Motor rotor, motor and vehicle

Abstract

The utility model relates to the technical field of motor cooling, particularly provides a motor rotor, a motor and a vehicle, and aims to solve the problem of low cooling efficiency of an existing motor. In order to achieve the purpose, the motor rotor comprises a rotating shaft, a first channel is formed in the rotating shaft, and an oil inlet hole communicated with the first channel is further formed in the rotating shaft; a plurality of rotor punching sheets, each rotor punching sheet is provided with a plurality of magnetic steel grooves along the circumferential direction, at least part of the rotor punching sheets are provided with through holes, one ends of the through holes are communicated with the magnetic steel grooves, and the other ends of the through holes are communicated with the inner walls of the rotor punching sheets, so that the through holes jointly form a second channel when the plurality of rotor punching sheets are stacked to form a rotor iron core and sleeve the rotating shaft; and the magnetic steel is arranged in the magnetic steel groove, and a third channel along the axial direction of the rotor iron core is defined between the magnetic steel and the end part of the magnetic steel groove. The cooling medium can enter the third channel defined by the end area of the magnetic steel groove along the first channel and the second channel, and is in direct contact with the magnetic steel, so that the cooling efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of motor cooling, and specifically provides a motor rotor, a motor and a vehicle. Background Art

[0002] During the operation of new energy vehicles, in order to prevent the motor from overheating due to long-term operation, the motor needs to be cooled. For motor cooling, oil cooling is now commonly used, that is, cooling oil is circulated into the rotor through the hollow shaft of the rotor.

[0003] At present, electronic rotors generally have cooling oil channels on the rotor punchings. The cooling oil channels are located on one side of the magnetic steel slots. The magnetic steel is fixed in the magnetic steel slots by injection molding or other methods. However, this method still has the problem of low cooling efficiency because the cooling oil cannot directly contact the magnetic steel. When the motor is running at high speed, it is still difficult to solve the problem of serious heating of the magnetic steel.

[0004] Accordingly, the art requires a new motor rotor cooling solution to solve the above problems. Utility Model Content

[0005] The present application aims to solve the above technical problem, that is, to solve the problem of low cooling efficiency of existing motors.

[0006] In a first aspect, the present application provides a motor rotor, comprising:

[0007] A rotating shaft, wherein a first channel is formed inside the rotating shaft, and an oil inlet hole communicating with the first channel is also formed on the rotating shaft;

[0008] a plurality of rotor punchings, each of which is provided with a plurality of magnetic steel slots along the circumferential direction, and at least some of the rotor punchings are provided with through holes, one end of the through holes being connected to the magnetic steel slots, and the other end being connected to the inner wall of the rotor punching, so that when the plurality of rotor punchings are stacked to form a rotor core and sleeved on the rotating shaft, the through holes together form a second channel; and

[0009] A magnetic steel is disposed in the magnetic steel slot, wherein a third channel along the axial direction of the rotor core is defined between the magnetic steel and the end of the magnetic steel slot;

[0010] The oil inlet hole is communicated with the second channel, and the second channel is communicated with the third channel, so that the cooling medium can flow through the oil inlet hole, the second channel and the third channel in sequence along the first channel.

[0011] In a technical solution of the above motor rotor, the outer peripheral surface of the rotor core is at least partially wrapped with an outer protective layer.

[0012] In a technical solution of the above motor rotor, the through holes are arranged along the radial direction of the rotor punching sheets.

[0013] In a technical solution of the motor rotor, the rotor punching sheet includes a first punching sheet and a second punching sheet, and the through hole is opened on the first punching sheet;

[0014] In the axial direction of the rotating shaft, a plurality of the first punching sheets are stacked to form a first core body, and a plurality of the second punching sheets are stacked to form two second core bodies. The two second core bodies are respectively located at two sides of the first core body.

[0015] In a technical solution of the above motor rotor, the outer peripheral surface of the first core is wrapped with the outer protective layer.

[0016] In a technical solution of the motor rotor, the rotor punching sheet includes a first punching sheet, and the through hole is formed on the first punching sheet;

[0017] A plurality of the first punching sheets are stacked to form the rotor core, and the outer peripheral surface of the rotor core is completely wrapped with the outer protective layer.

[0018] In a technical solution of the above motor rotor, the rotor punching sheet includes a third punching sheet, and the through holes are arranged at intervals along the arrangement sequence of the magnetic steel slots;

[0019] A plurality of the third punching sheets are stacked to form a plurality of third cores, and the plurality of the third cores together form the rotor core. The plurality of the third cores are staggered and stacked so that the second channels of adjacent third cores are not in the same plane.

[0020] In a technical solution of the above motor rotor, the outer peripheral surface of the rotor core is completely wrapped with the outer protective layer.

[0021] In a second aspect, the present application provides an electric motor, comprising the electric motor rotor described in any one of the first aspects.

[0022] In a third aspect, the present application provides a vehicle, comprising the motor described in the second aspect.

[0023] As described above, the present application opens through holes connected to the magnetic steel slots on the rotor punchings, so that when the rotor punchings are stacked to form a rotor core, the through holes form a second channel connecting the magnetic steel slots and the first channel in the rotating shaft, so that the cooling medium can enter the third channel defined by the end area of ​​the magnetic steel slots along the first channel and the second channel, and directly contact the magnetic steel, thereby improving the cooling efficiency.

[0024] Furthermore, the rotor core is formed by stacking a first punching sheet and a second punching sheet, and only a through hole is opened on the first punching sheet, so that the first core body formed by the first punching sheet has a second channel, while the second core body formed by the second punching sheet does not have the second channel. In this way, the strength of the rotor core is ensured, and the circulation of the cooling medium is realized through the first core body. On the premise of achieving direct contact between the cooling medium and the magnetic steel and improving the cooling efficiency, the strength of the entire rotor core can also be guaranteed to meet the requirements of high-speed working conditions.

[0025] Furthermore, the rotor core is formed by stacking third punching sheets, and through holes are arranged at intervals on the third punching sheets. The third core bodies formed by the stacking of the third punching sheets are staggered and stacked, which not only reduces the number of through holes on the third punching sheets and improves the strength of the third punching sheets, but also through the staggered stacking of the third core bodies, coolant can enter each third channel along the circumference of the rotor core, thereby realizing cooling of each magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, in which:

[0027] Figure 1 It is a first cross-sectional schematic diagram of the motor rotor along the axial direction provided in the present application;

[0028] Figure 2 It is a schematic diagram of the first punch;

[0029] Figure 3 It is a schematic diagram of the second punch;

[0030] Figure 4 is a second cross-sectional schematic diagram of the motor rotor along the axial direction provided in the present application;

[0031] Figure 5 It is a schematic diagram of the third punch;

[0032] Figure 6 is based on Figure 5 A schematic cross-sectional view along line AA when the third punching sheet is stacked to form a motor rotor;

[0033] Figure 7 is based on Figure 5 A schematic cross-sectional view along line BB when the third punching sheet is stacked to form the motor rotor.

[0034] Reference numerals list :

[0035] 1. Rotating shaft; 11. First channel; 12. Oil inlet hole; 2. Rotor core; 21. Second channel; 22. Third channel; 3. Magnetic steel; 4. Outer sheath;

[0036] 100, magnetic steel groove; 110, vacant area; 120, through hole; 200, first core; 210, second core; 220, third core. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not used to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0038] It should be noted that in the description of this application, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the relevant devices or components must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application. In addition, the ordinal numbers "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Nowadays, as new energy vehicles have higher and higher demands on motor power density, the speed range and maximum speed requirements of the main drive motor are also getting higher and higher. Therefore, in order to ensure the strength of the rotor punching when the motor is running at high speed, the motor's magnetic steel is generally fixed in the magnetic steel slot by injection molding, and the cooling oil channel is set on one side of the magnetic steel slot. In this case, the cooling oil cannot directly contact the magnetic steel, and the thermal conductivity of the injection molding material around the magnetic steel is also relatively poor, resulting in a great impact on the cooling efficiency, and still unable to meet the heat dissipation requirements of the motor under high speed conditions.

[0041] Reference Figure 1 The present application discloses a motor rotor, which includes a rotating shaft 1, a rotor core 2 formed by stacking a plurality of rotor punching sheets, and a magnetic steel 3 fixedly disposed in the rotor core 2.

[0042] The rotating shaft 1 is a hollow shaft, a first passage 11 is axially opened inside the rotating shaft 1 , and an oil inlet hole 12 communicating with the first passage 11 is opened on the wall of the rotating shaft 1 .

[0043] The rotor punchings are provided with a plurality of magnetic steel slots along the circumference thereof to accommodate the magnetic steel 3. At least some of the rotor punchings are provided with through holes, one end of the through holes being connected to the magnetic steel slots and the other end being connected to the inner wall of the rotor punchings, so that when a plurality of rotor punchings are stacked to form the rotor core 2 and sleeved on the rotating shaft 1, the through holes together form a second channel 21.

[0044] The cross-sectional area of ​​the magnetic steel 3 is smaller than the cross-sectional area of ​​the magnetic steel slot. The magnetic steel 3 can be connected to the magnetic steel slot by means of magnetic steel glue fixation, mechanical fixation or expansion coating fixation. A third channel 22 along the axial direction of the rotor core 2 is defined between the end of the magnetic steel 3 close to the axis of the rotor core 2 and the magnetic steel slot. The third channel 22 is connected to the second channel 21, and the second channel 21 is connected to the oil inlet hole 12. Therefore, the cooling medium can directly flow through the oil inlet hole 12, the second channel 21 and the third channel 22 along the first channel 11 in sequence. Under the high-speed rotation of the rotor core 2, the cooling medium is finally thrown out from both ends of the rotor core 2 through the third channel 22. In this way, the cooling medium directly contacts the magnetic steel 3 to cool the magnetic steel 3, thereby improving the cooling efficiency.

[0045] The cooling medium described in the present application includes but is not limited to liquid media such as cooling oil and cooling water.

[0046] In some implementations of the present application, the through holes are arranged along the radial direction of the rotor punching sheet, so that the flow path of the cooling medium is shortest, thereby improving the cooling efficiency.

[0047] It should be noted that the above-mentioned through holes are formed on some of the rotor punchings, which means that the rotor punchings constituting the rotor core 2 can be completely the same punchings or two or more different punchings. When the rotor punchings constituting the rotor core 2 are completely the same, each punching has a through hole, and when the rotor punchings constituting the rotor core 2 include two or more types, at least one rotor punching should have a through hole, so as to form the second channel 21, so as to pass the cooling medium in the rotating shaft 1 into the third channel 22.

[0048] Reference Figure 1 , Figure 2 and Figure 3 , is an implementation method of the motor rotor disclosed in the present application, wherein the rotor punching includes a first punching and a second punching, wherein Figure 2 For the first punch, Figure 3 For the second punch.

[0049] The first punching plate is provided with a plurality of pairs of magnetic steel slot groups along the circumferential direction, each pair of magnetic steel slot groups includes two magnetic steel slots 100, the two magnetic steel slots 100 are arranged in a V shape, and the two magnetic steel slots 100 are connected to each other. When the magnetic steel 3 is installed in the magnetic steel slot 100, an empty area 110 is reserved between the ends of the two magnetic steel slots 100. The first punching plate is provided with a through hole 120, one end of the through hole 120 is connected to the empty area 110, and the other end is connected to the inner wall of the rotor punching plate.

[0050] The second punching sheet is different from the first punching sheet only in that no through hole is provided on the second punching sheet, and the end of the magnetic steel slot 100 of the second punching sheet also has a vacant area 110 .

[0051] like Figure 1 When the rotor core 2 includes the first punching sheet and the second punching sheet, the entire rotor core 2 includes a first core body 200 formed by stacking a plurality of first punching sheets and two second core bodies 210 formed by stacking a plurality of second punching sheets. In the axial direction of the rotating shaft 1, the first core body 200 is located in the middle of the rotating shaft 1, and the two second core bodies 210 are respectively located on both sides of the first core body 200. The vacant areas 110 on the first punching sheet and the second punching sheet are connected to form a third channel 22. After the first punching sheets are stacked to form the first core body 200, the plurality of through holes 120 together form the second channel 21.

[0052] The oil inlet hole 12 of the rotating shaft 1 is opened in the middle part of the rotating shaft 1 and is connected to the second channel 21. It should be noted that, for the first punching sheet, each vacant area 110 is provided with a through hole 120, so that the cooling medium can contact each magnetic steel 3, ensuring that each magnetic steel 3 can be directly cooled. Therefore, accordingly, the corresponding part of the rotating shaft 1 should be provided with the same number of oil inlet holes 12 as the through holes 120 along the circumferential direction.

[0053] In the case of adopting the above method, the second core body 210 does not have the second channel 21, which ensures the strength of the rotor core 2, and the circulation of the cooling medium is realized through the first core body 200. Therefore, by stacking the first punching sheet and the second punching sheet together, the direct contact between the cooling medium and the magnetic steel 3 is achieved to improve the cooling efficiency, and the strength of the entire rotor core 2 can also be ensured to meet the requirements of high-speed working conditions.

[0054] It should be noted that, although in the above exemplary embodiment, the rotor core 2 includes a first core body 200 and a second core body 210 respectively arranged on both sides of the first core body 200, the stacking form of the rotor core 2 is not limited to the above arrangement form. For example, a plurality of first core bodies 200 may also be arranged along the axial direction of the rotating shaft 1, and at the same time, a second core body 210 is arranged between each adjacent two first core bodies 200, that is, the first core body 200 and the second core body 210 are arranged at intervals.

[0055] Furthermore, in order to ensure the strength of the rotor core 2, the outer side of the rotor core 2 is at least partially wrapped with an outer protective layer 4. The outer protective layer 4 can be made of carbon fiber or glass fiber.

[0056] For example, in some implementations, the outer sheath 4 may be wrapped only on the outside of the first core 200, and the outer sheath 4 may be used to offset the centrifugal force during the rotation of the motor rotor, thereby reducing the loss of the first core 200. Of course, in other implementations, the outer sheath 4 may be wrapped entirely on the outside of the rotor core 2, and this application does not limit this.

[0057] Reference Figure 4 In one implementation of the present application, the rotor core 2 can be entirely formed by stacking first punching sheets. At this time, in an axial section of the rotor core 2, the oil inlet hole 12, the second channel 21 and the third channel 22 form a through rectangular plane. After the cooling medium enters the first channel 11, it can flow in any direction around.

[0058] When the above method is adopted, the circulation speed of the cooling medium is faster, so the cooling efficiency is also improved.

[0059] In order to ensure the strength of the rotor core 2, when the above method is adopted, the outer side of the rotor core 2 is completely wrapped with the outer protective layer 4 to create a prestress toward the axis of the rotor core 2 and enhance the ability of the rotor core 2 to resist centrifugal force.

[0060] Reference Figure 5 , Figure 6 and Figure 7 As an implementation method of the present application, the rotor core 2 includes a plurality of third punching sheets. The magnetic steel slots 100 and the vacant areas 110 on the third punching sheets are the same as those on the first punching sheets, and the present application will not elaborate on them here. The third punching sheets are different from the first punching sheets in that the through holes 120 on the third punching sheets are arranged at intervals along the arrangement order of the magnetic steel slot groups or the vacant areas 110.

[0061] A plurality of third punching sheets are stacked to form a plurality of third core bodies 220, and the plurality of third core bodies 220 together form the rotor core 2. It should be noted that, in the axial direction along the rotating shaft 1, the plurality of third core bodies 220 should be staggered and stacked so that the second channels 21 of adjacent third core bodies 220 are not in the same plane. Accordingly, the opening position of the oil inlet hole 12 on the rotating shaft 1 should be set according to the position of the second channel 21 on the rotor core 2.

[0062] In this way, not only the number of through holes 120 on the third punching sheet is reduced, which improves the strength of the third punching sheet compared to the first punching sheet, but also the coolant can enter each third channel 22 along the circumference of the rotor core 2 by staggered stacking of the third core bodies 220, thereby achieving cooling of each magnetic steel 3.

[0063] It should be understood that referring to Figure 6 and Figure 7 Although the present application provides two presentation forms of the second channel 21 in different axial sections of the rotor core 2, it is not limited to this in practical applications. Depending on the number and arrangement of the third core bodies 220, there should be other different presentation forms in different sections.

[0064] In some implementations, the third core body 220 is arranged in such a manner that, along the circumference of the rotor core 2, the second channel 21 is arranged symmetrically with respect to the axis of the rotor core 2, that is, in each direction of the circumference of the rotor core 2, the total flow rate of the second channel 21 is equal, thereby ensuring that the rotor core 2 can be in a dynamically balanced state during the circulation of the cooling medium.

[0065] Furthermore, in order to improve the strength of the rotor core 2 , the outer side of the rotor core 2 may be completely wrapped with an outer protective layer 4 .

[0066] It should be noted that, although the magnetic steel arrangement of the motor rotor in the embodiment of the present application is described using a V-shape as an example, it is not a limitation of the present application. For example, in some other implementations, the magnetic steel arrangement may be a double V-shape, a U-shape, etc. In actual applications, the positional relationship between the through hole 120 and the vacant area 110 can be adaptively adjusted according to the arrangement of the magnetic steel.

[0067] The present application also discloses a motor, which includes the motor rotor in any of the above embodiments.

[0068] The present application also discloses a vehicle, which includes the motor in the above embodiment.

[0069] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A motor rotor, characterized in that: include: A rotating shaft, wherein a first channel is formed inside the rotating shaft, and an oil inlet hole communicating with the first channel is also formed on the rotating shaft; A plurality of rotor punchings, each of which is provided with a plurality of magnetic steel slots along the circumferential direction, and at least some of the rotor punchings are provided with through holes, one end of the through holes being connected to the magnetic steel slots, and the other end being connected to the inner wall of the rotor punching, so that when the plurality of rotor punchings are stacked to form a rotor core and sleeved on the rotating shaft, the through holes together form a second channel; as well as A magnetic steel is disposed in the magnetic steel slot, wherein a third channel along the axial direction of the rotor core is defined between the magnetic steel and the end of the magnetic steel slot; The oil inlet hole is communicated with the second channel, and the second channel is communicated with the third channel, so that the cooling medium can flow through the oil inlet hole, the second channel and the third channel in sequence along the first channel.

2. The motor rotor according to claim 1, characterized in that: The outer peripheral surface of the rotor core is at least partially wrapped with an outer protective layer.

3. The motor rotor according to claim 1, characterized in that: The through holes are arranged along the radial direction of the rotor punching sheet.

4. The motor rotor according to claim 2, characterized in that: The rotor punching sheet comprises a first punching sheet and a second punching sheet, and the through hole is opened on the first punching sheet; In the axial direction of the rotating shaft, a plurality of the first punching sheets are stacked to form a first core body, and a plurality of the second punching sheets are stacked to form two second core bodies. The two second core bodies are respectively located at two sides of the first core body.

5. The motor rotor according to claim 4, characterized in that: The outer peripheral surface of the first core is wrapped with the outer protective layer.

6. The motor rotor according to claim 2, characterized in that: The rotor punching sheet comprises a first punching sheet, and the through hole is opened on the first punching sheet; A plurality of the first punching sheets are stacked to form the rotor core, and the outer peripheral surface of the rotor core is completely wrapped with the outer protective layer.

7. The motor rotor according to claim 2, characterized in that: The rotor punching sheet includes a third punching sheet, and the through holes are arranged at intervals along the arrangement sequence of the magnetic steel slots; A plurality of the third punching sheets are stacked to form a plurality of third cores, and the plurality of the third cores together form the rotor core. The plurality of the third cores are staggered and stacked so that the second channels of adjacent third cores are not in the same plane.

8. The motor rotor according to claim 7, characterized in that: The outer peripheral surface of the rotor core is completely wrapped with the outer protective layer.

9. A motor, characterized in that: A motor rotor comprising the motor rotor according to any one of claims 1 to 8.

10. A vehicle, characterized in that: A motor comprising the motor described in claim 9.

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