Power motor, electric engine, electric propulsion device and aircraft

Abstract

The present application provides a power motor, an electric engine, an electric propulsion device and an aircraft, relating to the technical field of aircraft. The stator core assembly and the stator winding assembly of the power motor are arranged in the liquid cooling cavity of the bracket assembly. The cavity wall of the liquid cooling cavity has a liquid outlet and at least two liquid supply ports. In the axial direction of the stator core assembly, the at least two liquid supply ports are arranged at intervals. The liquid supply ports are used for supplying a cooling medium to flow into the liquid cooling cavity, and the liquid outlet is used for the cooling medium in the liquid cooling cavity to flow out. In this way, the cooling medium output by the liquid inlet flow channel can be output along the axial direction of the stator winding assembly through at least two liquid supply ports and enter the liquid cooling cavity, which can make the temperature in the axial direction of the stator winding assembly in the liquid cooling cavity more uniform, realize uniform heat dissipation of the coil winding and the stator winding assembly in the axial direction of the stator core assembly, so as to improve the working performance of the power motor.

Description

Technical Field

[0001] The present application relates to the technical field of aircraft, and in particular, to a power motor, an electric engine, an electric propulsion device, and an aircraft. Background Art

[0002] An electric vertical take-off and landing aircraft (eVTOL) includes an electric propulsion device. The electric propulsion device includes a propeller and an electric propulsion system. The electric propulsion system includes a power motor. The power motor is in transmission connection with the propeller and is used to drive the propeller to rotate. Among them, the power motor is a moving device with high-power heat generation. During the operation of the power motor, the generated heat continuously accumulates with the increase of working time, so that the temperature inside the power motor gradually rises, thereby reducing the working performance of the power motor.

[0003] Currently, in the related art, for a moving device with high-power heat generation, such as the drive motor of a new energy vehicle, usually the drive motor is provided with a cooling channel. The cooling medium passing through the cooling channel indirectly exchanges heat with the stator housing and the stator winding of the stator respectively, so that the temperature of the drive motor is within a reasonable range.

[0004] However, in order to meet the requirements of weight and layout space, an electric vertical take-off and landing aircraft usually requires the designed components to be small and precise and ensure the achievement of performance. If the cooling channel in the related art is used to dissipate heat from the power motor, it will cause the electric engine to be relatively large in volume and cannot meet the heat dissipation requirements of the power motor.

[0005] In the related art, a power motor usually includes a stator core assembly and a stator winding assembly wound around the stator core assembly. The stator winding assembly is the heat source of the power motor. In the related art, the heat dissipation of the stator winding assembly is uneven in the axial direction of the stator core assembly.

[0006] Therefore, how to make the heat dissipation of the stator winding assembly relatively uniform in the axial direction of the stator core assembly while realizing the miniaturization of the power motor has become an urgent problem to be solved in the field of aircraft design. Summary of the Invention

[0007] The embodiments of the present application provide a power motor, an electric engine, an electric propulsion device, and an aircraft, which can improve the uniformity of heat dissipation of the cooling medium to the stator winding assembly in the power motor, so as to improve the working performance of the power motor, and facilitate the miniaturization of the power motor while the heat dissipation of the stator winding assembly is relatively uniform in the axial direction of the stator core assembly.

[0008] The first aspect of the embodiments of the present application provides a power motor. The power motor includes a stator;

[0009] The stator includes a bracket assembly, a stator core assembly, and a stator winding assembly wound around the stator core assembly. The bracket assembly has a liquid cooling cavity, and the stator core assembly and the stator winding assembly are arranged in the liquid cooling cavity;

[0010] The cavity wall of the liquid cooling cavity has a liquid outlet and at least two liquid inlets;

[0011] In the axial direction of the stator core assembly, at least two liquid inlets are arranged at intervals;

[0012] The liquid inlets are used for the cooling medium to flow into the liquid cooling cavity, and the liquid outlet is used for the cooling medium in the liquid cooling cavity to flow out;

[0013] The cooling medium in the liquid cooling cavity is in direct contact with the stator core assembly and the stator winding assembly.

[0014] In the electric motor provided by the embodiment of the present application, by arranging at least two liquid inlets at intervals in the axial direction of the stator core assembly, the cooling medium output from the liquid inlet channel can enter the liquid cooling cavity along the axial direction of the stator winding assembly through at least two liquid inlets, which can make the temperature in the axial direction of the liquid cooling cavity more uniform, so as to ensure that the temperature of the stator winding assembly in the axial direction of the stator core assembly is more uniform, thereby realizing uniform heat dissipation of the coil winding and the stator winding assembly in the axial direction of the stator core assembly, so as to improve the working performance of the power motor.

[0015] In some possible implementation manners, at least two liquid inlets include a first liquid inlet;

[0016] The stator core assembly includes a first end and a second end, and the first end and the second end are respectively located at both ends of the axial direction of the stator core assembly;

[0017] In the axial direction of the stator core assembly, the first liquid inlet is located between the first end and the second end.

[0018] In some possible implementation manners, a communication channel is provided in the liquid cooling cavity, the first liquid inlet is communicated with the communication channel, and the part of the liquid cooling cavity communicated with the liquid outlet is communicated with the communication channel;

[0019] In the axial direction of the stator core assembly, there is a first interval space between the first end and the cavity wall of the liquid cooling cavity;

[0020] The liquid outlet is communicated with the first interval space, and the first interval space is communicated with the communication channel.

[0021] In some possible implementation manners, the stator core assembly includes a first surface;

[0022] The first surface has a first groove, and the first groove and the cavity wall of the liquid cooling cavity provided with the first liquid inlet enclose to form a communication channel. The first groove penetrates through the first end, so that the cavity of the first groove is communicated with the first interval space.

[0023] In some possible implementations, the liquid cooling cavity has a second groove on the cavity wall provided with the first liquid supply port. The second groove and the stator core assembly enclose a communication flow channel, and the first liquid supply port is located on the groove wall of the second groove.

[0024] Axially of the stator core assembly, the first end is located between the two ends of the second groove, so that the groove cavity of the second groove communicates with the first spaced space.

[0025] In some possible implementations, the stator core assembly has a communication hole, and the communication hole forms a communication flow channel;

[0026] The stator core assembly includes a core fixing ring;

[0027] The core fixing ring includes a first surface and a second surface. The first surface and the second surface are respectively located on both sides of the core fixing ring in the radial direction. The communication hole penetrates through the first surface and the second surface. One end of the communication hole located on the first surface communicates with the first liquid supply port. There is a second spaced space between the second surface and the cavity wall of the liquid cooling cavity. One end of the communication hole located on the second surface communicates with the second spaced space, and the second spaced space communicates with the liquid outlet.

[0028] In some possible implementations, the at least two liquid supply ports include a second liquid supply port;

[0029] Axially of the stator core assembly, the second liquid supply port is located on one side of the second end of the stator core assembly away from the first end of the stator core assembly.

[0030] In some possible implementations, the at least two liquid supply ports include a second liquid supply port;

[0031] A spray structure is provided on the cavity wall of the liquid cooling cavity;

[0032] Axially of the stator core assembly, the spray structure is close to the second end of the stator core assembly;

[0033] The second liquid supply port communicates with the spray structure. The spray port of the spray structure communicates with the liquid cooling cavity. The spray port of the spray structure is used for spraying towards the direction of the stator core assembly.

[0034] In some possible implementations, the at least two liquid supply ports include a first liquid supply port and a second liquid supply port;

[0035] Axially of the stator core assembly, the first liquid supply port and the second liquid supply port are arranged at intervals, and the liquid outlet is located on the side of the first liquid supply port away from the second liquid supply port;

[0036] The flow area of the first liquid supply port is smaller than the flow area of the second liquid supply port.

[0037] In some possible implementations, the bracket assembly has a liquid inlet channel and at least two liquid supply channels;

[0038] Axially of the stator core assembly, the at least two liquid supply channels are sequentially distributed. The channel wall of the liquid supply channel has a liquid supply port. The liquid supply channel communicates with the liquid cooling cavity through the liquid supply port, and the inlet of the liquid supply channel communicates with the outlet of the liquid inlet channel.

[0039] In some possible implementations, the at least two liquid supply channels include a first liquid supply channel and a second liquid supply channel;

[0040] Axially of the stator core assembly, the outlet of the liquid inlet channel is located between the inlet of the first liquid supply channel and the inlet of the second liquid supply channel;

[0041] The bracket assembly further has a first diversion channel and a second diversion channel;

[0042] The outlet of the liquid inlet channel communicates with the inlet of the first liquid supply channel through the first diversion channel, and the outlet of the liquid inlet channel communicates with the inlet of the second liquid supply channel through the second diversion channel;

[0043] The flow area of the first diversion channel is smaller than the flow area of the second diversion channel.

[0044] In some possible implementations, the bracket assembly further has a bypass channel;

[0045] At least one liquid supply channel includes at least two liquid supply segments distributed circumferentially of the stator core assembly. The channel wall of the liquid supply segment has a liquid supply port. The liquid supply segment communicates with the liquid cooling cavity through the liquid supply port;

[0046] In the same liquid supply channel, the inlet of one of the at least two liquid supply segments communicates with the outlet of the liquid inlet channel, and the inlets of the remaining liquid supply segments of the at least two liquid supply segments communicate with the bypass channel. The inlet of the bypass channel communicates with the liquid inlet channel.

[0047] In some possible implementations, the bracket assembly includes a stator bracket, a first cover, a second cover, and a sleeve;

[0048] The stator core assembly is sleeved on the outer side of the stator bracket radially, and the sleeve is sleeved on the outer side of the stator core assembly radially;

[0049] The first cover is connected to one end of the sleeve and the stator bracket, and the first cover is sealingly connected to the sleeve and the stator bracket;

[0050] The second cover is connected to the other end of the sleeve and the stator bracket, and the second cover is sealingly connected to the sleeve and the stator bracket;

[0051] The stator bracket, sleeve, first retaining cover, and second retaining cover are used to enclose and form a liquid cooling cavity. The liquid supply port is provided on the stator bracket, and the liquid discharge port is provided on the first retaining cover or the second retaining cover.

[0052] In a second aspect of the embodiments of the present application, an electric engine is provided. The electric engine includes a radiator and a power motor as described in any one of the above;

[0053] The liquid discharge port of the power motor is communicated with the inlet of the radiator, and the liquid supply port of the power motor is communicated with the outlet of the radiator.

[0054] In a third aspect of the embodiments of the present application, an electric propulsion device is provided. The electric propulsion device includes a propeller and an electric engine as described above;

[0055] The electric engine is in transmission connection with the propeller.

[0056] In a fourth aspect of the embodiments of the present application, an aircraft is provided. The aircraft includes a fuselage, wings, a tail, and an electric propulsion device as described above;

[0057] The electric propulsion device is arranged on the wings, and / or the fuselage, and / or the tail. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0059] Figure 1 It is a schematic structural diagram of an aircraft provided by an embodiment of the present application;

[0060] Figure 2 It is a schematic structural diagram of an electric engine provided by an embodiment of the present application;

[0061] Figure 3 It is a schematic structural diagram of a power motor in a first perspective provided by an embodiment of the present application;

[0062] Figure 4 It is an exploded view of a power motor provided by an embodiment of the present application;

[0063] Figure 5 It is a partial schematic diagram of a stator winding assembly provided by an embodiment of the present application;

[0064] Figure 6 It is an internal schematic diagram of a power motor provided by an embodiment of the present application;

[0065] Figure 7 ForFigure 6 Partial schematic diagram of the medium power motor;

[0066] Figure 8 Partial internal schematic of a power motor provided by an embodiment of the present application Figure 1 ;

[0067] Figure 9 Partial internal schematic of a power motor provided by an embodiment of the present application Figure 2 ;

[0068] Figure 10 Structural diagram of the power motor provided by an embodiment of the present application from the second perspective;

[0069] Figure 11 is Figure 10 Partial schematic of the medium power motor Figure 1 ;

[0070] Figure 12 is Figure 11 Schematic diagram of the structure of the medium power motor with the stator winding assembly removed;

[0071] Figure 13 Internal schematic of a stator bracket provided by an embodiment of the present application;

[0072] Figure 14 Partial internal schematic of a stator bracket provided by an embodiment of the present application;

[0073] Figure 15 Partial schematic of a bracket assembly provided by an embodiment of the present application;

[0074] Figure 16 Partial schematic of a power motor provided by an embodiment of the present application Figure 2 ;

[0075] Figure 17 Structural diagram of a stator bracket provided by an embodiment of the present application;

[0076] Figure 18 Partial structural schematic of a stator bracket provided by an embodiment of the present application Figure 1 ;

[0077] Figure 19 Partial structural schematic of a stator bracket provided by an embodiment of the present application Figure 2 ;

[0078] Figure 20 Partial schematic of a stator bracket on the side of the liquid inlet flow channel provided by an embodiment of the present application;

[0079] Figure 21Schematic diagram of the structure of a stator bracket at the outlet position of the bypass flow channel provided by an embodiment of the present application;

[0080] Figure 22 Schematic diagram of the structure of a stator in the connected flow channel provided by an embodiment of the present application;

[0081] Figure 23 Another schematic diagram of the structure of a stator in the connected flow channel provided by an embodiment of the present application;

[0082] Figure 24 Schematic diagram of the structure of a spray structure in a power motor provided by an embodiment of the present application;

[0083] Figure 25 Schematic diagram of the structure of a liquid pump from a first perspective provided by an embodiment of the present application;

[0084] Figure 26 Schematic diagram of the structure of a liquid pump from a second perspective provided by an embodiment of the present application.

[0085] Reference numerals:

[0086] 11, fuselage; 12, wing; 13, tail; 14, arm; 15, nacelle;

[0087] 20, electric propulsion device; 20a, fixed electric propulsion device; 20b, tilting electric propulsion device; 21, electric motor; 22, propeller;

[0088] 30, power motor;

[0089] 31, bracket assembly; 310a, liquid cooling cavity; 310b, first spaced-apart space; 310c, second spaced-apart space; 311, stator bracket; 3111, second groove; 312, first cover; 313, second cover; 314, sleeve; 315, liquid outlet;

[0090] 32, stator core assembly; 32a, first end; 32b, second end; 32c, first groove; 321, stator core; 3211, protrusion; 322, core fixing ring; 3221, groove;

[0091] 33, stator winding assembly; 331, coil winding; 332, insulating paper;

[0092] 34, liquid supply flow channel; 34a, first liquid supply flow channel; 34b, second liquid supply flow channel; 341, liquid supply section; 341a, first liquid supply section; 341b, second liquid supply section; 3411, first sub-section; 3412, second sub-section; 342, liquid supply port; 3421, first liquid supply port; 3422, second liquid supply port;

[0093] 35. Liquid inlet channel; 351. First port; 352. Second port;

[0094] 36. Bypass channel;

[0095] 37. Diversion channel; 371. First diversion channel; 3711. Third sub - diversion channel; 3712. Fourth sub - diversion channel; 3713. Third sub - diversion section; 3714. Fourth sub - diversion section; 372. Second diversion channel; 3721. First sub - diversion channel; 3722. Second sub - diversion channel; 3723. First sub - diversion section; 3724. Second sub - diversion section; 373. Liquid separation channel;

[0096] 38. Connecting channel;

[0097] 39. Spraying structure;

[0098] 40. Radiator;

[0099] 50. Fan;

[0100] 60. Liquid pump; 61. Medium inlet; 62. Medium outlet. Detailed implementation manners

[0101] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0102] It should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0103] In the present application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the connection inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0104] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0105] In the above description, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0106] Figure 1 A schematic diagram of the structure of an aircraft is shown. Refer to Figure 1 As shown, an embodiment of this application provides an aircraft. For example, the aircraft can be Figure 1 the electric vertical take-off and landing (eVTOL) aircraft shown in Figure 1 However, it should be noted that

[0107] Below in conjunction with Figure 1 the structure of the aircraft will be described.

[0108] Refer to Figure 1 As shown, the aircraft includes a fuselage 11 and wings 12. Among them, the fuselage 11 is a symmetric structure, and the remaining structure and shape of the fuselage 11 are not limited, and the fuselage structure of existing aircraft can be referred to. The wings 12 are fixedly connected to the fuselage 11 and extend along both sides of the fuselage 11. The wings 12 on both sides are symmetrically arranged with respect to the symmetry plane of the fuselage 11. The structure of the wings 12 can also refer to the fixed wing structure of existing aircraft, which will not be elaborated here.

[0109] It should be noted that in some embodiments, in addition to the fuselage 11 and the wing 12, the aircraft may further include a tail fin 13. The tail fin 13 is fixedly arranged at the tail of the fuselage 11, and the tail fin 13 is integrally formed or mechanically connected with the fuselage 11 and is symmetric with respect to the symmetry plane of the fuselage 11. The structure of the tail fin 13 may also refer to the tail fin structure of existing aircraft, which will not be elaborated here.

[0110] Referring to Figure 1 As shown, the aircraft further includes an electric propulsion device 20. The electric propulsion device 20 is a device that provides power for the aircraft. The number of electric propulsion devices 20 is one or more. For example Figure 1 As shown, the aircraft includes eight electric propulsion devices 20. The electric propulsion devices 20 are arranged on the wing 12, and / or the fuselage 11, and / or the tail fin 13, that is to say, the electric propulsion devices 20 can be arranged on at least one of the wing 12, the fuselage 11 and the tail fin 13.

[0111] For example, as Figure 1 shown, electric propulsion devices 20 are symmetrically arranged on both the wing 12 and the tail fin 13. Of course, in some scenarios, the electric propulsion devices 20 are arranged on the fuselage 11, and there are no electric propulsion devices 20 on the wing 12 and the tail fin 13. In some other scenarios, the electric propulsion devices 20 are arranged on the wing 12, and there are no electric propulsion devices 20 on the fuselage 11 and the tail fin 13. Or, in some other embodiments, the electric propulsion devices 20 are arranged on the tail fin 13, and there are no electric propulsion devices 20 on the fuselage 11 and the wing 12.

[0112] Continuing to refer to Figure 1 As shown, the aircraft further includes an arm 14 and a nacelle 15. Both the arm 14 and the nacelle 15 are used to be connected to the electric propulsion device 20 to arrange the electric propulsion device 20 on the fuselage 11, the wing 12 or the tail fin 13. Of course, in some scenarios, the aircraft may also include one of the arm 14 and the nacelle 15.

[0113] In some embodiments, as Figure 1 shown, the electric propulsion device 20 is arranged on the wing 12 through the arm 14. In some other embodiments, the electric propulsion device 20 can also be arranged on the wing 12 through the nacelle 15 (not shown in the figure).

[0114] In some embodiments, as Figure 1 shown, the electric propulsion device 20 is arranged on the tail fin 13 through the nacelle 15. In some other embodiments, the electric propulsion device 20 can also be arranged on the tail fin 13 through the arm 14 (not shown in the figure).

[0115] In some examples, the electric propulsion device 20 arranged on the aircraft may include a fixed electric propulsion device 20a, and the fixed electric propulsion device 20a is fixedly connected to any one of the fuselage 11, the wing 12 and the tail fin 13.

[0116] In some examples, the electric propulsion device 20 provided on the aircraft may include a tilting electric propulsion device 20b. A tilting mechanism is provided between the tilting electric propulsion device 20b and any one of the fuselage 11, the wing 12, and the tail 13. The tilting mechanism is used to adjust the tilting angle of the tilting electric propulsion device 20b.

[0117] In some examples, all the electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20a.

[0118] In other examples, all the electric propulsion devices 20 provided on the aircraft are tilting electric propulsion devices 20b.

[0119] In still other examples, some of the electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20a and some are tilting electric propulsion devices 20b. For example Figure 1 as shown, where four electric propulsion devices 20 are fixed electric propulsion devices 20a and the remaining four electric propulsion devices 20 are tilting electric propulsion devices 20b. The fixed electric propulsion devices 20a are arranged outside the tilting electric propulsion devices 20b.

[0120] In the embodiments of the present application, the electric propulsion device 20 includes a power battery (not shown in the figure), an electric motor 21, and a propeller 22. Among them, the electric motor 21 includes a power motor 30, a motor controller (not shown in the figure), cables, etc., and can convert electrical energy into mechanical energy. In actual implementation, the electric motor 21 can also be referred to as an electric propulsion system.

[0121] As Figure 1 shown, the electric motor 21 is arranged on the arm 14 or the nacelle 15. The propeller 22 is arranged on one side of the electric motor 21. The electric motor 21 is in transmission connection with the propeller 22. The electric motor 21 is used to drive the propeller 22 to rotate to provide power for the aircraft.

[0122] The embodiments of the present application also provide an electric propulsion device 20. The electric propulsion device 20 includes a propeller 22 and an electric motor 21.

[0123] Figure 2 Schematically shows a structural diagram of an electric motor 21.

[0124] See Figure 2 shown, the electric motor 21 includes a power motor 30. The power motor 30 can be arranged on the fuselage 11 and / or the wing 12 and / or the tail 13 through a mounting seat.

[0125] The propeller 22 is arranged on one side of the power motor 30. The power motor 30 is in transmission connection with the propeller 22. The power motor 30 is used to drive the propeller 22 to rotate.

[0126] Figure 3 Schematically shows a structural schematic diagram of a power motor 30 from a first perspective, Figure 4 Schematically shows an exploded view of a power motor 30.

[0127] See Figure 3 and Figure 4 As shown, the power motor 30 includes a stator. The stator includes a bracket assembly 31. The bracket assembly 31 can also be referred to as the housing of the power motor 30.

[0128] The stator further includes an iron core winding assembly. The iron core winding assembly is disposed within the bracket assembly 31. The iron core winding assembly includes a stator iron core assembly 32 and a stator winding assembly 33 wound around the stator iron core assembly 32. The stator iron core assembly 32 includes a plurality of stator iron cores 321, and the plurality of stator iron cores 321 are spaced apart along the circumferential direction W of the bracket assembly 31 within the bracket assembly 31. The stator winding assembly 33 includes a plurality of coil windings 331. Insulating paint can be externally coated on the coil windings 331. When the stator winding assembly 33 is wound around the stator iron core assembly 32, each stator iron core 321 is wound with a coil winding 331.

[0129] The power motor 30 further includes a rotor (not shown in the figure). The rotor is rotatably connected to the bracket assembly 31, and the iron core winding assembly is used to drive the rotor to rotate. Specifically, when the coil windings 331 are energized, the magnetic field generated by the stator iron cores 321 can drive the rotor to rotate. The rotor is in transmission connection with the propeller 22, so that when the rotor rotates, it can drive the propeller 22 to rotate to provide power for the aircraft.

[0130] In the process of developing power motors 30 with high torque density, high power density, etc., the cooling problem has always been an important factor restricting the research and development of power motors 30. The cooling of the power motor 30 directly affects the working performance and service life of the power motor 30. Therefore, improving the heat dissipation performance during the operation of the power motor 30 is of great significance for the research of high-performance power motors 30.

[0131] Currently, during the operation of the power motor in the aircraft, the heat generated continuously accumulates with the increase of working time, causing the temperature inside the power motor to gradually rise, thereby reducing the working performance of the power motor. Therefore, in the field of electric vertical takeoff and landing aircraft, in order to improve the working performance of the power motor, it is necessary to improve the heat dissipation performance during the operation of the power motor, and power motor cooling has always been an important research direction in the field of power motors.

[0132] In the related art, a power motor is usually provided with a liquid supply port, and the liquid supply port can provide a cooling medium for the stator winding assembly in the power motor to dissipate heat from the stator winding assembly through the cooling medium. However, the liquid supply of the existing power motor is uneven, which easily leads to uneven heat dissipation of the stator winding assembly. The stator winding assembly is the heat source of the power motor. When the stator winding assembly has uneven heat dissipation, it will affect the improvement of the working performance of the power motor.

[0133] An embodiment of the present application provides a power motor 30. The iron core winding assembly is arranged in the liquid cooling cavity 310a of the bracket assembly 31, and the bracket assembly 31 at least has a liquid supply flow channel 34 and a liquid inlet flow channel 35. The liquid supply flow channel 34 conducts the liquid supply flow channel 34 and the liquid cooling cavity 310a, so that the cooling medium in the liquid supply flow channel 34 can enter the liquid cooling cavity 310a through the liquid supply flow channel 34 to dissipate heat from the coil winding 331. At the same time, it can make the cooling of each part of the stator winding assembly 33 in the iron core winding assembly more uniform in the circumferential direction, improving the working performance of the power motor 30.

[0134] It should be noted that the cooling medium can be a liquid medium such as cooling oil or cooling water.

[0135] In the following, taking the cooling medium as cooling oil as an example, and in combination with the drawings and embodiments, the structure of the power motor 30 provided by the embodiment of the present application will be further elaborated.

[0136] See Figure 3 and Figure 4 As shown, as described above, the power motor 30 includes a bracket assembly 31 and an iron core winding assembly. Figure 4 shows the structures of the stator iron core assembly 32 and the stator winding assembly 33 in the iron core winding assembly. The setting of the stator winding assembly 33 on the stator iron core assembly 32 can be referred to the relevant description above, and will not be further elaborated here.

[0137] Figure 5 shows a partial schematic diagram of a stator winding assembly 33.

[0138] See Figure 5 As shown, in addition to the coil winding 331, the stator winding assembly 33 further includes an insulating paper 332, and an insulating paper 332 is provided on one side of the same coil winding 331 facing the wound stator iron core 321.

[0139] Figure 6 schematically shows an internal schematic diagram of a power motor 30, Figure 7 is Figure 6 a partial schematic diagram of the power motor 30 in

[0140] See Figure 6 and Figure 7As shown, the iron core winding assembly is arranged inside the support assembly 31. Specifically, as Figure 7 shown in Figure 7 , the support assembly 31 has a liquid cooling cavity 310a, and the stator iron core assembly 32 and the stator winding assembly 33 are arranged inside the liquid cooling cavity 310a to realize the installation of the iron core winding assembly inside the support assembly 31. For example, the liquid cooling cavity 310a can be an annular cavity, so that each part of the stator iron core assembly 32 in the circumferential direction W can be arranged inside the liquid cooling cavity 310a.

[0141] Since the stator winding assembly 33 is arranged inside the liquid cooling cavity 310a, when the cooling medium flows into the liquid cooling cavity 310a, it can take away the heat of the coil winding 331 in the stator winding assembly 33 to realize the heat dissipation of the coil winding 331.

[0142] Since the coil winding 331 is the heat source of the iron core winding assembly, when the cooling medium flows into the liquid cooling cavity 310a and takes away the heat of the coil winding 331, it can realize the heat dissipation of the iron core winding assembly.

[0143] Figure 8 shows a partial internal schematic of a power motor 30 Figure 1 , Figure 9 shows a partial internal schematic of a power motor 30 Figure 2 .

[0144] Refer to Figure 8 and Figure 9 shown, the support assembly 31 includes a stator support 311, a first cover 312, a second cover 313 and a sleeve 314. For example, the material of the sleeve 314 can be carbon fiber. The iron core winding assembly is sleeved outside the stator support 311 in the radial direction X, and the sleeve 314 is sleeved outside the iron core winding assembly in the radial direction X. The first cover 312 is connected to one end of the sleeve 314 and the stator support 311, and the first cover 312 is hermetically connected to the sleeve 314 and the stator support 311. The second cover 313 is connected to the other end of the sleeve 314 and the stator support 311, and the second cover 313 is hermetically connected to the sleeve 314 and the stator support 311.

[0145] The stator support 311, the sleeve 314, the first cover 312 and the second cover 313 are used to enclose and form the liquid cooling cavity 310a to realize the installation of the iron core winding assembly inside the support assembly 31, and at the same time, the tightness of the liquid cooling cavity 310a can be ensured.

[0146] Figure 10 This is the structure diagram of the power motor 30 provided by the embodiment of the present application from the second perspective, Figure 11 showing Figure 10 the partial schematic of the power motor 30 in Figure 10 Figure 1The assembly effect of the stator core assembly 32 and the stator winding assembly 33 within the bracket assembly 31 can be referred to Figure 10 and Figure 11 as shown.

[0147] Due to the provision of the first cover 312 and the second cover 313, when disassembling and assembling the core winding assembly, only the first cover 312 or the second cover 313 needs to be opened to achieve the disassembly and assembly of the core winding assembly within the bracket assembly 31, thereby simplifying the disassembly and assembly of the core winding assembly within the bracket assembly 31.

[0148] In some embodiments, the first cover 312 can be hermetically connected to the sleeve 314 and the stator bracket 311 by means such as using a sealing ring, sealant, or a combination of sealant and fasteners. For example, the fastener can be a rivet, etc. The sealant can be a high-temperature and high-strength epoxy structural adhesive. Similarly, the second cover 313 can also be hermetically connected to the sleeve 314 and the stator bracket 311 by means such as using a sealing ring, sealant, or a combination of sealant and fasteners.

[0149] Figure 12 shows Figure 11 the structural schematic diagram of the power motor 30 in

[0150] Refer to Figure 12 As shown, in some embodiments, in addition to the stator core 321, the stator core 321 group further includes a core fixing ring 322. A plurality of stator cores 321 can be arranged in an array along the circumferential direction W (360°) of the core fixing ring 322. The stator core 321 can be fixed within the stator bracket 311 through the core fixing ring 322 to enhance the fixing effect of the core winding assembly within the liquid cooling cavity 310a.

[0151] For example, a groove 3221 can be provided on one of the stator core 321 and the core fixing ring 322, and a protrusion 3211 with a structure matching (the same or similar) to the groove 3221 can be provided on the other. The protrusion 3211 can be embedded into the groove 3221 to achieve the snap connection between the stator core 321 and the core fixing ring 322. Figure 12 In

[0152] Taking this structure as an example, a plurality of grooves 3221 can be provided on the circumferential direction W of the core fixing ring 322 so that each stator core 321 can be snap-connected to the core fixing ring 322.

[0153] Refer to Figure 11 As shown, the core fixing ring 322 and the stator bracket 311 can also be connected by using the cooperation of the protrusion 3211 and the groove 3221 mentioned above.

[0154] It should be understood that in some embodiments, the stator core 321 and the core fixing ring 322, as well as between the core fixing ring 322 and the stator bracket 311, can also be connected by fasteners such as screws and bolts.

[0155] In some embodiments, one end of the stator core 321 facing away from the core fixing ring 322 can also be fixed to the sleeve 314.

[0156] Figure 13 An internal schematic diagram of a stator bracket 311 is shown. Figure 14 A partial internal schematic diagram of a stator bracket 311 is shown. Figure 15 This is a partial schematic diagram of a bracket assembly 31 provided by an embodiment of the present application.

[0157] See Figures 13 to 15 As shown, in some embodiments, the bracket assembly 31 further has a liquid supply channel 34 and a liquid inlet channel 35. The inlet of the liquid supply channel 34 is communicated with the outlet of the liquid inlet channel 35.

[0158] The liquid supply channel 34 extends circumferentially along the outer side of the stator core assembly 32. Among them, the outer circumferential direction of the stator core assembly 32 can be understood as the side of the stator core assembly 32 facing the liquid cooling cavity 310a in the circumferential direction W.

[0159] Figure 16 This is a partial schematic diagram of a power motor 30 provided by an embodiment of the present application Figure 2 , Figure 17 A structural schematic diagram of a stator bracket 311 is shown.

[0160] See Figure 14 , Figure 16 and Figure 17 As shown, the channel wall of the liquid supply channel 34 has a plurality of liquid supply ports 342 distributed at intervals along the extending direction of the liquid supply channel 34. The liquid supply channel 34 is communicated with the liquid cooling cavity 310a through the liquid supply ports 342, so as to realize the communication between the liquid inlet channel 35 and the liquid cooling cavity 310a through the liquid supply channel 34. In this way, the cooling medium can enter the liquid supply channel 34 through the liquid inlet channel 35, and when flowing in the liquid supply channel 34 along the circumferential direction W of the stator core assembly 32, it can be output into the liquid cooling cavity 310a from different directions of the circumferential direction W of the stator core assembly 32 through different liquid supply ports 342 on the liquid supply channel 34. After the cooling medium enters the liquid cooling cavity 310a, it can cover the coil windings 331 in the stator winding assembly 33, be in direct contact with the coil windings 331, take away the heat of the coil windings 331, and realize the heat dissipation of the coil windings 331 and the stator winding assembly 33.

[0161] See Figure 17 and in combination with Figure 15As shown, the flow-through area of the liquid supply port 342 near the inlet of the liquid supply channel 34 is smaller than the flow-through area of the liquid supply port 342 far from the inlet of the liquid supply channel 34.

[0162] It should be noted that the flow-through area of the liquid supply port 342 mentioned in this application can be understood as the area through which the cooling medium can pass inside the liquid supply port 342, and this flow-through area can also be understood as the opening area of the liquid supply port 342.

[0163] Due to the existence of the liquid supply port 342, part of the pressure of the cooling medium will be released through the liquid supply port 342 when it flows in the liquid supply channel 34. Define the end of the liquid supply channel 34 away from the inlet as the distal end. When the cooling medium flows in the liquid supply channel 34 towards the distal end of the liquid supply channel 34 for a longer time, more pressure may be released, and the flow rate reaching the distal end of the liquid supply channel 34 will also be smaller. If there is a liquid supply port 342 at the distal end of the liquid supply channel 34, it will affect the output volume of the cooling medium at the distal end of the liquid supply channel 34, and thus affect the heat dissipation ability of the cooling medium output at the distal end of the liquid supply channel 34.

[0164] On the contrary, in this application, when the flow-through area of the liquid supply port 342 near the inlet of the liquid supply channel 34 is smaller than the flow-through area of the liquid supply port 342 far from the inlet of the liquid supply channel 34, the pressure drop of the cooling medium output from the liquid supply port 342 at the distal end of the liquid supply channel 34 can be made smaller, so as to narrow the flow rate gap between the cooling medium output from the liquid supply port 342 at the distal end of the liquid supply channel 34 and the liquid supply port 342 on the side near its own inlet.

[0165] In this way, it is beneficial to improve the uniformity of the cooling medium output from the liquid supply port 342 on the liquid supply channel 34, so that after the cooling medium flows in the liquid supply channel 34 and enters the liquid cooling cavity 310a, it can cover the stator winding assembly 33 and immerse the stator winding assembly 33 in the cooling medium, so that the cooling medium can directly contact the inside and outside of the coil winding 331, flow comprehensively and evenly through the surface of the coil winding 331, take away the heat of the coil winding 331, make the cooling (temperature) of each part in the circumferential direction W of the stator winding assembly 33 relatively uniform, fully dissipate the heat of each part of the stator winding assembly 33, and improve the heat dissipation effect of the stator winding assembly 33 and the working performance of the power motor 30. At the same time, since the stator winding assembly 33 is immersed in the cooling medium, the utilization rate of the cooling medium can also be improved.

[0166] In some examples, to ensure that the flow-through area of the liquid supply port 342 near the inlet of the liquid supply channel 34 is smaller than the flow-through area of the liquid supply port 342 far from the inlet of the liquid supply channel 34, in the direction from the inlet of the liquid supply channel 34 close to the liquid supply port 342 to the inlet far from the liquid supply channel 34, the flow-through area of the liquid supply port 342 can gradually increase.

[0167] Alternatively, in some other examples, when designing the liquid supply channel 34, it is also possible to not follow the rule that the flow-through area of the liquid supply port 342 gradually increases as mentioned above, based on the condition that the flow-through area of the liquid supply port 342 near the inlet of the liquid supply channel 34 is smaller than that of the liquid supply port 342 far from the inlet of the liquid supply channel 34.

[0168] See Figure 15 As shown, in some embodiments, in the extending direction of the liquid supply channel 34, the inlet of the liquid supply channel 34 can be located at the middle section position of itself. The middle section position of the liquid supply channel 34 refers to the position close to the middle of the liquid supply channel 34 itself. Liquid supply ports 342 are provided on the channel walls of the liquid supply channel 34 on both sides of the inlet of the liquid supply channel 34. For example, a plurality of liquid supply ports 342 can be provided on the channel walls on both sides of the inlet of the liquid supply channel 34. At this time, the liquid supply channel 34 has two distal ends.

[0169] By setting the inlet of the liquid supply channel 34 to be located at the middle section position of itself, when the cooling medium flows in the liquid supply channel 34, the cooling medium can flow in two different directions in the liquid supply channel 34 towards the corresponding distal ends and flow into the liquid cooling cavity 310a, so that the cooling medium can have a smaller pressure difference between the distal end and the inlet of the liquid supply channel 34. This can make the flow rates of the cooling medium output from each liquid supply port 342 of the liquid supply channel 34 more uniform, and can further improve the uniformity of heat dissipation of the cooling medium to the stator winding assembly 33.

[0170] See Figure 15 As shown, in some embodiments, the liquid supply channel 34 includes at least two liquid supply sections 341 distributed along the circumferential direction W of the stator core assembly 32. The liquid supply sections 341 extend along the outer circumferential direction of the stator core assembly 32. The liquid supply sections 341 communicate with the liquid cooling cavity 310a.

[0171] Specifically, the channel wall of the liquid supply section 341 has a plurality of liquid supply ports 342 distributed at intervals along the extending direction of the liquid supply section 341. The liquid supply section 341 communicates with the liquid cooling cavity 310a through the liquid supply ports 342, so that the cooling medium can be output to the liquid cooling cavity 310a along the radial direction X of the stator core assembly 32 through the plurality of liquid supply ports 342 of the same liquid supply section 341, so as to quickly cover the coil winding 331 and dissipate heat from the stator winding assembly 33.

[0172] In some embodiments, in the same liquid supply section 341, the flow-through area of the liquid supply port 342 near the inlet of the liquid supply section 341 is smaller than that of the liquid supply port 342 far from the inlet of the liquid supply section 341. In this way, while realizing the communication between the liquid supply section 341 of the liquid supply channel 34 and the liquid cooling cavity 310a, it can be ensured that the flow-through area of the liquid supply port 342 near the inlet of the liquid supply section 341 is smaller than that of the liquid supply port 342 far from the inlet of the liquid supply section 341.

[0173] For example, in some examples, in the same liquid supply section 341, in the direction from the inlet of the liquid supply section 341 close to the inlet to the inlet far from the liquid supply section 341, the flow-through area of the liquid supply port 342 can gradually increase to ensure that the flow-through area of the liquid supply port 342 close to the inlet of the liquid supply section 341 is smaller than the flow-through area of the liquid supply port 342 far from the inlet of the liquid supply section 341.

[0174] See Figure 15 As shown, in addition to the liquid supply flow channel 34 and the liquid inlet flow channel 35, the support assembly 31 also has a bypass flow channel 36. The liquid supply flow channel 34, the liquid inlet flow channel 35, and the bypass flow channel 36 are located on the stator support 311 to realize the arrangement of the liquid supply flow channel 34, the liquid inlet flow channel 35, and the bypass flow channel 36 on the support assembly 31. At this time, the liquid supply port 342 is also provided on the stator support 311.

[0175] The inlet of one of the at least two liquid supply sections 341 is communicated with the outlet of the liquid inlet flow channel 35. The inlets of the remaining liquid supply sections 341 among the at least two liquid supply sections 341 are communicated with the bypass flow channel 36, and the inlet of the bypass flow channel 36 is communicated with the liquid inlet flow channel 35, so that the inlets of the remaining liquid supply sections 341 among the at least two liquid supply sections 341 are communicated with the liquid inlet flow channel 35 through the bypass flow channel 36. In this way, the cooling medium can enter the bypass flow channel 36 from the outlet of the liquid inlet flow channel 35 and enter the liquid supply section 341 communicated with the bypass flow channel 36 through the bypass flow channel 36.

[0176] By distributing at least two liquid supply sections 341 along the circumferential direction W of the stator core assembly 32, the cooling medium can be input into the stator winding assembly 33 from different positions in the circumferential direction W of the stator core assembly 32, so as to realize the coating of the stator winding assembly 33 in the circumferential direction W, and make the heat dissipation (temperature) of each part of the stator winding assembly 33 in the circumferential direction W more uniform.

[0177] Since the liquid inlet flow channel 35 is arranged at a position of the support assembly 31 close to the edge of the circumferential direction W, when at least two liquid supply sections 341 are distributed along the circumferential direction W of the stator core assembly 32, some of the liquid supply sections 341 will be relatively far from the outlet of the liquid inlet flow channel 35. If at least two liquid supply sections 341 are distributed along the circumferential direction W of the stator core assembly 32 and two adjacent liquid supply sections 341 are communicated with each other, at this time, the distal end of the liquid supply flow channel 34 will be farther from the outlet of the liquid inlet flow channel 35, and the flow rate of the cooling medium output from the distal end of the liquid supply flow channel 34 will still be small.

[0178] In contrast, in the present application, through the setting of the bypass flow channel 36, when the cooling medium is output through the bypass flow channel 36 and the liquid supply section 341 communicating with the bypass flow channel 36 and enters the liquid cooling cavity 310a, the liquid supply section 341 at a position farther from the outlet of the liquid inlet flow channel 35 can be supplied with liquid through the bypass flow channel 36. Moreover, since no liquid supply port 342 is provided on the bypass flow channel 36, the pressure difference when the cooling medium flows from the outlet of the liquid inlet flow channel 35 through the bypass flow channel 36 to the inlet of the liquid supply section 341 can be reduced. This can further improve the uniformity of the flow rate of the cooling medium output from each liquid supply port 342 of the liquid supply flow channel 34, and can further improve the uniformity of heat dissipation of the cooling medium to the stator winding assembly 33.

[0179] See Figure 15 As shown, in some embodiments, since the bypass flow channel 36 can reduce the pressure difference when the cooling medium flows from the outlet of the liquid inlet flow channel 35 through the bypass flow channel 36 to the inlet of the liquid supply section 341, the uniformity of the flow rate of the cooling medium output from each liquid supply port 342 of the liquid supply flow channel 34 is improved.

[0180] Therefore, in some embodiments, a liquid supply flow channel 34, a bypass flow channel 36, and a liquid inlet flow channel 35 can also be provided on the support assembly 31, and by providing at least two liquid supply sections 341 in the liquid supply flow channel 34, one of the liquid supply sections 341 among the at least two liquid supply sections 341 has its inlet communicated with the outlet of the liquid inlet flow channel 35, and the inlets of the remaining liquid supply sections 341 among the at least two liquid supply sections 341 are communicated with the bypass flow channel 36.

[0181] Moreover, at this time, the number of liquid supply ports 342 on the liquid supply section 341 does not need to be limited, and the uniformity of heat dissipation of the cooling medium to the stator winding assembly 33 can also be improved. It should be noted that for this embodiment, when there are multiple liquid supply ports 342 on the liquid supply section 341, the arrangement of the multiple liquid supply ports 342 and the design of the flow-through area can refer to the relevant descriptions above.

[0182] Taking the embodiment in which the support assembly 31 simultaneously has a liquid inlet flow channel 35, a bypass flow channel 36, and a liquid supply flow channel 34 (including at least two liquid supply sections 341) as an example, the structures of the support assembly 31 and the power motor 30 will be further elaborated below.

[0183] Figure 18 and Figure 19 show the schematic structural diagrams of the stator support 311 in the part of the liquid supply section 341 and the liquid inlet flow channel 35 from different perspectives.

[0184] See Figure 18 and Figure 19As shown, in the extending direction of the liquid supply channel 34, at least two adjacent liquid supply sections 341 are separately arranged so that, in the extending direction of the liquid supply channel 34, the adjacent liquid supply sections 341 are not connected to each other.

[0185] For example, the liquid supply channel 34 may be disconnected between the adjacent liquid supply sections 341 so that, in the extending direction of the liquid supply channel 34, there is a spacing between the adjacent liquid supply sections 341, thereby separating the adjacent liquid supply sections 341.

[0186] Alternatively, a blocking structure may be arranged between the adjacent liquid supply sections 341 inside the liquid supply channel 34. The blocking structure presses against the inner side of the channel wall of the liquid supply channel 34, thereby blocking the connection between the adjacent liquid supply sections 341 and separating the adjacent liquid supply sections 341.

[0187] Compared with the situation where the adjacent liquid supply sections 341 are connected, when the adjacent liquid supply sections 341 are not connected in the extending direction of the liquid supply channel 34, it can be ensured that the cooling media do not affect each other in the adjacent liquid supply sections 341, so as to ensure that the cooling media can be output through the liquid supply ports 342 of the corresponding liquid supply sections 341 and enter the liquid cooling cavity 310a uniformly in the radial direction X of the stator core assembly 32 to wrap and infiltrate the iron core winding assembly, ensuring the uniformity of heat dissipation of each part of the iron core winding assembly. At the same time, when the adjacent liquid supply sections 341 are not connected in the extending direction of the liquid supply channel 34, it is also easier to control the flow rate of the cooling media output from the liquid supply ports 342 on the adjacent liquid supply sections 341.

[0188] The at least two liquid supply sections 341 include a first liquid supply section 341a and a second liquid supply section 341b. The inlet of the first liquid supply section 341a is connected to the outlet of the liquid inlet channel 35. The inlet of the second liquid supply section 341b is connected to the bypass channel 36. That is to say, the liquid supply channel 34 includes the first liquid supply section 341a and the second liquid supply section 341b distributed along the circumferential direction W of the stator core assembly 32. At this time, the cooling media can enter the first liquid supply section 341a and the second liquid supply section 341b respectively through the outlet of the liquid inlet channel 35, and are output through the liquid supply ports 342 on the first liquid supply section 341a and the second liquid supply section 341b respectively and enter the liquid cooling cavity 310a to dissipate heat from the coil winding 331.

[0189] For the convenience of description, in the following text, a liquid supply section 341 whose inlet is connected (directly connected) to the outlet of the liquid inlet channel 35 among the at least two liquid supply sections 341 is called the first liquid supply section 341a, and a liquid supply section 341 whose inlet is connected to the outlet of the liquid inlet channel 35 through the bypass channel 36 among the at least two liquid supply sections 341 is called the second liquid supply section 341b.

[0190] It should be noted that Figure 18Only a second liquid supply section 341b is provided. For example, in some embodiments, the number of the second liquid supply sections 341b on the bracket assembly 31 can be two, three, etc.

[0191] Taking two second liquid supply sections 341b as an example, the two second liquid supply sections 341b can also be arranged at intervals along the circumferential direction W of the stator core assembly 32, and the inlets of the two second liquid supply sections 341b can be respectively communicated with the outlet of the liquid inlet flow channel 35 through a bypass flow channel 36.

[0192] Taking the bracket assembly 31 having one second liquid supply section 341b as an example below, the structures of the bracket assembly 31 and the power motor 30 will be further described.

[0193] When the liquid supply flow channel 34 includes a first liquid supply section 341a and a second liquid supply section 341b, when the first liquid supply section 341a and the second liquid supply section 341b are separated from each other in the circumferential direction W of the stator core assembly 32, the first liquid supply section 341a and the second liquid supply section 341b can be arranged opposite to each other along the radial direction X of the stator core assembly 32, or the inlet of the first liquid supply section 341a and the inlet of the second liquid supply section 341b can be arranged opposite to each other along the radial direction X of the stator core assembly 32. With such an arrangement, the liquid supply flow channels 34 can be evenly distributed on the circumferential side of the iron core winding assembly. Through the bypass flow channel 36, the flow rates of the cooling medium flowing out from the liquid supply ports 342 at the positions closest to and farthest from the outlet of the liquid inlet flow channel 35 can be made relatively uniform, which is beneficial to improving the uniformity of the cooling medium flowing out from the liquid supply ports 342 spaced apart in the entire circumferential direction W of the bracket assembly 31.

[0194] Reference Figure 18 As shown, in the extending direction of the liquid supply section 341, the inlet of the liquid supply section 341 can be located at the middle section position of itself. The middle section position of the liquid supply section 341 refers to the position close to the middle of the liquid supply section 341 itself. Liquid supply ports 342 are formed on the flow channel walls on both sides of the inlet of the liquid supply section 341. That is to say, in the extending direction of the first liquid supply section 341a, the inlet of the first liquid supply section 341a can be located at the middle section position of itself. In the extending direction of the second liquid supply section 341b, the inlet of the second liquid supply section 341b can be located at the middle section position of itself.

[0195] By limiting the inlet position of the liquid supply section 341, when the cooling medium flows in the liquid supply section 341, the cooling medium can flow in two different directions in the liquid supply section 341 towards the corresponding distal ends and flow into the liquid cooling cavity 310a, so that the cooling medium can have a smaller pressure difference between the distal end and the inlet of the liquid supply section 341. This can make the flow rates of the cooling medium output from the respective liquid supply ports 342 of the liquid supply section 341 relatively uniform, and can further improve the uniformity of the cooling medium in dissipating heat from the stator winding assembly 33.

[0196] In some embodiments, when the first liquid supply section 341a and the second liquid supply section 341b are disposed opposite to each other along the radial direction X of the stator core assembly 32, along the axial direction Z of the stator core assembly 32, the first cover 312 can be disposed at one end of the stator bracket 311 where the first liquid supply section 341a is provided, and the second cover 313 can be disposed at the end of the stator bracket 311 away from the first liquid supply section 341a. At this time, referring to Figure 9 as shown, a liquid outlet 315 can be provided on the second cover 313 so that the cooling medium flows along the axial direction Z of the stator core assembly 32 through the coil winding 331 in the core winding assembly, takes away the heat of the coil winding 331, and then outputs from the liquid outlet 315 to the liquid cooling cavity 310a, so that the cooling medium can be reused after heat dissipation, improving the utilization rate of the cooling medium.

[0197] Alternatively, in some embodiments, the liquid outlet 315 can also be provided on the first cover 312. That is to say, the liquid outlet 315 can be provided on the first cover 312 or the second cover 313.

[0198] Referring to Figure 19 and in combination with Figure 8 as shown, in some embodiments, in the radial direction X of the stator core assembly 32, the inlet liquid flow channel 35 can be located on the side of the liquid supply flow channel 34 and the bypass flow channel 36 away from the liquid cooling cavity 310a to avoid interference between the inlet liquid flow channel 35 and the core winding assembly in the liquid cooling cavity 310a.

[0199] Figure 20 Fig. shows a partial schematic view of the stator bracket 311 on one side of the inlet liquid flow channel 35.

[0200] Referring to Figure 20 as shown, in some embodiments, the opening direction of the outlet of the inlet liquid flow channel 35 can be along the radial direction X of the stator core assembly 32 and towards the liquid cooling cavity 310a, so that after output from the outlet of the cooling medium inlet liquid flow channel 35, the flow along both sides of the circumferential direction W of the stator core assembly 32 (such as the two far ends of the first liquid supply section 341a) is relatively uniform.

[0201] Referring to Figure 20 as shown, in some embodiments, the bracket assembly 31 can further have a first sub-guide liquid flow channel 3721. Among them, the first sub-guide liquid flow channel 3721 extends along the axial direction Z of the stator core assembly 32.

[0202] For the liquid supply section 341 whose inlet is communicated with the outlet of the inlet liquid flow channel 35: the outlet of the inlet liquid flow channel 35 is communicated with the inlet of the first sub-guide liquid flow channel 3721, and the outlet of the first sub-guide liquid flow channel 3721 is communicated with the inlet of the liquid supply section 341, so as to realize the communication between the outlet of the inlet liquid flow channel 35 and the inlet of the first liquid supply section 341a through the first sub-guide liquid flow channel 3721.

[0203] By providing the first sub-guide flow channel 3721, the relative positions of the inlet of the liquid supply section 341 and the outlet of the liquid inlet flow channel 35 in the axial direction Z of the stator core assembly 32 can be made more flexible. At the same time, since the first sub-guide flow channel 3721 extends along the axial direction Z of the stator core assembly 32, the cooling medium output from the outlet of the liquid inlet flow channel 35 can also be diffused along the axial direction Z of the stator core assembly 32 within the first sub-guide flow channel 3721, so that more cooling medium can be uniformly guided to both sides in the circumferential direction W of the stator winding assembly 33 along the circumferential direction W of the stator core assembly 32, enhancing the uniformity of the flow of the cooling medium along both sides in the circumferential direction W of the stator winding assembly 33.

[0204] Refer to Figure 20 As shown, in some embodiments, the outlet of the liquid inlet flow channel 35 may include a first port 351 and a second port 352. For the liquid supply section 341 whose inlet is in communication with the outlet of the liquid inlet flow channel 35: The first port 351 may be in communication with the inlet of the liquid supply section 341. For example, the first port 351 may be in communication with the inlet of the first liquid supply section 341a. The second port 352 may be in communication with the inlet of the bypass flow channel 36, so as to realize the communication between the outlet of the liquid inlet flow channel 35 and the inlets of the first liquid supply section 341a and the bypass flow channel 36 respectively.

[0205] Compared with the first liquid supply section 341a, due to the introduction of the bypass flow channel 36, the path for the cooling medium input from the outlet of the liquid inlet flow channel 35 to enter the second liquid supply section 341b is longer, and there is a certain flow resistance during the flow process, which may cause the flow rate of the cooling medium when entering the second liquid supply section 341b to become smaller. The flow-through area of the first port 351 may be equal to the flow-through area of the second port 352, but this may cause the flow rate of the cooling medium output from the liquid supply port 342 of the second liquid supply section 341b to be less than the flow rate of the cooling medium output from the liquid supply port 342 of the first liquid supply section 341a.

[0206] Therefore, in some embodiments, the flow-through area of the first port 351 may be smaller than the flow-through area of the second port 352, so as to ensure that the flow rate of the cooling medium input into the bypass flow channel 36 via the outlet of the liquid inlet flow channel 35 is larger, thereby overcoming the resistance during the flow in the bypass flow channel 36, and being able to reduce the difference between the flow rate of the cooling medium output from the liquid supply port 342 of the second liquid supply section 341b and the flow rate of the cooling medium output from the liquid supply port 342 of the first liquid supply section 341a, making the flow rate of the cooling medium output from the liquid supply port 342 of the second liquid supply section 341b and the flow rate of the cooling medium output from the liquid supply port 342 of the first liquid supply section 341a uniform.

[0207] In some embodiments, when the flow-through area of the first port 351 can be smaller than that of the second port 352, the flow-through area of the liquid supply section 341 (the first liquid supply section 341a) where the inlet is connected to the outlet of the liquid supply channel 35 can also be larger than or equal to the flow-through area of the first port 351, and the flow-through area of the bypass channel 36 and the liquid supply section 341 (the second liquid supply section 341b) connected to the bypass channel 36 can also be larger than or equal to the flow-through area of the second port 352. With such an arrangement, the cooling medium can quickly enter the liquid cooling cavity 310a via the first liquid supply section 341a, or quickly enter the liquid cooling cavity 310a via the bypass channel 36 and the second liquid supply section 341b, improving the heat dissipation efficiency of the iron core winding assembly.

[0208] See Figure 20 As shown, in some embodiments, the bypass channel 36 can extend along the circumferential direction W of the stator core assembly 32, and the bypass channel 36 and the liquid supply channel 34 are arranged in sequence along the axial direction Z of the stator core assembly 32. For example, along the axial direction Z of the stator core assembly 32, the bypass channel 36 can be arranged on the side of the stator bracket 311 facing the second end cover 313.

[0209] By defining the extension direction of the bypass channel 36 and its layout position relative to the liquid supply channel 34, on the basis of ensuring that the bypass channel 36 conducts the inlet of the second liquid supply section 341b and the outlet of the liquid supply channel 35, compared with the way of arranging the bypass channel 36 in a bent manner in the circumferential direction W of the stator core assembly 32, the length of the bypass channel 36 can also be controlled within a relatively short range to further reduce the pressure difference when the cooling medium is output from the liquid supply ports 342 of the first liquid supply section 341a and the second liquid supply section 341b.

[0210] Moreover, by defining the extension direction of the bypass channel 36 and its layout position relative to the liquid supply channel 34, the layout of the bypass channel 36 on the bracket assembly 31 can also be made easier.

[0211] Figure 21 Shows a schematic structural diagram of the stator bracket 311 at the outlet position of the bypass channel 36.

[0212] See Figure 20 and Figure 21 As shown, the outlet and the inlet of the bypass channel 36 can be respectively located at both ends of the extension direction of the bypass channel 36.

[0213] See Figure 21As shown, in the liquid supply section 341 (the second liquid supply section 341b) of the communication bypass flow channel 36, the liquid supply section 341 includes a first sub-section 3411 and a second sub-section 3412 distributed along the circumferential direction W of the stator core assembly 32. The flow direction of the cooling medium in the first sub-section 3411 is opposite to the flow direction of the cooling medium in the bypass flow channel 36, and the flow direction of the cooling medium in the second sub-section 3412 is the same as the flow direction of the cooling medium in the bypass flow channel 36. The cooling medium output from the outlet of the bypass flow channel 36 can be output from different radial directions X of the stator core assembly 32 through the liquid supply ports 342 on the first sub-section 3411 and the second sub-section 3412, so that the liquid supply section 341 of the communication bypass flow channel 36 can intake liquid from its middle position. In the circumferential direction W of the stator core assembly 32, the first sub-section 3411 and the bypass flow channel 36 can be located on the same side of the inlet of the second liquid supply section 341b, and the second sub-section 3412 and the bypass flow channel 36 can be located on different sides of the inlet of the second liquid supply section 341b.

[0214] The bracket assembly 31 also has a second sub-guide flow channel 3722. The outlet of the bypass flow channel 36 is communicated with one end of the first sub-section 3411 close to the second sub-section 3412 and one end of the second sub-section 3412 close to the first sub-section 3411 through the second sub-guide flow channel 3722. The second sub-guide flow channel 3722 is used to make the flow rate of the cooling medium flowing into the first sub-section 3411 uniform with the flow rate of the cooling medium flowing into the second sub-section 3412. With such a setting, the flow rate of the cooling medium output from the liquid supply ports 342 of the first sub-section 3411 and the second sub-section 3412 can be made relatively uniform, so as to ensure that the cooling medium has good heat dissipation performance for the iron core winding assembly when output from different liquid supply ports 342, and further improve the uniformity of heat dissipation at different parts of the iron core winding assembly in the circumferential direction W.

[0215] See Figure 21 As shown, in some embodiments, the second sub-guide flow channel 3722 may include a first sub-guide section 3723 and a second sub-guide section 3724. The first sub-section 3411 is communicated with the bypass flow channel 36 through the first sub-guide section 3723. The second sub-section 3412 is communicated with the bypass flow channel 36 through the second sub-guide section 3724. Through the settings of the first sub-guide section 3723 and the second sub-guide section 3724, the second sub-guide flow channel 3722 can communicate the outlet of the bypass flow channel 36 with the first sub-section 3411 and the second sub-section 3412 respectively.

[0216] For example, the second sub-guide flow channel 3722 includes a liquid separation flow channel 373. The liquid separation flow channel 373 extends along the circumferential direction W of the stator core assembly 32, and one end of the liquid separation flow channel 373 in the circumferential direction W of the stator core assembly 32 is communicated with the outlet of the bypass flow channel 36. In the circumferential direction W of the stator core assembly 32, the second sub-guide section 3724 is located at one end of the liquid separation flow channel 373 away from the outlet of the bypass flow channel 36, and the first sub-guide section 3723 is located between the outlet of the bypass flow channel 36 and the second sub-guide section 3724, and the first sub-guide section 3723 is separated from the second sub-guide section 3724. The inlet of the first sub-section 3411 is communicated with the liquid separation flow channel 373 through the first sub-guide section 3723, and the inlet of the second sub-section 3412 is communicated with the liquid separation flow channel 373 through the second sub-guide section 3724. Through the settings of the liquid separation flow channel 373, the first sub-guide section 3723 and the second sub-guide section 3724, the outlet of the bypass flow channel 36 can be respectively communicated with the first sub-section 3411 and the second sub-section 3412.

[0217] The flow-through area of the first sub-guide section 3723 can be larger than that of the second sub-guide section 3724. Or, the flow-through area of the first sub-guide section 3723 can also be equal to that of the second sub-guide section 3724. Since the flow direction of the cooling medium in the second sub-section 3412 is the same as that of the cooling medium in the bypass flow channel 36, after the cooling medium flows out of the bypass flow channel 36, it can more easily enter the second sub-section 3412 through the second sub-guide section 3724. When the flow-through area of the first sub-guide section 3723 is equal to that of the second sub-guide section 3724, it may cause the flow rate of the cooling medium at the inlet of the first sub-section 3411 to be lower than the flow rate of the cooling medium at the inlet of the second sub-section 3412.

[0218] Therefore, compared with the situation where the flow-through area of the first sub-guide section 3723 is equal to that of the second sub-guide section 3724, when the flow-through area of the first sub-guide section 3723 is larger than that of the second sub-guide section 3724, it can ensure that the flow rate of the cooling medium at the inlet of the first sub-section 3411 is uniform with the flow rate of the cooling medium at the inlet of the second sub-section 3412, so that the flow rate of the cooling medium output from the liquid supply ports 342 of the first sub-section 3411 and the second sub-section 3412 is relatively uniform.

[0219] See Figure 19 As shown, the bracket assembly 31 also has a liquid outlet 315, and the liquid outlet 315 is communicated with the liquid cooling cavity 310a, so that after the cooling medium dissipates heat from the iron core winding assembly, it can flow out of the liquid cooling cavity 310a through the liquid outlet 315. After the cooling medium is dissipated heat, it can enter the liquid cooling cavity 310a again through the inlet flow channel 35 to perform cyclic heat dissipation on the stator winding assembly 33, improving the utilization rate of the cooling medium.

[0220] In some examples, a plurality of liquid outlets 315 may be provided on the bracket assembly 31, and the plurality of liquid outlets 315 may be distributed at different positions of the stator bracket 311, so that the cooling medium can quickly dissipate heat after taking away the heat of the coil winding 331, and the utilization rate of the cooling medium is improved.

[0221] It should be noted that in the above embodiments, the bracket assembly 31 can at least enable the cooling medium in the liquid supply channel 34 to uniformly enter the liquid cooling cavity 310a along the circumferential direction W of the stator winding assembly 33 through the settings of the liquid supply channel 34 and the liquid inlet channel 35, so as to fully dissipate the heat of the coil winding 331, thereby improving the working performance of the power motor 30.

[0222] In the related art, in the axial direction of the stator core assembly, the heat dissipation of the stator winding assembly is uneven.

[0223] In some embodiments, different structural designs can also be made for the bracket assembly 31 to solve the problem of uneven heat dissipation of the stator winding assembly 33 in the axial direction of the stator core assembly 32, and the coil winding 331 in the stator winding assembly 33 can also be fully dissipated, thereby improving the working performance of the power motor 30.

[0224] Figure 22 and Figure 23 show different structural schematic diagrams of two stators in the communication channel 38. Figure 24 show a structural schematic diagram of a spray structure 39 in a power motor 30.

[0225] The following Figure 8 , Figures 19 to 24 , and specific embodiments are used to further elaborate on the differences between the bracket assembly 31 and the above embodiments.

[0226] Referring to Figure 8 as shown, in some embodiments, the cavity wall of the liquid cooling cavity 310a has a liquid outlet 315 and at least two liquid supply ports 342. In the axial direction Z of the stator core assembly 32, at least two liquid supply ports 342 are arranged at intervals. The liquid supply port 342 is used for supplying the cooling medium to flow into the liquid cooling cavity 310a. The liquid outlet 315 is used for the cooling medium in the liquid cooling cavity 310a to flow out.

[0227] By arranging at least two liquid supply ports 342 at intervals in the axial direction Z of the stator core assembly 32, the cooling medium output from the liquid inlet channel 35 can be output along the axial direction Z of the stator winding assembly 33 through at least two liquid supply ports 342 and enter the liquid cooling cavity 310a, so that the temperature in the axial direction Z of the liquid cooling cavity 310a for the stator winding assembly 33 can be more uniform, ensuring that the temperature of the stator winding assembly 33 in the axial direction Z of the stator core assembly 32 is more uniform, thereby enabling uniform heat dissipation of the coil winding 331 in the axial direction Z of the stator core assembly 32, improving the heat dissipation uniformity of the stator winding assembly 33 in the axial direction Z of the stator core assembly 32, and thus improving the working performance of the power motor 30.

[0228] See Figure 22 As shown, in some embodiments, the cavity wall of the liquid cooling cavity 310a may further have at least one liquid supply port 342. A communication channel 38 is provided in the liquid cooling cavity 310a. At least one liquid supply port 342 is communicated with the communication channel 38. In this way, when components such as the stator core assembly 32 block the liquid supply port 342 and affect the output of the cooling medium from the liquid supply port 342, the liquid supply port 342 can input the cooling medium into the liquid cooling cavity 310a through the communication channel 38 to achieve uniform heat dissipation of each part of the stator winding assembly 33, thereby improving the working performance of the power motor 30.

[0229] When the liquid supply port 342 is at least one or at least two, it all includes a first liquid supply port 3421. The stator core assembly 32 includes a first end 32a and a second end 32b, and the first end 32a and the second end 32b are respectively located at both ends of the stator core assembly 32 in the axial direction Z. The first end 32a and the second end 32b can be understood as the parts at both ends of the stator core assembly 32 in the axial direction Z, rather than two end faces.

[0230] On the axial direction Z of the stator core assembly 32, the first liquid supply port 3421 is located between the first end 32a and the second end 32b, so that the cooling medium can be output between the first end 32a and the second end 32b through the first liquid supply port 3421 and enter the liquid cooling cavity 310a, which is beneficial to enhancing the temperature uniformity in the axial direction Z of the liquid cooling cavity 310a for the stator winding assembly 33 and dissipating heat from the area near the bottom of the coil winding 331 and the stator winding assembly 33.

[0231] It should be noted that the area near the bottom of the stator winding assembly 33 can be understood as the area of the stator winding assembly 33 adjacent to the first end 32a.

[0232] The first liquid supply port 3421 is connected to the communication flow channel 38, and the part of the liquid cooling cavity 310a that communicates with the liquid outlet 315 is connected to the communication flow channel 38 to realize the connection between the first liquid supply port 3421 and the liquid outlet 315. At the same time, since the first liquid supply port 3421 is located between the first end 32a and the second end 32b, it may be blocked by the stator core assembly 32. Through the connected setting in the embodiment of the present application, the stator core assembly 32 can be avoided from blocking the first liquid supply port 3421, so that the cooling medium can easily enter the liquid cooling cavity 310a to dissipate heat from the coil winding 331.

[0233] See Figure 22 As shown, in some embodiments, in the axial direction Z of the stator core assembly 32, there is a first spacer space 310b between the end of the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a. For example, there is a first spacer space 310b between the first end 32a of the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a.

[0234] The liquid outlet 315 can be connected to the first spacer space 310b. The first spacer space 310b is connected to the communication flow channel 38 so that the communication flow channel 38 can be connected to the part of the liquid cooling cavity 310a that communicates with the liquid outlet 315 through the first spacer space 310b. With such a setting, after the cooling medium flows in the communication flow channel 38 and absorbs the heat of the coil winding 331, it can flow to the liquid outlet 315 through the first spacer space 310b and finally be output from the liquid outlet 315 from the liquid cooling cavity 310a to realize the heat dissipation of the coil winding 331.

[0235] See Figure 22 As shown, when there is a first spacer space 310b between the end of the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a, in some examples, the stator core assembly 32 includes a first surface. Among them, the first surface of the stator core assembly 32 faces the cavity wall of the liquid cooling cavity 310a provided with the liquid supply port 342. The first surface of the stator core assembly 32 has a first groove 32c. The first groove 32c and the cavity wall of the liquid cooling cavity 310a provided with the liquid supply port 342 enclose to form the communication flow channel 38. For example, the first groove 32c and the cavity wall of the liquid cooling cavity 310a provided with the first liquid supply port 3421 enclose to form the communication flow channel 38.

[0236] Among them, the first groove 32c penetrates through the end of the stator winding assembly 33. For example, the first groove 32c penetrates through the first end 32a of the stator winding assembly 33. With such a setting, the cavity of the first groove 32c can be connected to the first spacer space 310b, so as to realize the connection between the communication flow channel 38 and the first spacer space 310b. In this way, after the cooling medium flows in the communication flow channel 38 and absorbs the heat of the coil winding 331, it can enter the first spacer space 310b and be output from the liquid outlet 315 from the liquid cooling cavity 310a.

[0237] Meanwhile, a communication flow channel 38 is formed by enclosing the cavity wall with a liquid supply port 342 provided through the first groove 32c and the liquid cooling cavity 310a. When the cooling medium flows in the communication flow channel 38, after exchanging heat with the stator core assembly 32 and the coil winding 331 wound around the stator core assembly 32 through a relatively long path, it then enters the first interval space 310b, which can sufficiently dissipate heat from the coil winding 331, improve the heat dissipation effect on the coil winding 331, and at the same time, improve the utilization rate of the cooling medium.

[0238] See Figure 22 As shown, when there is a first interval space 310b between the end of the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a, in some other examples, the liquid cooling cavity 310a has a second groove 3111 on the cavity wall provided with the liquid supply port 342. Among them, the second groove 3111 and the stator core assembly 32 enclose to form a communication flow channel 38, and the groove wall of the second groove 3111 has the liquid supply port 342. On the axial direction Z of the stator core assembly 32, one end of the second groove 3111 is located between the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a, so that the cavity of the second groove 3111 communicates with the first interval space 310b.

[0239] For example, the liquid cooling cavity 310a has a second groove 3111 on the cavity wall provided with the first liquid supply port 3421, and the first liquid supply port 3421 is located on the groove wall of the second groove 3111. On the axial direction Z of the stator core assembly 32, the first end 32a of the stator core assembly 32 is located between the two ends of the second groove 3111, so that the cavity of the second groove 3111 communicates with the first interval space 310b.

[0240] By limiting the position of the second groove 3111 in the present application, the cavity of the second groove 3111 can be made to communicate with the first interval space 310b, thereby realizing the communication between the communication flow channel 38 and the first interval space 310b. In this way, it can also make the cooling medium flow in the communication flow channel 38 to absorb the heat of the coil winding 331, and then can be output from the liquid cooling cavity 310a via the first interval space 310b and the liquid outlet 315.

[0241] Meanwhile, it can also make the cooling medium flow in the communication flow channel 38 to sufficiently dissipate heat from the coil winding 331, improve the heat dissipation effect on the coil winding 331, and at the same time, improve the utilization rate of the cooling medium. The reason can be seen in the relevant description of the first groove 32c above and will not be elaborated here.

[0242] See Figure 23As shown, in some embodiments, the stator core assembly 32 has communication holes that form a communication flow channel 38. By providing the communication holes, the communication between the liquid supply port 342 and the liquid cooling cavity 310a is also achieved, so that when the cooling medium is output through the liquid supply port 342, it can enter the communication holes and then enter the liquid cooling cavity 310a, making full contact with the coil winding 331 and dissipating heat.

[0243] As described above, the stator core assembly 32 includes a core fixing ring 322. The core fixing ring 322 includes a first surface and a second surface. The first surface and the second surface of the core fixing ring 322 are respectively located on both sides of the core fixing ring 322 in the radial direction. The radial direction of the core fixing ring 322 can also refer to the direction X.

[0244] See Figure 23 As shown, the communication holes penetrate through the first surface and the second surface, and one end of the communication hole located on the first surface of the core fixing ring 322 is communicated with the first liquid supply port 3421. Specifically, the first surface of the core fixing ring 322 faces the cavity wall of the liquid cooling cavity 310a where the liquid supply port 342 is provided, so that one end of the communication hole located on the first surface is communicated with the first liquid supply port 3421. There is a second spaced-apart space 310c between the second surface and the cavity wall of the liquid cooling cavity 310a, and one end of the communication hole located on the second surface is communicated with the second spaced-apart space 310c, and the second spaced-apart space 310c is communicated with the liquid outlet 315. With such a setting, the cooling medium output from the first liquid supply port 3421 can flow along the communication hole into the second spaced-apart space 310c, facilitating efficient heat dissipation of the coil winding 331.

[0245] Taking the support assembly 31 having at least two liquid supply ports 342 as an example, the differences between the support assembly 31 and the above embodiments will be further elaborated below.

[0246] See Figure 22 and Figure 23 As shown, at least two liquid supply ports 342 include a second liquid supply port 3422. For example, at least two liquid supply ports 342 can include a plurality of second liquid supply ports 3422.

[0247] In some examples, on the axial direction Z of the stator core assembly 32, the second liquid supply port 3422 is located on the side of the second end 32b of the stator core assembly 32 away from the first end 32a, so that when the cooling medium output from the second liquid supply port 3422 flows along the axial direction Z of the stator core assembly 32, it can increase the contact area of the cooling medium output from the second liquid supply port 3422 with the coil winding 331, so as to dissipate heat from various positions of the coil winding 331 in the axial direction Z of the stator core assembly 32.

[0248] See Figure 24As shown, when at least two liquid supply ports 342 include the second liquid supply port 3422, in some other examples, a spraying structure 39 may further be provided on the cavity wall of the liquid cooling cavity 310a. Axially along the Z-axis of the stator core assembly 32, the spraying structure 39 is close to the second end 32b of the stator core assembly 32. For example, the spraying structure 39 may be located on the side of the second end 32b of the stator core assembly 32 away from the first end 32a. The second liquid supply port 3422 is communicated with the spraying structure 39, and the spraying ports of the spraying structure 39 are communicated with the liquid cooling cavity 310a. The spraying ports of the spraying structure 39 are used for spraying towards the stator core assembly 32. In this way, the cooling medium entering the spraying structure 39 can be sprayed onto the coil winding 331 wound around the stator core assembly 32 through a plurality of spraying ports, which can increase the contact area of the cooling medium output from the second liquid supply port 3422 with the coil winding 331 in the radial X direction of the stator core assembly 32, making the heat dissipation of the coil winding 331 more uniform at each position in the radial X direction of the stator core assembly 32, and further improving the heat dissipation effect of the cooling medium output from the second liquid supply port 3422 on the coil winding 331.

[0249] In some examples, since axially along the Z-axis of the stator core assembly 32, the first cover 312 is adjacent to the side of the second end 32b of the stator core assembly 32 away from the first end 32a, therefore, the spraying structure 39 can be provided on the first cover 312 so that the spraying structure 39 is communicated with the second liquid supply port 3422. For example, the spraying structure 39 may be a spraying flow channel in the first cover 312, and a plurality of spraying ports are provided on the flow channel wall of the spraying flow channel. The plurality of spraying ports may be arranged in the radial X direction of the stator core assembly 32 on the flow channel wall of the spraying flow channel to ensure that the cooling medium output through the plurality of spraying ports can be sprayed towards the stator core assembly 32 in the radial X direction of the stator core assembly 32.

[0250] See Figure 24 As shown, in some embodiments, when at least two liquid supply ports 342 include the second liquid supply port 3422, the at least two liquid supply ports 342 may include a first liquid supply port 3421 and a second liquid supply port 3422. Axially along the Z-axis of the stator core assembly 32, the first liquid supply port 3421 and the second liquid supply port 3422 are arranged at intervals, and the liquid outlet 315 is located on the side of the first liquid supply port 3421 away from the second liquid supply port 3422. For example, when axially along the Z-axis of the stator core assembly 32, the first liquid supply port 3421 is located between the first end 32a and the second end 32b, and the second liquid supply port 3422 is located on the side of the second end 32b away from the first end 32a, the first liquid supply port 3421 and the second liquid supply port 3422 can be arranged at intervals.

[0251] By defining the arrangement of the first liquid supply port 3421 and the second liquid supply port 3422 along the axial direction Z of the stator core assembly 32, and the position of the liquid outlet 315 relative to the first liquid supply port 3421, it can be ensured that, along the axial direction Z of the stator core assembly 32, the second liquid supply port 3422 is located above the first liquid supply port 3421, and the first liquid supply port 3421 is located between the second liquid supply port 3422 and the liquid outlet 315.

[0252] The cooling medium output from the second liquid supply port 3422 can dissipate heat from the coil winding 331 at the second end 32b of the stator core assembly 32, and the cooled cooling medium can flow towards the liquid outlet 315 along the axial direction Z of the stator core assembly 32.

[0253] The cooling medium output from the first liquid supply port 3421 can dissipate heat from the coil winding 331 starting from the middle region between the second end 32b and the first end 32a of the stator core assembly 32. The cooled cooling medium can also flow towards the liquid outlet 315 along the axial direction Z of the stator core assembly 32 to reduce the temperature difference in the liquid cooling cavity 310a along the axial direction Z of the stator core assembly 32. This can make full use of the cooling medium output from the first liquid supply port 3421 and the second liquid supply port 3422, improve the heat dissipation uniformity of the coil winding 331 along the axial direction Z of the stator core assembly 32, and further improve the utilization rate of the cooling medium.

[0254] In some embodiments, the flow area of the first liquid supply port 3421 can be smaller than that of the second liquid supply port 3422, so as to ensure the effective heat dissipation of the cooling medium output from the first liquid supply port 3421 to the coil winding 331 while avoiding excessive cooling medium output from the first liquid supply port 3421 and affecting the utilization rate of the cooling medium.

[0255] See Figure 19 As shown, in some embodiments, the bracket assembly 31 has an inlet liquid flow channel 35 and at least two liquid supply flow channels 34. Along the axial direction Z of the stator core assembly 32, the at least two liquid supply flow channels 34 are arranged in sequence. The flow channel wall of the liquid supply flow channel 34 has a liquid supply port 342. The liquid supply flow channel 34 is communicated with the liquid cooling cavity 310a through the liquid supply port 342, and the inlet of the liquid supply flow channel 34 is communicated with the outlet of the inlet liquid flow channel 35, so that after the cooling medium enters the at least two liquid supply flow channels 34 from the inlet liquid flow channel 35, it can supply liquid to the communicated liquid supply port 342.

[0256] See Figure 19As shown, in some embodiments, at least two liquid supply channels 34 include a first liquid supply channel 34a and a second liquid supply channel 34b. Along the axial direction Z of the stator core assembly 32, the first liquid supply channel 34a and the second liquid supply channel 34b are distributed in sequence, and the liquid outlet 315 is located on the side of the first liquid supply channel 34a away from the second liquid supply channel 34b. That is to say, along the axial direction Z of the stator core assembly 32, the first liquid supply channel 34a is located between the second liquid supply channel 34b and the liquid outlet 315. Among them, the liquid supply port 342 on the first liquid supply channel 34a can form a first liquid supply port 3421. The liquid supply port 342 on the second liquid supply channel 34b can form a second liquid supply port 3422.

[0257] By defining the positions of the first liquid supply channel 34a and the second liquid supply channel 34b, the first liquid supply port 3421 can be located between the second liquid supply port 3422 and the liquid outlet 315 along the axial direction Z of the stator core assembly 32. While improving the heat dissipation uniformity of the coil winding 331 along the axial direction Z of the stator core assembly 32, the utilization rate of the cooling medium can be further improved.

[0258] See Figure 15 、 Figure 20 and Figure 21 As shown, in some embodiments, at least one liquid supply channel 34 includes at least two liquid supply sections 341 distributed along the circumferential direction W of the stator core assembly 32. The flow channel wall of the liquid supply section 341 has a liquid supply port 342, and the liquid supply section 341 is communicated with the liquid cooling cavity 310a through the liquid supply port 342. In the same liquid supply channel 34, the inlet of one of the at least two liquid supply sections 341 is communicated with the outlet of the liquid inlet channel 35, and the inlets of the remaining liquid supply sections 341 among the at least two liquid supply sections 341 are communicated with the bypass channel 36, and the inlet of the bypass channel 36 is communicated with the liquid inlet channel 35.

[0259] For example, Figure 15 shows that the second liquid supply channel 34b includes at least two liquid supply sections 341 distributed along the circumferential direction W of the stator core assembly 32. The second liquid supply channel 34b can be the first liquid supply section 341a mentioned above, or the first liquid supply section 341a and the second liquid supply section 341b.

[0260] In some examples, the second liquid supply channel 34b can also include the first liquid supply section 341a, or the liquid supply channel 34 formed by the first liquid supply section 341a and the second liquid supply section 341b. Figure 15 shows that the second liquid supply channel 34b includes the first liquid supply section 341a and the second liquid supply section 341b. For the second liquid supply channel 34b, the inlet of the first liquid supply section 341a can be communicated with the outlet of the liquid inlet channel 35, and the inlet of the second liquid supply section 341b can be communicated with the outlet of the liquid inlet channel 35 through the bypass channel 36.

[0261] Through the arrangement of the bypass flow channel 36 in the liquid supply flow channel 34 and at least two liquid supply sections 341 in the liquid supply flow channel 34, the cooling of each part of the coil winding 331 and the stator winding assembly 33 in the circumferential direction W can be made more uniform, improving the working performance of the power motor 30. For the specific reasons, reference can be made to the relevant descriptions in the foregoing text, which will not be elaborated herein.

[0262] See Figure 15 , Figure 20 and Figure 21 As shown in, in some embodiments, in the axial direction Z of the stator core assembly 32, the outlet of the liquid inlet flow channel 35 is located between the inlet of the first liquid supply flow channel 34a and the inlet of the second liquid supply flow channel 34b. The bracket assembly 31 further has a diversion flow channel 37. The diversion flow channel 37 has a first diversion flow channel 371 and a second diversion flow channel 372. The outlet of the liquid inlet flow channel 35 is communicated with the inlet of the first liquid supply flow channel 34a through the first diversion flow channel 371, and the outlet of the liquid inlet flow channel 35 is communicated with the inlet of the second liquid supply flow channel 34b through the second diversion flow channel 372. Through the first diversion flow channel 371, the communication between the outlet of the liquid inlet flow channel 35 and the inlet of the first liquid supply flow channel 34a can be realized, and through the second diversion flow channel 372, the communication between the outlet of the liquid inlet flow channel 35 and the inlet of the second liquid supply flow channel 34b can be realized. In this way, the liquid inlet flow channel 35 can supply liquid to the first liquid supply flow channel 34a and the second liquid supply flow channel 34b simultaneously, and the diversion path between the liquid inlet flow channel 35 and the first liquid supply flow channel 34a and the second liquid supply flow channel 34b is short, which is convenient for layout.

[0263] See Figure 20 and Figure 21 As shown in, the second diversion flow channel 372 may include the first sub-diversion flow channel 3721 and the second sub-diversion flow channel 3722 mentioned above. The communication between the first sub-diversion flow channel 3721 and the second sub-diversion flow channel 3722 between the liquid inlet flow channel 35 and the liquid supply section 341 of the second liquid supply flow channel 34b can be referred to the relevant descriptions in the foregoing text, which will not be elaborated herein.

[0264] See Figure 20 and Figure 21As shown, the first diversion flow channel 371 includes a third sub-diversion flow channel 3711. The third sub-diversion flow channel 3711 and the first sub-diversion flow channel 3721 are arranged at intervals along the axial direction Z of the stator core assembly 32 on the bracket assembly 31 (such as the stator bracket 311), and both extend along the axial direction Z of the stator core assembly 32 to the outlet of the liquid inlet flow channel 35 and communicate with the outlet of the liquid inlet flow channel 35. The first sub-diversion flow channel 3721 communicates the outlet of the liquid inlet flow channel 35 with the first liquid supply section 341a in the second liquid supply flow channel 34b, so that the cooling medium output from the outlet of the liquid inlet flow channel 35 can enter the first liquid supply section 341a in the second liquid supply flow channel 34b. The third sub-diversion flow channel 3711 communicates the outlet of the liquid inlet flow channel 35 with the first liquid supply section 341a in the first liquid supply flow channel 34a, so that the cooling medium output from the outlet of the liquid inlet flow channel 35 can enter the first liquid supply section 341a in the first liquid supply flow channel 34a.

[0265] The first diversion flow channel 371 further includes a fourth sub-diversion flow channel 3712. The inlet of the third sub-diversion flow channel 3711 and the fourth sub-diversion flow channel 3712 are oppositely arranged along the radial direction X of the stator core assembly 32 on the bracket assembly 31 (such as the stator bracket 311). The outlet of the bypass flow channel 36 is communicated with the inlet of the second liquid supply section 341b in the first liquid supply flow channel 34a through the fourth sub-diversion flow channel 3712, so that the cooling medium output from the outlet of the liquid inlet flow channel 35 can enter the inlet of the second liquid supply section 341b in the first liquid supply flow channel 34a via the bypass flow channel 36 and the fourth sub-diversion flow channel 3712, and flow along the first sub-section 3411 and the second sub-section 3412 of the second liquid supply section 341b, and is output to the liquid cooling cavity 310a through the liquid supply port 342 on the second liquid supply section 341b to dissipate heat from the coil winding 331.

[0266] See Figure 21 As shown, the fourth sub-diversion flow channel 3712 includes a third sub-diversion section 3713 and a fourth sub-diversion section 3714. The third sub-diversion section 3713 and the fourth sub-diversion section 3714 are respectively communicated with both ends of the liquid distribution flow channel 373 in the flow direction, and the third sub-diversion section 3713 is located on the side of the liquid distribution flow channel 373 adjacent to the bypass flow channel 36, and the fourth sub-diversion section 3714 is located on the side of the liquid distribution flow channel 373 adjacent to the third sub-diversion flow channel 3711. Among them, the flow area of the third sub-diversion section 3713 is larger than the flow area of the fourth sub-diversion section 3714, so that the flow rate of the cooling medium entering the third sub-diversion section 3713 and the fourth sub-diversion section 3714 via the bypass flow channel 36 is uniform.

[0267] Through the arrangement of the third sub-diversion flow channel 3711 and the fourth sub-diversion flow channel 3712, the connection between the outlet of the bypass flow channel 36 and the first sub-section 3411 and the second sub-section 3412 in the second liquid supply section 341b of the first liquid supply flow channel 34a can be realized.

[0268] It should be noted that after the cooling medium output from the outlet of the bypass flow channel 36 enters the liquid separation flow channel 373, it can flow to the first sub-guide flow channel 3721 to the fourth sub-guide flow channel 3712 respectively through the liquid separation flow channel 373, so that the cooling medium can flow into the second liquid supply section 341b of the first liquid supply flow channel 34a and the second liquid supply flow channel 34b.

[0269] The flow area of the first guide flow channel 371 can be smaller than the flow area of the second guide flow channel 372. For example, the flow area of the third sub-guide flow channel 3711 is smaller than the flow area of the first sub-guide flow channel 3721, and the flow area of the fourth sub-guide flow channel 3712 is smaller than the flow area of the second sub-guide flow channel 3722.

[0270] By limiting the flow areas of the first guide flow channel 371 and the second guide flow channel 372, the flow rate of the cooling medium in the first liquid supply flow channel 34a and the cooling medium flowing out from the liquid supply port 342 of the first liquid supply flow channel 34a can be made larger, which is beneficial to uniform heat dissipation in the axial direction Z.

[0271] See Figure 2 As shown, in some embodiments, the electric motor 21 further includes a radiator 40. For example, the radiator 40 can be a heat exchanger. The radiator 40 is arranged on the side of the power motor 30 away from the propeller 22. The liquid cooling cavity 310a is communicated with the inlet of the radiator 40, and the outlet of the radiator 40 is communicated with the inlet of the liquid inlet flow channel 35 of the power motor 30. With such an arrangement, the radiator 40 can dissipate heat from the cooling medium output from the liquid outlet 315, so that when the cooling medium flows back into the liquid cooling cavity 310a through the liquid inlet flow channel 35 and the liquid supply flow channel 34, it can continue to take away the heat of the coil winding 331 and dissipate heat from the coil winding 331, improving the utilization rate of the cooling medium.

[0272] See Figure 2 As shown, in some embodiments, the electric motor 21 further includes a fan 50. For example, the fan 50 is arranged on the side of the power motor 30 away from the propeller 22. For example, as shown in Figure 2 the fan 50 can be located on the side of the radiator 40 facing the power motor 30. The fan 50 is used to perform air-cooling heat dissipation on the radiator 40.

[0273] Figure 25 and Figure 26 show the structural schematic diagrams of the liquid pump 60 from different perspectives.

[0274] See Figure 25 and Figure 26 As shown, in some embodiments, the electric motor 21 may further include a liquid pump 60. The liquid pump 60 can be arranged on the power motor 30.

[0275] SeeFigure 26 As shown, the liquid pump 60 is provided with a medium inlet 61 and a medium outlet 62. The medium inlet 61 of the liquid pump 60 communicates with the outlet of the radiator 40, so that the liquid outlet 315 of the power motor 30 is communicated with the medium inlet 61 of the liquid pump 60 through the radiator 40. The medium outlet 62 of the liquid pump 60 communicates with the inlet of the liquid inlet passage 35 of the power motor 30, so that the cooling medium output from the liquid outlet 315 can flow back into the liquid inlet passage 35 again under the action of the liquid pump 60 after being cooled by the radiator 40, realizing the circulating flow of the cooling medium to further improve the utilization rate of the cooling medium.

[0276] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power motor, characterized in that: Including stator; The stator comprises a support assembly (31), a stator core assembly (32) and a stator winding assembly (33) wound on the stator core assembly (32); the support assembly (31) has a liquid cooling cavity (310a); the stator core assembly (32) and the stator winding assembly (33) are arranged in the liquid cooling cavity (310a); The cavity wall of the liquid cooling cavity (310a) has a liquid outlet (315) and at least two liquid supply ports (342); In the axial direction of the stator core assembly (32), at least two of the liquid supply ports (342) are arranged at intervals; The liquid supply port (342) is used for allowing the cooling medium to flow into the liquid cooling cavity (310a), and the liquid outlet (315) is used for allowing the cooling medium in the liquid cooling cavity (310a) to flow out; The cooling medium in the liquid cooling chamber (310a) is in direct contact with the stator core assembly (32) and the stator winding assembly (33); The support assembly (31) has a liquid inlet channel (35) and at least two liquid supply channels (34); In the axial direction of the stator core assembly (32), at least two of the liquid supply channels (34) are distributed in sequence, the channel wall of the liquid supply channel (34) has the liquid supply port (342), the liquid supply channel (34) is connected to the liquid cooling chamber (310a) through the liquid supply port (342), and the inlet of the liquid supply channel (34) is connected to the outlet of the liquid inlet channel (35); The support assembly (31) also has a bypass flow channel (36); At least one of the liquid supply channels (34) comprises at least two liquid supply sections (341) distributed along the circumference of the stator core assembly (32); the channel wall of the liquid supply section (341) has the liquid supply port (342); and the liquid supply section (341) is connected to the liquid cooling cavity (310a) through the liquid supply port (342); In the same liquid supply channel (34), the inlet of one of the at least two liquid supply sections (341) is connected to the outlet of the liquid inlet channel (35), the inlet of the other of the at least two liquid supply sections (341) is connected to the bypass channel (36), and the inlet of the bypass channel (36) is connected to the liquid inlet channel (35).

2. The power motor according to claim 1, characterized in that: The at least two liquid supply ports (342) include a first liquid supply port (3421); The stator core assembly (32) comprises a first end (32a) and a second end (32b), wherein the first end (32a) and the second end (32b) are respectively located at two ends of the axial direction of the stator core assembly (32); In the axial direction of the stator core assembly (32), the first liquid supply port (3421) is located between the first end (32a) and the second end (32b).

3. The power motor according to claim 2, characterized in that: A communication channel (38) is provided in the liquid cooling chamber (310a), and the first liquid supply port (3421) is in communication with the communication channel (38); In the axial direction of the stator core assembly (32), a first spacing space (310b) is provided between the first end (32a) and the cavity wall of the liquid cooling cavity (310a); The liquid outlet (315) is in communication with the first partition space (310b), and the first partition space (310b) is in communication with the communication channel (38).

4. The power motor according to claim 3, characterized in that: The stator core assembly (32) includes a first surface; The first surface has a first groove (32c), and the first groove (32c) and the cavity wall of the liquid cooling cavity (310a) provided with the first liquid supply port (3421) are surrounded to form the connecting flow channel (38), and the first groove (32c) passes through the first end (32a), so that the groove cavity of the first groove (32c) is connected with the first spacing space (310b).

5. The power motor according to claim 3, characterized in that: The liquid cooling cavity (310a) has a second groove (3111) on the cavity wall provided with the first liquid supply port (3421), the second groove (3111) and the stator core assembly (32) are arranged to form the communicating flow channel (38), and the first liquid supply port (3421) is located on the groove wall of the second groove (3111); In the axial direction of the stator core assembly (32), the first end (32a) is located between the two ends of the second groove (3111), so that the groove cavity of the second groove (3111) is connected to the first spacing space (310b).

6. The power motor according to claim 3, characterized in that: The stator core assembly (32) has a communication hole, and the communication hole forms the communication flow channel (38); The stator core assembly (32) comprises a core fixing ring; The core fixing ring comprises a first surface and a second surface, wherein the first surface and the second surface are respectively located on both sides of the core fixing ring in a radial direction, the connecting hole passes through the first surface and the second surface, the connecting hole is located at one end of the first surface and is connected to the first liquid supply port (3421), a second spacing space (310c) is provided between the second surface and the cavity wall of the liquid cooling cavity (310a), the connecting hole is located at one end of the second surface and is connected to the second spacing space (310c), and the second spacing space (310c) is connected to the liquid outlet (315).

7. The power motor according to any one of claims 1 to 6, characterized in that: The at least two liquid supply ports (342) include a second liquid supply port (3422); In the axial direction of the stator core assembly (32), the second liquid supply port (3422) is located on a side of the second end (32b) of the stator core assembly (32) away from the first end (32a) of the stator core assembly (32).

8. The power motor according to any one of claims 1 to 6, characterized in that: The at least two liquid supply ports (342) include a second liquid supply port (3422); A spray structure (39) is provided on the cavity wall of the liquid cooling cavity (310a); in the axial direction of the stator core assembly (32), the spray structure (39) is close to the second end (32b) of the stator core assembly (32); The second liquid supply port (3422) is in communication with the spray structure (39), the spray port of the spray structure (39) is in communication with the liquid cooling chamber (310a), and the spray port of the spray structure (39) is used for spraying in the direction of the stator core assembly (32).

9. The power motor according to any one of claims 1 to 6, characterized in that: The at least two liquid supply ports (342) include a first liquid supply port (3421) and a second liquid supply port (3422); In the axial direction of the stator core assembly (32), the first liquid supply port (3421) and the second liquid supply port (3422) are arranged at intervals, and the liquid outlet (315) is located on a side of the first liquid supply port (3421) away from the second liquid supply port (3422); the flow area of ​​the first liquid supply port (3421) is smaller than the flow area of ​​the second liquid supply port (3422).

10. The power motor according to any one of claims 1 to 6, characterized in that: The at least two liquid supply channels (34) include a first liquid supply channel (34a) and a second liquid supply channel (34b); In the axial direction of the stator core assembly (32), the outlet of the liquid inlet channel (35) is located between the inlet of the first liquid supply channel (34a) and the inlet of the second liquid supply channel (34b); The support assembly (31) further comprises a first flow guiding channel (371) and a second flow guiding channel (372); The outlet of the liquid inlet channel (35) is connected to the inlet of the first liquid supply channel (34a) through the first flow guide channel (371), and the outlet of the liquid inlet channel (35) is connected to the inlet of the second liquid supply channel (34b) through the second flow guide channel (372); the flow area of ​​the first flow guide channel (371) is smaller than the flow area of ​​the second flow guide channel (372).

11. The power motor according to any one of claims 1 to 6, characterized in that: The support assembly (31) comprises a stator support (311), a first stop cover (312), a second stop cover (313) and a sleeve (314); The stator core assembly (32) is sleeved on the radial outer side of the stator bracket (311), and the sleeve (314) is sleeved on the radial outer side of the stator core assembly (32); The first stop cover (312) is covered on one end of the sleeve (314) and the stator support (311), and the first stop cover (312) is sealedly connected to the sleeve (314) and the stator support (311); The second blocking cover (313) is covered on the other end of the sleeve (314) and the stator bracket (311), and the second blocking cover (313) is sealedly connected to the sleeve (314) and the stator bracket (311); The stator support (311), the sleeve (314), the first blocking cover (312) and the second blocking cover (313) are used to enclose and form the liquid cooling chamber (310a); the liquid supply port (342) is provided on the stator support (311); and the liquid outlet (315) is provided on the first blocking cover (312) or the second blocking cover (313).

12. An electric motor, characterized in that: It comprises a radiator (40) and a power motor as claimed in any one of claims 1 to 11; The liquid outlet (315) of the power motor is in communication with the inlet of the radiator (40), and the liquid supply port (342) of the power motor is in communication with the outlet of the radiator (40).

13. An electric propulsion device, characterized in that: comprising a propeller (22) and an electric motor as claimed in claim 12; The electric motor is drivingly connected to the propeller (22).

14. An aircraft, characterized in that: comprising a fuselage (11), wings (12), a tail wing (13) and an electric propulsion device as claimed in claim 13; The electric propulsion device is arranged on the wing (12), and / or the fuselage (11), and / or the tail wing (13).

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