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

Abstract

The invention relates to the technical field of vehicles, in particular to a stator cooling structure, a stator, a motor, a power assembly and a vehicle. The stator cooling structure comprises a shell and a cooling assembly, a cooling cavity is defined by the shell and a stator, and the shell is provided with a cooling medium channel; the cooling medium channel is communicated with the cooling cavity through the cooling assembly. Wherein a cooling chamber is defined by the shell and the stator, and the stator can be in direct contact with a cooling medium in the cooling chamber. Therefore, according to the stator cooling structure provided by the embodiment of the invention, the stator can be in direct contact with the cooling medium for heat exchange, and the heat of the stator is brought out of the motor through the circulation of the cooling medium, so that the stator is cooled. Compared with an indirect cooling stator structure, the direct contact heat exchange structure of the stator and the cooling medium can significantly improve the cooling effect of the stator.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to a stator cooling structure, a stator, a motor, a powertrain, and a vehicle. Background Technology

[0002] The electric motor is a core component of a vehicle, driving it. Axial flux motors, as a type of electric motor, are widely used. Axial flux motors generate considerable heat during operation. To improve the efficiency of axial flux motors, cooling of the stator is necessary.

[0003] In existing technologies, a cooling mechanism is installed on the axial flux motor, and a heat-conducting component transfers heat from the stator to the cooling mechanism for cooling. However, the cooling medium in this type of cooling mechanism often fails to make sufficient contact with the stator for heat exchange, resulting in poor cooling performance of the stator. Summary of the Invention

[0004] This invention provides a stator cooling structure, a stator, a motor, a powertrain, and a vehicle to solve the technical problem of poor stator cooling effect in the prior art.

[0005] In a first aspect, embodiments of the present invention provide a stator cooling structure, the stator cooling structure including a housing and a cooling assembly, the housing being used to accommodate a stator, the housing and the stator enclosing each other to form a cooling chamber, the housing being provided with a cooling medium channel; the cooling medium channel communicating with the cooling chamber through the cooling assembly.

[0006] Optionally, the cooling chamber includes a first cooling chamber and a second cooling chamber along the radial direction of the stator. The first cooling chamber is located outside the second cooling chamber. The first cooling chamber is used to cool the radially outer side of the stator, and the second cooling chamber is used to cool the radially inner side of the stator.

[0007] Optionally, the cooling assembly includes a first cooling assembly and a second cooling assembly, wherein the first cooling assembly and the second cooling assembly are arranged radially apart along the stator;

[0008] The first cooling component is disposed within the first cooling chamber, and the first cooling component connects the cooling medium channel and the first cooling chamber;

[0009] The second cooling component is disposed in the second cooling chamber, and the second cooling component connects the cooling medium channel and the second cooling chamber.

[0010] Optionally, the first cooling assembly includes a first spray pipe, which is arranged around the axis of the stator, and the first spray pipe is provided with a first spray port communicating with the first cooling chamber.

[0011] Optionally, the second cooling assembly includes a second spray pipe, which is arranged around the axis of the stator, and has a second spray port communicating with the second cooling chamber.

[0012] Optionally, at least two first spray pipes are provided, and the at least two first spray pipes are spaced apart along the axial direction of the stator; and / or,

[0013] The second spray pipe is provided in at least two, and the at least two second spray pipes are arranged at intervals along the axial direction of the stator.

[0014] Optionally, multiple first spray nozzles are provided, and the multiple first spray nozzles are arranged at intervals along the circumference of the first spray pipe; and / or,

[0015] The second spray nozzle is provided in multiple ways, and the multiple second spray nozzles are arranged at intervals along the circumference of the second spray pipe.

[0016] Optionally, the second cooling assembly includes a second guide ring that divides the second cooling chamber into a second outer chamber and a second inner chamber. The second outer chamber is connected to the cooling medium channel, and the second inner chamber is used to cool the radially inner side of the stator.

[0017] The second guide ring is provided with a second guide hole, which connects the second outer chamber and the second inner chamber.

[0018] Optionally, the second guide ring extends along the axial direction of the stator so that the second outer cavity and the second inner cavity are distributed radially spaced along the stator; or, the second guide ring extends radially along the stator so that the second outer cavity and the second inner cavity are distributed axially spaced along the stator.

[0019] Optionally, the second guide hole is provided as a plurality of holes, which are spaced apart circumferentially along the second guide ring; and / or, the plurality of second guide holes are spaced apart axially along the second guide ring; and / or, the plurality of second guide holes are spaced apart radially along the second guide ring.

[0020] Optionally, the first cooling assembly includes a first guide ring that divides the first cooling chamber into a first outer chamber and a first inner chamber. The first outer chamber is connected to the cooling medium channel, and the first inner chamber is used to cool the radially inner side of the stator.

[0021] The first guide ring is provided with a first guide hole, which connects the first outer chamber and the first inner chamber.

[0022] Optionally, the first guide ring extends along the axial direction of the stator so that the first outer chamber and the first inner chamber are distributed radially spaced along the stator; or, the first guide ring extends radially along the stator so that the first outer chamber and the first inner chamber are distributed axially spaced along the stator.

[0023] Optionally, the first guide hole is provided in multiple ways, and the multiple first guide holes are arranged circumferentially at intervals along the first guide ring; and / or, the multiple first guide holes are arranged axially at intervals along the first guide ring; and / or, the multiple first guide holes are arranged radially at intervals along the first guide ring.

[0024] Optionally, the second cooling assembly includes a second spray pipe, which is arranged around the axis of the stator, and has a second spray port communicating with the second cooling chamber.

[0025] Optionally, at least two second spray pipes are provided, and the at least two second spray pipes are spaced apart along the axial direction of the stator.

[0026] 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.

[0027] Optionally, the sealing element includes a first sealing portion and a second sealing portion connected to each other, wherein the first sealing portion, the housing, and the stator enclose to form a first cooling chamber, and the first sealing portion, the second sealing portion, the housing, and the stator enclose to form a second cooling chamber.

[0028] Optionally, the first sealing part is an annular structure extending radially along the stator, with the outer end of the first sealing part connected to the housing and the inner end of the first sealing part connected to the second sealing part.

[0029] Optionally, the stator includes a stator core and a stator winding wound around the stator core, wherein the stator winding at least partially protrudes from the radially outer and radially inner sides of the stator core to form a first end winding and a second end winding.

[0030] The first cooling chamber is used to house the first end winding and to cool the first end winding; the second cooling chamber is used to house the second end winding and to cool the second end winding.

[0031] Optionally, the stator core is provided with a mounting groove extending radially along the stator core on the side near the first sealing part, the mounting groove being used to install the stator winding;

[0032] The first sealing part includes a sealing strip, which is adapted to be in a sealing connection with the mounting groove.

[0033] Optionally, multiple mounting slots are provided, and the multiple mounting slots are spaced apart along the circumference of the stator core;

[0034] Multiple sealing strips are provided, and the multiple sealing strips are spaced apart along the circumference of the first sealing part, with one sealing strip embedded in one mounting groove.

[0035] Optionally, the second sealing part is a hollow cylindrical structure extending along the axial direction of the stator;

[0036] Along the axial direction of the stator, one end of the second sealing part is connected to the inner end of the first sealing part, and the other end of the second sealing part is connected to the housing.

[0037] Optionally, the first sealing part and the second sealing part can be integrally formed into a single structure.

[0038] Optionally, the stator cooling structure further includes a first sealing ring disposed between the seal and the housing to ensure a sealed connection between the seal and the housing.

[0039] Optionally, the stator cooling structure further includes a second sealing ring;

[0040] The first cooling assembly includes a first guide ring connected to the housing, the first guide ring dividing the first cooling chamber into a first inner chamber and a first outer chamber, and a second sealing ring disposed between the first guide ring and the housing to provide a sealed connection between the first guide ring and the housing; or...

[0041] The second cooling assembly includes a second guide ring connected to the housing, the second guide ring dividing the second cooling chamber into a second inner chamber and a second outer chamber, and a second sealing ring disposed between the second guide ring and the housing to provide a sealed connection between the second guide ring and the housing.

[0042] Optionally, the first guide ring is connected to the sealing element, and the first guide ring and the sealing element together form an integrally molded structure; or,

[0043] The second guide ring is connected to the seal, and the second guide ring and the seal together form an integral structure.

[0044] Optionally, the housing includes:

[0045] An end plate, wherein the end plate is disposed on the side of the stator away from the seal;

[0046] A side plate extends along the axial direction of the stator, and one end of the side plate is connected to the outer peripheral end of the end plate;

[0047] The end plate, the side plate, the seal, and the outer radial side of the stator form the first cooling chamber, and the end plate, the seal, and the inner radial side of the stator form the second cooling chamber.

[0048] Optionally, the cooling medium channel includes a cooling medium inlet channel and a cooling medium outlet channel;

[0049] The cooling medium inlet channel is connected to the first cooling chamber and the second cooling chamber respectively;

[0050] The cooling medium outflow channel is connected to the first cooling chamber and the second cooling chamber, respectively.

[0051] Optionally, the cooling medium inlet channel is disposed on the end plate and / or the side plate; and / or,

[0052] The cooling medium outflow channel is provided on the end plate and / or the side plate.

[0053] Optionally, the cooling medium inlet channel is disposed on the end plate, and the cooling medium inlet channel includes: a liquid inlet, a first connecting port, and a second connecting port;

[0054] The liquid inlet is used to connect with an external cooling device;

[0055] The first communication port and the second communication port are arranged radially apart along the stator. The first communication port is connected to the first cooling chamber through the first cooling component, and the second communication port is connected to the second cooling chamber through the second cooling component.

[0056] Optionally, the cooling medium inlet channel includes a plurality of sub-inlet channels, the sub-inlet channels having a straight segment structure, and each sub-inlet channel intersects with and is connected to at least one other sub-inlet channel;

[0057] One end of a portion of the sub-entry channel is located at the outer peripheral end of the end plate and is closed, while the remaining end of the sub-entry channel is located at the outer peripheral end of the end plate and forms the liquid inlet;

[0058] At least one of the sub-entry channels is configured with the first connection port, and at least one of the sub-entry channels is configured with the second connection port.

[0059] Optionally, the cooling medium outflow channel is disposed on the end plate, and the cooling medium outflow channel includes: a liquid outlet, a third connecting port and a fourth connecting port;

[0060] The liquid outlet is used to connect with an external cooling device;

[0061] The third and fourth communication ports are arranged radially apart along the stator. The third communication port communicates with the first cooling chamber, and the fourth communication port communicates with the second cooling chamber.

[0062] Optionally, the cooling medium outlet channel has a groove-shaped structure that extends radially along the stator; along the radial direction of the stator, the stator blocks the middle part of the groove opening of the cooling medium outlet channel, and the two ends of the groove opening of the cooling medium outlet channel are the third connecting port and the fourth connecting port, respectively.

[0063] Optionally, the cooling medium inlet channel is a liquid inlet, and / or the cooling medium outlet channel is a liquid outlet.

[0064] Secondly, embodiments of the present invention also provide a stator, the stator including the stator cooling structure as described above.

[0065] Optionally, the stator includes a stator core and a stator winding, the stator winding being wound around the stator core. Along the radial direction of the stator core, a portion of the stator winding protrudes radially outward from the stator core to form a first end winding, and a portion of the stator winding protrudes radially inward from the stator core to form a second end winding.

[0066] Optionally, the housing is provided with a wiring cavity, which is located on the side of the side plate away from the stator winding. The stator also includes a junction box, which is located inside the wiring cavity. The junction box is used to connect the leads of the first end winding and / or the second end winding.

[0067] Thirdly, embodiments of the present invention also provide an electric motor, the electric motor including the stator as described above.

[0068] Optionally, the motor further includes a rotating shaft and a rotor, the rotor being along the axial direction of the rotating shaft, the stator and the rotor being spaced apart, the rotor being fixedly connected to the rotating shaft; the stator being rotatably connected to the rotating shaft so that the rotor can rotate relative to the stator.

[0069] Optionally, the stator comprises two, with one stator disposed on one side of the rotor and the other stator disposed on the other side of the rotor along the axial direction of the stator.

[0070] Fourthly, embodiments of the present invention also provide a powertrain, which includes the motor as described above.

[0071] Fifthly, embodiments of the present invention also provide a vehicle, the vehicle including the motor as described above, or including the powertrain as described above.

[0072] Compared with prior art, the present invention has the following advantages:

[0073] In the stator cooling structure of this embodiment, the housing and at least a portion of the stator enclose a cooling chamber, with at least a portion of the stator directly contacting the cooling medium within the cooling chamber. Therefore, in this stator cooling structure, at least a portion of the stator directly contacts the cooling medium for heat exchange, and the heat from the stator is carried away to the outside of the motor through the circulation of the cooling medium, thereby achieving stator cooling. This structure, where the stator directly contacts the cooling medium for heat exchange, significantly improves the stator cooling effect compared to structures that indirectly cool the stator.

[0074] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0075] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0076] Figure 1 This is a schematic diagram of the structure of the housing provided in an embodiment of the present invention;

[0077] Figure 2 This is a structural schematic diagram of an exploded view of the shell provided in an embodiment of the present invention;

[0078] Figure 3 This is a schematic diagram of the stator structure provided in an embodiment of the present invention;

[0079] Figure 4 This is a schematic diagram of the stator core structure provided in an embodiment of the present invention;

[0080] Figure 5 This is a schematic diagram of the stator winding structure provided in an embodiment of the present invention;

[0081] Figure 6A partial exploded view of the motor provided in an embodiment of the present invention. Figure 1 ;

[0082] Figure 7 Schematic diagram of the sealing element and cooling assembly of the stator cooling structure provided in the embodiments of the present invention. Figure 1 ;

[0083] Figure 8 Schematic diagram of the liquid inlet fluid domain and liquid spray fluid domain of the stator cooling structure provided in the embodiments of the present invention. Figure 1 ;

[0084] Figure 9 A partial cross-sectional view of the motor provided in an embodiment of the present invention. Figure 1 ;

[0085] Figure 10 A partial cross-sectional view of the motor provided in an embodiment of the present invention. Figure 2 ;

[0086] Figure 11 A partial exploded view of the motor provided in an embodiment of the present invention. Figure 2 ;

[0087] Figure 12 Schematic diagram of the sealing element and cooling assembly of the stator cooling structure provided in the embodiments of the present invention. Figure 2 ;

[0088] Figure 13 Schematic diagram of the liquid inlet fluid domain and liquid spray fluid domain of the stator cooling structure provided in the embodiments of the present invention. Figure 2 ;

[0089] Figure 14 Schematic diagram of the liquid inlet fluid domain and liquid spray fluid domain of the stator cooling structure provided in the embodiments of the present invention. Figure 3 ;

[0090] Figure 15 A partial cross-sectional view of the motor provided in an embodiment of the present invention. Figure 3 ;

[0091] Figure 16 A partial cross-sectional view of the motor provided in an embodiment of the present invention. Figure 4 .

[0092] Figure label:

[0093] 10. Seal; 11. Cooling chamber; 111. First cooling chamber; 112. Second cooling chamber; 113. First outer chamber; 114. First inner chamber; 12. First sealing part; 121. First sub-sealing part; 122. Second sub-sealing part; 123. Third sub-sealing part; 13. Second sealing part;

[0094] 20. Cooling assembly; 21. First spray pipe; 211. First spray nozzle; 22. Second spray pipe; 221. Second spray nozzle; 23. First guide ring; 231. First guide hole;

[0095] 30. Cooling medium inlet channel; 301. Liquid inlet; 302. First connecting port; 31. Cooling medium outlet channel; 312. Liquid outlet;

[0096] 40. Housing; 401. End plate; 402. Side plate; 403. Bearing chamber; 41. Stator; 411. Stator core; 412. Stator winding; 413. Mounting slot; 42. Wiring cavity; 43. Shaft; 44. Bearing; 46. First end winding; 47. Second end winding; 48. Middle winding;

[0097] 50. Rotor;

[0098] 61. Liquid inlet fluid domain; 62. Liquid spraying fluid domain. Detailed Implementation

[0099] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0100] Reference Figures 1 to 16 , Figure 1 This is a schematic diagram of the structure of the housing provided in an embodiment of the present invention; Figure 2 This is a structural schematic diagram of an exploded view of the shell provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the stator structure provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the stator core structure provided in an embodiment of the present invention;

[0101] Figure 5 This is a schematic diagram of the stator winding structure provided in an embodiment of the present invention; Figure 6 A partial exploded view of the motor provided in an embodiment of the present invention. Figure 1 ; Figure 7 Schematic diagram of the sealing element and cooling assembly of the stator cooling structure provided in the embodiments of the present invention. Figure 1 ; Figure 8 Schematic diagram of the liquid inlet fluid domain and liquid spray fluid domain of the stator cooling structure provided in the embodiments of the present invention. Figure 1 ; Figure 9 A partial cross-sectional view of the motor provided in an embodiment of the present invention. Figure 1 ; Figure 10 A partial cross-sectional view of the motor provided in an embodiment of the present invention. Figure 2 ; Figure 11 A partial exploded view of the motor provided in an embodiment of the present invention. Figure 2 ; Figure 12 Schematic diagram of the sealing element and cooling assembly of the stator cooling structure provided in the embodiments of the present invention. Figure 2 ; Figure 13 Schematic diagram of the liquid inlet fluid domain and liquid spray fluid domain of the stator cooling structure provided in the embodiments of the present invention. Figure 2 ; Figure 14 Schematic diagram of the liquid inlet fluid domain and liquid spray fluid domain of the stator cooling structure provided in the embodiments of the present invention. Figure 3 ; Figure 15 A partial cross-sectional view of the motor provided in an embodiment of the present invention. Figure 3 ; Figure 16 A partial cross-sectional view of the motor provided in an embodiment of the present invention. Figure 4 .

[0102] like Figures 1 to 16 As shown in the figure, this application discloses a stator cooling structure, which includes a housing 40 and a cooling assembly 20; wherein, the housing 40 is used to accommodate the stator 41, and the housing 40 and the stator 41 enclose a cooling chamber 11, and the housing 40 is provided with a cooling medium channel; the cooling medium channel is connected to the cooling chamber 11 through the cooling assembly 20.

[0103] When the stator cooling structure is in use, the cooling medium channel is used to connect with the external cooling device, and the cooling medium enters the cooling chamber 11 in sequence through the cooling medium channel and the cooling component 20.

[0104] In this embodiment, the housing 40 and the stator 41 enclose a cooling chamber 11, with the stator 41 in direct contact with the cooling medium within the cooling chamber 11. Therefore, in this stator cooling structure, the stator 41 directly contacts the cooling medium for heat exchange, and the heat from the stator 41 is carried away to the outside of the motor through the circulation of the cooling medium, thus achieving cooling of the stator 41. Compared to structures that indirectly cool the stator 41, this structure, where the stator 41 directly contacts the cooling medium for heat exchange, significantly improves the cooling effect on the stator 41.

[0105] Understandably, when the cooling effect of stator 41 is improved, on the one hand, the overall temperature of the motor decreases, which can increase the permanent magnet flux linkage and output torque of the motor, thereby increasing the torque density and efficiency of the motor. On the other hand, the current flowing through stator 41 [specifically, the current flowing through stator winding 412 of stator 41] 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. In addition, compared with the structure of indirect cooling of stator 41, the stator cooling structure of this application embodiment adopts direct cooling, that is, stator 41 is in direct contact with the cooling medium. While improving the cooling effect, it can also save space. Under the condition of meeting the same torque and power, the size and weight of the motor using the stator cooling structure of this application embodiment can be designed to be smaller, which is beneficial to the space layout of the motor and the whole vehicle, and also beneficial to the lightweighting of the vehicle.

[0106] The cooling medium in this embodiment includes cooling oil, which serves both to cool the stator 41 and to lubricate it. It is understood that the above are merely examples of cooling media and are not intended to limit the range of cooling media. In practical applications, those skilled in the art can select the appropriate cooling medium as needed.

[0107] In some embodiments, the cooling chamber 11 includes a first cooling chamber 111 and a second cooling chamber 112. Along the radial direction of the stator 41, the first cooling chamber 111 is located outside the second cooling chamber 112. The first cooling chamber 111 is used to cool the radially outer side of the stator 41, and the second cooling chamber 112 is used to cool the radially inner side of the stator 41.

[0108] In this embodiment of the application, the cooling chamber 11 includes a first cooling chamber 111 and a second cooling chamber 112. After the cooling medium is introduced into the cooling chamber 11, the cooling medium in the first cooling chamber 111 can cool the radial outer side of the stator 41, and the cooling medium in the second cooling chamber 112 can cool the radial inner side of the stator 41. The first cooling chamber 111 and the second cooling chamber 112 can increase the contact heat exchange area between the cooling medium and the stator 41, which is beneficial to improving the cooling effect of the stator 41.

[0109] In some embodiments, the cooling assembly 20 includes a first cooling assembly 20 and a second cooling assembly 20, which are arranged radially apart along the stator 41; the first cooling assembly 20 is disposed in a first cooling chamber 111 and connects the cooling medium channel and the first cooling chamber 111; the second cooling assembly 20 is disposed in a second cooling chamber 112 and connects the cooling medium channel and the second cooling chamber 112.

[0110] In this embodiment, the cooling medium delivered by the cooling device enters the cooling medium channel and then enters the first cooling chamber 111 through the first cooling component 20 and the second cooling chamber 112 through the second cooling component 20. The stator cooling structure, through the first and second cooling components 20, separately delivers the cooling medium to the first cooling chamber 111 and the second cooling chamber 112, cooling the radially outer and radially inner sides of the stator 41 respectively, which helps to further improve the cooling effect of the stator 41.

[0111] In some embodiments, the first cooling assembly 20 includes a first spray pipe 21, which is arranged around the axis of the stator 41, and the first spray pipe 21 is provided with a first spray port 211 communicating with the first cooling chamber 111.

[0112] Reference Figure 12 As shown, the first spray pipe 21 is an annular pipe arranged around the axis of the stator 41. The first spray pipe 21 is connected to the cooling medium channel. The cooling medium supplied by the cooling device enters the cooling medium channel and then enters the first spray pipe 21, and is sprayed out into the first cooling chamber 111 through the first spray nozzle 211. The cooling medium entering the first cooling chamber 111 contacts and exchanges heat with the radial outer side of the stator 41.

[0113] In some embodiments, at least two first spray pipes 21 are provided, and the at least two first spray pipes 21 are spaced apart along the axial direction of the stator 41. In this case, more cooling medium can be sprayed into the first cooling chamber 111, effectively improving the cooling effect on the stator 41.

[0114] In some embodiments, multiple first spray nozzles 211 are provided, and the multiple first spray nozzles 211 are arranged at intervals along the circumference of the first spray pipe 21, so that the cooling medium of the first spray pipe 21 can be uniformly sprayed into the first cooling chamber 111 from multiple directions. On the one hand, it can increase the contact area between the cooling medium and the stator 41, thereby further improving the cooling effect of the stator 41. On the other hand, it can ensure that all parts of the radially outer side of the stator 41 are effectively cooled, which is beneficial to improving the cooling uniformity of the stator 41.

[0115] It should be noted that the embodiments of this application do not limit the number, size, or spacing of the first spray nozzles 211, and those skilled in the art can adjust these parameters according to actual needs. It is understood that, provided the first spray nozzles 211 have sufficient structural strength, increasing the number of first spray nozzles 211 can improve the spray uniformity of the first spray pipe 21 to a certain extent. Therefore, in some embodiments, if multiple first spray nozzles 211 located on the same circumference are defined as a row of first spray nozzles 211, those skilled in the art can increase the number of first spray nozzles 211 by setting multiple rows of first spray nozzles 211 to improve the spray uniformity of the first spray pipe 21, thereby further improving the cooling uniformity of the stator 41.

[0116] In some embodiments, the second cooling assembly 20 includes a second spray pipe 22, which is arranged around the axis of the stator 41, and the second spray pipe 22 is provided with a second spray port 221 that communicates with the second cooling chamber 112.

[0117] Reference Figure 12 As shown, the second spray pipe 22 is an annular pipe arranged around the axis of the stator 41. The second spray pipe 22 is connected to the cooling medium channel. The cooling medium supplied by the cooling device enters the cooling medium channel and then enters the second spray pipe 22, and is sprayed out into the second cooling chamber 112 through the second spray nozzle 221. The cooling medium entering the second cooling chamber 112 contacts and exchanges heat with the radial inner side of the stator 41.

[0118] In some embodiments, at least two second spray pipes 22 are provided, and the at least two second spray pipes 22 are spaced apart along the axial direction of the stator 41. In this case, more cooling medium can be sprayed into the second cooling chamber 112, effectively improving the cooling effect on the stator 41.

[0119] In some embodiments, multiple second spray nozzles 221 are provided, and the multiple second spray nozzles 221 are arranged at intervals along the circumference of the second spray pipe 22, so that the cooling medium of the second spray pipe 22 can be uniformly sprayed into the second cooling chamber 112 from multiple directions. On the one hand, it can increase the contact area between the cooling medium and the stator 41, thereby further improving the cooling effect of the stator 41. On the other hand, it can ensure that all parts of the radially outer side of the stator 41 are effectively cooled, which is beneficial to improving the cooling uniformity of the stator 41.

[0120] It should be noted that the embodiments of this application do not limit the number, size, or spacing of the second spray nozzles 221, and those skilled in the art can adjust these parameters according to actual needs. It is understood that, provided the second spray nozzles 221 have sufficient structural strength, increasing the number of second spray nozzles 221 can improve the spray uniformity of the second spray pipe 22 to a certain extent. Therefore, in some embodiments, if multiple second spray nozzles 221 located on the same circumference are defined as a row of second spray nozzles 221, those skilled in the art can increase the number of second spray nozzles 221 by setting multiple rows of second spray nozzles 221 to improve the spray uniformity of the second spray pipe 22, thereby further improving the cooling uniformity of the stator 41.

[0121] In some embodiments, the first cooling assembly 20 includes a first guide ring 23, which divides the first cooling chamber 111 into a first outer chamber 113 and a first inner chamber 114. The first outer chamber 113 is connected to a cooling medium channel, and the first inner chamber 114 is used to cool the radially outer side of the stator 41. The first guide ring 23 is provided with a plurality of first guide holes 231, which connect the first outer chamber 113 and the first inner chamber 114.

[0122] Reference Figure 7 and Figure 10 As shown, the first outer chamber 113 is connected to the cooling medium channel. The cooling medium delivered by the cooling device enters the cooling medium channel and then enters the first outer chamber 113. It is then sprayed out into the first inner chamber 114 through the first guide hole 231. The cooling medium entering the first inner chamber 114 contacts and exchanges heat with the radial outer side of the stator 41.

[0123] In some embodiments, the first guide ring 23 extends axially along the stator 41 so that the first outer chamber 113 and the first inner chamber 114 are distributed radially spaced along the stator 41, with the first outer chamber 113 located radially outside the first inner chamber 114 of the stator 41; or, the first guide ring 23 extends radially along the stator 41 so that the first outer chamber 113 and the first inner chamber 114 are distributed axially spaced along the stator.

[0124] The first guide ring 23 extends radially along the stator 41 so that the first outer chamber 113 and the first inner chamber 114 are spaced apart along the axial direction of the stator. This allows the housing 40 to be positioned as close as possible to the stator 41, thereby reducing the radial dimension of the motor and facilitating its miniaturization.

[0125] In some embodiments, a plurality of first guide holes 231 are spaced apart circumferentially along the first guide ring 23; and / or, a plurality of first guide holes 231 are spaced apart axially along the first guide ring 23; and / or, a plurality of first guide holes 231 are spaced apart radially along the first guide ring 23.

[0126] In this embodiment, by arranging multiple first guide holes 231 at circumferential intervals along the first guide ring 23, the cooling medium in the first outer chamber 113 can be uniformly sprayed into the first inner chamber 114 from multiple directions. On the one hand, this increases the contact area between the cooling medium and the stator 41, thereby further improving the cooling effect of the stator 41. On the other hand, it ensures that all parts of the radially outer side of the stator 41 receive effective cooling, which is beneficial to improving the cooling uniformity of the stator 41.

[0127] It should be noted that the embodiments of this application do not limit the number, size, or spacing of the first guide holes 231, and those skilled in the art can adjust them according to actual needs. It is understood that, provided the first guide ring 23 has sufficient structural strength, increasing the number of first guide holes 231 can improve the uniformity of liquid spraying of the first guide ring 23 to a certain extent. Therefore, in some embodiments, if multiple first guide holes 231 located on the same circumference are defined as a row of first guide holes 231, those skilled in the art can increase the number of first guide holes 231 by setting multiple rows of first guide holes 231, that is, by arranging multiple first guide holes 231 axially spaced along the first guide ring 23 and multiple first guide holes 231 radially spaced along the first guide ring 23, to improve the uniformity of liquid spraying of the first guide ring 23, thereby further improving the cooling uniformity of the stator 41.

[0128] In some optional embodiments of this application, when the stator cooling structure is used, the pressure of the cooling medium in the first outer chamber 113 is greater than the pressure of the cooling medium in the first inner chamber 114. That is, there is a pressure difference between the first outer chamber 113 and the first inner chamber 114, which allows the cooling medium to be sprayed into the first inner chamber 114 at a higher spray pressure. On the one hand, the higher spray pressure can make the sprayed cooling medium finer, thereby further increasing the contact area between the cooling medium and the stator winding 412. On the other hand, for the stator winding 412, which is composed of multiple wires in the stator 41, the higher spray pressure can allow the cooling medium to enter the gaps between adjacent wires, thereby improving the sufficiency and uniformity of cooling of the stator winding 412.

[0129] It should be noted that the embodiments of this application do not limit the cooling medium pressure of the first outer chamber 113 and the first inner chamber 114. Those skilled in the art can adjust it according to actual needs, such as the required injection pressure.

[0130] In some embodiments, the second cooling assembly 20 includes a second flow guide ring. [It should be noted that this arrangement is not shown in the accompanying drawings of this application embodiment; however, it can be referred to...] Figures 7 to 10 The first guide ring 23 is adjusted. The second guide ring divides the second cooling chamber 112 into a second outer chamber and a second inner chamber. The second outer chamber is connected to the cooling medium channel, and the second inner chamber is used to cool the radial inner side of the stator 41. The second guide ring is provided with a plurality of second guide holes, which are connected to the second outer chamber and the second inner chamber.

[0131] The second outer chamber is connected to the cooling medium channel. The cooling medium delivered by the cooling device enters the cooling medium channel and then enters the second outer chamber. It is then sprayed out into the second inner chamber through the second guide hole. The cooling medium entering the second inner chamber contacts and exchanges heat with the radial inner side of the stator 41.

[0132] In some embodiments, the second guide ring extends along the axial direction of the stator 41 so that the second outer chamber and the second inner chamber are distributed radially spaced along the stator 41, with the second outer chamber located outside the second inner chamber in the radial direction of the stator 41.

[0133] In some embodiments, the second guide ring extends radially along the stator 41 so that the second outer chamber and the second inner chamber are spaced apart axially along the stator 41. This allows the housing 40 to be positioned as close as possible to the stator 41, thereby reducing the radial dimension of the motor and facilitating motor miniaturization.

[0134] In some embodiments, a plurality of second guide holes are spaced apart circumferentially along the second guide ring; and / or, a plurality of second guide holes are spaced apart axially along the second guide ring; and / or, a plurality of second guide holes are spaced apart radially along the second guide ring.

[0135] In this embodiment, by arranging multiple second guide holes at circumferential intervals along the second guide ring, the cooling medium in the second outer chamber can be uniformly sprayed into the second inner chamber from multiple directions. On the one hand, this increases the contact area between the cooling medium and the stator 41, thereby further improving the cooling effect of the stator 41. On the other hand, it ensures that all parts of the radially inner side of the stator 41 receive effective cooling, which is beneficial for improving the cooling uniformity of the stator 41.

[0136] It should be noted that the embodiments of this application do not limit the number, size, or spacing of the second guide holes, and those skilled in the art can adjust them according to actual needs. It is understood that, provided the second guide ring has sufficient structural strength, increasing the number of second guide holes can improve the spray uniformity of the second guide ring to a certain extent. Therefore, in some embodiments, if multiple second guide holes located on the same circumference are defined as a row of second guide holes, those skilled in the art can increase the number of second guide holes by setting multiple rows of second guide holes, that is, by arranging multiple second guide holes at axial intervals along the second guide ring, or by arranging multiple second guide holes at radial intervals along the second guide ring, to improve the spray uniformity of the second guide ring, thereby further improving the cooling uniformity of the stator 41.

[0137] In some optional embodiments of this application, when the stator cooling structure is used, the pressure of the cooling medium in the second outer cavity is greater than the pressure of the cooling medium in the second inner cavity. That is, there is a pressure difference between the second outer cavity and the second inner cavity, which allows the cooling medium to be sprayed into the second inner cavity at a higher injection pressure. On the one hand, the higher injection pressure can make the sprayed cooling medium finer, thereby further increasing the contact area between the cooling medium and the stator winding 412. On the other hand, for the stator winding 412, which consists of multiple wires in the stator 41, the higher injection pressure can allow the cooling medium to enter the gaps between adjacent wires, thereby improving the sufficiency and uniformity of cooling of the stator winding 412.

[0138] It should be noted that the embodiments of this application do not limit the cooling medium pressure of the second outer chamber and the second inner chamber. Those skilled in the art can adjust it according to actual needs, such as the required injection pressure.

[0139] In this embodiment, the first cooling component 20 may include a first spray pipe 21 or a first guide ring 23, and the second cooling component 20 may include a second spray pipe 22 or a second guide ring. The cooling component 20 can have various combinations. For example, the cooling component may simultaneously include a first spray pipe 21 and a second spray pipe 22; or, the cooling component may simultaneously include a first spray pipe 21 and a second guide ring; or, the cooling component may simultaneously include a first guide ring 23 and a second spray pipe 22; or, the cooling component may simultaneously include a first guide ring 23 and a second guide ring. The cooling component can be flexibly configured according to usage requirements.

[0140] In the case where the first cooling assembly 20 includes the first liquid spray pipe 21, the inclusion of the first guide ring 23 in the first cooling assembly 20 can provide sufficient wiring space and assembly space for the stator winding 412 in the stator 41, which is convenient for mass production.

[0141] In some embodiments, the motor further includes a rotor 50 disposed within the housing 40. The rotor 50 and the stator 41 are spaced apart axially in the stator 41 to form an air gap. To prevent the cooling medium from leaking into the air gap and causing a decrease in motor performance, the stator cooling structure further includes a seal 10 disposed within the housing 40. The seal 10, the housing 40, and the stator 41 enclose a first cooling chamber 111 and a second cooling chamber 112.

[0142] In this embodiment, since a sealing element 10 is provided, and the sealing element 10, together with the housing 40 and the stator 41, forms a first cooling chamber 111 and a second cooling chamber 112, the sealing performance of the first cooling chamber 111 and the second cooling chamber 112 can be improved, effectively preventing the cooling medium from leaking into the air gap between the stator 41 and the rotor 50, which is beneficial to improving the working performance of the motor.

[0143] In some embodiments, the seal 10 includes a first sealing portion 12 and a second sealing portion 13 connected to each other. The first sealing portion 12, the housing 40 and the stator 41 enclose a first cooling chamber 111, and the first sealing portion 12, the second sealing portion 13, the housing 40 and the stator 41 enclose a second cooling chamber 112.

[0144] In some embodiments, the first sealing portion 12 is an annular structure extending radially along the stator 41, with its outer end connected to the housing 40 and its inner end connected to the second sealing portion 13. In this embodiment, the outer end of the first sealing portion 12 extends out of the stator 41 radially to enclose and form a first cooling chamber 111, and the inner end of the first sealing portion 12 also extends out of the stator 41 to enclose and form a second cooling chamber 112.

[0145] In some embodiments, the second sealing part 13 is a hollow cylindrical structure extending along the axial direction of the stator 41, and there is a gap between the second sealing part 13 and the radial inner side of the stator; along the axial direction of the stator 41, one end of the second sealing part 13 is connected to the inner end of the first sealing part 12, and the other end of the second sealing part 13 is connected to the housing 40.

[0146] In this embodiment, one end of the second sealing part 13 is connected to the inner end of the first sealing part 12, and the other end of the second sealing part 13 is connected to the housing 40. The first sealing part 12, the second sealing part 13, the housing 40 and the stator 41 enclose and form a second cooling chamber 112, which can prevent the cooling medium from leaking from the radial inner side of the stator 41 and prevent the leakage of the cooling medium from affecting the working performance of the motor.

[0147] In some embodiments, the stator 41 includes a stator core 411 and a stator winding 412 wound around the stator core 411. The stator winding 412 protrudes from the radially outer and radially inner sides of the stator core 411 to form a first end winding 46 and a second end winding 47. A first cooling chamber 111 is used to accommodate the first end winding 46 and to cool the first end winding 46. A second cooling chamber 112 is used to accommodate the second end winding 47 and to cool the second end winding 47.

[0148] In practical applications, the stator winding 412 includes a first end winding 46, a middle winding 48, and a second end winding 47 distributed sequentially from the outside to the inside along the radial direction of the stator 41. The middle winding 48 is connected to the stator core 411 to achieve the connection between the stator winding 412 and the stator core 411. The first end winding 46 protrudes radially outward from the stator 41, and the second end winding 47 protrudes radially inward from the stator 41. By providing the first cooling chamber 111 and the second cooling chamber 112, the inner and outer sides of the stator winding 412 can be cooled respectively, that is, the first end winding 46 and the second end winding 47, as well as the radially outer and radially inner sides of the stator 41, which helps to further improve the cooling effect of the stator 41.

[0149] In some embodiments, a mounting groove 413 extending radially along the stator core 411 is provided on the side of the stator core 411 near the first sealing part 12. The mounting groove 413 is used to mount the stator winding 412. The first sealing part 12 includes a sealing strip adapted to be sealed to the mounting groove 413.

[0150] Specifically, the middle winding 48 of the stator winding 412 is embedded in the mounting groove 413 so that the stator winding 412 is reliably connected to the stator core 411.

[0151] In this embodiment, there are gaps between the multiple wires in the mounting groove 413, or between the wires and the edge of the mounting groove 413. This causes the cooling medium in the first cooling chamber 111 and the second cooling chamber 112 to flow into each other. By using a sealing strip to seal the connection with the mounting groove 413, the influence of the flow of the cooling medium in the first cooling chamber 111 and the second cooling chamber 112 on the cooling effect can be avoided, and the flow of the cooling medium is more controllable.

[0152] In some embodiments, the seal 10 can be snapped onto one side of the stator 41, i.e., snapped onto the mounting groove 413. Alternatively, the seal 10 can also be detachably connected to one side of the stator 41 by bolts. No specific limitations are imposed in this embodiment, and those skilled in the art can configure it as needed.

[0153] In some embodiments, a plurality of mounting grooves 413 are provided, and the plurality of mounting grooves 413 are spaced apart circumferentially along the stator core 411; a plurality of sealing strips are provided, and the plurality of sealing strips are spaced apart circumferentially along the first sealing portion 12, and one sealing strip is embedded in one mounting groove 413.

[0154] It should be noted that the embodiments of this application do not limit the number of mounting slots 413 and sealing strips, and those skilled in the art can adjust them according to actual needs. It is understood that the number of mounting slots 413 and sealing strips should be consistent. By sealing one sealing strip with one mounting slot 413, the entire end face of the stator core 411 can be sealed, effectively preventing leakage of the cooling medium.

[0155] In some embodiments, the first sealing portion 12 and the second sealing portion 13 are integrally formed. This improves the overall structural strength of the seal 10, thus extending its service life. Furthermore, since no additional assembly steps are required between the first sealing portion 12 and the second sealing portion 13, the motor assembly process is simplified, reducing assembly requirements and improving assembly efficiency. It also simplifies the assembly of the seal 10 with the stator 41.

[0156] In some optional embodiments of this application, along the radial direction of the stator 41, the sealing element 10 includes, from the outside to the inside, a first sub-sealing part 121, a third sub-sealing part 123, and a second sub-sealing part 122, which are connected sequentially. The first sub-sealing part 121, the housing 40, and the stator 41 enclose a first cooling chamber 111; the second sub-sealing part 122, the second sealing part 123, the housing 40, and the stator 41 enclose a second cooling chamber 112; and the third sub-sealing part 123 is a sealing strip.

[0157] In some embodiments, in order to further improve the sealing effect between the seal 10 and the housing 40, the stator cooling structure further includes a first sealing ring, which is disposed between the seal 10 and the housing 40 to make the seal 10 and the housing 40 sealed together.

[0158] In this embodiment, two first sealing rings are provided. One first sealing ring is provided between the outer end of the first sealing part 12 and the housing 40, and the other first sealing ring is provided between the end of the second sealing part 13 away from the first sealing part 12 and the housing 40, thereby realizing the sealing connection between the sealing member 10 and the housing 40.

[0159] In some embodiments, the first cooling assembly 20 includes a first guide ring 23, which extends axially along the stator 41. One end of the first guide ring 23 is connected to the seal 10, and the other end is connected to the housing 40. The first guide ring 23 divides the first cooling chamber 111 into a first inner chamber 114 and a first outer chamber 113. The first inner chamber 114 and the first outer chamber 113 are distributed radially spaced along the stator 41. The first inner chamber 114 communicates with the cooling medium channel, and the first outer chamber 113 is used to cool the radially inner side of the stator 41. The first guide ring 23 is provided with a plurality of first guide holes 231, which communicate with the first inner chamber 114 and the first outer chamber 113.

[0160] In this embodiment, one end of the first guide ring 23 is connected to the seal 10, and the other end of the first guide ring 23 is connected to the housing 40, so as to divide the first cooling chamber 111 into a first inner chamber 114 and a first outer chamber 113.

[0161] In some embodiments, the first guide ring 23 and the seal 10 form an integrally molded structure. In the above structure of this application embodiment, on the one hand, the overall structural strength of the first guide ring 23 and the seal 10 can be improved, which is beneficial to increasing the service life of the first guide ring 23 and the seal 10. On the other hand, since no additional assembly steps are required between the first guide ring 23 and the seal 10, the motor assembly process can be simplified, the motor assembly requirements can be reduced, and the motor assembly efficiency can be improved. Furthermore, the assembly of the first guide ring 23 and the seal 10 with the stator 41 is also simplified.

[0162] In some embodiments, in order to further improve the sealing effect of the stator cooling structure, the stator cooling structure further includes a second sealing ring, which is disposed between the first guide ring 23 and the housing 40 so that the first guide ring 23 and the housing 40 are sealed together.

[0163] In some embodiments, the second cooling assembly 20 includes a second guide ring extending axially along the stator 41, one end of which is connected to the seal 10, and the other end of which is connected to the housing 40. The second guide ring divides the second cooling chamber 112 into a second inner chamber and a second outer chamber, which are radially spaced along the stator 41. The second inner chamber communicates with the cooling medium channel, and the second outer chamber is used to cool the radially inner side of the stator 41. The second guide ring is provided with a plurality of second guide holes, which communicate with the second inner chamber and the second outer chamber.

[0164] In this embodiment, one end of the second guide ring is connected to the seal 10, and the other end of the second guide ring is connected to the housing 40, so as to divide the second cooling chamber 112 into a second inner chamber and a second outer chamber.

[0165] In some embodiments, the second guide ring and the seal 10 form an integrally molded structure. In the above structure of this application embodiment, on the one hand, the overall structural strength of the second guide ring and the seal 10 can be improved, which is beneficial to increasing the service life of the second guide ring and the seal 10. On the other hand, since no additional assembly steps are required between the second guide ring and the seal 10, the motor assembly process can be simplified, the motor assembly requirements can be reduced, and the motor assembly efficiency can be improved. Furthermore, the assembly of the second guide ring and the seal 10 with the stator 41 is also simplified.

[0166] In some embodiments, in order to further improve the sealing effect of the stator cooling structure, the stator cooling structure further includes a second sealing ring, which is disposed between the second guide ring and the housing 40 so that the second guide ring and the housing 40 are sealed together.

[0167] In some embodiments, the housing 40 includes an end plate 401 and a side plate 402; wherein the end plate 401 is disposed on the side of the stator 41 away from the seal 10; the side plate 402 extends axially along the stator 41, and one end of the side plate 402 is connected to the outer peripheral end of the end plate 401; the radially outer sides of the end plate 401, the side plate 402, the seal 10 and the stator 41 enclose a first cooling chamber 111, and the radially inner sides of the end plate 401, the seal 10 and the stator 41 enclose a second cooling chamber 112.

[0168] It is understandable that the side plate 402 can be integrated with the end plate 401 to form an integral structure, or can be connected by welding or other methods.

[0169] In some embodiments, the cooling medium channel includes a cooling medium inlet channel 30 and a cooling medium outlet channel 31; the cooling medium inlet channel 30 is connected to the first cooling chamber 111 and the second cooling chamber 112 respectively; the cooling medium outlet channel 31 is connected to the first cooling chamber 111 and the second cooling chamber 112 respectively.

[0170] In the above structure of this application embodiment, the cooling medium enters the first cooling chamber 111 and the second cooling chamber 112 through the cooling medium inlet channel 30, and the cooling medium in the first cooling chamber 111 and the second cooling chamber 112 flows out of the stator cooling structure through the cooling medium outlet channel 31. In this way, the cooling medium can flow in the first cooling chamber 111 and the second cooling chamber 112 respectively to achieve circulating cooling and improve the cooling effect on the stator 41.

[0171] Furthermore, the cooling medium is located in the cooling medium inlet channel 30 to form an inlet fluid domain 61. The cooling medium in the cooling medium inlet channel 30 is sprayed into the first cooling chamber 111 through the first cooling component and into the second cooling chamber 112 through the second cooling component to form a spray fluid domain 62. The radially outer and radially inner sides of the stator 41 are in contact with the spray fluid domain 62. The inlet fluid domain 61 and the spray fluid domain 62 can be referenced. Figure 8 , Figure 13 and Figure 14 As shown.

[0172] In some embodiments, a cooling medium inlet channel 30 is disposed on an end plate 401 and / or a side plate 402; and / or, a cooling medium outlet channel 31 is disposed on an end plate 401 and / or a side plate 402.

[0173] In this embodiment, by setting the cooling medium inlet channel 30 on the end plate 401 and / or the side plate 402, and setting the cooling medium outlet channel 31 on the end plate 401 and / or the side plate 402, the cooling medium inlet channel 30 is directly integrated into the housing 40, which avoids the inconvenience of pipeline connection, and allows the cooling medium inlet channel 30 and the cooling medium outlet channel 31 to be as close as possible to the cooling chamber 11, which is beneficial to improving the cooling effect.

[0174] In this embodiment of the application, taking a cooling medium inlet channel 30 as an example, there are three ways to set it: the cooling medium inlet channel 30 is only set on the end plate 401, the cooling medium inlet channel 30 is only set on the side plate 402, and the cooling medium inlet channel 30 is set on both the end plate 401 and the side plate 402. Those skilled in the art can choose according to actual needs.

[0175] Furthermore, this application does not limit the number of cooling medium inlet channels 30 and cooling medium outlet channels 31 provided, and those skilled in the art can adjust them according to actual needs. In one embodiment, the motor includes two housings 40 that are axially opposite to each other and interconnected along the stator 41. For each housing 40, there may be only one cooling medium inlet channel 30 and one cooling medium outlet channel 31, or there may be multiple cooling medium inlet channels 30 and multiple cooling medium outlet channels 31. This is not limited here, and those skilled in the art can adjust it according to actual needs. Here, "multiple" refers to two or more values.

[0176] In some embodiments, a cooling medium inlet channel 30 is disposed on an end plate 401. The cooling medium inlet channel 30 includes: a liquid inlet 301, a first connecting port 302, and a second connecting port. The liquid inlet 301 is used to communicate with an external cooling device. The first connecting port 302 and the second connecting port are arranged radially apart along the stator 41. The first connecting port 302 communicates with the first cooling chamber 111, and the second connecting port communicates with the second cooling chamber 112.

[0177] In this embodiment, by connecting the liquid inlet 301 to an external circulating cooling device, the cooling medium can be circulated, thereby continuously cooling the stator 41 and improving the reliability of the motor. Furthermore, since a first connecting port 302 communicating with the first cooling chamber 111 and a second connecting port communicating with the second cooling chamber 112 are provided, the cooling medium from the cooling device can enter the cooling medium inlet channel 30 through the liquid inlet 301 and then be diverted to the first cooling chamber 111 and the second cooling chamber 112.

[0178] It should be noted that the specific structure of the cooling medium inlet channel 30 is not limited in the embodiments of this application, and those skilled in the art can make adjustments according to actual needs. Taking the cooling medium inlet channel 30 disposed on the end plate 401 as an example, the cooling medium inlet channel 30 can be a channel formed inside the end plate 401, or it can be formed on the surface of the end plate 401 with part of the outer wall of the cooling medium inlet channel 30 protruding from the surface of the end plate 401.

[0179] In some embodiments, the cooling medium inlet channel 30 includes a plurality of sub-inlet channels, each sub-inlet channel having a straight segment structure, and each sub-inlet channel intersecting and communicating with at least one other sub-inlet channel; one end of some sub-inlet channels is located at the outer peripheral end of the end plate 401 and is closed, and one end of the remaining sub-inlet channels is located at the outer peripheral end of the end plate 401 and forms a liquid inlet 301; at least one sub-inlet channel is provided with a first communication port, and at least one sub-inlet channel is provided with a second communication port.

[0180] In practical applications, a tool is usually used to punch a cooling medium inlet channel 30 on the end plate 401. The punched cooling medium inlet channel 30 is a straight segment structure. In order for the cooling medium inlet channel 30 to connect the first cooling chamber 111 and the second cooling chamber 112 at the same time, multiple holes need to be punched, that is, multiple sub-inlet channels are used to guide the cooling medium to the first cooling chamber 111 and the second cooling chamber 112.

[0181] It is understood that the cooling medium inlet channel 30 can also be formed during the manufacturing of the housing 40. In this case, the cooling medium inlet channel 30 can be a straight segment structure, an annular structure, etc., as long as the cooling medium is guided to the first cooling chamber 111 and the second cooling chamber 112. The embodiment of this application does not specifically limit the shape of the cooling medium inlet channel 30.

[0182] In one embodiment, the cooling medium inlet channel 30 may further include a first cooling medium inlet channel and a second cooling medium inlet channel; the first cooling medium inlet channel is provided with a first connecting port and a liquid inlet 301; the second cooling medium inlet channel is provided with a second connecting port and a liquid inlet 301.

[0183] In the above structure of the embodiments of this application, compared with a cooling medium inlet channel 30 that simultaneously connects the first cooling chamber 111 and the second cooling chamber 112, when dedicated cooling medium inlet channels 30 are provided for the first cooling chamber 111 and the second cooling chamber 112 respectively, not only can the structure of the cooling medium inlet channel 30 be simplified, but it is also convenient to regulate the flow rate of the cooling medium entering the first cooling chamber 111 and the second cooling chamber 112, which is beneficial to further improve the cooling effect of the stator 41.

[0184] In some embodiments, a first cooling medium inlet channel is provided on end plate 401, and / or a second cooling medium inlet channel is provided on end plate 401.

[0185] It is understood that there are three ways to set the first cooling medium inlet channel and the second cooling medium inlet channel 30: the first cooling medium inlet channel is set on the end plate 401; the second cooling medium inlet channel is set on the end plate 401; and the first cooling medium inlet channel and the second cooling medium inlet channel are set on the end plate 401 at the same time. Those skilled in the art can choose according to actual needs.

[0186] In some embodiments, the housing 40 is provided with a wiring cavity 42, which is located on the side of the side plate 402 away from the stator 41, and the end face of the end plate 401 at the opening of the wiring cavity 42 is provided with a liquid inlet 301.

[0187] In some embodiments, a cooling medium outlet channel 31 is disposed on an end plate 401. The cooling medium outlet channel 31 includes: a liquid outlet 312, a third connecting port, and a fourth connecting port. The liquid outlet 312 is used to communicate with an external cooling device. The third connecting port and the fourth connecting port are arranged radially apart along the stator 41. The third connecting port communicates with the first cooling chamber 111, and the fourth connecting port communicates with the second cooling chamber 112.

[0188] In the above structure of this application embodiment, by connecting the liquid outlet 312 to an external circulating cooling device, the cooling medium can be circulated, thereby continuously cooling the stator 41. Furthermore, since a third connecting port communicating with the first cooling chamber 111 and a fourth connecting port communicating with the second cooling chamber 112 are provided, the cooling medium that has completed heat exchange can flow into the cooling medium outlet channel 31 and then flow to the cooling device through the liquid outlet 312, thus realizing the circulation of the cooling medium.

[0189] In some embodiments, the cooling medium outlet channel 31 has a groove-shaped structure that extends radially along the stator 41. Along the radial direction of the stator 41, the stator 41 blocks the middle portion of the groove opening of the cooling medium outlet channel 31, and the two ends of the groove opening of the cooling medium outlet channel 31 are a third connecting port and a fourth connecting port, respectively. Of course, the specific structure of the cooling medium outlet channel 31 can also be configured according to usage requirements, for example, by referring to the structure of the cooling medium inlet channel 30.

[0190] During the flow of the liquid medium, the stator 41 can be cooled to improve the cooling efficiency of the stator 41.

[0191] In some embodiments, the cooling medium inlet channel 30 is a liquid inlet 301, and / or the cooling medium outlet channel 31 is a liquid outlet 312. The above structure of the embodiments of this application can further simplify the structure of the cooling medium inlet channel 30 and the cooling medium outlet channel 31, reducing the processing difficulty of the housing 40.

[0192] In one embodiment, two liquid inlets 301 are provided: one liquid inlet 301 is opened on the end plate 401 to communicate with the first cooling chamber 111, and the other liquid inlet is also opened on the end plate 401 to communicate with the second cooling chamber 112. Two liquid outlets 312 are provided: one liquid outlet 312 is opened on the end plate 401 and communicates with the first cooling chamber 111, and the other liquid outlet 312 is opened on the end plate 401 and communicates with the second cooling chamber 112.

[0193] The housing 40 and the stator 41 enclose a cooling chamber 11, with the stator 41 in direct contact with the cooling medium within the cooling chamber 11. Therefore, in the stator cooling structure of this embodiment, the stator 41 directly contacts the cooling medium for heat exchange, and the heat from the stator 41 is carried away to the outside of the motor through the circulation of the cooling medium, thereby achieving cooling of the stator 41. Compared to structures that indirectly cool the stator 41, this structure, where the stator 41 directly contacts the cooling medium for heat exchange, significantly improves the cooling effect on the stator 41.

[0194] Furthermore, a complete circulation path is established through the cooling component 20, allowing the cooling medium to be directly sprayed onto the stator 41, directly circulating the heat of the stator 41 to the outside of the motor. This effectively improves the motor's efficiency, torque density, and power density, as well as its continuous operating capability. Moreover, it further increases the motor's torque density and power density without increasing the motor's size.

[0195] This application discloses a stator 41, which includes the stator cooling structure described above. The stator cooling structure can significantly improve the cooling effect on the stator 41, thereby achieving effective cooling of the stator 41 and ensuring the working performance of the stator 41.

[0196] In some embodiments, the stator 41 includes a stator core 411 and a stator winding 412. The stator winding 412 is wound around the stator core 411. Along the radial direction of the stator core 411, a portion of the stator winding 412 protrudes radially outward from the stator core 411 to form a first end winding 46. A portion of the stator winding 412 protrudes radially inward from the stator core 411 to form a second end winding 47.

[0197] In this embodiment, the cooling chamber 11 cools the first end winding 46 and the second end winding 47 respectively. With the first end winding 46 protruding from the radial outer side of the stator core 411 and the second end winding 47 protruding from the radial inner side of the stator core 411, the contact area between the stator winding 412 and the cooling medium is large, which is beneficial to further improve the cooling effect of the stator 41.

[0198] In some embodiments, the housing 40 is provided with a wiring cavity 42, which is located on the side of the side plate 402 away from the stator winding 412. The stator 41 also includes a junction box, which is disposed in the wiring cavity 42. The junction box is used to connect the leads of the first end winding 46 and / or the second end winding 47.

[0199] In practical applications, corresponding through holes need to be provided on the seal 10 to allow the lead wire to pass through and connect to the junction box. To prevent the cooling medium from leaking from the gap between the lead wire and the through hole, sealing treatment is required between the lead wire and the through hole, such as by setting a sealing ring.

[0200] This application discloses an electric motor, which includes a stator 41 as described above.

[0201] In practical applications, the stator 41 of the motor in this embodiment exhibits superior cooling performance. When the cooling effect of the stator 41 is improved, the overall temperature of the motor decreases, which increases the permanent magnet flux linkage and output torque, thereby increasing the motor's torque density and efficiency. Furthermore, the current flowing through the stator 41 can be appropriately increased, thus increasing the electrical load and further enhancing the output torque and power, further improving the motor's torque density and power density. Moreover, compared to structures that indirectly cool the stator 41, the stator cooling structure in this embodiment employs direct cooling, meaning the stator 41 is in direct contact with the cooling medium. This improves cooling performance while saving space. Under the same torque and power requirements, the motor using the stator cooling structure of this embodiment can be designed to be smaller in size and weight, which is beneficial for motor and vehicle space arrangement and also contributes to vehicle lightweighting.

[0202] In some embodiments, the motor further includes a rotating shaft 43 and a rotor 50. Along the axial direction of the rotating shaft 43, a stator 41 and a rotor 50 are spaced apart, and the rotor 50 is fixedly connected to the rotating shaft 43. The stator 41 is rotatably connected to the rotating shaft 43 so that the rotor can rotate relative to the stator 41.

[0203] In this embodiment, during motor operation, the rotor 50 can be driven to rotate and output power through the electromagnetic interaction between the stator 41 and the rotor 50. By setting the rotor 50 and stator 41 at intervals, i.e., having a certain air gap between them, the electromagnetic interaction area can be precisely controlled, reducing leakage flux and reluctance loss, which is beneficial to improving the energy conversion efficiency and output power of the motor.

[0204] In some embodiments, the stator 41 includes two stators, one stator 41 disposed on one side of the rotor 50 and the other stator 41 disposed on the other side of the rotor 50 along the axial direction of the stator 41.

[0205] It should be noted that the accompanying drawings of this application embodiment only show the case where the motor has two stators 41 and a single rotor 50. In practical applications, the motor in this application embodiment can also be a single stator 41 and a single rotor 50, or a motor with N stators 41 and N-1 rotors 50. No limitation is made here, and those skilled in the art can adjust it according to actual needs. The motor can be used as a drive motor or a generator.

[0206] The housing 40 also includes a bearing chamber 403, which is disposed inside the end plate 401 and the seal 10. The bearing chamber 403 is used to mount the bearing 44. The bearing 44 is sleeved on the rotating shaft 43, and the outer ring of the bearing 44 is fixedly connected to the inner wall of the bearing chamber 403, while the inner ring of the bearing 44 is fixedly connected to the rotating shaft 43, so that the rotating shaft 43 can rotate relative to the housing 40. In addition, the motor also includes a position sensor (not shown in the figure), which is disposed inside the housing 40 and close to the rotating shaft 43, so as to transmit the position information of the motor to the motor controller in real time during motor operation.

[0207] The motor disclosed in this application can be an axial flux motor, which can be used in vehicles. This axial flux motor has advantages such as small size, light weight, and high efficiency.

[0208] This application discloses a powertrain, which includes the aforementioned motor. 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., and can also be hybrid, pure electric, range-extended, etc.

[0209] It should be noted that in this embodiment, the structure of the motor is the same as that of the motor in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0210] This application also discloses a vehicle, which includes the above-described motor, or the above-described powertrain.

[0211] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0212] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0213] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A stator cooling structure, characterized in that, include: A housing for accommodating a stator, the housing and the stator enclosing each other to form a cooling chamber, and the housing being provided with a cooling medium channel; And a cooling assembly, wherein the cooling medium channel is connected to the cooling chamber through the cooling assembly.

2. The stator cooling structure according to claim 1, characterized in that, The cooling chamber includes a first cooling chamber and a second cooling chamber along the radial direction of the stator. The first cooling chamber is located outside the second cooling chamber. The first cooling chamber is used to cool the radially outer side of the stator, and the second cooling chamber is used to cool the radially inner side of the stator.

3. The stator cooling structure according to claim 2, characterized in that, The cooling assembly includes a first cooling assembly and a second cooling assembly, which are arranged radially apart along the stator. The first cooling component is disposed within the first cooling chamber, and the first cooling component connects the cooling medium channel and the first cooling chamber; The second cooling component is disposed in the second cooling chamber, and the second cooling component connects the cooling medium channel and the second cooling chamber.

4. The stator cooling structure according to claim 3, characterized in that, The first cooling assembly includes a first spray pipe, which is arranged around the axis of the stator, and has a first spray port communicating with the first cooling chamber.

5. The stator cooling structure according to claim 4, characterized in that, The second cooling assembly includes a second liquid spray pipe, which is arranged around the axis of the stator, and has a second liquid spray port that communicates with the second cooling chamber.

6. The stator cooling structure according to claim 5, characterized in that, The first spray pipe is provided in at least two parts, and the at least two first spray pipes are arranged at intervals along the axial direction of the stator; and / or, The second spray pipe is provided in at least two, and the at least two second spray pipes are arranged at intervals along the axial direction of the stator.

7. The stator cooling structure according to claim 5, characterized in that, The first spray nozzle is provided in multiple locations, and the multiple first spray nozzles are arranged at intervals along the circumference of the first spray pipe; and / or, The second spray nozzle is provided in multiple ways, and the multiple second spray nozzles are arranged at intervals along the circumference of the second spray pipe.

8. The stator cooling structure according to claim 4, characterized in that, The second cooling assembly includes a second guide ring that divides the second cooling chamber into a second outer chamber and a second inner chamber. The second outer chamber is connected to the cooling medium channel, and the second inner chamber is used to cool the radially inner side of the stator. The second guide ring is provided with a second guide hole, which connects the second outer chamber and the second inner chamber.

9. The stator cooling structure according to claim 8, characterized in that, The second guide ring extends along the axial direction of the stator so that the second outer cavity and the second inner cavity are distributed radially spaced along the stator, or the second guide ring extends radially along the stator so that the second outer cavity and the second inner cavity are distributed radially spaced along the axial direction of the stator.

10. The stator cooling structure according to claim 8, characterized in that, The second guide hole is provided in a plurality of locations, which are spaced apart circumferentially along the second guide ring; and / or, the plurality of second guide holes are spaced apart axially along the second guide ring; and / or, the plurality of second guide holes are spaced apart radially along the second guide ring.

11. The stator cooling structure according to claim 3, characterized in that, The first cooling assembly includes a first guide ring that divides the first cooling chamber into a first outer chamber and a first inner chamber. The first outer chamber is connected to the cooling medium channel, and the first inner chamber is used to cool the radially inner side of the stator. The first guide ring is provided with a first guide hole, which connects the first outer chamber and the first inner chamber.

12. The stator cooling structure according to claim 11, characterized in that, The first guide ring extends along the axial direction of the stator so that the first outer cavity and the first inner cavity are distributed radially spaced along the stator; or, the first guide ring extends radially along the stator so that the first outer cavity and the first inner cavity are distributed radially spaced along the axial direction of the stator.

13. The stator cooling structure according to claim 11, characterized in that, The first guide hole is provided in multiple ways, and the multiple first guide holes are arranged circumferentially and spaced apart along the first guide ring; and / or, the multiple first guide holes are arranged axially and spaced apart along the first guide ring; and / or, the multiple first guide holes are arranged radially and spaced apart along the first guide ring.

14. The stator cooling structure according to claim 11, characterized in that, The second cooling assembly includes a second liquid spray pipe, which is arranged around the axis of the stator, and has a second liquid spray port that communicates with the second cooling chamber.

15. The stator cooling structure according to claim 14, characterized in that, The second spray pipe is provided in at least two, and the at least two second spray pipes are arranged at intervals along the axial direction of the stator.

16. The stator cooling structure according to claim 3, 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.

17. The stator cooling structure according to claim 16, characterized in that, The sealing element includes a first sealing part and a second sealing part connected to each other. The first sealing part, the housing and the stator enclose the first cooling chamber, and the first sealing part, the second sealing part, the housing and the stator enclose the second cooling chamber.

18. The stator cooling structure according to claim 17, characterized in that, The first sealing part is an annular structure extending radially along the stator. The outer end of the first sealing part is connected to the housing, and the inner end of the first sealing part is connected to the second sealing part.

19. The stator cooling structure according to claim 18, characterized in that, The stator includes a stator core and a stator winding wound around the stator core, wherein the stator winding at least partially protrudes from the radially outer and radially inner sides of the stator core to form a first end winding and a second end winding. The first cooling chamber is used to house the first end winding and to cool the first end winding; the second cooling chamber is used to house the second end winding and to cool the second end winding.

20. The stator cooling structure according to claim 19, characterized in that, The stator core is provided with a mounting groove extending radially along the side of the stator core near the first sealing part, and the mounting groove is used to install the stator winding. The first sealing part includes a sealing strip, which is adapted to be in a sealing connection with the mounting groove.

21. The stator cooling structure according to claim 20, 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; Multiple sealing strips are provided, and the multiple sealing strips are spaced apart along the circumference of the first sealing part, with one sealing strip embedded in one mounting groove.

22. The stator cooling structure according to claim 17, characterized in that, The second sealing part is a hollow cylindrical structure extending along the axial direction of the stator; Along the axial direction of the stator, one end of the second sealing part is connected to the inner end of the first sealing part, and the other end of the second sealing part is connected to the housing.

23. The stator cooling structure according to claim 17, characterized in that, The first sealing part and the second sealing part together form an integral molded structure.

24. The stator cooling structure according to claim 16, 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.

25. The stator cooling structure according to claim 16, characterized in that, The stator cooling structure also includes a second sealing ring; The first cooling assembly includes a first guide ring connected to the housing, the first guide ring dividing the first cooling chamber into a first inner chamber and a first outer chamber, and a second sealing ring disposed between the first guide ring and the housing to provide a sealed connection between the first guide ring and the housing; or... The second cooling assembly includes a second guide ring connected to the housing, the second guide ring dividing the second cooling chamber into a second inner chamber and a second outer chamber, and a second sealing ring disposed between the second guide ring and the housing to provide a sealed connection between the second guide ring and the housing.

26. The stator cooling structure according to claim 25, characterized in that, The first guide ring is connected to the sealing element, and the first guide ring and the sealing element together form an integrally molded structure; or... The second guide ring is connected to the seal, and the second guide ring and the seal together form an integral structure.

27. The stator cooling structure according to claim 16, characterized in that, The housing includes: An end plate, wherein the end plate is disposed on the side of the stator away from the seal; A side plate extends along the axial direction of the stator, and one end of the side plate is connected to the outer peripheral end of the end plate; The end plate, the side plate, the seal, and the outer radial side of the stator form the first cooling chamber, and the end plate, the seal, and the inner radial side of the stator form the second cooling chamber.

28. The stator cooling structure according to claim 27, characterized in that, The cooling medium channel includes a cooling medium inlet channel and a cooling medium outlet channel; The cooling medium inlet channel is connected to the first cooling chamber and the second cooling chamber respectively; The cooling medium outflow channel is connected to the first cooling chamber and the second cooling chamber, respectively.

29. The stator cooling structure according to claim 28, characterized in that, The cooling medium inlet channel is disposed in the end plate and / or the side plate; and / or The cooling medium outflow channel is provided on the end plate and / or the side plate.

30. The stator cooling structure according to claim 28, characterized in that, The cooling medium inlet channel is disposed on the end plate, and the cooling medium inlet channel includes: a liquid inlet, a first connecting port, and a second connecting port; The liquid inlet is used to connect with an external cooling device; The first communication port and the second communication port are arranged radially apart along the stator. The first communication port is connected to the first cooling chamber through the first cooling component, and the second communication port is connected to the second cooling chamber through the second cooling component.

31. The stator cooling structure according to claim 30, characterized in that, The cooling medium inlet channel includes multiple sub-inlet channels, each sub-inlet channel having a straight segment structure, and each sub-inlet channel intersects with and is connected to at least one other sub-inlet channel; One end of a portion of the sub-entry channel is located at the outer peripheral end of the end plate and is closed, while the remaining end of the sub-entry channel is located at the outer peripheral end of the end plate and forms the liquid inlet; At least one of the sub-entry channels is configured with the first connection port, and at least one of the sub-entry channels is configured with the second connection port.

32. The stator cooling structure according to any one of claims 28 to 31, characterized in that, The cooling medium outflow channel is disposed on the end plate, and the cooling medium outflow channel includes: a liquid outlet, a third connecting port and a fourth connecting port; The liquid outlet is used to connect with an external cooling device; The third and fourth communication ports are arranged radially apart along the stator. The third communication port communicates with the first cooling chamber, and the fourth communication port communicates with the second cooling chamber.

33. The stator cooling structure according to claim 32, characterized in that, The cooling medium outflow channel has a groove-shaped structure, and the groove-shaped structure extends radially along the stator; Along the radial direction of the stator, the stator blocks the middle part of the slot of the cooling medium outflow channel, and the two ends of the slot of the cooling medium outflow channel are the third connecting port and the fourth connecting port, respectively.

34. The stator cooling structure according to claim 28, characterized in that, The cooling medium inlet channel is a liquid inlet, and / or the cooling medium outlet channel is a liquid outlet.

35. A stator, characterized in that, Includes the stator cooling structure according to any one of claims 1-34.

36. The stator according to claim 35, characterized in that, include: Stator core; A stator winding is wound around the stator core. Along the radial direction of the stator core, a portion of the stator winding protrudes radially outward from the stator core to form a first end winding, and a portion of the stator winding protrudes radially inward from the stator core to form a second end winding.

37. The stator according to claim 36, characterized in that, The housing is provided with a wiring cavity, which is located on the side of the side plate away from the stator winding. The stator also includes a junction box, which is disposed inside the wiring cavity and is used to connect the lead wires of the first end winding and / or the second end winding.

38. An electric motor, characterized in that, The motor includes the stator according to any one of claims 35-37.

39. The motor according to claim 38, characterized in that, The motor also includes: Shaft; The rotor is arranged along the axial direction of the rotating shaft, and the stator and the rotor are spaced apart. The rotor is fixedly connected to the rotating shaft. The stator is rotatably connected to the shaft so that the rotor can rotate relative to the stator.

40. The motor according to claim 39, characterized in that, The stator comprises two, with one stator disposed on one side of the rotor and the other stator disposed on the other side of the rotor along the axial direction of the stator.

41. A powertrain, characterized in that, The motor included in any one of claims 38-40.

42. A vehicle, characterized in that, It includes the motor according to any one of claims 38-40, or the powertrain according to claim 41.

Images