Rotor, asynchronous motor and vehicle

Abstract

The application provides a rotor, an asynchronous motor and a vehicle, and relates to the technical field of motor cooling, which comprises a rotating shaft, two end rings, an iron core and a sealing cover; the iron core and the two end rings are sleeved outside the rotating shaft, the sealing cover is sleeved outside the rotating shaft and is located on the side, away from the iron core, of at least one end ring, and the sealing cover, the iron core, the rotating shaft and the corresponding end ring enclose a sealed cooling cavity; the sealing cover is provided with an oil outlet hole in communication with the sealed cooling cavity, the rotating shaft is provided with an oil inlet channel in the axial direction thereof, and the outer peripheral wall of the rotating shaft is provided with a through hole in communication with the oil inlet channel and the sealed cooling cavity, so that the cooling oil flowing into the oil inlet channel can flow into the sealed cooling cavity through the through hole to cool the end ring and be thrown out from the oil outlet hole. The application can immerse the end ring in the cooling oil to realize oil soaking cooling of the end ring, increase the contact area of the end ring and the cooling oil, and improve the cooling effect.

Description

Technical Field

[0001] This invention relates to the field of motor cooling technology, and more specifically, to a rotor, an asynchronous motor, and a vehicle. Background Technology

[0002] An asynchronous motor, also known as an induction motor, is an AC motor that converts electrical energy into mechanical energy by generating electromagnetic torque through the interaction of a rotating magnetic field in the air gap and the induced current in the rotor windings. The rotor of an asynchronous motor includes a shaft, an iron core, conductor bars, and end rings. The iron core (made of stacked silicon steel sheets) is fitted onto the shaft and fixed with an interference fit. Multiple slots are spaced circumferentially on the outer circumference of the iron core, and multiple conductor bars are embedded in these slots, with their ends extending beyond the ends of the iron core. Two end rings are fitted onto the shaft and located at the ends of the iron core, respectively, and are fixed to the two conductor bars. The end rings are made of aluminum or copper. During operation, the end rings generate induced current, and due to their internal resistance, they produce considerable heat, causing their temperature to rise and affecting their performance. Therefore, cooling is necessary to lower the temperature of the end rings.

[0003] In related technologies, the cooling method for the end ring is as follows: a radial through-hole is provided on the end ring, cooling oil enters the shaft and flows from the hole on the shaft's peripheral wall to the radial through-hole, and then is thrown out from the radial through-hole. In this method, the contact area between the end ring and the cooling oil is small, resulting in poor cooling effect of the end ring. Summary of the Invention

[0004] The problem solved by this invention is that the cooling effect of the end ring of the motor rotor is poor.

[0005] To address the above problems, the present invention provides a rotor, an asynchronous motor, and a vehicle.

[0006] In a first aspect, the present invention provides a rotor, comprising: a rotating shaft, two end rings, an iron core, and a sealing cover; the iron core and the two end rings are both sleeved on the rotating shaft, the iron core is fixedly connected to the rotating shaft, and the two end rings are respectively disposed at both axial ends of the iron core and respectively fixedly connected to the iron core; the sealing cover is sleeved on the rotating shaft and located on the side of at least one end ring away from the iron core, and the sealing cover, the iron core, the rotating shaft, and the corresponding end rings together form a sealed cooling cavity; the sealing cover is provided with an oil outlet hole communicating with the sealed cooling cavity, the rotating shaft is provided with an oil inlet channel along its axial direction, and the outer peripheral wall of the rotating shaft is provided with a through hole, the through hole communicating with the oil inlet channel and the sealed cooling cavity, so that the cooling oil flowing into the oil inlet channel can flow into the sealed cooling cavity through the through hole to cool the end rings, and be thrown out from the oil outlet hole.

[0007] Optionally, along the radial direction of the rotating shaft, the oil outlet is located at one end of the sealing cap near the rotating shaft.

[0008] Optionally, a heat dissipation protrusion is provided on the inner peripheral wall of the end ring disposed adjacent to the sealing cover; the heat dissipation protrusion is located in the sealed cooling cavity.

[0009] Optionally, the sealing cap is located within the area enclosed by the end ring.

[0010] Optionally, the sealing cap abuts against the inner peripheral wall of the end ring; And / or, the sealing cover abuts against the outer peripheral wall of the rotating shaft.

[0011] Optionally, the cover body is an annular sheet structure; the first connecting portion is an annular sleeve structure extending obliquely from the outer ring of the cover body in a direction away from the axis of rotation; the end of the first connecting portion away from the cover body abuts against the inner peripheral wall of the end ring; along the axial direction of the rotation shaft, the end of the first connecting portion near the cover body is located between the iron core and the other end of the first connecting portion; the second connecting portion is an annular sleeve structure extending from the inner ring of the cover body in a direction perpendicular to the cover body; the second connecting portion is sleeved on the outside of the rotation shaft and abuts against the rotation shaft.

[0012] Optionally, the number of oil outlet holes is multiple; the multiple oil outlet holes are arranged at intervals along the circumference of the iron core; And / or, two sealing caps are provided, and the two sealing caps are respectively provided corresponding to the two end rings.

[0013] Optionally, the number of heat dissipation protrusions is multiple; the multiple heat dissipation protrusions are arranged at intervals along the circumference of the end ring.

[0014] Secondly, the present invention also provides an asynchronous motor, including the rotor as described above.

[0015] Thirdly, the present invention also provides a vehicle including the asynchronous motor described above.

[0016] The beneficial effects of the rotor of the present invention are: By setting a sealing cover on the side of at least one end ring away from the iron core, and enclosing the sealing cover, iron core, shaft, and corresponding end ring to form a sealed cooling cavity, and setting an oil outlet hole on the sealing cover that communicates with the sealed cooling cavity, the cooling oil flowing into the oil inlet channel can flow into the sealed cooling cavity through the through hole to cool the end ring, and then be thrown out from the oil outlet hole. In this way, the end ring can be immersed in the cooling oil, realizing oil-immersion cooling of the end ring, increasing the contact area between the end ring and the cooling oil, and improving the cooling effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the rotor structure provided in an embodiment of the present invention; Figure 2 This is another schematic diagram of the rotor provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the sealing cap provided in an embodiment of the present invention; Figure 4 for Figure 3 The cross-sectional view of the sealing cap shown; Figure 5 This is a schematic diagram of the end ring structure provided in an embodiment of the present invention; Figure 6 for Figure 1 The cross-sectional view of the rotor shown; Figure 7 for Figure 6 A partially enlarged view of the rotor shown.

[0018] Explanation of reference numerals in the attached figures: 1. Shaft; 2. Iron core; 3. End ring; 4. Sealing cover; 41. First connecting part; 42. Cover body; 43. Second connecting part; 5. Oil outlet hole; 6. Sealed cooling cavity; 7. Oil inlet channel; 8. Through hole; 9. Heat dissipation protrusion. Detailed Implementation

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

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

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

[0022] like Figures 1 to 7 As shown, in a first aspect, an embodiment of the present invention provides a rotor, comprising: a rotating shaft 1, two end rings 3, an iron core 2, and a sealing cover 4; the iron core 2 and the two end rings 3 are both sleeved on the rotating shaft 1, the iron core 2 is fixedly connected to the rotating shaft 1, and the two end rings 3 are respectively disposed at both ends of the axial direction of the iron core 2 and are respectively fixedly connected to the iron core 2; the sealing cover 4 is sleeved on the rotating shaft 1 and is located on the side of at least one end ring 3 away from the iron core 2, and the sealing cover 4, the iron core 2, the rotating shaft 1, and the corresponding end ring 3 together form a sealed cooling cavity 6; the sealing cover 4 is provided with an oil outlet hole 5 communicating with the sealed cooling cavity 6, the rotating shaft 1 is provided with an oil inlet channel 7 along its axial direction, and the outer peripheral wall of the rotating shaft 1 is provided with a through hole 8, the through hole 8 communicating with the oil inlet channel 7 and the sealed cooling cavity 6, so that the cooling oil flowing into the oil inlet channel 7 can flow into the sealed cooling cavity 6 through the through hole 8 to cool the end rings 3, and be thrown out from the oil outlet hole 5.

[0023] Specifically, during use, the shaft 1, iron core 2, end ring 3, and sealing cover 4 all rotate. Cooling oil enters the oil inlet channel 7 on the shaft 1 and then flows into the sealed cooling chamber 6 through the through hole 8. Because the shaft 1, end ring 3, and sealing cover 4 all rotate, the cooling oil in the sealed cooling chamber 6 is thrown away from the axis of the shaft 1. That is, the cooling oil entering the sealed cooling chamber 6 first accumulates on the side of the sealing cover 4 away from the shaft 1. As cooling oil continues to enter the sealed cooling chamber 6, the amount of cooling oil in the chamber gradually increases and gradually approaches the oil outlet 5. At this time, the circumference of the end ring 3 is in contact with the cooling oil, and the end ring 3 is immersed in the cooling oil, achieving oil-immersion cooling of the end ring 3. When the amount of cooling oil in the sealed cooling chamber 6 increases to the point that it contacts the oil outlet 5 on the sealing cover 4, the cooling oil in the chamber is thrown out from the oil outlet 5. The sealing cover 4 can be located on the side of the end ring 3 away from the iron core 2, or it can be located within the area enclosed by the end ring 3.

[0024] Along the radial direction of the rotating shaft 1, the oil outlet 5 can be located in the middle of the sealing cover 4, or at one end of the sealing cover 4 near the rotating shaft 1, or at any position between the middle and the end near the rotating shaft 1.

[0025] In this embodiment, a sealing cover 4 is provided on the side of at least one end ring 3 away from the iron core 2, and the sealing cover 4, iron core 2, rotating shaft 1 and corresponding end ring 3 are enclosed to form a sealed cooling cavity 6. An oil outlet hole 5 communicating with the sealed cooling cavity 6 is provided on the sealing cover 4, so that the cooling oil flowing into the oil inlet channel 7 can flow into the sealed cooling cavity 6 through the through hole 8 to cool the end ring 3, and be thrown out from the oil outlet hole 5. In this way, the end ring 3 can be immersed in the cooling oil, realizing oil-immersion cooling of the end ring 3, increasing the contact area between the end ring 3 and the cooling oil, and improving the cooling effect.

[0026] Optionally, along the radial direction of the rotating shaft 1, the oil outlet 5 is located at one end of the sealing cover 4 near the rotating shaft 1.

[0027] In this optional embodiment, the oil outlet 5 is located at one end near the rotating shaft 1, which can increase the volume of cooling oil accumulated in the sealed cooling cavity 6, further increase the contact area between the cooling oil and the end ring 1, and improve the cooling effect.

[0028] like Figure 5 As shown, optionally, a heat dissipation protrusion 9 is provided on the inner peripheral wall of the end ring 3 (i.e., the inner ring of the end ring 3) which is disposed adjacent to the sealing cover 4; the heat dissipation protrusion 9 is located inside the sealed cooling cavity 6.

[0029] Specifically, the heat dissipation protrusion 9 is made of aluminum or copper. The heat dissipation protrusion 9 can be integrally formed with the end ring 3. The structure of the heat dissipation protrusion 9 can be a bump, a block, a pillar, etc., all of which are within the protection scope of this invention.

[0030] In this optional embodiment, the heat dissipation protrusion 9 is located inside the sealed cooling cavity 6. The heat of the end ring 3 is transferred to the heat dissipation protrusion 9. After the heat dissipation protrusion 9 comes into contact with the cooling oil, the heat is absorbed by the cooling oil, thereby dissipating heat from the end ring 3. The heat dissipation protrusion 9 increases the contact area with the cooling oil, further improving the cooling effect of the end ring 3.

[0031] like Figure 6 and Figure 7 As shown, optionally, the sealing cap 4 is located within the area enclosed by the end ring 3.

[0032] In this optional embodiment, the sealing cover 4 is located in the area enclosed by the end ring 3. The sealing cover 4, the inner peripheral wall of the end ring 3, the iron core 2 and the rotating shaft 1 form a sealed cooling cavity 6. This arrangement can facilitate the installation of the sealing cover 4 without changing the existing end ring 3 structure, thereby realizing the formation of the sealed cooling cavity 6, while avoiding the sealing cover 4 occupying the space of the motor.

[0033] Optionally, the sealing cover 4 abuts against the inner peripheral wall of the end ring 3. And / or, the sealing cover 4 abuts against the outer peripheral wall of the rotating shaft 1.

[0034] That is, the sealing cover 4 abuts against the inner circumferential wall of the end ring 3 to achieve the installation and fixation of the sealing cover 4. Alternatively, the sealing cover 4 abuts against the outer circumferential wall of the rotating shaft 1 to achieve the installation and fixation of the sealing cover 4. Alternatively, the sealing cover 4 abuts against both the inner circumferential wall of the end ring 3 and the outer circumferential wall of the rotating shaft 1 to achieve the installation and fixation of the sealing cover 4.

[0035] In this optional embodiment, the sealing cap 4 abuts against the end ring 3, facilitating both to be fixed and to seal the connection between them. Similarly, the sealing cap 4 abuts against the rotating shaft 1, facilitating both to be fixed and to seal the connection between them.

[0036] like Figure 3 and Figure 4 As shown, optionally, the sealing cap 4 includes a first connecting portion 41, a cap body 42, and a second connecting portion 43; the cap body 42 is an annular sheet structure; the first connecting portion 41 is an annular sleeve structure that extends obliquely from the outer ring of the cap body 42 in a direction away from the axis of the rotating shaft 1; one end of the first connecting portion 41 away from the cap body 42 abuts against the inner peripheral wall of the end ring 3; along the axial direction of the rotating shaft 1, one end of the first connecting portion 41 near the cap body 42 is located between the iron core 2 and the other end of the first connecting portion 41; the second connecting portion 43 is an annular sleeve structure that extends from the inner ring of the cap body 42 in a direction perpendicular to the cap body 42; the second connecting portion 43 is sleeved on the outside of the rotating shaft 1 and abuts against the rotating shaft 1.

[0037] Specifically, the second connecting part 43 is interference-fitted with the rotating shaft 1. Preferably, one end of the second connecting part 43 is fixedly connected to the cover body 42, and the other end is located outside the sealed cooling cavity 6. In this way, the second connecting part 43 does not occupy the space of the sealed cooling cavity 6.

[0038] The first connecting part 41 is an annular sleeve structure that extends obliquely from the outer ring of the cover body 42 away from the axis of the rotating shaft 1; the end of the first connecting part 41 away from the cover body 42 abuts against the inner peripheral wall of the end ring 3; along the axial direction of the rotating shaft 1, the end of the first connecting part 41 closer to the cover body 42 is located between the iron core 2 and the other end of the first connecting part 41. That is, the end of the first connecting part 41 with a larger diameter abuts against the inner peripheral wall of the end ring 3, and the end with a smaller diameter is connected to the outer ring of the cover body 42.

[0039] In this optional embodiment, the sealing cover 4 includes a first connecting portion 41, a cover body 42, and a second connecting portion 43. The first connecting portion 41 has an inclined structure, with its larger diameter end abutting against the end ring 3. When installing the sealing cover 4, the second connecting portion 43 is fitted onto the rotating shaft 1 and then moved towards the iron core 2, so that the smaller diameter end of the first connecting portion 41 enters the end ring 3 first. As the sealing cover 4 moves, the larger diameter end of the first connecting portion 41 gradually contacts the end ring 3 and abuts against the inner circumferential wall of the end ring 3, thereby firmly fixing the sealing cover 4. The inclined structure of the first connecting portion 41 facilitates the smooth entry of the sealing cover 4 into the end ring 3, making installation convenient, and at the same time, it allows the sealing cover 4 to abut tightly against the end ring 3, improving the sealing performance.

[0040] Optionally, there are multiple oil outlet holes 5; the multiple oil outlet holes 5 are arranged at intervals along the circumference of the iron core 2.

[0041] In this optional embodiment, multiple oil outlet holes 5 are spaced apart along the circumference of the iron core 2. When the cooling oil in the sealed cooling cavity 6 covers the oil outlet holes 5, it is thrown out from the multiple oil outlet holes 5, which can discharge the heated cooling oil in time and quickly, so that the cooling oil in the oil inlet channel 7 enters new cooling oil through the through hole 8, ensuring that the temperature of the cooling oil in the sealed cooling cavity 6 will never be too high, and further improving the cooling effect of the end ring 3.

[0042] Optionally, the oil outlet 5 is a strip-shaped hole that bends circumferentially along the iron core 2. The strip-shaped hole increases the area of ​​the oil outlet 5, allowing the heated cooling oil to be discharged quickly. The strip-shaped hole bends circumferentially along the iron core 2, so that its entire length is close to the inner ring side of the sealing cover 4, increasing the volume of cooling oil accumulated or stored in the sealed cooling cavity 6, so that the end ring 3 can be fully cooled down.

[0043] Optionally, two sealing caps 4 are provided; the two sealing caps 4 are respectively provided corresponding to the two end rings 3.

[0044] In this optional embodiment, the two sealing caps 4 and the two end rings 3 respectively form two sealed cooling cavities 6. The rotating shaft 1 is provided with through holes 8 at positions corresponding to the two sealed cooling cavities 6, so that the cooling oil in the oil inlet channel 7 can enter the two sealed cooling cavities 6 to cool the two end rings 3, which is convenient for use.

[0045] like Figure 5 As shown, optionally, there are multiple heat dissipation protrusions 9; the multiple heat dissipation protrusions 9 are arranged at intervals along the circumference of the end ring 3.

[0046] In this optional embodiment, multiple heat dissipation protrusions 9 are spaced apart circumferentially along the end ring 3, which can further increase the contact area with the cooling oil, increase the heat dissipation area, and thus further improve the cooling effect.

[0047] Optionally, there are multiple through holes 8, which are spaced apart circumferentially along the shaft 1. Multiple through holes 8 can increase the speed at which cooling oil enters the sealed cooling chamber 6, allowing the sealed cooling chamber 6 to be filled quickly, thereby rapidly cooling the end ring 3.

[0048] Secondly, embodiments of the present invention also provide an asynchronous motor, which includes the rotor as described above.

[0049] The advantages of the asynchronous motor in this embodiment over the prior art are the same as those of the rotor described above, and will not be repeated here.

[0050] Thirdly, embodiments of the present invention also provide a vehicle that includes the asynchronous motor described above.

[0051] The advantages of the vehicle in this embodiment over the prior art are the same as those of the rotor described above, and will not be repeated here.

[0052] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A rotor, characterized in that, include: Shaft (1), two end rings (3), iron core (2), sealing cover (4); The iron core (2) and the two end rings (3) are both sleeved on the outside of the rotating shaft (1). The iron core (2) is fixedly connected to the rotating shaft (1). The two end rings (3) are respectively located at the two ends of the axial direction of the iron core (2) and are fixedly connected to the iron core (2). The sealing cover (4) is sleeved on the outside of the rotating shaft (1) and located on the side of at least one end ring (3) away from the iron core (2), and the sealing cover (4), the iron core (2), the rotating shaft (1) and the corresponding end ring (3) together form a sealed cooling cavity (6). The sealing cover (4) is provided with an oil outlet (5) that communicates with the sealed cooling cavity (6). The rotating shaft (1) is provided with an oil inlet channel (7) along its axial direction. The outer peripheral wall of the rotating shaft (1) is provided with a through hole (8). The through hole (8) connects the oil inlet channel (7) and the sealed cooling cavity (6), so that the cooling oil flowing into the oil inlet channel (7) can flow into the sealed cooling cavity (6) through the through hole (8) to cool the end ring (3) and be thrown out from the oil outlet (5).

2. The rotor according to claim 1, characterized in that, Along the radial direction of the rotating shaft (1), the oil outlet (5) is located at one end of the sealing cover (4) near the rotating shaft (1).

3. The rotor according to claim 1, characterized in that, The end ring (3) adjacent to the sealing cover (4) has a heat dissipation protrusion (9) on its inner peripheral wall; the heat dissipation protrusion (9) is located inside the sealed cooling cavity (6).

4. The rotor according to claim 1, characterized in that, The sealing cap (4) is located within the area enclosed by the end ring (3).

5. The rotor according to claim 4, characterized in that, The sealing cap (4) abuts against the inner peripheral wall of the end ring (3); And / or, the sealing cover (4) abuts against the outer peripheral wall of the rotating shaft (1).

6. The rotor according to claim 5, characterized in that, The sealing cap (4) includes a first connecting part (41), a cap body (42), and a second connecting part (43); The cover body (42) is an annular sheet structure; the first connecting part (41) is an annular sleeve structure that extends obliquely from the outer ring of the cover body (42) toward the axis away from the rotating shaft (1); the end of the first connecting part (41) away from the cover body (42) abuts against the inner peripheral wall of the end ring (3); along the axial direction of the rotating shaft (1), the end of the first connecting part (41) near the cover body (42) is located between the iron core (2) and the other end of the first connecting part (41); The second connecting part (43) is an annular sleeve structure extending from the inner ring of the cover body (42) in a direction perpendicular to the cover body (42); the second connecting part (43) is sleeved on the rotating shaft (1) and abuts against the rotating shaft (1).

7. The rotor according to claim 1, characterized in that, The number of oil outlet holes (5) is multiple; the multiple oil outlet holes (5) are arranged at intervals along the circumference of the iron core (2); And / or, two sealing caps (4) are provided, and the two sealing caps (4) are respectively provided corresponding to the two end rings (3).

8. The rotor according to claim 3, characterized in that, The number of heat dissipation protrusions (9) is multiple; the multiple heat dissipation protrusions (9) are arranged at circumferential intervals along the end ring (3).

9. An asynchronous motor, characterized in that, Includes the rotor as described in any one of claims 1 to 8.

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

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