Power motor, electric engine, electric propulsion device and aircraft

Abstract

The utility model provides a power motor, an electric engine, an electric propulsion device and an aircraft, and relates to the technical field of aircrafts. A stator core assembly and a stator winding assembly of the power motor are arranged in the liquid cooling cavity of the support assembly. The support assembly is provided with a liquid supply flow channel and a liquid inlet flow channel. An inlet of the liquid supply flow channel is communicated with an outlet of the liquid inlet flow channel, the liquid supply flow channel extends in the circumferential direction of the outer side of the stator iron core assembly, the flow channel wall of the liquid supply flow channel is provided with a plurality of liquid supply ports distributed at intervals in the extending direction of the liquid supply flow channel, and the liquid supply flow channel is communicated with the liquid cooling cavity through the liquid supply ports. And the through-flow area of the liquid supply port close to the inlet of the liquid supply flow channel is smaller than that of the liquid supply port far away from the inlet of the liquid supply flow channel. In this way, the flow difference of cooling media output by the liquid supply port at the far end of the liquid supply flow channel and the liquid supply port close to one side of the inlet of the liquid supply flow channel can be reduced, cooling (temperature) of all parts in the circumferential direction of the stator winding assembly can be uniform, and all the parts of the stator winding assembly can be fully cooled.

Description

TECHNICAL FIELD

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

[0002] An electric vertical take-off and landing (eVTOL) aircraft includes an electric propulsion device, the electric propulsion device includes a propeller and an electric engine, the electric engine includes a power motor, the power motor is in transmission connection with the propeller and is used to drive the propeller to rotate. During the operation of the power motor, the heat generated by the power motor is continuously accumulated with the increase of the working time, so that the temperature inside the power motor gradually rises, thereby reducing the working performance of the power motor. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to provide a power motor, an electric engine, an electric propulsion device and an aircraft, which can improve the uniformity of the cooling medium in cooling the stator winding assembly in the power motor, so as to improve the working performance of the power motor.

[0004] The first aspect of the embodiment of the present application provides a power motor. The power motor includes a stator;

[0005] The stator includes a support assembly, a stator core assembly and a stator winding assembly wound on the stator core assembly, the support assembly has a liquid cooling cavity, and the stator core assembly and the stator winding assembly are arranged in the liquid cooling cavity;

[0006] The support assembly further has a liquid supply flow channel and a liquid inlet flow channel;

[0007] The inlet of the liquid supply flow channel is in communication with the outlet of the liquid inlet flow channel, the liquid supply flow channel extends along the outer side of the stator core assembly in a circumferential direction, the flow channel wall of the liquid supply flow channel has a plurality of liquid supply ports distributed at intervals along the extension direction of the liquid supply flow channel, and the liquid supply flow channel is in communication with the liquid cooling cavity through the liquid supply ports;

[0008] The flow area of the liquid supply port close to the inlet of the liquid supply flow channel is smaller than the flow area of the liquid supply port away from the inlet of the liquid supply flow channel.

[0009] The electric motor provided by the embodiments of the present application can make the pressure drop of the cooling medium output by the liquid supply port at the far end of the liquid supply channel smaller by setting the flow area of the liquid supply port close to the inlet of the liquid supply channel smaller than the flow area of the liquid supply port far from the inlet of the liquid supply channel, so as to reduce the flow difference of the cooling medium output by the liquid supply port at the far end of the liquid supply channel and the liquid supply port close to the inlet of the liquid supply channel. This is conducive to improving the uniformity of the cooling medium output by the liquid supply port on the liquid supply channel, so that the cooling medium can coat the stator winding assembly after flowing into the liquid cooling cavity, and the stator winding assembly is immersed in the cooling medium, so that the cooling medium can directly contact the inside and outside of the coil winding, flow through the surface of the coil winding comprehensively and uniformly, and the cooling (temperature) of each part of the stator winding assembly is more uniform, so as to fully dissipate heat of each part of the stator winding assembly, thereby improving the heat dissipation effect of the stator winding assembly and the working performance of the electric motor. At the same time, since the stator winding assembly is immersed in the cooling medium, the utilization rate of the cooling medium can also be improved

[0010] In some possible implementation manners, in the extension direction of the liquid supply channel, the inlet of the liquid supply channel is located at the middle position of the liquid supply channel, and the flow channel wall of the liquid supply channel on both sides of the inlet of the liquid supply channel is provided with the liquid supply port.

[0011] In some possible implementation manners, in the radial direction of the stator core assembly, the liquid inlet channel is located on the side of the liquid supply channel away from the liquid cooling cavity.

[0012] The opening direction of the outlet of the liquid inlet channel is along the radial direction of the stator core assembly and towards the liquid cooling cavity.

[0013] In some possible implementation manners, the liquid supply channel comprises at least two liquid supply sections distributed along the circumferential direction of the stator core assembly, the liquid supply section extends along the outer side of the stator core assembly in the circumferential direction, the flow channel wall of the liquid supply section is provided with a plurality of liquid supply ports distributed at intervals in the extension direction of the liquid supply section, and the liquid supply section is in communication with the liquid cooling cavity through the liquid supply port.

[0014] In the same liquid supply section, the flow area of the liquid supply port close to the inlet of the liquid supply section is smaller than the flow area of the liquid supply port far from the inlet of the liquid supply section.

[0015] The bracket assembly further comprises a bypass flow channel, the inlet of one of the at least two liquid supply sections is in communication with the outlet of the liquid inlet channel, the inlets of the remaining liquid supply sections of the at least two liquid supply sections are in communication with the bypass flow channel, and the inlet of the bypass flow channel is in communication with the liquid inlet channel.

[0016] In some possible implementation manners, in the extension direction of the liquid supply channel, the at least two adjacent liquid supply sections are arranged separately.

[0017] In some possible implementation manners, the bracket assembly further has a first sub-guide flow channel, the first sub-guide flow channel extending along the axial direction of the stator core assembly;

[0018] For the liquid supply section in communication with the inlet of the bypass flow channel: the outlet of the liquid inlet flow channel is in communication with the inlet of the first sub-guide flow channel, and the outlet of the first sub-guide flow channel is in communication with the inlet of the liquid supply section.

[0019] In some possible implementation manners, the bypass flow channel extends along the outer side of the stator core assembly in the circumferential direction, and the bypass flow channel and the liquid supply flow channel are arranged in sequence along the axial direction of the stator core assembly.

[0020] In some possible implementation manners, the outlet of the bypass flow channel and the inlet of the bypass flow channel are located at two ends of the extension direction of the bypass flow channel, respectively;

[0021] In the liquid supply section in communication with the bypass flow channel, the liquid supply section includes a first sub-section and a second sub-section distributed along the circumferential direction of the stator core assembly;

[0022] The bracket assembly further has a second sub-guide flow channel, the outlet of the bypass flow channel is in communication with one end of the first sub-section close to the second sub-section and one end of the second sub-section close to the first sub-section through the second sub-guide flow channel, and the second sub-guide flow channel is used for making the flow of the cooling medium flowing into the first sub-section and the flow of the cooling medium flowing into the second sub-section uniform.

[0023] In some possible implementation manners, the flow direction of the cooling medium in the first sub-section is opposite to the flow direction of the cooling medium in the bypass flow channel, and the flow direction of the cooling medium in the second sub-section is the same as the flow direction of the cooling medium in the bypass flow channel;

[0024] The second sub-guide flow channel includes a first sub-guide section and a second sub-guide section;

[0025] The first sub-section is in communication with the bypass flow channel through the first sub-guide section, and the second sub-section is in communication with the bypass flow channel through the second sub-guide section, and the flow area of the first sub-guide section is greater than the flow area of the second sub-guide section.

[0026] In some possible implementation manners, the liquid inlet flow channel includes a first port and a second port;

[0027] For the liquid supply section in communication with the inlet of the bypass flow channel: the first port is in communication with the inlet of the liquid supply section;

[0028] The second port is in communication with the inlet of the bypass flow channel;

[0029] The flow area of the first port is smaller than the flow area of the second port;

[0030] The throughflow area of the liquid supply section in communication with the outlet of the inlet flow channel is greater than or equal to the throughflow area of the first port, and / or the throughflow area of the bypass flow channel and the liquid supply section in communication with the bypass flow channel is greater than or equal to the throughflow area of the second port.

[0031] In some possible implementation manners, the at least two liquid supply sections include a first liquid supply section and a second liquid supply section.

[0032] The inlet of the first liquid supply section is in communication with the outlet of the inlet flow channel, and the inlet of the second liquid supply section is in communication with the bypass flow channel.

[0033] The first liquid supply section and the second liquid supply section are arranged opposite in the radial direction of the stator core assembly, and / or the inlets of the first liquid supply section and the second liquid supply section are arranged opposite in the radial direction of the stator core assembly.

[0034] In some possible implementation manners, the bracket assembly includes a stator bracket, a first cover, a second cover, and a sleeve.

[0035] The stator core assembly is sleeved on the outer side of the stator bracket in the radial direction.

[0036] The sleeve is sleeved on the outer side of the stator core assembly in the radial direction.

[0037] The first cover is connected to one end of the sleeve and the stator bracket, and the first cover is in sealed connection with the sleeve and the stator bracket.

[0038] The second cover is connected to the other end of the sleeve and the stator bracket, and the second cover is in sealed connection with the sleeve and the stator bracket.

[0039] The stator bracket, the sleeve, the first cover, and the second cover are used to form a liquid cooling cavity, and the inlet flow channel and the inlet flow channel are located on the stator bracket.

[0040] The second aspect of the embodiment of the present application provides an electric motor. The electric motor includes a radiator and the power motor according to any one of the above.

[0041] The liquid cooling cavity of the power motor is in communication with the inlet of the radiator, and the outlet of the radiator is in communication with the inlet of the inlet flow channel of the power motor.

[0042] The third aspect of the embodiment of the present application provides an electric propulsion device. The electric propulsion device includes a propeller and the electric motor according to the above.

[0043] The electric motor is in driving connection with the propeller.

[0044] The fourth aspect of the embodiment of the present application provides an aircraft. The aircraft includes a fuselage, a wing, a tail, and the electric propulsion device according to the above.

[0045] The electric propulsion device is arranged on the wing, and / or the fuselage, and / or the tail. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0047] Figure 1 A schematic structural diagram of an aircraft provided in an embodiment of the present application;

[0048] Figure 2 A schematic structural diagram of an electric engine provided in an embodiment of the present application;

[0049] Figure 3 A schematic structural diagram of a power motor provided in an embodiment of the present application from a first perspective;

[0050] Figure 4 An exploded view of a power motor provided in an embodiment of the present application;

[0051] Figure 5 A partial schematic diagram of a stator winding assembly provided in an embodiment of the present application;

[0052] Figure 6 An internal schematic diagram of a power motor provided in an embodiment of the present application;

[0053] Figure 7 for Figure 6 A partial schematic diagram of the medium power motor;

[0054] Figure 8 A partial internal diagram of a power motor provided in an embodiment of the present application Figure 1 ;

[0055] Figure 9 A partial internal diagram of a power motor provided in an embodiment of the present application Figure 2 ;

[0056] Figure 10 A structural diagram of the power motor provided in an embodiment of the present application from a second viewing angle;

[0057] Figure 11 for Figure 10 Partial diagram of a medium-power motor Figure 1 ;

[0058] Figure 12 for Figure 11 Schematic diagram of the structure of a medium-power motor without the stator winding assembly;

[0059] Figure 13 An internal view of a stator support according to an embodiment of the present application is provided;

[0060] Figure 14 An internal partial view of a stator support according to an embodiment of the present application is provided;

[0061] Figure 15 A partial view of a support assembly according to an embodiment of the present application is provided;

[0062] Figure 16 A partial view of a power motor according to an embodiment of the present application is provided Figure 2 ;

[0063] Figure 17 A structural view of a stator support according to an embodiment of the present application is provided;

[0064] Figure 18 A partial structural view of a stator support according to an embodiment of the present application is provided Figure 1 ;

[0065] Figure 19 A partial structural view of a stator support according to an embodiment of the present application is provided Figure 2 ;

[0066] Figure 20 A partial view of a stator support according to an embodiment of the present application at a liquid inlet channel side is provided;

[0067] Figure 21 A structural view of a stator support according to an embodiment of the present application at a bypass channel outlet position is provided;

[0068] Figure 22 A structural view of a stator according to an embodiment of the present application at a communication channel is provided;

[0069] Figure 23 A structural view of another stator according to an embodiment of the present application at a communication channel is provided;

[0070] Figure 24 A structural view of a spraying structure inside a power motor according to an embodiment of the present application is provided;

[0071] Figure 25 A structural view of a liquid pump according to an embodiment of the present application at a first perspective is provided;

[0072] Figure 26 A structural view of a liquid pump according to an embodiment of the present application at a second perspective is provided.

[0073] Reference signs:

[0074] 11, fuselage; 12, wing; 13, tail; 14, arm; 15, nacelle;

[0075] 20, electric propulsion device; 20a, fixed electric propulsion device; 20b, tilting electric propulsion device; 21, electric motor; 22, propeller;

[0076] 30, power motor;

[0077] 31, bracket assembly; 310a, liquid cooling cavity; 310b, first spacing space; 310c, second spacing space; 311, stator bracket; 3111, second groove; 312, first cover; 313, second cover; 314, sleeve; 315, liquid outlet;

[0078] 32, stator core assembly; 32a, first end; 32b, second end; 32c, first groove; 321, stator core; 3211, protrusion; 322, core fixing ring; 3221, groove;

[0079] 33, stator winding assembly; 331, coil winding; 332, insulating paper;

[0080] 34, liquid supply channel; 34a, first liquid supply channel; 34b, second liquid supply 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;

[0081] 35, liquid inlet channel; 351, first port; 352, second port;

[0082] 36, bypass channel;

[0083] 37, flow guide channel; 371, first flow guide channel; 3711, third sub-flow guide channel; 3712, fourth sub-flow guide channel; 3713, third sub-flow guide section; 3714, fourth sub-flow guide section; 372, second flow guide channel; 3721, first sub-flow guide channel; 3722, second sub-flow guide channel; 3723, first sub-flow guide section; 3724, second sub-flow guide section; 373, liquid distribution channel;

[0084] 38, communication channel;

[0085] 39, spraying structure;

[0086] 40, radiator;

[0087] 50, fan;

[0088] 60, liquid pump; 61, medium inlet; 62, medium outlet. DETAILED DESCRIPTION

[0089] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort should fall within the protection scope of the present application.

[0090] It should be noted that the terms "first", "second" are used only for descriptive purpose, and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0091] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integrated; can be directly connected, or indirectly connected through an intermediate medium; can be the connection or interaction relationship between two elements, unless otherwise explicitly limited. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0092] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be 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 "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0093] In the above description, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like 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 the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0094] Figure 1 A structural schematic diagram of an aircraft is shown. Referring to Figure 1 The embodiments of the present application provide an aircraft. For example, the aircraft can be an electric vertical take-off and landing (eVTOL) aircraft as shown in Figure 1 However, it should be noted that Figure 1 is only a structural schematic of an aircraft and does not constitute a limitation on the structure of the aircraft.

[0095] In the following Figure 1 , the structure of the aircraft is described.

[0096] Referring to Figure 1 , the aircraft includes a fuselage 11 and wings 12. The fuselage 11 is a symmetrical structure, and the remaining structure and shape of the fuselage 11 are not limited, and can refer to the fuselage structure of the existing aircraft. The wings 12 are fixedly connected to the fuselage 11 and extend along both sides of the fuselage 11, and the wings 12 on both sides are symmetrically arranged relative to the symmetry plane of the fuselage 11. The structure of the wings 12 can also refer to the fixed wing structure of the existing aircraft, and will not be described here.

[0097] It should be noted that in some embodiments, in addition to the fuselage 11 and the wings 12, the aircraft can also include a tail 13. The tail 13 is fixedly arranged at the tail of the fuselage 11, and the tail 13 is integrally formed or mechanically connected with the fuselage 11 and symmetrically arranged relative to the symmetry plane of the fuselage 11. The structure of the tail 13 can also refer to the tail structure of the existing aircraft, and will not be described here.

[0098] Referring to Figure 1 , the aircraft further includes an electric propulsion device 20. The electric propulsion device 20 is a device for providing power to the aircraft. The number of electric propulsion devices 20 is one or more, for example Figure 1As shown, the aircraft includes eight electric propulsion devices 20. The electric propulsion devices 20 are provided on the wings 12, and / or the fuselage 11, and / or the tail 13, that is, the electric propulsion devices 20 can be provided on at least one of the wings 12, the fuselage 11 and the tail 13.

[0099] For example, Figure 1 As shown, electric propulsion devices 20 are symmetrically provided on the wings 12 and the tail 13. Of course, in some scenarios, the electric propulsion devices 20 are provided on the fuselage 11, while the wings 12 and tail 13 are not provided with electric propulsion devices 20. In other scenarios, the electric propulsion devices 20 are provided on the wings 12, while the fuselage 11 and tail 13 are not provided with electric propulsion devices 20. Alternatively, in other embodiments, the electric propulsion devices 20 are provided on the tail 13, while the fuselage 11 and wings 12 are not provided with electric propulsion devices 20.

[0100] Continue to see Figure 1 As shown, the aircraft further includes an arm 14 and a nacelle 15, both of which are used to connect to an electric propulsion device 20, so as to set the electric propulsion device 20 on the fuselage 11, the wing 12, or the tail 13. Of course, in some scenarios, the aircraft may also include either the arm 14 or the nacelle 15.

[0101] In some embodiments, as Figure 1 As shown, the electric propulsion device 20 is disposed on the wing 12 via the arm 14. In other embodiments, the electric propulsion device 20 may also be disposed on the wing 12 via a nacelle 15 (not shown in the figure).

[0102] In some embodiments, as Figure 1 As shown, the electric propulsion device 20 is disposed on the tail 13 via the nacelle 15. In other embodiments, the electric propulsion device 20 may also be disposed on the tail 13 via the machine arm 14 (not shown in the figure).

[0103] In some examples, the electric propulsion device 20 provided on the aircraft may include a fixed electric propulsion device 20 a , which is fixedly connected to any one of the fuselage 11 , the wings 12 , and the tail 13 .

[0104] In some examples, the electric propulsion device 20 provided on the aircraft may include a tilting electric propulsion device 20b, and a tilting mechanism is provided between the tilting electric propulsion device 20b and any one of the fuselage 11, wings 12 and tail 13, and the tilting mechanism is used to adjust the tilt angle of the tilting electric propulsion device 20b.

[0105] In some examples, all electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20 a.

[0106] In some examples, all the electric propulsion devices 20 arranged on the aircraft are fixed electric propulsion devices 20a.

[0107] In some examples, part of the electric propulsion devices 20 arranged on the aircraft are fixed electric propulsion devices 20a, and part of the electric propulsion devices 20 are tilting electric propulsion devices 20b, for example Figure 1 as shown, four of the electric propulsion devices 20 are fixed electric propulsion devices 20a, and the remaining four electric propulsion devices 20 are tilting electric propulsion devices 20b, and the fixed electric propulsion devices 20a are arranged outside the tilting electric propulsion devices 20b.

[0108] 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. The electric motor 21 includes a power motor 30, a motor controller (not shown in the figure), and a cable, etc., and can convert electric energy into mechanical energy. In actual implementation, the electric motor 21 can also be referred to as an electric propulsion system.

[0109] As shown in Figure 1 , 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, and the electric motor 21 is used to drive the propeller 22 to rotate to provide power for the aircraft.

[0110] 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.

[0111] Figure 1 A structural schematic diagram of an electric motor 21 is shown.

[0112] As shown in Figure 2 , the electric motor 21 includes a power motor 30, and 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.

[0113] 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, and the power motor 30 is used to drive the propeller 22 to rotate.

[0114] Figure 2 A structural schematic diagram of a power motor 30 in a first perspective view is shown, Figure 3 an exploded view of a power motor 30 is shown.

[0115] As shown in Figure 4 and Figure 3 , the power motor 30 includes a stator. The stator includes a bracket assembly 31 (not shown in the figure). The bracket assembly 31 can also be referred to as a shell of the power motor 30.

[0116] The stator further comprises a core winding assembly. The core winding assembly is arranged in the bracket assembly 31. The core winding assembly comprises a stator core assembly 32 and a stator winding assembly 33 arranged on the stator core assembly 32. The stator core assembly 32 comprises a plurality of stator cores 321 arranged in the bracket assembly 31 along the circumferential direction W of the bracket assembly 31. The stator winding assembly 33 comprises a plurality of coil windings 331. The coil windings 331 can be coated with insulating paint. When the stator winding assembly 33 is arranged on the stator core assembly 32, the coil windings 331 are arranged on each stator core 321.

[0117] The power motor 30 further comprises a rotor (not shown in the figure). The rotor is rotationally connected with the bracket assembly 31, and the core winding assembly is used to drive the rotor to rotate. Specifically, when the coil windings 331 are electrified, the magnetic field generated by the stator cores 321 can drive the rotor to rotate. The rotor is drivingly connected with the propeller 22, so that the rotor can drive the propeller 22 to rotate when the rotor rotates, so as to provide power for the aircraft.

[0118] The power motor 30 is a high-power heat-generating moving device. In the process of developing high-torque density and high-power density power motors 30, the cooling problem has always been an important factor restricting the research and development of the power motor 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 of the power motor 30 during operation is of great significance to the research of high-performance power motors 30.

[0119] At present, the heat generated by the power motor in the aircraft during operation continuously accumulates as the working time increases, 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 take-off and landing aircraft, in order to improve the working performance of the power motor, it is necessary to improve the heat dissipation performance of the power motor during operation, and the cooling of the power motor has always been an important research direction in the field of power motors.

[0120] In related fields, for high-power heat-generating moving devices such as drive motors of new energy vehicles, the drive motor is usually provided with a heat dissipation flow channel, and a cooling medium passing through the heat dissipation flow channel indirectly exchanges heat with the stator shell and the stator winding of the stator, so that the temperature of the drive motor is within a reasonable range.

[0121] However, in order to meet the requirements of weight and arrangement space, the components designed for electric vertical take-off and landing aircrafts usually need to be small and precise, and the performance needs to be ensured. If the heat dissipation flow channel in the related field is used to dissipate heat from the power motor, the size of the electric motor will be large, and the heat dissipation demand of the power motor cannot be met.

[0122] The present embodiment provides a power motor 30. An iron core winding assembly is disposed within a liquid cooling chamber 310a of a support assembly 31. The support assembly 31 includes at least a liquid supply channel 34 and a liquid inlet channel 35. The liquid supply channel 34 connects the liquid supply channel 34 and the liquid cooling chamber 310a, allowing the cooling medium within the liquid supply channel 34 to enter the liquid cooling chamber 310a via the liquid supply channel 34, dissipating heat from the coil winding 331. This also allows the stator winding assembly 33 in the iron core winding assembly to be cooled more evenly at various locations along the circumference, thereby improving the operating performance of the power motor 30.

[0123] It should be noted that the cooling medium can be a liquid medium such as cooling oil, cooling water, etc.

[0124] The following uses cooling oil as an example of a cooling medium, and combines the drawings and embodiments to further illustrate the structure of the power motor 30 provided in the embodiment of the present application.

[0125] See also Figure 4 and Figure 3 As shown, as described above, the power motor 30 includes a bracket assembly 31 and an iron core winding assembly. Figure 4 2 shows the structure of the stator core assembly 32 and the stator winding assembly 33 in the core winding assembly. The arrangement of the stator winding assembly 33 on the stator core assembly 32 can refer to the relevant description above, and will not be further described here.

[0126] Figure 4 A partial schematic diagram of a stator winding assembly 33 is shown.

[0127] See also Figure 5 As shown, in addition to the coil winding 331 , the stator winding assembly 33 further includes insulating paper 332 . The insulating paper 332 is provided on the side of the same coil winding 331 facing the stator core 321 on which the coil winding 331 is wound.

[0128] Figure 5 The internal schematic diagram of a power motor 30 is shown. Figure 6 for Figure 7 A partial schematic diagram of the medium power motor 30.

[0129] See also Figure 6 and Figure 6 As shown, the core winding assembly is arranged in the bracket assembly 31. Specifically, as Figure 7 As shown in FIG, the support assembly 31 has a liquid cooling cavity 310 a. The stator core assembly 32 and the stator winding assembly 33 are disposed within the liquid cooling cavity 310 a to facilitate installation of the core winding assembly within the support assembly 31. For example, the liquid cooling cavity 310 a may be an annular cavity so that all portions of the stator core assembly 32 in the circumferential direction W can be disposed within the liquid cooling cavity 310 a.

[0130] Since the stator winding assembly 33 is disposed in the liquid cooling cavity 310 a , when the cooling medium flows into the liquid cooling cavity 310 a , it can take away the heat of the coil winding 331 in the stator winding assembly 33 , thereby achieving heat dissipation for the coil winding 331 .

[0131] Since the coil winding 331 serves as a heat source for the core winding assembly, when the cooling medium flows into the liquid cooling chamber 310 a and takes away the heat of the coil winding 331 , heat dissipation for the core winding assembly can be achieved.

[0132] Figure 7 Shows a partial internal schematic diagram of a power motor 30 Figure 8 , Figure 1 Shows a partial internal schematic diagram of a power motor 30 Figure 9 .

[0133] See also Figure 2 and Figure 8 As 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 sleeve 314 can be made of carbon fiber. The core winding assembly is sleeved on the outer side of the stator support 311 in the radial direction X, and the sleeve 314 is sleeved on the outer side of the 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 sealed 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 sealed to the sleeve 314 and the stator support 311.

[0134] The stator support 311 , the sleeve 314 , the first stopper 312 and the second stopper 313 are used to enclose and form a liquid cooling chamber 310 a to enable the core winding assembly to be installed in the support assembly 31 while ensuring the sealing of the liquid cooling chamber 310 a .

[0135] Figure 9 This is a structural diagram of the power motor 30 provided in an embodiment of the present application at a second viewing angle. Figure 10 Shown Figure 11 Partial schematic diagram of the medium power motor 30 Figure 10 The assembly effect of the stator core assembly 32 and the stator winding assembly 33 in the bracket assembly 31 can be seen in Figure 1 and Figure 10 shown.

[0136] Due to the arrangement of the first blocking cover 312 and the second blocking cover 313 , when disassembling the core winding assembly, it is only necessary to open the first blocking cover 312 or the second blocking cover 313 to realize the disassembly and assembly of the core winding assembly in the bracket assembly 31 , thereby simplifying the disassembly and assembly of the core winding assembly in the bracket assembly 31 .

[0137] In some embodiments, the first cover 312 can be connected to the sleeve 314 and the stator support 311 in a sealed manner, such as by a sealing ring, sealing glue, sealing glue combined with fasteners, or the like. For example, the fasteners can be rivets or the like. The sealing glue can be high-temperature-resistant high-strength epoxy structural glue. Similarly, the second cover 313 can also be connected to the sleeve 314 and the stator support 311 in a sealed manner, such as by a sealing ring, sealing glue, sealing glue combined with fasteners, or the like.

[0138] Figure 11 It is shown that Figure 12 A structural schematic diagram of the power motor 30 without the stator winding assembly 33.

[0139] Referring to Figure 11 As shown, in some embodiments, in addition to the stator core 321, the stator core 321 group also includes a core fixing ring 322. The 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 in the stator support 311 through the core fixing ring 322 to enhance the fixing effect of the core winding assembly in the liquid cooling cavity 310a.

[0140] For example, one of the stator core 321 and the core fixing ring 322 can be provided with a groove 3221, and the other can be provided with a protrusion 3211 matching (the same or similar) the structure of the groove 3221, which can be embedded in the groove 3221 to realize the clamping connection between the stator core 321 and the core fixing ring 322. Figure 12 In some embodiments, it is shown that the stator core 321 is provided with the protrusion 3211, and the core fixing ring 322 is provided with the groove 3221.

[0141] For example, in this structure, 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 clamped with the core fixing ring 322.

[0142] Referring to Figure 12 As shown, the core fixing ring 322 and the stator support 311 can also be connected by the cooperation of the protrusion 3211 and the groove 3221 mentioned above.

[0143] It should be understood that in some embodiments, the stator core 321 and the core fixing ring 322, and the core fixing ring 322 and the stator support 311 can also be connected by fasteners such as screws or bolts.

[0144] In some embodiments, the end of the stator core 321 away from the core fixing ring 322 can also be fixed with the sleeve 314.

[0145] Figure 11An internal schematic view of the stator support 311 is shown, Figure 13 An internal partial schematic view of the stator support 311 is shown, Figure 14 A partial schematic view of a support assembly 31 is provided for the embodiments of the present application.

[0146] Referring to Figure 15 As shown, in some embodiments, the support assembly 31 also has a liquid supply channel 34 and a liquid inlet channel 35. The inlet of the liquid supply channel 34 is in communication with the outlet of the liquid inlet channel 35.

[0147] The liquid supply channel 34 extends along the outer periphery of the stator core assembly 32. Here, the outer periphery 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.

[0148] Figure 13 to Figure 15 A partial schematic view of a power motor 30 is provided for the embodiments of the present application. Figure 16 , Figure 2 A structural schematic view of the stator support 311 is shown.

[0149] Referring to Figure 17 , Figure 14 and Figure 16 As shown, the flow channel wall of the liquid supply channel 34 has a plurality of liquid supply openings 342 distributed at intervals along the extension direction of the liquid supply channel 34. The liquid supply channel 34 is in communication with the liquid cooling cavity 310a through the liquid supply openings 342, so that the liquid inlet channel 35 can be in communication with the liquid cooling cavity 310a through the liquid supply channel 34. In this way, when the cooling medium enters the liquid supply channel 34 through the liquid inlet channel 35 and flows 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 openings 342 on the liquid supply channel 34. After the cooling medium enters the liquid cooling cavity 310a, it can wrap around the coil winding 331 in the stator winding assembly 33 and directly contact the coil winding 331, thereby taking away the heat of the coil winding 331 and achieving heat dissipation for the coil winding 331 and the stator winding assembly 33.

[0150] Referring to Figure 17 and in combination with Figure 17 As shown, the flow area of the liquid supply opening 342 close to the inlet of the liquid supply channel 34 is smaller than the flow area of the liquid supply opening 342 away from the inlet of the liquid supply channel 34.

[0151] It should be noted that the flow area of the liquid supply opening 342 mentioned in the present application can be understood as the area available for the cooling medium to pass through the liquid supply opening 342. The flow area can also be understood as the opening area of the liquid supply opening 342.

[0152] Due to the existence of the liquid supply port 342, part of the pressure of the cooling medium flowing in the liquid supply channel 34 will be released through the liquid supply port 342. The end of the liquid supply channel 34 away from the inlet is defined as the distal end. The longer the cooling medium flows in the liquid supply channel 34 towards the distal end of the liquid supply channel 34, the more pressure will be released, and the smaller the flow reaching the distal end of the liquid supply channel 34 will be. If the distal end of the liquid supply channel 34 has a liquid supply port 342, it will affect the output of the cooling medium at the distal end of the liquid supply channel 34, and thus affect the heat dissipation capacity of the cooling medium output at the distal end of the liquid supply channel 34.

[0153] In the present application, however, the flow area of the liquid supply port 342 near the inlet of the liquid supply channel 34 is smaller than the flow area of the liquid supply port 342 away from the inlet of the liquid supply channel 34, so that the pressure drop of the cooling medium output by the liquid supply port 342 at the distal end of the liquid supply channel 34 is smaller, thereby reducing the flow difference between the cooling medium output by the liquid supply port 342 at the distal end of the liquid supply channel 34 and the cooling medium output by the liquid supply port 342 near the inlet of the liquid supply channel 34.

[0154] In this way, the uniformity of the cooling medium output by the liquid supply port 342 on the liquid supply channel 34 is improved, so that after the cooling medium flows in the liquid supply channel 34 into 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 uniformly through the surface of the coil winding 331, and carry away the heat of the coil winding 331. The cooling (temperature) of each part of the stator winding assembly 33 in the circumferential direction W is more uniform, so that each part of the stator winding assembly 33 is fully cooled, the heat dissipation effect of the stator winding assembly 33 is improved, and the working performance of the dynamoelectric machine 30 is improved. At the same time, since the stator winding assembly 33 is immersed in the cooling medium, the utilization rate of the cooling medium is also improved.

[0155] In some examples, to ensure that the flow area of the liquid supply port 342 near the inlet of the liquid supply channel 34 is smaller than the flow area of the liquid supply port 342 away from the inlet of the liquid supply channel 34, the flow area of the liquid supply port 342 can gradually increase from the direction near the inlet of the liquid supply channel 34 to the direction away from the inlet of the liquid supply channel 34.

[0156] Alternatively, in other examples, when designing the liquid supply channel 34, only the flow area of the liquid supply port 342 near the inlet of the liquid supply channel 34 can be smaller than the flow area of the liquid supply port 342 away from the inlet of the liquid supply channel 34, without following the rule that the flow area of the liquid supply port 342 gradually increases.

[0157] Referring to Figure 15As shown, in some embodiments, the inlet of the liquid supply channel 34 can be located at a middle section of the liquid supply channel 34 in the extension direction of the liquid supply channel 34, where the middle section of the liquid supply channel 34 refers to a position close to the middle of the liquid supply channel 34 itself. The flow channel wall of the liquid supply channel 34 on both sides of the inlet of the liquid supply channel 34 is provided with a liquid supply port 342. For example, the flow channel wall on both sides of the inlet of the liquid supply channel 34 can be provided with a plurality of liquid supply ports 342. At this time, the liquid supply channel 34 has two distal ends.

[0158] By locating the inlet of the liquid supply channel 34 at a middle section of the liquid supply channel 34, the cooling medium can flow in the liquid supply channel 34 in two different directions to the liquid cooling cavity 310a, and the cooling medium has a small pressure difference between the distal end and the inlet of the liquid supply channel 34. This can make the flow rate of the cooling medium output by each liquid supply port 342 of the liquid supply channel 34 more uniform, and further improve the uniformity of heat dissipation of the cooling medium to the stator winding assembly 33.

[0159] Referring to 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 section 341 extends along the outer circumferential direction of the stator core assembly 32. The liquid supply section 341 is in communication with the liquid cooling cavity 310a.

[0160] Specifically, the flow channel wall of the liquid supply section 341 has a plurality of liquid supply ports 342 distributed at intervals along the extension direction of the liquid supply section 341. The liquid supply section 341 is in communication with the liquid cooling cavity 310a through the liquid supply port 342, so that the cooling medium can be output to the liquid cooling cavity 310a through the plurality of liquid supply ports 342 of the same liquid supply section 341 along the radial direction X of the stator core assembly 32, so as to quickly coat the coil winding 331 and dissipate heat of the stator winding assembly 33.

[0161] In some embodiments, in the same liquid supply section 341, the flow area of the liquid supply port 342 close to the inlet of the liquid supply section 341 is smaller than the flow area of the liquid supply port 342 away 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 area of the liquid supply port 342 close to the inlet of the liquid supply section 341 is smaller than the flow area of the liquid supply port 342 away from the inlet of the liquid supply section 341.

[0162] For example, in some examples, for the same liquid supply section 341, the flow area of the liquid supply port 342 can gradually increase from the direction close to the inlet of the liquid supply section 341 to the direction away from the inlet of the liquid supply section 341, so as to ensure that the flow area of the liquid supply port 342 close to the inlet of the liquid supply section 341 is smaller than the flow area of the liquid supply port 342 away from the inlet of the liquid supply section 341.

[0163] See also Figure 15 As shown, in addition to the liquid supply channel 34 and the liquid inlet channel 35, the bracket assembly 31 also has a bypass channel 36. The liquid supply channel 34, the liquid inlet channel 35, and the bypass channel 36 are located on the stator bracket 311, so that the liquid supply channel 34, the liquid inlet channel 35, and the bypass channel 36 are arranged on the bracket assembly 31. In this case, the liquid supply port 342 is also provided on the stator bracket 311.

[0164] 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 remaining liquid supply section 341 is connected to the bypass channel 36, and the inlet of the bypass channel 36 is connected to the liquid inlet channel 35, so that the inlet of the remaining liquid supply section 341 of the at least two liquid supply sections 341 is connected to the liquid inlet channel 35 through the bypass channel 36. In this way, the cooling medium can enter the bypass channel 36 through the outlet of the liquid inlet channel 35 and enter the liquid supply section 341 connected to the bypass channel 36 through the bypass channel 36.

[0165] 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 achieve the coating of the stator winding assembly 33 in the circumferential direction W, so that the heat dissipation (temperature) of each part of the stator winding assembly 33 in the circumferential direction W is more uniform.

[0166] Because the liquid inlet channel 35 is positioned near the edge of the bracket assembly 31 in 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 located farther from the outlet of the liquid inlet channel 35. If at least two liquid supply sections 341 are distributed along the circumferential direction W of the stator core assembly 32, and adjacent liquid supply sections 341 are interconnected, the distal end of the liquid supply channel 34 will be located farther from the outlet of the liquid inlet channel 35, which will still result in a lower flow rate of the cooling medium outputted from the distal end of the liquid supply channel 34.

[0167] In contrast, in the present application, the bypass channel 36 is provided. When the cooling medium is output through the bypass channel 36 and the liquid supply section 341 connected to the bypass channel 36 and enters the liquid cooling chamber 310a, the bypass channel 36 can supply liquid to the liquid supply section 341 located farther from the outlet of the liquid inlet channel 35. Furthermore, since the bypass channel 36 is not provided with a liquid supply port 342, the pressure difference when the cooling medium flows from the outlet of the liquid inlet channel 35 through the bypass 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 channel 34, and further improve the uniformity of the cooling medium's heat dissipation to the stator winding assembly 33.

[0168] Referring to Figure 15 As shown, in some embodiments, since the bypass flow channel 36 is capable of reducing the pressure difference when the cooling medium flows from the outlet of the inlet flow channel 35 to the inlet of the liquid supply section 341 via the bypass flow channel 36, the uniformity of the flow of the cooling medium output by each liquid supply port 342 of the liquid supply flow channel 34 is improved.

[0169] Therefore, in some embodiments, the liquid supply flow channel 34, the bypass flow channel 36 and the inlet flow channel 35 can also be arranged on the bracket assembly 31, and at least two liquid supply sections 341 are arranged in the liquid supply flow channel 34, so that the inlet of one of the at least two liquid supply sections 341 is in communication with the outlet of the inlet flow channel 35, and the inlets of the remaining liquid supply sections 341 of the at least two liquid supply sections 341 are in communication with the bypass flow channel 36.

[0170] At this time, the number of liquid supply ports 342 on the liquid supply section 341 can not be limited, and the uniformity of the 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 the liquid supply section 341 has a plurality of liquid supply ports 342, the arrangement and flow area of the plurality of liquid supply ports 342 can refer to the related description in the above.

[0171] The structure of the bracket assembly 31 and the power motor 30 will be further described below with the embodiment of the bracket assembly 31 having the inlet flow channel 35, the bypass flow channel 36 and the liquid supply flow channel 34 (including at least two liquid supply sections 341) at the same time as an example.

[0172] Figure 15 And Figure 18 Figures 8A and 8B show the structure of the stator bracket 311 in the liquid supply section 341 and the inlet flow channel 35 from different perspectives.

[0173] Referring to Figure 19 And Figure 18 As shown, in the extension direction of the liquid supply flow channel 34, at least two adjacent liquid supply sections 341 are arranged separately, so that the adjacent liquid supply sections 341 are not in communication in the extension direction of the liquid supply flow channel 34.

[0174] For example, the liquid supply flow channel 34 can be arranged to be disconnected between the adjacent liquid supply sections 341, so that there is a spacing between the adjacent liquid supply sections 341 in the extension direction of the liquid supply flow channel 34, thereby separating the adjacent liquid supply sections 341.

[0175] Alternatively, a blocking structure can be arranged in the liquid supply flow channel 34 between the adjacent liquid supply sections 341, and the blocking structure is pressed against the inner side of the flow channel wall of the liquid supply flow channel 34, thereby blocking the communication between the adjacent liquid supply sections 341 and separating the adjacent liquid supply sections 341.

[0176] When the adjacent liquid supply sections 341 are not communicated in the extension direction of the liquid supply channel 34, the cooling medium in the adjacent liquid supply sections 341 can not affect each other, so that the cooling medium can be uniformly output from the liquid supply ports 342 of the liquid supply sections 341 to the liquid cooling cavity 310a of the stator core assembly 32 in the radial direction X, and the cooling medium can uniformly cover and infiltrate the core winding assembly, so that the heat dissipation of each part of the core winding assembly is uniform. At the same time, when the adjacent liquid supply sections 341 are not communicated in the extension direction of the liquid supply channel 34, the flow control of the cooling medium output from the liquid supply ports 342 of the adjacent liquid supply sections 341 is easier.

[0177] 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 communicated with the outlet of the liquid inlet channel 35. The inlet of the second liquid supply section 341b is communicated with the bypass channel 36. That is, 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 medium can enter the first liquid supply section 341a and the second liquid supply section 341b through the outlet of the liquid inlet channel 35 respectively, and be output from the liquid supply ports 342 of the first liquid supply section 341a and the second liquid supply section 341b respectively and enter the liquid cooling cavity 310a to dissipate heat for the coil winding 331.

[0178] For convenience of description, in the following, the liquid supply section 341 of the at least two liquid supply sections 341, the inlet of which is communicated (directly communicated) with the outlet of the liquid inlet channel 35, is referred to as the first liquid supply section 341a, and the liquid supply section 341 of the at least two liquid supply sections 341, the inlet of which is communicated with the outlet of the liquid inlet channel 35 through the bypass channel 36, is referred to as the second liquid supply section 341b.

[0179] It should be noted that, Figure 19 In the embodiment, only one second liquid supply section 341b is provided. For example, in some embodiments, the number of the second liquid supply sections 341b on the support assembly 31 can be two, three, etc.

[0180] Taking two second liquid supply sections 341b as an example, the two second liquid supply sections 341b can be spaced apart 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 channel 35 through a bypass channel 36.

[0181] In the following, the structure of the support assembly 31 and the power motor 30 is further described taking the support assembly 31 having one second liquid supply section 341b as an example.

[0182] When the liquid supply channel 34 comprises a first liquid supply section 341a and a second liquid supply section 341b, the first liquid supply section 341a can be separated from the second liquid supply section 341b in the circumferential direction W of the stator core assembly 32, the first liquid supply section 341a can be arranged opposite to the second liquid supply section 341b in the radial direction X of the stator core assembly 32, or the inlet of the first liquid supply section 341a can be arranged opposite to the inlet of the second liquid supply section 341b in the radial direction X of the stator core assembly 32. In this way, the liquid supply channel 34 can be uniformly arranged on the circumferential side of the core winding assembly. The bypass channel 36 can make the flow of the cooling medium from the liquid supply ports 342 closest to and farthest from the outlet of the liquid inlet channel 35 more uniform, which can improve the uniformity of the cooling medium flowing out of the liquid supply ports 342 spaced apart on the entire circumferential direction W of the support assembly 31.

[0183] Reference Figure 18 As shown in the drawings, the inlet of each liquid supply section 341 can be located at the middle of the liquid supply section 341 in the extension direction of the liquid supply section 341. The middle of the liquid supply section 341 refers to a position close to the middle of the liquid supply section 341. The liquid supply section 341 is provided with liquid supply ports 342 on the channel walls on both sides of the inlet of the liquid supply section 341. That is, the inlet of the first liquid supply section 341a can be located at the middle of the first liquid supply section 341a in the extension direction of the first liquid supply section 341a. The inlet of the second liquid supply section 341b can be located at the middle of the second liquid supply section 341b in the extension direction of the second liquid supply section 341b.

[0184] By limiting the position of the inlet of the liquid supply section 341, the cooling medium can flow in two different directions in the liquid supply section 341 to the liquid cooling cavity 310a at the corresponding far end, and the cooling medium can have a small pressure difference between the far end and the inlet of the liquid supply section 341. This can make the flow of the cooling medium output by each liquid supply port 342 of the liquid supply section 341 more uniform, and can further improve the uniformity of the cooling medium in dissipating heat from the stator winding assembly 33.

[0185] In some embodiments, when the first liquid supply section 341a can be arranged opposite to the second liquid supply section 341b in the radial direction X of the stator core assembly 32, the first cover 312 can be arranged at one end of the stator support 311 provided with the first liquid supply section 341a, and the second cover 313 can be arranged at the other end of the stator support 311 away from the first liquid supply section 341a in the axial direction Z of the stator core assembly 32. At this time, referring to Figure 18 As shown in the drawings, the second cover 313 can be provided with a liquid outlet 315, so that the coil winding 331 can flow through the coil winding 331 in the axial direction Z of the stator core assembly 32, and the heat of the coil winding 331 can be carried away by the cooling medium, and the cooling medium can be output from the liquid outlet 315 after cooling, so that the cooling medium can be reused after cooling, and the utilization rate of the cooling medium can be improved.

[0186] Alternatively, in some embodiments, the liquid outlet 315 can also be arranged on the first cover 312. That is, the liquid outlet 315 can be arranged on the first cover 312 or the second cover 313.

[0187] Referring to Figure 9 and in combination Figure 19 illustrated, in some embodiments, the liquid inlet channel 35 can be located on the side of the liquid supply channel 34 and the bypass channel 36 away from the liquid cooling cavity 310a in the radial direction X of the stator core assembly 32, so as to avoid interference between the liquid inlet channel 35 and the core winding assembly in the liquid cooling cavity 310a.

[0188] Figure 8 A partial schematic view of a stator support 311 on the side of the liquid inlet channel 35 is shown.

[0189] Referring to Figure 20 illustrated, in some embodiments, the opening direction of the outlet of the liquid inlet channel 35 can be along the radial direction X of the stator core assembly 32 and towards the liquid cooling cavity 310a, so that the flow of the cooling medium output from the outlet of the liquid inlet channel 35 can be more uniform along the two sides (such as the two distal ends of the first liquid supply section 341a) of the circumferential direction W of the stator core assembly 32.

[0190] Referring to Figure 20 illustrated, in some embodiments, the support assembly 31 can also have a first sub-flow guide channel 3721. The first sub-flow guide channel 3721 extends along the axial direction Z of the stator core assembly 32.

[0191] For the liquid supply section 341 which is in communication with the inlet of the liquid inlet channel 35: the outlet of the liquid inlet channel 35 is in communication with the inlet of the first sub-flow guide channel 3721, and the outlet of the first sub-flow guide channel 3721 is in communication with the inlet of the liquid supply section 341, so as to realize the communication between the outlet of the liquid inlet channel 35 and the inlet of the first liquid supply section 341a through the first sub-flow guide channel 3721.

[0192] Through the arrangement of the first sub-flow guide channel 3721, the relative position of the inlet of the liquid supply section 341 and the outlet of the liquid inlet channel 35 in the axial direction Z of the stator core assembly 32 can be more flexible. At the same time, since the first sub-flow guide 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 channel 35 can also be diffused along the axial direction Z of the stator core assembly 32 in the first sub-flow guide channel 3721, so that more cooling medium can be uniformly guided along the circumferential direction W of the stator core assembly 32 to the two sides of the circumferential direction W of the stator winding assembly 33, thereby enhancing the uniformity of the flow of the cooling medium along the two sides of the circumferential direction W of the stator winding assembly 33.

[0193] Referring toFigure 20 As shown, in some embodiments, the outlet of the liquid inlet channel 35 can include a first port 351 and a second port 352. For the liquid supply section 341 in communication with the outlet of the liquid inlet channel 35: the first port 351 can be in communication with the inlet of the liquid supply section 341. For example, the first port 351 can be in communication with the inlet of the first liquid supply section 341a. The second port 352 can be in communication with the inlet of the bypass channel 36 to achieve the communication of the outlet of the liquid inlet channel 35 with the inlet of the first liquid supply section 341a and the inlet of the bypass channel 36, respectively.

[0194] Compared with the first liquid supply section 341a, due to the introduction of the bypass channel 36, the path of the cooling medium input by the outlet of the liquid inlet channel 35 into the second liquid supply section 341b is longer, and has a certain flow resistance during the flow process, which can cause the flow of the cooling medium into the second liquid supply section 341b to be smaller. The flow area of the first port 351 can be equal to the flow area of the second port 352, but this can cause the flow of the cooling medium output by the liquid supply port 342 of the second liquid supply section 341b to be smaller than the flow of the cooling medium output by the liquid supply port 342 of the first liquid supply section 341a.

[0195] Therefore, in some embodiments, the flow area of the first port 351 can be smaller than the flow area of the second port 352 to ensure that the flow of the cooling medium input by the outlet of the liquid inlet channel 35 into the bypass channel 36 is larger, thereby overcoming the resistance during the flow in the bypass channel 36, and reducing the difference between the flow of the cooling medium output by the liquid supply port 342 of the second liquid supply section 341b and the flow of the cooling medium output by the liquid supply port 342 of the first liquid supply section 341a, so that the flow of the cooling medium output by the liquid supply port 342 of the second liquid supply section 341b and the flow of the cooling medium output by the liquid supply port 342 of the first liquid supply section 341a are uniform.

[0196] In some embodiments, when the flow area of the first port 351 can be smaller than the flow area of the second port 352, the flow area of the liquid supply section 341 (the first liquid supply section 341a) in communication with the outlet of the liquid inlet channel 35 can be greater than or equal to the flow area of the first port 351, and the flow area of the bypass channel 36 and the liquid supply section 341 (the second liquid supply section 341b) in communication with the bypass channel 36 can be greater than or equal to the flow area of the second port 352. In this way, the cooling medium can quickly enter the liquid cooling cavity 310a through the first liquid supply section 341a or quickly enter the liquid cooling cavity 310a through the second liquid supply section 341b via the bypass channel 36, thereby improving the heat dissipation efficiency of the core winding assembly.

[0197] Referring to Figure 20As shown, in some embodiments, the bypass flow channel 36 can extend along the circumferential direction W of the stator core assembly 32, and the bypass flow channel 36 and the liquid supply flow channel 34 can be 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 flow channel 36 can be arranged on the side of the stator support 311 facing the second baffle cover 313.

[0198] By limiting the extension direction of the bypass flow channel 36 and the arrangement position of the bypass flow channel 36 relative to the liquid supply flow channel 34, on the basis of ensuring that the bypass flow channel 36 conducts the inlet of the second liquid supply section 341b and the outlet of the liquid inlet flow channel 35, compared with the manner in which the bypass flow channel 36 is arranged in a bent manner along the circumferential direction W of the stator core assembly 32, the length of the bypass flow channel 36 can also be controlled within a shorter range, so as to further reduce the pressure difference of the cooling medium when the cooling medium is output from the liquid supply port 342 of the first liquid supply section 341a and the second liquid supply section 341b.

[0199] In addition, by limiting the extension direction of the bypass flow channel 36 and the arrangement position of the bypass flow channel 36 relative to the liquid supply flow channel 34, the arrangement of the bypass flow channel 36 on the support assembly 31 can also be made easier.

[0200] Figure 20 A structural schematic view of a stator support 311 at the outlet position of the bypass flow channel 36 is shown.

[0201] Referring to Figure 21 and Figure 20 As shown, the outlet of the bypass flow channel 36 and the inlet of the bypass flow channel 36 can be located at two ends of the extension direction of the bypass flow channel 36.

[0202] Referring to Figure 21 As shown, in the liquid supply section 341 (the second liquid supply section 341b) communicating with the 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 the stator core assembly 32 through the liquid supply port 342 on the first sub-section 3411 and the second sub-section 3412 at different radial directions X, so that the liquid supply section 341 communicating with the bypass flow channel 36 can supply liquid from the middle section position of the liquid supply section 341. Along 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.

[0203] The bracket assembly 31 also has a second sub-flow guide flow channel 3722. The outlet of the bypass flow channel 36 is communicated with the first sub-section 3411 near one end of the second sub-section 3412 and the second sub-section 3412 near one end of the first sub-section 3411 through the second sub-flow guide flow channel 3722. The second sub-flow guide flow channel 3722 is used to make the flow of the cooling medium flowing into the first sub-section 3411 and the flow of the cooling medium flowing into the second sub-section 3412 uniform. In this way, the flow of the cooling medium output by the liquid supply ports 342 of the first sub-section 3411 and the second sub-section 3412 can be made more uniform, so as to ensure that the cooling medium can have good heat dissipation performance on the core winding assembly when output from different liquid supply ports 342, so as to further improve the uniformity of heat dissipation of the core winding assembly at different parts in the circumferential direction W.

[0204] Referring to Figure 21 As shown in some embodiments, the second sub-flow guide flow channel 3722 can include a first sub-flow guide section 3723 and a second sub-flow guide section 3724. The first sub-section 3411 is communicated with the bypass flow channel 36 through the first sub-flow guide section 3723. The second sub-section 3412 is communicated with the bypass flow channel 36 through the second sub-flow guide section 3724. Through the arrangement of the first sub-flow guide section 3723 and the second sub-flow guide section 3724, the second sub-flow guide flow channel 3722 can realize the communication of the outlet of the bypass flow channel 36 with the first sub-section 3411 and the second sub-section 3412, respectively.

[0205] For example, the second sub-flow guide flow channel 3722 includes a distribution flow channel 373. The distribution flow channel 373 extends along the circumferential direction W of the stator core assembly 32, and one end of the distribution 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-flow guide section 3724 is located at one end of the distribution flow channel 373 away from the outlet of the bypass flow channel 36, the first sub-flow guide section 3723 is located between the outlet of the bypass flow channel 36 and the second sub-flow guide section 3724, and the first sub-flow guide section 3723 is separated from the second sub-flow guide section 3724. The inlet of the first sub-section 3411 is communicated with the distribution flow channel 373 through the first sub-flow guide section 3723, and the inlet of the second sub-section 3412 is communicated with the distribution flow channel 373 through the second sub-flow guide section 3724. Through the arrangement of the distribution flow channel 373, the first sub-flow guide section 3723 and the second sub-flow guide section 3724, the outlet of the bypass flow channel 36 can be communicated with the first sub-section 3411 and the second sub-section 3412, respectively.

[0206] The flow area of the first sub-guide section 3723 can be greater than the flow area of the second sub-guide section 3724. Alternatively, the flow area of the first sub-guide section 3723 can be equal to the flow area 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 the flow direction 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 pass through the second sub-guide section 3724 into the second sub-section 3412. When the flow area of the first sub-guide section 3723 is equal to the flow area of the second sub-guide section 3724, the flow rate of the cooling medium at the inlet of the first sub-section 3411 can be lower than the flow rate of the cooling medium entering the inlet of the second sub-section 3412.

[0207] Therefore, compared to when the flow area of the first sub-guide section 3723 is equal to the flow area of the second sub-guide section 3724, when the flow area of the first sub-guide section 3723 is greater than the flow area of the second sub-guide section 3724, the flow rate of the cooling medium at the inlet of the first sub-section 3411 and the flow rate of the cooling medium at the inlet of the second sub-section 3412 can be uniform, so that the flow rate of the cooling medium output by the liquid supply ports 342 of the first sub-section 3411 and the second sub-section 3412 is more uniform.

[0208] Referring to Figure 21 As shown, the support assembly 31 also has a liquid outlet 315 that communicates with the liquid cooling cavity 310a, so that after the cooling medium dissipates heat from the core winding assembly, it can flow out of the liquid cooling cavity 310a through the liquid outlet 315, so that after the cooling medium dissipates heat, it can again enter the liquid cooling cavity 310a through the liquid inlet flow channel 35, to circulate and dissipate heat from the stator winding assembly 33, improving the utilization rate of the cooling medium.

[0209] In some examples, a plurality of liquid outlets 315 can be provided on the support assembly 31, and the plurality of liquid outlets 315 can be distributed at different positions of the stator support 311, so that after the cooling medium takes away the heat of the coil winding 331, it can be quickly dissipated, improving the utilization rate of the cooling medium.

[0210] It should be noted that in the above embodiments, the support assembly 31 is provided with at least the liquid supply flow channel 34 and the liquid inlet flow channel 35, so that the cooling medium in the liquid supply flow channel 34 can uniformly enter the liquid cooling cavity 310a along the circumferential direction W of the stator winding assembly 33 through the liquid supply flow channel 34, and the coil winding 331 is sufficiently cooled, thereby improving the working performance of the power motor 30.

[0211] However, in some embodiments, the support assembly 31 can also be designed differently, and the coil winding 331 in the stator winding assembly 33 can also be sufficiently cooled, thereby improving the working performance of the power motor 30.

[0212] Figure 19 and Figure 22 Different structure diagrams of two stators in the communication flow channel 38 are shown. Figure 23 A structure diagram of a spraying structure 39 in the power motor 30 is shown.

[0213] The differences between the support assembly 31 and the above embodiments will be further described below in combination with Figure 24 , Figure 8 , and specific embodiments.

[0214] Referring to Figure 19 to Figure 24 , in some embodiments, the cavity wall of the liquid cooling cavity 310a has a liquid outlet 315 and at least two liquid inlets 342. The at least two liquid inlets 342 are arranged at intervals in the axial direction Z of the stator core assembly 32. The liquid inlets 342 are used for supplying the cooling medium into the liquid cooling cavity 310a. The liquid outlet 315 is used for discharging the cooling medium in the liquid cooling cavity 310a.

[0215] By arranging the at least two liquid inlets 342 at intervals in the axial direction Z of the stator core assembly 32, the cooling medium output by the liquid inlet flow channel 35 can be output along the axial direction Z of the stator winding assembly 33 via the at least two liquid inlets 342 into the liquid cooling cavity 310a, so that the temperature of the liquid cooling cavity 310a in the axial direction Z of the stator winding assembly 33 is more uniform, so as to ensure that the temperature of the stator winding assembly 33 in the axial direction Z of the stator core assembly 32 is more uniform, thereby achieving uniform heat dissipation of the coil winding 331 and the stator winding assembly 33 in the axial direction Z of the stator core assembly 32, so as to improve the working performance of the power motor 30.

[0216] Referring to Figure 8 , in some embodiments, the cavity wall of the liquid cooling cavity 310a can also have at least one liquid inlet 342. The liquid cooling cavity 310a is provided with a communication flow channel 38. The at least one liquid inlet 342 communicates with the communication flow channel 38. In this way, when the stator core assembly 32 and other components block the liquid inlet 342 and affect the output of the cooling medium by the liquid inlet 342, the liquid inlet 342 can input the cooling medium into the liquid cooling cavity 310a through the communication flow channel 38, so as to achieve uniform heat dissipation of each part of the stator winding assembly 33, thereby improving the working performance of the power motor 30.

[0217] When the liquid inlet 342 is at least one or at least two, the at least one liquid inlet 342 includes a first liquid inlet 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 located at two ends of the axial direction Z of the stator core assembly 32, respectively. The first end 32a and the second end 32b can be understood as the parts of the stator core assembly 32 at the two ends of the axial direction Z, rather than the two end faces.

[0218] In 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 via the first liquid supply port 3421 and enter the liquid cooling cavity 310a, which is conducive to enhancing the uniformity of the temperature of the liquid cooling cavity 310a in the axial direction Z of the stator winding assembly 33, and cooling the coil winding 331 and the area close to the bottom of the stator winding assembly 33.

[0219] It should be noted that the area close to 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.

[0220] The first liquid supply port 3421 is in communication with the communication flow channel 38, and the part of the liquid cooling cavity 310a in communication with the liquid outlet 315 is in communication with the communication flow channel 38, so as to realize the communication 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. The present application embodiment can avoid the stator core assembly 32 blocking the first liquid supply port 3421, so that the cooling medium can more easily enter the liquid cooling cavity 310a to cool the coil winding 331.

[0221] Referring to Figure 22 In some embodiments, as shown in the axial direction Z of the stator core assembly 32, there is a first spacing 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 spacing space 310b between the first end 32a of the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a.

[0222] The liquid outlet 315 can be in communication with the first spacing space 310b. The first spacing space 310b is in communication with the communication flow channel 38, so that the communication flow channel 38 can be in communication with the part of the liquid cooling cavity 310a in communication with the liquid outlet 315 through the first spacing 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 flow to the liquid outlet 315 via the first spacing space 310b, and finally output the liquid cooling cavity 310a from the liquid outlet 315, realizing the cooling of the coil winding 331.

[0223] Referring to Figure 22As shown, when the first spacing space 310b is formed 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. The first surface of the stator core assembly 32 is opposite to the cavity wall of the liquid cooling cavity 310a where the liquid inlet 342 is arranged. 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 where the first liquid inlet 3421 is arranged form the communication flow channel 38.

[0224] The first groove 32c penetrates the end of the stator winding assembly 33. For example, the first groove 32c penetrates the first end 32a of the stator winding assembly 33. In this way, the groove cavity of the first groove 32c is in communication with the first spacing space 310b, so as to realize the communication between the communication flow channel 38 and the first spacing space 310b. In this way, the cooling medium flowing in the communication flow channel 38 can enter the first spacing space 310b after absorbing the heat of the coil winding 331, and then be output from the liquid outlet 315 of the liquid cooling cavity 310a.

[0225] At the same time, by forming the communication flow channel 38 through the first groove 32c and the cavity wall of the liquid cooling cavity 310a where the liquid inlet 342 is arranged, the cooling medium flowing in the communication flow channel 38 can exchange heat with the stator core assembly 32 and the coil winding 331 wound on the stator core assembly 32 for a longer path before entering the first spacing space 310b, so as to sufficiently dissipate the heat of the coil winding 331, improve the heat dissipation effect of the coil winding 331, and improve the utilization rate of the cooling medium.

[0226] Referring to Figure 22 As shown, when the first spacing space 310b is formed 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. The first surface of the stator core assembly 32 is opposite to the cavity wall of the liquid cooling cavity 310a where the liquid inlet 342 is arranged. 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 where the first liquid inlet 3421 is arranged form the communication flow channel 38.

[0227] For example, the liquid cooling cavity 310a is provided with a second groove 3111 on the cavity wall where the first liquid supply port 3421 is located. The first liquid supply port 3421 is located on the groove wall of the second groove 3111. In 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 groove cavity of the second groove 3111 is in communication with the first spacing space 310b.

[0228] The present application can make the groove cavity of the second groove 3111 communicate with the first spacing space 310b by limiting the position of the second groove 3111, so as to realize the communication of the communication flow channel 38 and the first spacing space 310b. In this way, the cooling medium can also flow through the first spacing space 310b and the liquid outlet 315 after absorbing the heat of the coil winding 331 in the communication flow channel 38.

[0229] At the same time, the cooling medium can also flow in the communication flow channel 38 to sufficiently cool the coil winding 331, improve the heat dissipation effect of the coil winding 331, and improve the utilization rate of the cooling medium. The reasons can be found in the description of the first groove 32c above, which will not be repeated here.

[0230] Referring to Figure 22 In some embodiments, the stator core assembly 32 has a communication hole that forms the communication flow channel 38. By providing the communication hole, the liquid supply port 342 is also in communication with the liquid cooling cavity 310a, so that the cooling medium can enter the communication hole when output through the liquid supply port 342, enter the liquid cooling cavity 310a, and fully contact and cool the coil winding 331.

[0231] 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 the two sides of the core fixing ring 322 in the radial direction. The core fixing ring 322 in the radial direction can also refer to the direction X.

[0232] Referring to Figure 23As shown, the through hole penetrates the first surface and the second surface, and the through hole at one end of the first surface of the core fixing ring 322 is in communication with the first liquid supply port 3421. Specifically, the first surface of the core fixing ring 322 is opposite to the cavity wall of the liquid cooling cavity 310a provided with the liquid supply port 342, so that the through hole at one end of the first surface is in communication with the first liquid supply port 3421. The second surface has a second spacing space 310c between the second surface and the cavity wall of the liquid cooling cavity 310a, and the through hole at one end of the second surface is in communication with the second spacing space 310c, and the second spacing space 310c is in communication with the liquid outlet 315. In this way, the cooling medium output from the first liquid supply port 3421 can flow along the through hole into the second spacing space 310c, so as to facilitate efficient heat dissipation of the coil winding 331.

[0233] Next, 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 are further described.

[0234] Referring to Figure 23 and Figure 22 As shown, the at least two liquid supply ports 342 include a second liquid supply port 3422. For example, the at least two liquid supply ports 342 can include a plurality of second liquid supply ports 3422.

[0235] In some examples, in 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 by the second liquid supply port 3422 flows in the axial direction Z of the stator core assembly 32, the contact area of the cooling medium output by the second liquid supply port 3422 with the coil winding 331 can be increased, so as to dissipate heat from the coil winding 331 at various positions in the axial direction Z of the stator core assembly 32.

[0236] Referring to Figure 23As shown, when the at least two liquid supply ports 342 include the second liquid supply port 3422, in some examples, the liquid cooling cavity 310a can further be provided with a spray structure 39 on the cavity wall of the liquid cooling cavity 310a. In the axial direction Z of the stator core assembly 32, the spray structure 39 is located close to the second end 32b of the stator core assembly 32. For example, the spray structure 39 can 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 in communication with the spray structure 39, and the spray openings of the spray structure 39 are in communication with the liquid cooling cavity 310a, and the spray openings of the spray structure 39 are configured to spray in the direction of the stator core assembly 32. In this way, the cooling medium entering the spray structure 39 can be sprayed onto the coil winding 331 wound on the stator core assembly 32 through the plurality of spray openings, which can increase the contact area of the cooling medium output by the second liquid supply port 3422 with the coil winding 331 in the radial direction X of the stator core assembly 32, so that the heat dissipation of the coil winding 331 at each position in the radial direction X of the stator core assembly 32 is more uniform, and the heat dissipation effect of the cooling medium output by the second liquid supply port 3422 on the coil winding 331 can be further improved.

[0237] In some examples, since 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 in the axial direction Z of the stator core assembly 32, the spray structure 39 can be provided on the first cover 312 so that the spray structure 39 is in communication with the second liquid supply port 3422. For example, the spray structure 39 can be a spray flow channel in the first cover 312, and the flow channel wall of the spray flow channel is provided with a plurality of spray openings. The plurality of spray openings can be provided on the flow channel wall of the spray flow channel in the radial direction X of the stator core assembly 32 to ensure that the cooling medium output through the plurality of spray openings can be sprayed in the direction of the stator core assembly 32 in the radial direction X of the stator core assembly 32.

[0238] Referring to Figure 24 As shown, in some embodiments, when the at least two liquid supply ports 342 include the second liquid supply port 3422, the at least two liquid supply ports 342 can include the first liquid supply port 3421 and the second liquid supply port 3422. In the axial direction Z 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 the first liquid supply port 3421 is located between the first end 32a and the second end 32b in the axial direction Z of the stator core assembly 32, 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.

[0239] By limiting the arrangement of the first liquid supply port 3421 and the second liquid supply port 3422 and the position of the liquid outlet 315 relative to the first liquid supply port 3421 in 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 in the axial direction Z of the stator core assembly 32, and the first liquid supply port 3421 is located between the second liquid supply port 3422 and the liquid outlet 315.

[0240] The cooling medium output by 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 along the axial direction Z of the stator core assembly 32 towards the liquid outlet 315.

[0241] The cooling medium output by the first liquid supply port 3421 can dissipate heat from the coil winding 331 at the intermediate region between the second end 32b and the first end 32a of the stator core assembly 32, and the cooled cooling medium can also flow along the axial direction Z of the stator core assembly 32 towards the liquid outlet 315 to reduce the temperature difference of the liquid cooling cavity 310a in the axial direction Z of the stator core assembly 32. In this way, the cooling medium output by the first liquid supply port 3421 and the second liquid supply port 3422 can be fully utilized, and the utilization rate of the cooling medium can be further improved while improving the uniformity of heat dissipation from the coil winding 331 in the axial direction Z of the stator core assembly 32.

[0242] In some embodiments, the flow area of the first liquid supply port 3421 can be smaller than the flow area of the second liquid supply port 3422, so as to ensure that the cooling medium output by the first liquid supply port 3421 can effectively dissipate heat from the coil winding 331, while avoiding that the first liquid supply port 3421 outputs too much cooling medium to affect the utilization rate of the cooling medium.

[0243] Referring to Figure 24 In some embodiments, the bracket assembly 31 has a liquid inlet flow channel 35 and at least two liquid supply flow channels 34. In the axial direction Z of the stator core assembly 32, the at least two liquid supply flow channels 34 are sequentially distributed. The flow channel wall of the liquid supply flow channel 34 has a liquid supply port 342, and the liquid supply flow channel 34 communicates with the liquid cooling cavity 310a through the liquid supply port 342. The inlet of the liquid supply flow channel 34 communicates with the outlet of the liquid inlet flow channel 35, so that the cooling medium can supply liquid to the connected liquid supply port 342 after entering the at least two liquid supply flow channels 34 from the liquid inlet flow channel 35.

[0244] Referring to Figure 19As shown in some embodiments, the at least two liquid supply channels 34 include a first liquid supply channel 34a and a second liquid supply channel 34b. The first liquid supply channel 34a and the second liquid supply channel 34b are sequentially arranged in the axial direction Z of the stator core assembly 32, 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, in 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. 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.

[0245] By limiting 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 in the axial direction Z of the stator core assembly 32, which can further improve the utilization rate of the cooling medium while improving the uniformity of heat dissipation of the coil winding 331 along the axial direction Z of the stator core assembly 32.

[0246] Referring to Figure 19 , Figure 15 and Figure 20 As shown in some embodiments, the at least one liquid supply channel 34 includes at least two liquid supply sections 341 arranged 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 communicates 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 communicates with the outlet of the liquid inlet channel 35, and the inlets of the remaining liquid supply sections 341 communicate with the bypass channel 36, and the inlet of the bypass channel 36 communicates with the liquid inlet channel 35.

[0247] For example, Figure 21 As shown in the second liquid supply channel 34b includes at least two liquid supply sections 341 arranged along the circumferential direction W of the stator core assembly 32, the second liquid supply channel 34b can include the first liquid supply section 341a mentioned above, or the first liquid supply section 341a and the second liquid supply section 341b.

[0248] In some examples, the second liquid supply channel 34b can also include the liquid supply channel 34 formed by the first liquid supply section 341a, or the first liquid supply section 341a and the second liquid supply section 341b. Figure 15 As shown in 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 communicate with the outlet of the liquid inlet channel 35, and the inlet of the second liquid supply section 341b can communicate with the outlet of the liquid inlet channel 35 through the bypass channel 36.

[0249] By providing the bypass channel 36 in the liquid supply channel 34 and the at least two liquid supply sections 341 in the liquid supply channel 34, the coil winding 331 and the stator winding assembly 33 can be cooled more evenly at various locations in the circumferential direction W, thereby improving the operating performance of the power motor 30. The specific reasons for this can be found in the relevant description above and will not be repeated here.

[0250] See also Figure 15 、 Figure 15 and Figure 20 As shown, in some embodiments, in the axial direction Z 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 bracket assembly 31 also has a guide channel 37. The guide channel 37 has a first guide channel 371 and a second guide 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 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 guide channel 372. The outlet of the liquid inlet channel 35 can be connected to the inlet of the first liquid supply channel 34a through the first guide channel 371, and the outlet of the liquid inlet channel 35 can be connected to the inlet of the second liquid supply channel 34b through the second guide channel 372. In this way, the liquid inlet channel 35 can supply liquid to the first liquid supply channel 34a and the second liquid supply channel 34b at the same time. The guide path between the liquid inlet channel 35 and the first liquid supply channel 34a and the second liquid supply channel 34b is short, and the arrangement is convenient.

[0251] See also Figure 21 and Figure 20 As shown, the second diversion channel 372 may include the first sub-diversion channel 3721 and the second sub-diversion channel 3722 mentioned above. The connection between the first sub-diversion channel 3721 and the second sub-diversion channel 3722 between the liquid inlet channel 35 and the liquid supply section 341 of the second liquid supply channel 34b can be seen in the relevant description above and will not be repeated here.

[0252] See also Figure 21 and Figure 20As shown, the first flow guide passage 371 includes a third sub-flow guide passage 3711. The third sub-flow guide passage 3711 and the first sub-flow guide passage 3721 are spaced apart along the axial direction Z of the stator core assembly 32 and arranged on the bracket assembly 31 (e.g., 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 passage 35 and communicate with the outlet of the liquid inlet passage 35. The first sub-flow guide passage 3721 communicates the outlet of the liquid inlet passage 35 with the first liquid supply section 341a in the second liquid supply passage 34b, so that the cooling medium output by the outlet of the liquid inlet passage 35 can enter the first liquid supply section 341a in the second liquid supply passage 34b. The third sub-flow guide passage 3711 communicates the outlet of the liquid inlet passage 35 with the first liquid supply section 341a in the first liquid supply passage 34a, so that the cooling medium output by the outlet of the liquid inlet passage 35 can enter the first liquid supply section 341a in the first liquid supply passage 34a.

[0253] The first flow guide passage 371 further includes a fourth sub-flow guide passage 3712. The inlet of the third sub-flow guide passage 3711 and the fourth sub-flow guide passage 3712 are oppositely arranged on the bracket assembly 31 (e.g., the stator bracket 311) along the radial direction X of the stator core assembly 32. The outlet of the bypass passage 36 communicates with the inlet of the second liquid supply section 341b in the first liquid supply passage 34a through the fourth sub-flow guide passage 3712, so that the cooling medium output by the outlet of the liquid inlet passage 35 can enter the inlet of the second liquid supply section 341b in the first liquid supply passage 34a via the bypass passage 36 and the fourth sub-flow guide passage 3712, and flow along the first sub-section 3411 and the second sub-section 3412 of the second liquid supply section 341b, and be 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.

[0254] Referring to Figure 21 As shown, the fourth sub-flow guide passage 3712 includes a third sub-flow guide section 3713 and a fourth sub-flow guide section 3714. The third sub-flow guide section 3713 and the fourth sub-flow guide section 3714 respectively communicate with two ends of the distribution passage 373 in the flow direction, and the third sub-flow guide section 3713 is located on one side of the distribution passage 373 adjacent to the bypass passage 36, and the fourth sub-flow guide section 3714 is located on one side of the distribution passage 373 adjacent to the third sub-flow guide passage 3711. Among them, the flow area of the third sub-flow guide section 3713 is greater than that of the fourth sub-flow guide section 3714, so that the flow of the cooling medium entering the third sub-flow guide section 3713 and the fourth sub-flow guide section 3714 via the bypass passage 36 is uniform.

[0255] Through the arrangement of the third sub-flow guide passage 3711 and the fourth sub-flow guide passage 3712, the outlet of the bypass passage 36 can communicate with the first sub-section 3411 and the second sub-section 3412 of the second liquid supply section 341b in the first liquid supply passage 34a.

[0256] It is to be noted that the cooling medium outputted from the outlet of the bypass flow channel 36 enters the distribution flow channel 373, and then flows to the first sub-guide flow channel 3721 to the fourth sub-guide flow channel 3712 through the distribution flow channel 373, so that the cooling medium can flow into the first liquid supply flow channel 34a and the second liquid supply section 341b of the second liquid supply flow channel 34b.

[0257] 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.

[0258] By limiting the flow area of the first guide flow channel 371 and the second guide flow channel 372, the flow of the cooling medium from the first liquid supply flow channel 34a and the liquid supply port 342 of the first liquid supply flow channel 34a can be larger, which is beneficial to uniform heat dissipation in the axial direction Z.

[0259] Referring to Figure 21 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 in communication with the inlet of the radiator 40, and the outlet of the radiator 40 is in communication with the inlet of the liquid inlet flow channel 35 of the power motor 30. In this way, the radiator 40 can dissipate heat from the cooling medium outputted from the liquid outlet 315, so that when the cooling medium flows back to the liquid cooling cavity 310a through the liquid inlet flow channel 35 and the liquid supply flow channel 34, it can also continue to carry away heat from the coil winding 331, dissipate heat from the coil winding 331, and improve the utilization rate of the cooling medium.

[0260] Referring to Figure 2 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 air-cool the radiator 40.

[0261] Figure 2 and Figure 25 The structure schematic diagrams of the liquid pump 60 at different viewing angles are shown.

[0262] Referring to Figure 26 and Figure 25 In some embodiments, the electric motor 21 can further include a liquid pump 60. The liquid pump 60 can be arranged on the power motor 30.

[0263] Referring toFigure 26 Figure 26 As shown, the liquid pump 60 has a medium inlet 61 and a medium outlet 62. The medium inlet 61 of the liquid pump 60 is communicated 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 is communicated with the inlet of the liquid inlet flow channel 35 of the power motor 30, so that the cooling medium output by the liquid outlet 315 can flow back to the liquid inlet flow channel 35 again under the action of the liquid pump 60 after being cooled by the radiator 40, to realize the circulating flow of the cooling medium, so as to further improve the utilization rate of the cooling medium.

[0264] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part 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 (30), 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 support assembly (31) further comprises a liquid supply channel (34) and a liquid inlet channel (35); The inlet of the liquid supply channel (34) is connected to the outlet of the liquid inlet channel (35), the liquid supply channel (34) extends along the outer circumference of the stator core assembly (32), the channel wall of the liquid supply channel (34) has a plurality of liquid supply ports (342) spaced apart along the extension direction of the liquid supply channel (34), and the liquid supply channel (34) is connected to the liquid cooling chamber (310a) through the liquid supply ports (342); The flow area of ​​the liquid supply port (342) close to the inlet of the liquid supply channel (34) is smaller than the flow area of ​​the liquid supply port (342) far from the inlet of the liquid supply channel (34).

2. The power motor (30) according to claim 1, characterized in that: In the extension direction of the liquid supply channel (34), the inlet of the liquid supply channel (34) is located in the middle section of the liquid supply channel (34), and the 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).

3. The power motor (30) according to claim 1, characterized in that: In the radial direction of the stator core assembly (32), the liquid inlet channel (35) is located on a side of the liquid supply channel (34) away from the liquid cooling cavity (310a); The opening direction of the outlet of the liquid inlet channel (35) is along the radial direction of the stator core assembly (32) and toward the liquid cooling cavity (310a).

4. The power motor (30) according to claim 1, characterized in that: The liquid supply channel (34) comprises at least two liquid supply sections (341) distributed along the circumference of the stator core assembly (32), the liquid supply sections (341) extending along the outer circumference of the stator core assembly (32), the channel wall of the liquid supply section (341) having a plurality of liquid supply ports (342) distributed at intervals along the extension direction of the liquid supply section (341), and the liquid supply section (341) is connected to the liquid cooling chamber (310a) through the liquid supply ports (342); In the same liquid supply section (341), the flow area of ​​the liquid supply port (342) close to the inlet of the liquid supply section (341) is smaller than the flow area of ​​the liquid supply port (342) far from the inlet of the liquid supply section (341); The bracket assembly (31) further comprises a bypass flow channel (36), wherein the inlet of one of the at least two liquid supply sections (341) is connected to the outlet of the liquid inlet flow channel (35), the inlet of the remaining liquid supply section (341) is connected to the bypass flow channel (36), and the inlet of the bypass flow channel (36) is connected to the liquid inlet flow channel (35).

5. The power motor (30) according to claim 4, characterized in that: In the extension direction of the liquid supply channel (34), at least two adjacent liquid supply sections (341) are separated and arranged.

6. The power motor (30) according to claim 4, characterized in that: The support assembly (31) further comprises a first sub-flow guiding channel (3721), wherein the first sub-flow guiding channel (3721) extends along the axial direction of the stator core assembly (32); For the liquid supply section (341) whose inlet is connected to the outlet of the liquid inlet channel (35): the outlet of the liquid inlet channel (35) is connected to the inlet of the first sub-guiding channel (3721), and the outlet of the first sub-guiding channel (3721) is connected to the inlet of the liquid supply section (341).

7. The power motor (30) according to claim 4, characterized in that: The bypass flow channel (36) extends along the outer circumference of the stator core assembly (32), and the bypass flow channel (36) and the liquid supply flow channel (34) are arranged in sequence along the axial direction of the stator core assembly (32).

8. The power motor (30) according to claim 7, characterized in that: The outlet of the bypass flow channel (36) and the inlet of the bypass flow channel (36) are respectively located at two ends of the extension direction of the bypass flow channel (36); In the liquid supply section (341) connected to the bypass flow channel (36), the liquid supply section (341) includes a first subsection (3411) and a second subsection (3412) distributed along the circumference of the stator core assembly (32); The support assembly (31) also has a second sub-guiding flow channel (3722), and the outlet of the bypass flow channel (36) is connected to the end of the first sub-segment (3411) close to the second sub-segment (3412) and the end of the second sub-segment (3412) close to the first sub-segment (3411) through the second sub-guiding flow channel (3722). The second sub-guiding flow channel (3722) is used to make the flow rate of the cooling medium flowing into the first sub-segment (3411) and the cooling medium flowing into the second sub-segment (3412) uniform.

9. The power motor (30) according to claim 8, characterized in that: The flow direction of the cooling medium in the first subsection (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 subsection (3412) is the same as the flow direction of the cooling medium in the bypass flow channel (36); The second sub-flow guiding channel (3722) includes a first sub-flow guiding section (3723) and a second sub-flow guiding section (3724); The first sub-section (3411) is connected to the bypass flow channel (36) through the first sub-guiding section (3723), and the second sub-section (3412) is connected to the bypass flow channel (36) through the second sub-guiding section (3724). The flow area of ​​the first sub-guiding section (3723) is greater than the flow area of ​​the second sub-guiding section (3724).

10. The power motor (30) according to claim 4, characterized in that: The liquid inlet channel (35) includes a first port (351) and a second port (352); For the liquid supply section (341) whose inlet is connected to the outlet of the liquid inlet channel (35): the first port (351) is connected to the inlet of the liquid supply section (341); The second port (352) is in communication with the inlet of the bypass channel (36); The flow area of ​​the first port (351) is smaller than the flow area of ​​the second port (352); The flow area of ​​the liquid supply section (341) whose inlet is connected to the outlet of the liquid inlet channel (35) is greater than or equal to the flow area of ​​the first port (351), and / or the flow area of ​​the bypass channel (36) and the liquid supply section (341) connected to the bypass channel (36) is greater than or equal to the flow area of ​​the second port (352).

11. The power motor (30) according to claim 4, characterized in that: 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 in communication with the outlet of the liquid inlet channel (35), and the inlet of the second liquid supply section (341b) is in communication with the bypass channel (36); The first liquid supply section (341a) and the second liquid supply section (341b) are arranged opposite to each other along the radial direction of the stator core assembly (32); and / or, The inlet of the first liquid supply section (341a) and the inlet of the second liquid supply section (341b) are arranged opposite to each other along the radial direction of the stator core assembly (32).

12. The power motor (30) according to any one of claims 1 to 11, characterized in that: The support assembly (31) includes 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 radially outer side of the stator bracket (311); The sleeve (314) is sleeved on the radially outer side of the stator core assembly (32); The first stop cover (312) is connected to the sleeve (314) and one end of the stator bracket (311), and the first stop cover (312) is sealedly connected to the sleeve (314) and the stator bracket (311); The second blocking cover (313) is connected to 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 bracket (311), the sleeve (314), the first blocking cover (312) and the second blocking cover (313) are used to enclose and form the liquid cooling cavity (310a); the liquid supply channel (34) and the liquid inlet channel (35) are located on the stator bracket (311).

13. An electric motor (21), characterized in that It comprises a radiator (40) and a power motor (30) according to any one of claims 1 to 12; The liquid cooling chamber (310a) of the power motor (30) is in communication with the inlet of the radiator (40), and the outlet of the radiator (40) is in communication with the inlet of the liquid inlet channel (35) of the power motor (30).

14. An electric propulsion device (20), characterized in that comprising a propeller (22) and an electric motor (21) as claimed in claim 13; The electric motor (21) is transmission-connected to the propeller (22).

15. An aircraft, characterized in that: comprising a fuselage (11), wings (12), a tail wing (13) and an electric propulsion device (20) as claimed in claim 14; The electric propulsion device (20) is arranged on the wing (12), and / or the fuselage (11), and / or the tail wing (13).

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