Axial flux motor stator assembly structure based on oil immersion cooling system

Abstract

The utility model discloses an axial magnetic flux motor stator assembly structure based on an oil immersion cooling system, which comprises a casing assembly, a stator outer sleeve, a stator iron core, a stator inner sleeve, a fixing pin, a sealing plate, a winding coil, a pressing plate, a bearing, an upper partition plate and a lower partition plate, the stator iron core is installed between the stator inner sleeve and the stator outer sleeve through the fixing pin, the sealing plate is connected to the axial end of the stator iron core, and the pressing plate is connected with an inner hole of the stator inner sleeve in a matched mode to press the sealing plate. The stator outer sleeve, the stator inner sleeve and the sealing plates on the two sides form an oil immersion cooling channel of the stator assembly, heat is brought out of the stator assembly through cooling oil, and the oil immersion cooling effect of the stator assembly is achieved. According to the utility model, the rigidity of the stator assembly is improved, the assembly process is simple, the heat dissipation efficiency of the stator is improved, the problems of high temperature rise and insufficient heat dissipation capability of the existing axial magnetic flux motor stator assembly are solved, and the performance of the motor is improved.

Description

Technical Field

[0001] This utility model relates to the field of axial flux motor technology, and in particular to a stator assembly structure for an axial flux motor based on an oil-immersion cooling system. Background Technology

[0002] With the rapid development of new energy vehicle technology, people have increasingly higher requirements for the performance of drive motors, and the contradiction between the power and size of drive motors is becoming more and more prominent. Compared with traditional radial magnetic field motors, axial flux motors have advantages such as short axial dimension, high power density, light weight, and high efficiency. Therefore, the application of axial flux motors in new energy vehicles is particularly important.

[0003] Unlike traditional radial magnetic field motors where the stator core and housing are connected by an interference fit, resulting in high stator rigidity and reliability, axial magnetic field motors cannot achieve a reliable interference fit with the housing, especially for dual-rotor single-stator axial magnetic field motors. Patent application number 202311300841.X discloses an axial flux motor and vehicle, where the stator core is fixed using end plates, leading to poor stator rigidity and a high susceptibility to stator rubbing and other malfunctions during installation or operation. Patent application number 202210764595.2 discloses a stator structure, axial flux motor, powertrain, and vehicle, where the stator core is fixed using a flange and slot pins. As the stator core is a wound-formed part, controlling the accuracy of its inner and outer diameters is difficult, making interference fit with the flange extremely challenging, and the slot pins affect slot fill factor, thus making stator assembly installation extremely complex.

[0004] As the speed of electric vehicles continues to increase, the speed and power of axial flux motors are also constantly increasing, leading to problems such as high load and high heat generation. This not only limits the further improvement of motor torque density and efficiency but also causes winding insulation damage, seriously affecting the stable operation of the motor. Therefore, solving the heat dissipation problem of axial flux motors has become an important technical means to improve motor performance. Patent application number 202211051223.1 discloses an oil cooling system for axial flux motors, in which the oil injection pipe is located inside the housing and surrounds the stator assembly to cool the stator assembly. However, the oil injection cooling structure in this patent leads to uneven distribution of cooling oil, causing local overheating of the motor. Patent application number 202310102285.9 discloses an oil-cooled rotor structure for axial flux motors, in which the turntable has an oil guide channel and is installed on the shaft, using centrifugal force to throw cooling oil into the motor to cool the stator windings. However, the oil-throwing cooling structure in this patent is highly dependent on the motor speed. When the motor is running at low speed, the cooling oil cannot fully wet the stator surface, which will affect the performance and reliability of the motor. While existing motor oil cooling systems can effectively reduce motor temperature to some extent, they also suffer from uneven oil distribution and difficulty in heat dissipation in localized areas.

[0005] Therefore, solving the problems of unreliable stator core fixing, installation difficulties, and poor heat dissipation in axial flux motors has become an important issue in improving the reliability of axial flux motors, optimizing stator heat dissipation conditions, and reducing production costs. Utility Model Content

[0006] This utility model provides a stator assembly structure for an axial flux motor with high stator core fixing stiffness, simple assembly, high heat dissipation efficiency, and high motor performance.

[0007] The technical solution to achieve the purpose of this utility model is: an axial flux motor stator assembly structure based on an oil-immersion cooling system, including a housing assembly, a stator outer sleeve, a stator core, a stator inner sleeve, a fixing pin, a sealing plate, a winding coil, a pressure plate, a bearing, an upper partition, and a lower partition;

[0008] The housing assembly is equipped with a stator outer sleeve, and the stator core is installed between the stator inner sleeve and the stator outer sleeve by a fixing pin; the sealing plate is connected to the axial end of the stator core, and the pressure plate is connected to the inner hole of the stator inner sleeve to press the sealing plate tightly;

[0009] The stator outer sleeve, stator inner sleeve, and sealing plates on both sides form an oil-immersion cooling channel for the stator assembly. The cooling oil carries the heat out of the stator assembly, achieving the effect of oil-immersion cooling of the stator assembly.

[0010] Furthermore, the housing assembly includes a housing, an electrical box, an oil inlet, and an oil outlet;

[0011] The housing provides a mounting frame for the motor, used to install various components of the motor; the oil inlet and outlet are used for the input and output of cooling oil; the electrical box is connected to an external power source to supply power to the motor.

[0012] Furthermore, the stator sleeve is provided with a plurality of stator sleeve pin holes arranged in a circumferential array along the axial direction;

[0013] The stator outer sleeve is provided with a wire outlet hole, an oil inlet hole, and an oil outlet hole respectively at the positions of the electrical box, oil inlet, and oil outlet of the housing assembly; a plurality of stator outer sleeve guide blocks are evenly arranged circumferentially along the axial direction at the inner diameter position of the stator outer sleeve, and the stator outer sleeve guide blocks are semi-circular or semi-elliptical.

[0014] Furthermore, the stator core includes a stator yoke, stator teeth, and stator core pin holes;

[0015] The stator core is formed by stamping and winding thin silicon steel sheets.

[0016] The stator teeth are evenly distributed around the circumference of the stator yoke axis on the two axial end faces of the stator yoke. Multiple stator core pin holes are provided in the radial direction in the middle of the stator yoke, and the stator core pin holes are located in the middle position of two axially distributed stator teeth.

[0017] Furthermore, the stator inner sleeve has multiple stator inner sleeve pin holes arranged radially in the middle, and the stator inner sleeve pin holes are blind holes; the stator inner sleeve pin holes are evenly arranged circumferentially along the axial direction; bearing holes are provided at the inner diameter of the stator inner sleeve; annular sealing grooves are provided at both axial end faces of the stator inner sleeve; multiple stator inner sleeve guide blocks are evenly arranged circumferentially along the axial direction at the outer circle of the stator inner sleeve, and the stator inner sleeve guide blocks are semi-circular or semi-elliptical in shape; the bearing is located in the bearing hole of the stator inner sleeve; the bearing is an angular contact bearing.

[0018] Furthermore, the fixing pin is made of stainless steel or ceramic material, and one end is provided with a guide angle for installing the fixing pin into the stator outer sleeve pin hole, the stator core pin hole and the stator inner sleeve pin hole.

[0019] Furthermore, the number of stator outer sleeve pin holes, stator core pin holes, stator inner sleeve pin holes, and fixing pins are the same, and the stator outer sleeve pin holes, stator core pin holes, and stator inner sleeve pin holes at corresponding positions are arranged on the same straight line.

[0020] Furthermore, the sealing plate is provided with an iron core groove, an inner oil passage, an outer oil passage, and a radial oil passage;

[0021] The iron core slots are evenly arranged circumferentially between the inner oil passage and the outer oil passage along the axial direction, and the radial oil passage is arranged between two adjacent iron core slots.

[0022] Furthermore, the oil inlet and oil outlet are arranged on the same side, and an upper baffle and a lower baffle are provided between the oil inlet and oil outlet to separate the cooling oil entering the oil immersion cooling channel from the cooling oil leaving the oil immersion cooling channel, so that the cooling oil can flow fully in the oil immersion cooling channel; the upper baffle is axially disposed between the stator outer sleeve and the outer diameter of the stator core, and the lower baffle is axially disposed between the stator inner sleeve and the inner diameter of the stator core, and is at the same radial angle position as the upper baffle.

[0023] Furthermore, in the oil-immersion cooling system, the flow path of the cooling oil is divided into two streams at the oil inlet, wherein:

[0024] The first stream flows along the outer end oil channel from the gap between the stator outer end winding coil and the stator outer sleeve to cool the stator core and the stator outer end winding coil at the location through which it flows.

[0025] The second stream flows through the gap between the winding coils in the stator slot along the channel in the slot, and then flows along the inner end oil channel to cool the stator core and the winding coils at the inner end of the stator where it flows. After encountering the guide block in the inner sleeve of the stator, the flow trajectory changes and flows along the channel in the slot to cool the stator core and the winding coils in the stator slot, and merges with the first stream of cooling oil.

[0026] The cooling oil flows along a preset trajectory, and through repeated cycles, it achieves sufficient heat exchange and cooling of the stator core and winding coils. Finally, under the action of oil pressure, the cooling oil flows out from the oil outlet, completing the oil circuit circulation.

[0027] Compared with the prior art, the present invention has the following significant advantages: (1) Several fixing pins are used in the stator assembly to fix the stator core to the housing, which improves the rigidity of the stator assembly and simplifies the assembly process, thus solving the problems of insufficient fixing rigidity and complex assembly process of the stator core of the existing axial flux motor; (2) Guide blocks are set at the inner and outer sleeves of the stator, so that cooling oil can also flow through the slot gaps of the stator winding, which strengthens the cooling of the slot winding and improves the heat dissipation efficiency of the stator; (3) The oil channels set in the sealing plates at both ends allow the cooling oil to flow through the surface of the winding coil, which strengthens the cooling of the winding in the high eddy current loss area near the air gap, solves the problems of high temperature rise and insufficient heat dissipation capacity of the existing axial flux motor stator assembly, and improves the performance of the motor. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an axial flux motor stator assembly based on an oil-immersion cooling system according to this utility model.

[0029] Figure 2 This is a side structural sectional view of the present invention.

[0030] Figure 3This is a schematic diagram of the stator core structure in this utility model.

[0031] Figure 4 This is a schematic diagram of the stator jacket structure in this utility model.

[0032] Figure 5 This is a schematic diagram of the stator inner sleeve in this utility model.

[0033] Figure 6 This is a structural schematic diagram of the housing assembly in this utility model.

[0034] Figure 7 This is a schematic diagram of the sealing plate in the utility model. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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.

[0037] In the description of this utility model, the use of terms such as "several" means one or more, with "multiple" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the quantity of indicated technical features, or the sequential relationship between indicated technical features.

[0038] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0039] As a specific example, such as Figure 1 , Figure 2 As shown, the present invention discloses a stator assembly structure for an axial flux motor based on an oil-immersion cooling system, comprising a housing assembly 2, a stator outer sleeve 3, a stator core 4, a stator inner sleeve 5, a fixing pin 6, a sealing plate 7, a winding coil 8, a pressure plate 9, a bearing 10, an upper partition 11, and a lower partition 12.

[0040] The housing assembly 2 is provided with a stator outer sleeve 3 inside, and the stator core 4 is installed between the stator inner sleeve 5 and the stator outer sleeve 3 by a fixing pin 6; the sealing plate 7 is connected to the axial end of the stator core 4, and the pressure plate 9 is connected to the inner hole of the stator inner sleeve 5 to press the sealing plate 7 tightly.

[0041] The stator outer sleeve 3, stator inner sleeve 5, and sealing plates 7 on both sides form an oil-immersion cooling channel for the stator assembly, allowing the cooling oil to soak the entire stator and carry the heat out of the stator assembly through the cooling oil, thus achieving the effect of oil-immersion cooling of the stator assembly.

[0042] As a specific example, such as Figure 6 As shown, the housing assembly 2 includes a housing 2.1, an electrical box 2.2, an oil inlet 2.3, and an oil outlet 2.4;

[0043] The housing 2.1 provides a mounting frame for the motor, used to install various components of the motor; the oil inlet 2.3 and oil outlet 2.4 are used for the input and output of cooling oil; the electrical box 2.2 is connected to an external power supply to power the motor.

[0044] As a specific example, such as Figure 4 As shown, the stator sleeve 3 is provided with a plurality of stator sleeve pin holes 3.1 arranged in a circumferential array along the axial direction;

[0045] The stator outer casing 3 is provided with a wire outlet hole 3.2, an oil inlet hole 3.3, and an oil outlet hole 3.4 respectively at the positions of the electrical box 2.2, oil inlet 2.3, and oil outlet 2.4 of the housing assembly 2; a plurality of stator outer casing guide blocks 3.5 are evenly arranged circumferentially along the axial direction at the inner diameter position of the stator outer casing 3, and the stator outer casing guide blocks 3.5 are semi-circular or semi-elliptical.

[0046] As a specific example, the outlet hole 3.2 of the stator outer casing 3 corresponds to the position of the electrical box 2.2 in the housing assembly 2. The three-phase winding outlet wires are led out through the electrical box 2.2 and then through the gland. Both the electrical box 2.2 and the gland are sealed. The electrical box 2.2 is sealed with a gasket, and the gland is sealed with an O-ring.

[0047] As a specific example, such as Figure 3 As shown, the stator core 4 includes a stator yoke 4.1, stator teeth 4.2, and stator core pin holes 4.3;

[0048] The stator core 4 is formed by stamping and winding thin silicon steel sheets.

[0049] The stator teeth 4.2 are evenly distributed around the axis of the stator yoke 4.1 on the two axial end faces of the stator yoke 4.1. Multiple stator core pin holes 4.3 are provided in the radial direction in the middle of the stator yoke 4.1. The stator core pin holes 4.3 are located in the middle position of the two axially distributed stator teeth 4.2.

[0050] As a specific example, such as Figure 5 As shown, the stator inner sleeve 5 has multiple stator inner sleeve pin holes 5.1 arranged radially in the middle, and the stator inner sleeve pin holes 5.1 are blind holes; the stator inner sleeve pin holes 5.1 are evenly arranged circumferentially along the axial direction; bearing holes 5.2 are provided at the inner diameter of the stator inner sleeve 5; annular sealing grooves 5.3 are provided at both axial end faces of the stator inner sleeve 5, and O-rings are placed in the annular sealing grooves 5.3 to provide a sealing effect and prevent coolant leakage through the contact surface between the sealing plate 7 and the stator inner sleeve 5; multiple stator inner sleeve guide blocks 5.4 are evenly arranged circumferentially along the axial direction at the outer circle of the stator inner sleeve 5, and the shape of the stator inner sleeve guide blocks 5.4 is semi-circular or semi-elliptical; the bearing 10 is disposed in the bearing holes 5.2 of the stator inner sleeve 5; the bearing 10 is an angular contact bearing.

[0051] As a specific example, the fixing pin 6 is made of stainless steel or ceramic material. The number of fixing pins 6 or the material of fixing pins 6 can be changed according to the requirements of stator stiffness. One end of the fixing pin 6 is provided with a guide angle for installing the fixing pin 6 into the stator outer sleeve pin hole 3.1, the stator core pin hole 4.3 and the stator inner sleeve pin hole 5.1.

[0052] As a specific example, the number of stator outer sleeve pin holes 3.1, stator core pin holes 4.3, stator inner sleeve pin holes 5.1 and fixing pins 6 are the same, and the stator outer sleeve pin holes 3.1, stator core pin holes 4.3 and stator inner sleeve pin holes 5.1 at corresponding positions are arranged on the same straight line.

[0053] As a specific example, such as Figure 7 As shown, the sealing plate 7 is provided with an iron core groove 7.1, an inner oil passage 7.2, an outer oil passage 7.3, and a radial oil passage 7.4;

[0054] The core slots 7.1 are evenly arranged circumferentially between the inner oil passages 7.2 and the outer oil passages 7.3 along the axial direction, and the radial oil passages 7.4 are arranged between two adjacent core slots 7.1.

[0055] As a specific example, the pressure plate 9 is coaxially connected to the inner hole of the stator inner sleeve 5 and presses against the sealing plate 7. The pressure plate 9 serves two purposes: first, it presses against the inner diameter of the sealing plate 7 to ensure the reliability of the seal; second, it presses against the outer ring of the bearing 10 to axially limit the bearing 10. The above-mentioned sealing structure has the advantages of simple manufacturing process, good sealing effect, low cost, and minimal impact on electromagnetic performance.

[0056] As a specific example, such as Figure 4 As shown, the oil inlet 3.3 and the oil outlet 3.4 are arranged on the same side. An upper partition 11 and a lower partition 12 are provided between the oil inlet 3.3 and the oil outlet 3.4 to separate the cooling oil entering the oil immersion cooling channel from the cooling oil leaving the oil immersion cooling channel, so that the cooling oil can flow fully in the oil immersion cooling channel. The upper partition 11 is arranged axially between the outer diameter of the stator outer sleeve 3 and the outer diameter of the stator core 4, and the lower partition 12 is arranged axially between the inner diameter of the stator inner sleeve 5 and the inner diameter of the stator core 4, and is at the same radial angle as the upper partition 11.

[0057] As a specific example, such as Figure 1 As shown, in the oil immersion cooling system, the flow path of the cooling oil is divided into two streams at the oil inlet 2.3, wherein:

[0058] The first stream flows along the outer end oil passage 3.6 from the gap between the stator outer end winding coil 8 and the stator outer sleeve 3 to cool the stator core 5 and the stator outer end winding coil 8 at the location through which it flows.

[0059] The second stream flows through the gap between the winding coils 8 in the stator slot along the slot flow channel 8.1, and then flows along the inner end oil channel 5.5 to cool the stator core 5 and the winding coils 8 at the inner end of the stator where it flows. After encountering the stator inner sleeve guide block 5.4, it changes its flow trajectory and flows along the slot flow channel 8.1 to cool the stator core 5 and the winding coils 8 in the stator slot, and merges with the first stream of cooling oil.

[0060] The cooling oil flows along a preset trajectory, and through repeated cycles, it achieves sufficient heat exchange and cooling of the stator core 4 and the winding coil 8. Finally, under the action of oil pressure, the cooling oil flows out from the oil outlet 2.4, completing the oil circuit circulation.

[0061] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

[0062] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

[0063] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A stator assembly structure for an axial flux motor based on an oil-immersion cooling system, characterized in that, Includes housing assembly (2), stator outer sleeve (3), stator core (4), stator inner sleeve (5), fixing pin (6), sealing plate (7), winding coil (8), pressure plate (9), bearing (10), upper partition (11) and lower partition (12); The housing assembly (2) is provided with a stator outer sleeve (3) inside. The stator core (4) is installed between the stator inner sleeve (5) and the stator outer sleeve (3) by a fixing pin (6). The sealing plate (7) is connected to the axial end of the stator core (4). The pressure plate (9) is connected to the inner hole of the stator inner sleeve (5) to press the sealing plate (7). The stator outer sleeve (3), stator inner sleeve (5) and the sealing plates (7) on both sides form an oil-immersion cooling channel for the stator assembly. The cooling oil carries the heat out of the stator assembly, achieving the effect of oil-immersion cooling of the stator assembly.

2. The axial flux motor stator assembly structure based on an oil-immersion cooling system according to claim 1, characterized in that, The housing assembly (2) includes a housing (2.1), an electrical box (2.2), an oil inlet (2.3), and an oil outlet (2.4). The housing (2.1) provides a mounting frame for the motor, which is used to install various components of the motor; the oil inlet (2.3) and oil outlet (2.4) are used for the input and output of cooling oil; the electrical box (2.2) is connected to an external power supply to power the motor.

3. The axial flux motor stator assembly structure based on an oil-immersion cooling system according to claim 2, characterized in that, The stator sleeve (3) is provided with a plurality of stator sleeve pin holes (3.1) arranged in a circumferential array along the axial direction. The stator sleeve (3) is provided with a wire outlet hole (3.2), an oil inlet hole (3.3), and an oil outlet hole (3.4) respectively at the positions of the electrical box (2.2), oil inlet (2.3), and oil outlet (2.4) of the housing assembly (2); a plurality of stator sleeve guide blocks (3.5) are evenly arranged circumferentially along the axial direction at the inner diameter position of the stator sleeve (3), and the stator sleeve guide blocks (3.5) are semi-circular or semi-elliptical.

4. The axial flux motor stator assembly structure based on an oil-immersion cooling system according to claim 3, characterized in that, The stator core (4) includes a stator yoke (4.1), stator teeth (4.2), and stator core pin holes (4.3). The stator core (4) is formed by stamping and winding thin silicon steel sheets; The stator teeth (4.2) are evenly distributed around the axis of the stator yoke (4.1) on the two axial end faces of the stator yoke (4.1). Multiple stator core pin holes (4.3) are provided in the radial direction in the middle of the stator yoke (4.1). The stator core pin holes (4.3) are located in the middle of the two axially distributed stator teeth (4.2).

5. The axial flux motor stator assembly structure based on an oil-immersion cooling system according to claim 4, characterized in that, The stator inner sleeve (5) has multiple stator inner sleeve pin holes (5.1) arranged radially in the middle, and the stator inner sleeve pin holes (5.1) are blind holes; the stator inner sleeve pin holes (5.1) are evenly arranged circumferentially along the axial direction; the stator inner sleeve (5) has bearing holes (5.2) at the inner diameter of the stator inner sleeve (5); the stator inner sleeve (5) has annular sealing grooves (5.3) at both axial end faces; the stator inner sleeve (5) has multiple stator inner sleeve guide blocks (5.4) evenly arranged circumferentially along the axial direction at the outer circle of the stator inner sleeve (5), and the stator inner sleeve guide blocks (5.4) are semi-circular or semi-elliptical in shape; the bearing (10) is located in the bearing holes (5.2) of the stator inner sleeve (5); the bearing (10) is an angular contact bearing.

6. The stator assembly structure of the axial flux motor based on the oil-immersion cooling system according to claim 5, characterized in that, The fixing pin (6) is made of stainless steel or ceramic material, and one end is provided with a guide angle for installing the fixing pin (6) into the stator outer sleeve pin hole (3.1), the stator core pin hole (4.3) and the stator inner sleeve pin hole (5.1).

7. The axial flux motor stator assembly structure based on an oil-immersion cooling system according to claim 6, characterized in that, The number of stator outer sleeve pin holes (3.1), stator core pin holes (4.3), stator inner sleeve pin holes (5.1) and fixing pins (6) are the same, and the stator outer sleeve pin holes (3.1), stator core pin holes (4.3) and stator inner sleeve pin holes (5.1) at corresponding positions are arranged on the same straight line.

8. The stator assembly structure of an axial flux motor based on an oil-immersion cooling system according to any one of claims 3 to 7, characterized in that, The sealing plate (7) is provided with an iron core groove (7.1), an inner oil passage (7.2), an outer oil passage (7.3) and a radial oil passage (7.4). The core slots (7.1) are evenly arranged circumferentially between the inner oil passage (7.2) and the outer oil passage (7.3) in the axial direction, and the radial oil passage (7.4) is arranged between two adjacent core slots (7.1).

9. The stator assembly structure of an axial flux motor based on an oil-immersion cooling system according to claim 8, characterized in that, The oil inlet (3.3) and oil outlet (3.4) are arranged on the same side. An upper partition (11) and a lower partition (12) are provided between the oil inlet (3.3) and the oil outlet (3.4) to separate the cooling oil entering the oil immersion cooling channel from the cooling oil leaving the oil immersion cooling channel, so that the cooling oil can flow fully in the oil immersion cooling channel. The upper partition (11) is arranged axially between the outer diameter of the stator outer sleeve (3) and the outer diameter of the stator core (4). The lower partition (12) is arranged axially between the inner diameter of the stator inner sleeve (5) and the inner diameter of the stator core (4), and is at the same radial angle as the upper partition (11).

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