Motor oil cooling structure, motor and vehicle

Abstract

The invention provides a motor oil cooling structure, a motor and a vehicle, and relates to the technical field of automobile parts, the motor oil cooling structure comprises a rotor iron core and a stator iron core sleeving the rotor iron core, a gap between the rotor iron core and the stator iron core forms a cavity, the stator iron core is provided with a winding groove communicated with the cavity, and the winding groove is communicated with the rotor iron core. The rotor iron core is provided with a second oil channel and a first oil channel arranged in a penetrating mode in the axial direction, the oil inlet end of the second oil channel is communicated with the first oil channel, and the oil outlet end of the second oil channel penetrates through the outer side wall of the rotor iron core in the radial direction of the rotor iron core and is communicated with the cavity. Therefore, the cooling oil in the first oil duct can be thrown to the gap between the rotor core and the stator core along the second oil duct under the action of centrifugal force, and enters the winding slot, so that the local overheating point of the winding in the stator core is sprayed and cooled, and the local overheating phenomenon of the motor is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts, and in particular to a motor oil cooling structure, a motor and a vehicle. Background Art

[0002] Since the motor generates heat during operation, causing the temperature of the motor components to rise and affecting the service life of the motor, the motor needs to be cooled.

[0003] At present, oil-cooled motors usually adopt a combination of stator oil spray cooling and rotor oil throwing cooling. Among them, stator oil spray cooling usually adopts spray cooling of the stator end winding, and opens oil holes on the stator core, uses cooling oil to flow in the oil holes to cool the stator core, or directly sprays cooling oil on the surface of the stator core for cooling. Rotor oil throwing cooling usually adopts opening holes on the rotating shaft, and throws the cooling oil onto the stator end winding and the rotor core by rotating oil throwing.

[0004] However, the above method has the problem that the oil cannot contact the winding inside the stator core, and thus cannot cool the winding inside the stator core, resulting in excessively high temperature of the local winding inside the stator core, making the motor prone to local overheating, greatly limiting the power output of the oil-cooled motor. Summary of the invention

[0005] The problem solved by the invention is: how to improve the cooling effect of the stator winding of the motor to avoid local overheating of the motor.

[0006] In order to solve the above problems, the present invention provides a motor oil cooling structure, a motor and a vehicle.

[0007] In the first aspect, the present invention provides an oil cooling structure of an electric motor, comprising a rotor core and a stator core sleeved on the rotor core, wherein the gap between the rotor core and the stator core constitutes a cavity; the stator core is provided with a winding slot extending axially therethrough, and the winding slot is connected to the cavity; the rotor core is provided with a first oil channel and a second oil channel, the first oil channel extending axially therethrough, the oil inlet end of the second oil channel being connected to the first oil channel, and the oil outlet end of the second oil channel extending through the radial outer side wall of the rotor core and being connected to the cavity, so that the cooling oil in the first oil channel flows into the winding slot through the second oil channel and the cavity in sequence.

[0008] Optionally, the rotor core includes a first rotor core segment and a second rotor core segment alternately arranged along its axial direction, the first rotor core segment is located at both axial ends of the rotor core, and the second oil channel is arranged on the second rotor core segment.

[0009] Optionally, the first oil channel is arranged to penetrate in a direction parallel to the central axis of the rotor core.

[0010] Optionally, the rotor core is further provided with a first magnetic steel slot group which is arranged to penetrate the rotor core along its axial direction, the first magnetic steel slot group is arranged corresponding to the first oil passage, the first magnetic steel slot group includes two first magnetic steel slots which are arranged at an angle, and the two first magnetic steel slots are respectively located on both sides of the corresponding first oil passage along the circumferential direction of the rotor core; the second oil passage is located between the two first magnetic steel slots of the first magnetic steel slot group, and is located on a side of the first oil passage away from the central axis of the second rotor core segment;

[0011] Alternatively, the rotor core is further provided with a second magnetic steel slot group extending through the rotor core along its axial direction, the second magnetic steel slot group is arranged corresponding to the first oil passage, and is located on a side of the corresponding first oil passage away from the central axis of the rotor core, the second magnetic steel slot group includes two second magnetic steel slots arranged at an angle, the second magnetic steel slot includes a first slot section and a second slot section that are connected to each other, the first slot section is used to install magnetic steel, the second slot section is located on one side or both sides of the first slot section along the circumferential direction of the rotor core, the second oil passage includes a first channel and a second channel, the oil inlet end and the oil outlet end of the first channel are respectively connected to the first oil passage and the second slot section, the oil inlet end and the oil outlet end of the second channel are respectively connected to the second slot section and the cavity, and the cooling oil in the first oil passage flows into the winding slot through the first channel, the second slot section, the second channel and the cavity in sequence;

[0012] Alternatively, the rotor core is further provided with a main oil channel and a third magnetic steel groove which are arranged to penetrate the rotor core axially, the third magnetic steel groove is arranged perpendicular to the radial direction of the rotor core, the main oil channel is located on the side of the third magnetic steel groove close to the central axis of the rotor core, and the first oil channel is located on the side of the third magnetic steel groove away from the central axis of the rotor core.

[0013] Optionally, the stator core is provided with a third oil channel and a fourth oil channel, the third oil channel is arranged to penetrate the stator core axially, and the oil inlet end and the oil outlet end of the fourth oil channel are respectively connected to the third oil channel and the winding slot, so that the cooling oil in the third oil channel flows into the winding slot through the fourth oil channel.

[0014] Optionally, the stator core includes a first stator core segment and a second stator core segment alternately arranged along its axial direction, the first stator core segment is located at both axial ends of the stator core, and the fourth oil channel is arranged on the second stator core segment.

[0015] Optionally, the plurality of second oil passages form a group of rotor oil passages, the rotor oil passages and the first oil passages are arranged correspondingly, the oil inlet ends of the plurality of second oil passages in each group of the rotor oil passages are respectively communicated with the corresponding first oil passages, and the oil outlet ends of the plurality of second oil passages in each group of the rotor oil passages are arranged at intervals along the circumferential direction of the rotor core;

[0016] And / or, the third oil channel is arranged on the outer side wall of the stator core along the radial direction.

[0017] Optionally, a notch is provided on one side of the winding slot close to the central axis of the stator core, the winding slot is connected with the cavity at the notch, an insulating member that fits with its slot wall is provided in the winding slot, and an opening is provided at a position of the insulating member corresponding to the notch, and in the circumferential direction of the stator core, the spacing between the first edge of the opening and the first edge of the notch is greater than or equal to the minimum insulation distance between the stator core and the stator winding, and the first edge of the opening and the first edge of the notch are located on the same side of the opening.

[0018] In a second aspect, the present invention provides a motor, comprising the motor oil cooling structure as described above.

[0019] In a third aspect, the present invention provides a vehicle, comprising the motor oil cooling structure as described above, or comprising the motor as described above.

[0020] The beneficial effect of the motor oil cooling structure of the present invention is that the rotor core can be cooled by arranging a first oil passage on the rotor core and penetrating the first oil passage along its axial direction so that the rotor core can be cooled by the cooling oil flowing in the first oil passage. At the same time, by arranging a second oil channel on the rotor core, and connecting the oil inlet end of the second oil channel with the first oil channel, and passing the oil outlet end of the second oil channel through the radial outer wall of the rotor core, the second oil channel is connected with the gap (i.e., the cavity) between the rotor core and the stator core. In this way, when the rotor core rotates at a high speed, the cooling oil flowing in the first oil channel can be thrown to the gap between the rotor core and the stator core along the second oil channel under the action of centrifugal force. Since the winding slots of the stator core are connected with the cavity formed by the gap, the cooling oil can further enter the winding slots of the stator core to spray cool the local part of the stator winding located in the winding slots near the inner end, thereby accurately guiding the cooling oil to the local overheating point of the winding inside the stator core (i.e., the inner end of the winding inside the stator core) for spray cooling, so as to avoid local overheating of the motor, effectively reduce the temperature of the motor winding and even the motor, so that the motor has the ability to continue to increase power output and power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is a schematic diagram of the structure of the motor oil cooling structure in an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the exploded structure of the motor oil cooling structure in an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the assembly structure of the motor oil cooling structure, stator winding and magnetic steel in an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the structure of the first rotor core segment and the first stator core segment in an embodiment of the present invention;

[0025] Figure 5 It is a schematic structural diagram of a second rotor core segment and a second stator core segment in the first embodiment of the present invention;

[0026] Figure 6 It is a schematic structural diagram of a second rotor core segment and a second stator core segment in a second embodiment of the present invention;

[0027] Figure 7 It is a schematic structural diagram of a second rotor core segment and a second stator core segment in a third embodiment of the present invention;

[0028] Figure 8 It is a schematic structural diagram of the stator core at the notch of the winding slot and the opening of the insulating member in an embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 1. rotor core; 11. first rotor core section; 12. second rotor core section; 13. main oil channel; 14. first magnetic steel slot group; 141. first magnetic steel slot; 15. second magnetic steel slot group; 151. second magnetic steel slot; 151a. first slot section; 151b. second slot section; 16. third magnetic steel slot; 17. first oil channel; 18. second oil channel; 181. first channel; 182. second channel; 2. stator core; 21. first stator core section; 22. second stator core section; 23. winding slot; 231. slot; 24. third oil channel; 25. fourth oil channel; 3. cavity; 4. insulating member; 41. opening; 100. magnetic steel; 200. stator winding. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0032] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0033] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0034] In the related art, oil-cooled motors usually adopt a combination of stator oil spray cooling and rotor oil throwing cooling. Among them, stator oil spray cooling usually adopts spray cooling of the stator end windings, and opens oil holes on the stator core, uses the cooling oil to flow in the oil holes to cool the stator core, or directly sprays the cooling oil on the surface of the stator core for cooling. Rotor oil throwing cooling usually adopts opening holes on the rotating shaft, and throws the cooling oil onto the stator end windings and the rotor core by rotating the oil. However, the above method has the problem that the oil cannot contact the windings inside the stator core, and thus the windings inside the stator core cannot be cooled, resulting in excessively high temperatures of the local windings inside the stator core, making the motor prone to local overheating, which greatly limits the output power of the oil-cooled motor.

[0035] In view of the problems existing in the above-mentioned related technologies, the present invention provides a motor oil cooling structure, a motor and a vehicle.

[0036] Combination Figures 1 to 3As shown, an oil cooling structure of a motor provided by an embodiment of the present invention comprises a rotor core 1 and a stator core 2 sleeved on the rotor core 1, the gap between the rotor core 1 and the stator core 2 constitutes a cavity 3; the stator core 2 is provided with a winding slot 23 penetrating along its axial direction, and the winding slot 23 is communicated with the cavity 3; the rotor core 1 is provided with a first oil passage 17 and a second oil passage 18, the first oil passage 17 penetrating along the axial direction of the rotor core 1, the oil inlet end of the second oil passage 18 is communicated with the first oil passage 17, the oil outlet end of the second oil passage 18 penetrates the outer radial wall of the second rotor core segment 12 and is communicated with the cavity 3, so that the cooling oil in the first oil passage 17 flows into the winding slot 23 through the second oil passage 18 and the cavity 3 in sequence.

[0037] It should be noted that the rotor core 1 and the stator core 2 are usually hollow cylindrical structures, and the stator core 2 is sleeved on the rotor core 1, and the gap between the rotor core 1 and the stator core 2 forms an annular cavity 3. For the convenience of description, Figures 1 to 7 In the figures, the rotor core 1 and the stator core 2 are illustrated with their segments cut out.

[0038] Specifically, the stator core 2 is provided with a winding slot 23 for installing the stator winding 200. The winding slot 23 is arranged to penetrate the stator core 2 along the axial direction and is located at one end of the stator core 2 close to the central axis. Moreover, the winding slot is connected to the cavity 3. That is to say, the winding slot 23 is usually provided with a slot 231 to be described later, so that the winding slot 23 is connected to the cavity 3 at the slot 231. In addition, there are usually a plurality of winding slots 23, and the plurality of winding slots 23 are arranged at intervals along the circumferential direction of the stator core 2. The rotor core 1 is provided with a first oil channel 17 for accommodating cooling oil and a second oil channel 18 for guiding cooling oil. Moreover, the first oil channel 17 penetrates the entire rotor core 1 along the axial direction of the rotor core 1. The first oil channel 17 can be the main oil channel 13 (described later) provided on the rotor core 1 itself, or it can be a newly provided oil channel structure, for example Figure 8 As shown in . The second oil passage 18 can be extended along the radial direction of the rotor core 1, or can be extended in a direction that is set at an acute angle to the radial direction of the rotor core 1, which is not specifically limited here. In addition, the oil inlet end of the second oil passage 18 is connected to the first oil passage 17, and the oil outlet end of the second oil passage 18 passes through the outer wall of the rotor core 1, so that the second oil passage 18 is connected to the cavity 3. Among them, the outer wall of the rotor core 1 refers to the side of the rotor core 1 away from the central axis, and correspondingly, the inner wall of the rotor core 1 refers to the side of the rotor core 1 close to the central axis.

[0039] The motor oil cooling structure in this embodiment can be provided with a first oil passage 17 on the rotor core 1, and the first oil passage 17 is provided along the axial direction thereof, so that the rotor core 1 can be cooled by the cooling oil flowing in the first oil passage 17. At the same time, by providing a second oil passage 18 on the rotor core 1, and connecting the oil inlet end of the second oil passage 18 with the first oil passage 17, and connecting the oil outlet end of the second oil passage 18 through the radial outer wall of the rotor core 1, so that the second oil passage 18 is connected with the gap (i.e., the cavity 3) between the rotor core 1 and the stator core 2, when the rotor core 1 rotates at a high speed, the cooling oil flowing in the first oil passage 17 can be thrown to the gap between the rotor core 1 and the stator core 2 along the second oil passage 18 under the action of centrifugal force. Since the winding slots 23 of the stator core 2 are connected with the cavity 3 formed by the gap, the cooling oil can further enter the winding slots 23 of the stator core 2, thereby cooling the stator winding. 200 A local part of the winding slot 23 is spray-cooled near one end on the inner side, thereby accurately guiding the cooling oil to the local overheating point of the winding inside the stator core 2 (i.e., one end of the winding inside the stator core 2) for spray-cooling, so as to avoid local overheating of the motor, thereby effectively reducing the temperature of the motor winding and even the motor, so that the motor has the ability to continue to increase power output and power density; moreover, there is no need to extend the axial dimension of the motor to reduce the reaction potential energy, so as to reduce the heat generated by the stator and rotor and reduce the temperature of the motor, thereby shortening the axial dimension of the motor, saving valuable layout space for the whole vehicle, and at the same time, reducing the production cost of the motor.

[0040] Optionally, combined Figure 1 and Figure 2 As shown, the rotor core 1 includes first rotor core segments 11 and second rotor core segments 12 alternately arranged along its axial direction. The first rotor core segments 11 are located at the axial ends of the rotor core 1, and the second oil passage 18 is arranged on the second rotor core segment 12.

[0041] Specifically, the rotor core 1 includes at least two first rotor core segments 11 and at least one second rotor core segment 12 , the first rotor core segments 11 and the second rotor core segments 12 are alternately arranged along the axial direction, and both axial ends of the rotor core 1 are first rotor core segments 11 . Figure 1 and Figure 2In the example in which the rotor core 1 includes two first rotor core segments 11 and one second rotor core segment 12, in other examples, the rotor core 1 may also include three first rotor core segments 11 and two second rotor core segments 12, which is not specifically limited here. Since the first oil passage 17 runs through the entire rotor core 1 along the axial direction of the rotor core 1, it is equivalent to the first oil passage 17 running through each first rotor core segment 11 and each second rotor core segment 12. In other words, each first rotor core segment 11 and each second rotor core segment 12 is provided with a first oil passage 17 that runs through along the axial direction.

[0042] More specifically, the oil inlet end of the second oil passage 18 is connected to the first oil passage 17 on the second rotor core segment 12, and the oil outlet end of the second oil passage 18 passes through the outer side wall of the second rotor core segment 12. The outer side wall of the second rotor core segment 12 refers to the side of the second rotor core segment 12 away from the central axis, and correspondingly, the inner side wall of the second rotor core segment 12 refers to the side of the second rotor core segment 12 close to the central axis. The second oil passage 18 can be extended along the radial direction of the second rotor core segment 12, or can be extended along a direction that is set at an acute angle to the radial direction of the second rotor core segment 12, which is not specifically limited here. Moreover, on the second rotor core segment 12, the second oil passage 18 may be a through-hole structure, in which case the inner wall of the second oil passage 18 is a closed annular structure, or the second oil passage 18 may be a groove structure having other open ends in addition to the oil inlet end and the oil outlet end, in which case the inner wall of the second oil passage 18 is an open semi-enclosed structure, or the inner wall of the second oil passage 18 is two spaced and oppositely disposed wall surfaces, such as Figure 2 In practical applications, the design can be selected according to needs, and no specific limitation is made here.

[0043] In this optional embodiment, by dividing the rotor core 1 into a first rotor core segment 11 and a second rotor core segment 12 which are alternately arranged along the axial direction thereof, and arranging the second oil passage 18 on the second rotor core segment 12, on the one hand, it is convenient to manufacture the rotor core 1 in sections and to process the second oil passage 18, thereby improving production efficiency; on the other hand, since the second oil passage 18 is arranged on the second rotor core segment 12, when the second rotor core segment 12 fails or is damaged due to processing of the second oil passage 18, it is only necessary to replace the second rotor core segment 12 without replacing the entire rotor core 1, thereby reducing processing and maintenance costs to a great extent.

[0044] Optionally, combined Figure 2As shown, the second oil passage 18 is arranged to penetrate in a direction parallel to the central axis of the second rotor core segment 12. In this way, on the one hand, the volume of the second oil passage 18 can be increased, thereby increasing the amount of cooling oil thrown into the cavity 3 when the rotor core 1 rotates, thereby improving the cooling effect. On the other hand, compared with the second oil passage 18 being arranged to penetrate in a direction that is arranged at an angle to the axis of the second rotor core segment 12, it can ensure that the structures of the various core sheets pressed into the second rotor core segment 12 are the same, which not only reduces the types of core sheets, but also improves the convenience of processing the second oil passage 18 on the second rotor core segment 12, thereby improving the production efficiency of the second rotor core segment 12 and even the entire rotor core 1.

[0045] Optionally, combined Figure 6 As shown, the rotor core 1 is further provided with a first magnetic steel slot group 14 extending through the rotor core 1 in the axial direction thereof. The first magnetic steel slot group 14 is provided corresponding to the first oil passage 17. The first magnetic steel slot group 14 includes two first magnetic steel slots 141 provided at an angle. The two first magnetic steel slots 141 are respectively located on both sides of the corresponding first oil passage 17 along the circumferential direction of the rotor core 1; the second oil passage 18 is located between the two first magnetic steel slots 141 of the first magnetic steel slot group 14, and is located on the side of the first oil passage 17 away from the central axis of the second rotor core segment 12.

[0046] In this optional embodiment, the first oil passage 17 is configured as the main oil passage 13, and the main oil passage 13 is usually a cooling oil passage structure provided on the rotor core 1, which is mainly used to cool the rotor core 1. Therefore, in order to simplify the structure of the rotor core 1 and reduce the processing technology, the main oil passage 13 can be used as the first oil passage 17, that is, the oil inlet end of the second oil passage 18 is connected to the main oil passage 13. The two first magnetic steel slots 141 of the first magnetic steel slot group 14 are arranged at intervals along the circumference of the rotor core 1, and the angle formed by the two first magnetic steel slots 141 is usually greater than 0° and does not exceed 180°, that is, less than or equal to 180°, and the second oil passage 18 is located between the two first magnetic steel slots 141 and located on the radial outside of the main oil passage 13, that is, the main oil passage 13 is away from the side of the central axis of the second rotor core segment 12. When the two first magnetic steel slots 141 of the first magnetic steel slot group 14 are arranged at an acute angle, a right angle or an obtuse angle, it is equivalent to that the two first magnetic steel slots 141 in the first magnetic steel slot group 14 are distributed in a "V" shape on both sides of the circumference of the main oil passage 13. In this way, the rotor core 1 provided with the first oil passage 17 and the second oil passage 18 can be applicable to the rotor core 1 in which the magnetic steel slots are distributed in a "V" shape, for example, and the rotor core 1 in which the magnetic steel slots are distributed in a "U" shape, for example, on both sides of the circumference of the main oil passage 13.

[0047] Optionally, combined Figures 3 to 5As shown, the rotor core 1 is further provided with a second magnetic steel slot group 15 which is arranged along the axial direction thereof, the second magnetic steel slot group 15 is arranged corresponding to the first oil passage 17, and is located on the side of the corresponding first oil passage 17 which is away from the central axis of the rotor core 1, the second magnetic steel slot group 15 includes two second magnetic steel slots 151 which are arranged at an angle, the second magnetic steel slot 151 includes a first slot section 151a and a second slot section 151b which are connected to each other, the first slot section 151a is used to install the magnetic steel 100, and the second slot section 151b is located at the first The slot section 151a is along one or both sides of the circumference of the rotor core 1, and the second oil passage 18 includes a first channel 181 and a second channel 182. The oil inlet end and the oil outlet end of the first channel 181 are respectively connected to the first oil passage 17 and the second slot section 151b, and the oil inlet end and the oil outlet end of the second channel 182 are respectively connected to the second slot section 151b and the cavity 3. The cooling oil in the first oil passage 17 flows into the winding slot 23 through the first channel 181, the second slot section 151b, the second channel 182 and the cavity 3 in sequence.

[0048] In this optional embodiment, the first oil passage 17 is configured as the main oil passage 13 in the same manner as in the above-mentioned embodiment, and will not be described in detail here. The two second magnetic steel slots 151 of the second magnetic steel slot group 15 are arranged at intervals along the circumference of the rotor core 1, and the angle formed by the two second magnetic steel slots 151 is usually greater than 0° and does not exceed 180°, that is, less than or equal to 180°, and the second oil passage 18 is located between the two second magnetic steel slots 151 and located radially outside the main oil passage 13. The second magnetic steel slot 151 includes a first slot section 151a for mounting the magnetic steel 100 and a second slot section 151b for serving as a cooling oil passage, and the second slot section 151b can be arranged on one side or both sides of the first slot section 151a along the circumferential direction. Since the spacing between the two second magnetic steel slots 151 of the second magnetic steel slot group 15 is usually small, it may not be possible to directly set an independent oil channel structure between the two second magnetic steel slots 151 to connect the main oil channel 13 and the cavity 3. Therefore, in this embodiment, the second oil channel 18 is divided into a first channel 181 and a second channel 182, and the oil inlet end of the first channel 181 is connected to the main oil channel 13 on the second rotor core segment 12, the oil outlet end of the second channel 182 is connected to the cavity 3, and the oil outlet end of the first channel 181 and the oil inlet end of the second channel 182 are connected to the second slot segment 151b. Among them, when the second slot segments 151b are provided on both sides of the first slot segment 151a along the circumferential direction, the oil outlet end of the first channel 181 and the oil inlet end of the second channel 182 are both connected to the second slot segment 151b located on the same side of the second magnetic steel slot 151. In addition, the rotor core 1 in the present embodiment may also be provided with a first magnetic steel slot group 14, and the two first magnetic steel slots 141 in the first magnetic steel slot group 14 are distributed in a "V" shape on both sides of the circumference of the main oil channel 13. In this way, the rotor core 1 provided with the first oil channel 17 and the second oil channel 18 can not only be applied to the rotor core 1 in which the magnetic steel slots are distributed in a "V" shape on the radial outside of the main oil channel 13, but also can be applied to the motor with a 48-slot 8-pole structure. Among them, 8 poles means that the rotor of the motor has eight pole pairs, that is, eight pairs of NS poles (the magnetic steel in one second magnetic steel slot group 15 and one first magnetic steel slot group 14 constitute a pair of NS poles), and 48 slots means that the stator core 2 of the motor is provided with a total of 48 winding slots 23.

[0049] Optionally, combined Figure 8 As shown, the rotor core 1 is also provided with a main oil passage 13 and a third magnetic steel groove 16 which are arranged to penetrate along its axial direction. The third magnetic steel groove 16 is arranged perpendicular to the radial direction of the rotor core 1. The main oil passage 13 is located on the side of the third magnetic steel groove 16 close to the central axis of the rotor core 1, and the first oil passage 17 is located on the side of the third magnetic steel groove 16 away from the central axis of the rotor core 1.

[0050] In this optional embodiment, the main oil passage 13 is usually a cooling oil passage structure provided on the rotor core 1, which is mainly used to cool the rotor core 1. The third magnetic steel slot 16 is arranged perpendicular to the radial direction of the rotor core 1, so that the third magnetic steel slot 16 on the rotor core 1 is distributed in a "one" shape on the radial outer side of the main oil passage 13, that is, the side of the main oil passage 13 away from the central axis of the rotor core 1. This arrangement of magnetic steel slots may hinder the second oil passage 18 from connecting the main oil passage 13 and the cavity 3. Therefore, this embodiment adopts a cooling oil passage as the first oil passage 17 on the side of the third magnetic steel slot 16 away from the central axis of the rotor core 1, that is, on the radial outer side of the third magnetic steel slot 16, instead of using the main oil passage 13 located on the radial inner side of the third magnetic steel slot 16 as the first oil passage 17, wherein the radial inner side of the third magnetic steel slot 16 is the side of the third magnetic steel slot 16 close to the central axis of the rotor core 1. In addition, the rotor core 1 in this embodiment may also be provided with a first magnetic steel slot group 14, and the two first magnetic steel slots 141 in the first magnetic steel slot group 14 are distributed in a "V" shape on both sides of the circumference of the main oil passage 13. In this way, the rotor core 1 provided with the first oil passage 17 and the second oil passage 18 is not only applicable to the rotor core 1 in which the magnetic steel slots are distributed in a "one" shape on the radial outer side of the main oil passage 13, but also applicable to the rotor core 1 in which the "V" shape + "one" shape distribution is adopted.

[0051] Optionally, combined Figure 2 , Figures 5 to 7 As shown, the stator core 2 is provided with a third oil passage 24 and a fourth oil passage 25. The third oil passage 24 is arranged to penetrate along the axial direction of the stator core 2. The oil inlet end and the oil outlet end of the fourth oil passage 25 are respectively connected to the third oil passage 24 and the winding slot 23, so that the cooling oil in the third oil passage 24 flows into the winding slot 23 through the fourth oil passage 25.

[0052] In this optional embodiment, the oil outlet end of the fourth oil passage 25 is usually connected to the side of the winding slot 23 away from the central axis of the stator core 2. In this way, after the cooling oil sprayed to the end of the stator winding 200 cools the end of the stator winding 200, it can enter the stator core 2 from the third oil passage 24 to cool the stator core 2. At the same time, the cooling oil flowing in the third oil passage 24 can flow into the winding slot 23 through the fourth oil passage 25 to cool the outer side of the part of the stator winding 200 located inside the stator core 2. Therefore, on the basis of using the first oil passage 17 and the second oil passage 18 on the rotor core 1 to cool the inner side of the part of the stator winding 200 located inside the stator core 2, both the inner side and the outer side of the winding inside the stator core 2 can be cooled, which can greatly improve the cooling effect of the winding inside the stator core 2.

[0053] Optionally, combined Figure 2 , Figures 5 to 7As shown, the stator core 2 includes first stator core segments 21 and second stator core segments 22 alternately arranged along its axial direction. The first stator core segments 21 are located at the axial ends of the stator core 2, and the fourth oil channel 25 is arranged on the second stator core segment 22.

[0054] Specifically, the stator core 2 includes at least two first stator core segments 21 and at least one second stator core segment 22 . The first stator core segments 21 and the second stator core segments 22 are alternately arranged along the axial direction, and both axial ends of the stator core 2 are first stator core segments 21 . Figure 1 and Figure 2 An example is given in which the stator core 2 includes two first stator core segments 21 and one second stator core segment 22, but in other examples, the stator core 2 may also include three first stator core segments 21 and two second stator core segments 22, which are not specifically limited here. At the same time, the first stator core segment 21 and the second stator core segment 22 are respectively arranged corresponding to the first rotor core segment 11 and the second rotor core segment 12. Since the third oil passage 24 runs through the entire stator core 2 along the axial direction of the stator core 2, it is equivalent to the third oil passage 24 running through each first stator core segment 21 and each second stator core segment 22. In other words, each first stator core segment 21 and each second stator core segment 22 is provided with a third oil passage 24 that runs through along the axial direction.

[0055] More specifically, the oil inlet end of the fourth oil channel 25 is connected to the third oil channel 24 on the second stator core segment 22, and the oil outlet end of the fourth oil channel 25 is connected to the winding slot 23. The fourth oil channel 25 can be extended along the radial direction of the second stator core segment 22, or can be extended along a direction that is set at an acute angle to the radial direction of the second stator core segment 22, and is not specifically limited here. Moreover, on the second stator core segment 22, the fourth oil channel 25 can be a through-hole structure, in which case the inner wall of the fourth oil channel 25 is a closed annular structure, or the fourth oil channel 25 can be a slot structure having other open ends in addition to the oil inlet end and the oil outlet end, in which case the inner wall of the fourth oil channel 25 is an unclosed semi-enclosed structure, or the inner wall of the fourth oil channel 25 is two spaced-apart and oppositely disposed wall surfaces, such as Figure 2 In practical applications, the design can be selected according to needs, and no specific limitation is made here.

[0056] In this optional embodiment, by dividing the stator core 2 into a first stator core segment 21 and a second stator core segment 22 alternately arranged along its axial direction, and arranging the fourth oil channel 25 on the second stator core segment 22, on the one hand, it is convenient to manufacture the stator core 2 in sections and to process the fourth oil channel 25, thereby improving production efficiency; on the other hand, since the fourth oil channel 25 is arranged on the second stator core segment 22, when the second stator core segment 22 fails or is damaged due to processing the fourth oil channel 25, it is only necessary to replace the second stator core segment 22 without replacing the entire stator core 2, thereby reducing processing costs and maintenance costs to a great extent.

[0057] Optionally, combined Figures 5 to 7 As shown, multiple second oil passages 18 form a group of rotor oil passages, and the rotor oil passages and the first oil passages 17 are arranged correspondingly. The oil inlet ends of the multiple second oil passages 18 in each group of rotor oil passages are respectively connected to the corresponding first oil passages 17, and the oil outlet ends of the multiple second oil passages 18 in each group of rotor oil passages are arranged at intervals along the circumference of the rotor core 1.

[0058] In this optional embodiment, a plurality of groups of rotor oil passages and a plurality of first oil passages 17 are usually provided on the second stator core segment 22, and the rotor oil passages and the first oil passages 17 are arranged one by one, the oil inlet ends of the plurality of second oil passages 18 in each group of rotor oil passages are respectively connected with the corresponding first oil passages 17, and the oil outlet ends of the plurality of second oil passages 18 in each group of rotor oil passages are respectively arranged at intervals along the circumference of the rotor core 1, and the spacing between the oil outlet ends of adjacent second oil passages 18 is equal to the spacing between the notches 231 of adjacent winding slots 23. In this way, the amount of oil thrown when the rotor core 1 rotates can be increased by increasing the number of second oil passages 18, ensuring that the local hot spots of the stator winding 200 can contact more cooling oil, thereby improving the cooling effect of the local hot spots of the stator core 2. In addition, the spacing between the oil outlet ends of adjacent second oil channels 18 in each group of rotor oil circuits is set to be equal to the spacing between the slots 231 of adjacent winding slots 23, so that as many winding slots as possible can be simultaneously filled with cooling oil, thereby further improving the cooling effect of the local hot spots of the stator winding 200.

[0059] Optionally, combined Figure 1 As shown, the third oil passage 24 is provided on the outer side wall of the stator core 2 along the radial direction thereof.

[0060] In this optional embodiment, the third oil channel 24 is arranged on the outer wall of the stator core 2, so that the outer wall of the stator core 2 is formed with a notch structure that penetrates along the axial direction. In this way, it is convenient for processing equipment, for example, to perform operations such as retracting the tool from the notch structure, thereby improving the convenience of processing and then improving production efficiency.

[0061] Furthermore, a plurality of third oil passages 24 and a plurality of fourth oil passages 25 are provided, and the plurality of third oil passages 24 are arranged at intervals along the circumferential direction of the stator core 2, and are respectively arranged in one-to-one correspondence with the plurality of winding slots 23, and the plurality of third oil passages 24 are respectively connected with the corresponding winding slots 23 through the plurality of fourth oil passages 25. In this way, the contact area between the cooling oil and the winding inside the stator core 2 is increased by increasing the number of the third oil passages 24 and the fourth oil passages 25, thereby increasing the cooling range of the winding inside the stator core 2 and improving the cooling effect.

[0062] Furthermore, combined with Figures 5 to 7 As shown, the fourth oil passage 25 is arranged to extend in the radial direction of the second stator core segment 22 .

[0063] Since the winding slots 23 on the second stator core segment 22 are usually arranged along the radial direction of the second stator core segment 22, the fourth oil channel 25 is also extended along the radial direction of the second stator core segment 22. On the one hand, it is convenient for processing and manufacturing, and on the other hand, the oil guide path of the fourth oil channel 25 is shorter, so that the cooling oil flowing in the third oil channel 24 can quickly flow into the winding slots 23 through the fourth oil channel 25 to cool the local hot spots of the stator winding 200.

[0064] Furthermore, combined with Figure 2 As shown, the fourth oil passage 25 is arranged to penetrate in a direction parallel to the central axis of the second stator core segment 22. In this way, on the one hand, the volume of the fourth oil passage 25 can be increased, thereby increasing the amount of cooling oil flowing into the winding slot 23 through the fourth oil passage 25, thereby improving the cooling effect. On the other hand, compared with the fourth oil passage 25 being arranged to penetrate in a direction that is arranged at an angle to the axis of the second stator core segment 22, it can ensure that the structures of the various core sheets pressed into the second stator core segment 22 are the same, which not only reduces the types of core sheets, but also improves the convenience of processing the fourth oil passage 25 on the second stator core segment 22, thereby improving the production efficiency of the second stator core segment 22 and even the entire stator core 2.

[0065] Optionally, combined Figure 8 As shown, a notch 231 is provided on one side of the winding slot 23 close to the central axis of the stator core 2, and the winding slot 23 is connected to the cavity 3 at the notch 231. An insulating member 4 is provided in the winding slot 23 to fit the slot wall thereof, and an opening 41 is provided at a position of the insulating member 4 corresponding to the notch 231. In the circumferential direction of the stator core 2, a spacing L between a first edge of the opening 41 and a first edge of the notch 231 is greater than or equal to a minimum insulation distance between the stator winding 200 and the stator core 2, and the first edge of the opening 41 and the first edge of the notch 231 are located on the same side of the opening 41.

[0066] Specifically, in the circumferential direction of the stator core 2, the opening 41 has a first edge and a second edge that are arranged opposite to each other. Similarly, the slot 231 also has a first edge and a second edge that are arranged opposite to each other. At the same time, the first edge of the opening 41 and the first edge of the slot 231 are arranged correspondingly, and the second edge of the opening 41 and the second edge of the slot 231 are arranged correspondingly. Moreover, in the circumferential direction of the stator core 2, the spacing L between the first edge of the opening 41 and the first edge of the slot 231 is greater than or equal to the minimum insulation distance between the stator winding 200 and the stator core 2. Among them, the minimum insulation distance between the stator winding 200 and the stator core 2 is also the creepage distance, that is, the spacing L between the first edge of the opening 41 and the first edge of the slot 231 also needs to satisfy the requirement of being greater than or equal to the creepage distance. Among them, creepage distance refers to the shortest path between two conductive parts or between a conductive part and the protective interface of the equipment measured along the insulating surface, that is, the shortest path between the stator winding 200 and the stator core 2. This distance ensures that when the potential is transferred between the two surfaces, no arc will be generated in the insulating material, thereby avoiding damage to the equipment.

[0067] In this optional embodiment, since an insulating member 4 such as insulating paper is usually required to be provided in the winding slot 23 to protect the stator winding 200 from being scratched during installation and to increase the insulation distance between the stator winding 200 and the stator core 2, but the provision of the insulating member 4 will block the notch 231 of the winding slot 23, it is necessary to provide an opening 41 at a position corresponding to the notch 231 on the insulating member 4 to ensure that the cooling oil thrown into the cavity 3 from the first oil channel 17 of the rotor core 1 through the second oil channel 18 can enter the winding slot 23 from the opening 41 to contact the part of the stator winding 200 located in the stator core 2, so that the coolant oil thrown out when the rotor core 1 rotates can directly dissipate the heat of the winding inside the stator core 2. Moreover, by setting the distance L between the first edge of the opening 41 and the first edge of the slot 231 to be greater than or equal to the smaller of the creepage distance and the minimum insulation distance, the setting of the opening 41 is prevented from affecting the insulation distance between the stator winding 200 and the stator core 2.

[0068] An embodiment of the present invention provides a motor, comprising the motor oil cooling structure as described above.

[0069] In this embodiment, the motor further includes a magnetic steel 100 and a stator winding 200, wherein the magnetic steel 100 is installed in the magnetic steel slot of the rotor core 1, and the stator winding 200 is installed in the winding slot 23 of the stator core 2, and the stator winding 200 can be a flat wire winding or a round wire winding. In addition, the beneficial effects of the motor in this embodiment relative to the prior art are the same as those of the above-mentioned motor oil cooling structure, which will not be repeated here.

[0070] A vehicle provided by an embodiment of the present invention includes the motor oil cooling structure as described above, or includes the motor as described above.

[0071] The beneficial effects of the vehicle of this embodiment relative to the prior art are the same as those of the above-mentioned motor oil cooling structure, which will not be described in detail here.

[0072] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A motor oil cooling structure, It is characterized in that The invention comprises a rotor core (1) and a stator core (2) sleeved on the rotor core (1), wherein a gap between the rotor core (1) and the stator core (2) forms a cavity (3); the stator core (2) is provided with a winding slot (23) penetrating along the axial direction thereof, and the winding slot (23) is communicated with the cavity (3); the rotor core (1) is provided with a first oil passage (17) and a second oil passage (18), wherein the first oil passage (17) is penetrating along the axial direction of the rotor core (1), an oil inlet end of the second oil passage (18) is communicated with the first oil passage (17), and an oil outlet end of the second oil passage (18) penetrates the outer radial wall of the rotor core (1) and is communicated with the cavity (3), so that the cooling oil in the first oil passage (17) flows into the winding slot (23) through the second oil passage (18) and the cavity (3) in sequence.

2. The motor oil cooling structure according to claim 1, It is characterized in that The rotor core (1) comprises first rotor core segments (11) and second rotor core segments (12) which are alternately arranged along the axial direction thereof, the first rotor core segments (11) being located at both axial ends of the rotor core (1), and the second oil passage (18) being arranged on the second rotor core segment (12).

3. The motor oil cooling structure according to claim 2, It is characterized in that The second oil passage (18) is arranged to penetrate in a direction parallel to the central axis of the second rotor core segment (12).

4. The motor oil cooling structure according to claim 2, It is characterized in that The rotor core (1) is further provided with a first magnetic steel slot group (14) which is arranged to penetrate the rotor core along its axial direction, the first magnetic steel slot group (14) being arranged corresponding to the first oil passage (17), the first magnetic steel slot group (14) comprising two first magnetic steel slots (141) arranged at an angle, the two first magnetic steel slots (141) being respectively located on two sides of the corresponding first oil passage (17) along the circumferential direction of the rotor core (1); the second oil passage (18) being located between the two first magnetic steel slots (141) of the first magnetic steel slot group (14), and being located on a side of the first oil passage (17) which is away from the central axis of the second rotor core segment (12); Alternatively, the rotor core (1) is further provided with a second magnetic steel slot group (15) extending through the rotor core along its axial direction, the second magnetic steel slot group (15) being provided corresponding to the first oil passage (17) and being located on a side of the corresponding first oil passage (17) away from the central axis of the rotor core (1), the second magnetic steel slot group (15) comprising two second magnetic steel slots (151) arranged at an angle, the second magnetic steel slot (151) comprising a first slot section (151a) and a second slot section (151b) which are connected to each other, the first slot section (151a) being used for installing the magnetic steel (100), the second slot section (151b) being located at the first slot section (151a) ) along one or both sides of the circumference of the rotor core (1), the second oil passage (18) comprising a first passage (181) and a second passage (182), the oil inlet end and the oil outlet end of the first passage (181) being respectively connected to the first oil passage (17) and the second slot section (151b), the oil inlet end and the oil outlet end of the second passage (182) being respectively connected to the second slot section (151b) and the cavity (3), the cooling oil in the first oil passage (17) flowing into the winding slot (23) via the first passage (181), the second slot section (151b), the second passage (182) and the cavity (3) in sequence; Alternatively, the rotor core (1) is further provided with a main oil passage (13) and a third magnetic steel groove (16) which are arranged to penetrate the rotor core (1) along its axial direction, wherein the third magnetic steel groove (16) is arranged perpendicular to the radial direction of the rotor core (1), the main oil passage (13) is located on a side of the third magnetic steel groove (16) close to the central axis of the rotor core (1), and the first oil passage (17) is located on a side of the third magnetic steel groove (16) away from the central axis of the rotor core (1).

5. The motor oil cooling structure according to any one of claims 1 to 4, It is characterized in that The stator core (2) is provided with a third oil passage (24) and a fourth oil passage (25). The third oil passage (24) is arranged to penetrate the stator core (2) in the axial direction. The oil inlet end and the oil outlet end of the fourth oil passage (25) are respectively connected to the third oil passage (24) and the winding slot (23), so that the cooling oil in the third oil passage (24) flows into the winding slot (23) through the fourth oil passage (25).

6. The motor oil cooling structure according to claim 5, It is characterized in that The stator core (2) comprises a first stator core segment (21) and a second stator core segment (22) which are alternately arranged along the axial direction thereof, the first stator core segment (21) being located at both axial ends of the stator core (2), and the fourth oil passage (25) being arranged on the second stator core segment (22).

7. The motor oil cooling structure according to claim 5, It is characterized in that A plurality of the second oil passages (18) form a group of rotor oil passages, the rotor oil passages and the first oil passages (17) are arranged correspondingly, the oil inlet ends of the plurality of the second oil passages (18) in each group of the rotor oil passages are respectively connected to the corresponding first oil passages (17), and the oil outlet ends of the plurality of the second oil passages (18) in each group of the rotor oil passages are arranged at intervals along the circumferential direction of the rotor core (1); And / or, the third oil channel (24) is provided on the outer side wall of the stator core (2) along the radial direction thereof.

8. The motor oil cooling structure according to claim 1, It is characterized in that A notch (231) is provided on one side of the winding slot (23) close to the central axis of the stator core (2); the winding slot (23) is connected to the cavity (3) at the notch (231); an insulating member (4) is provided in the winding slot (23) and is in contact with the slot wall; an opening (41) is provided on the insulating member (4) at a position corresponding to the notch (231); and in the circumferential direction of the stator core (2), a distance between an edge of the opening (41) and an edge of the notch (231) on the corresponding side is greater than or equal to a minimum insulation distance between the stator core (2) and the stator winding (200).

9. A motor, It is characterized in that It comprises the motor oil cooling structure as described in any one of claims 1 to 8.

10. A vehicle, It is characterized in that It comprises the motor oil cooling structure as described in any one of claims 1 to 8, or comprises the motor as described in claim 9.

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