Power motor, electric engine, electric propulsion device and aircraft

Abstract

The present application provides a power motor, an electric engine, an electric propulsion device and an aircraft, and relates to the field of aircraft technology. The stator core assembly and the stator winding assembly of the power motor are arranged in the liquid cooling cavity of the bracket assembly. The bracket assembly has a liquid supply channel, a bypass channel and a liquid inlet channel. The liquid supply channel includes at least two liquid supply sections distributed along the circumference of the stator core assembly, and the liquid supply section is connected to the liquid cooling cavity. The inlet of one of the at least two liquid supply sections is connected to the outlet of the liquid inlet channel, and the inlet of the remaining liquid supply section of the at least two liquid supply sections is connected to the bypass channel, and the inlet of the bypass channel is connected to the liquid inlet channel. In this way, the cooling medium is input into the liquid cooling cavity from different positions of the circumference of the stator core assembly. Through the setting of the bypass channel, the uniformity of the flow rate of the cooling medium output from each liquid supply port of the liquid supply channel can be improved, and the uniformity of the heat dissipation of the stator winding assembly by the cooling medium can be improved, so as to improve the working performance of the power motor.

Description

Technical Field

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

[0002] An electric vertical take-off and landing (eVTOL) aircraft includes an electric propulsion device, which includes a propeller and an electric engine. The electric engine includes a power motor, which is connected to the propeller and is used to drive the propeller to rotate. The power motor is a high-power heat-generating motion device. During the operation of the power motor, the heat generated by the power motor accumulates continuously as the working time increases, causing the temperature inside the power motor to gradually increase, thereby reducing the working performance of the power motor.

[0003] Currently, in the relevant fields, for high-power heat-generating moving devices, such as the drive motors of new energy vehicles, the drive motors are usually provided with heat dissipation channels, and the cooling medium passing through the heat dissipation channels indirectly exchanges heat with the stator housing and stator windings of the stator, so as to keep the temperature of the drive motor within a reasonable range.

[0004] However, in order to meet the requirements of weight and layout space, electric vertical take-off and landing aircraft usually require the design of components to be small and precise, while ensuring the performance. If the heat dissipation flow channel in the related field is used to dissipate heat from the power motor, the electric engine will be larger in size and cannot meet the heat dissipation requirements of the power motor.

[0005] In the related art, the power motor has uneven supply of cooling medium for dissipating heat of the stator winding assembly, which leads to uneven heat dissipation of the stator winding assembly and poor heat dissipation of the stator winding assembly.

[0006] Therefore, how to achieve miniaturization of the power motor while making the heat dissipation of the stator winding assembly more uniform has become an urgent problem to be solved in the field of aircraft design. Summary of the invention

[0007] The present application aims to provide a power motor, an electric engine, an electric propulsion device and an aircraft, which can improve the uniformity of heat dissipation of a stator winding assembly in a power motor by a cooling medium, so as to improve the working performance of the power motor, so as to achieve miniaturization of the power motor while making the heat dissipation of the stator winding assembly more uniform.

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

[0009] The stator comprises a support assembly, a stator core assembly and a stator winding assembly wound on the stator core assembly, the support assembly has a liquid cooling cavity, and the stator core assembly and the stator winding assembly are arranged in the liquid cooling cavity;

[0010] The support assembly also has a liquid supply channel, a bypass channel and a liquid inlet channel;

[0011] The liquid supply channel includes at least two liquid supply sections distributed along the circumference of the stator core assembly, and the liquid supply sections are connected to the liquid cooling cavity;

[0012] The inlet of one of the at least two liquid supply sections is connected to the outlet of the liquid inlet channel, the inlet of the other of the at least two liquid supply sections is connected to the bypass channel, and the inlet of the bypass channel is connected to the liquid inlet channel;

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

[0014] The electric motor provided by the embodiment of the present application can realize that the cooling medium is input into the liquid cooling cavity from different circumferential positions of the stator core assembly through at least two liquid supply sections distributed along the circumference of the stator core assembly, so as to realize the circumferential coating of the stator winding assembly, so as to make the heat dissipation of each part of the stator winding assembly in the circumferential direction more uniform. In addition, since the bypass flow channel is not provided with a liquid supply port, the bypass flow channel can supply liquid to the liquid supply section at a position far from the outlet of the liquid inlet flow channel, and can also reduce the pressure difference when the cooling medium flows from the outlet of the liquid inlet channel to the inlet of the liquid supply section through the bypass flow channel. In this way, the uniformity of the flow rate of the cooling medium outputted from each liquid supply port of the liquid supply flow channel can be improved, and the uniformity of the heat dissipation of the stator winding assembly by the cooling medium can be improved, so as to improve the working performance of the power motor.

[0015] In some possible implementations, the liquid supply section extends circumferentially along the outer side of the stator core assembly, the flow channel wall of the liquid supply section has a plurality of liquid supply ports spaced apart along the extension direction of the liquid supply section, and the liquid supply section is connected to the liquid cooling cavity through the liquid supply ports.

[0016] In some possible implementations, in the same liquid supply section, the flow area of ​​the liquid supply port gradually increases in a direction from the inlet close to the liquid supply section to the inlet far from the liquid supply section.

[0017] In some possible implementations, in the extension direction of the liquid supply section, the inlet of the liquid supply section is located in the middle of the liquid supply section, and the liquid supply section is provided with liquid supply ports on the flow channel walls on both sides of the inlet of the liquid supply section.

[0018] In some possible implementations, in the radial direction of the stator core assembly, the liquid inlet channel is located on a side of the liquid supply channel and the bypass channel away from the liquid cooling chamber;

[0019] The opening direction of the outlet of the liquid inlet channel is along the radial direction of the stator core assembly and faces the liquid cooling cavity.

[0020] In some possible implementations, in the extension direction of the liquid supply channel, at least two adjacent liquid supply sections are separated and arranged.

[0021] In some possible implementations, the support assembly further comprises a first sub-flow guiding channel, and the first sub-flow guiding channel extends along the axial direction of the stator core assembly;

[0022] For the liquid supply section whose inlet is connected to the outlet of the liquid inlet channel: the outlet of the liquid inlet channel is connected to the inlet of the first sub-diversion channel, and the outlet of the first sub-diversion channel is connected to the inlet of the liquid supply section.

[0023] In some possible implementations, the bypass flow channel extends circumferentially along the outer side of the stator core assembly, and the bypass flow channel and the liquid supply flow channel are arranged in sequence along the axial direction of the stator core assembly.

[0024] In some possible implementations, the outlet of the bypass flow channel and the inlet of the bypass flow channel are respectively located at two ends of the extension direction of the bypass flow channel;

[0025] In the liquid supply section connected to the bypass flow channel, the liquid supply section includes a first subsection and a second subsection distributed along the circumferential direction of the stator core assembly;

[0026] The bracket assembly also has a second sub-guiding flow channel, and the outlet of the bypass flow channel is connected to an end of the first sub-segment close to the second sub-segment and an end of the second sub-segment close to the first sub-segment through the second sub-guiding flow channel. The second sub-guiding flow channel is used to make the flow rate of the cooling medium flowing into the first sub-segment and the flow rate of the cooling medium flowing into the second sub-segment uniform.

[0027] In some possible implementations, the flow direction of the cooling medium in the first sub-segment is opposite to the flow direction of the cooling medium in the bypass flow channel, and the flow direction of the cooling medium in the second sub-segment is the same as the flow direction of the cooling medium in the bypass flow channel;

[0028] The second sub-flow guiding channel includes a first sub-flow guiding section and a second sub-flow guiding section;

[0029] The first subsection is connected to the bypass flow channel through the first sub-flow guiding section, and the second subsection is connected to the bypass flow channel through the second sub-flow guiding section. The flow area of ​​the first sub-flow guiding section is greater than the flow area of ​​the second sub-flow guiding section.

[0030] In some possible implementations, the liquid inlet channel includes a first port and a second port;

[0031] For a liquid supply section whose inlet is connected to the outlet of the liquid inlet channel: the first port is connected to the inlet of the liquid supply section;

[0032] The second port is communicated with the inlet of the bypass flow channel;

[0033] The flow area of ​​the first port is smaller than the flow area of ​​the second port;

[0034] The flow area of ​​the liquid supply section connected to the inlet and the outlet of the liquid inlet channel is greater than or equal to the flow area of ​​the first port, and / or the flow area of ​​the bypass channel and the liquid supply section connected to the bypass channel is greater than or equal to the flow area of ​​the second port.

[0035] In some possible implementations, the at least two liquid supply sections include a first liquid supply section and a second liquid supply section;

[0036] The inlet of the first liquid supply section is connected to the outlet of the liquid inlet channel, and the inlet of the second liquid supply section is connected to the bypass channel;

[0037] The first liquid supply section and the second liquid supply section are arranged opposite to each other along the radial direction of the stator core assembly; and / or,

[0038] The inlet of the first liquid supply section and the inlet of the second liquid supply section are arranged opposite to each other along the radial direction of the stator core assembly.

[0039] In some possible implementations, the bracket assembly includes a stator bracket, a first stop cover, a second stop cover, and a sleeve;

[0040] The stator core assembly is sleeved on the radial outer side of the stator bracket, and the sleeve is sleeved on the radial outer side of the stator core assembly;

[0041] The first stop cover is connected to one end of the sleeve and the stator bracket, and the first stop cover is sealedly connected to the sleeve and the stator bracket;

[0042] The second stop cover is connected to the other end of the sleeve and the stator bracket, and the second stop cover is sealedly connected to the sleeve and the stator bracket;

[0043] The stator support, the sleeve, the first stop cover and the second stop cover are used to enclose and form a liquid cooling cavity. The liquid supply channel, the liquid inlet channel and the bypass channel are located on the stator support.

[0044] A second aspect of an embodiment of the present application provides an electric engine, the electric engine comprising a radiator and a power motor as described in any one of the above items;

[0045] The liquid cooling chamber of the power motor is communicated with the inlet of the radiator, and the outlet of the radiator is communicated with the inlet of the liquid inlet channel of the power motor.

[0046] A third aspect of the embodiments of the present application provides an electric propulsion device, the electric propulsion device comprising a propeller and the electric engine as described above;

[0047] The electric motor is drivingly connected to the propeller.

[0048] A fourth aspect of the embodiments of the present application provides an aircraft, an aircraft comprising a fuselage, wings, a tail wing, and the above electric propulsion device;

[0049] The electric propulsion device is arranged on the wing, and / or the fuselage, and / or the tail. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0051] Figure 1 A schematic diagram of the structure of an aircraft provided in an embodiment of the present application;

[0052] Figure 2 A schematic diagram of the structure of an electric engine provided in an embodiment of the present application;

[0053] Figure 3 A schematic diagram of the structure of a power motor provided in an embodiment of the present application at a first viewing angle;

[0054] Figure 4 An exploded diagram of a power motor provided in an embodiment of the present application;

[0055] Figure 5 A partial schematic diagram of a stator winding assembly provided in an embodiment of the present application;

[0056] Figure 6 An internal schematic diagram of a power motor provided in an embodiment of the present application;

[0057] Figure 7 for Figure 6 A partial schematic diagram of the medium power motor;

[0058] Figure 8 A partial internal schematic diagram of a power motor provided in an embodiment of the present application Figure 1 ;

[0059] Fig. 9 A partial internal schematic diagram of a power motor provided in an embodiment of the present application Figure 2 ;

[0060] Fig.10 A structural diagram of a power motor provided in an embodiment of the present application at a second viewing angle;

[0061] Fig.11 for Fig.10 Partial diagram of a medium power motor Figure 1 ;

[0062] Fig.12 for Fig.11 A schematic diagram of the structure of a medium power motor without the stator winding assembly;

[0063] Fig.13 An internal schematic diagram of a stator bracket provided in an embodiment of the present application;

[0064] Fig.14 A partial internal schematic diagram of a stator bracket provided in an embodiment of the present application;

[0065] Fig.15 A partial schematic diagram of a bracket assembly provided in an embodiment of the present application;

[0066] Fig.16 A partial schematic diagram of a power motor provided in an embodiment of the present application Figure 2 ;

[0067] Fig.17 A schematic structural diagram of a stator bracket provided in an embodiment of the present application;

[0068] Fig.18 A schematic diagram of a partial structure of a stator support provided in an embodiment of the present application Figure 1 ;

[0069] Fig.19 A schematic diagram of a partial structure of a stator support provided in an embodiment of the present application Figure 2 ;

[0070] Fig. 20 A partial schematic diagram of a stator bracket on one side of a liquid inlet channel provided in an embodiment of the present application;

[0071] Fig.21 A schematic structural diagram of a stator support at an outlet of a bypass flow channel provided in an embodiment of the present application;

[0072] Fig. 22 A schematic diagram of the structure of a stator in a communicating flow channel provided in an embodiment of the present application;

[0073] Fig.23 A schematic diagram of the structure of another stator in a communicating flow channel provided in an embodiment of the present application;

[0074] Fig.24 A schematic diagram of a spray structure inside a power motor provided in an embodiment of the present application;

[0075] Fig.25 A schematic diagram of the structure of a liquid pump provided in an embodiment of the present application at a first viewing angle;

[0076] Fig.26A schematic structural diagram of a liquid pump provided in an embodiment of the present application at a second viewing angle.

[0077] Reference numerals:

[0078] 11. Fuselage; 12. Wings; 13. Tail; 14. Arms; 15. Nacelle;

[0079] 20. Electric propulsion device; 20a. Fixed electric propulsion device; 20b. Tilting electric propulsion device; 21. Electric engine; 22. Propeller;

[0080] 30. Power motor;

[0081] 31, bracket assembly; 310a, liquid cooling chamber; 310b, first spacing space; 310c, second spacing space; 311, stator bracket; 3111, second groove; 312, first stop cover; 313, second stop cover; 314, sleeve; 315, liquid outlet;

[0082] 32, stator core assembly; 32a, first end; 32b, second end; 32c, first groove; 321, stator core; 3211, protrusion; 322, core fixing ring; 3221, groove;

[0083] 33. stator winding assembly; 331. coil winding; 332. insulating paper;

[0084] 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 subsection; 3412, second subsection; 342, liquid supply port; 3421, first liquid supply port; 3422, second liquid supply port;

[0085] 35, liquid inlet channel; 351, first port; 352, second port;

[0086] 36. Bypass flow channel;

[0087] 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 segment; 3714, fourth sub-flow guide segment; 372, second flow guide channel; 3721, first sub-flow guide channel; 3722, second sub-flow guide channel; 3723, first sub-flow guide segment; 3724, second sub-flow guide segment; 373, liquid separation channel;

[0088] 38. Connecting flow channel;

[0089] 39. Spray structure;

[0090] 40. Radiator;

[0091] 50. Fan;

[0092] 60. Liquid pump; 61. Medium inlet; 62. Medium outlet. DETAILED DESCRIPTION

[0093] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0094] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0095] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be a connection between two elements or an interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0096] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0097] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0098] Figure 1 A schematic diagram of the structure of an aircraft is shown. Figure 1 As shown, an embodiment of the present application provides an aircraft. For example, the aircraft can be Figure 1 The electric vertical take-off and landing (eVTOL) aircraft shown in FIG. However, it should be noted that Figure 1 It is only a structural illustration of an aircraft and does not constitute a limitation on the structure of the aircraft.

[0099] Combined with the following Figure 1 , describe the structure of the aircraft.

[0100] See also Figure 1 As shown, 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 an existing aircraft. The wings 12 are fixedly connected to the fuselage 11 and extend along both sides of the fuselage 11. The wings 12 on both sides are symmetrically arranged relative to the symmetric 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 repeated here.

[0101] It should be noted that, in some embodiments, in addition to the fuselage 11 and the wings 12, the aircraft may further include a tail 13. The tail 13 is fixedly disposed at the tail of the fuselage 11, and the tail 13 is integrally formed with the fuselage 11 or mechanically connected, and is symmetrical relative to the symmetric plane of the fuselage 11. The structure of the tail 13 may also refer to the tail structure of an existing aircraft, and will not be described in detail here.

[0102] See also Figure 1 As shown, the aircraft further includes an electric propulsion device 20. The electric propulsion device 20 is a device that provides power for the aircraft. The number of the electric propulsion device 20 is one or more, for example Figure 1As shown, the aircraft includes eight electric propulsion devices 20. The electric propulsion devices 20 are arranged on the wings 12, and / or the fuselage 11, and / or the tail 13, that is, the electric propulsion devices 20 can be arranged on at least one of the wings 12, the fuselage 11 and the tail 13.

[0103] For example, Figure 1 As shown, the electric propulsion devices 20 are symmetrically arranged on the wings 12 and the tail 13. Of course, in some scenarios, the electric propulsion devices 20 are arranged on the fuselage 11, and the electric propulsion devices 20 are not arranged on the wings 12 and the tail 13. In other scenarios, the electric propulsion devices 20 are arranged on the wings 12, and the electric propulsion devices 20 are not arranged on the fuselage 11 and the tail 13. Alternatively, in other embodiments, the electric propulsion devices 20 are arranged on the tail 13, and the electric propulsion devices 20 are not arranged on the fuselage 11 and the wings 12.

[0104] 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 the 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 one of the arm 14 and the nacelle 15.

[0105] In some embodiments, 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 the nacelle 15 (not shown in the figure).

[0106] In some embodiments, Figure 1 As shown, the electric propulsion device 20 is disposed on the tail 13 through the nacelle 15. In other embodiments, the electric propulsion device 20 may also be disposed on the tail 13 through the machine arm 14 (not shown in the figure).

[0107] 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 wing 12 , and the tail 13 .

[0108] In some examples, the electric propulsion device 20 installed on the aircraft may include a tilting electric propulsion device 20b, and a tilting mechanism is arranged between the tilting electric propulsion device 20b and any one of the fuselage 11, the wing 12 and the tail 13, and the tilting mechanism is used to adjust the tilt angle of the tilting electric propulsion device 20b.

[0109] In some examples, all electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20a.

[0110] In other examples, all the electric propulsion devices 20 provided on the aircraft are tilting electric propulsion devices 20b.

[0111] In some other examples, some of the electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20a, and some 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. The fixed electric propulsion devices 20a are arranged on the outside of the tilting electric propulsion devices 20b.

[0112] In the embodiment of the present application, the electric propulsion device 20 includes a power battery (not shown in the figure), an electric engine 21 and a propeller 22. The electric engine 21 includes a power motor 30, a motor controller (not shown in the figure) and cables, etc., which can convert electrical energy into mechanical energy. In actual implementation, the electric engine 21 can also be called an electric propulsion system.

[0113] like Figure 1 As shown, the electric engine 21 is arranged on the arm 14 or the nacelle 15, and the propeller 22 is arranged on one side of the electric engine 21. The electric engine 21 is transmission-connected with the propeller 22, and the electric engine 21 is used to drive the propeller 22 to rotate to provide power for the aircraft.

[0114] The embodiment of the present application further provides an electric propulsion device 20. The electric propulsion device 20 includes a propeller 22 and an electric engine 21.

[0115] Figure 2 A schematic structural diagram of an electric motor 21 is shown.

[0116] See also Figure 2 As shown, the electric engine 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.

[0117] The propeller 22 is disposed on one side of the power motor 30 , and the power motor 30 is transmission-connected to the propeller 22 . The power motor 30 is used to drive the propeller 22 to rotate.

[0118] Figure 3 A schematic diagram of the structure of a power motor 30 at a first viewing angle is shown. Figure 4 An exploded view of a power motor 30 is shown.

[0119] See also Figure 3 and Figure 4 As shown, the power motor 30 includes a stator. The stator includes a bracket assembly 31. The bracket assembly 31 can also be called a housing of the power motor 30.

[0120] The stator also includes a core winding assembly. The core winding assembly is arranged in the support assembly 31. The core winding assembly includes a stator core assembly 32 and a stator winding assembly 33 wound on the stator core assembly 32. The stator core assembly 32 includes a plurality of stator cores 321, and the plurality of stator cores 321 are arranged in the support assembly 31 at intervals along the circumferential direction W of the support assembly 31. The stator winding assembly 33 includes a plurality of coil windings 331. Insulating varnish may be applied externally on the coil windings 331. When the stator winding assembly 33 is wound on the stator core assembly 32, a coil winding 331 is wound on each stator core 321.

[0121] The power motor 30 also includes a rotor (not shown in the figure). The rotor is rotatably connected to the bracket assembly 31, and the core winding assembly is used to drive the rotor to rotate. Specifically, when the coil winding 331 is energized, the magnetic field generated by the stator core 321 can drive the rotor to rotate. The rotor is transmission-connected to the propeller 22 so that the rotor can drive the propeller 22 to rotate when rotating to provide power for the aircraft.

[0122] In the process of developing a power motor 30 with high torque density, high power density, etc., 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.

[0123] At present, during the operation of the power motor in the aircraft, the heat generated by it continues to accumulate as the working time increases, causing the temperature inside the power motor to gradually increase, 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 power motor cooling has always been an important research direction in the field of power motors.

[0124] In the related art, the power motor is usually provided with a liquid supply port, which can provide cooling medium to the stator winding assembly in the power motor, so as to dissipate the heat of the stator winding assembly through the cooling medium. However, the liquid supply of the existing power motor is uneven, which easily leads to uneven heat dissipation of the stator winding assembly. The stator winding assembly is the heat source of the power motor. When the stator winding assembly has uneven heat dissipation, it will affect the improvement of the working performance of the power motor.

[0125] 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 has at least a liquid supply channel 34 and a liquid inlet channel 35. The liquid supply channel 34 connects the liquid supply channel 34 and the liquid cooling cavity 310a, so that the cooling medium in the liquid supply channel 34 can enter the liquid cooling cavity 310a through the liquid supply channel 34 to dissipate heat for the coil winding 331. At the same time, the stator winding assembly 33 in the core winding assembly can be cooled more evenly at various parts in the circumferential direction, thereby improving the working performance of the power motor 30.

[0126] It should be noted that the cooling medium can be a liquid medium such as cooling oil, cooling water, etc.

[0127] The following uses cooling oil as an example of a cooling medium, and combines the drawings and embodiments to further illustrate the structure of the power motor 30 provided in the embodiment of the present application.

[0128] See also Figure 3 and Figure 4 As shown, as described above, the power motor 30 includes a bracket assembly 31 and an iron core winding assembly. Figure 4 2 shows the structure of the stator core assembly 32 and the stator winding assembly 33 in the core winding assembly. The arrangement of the stator winding assembly 33 on the stator core assembly 32 can refer to the relevant description above, and no further description will be given here.

[0129] Figure 5 A partial schematic diagram of a stator winding assembly 33 is shown.

[0130] See also Figure 5 As shown, in addition to the coil winding 331 , the stator winding assembly 33 further includes insulating paper 332 , and the insulating paper 332 is provided on one side of the same coil winding 331 facing the stator core 321 on which the winding is arranged.

[0131] Figure 6 The internal schematic diagram of a power motor 30 is shown. Figure 7 for Figure 6 A partial schematic diagram of the medium power motor 30.

[0132] See also Figure 6 and Figure 7 As shown, the core winding assembly is arranged in the support assembly 31. Specifically, as Figure 7 As shown in the figure, the support 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 support 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.

[0133] Since the stator winding assembly 33 is disposed in the liquid cooling cavity 310 a , when the cooling medium flows into the liquid cooling cavity 310 a , it can take away the heat of the coil winding 331 in the stator winding assembly 33 , so as to achieve heat dissipation for the coil winding 331 .

[0134] Since the coil winding 331 serves as a heat source for the core winding assembly, when the cooling medium flows into the liquid cooling chamber 310 a and takes away the heat of the coil winding 331 , heat dissipation for the core winding assembly can be achieved.

[0135] Figure 8 A partial internal schematic diagram of a power motor 30 is shown. Figure 1 , Fig. 9 A partial internal schematic diagram of a power motor 30 is shown. Figure 2 .

[0136] See also Figure 8 and Fig. 9 As shown, the support assembly 31 includes a stator support 311, a first stopper 312, a second stopper 313 and a sleeve 314. For example, the sleeve 314 may be made of carbon fiber. The core winding assembly is sleeved on the outer side of the stator support 311 in the radial direction X, and the sleeve 314 is sleeved on the outer side of the core winding assembly in the radial direction X. The first stopper 312 is connected to one end of the sleeve 314 and the stator support 311, and the first stopper 312 is sealedly connected to the sleeve 314 and the stator support 311. The second stopper 313 is connected to the other end of the sleeve 314 and the stator support 311, and the second stopper 313 is sealedly connected to the sleeve 314 and the stator support 311.

[0137] The stator support 311 , the sleeve 314 , the first cover 312 and the second cover 313 are used to enclose and form a liquid cooling chamber 310 a to enable the core winding assembly to be installed in the support assembly 31 , while ensuring the sealing of the liquid cooling chamber 310 a .

[0138] Fig.10 This is a structural diagram of the power motor 30 provided in an embodiment of the present application at a second viewing angle, Fig.11 Shows Fig.10 Partial schematic diagram of the medium power motor 30 Figure 1 The assembly effect of the stator core assembly 32 and the stator winding assembly 33 in the bracket assembly 31 can be seen in Fig.10 and Fig.11 shown.

[0139] Due to the arrangement of the first cover 312 and the second cover 313 , when disassembling the core winding assembly, it is only necessary to open the first cover 312 or the second cover 313 to realize the disassembly of the core winding assembly in the bracket assembly 31 , thereby simplifying the disassembly of the core winding assembly in the bracket assembly 31 .

[0140] In some embodiments, the first stopper 312 can be sealed and connected with the sleeve 314 and the stator bracket 311 by means of a sealing ring, a sealant, or a combination of a sealant and a fastener. For example, the fastener can be a rivet, etc. The sealant can be a high-temperature resistant and high-strength epoxy structural adhesive. Similarly, the second stopper 313 can also be sealed and connected with the sleeve 314 and the stator bracket 311 by means of a sealing ring, a sealant, or a combination of a sealant and a fastener.

[0141] Fig.12 Shows Fig.11 A schematic structural diagram of the medium power motor 30 without the stator winding assembly 33 .

[0142] See also Fig.12 As shown, in some embodiments, in addition to the stator core 321, the stator core 321 group further includes a core fixing ring 322. The plurality of stator cores 321 may be arranged in an array along the circumferential direction W (360°) of the core fixing ring 322. The stator core 321 may be fixed in the stator bracket 311 by the core fixing ring 322 to enhance the fixing effect of the core winding assembly in the liquid cooling chamber 310a.

[0143] For example, one of the stator core 321 and the core fixing ring 322 may be provided with a groove 3221, and the other may be provided with a protrusion 3211 that matches (is identical to or similar to) the structure of the groove 3221, and the protrusion 3211 may be embedded in the groove 3221 to achieve the clamping connection between the stator core 321 and the core fixing ring 322. Fig.12 , a structure in which a protrusion 3211 is provided on the stator core 321 and a groove 3221 is provided on the core fixing ring 322 is shown.

[0144] Taking this structure as an example, a plurality of grooves 3221 may be provided on the circumferential direction W of the core fixing ring 322 , so that each stator core 321 can be snap-fitted with the core fixing ring 322 .

[0145] See also Fig.11 As shown, the core fixing ring 322 and the stator bracket 311 can also be connected by using the protrusion 3211 and the groove 3221 mentioned above.

[0146] It should be understood that, in some embodiments, the stator core 321 and the core fixing ring 322 , as well as the core fixing ring 322 and the stator bracket 311 may be connected by fasteners such as screws and bolts.

[0147] In some embodiments, one end of the stator core 321 away from the core fixing ring 322 may also be fixed to the sleeve 314 .

[0148] Fig.13shows an internal schematic diagram of a stator support 311, Fig.14 shows a partial internal schematic diagram of a stator support 311, Fig.15 A partial schematic diagram of a bracket assembly 31 provided in an embodiment of the present application.

[0149] See also Figures 13 to 15 As shown, in some embodiments, the support assembly 31 further has a liquid supply channel 34 and a liquid inlet channel 35. The inlet of the liquid supply channel 34 is communicated with the outlet of the liquid inlet channel 35.

[0150] The liquid supply channel 34 extends along the outer circumferential direction of the stator core assembly 32. The outer circumferential direction of the stator core assembly 32 can be understood as the side of the stator core assembly 32 in the circumferential direction W facing the liquid cooling cavity 310a.

[0151] Fig.16 A partial schematic diagram of a power motor 30 provided in an embodiment of the present application Figure 2 , Fig.17 A structural schematic diagram of a stator bracket 311 is shown.

[0152] See also Fig.14 , Fig.16 and Fig.17 As shown, the channel wall of the liquid supply channel 34 has a plurality of liquid supply ports 342 spaced apart along the extension direction of the liquid supply channel 34. The liquid supply channel 34 is connected to the liquid cooling chamber 310a through the liquid supply ports 342, so that the liquid inlet channel 35 can be connected to the liquid cooling chamber 310a through the liquid supply channel 34. In this way, the cooling medium can enter the liquid supply channel 34 through the liquid inlet channel 35, and when flowing in the liquid supply channel 34 along the circumferential direction W of the stator core assembly 32, it can be output into the liquid cooling chamber 310a from different directions of the circumferential direction W of the stator core assembly 32 through different liquid supply ports 342 on the liquid supply channel 34. After the cooling medium enters the liquid cooling chamber 310a, it can be coated on the coil winding 331 in the stator winding assembly 33, directly contact the coil winding 331, take away the heat of the coil winding 331, and achieve heat dissipation of the coil winding 331 and the stator winding assembly 33.

[0153] See also Fig.17 Combined with Fig.15 As 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 .

[0154] 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 in the liquid supply port 342 through which the cooling medium can pass, and the flow area can also be understood as the opening area of ​​the liquid supply port 342.

[0155] Due to the presence of the liquid supply port 342, part of the pressure of the cooling medium will be released through the liquid supply port 342 when it flows in the liquid supply channel 34. The end of the liquid supply channel 34 that is away from the inlet is defined as the distal end. The longer the cooling medium flows in the liquid supply channel 34 toward the distal end of the liquid supply channel 34, the more pressure may be released, and the flow rate reaching the distal end of the liquid supply channel 34 will also be smaller. 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 further affect the heat dissipation capacity of the cooling medium output from the distal end of the liquid supply channel 34.

[0156] In contrast, in the present application, when 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 pressure drop of the cooling medium output by the liquid supply port 342 at the far end of the liquid supply channel 34 can be made smaller, so as to reduce the flow difference between the cooling medium output by the liquid supply port 342 at the far end of the liquid supply channel 34 and the liquid supply port 342 close to its own inlet side.

[0157] In this way, it is beneficial to improve the uniformity of the cooling medium outputted from the liquid supply port 342 on the liquid supply channel 34, so that the cooling medium can flow into the liquid cooling chamber 310a in the liquid supply channel 34, and 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 evenly, take away the heat of the coil winding 331, and make the cooling (temperature) of each part of the stator winding assembly 33 in the circumferential direction W more uniform, so as to fully dissipate the heat of each part of the stator winding assembly 33, improve the heat dissipation effect of the stator winding assembly 33 and the working performance of the power motor 30. At the same time, since the stator winding assembly 33 is immersed in the cooling medium, the utilization rate of the cooling medium can also be improved.

[0158] In some examples, in order 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 away from the inlet of the liquid supply channel 34, the flow area of ​​the liquid supply port 342 can be gradually increased in the direction from the inlet close to the liquid supply channel 34 to the inlet away from the liquid supply channel 34.

[0159] Alternatively, in other examples, when designing the liquid supply channel 34, the flow area of ​​the liquid supply port 342 close to the inlet of the liquid supply channel 34 may be smaller than the flow area of ​​the liquid supply port 342 far from the inlet of the liquid supply channel 34, without following the rule that the flow area of ​​the liquid supply port 342 mentioned above gradually increases.

[0160] See also Fig.15As shown, in some embodiments, in the extension direction of the liquid supply channel 34, the inlet of the liquid supply channel 34 can be located at the middle position of the liquid supply channel 34 itself, and the middle position of the liquid supply channel 34 refers to a position close to the middle of the liquid supply channel 34 itself. Liquid supply ports 342 are opened on the channel walls of the liquid supply channel 34 on both sides of the inlet of the liquid supply channel 34. For example, multiple liquid supply ports 342 can be opened on the channel walls on both sides of the inlet of the liquid supply channel 34. In this case, the liquid supply channel 34 has two distal ends.

[0161] By arranging the inlet of the liquid supply channel 34 to be located in the middle of the liquid supply channel 34, the cooling medium can flow in two different directions toward the corresponding distal ends to the liquid cooling cavity 310a when flowing in the liquid supply channel 34, so that the cooling medium has a small pressure difference between the distal end and the inlet of the liquid supply channel 34. In this way, the flow rate of the cooling medium outputted from each liquid supply port 342 of the liquid supply channel 34 can be more uniform, which can further improve the uniformity of the cooling medium for the stator winding assembly 33.

[0162] See also Fig.15 As shown, in some embodiments, the liquid supply channel 34 includes at least two liquid supply sections 341 distributed along the circumferential direction W of the stator core assembly 32. The liquid supply section 341 extends along the outer circumferential direction of the stator core assembly 32. The liquid supply section 341 is connected to the liquid cooling cavity 310a.

[0163] Specifically, the flow channel wall of the liquid supply section 341 has 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 connected to the liquid cooling chamber 310a through the liquid supply ports 342, so that the cooling medium can be output to the liquid cooling chamber 310a along the radial direction X of the stator core assembly 32 through the plurality of liquid supply ports 342 of the same liquid supply section 341, so as to quickly cover the coil winding 331 and dissipate heat for the stator winding assembly 33.

[0164] 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 from the inlet of the liquid supply section 341. In this way, while the liquid supply section 341 of the liquid supply channel 34 is connected to the liquid cooling chamber 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 from the inlet of the liquid supply section 341.

[0165] For example, in some examples, for the same liquid supply section 341, the flow area of ​​the liquid supply port 342 can be gradually increased in the direction from the inlet close to the liquid supply section 341 to the inlet far away from 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 far away from the inlet of the liquid supply section 341.

[0166] See also Fig.15 As shown, in addition to the liquid supply channel 34 and the liquid inlet channel 35, the bracket assembly 31 also has a bypass channel 36. The liquid supply channel 34, the liquid inlet channel 35 and the bypass channel 36 are located on the stator bracket 311 to realize the arrangement of the liquid supply channel 34, the liquid inlet channel 35 and the bypass channel 36 on the bracket assembly 31. At this time, the liquid supply port 342 is also arranged on the stator bracket 311.

[0167] The inlet of one of the at least two liquid supply sections 341 is connected to the outlet of the liquid inlet channel 35. The inlet of the remaining liquid supply section 341 of the at least two liquid supply sections 341 is connected to the bypass channel 36, and the inlet of the bypass channel 36 is connected to the liquid inlet channel 35, so that the inlet of the remaining liquid supply section 341 of the at least two liquid supply sections 341 is connected to the liquid inlet channel 35 through the bypass channel 36. In this way, the cooling medium can enter the bypass channel 36 through the outlet of the liquid inlet channel 35, and enter the liquid supply section 341 connected to the bypass channel 36 through the bypass channel 36.

[0168] By distributing at least two liquid supply sections 341 along the circumferential direction W of the stator core assembly 32, the cooling medium can be input into the stator winding assembly 33 from different positions in the circumferential direction W of the stator core assembly 32 to achieve the coating of the stator winding assembly 33 in the circumferential direction W, so as to make the heat dissipation (temperature) of each part of the stator winding assembly 33 in the circumferential direction W more uniform.

[0169] Since the liquid inlet channel 35 is arranged at a position close to the edge of the support assembly 31 in the circumferential direction W, when at least two liquid supply sections 341 are distributed along the circumferential direction W of the stator core assembly 32, some of the liquid supply sections 341 will be farther away from the outlet of the liquid inlet channel 35. If at least two liquid supply sections 341 are distributed along the circumferential direction W of the stator core assembly 32, two adjacent liquid supply sections 341 are interconnected, at this time, the far end of the liquid supply channel 34 will be farther away from the outlet of the liquid inlet channel 35, and the flow rate of the cooling medium output from the far end of the liquid supply channel 34 will still be small.

[0170] In contrast, in the present application, by setting the bypass channel 36, when the cooling medium is output through the bypass channel 36 and the liquid supply section 341 connected to the bypass channel 36 and enters the liquid cooling chamber 310a, the bypass channel 36 can supply liquid to the liquid supply section 341 at a position far from the outlet of the liquid inlet channel 35. In addition, since the bypass channel 36 is not provided with a liquid supply port 342, the pressure difference when the cooling medium flows from the outlet of the liquid inlet channel 35 to the inlet of the liquid supply section 341 through the bypass channel 36 can be reduced. In this way, the uniformity of the flow rate of the cooling medium output from each liquid supply port 342 of the liquid supply channel 34 can be further improved, and the uniformity of the heat dissipation of the stator winding assembly 33 by the cooling medium can be further improved.

[0171] See also Fig.15 As shown, in some embodiments, since the bypass channel 36 can reduce the pressure difference when the cooling medium flows from the outlet of the liquid inlet channel 35 through the bypass channel 36 to the inlet of the liquid supply section 341, the uniformity of the flow rate of the cooling medium output from each liquid supply port 342 of the liquid supply channel 34 is improved.

[0172] Therefore, in some embodiments, a liquid supply channel 34, a bypass channel 36 and a liquid inlet channel 35 may also be provided on the bracket assembly 31, and by providing at least two liquid supply sections 341 in the liquid supply channel 34, the inlet of one of the at least two liquid supply sections 341 is connected to the outlet of the liquid inlet channel 35, and the inlet of the remaining liquid supply section 341 of the at least two liquid supply sections 341 is connected to the bypass channel 36.

[0173] Moreover, at this time, there is no need to limit the number of liquid supply ports 342 on the liquid supply section 341, and the uniformity of heat dissipation of the stator winding assembly 33 by the cooling medium can also be improved. It should be noted that for this embodiment, when there are multiple liquid supply ports 342 on the liquid supply section 341, the arrangement of the multiple liquid supply ports 342 and the design of the flow area can refer to the relevant description above.

[0174] The following is an example in which the support assembly 31 has a liquid inlet channel 35, a bypass channel 36 and a liquid supply channel 34 (including at least two liquid supply sections 341) to further illustrate the structure of the support assembly 31 and the power motor 30.

[0175] Fig.18 and Fig.19 The schematic diagrams of the structure of the stator support 311 at the liquid supply section 341 and the liquid inlet channel 35 at different viewing angles are shown.

[0176] See also Fig.18 and Fig.19 As shown, in the extension direction of the liquid supply channel 34 , at least two adjacent liquid supply sections 341 are separated and arranged, so that along the extension direction of the liquid supply channel 34 , the adjacent liquid supply sections 341 are not connected.

[0177] For example, the liquid supply channel 34 may be disconnected between adjacent liquid supply sections 341 , so that there is a distance between adjacent liquid supply sections 341 in the extending direction of the liquid supply channel 34 , thereby separating adjacent liquid supply sections 341 .

[0178] Alternatively, a blocking structure may be provided between adjacent liquid supply sections 341 in the liquid supply channel 34, and the blocking structure presses against the inner side of the channel wall of the liquid supply channel 34, thereby blocking the connection between adjacent liquid supply sections 341 and separating adjacent liquid supply sections 341.

[0179] Compared with the adjacent liquid supply sections 341 being connected, when the adjacent liquid supply sections 341 are not connected in the extension direction of the liquid supply channel 34, the cooling medium can be prevented from affecting each other in the adjacent liquid supply sections 341, so as to ensure that the cooling medium can be output through the liquid supply port 342 of the liquid supply section 341, and evenly 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, thereby ensuring the uniformity of heat dissipation of each part of the core winding assembly. At the same time, when the adjacent liquid supply sections 341 are not connected in the extension direction of the liquid supply channel 34, it is also possible to make it easier to control the flow rate of the cooling medium output from the liquid supply port 342 on the adjacent liquid supply section 341.

[0180] At least two liquid supply sections 341 include a first liquid supply section 341a and a second liquid supply section 341b. The inlet of the first liquid supply section 341a is connected to the outlet of the liquid inlet channel 35. The inlet of the second liquid supply section 341b is connected to the bypass channel 36. In other words, the liquid supply channel 34 includes a first liquid supply section 341a and a second liquid supply section 341b distributed along the circumferential direction W of the stator core assembly 32. At this time, the cooling medium can enter the first liquid supply section 341a and the second liquid supply section 341b respectively through the outlet of the liquid inlet channel 35, and be output and enter the liquid cooling chamber 310a through the liquid supply ports 342 on the first liquid supply section 341a and the second liquid supply section 341b respectively, so as to dissipate heat for the coil winding 331.

[0181] For the convenience of description, hereinafter, one of the at least two liquid supply sections 341 whose inlet is connected (directly connected) to the outlet of the liquid inlet channel 35 is referred to as the first liquid supply section 341a, and one of the at least two liquid supply sections 341 whose inlet is connected to the outlet of the liquid inlet channel 35 through the bypass channel 36 is referred to as the second liquid supply section 341b.

[0182] It should be noted that Fig.18 Only one second liquid supply section 341b is shown. For example, in some embodiments, the number of the second liquid supply sections 341b on the bracket assembly 31 can be two, three, etc.

[0183] Taking the two second liquid supply sections 341b as an example, the two second liquid supply sections 341b can also be arranged at intervals along the circumferential direction W of the stator core assembly 32, and the inlets of the two second liquid supply sections 341b can be connected to the outlet of the liquid inlet channel 35 through a bypass channel 36 respectively.

[0184] The following uses the example of the support assembly 31 having a second liquid supply section 341 b to further illustrate the structures of the support assembly 31 and the power motor 30 .

[0185] When the liquid supply channel 34 includes a first liquid supply section 341a and a second liquid supply section 341b, the first liquid supply section 341a can be separated from the second liquid supply section 341b in the circumferential direction W of the stator core assembly 32, the first liquid supply section 341a can be arranged opposite to the second liquid supply section 341b along the radial direction X of the stator core assembly 32, or the inlet of the first liquid supply section 341a can be arranged opposite to the inlet of the second liquid supply section 341b along the radial direction X of the stator core assembly 32. In this way, the liquid supply channel 34 can be evenly distributed on the circumferential side of the core winding assembly. The bypass channel 36 can make the flow rate of the cooling medium flowing out of the liquid supply port 342 at the nearest and farthest positions from the outlet of the liquid inlet channel 35 more uniform, which is conducive to improving the uniformity of the cooling medium flowing out of the liquid supply port 342 spaced apart in the entire circumferential direction W of the bracket assembly 31.

[0186] refer to Fig.18 As shown, in the extension direction of the liquid supply section 341, the inlet of the liquid supply section 341 can be located in the middle of the liquid supply section 341, and the middle of the liquid supply section 341 refers to a position close to the middle of the liquid supply section 341 itself. The liquid supply section 341 is provided with liquid supply ports 342 on the flow channel walls on both sides of its own inlet. 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 in the middle of the 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 in the middle of the liquid supply section 341b.

[0187] By limiting the inlet position of the liquid supply section 341, when the cooling medium flows in the liquid supply section 341, the cooling medium can flow toward the corresponding distal ends in two different directions to the liquid cooling cavity 310a, so that the cooling medium has a small pressure difference between the distal end and the inlet of the liquid supply section 341. In this way, the flow rate of the cooling medium output from each liquid supply port 342 of the liquid supply section 341 can be more uniform, which can further improve the uniformity of the cooling medium for the stator winding assembly 33.

[0188] In some embodiments, when the first liquid supply section 341a and the second liquid supply section 341b are arranged opposite to each other along the radial direction X of the stator core assembly 32, along the axial direction Z of the stator core assembly 32, the first stopper 312 can be arranged at one end of the stator support 311 where the first liquid supply section 341a is arranged, and the second stopper 313 can be arranged at one end of the stator support 311 away from the first liquid supply section 341a. Fig. 9 As shown, a liquid outlet 315 can be provided on the second blocking cover 313 so that the coil winding 331 flows through the coil winding 331 in the core winding assembly along the axial direction Z of the stator core assembly 32, takes away the heat of the coil winding 331, and then outputs the liquid cooling cavity 310a from the liquid outlet 315, so that the cooling medium can be reused after heat dissipation, thereby improving the utilization rate of the cooling medium.

[0189] Alternatively, in some embodiments, the liquid outlet 315 may also be disposed on the first blocking cover 312. In other words, the liquid outlet 315 may be disposed on the first blocking cover 312 or the second blocking cover 313.

[0190] See also Fig.19 Combined with Figure 8 As shown, in some embodiments, in the radial direction X of the stator core assembly 32, the liquid inlet channel 35 can be located on the side of the liquid supply channel 34 and the bypass channel 36 away from the liquid cooling chamber 310a to avoid interference between the liquid inlet channel 35 and the core winding assembly in the liquid cooling chamber 310a.

[0191] Fig. 20 A partial schematic diagram of a stator support 311 on one side of the liquid inlet channel 35 is shown.

[0192] See also Fig. 20 As shown, in some embodiments, the opening direction of the outlet of the liquid inlet channel 35 can be along the radial direction X of the stator core assembly 32 and toward the liquid cooling chamber 310a, so that the cooling medium can flow more evenly along both 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) after being output from the outlet of the liquid inlet channel 35.

[0193] See also Fig. 20 As shown, in some embodiments, the support assembly 31 may further include a first sub-flow guiding channel 3721 , wherein the first sub-flow guiding channel 3721 extends along the axial direction Z of the stator core assembly 32 .

[0194] For the liquid supply section 341 whose inlet is connected to the outlet of the liquid inlet channel 35: the outlet of the liquid inlet channel 35 is connected to the inlet of the first sub-diversion channel 3721, and the outlet of the first sub-diversion channel 3721 is connected to the inlet of the liquid supply section 341, so as to realize the connection between the outlet of the liquid inlet channel 35 and the inlet of the first liquid supply section 341a through the first sub-diversion channel 3721.

[0195] By setting the first sub-guiding flow channel 3721, the relative positions of the inlet of the liquid supply section 341 and the outlet of the liquid inlet flow channel 35 in the axial direction Z of the stator core assembly 32 can be more flexible. At the same time, since the first sub-guiding flow channel 3721 extends along the axial direction Z of the stator core assembly 32, the cooling medium output from the outlet of the liquid inlet flow channel 35 can also be diffused in the first sub-guiding flow channel 3721 along the axial direction Z of the stator core assembly 32 through the first sub-guiding flow channel 3721, so that more cooling medium can be uniformly guided along the circumferential direction W of the stator core assembly 32 to the two sides of the circumferential direction W of the stator winding assembly 33, thereby enhancing the uniformity of the flow of the cooling medium along the two sides of the circumferential direction W of the stator winding assembly 33.

[0196] See also Fig. 20 As shown, in some embodiments, the outlet of the liquid inlet channel 35 may include a first port 351 and a second port 352. For the liquid supply section 341 whose inlet is connected to the outlet of the liquid inlet channel 35: the first port 351 may be connected to the inlet of the liquid supply section 341. For example, the first port 351 may be connected to the inlet of the first liquid supply section 341a. The second port 352 may be connected to the inlet of the bypass channel 36, so as to realize the connection between the outlet of the liquid inlet channel 35 and the inlet of the first liquid supply section 341a and the inlet of the bypass channel 36 respectively.

[0197] Compared with the first liquid supply section 341a, due to the introduction of the bypass flow channel 36, the cooling medium input from the outlet of the liquid inlet flow channel 35 has a longer path to enter the second liquid supply section 341b, and has a certain flow resistance during the flow process, which will cause the flow rate of the cooling medium to decrease when entering the second liquid supply section 341b. The flow area of ​​the first port 351 can be equal to the flow area of ​​the second port 352, but this may cause the flow rate of the cooling medium output from the liquid supply port 342 of the second liquid supply section 341b to be smaller than the flow rate of the cooling medium output from the liquid supply port 342 of the first liquid supply section 341a.

[0198] To this end, 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 into the bypass channel 36 through the outlet of the liquid inlet channel 35 is large, thereby overcoming the resistance when flowing in the bypass channel 36, and reducing the difference between the flow rate of the cooling medium output from the liquid supply port 342 of the second liquid supply section 341b and the flow rate of the cooling medium output from the liquid supply port 342 of the first liquid supply section 341a, so that the flow rate of the cooling medium output from the liquid supply port 342 of the second liquid supply section 341b and the flow rate of the cooling medium output from the liquid supply port 342 of the first liquid supply section 341a are uniform.

[0199] In some embodiments, when the flow area of ​​the first port 351 may be smaller than the flow area of ​​the second port 352, the flow area of ​​the liquid supply section 341 (first liquid supply section 341a) whose inlet is connected to the outlet of the liquid inlet channel 35 may also be greater than or equal to the flow area of ​​the first port 351, and the flow area of ​​the bypass channel 36 and the liquid supply section 341 (second liquid supply section 341b) connected to the bypass channel 36 may also be greater than or equal to the flow area of ​​the second port 352. With such a configuration, the cooling medium can quickly enter the liquid cooling chamber 310a via the first liquid supply section 341a, or quickly enter the liquid cooling chamber 310a via the bypass channel 36 via the second liquid supply section 341b, thereby improving the heat dissipation efficiency of the core winding assembly.

[0200] See also Fig. 20As shown, in some embodiments, the bypass flow channel 36 may extend along the circumferential direction W of the stator core assembly 32, and the bypass flow channel 36 and the liquid supply flow channel 34 are sequentially arranged along the axial direction Z of the stator core assembly 32. For example, along the axial direction Z of the stator core assembly 32, the bypass flow channel 36 may be arranged on a side of the stator bracket 311 facing the second blocking cover 313.

[0201] By limiting the extension direction of the bypass channel 36 and the layout position relative to the liquid supply channel 34, on the basis of ensuring that the bypass channel 36 is connected to the inlet of the second liquid supply section 341b and the outlet of the liquid inlet channel 35, compared with the bending arrangement of the bypass channel 36 in 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 when the cooling medium is output from the liquid supply port 342 of the first liquid supply section 341a and the second liquid supply section 341b.

[0202] Furthermore, by adjusting the extension direction of the bypass channel 36 and the layout position relative to the liquid supply channel 34 , the arrangement of the bypass channel 36 on the bracket assembly 31 can be made easier.

[0203] Fig.21 A schematic structural diagram of a stator support 311 at the outlet position of the bypass flow channel 36 is shown.

[0204] See also Fig. 20 and Fig.21 As shown, the outlet of the bypass flow channel 36 and the inlet of the bypass flow channel 36 may be located at two ends of the extension direction of the bypass flow channel 36 , respectively.

[0205] See also Fig.21 As shown, in the liquid supply section 341 (second liquid supply section 341b) connected to the bypass flow channel 36, the liquid supply section 341 includes a first subsection 3411 and a second subsection 3412 distributed along the circumferential direction W of the stator core assembly 32. The flow direction of the cooling medium in the first subsection 3411 is opposite to the flow direction of the cooling medium in the bypass flow channel 36, and the flow direction of the cooling medium in the second subsection 3412 is the same as the flow direction of the cooling medium in the bypass flow channel 36. The cooling medium output from the outlet of the bypass flow channel 36 can be output from different radial directions X of the stator core assembly 32 through the liquid supply ports 342 on the first subsection 3411 and the second subsection 3412, so that the liquid supply section 341 connected to the bypass flow channel 36 can be filled with liquid from its middle section. In the circumferential direction W of the stator core assembly 32 , the first subsegment 3411 and the bypass channel 36 may be located on the same side of the inlet of the second liquid supply segment 341 b , and the second subsegment 3412 and the bypass channel 36 may be located on different sides of the inlet of the second liquid supply segment 341 b .

[0206] The support assembly 31 also has a second sub-guiding flow channel 3722. The outlet of the bypass flow channel 36 is connected to one end of the first sub-segment 3411 close to the second sub-segment 3412 and one end of the second sub-segment 3412 close to the first sub-segment 3411 through the second sub-guiding flow channel 3722. The second sub-guiding flow channel 3722 is used to make the flow rate of the cooling medium flowing into the first sub-segment 3411 and the flow rate of the cooling medium flowing into the second sub-segment 3412 uniform. Such a configuration can make the flow rate of the cooling medium output from the liquid supply ports 342 of the first sub-segment 3411 and the second sub-segment 3412 more uniform, so as to ensure that the cooling medium can have good heat dissipation performance for the core winding assembly when it is 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.

[0207] See also Fig.21 As shown, in some embodiments, the second sub-guiding channel 3722 may include a first sub-guiding segment 3723 and a second sub-guiding segment 3724. The first sub-segment 3411 is connected to the bypass channel 36 through the first sub-guiding segment 3723. The second sub-segment 3412 is connected to the bypass channel 36 through the second sub-guiding segment 3724. Through the arrangement of the first sub-guiding segment 3723 and the second sub-guiding segment 3724, the second sub-guiding channel 3722 can connect the outlet of the bypass channel 36 with the first sub-segment 3411 and the second sub-segment 3412 respectively.

[0208] For example, the second sub-guiding flow channel 3722 includes a liquid separation flow channel 373. The liquid separation flow channel 373 extends along the circumferential direction W of the stator core assembly 32, and one end of the liquid separation flow channel 373 on the circumferential direction W of the stator core assembly 32 is connected to the outlet of the bypass flow channel 36. On the circumferential direction W of the stator core assembly 32, the second sub-guiding section 3724 is located at one end of the liquid separation flow channel 373 away from the outlet of the bypass flow channel 36, the first sub-guiding section 3723 is located between the outlet of the bypass flow channel 36 and the second sub-guiding section 3724, and the first sub-guiding section 3723 is separated from the second sub-guiding section 3724. The inlet of the first sub-segment 3411 is connected to the liquid separation flow channel 373 through the first sub-guiding section 3723, and the inlet of the second sub-segment 3412 is connected to the liquid separation flow channel 373 through the second sub-guiding section 3724. By disposing the liquid separation channel 373 , the first sub-guiding segment 3723 and the second sub-guiding segment 3724 , it is possible to realize that the outlet of the bypass channel 36 is connected to the first sub-segment 3411 and the second sub-segment 3412 , respectively.

[0209] The flow area of ​​the first sub-guiding segment 3723 may be greater than the flow area of ​​the second sub-guiding segment 3724. Alternatively, the flow area of ​​the first sub-guiding segment 3723 may be equal to the flow area of ​​the second sub-guiding segment 3724. Since the flow direction of the cooling medium in the second sub-segment 3412 is the same as the flow direction of the cooling medium in the bypass flow channel 36, after the cooling medium flows out of the bypass flow channel 36, it is easier to enter the second sub-segment 3412 through the second sub-guiding segment 3724. When the flow area of ​​the first sub-guiding segment 3723 is equal to the flow area of ​​the second sub-guiding segment 3724, the flow rate of the cooling medium at the inlet of the first sub-segment 3411 may be lower than the flow rate of the cooling medium at the inlet of the second sub-segment 3412.

[0210] Therefore, compared with the flow area of ​​the first sub-guide segment 3723 being equal to the flow area of ​​the second sub-guide segment 3724, when the flow area of ​​the first sub-guide segment 3723 is greater than the flow area of ​​the second sub-guide segment 3724, it is possible to ensure that the flow rate of the cooling medium at the inlet of the first sub-segment 3411 and the flow rate of the cooling medium at the inlet of the second sub-segment 3412 are uniform, so that the flow rate of the cooling medium output from the liquid supply port 342 of the first sub-segment 3411 and the second sub-segment 3412 is more uniform.

[0211] See also Fig.19 As shown, the bracket assembly 31 also has a liquid outlet 315, which is connected to the liquid cooling chamber 310a, so that the cooling medium can flow out of the liquid cooling chamber 310a through the liquid outlet 315 after dissipating the heat to the core winding assembly, so that the cooling medium can enter the liquid cooling chamber 310a again through the liquid inlet channel 35 after dissipating the heat to the core winding assembly, and circulate the heat to the stator winding assembly 33, thereby improving the utilization rate of the cooling medium.

[0212] In some examples, a plurality of liquid outlets 315 may be provided on the support assembly 31, and the plurality of liquid outlets 315 may be distributed at different positions of the stator support 311, so that the cooling medium can quickly dissipate heat after taking away the heat of the coil winding 331, thereby improving the utilization rate of the cooling medium.

[0213] It should be noted that the bracket assembly 31 in the above embodiment, at least through the setting of the liquid supply channel 34 and the liquid inlet channel 35, can enable the cooling medium in the liquid supply channel 34 to evenly enter the liquid cooling chamber 310a along the circumferential direction W of the stator winding assembly 33 through the liquid supply channel 34, thereby fully dissipating the heat of the coil winding 331, thereby improving the working performance of the power motor 30.

[0214] In the related art, the heat dissipation of the stator winding assembly is uneven in the axial direction of the stator core assembly.

[0215] In some embodiments, the bracket assembly 31 can also be designed with 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 can also fully dissipate the heat of the coil winding 331 in the stator winding assembly 33, thereby improving the working performance of the power motor 30.

[0216] Fig. 22 and Fig.23 Schematic diagrams of different structures of two stators in the connecting flow channel 38 are shown. Fig.24 A schematic structural diagram of a spray structure 39 in a power motor 30 is shown.

[0217] Combine the following Figure 8 , Figures 19 to 24 , and specific embodiments, the differences between the bracket assembly 31 and the above embodiments are further described.

[0218] See also Figure 8 As shown, in some embodiments, the cavity wall of the liquid cooling cavity 310a has a liquid outlet 315 and at least two liquid supply ports 342. In the axial direction Z of the stator core assembly 32, at least two liquid supply ports 342 are arranged at intervals. The liquid supply port 342 is used to supply cooling medium to flow into the liquid cooling cavity 310a. The liquid outlet 315 is used to supply cooling medium in the liquid cooling cavity 310a to flow out.

[0219] By arranging at least two liquid supply ports 342 at intervals in the axial direction Z of the stator core assembly 32, the cooling medium output from the liquid inlet channel 35 can be output along the axial direction Z of the stator winding assembly 33 through at least two liquid supply ports 342 and enter the liquid cooling chamber 310a, so that the temperature of the liquid cooling chamber 310a in the axial direction Z of the stator winding assembly 33 is more uniform, so as to ensure that the temperature of the stator winding assembly 33 in the axial direction Z of the stator core assembly 32 is more uniform, thereby achieving uniform heat dissipation of the coil winding 331 in the axial direction Z of the stator core assembly 32, so as 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.

[0220] See also Fig. 22 As shown, in some embodiments, the cavity wall of the liquid cooling cavity 310a may also have at least one liquid supply port 342. A connecting flow channel 38 is provided in the liquid cooling cavity 310a. At least one liquid supply port 342 is connected to the connecting flow channel 38. In this way, when the stator core assembly 32 and other components may block the liquid supply port 342 and affect the output of the cooling medium from the liquid supply port 342, the liquid supply port 342 can input the cooling medium into the liquid cooling cavity 310a through the connecting flow channel 38, so as to achieve uniform heat dissipation of various parts of the stator winding assembly 33, thereby improving the working performance of the power motor 30.

[0221] When there are at least one or at least two liquid supply ports 342, both include a first liquid supply port 3421. The stator core assembly 32 includes a first end 32a and a second end 32b, and the first end 32a and the second end 32b are respectively located at 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 both ends of the axial direction Z, rather than two end faces.

[0222] 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 through the first liquid supply port 3421 and enter the liquid cooling chamber 310a, which is beneficial to enhance the temperature uniformity of the liquid cooling chamber 310a in the axial direction Z of the stator winding assembly 33, and dissipate heat in the coil winding 331 and the stator winding assembly 33 near the bottom area.

[0223] It should be noted that the area of ​​the stator winding assembly 33 close to the bottom can be understood as the area of ​​the stator winding assembly 33 adjacent to the first end 32a.

[0224] The first liquid supply port 3421 is in communication with the communication channel 38, and the portion of the liquid cooling chamber 310a that is in communication with the liquid outlet 315 is in communication with the communication channel 38, so as to realize the communication between the first liquid supply port 3421 and the liquid outlet 315. At the same time, since the first liquid supply port 3421 is located between the first end 32a and the second end 32b, it may be blocked by the stator core assembly 32. The embodiment of the present application can avoid the stator core assembly 32 blocking the first liquid supply port 3421 through the setting of the communication, so that the cooling medium can easily enter the liquid cooling chamber 310a to dissipate heat for the coil winding 331.

[0225] See also Fig. 22 As shown, in some embodiments, in the axial direction Z of the stator core assembly 32, a first spacing space 310b is provided between the end of the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a. For example, a first spacing space 310b is provided between the first end 32a of the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a.

[0226] The liquid outlet 315 can be communicated with the first partition space 310b. The first partition space 310b is communicated with the communication channel 38, so that the communication channel 38 can be communicated with the part of the liquid cooling cavity 310a that is communicated with the liquid outlet 315 through the first partition space 310b. In this way, after the cooling medium flows in the communication channel 38 and absorbs the heat of the coil winding 331, it can flow to the liquid outlet 315 through the first partition space 310b, and finally output the liquid cooling cavity 310a from the liquid outlet 315 to achieve heat dissipation of the coil winding 331.

[0227] See also Fig. 22As shown, when there is a first spacing space 310b between the end of the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a, in some examples, the stator core assembly 32 includes a first surface. The first surface of the stator core assembly 32 is opposite to the cavity wall of the liquid cooling cavity 310a where the liquid supply port 342 is provided. The first surface of the stator core assembly 32 has a first groove 32c. The first groove 32c and the cavity wall of the liquid cooling cavity 310a where the liquid supply port 342 is provided are surrounded to form a connecting flow channel 38. For example, the first groove 32c and the cavity wall of the liquid cooling cavity 310a where the first liquid supply port 3421 is provided are surrounded to form a connecting flow channel 38.

[0228] 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. Such a configuration enables the groove cavity of the first groove 32c to communicate with the first compartment 310b, thereby realizing the communication between the communication channel 38 and the first compartment 310b. In this way, after the cooling medium flows in the communication channel 38 and absorbs the heat of the coil winding 331, it can enter the first compartment 310b and output the liquid cooling cavity 310a from the liquid outlet 315.

[0229] At the same time, a connecting flow channel 38 is formed by the first groove 32c and the cavity wall of the liquid cooling cavity 310a with a liquid supply port 342. The cooling medium can also flow in the connecting flow channel 38. After a longer path of heat exchange with the stator core assembly 32 and the coil winding 331 wound on the stator core assembly 32, it enters the first spacing space 310b, which can fully dissipate the heat of the coil winding 331, improve the heat dissipation effect of the coil winding 331, and at the same time, can also improve the utilization rate of the cooling medium.

[0230] See also Fig. 22 As shown, when there is a first spacing space 310b between the end of the stator core assembly 32 and the cavity wall of the liquid cooling cavity 310a, in other examples, the liquid cooling cavity 310a has a second groove 3111 in the cavity wall provided with a liquid supply port 342. The second groove 3111 and the stator core assembly 32 are surrounded to form a connecting flow channel 38, and the groove wall of the second groove 3111 has a liquid supply port 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 is connected to the first spacing space 310b.

[0231] For example, the liquid cooling chamber 310a has a second groove 3111 in the chamber wall provided with the first liquid supply port 3421, and the first liquid supply port 3421 is located at the groove wall of the second groove 3111. In the axial direction Z of the stator core assembly 32, the first end 32a of the stator core assembly 32 is located between the two ends of the second groove 3111, so that the groove cavity of the second groove 3111 is connected to the first partition space 310b.

[0232] The present application defines the position of the second groove 3111 so that the groove cavity of the second groove 3111 is connected to the first compartment 310b, thereby realizing the connection between the communication channel 38 and the first compartment 310b. In this way, the cooling medium can also be output from the liquid cooling cavity 310a through the first compartment 310b and the liquid outlet 315 after absorbing the heat of the coil winding 331 through the communication channel 38.

[0233] At the same time, when the cooling medium flows in the connecting flow channel 38, the coil winding 331 can be fully cooled, thereby improving the cooling effect of the coil winding 331 and improving the utilization rate of the cooling medium. The reasons can be found in the above description of the first groove 32c, which will not be repeated here.

[0234] See also Fig.23 As shown, in some embodiments, the stator core assembly 32 has a communication hole, and the communication hole forms a communication channel 38. Through the setting of the communication hole, the liquid supply port 342 is also connected with the liquid cooling chamber 310a, so that the cooling medium can enter the communication hole and the liquid cooling chamber 310a when it is output through the liquid supply port 342, and fully contact the coil winding 331 to dissipate heat.

[0235] As described above, the stator core assembly 32 includes a core fixing ring 322. The core fixing ring 322 includes a first surface and a second surface. The first surface and the second surface of the core fixing ring 322 are respectively located on both sides of the core fixing ring 322 in the radial direction. The core fixing ring 322 can also refer to the direction X in the radial direction.

[0236] See also Fig.23As shown, the connecting hole penetrates the first surface and the second surface, and the connecting hole is located at one end of the first surface of the core fixing ring 322 and is connected to 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 connecting hole is located at one end of the first surface and is connected to the first liquid supply port 3421. There is a second spacing space 310c between the second surface and the cavity wall of the liquid cooling cavity 310a, and the connecting hole is located at one end of the second surface and is connected to the second spacing space 310c, and the second spacing space 310c is connected to the liquid outlet 315. In this way, the cooling medium output from the first liquid supply port 3421 can flow along the connecting hole into the second spacing space 310c, so as to efficiently dissipate heat for the coil winding 331.

[0237] The following takes the example that the bracket assembly 31 has at least two liquid supply ports 342 to further explain the differences between the bracket assembly 31 and the above embodiments.

[0238] See also Fig. 22 and Fig.23 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 may include a plurality of second liquid supply ports 3422.

[0239] In some examples, on the axial direction Z of the stator core assembly 32, the second liquid supply port 3422 is located on the side of the second end 32b of the stator core assembly 32 away from the first end 32a, so that when the cooling medium output by the second liquid supply port 3422 flows along 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 to dissipate heat from various positions of the coil winding 331 on the axial direction Z of the stator core assembly 32.

[0240] See also Fig.24As shown, when the at least two liquid supply ports 342 include the second liquid supply port 3422, in other examples, a spray structure 39 may be further provided on the cavity wall of the liquid cooling cavity 310a. In the axial direction Z of the stator core assembly 32, the spray structure 39 is close to the second end 32b of the stator core assembly 32. For example, the spray structure 39 may be located on the side of the second end 32b of the stator core assembly 32 away from the first end 32a. The second liquid supply port 3422 is in communication with the spray structure 39, and the spray port of the spray structure 39 is in communication with the liquid cooling cavity 310a, and the spray port of the spray structure 39 is used to spray in the direction of the stator core assembly 32. In this way, the cooling medium entering the spray structure 39 can be sprayed onto the coil winding 331 wound on the stator core assembly 32 through multiple spray ports, which can increase the contact area of ​​the cooling medium output from the second liquid supply port 3422 on 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 various positions on the radial direction X of the stator core assembly 32 is more uniform, and the heat dissipation effect of the cooling medium output from the second liquid supply port 3422 on the coil winding 331 can be further enhanced.

[0241] 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 along the axial direction Z of the stator core assembly 32, the spray structure 39 can be provided on the first cover 312 so that the spray structure 39 is connected to the second liquid supply port 3422. For example, the spray structure 39 can be a spray flow channel in the first cover 312, and a plurality of spray ports are provided on the flow channel wall of the spray flow channel. The plurality of spray ports can be provided on the flow channel wall of the spray flow channel along the radial direction X of the stator core assembly 32 to ensure that the cooling medium output through the plurality of spray ports can be sprayed toward the stator core assembly 32 along the radial direction X of the stator core assembly 32.

[0242] See also Fig.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 may 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 a side of the first liquid supply port 3421 away from the second liquid supply port 3422. For example, when 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, and the second liquid supply port 3422 is located on a 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.

[0243] By arranging the first liquid supply port 3421 and the second liquid supply port 3422 in the axial direction Z of the stator core assembly 32, and limiting the position of the liquid outlet 315 relative to the first liquid supply port 3421, the second liquid supply port 3422 can be 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 can be located between the second liquid supply port 3422 and the liquid outlet 315.

[0244] The cooling medium outputted from the second liquid supply port 3422 can dissipate heat from the coil winding 331 through the second end 32 b of the stator core assembly 32 . The cooling medium after dissipating heat can flow toward the liquid outlet 315 along the axial direction Z of the stator core assembly 32 .

[0245] The cooling medium outputted from the first liquid supply port 3421 can dissipate heat to the coil winding 331 from the middle area between the second end 32b and the first end 32a of the stator core assembly 32, and the cooling medium after dissipation can also flow toward the liquid outlet 315 along the axial direction Z of the stator core assembly 32 to reduce the temperature difference of the liquid cooling chamber 310a along the axial direction Z of the stator core assembly 32. In this way, the cooling medium outputted from the first liquid supply port 3421 and the second liquid supply port 3422 can be fully utilized, and the uniformity of heat dissipation to the coil winding 331 along the axial direction Z of the stator core assembly 32 can be improved, and the utilization rate of the cooling medium can be further improved.

[0246] 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 effectively dissipates heat for the coil winding 331, while avoiding the first liquid supply port 3421 outputting too much cooling medium and affecting the utilization rate of the cooling medium.

[0247] See also Fig.19 As shown, in some embodiments, the support assembly 31 has a liquid inlet channel 35 and at least two liquid supply channels 34. In the axial direction Z of the stator core assembly 32, at least two liquid supply channels 34 are distributed in sequence. The channel wall of the liquid supply channel 34 has a liquid supply port 342, and the liquid supply channel 34 is connected to the liquid cooling cavity 310a through the liquid supply port 342. The inlet of the liquid supply channel 34 is connected to the outlet of the liquid inlet channel 35, so that after the cooling medium enters the at least two liquid supply channels 34 from the liquid inlet channel 35, it can supply liquid to the connected liquid supply port 342.

[0248] See also Fig.19As shown, in some embodiments, at least two liquid supply channels 34 include a first liquid supply channel 34a and a second liquid supply channel 34b. In the axial direction Z of the stator core assembly 32, the first liquid supply channel 34a and the second liquid supply channel 34b are distributed in sequence, and the liquid outlet 315 is located on the side of the first liquid supply channel 34a away from the second liquid supply channel 34b. That is to say, 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. Among them, the liquid supply port 342 on the first liquid supply channel 34a can form a first liquid supply port 3421. The liquid supply port 342 on the second liquid supply channel 34b can form a second liquid supply port 3422.

[0249] 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 on the axial direction Z of the stator core assembly 32, thereby improving the uniformity of heat dissipation of the coil winding 331 along the axial direction Z of the stator core assembly 32 and further improving the utilization rate of the cooling medium.

[0250] See also Fig.15 , Fig. 20 and Fig.21 As shown, in some embodiments, at least one liquid supply channel 34 includes at least two liquid supply sections 341 distributed along the circumferential direction W of the stator core assembly 32, and the channel wall of the liquid supply section 341 has a liquid supply port 342, and the liquid supply section 341 is connected to the liquid cooling chamber 310a through the liquid supply port 342. In the same liquid supply channel 34, the inlet of one of the at least two liquid supply sections 341 is connected to the outlet of the liquid inlet channel 35, and the inlet of the remaining liquid supply section 341 of the at least two liquid supply sections 341 is connected to the bypass channel 36, and the inlet of the bypass channel 36 is connected to the liquid inlet channel 35.

[0251] For example, Fig.15 It is shown in the figure that the second liquid supply channel 34b includes at least two liquid supply sections 341 distributed along the circumferential direction W of the stator core assembly 32, and 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.

[0252] In some examples, the second liquid supply channel 34b may also include the first liquid supply segment 341a, or the liquid supply channel 34 formed by the first liquid supply segment 341a and the second liquid supply segment 341b. Fig.15 3 shows that the second liquid supply channel 34b includes a first liquid supply section 341a and a second liquid supply section 341b. For the second liquid supply channel 34b, the inlet of the first liquid supply section 341a can be connected to the outlet of the liquid inlet channel 35, and the inlet of the second liquid supply section 341b can be connected to the outlet of the liquid inlet channel 35 through the bypass channel 36.

[0253] By providing the bypass channel 36 in the liquid supply channel 34 and 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 working performance of the power motor 30. The specific reasons can be found in the relevant description above, which will not be repeated here.

[0254] See also Fig.15 , Fig. 20 and Fig.21 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, and 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 layout is convenient.

[0255] See also Fig. 20 and Fig.21 As shown, the second flow guiding channel 372 may include the first sub-flow guiding channel 3721 and the second sub-flow guiding channel 3722 mentioned above. The connection between the first sub-flow guiding channel 3721 and the second sub-flow guiding channel 3722 between the liquid inlet channel 35 and the liquid supply section 341 of the second liquid supply channel 34b can be referred to the relevant description above, which will not be repeated here.

[0256] See also Fig. 20 and Fig.21As shown, the first flow guiding channel 371 includes a third sub-flow guiding channel 3711. The third sub-flow guiding channel 3711 and the first sub-flow guiding channel 3721 are arranged on the support assembly 31 (for example, the stator support 311) along the axial direction Z of the stator core assembly 32, and both extend along the axial direction Z of the stator core assembly 32 to the outlet of the liquid inlet channel 35, and are connected with the outlet of the liquid inlet channel 35. The first sub-flow guiding channel 3721 is connected with the outlet of the liquid inlet channel 35 and the first liquid supply section 341a in the second liquid supply channel 34b, so that the cooling medium output from the outlet of the liquid inlet channel 35 can enter the first liquid supply section 341a in the second liquid supply channel 34b. The third sub-guiding channel 3711 is connected to the outlet of the liquid inlet channel 35 and the first liquid supply section 341a in the first liquid supply channel 34a, so that the cooling medium output from the outlet of the liquid inlet channel 35 can enter the first liquid supply section 341a in the first liquid supply channel 34a.

[0257] The first flow guiding channel 371 also includes a fourth sub-flow guiding channel 3712. The inlet of the third sub-flow guiding channel 3711 and the fourth sub-flow guiding channel 3712 are relatively arranged on the support assembly 31 (for example, the stator support 311) along the radial direction X of the stator core assembly 32. The outlet of the bypass channel 36 is connected to the inlet of the second liquid supply section 341b in the first liquid supply channel 34a through the fourth sub-flow guiding channel 3712, so that the cooling medium output from the outlet of the liquid inlet channel 35 can enter the inlet of the second liquid supply section 341b of the first liquid supply channel 34a through the bypass channel 36 and the fourth sub-flow guiding channel 3712, and flow along the first sub-section 3411 and the second sub-section 3412 of the second liquid supply section 341b, and output to the liquid cooling chamber 310a through the liquid supply port 342 on the second liquid supply section 341b, so as to dissipate heat for the coil winding 331.

[0258] See also Fig.21 As shown, the fourth sub-guiding channel 3712 includes a third sub-guiding segment 3713 and a fourth sub-guiding segment 3714. The third sub-guiding segment 3713 and the fourth sub-guiding segment 3714 are respectively connected to the two ends of the liquid separation channel 373 in the flow direction, and the third sub-guiding segment 3713 is located on the side of the liquid separation channel 373 adjacent to the bypass channel 36, and the fourth sub-guiding segment 3714 is located on the side of the liquid separation channel 373 adjacent to the third sub-guiding channel 3711. Among them, the flow area of ​​the third sub-guiding segment 3713 is greater than the flow area of ​​the fourth sub-guiding segment 3714, so that the flow rate of the cooling medium entering the third sub-guiding segment 3713 and the fourth sub-guiding segment 3714 through the bypass channel 36 is uniform.

[0259] By disposing the third sub-guiding channel 3711 and the fourth sub-guiding channel 3712, the outlet of the bypass channel 36 can be connected with the first sub-segment 3411 and the second sub-segment 3412 in the second liquid supply segment 341b in the first liquid supply channel 34a.

[0260] It should be noted that after the cooling medium output from the outlet of the bypass channel 36 enters the liquid separation channel 373, it can flow to the first sub-guiding channel 3721 to the fourth sub-guiding channel 3712 respectively through the liquid separation channel 373, so that the cooling medium can flow to the first liquid supply channel 34a and the second liquid supply channel 34b. The second liquid supply section 341b.

[0261] The flow area of ​​the first diversion channel 371 may be smaller than the flow area of ​​the second diversion channel 372. For example, the flow area of ​​the third sub-diversion channel 3711 is smaller than the flow area of ​​the first sub-diversion channel 3721, and the flow area of ​​the fourth sub-diversion channel 3712 is smaller than the flow area of ​​the second sub-diversion channel 3722.

[0262] By limiting the flow areas of the first guide channel 371 and the second guide channel 372 , the flow rate of the cooling medium flowing out of the first liquid supply channel 34a and the liquid supply port 342 of the first liquid supply channel 34a can be larger, which is beneficial to uniform heat dissipation in the axial direction Z.

[0263] See also Figure 2 As shown, in some embodiments, the electric engine 21 further includes a radiator 40. For example, the radiator 40 may be a heat exchanger. The radiator 40 is disposed on the side of the power motor 30 away from the propeller 22. The liquid cooling chamber 310a is communicated with the inlet of the radiator 40, and the outlet of the radiator 40 is communicated with the inlet of the liquid inlet channel 35 of the power motor 30. With such a configuration, the radiator 40 can dissipate the heat of the cooling medium output from the liquid outlet 315, so that when the cooling medium flows back into the liquid cooling chamber 310a through the liquid inlet channel 35 and the liquid supply channel 34, it can continue to take away the heat of the coil winding 331, dissipate the heat of the coil winding 331, and improve the utilization rate of the cooling medium.

[0264] See also Figure 2 As shown, in some embodiments, the electric motor 21 further includes a fan 50. For example, the fan 50 is disposed on a side of the power motor 30 away from the propeller 22. Figure 2 As shown in , the fan 50 can be located on the side of the radiator 40 facing the power motor 30. The fan 50 is used to perform air cooling and heat dissipation on the radiator 40.

[0265] Fig.25 and Fig.26 Schematic diagrams of the structure of the liquid pump 60 at different viewing angles are shown.

[0266] See also Fig.25 and Fig.26 As shown, in some embodiments, the electric engine 21 may further include a liquid pump 60. The liquid pump 60 may be disposed on the power motor 30.

[0267] See also Fig.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 connected to the outlet of the radiator 40, so that the liquid outlet 315 of the power motor 30 is connected to the medium inlet 61 of the liquid pump 60 through the radiator 40. The medium outlet 62 of the liquid pump 60 is connected to the inlet of the liquid inlet channel 35 of the power motor 30, so that the cooling medium output from the liquid outlet 315 can flow back to the liquid inlet channel 35 again under the action of the liquid pump 60 after the cooling is dissipated by the radiator 40, so as to realize the circulation of the cooling medium and further improve the utilization rate of the cooling medium.

[0268] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power motor, characterized in that: Including stator; The stator comprises a support assembly (31), a stator core assembly (32) and a stator winding assembly (33) wound on the stator core assembly (32); the support assembly (31) has a liquid cooling cavity (310a); the stator core assembly (32) and the stator winding assembly (33) are arranged in the liquid cooling cavity (310a); The support assembly (31) also has a liquid supply channel (34), a bypass channel (36) and a liquid inlet channel (35); The liquid supply channel (34) comprises at least two liquid supply sections (341) distributed along the circumference of the stator core assembly (32), and the liquid supply sections (341) are connected to the liquid cooling cavity (310a); The inlet of one of the at least two liquid supply sections (341) is connected to the outlet of the liquid inlet channel (35), the inlet of the other of the at least two liquid supply sections (341) is connected to the bypass channel (36), and the inlet of the bypass channel (36) is connected to the liquid inlet channel (35); The cooling medium in the liquid cooling chamber (310a) is in direct contact with the stator core assembly (32) and the stator winding assembly (33).

2. The power motor according to claim 1, characterized in that: The liquid supply section (341) extends circumferentially along the outer side of the stator core assembly (32); a flow channel wall of the liquid supply section (341) has a plurality of liquid supply ports (342) spaced apart along an extending direction of the liquid supply section (341); and the liquid supply section (341) is connected to the liquid cooling chamber (310a) via the liquid supply ports (342).

3. The power motor according to claim 2, characterized in that: In the same section of the liquid supply section (341), the flow area of ​​the liquid supply port (342) gradually increases in a direction from an inlet close to the liquid supply section (341) to an inlet far away from the liquid supply section (341).

4. The power motor according to claim 2, characterized in that: In the extension direction of the liquid supply section (341), the inlet of the liquid supply section (341) is located in the middle of the liquid supply section (341), and the liquid supply ports (342) are provided on the flow channel walls on both sides of the inlet of the liquid supply section (341).

5. The power motor according to any one of claims 1 to 4, characterized in that: In the radial direction of the stator core assembly (32), the liquid inlet channel (35) is located on a side of the liquid supply channel (34) and the bypass channel (36) away from the liquid cooling chamber (310a); The opening direction of the outlet of the liquid inlet channel (35) is along the radial direction of the stator core assembly (32) and is oriented toward the liquid cooling cavity (310a).

6. The power motor according to any one of claims 1 to 4, characterized in that: In the extension direction of the liquid supply channel (34), at least two adjacent liquid supply sections (341) are arranged separately.

7. The power motor according to any one of claims 1 to 4, characterized in that: The support assembly (31) further comprises a first sub-flow guiding channel (3721), wherein the first sub-flow guiding channel (3721) extends along the axial direction of the stator core assembly (32); For the liquid supply section (341) whose inlet is connected to the outlet of the liquid inlet channel (35): the outlet of the liquid inlet channel (35) is connected to the inlet of the first sub-flow guiding channel (3721), and the outlet of the first sub-flow guiding channel (3721) is connected to the inlet of the liquid supply section (341).

8. The power motor according to any one of claims 1 to 4, characterized in that: The bypass flow channel (36) extends along the outer circumference of the stator core assembly (32), and the bypass flow channel (36) and the liquid supply flow channel (34) are arranged in sequence along the axial direction of the stator core assembly (32).

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

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

11. The power motor according to any one of claims 1 to 4, characterized in that: The liquid inlet channel (35) comprises a first port (351) and a second port (352); For the liquid supply section (341) whose inlet is connected to the outlet of the liquid inlet channel (35): the first port (351) is connected to the inlet of the liquid supply section (341); The second port (352) is in communication with the inlet of the bypass flow channel (36); The flow area of ​​the first port (351) is smaller than the flow area of ​​the second port (352); The flow area of ​​the liquid supply section (341) whose inlet is connected to the outlet of the liquid inlet channel (35) is greater than or equal to the flow area of ​​the first port (351), and / or the flow area of ​​the bypass channel (36) and the liquid supply section (341) connected to the bypass channel (36) is greater than or equal to the flow area of ​​the second port (352).

12. The power motor according to any one of claims 1 to 4, characterized in that: The at least two liquid supply sections (341) include a first liquid supply section (341a) and a second liquid supply section (341b); The inlet of the first liquid supply section (341a) is in communication with the outlet of the liquid inlet channel (35), and the inlet of the second liquid supply section (341b) is in communication with the bypass channel (36); The first liquid supply section (341a) and the second liquid supply section (341b) are arranged opposite to each other along the radial direction of the stator core assembly (32); and / or, The inlet of the first liquid supply section (341a) and the inlet of the second liquid supply section (341b) are arranged opposite to each other along the radial direction of the stator core assembly (32).

13. The power motor according to any one of claims 1 to 4, characterized in that: The support assembly (31) comprises a stator support (311), a first stop cover (312), a second stop cover (313) and a sleeve (314); The stator core assembly (32) is sleeved on the radial outer side of the stator bracket (311), and the sleeve (314) is sleeved on the radial outer side of the stator core assembly (32); The first stop cover (312) is covered on one end of the sleeve (314) and the stator support (311), and the first stop cover (312) is sealedly connected to the sleeve (314) and the stator support (311); The second blocking cover (313) is covered on the other end of the sleeve (314) and the stator bracket (311), and the second blocking cover (313) is sealedly connected to the sleeve (314) and the stator bracket (311); The stator support (311), the sleeve (314), the first blocking cover (312) and the second blocking cover (313) are used to enclose and form the liquid cooling chamber (310a); the liquid supply channel (34), the liquid inlet channel (35) and the bypass channel (36) are located on the stator support (311).

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

15. An electric propulsion device, characterized in that: comprising a propeller (22) and an electric motor as claimed in claim 14; The electric motor is drivingly connected to the propeller (22).

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

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