Stator Cooling Structure, Drive Motor, and New Energy Vehicle

Abstract

The present application provides a stator cooling structure, a drive motor, and a new energy vehicle. The stator cooling structure includes a stator core (1), the stator core (1) includes a stator yoke (2) and stator teeth (3), a stator slot (4) is formed between adjacent stator teeth (3), a stator winding (5) is wound on the stator teeth (3), the stator winding (5) includes end windings (6) located at both ends of the stator core (1), a cooling flow channel (7) is provided on the stator yoke (2), the cooling flow channel (7) is a bent structure, an opening at one end of the cooling flow channel (7) close to the end winding (6) is located radially outside the end winding (6), and an opening at the end of the cooling flow channel (7) far from the end winding (6) communicates with the stator slot (4). According to the stator cooling structure of the present application, uniform cooling of the winding can be ensured, the problem of excessive local temperature of the winding can be avoided, and the stability and service life of the motor can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and specifically relates to a stator cooling structure, a drive motor, and a new energy vehicle. Background Art

[0002] In recent years, the new energy vehicle field has developed rapidly, and the competition in the industry has been increasing day by day. More and more manufacturers are focusing on the application of oil cooling technology in the main drive motors of passenger vehicles to improve the power density of the main drive system from a technical perspective.

[0003] At the current stage, for the products of each manufacturer, in order to reduce the volume and save costs, the main solutions adopted are to increase the motor speed and improve the cooling conditions to increase the power density. Increasing the motor speed is restricted by factors such as bearings, oil seals, and the speed ratio of the supporting reducer, and often produces many negative effects. In terms of improving the cooling conditions, the cooling effect of water cooling is limited, and using heat-conducting materials to improve the heat transfer efficiency is generally restricted by factors such as material costs or process complexity, and is not suitable for mass production. Therefore, at the current stage, the most effective solution is to use oil cooling technology. However, most of the existing oil cooling solutions have complex oil circuit structures, increasing the processing technology cost, or the oil circuit structures are unreasonable, and the cooling effect is limited. Especially for the cooling of the stator, there are often uneven cooling situations.

[0004] Currently, during the actual operation of the main drive motor of a new energy vehicle, when it is at low speed and high torque, a large amount of heat is generated by the stator and rotor of the main drive motor. The current heat dissipation method of the main drive motor of a new energy vehicle is mostly to open spiral water channels inside the motor housing, and through the circulating flow of water inside the housing, the cooling effect of the motor is achieved. This cooling method has the problem that the motor windings and bearings cannot be directly cooled and lubricated, and the main heat sources of the main drive motor cannot be effectively cooled. Therefore, the motor heat load is limited, and then the motor volume is limited.

[0005] If oil cooling is adopted, the cooling oil can directly contact each heat source of the motor and achieve targeted cooling in terms of structure. Each heat source of the main drive motor is effectively cooled. Under the same performance requirements, compared with traditional water-cooled motors, the oil-cooled motor has an increased heat load, the motor volume can be reduced, and the power density is thus increased. The cooling oil can also lubricate and cool the motor bearings at the same time, and thus the motor life is also increased.

[0006] The current motor oil cooling method is to directly cool the stator windings, but the existing oil cooling method has the problem of uneven winding cooling, resulting in too high local temperature of the windings, which easily affects the service life of the motor. Summary of the Invention

[0007] Therefore, the technical problem to be solved by this application is to provide a stator cooling structure, a drive motor, and a new energy vehicle, which can ensure uniform cooling of the windings, avoid the problem of excessive local temperature of the windings, and improve the stability and service life of the motor.

[0008] To solve the above problems, this application provides a stator cooling structure, including a stator core. The stator core includes a stator yoke and stator teeth. Stator slots are formed between adjacent stator teeth. A stator winding is wound around the stator teeth. The stator winding includes end windings located at both ends of the stator core. A cooling flow channel is provided on the stator yoke. The cooling flow channel is a bent structure. One end opening of the cooling flow channel close to the end winding is located radially outside the end winding. The other end opening of the cooling flow channel far from the end winding is communicated with the stator slot.

[0009] Preferably, along the direction away from the end winding, the cooling flow channel is bent radially inward of the stator core.

[0010] Preferably, the stator core includes a first core segment and a second core segment. The first core segment is stacked by first core laminations, and the second core segment is stacked by second core laminations. A first flow channel segment is provided on the first core segment. A second flow channel segment is provided on the second core lamination. The first flow channel segment is located radially outside the end winding. One end of the second flow channel segment is communicated with the first flow channel segment, and the other end of the second flow channel segment is communicated with the stator slot.

[0011] Preferably, the stator core further includes a third core segment. The third core segment is provided between the first core segment and the second core segment. The third core segment is stacked by third core laminations. A third flow channel segment is provided on the third core segment. A part of the third flow channel segment coincides with at least part of the first flow channel segment, and another part of the third flow channel segment coincides with part of the second flow channel segment. The first flow channel segment and the second flow channel segment are communicated through the third flow channel segment.

[0012] Preferably, partition protrusions are oppositely provided on both side walls of the stator slot. The partition protrusions divide the stator slot into a wire slot part and a medium flow part. A communication channel is formed between the partition protrusions to communicate the wire slot part and the medium flow part. The medium flow part extends along the axial direction of the stator core. The cooling flow channel is communicated with the medium flow part.

[0013] Preferably, the medium flow part axially penetrates the stator core.

[0014] Preferably, a heat conduction plate is provided in the communication channel.

[0015] Preferably, the cross section of the medium flow part is arc-shaped or rectangular.

[0016] Preferably, cooling flow channels are respectively provided at both ends of the stator core.

[0017] Preferably, the width of the second flow passage section is smaller than the width of the stator slot.

[0018] Preferably, the stator cooling structure further includes a housing sleeved outside the stator core. A cooling water passage and / or an axial oil passage is / are arranged in the housing, and the cooling water passage and the axial oil passage are not communicated with each other.

[0019] Preferably, the stator cooling structure further includes an oil inlet, a three-way pipe and an oil injection ring. The first interface of the three-way pipe is communicated with the oil inlet, the second interface of the three-way pipe is communicated with the axial oil passage, and the third interface of the three-way pipe is communicated with the oil injection ring. The oil injection ring is sleeved on the outer peripheral side of the end winding, and oil injection holes are arranged on the oil injection ring corresponding to the inlets of the cooling flow passages.

[0020] Preferably, the oil injection ring includes an annular cavity. The oil injection holes are communicated with the annular cavity, and the three-way pipe is communicated with the annular cavity.

[0021] Preferably, each stator slot is correspondingly provided with a cooling flow passage, and at least one oil injection hole is correspondingly arranged for each cooling flow passage.

[0022] Preferably, oil injection holes are arranged on the inner peripheral wall of the oil injection ring.

[0023] Preferably, the cross section of the first flow passage section is circular, the cross section of the second flow passage section is rectangular, and the cross section of the third flow passage section is a combination of circular and rectangular.

[0024] According to one aspect of the present application, a driving motor is provided, including a stator cooling structure, and the stator cooling structure is the above-mentioned stator cooling structure.

[0025] According to one aspect of the present application, a new energy vehicle is provided, including the above-mentioned stator cooling structure or the above-mentioned driving motor.

[0026] The stator cooling structure provided by this application includes a stator core. The stator core includes a stator yoke and stator teeth. Stator slots are formed between adjacent stator teeth. A stator winding is wound around the stator teeth. The stator winding includes end windings located at both ends of the stator core. A cooling flow channel is provided on the stator yoke. The cooling flow channel is a bent structure. One end opening of the cooling flow channel close to the end winding is located radially outside the end winding. The other end opening of the cooling flow channel far from the end winding communicates with the stator slot. The cooling flow channel of this stator cooling structure adopts a bent structure, so that the inlet position can be located radially outside the end winding, thus avoiding the end winding from obstructing the entry of cooling oil, enabling the cooling oil to smoothly enter the cooling flow channel from the outside. The outlet of the cooling flow channel communicates with the stator slot. Therefore, the cooling oil can enter the stator slot through the cooling flow channel and flow along the stator slot through the end winding, effectively cooling the stator winding located in the stator slot. It can solve the problems of uneven winding cooling and too high local temperature existing in the existing oil cooling method, reduce the heat island effect inside the motor, thereby improving the stability and service life of the motor; it can also enhance the heat dissipation performance of the main heat sources inside the motor, improve the power density of the motor, enhance the performance, and at the same time simplify the complex external cooling structure of the existing traditional oil-cooled prototype, save costs, and achieve the lightweight and integration of the main drive motor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic cross-sectional structure diagram of a drive motor of this application;

[0028] Figure 2 is a schematic structure diagram of the first iron core punching sheet of a drive motor of this application;

[0029] Figure 3 is Figure 2 an enlarged structure diagram at position B of

[0030] Figure 4 is a schematic structure diagram of the first iron core punching sheet of a drive motor of this application;

[0031] Figure 5 is Figure 4 an enlarged structure diagram at position D of

[0032] Figure 6 is a schematic structure diagram of the first iron core punching sheet of a drive motor of this application;

[0033] Figure 7 is Figure 6 an enlarged structure diagram at position C of

[0034] Figure 8 is a schematic structure diagram of the first iron core punching sheet of a drive motor of this application;

[0035] Figure 9 isFigure 8 Schematic diagram of the enlarged structure at A;

[0036] Figure 10 This is a schematic structural diagram of a first core punching sheet of a driving motor of the present application;

[0037] Figure 11 for Figure 10 Schematic diagram of the enlarged structure at F;

[0038] Figure 12 This is a schematic structural diagram of a stator slot of a drive motor according to an embodiment of the present application;

[0039] Figure 13 This is a cross-sectional structural diagram of a three-way pipe of a driving motor according to an embodiment of the present application;

[0040] Figure 14 This is a schematic structural diagram of a stator core of a drive motor according to an embodiment of the present application;

[0041] Figure 15 This is a structural diagram of a cooling channel of a stator core of a drive motor according to an embodiment of the present application;

[0042] Figure 16 A three-dimensional structural diagram of an oil injection ring of a drive motor according to an embodiment of the present application;

[0043] Figure 17 This is a schematic structural diagram of a stator core of a drive motor according to an embodiment of the present application;

[0044] Figure 18 This is a structural diagram of the cooling channel of the stator core of a drive motor according to an embodiment of the present application.

[0045] The reference numerals are:

[0046] 1. stator core; 2. stator yoke; 3. stator teeth; 4. stator slots; 5. stator winding; 6. end winding; 7. cooling channel; 8. first core section; 9. second core section; 10. third core section; 11. first channel section; 12. second channel section; 13. third channel section; 14. partition protrusion; 15. wire slot section; 16. medium flow section; 17. heat conduction plate; 18. housing; 19. cooling water channel; 20. axial oil channel; 21. oil inlet; 22. three-way pipe; 23. oil injection ring; 24. oil injection hole; 25. annular cavity; 26. motor main shaft; 27. rear end cover; 28. motor rotor; 29. ​​front end cover; 30. rotor baffle; 31. bearing baffle; 32. bearing; 33. welding ring; 34. slot insulation paper; 35. fourth core section. DETAILED DESCRIPTION

[0047] See also Figures 1 to 18As shown, according to an embodiment of the present application, the stator cooling structure includes a stator core 1, the stator core 1 includes a stator yoke 2 and stator teeth 3, a stator slot 4 is formed between adjacent stator teeth 3, a stator winding 5 is wound around the stator teeth 3, the stator winding 5 includes end windings 6 located at both ends of the stator core 1, a cooling flow channel 7 is provided on the stator yoke 2, the cooling flow channel 7 is a bent structure, and one end of the cooling flow channel 7 close to the end winding 6 is opened on the radial outer side of the end winding 6, and the other end of the cooling flow channel 7 far from the end winding 6 is communicated with the stator slot 4.

[0048] The cooling flow channel 7 of this stator cooling structure adopts a bent structure, so that the inlet position can be located on the radial outer side of the end winding 6, thus avoiding the end winding 6 from obstructing the entry of the cooling oil, enabling the cooling oil to smoothly enter the cooling flow channel 7 from the outside. The outlet of the cooling flow channel 7 is communicated with the stator slot 4. Therefore, the cooling oil can enter the stator slot 4 through the cooling flow channel 7 and flow along the stator slot 4 through the end winding 6 to effectively cool the stator winding 5 located in the stator slot 4. It can solve the problems of uneven winding cooling and too high local temperature existing in the existing oil cooling method, reduce the heat island effect inside the motor, thereby improving the stability and service life of the motor; it can also enhance the heat dissipation performance of the main heat source inside the motor, improve the power density of the motor, enhance the performance, and at the same time simplify the complex external cooling structure of the existing traditional oil-cooled prototype, save costs, and achieve the lightweight and integration of the main drive motor system.

[0049] In one embodiment, along the direction away from the end winding 6, the cooling flow channel 7 is bent towards the radial inner side of the stator core 1. In this embodiment, the cooling flow channel 7 is arranged at a position close to the outer peripheral wall of the stator core 1 at a position close to the end winding 6, so that the inlet of the cooling flow channel 7 can be located on the outer peripheral side of the end winding 6, without being blocked by the end winding 6, facilitating the introduction of the cooling oil, enabling the cooling oil to enter the inside of the stator core 1 to cool the stator winding 5, and improving the cooling efficiency and cooling effect.

[0050] In one embodiment, the stator core 1 includes a first core segment 8 and a second core segment 9. The first core segment 8 is formed by stacking first core laminations, and the second core segment 9 is formed by stacking second core laminations. A first flow channel segment 11 is provided on the first core segment 8, a second flow channel segment 12 is provided on the second core lamination, the first flow channel segment 11 is located on the radial outer side of the end winding 6, one end of the second flow channel segment 12 is communicated with the first flow channel segment 11, and the other end of the second flow channel segment 12 is communicated with the stator slot 4.

[0051] In this embodiment, two types of stator laminations with different structures can be used to design the stator core 1. By using the different flow channels on the different stator laminations, a combined flow channel structure is formed to achieve the bending design of the cooling flow channel 7. This forming method of the stator core 1 has a simple structure and can quickly and conveniently form a stator core with a bent cooling flow channel 7, enabling the cooling oil to bypass the overly high end windings 6 and enter the interior of the stator core 1, effectively cooling the stator core 1 or the wire packages and end wire packages in the stator slots 4, thereby reducing the internal temperature of the motor.

[0052] Since the cooling flow channel 7 of the stator core 1 of the present application is formed by combining different stator laminations, the structure is more ingenious, the assembly is more convenient, no additional parts need to be added, the processing and assembly costs can be saved, and the cooling efficiency can be greatly improved.

[0053] In one embodiment, the stator core 1 further includes a third core segment 10. The third core segment 10 is disposed between the first core segment 8 and the second core segment 9. The third core segment 10 is formed by stacking third core laminations. A third flow channel segment 13 is provided on the third core segment 10. A part of the third flow channel segment 13 coincides with at least part of the first flow channel segment 11, and another part of the third flow channel segment 13 coincides with a part of the second flow channel segment 12. The first flow channel segment 11 and the second flow channel segment 12 are connected through the third flow channel segment 13.

[0054] In this embodiment, by adding the third core segment 10 between the first core segment 8 and the second core segment 9, different stator core structures can be formed by using three different types of stator core laminations, enabling the bending amplitude of the cooling flow channel 7 to be significantly reduced, reducing the flow loss. At the same time, the structure of the cooling flow channel 7 can be designed more reasonably, so that the structure of the cooling flow channel 7 can better meet the internal heat dissipation requirements of the stator core 1.

[0055] In one embodiment, the stator core 1 further includes a fourth core segment 35. The fourth core segment 35 is formed by stacking fourth core laminations. No cooling flow channel 7 is provided on the fourth core segment 35. The stator slots 4 on it are connected to the stator slots 4 on the second core segment 9 to realize the flow of the cooling oil. In this embodiment, the fourth core segment 35 is a conventional core segment, occupying a relatively large axial length. The first core segment 8, the second core segment 9, and the third core segment 10 are core segments specially designed to form the bent cooling flow channel 7, so they have a unique structure and a relatively short axial length. It only needs to satisfy smoothly introducing the external cooling oil into the interior of the stator core 1 through the cooling flow channel 7, enabling the cooling oil to flow axially along the stator slots 4 inside the stator core 1, thereby effectively cooling the stator windings 5 in the stator slots 4.

[0056] In one embodiment, partition protrusions 14 are oppositely arranged on the two side walls of the stator slot 4. The partition protrusions 14 divide the stator slot 4 into a wire slot portion 15 and a medium flow portion 16. A communication channel connecting the wire slot portion 15 and the medium flow portion 16 is formed between the partition protrusions 14. The medium flow portion 16 extends along the axial direction of the stator core 1, and the cooling channel 7 is communicated with the medium flow portion 16.

[0057] In this embodiment, the partition protrusions 14 can be used to partition the wire slot portion 15 and the medium flow portion 16, so that the stator winding 5 can be kept within the wire slot portion 15 and will not enter the medium flow portion 16, thereby keeping the medium flow portion 16 unobstructed. The cooling oil can flow smoothly within the medium flow portion 16 to effectively cool both the interior of the stator core 1 and the stator winding 5, effectively reducing the temperature of the stator core 1 and the temperature of the motor.

[0058] Slot insulating paper 34 is arranged in the wire slot portion 15. When winding the stator winding 5, the slot insulating paper 34 is first placed in the stator slot 4, and then the enameled copper wire is inserted to achieve insulation between the stator winding 5 and the stator core 1.

[0059] In one embodiment, the medium flow portion 16 axially penetrates the stator core 1. By forming an axially through medium flow portion 16 between the stator core 1 and the motor rotor, not only can the medium flow portion 16 be used to enable the cooling oil to flow axially to all positions of the stator core 1 to more effectively cool the stator winding 5 and the stator core 1 at all positions, but also the cavities formed by the punching slots on each iron core segment can be used to form a sound insulation space to more effectively reduce the motor noise.

[0060] In one embodiment, a heat conducting plate 17 is arranged in the communication channel. The heat conducting plate 17 is arranged between the wire slot portion 15 and the medium flow portion 16, and can block the wire slot portion 15 and the medium flow portion 16, thereby effectively preventing the stator winding 5 from entering the medium flow portion 16 through the communication channel and forming an obstruction to the flow of the cooling oil, ensuring the flow efficiency of the cooling oil within the medium flow portion 16, and further ensuring the cooling effect of the cooling oil on the stator core 1 and the stator winding 5. In addition, the heat conducting plate 17 can be made of metal materials such as copper and aluminum, so that the heat generated by the stator winding 5 can be quickly transferred to the cooling oil and carried away by the cooling oil to effectively cool down the stator winding 5. To ensure the heat dissipation effect of the heat conducting plate 17, the heat conducting plate 17 is preferably made of a material with a higher thermal conductivity than copper.

[0061] The cross-section of the medium flow portion 16 is arc-shaped or rectangular. The medium flow portion 16 can be directly formed by dividing the stator slot 4 itself, or a groove can be opened at the bottom of the stator slot 4 so that the entire stator slot 4 is filled with the stator winding 5, and the medium flow portion 16 is formed by using the groove at the bottom of the stator slot 4 to cool down the stator core 1 and the stator winding 5.

[0062] In one embodiment, cooling channels 7 are respectively arranged at both ends of the stator core 1. In this embodiment, one cooling channel 7 at the first end is communicated with one medium flow portion 16, and one cooling channel 7 at the second end is communicated with another medium flow portion 16 adjacent to the medium flow portion 16 communicated with the cooling channel 7 at the first end, so that the cooling oil in the cooling channels in two adjacent stator slots 4 can flow crosswise, that is, one is in the forward direction and the other is in the reverse direction. The number of stator slots 4 is an even number, that is, the number of cooling channels 7 is also an even number. Half of them are located at the first end of the stator core 1 to form forward cooling, and half of them are located at the second end of the stator core 1 to form reverse cooling. This staggered cooling can make the cooling of the stator core 1 more uniform and avoid local overheating.

[0063] In one embodiment, the width of the second flow channel section 12 is smaller than the width of the stator slot 4. By making the cooling channel 7 change the cross-sectional area of the flow channel suddenly during the flow process, the flow rate of the cooling oil is forced to increase, so that the cooling oil can be more quickly diverted into the cooling channel 7 to realize the flow cooling of the cooling oil.

[0064] In one embodiment, the stator cooling structure further includes a housing 18. The housing 18 is sleeved outside the stator core 1, and a cooling water channel 19 and / or an axial oil channel 20 are arranged in the housing 18, and the cooling water channel 19 and the axial oil channel 20 do not communicate with each other.

[0065] In this embodiment, the housing 18 is a water-cooled housing. The inside of the motor is cooled by cooling oil. After the cooling oil enters the inside of the motor, it enters the inside of the stator core 1 through the cooling channel 7 with a bending structure. The cooling oil flows along the cooling channel 7 on the stator and the stator slot 4 in the axial direction of the stator to cool the wire package in the stator slot 4. Finally, the cooling oil flows out from the end of the stator core 1 to cool the end winding 6.

[0066] In this application, the cooling of the motor adopts an oil-water mixed cooling system. The cooling water channel 19 and the axial oil channel 20 are arranged on the housing 18 at the same time, and the cooling oil and the cooling water are separated from each other and do not communicate. The cooling oil can enter the inside of the motor to cool the wire package of the stator winding 5, the rotor and lubricate the bearing, and the cooling water can indirectly cool the stator and rotor cores, thereby further improving the cooling and temperature reduction ability of the stator cooling structure.

[0067] In one embodiment, the stator cooling structure further includes an oil inlet 21, a tee 22, and an oil injection ring 23. The first interface of the tee 22 is communicated with the oil inlet 21, the second interface of the tee 22 is communicated with the axial oil passage 20, and the third interface of the tee 22 is communicated with the oil injection ring 23. The oil injection ring 23 is sleeved on the outer peripheral side of the end winding 6, and oil injection holes 24 are arranged corresponding to the inlets of the cooling channels 7.

[0068] In one embodiment, the oil injection ring 23 includes an annular cavity 25. The oil injection holes 24 are communicated with the annular cavity 25, and the tee 22 is communicated with the annular cavity 25. By providing the annular cavity 25, it is possible to make each oil injection hole 24 communicate with the annular cavity 25. An oil inlet hole connected to the tee 22 is provided on the outer peripheral wall of the oil injection ring 23. The cooling oil enters the oil injection ring 23 from the tee 22 through the oil inlet hole, first flows through the annular cavity 25 of the oil injection ring 23 to various positions of the oil injection ring 23, and then sprays out from each oil injection hole 24 to supply oil to the cooling channels 7.

[0069] When the cooling channels 7 are arranged alternately in the circumferential direction at both ends of the stator core 1, the structure of the oil injection holes 24 on the oil injection ring 23 is also adjusted accordingly. That is, the oil injection holes 24 on the oil injection ring 23 at the first end are arranged corresponding to a group of cooling channels 7 with odd numbers, and the oil injection holes 24 on the oil injection ring 23 at the second end are arranged corresponding to a group of cooling channels 7 with even numbers. The numbers of the cooling channels 7 can be set arbitrarily, as long as it can be ensured that the cooling channels 7 with odd numbers and the cooling channels 7 with even numbers are arranged alternately in the circumferential direction.

[0070] In one embodiment, each stator slot 4 is correspondingly provided with a cooling channel 7, and each cooling channel 7 is correspondingly provided with at least one oil injection hole 24.

[0071] In one embodiment, oil injection holes 24 are provided on the inner peripheral wall of the oil injection ring 23, so that while the oil injection ring 23 supplies oil to the cooling channels 7, it can also supply oil to the end winding 6, and directly cools the end winding 6 by using the oil injection ring 23, further improving the cooling effect of the end winding 6.

[0072] In one embodiment, the cross-section of the first flow channel section 11 is circular, the cross-section of the second flow channel section 12 is rectangular, and the cross-section of the third flow channel section 13 is a combination of circular and rectangular.

[0073] In other embodiments, the cross-sectional shapes of the above-mentioned respective flow channel sections can also be other shapes, or combinations of shapes, as long as they can meet the bending design of the cooling channels 7, so as to smoothly introduce the cooling oil from the outside of the stator core 1 into the inside of the stator core 1.

[0074] The oil circuit circulation process of the cooling channels is as follows:

[0075] The cooling oil enters the interior of the motor from the external oil circuit through the oil inlet 21. First, it flows through the axial flow channel of the three-way pipe 22 at the rear end, and then divides into two paths. One path flows into the radial flow channel of the three-way pipe and enters the spray ring 23 at the rear end. The cooling oil enters the cooling flow channel 7 of the stator core 1 through the axially arranged spray holes 24 on the spray ring 23 to cool the stator core 1 and the motor rotor 28, and then flows back to the external oil circuit. The other path flows through the axial oil circuit 20 into the axial flow channel of the three-way pipe 22 at the front end, and then flows into the spray ring 23 at the front end through the radial flow channel of the three-way pipe 22 at the front end. The cooling oil enters the cooling flow channel 7 of the stator core 1 through the spray holes 24 of the spray ring 23 at the front end to cool the stator core 1 and the motor rotor 28, and then flows back to the external oil circuit.

[0076] The stator cooling structure of the embodiment of the present application adopts a hybrid cooling method, which can fundamentally solve the problem that the stator windings of the current water-cooled drive motor cannot be cooled, and can also solve the problems of uneven winding cooling and too high local temperature existing in the existing oil-cooling method, reduce the heat island effect inside the motor, thereby improving the stability and service life of the motor; it can also enhance the heat dissipation performance of the main heat sources inside the motor, improve the power density of the motor, enhance the performance, and at the same time simplify the complex external cooling structure of the existing traditional oil-cooled prototype, save costs, and achieve the lightweight and integration of the main drive motor system.

[0077] According to the embodiment of the present application, the drive motor includes a stator cooling structure, and this stator cooling structure is the above-mentioned stator cooling structure.

[0078] The drive motor further includes a motor main shaft 26, a rear end cover 27, a motor rotor 28, a front end cover 29, a rotor baffle 30, a bearing baffle 31, bearings 32 and a welding ring 33. The above-mentioned various components are assembled and combined to form the above-mentioned stator cooling structure to effectively cool the motor.

[0079] According to the embodiment of the present application, the new energy vehicle includes the above-mentioned stator cooling structure or the above-mentioned drive motor.

[0080] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0081] The above is only the preferred embodiment of the present application, and it is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in the technical field of the present application, several improvements and variations can be made without departing from the technical principle of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A stator cooling structure, characterized in that, It includes a stator core (1), the stator core (1) includes a stator yoke (2) and stator teeth (3), a stator slot (4) is formed between adjacent stator teeth (3), a stator winding (5) is wound around the stator teeth (3), the stator winding (5) includes end windings (6) located at both ends of the stator core (1), a cooling flow channel (7) is provided on the stator yoke (2), the cooling flow channel (7) is of a bent structure, one end opening of the cooling flow channel (7) close to the end winding (6) is located radially outside the end winding (6), and the other end opening of the cooling flow channel (7) away from the end winding (6) communicates with the stator slot (4); Along the direction away from the end winding (6), the cooling flow channel (7) bends towards the radially inner side of the stator core (1); The stator core (1) includes a first core segment (8) and a second core segment (9), the first core segment (8) is formed by stacking first core laminations, the second core segment (9) is formed by stacking second core laminations, a first flow channel segment (11) is provided on the first core segment (8), a second flow channel segment (12) is provided on the second core lamination, the first flow channel segment (11) is located radially outside the end winding (6), one end of the second flow channel segment (12) communicates with the first flow channel segment (11), and the other end of the second flow channel segment (12) communicates with the stator slot (4).

2. The stator cooling structure according to claim 1, wherein, The stator core (1) further includes a third core segment (10), the third core segment (10) is provided between the first core segment (8) and the second core segment (9), the third core segment (10) is formed by stacking third core laminations, a third flow channel segment (13) is provided on the third core segment (10), a part of the third flow channel segment (13) coincides with at least part of the first flow channel segment (11), another part of the third flow channel segment (13) coincides with a part of the second flow channel segment (12), and the first flow channel segment (11) and the second flow channel segment (12) are communicated through the third flow channel segment (13).

3. The stator cooling structure according to claim 1, wherein, Partition protrusions (14) are oppositely arranged on both side walls of the stator slot (4), the partition protrusions (14) divide the stator slot (4) into a wire slot part (15) and a medium circulation part (16), a communication channel connecting the wire slot part (15) and the medium circulation part (16) is formed between the partition protrusions (14), the medium circulation part (16) extends along the axial direction of the stator core (1), and the cooling flow channel (7) communicates with the medium circulation part (16).

4. The stator cooling structure according to claim 3, wherein The medium circulation part (16) axially penetrates through the stator core (1).

5. The stator cooling structure according to claim 3, characterized in that, A heat conducting plate (17) is arranged in the communication channel.

6. The stator cooling structure according to claim 3, characterized in that The cross section of the medium circulation part (16) is arc-shaped or rectangular.

7. The stator cooling structure according to claim 1, characterized in that The cooling flow channels (7) are respectively arranged at both ends of the stator core (1).

8. The stator cooling structure according to claim 1, wherein The width of the second flow channel segment (12) is smaller than the width of the stator slot (4).

9. The stator cooling structure according to any one of claims 1 to 8, characterized in that The stator cooling structure further includes a housing (18), the housing (18) is sleeved outside the stator core (1), a cooling water channel (19) and / or an axial oil channel (20) is arranged in the housing (18), and the cooling water channel (19) and the axial oil channel (20) are not communicated with each other.

10. The stator cooling structure according to claim 9, characterized in that, The stator cooling structure further includes an oil inlet (21), a three-way pipe (22) and an oil injection ring (23). The first interface of the three-way pipe (22) is communicated with the oil inlet (21), the second interface of the three-way pipe (22) is communicated with the axial oil channel (20), the third interface of the three-way pipe (22) is communicated with the oil injection ring (23), the oil injection ring (23) is sleeved on the outer peripheral side of the end winding (6), and an oil injection hole (24) is arranged on the oil injection ring (23) corresponding to the inlet of the cooling flow channel (7).

11. The stator cooling structure according to claim 10, characterized in that, The oil injection ring (23) includes an annular cavity (25), the oil injection hole (24) is communicated with the annular cavity (25), and the three-way pipe (22) is communicated with the annular cavity (25).

12. The stator cooling structure according to claim 10, wherein, Each stator slot (4) is correspondingly provided with a cooling flow channel (7), and at least one oil injection hole (24) is correspondingly arranged for each cooling flow channel (7).

13. The stator cooling structure according to claim 11, wherein The oil injection hole (24) is arranged on the inner peripheral wall of the oil injection ring (23).

14. The stator cooling structure according to claim 2, characterized in that, The cross section of the first flow channel section (11) is circular, the cross section of the second flow channel section (12) is rectangular, and the cross section of the third flow channel section (13) is a combination of circular and rectangular.

15. A driving motor, comprising a stator cooling structure, characterized in that, The stator cooling structure is the stator cooling structure according to any one of claims 1 to 14.

16. A new energy vehicle, characterized in that, It includes the stator cooling structure according to any one of claims 1 to 14 or the drive motor according to claim 15.

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