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 cavity wall of the liquid cooling cavity is provided with a liquid outlet and at least one liquid supply port. A communication flow channel is arranged in the liquid cooling cavity, the at least one liquid supply port is communicated with the communication flow channel, and the part, communicated with the liquid outlet, of the liquid cooling cavity is communicated with the communication flow channel. The liquid supply port is used for allowing a cooling medium to flow into the liquid cooling cavity, and the liquid outlet is used for allowing the cooling medium in the liquid cooling cavity to flow out. Therefore, the liquid cooling heat dissipation of the stator winding assembly in the power motor can be conveniently realized, and the working performance of the power motor can be improved.

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 propulsion system, the electric propulsion system includes a power motor, the power motor is in transmission connection with the propeller and is used to drive the propeller to rotate. During the operation of the power motor, the heat generated by the power motor continuously accumulates as the working time increases, 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 facilitate liquid cooling heat dissipation of a 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 bracket assembly, a stator core assembly and a stator winding assembly wound on the stator core assembly, the bracket assembly has a liquid cooling cavity, and the stator core assembly and the stator winding assembly are arranged in the liquid cooling cavity;

[0006] The cavity wall of the liquid cooling cavity has a liquid outlet and at least one liquid inlet;

[0007] The liquid cooling cavity is provided with a communication flow channel, the at least one liquid inlet is in communication with the communication flow channel, and the part of the liquid cooling cavity communicating with the liquid outlet is in communication with the communication flow channel;

[0008] The liquid inlet is used for supplying the cooling medium to flow into the liquid cooling cavity, and the liquid outlet is used for supplying the cooling medium in the liquid cooling cavity to flow out.

[0009] The electric engine provided by the embodiment of the present application can input the cooling medium into the liquid cooling cavity through the communication flow channel when the stator core assembly and other components shield the liquid inlet and affect the output of the cooling medium by the liquid inlet, so as to uniformly dissipate heat of each part of the stator winding assembly, thereby improving the working performance of the power motor.

[0010] In some possible implementation manners, in the axial direction of the stator core assembly, there is a first spacing space between the end of the stator core assembly and the cavity wall of the liquid cooling cavity;

[0011] The liquid outlet is in communication with the first spacing space, and the first spacing space is in communication with the communication flow channel.

[0012] In some possible implementation manners, the stator core assembly comprises a first surface;

[0013] The first surface has a first groove, the first groove and the cavity wall of the liquid cooling cavity provided with the liquid inlet form a communication flow channel, and the first groove penetrates the end of the stator core assembly, so that the groove cavity of the first groove communicates with the first spacing space.

[0014] In some possible implementation manners, the cavity wall of the liquid cooling cavity has a second groove provided with a liquid inlet, the second groove and the stator core assembly form a communication flow channel, and the groove wall of the second groove has a liquid inlet;

[0015] In the axial direction of the stator core assembly, one end of the second groove is located between the stator core assembly and the cavity wall of the liquid cooling cavity, so that the groove cavity of the second groove communicates with the first spacing space.

[0016] In some possible implementation manners, the stator core assembly has a communication hole, and the communication hole forms a communication flow channel;

[0017] The stator core assembly comprises a core fixing ring;

[0018] The core fixing ring comprises a first surface and a second surface, the first surface and the second surface are respectively located on two sides of the core fixing ring in the radial direction, the communication hole penetrates the first surface and the second surface, the first surface is opposite to the cavity wall of the liquid cooling cavity provided with the liquid inlet, the second surface has a second spacing space with the cavity wall of the liquid cooling cavity, one end of the communication hole located on the second surface communicates with the second spacing space, and the second spacing space communicates with the liquid outlet.

[0019] In some possible implementation manners, the at least one liquid inlet comprises a first liquid inlet;

[0020] The stator core assembly comprises a first end and a second end, and the first end and the second end are respectively located at two ends of the stator core assembly in the axial direction;

[0021] In the axial direction of the stator core assembly, the first liquid inlet is located between the first end and the second end.

[0022] In some possible implementation manners, the cavity wall of the liquid cooling cavity has at least two liquid inlets;

[0023] In the axial direction of the stator core assembly, the at least two liquid inlets are arranged at intervals.

[0024] In some possible implementation manners, the at least two liquid inlets comprise a second liquid inlet;

[0025] The stator core assembly comprises a first end and a second end, and the first end and the second end are respectively located at two ends of the stator core assembly in the axial direction;

[0026] The second liquid supply port is located on the side of the second end away from the first end in the axial direction of the stator core assembly.

[0027] In some possible implementation manners, the at least two liquid supply ports include a second liquid supply port;

[0028] The stator core assembly includes a first end and a second end, which are respectively located at two ends of the axial direction of the stator core assembly, and the liquid cooling cavity is provided with a spraying structure;

[0029] The spraying structure is located on the side of the second end away from the first end in the axial direction of the stator core assembly.

[0030] The second liquid supply port is in communication with the spraying structure, the spraying port of the spraying structure is in communication with the liquid cooling cavity, and the spraying port of the spraying structure is configured to spray toward the direction of the stator core assembly.

[0031] In some possible implementation manners, the at least two liquid supply ports include a first liquid supply port and a second liquid supply port;

[0032] The first liquid supply port and the second liquid supply port are arranged at intervals in the axial direction of the stator core assembly, and the liquid outlet is located on the side of the first liquid supply port away from the second liquid supply port.

[0033] The flow area of the first liquid supply port is smaller than the flow area of the second liquid supply port.

[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, and the sleeve is sleeved on the outer side of the stator core assembly in the radial direction;

[0036] 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;

[0037] 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;

[0038] The stator bracket, the sleeve, the first cover, and the second cover are used to form the liquid cooling cavity, the liquid supply port is located on the stator bracket, and the liquid outlet is located on the first cover or the second cover.

[0039] 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;

[0040] The liquid outlet of the power motor is in communication with the inlet of the radiator, and the liquid supply port of the power motor is in communication with the outlet of the radiator.

[0041] 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.

[0042] The electric motor is in driving connection with the propeller.

[0043] The fourth aspect of the embodiments of the present application provides a flying vehicle. The flying vehicle comprises a fuselage, a wing, a tail wing and an electric propulsion device as above;

[0044] The electric propulsion device is arranged on the wing, and / or the fuselage, and / or the tail wing. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative labor under the premise of the drawings.

[0046] Figure 1 A structural schematic diagram of a flying vehicle provided by the embodiments of the present application is shown in the figure;

[0047] Figure 2 A structural schematic diagram of an electric motor provided by the embodiments of the present application is shown in the figure;

[0048] Figure 3 A structural schematic diagram of a power motor provided by the embodiments of the present application is shown in the figure from a first perspective;

[0049] Figure 4 An exploded view of a power motor provided by the embodiments of the present application is shown in the figure;

[0050] Figure 5 A partial schematic diagram of a stator winding assembly provided by the embodiments of the present application is shown in the figure;

[0051] Figure 6 An internal schematic diagram of a power motor provided by the embodiments of the present application is shown in the figure;

[0052] Figure 7 A partial schematic diagram of a power motor provided by the embodiments of the present application is shown in the figure; Figure 6 A partial schematic diagram of a power motor provided by the embodiments of the present application is shown in the figure;

[0053] Figure 8 A partial internal schematic diagram of a power motor provided by the embodiments of the present application is shown in the figure; Figure 1 ;

[0054] Figure 9 A partial internal schematic diagram of a power motor provided by the embodiments of the present application is shown in the figure; Figure 2 ;

[0055] Figure 10 A structural diagram of a power motor provided by the embodiments of the present application is shown in the figure from a second perspective;

[0056] Figure 11 Fig. 1 is a schematic diagram of a power machine according to an embodiment of the present application; Figure 10 Fig. 2 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 1 Fig. 3 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 4 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0057] Fig. 5 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 12 Fig. 6 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 11 Fig. 7 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 8 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0058] Fig. 9 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 13 Fig. 10 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 11 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0059] Fig. 12 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 14 Fig. 13 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 14 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0060] Fig. 15 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 15 Fig. 16 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 17 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0061] Fig. 18 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 16 Fig. 19 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 2 Fig. 20 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 21 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0062] Fig. 22 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 17 Fig. 23 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 24 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0063] Fig. 25 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 18 Fig. 26 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 1 Fig. 27 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 28 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0064] Fig. 29 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 19 Fig. 30 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 2 Fig. 31 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 32 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0065] Fig. 33 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 20 Fig. 34 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 35 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0066] Fig. 36 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 21 Fig. 37 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 38 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0067] Fig. 39 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 22 Fig. 40 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 41 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0068] Fig. 42 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 23 Fig. 43 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 44 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0069] Fig. 45 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 24 Fig. 46 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Fig. 47 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application;

[0070] Fig. 48 is a schematic diagram of a partial view of a power machine according to an embodiment of the present application; Figure 25A structural schematic diagram of a liquid pump provided by an embodiment of the present application in a first perspective view;

[0071] Figure 26 A structural schematic diagram of a liquid pump provided by an embodiment of the present application in a second perspective view.

[0072] Reference signs:

[0073] 11, fuselage; 12, wing; 13, tail; 14, arm; 15, nacelle;

[0074] 20, electric propulsion device; 20a, fixed electric propulsion device; 20b, tilting electric propulsion device; 21, electric motor; 22, propeller;

[0075] 30, power motor;

[0076] 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;

[0077] 32, stator core assembly; 32a, first end; 32b, second end; 32c, first groove; 321, stator core; 3211, protrusion; 322, core fixing ring; 3221, groove;

[0078] 33, stator winding assembly; 331, coil winding; 332, insulating paper;

[0079] 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;

[0080] 35, liquid inlet channel; 351, first port; 352, second port;

[0081] 36, bypass channel;

[0082] 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;

[0083] 38, communication channel;

[0084] 39. a spray structure;

[0085] 40. a heat sink;

[0086] 50. a fan;

[0087] 60. a liquid pump; 61. a medium inlet; 62. a medium outlet. DETAILED DESCRIPTION

[0088] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 work fall within the protection scope of the present application.

[0089] It should be noted that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0090] 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 those 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.

[0091] In the present application, unless otherwise explicitly specified and limited, the first feature is "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 indirectly in 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.

[0092] 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.

[0093] 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.

[0094] In the following Figure 1 , the structure of the aircraft is described.

[0095] 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.

[0096] 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 is symmetrical 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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).

[0101] 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).

[0102] 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 .

[0103] 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.

[0104] In some examples, all electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20 a.

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

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] Figure 1 A structural schematic diagram of an electric motor 21 is shown.

[0111] Referring to 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.

[0112] 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.

[0113] 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.

[0114] Referring to 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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 the 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.

[0120] 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 volume of the electric motor will be large, and the heat dissipation demand of the power motor cannot be met.

[0121] In the related art, the power motor is usually provided with a liquid supply port, which can provide cooling medium for the stator winding assembly in the power motor to dissipate heat through the cooling medium. However, the liquid supply of the existing power motor is uneven, which can easily cause the stator winding assembly to be unevenly cooled. The stator winding assembly is the heat source of the power motor, and when the stator winding assembly is unevenly cooled, it will affect the improvement of the working performance of the power motor.

[0122] The embodiment of the present application provides a power motor 30. The core winding assembly is arranged in the liquid cooling cavity 310a of the support assembly 31, and the support assembly 31 at least has a liquid supply flow channel 34 and a liquid inlet flow channel 35. The liquid supply flow channel 34 is connected with the liquid supply flow channel 34 and the liquid cooling cavity 310a, so that the cooling medium in the liquid supply flow channel 34 can enter the liquid cooling cavity 310a through the liquid supply flow channel 34 to cool the coil winding 331, and at the same time, the cooling of the stator winding assembly 33 in the core winding assembly in the circumferential direction of each part is more uniform, and the working performance of the power motor 30 is improved.

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

[0124] Hereinafter, the structure of the power motor 30 provided by the embodiment of the present application will be further described with the cooling medium being the cooling oil as an example, in combination with the drawings and the embodiment.

[0125] Referring to Figure 4 and Figure 3 As described above, the power motor 30 includes a support assembly 31 and a core winding assembly. Figure 4 The structure of the stator core assembly 32 and the stator winding assembly 33 in the core winding assembly is shown in

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

[0127] Referring to Figure 5 In addition to the coil winding 331, the stator winding assembly 33 also includes an insulating paper 332, and the side of the same coil winding 331 facing the wound stator core 321 is provided with the insulating paper 332.

[0128] Figure 5 An internal schematic view of a power motor 30 is shown, Figure 6 for Figure 7 A partial schematic view of the power motor 30 is shown in

[0129] Referring to Figure 6 and Figure 6As shown, the core-winding assembly is arranged in the bracket assembly 31. Specifically, as shown in Figure 7 As shown, the bracket assembly 31 has a liquid cooling cavity 310a, and the stator core assembly 32 and the stator winding assembly 33 are arranged in the liquid cooling cavity 310a to realize the installation of the core-winding assembly in the bracket assembly 31. For example, the liquid cooling cavity 310a can be an annular cavity, so that each part of the stator core assembly 32 in the circumferential direction W can be arranged in the liquid cooling cavity 310a.

[0130] Since the stator winding assembly 33 is arranged in the liquid cooling cavity 310a, when the cooling medium flows into the liquid cooling cavity 310a, the heat of the coil winding 331 in the stator winding assembly 33 can be taken away to realize the heat dissipation of the coil winding 331.

[0131] Since the coil winding 331 is the heat source of the core-winding assembly, when the cooling medium flows into the liquid cooling cavity 310a to take away the heat of the coil winding 331, the heat dissipation of the core-winding assembly can be realized.

[0132] Figure 7 A partial internal schematic view of a power motor 30 is shown in Figure 8 , Figure 1 A partial internal schematic view of a power motor 30 is shown in Figure 9 .

[0133] Referring to Figure 2 and Figure 8 As shown, the bracket assembly 31 includes a stator bracket 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 bracket 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 bracket 311, and the first cover 312 is sealingly connected with the sleeve 314 and the stator bracket 311. The second cover 313 is connected to the other end of the sleeve 314 and the stator bracket 311, and the second cover 313 is sealingly connected with the sleeve 314 and the stator bracket 311.

[0134] The stator bracket 311, the sleeve 314, the first cover 312, and the second cover 313 are used to surround and form the liquid cooling cavity 310a to realize the installation of the core-winding assembly in the bracket assembly 31, and at the same time, the sealing property of the liquid cooling cavity 310a can be ensured.

[0135] Figure 9 A structure view of the power motor 30 provided by the embodiment of the present application from a second perspective is shown in Figure 10 A partial schematic view of the power motor 30 in Figure 11 Figure 10 ​The assembly effect of the stator core assembly 32 and the stator winding assembly 33 in the support assembly 31 can be seen from Figure 1 and Figure 10 .

[0136] Due to the arrangement of the first cover 312 and the second cover 313, when disassembling the core winding assembly, only the first cover 312 or the second cover 313 needs to be opened, and the disassembly of the core winding assembly in the support assembly 31 can be realized, so as to simplify the disassembly of the core winding assembly in the support assembly 31.

[0137] In some embodiments, the first cover 312 can be sealed and connected with the sleeve 314 and the stator support 311 in a manner of sealing ring, sealing glue, sealing glue combined with fastener, etc. For example, the fastener can be a rivet, etc. The sealing glue can be high-temperature-resistant high-strength epoxy structural glue. Similarly, the second cover 313 can also be sealed and connected with the sleeve 314 and the stator support 311 in a manner of sealing ring, sealing glue, sealing glue combined with fastener, etc.

[0138] Figure 11 The structure schematic diagram of the power motor 30 without the stator winding assembly 33 is shown in Figure 12 .

[0139] Referring to Figure 11 , in some embodiments, in addition to the stator core 321, the stator core 321 group also includes a core fixing ring 322. A plurality of stator cores 321 can be arranged in an array along the circumferential direction W (360°) of the core fixing ring 322. The stator core 321 can be fixed in the stator support 311 through the core fixing ring 322, so as 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 matched (same or similar) in structure with the groove 3221, and the protrusion 3211 can be embedded in the groove 3221, so as to realize the clamping connection between the stator core 321 and the core fixing ring 322. Figure 12 In this embodiment, the structure in which the stator core 321 is provided with the protrusion 3211 and the core fixing ring 322 is provided with the groove 3221 is shown.

[0141] For example, in this structure, a plurality of grooves 3221 can be arranged 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 , the core fixing ring 322 and the stator support 311 can also be connected in a manner 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 screws, bolts and the like fasteners.

[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 11 An internal schematic view of a stator support 311 is shown, Figure 13 An internal partial schematic view of a stator support 311 is shown, Figure 14 A partial schematic view of a support assembly 31 provided for 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 side of the stator core assembly 32 in the circumferential direction. Among them, the outer side of the stator core assembly 32 in the circumferential direction can be understood as the side of the stator core assembly 32 in the circumferential direction W facing the liquid cooling cavity 310a.

[0148] Figure 13 to Figure 15 A partial schematic view of a power motor 30 provided for embodiments of the present application is shown Figure 16 , Figure 2 A structural schematic view of a 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, the cooling medium can enter the liquid supply channel 34 through the liquid inlet channel 35 and flow in the liquid supply channel 34 along the circumferential direction W of the stator core assembly 32, and 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 be wrapped 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 of the coil winding 331 and the stator winding assembly 33.

[0150] Referring to Figure 17 and in combination with Figure 17As shown, 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.

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

[0152] Due to the presence 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 that will be released, and the smaller the flow rate 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 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. This can make the pressure drop of the cooling medium output by the liquid supply port 342 at the distal end of the liquid supply channel 34 smaller, so as to reduce the flow rate 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 close to the inlet of the liquid supply channel 34.

[0154] In this way, it is beneficial to improve the uniformity of the cooling medium output by the liquid supply port 342 on the liquid supply channel 34, 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 through the surface of the coil winding 331 comprehensively and uniformly, and carry away the heat of the coil winding 331. This can make the cooling (temperature) of each part of the stator winding assembly 33 more uniform, so as to fully dissipate heat from each part of the stator winding assembly 33, improve the heat dissipation effect of the stator winding assembly 33, and improve the working performance of the dynamoelectric machine 30. At the same time, since the stator winding assembly 33 is immersed in the cooling medium, the utilization rate of the cooling medium can also be improved.

[0155] In some examples, to ensure that 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, the flow area of the liquid supply port 342 can gradually increase from the direction close to the inlet of the liquid supply channel 34 to the direction far from the inlet of the liquid supply channel 34.

[0156] Alternatively, in some other examples, in the design of the liquid supply channel 34, only 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 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 15 As shown in the drawings, in some embodiments, the inlet of the liquid supply channel 34 can be located at the middle section of the liquid supply channel 34, and the flow channel walls on both sides of the inlet of the liquid supply channel 34 are provided with liquid supply ports 342. For example, the flow channel walls 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 the middle section, the cooling medium can flow in the liquid supply channel 34 in two different directions to the corresponding distal end of the liquid supply channel 34, 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 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 the drawings, 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 is provided with a plurality of liquid supply ports 342 spaced apart 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 ports 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 far 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 far away from the inlet of the liquid supply section 341.

[0162] For example, in some examples, for the same segment of the 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, 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] Referring to Figure 15 As shown, in addition to the liquid supply flow channel 34 and the liquid inlet flow channel 35, the bracket assembly 31 also has a bypass flow channel 36. The liquid supply flow channel 34, the liquid inlet flow channel 35 and the bypass flow channel 36 are located on the stator bracket 311 to realize the arrangement of the liquid supply flow channel 34, the liquid inlet flow channel 35 and the bypass flow channel 36 on the bracket assembly 31. At this time, the liquid supply port 342 is also arranged on the stator bracket 311.

[0164] The inlet of one of the at least two segments of the liquid supply section 341 is in communication with the outlet of the liquid inlet flow channel 35. The inlets of the remaining segments of the liquid supply section 341 are in communication with the bypass flow channel 36, and the inlet of the bypass flow channel 36 is in communication with the liquid inlet flow channel 35, so that the inlets of the remaining segments of the liquid supply section 341 are in communication with the liquid inlet flow channel 35 through the bypass flow channel 36. In this way, the cooling medium can enter the bypass flow channel 36 through the outlet of the liquid inlet flow channel 35 and enter the liquid supply section 341 in communication with the bypass flow channel 36 through the bypass flow channel 36.

[0165] By arranging the at least two segments of the liquid supply section 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 along the circumferential direction W of the stator core assembly 32, so as to realize the wrapping of the stator winding assembly 33 along the circumferential direction W and make the heat dissipation (temperature) of each part of the stator winding assembly 33 along the circumferential direction W more uniform.

[0166] Since the liquid inlet flow channel 35 is arranged at a position close to the edge of the circumferential direction W of the bracket assembly 31, when the at least two segments of the liquid supply section 341 are arranged along the circumferential direction W of the stator core assembly 32, some of the liquid supply sections 341 will be farther away from the outlet of the liquid inlet flow channel 35. If the at least two segments of the liquid supply section 341 are arranged along the circumferential direction W of the stator core assembly 32 and the adjacent two segments of the liquid supply section 341 are in communication with each other, the distal end of the liquid supply flow channel 34 will be farther away from the outlet of the liquid inlet flow channel 35, and the flow of the cooling medium output from the distal end of the liquid supply flow channel 34 will still be small.

[0167] In the present application, the bypass flow channel 36 is provided, when the cooling medium is output from the bypass flow channel 36 and the liquid supply section 341 in communication with the bypass flow channel 36 and enters the liquid cooling cavity 310a, the bypass flow channel 36 can supply liquid to the liquid supply section 341 at a position far from the outlet of the liquid inlet flow channel 35. Moreover, since the bypass flow 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 flow channel 35 to the inlet of the liquid supply section 341 through the bypass flow channel 36 can be reduced. This can further improve the uniformity of the flow of the cooling medium output by each liquid supply port 342 of the liquid supply flow channel 34, and further improve the uniformity of heat dissipation of the cooling medium to the stator winding assembly 33.

[0168] Referring to Figure 15 As shown in some embodiments, since the bypass flow channel 36 can reduce the pressure difference when the cooling medium flows from the outlet of the liquid inlet flow channel 35 to the inlet of the liquid supply section 341 through 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 can be improved.

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

[0170] Moreover, at this time, the number of liquid supply ports 342 on the liquid supply section 341 can not be limited, and the uniformity of heat dissipation of the cooling medium to the stator winding assembly 33 can also be improved. It should be noted that for this embodiment, when the liquid supply section 341 has multiple liquid supply ports 342, the arrangement and flow area design of the multiple liquid supply ports 342 can refer to the related description in the above.

[0171] The following will take the embodiment in which the bracket assembly 31 simultaneously has the liquid inlet flow channel 35, the bypass flow channel 36 and the liquid supply flow channel 34 (including at least two liquid supply sections 341) as an example to further describe the structure of the bracket assembly 31 and the power motor 30.

[0172] Figure 15 And Figure 18 Different views of the structure of the stator bracket 311 in the liquid supply section 341 and the liquid inlet flow channel 35 are shown.

[0173] Referring to Figure 19 And Figure 18As shown, at least two adjacent liquid supply sections 341 are arranged in a spaced manner along the circumferential direction W of the stator core assembly 32, so that the adjacent liquid supply sections 341 are not in communication along the circumferential direction W of the stator core assembly 32.

[0174] For example, the liquid supply flow channel 34 can be arranged in a disconnected manner between the adjacent liquid supply sections 341, so that the adjacent liquid supply sections 341 are spaced apart along the circumferential direction W of the stator core assembly 32.

[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 arranged to abut against the inner side of the flow channel wall of the liquid supply flow channel 34, so as to block the communication between the adjacent liquid supply sections 341 and separate the adjacent liquid supply sections 341.

[0176] Compared with the communication between the adjacent liquid supply sections 341, when the adjacent liquid supply sections 341 are not in communication along the circumferential direction W of the stator core assembly 32, the cooling medium in the adjacent liquid supply sections 341 can not affect each other, so as to ensure that the cooling medium can be output from the liquid supply port 342 of the liquid supply section 341, and enter the liquid cooling cavity 310a from the radial direction X of the stator core assembly 32 to cover and soak the core winding assembly, so as to ensure the uniformity of heat dissipation of each part of the core winding assembly. Meanwhile, when the adjacent liquid supply sections 341 are not in communication along the circumferential direction W of the stator core assembly 32, the flow control of the cooling medium output from the liquid supply port 342 of the adjacent liquid supply sections 341 is also 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 in communication with the outlet of the liquid inlet flow channel 35. The inlet of the second liquid supply section 341b is in communication with the bypass flow channel 36. That is, the liquid supply flow channel 34 includes the first liquid supply section 341a and the second liquid supply section 341b arranged 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 flow channel 35 respectively, and be output from the liquid supply port 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 in communication (directly in communication) with the outlet of the liquid inlet flow 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 in communication with the outlet of the liquid inlet flow channel 35 through the bypass flow channel 36, is referred to as the second liquid supply section 341b.

[0179] It should be noted that, Figure 19In some embodiments, the stent assembly 31 can have only one second liquid supply section 341b. For example, in some embodiments, the stent assembly 31 can have two, three, or more second liquid supply sections 341b.

[0180] In some embodiments, 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 flow channel 35 through a bypass flow channel 36.

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

[0182] When the liquid supply flow channel 34 includes the first liquid supply section 341a and a second liquid supply section 341b, the first liquid supply section 341a can be spaced apart from the second liquid supply section 341b along the circumferential direction W of the stator core assembly 32, or the inlet of the first liquid supply section 341a can be opposite to the inlet of the second liquid supply section 341b along the radial direction X of the stator core assembly 32. In this way, the liquid supply flow channel 34 can be uniformly arranged on the circumferential side of the core winding assembly. Through the bypass flow channel 36, the flow rate of the cooling medium flowing out of the liquid supply ports 342 at the positions closest and farthest from the outlet of the liquid inlet flow channel 35 can be more uniform, which is beneficial to improving the uniformity of the cooling medium flowing out of the liquid supply ports 342 spaced apart along the circumferential direction W of the stent assembly 31.

[0183] Reference Figure 18 As shown in FIG. 6, along the extension direction of the liquid supply section 341, the inlet of the liquid supply section 341 can be located at the middle section, and the flow channel walls on both sides of the inlet of the liquid supply section 341 have liquid supply ports 342. That is, along the extension direction of the first liquid supply section 341a, the inlet of the first liquid supply section 341a can be located at the middle section of the first liquid supply section 341a. Along the extension direction of the second liquid supply section 341b, the inlet of the second liquid supply section 341b can be located at the middle section of the second liquid supply section 341b.

[0184] By limiting the position of the inlet of the liquid supply section 341, when the cooling medium flows in the liquid supply section 341, the cooling medium can flow in two different directions in the liquid supply section 341 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. In this way, the flow rate of the cooling medium output by each liquid supply port 342 of the liquid supply section 341 can be more uniform, and the uniformity of the heat dissipation of the cooling medium to the stator winding assembly 33 can be further improved.

[0185] In some embodiments, when the first liquid supply section 341a can be arranged opposite to the second liquid supply section 341b along the radial direction X of the stator core assembly 32, the first baffle cover 312 can be arranged at one end of the stator support 311 where the first liquid supply section 341a is arranged, and the second baffle cover 313 can be arranged at the other end of the stator support 311 away from the first liquid supply section 341a. At this time, referring to Figure 18 As shown, the second baffle cover 313 can be provided with a liquid outlet 315, so that the coil winding 331 can flow through the coil winding assembly along 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 then the cooling medium can be output from the liquid outlet 315 after being cooled, so that the cooling medium can be reused after being cooled, 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 baffle cover 312. That is, the liquid outlet 315 can be arranged on the first baffle cover 312 or the second baffle cover 313.

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

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

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

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

[0191] The liquid inlet flow channel 35 and the liquid supply section 341 are in communication with each other, the outlet of the liquid inlet flow channel 35 communicates with the inlet of the first sub-flow guide flow channel 3721, and the outlet of the first sub-flow guide flow channel 3721 communicates with the inlet of the liquid supply section 341, so that the outlet of the liquid inlet flow channel 35 and the inlet of the first liquid supply section 341a are communicated through the first sub-flow guide flow channel 3721.

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

[0193] Referring to Figure 20 As shown, in some embodiments, the outlet of the liquid inlet flow channel 35 can include a first port 351 and a second port 352. In the liquid inlet flow channel 35 and the liquid supply section 341 that are in communication with each other, 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 flow channel 36 to achieve communication of the outlet of the liquid inlet flow channel 35 with the inlet of the first liquid supply section 341a and the inlet of the bypass flow channel 36, respectively.

[0194] Compared with the first liquid supply section 341a, due to the introduction of the bypass flow channel 36, the path of the cooling medium input by the outlet of the liquid inlet flow channel 35 into the second liquid supply section 341b is longer, and has a certain flow resistance during flow, which can cause the flow rate of the cooling medium entering 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 rate of the cooling medium output by the liquid supply port 342 of the second liquid supply section 341b to be smaller than the flow rate 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 rate of the cooling medium input by the outlet of the liquid inlet flow channel 35 into the bypass flow channel 36 is larger, thereby overcoming the resistance during flow in the bypass flow channel 36, and reducing the difference between the flow rate of the cooling medium output by the liquid supply port 342 of the second liquid supply section 341b and the flow rate of the cooling medium output by the liquid supply port 342 of the first liquid supply section 341a, so that the flow rate of the cooling medium output by the liquid supply port 342 of the second liquid supply section 341b and the flow rate 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 is 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 liquid inlet channel 35 can also be greater than or equal to the flow area of the first port 351, and the bypass channel 36 and the liquid supply section 341 (the second liquid supply section 341b) in communication with the bypass channel 36 can also have a flow area 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 20 As shown in some embodiments, the bypass channel 36 can extend along the circumferential direction W of the stator core assembly 32, and the bypass channel 36 and the liquid supply channel 34 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 channel 36 can be arranged on the side of the stator support 311 facing the second cover 313.

[0198] By limiting the extension direction of the bypass channel 36 and the arrangement position of the bypass channel 36 relative to the liquid supply channel 34, on the basis of ensuring that the bypass channel 36 guides the inlet of the second liquid supply section 341b and the outlet of the liquid inlet channel 35, compared with the way of arranging the bypass channel 36 to bend along the circumferential direction W of the stator core assembly 32, the length of the bypass 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 ports 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 channel 36 and the arrangement position of the bypass channel 36 relative to the liquid supply channel 34, the arrangement of the bypass 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 channel 36 is shown.

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

[0202] Referring to Figure 21As shown, in the liquid supply section 341 (the second liquid supply section 341b) of the communication bypass flow channel 36, the liquid supply section 341 includes a first sub-section 3411 and a second sub-section 3412 distributed along the circumferential direction W of the stator core assembly 32. The flow direction of the cooling medium in the first sub-section 3411 is opposite to that in the bypass flow channel 36, and the flow direction of the cooling medium in the second sub-section 3412 is the same as that in the bypass flow channel 36. The cooling medium output by the outlet of the bypass flow channel 36 can be output from the stator core assembly 32 at different radial directions X via the liquid supply ports 342 on the first sub-section 3411 and the second sub-section 3412, so that the liquid supply section 341 of the communication bypass flow channel 36 can supply liquid from the middle section. On 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 in communication with one end of the first sub-section 3411 close to the second sub-section 3412 and one end of the second sub-section 3412 close to the first sub-section 3411 through the second sub-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 uniform with the flow of the cooling medium flowing into the second sub-section 3412. 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 for 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 in communication with the bypass flow channel 36 through the first sub-flow guide section 3723. The second sub-section 3412 is in communication 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 respectively communicate the outlet of the bypass flow channel 36 with the first sub-section 3411 and the second sub-section 3412.

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

[0206] The flow area of the first sub-flow guide section 3723 can be greater than the flow area of the second sub-flow guide section 3724. Alternatively, the flow area of the first sub-flow guide section 3723 can be equal to the flow area of the second sub-flow 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 passage 36, after the cooling medium flows out of the bypass passage 36, it can more easily enter the second sub-section 3412 through the second sub-flow guide section 3724. When the flow area of the first sub-flow guide section 3723 is equal to the flow area of the second sub-flow 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-flow guide section 3723 is equal to the flow area of the second sub-flow guide section 3724, when the flow area of the first sub-flow guide section 3723 is greater than the flow area of the second sub-flow 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 rates of the cooling medium output by the liquid supply outlets 342 of the first sub-section 3411 and the second sub-section 3412 are relatively uniform.

[0208] Referring to Figure 21 As shown, the bracket assembly 31 also has a liquid outlet 315 in communication with the liquid cooling cavity 310a, so that after the cooling medium cools 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 is cooled, it can again enter the liquid cooling cavity 310a through the liquid inlet passage 35, to circulate and cool the stator winding assembly 33, improving the utilization rate of the cooling medium.

[0209] In some examples, the bracket assembly 31 can be provided with a plurality of liquid outlets 315, which can be distributed at different positions of the stator bracket 311, so that the cooling medium can be quickly cooled after taking away the heat of the coil winding 331, improving the utilization rate of the cooling medium.

[0210] It should be noted that the bracket assembly 31 in the above embodiment can make the cooling medium in the liquid supply channel 34 enter the liquid cooling cavity 310a along the circumferential direction W of the stator winding assembly 33 through the liquid supply channel 34, so as to sufficiently cool the coil winding 331, thereby improving the working performance of the power motor 30.

[0211] In the related art, the heat dissipation of the stator winding assembly is not uniform in the axial direction of the stator core assembly.

[0212] In some examples, the bracket assembly 31 can also be designed in different structures to solve the problem of uneven heat dissipation of the stator winding assembly 33 in the axial direction of the stator core assembly 32, and the coil winding 331 in the stator winding assembly 33 can also be sufficiently cooled, thereby improving the working performance of the power motor 30.

[0213] Figure 19 And Figure 22 Two different structure diagrams of the communication flow channel 38 of the stator are shown. Figure 23 A structure diagram of a spraying structure 39 in the power motor 30 is shown.

[0214] The differences between the bracket assembly 31 and the above embodiments will be further described below in combination with Figure 24 , Figure 8 , and specific examples.

[0215] Referring to Figure 19 to Figure 24 In some examples, the cavity wall of the liquid cooling cavity 310a has a liquid outlet 315 and at least two liquid supply openings 342. The at least two liquid supply openings 342 are arranged at intervals in the axial direction Z of the stator core assembly 32. The liquid supply openings 342 are used for supplying the cooling medium to flow into the liquid cooling cavity 310a. The liquid outlet 315 is used for the cooling medium in the liquid cooling cavity 310a to flow out.

[0216] By arranging the at least two liquid supply ports 342 in the axial direction Z of the stator core assembly 32, the cooling medium output by the liquid inlet channel 35 can be output along the axial direction Z of the stator winding assembly 33 via the at least two liquid supply ports 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, 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 in the axial direction Z of the stator core assembly 32, to improve the heat dissipation uniformity of the stator winding assembly 33 in the axial direction Z of the stator core assembly 32, thereby improving the working performance of the power motor 30.

[0217] Referring to Figure 8 As shown, in some embodiments, the cavity wall of the liquid cooling cavity 310a can also have at least one liquid supply port 342. The liquid cooling cavity 310a is provided with a communication channel 38. The at least one liquid supply port 342 communicates with the communication channel 38. In this way, when the stator core assembly 32 and other components block the liquid supply port 342 and affect the output of the cooling medium by the liquid supply port 342, the liquid supply port 342 can input the cooling medium into the liquid cooling cavity 310a through the communication channel 38, to achieve uniform heat dissipation of the stator winding assembly 33, thereby improving the working performance of the power motor 30.

[0218] When the liquid supply port 342 is at least one or at least two, it includes a first liquid supply port 3421. The stator core assembly 32 includes a first end 32a and a second end 32b, and the first end 32a and the second end 32b are located at the two ends of the axial direction Z of the stator core assembly 32. 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.

[0219] 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, to enhance the uniformity of the temperature of the liquid cooling cavity 310a in the axial direction Z of the stator winding assembly 33, and to dissipate heat from the area close to the bottom of the coil winding 331 and the stator winding assembly 33.

[0220] It should be noted that the area close to the bottom of the stator winding assembly 33 can be understood as the area adjacent to the first end 32a of the stator winding assembly 33.

[0221] The first liquid supply port 3421 is in communication with the communication flow channel 38. 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 of the stator core assembly 32, it may be blocked by the stator core assembly 32. The embodiments of the present application can avoid the stator core assembly 32 from blocking the first liquid supply port 3421 by the communication communication, so that the cooling medium can easily enter the liquid cooling cavity 310a to cool the coil winding 331.

[0222] Referring to Figure 22 As shown in the drawings, in some embodiments, the stator core assembly 32 has a first spacing space 310b between the end of the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a in the axial direction Z. For example, the first end 32a of the stator core assembly 32 has a first spacing space 310b between the first end 32a and the cavity wall of the liquid cooling cavity 310a.

[0223] 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 through the first spacing space 310b, and finally output the liquid cooling cavity 310a from the liquid outlet 315, realizing the heat dissipation of the coil winding 331.

[0224] Referring to Figure 22 As shown in the drawings, when the stator core assembly 32 has a first spacing space 310b between the end of the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a, in some examples, the stator core assembly 32 includes a first surface. The first surface of the stator core assembly 32 is opposite to the cavity wall of the liquid cooling cavity 310a provided with the liquid supply port 342. The first surface of the stator core assembly 32 has a first groove 32c. The first groove 32c and the cavity wall of the liquid cooling cavity 310a provided with the liquid supply port 342 surround to form the communication flow channel 38. For example, the first groove 32c and the cavity wall of the liquid cooling cavity 310a provided with the first liquid supply port 3421 surround to form the communication flow channel 38.

[0225] 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 can be 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, after the cooling medium flows in the communication flow channel 38 and absorbs the heat of the coil winding 331, it can enter the first spacing space 310b and output the liquid cooling cavity 310a from the liquid outlet 315.

[0226] At the same time, the cooling medium can flow in the communication flow channel 38 and heat exchange with the stator core assembly 32 and the coil winding 331 arranged on the stator core assembly 32 for a long path, and then enter the first interval space 310b, so that the coil winding 331 can be fully cooled, the heat dissipation effect of the coil winding 331 is improved, and the utilization rate of the cooling medium is also improved.

[0227] Referring to Figure 22 As shown in the first interval space 310b between the end of the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a, in other examples, the liquid cooling cavity 310a has a second groove 3111 in the cavity wall where the liquid inlet 342 is arranged. The second groove 3111 and the stator core assembly 32 form a communication flow channel 38, and the groove wall of the second groove 3111 has a liquid inlet 342. In the axial direction Z of the stator core assembly 32, one end of the second groove 3111 is located between the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a, so that the groove cavity of the second groove 3111 communicates with the first interval space 310b.

[0228] For example, the liquid cooling cavity 310a has a second groove 3111 in the cavity wall where the first liquid inlet 3421 is arranged, and the first liquid inlet 3421 is located in 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 communicates with the first interval space 310b.

[0229] The position of the second groove 3111 is limited, so that the groove cavity of the second groove 3111 communicates with the first interval space 310b, thereby realizing the communication between the communication flow channel 38 and the first interval space 310b. In this way, the cooling medium flowing in the communication flow channel 38 can also absorb the heat of the coil winding 331, and then be output from the liquid cooling cavity 310a through the first interval space 310b and the liquid outlet 315.

[0230] At the same time, the cooling medium can flow in the communication flow channel 38 and heat exchange with the stator core assembly 32 and the coil winding 331 arranged on the stator core assembly 32 for a long path, and then enter the first interval space 310b, so that the coil winding 331 can be fully cooled, the heat dissipation effect of the coil winding 331 is improved, and the utilization rate of the cooling medium is also improved. The reasons can be referred to the related description of the first groove 32c above, which will not be repeated here.

[0231] Referring to Figure 22As shown, in some embodiments, the stator core assembly 32 has a through hole, which forms a through flow channel 38. Through the provision of the through hole, the communication between the liquid supply port 342 and the liquid cooling cavity 310a is also achieved, so that the cooling medium can enter the through hole when output through the liquid supply port 342, enter the liquid cooling cavity 310a, and fully contact and dissipate heat with the coil winding 331.

[0232] 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 can also be referred to as the direction X in the radial direction.

[0233] Referring to Figure 23 As 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 with 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 efficiently dissipate heat from the coil winding 331.

[0234] Next, taking the bracket assembly 31 having at least two liquid supply ports 342 as an example, the differences between the bracket assembly 31 and the above embodiments are further described.

[0235] 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.

[0236] 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.

[0237] 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 spraying structure 39 on the cavity wall of the liquid cooling cavity 310a. In the axial direction Z of the stator core assembly 32, the spraying structure 39 is located close to the second end 32b of the stator core assembly 32. For example, the spraying 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 spraying structure 39, and the spraying openings of the spraying structure 39 are in communication with the liquid cooling cavity 310a, and the spraying openings of the spraying structure 39 are configured to spray in the direction of the stator core assembly 32. In this way, the cooling medium entering the spraying structure 39 can be sprayed onto the coil winding 331 wound on the stator core assembly 32 through the plurality of spraying 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.

[0238] 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 spraying structure 39 can be provided on the first cover 312 so that the spraying structure 39 is in communication with the second liquid supply port 3422. For example, the spraying structure 39 can be a spraying flow channel in the first cover 312, and the flow channel wall of the spraying flow channel is provided with a plurality of spraying openings. The plurality of spraying openings can be provided on the flow channel wall of the spraying flow channel in the radial direction X of the stator core assembly 32 to ensure that the cooling medium output through the plurality of spraying openings can be sprayed in the direction of the stator core assembly 32 in the radial direction X of the stator core assembly 32.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] 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, improving the uniformity of heat dissipation from the coil winding 331 in the axial direction Z of the stator core assembly 32, while further improving the utilization rate of the cooling medium.

[0243] 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, affecting the utilization rate of the cooling medium.

[0244] 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.

[0245] 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.

[0246] 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.

[0247] As shown in 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.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] Figure 2 and Figure 25 The structure schematic diagrams of the liquid pump 60 at different viewing angles are shown.

[0263] 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.

[0264] 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.

[0265] 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 machine (30) characterized by, The stator comprises a bracket assembly (31), a stator core assembly (32), and a stator winding assembly (33) wound on the stator core assembly (32), the bracket assembly (31) has a liquid cooling cavity (310a), and the stator core assembly (32) and the stator winding assembly (33) are arranged in the liquid cooling cavity (310a); The cavity wall of the liquid cooling cavity (310a) has a liquid outlet (315) and at least one liquid inlet (342); The liquid cooling cavity (310a) is provided with a communication flow channel (38), at least one liquid inlet (342) 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); The liquid inlet (342) is used for flowing cooling medium into the liquid cooling cavity (310a), and the liquid outlet (315) is used for flowing the cooling medium in the liquid cooling cavity (310a) out. In the axial direction of the stator core assembly (32), a 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); 2. The power machine (30) of claim 1, characterized in that The liquid outlet (315) is in communication with the first spacing space (310b), and the first spacing space (310b) is in communication with the communication flow channel (38). The stator core assembly (32) comprises a first surface; 3. The power machine (30) of claim 2, characterized by The first surface has a first groove (32c), the first groove (32c) and the cavity wall of the liquid cooling cavity (310a) provided with the liquid inlet (342) form the communication flow channel (38), and the first groove (32c) penetrates the end of the stator core assembly (32), so that the groove cavity of the first groove (32c) is in communication with the first spacing space (310b). The liquid cooling cavity (310a) has a second groove (3111) in the cavity wall provided with the liquid inlet (342), the second groove (3111) and the stator core assembly (32) form the communication flow channel (38), and the groove wall of the second groove (3111) has the liquid inlet (342); 4. The power machine (30) of claim 2, characterized in that, In the axial direction of the stator core assembly (32), one end of the second groove (3111) is located between the stator core assembly (32) and the cavity wall of the liquid cooling cavity (310a), so that the groove cavity of the second groove (3111) is in communication with the first spacing space (310b). The stator core assembly (32) has a communication hole forming the communication flow channel (38); 5. The power machine (30) of claim 2, characterized by The stator core assembly (32) comprises a core fixing ring; ​ The iron core fixing ring comprises a first surface and a second surface, the first surface and the second surface are respectively located on two sides of the iron core fixing ring in the radial direction, the communication hole penetrates through the first surface and the second surface, the first surface is opposite to the cavity wall of the liquid cooling cavity (310a) provided with the liquid supply port (342), the second surface has a second spacing space (310c) with the cavity wall of the liquid cooling cavity (310a), the communication hole is located at one end of the second surface and communicates with the second spacing space (310c), and the second spacing space (310c) communicates with the liquid outlet (315).

6. The electric motor (30) according to any one of claims 1-5, characterized in that The at least one liquid supply port (342) comprises a first liquid supply port (3421); The stator core assembly (32) comprises a first end (32a) and a second end (32b), the first end (32a) and the second end (32b) are respectively located at two ends of the stator core assembly (32) in the axial direction; In the axial direction of the stator core assembly (32), the first liquid supply port (3421) is located between the first end (32a) and the second end (32b).

7. The power machine (30) of any of claims 1-5, characterized by, The cavity wall of the liquid cooling cavity (310a) has at least two liquid supply ports (342); In the axial direction of the stator core assembly (32), at least two liquid supply ports (342) are arranged at intervals.

8. The power machine (30) of claim 7, characterized by The at least two liquid supply ports (342) comprise a second liquid supply port (3422); The stator core assembly (32) comprises a first end (32a) and a second end (32b), the first end (32a) and the second end (32b) are respectively located at two ends of the stator core assembly (32) in the axial direction; In the axial direction of the stator core assembly (32), the second liquid supply port (3422) is located on the side away from the first end (32a) of the second end (32b).

9. The power machine (30) of claim 7, characterized by The at least two liquid supply ports (342) comprise a second liquid supply port (3422); The stator core assembly (32) comprises a first end (32a) and a second end (32b), the first end (32a) and the second end (32b) are respectively located at two ends of the stator core assembly (32) in the axial direction, and a spraying structure (39) is arranged in the liquid cooling cavity (310a); In the axial direction of the stator core assembly (32), the spraying structure (39) is located on the side away from the first end (32a) of the second end (32b); The second liquid supply port (3422) communicates with the spraying structure (39), a spraying port of the spraying structure (39) communicates with the liquid cooling cavity (310a), and the spraying port of the spraying structure (39) is used for spraying towards the direction of the stator core assembly (32).

10. The power machine (30) of claim 7, characterized by The at least two liquid supply ports (342) comprise a first liquid supply port (3421) and a second liquid supply port (3422); The first liquid supply port (3421) and the second liquid supply port (3422) are arranged at intervals in the axial direction of the stator core assembly (32), 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); the flow area of the first liquid supply port (3421) is smaller than that of the second liquid supply port (3422).

11. The power machine (30) of any of claims 1-5, characterized in that, The bracket assembly (31) comprises a stator bracket (311), a first cover (312), a second cover (313), and a sleeve (314); The stator core assembly (32) is sleeved on the radially outer side of the stator bracket (311), and the sleeve (314) is sleeved on the radially outer side of the stator core assembly (32); The first cover (312) is connected to one end of the sleeve (314) and the stator bracket (311), and the first cover (312) is in sealed connection with the sleeve (314) and the stator bracket (311); The second cover (313) is connected to the other end of the sleeve (314) and the stator bracket (311), and the second cover (313) is in sealed connection with the sleeve (314) and the stator bracket (311); The stator bracket (311), the sleeve (314), the first cover (312), and the second cover (313) are used to form the liquid cooling cavity (310a), the liquid supply port (342) is located on the stator bracket (311), and the liquid outlet (315) is located on the first cover (312) or the second cover (313).

12. An electric motor (21) characterized by, The power motor (30) according to any one of claims 1-11, and a heat sink (40); The liquid outlet (315) of the power motor (30) is in communication with the inlet of the heat sink (40), and the liquid supply port (342) of the power motor (30) is in communication with the outlet of the heat sink (40).

13. An electric propulsion device (20) characterized by The electric motor (21) according to claim 12, and a propeller (22); The electric motor (21) is in driving connection with the propeller (22).

14. An aircraft characterized by, The aircraft (10) according to claim 13, and an electric propulsion device (20); The electric propulsion device (20) is arranged on the wing (12), and / or the fuselage (11), and / or the tail (13). The aircraft (10) according to claim 13, and an electric propulsion device (20);

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