Stator cooling structure, stator, motor, power assembly and vehicle

Abstract

The embodiment of the invention provides a stator cooling structure, a stator, a motor, a power assembly and a vehicle, the stator cooling structure comprises a shell, the shell is used for accommodating the stator, and the shell and the stator define a cooling cavity; and the cooling assembly divides the cooling cavity into an outer cavity and an inner cavity, and a cooling medium can enter the inner cavity from the outer cavity. The cooling cavity is defined by the shell and the stator, and the cooling cavity is divided into an outer cavity and an inner cavity by the cooling assembly. Therefore, under the condition that the stator is in contact with the cooling medium in the inner cavity for heat exchange, as the pressure of the cooling medium in the outer cavity is increased, a pressure difference is formed between the outer cavity and the inner cavity, and the cooling medium in the outer cavity can enter the inner cavity through the cooling assembly under the action of the pressure difference, so that the cooling medium sufficiently circulates in the inner cavity; therefore, the cooling medium is in full contact with the stator for heat exchange, and the cooling effect of the stator is improved.

Description

A stator cooling structure, stator, motor, powertrain, and vehicle Technical Field

[0001] This application belongs to the field of vehicle technology, specifically relating to a stator cooling structure, a stator, a motor, a powertrain, and a vehicle. Background Technology

[0002] Axial flux motors (hereinafter referred to as motors) are widely used in the electric vehicle field due to their advantages such as small size, high torque density, high power density, and high efficiency. During operation, motors generate various losses, leading to heat generation, with the stator being the primary heat-generating component.

[0003] In related technologies, cooling medium is introduced into the motor to bring it into contact with the stator, thereby cooling the stator. However, the cooling medium often fails to make sufficient contact with the stator for heat exchange, resulting in poor stator cooling performance. Summary of the Invention

[0004] This application aims to provide a stator cooling structure, stator, motor, powertrain, and vehicle to solve the problem that existing cooling media cannot fully contact the stator for heat exchange, resulting in poor stator cooling performance.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, this application discloses a stator cooling structure, comprising:

[0007] A housing for accommodating a stator, the housing and the stator enclosing a cooling chamber;

[0008] And a cooling assembly that divides the cooling chamber into an outer chamber and an inner chamber, through which a cooling medium can enter the inner chamber from the outer chamber.

[0009] Optionally, two cooling chambers are provided, and the two cooling chambers are arranged radially apart along the stator. The cooling chamber located on the outer side is the first cooling chamber, which is used to cool the radially outer side of the stator. The cooling chamber located on the inner side is the second cooling chamber, which is used to cool the radially inner side of the stator.

[0010] Optionally, the stator cooling structure further includes a sealing element disposed within the housing, the sealing element, the housing, and the stator enclosing to form the first cooling chamber and the second cooling chamber.

[0011] Optionally, the stator includes a stator core and a stator winding wound around the stator core, wherein at least a portion of the stator winding protrudes from the radially outer and radially inner sides of the stator core to form a first end winding and a second end winding, respectively.

[0012] The first cooling chamber is used to accommodate the first end winding so that the cooling medium entering the first cooling chamber contacts the first end winding for heat exchange; the second cooling chamber is used to accommodate the second end winding so that the cooling medium entering the second cooling chamber contacts the second end winding for heat exchange.

[0013] Optionally, the sealing element includes a first sealing ring and a second sealing ring, wherein the first sealing ring and the second sealing ring are arranged radially spaced apart along the stator and located outside the second sealing ring;

[0014] The first sealing ring, together with the housing and the stator, forms the first cooling chamber, and the second sealing ring, together with the housing and the stator, forms the second cooling chamber.

[0015] Optionally, the seal further includes a sealing portion disposed between the first sealing ring and the second sealing ring and connected to the first sealing ring and the second sealing ring respectively.

[0016] Optionally, the stator core is provided with a mounting groove extending radially along the stator core on the side near the sealing part, the mounting groove being used to mount the stator winding;

[0017] The sealing part is a sealing strip, which is adapted to be sealed and connected with the mounting groove.

[0018] Optionally, multiple mounting slots are provided, and the multiple mounting slots are spaced apart along the circumference of the stator core;

[0019] Multiple sealing strips are provided, and the multiple sealing strips are spaced apart along the circumference of the sealing element, with one sealing strip embedded in one mounting groove.

[0020] Optionally, the first sealing ring, the second sealing ring, and the sealing strip together form an integrally molded structure.

[0021] Optionally, the seal and the cooling assembly are integrally formed.

[0022] Optionally, the stator cooling structure further includes a first sealing ring, which is disposed between the sealing element and the housing to make the sealing element and the housing sealed together.

[0023] Optionally, the stator cooling structure further includes a second sealing ring disposed between the cooling assembly and the housing, so as to seal the cooling assembly and the housing.

[0024] Optionally, the cooling assembly includes a first cooling element and a second cooling element disposed radially spaced along the stator;

[0025] The first cooling element is disposed in the first cooling chamber to divide the first cooling chamber into a first outer chamber and a first inner chamber, and the cooling medium can enter the first inner chamber from the first outer chamber;

[0026] The second cooling element is disposed in the second cooling chamber to divide the second cooling chamber into a second outer chamber and a second inner chamber, and the cooling medium can enter the second inner chamber from the second outer chamber.

[0027] Optionally, the cooling medium pressure in the first outer chamber is greater than the cooling medium pressure in the first inner chamber, and the cooling medium pressure in the second outer chamber is greater than the cooling medium pressure in the second inner chamber.

[0028] Optionally, the first cooling element is a first spray ring, which is provided with a first spray hole for spraying the cooling medium of the first outer chamber into the first inner chamber.

[0029] Optionally, the first spray hole is provided as a plurality of holes, and the plurality of first spray holes are spaced apart along the circumferential and / or axial direction of the first spray ring.

[0030] Optionally, the first spray ring extends along the axial direction of the stator so that the first outer chamber and the first inner chamber are distributed radially apart along the stator.

[0031] Optionally, the second cooling element is a second spray ring, which is provided with a second spray hole for spraying the cooling medium from the second outer chamber into the second inner chamber.

[0032] Optionally, the second spray hole is provided as a plurality of holes, which are spaced apart along the circumferential and / or axial direction of the second spray ring.

[0033] Optionally, the second spray ring extends along the axial direction of the stator so that the second outer chamber and the second inner chamber are distributed radially apart along the stator.

[0034] The housing includes: an end plate, a first side plate, and a second side plate;

[0035] Optionally, the end plate is disposed at one end of the stator away from the seal, the first side plate and the second side plate extend circumferentially along the end plate and are spaced apart radially from the stator, and the first side plate is located outside the second side plate;

[0036] The end plate, the first side plate, the seal, and the stator together form the first cooling chamber, and the end plate, the second side plate, the seal, and the stator together form the second cooling chamber.

[0037] Optionally, the housing is provided with a cooling medium channel, which is connected to the first cooling chamber and the second cooling chamber respectively.

[0038] Optionally, the cooling medium channel includes an inlet channel and an outlet channel, the inlet channel being connected to the first outer chamber and the second outer chamber respectively, and the outlet channel being connected to the first inner chamber and the second inner chamber respectively.

[0039] Optionally, the liquid inlet channel is disposed on the end plate and / or the first side plate;

[0040] And / or, the liquid outlet channel is disposed on the end plate and / or the first side plate.

[0041] Optionally, the liquid inlet channel is disposed on the end plate, and the liquid inlet channel includes: a liquid inlet, a first connecting port, and a second connecting port;

[0042] The liquid inlet is used to connect with an external cooling device;

[0043] The first communication port and the second communication port are arranged radially apart along the stator. The first communication port communicates with the first outer cavity, and the second communication port communicates with the second outer cavity.

[0044] Optionally, the liquid inlet channel includes a first liquid inlet channel and a second liquid inlet channel;

[0045] The first liquid inlet channel is connected to the first outer chamber;

[0046] The second liquid inlet channel is connected to the second outer chamber.

[0047] Optionally, the first liquid inlet channel is disposed on the first side plate or the end plate, and the second liquid inlet channel is disposed on the end plate.

[0048] Optionally, the liquid outlet channel is disposed on the end plate, and the liquid outlet channel includes: a liquid outlet, a third connecting port and a fourth connecting port;

[0049] The liquid outlet is used to connect with an external cooling device;

[0050] The third and fourth communication ports are arranged radially apart along the stator. The third communication port communicates with the first inner cavity, and the fourth communication port communicates with the second inner cavity.

[0051] Optionally, the liquid inlet channel is a liquid inlet hole, and / or the liquid outlet channel is a liquid outlet hole.

[0052] Secondly, this application also discloses a stator, including the aforementioned stator cooling structure.

[0053] Optionally, a stator core and a stator winding are provided, wherein the stator winding is wound around the stator core, and at least a portion of the stator winding protrudes from the radially outer and radially inner sides of the stator core to form a first end winding and a second end winding, respectively, and the cooling assembly is used to cool the first end winding and / or the second end winding.

[0054] Optionally, the housing includes: a first side plate surrounding the stator core, wherein the side plate opposite to the stator core has a mounting cavity;

[0055] The stator also includes a junction box disposed within the mounting cavity, and the junction box is used for electrical connection with the stator winding.

[0056] Thirdly, this application also discloses an electric motor, including: a rotating shaft, a rotor, and the aforementioned stator;

[0057] The rotor and the stator are spaced apart axially on the shaft.

[0058] The rotating shaft passes through the rotor and the stator. The rotating shaft is fixedly connected to the rotor and rotatably connected to the stator, so that the rotor can rotate relative to the stator.

[0059] Optionally, there are two stators, which are arranged on opposite axial sides of the rotor.

[0060] Fourthly, this application also discloses a powertrain including the aforementioned motor.

[0061] Fifthly, this application also discloses a vehicle including the aforementioned motor or powertrain.

[0062] In this embodiment, on the one hand, since the housing and stator enclose a cooling chamber, the cooling medium entering the cooling chamber can fully contact and exchange heat with the stator, which is beneficial to improving the cooling effect of the stator. On the other hand, since the cooling assembly divides the cooling chamber into an outer chamber and an inner chamber, when the stator is in contact with the cooling medium located in the inner chamber for heat exchange, as the pressure of the cooling medium in the outer chamber increases, a pressure difference is formed between the outer chamber and the inner chamber. Under the action of the pressure difference, the cooling medium in the outer chamber can enter the inner chamber through the cooling assembly, allowing the cooling medium to circulate fully in the inner chamber, thereby allowing the cooling medium to further fully contact and exchange heat with the stator, which is beneficial to further improving the cooling effect of the stator.

[0063] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0064] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0065] Figure 1 is one of the structural schematic diagrams of an electric motor provided in an embodiment of this application;

[0066] Figure 2 is a second schematic diagram of the structure of an electric motor provided in an embodiment of this application;

[0067] Figure 3 is a third schematic diagram of the structure of an electric motor provided in an embodiment of this application;

[0068] Figure 4 is a partial structural schematic diagram of an electric motor provided in an embodiment of this application;

[0069] Figure 5 is one of the structural schematic diagrams of the shell provided in the embodiment of this application;

[0070] Figure 6 is a second schematic diagram of the structure of the shell provided in an embodiment of this application;

[0071] Figure 7 is a schematic diagram of the stator structure provided in an embodiment of this application;

[0072] Figure 8 is a schematic diagram of the stator core provided in an embodiment of this application;

[0073] Figure 9 is a schematic diagram of the stator winding provided in an embodiment of this application;

[0074] Figure 10 is a schematic diagram of the sealing element and cooling assembly of the stator cooling structure provided in the embodiment of this application;

[0075] Figure 11 is a schematic diagram of the liquid inlet fluid domain and liquid spraying fluid domain of the stator cooling structure provided in the embodiment of this application;

[0076] Figure 12 is a schematic diagram of the liquid outlet fluid domain of the stator cooling structure provided in the embodiment of this application.

[0077] Reference numerals: 1. Housing, 11. End plate, 12. First side plate, 13. Second side plate, 14. Liquid inlet channel, 141. Liquid inlet, 142. First connecting port, 143. Second connecting port, 15. Liquid outlet channel, 151. Liquid outlet, 152. Third connecting port, 153. Fourth connecting port, 16. Mounting cavity, 2. Stator, 21. Stator core, 211. Peripheral wall, 2111. First peripheral wall, 2112. Second peripheral wall, 212. Mounting slot, 22. Stator winding, 221. First end winding, 222. Second end winding, 2 23. Middle winding; 3. Cooling assembly; 31. First spray ring; 311. First spray hole; 32. Second spray ring; 321. Second spray hole; 4. Cooling chamber; 41. First cooling chamber; 411. First outer chamber; 412. First inner chamber; 42. Second cooling chamber; 421. Second outer chamber; 422. Second inner chamber; 5. Seal; 51. First sealing ring; 52. Second sealing ring; 53. Sealing strip; 6. Rotor; 7. Shaft; 8. Bearing; A. Inlet fluid domain; B. Spray fluid domain; C. Outlet fluid domain. Detailed Implementation

[0078] Embodiments of the present invention will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0079] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0080] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0081] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0082] This application provides a stator cooling structure, which will be described in detail below with reference to the accompanying drawings.

[0083] Referring to Figures 1 to 3, a schematic diagram of the structure of an electric motor provided in an embodiment of this application is shown. Referring to Figure 4, a partial schematic diagram of the structure of an electric motor provided in an embodiment of this application is shown. Referring to Figures 5 and 6, a schematic diagram of the structure of the housing provided in an embodiment of this application is shown. Referring to Figure 7, a schematic diagram of the structure of the stator provided in an embodiment of this application is shown. Referring to Figure 8, a schematic diagram of the structure of the stator core provided in an embodiment of this application is shown. Referring to Figure 9, a schematic diagram of the structure of the stator winding provided in an embodiment of this application is shown. Referring to Figure 10, a schematic diagram of the structure of the seal and cooling assembly of the stator cooling structure provided in an embodiment of this application is shown. Referring to Figure 11, a schematic diagram of the liquid inlet fluid domain and liquid spraying fluid domain of the stator cooling structure provided in an embodiment of this application is shown. Referring to Figure 12, a schematic diagram of the liquid outlet fluid domain of the stator cooling structure provided in an embodiment of this application is shown.

[0084] As shown in Figures 1 to 4, this application provides a stator cooling structure, including: a housing 1 for accommodating a stator 2, the housing 1 and the stator 2 enclosing a cooling chamber 4; and a cooling assembly 3 that divides the cooling chamber 4 into an outer chamber and an inner chamber, wherein a cooling medium can enter the inner chamber from the outer chamber.

[0085] In this embodiment, on the one hand, since the housing 1 and the stator 2 enclose a cooling chamber 4, the cooling medium entering the cooling chamber 4 can fully contact and exchange heat with the stator 2, which is beneficial to improving the cooling effect of the stator 2. On the other hand, since the cooling assembly 3 divides the cooling chamber 4 into an outer chamber and an inner chamber, when the stator 2 is in contact with the cooling medium located in the inner chamber for heat exchange, as the pressure of the cooling medium in the outer chamber increases, a pressure difference is formed between the outer chamber and the inner chamber. Under the action of the pressure difference, the cooling medium in the outer chamber can enter the inner chamber through the cooling assembly 3, allowing the cooling medium to circulate fully in the inner chamber, thereby allowing the cooling medium to further fully contact and exchange heat with the stator 2, which is beneficial to further improving the cooling effect of the stator 2.

[0086] It should be noted that the stator 2 includes a stator core 21 and stator windings 22 wound around the stator core 21. The cooling medium can exchange heat not only with the stator windings 22 but also with at least a portion of the stator core 21. Through the circulation of the cooling medium, the heat from the stator windings 22 and the stator core 21 can be carried away to the outside of the motor, thereby achieving the cooling of the stator 2. It is understandable that when the cooling effect of the stator 2 is improved, on the one hand, the overall temperature of the motor decreases, which can increase the permanent magnet flux linkage and output torque, thereby increasing the torque density and efficiency of the motor. On the other hand, the current flowing through the stator windings 22 can be appropriately increased (i.e., the electrical load is increased), thereby increasing the output torque and power, further improving the torque density and power density of the motor. Furthermore, compared to indirectly cooled motors, the direct cooling method used in this embodiment allows the cooling medium to directly contact the stator 2, improving cooling efficiency while saving space. Thus, under the same torque and power requirements, the motor of this application can be designed to be smaller in size and weight, which is beneficial for powertrain and overall vehicle space layout, and also contributes to vehicle lightweighting. It should be noted that the cooling medium in this embodiment includes, but is not limited to, cooling oil (such as mineral oil), which also serves a lubricating function while cooling the stator windings 22.

[0087] In some optional embodiments of this application, two cooling chambers 4 are provided, and the two cooling chambers 4 are arranged radially apart along the stator 2. The cooling chamber 4 located on the outer side is the first cooling chamber 41, which is used to cool the radially outer side of the stator 2. The cooling chamber 4 located on the inner side is the second cooling chamber 42, which is used to cool the radially inner side of the stator 2.

[0088] In practical applications, since the stator 2 is usually annular, by setting the first cooling chamber 41 and the second cooling chamber 42, the radial outer side and radial inner side of the stator 2 can be cooled respectively, thereby increasing the heat exchange contact area between the stator 2 and the cooling medium, which is beneficial to further improve the cooling effect of the stator 2.

[0089] Further, as shown in Figures 7 to 9, the stator 2 includes a stator core 21 and a stator winding 22 wound around the stator core 21. At least a portion of the stator winding 22 protrudes radially outward and radially inward from the stator core 21, forming a first end winding 221 and a second end winding 222, respectively. A first cooling chamber 41 is used to accommodate the first end winding 221, so that the cooling medium entering the first cooling chamber 41 contacts and exchanges heat with the first end winding 221. A second cooling chamber 42 is used to accommodate the second end winding 222, so that the cooling medium entering the second cooling chamber 42 contacts and exchanges heat with the second end winding 222. It should be noted that the stator winding 22 also includes a middle winding 223. The stator core 21 is provided with a mounting groove 212. By winding the middle winding 223 in the mounting groove 212, a reliable connection between the stator winding 22 and the stator core 21 can be achieved.

[0090] Generally speaking, the stator winding 22 is the main heat-generating component of the stator. When the first end winding 221 formed on the radially outer side of the stator core 21 is located in the first cooling chamber 41, and the second end winding 222 formed on the radially inner side of the stator core 21 is located in the second cooling chamber 42, the stator winding 22 can fully contact the cooling medium for heat exchange, thereby removing a large amount of heat generated by the stator winding 22, which is beneficial to improving the cooling effect of the stator 2.

[0091] In practical applications, the motor also includes a rotor 6, which is disposed within the housing 1. The rotor 6 and the stator 2 are spaced apart axially along the stator 2 to form an air gap. To prevent the cooling medium from leaking into the air gap and causing a decrease in motor performance, in some optional embodiments of this application, the stator cooling structure also includes a sealing element 5. The sealing element 5 is disposed within the housing 1, and the sealing element 5, the housing 1, and the stator 2 enclose a first cooling chamber 41 and a second cooling chamber 42.

[0092] In this embodiment, a sealing element 5 is provided, and the sealing element 5, together with the housing 1 and the stator 2, forms a first cooling chamber 41 and a second cooling chamber 42. This improves the sealing performance of the first cooling chamber 41 and the second cooling chamber 42, effectively preventing the cooling medium from leaking into the air gap between the stator 2 and the rotor 6, which is beneficial to improving the working performance of the motor.

[0093] It should be noted that, in order to further improve the sealing effect between the seal 5 and the housing 1, the stator cooling structure of this embodiment further includes a first sealing ring, which is disposed between the seal 5 and the housing 1 to achieve a sealed connection between the seal 5 and the housing 1. Specifically, the housing 1 includes an end plate 11, a first side plate 12, and a second side plate 13. The end plate 11 is disposed at the end of the stator core 21 away from the seal 5. The first side plate 12 and the second side plate 13 extend circumferentially along the end plate 11 and are distributed at intervals in the radial direction of the stator 2, with the second side plate 13 close to the center of the end plate 11. The seal 5 is annular, with its outer annular surface connected to the first side plate 12 and its inner annular surface connected to the second side plate 13. Two first sealing rings are provided: one is disposed between the outer annular surface of the seal 5 and the first side plate 12, and the other is disposed between the inner annular surface of the seal 5 and the second side plate 13, thereby achieving a sealed connection between the seal 5 and the housing 1.

[0094] In some optional embodiments of this application, the sealing element 5 includes a first sealing ring 51 and a second sealing ring 52. The first sealing ring 51 and the second sealing ring 52 are arranged radially apart along the stator 2 and are located outside the second sealing ring 52. The first sealing ring 51, together with the housing 1 and the stator 2, forms a first cooling chamber 41, and the second sealing ring 52, together with the housing 1 and the stator 2, forms a second cooling chamber 42. In this way, by providing the first sealing ring 51 and the second sealing ring 52, the first cooling chamber 41 and the second cooling chamber 42 can each form a closed space, thereby allowing the first end winding 221 and the second end winding 222 to be cooled respectively, which is beneficial to improving the cooling reliability of the stator 2.

[0095] Specifically, as shown in Figures 5 and 6, the housing 1 includes: an end plate 11, a first side plate 12, and a second side plate 13; the end plate 11 is disposed at one end of the stator 2 away from the sealing member 5, the first side plate 12 and the second side plate 13 extend circumferentially along the end plate 11 and are distributed at intervals in the radial direction of the stator 2, and the first side plate 12 is located outside the second side plate 13; wherein, the end plate 11, the first side plate 12, the sealing member 5 and the stator 2 enclose to form a first cooling chamber 41, and the end plate 11, the second side plate 13, the sealing member 5 and the stator 2 enclose to form a second cooling chamber 42.

[0096] Furthermore, the stator core 21 includes two peripheral walls 211 spaced apart from the outside to the inside along the radial direction of the stator 2, namely the first peripheral wall 2111 and the second peripheral wall 2112. The first cooling chamber 41 is formed by the end plate 11, the first side plate 12, the first sealing ring 51 and the first peripheral wall 2111, and the second cooling chamber 42 is formed by the end plate 11, the second side plate 13, the second sealing ring 52 and the second peripheral wall 2112.

[0097] In this embodiment of the application, when a first cooling chamber 41 and a second cooling chamber 42 are respectively provided, and the first cooling chamber 41 is surrounded by a first sealing ring 51, a first peripheral wall 2111, and the end plate 11 and the first side plate 12 of the housing 1, and the second cooling chamber 42 is surrounded by a second sealing ring 52, a second peripheral wall 2112, and the end plate 11 and the second side plate 13 of the housing 1, the inner and outer sides of the stator winding 22, that is, the first end winding 221 and the second end winding 222, can be cooled respectively, which is beneficial to further improve the cooling effect of the stator 2.

[0098] It should be noted that the second side plate 13 can be integrally formed with the end plate 11 and the first side plate 12, or it can be integrally formed with the seal 5. This is not limited here, and those skilled in the art can adjust it according to actual needs. It is understood that when the second side plate 13 is integrally formed with the end plate 11 and the first side plate 12, the second side plate 13 should be made of the same material as the end plate 11 and the first side plate 12, such as metal, thereby improving the structural strength of the housing 1. When the second side plate 13 is integrally formed with the seal 5, the second side plate 13 should be made of the same material as the seal 5, such as non-metallic material, thereby reducing the overall weight of the motor.

[0099] In some optional embodiments of this application, the seal 5 further includes a sealing portion disposed between the first sealing ring 51 and the second sealing ring 52 and connected to the first sealing ring 51 and the second sealing ring 52 respectively.

[0100] In practical applications, the stator winding 22 includes multiple wires. When the multiple wires of the middle winding 223 are wound around the mounting groove 212 of the stator core 21, gaps exist between the multiple wires in the mounting groove 212, or between the wires and the edge of the mounting groove 212. This causes the cooling medium of the first cooling chamber 41 and the second cooling chamber 42 to leak into the air gap between the stator 2 and the rotor 6 through the aforementioned gaps. Based on this, in this embodiment, by providing a sealing part between the first sealing ring 51 and the second sealing ring 52, the leakage of cooling medium into the air gap can be effectively prevented, which is beneficial to improving the working performance of the motor.

[0101] In some optional embodiments of this application, a mounting groove 212 extending radially along the stator core 21 is provided on the side of the stator core 21 near the sealing portion. The mounting groove 212 is used to mount the stator winding 22. The sealing portion is a sealing strip 53, which is adapted to be sealed to the mounting groove 212. In this way, the sealing groove 212 can be sealed by the sealing strip 53 and the mounting groove 212, effectively preventing the cooling medium from leaking into the air gap, which is beneficial to improving the working performance of the motor.

[0102] Furthermore, since the seal 5 has a thickness in the axial direction of the stator 2, in one embodiment, to avoid the seal 5 occupying the air gap, the stator 2 has a first surface close to the rotor 6, and the seal 5 has a second surface close to the rotor 6, with the first and second surfaces being coplanar. This avoids the seal 5 occupying the air gap, which is beneficial for further improving the motor's operating performance.

[0103] In some optional embodiments of this application, multiple mounting slots 212 are provided, and the multiple mounting slots 212 are spaced apart circumferentially along the stator core 21; multiple sealing strips 53 are provided, and the multiple sealing strips 53 are spaced apart circumferentially along the sealing element 5, with one sealing strip 53 embedded in one mounting slot 212. In this way, by embedding one sealing strip 53 in one mounting slot 212, a reliable seal can be achieved on the entire end face of the stator core 21, thereby effectively preventing the cooling medium from leaking into the air gap.

[0104] It should be noted that the embodiments of this application do not limit the number of mounting slots 212 and sealing strips 53, and those skilled in the art can adjust them according to actual needs. It is understood that the number of mounting slots 212 and sealing strips 53 should be the same. By sealing one sealing strip 53 with one mounting slot 212, the entire end face of the stator core 21 can be sealed, effectively preventing leakage of the cooling medium.

[0105] In some optional embodiments of this application, the first sealing ring 51, the second sealing ring 52, and the sealing strip 53 together form an integrally molded structure. This improves the overall structural strength of the seal 5, thus extending its service life. Furthermore, since there are no gaps between the first sealing ring 51 and the sealing strip 53, or between the second sealing ring 52 and the sealing strip 53, the sealing performance of the entire seal 5 is improved. In addition, since no additional assembly steps are required between the first sealing ring 51, the second sealing ring 52, and the multiple sealing strips 53, the motor assembly process is simplified, the assembly requirements are reduced, and the assembly efficiency of the motor is improved.

[0106] In some optional embodiments of this application, the cooling assembly 3 includes a first cooling element and a second cooling element arranged radially spaced along the stator 2; the first cooling element is disposed in the first cooling chamber 41 to divide the first cooling chamber 41 into a first outer chamber 411 and a first inner chamber 412, and the cooling medium can enter the first inner chamber 412 from the first outer chamber 411; the second cooling element is disposed in the second cooling chamber 42 to divide the second cooling chamber 42 into a second outer chamber 421 and a second inner chamber 422, and the cooling medium can enter the second inner chamber 422 from the second outer chamber 421. Thus, by providing the first cooling element in the first cooling chamber 41 and the second cooling element in the second cooling chamber 42, both the first end winding 221 and the second end winding 222 of the stator winding 22 can receive sufficient and uniform cooling, which is beneficial for further improving the sufficiency and uniformity of cooling of the stator winding 22.

[0107] As shown in Figure 4, the first outer chamber 411 and the first inner chamber 412 of the first cooling chamber 41, and the second outer chamber 421 and the second inner chamber 422 of the second cooling chamber 42 are schematically illustrated by shading. In some optional embodiments of this application, the cooling medium pressure in the first outer chamber 411 is greater than the cooling medium pressure in the first inner chamber 412, and the cooling medium pressure in the second outer chamber 421 is greater than the cooling medium pressure in the second inner chamber 422.

[0108] Taking the first cooling chamber 41 as an example, since the cooling medium pressure in the first outer chamber 411 is greater than that in the first inner chamber 412, i.e., there is a pressure difference between the first outer chamber 411 and the first inner chamber 412, the cooling medium can enter the first inner chamber 412 at a higher pressure and circulate fully within the first chamber. This allows the cooling medium to fully contact and exchange heat with the first end winding 221, which is beneficial to improving the cooling effect of the stator 2. The second cooling chamber 42 works similarly and will not be described in detail here.

[0109] It should be noted that the embodiments of this application do not limit the cooling medium pressure of the first outer chamber 411 and the first inner chamber 412 of the first cooling chamber 41, and the second outer chamber 421 and the second inner chamber 422 of the second cooling chamber 42. Those skilled in the art can adjust it according to actual needs, such as the required injection pressure.

[0110] Furthermore, the first cooling component is a first spray ring 31, which is provided with a first spray hole 311 for spraying the cooling medium from the first outer chamber 411 into the first inner chamber 412. The second cooling component is a second spray ring 32, which is provided with a second spray hole 321 for spraying the cooling medium from the second outer chamber 421 into the second inner chamber 422.

[0111] In this embodiment, by providing a first spray ring 31 with a first spray hole 311, as the pressure of the cooling medium in the first outer chamber 411 increases, the cooling medium can be sprayed from the first spray hole 311 into the first inner chamber 412 to contact and exchange heat with the first end winding 221. By providing a second spray ring 32 with a second spray hole 321, as the pressure of the cooling medium in the second outer chamber 421 increases, the cooling medium can be sprayed from the second spray hole 321 into the second inner chamber 422 to contact and exchange heat with the second end winding 222. Since the sprayed cooling medium is usually a fine liquid, the contact heat exchange area between the cooling medium and the first end winding 221, and between the cooling medium and the second end winding 222, can be increased, allowing the cooling medium to fully contact and exchange heat with the stator winding 22, thereby improving the cooling effect of the stator 2.

[0112] Furthermore, due to the pressure difference between the first outer chamber 411 and the first inner chamber 412, the cooling medium in the first outer chamber 411 can be sprayed into the first inner chamber 412 at a higher injection pressure; similarly, due to the pressure difference between the second outer chamber 421 and the second inner chamber 422, the cooling medium in the second outer chamber 421 can be sprayed into the second inner chamber 422 at a higher injection pressure. Thus, on the one hand, the higher injection pressure allows the sprayed liquid to be finer, thereby further increasing the contact area between the cooling medium and the stator winding 22. On the other hand, for the stator winding 22, which consists of multiple conductors, the higher injection pressure allows the cooling medium to enter the gaps between adjacent conductors, thereby improving the sufficiency and uniformity of cooling of the stator winding 22.

[0113] It should be noted that the cooling component 3 (i.e., the first spray ring 31 and the second spray ring 32) in this embodiment can be integrally formed with the sealing element 5, or it can be a separate molding structure. This is not limited here, and those skilled in the art can adjust it according to actual needs. It is understood that when the cooling component 3 (i.e., the first spray ring 31 and the second spray ring 32) and the sealing element 5 are integrally formed, there will be no joint gap between the cooling component 3 and the sealing element 5, which is beneficial to improving the sealing performance of the first chamber 43 and the second chamber 44. Furthermore, it can simplify the motor assembly process, reduce the motor assembly requirements, and improve the motor assembly efficiency.

[0114] It should be noted that, in order to further improve the sealing effect between the cooling assembly 3 and the housing 1, the stator cooling structure of this embodiment further includes a second sealing ring. The second sealing ring is disposed between the cooling assembly 3 and the housing 1 to achieve a sealed connection between the cooling assembly 3 and the housing 1. In one embodiment, the end of the first spray ring 31 facing away from the first sealing ring 51 and the end of the second spray ring 32 facing away from the second sealing ring 52 are connected to the end plate 11. Two second sealing rings are provided: one second sealing ring is disposed between the first spray ring 31 and the end plate 11, and the other second sealing ring is disposed between the second spray ring 32 and the end plate 11, thereby achieving a sealed connection between the cooling assembly 3 (i.e., the first spray ring 31 and the second spray ring 32) and the housing 1.

[0115] In some optional embodiments of this application, a plurality of first spray holes 311 are provided, and the plurality of first spray holes 311 are spaced apart circumferentially along the first spray ring 31. And / or, the plurality of first spray holes 311 are spaced apart axially along the first spray ring 31.

[0116] In this embodiment, by arranging a plurality of first spray holes 311 circumferentially spaced along the first spray ring 31, and / or arranging a plurality of first spray holes 311 axially spaced along the first spray ring 31, the cooling medium of the first outer chamber 411 can be uniformly sprayed into the first inner chamber 412 from multiple directions. This increases the contact area between the cooling medium and the first end winding 221, thereby further improving the cooling effect of the stator 2. Furthermore, it ensures effective cooling of the entire circumference of the first end winding 221, which is beneficial for improving the cooling uniformity of the stator 2.

[0117] In some optional embodiments of this application, a plurality of second spray holes 321 are provided, and the plurality of second spray holes 321 are spaced apart circumferentially along the second spray ring 32. And / or, the plurality of second spray holes 321 are spaced apart axially along the second spray ring 32.

[0118] In this embodiment, by arranging a plurality of second spray holes 321 circumferentially spaced along the second spray ring 32, and / or arranging a plurality of second spray holes 321 axially spaced along the second spray ring 32, the cooling medium of the second outer chamber 421 can be uniformly sprayed into the second inner chamber 422 from multiple directions. This increases the contact area between the cooling medium and the second end winding 222, thereby further improving the cooling effect of the stator 2. Furthermore, it ensures effective cooling of the second end winding 222 throughout its entire circumference, which is beneficial for improving the cooling uniformity of the stator 2.

[0119] It should be noted that, taking the first spray hole 311 as an example, this application embodiment does not limit the number, size, or spacing of the first spray holes 311, and those skilled in the art can adjust them according to actual needs. It is understood that, provided the first spray ring 31 has sufficient structural strength, increasing the number of first spray holes 311 can improve the spray uniformity of the first spray ring 31 to a certain extent. Therefore, in some embodiments, if multiple first spray holes 311 located on the same circumference are defined as a row of first spray holes 311, those skilled in the art can increase the number of first spray holes 311 by setting multiple rows (greater than or equal to two rows) of first spray holes 311 to improve the spray uniformity of the first spray ring 31, thereby further improving the cooling uniformity of the first end winding 221. The second spray hole 321 is similar and will not be described in detail here. In one embodiment, as shown in FIG10, the first spray holes 311 are arranged in three rows, and the three rows of first spray holes 311 are spaced apart along the axial direction of the stator 2. The second spray hole 321 is provided in three rows, and the three rows of second spray holes 321 are spaced apart along the axial direction of the stator 2.

[0120] In some optional embodiments of this application, the first spray ring 31 extends axially along the stator 2, such that the first outer chamber 411 and the first inner chamber 412 are radially spaced apart along the stator 2. The second spray ring 32 extends axially along the stator 2, such that the second outer chamber 421 and the second inner chamber 422 are radially spaced apart along the stator 2. This allows the first end winding 221 in the first inner chamber 412 and the second end winding 222 in the second inner chamber 422 to fully contact and exchange heat with the fine liquid cooling medium. Furthermore, it allows the first peripheral wall 2111 of the stator core 21 to be completely located in the first inner chamber 412, and the second peripheral wall 2112 to be completely located in the second inner chamber 422, thereby ensuring sufficient contact and heat exchange between the stator core 21 and the fine liquid cooling medium, further improving the cooling effect of the stator 2.

[0121] In some optional embodiments of this application, the housing 1 is provided with a cooling medium channel, which is connected to the first cooling chamber 41 and the second cooling chamber 42 respectively. Specifically, the cooling medium channel includes an inlet channel 14 and an outlet channel 15. The inlet channel 14 is connected to the first outer chamber 411 and the second outer chamber 421 respectively, and the outlet channel 15 is connected to the first inner chamber 412 and the second inner chamber 422 respectively.

[0122] In this embodiment, a cooling medium channel (i.e., inlet channel 14 and outlet channel 15) is provided. The inlet channel 14 is connected to the first outer chamber 411 and the second outer chamber 421, allowing the cooling medium processed by the external cooling device to enter the first outer chamber 411 and the second outer chamber 421. The outlet channel 15 is connected to the first inner chamber 412 and the second inner chamber 422, allowing the cooling medium after heat exchange with the stator 2 to be discharged to the external cooling device for processing. This enables the circulation of the cooling medium, thereby achieving continuous cooling of the stator 2 and improving the cooling effect of the stator 2.

[0123] In some optional embodiments of this application, the liquid inlet channel 14 is disposed on the end plate 11 and / or the first side plate 12; and / or the liquid outlet channel 15 is disposed on the end plate 11 and / or the first side plate 12. By directly integrating the liquid inlet channel 14 onto the end plate 11 and / or the first side plate 12, or directly integrating the liquid outlet channel 15 onto the end plate 11 and / or the first side plate 12, this arrangement not only avoids the inconvenience of pipe connection, but also allows the liquid inlet channel 14 and the liquid outlet channel 15 to be as close as possible to the cooling chamber 4, which is beneficial to improving the cooling effect.

[0124] It should be noted that, taking one inlet channel 14 or outlet channel 15 as an example, there are three ways to set them: (1) only set on the end plate 11, (2) only set on the first side plate 12, (3) set on both the end plate 11 and the first side plate 12. Those skilled in the art can choose according to actual needs. In addition, the embodiments of this application do not limit the number of inlet channels 14 and outlet channels 15. Those skilled in the art can adjust them according to actual needs. In one embodiment, the motor includes two housings 1 that are arranged opposite to each other along the axial direction of the stator 2 and connected to each other. For each housing 1, only one inlet channel 14 and one outlet channel 15 can be set. The inlet channel 14 is connected to the first outer chamber 411 and the second outer chamber 421 respectively, and the outlet channel 15 is connected to the first inner chamber 412 and the second inner chamber 422 respectively.

[0125] In some optional embodiments of this application, as shown in Figures 5 and 6, the liquid inlet channel 14 is disposed on the end plate 11. The liquid inlet channel 14 includes: a liquid inlet 141, a first connecting port 142, and a second connecting port 143. The liquid inlet 141 is used to communicate with an external cooling device. The first connecting port 142 and the second connecting port 143 are arranged radially at intervals along the stator 2. The first connecting port 142 communicates with the first outer chamber 411, and the second connecting port 143 communicates with the second outer chamber 421. The liquid inlet fluid domain A and the liquid spraying fluid domain B are shown in Figure 11.

[0126] In this embodiment, by connecting the inlet 141 and outlet 151 to an external cooling device, the cooling medium can be circulated, thereby continuously cooling the stator 2 and improving the reliability of the motor. Furthermore, because a first connecting port 142 communicating with the first outer chamber 411 and a second connecting port 143 communicating with the second outer chamber 421 are provided, the cooling medium from the cooling device can enter the inlet channel 14 through the inlet 141 and be diverted to the first outer chamber 411 and the second outer chamber 421.

[0127] It should be noted that the specific structure of the liquid inlet channel 14 and the liquid outlet channel 15 is not limited in the embodiments of this application, and those skilled in the art can make adjustments according to actual needs. Taking the liquid inlet channel 14 provided on the end plate 11 as an example, the liquid inlet channel 14 can be a channel formed inside the end plate 11, or it can be a groove formed on the surface of the end plate 11 and can form a channel with the stator core 21. The liquid outlet channel 15 is similar.

[0128] In some optional embodiments of this application, the liquid inlet channel 14 includes a first liquid inlet channel and a second liquid inlet channel; the first liquid inlet channel is connected to the first outer chamber 411; and the second liquid inlet channel is connected to the second outer chamber 421.

[0129] In this embodiment, a first liquid inlet channel and a second liquid inlet channel are provided, with the first liquid inlet channel communicating with the first outer chamber 411 and the second liquid inlet channel communicating with the second outer chamber 421. This simplifies the structure of the liquid inlet channel 14 compared to having a single liquid inlet channel 14 simultaneously communicating with both the first and second outer chambers 411 and 421. Furthermore, providing dedicated liquid inlet channels 14 for each of the two cooling chambers 4 simplifies the process and facilitates the control of the cooling medium flow rate entering the two cooling chambers 4, thereby further improving the cooling effect of the stator 2. Furthermore, the first liquid inlet channel is located on the first side plate 12 or the end plate 11, and the second liquid inlet channel is located on the end plate 11. This facilitates the processing of the first and second liquid inlet channels and simplifies the structure of the housing.

[0130] In some optional embodiments of this application, the liquid outlet channel 15 is disposed on the end plate 11, and the liquid outlet channel 15 includes: a liquid outlet 151, a third connecting port 152 and a fourth connecting port 153; the liquid outlet 151 is used to communicate with an external cooling device; the third connecting port 152 and the fourth connecting port 153 are arranged radially at intervals along the stator 2, the third connecting port 152 communicates with the first inner chamber 412, and the fourth connecting port 153 communicates with the second inner chamber 422, wherein the liquid outlet fluid domain C is shown in Figure 12.

[0131] In this embodiment, by connecting the liquid outlet 151 to an external cooling device, the cooling medium can be circulated, thereby continuously cooling the stator 2 and improving the reliability of the motor. Furthermore, due to the provision of a third connecting port 152 communicating with the first inner chamber 412 and a fourth connecting port 153 communicating with the second inner chamber 422, the cooling medium that has completed heat exchange can flow into the liquid outlet channel 15 and then through the liquid outlet to the external cooling device, thus achieving the circulation of the cooling medium.

[0132] In some optional embodiments of this application, the liquid outlet channel 15 includes a first liquid outlet channel and a second liquid outlet channel; the first liquid outlet channel is connected to the first inner chamber 412; and the second liquid outlet channel is connected to the second inner chamber 422.

[0133] In this embodiment, a first liquid outlet channel and a second liquid outlet channel are used, with the first liquid outlet channel communicating with the first inner chamber 412 and the second liquid outlet channel communicating with the second inner chamber 422. This simplifies the structure of the liquid inlet channel 14 compared to having a single liquid outlet channel 15 simultaneously communicating with both the first and second inner chambers 412 and 422. Furthermore, both the first and second liquid outlet channels are located on the end plate 11, which facilitates the processing of the first and second liquid outlet channels and simplifies the structure of the housing.

[0134] In some optional embodiments of this application, the liquid inlet channel 14 is a liquid inlet hole, and / or the liquid outlet channel 15 is a liquid outlet hole. This further simplifies the structure of the liquid inlet channel 14 and the liquid outlet channel 15, reducing the processing difficulty of the housing 1. In one embodiment, two liquid inlets are provided: one is located on the first side plate 12 to communicate with the first outer chamber 411, and the other is located on the end plate 11 to communicate with the second outer chamber 421. Two liquid outlets are also provided: one is located on the end plate 11 and communicates with the first inner chamber 412, and the other is located on the end plate 11 and communicates with the second inner chamber 422.

[0135] In summary, the stator cooling structure provided in this application embodiment has at least the following advantages:

[0136] In this embodiment, on the one hand, since the housing and stator enclose a cooling chamber, the cooling medium entering the cooling chamber can fully contact and exchange heat with the stator, which is beneficial to improving the cooling effect of the stator. On the other hand, since the cooling assembly divides the cooling chamber into an outer chamber and an inner chamber, when the stator is in contact with the cooling medium located in the inner chamber for heat exchange, as the pressure of the cooling medium in the outer chamber increases, a pressure difference is formed between the outer chamber and the inner chamber. Under the action of the pressure difference, the cooling medium in the outer chamber can enter the inner chamber through the cooling assembly, allowing the cooling medium to circulate fully in the inner chamber, thereby allowing the cooling medium to further fully contact and exchange heat with the stator, which is beneficial to further improving the cooling effect of the stator.

[0137] This application embodiment also provides a stator 2, including the stator cooling structure described above.

[0138] It should be noted that in this embodiment, the structure of the stator cooling structure is the same as that of the stator cooling structure described in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0139] In some optional embodiments of this application, the stator 2 includes: a stator core 21 and a stator winding 22, the stator winding 22 being wound around the stator core 21, at least a portion of the stator winding 22 protruding from the radially outer and radially inner sides of the stator core 21 to form a first end winding 221 and a second end winding 222, respectively, and the cooling assembly 3 is used to cool the first end winding 221 and / or the second end winding 222.

[0140] In practical applications, the stator winding 22 is the main heat-generating component of the stator 2. By setting the cooling assembly 3, the first end winding 221 and / or the second end winding 222 of the stator 2 can be cooled, thereby achieving the cooling of the stator 2.

[0141] In some optional embodiments of this application, the housing 1 includes a first side plate 12 surrounding the stator core 21, with a mounting cavity 16 on the side of the first side plate 12 facing away from the stator core 21; the stator 2 also includes a junction box disposed within the mounting cavity 16, the junction box being used for electrical connection with the stator winding 22. Thus, through the connection between the junction box and the motor controller, and the connection between the motor controller and the power supply, the current in the stator winding 22 can be controlled in real time, achieving real-time control and switching of the motor's operating conditions. Furthermore, by placing the junction box on the side of the first side plate 12 facing away from the stator core 21, i.e., placing the junction box on the periphery of the housing 1, the axial dimension of the motor can be further reduced, which is beneficial for the miniaturization design of the motor.

[0142] In one embodiment, the junction box is electrically connected to the stator winding 22 via lead wires. The first side plate 12 and the first liquid spray ring 31 have through holes at positions corresponding to the first inner chamber 412. Lead wires are passed through these two through holes to connect to the stator winding 22. In another embodiment, the end plate 11 has a through hole at a position corresponding to the first inner chamber 412. Lead wires are passed through these through holes to connect to the stator winding 22. It should be noted that to prevent leakage of the cooling medium from the gap between the lead wires and the through holes, a sealing treatment is required between the lead wires and the through holes, such as by installing a sealing ring.

[0143] This application embodiment also provides a motor, including: a rotating shaft 7, a rotor 6, and the aforementioned stator 2; the rotor 6 and the stator 2 are spaced apart axially on the rotating shaft 7; the rotating shaft 7 passes through the rotor 6 and the stator 2, and is fixedly connected to the rotor 6 and rotatably connected to the stator 2, so that the rotor 6 can rotate relative to the stator 2. Thus, during motor operation, the electromagnetic interaction between the stator 2 and the rotor 6 drives the rotor 6 to rotate and output power. By spaced the rotor 6 and the stator 2, i.e., by having a certain air gap between them, the electromagnetic interaction area can be precisely controlled, reducing leakage flux and reluctance losses, which is beneficial for improving the energy conversion efficiency and output power of the motor.

[0144] It should be noted that in this embodiment, the structure of the stator 2 is the same as that of the stator 2 described in any of the above embodiments, and its beneficial effects are similar, so it will not be described again here. Furthermore, the housing 1 of the stator cooling structure can also serve as the outer casing of the motor, which can further simplify the motor structure and help reduce the cost of the motor. In one embodiment, the housing 1 also includes a bearing chamber, which is disposed on the end plate 11 and located inside the second side plate 13. The bearing chamber is used to install the bearing 8. The bearing 8 is sleeved on the rotating shaft 7, and the outer ring of the bearing 8 is fixedly connected to the inner wall of the bearing chamber, while the inner ring of the bearing 8 is fixedly connected to the rotating shaft 7, so that the rotating shaft 7 can rotate relative to the housing 1. In addition, the motor also includes a position sensor, which is disposed inside the housing 1 and close to the rotating shaft 7, thereby transmitting the motor's position information to the motor controller in real time during motor operation.

[0145] In some alternative embodiments of this application, two stators 2 are provided, and the two stators 2 are provided on opposite axial sides of the rotor 6.

[0146] It should be noted that the accompanying drawings of the embodiments of this application only show the case where the motor is a dual stator 2 / single rotor 6 motor. In actual applications, the motor of the embodiments of this application can also be a single stator 2 / single rotor 6 motor, or an N stator 2 / (N-1) rotor 6 (N>2) motor. There is no limitation here, and those skilled in the art can make adjustments according to actual needs.

[0147] This application also provides a powertrain, including the motor described in any of the above embodiments. The powertrain can be a pure electric powertrain, a hybrid powertrain, or other types, and can be equipped with any drive architecture, such as centralized drive, four-wheel drive, two-wheel drive, wheel-side drive, etc.

[0148] It should be noted that in this embodiment, the structure of the motor is the same as that of the motor described in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0149] This application also provides a vehicle including the aforementioned motor or powertrain.

[0150] It should be noted that in the embodiments of this application, the structure of the motor or powertrain is the same as that of the motor or powertrain described in any of the above embodiments, and its beneficial effects are also similar, so it will not be described in detail here.

[0151] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0152] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A stator cooling structure, characterized in that, include: A housing for accommodating a stator, the housing and the stator enclosing a cooling chamber; And a cooling assembly that divides the cooling chamber into an outer chamber and an inner chamber, through which a cooling medium can enter the inner chamber from the outer chamber.

2. The stator cooling structure according to claim 1, characterized in that, The cooling chamber is provided in two parts, which are arranged radially apart along the stator. The cooling chamber located on the outer side is the first cooling chamber, which is used to cool the radially outer side of the stator. The cooling chamber located on the inner side is the second cooling chamber, which is used to cool the radially inner side of the stator.

3. The stator cooling structure according to claim 2, characterized in that, The stator cooling structure further includes a sealing element disposed within the housing, which, together with the housing and the stator, forms the first cooling chamber and the second cooling chamber.

4. The stator cooling structure according to claim 3, characterized in that, The stator includes a stator core and a stator winding wound around the stator core. At least a portion of the stator winding protrudes radially outward and radially inward from the stator core, forming a first end winding and a second end winding, respectively. The first cooling chamber is used to accommodate the first end winding so that the cooling medium entering the first cooling chamber contacts and exchanges heat with the first end winding. The second cooling chamber is used to accommodate the second end winding so that the cooling medium entering the second cooling chamber contacts and exchanges heat with the second end winding.

5. The stator cooling structure according to claim 4, characterized in that, The sealing element includes a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring being arranged radially apart along the stator and located outside the second sealing ring; the first sealing ring, together with the housing and the stator, forms the first cooling chamber, and the second sealing ring, together with the housing and the stator, forms the second cooling chamber.

6. The stator cooling structure according to claim 5, characterized in that, The sealing element further includes a sealing portion, which is disposed between the first sealing ring and the second sealing ring and is connected to the first sealing ring and the second sealing ring respectively.

7. The stator cooling structure according to claim 6, characterized in that, The stator core has a mounting groove extending radially along the side near the sealing part, which is used to mount the stator winding; the sealing part is a sealing strip, which is adapted to be sealed to the mounting groove.

8. The stator cooling structure according to claim 7, characterized in that, The mounting slots are provided in multiple ways, and the multiple mounting slots are spaced apart along the circumference of the stator core; the sealing strips are provided in multiple ways, and the multiple sealing strips are spaced apart along the circumference of the sealing element, with one sealing strip embedded in one mounting slot.

9. The stator cooling structure according to claim 7 or 8, characterized in that, The first sealing ring, the second sealing ring, and the sealing strip together form an integral molded structure.

10. The stator cooling structure according to claim 3, characterized in that, The sealing element and the cooling assembly together form an integral molded structure.

11. The stator cooling structure according to claim 3, characterized in that, The stator cooling structure further includes a first sealing ring, which is disposed between the sealing element and the housing to make the sealing element and the housing sealed together.

12. The stator cooling structure according to claim 3, characterized in that, The stator cooling structure further includes a second sealing ring, which is disposed between the cooling component and the housing to ensure a sealed connection between the cooling component and the housing.

13. The stator cooling structure according to claim 3, characterized in that, The cooling assembly includes a first cooling element and a second cooling element arranged radially apart along the stator; the first cooling element is disposed in the first cooling chamber to divide the first cooling chamber into a first outer chamber and a first inner chamber, and the cooling medium can enter the first inner chamber from the first outer chamber; the second cooling element is disposed in the second cooling chamber to divide the second cooling chamber into a second outer chamber and a second inner chamber, and the cooling medium can enter the second inner chamber from the second outer chamber.

14. The stator cooling structure according to claim 13, characterized in that, The cooling medium pressure in the first outer chamber is greater than the cooling medium pressure in the first inner chamber, and the cooling medium pressure in the second outer chamber is greater than the cooling medium pressure in the second inner chamber.

15. The stator cooling structure according to claim 13 or 14, characterized in that, The first cooling component is a first liquid spray ring, which is provided with a first liquid spray hole. The first liquid spray hole is used to spray the cooling medium of the first outer chamber into the first inner chamber.

16. The stator cooling structure according to claim 15, characterized in that, The first spray hole is configured as a plurality of holes, which are spaced apart along the circumferential and / or axial direction of the first spray ring.

17. The stator cooling structure according to claim 15, characterized in that, The first spray ring extends along the axial direction of the stator so that the first outer chamber and the first inner chamber are distributed radially apart along the stator.

18. The stator cooling structure according to claim 13 or 14, characterized in that, The second cooling component is a second liquid spray ring, which is provided with a second liquid spray hole. The second liquid spray hole is used to spray the cooling medium of the second outer chamber into the second inner chamber.

19. The stator cooling structure according to claim 18, characterized in that, The second spray hole is provided in multiple ways, and the multiple second spray holes are spaced apart along the circumferential and / or axial direction of the second spray ring.

20. The stator cooling structure according to claim 18, characterized in that, The second spray ring extends along the axial direction of the stator so that the second outer chamber and the second inner chamber are distributed radially apart along the stator.

21. The stator cooling structure according to claim 13, characterized in that, The housing includes an end plate, a first side plate, and a second side plate. The end plate is disposed at the end of the stator away from the seal. The first side plate and the second side plate extend circumferentially along the end plate and are spaced apart radially from the stator. The first side plate is located outside the second side plate. The end plate, the first side plate, the seal, and the stator together form a first cooling chamber, and the end plate, the second side plate, the seal, and the stator together form a second cooling chamber.

22. The stator cooling structure according to claim 21, characterized in that, The housing is provided with a cooling medium channel, which is connected to the first cooling chamber and the second cooling chamber respectively.

23. The stator cooling structure according to claim 22, characterized in that, The cooling medium channel includes an inlet channel and an outlet channel. The inlet channel is connected to the first outer chamber and the second outer chamber, respectively, and the outlet channel is connected to the first inner chamber and the second inner chamber, respectively.

24. The stator cooling structure according to claim 23, characterized in that, The liquid inlet channel is disposed on the end plate and / or the first side plate; and / or, the liquid outlet channel is disposed on the end plate and / or the first side plate.

25. The stator cooling structure according to claim 24, characterized in that, The liquid inlet channel is disposed on the end plate, and the liquid inlet channel includes: a liquid inlet, a first connecting port and a second connecting port; the liquid inlet is used to communicate with an external cooling device; the first connecting port and the second connecting port are arranged radially spaced along the stator, the first connecting port communicates with the first outer chamber, and the second connecting port communicates with the second outer chamber.

26. The stator cooling structure according to claim 24, characterized in that, The liquid inlet channel includes a first liquid inlet channel and a second liquid inlet channel; the first liquid inlet channel is connected to the first outer chamber; and the second liquid inlet channel is connected to the second outer chamber.

27. The stator cooling structure according to claim 26, characterized in that, The first liquid inlet channel is disposed on the first side plate or the end plate, and the second liquid inlet channel is disposed on the end plate.

28. The stator cooling structure according to any one of claims 23-27, characterized in that, The liquid outlet channel is disposed on the end plate, and the liquid outlet channel includes: a liquid outlet, a third connecting port and a fourth connecting port; the liquid outlet is used to communicate with an external cooling device; the third connecting port and the fourth connecting port are arranged radially spaced along the stator, the third connecting port communicates with the first inner cavity, and the fourth connecting port communicates with the second inner cavity.

29. The stator cooling structure according to claim 24, characterized in that, The liquid inlet channel is a liquid inlet hole, and / or the liquid outlet channel is a liquid outlet hole.

30. A stator, characterized in that, include: The stator cooling structure according to any one of claims 1-29.

31. The stator according to claim 30, characterized in that, The stator includes a stator core and a stator winding, the stator winding being wound around the stator core, at least a portion of the stator winding protruding from the radially outer and radially inner sides of the stator core to form a first end winding and a second end winding, respectively, and the cooling assembly is used to cool the first end winding and / or the second end winding.

32. The stator according to claim 31, characterized in that, The housing includes: a first side plate surrounding the stator core, the side plate opposite to the stator core having a mounting cavity; the stator also includes a junction box disposed within the mounting cavity, the junction box being used for electrical connection with the stator winding.

33. An electric motor, characterized in that, include: A rotating shaft, a rotor, and a stator as described in any one of claims 30-32; the rotor and the stator are spaced apart axially from each other on the rotating shaft; the rotating shaft passes through the rotor and the stator, the rotating shaft is fixedly connected to the rotor and rotatably connected to the stator, so that the rotor can rotate relative to the stator.

34. The motor according to claim 33, characterized in that, The stator is provided in two parts, which are arranged on opposite sides of the rotor along the axial direction.

35. A powertrain, characterized in that, Includes the motor described in claim 33 or 34.

36. A vehicle, characterized in that, This includes the motor as described in claim 33 or 34, or the powertrain as described in claim 35.

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