section of a rotating shaft according to an embodiment of the present utility model Figure 1 ;

[0022] Figure 4 is a cross-section of a rotating shaft according to an embodiment of the present utility model Figure 2 ;

[0023] Figure 5 is a schematic diagram of the cooperation between an iron core and a first end plate according to an embodiment of the present utility model;

[0024] Figure 6 is a schematic diagram of the first end face of an iron core according to an embodiment of the present utility model;

[0025] Figure 7 is a front view of a first end plate according to an embodiment of the present utility model;

[0026] Figure 8 is a perspective view of a first end plate according to an embodiment of the present utility model;

[0027] Figure 9 is a front view of a second end plate according to an embodiment of the present utility model;

[0028] Figure 10 is a perspective view of a second end plate according to an embodiment of the present utility model;

[0029] Figure 11 is a schematic diagram of the flow path of cooling oil in a rotor assembly according to an embodiment of the present utility model;

[0030] Figure 12 is a schematic diagram of a winding according to an embodiment of the present utility model.

[0031] Reference numerals:

[0032] iron core 1; cooling flow channel 11; rotor slot 12; first end face 13;

[0033] first end plate 2; first oil inlet flow channel 21; first oil outlet flow channel 22; first axial oil injection hole 23; first avoidance groove 24; first end plate surface 25; first oil inlet groove 26; first sub-oil inlet groove 261; first sub-groove section 2611; second sub-groove section 2612; third sub-groove section 2613; first oil outlet groove 27; first sub-oil outlet groove 271; fourth sub-groove section 2711; fifth sub-groove section 2712;

[0034] Second end plate 3; Second oil inlet flow channel 31; Second oil outlet flow channel 32; Second axial oil injection hole 33; Second avoidance groove 34; Second end plate surface 35; Second oil inlet groove 36; Second sub-oil inlet groove 361; Sixth sub-groove section 3611; Seventh sub-groove section 3612; Eighth sub-groove section 3613; Second oil outlet groove 37; Second sub-oil outlet groove 371; Ninth sub-groove section 3711; Tenth sub-groove section 3712;

[0035] Rotating shaft 4; Oil supply flow channel 41; First communication hole 411; Second communication hole 412;

[0036] Winding 5; First end ring 51; Second end ring 52; Bar 53;

[0037] Rotor assembly 100. Detailed implementation manners

[0038] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "width", "upper", "lower", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or may communicate with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The following will combine with Figures 1 - 12 describe in detail the rotor assembly 100 according to an embodiment of the present invention and the motor having the same.

[0043] Refer to Figures 1 - 11 As shown, the rotor assembly 100 according to an embodiment of the present invention includes: a core 1, a first end plate 2, a second end plate 3, and a rotating shaft 4. One axial end of the core 1 has a first end face 13, and the other axial end of the core 1 has a second end face. The core 1 is provided with a plurality of cooling channels 11 between the first end face 13 and the second end face. The first end plate 2 is attached to the first end face 13, and the first end plate 2 and the first end face 13 jointly define a first oil inlet channel 21 and a first oil outlet channel 22. A part of the plurality of cooling channels 11 is communicated with the first oil inlet channel 21, and another part of the plurality of cooling channels 11 is communicated with the first oil outlet channel 22. The first end plate 2 is provided with a first axial oil injection hole 23, and the first axial oil injection hole 23 is communicated with the first oil outlet channel 22. The second end plate 3 is attached to the second end face, and the second end plate 3 and the second end face jointly define a second oil inlet channel 31 and a second oil outlet channel 32. The cooling channels 11 communicated with the first oil inlet channel 21 are also communicated with the second oil outlet channel 32, and the cooling channels 11 communicated with the first oil outlet channel 22 are also communicated with the second oil inlet channel 31. The second end plate 3 is provided with a second axial oil injection hole 33, and the second axial oil injection hole 33 is communicated with the second oil outlet channel 32. The rotating shaft 4 passes through the first end plate 2, the core 1, and the second end plate 3. The rotating shaft 4 is provided with an oil supply channel 41, and the oil supply channel 41 is respectively communicated with the first oil inlet channel 21 and the second oil inlet channel 31.

[0044] Among them, as Figures 1 - 4 shown, the rotating shaft 4 can pass through the first end plate 2, the core 1, and the second end plate 3. The rotating shaft 4 is provided with an oil supply channel 41. The oil supply channel 41 can extend along the axial direction of the rotating shaft 4, and the axis of the oil supply channel 41 can be collinear with the axis of the rotating shaft 4. Cooling oil can be input into the oil supply channel 41 from one side of the rotating shaft 4.

[0045] As Figure 5 shown, the core 1 has two opposite end faces in the axial direction. One end of the core 1 has a first end face 13, and the first end face 13 can be attached to the first end plate 2. The first end face 13 and the first end plate 2 can jointly define a first oil inlet channel 21 and a first oil outlet channel 22. The other end of the core 1 has a second end face, and the second end face can be attached to the second end plate 3. The second end face and the second end plate 3 can jointly define a second oil inlet channel 31 and a second oil outlet channel 32.

[0046] As Figure 5 、 Figure 6 and Figure 11As shown, the iron core 1 is provided with a plurality of cooling channels 11 between the first end face 13 and the second end face. The plurality of cooling channels 11 extend along the axial direction of the iron core 1. A part of the plurality of cooling channels 11 can communicate the first oil inlet channel 21 and the second oil outlet channel 32, and another part of the plurality of cooling channels 11 can communicate the second oil inlet channel 31 and the first oil outlet channel 22.

[0047] As Figure 7 and Figure 8 shown, the first end plate 2 is provided with a first axial oil injection hole 23. The first axial oil injection hole 23 communicates with the first oil outlet channel 22. The cooling oil can flow to the first axial oil injection hole 23 and spray out from the first axial oil injection hole 23 to discharge the cooling oil in the first oil outlet channel 22, so that new low-temperature cooling oil can continuously flow into the first oil outlet channel 22. The cooling oil sprayed out from the first axial oil injection hole 23 can also cool the components outside the first end plate 2. Similarly, as Figure 9 and Figure 10 shown, the second end plate 3 is provided with a second axial oil injection hole 33. The second axial oil injection hole 33 communicates with the second oil outlet channel 32. The cooling oil can flow from the second oil outlet channel 32 to the second axial oil injection hole 33 and spray out from the second axial oil injection hole 33 to discharge the cooling oil in the second oil outlet channel 32, so that new low-temperature cooling oil can continuously flow into the second oil outlet channel 32. The cooling oil sprayed out from the second axial oil injection hole 33 can also cool the components outside the second end plate 3.

[0048] As Figure 11 shown, Figure 11 the arrow direction in

[0049] is the flow path of the cooling oil in the rotor assembly 100. The cooling oil can first enter the oil supply channel 41 from one side of the rotating shaft 4, and then be divided into an a path and a b path. In the a path, the cooling oil sequentially flows through the first communication hole 411 of the oil supply channel 41, the first oil inlet channel 21, a part of the plurality of cooling channels 11, the second oil outlet channel 32, and then sprays out from the second axial oil injection hole 33. In the b path, the cooling oil sequentially flows through the second communication hole 412 of the oil supply channel 41, the second oil inlet channel 31, another part of the plurality of cooling channels 11, the first oil outlet channel 22, and then sprays out from the first axial oil injection hole 23. The cooling oil can exchange heat with the rotor assembly 100 to reduce the temperature of the rotor assembly 100, so as to realize the cooling of the rotor assembly 100, improve the heat dissipation effect of the rotor assembly 100, and maintain the good performance of the rotor assembly 100.

[0049] In the above embodiments, one path of the cooling oil in the rotating shaft 4 can flow into a part of the plurality of cooling channels 11 through the first oil inlet channel 21, and then flow out of the rotor assembly 100 through the second oil outlet channel 32. The other path of the cooling oil in the rotating shaft 4 flows into another part of the plurality of cooling channels 11 through the second oil inlet channel 31, and then flows out of the rotor assembly 100 through the first oil outlet channel 22. The flow directions of the two paths of cooling oil in the corresponding cooling channels 11 are opposite to each other, so as to achieve sufficient and uniform cooling of the rotor assembly 100, improve the heat dissipation effect of the rotor assembly 100, and enable the rotor assembly 100 to maintain good performance.

[0050] As some embodiments of the present invention, at least one of the first end face 13 and the first end plate 1 is provided with a groove structure, so as to jointly define the first oil inlet channel 21 and the first oil outlet channel 22 when the first end face 13 and the first end plate 1 are attached. Similarly, at least one of the second end face and the second end plate 2 is provided with a groove structure, so as to jointly define the second oil inlet channel 31 and the second oil outlet channel 32 when the second end face and the second end plate 2 are attached.

[0051] As some embodiments of the present invention, the rotor assembly 100 can be applied to an induction motor. Induction motors are widely used. The induction motor can use cast aluminum instead of the magnetic steel of the permanent magnet synchronous motor to reduce the manufacturing cost of the motor.

[0052] It should be noted that the rotor assembly 100 of the present invention is cooled by cooling oil. Compared with water cooling, there is no need to design a fan structure on the rotor assembly 100, and the cooling performance of the rotor assembly 100 of the present invention is better.

[0053] In some embodiments of the present invention, such as Figure 5 and Figure 6 shown, the iron core 1 is further provided with a plurality of rotor slots 12 between the first end face 13 and the second end face. The first end plate 2 is provided with a plurality of first avoidance slots 24, and the second end plate 3 is provided with a plurality of second avoidance slots 34. In the axial direction of the iron core 1, the plurality of rotor slots 12, the plurality of first avoidance slots 24 and the plurality of second avoidance slots 34 correspond to each other one by one. The rotor assembly 100 further includes a winding 5, and the winding 5 is disposed in each rotor slot 12.

[0054] Among them, the rotor slots 12 can extend through the iron core 1 along the axial direction of the iron core 1. The number of the rotor slots 12, the first avoidance slots 24 and the second avoidance slots 34 is multiple. The number of the rotor slots 12 can be, but is not limited to, 10, 20, 30, etc. The number of the first avoidance slots 24 can be, but is not limited to, 10, 20, 30, etc. The number of the second avoidance slots 34 can be, but is not limited to, 10, 20, 30, etc. The multiple rotor slots 12 can be arranged circumferentially along the iron core 1. The multiple first avoidance slots 24 can be arranged circumferentially along the first end plate 2. The multiple second avoidance slots 34 can be arranged circumferentially along the second end plate 3.

[0055] When the iron core 1 is assembled with the first end plate 2 and the second end plate 3, in the axial direction of the iron core 1, the first avoidance slots 24 and the second avoidance slots 34 correspond to the corresponding rotor slots 12. That is to say, in the axial direction of the iron core 1, the first end plate 2 avoids the rotor slots 12 through the first avoidance slots 24, and the second end plate 3 avoids the rotor slots 12 through the second avoidance slots 34, so as to avoid interference between the winding 5 and the first end plate 2 and the second end plate 3 when the winding 5 is inserted into the rotor slots 12.

[0056] As some embodiments of the present invention, when it is necessary to insert the winding 5 into the rotor slots 12, the first avoidance slots 24 and the second avoidance slots 34 can avoid the rotor slots 12. By providing the first avoidance slots 24 and the second avoidance slots 34, the probability of interference between the winding 5 and the first end plate 2 and the second end plate 3 when the winding 5 is inserted into the rotor slots 12 can be reduced.

[0057] As other embodiments of the present invention, when it is necessary to cast the winding 5 in the rotor slots 12, the first avoidance slots 24 and the second avoidance slots 34 can avoid the rotor slots 12, so that the casting material can enter and fill the rotor slots 12, and the position for the end ring is reserved.

[0058] In some embodiments of the present invention, as Figure 5 and Figure 6 shown, the multiple rotor slots 12 are arranged at intervals in the circumferential direction of the iron core 1, and there is at least one cooling channel 11 between any two adjacent rotor slots 12.

[0059] Among them, in the circumferential direction of the iron core 1, the multiple rotor slots 12 can be arranged at intervals, and there is at least one cooling channel 11 between any two adjacent rotor slots 12. The number of the cooling channels 11 between any two adjacent rotor slots 12 can be, but is not limited to, 1, 2, 3, etc., so that the cooling oil in the cooling channels 11 can cool the rotor slots 12 adjacent to the cooling channels 11, and further, the winding 5 in the rotor slots 12 can be fully cooled, the temperature of the iron core 1 and the winding 5 can be reduced, and the performance of the rotor assembly 100 can be maintained.

[0060] In some embodiments of the present utility model, as Figure 12 shown, the winding 5 includes: a first end ring 51, a second end ring 52, and a plurality of bars 53. The first end plate 2, the iron core 1, and the second end plate 3 are clamped between the first end ring 51 and the second end ring 52. The plurality of bars 53 correspond to the plurality of rotor slots 12 one by one. Each bar 53 is disposed through the corresponding rotor slot 12, and each bar 53 is connected between the first end ring 51 and the second end ring 52.

[0061] Among them, the first end plate 2, the iron core 1, and the second end plate 3 are clamped between the first end ring 51 and the second end ring 52. As Figure 1 and Figure 2 shown, the rotating shaft 4 can be sequentially disposed through the first end ring 51, the first end plate 2, the iron core 1, the second end plate 3, and the second end ring 52. Between the first end ring 51 and the second end ring 52, a plurality of bars 53 can be provided. The plurality of bars 53 correspond to the plurality of rotor slots 12 one by one. Each bar 53 is disposed through each rotor slot 12. The two ends of the bar 53 are respectively connected to the first end ring 51 and the second end ring 52, so that the first end ring 51, the second end ring 52, and the plurality of bars 53 are fixedly connected to the iron core 1, so as to reduce the shaking of the first end ring 51, the second end ring 52, and the plurality of bars 53, and further maintain the stability of the rotor assembly 100.

[0062] The cooling oil can be sprayed onto the first end ring 51 and the second end ring 52 through the first axial oil injection hole 23 of the first end plate 2 and the second axial oil injection hole 33 of the second end plate 3 to cool the first end ring 51 and the second end ring 52. Such a setting can further improve the cooling effect of the rotor assembly 100.

[0063] In some embodiments of the present utility model, as Figure 12 shown, the first end ring 51, the second end ring 52, and the plurality of bars 53 are integrally formed cast aluminum parts.

[0064] Among them, the first end ring 51, the second end ring 52, and the plurality of bars 53 can be constructed as integrally formed cast aluminum parts. By integrally forming the first end ring 51, the second end ring 52, and the plurality of bars 53, the stability of the connection between the first end ring 51, the second end ring 52, and the plurality of bars 53 can be enhanced, the probability of fracture at the connection of the first end ring 51, the second end ring 52, and the plurality of bars 53 can be reduced, and the rotor assembly 100 can have better stability.

[0065] As some embodiments of the present utility model, when manufacturing the cast aluminum part, the fixed iron core 1, the first end plate 2 and the second end plate 3 can be placed into the profiling casting mold for the aluminum casting process of the rotor assembly 100, and the mold is closed. A casting hole is provided at one end of the mold, and molten aluminum is injected from the casting hole. The molten aluminum can flow into the rotor slots 12. After heating and solidifying, cast aluminum bars 53 are formed in the rotor slots 12. Moreover, a first cast aluminum end ring 51 and a second cast aluminum end ring 52 are formed at both ends of the iron core 1, thereby completing the manufacturing of the cast aluminum winding 5.

[0066] In some other embodiments of the present utility model, the first end ring 51, the second end ring 52 and the plurality of bars 53 can be separate parts, and the first end ring 51, the second end ring 52 and the plurality of bars 53 can be connected into a whole by means of welding.

[0067] In some embodiments of the present utility model, as Figures 5 - 10 shown, the first end face 13 is a plane. The first end plate 2 has a first end plate surface 25 facing the first end face 13. The first end plate surface 25 has a first oil inlet groove 26 and a first oil outlet groove 27. The first end face 13 and the first oil inlet groove 26 jointly define a first oil inlet flow channel 21, and the first end face 13 and the first oil outlet groove 27 jointly define a first oil outlet flow channel 22. The second end face is a plane. The second end plate 3 has a second end plate surface 35 facing the second end face. The second end plate surface 35 has a second oil inlet groove 36 and a second oil outlet groove 37. The second end face and the second oil inlet groove 36 jointly define a second oil inlet flow channel 31, and the second end face and the second oil outlet groove 37 jointly define a second oil outlet flow channel 32.

[0068] Wherein, one side of the first end plate 2 facing the first end face 13 has a first end plate surface 25. The first end plate surface 25 can be configured with a first oil inlet groove 26 and a first oil outlet groove 27. Both the first oil inlet groove 26 and the first oil outlet groove 27 can be groove structures. When one axial end of the iron core 1 cooperates with the first end plate 2, the first end face 13 and the first oil inlet groove 26 jointly define a first oil inlet flow channel 21, and the first end face 13 and the first oil outlet groove 27 jointly define a first oil outlet flow channel 22, so that the cooling oil can flow through the first oil inlet flow channel 21 and the first oil outlet flow channel 22 to cool the rotor assembly 100.

[0069] Similarly, one side of the second end plate 3 facing the second end face has a second end plate surface 35. The second end plate surface 35 can be configured with a second oil inlet groove 36 and a second oil outlet groove 37. Both the second oil inlet groove 36 and the second oil outlet groove 37 can be groove structures. When the other axial end of the iron core 1 cooperates with the second end plate 3, the second end face and the second oil inlet groove 36 jointly define a second oil inlet flow channel 31, and the second end face and the second oil outlet groove 37 jointly define a second oil outlet flow channel 32, so that the cooling oil can flow through the second oil inlet flow channel 31 and the second oil outlet flow channel 32 to cool the rotor assembly 100.

[0070] In addition, when the first end plate surface 25 cooperates with the first end surface 13, the first end plate 2 can cover all the cooling channels 11, and the first avoidance groove 24 of the first end plate 2 can avoid the rotor groove 12. When it is necessary to cast the winding 5 (such as an aluminum-cast winding) on the iron core 1, the aluminum liquid can flow into each rotor groove 12 under the action of the first end plate 2, but will not flow into the cooling channels 11. The first end plate 2 can prevent the aluminum liquid from flowing into the cooling channels 11 and blocking the cooling channels 11, so as to improve the product qualification rate.

[0071] Similarly, when the second end plate surface 35 cooperates with the second end surface, the second end plate 3 can cover all the cooling channels 11, and the second avoidance groove 34 of the second end plate 3 can avoid the rotor groove 12. When it is necessary to cast the winding 5 (such as an aluminum-cast winding) on the iron core 1, the aluminum liquid can flow into each rotor groove 12 under the action of the second end plate 3, but will not flow into the cooling channels 11. The second end plate 3 can prevent the aluminum liquid from flowing into the cooling channels 11 and blocking the cooling channels 11, so as to improve the product qualification rate.

[0072] In some embodiments of the present utility model, as Figures 7 - 10 shown, the structures of the first end plate 2 and the second end plate 3 are the same. In the axial direction of the iron core 1, the first oil inlet groove 26 is aligned with the second oil outlet groove 37, and the first oil outlet groove 27 is aligned with the second oil inlet groove 36.

[0073] Among them, the structures of the first end plate 2 and the second end plate 3 can be the same, that is to say, the first end plate 2 and the second end plate 3 are parts of the same model. By making the structures of the first end plate 2 and the second end plate 3 the same, the design difficulty of the first end plate 2 and the second end plate 3 can be reduced, the difficulty of replacing or repairing the first end plate 2 and the second end plate 3 can be reduced, and the consistency of the rotor assembly 100 at the first end surface 13 and the second end surface can be improved.

[0074] In the axial direction of the iron core 1, the first oil inlet groove 26 is aligned with the second oil outlet groove 37, so that the cooling oil can easily flow from the first oil inlet groove 26 into the cooling channels 11 and be ejected from the second oil outlet groove 37 through the second axial oil injection hole 33. Such a setting can accelerate the flow of the cooling oil in the first oil inlet groove 26, the cooling channels 11 corresponding to the first oil inlet groove 26, the second oil outlet groove 37 and the second axial oil injection hole 33, so that the cooling oil can better cool the rotor assembly 100 to reduce the temperature of the rotor assembly 100.

[0075] Similarly, the second oil inlet groove 36 faces the first oil outlet groove 27, so that the cooling oil can conveniently flow from the second oil inlet groove 36 into the cooling flow path 11 and be ejected from the first oil outlet groove 27 through the first axial oil injection hole 23. Such a setting can accelerate the flow of the cooling oil in the second oil inlet groove 36, the cooling flow path 11 corresponding to the second oil inlet groove 36, the first oil outlet groove 27, and the first axial oil injection hole 23, so that the cooling oil can better cool the rotor assembly 100 to reduce the temperature of the rotor assembly 100.

[0076] In some embodiments of the present invention, as Figure 7 and Figure 8 shown, the first oil inlet groove 26 includes: at least one first sub-oil inlet groove 261, and the first sub-oil inlet groove 261 includes: a first sub-groove section 2611, a second sub-groove section 2612, and a plurality of third sub-groove sections 2613. The first sub-groove section 2611 and each third sub-groove section 2613 extend along the radial direction of the first end plate 2, the second sub-groove section 2612 extends along the circumferential direction of the first end plate 2, one end of the first sub-groove section 2611 is communicated with the oil supply channel 41, the other end of the first sub-groove section 2611 is communicated with each third sub-groove section 2613 through the second sub-groove section 2612, and each third sub-groove section 2613 is communicated with a different cooling flow path 11. The first oil outlet groove 27 includes: at least one first sub-oil outlet groove 271, and the first sub-oil outlet groove 271 includes: a plurality of fourth sub-groove sections 2711 and a fifth sub-groove section 2712. Each fourth sub-groove section 2711 extends along the radial direction of the first end plate 2, the fifth sub-groove section 2712 extends along the circumferential direction of the first end plate 2. Each fourth sub-groove section 2711 is communicated with a different cooling flow path 11, and each fourth sub-groove section 2711 is communicated with the first axial oil injection hole 23 through the fifth sub-groove section 2712.

[0077] Wherein, in the radial direction of the first end plate 2, the first sub-groove section 2611 can be arranged on the side of the second sub-groove section 2612 close to the axis of the first end plate 2, and the third sub-groove section 2613 can be arranged on the side of the second sub-groove section 2612 far from the axis of the first end plate 2. When the rotor assembly 100 rotates, the cooling oil can smoothly flow from the first sub-groove section 2611 to the second sub-groove section 2612 and from the second sub-groove section 2612 to the plurality of third sub-groove sections 2613 under the action of centrifugal force.

[0078] The oil supply channel 41 has a first communication hole 411. The first communication hole 411 faces and communicates with the first sub-groove segment 2611. The cooling oil in the oil supply channel 41 can enter the first sub-groove segment 2611 through the first communication hole 411, and then flow into the second sub-groove segment 2612 and multiple third sub-groove segments 2613 in sequence, and then enter multiple cooling channels 11 corresponding to and communicating with the multiple third sub-groove segments 2613 to cool the multiple cooling channels 11, and further cool the rotor assembly 100. Moreover, the cross-sectional width of the multiple third sub-groove segments 2613 can be adjusted to make the flow rate of the cooling oil flowing through the multiple third sub-groove segments 2613 balanced, so as to reduce the probability that the flow of the cooling oil in the iron core 1 affects the dynamic balance of the iron core 1, and improve the NVH (Noise, Vibration, Harshness) performance of the rotor assembly 100.

[0079] In the radial direction of the first end plate 2, the fourth sub-groove segment 2711 can be arranged on the side of the fifth sub-groove segment 2712 away from the axis of the first end plate 2, so as to stagger the first axial oil injection hole 23 communicating with the fourth sub-groove segment 2711 and the first end ring 51 in the radial direction of the rotor assembly 100, avoiding the first end ring 51 blocking the first axial oil injection hole 23. The cooling oil flowing out of the multiple cooling channels 11 corresponding to the multiple fourth sub-groove segments 2711 can flow into the corresponding multiple fourth sub-groove segments 2711. Under the action of the cooling oil pressure, the cooling oil flows from the multiple fourth sub-groove segments 2711 into the fifth sub-groove segment 2712, and then is sprayed out towards the first end ring 51 through the first axial oil injection hole 23, so that the relatively low-temperature cooling oil can flow into the rotor assembly 100 from the oil supply channel 41 of the rotating shaft to continuously cool the rotor assembly 100. Moreover, the cross-sectional width of the multiple fourth sub-groove segments 2711 can be adjusted to make the flow rate of the cooling oil flowing through the multiple fourth sub-groove segments 2711 balanced, and multiple first axial oil injection holes 23 can be provided to make the oil injection of the first axial oil injection holes 23 uniform, so as to reduce the probability that the flow of the cooling oil in the iron core 1 affects the dynamic balance of the iron core 1, and improve the NVH (Noise, Vibration, Harshness) performance of the rotor assembly 100.

[0080] Similarly, as Figure 9 and Figure 10As shown, the second oil inlet groove 36 includes: at least one second sub-oil inlet groove 361. The second sub-oil inlet groove 361 includes: a sixth sub-groove section 3611, a seventh sub-groove section 3612, and a plurality of eighth sub-groove sections 3613. The sixth sub-groove section 3611 and each eighth sub-groove section 3613 extend along the radial direction of the second end plate 3, the seventh sub-groove section 3612 extends along the circumferential direction of the second end plate 3. One end of the sixth sub-groove section 3611 is communicated with the oil supply channel 41, the other end of the sixth sub-groove section 3611 is communicated with each eighth sub-groove section 3613 through the seventh sub-groove section 3612, and each eighth sub-groove section 3613 is communicated with a different cooling channel 11. The second oil outlet groove 37 includes: at least one second sub-oil outlet groove 371. The second sub-oil outlet groove 371 includes: a plurality of ninth sub-groove sections 3711 and a tenth sub-groove section 3712. Each ninth sub-groove section 3711 extends along the radial direction of the second end plate 3, the tenth sub-groove section 3712 extends along the circumferential direction of the second end plate 3. Each ninth sub-groove section 3711 is communicated with a different cooling channel 11, and each ninth sub-groove section 3711 is communicated with the second axial oil injection hole 33 through the tenth sub-groove section 3712.

[0081] Wherein, in the radial direction of the second end plate 3, the sixth sub-groove section 3611 can be arranged on the side of the seventh sub-groove section 3612 close to the axis of the second end plate 3, and the eighth sub-groove section 3613 can be arranged on the side of the seventh sub-groove section 3612 away from the axis of the second end plate 3. When the rotor assembly 100 rotates, the cooling oil can smoothly flow from the sixth sub-groove section 3611 to the seventh sub-groove section 3612, and from the seventh sub-groove section 3612 to the plurality of eighth sub-groove sections 3613 under the action of centrifugal force.

[0082] The oil supply channel 41 has a second communication hole 412, the second communication hole 412 is opposite to and communicated with the sixth sub-groove section 3611. The cooling oil in the oil supply channel 41 can enter the sixth sub-groove section 3611 through the second communication hole 412, and then flow into the seventh sub-groove section 3612 and the plurality of eighth sub-groove sections 3613 in sequence, and then enter the plurality of cooling channels 11 corresponding to and communicated with the plurality of eighth sub-groove sections 3613 to cool the plurality of cooling channels 11, and further can cool the rotor assembly 100. And, the cross-sectional width of the plurality of eighth sub-groove sections 3613 can be adjusted, so that the flow rate of the cooling oil flowing through the plurality of eighth sub-groove sections 3613 is balanced, to reduce the probability that the flow of the cooling oil in the iron core 1 affects the dynamic balance of the iron core 1, and can improve the NVH (Noise, Vibration, Harshness) performance of the rotor assembly 100.

[0083] In the radial direction of the second end plate 3, the ninth sub-slot section 3711 can be arranged on the side of the tenth sub-slot section 3712 away from the axis of the second end plate 3, so as to stagger the second axial oil injection hole 33 communicating with the ninth sub-slot section 3711 and the second end ring 52 in the radial direction of the rotor assembly 100, avoiding the second end ring 52 from blocking the first axial oil injection hole 23. The cooling oil flowing out of the plurality of cooling channels 11 corresponding to the plurality of ninth sub-slot sections 3711 can flow into the corresponding plurality of ninth sub-slot sections 3711. Under the action of the cooling oil pressure, the cooling oil flows from the plurality of ninth sub-slot sections 3711 into the tenth sub-slot section 3712, and then is sprayed out towards the second end ring 52 through the second axial oil injection hole 33, so that the relatively low-temperature cooling oil can flow into the rotor assembly 100 from the oil supply channel 41 of the rotating shaft, so as to continuously cool the rotor assembly 100. And, the cross-sectional width of the plurality of ninth sub-slot sections 3711 can be adjusted to make the flow rate of the cooling oil flowing through the plurality of ninth sub-slot sections 3711 balanced, and the second axial oil injection holes 33 can be provided in plurality to make the oil injection of the second axial oil injection holes 33 uniform, so as to reduce the probability that the flow of the cooling oil in the iron core 1 affects the dynamic balance of the iron core 1, and the NVH (Noise, Vibration, Harshness) performance of the rotor assembly 100 can be improved.

[0084] As some embodiments of the present utility model, the flow channels that can be shunted make the flow rates of the cooling oil entering the plurality of cooling channels 11 of the iron core 1 at the same time balanced. The first shunt: after the oil supply channel 41 supplies oil, it is respectively shunted into the first sub-slot section 2611 and the sixth sub-slot section 3611 through the first communication hole 411 and the second communication hole 412, and the sizes of the oil holes of the first communication hole 411 and the second communication hole 412 are adjusted to make the flow rate balanced before entering the end plate; the second shunt: when the cooling oil enters the seventh sub-slot section 3612 through the sixth sub-slot section 3611, and enters the second sub-slot section 2612 through the first sub-slot section 2611, the sizes of the oil channels of the sixth sub-slot section 3611 and the first sub-slot section 2611 are adjusted to make the flow rate of the cooling oil entering the seventh sub-slot section 3612 and the second sub-slot section 2612 balanced; the third shunt: when the cooling oil enters the eighth sub-slot section 3613 through the seventh sub-slot section 3612, and enters the third sub-slot section 2613 through the second sub-slot section 2612, the sizes of each third sub-slot section 2613 and each eighth sub-slot section 3613 are adjusted to make the flow rate of the cooling oil entering the plurality of cooling channels 11 of the iron core 1 balanced. After the first, second, and third shunts, the coolant is balanced in the plurality of cooling channels 11, so as not to affect the dynamic balance of the rotor assembly 100, that is, the heat dissipation is optimized and the NVH (Noise, Vibration, Harshness) performance is ensured.

[0085] In some embodiments of the present utility model, such asFigure 7 and Figure 8 As shown in Figure 8 , the first oil inlet groove 26 includes a plurality of first sub-oil inlet grooves 261, and the first oil outlet groove 27 includes a plurality of first sub-oil outlet grooves 271. Along the circumferential direction of the first end plate 2, the first sub-oil inlet grooves 261 and the first sub-oil outlet grooves 271 are alternately arranged.

[0086] Among them, the first oil outlet groove 27 includes a plurality of first sub-oil outlet grooves 271. The number of the first sub-oil inlet grooves 261 can be 2, 3, 4, etc. By setting a plurality of first sub-oil inlet grooves 261, the size of the first sub-oil inlet groove 261 in the circumferential direction of the first end plate 2 can be reduced, the size of the second sub-groove section 2612 in the circumferential direction of the first end plate 2 can be reduced, the flow distance of the cooling oil on the second sub-groove section 2612 can be reduced, the cooling oil can flow from the oil supply channel 41 through the first sub-oil inlet groove 261 into the corresponding cooling channel 11 more quickly, the oil cooling performance of the rotor assembly 100 can be enhanced, and the temperature of the rotor assembly 100 can be better reduced.

[0087] Along the circumferential direction of the first end plate 2, the first sub-oil inlet grooves 261 and the first sub-oil outlet grooves 271 are alternately arranged. That is to say, a first sub-oil outlet groove 271 is arranged between every two adjacent first sub-oil inlet grooves 261, and a first sub-oil inlet groove 261 is arranged between every two adjacent first sub-oil outlet grooves 271. The temperature of the cooling oil at the first sub-oil inlet groove 261 is lower than the temperature of the cooling oil at the first sub-oil outlet groove 271. By alternately arranging the first sub-oil inlet grooves 261 and the first sub-oil outlet grooves 271, the cooling oil can cool the rotor assembly 100 more evenly, the probability of local overheating of the rotor assembly 100 can be reduced, and the rotor assembly 100 can have better performance.

[0088] In some embodiments of the present invention, as Figure 9 and Figure 10 shown, the second oil inlet groove 36 includes a plurality of second sub-oil inlet grooves 361, and the second oil outlet groove 37 includes a plurality of second sub-oil outlet grooves 371. Along the circumferential direction of the second end plate 3, the second sub-oil inlet grooves 361 and the second sub-oil outlet grooves 371 are alternately arranged.

[0089] Among them, the second oil outlet groove 37 includes a plurality of second sub-oil outlet grooves 371. The number of the second sub-oil inlet grooves 361 can be 2, 3, 4, etc. By setting a plurality of second sub-oil inlet grooves 361, the size of the second sub-oil inlet groove 361 in the circumferential direction of the second end plate 3 can be reduced, the size of the seventh sub-groove section 3612 in the circumferential direction of the second end plate 3 can be reduced, the flow distance of the cooling oil on the seventh sub-groove section 3612 can be reduced, the cooling oil can flow from the oil supply channel 41 through the second sub-oil inlet groove 361 into the corresponding cooling channel 11 more quickly, the oil cooling performance of the rotor assembly 100 can be enhanced, and the temperature of the rotor assembly 100 can be better reduced.

[0090] In the circumferential direction of the second end plate 3, the second sub-inlet oil grooves 361 and the second sub-outlet oil grooves 371 are arranged alternately. That is to say, one second sub-outlet oil groove 371 is provided between every two adjacent second sub-inlet oil grooves 361, and one second sub-inlet oil groove 361 is provided between every two adjacent second sub-outlet oil grooves 371. The temperature of the cooling oil at the second sub-inlet oil groove 361 is lower than the temperature of the cooling oil at the second sub-outlet oil groove 371. By arranging the second sub-inlet oil grooves 361 and the second sub-outlet oil grooves 371 alternately, the cooling oil can cool the rotor assembly 100 more evenly, so as to reduce the probability of local overheating of the rotor assembly 100 and enable the rotor assembly 100 to have better performance.

[0091] The motor according to the embodiment of the present invention includes the rotor assembly 100 of the above embodiment. One path of the cooling oil in the rotating shaft 4 can flow into a part of the plurality of cooling channels 11 through the first oil inlet channel 21, and then flow out of the rotor assembly 100 through the second oil outlet channel 32. The other path of the cooling oil in the rotating shaft 4 flows into another part of the plurality of cooling channels 11 through the second oil inlet channel 31, and then flows out of the rotor assembly 100 through the first oil outlet channel 22. The flow directions of the two paths of cooling oil in the corresponding cooling channels 11 are opposite, so as to achieve sufficient and uniform cooling of the rotor assembly 100, improve the heat dissipation effect of the rotor assembly 100, and enable the rotor assembly 100 to maintain good performance.

[0092] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0093] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A rotor assembly, characterized in that: include: An iron core (1), wherein one axial end of the iron core (1) has a first end surface (13), the other axial end of the iron core (1) has a second end surface, and the iron core (1) is provided with a plurality of cooling channels (11) between the first end surface (13) and the second end surface; A first end plate (2), wherein the first end plate (2) is fitted with the first end surface (13), the first end plate (2) and the first end surface (13) jointly define a first oil inlet channel (21) and a first oil outlet channel (22), a portion of the plurality of cooling channels (11) is connected to the first oil inlet channel (21), another portion of the plurality of cooling channels (11) is connected to the first oil outlet channel (22), and the first end plate (2) is provided with a first axial oil injection hole (23), and the first axial oil injection hole (23) is connected to the first oil outlet channel (22); a second end plate (3), wherein the second end plate (3) is fitted with the second end surface, the second end plate (3) and the second end surface jointly define a second oil inlet channel (31) and a second oil outlet channel (32), the cooling channel (11) connected to the first oil inlet channel (21) is also connected to the second oil outlet channel (32), the cooling channel (11) connected to the first oil outlet channel (22) is also connected to the second oil inlet channel (31), the second end plate (3) is provided with a second axial oil injection hole (33), and the second axial oil injection hole (33) is connected to the second oil outlet channel (32); A rotating shaft (4), the rotating shaft (4) is passed through the first end plate (2), the iron core (1) and the second end plate (3), the rotating shaft (4) is provided with an oil supply passage (41), and the oil supply passage (41) is respectively connected to the first oil inlet passage (21) and the second oil inlet passage (31).

2. The rotor assembly according to claim 1, characterized in that: The iron core (1) is further provided with a plurality of rotor slots (12) between the first end face (13) and the second end face, the first end plate (2) is provided with a plurality of first avoidance slots (24), and the second end plate (3) is provided with a plurality of second avoidance slots (34), and in the axial direction of the iron core (1), the plurality of rotor slots (12), the plurality of first avoidance slots (24) and the plurality of second avoidance slots (34) correspond one to one; The rotor assembly further comprises a winding (5), wherein the winding (5) is passed through each of the rotor slots (12).

3. The rotor assembly according to claim 2, characterized in that: The plurality of rotor slots (12) are arranged at intervals along the circumferential direction of the iron core (1), and at least one cooling channel (11) is provided between any two adjacent rotor slots (12).

4. The rotor assembly according to claim 2, characterized in that: The winding (5) comprises: A first end ring (51) and a second end ring (52), wherein the first end plate (2), the iron core (1) and the second end plate (3) are sandwiched between the first end ring (51) and the second end ring (52); A plurality of guide bars (53), the plurality of guide bars (53) corresponding one to the plurality of rotor slots (12), each of the guide bars (53) passing through the corresponding rotor slot (12), and each of the guide bars (53) connected between the first end ring (51) and the second end ring (52).

5. The rotor assembly according to claim 4, characterized in that: The first end ring (51), the second end ring (52) and the plurality of guide bars (53) are integrally formed aluminum castings.

6. The rotor assembly according to any one of claims 1 to 5, characterized in that: The first end surface (13) is a plane, the first end plate (2) has a first end plate surface (25) facing the first end surface (13), the first end plate surface (25) has a first oil inlet groove (26) and a first oil outlet groove (27), the first end surface (13) and the first oil inlet groove (26) jointly define the first oil inlet flow channel (21), and the first end surface (13) and the first oil outlet groove (27) jointly define the first oil outlet flow channel (22); The second end surface is a plane, the second end plate (3) has a second end plate surface (35) facing the second end surface, the second end plate surface (35) has a second oil inlet groove (36) and a second oil outlet groove (37), the second end surface and the second oil inlet groove (36) jointly define the second oil inlet flow channel (31), and the second end surface and the second oil outlet groove (37) jointly define the second oil outlet flow channel (32).

7. The rotor assembly according to claim 6, characterized in that The first end plate (2) and the second end plate (3) have the same structure. In the axial direction of the iron core (1), the first oil inlet groove (26) is directly opposite to the second oil outlet groove (37), and the first oil outlet groove (27) is directly opposite to the second oil inlet groove (36).

8. The rotor assembly according to claim 7, characterized in that The first oil inlet groove (26) comprises: at least one first sub-oil inlet groove (261), the first sub-oil inlet groove (261) comprising: a first sub-groove segment (2611), a second sub-groove segment (2612) and a plurality of third sub-groove segments (2613), the first sub-groove segment (2611) and each of the third sub-groove segments (2613) both extending in the radial direction of the first end plate (2), the second sub-groove segment (2612) extending in the circumferential direction of the first end plate (2), one end of the first sub-groove segment (2611) communicating with the oil supply passage (41), the other end of the first sub-groove segment (2611) communicating with each of the third sub-groove segments (2613) through the second sub-groove segment (2612), and each of the third sub-groove segments (2613) communicating with a different cooling channel (11); The first oil outlet groove (27) comprises: at least one first sub-oil outlet groove (271), the first sub-oil outlet groove (271) comprises: a plurality of fourth sub-groove segments (2711) and a fifth sub-groove segment (2712), each of the fourth sub-groove segments (2711) extends along the radial direction of the first end plate (2), the fifth sub-groove segment (2712) extends along the circumferential direction of the first end plate (2), each of the fourth sub-groove segments (2711) is connected to a different cooling channel (11), and each of the fourth sub-groove segments (2711) is connected to the first axial oil injection hole (23) through the fifth sub-groove segment (2712).

9. The rotor assembly according to claim 8, characterized in that The first oil inlet groove (26) comprises: a plurality of the first sub-oil inlet grooves (261); the first oil outlet groove (27) comprises: a plurality of the first sub-oil outlet grooves (271); along the circumferential direction of the first end plate (2), the first sub-oil inlet grooves (261) and the first sub-oil outlet grooves (271) are arranged alternately.

10. A motor, characterized in that: Comprising a rotor assembly according to any one of claims 1-9.

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