Oil-cooled motor stator and oil-cooled motor

Abstract

The utility model discloses an oil-cooled motor stator, which comprises a stator iron core, a winding arranged in the stator iron core in a penetrating manner, a middle iron core of the stator iron core and end iron cores coaxially arranged at two ends of the middle iron core, the middle iron core comprises a plurality of first stator laminations which are stacked in the axial direction, two or more oil injection holes are formed in yoke parts of the first stator laminations in the circumferential direction, the adjacent first stator laminations are rotationally staggered in the circumferential direction, the middle iron core comprises a plurality of second stator laminations which are stacked in the axial direction, the adjacent second stator laminations are rotationally staggered in the circumferential direction, oil inlets are formed in the peripheries of the second stator laminations, and the oil inlets are communicated with the oil injection holes. The yoke part of the second stator lamination is provided with a plurality of through holes along the circumferential direction. According to the scheme, uniform flow velocity of cooling oil among different oil ducts can be ensured, uniform heat dissipation is further ensured, cooling oil at the bottom and sprayed out of a winding can be collected, multiple functions of bottom soaking, directional cooling of a high-temperature area at the bottom and the like are achieved, and the utilization rate of the cooling oil is increased.

Description

Technical Field

[0001] This utility model relates to the field of motor cooling, and in particular to an oil-cooled motor stator and an oil-cooled motor. Background Technology

[0002] The biggest challenge facing lightweight drive motors is improving their heat dissipation capacity to quickly remove the heat generated during operation, enabling the motor to run normally for extended periods. Since cooling oil can directly contact the heat sources inside the drive motor, it offers high heat dissipation efficiency and has largely replaced water-cooled drive motors. However, because oil-cooled drive motors dissipate heat through direct contact with the cooling oil, areas that don't contact the oil or have limited contact with it tend to have higher temperatures, affecting motor performance. Therefore, a crucial issue to address in oil-cooled drive motors is improving the evenness of their heat dissipation.

[0003] Most existing drive motor oil-cooling structures, such as the stator core and oil-cooled motor with staggered oil supply disclosed in the utility model patent with authorization announcement number CN218958643U, have a first oil groove around the outer periphery of the stator core for oil inlet, and a second and third oil groove along the axial direction in the middle of the stator core, thereby forming a cooling oil channel. However, this type of solution has the following drawbacks: 1. The inlet pressure of the first oil groove near the oil inlet is relatively high. At this point, the cooling oil sprays a long distance from both ends of the stator core, bypassing the end windings and spraying directly onto the outer ends of the windings, failing to directly cool the windings. 2. Due to gravity, the cooling oil flows rapidly along the annular first oil groove to the bottom of the core and flows out from both ends of the cooling oil channels at the bottom. Therefore, most of the cooling oil does not contact the end windings during its outward flow, resulting in uneven heat dissipation. 3. Since most of the cooling oil flows away from the top and bottom of the stator core, the oil volume in the middle oil groove of the stator core is insufficient, resulting in a very slow flow rate of cooling oil in the middle oil groove of the stator core. There is insufficient pressure to spray the oil onto the end windings, and this portion of cooling oil also fails to provide good heat dissipation. Therefore, this type of oil-cooled structure still suffers from uneven heat dissipation. Utility Model Content

[0004] Therefore, in order to solve the above problems, this utility model provides an oil-cooled motor stator and an oil-cooled motor.

[0005] The utility model is realized through the following technical solutions:

[0006] An oil-cooled motor stator includes a stator core and windings passing through the stator core. The stator core includes a central core and end cores coaxially disposed at both ends of the central core. Each end core includes a plurality of first stator laminations stacked axially. The yoke of each first stator lamination has two or more types of oil injection holes arranged circumferentially. The radial distance between the different types of oil injection holes and the outer periphery of the first stator laminations is different. Adjacent first stator laminations are rotated and staggered circumferentially, causing the oil injection holes to interweave and connect axially, collectively forming a first cooling oil channel. The central core includes multiple second stator laminations stacked axially. Adjacent second stator laminations are arranged in a circumferentially staggered manner. Each second stator lamination has an oil inlet on its outer periphery. The multiple oil inlets are interconnected axially to form an oil inlet channel. The yoke of the second stator lamination has multiple through holes circumferentially. The multiple through holes are interconnected axially to form a second cooling oil channel inside the central core. The two ends of the oil inlet channel are connected to the second cooling oil channel. The second cooling oil channel is connected to the first cooling oil channel located at its two ends.

[0007] Preferably, the yoke portion of the first stator lamination is provided with a first oil injection hole, a second oil injection hole, and a third oil injection hole along its circumference. The radial distance between the first oil injection hole and the outer periphery of the first stator lamination is greater than the radial distance between the second oil injection hole and the outer periphery of the first stator lamination, and the radial distance between the second oil injection hole and the outer periphery of the first stator lamination is greater than the radial distance between the third oil injection hole and the outer periphery of the first stator lamination.

[0008] Preferably, the number of the first, second, and third oil injection holes is the same, and the first, second, and third oil injection holes are arranged at equal angles on the yoke of the first stator lamination, with a rotational misalignment angle of 120° between two adjacent first stator laminations.

[0009] Preferably, the first injection hole is a T-shaped hole, and the second and third injection holes are circular and / or elliptical and / or waist-shaped injection holes.

[0010] Preferably, the central core includes a second stator lamination arranged at a first circumferential angle and a second stator lamination arranged at a second circumferential angle, wherein the second stator laminations arranged at the first angle and the second stator laminations arranged at the second angle are staggered and superimposed, and each through hole on the second stator lamination is connected to two through holes on its adjacent second stator lamination, forming a second cooling oil channel in the central core.

[0011] Preferably, the yoke portion of the second stator lamination is provided with a plurality of through holes of the same shape at equal angles along its circumference.

[0012] Preferably, the stator core and the outer periphery of the winding are provided with a housing, and oil guide rings are provided at both ends of the housing. The oil guide ring includes an end cover, a limiting inner ring provided on the inner periphery of the end cover, and a limiting outer ring provided on the outer periphery of the end cover. The limiting inner ring is provided on the inner periphery of the winding, and the limiting outer ring is provided on the outer periphery of the winding.

[0013] Preferably, the bottom opening of the inner limiting ring and the two sides of the outer limiting ring are provided with drainage ports, the height of which is between the bottom of the outer limiting ring and the opening height of the inner limiting ring.

[0014] Oil-cooled motor, including the oil-cooled motor stator as described above.

[0015] The beneficial effects of this utility model's technical solution are mainly reflected in:

[0016] 1. In this design, multiple oil inlets are interconnected along the axial direction to form axially distributed oil inlet channels. Combined with the grid-like distribution of the second cooling oil channels formed by the interconnected through holes arranged circumferentially along the central iron core, the second cooling oil channels inside the central iron core are more evenly distributed than the oil channels arranged in a straight line along the axial direction, which can improve the heat dissipation effect and ensure that the cooling oil flow rate between different oil channels is uniform, thereby ensuring uniform heat dissipation and reducing the high temperature points of the stator iron core. On the other hand, the grid-like distribution of the second cooling oil channels is interconnected, so there will be no problem of insufficient oil in some second cooling oil channels.

[0017] 2. In this scheme, the yoke of the first stator lamination has two or more types of oil injection holes arranged circumferentially. On the one hand, the radial distance between the different types of oil injection holes and the outer periphery of the first stator lamination is different. The distance between the oil injection hole outlet position and the winding can be set according to the cooling oil injection pressure of different parts of the motor and the high temperature area. On the other hand, the oil injection holes are staggered and connected axially, which can increase the cooling oil contact area of ​​the first cooling oil channel in the end core and improve the heat dissipation effect.

[0018] 3. In a preferred embodiment, by providing oil guide rings at both ends of the stator core and windings, the oil guide rings simultaneously have multiple functions such as collecting cooling oil from the bottom and spraying outwards from the windings, using gravity to achieve bottom immersion, and using the drain port to directionally cool the high-temperature area at the bottom, thereby improving the utilization rate of cooling oil.

[0019] 4. In the stator core structure, only two different types of stator laminations are used to rotate and stack to form uniformly arranged and diverse cooling oil channels, which improves the cooling effect and simplifies the stator core manufacturing process. Attached Figure Description

[0020] Figure 1 This is a 3D view of the stator of an oil-cooled motor;

[0021] Figure 2 This is a 3D view of the stator of an oil-cooled motor after the housing has been removed.

[0022] Figure 3 This is a top view of the first stator lamination;

[0023] Figure 4 This is a partial exploded view of the stator of an oil-cooled motor (the casing is omitted here).

[0024] Figure 5 This is a cross-sectional view of the stator of an oil-cooled motor;

[0025] Figure 6 yes Figure 5 Enlarged view of part A;

[0026] Figure 7 This is a schematic diagram showing the connection status between the central iron core and the winding;

[0027] Figure 8 This is a schematic diagram showing the working state of the oil guide ring collecting cooling oil flowing down under gravity;

[0028] Figure 9 This is a schematic diagram showing the working state of the oil guide ring collecting the cooling oil sprayed onto the outside of the winding. Detailed Implementation

[0029] To make the objectives, advantages, and features of this utility model clearer and more detailed, the following non-limiting description of preferred embodiments will be illustrated and explained. These embodiments are merely typical examples of applying the technical solutions of this utility model; any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this utility model.

[0030] It should also be stated that, in the description of the solution, the terms "center", "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, the terms "first" and "second" in this solution are used for descriptive purposes only and should not be construed as indicating or implying a ranking of importance, or implicitly specifying the number of technical features shown. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0032] This utility model discloses an oil-cooled motor stator, such as Figures 2-5 As shown, the device includes a stator core and windings 6 passing through the stator core, a central stator core, and end stators coaxially disposed at both ends of the central stator core. The end stators include multiple first stator laminations 1 stacked axially. The yoke of each first stator lamination 1 has two or more types of oil injection holes 2 arranged circumferentially. The radial distance between the different types of oil injection holes 2 and the outer periphery of the first stator laminations 1 is different. Adjacent first stator laminations 1 are rotated and misaligned circumferentially, causing the oil injection holes 2 to interweave axially and overlap to form a first cooling oil channel. Figure 5 , Figure 6 As shown, the oil injection holes 2 on adjacent first stator laminations 1 are staggered.

[0033] like Figure 3 As shown, in some embodiments, the yoke portion of the first stator lamination 1 is provided with a first oil injection hole 201, a second oil injection hole 202, and a third oil injection hole 203 along its circumference. The radial distance between the first oil injection hole 201 and the outer periphery of the first stator lamination 1 is greater than the radial distance between the second oil injection hole 202 and the outer periphery of the first stator lamination 1, and the radial distance between the second oil injection hole 202 and the outer periphery of the first stator lamination 1 is greater than the radial distance between the third oil injection hole 203 and the outer periphery of the first stator lamination 1.

[0034] In a preferred embodiment, such as Figure 6 As shown, among the set of oil spray holes 2 located at the top, the oil spray hole 2 closer to the outer end of the stator core has a larger radial distance from the outer periphery of the first stator lamination 1 and a closer distance to the winding 6 passing through the first stator lamination 1. Therefore, when the cooling oil in the oil spray hole 2 is sprayed out, the spray distance is significantly shortened, thereby avoiding the cooling oil from being sprayed to the outer end of the winding 6 and causing the winding 6 to not be cooled.

[0035] like Figure 3 As shown, in one embodiment, the number of the first oil injection hole 201, the second oil injection hole 202, and the third oil injection hole 203 are the same, and the first oil injection hole 201, the second oil injection hole 202, and the third oil injection hole 203 are arranged at equal angles on the yoke of the first stator lamination 1. The rotational misalignment angle between two adjacent first stator laminations 1 is 120°, so that different types of oil injection holes 2 are alternately superimposed. When each end core includes three first stator laminations 1, each first cooling oil channel of the end core is formed by the first oil injection hole 201, the second oil injection hole 202, and the third oil injection hole 203 superimposed axially. At the same time, it should be ensured that the first oil injection hole 201, the second oil injection hole 202, and the third oil injection hole 203 in the first cooling oil channel are connected to ensure that the cooling oil is not blocked.

[0036] like Figure 3As shown, in one embodiment, the first injection hole 201 is a T-shaped hole, wherein the T-shaped hole has a larger internal space than a normal circular hole, which can increase the contact area with the cooling oil. The second injection hole 202 and the third injection hole 203 are circular and / or elliptical and / or waist-shaped injection holes 2. In another embodiment, the first injection hole 201, the second injection hole 202 and the third injection hole 203 can all be T-shaped holes / circular holes / elliptical holes / waist-shaped injection holes 2. In other embodiments, the first injection hole 201, the second injection hole 202 and the third injection hole 203 can also adopt other shapes, which will not be described in detail here.

[0037] like Figure 2 , Figures 4-7 As shown, the central core includes multiple axially stacked second stator laminations 3, with adjacent second stator laminations 3 arranged in a circumferentially offset manner. Each second stator lamination 3 has an oil inlet 4 on its outer periphery, and these inlets 4 are interconnected axially to form an oil inlet channel. The yoke of each second stator lamination 3 has multiple through holes 5 circumferentially, which are also interconnected axially, forming a grid-like second cooling oil channel within the central core, allowing adjacent second cooling oil channels to connect sequentially. The oil inlet channel is axially positioned on the outer periphery of the central core, and both ends of the oil inlet channel communicate with the second cooling oil channel. Even if the oil inlet channel is located at the top of the central core, the cooling oil must gradually flow to the bottom through the grid-like second cooling oil channel, rather than flowing directly and rapidly to the bottom of the central core. Similarly, when the oil inlet channel is located at the bottom of the central core, the cooling oil also needs to gradually flow to the second cooling oil channel at the top through the second cooling oil channel at the bottom.

[0038] The second cooling oil passage is connected to the first cooling oil passage located at both ends, so that the cooling oil in each second cooling oil passage is input into the first cooling oil passage from both ends, and finally sprayed out from the oil spray holes 2 at both ends of the stator core.

[0039] like Figure 2 , Figure 4 As shown, in some embodiments, the central iron core includes second stator laminations 3 arranged at a first circumferential angle and second stator laminations 3 arranged at a second circumferential angle, wherein the second stator laminations 3 arranged at the first angle and the second stator laminations 3 arranged at the second angle are staggered and stacked, forming an axially arranged oil inlet channel on the outer periphery of the central iron core. At the same time, each through hole 5 on the second stator lamination 3 communicates with two through holes 5 on its adjacent second stator lamination 3, thereby forming a grid-like second cooling oil channel in the central iron core.

[0040] like Figure 7As shown, in a preferred embodiment, the yoke of the second stator lamination 3 is provided with a plurality of through holes 5 of the same shape at equal angles along its circumference.

[0041] like Figure 1 , Figure 5 , Figure 6 As shown, in some embodiments, a housing 8 is provided around the stator core and winding 6. In some embodiments, the housing is cylindrical. An oil inlet 801 for connecting to an external oil supply channel is provided around the housing 8. The oil inlet 801 is located on one side of the oil inlet channel, allowing it to communicate with the oil inlet channel. Oil guide rings 7 are also provided at both ends of the housing 8. Each oil guide ring 7 includes an end cap 703, a limiting inner ring 701 located within the end cap 703, and a limiting outer ring 702 located outside the end cap 703. The limiting inner ring 701 is located within the winding 6, and the limiting outer ring 702 is located outside the winding 6, such that the end of the winding 6 is located between the limiting inner ring 701 and the limiting outer ring 702. Figure 9 As shown, when cooling oil is sprayed onto the outer end of winding 6, the cooling oil is blocked by the end cap 703 of the oil guide ring 7, causing the cooling oil splashed onto the inner wall of the oil guide ring 7 to flow back to winding 6; in addition, as Figure 8 As shown, the cooling oil after passing through the winding 6 will also be collected by the limiting inner ring 701 of the oil guide ring 7 due to gravity, and will be further cooled after being guided by the limiting inner ring, thereby improving the utilization rate of the cooling oil.

[0042] like Figure 1 , Figure 2 , Figure 4 As shown, in some embodiments, the bottom of the limiting inner ring 701 is open, so that the used cooling oil is collected at the bottom of the oil guide ring 7; wherein, there are local high temperature points on both sides of the bottom of the stator, and the two sides of the limiting outer ring 702 are also provided with drain ports, the height of the drain ports is located between the bottom of the limiting outer ring 702 and the opening height of the limiting inner ring 701, and the drain ports are preferably located at a height close to the high temperature points, thereby ensuring that the cooling oil collected at the bottom of the oil guide ring 7 is directionally transported to the high temperature points through the drain ports, further improving the heat dissipation effect.

[0043] This utility model also discloses an oil-cooled motor, including the oil-cooled motor stator as described above.

[0044] This utility model has many other embodiments. All technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this utility model.

Claims

1. An oil-cooled motor stator, comprising a stator core and windings passing through the stator core, characterized in that: The stator core includes a central core and end cores coaxially disposed at both ends of the central core. The end cores include multiple first stator laminations stacked axially. The yokes of the first stator laminations have two or more types of oil injection holes arranged circumferentially. The radial distance between the different types of oil injection holes and the outer periphery of the first stator laminations is different. Adjacent first stator laminations are rotated and misaligned circumferentially, so that the oil injection holes are interconnected axially and stacked together to form a first cooling oil channel. The central core includes multiple second stator laminations stacked axially. Adjacent second stator laminations are rotated and misaligned circumferentially. Each second stator lamination has an oil inlet on its outer periphery. Multiple oil inlets are interconnected axially to form an oil inlet channel. The yokes of the second stator laminations have multiple through holes arranged circumferentially. Multiple through holes are interconnected axially to form a second cooling oil channel inside the central core. The two ends of the oil inlet channel are connected to the second cooling oil channel. The second cooling oil channel is connected to the first cooling oil channel located at its two ends.

2. The oil-cooled motor stator according to claim 1, characterized in that: The yoke portion of the first stator lamination is provided with a first oil injection hole, a second oil injection hole, and a third oil injection hole along its circumference. The radial distance between the first oil injection hole and the outer periphery of the first stator lamination is greater than the radial distance between the second oil injection hole and the outer periphery of the first stator lamination, and the radial distance between the second oil injection hole and the outer periphery of the first stator lamination is greater than the radial distance between the third oil injection hole and the outer periphery of the first stator lamination.

3. The oil-cooled motor stator according to claim 2, characterized in that: The number of the first, second, and third oil injection holes is the same, and the first, second, and third oil injection holes are arranged at equal angles on the yoke of the first stator lamination, with a rotational misalignment angle of 120° between two adjacent first stator laminations.

4. The oil-cooled motor stator according to claim 2, characterized in that: The first injection hole is a T-shaped hole, and the second and third injection holes are circular and / or elliptical and / or waist-shaped injection holes.

5. The oil-cooled motor stator according to claim 1, characterized in that: The central iron core includes a second stator lamination arranged at a first circumferential angle and a second stator lamination arranged at a second circumferential angle. The second stator laminations arranged at the first angle and the second stator laminations arranged at the second angle are staggered and superimposed. Each through hole on the second stator lamination is connected to two through holes on its adjacent second stator lamination, forming a second cooling oil channel in the central iron core.

6. The oil-cooled motor stator according to claim 1, characterized in that: The yoke of the second stator lamination is provided with a plurality of through holes of the same shape at equal angles along its circumference.

7. The oil-cooled motor stator according to claim 1, characterized in that: The stator core and the outer periphery of the winding are provided with a housing, and oil guide rings are provided at both ends of the housing. The oil guide ring includes an end cover, a limiting inner ring provided on the inner periphery of the end cover, and a limiting outer ring provided on the outer periphery of the end cover. The limiting inner ring is provided on the inner periphery of the winding, and the limiting outer ring is provided on the outer periphery of the winding.

8. The oil-cooled motor stator according to claim 7, characterized in that: The inner limiting ring has a bottom opening, and the outer limiting ring has drainage ports on both sides. The height of the drainage ports is between the bottom of the outer limiting ring and the opening height of the inner limiting ring.

9. An oil-cooled motor, characterized in that: Includes the oil-cooled motor stator as described in any one of claims 1-8.

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