Motor rotor, motor and vehicle

Abstract

The utility model discloses a motor rotor, a motor and a vehicle. The motor rotor comprises a rotating shaft, a first rotor core group and a second rotor core group. A plurality of first oil channels are formed in the first rotor core group, extend in the axial direction of the rotating shaft and penetrate through two end surfaces of the first rotor core group; a first channel is arranged in the second rotor core group, and the first channel penetrates through two end surfaces of the second rotor core group; wherein an annular gap is formed between the peripheral wall of the rotating shaft and the inner wall of the first channel, the annular gap extends in the axial direction of the rotating shaft, the multiple first oil channels are distributed in the circumferential direction of the annular gap, and at least part of the projection, in the axial direction of the rotating shaft, of each first oil channel is located in the annular gap; and therefore, each first oil duct is communicated with the annular gap. The motor rotor, the motor and the vehicle provided by the utility model are relatively simple to assemble, and can facilitate the arrangement of a heat dissipation structure.

Description

Technical Field

[0001] This utility model relates to electric motors, and more particularly to an electric motor rotor, an electric motor, and a vehicle. Background Technology

[0002] An electric motor consists of a stator and a rotor. When the motor is running, the rotor rotates relative to the stator. Because the rotor generates a lot of heat during its continuous rotation, which is difficult to dissipate in time, the motor is prone to overheating, which can affect its lifespan and stability. Therefore, rotor cooling is necessary.

[0003] One disclosed technical solution includes a motor shaft and a rotor core sleeved on the motor shaft. The motor shaft has an oil passage for communicating with the cooling system, and the rotor core also has an oil passage. The oil passage of the rotor core is connected to the oil passage of the motor shaft. However, due to the structure of its oil passage, assembly is relatively difficult. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a motor rotor that is relatively simple to assemble.

[0005] This utility model also proposes a motor having the above-mentioned motor rotor.

[0006] This utility model also proposes a vehicle having the above-mentioned motor.

[0007] According to a first aspect of the present invention, a motor rotor includes a rotating shaft, a first rotor core assembly and a second rotor core assembly, wherein the first rotor core assembly and the second rotor core assembly are both sleeved on the rotating shaft, and the first rotor core assembly and the second rotor core assembly are both stacked along the axial direction of the rotating shaft.

[0008] The first rotor core assembly is provided with a plurality of first oil passages, which extend along the axial direction of the shaft and penetrate through the two end faces of the first rotor core assembly.

[0009] The second rotor core assembly has a first channel that passes through both end faces of the second rotor core assembly, and the rotating shaft is disposed within the first channel;

[0010] There is an annular gap between the outer peripheral wall of the rotating shaft and the inner wall of the first channel. The annular gap extends along the axial direction of the rotating shaft. A plurality of first oil passages are distributed circumferentially along the annular gap, and at least part of the projection of each first oil passage along the axial direction of the rotating shaft is within the annular gap, so that each first oil passage is connected to the annular gap.

[0011] The motor rotor according to the embodiment of this utility model has at least the following beneficial effects: An annular gap exists between the outer peripheral wall of the shaft and the inner wall of the first channel. Oil flows from the shaft into the annular gap, passes through the first oil passage, and then flows out. Multiple first oil passages are distributed circumferentially along the annular gap, and at least a portion of the axial projection of each first oil passage lies within the annular gap. This ensures that changes in the circumferential position of the second rotor core assembly do not affect the communication between each first oil passage and the annular gap. Therefore, during assembly, it is not necessary to align the second rotor core assembly and the first rotor core assembly in the circumferential direction, reducing installation difficulty. Furthermore, the arrangement of the first oil passages is not constrained by the circumferential position of the second rotor core assembly, thus making the design of the aforementioned first oil passages more convenient.

[0012] According to some embodiments of the present invention, the cross-section of the first channel is circular, and along the radial direction of the first channel, the minimum distance between each of the first oil passages and the central axis of the first channel is equal, and the minimum distance is less than the radius of the first channel.

[0013] According to some embodiments of the present invention, each of the first oil passages is equally spaced along the circumference of the annular gap.

[0014] According to some embodiments of the present invention, along the radial direction of the first channel, the maximum distance between each of the first oil passages and the central axis of the first channel is equal, and the maximum distance is greater than or equal to the radius of the first channel.

[0015] According to some embodiments of the present invention, the cross-sectional shape of the first oil passage is circular, polygonal, or arc-shaped.

[0016] According to some embodiments of the present invention, the motor rotor includes a squirrel cage, the squirrel cage includes guide bars and end rings connected to both ends of the guide bars, the end rings abut against the end of the first rotor core group away from the second rotor core group, wherein, along the radial direction of the rotating shaft, the projection of the end rings along the axial direction of the rotating shaft is located outside the first oil passage.

[0017] According to some embodiments of the present invention, the first rotor core group is provided in multiple groups, each first rotor core group includes multiple first rotor plates stacked along the axial direction, and the second rotor core group is sandwiched between two of the second rotor core groups, the second rotor core group including at least one second rotor plate.

[0018] According to some embodiments of the present invention, the rotating shaft has a rotating shaft oil passage, the rotating shaft oil passage includes a first branch extending axially and a second branch extending radially, the second branch communicating between the first branch and the annular gap.

[0019] The motor according to a second aspect of the present invention includes the motor rotor described in the above embodiments.

[0020] The vehicle according to a third aspect of the present invention includes the motor described in the above embodiments.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a cross-sectional schematic diagram of the motor rotor according to an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the first structure of the first rotor core assembly of the motor rotor according to an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the second rotor core assembly of the motor rotor according to an embodiment of the present invention;

[0026] Figure 4 This is a cross-sectional schematic diagram of the motor rotor according to an embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the second structure of the first rotor core assembly of the motor rotor according to an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the third structure of the first rotor core assembly of the motor rotor according to an embodiment of the present utility model;

[0029] Figure 7 This is a schematic diagram of the structure of the squirrel cage of the motor rotor according to an embodiment of the present invention.

[0030] Figure label:

[0031] 100, pivot; 100a, lane 1; 100b, lane 2;

[0032] 200, First rotor core assembly; 200a, First oil passage;

[0033] 300, Second rotor core assembly; 300a, First channel; 300b, Annular gap;

[0034] 410. Guide bar; 420. End ring. Detailed Implementation

[0035] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0037] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc., are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0040] In the description of the embodiments of this application, the technical terms "top", "bottom", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0042] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0043] In related technologies, an electric motor includes a motor shaft and a rotor core sleeved on the motor shaft. The motor shaft has oil passages for communicating with a cooling system, and the rotor core also has oil passages. The rotor core includes two sets, one set having N axially extending first oil passages and the other set having M axially extending second oil passages. During assembly, each first oil passage needs to be axially aligned with its corresponding second oil passage to connect with it. This results in the two sets of rotor cores having relatively fixed circumferential positions. The aforementioned circumferential position requirements make assembly difficult. Furthermore, since the first oil passages are constrained in the circumferential position by the second oil passages, the first oil passages cannot be freely positioned in the circumferential direction, affecting the heat dissipation effect.

[0044] Please refer to the following for details. Figures 1-7 The present application provides a motor rotor, including a rotating shaft 100, a first rotor core assembly 200 and a second rotor core assembly 300.

[0045] Please refer to Figure 1 The first rotor core assembly 200 and the second rotor core assembly 300 are both sleeved on the rotating shaft 100, and the first rotor core assembly 200 and the second rotor core assembly 300 are stacked along the axial direction of the rotating shaft 100. The first rotor core assembly 200 can be mounted on the rotating shaft 100 by a key, interference fit, or other fixed installation method. The rotation of the rotating shaft 100, the first rotor core assembly 200, and the second rotor core assembly 300 transmits the mechanical energy of the motor to the external load.

[0046] Please refer to Figure 1 and Figure 2The first rotor core assembly 200 is provided with a plurality of first oil passages 200a, which extend axially along the shaft 100 and penetrate both end faces of the first rotor core assembly 200. The angle between the extension path of the first oil passage 200a and the axial direction of the shaft 100 is within a reasonable deviation range allowed by the machining and assembly processes. Oil can flow into the first oil passage 200a from one end of the first rotor core assembly 200 and flow out from the other end to absorb heat from the first rotor core assembly 200 and reduce its temperature.

[0047] Please refer to Figure 1 and Figure 3 The second rotor core assembly 300 has a first channel 300a, which penetrates both end faces of the second rotor core assembly 300. The rotating shaft 100 is disposed within the first channel 300a and is coaxially arranged with the first channel 300a. Figure 3 The circular area enclosed by the dashed line corresponds to the area where the rotating shaft is set. The two ends of the rotating shaft 100 extend out of the first channel 300a. The rotating shaft 100 is provided with a rotating shaft oil passage for allowing external oil to flow into the rotating shaft 100.

[0048] The diameter of the first channel 300a is larger than the diameter of the rotating shaft 100, resulting in an annular gap 300b between the outer peripheral wall of the rotating shaft 100 and the inner wall of the first channel 300a. The annular gap 300b extends axially along the rotating shaft 100, and the angle between the extension path of the annular gap 300b and the axial direction of the rotating shaft 100 is within a reasonable deviation range allowed by machining and assembly processes. The annular gap 300b is a continuous annular gap 300b circumferentially. Multiple first oil passages 200a are distributed circumferentially along the annular gap 300b, and at least a portion of the axial projection of each first oil passage 200a lies within the annular gap 300b, thus ensuring communication between each first oil passage 200a and the annular gap 300b.

[0049] In the above embodiment, an annular gap 300b exists between the outer peripheral wall of the rotating shaft 100 and the inner wall of the first channel 300a. Oil flows from the rotating shaft 100 into the annular gap 300b and flows out after passing through the first oil passage 200a. Multiple first oil passages 200a are distributed circumferentially along the annular gap 300b, and at least a portion of the projection of each first oil passage 200a along the axial direction of the rotating shaft lies within the annular gap 300b. This ensures that changes in the circumferential position of the second rotor core assembly 300 do not affect the communication between each first oil passage 200a and the annular gap 300b. Therefore, the second rotor core assembly 300 and the first rotor core assembly 200 do not need to be aligned circumferentially during assembly, reducing installation difficulty. Furthermore, the arrangement of the first oil passages 200a is not constrained by the circumferential position of the second rotor core assembly 300, making the design of the first oil passages 200a more convenient.

[0050] In some embodiments, please refer to Figure 4 The cross-section of the first channel 300a is circular, making the outer annular surface of the annular gap 300b circular. The cross-section of the rotating shaft 100 is also circular, making the inner annular surface of the annular gap 300b also circular.

[0051] Along the radial direction of the first channel 300a, the minimum distance between each first oil passage 200a and the central axis of each first channel 300a is equal. Specifically, the minimum distance between each first oil passage 200a and the central axis of the first channel 300a is the distance h between the position closest to the central axis on the inner wall of the first oil passage 200a along the radial direction of the first channel 300a and the central axis. This minimum distance is less than the radius of the first channel 300a, ensuring that each first oil passage 200a is connected to the annular gap 300b. During assembly, the circumferential position of the first rotor core assembly 200 relative to the second rotor core assembly 300 changes, but the radial position of each first oil passage 200a and the annular gap 300b remains unchanged, thus maintaining the connection between the first oil passage 200a and the annular gap 300b.

[0052] It is understood that the circumferential spacing of each first oil passage 200a is not limited. For some embodiments, please refer to... Figure 2 Each of the first oil passages 200a is arranged at equal intervals along the circumference, thus enabling more uniform heat dissipation for the second rotor core assembly 300 and preventing excessively high local temperatures. In other embodiments, some of the first oil passages 200a can be arranged relatively concentrated in areas with severe heat generation, depending on the heat generation situation.

[0053] To avoid oil trapping at the connection between the annular gap 300b and the first oil passage 200a, some embodiments are described below. Figure 4 Along the radial direction of the first channel 300a, the maximum distance between each first oil passage 200a and the central axis of the first channel 300a is equal. The maximum distance between each first oil passage 200a and the central axis of the first channel 300a is the distance between the position furthest from the central axis on the inner wall of the first oil passage 200a along the radial direction of the first channel 300a and the central axis.

[0054] When the maximum distance is greater than the radius of the first channel 300a, the projection of a portion of each first oil passage 200a along the axial direction of the rotating shaft 100 is within the annular gap 300b, and the projection of the remaining portion along the axial direction of the rotating shaft 100 is outside the first channel 300a. When the maximum distance is equal to the radius of the first channel 300a, the projection of each first oil passage 200a along the axial direction of the rotating shaft 100 is within the annular gap 300b, and a portion of the inner wall of each first oil passage 200a is axially aligned with the inner wall of the first channel 300a. Figure 4(An example is shown in the image). In this way, when the oil flows from the annular gap 300b to the first oil passage 200a, a dead zone will not be formed on the side of the annular gap 300b away from the rotating shaft 100, thus ensuring the heat dissipation effect.

[0055] In some embodiments, please refer to Figure 1 The first oil passage 200a extends in a straight line along the axial direction to help reduce the resistance encountered by the oil when flowing in the first oil passage 200a.

[0056] In some embodiments, please refer to Figure 2 , Figure 5 and Figure 6 The cross-section of the first channel 300a is one of a circular hole, a polygonal hole, or an arc hole.

[0057] Specifically, the polygonal hole can be a square hole or a triangular hole. When the cross-section of the first channel 300a is a triangular hole, one corner of the triangle faces the central axis of the rotating shaft 100, and the side opposite to the corner is relatively far away from the central axis of the rotating shaft 100. This increases the size of the side of the first channel 300a that is far away from the central axis of the rotating shaft 100, which means increasing the area of ​​the side with greater centrifugal force, thereby reducing the resistance and pressure loss of oil flow.

[0058] Among them, when the cross-section of the first channel 300a is an arc-shaped hole, the center of the arc-shaped hole is located on the central axis of the rotating shaft 100.

[0059] In some embodiments, please refer to Figure 1 and Figure 7 The motor rotor includes a squirrel cage, which comprises guide bars 410 and end rings 420 connected to both ends of the guide bars 410. Specifically, the guide bars 410 carry induced current and are subjected to electromagnetic force in a rotating magnetic field, generating electromagnetic torque that enables the motor to drive the load. Multiple guide bars 410 are spaced apart between the end rings 420 at both ends to form a cage-like structure. The outer peripheral walls of the first rotor core assembly 200 and the second rotor core assembly 300 have slots for the guide bars 410 to extend.

[0060] The end ring 420 abuts against the end of the first rotor core assembly 200 that is away from the second rotor core assembly 300, allowing heat from the first rotor core assembly 200 to be transferred and dissipated through the end ring 420. Along the radial direction of the shaft 100, the projection of the end ring 420 along the axial direction of the shaft 100 is radially outside the first oil passage 200a. That is, the first oil passage 200a is closer to the shaft 100 than the end ring 420. Thus, the oil flowing out of the first oil passage 200a can first enter the inner cavity defined by the inner ring surface of the end ring 420, and then, under the action of centrifugal force, further disperse within the inner cavity to flow towards the inner ring surface of the end ring 420, thereby carrying away the heat transferred from the first rotor core assembly 200 to the end ring 420, and indirectly cooling the first rotor core assembly 200.

[0061] In some embodiments, multiple sets of first rotor core assemblies 200 are provided, and a second rotor core assembly 300 is sandwiched between two sets of first rotor core assemblies 200. Oil flows into the annular gap 300b and continues to flow into the first oil passages 200a of the first rotor core assemblies 200 on both axial sides.

[0062] Each first rotor core assembly 200 includes a plurality of first rotor plates stacked axially, and each second rotor core assembly 300 includes at least one second rotor plate. Each of the plurality of first rotor plates has an oil hole, and the axial stacking of the plurality of first rotor plates aligns and connects the corresponding oil holes to form a first oil passage 200a. Each of the plurality of second rotor plates has a through hole, and the axial stacking of the plurality of second rotor plates aligns and connects the corresponding through holes to form a first channel 300a.

[0063] The first and second rotor plates can be made of silicon steel.

[0064] In some embodiments, please refer to Figure 1 The rotating shaft 100 includes an axially extending first channel 100a and a radially extending second channel 100b, with the second channel 100b connecting the first channel 100a and the annular gap 300b. During installation, the rotating shaft 100 passes through the first channel 300a. After the rotating shaft oil passage of the rotating shaft 100 is radially aligned with the annular gap 300b of the second rotor core assembly 300, the connection between the rotating shaft channel and the annular gap 300b is achieved, making installation relatively simple and convenient. Multiple second channels 100b are provided, and they are equally spaced circumferentially.

[0065] This application also provides an electric motor, including a motor rotor and a motor stator, wherein the motor stator provides a mounting cavity and the motor rotor is disposed within the mounting cavity.

[0066] This application also provides a vehicle, including a motor, wheels, and a vehicle body, with the motor mounted on the vehicle body.

[0067] Vehicles refer to wheeled vehicles that are driven or towed by a power unit and used for carrying passengers or goods on roads, or for special engineering operations. Vehicles include electric vehicles / electric cars, pure electric vehicles, hybrid electric vehicles, range-extended electric vehicles, plug-in hybrid electric vehicles, and new energy vehicles.

[0068] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of the specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of protection.

Claims

1. A motor rotor, characterized in that, It includes a rotating shaft, a first rotor core assembly and a second rotor core assembly, both of which are sleeved on the rotating shaft and are stacked along the axial direction of the rotating shaft. The first rotor core assembly is provided with a plurality of first oil passages, which extend along the axial direction of the shaft and penetrate through the two end faces of the first rotor core assembly. The second rotor core assembly has a first channel that passes through both end faces of the second rotor core assembly, and the rotating shaft is disposed within the first channel; There is an annular gap between the outer peripheral wall of the rotating shaft and the inner wall of the first channel. The annular gap extends along the axial direction of the rotating shaft. A plurality of first oil passages are distributed circumferentially along the annular gap, and at least part of the projection of each first oil passage along the axial direction of the rotating shaft is within the annular gap, so that each first oil passage is connected to the annular gap.

2. The motor rotor according to claim 1, characterized in that, The first channel has a circular cross-section. Along the radial direction of the first channel, the minimum distance between each of the first oil passages and the central axis of the first channel is equal, and the minimum distance is less than the radius of the first channel.

3. The motor rotor according to claim 2, characterized in that, Each of the first oil passages is equally spaced along the circumference of the annular gap.

4. The motor rotor according to claim 2, characterized in that, Along the radial direction of the first channel, the maximum distance between each of the first oil passages and the central axis of the first channel is equal, and the maximum distance is greater than or equal to the radius of the first channel.

5. The motor rotor according to claim 1, characterized in that, The cross-sectional shape of the first oil passage is circular, polygonal, or arc-shaped.

6. The motor rotor according to claim 1, characterized in that, The motor rotor includes a squirrel cage, the squirrel cage includes guide bars and end rings connected to both ends of the guide bars, the end rings abut against the end of the first rotor core assembly away from the second rotor core assembly, wherein, along the radial direction of the rotating shaft, the projection of the end rings along the axial direction of the rotating shaft is located outside the first oil passage.

7. The motor rotor according to claim 1, characterized in that, The first rotor core group is provided in multiple groups, and each first rotor core group includes multiple first rotor plates stacked along the axial direction. The second rotor core group is sandwiched between two of the second rotor core groups, and the second rotor core group includes at least one second rotor plate.

8. The motor rotor according to claim 1, characterized in that, The rotating shaft has a rotating shaft oil passage, which includes a first branch extending axially and a second branch extending radially, the second branch communicating between the first branch and the annular gap.

9. An electric motor, characterized in that, Includes the motor rotor 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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