Power machines, electric engines, electric propulsion systems and aircraft

Abstract

The power motor, the electric motor, the electric propulsion system and the aircraft of the application, the power motor comprises a medium cavity, a medium input unit and a medium output unit, the medium cavity is arranged on the medium input unit and is used for installing the stator winding; the medium input unit is provided with two independent medium inlets, and the two medium inlets are used for guiding the cooling medium into the medium cavity; the medium output unit is provided with two independent medium outlets, and the two medium outlets are used for discharging the cooling medium passing through the medium cavity; wherein, in the circumferential direction of the preset circle, the medium inlets and the medium outlets are alternately arranged; and the included angle between the first center connecting line L1 of the two medium inlets and the second center connecting line L2 of the two medium outlets is 90° or the minimum included angle is less than 45°. In this way, the flow path of the cooling medium flowing in the power motor can be shortened, the flow resistance is reduced, and the uniformity of the cooling medium flow distribution is also improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aircrafts, and particularly relates to a power motor, an electric engine, an electric propulsion system and an aircraft. BACKGROUND

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

[0003] The heat of the power motor is mainly concentrated at the position of the stator winding. However, the layout of the cooling flow channel in the stator winding is currently unreasonable, which leads to poor heat dissipation uniformity of the stator winding, so that the temperature field of the stator winding is unevenly distributed, thereby causing local overheating problem. SUMMARY

[0004] Therefore, it is necessary to provide a power motor, an electric engine, an electric propulsion system and an aircraft, which change the layout of the cooling medium flow channel to improve the heat dissipation uniformity of the stator winding, thereby solving the problem of local overheating of the stator winding.

[0005] The application provides a power motor, which comprises:

[0006] A medium cavity is arranged on the medium cavity body, and the medium cavity is used to mount a stator winding;

[0007] A medium input unit is arranged on the medium cavity body, and two independent medium inlets are arranged on the medium input unit, the two medium inlets are respectively connected to the medium cavity, and the medium input unit is used to guide cooling medium into the medium cavity;

[0008] A medium output unit is arranged on the medium cavity body, and two independent medium outlets are arranged on the medium output unit, the two medium outlets are respectively connected to the medium cavity, and the medium output unit is used to discharge the cooling medium passing through the medium cavity;

[0009] In this configuration, the medium inlets and the medium outlets are alternately arranged along the circumference of a preset circle; and the first center connection line between the two medium inlets is set as L1, and the second center connection line between the two medium outlets is set as L2; ​​wherein the included angle between the first center connection line L1 and the second center connection line L2 is 90°; or, the minimum included angle between the first center connection line L1 and the second center connection line L2 is less than 45°.

[0010] Understandably, by employing two media inlets and outlets alternately distributed in the circumferential direction, the cooling medium can enter the media chamber synchronously through the two inlets and exit through the two outlets during operation. This configuration not only shortens the flow path of the cooling medium within the motor and reduces flow resistance, but also helps improve the uniformity of the medium flow distribution entering the cooling chamber. This, in turn, improves the heat dissipation uniformity and temperature distribution consistency of the stator windings, ultimately enhancing the motor's heat dissipation capacity and operational stability under high-power conditions.

[0011] In one embodiment, the two media inlets are arranged in a centrally symmetrical manner with the center of the preset circle as the center of symmetry, and the two media outlets are arranged in a centrally symmetrical manner with the center of the preset circle as the center of symmetry.

[0012] In one embodiment, each of the medium inlets is connected to the medium cavity through a plurality of input holes, and the plurality of input holes are spaced apart along the circumferential direction;

[0013] The variance of the cooling medium flow rate from the medium input unit to the medium cavity through the input port is set to V1, where 0 < V1 < 1.54 × 10⁻⁶. -6 .

[0014] In one embodiment, each of the media inlets is connected to its corresponding plurality of input holes via a media input cavity;

[0015] The medium input cavity includes multiple medium channels, which are connected to the input port. The multiple medium channels are arranged along the circumferential direction, and a throttling channel is provided between two adjacent medium channels.

[0016] It is understandable that by using a throttling channel on the medium input cavity, the flow rate of the cooling medium flowing through the throttling channel to the input hole can be regulated and distributed. This can improve the uniformity of the cooling medium flow rate from the medium input unit to the medium cavity, which is beneficial to eliminating the flow rate deviation between different input holes in the medium input unit. This, in turn, helps to improve the temperature uniformity of the stator winding and further enhances the uniformity of heat dissipation and temperature distribution of the stator winding during the operation of the power motor.

[0017] In one embodiment, the apertures of the plurality of input holes communicating with each of the media inlets are differentially distributed along the circumferential direction.

[0018] It is understandable that the cooling medium introduced through each medium inlet flows into the medium cavity through input holes with different apertures. This can compensate for the flow deviation caused by uneven total pressure distribution and structural features, so as to promote the uniformity of the flow distribution of each input hole in the medium input cavity, thereby helping to improve the temperature uniformity of the stator winding and further improving the heat dissipation uniformity and temperature distribution consistency of the stator winding when the power motor is working.

[0019] In one embodiment, each medium inlet is connected to its corresponding plurality of input holes via a medium input cavity; and the medium input unit is provided with a positioning part at the position of each medium input cavity, the positioning part being used to position the stator winding.

[0020] Furthermore, along the circumferential direction, the medium input cavity is configured with at least three sequentially arranged regions, A, B, and C. The medium inlet is located in region A, and the positioning part is located in region B. The aperture of the input hole in region A is configured as D1, and the aperture of the input hole in region C is configured as D3, and D1 and D3 satisfy D1 < D3.

[0021] In this configuration, the number of input holes in region B is at least two, and the diameter of the input hole closer to region A in region B is set to D. 21 The diameter of the input hole near region C is set to D. 22 And D 21 and D 22 Satisfy D 21 <D 22 .

[0022] In one embodiment, at least a portion of the input holes in region A are configured with an aperture of D. 12 And D 12 With D 21 Satisfy D 12 =D 21 ;

[0023] And / or, at least a portion of the input holes in region C are configured with an aperture of D. 32 And D 32 With D 22 Satisfy D 32 =D 22 .

[0024] It is understandable that making the diameter of the input hole in region B consistent with that in regions A and / or C would reduce the variety of input hole diameters in region B. This configuration allows the medium input cavity to simplify the processing technology and improve production efficiency while ensuring the uniformity of liquid output from the input hole in region B, thus possessing good engineering application prospects and economic benefits.

[0025] In one embodiment, along the circumferential direction, region A includes at least region A1 and region A2, with region A1 located further away from region B than region A2, and the medium inlet located in region A2; the aperture of the inlet in region A1 is configured as D. 11 The aperture of the input hole in region A2 is configured as D. 12 And D 11 and D 12 Satisfy D 11 >D 12 .

[0026] Understandably, setting the orifice diameter of the input orifice farther from the medium inlet in region A to a larger size can effectively compensate for the pressure loss along the flow path of the cooling medium in region A, thereby improving the uniformity of liquid discharge from each input orifice in region A.

[0027] In one embodiment, along the circumferential direction, region C includes at least region C1 and region C2, with region C2 located further away from region B than region C1; the aperture of the input hole in region C1 is configured as D. 31 The aperture of the input hole in region C2 is configured as D. 32 And D 32 and D 31 Satisfy D 32 >D 31 .

[0028] Understandably, setting the orifice diameter of the input orifice farther from the medium inlet in region C to be larger can effectively compensate for the pressure loss along the flow path of the cooling medium in region C, thereby improving the uniformity of liquid discharge from each input orifice in region C.

[0029] In one embodiment, each of the media outlets is connected to the media cavity through a plurality of output holes, and the plurality of output holes are spaced apart along the circumferential direction and are connected to their corresponding media outlets through a media output cavity.

[0030] All output holes connected to each of the media outlets are assigned to at least two independent output hole groups; and in the circumferential direction, the media outlet is located at the end of the media output cavity, and the media outlet is respectively connected to at least two of the output hole groups.

[0031] It is understandable that dividing all the output holes connected to each medium output chamber into at least two independent output hole groups, and allowing the cooling medium introduced into the medium output chamber by each output hole group to flow independently to the medium outlet; this setting can effectively improve the smoothness of the cooling medium flow in the medium output chamber, thereby significantly increasing the overall liquid flow rate of the medium output chamber, while also helping to reduce the overall pressure loss of the power motor, reduce the workload of the oil pump controlling the medium inlet, and ultimately achieve a dual improvement in the operating efficiency and service life of the power motor.

[0032] In one embodiment, the medium output cavity includes at least two output channels, and the at least two output channels are respectively arranged in a one-to-one correspondence with at least two output hole groups, and each output hole group is respectively connected to the corresponding output channel;

[0033] The medium outlet is simultaneously connected to all of the output channels.

[0034] Understandably, by setting the medium output chamber as multiple independent output channels, each output orifice group has its own dedicated flow path; this setting can effectively avoid flow interference and pressure imbalance between the output orifice groups; at the same time, the medium outlet is directly connected to all output channels, which achieves a compact and integrated design of the medium output chamber structure while ensuring smooth liquid discharge.

[0035] In one embodiment, at least two of the output channels are located on different circumferences.

[0036] This application also provides an electric motor, which includes a radiator, a cooling fan, and the power motor described above.

[0037] The radiator is connected to both the medium inlet and the medium outlet; the cooling fan is used to provide air cooling for the radiator.

[0038] This application also provides an electric propulsion system, which includes the power motor described above;

[0039] Alternatively, it may include a propeller and the aforementioned electric motor, wherein the electric motor is drivenly connected to the propeller to provide power to the propeller.

[0040] This application also provides an aircraft, which includes the aforementioned power motor;

[0041] Alternatively, it may include the electric motors described above;

[0042] Alternatively, it may include the electric propulsion system described above.

[0043] In one embodiment, the aircraft is configured as an electric vertical takeoff and landing (EVTOL) aircraft.

[0044] In one embodiment, the aircraft further includes a fixed rotor and / or a tilt rotor, and the electric motor is drivenly connected to the fixed rotor and / or the tilt rotor to provide power to the corresponding fixed rotor or the tilt rotor.

[0045] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0046] The electric motor, electric motor, electric propulsion system, and aircraft claimed in this application employ two circumferentially alternating medium inlets and outlets. This design allows the cooling medium to simultaneously enter the medium chamber through the two inlets and exit through the two outlets during operation. This configuration not only shortens the flow path of the cooling medium within the motor and reduces flow resistance, but also improves the uniformity of the medium flow distribution into the cooling chamber. This, in turn, enhances the heat dissipation uniformity and temperature distribution consistency of the stator windings, ultimately strengthening the motor's heat dissipation capacity and operational stability under high-power conditions. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a structural schematic diagram of the aircraft provided in this application.

[0049] Figure 2 This is a schematic diagram of the structure of the stator winding cooling channel in the power motor provided in this application.

[0050] Figure 3 for Figure 2A structural diagram from another perspective.

[0051] Figure 4 This is another structural schematic diagram of the stator winding cooling channel in the power motor provided in this application.

[0052] Figure 5 This is a schematic diagram of the structure of the media input unit provided in this application.

[0053] Figure 6 This is another structural schematic diagram of the media input unit provided in this application.

[0054] Figure 7 for Figure 6 A structural diagram from another perspective.

[0055] Figure 8 This is a schematic diagram showing the ratio of the diameter of each input orifice connected to a medium input cavity to the average diameter of the input orifices.

[0056] Figure 9 This is a simulation diagram of the flow rate of each input orifice with the same diameter in the medium input unit.

[0057] Figure 10 The simulation diagram shows the flow rate of each input port in the medium input unit provided in this application.

[0058] Figure 11 This is another flow simulation diagram of each input port in the medium input unit provided in this application.

[0059] Figure 12 This is a partial schematic diagram of the media input unit of this application being assembled with the stator winding via the positioning part.

[0060] Figure 13 This is a schematic diagram showing the flow of the cooling medium in the medium input cavity of this application as it passes through the positioning section.

[0061] Figure 14 This is a schematic diagram of the structure of the media output unit of this application.

[0062] Figure 15 This is a schematic diagram of a medium output cavity provided in this application.

[0063] Figure 16 This is a schematic diagram showing the flow of cooling medium in the stator winding cooling channel of the power motor provided in this application.

[0064] Figure 17 This is another schematic diagram showing the flow of cooling medium in the stator winding cooling channel of the power motor provided in this application.

[0065] Figure 18This is a partial structural diagram of the assembly of the media input unit and the media cavity provided in this application.

[0066] Figure 19 This is a partial structural diagram of the assembly of the medium input unit and the stator winding provided in this application.

[0067] Figure 20 This is a partial structural diagram of the assembly of the media output unit and the media cavity provided in this application.

[0068] Figure 21 This is a schematic diagram of the electric propulsion system provided in this application.

[0069] Figure 22 This is a schematic diagram of the electric motor provided in this application.

[0070] Reference numerals: 1000, power motor; 100, medium input unit; 110, medium input cavity; 110a, connecting part; 1101, medium channel; 111, medium inlet; 112, input hole; 113, positioning part; 114, throttling channel; 120, medium inlet pipe; 200, medium cavity; 210, medium cavity; 300, medium output unit; 310, medium output cavity; 3101, output channel; 311, medium outlet; 312, output hole; 3120, output hole group; 320, medium outlet pipe; 400, stator winding; 2000, aircraft; 2100, electric propulsion system; 2110, electric motor; 2111, radiator; 2112, cooling fan; 2120, propeller; 2200, fuselage; 2300, wing; 2400, tail. Detailed Implementation

[0071] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0072] It should be noted that when a component is said to be "located on" another component, it can be directly located on the other component or may have an intervening component. When a component is considered to be "located on" another component, it can be directly located on the other component or may have an intervening component. When a component is considered to be "fixed to" another component, it can be directly fixed to the other component or may have an intervening component.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0074] Please see Figures 1 to 20 This application provides a power motor 1000, which is mainly used on an aircraft 2000 and serves as the power source for the movement of the aircraft 2000. Here, the aircraft 2000 can be an electric vertical take-off and landing (eVTOL) aircraft.

[0075] Please see Figures 2 to 4 The power motor 1000 includes a medium cavity 200, a medium input unit 100, and a medium output unit 300. The medium cavity 200 has a medium chamber 210 for mounting the stator winding 400. The medium input unit 100 has two independent medium inlets 111, each connected to the medium chamber 210, for introducing cooling medium into the medium chamber 210. The medium output unit 300 has two independent medium outlets 311, each connected to... A medium cavity 210 is used to discharge cooling medium passing through the medium cavity 210; wherein, in the circumferential direction of a preset circle, a medium inlet 111 and a medium outlet 311 are alternately arranged; and, the first center connection line of the two medium inlets 111 is set as L1, and the second center connection line of the two medium outlets 311 is set as L2; ​​wherein, the included angle between the first center connection line L1 and the second center connection line L2 is 90°; or, the minimum included angle between the first center connection line L1 and the second center connection line L2 is less than 45°.

[0076] Typically, electric vertical takeoff and landing (EVTOL) aircraft require components to be small and precise while ensuring performance in order to meet weight and space constraints. Using heat dissipation channels from related fields to cool the motor would result in a larger electric motor size and would not meet the motor's cooling requirements. Furthermore, the motor is a high-power, high-heat-generating moving part, and cooling remains a significant factor restricting the development of high-torque-density and high-power-density motors.

[0077] In related technologies, there are significant problems with the design of the flow path for the stator cooling medium, resulting in excessively long flow paths. This leads to poor cooling uniformity of the stator windings and stator core, causing uneven temperature distribution and resulting in localized overheating. During actual cooling of the stator windings, some cooling oil may have excessively long flow paths and significantly increased flow resistance, further affecting the uniformity of heat dissipation in the stator windings of the power motor. This problem can lead to uneven temperature distribution in the stator windings and the risk of localized overheating, ultimately limiting the overall heat dissipation efficiency and long-term operational reliability of the power motor.

[0078] It is understood that the power motor 1000 of this application employs two media inlets 111 and media outlets 311 that are alternately distributed in the circumferential direction. This allows the cooling medium to simultaneously enter the media cavity 210 through the two media inlets 111 and then exit through the two media outlets 311 during operation. This arrangement not only shortens the flow path of the cooling medium inside the power motor 1000 and reduces flow resistance, but also helps to improve the uniformity of the medium flow distribution entering the media cavity 210. This improves the heat dissipation uniformity and temperature distribution consistency of the stator winding 400, ultimately enhancing the heat dissipation capacity and operational stability of the power motor 1000 under high-power conditions.

[0079] It should be noted that when the angle between the first center connecting line L1 and the second center connecting line L2 is 90°, the two medium inlets 111 and the two medium outlets 311 in the power motor 1000 of this application are arranged in a cross shape perpendicularly. This further shortens the overall flow path of the cooling medium in the power motor 1000 while meeting the requirements of the integrated electronic control unit, which helps to reduce the flow resistance of the cooling medium and thus helps to improve the uniformity of heat dissipation of the stator winding 400 during the operation of the power motor. When the minimum angle between the first center connecting line L1 and the second center connecting line L2 between the two medium outlets 311 is less than 45°, the minimum angle between the first center connecting line L1 and the second center connecting line L2 can be set to 20°, 25°, 30°, 40°, 44°, etc.

[0080] Please see Figure 7 , Figure 18 and Figure 19 In this application, in the medium input unit 100, each medium inlet 111 is connected to a plurality of input holes 112 through the medium input cavity 110. The plurality of input holes 112 are spaced apart along the circumferential direction and are respectively configured to correspond one-to-one with a plurality of winding coils in the stator winding 400 within the medium cavity 210. This allows each medium inlet 111 to flow into the medium cavity 210 through the plurality of input holes 112 after being introduced into the medium input cavity 110.

[0081] Preferably, along the thickness direction of the medium input cavity 110, the medium inlet 111 is disposed on the inner side of the medium input cavity 110, and the input hole 112 is disposed on the outer side of the medium input cavity 110.

[0082] Here, the cooling medium can be a liquid medium such as coolant or insulating oil. In this application, coolant is used as the cooling medium as an example, and the structure of the power motor 1000 provided in the embodiments of this application will be further described in conjunction with the accompanying drawings and embodiments.

[0083] In one embodiment, based on the structural foundation of the power motor 1000, the medium input unit 100 and the medium cavity 200 are integrated on the stator support. Here, through this integrated layout, the entire cooling system is highly integrated into the power motor 1000, which greatly promotes the compactness and miniaturization of the overall structure of the power motor 1000, so as to meet the usage requirements of the power motor 1000 in the electric propulsion system 2100 of the aircraft 2000.

[0084] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of the media input unit 100 provided in this application. The media input unit 100 has two media input cavities 110, and the cavities corresponding to the two media input cavities 110 are independently arranged; furthermore, the cavities corresponding to the two media input cavities 110 together form a circular structure. Here, the cavity corresponding to the media input cavity 110 is specifically a shell structure that encloses and forms the corresponding media input cavity 110, which is a solid component. Of course, this is not limited to this; the number of media input cavities 110 in the media input unit 100 can also be configured as three, four, or more, and the specific number can be set according to actual needs, which will not be elaborated here.

[0085] Please see Figure 7 , Figure 7 This is another structural schematic diagram of the media input unit 100 provided in this application. The media input unit 100 also has two media input cavities 110, and the corresponding cavities of the two media input cavities 110 are connected as a single unit to form a circular ring structure. Of course, this is not the only possibility; the number of media input cavities 110 in the media input unit 100 can also be configured as three, four, or more, and the specific number can be set according to actual needs, which will not be elaborated here.

[0086] Here, the cavities corresponding to the two media input chambers 110 in the media input unit 100 can be respectively connected and fixed to the stator support (not shown) through their respective machined connecting parts 110a, thus realizing the assembly connection of the media input unit 100 on the stator support. The connecting part 110a can be a pre-installed part during the machining of the cavity corresponding to a single media input chamber 110 or a separately provided connecting plate. Of course, it is not limited to this; the connecting part 110a can connect the cavities corresponding to the two media input chambers 110 to the stator support as long as it can do so, and will not be elaborated further here.

[0087] Furthermore, the two media input cavities 110 and the two media inlets 111 are arranged in a centrally symmetrical manner, specifically with the center of the aforementioned preset circle as the center of symmetry. That is, the structures of the two media input cavities 110 in the media input unit 100 are completely identical. This arrangement allows the media input unit 100 to meet the needs of mass production by developing only one set of molds during the manufacturing process, effectively reducing production costs and significantly improving production efficiency.

[0088] In one embodiment, the main frame of the medium input cavity 110 is generally formed by casting, and the hole structures such as the medium inlet 111 and the input hole 112 can be formed by subsequent processes, such as stamping and drilling, to reduce the difficulty of the casting process.

[0089] Please continue reading. Figure 5 To further improve the uniformity of the cooling medium output flow rate at each input port 112 in the circumferential direction, the medium input cavity 110 includes multiple medium channels 1101. These channels are spaced apart along the circumferential direction, and a throttling channel 114 is provided between adjacent medium channels 1101. In other words, adjacent medium channels 1101 are connected through the throttling channel 114. This arrangement allows for the adjustment of the cooling medium flow rate or velocity using the throttling effect of the throttling channel 114, thereby controlling the flow rate of the cooling medium entering each medium channel 1101. This eliminates flow rate deviations between input ports 112 at different locations in each medium input cavity 110, thus helping to improve the temperature uniformity of the stator winding 400 and further enhancing the heat dissipation uniformity and temperature field distribution consistency of the stator winding 400 during operation of the power motor 1000.

[0090] Here, the throttling channel 114 is generally integrally formed during the casting of the cavity containing the medium input cavity 110. This reduces subsequent processing steps and effectively lowers processing complexity and manufacturing costs. Of course, without considering other factors, the throttling channel 114 can also be formed by stamping or extrusion.

[0091] Furthermore, the number of throttling channels 114 connecting two adjacent medium channels 1101 is configured to be multiple, and each throttling channel 114 is spaced apart along the width direction of the medium input cavity 110. This configuration allows for multi-point throttling regulation of the flow rate between two adjacent medium channels 1101, effectively buffering pressure fluctuations during the flow of cooling medium in the medium input cavity 110 to automatically compensate for flow rate deviations, thereby helping to ensure the stability of the cooling medium delivery flow rate.

[0092] It should be noted that the specific number of these multiple throttling channels 114 can be set to two, three, four, five, or six. Of course, it is not limited to these; the specific number of throttling channels 114 can be set according to actual needs, which will not be elaborated here.

[0093] Please see Figures 2 to 7 The medium input unit 100 is connected to a medium inlet pipe 120 at the medium inlet 111, through which the cooling medium is input. Specifically, the end of the medium inlet pipe 120 away from the medium inlet 111 is connected to a cooling medium pump, meaning that the cooling medium pumped out by the cooling medium pump is introduced into the medium inlet 111 through the medium inlet pipe 120. Here, the cooling medium pump is configured as an oil pump.

[0094] The medium inlet pipe 120 is bent, which provides good interface compatibility and layout flexibility for the connection between the medium input unit 100 and the oil pump in the power motor 1000. This facilitates the integrated assembly and layout optimization of the medium input cavity 110 in a limited space.

[0095] In this application, the variance of the cooling medium flow rate from the medium input unit 100 to the medium cavity 210 through the input port 112 is set to V1, where 0 < V1 < 1.54 × 10⁻⁶. -6 This configuration ensures the consistency of the cooling medium flow rate when it flows out of multiple input holes 112 by strictly controlling the flow rate dispersion of each input hole 112.

[0096] It should be noted that the closer the flow variance V1 is to 0, the smaller the flow difference between each input orifice 112, and the more uniform the flow distribution; while 0 < V1 < 1.54 × 10 -6 The limited range avoids the problem of excessive cooling medium supply in some areas and insufficient supply in others due to excessive flow variance, and can also adapt to the small flow fluctuations in actual working conditions. This helps the power motor 1000 to achieve uniform heat dissipation of the stator winding 400 when it is working, thereby helping to ensure the operating stability, heat dissipation efficiency and service life of the power motor 1000.

[0097] Here, the specific value of the aforementioned flow variance V1 can be 1.21 × 10⁻⁶. -6 0.74×10 -6 1.38×10 -7 0.69×10 -7 And so on. Of course, it is not limited to this; the value of V1 can be set according to actual needs, which will not be elaborated here.

[0098] Please see Figure 7 , Figure 8 and Figure 12 The orifice diameters of the multiple input holes 112 on the cavity containing the medium input chamber 110 are differentially distributed. In other words, the orifice diameters of the multiple input holes 112 are set to be different. Here, by configuring input holes 112 with different orifice diameters, the medium input chamber 110 can specifically compensate for the flow deviation caused by uneven total pressure distribution and differences in structural characteristics. This can improve the uniformity of the outlet flow distribution of each input hole 112, thereby helping to improve the temperature distribution uniformity of the stator winding 400, further optimizing the heat dissipation uniformity and temperature consistency of the stator winding 400 when the power motor 1000 is working, and providing a guarantee for the stable and efficient operation of the power motor 1000.

[0099] In related technologies, the cavity containing the medium input cavity 110 is assembled and positioned to the stator support by an external connector. This design not only fails to simplify the assembly operation of the medium input cavity 110 on the stator support, but also increases the complexity of the assembly process due to the additional setting of the connector. At the same time, the presence of the connector also increases the overall weight of the power motor 1000, which has an adverse effect on the lightweight design of the power motor.

[0100] Please continue reading. Figure 7 and Figure 12 In one embodiment, the medium input unit 100 is further provided with a positioning part 113 at the location of the medium input cavity 110. The positioning part 113 is used to position the output position of the stator winding 400. Specifically, the positioning part 113 is integrally formed on the cavity where the medium input cavity 110 is located, so that the positioning part 113 on the medium input unit 100 can be used to assemble and position the stator winding 400. This can improve the assembly accuracy of the medium input unit 100 when it is assembled on the stator winding 400, and avoid the weight increase problem caused by the setting of additional connecting parts, so as to meet the usage requirements of the stator bracket and stator winding 400 assembly and positioning in the power motor 1000.

[0101] It is understandable that the structural molding of the positioning part 113 on the cavity where the medium input cavity 110 is located will cause the cooling medium in the medium input cavity 110 to experience significant fluctuations when passing through the positioning part 113. Therefore, in the circumferential direction, the medium input cavity 110 of this application is provided with at least three sequentially arranged regions: region A, region B, and region C. The medium inlet 111 is located in region A, and the positioning part 113 is located in region B. The aperture of the input hole 112 in region A is configured as D1, and the aperture of the input hole 112 in region C is configured as D3, where D1 < D3. At least two input holes 112 are configured in region B, and in region B, the aperture of the input hole 112 closest to region A is set to D. 21 The aperture of input hole 112 near region C is set to D. 22 And D 21 and D 22 Satisfy D 21 <D 22 Here, the medium input cavity 110 is in the shape of a semi-circular ring.

[0102] It is understood that the medium input cavity 110 of this application can compensate for the flow deviation caused by uneven total pressure distribution and structural features by configuring input holes 112 with different apertures in each region, based on the total pressure distribution law in its three regions. This can promote the uniformity of the outlet flow distribution of each input hole 112 in the medium input cavity 110, help improve the temperature uniformity of the stator winding 400, and improve the heat dissipation performance and operating stability of the power motor 1000 under high power conditions.

[0103] Please see Figure 7 and Figure 8 In one embodiment, along the circumferential direction, region A includes at least region A1 and region A2, with region A1 located further away from region B than region A2. Medium inlet 111 is located in region A2. The aperture of inlet hole 112 in region A1 is configured as D. 11 The aperture of input hole 112 in area A2 is configured as D. 12 And D 11 and D 12 Satisfy D 11 >D 12 In other words, region A is divided into two sub-regions, and the inlet holes 112 further away from the medium inlet 111 in both sub-regions are configured with larger diameters. This configuration effectively compensates for the pressure loss along the flow path of the cooling medium within region A, thereby improving the uniformity of liquid discharge from each inlet hole 112 in region A.

[0104] Specifically, all input holes 112 in region A1 have the same diameter and are D. 11 In region A2, the diameters of all input holes 112 are also equal and are D.12 This configuration allows the medium input cavity 110 to improve the uniformity of liquid output from the input hole 112 in region A, while simplifying the processing technology and improving production efficiency, thus possessing good engineering application prospects and economic benefits.

[0105] It should be noted that the aperture D of the aforementioned input hole 112 11 and D 12 This is a lower-level limitation on the orifice diameter D1 of the input orifice 112 in region A, the purpose of which is to more clearly illustrate the further optimization design taken to improve the flow uniformity of the input orifice 112 in region A. Of course, in other embodiments, region A can be further divided into three, four or even more sub-regions in the circumferential direction. The specific number of sub-regions can be flexibly set according to the actual application requirements, which will not be elaborated here.

[0106] In this application, the medium input cavity 110 is semi-circular; and in the medium input cavity 110, the central angle corresponding to the A1 region is configured as β1, and β1 satisfies 0°<β1≤25°; the central angle corresponding to the A2 region is configured as β2, and β2 satisfies 20°<β2≤60°.

[0107] Here, when the number of media input cavities 110 in the media input unit 100 is configured to be two, the value of β1 is 25° and the value of β2 is 60°. Of course, it is not limited to this. When the number of media input cavities 110 in the media input unit 100 is configured to be three, four, or even more, the value of β1 corresponding to two media input cavities 110 can also be 10°, 15°, 20°, or 23°, and the value of β2 can be set to 25°, 30°, 45°, or 50°, etc. The specific values ​​of β1 and β2 can be set according to actual needs, and will not be elaborated here.

[0108] Furthermore, the diameter of the input hole 112 in region B is D. 21 The aperture D of the input hole 112 in region A2 12 Equal, that is, D 21 =D 12 This makes the aperture in region B be D. 21 The opening of the input hole 112 does not require the addition of different hole diameter specifications, which further simplifies the processing technology of the media input unit 100 and improves production efficiency.

[0109] Please continue reading. Figure 7 and Figure 8 In one embodiment, along the circumferential direction, region C includes at least region C1 and region C2, with region C2 located further away from region B than region C1; the aperture of the input hole 112 in region C1 is configured as D. 31The aperture of input hole 112 in region C2 is configured as D. 32 And D 32 and D 31 Satisfy D 32 >D 31 That is, region C is also divided into two sub-regions, and the inlet holes 112 farther from the medium inlet 111 in both sub-regions are set to have larger diameters. This setting can effectively compensate for the pressure loss along the flow path of the cooling medium in region C, thereby improving the uniformity of liquid discharge from each inlet hole 112 in region C.

[0110] Specifically, all input holes 112 in region C1 have the same diameter and are set to D. 31 In region C2, the diameters of all input holes 112 are equal and set to D. 32 This arrangement ensures that the medium input cavity 110 has only two types of input holes 112 in region C. This configuration allows the medium input cavity 110 to improve the uniformity of liquid output from the input holes 112 in region C, while also simplifying the manufacturing process and increasing production efficiency, demonstrating good engineering application prospects and economic viability.

[0111] It should be noted that the aperture D of the aforementioned input hole 112 31 and D 32 This is a lower-level limitation on the orifice diameter D3 of the input orifice 112 in region C, the purpose of which is to more clearly illustrate the further optimization design taken to improve the flow uniformity of the input orifice 112 in region C. Of course, in other embodiments, region C can be further divided into three, four or even more sub-regions in the circumferential direction. The specific number of sub-regions can be flexibly set according to the actual application requirements, which will not be elaborated here.

[0112] In this application, in the semi-circular medium input cavity 110, the central angle corresponding to the C1 region is configured as β4, and β4 satisfies 0°<β4≤45°; the central angle corresponding to the C2 region is configured as β5, and β5 satisfies 0°<β5≤40°.

[0113] Here, when the number of media input cavities 110 in the media input unit 100 is configured as two, the value of β4 is 45° and the value of β5 is 40°. Of course, in other embodiments, when the number of media input cavities 110 in the media input unit 100 is configured as three, four, or even more, the value of β4 corresponding to two media input cavities 110 can also be 25°, 30°, 40°, or 44°, and the value of β5 can be set to 15°, 20°, 35°, or 38°, etc. The specific values ​​of β4 and β5 can be set according to actual needs, and will not be elaborated here.

[0114] Furthermore, the diameter of the input hole 112 in region B is D. 22 The aperture D of the input hole 112 in region C2 32 Equal, that is, D 22 =D 32 This makes the aperture in region B be D. 22 The opening of the input hole 112 does not require the addition of different hole diameter specifications, which further simplifies the processing technology of the media input unit 100 and improves production efficiency.

[0115] In this application, in the semi-circular media input cavity 110, the central angle corresponding to the aforementioned region B is configured as β3, and β3 satisfies 0°<β3≤10°. Here, the value of β3 is 10°. Of course, it is not limited to this. When there are three, four, or even more media input cavities 110 in the media input unit 100, the value of β3 can also be 3°, 5°, or 8°. The specific value can be set according to actual needs, and will not be elaborated here.

[0116] Please continue reading. Figure 8 In one embodiment, the average aperture of all input holes 112 communicating with the medium input cavity 110 is set to D. A Where 0.85≤D 11 / D A ≤0.9; and / or, 0.75≤D 12 / D A ≤0.8; and / or, 1.1≤D 31 / D A ≤1.15; and / or, 1.25≤D 32 / D A ≤1.3. This allows the medium input cavity 110 to use a smaller aperture ratio (D) in the input hole 112, which is closer to the medium inlet 111. 12 / D A D 11 / D A This avoids concentrated flow of the cooling medium in this area; while the inlet hole 112, which is farther from the medium inlet 111, uses a larger aperture ratio (D). 32 / D A D 31 / D A This configuration enhances flow capacity. By using a ratio of four different orifice sizes, the outlet flow of the inlet holes 112 at different positions can be balanced. This significantly reduces the flow deviation between each inlet hole 112 and helps promote the uniformity of the flow of the cooling medium in the medium inlet cavity 110 as it flows out of each inlet hole 112.

[0117] Here, the above D 11 / D AThe value of can be 0.85, 0.88, 0.89, or 0.9; D 12 / D A The value of can be 0.75, 0.77, 0.78, 0.79, or 0.8; D 31 / D A The value of can be 1.1, 1.11, 1.13, or 1.15; D 32 / D A The value of can be 1.25, 1.26, 1.28, or 1.3. Of course, the above D... 11 / D A D 12 / D A D 31 / D A and D 32 / D A The specific value can be set according to actual needs, and will not be elaborated here.

[0118] Please continue reading. Figure 8 In this embodiment, in region B of the medium input cavity 110, 0.75 ≤ D 21 / D A ≤0.8; 1.25≤D 22 / D A ≤1.3.

[0119] Here, the above D 21 / D A The value of can be 0.75, 0.77, 0.78, 0.79, or 0.8; while D 22 / D A The value of can be 1.25, 1.26, 1.28, or 1.3. Of course, the above D... 21 / D A and D 22 / D A The specific value can be set according to actual needs, and will not be elaborated here.

[0120] Please continue reading. Figure 9 , Figure 9 This is a simulation diagram of the flow rate when the orifice diameters of the input holes in an existing annular medium input unit are uniform. To quantitatively evaluate the actual effect of the orifice diameter distribution strategy of the multiple input holes 112 connected to the medium input cavity 110, simulation tests were conducted on the flow rate of liquid exiting each input hole 112 corresponding to the medium input unit 100, and the results are as follows: Figure 10 , Figure 11As shown, the media input unit 100 of this application can effectively promote the consistency of flow rate in each input port 112. Furthermore, the flow rate variance of the input ports 112 is used as a uniformity evaluation index for measurement. The results show that after applying this dimensionless design, the flow rate variance of the media input cavity 110 is reduced from 1.54 × 10⁻⁶. -6 Reduced to 1.38×10 -7 The reduction was approximately 91%, which fully verified the effectiveness of the above-mentioned orifice diameter distribution strategy of input hole 112 in significantly improving the uniformity of liquid output from medium input unit 100.

[0121] Based on fluid mechanics theory and Bernoulli's equation, it is known that when the cooling medium flows in the medium inlet chamber 110, its total pressure drop decreases with increasing flow distance, leading to a decrease in flow capacity. Based on this principle, larger diameter inlet holes 112 are required in areas far from the medium inlet 111 for pressure compensation. Specifically, the inlet holes 112 at the end of the process, A1 and C2, have larger diameters. Meanwhile, in region B, the flow sudden expansion and separation caused by the positioning part 113 results in a particularly significant total pressure loss. Therefore, a sharp increase in the diameter of the inlet holes 112 is used to maintain the flow output of the inlet holes 112 in region B.

[0122] The relationship between the flow rate of inlet orifice 112 and its orifice diameter distribution is explained in detail below:

[0123] The cooling medium enters through the medium inlet 111 and flows into the medium cavity 210 within the medium chamber 200 via the inlet hole 112. When the cooling medium flows through the area of ​​the medium cavity 210 containing the stator winding 400, it directly contacts and exchanges heat with the stator winding 400, thereby directly removing the heat generated by the stator winding 400 during operation. This direct contact cooling method primarily achieves heat dissipation through convection heat transfer, and its convection heat transfer efficiency mainly depends on the convection heat transfer coefficient h and the heat transfer area A. widing Assume the heat generated by the 400 ohm stator winding is q, and the heat transfer area is A. widing and the temperature t when the cooling medium flows in. ∞ All are the same, to ensure a stator winding temperature of 400°C. w Consistency requires ensuring that the convective heat transfer coefficient h is the same in all parts. According to the convective heat transfer equation:

[0124] ;

[0125] When the physical properties of a fluid are determined, the convective heat transfer coefficient h is mainly affected by the fluid velocity V. For cooling media, the flow rate is the product of the flow velocity and the cross-sectional area of ​​the channel. Under the condition of a fixed flow area, the convective heat transfer coefficient h is mainly affected by the flow rate. Therefore, it is necessary to keep the flow rate of the cooling medium flowing through the stator winding 400 consistent.

[0126] To achieve uniform flow rate, the outlet flow rate of each inlet 112 needs to be controlled. According to Bernoulli's equation, the flow rate Q can be expressed as:

[0127] ;

[0128] Wherein, Pt2 is the total inlet pressure of input port 112, P ɑ The static pressure at the outlet of inlet 112 is ρ, where ρ is the density of the cooling medium, and A is the static pressure at the outlet of inlet 112. hole Let P be the area of ​​the input hole 112. Since the cooling medium mainly flows axially within the medium cavity 210 where the stator winding 400 is located, the circumferential flow can be ignored. Therefore, the circumferential static pressure P can be reasonably assumed. ɑ The flow rate Q is uniform. Therefore, it depends only on the total inlet pressure Pt2 of each orifice. If there are differences in Pt2, it is necessary to adjust the cross-sectional area A of the input orifice 112. hole This keeps the flow Q consistent.

[0129] To further determine the distribution pattern of Pt2, this invention simplifies the flow decomposition within the medium input cavity 110 into two pipe flow segments (regions A1 and A2, and regions C1 and C2) and a contraction-expansion channel (region B).

[0130] In regions A1 and A2, and regions C1 and C2, according to Bernoulli's equation, since the total pressure Pt1 at medium inlet 111 is a constant, the total pressure Pt2 at inlet 112 can be expressed as:

[0131] ;

[0132] Among them, h w The loss along the route, according to the Darcy-Wiesbach equation, can be expressed as:

[0133] ;

[0134] Where L is the distance from the medium inlet 111, d is the pipe diameter of the medium input cavity 110 for the cooling medium to flow through, V is the flow velocity of the cooling medium, g is the gravitational acceleration, and f is the Darcy friction coefficient (a function of the Reynolds number Re).

[0135] Loss along the way h w As the channel length L increases, Pt2 decreases accordingly. Region A1 is farther from the medium inlet 111 than region A2, has a lower total pressure, and weaker flow capacity, requiring a larger orifice 112. Similarly, the orifice 112 in region C2 also needs a larger orifice than that in region C1.

[0136] In region B, the presence of the positioning part 113 creates contraction and expansion channels, resulting in a complex flow state and two sudden expansion processes, each causing a total pressure loss. The total pressure loss ΔPt can be estimated using the formula for sudden expansion flow theory.

[0137] ;

[0138] Where AR is the expansion area ratio. When AR=2, ΔPt=ρV² / 8, indicating a significant total pressure loss. Therefore, the total pressure drops sharply near the outlet of the positioning section 113, and the flow velocity decreases. It is necessary to significantly increase the diameter of the inlet orifice 112 in this area to compensate for the flow rate and maintain overall uniformity.

[0139] As can be seen from the above, the medium input cavity 110 of this application has an integrated positioning part 113 on the cavity. The positioning part 113 is not only used to transmit circumferential static load and impact load, but also provides a precise positioning and assembly reference for the assembly between the medium input unit 100 and the stator winding 400, which significantly improves the structural rigidity and assembly convenience of the medium input cavity 110.

[0140] Please see Figure 13 , Figure 13 This is a schematic diagram showing the flow of the cooling medium through the positioning section in the medium input cavity 110. Figure 13 In the diagram, arrows are used to visualize the flow field, where the arrow direction indicates the flow direction and the arrow length indicates the flow velocity. During actual flow, when the cooling medium flows through the positioning section 113 in region B, significant flow separation occurs at the outlet region of the positioning section 113, forming a local low-velocity zone and a backflow vortex, resulting in a significant increase in total pressure loss in this region. This uneven distribution of total pressure manifests specifically as follows: the cooling medium velocity decreases in the inlet hole 112 near the outlet side of the positioning section 113, while the velocity is relatively higher in the inlet hole 112 near the inlet side. This significant velocity difference further exacerbates the overall flow inhomogeneity.

[0141] To compensate for the non-uniformity of cooling medium flow in region B, this invention specifically designs the aperture of the input hole 112 within region B (corresponding to a central angle of 85° to 95° on the medium input cavity 110), making the aperture of the input hole 112 on the outlet side of the positioning part 113 significantly larger than the aperture of the input hole 112 on the inlet side. In this application, the aperture of the input hole 112 at the inlet of the positioning part 113 is compared with the average aperture D of all input holes 112. A The ratio is 0.78, while the average aperture D of all input holes 112 is 0.78. AThe ratio is increased to 1.26. With this optimization, although there is still a total pressure difference between the input holes 112 at the inlet and outlet of the positioning part 113, the flow difference between the two is controlled within about 2%, thereby significantly improving the uniformity of the flow distribution of each input hole.

[0142] Therefore, the media input unit 100 provided in this application successfully achieves a compact and lightweight structure of the cavity where the media input cavity 110 is located by integrating the positioning part 113 into the cavity. More importantly, this innovative design perfectly balances and improves assembly convenience, structural reliability, and cooling uniformity without negatively impacting the overall flow uniformity of the media input cavity 110, fully demonstrating the effective balance achieved by this application among multiple performance indicators.

[0143] Please refer to it again. Figure 14 and Figure 15 In this application, in the medium output unit 300, each medium outlet 311 is connected to a plurality of output holes 312 through the medium output cavity 310. The plurality of output holes 312 are distributed at intervals along the circumferential direction, and the cooling medium in the medium cavity 210 can be discharged into the medium output cavity 310 through the plurality of output holes 312 and then discharged from the medium outlet 311.

[0144] Please refer to the previous document. Figure 14 In one embodiment, the number of media output cavities 310 is configured as two; of course, in other embodiments, the number of media output cavities 310 may be three or four, which will not be elaborated here.

[0145] Specifically, the two media output cavities 310 and the two media outlets 311 are arranged in a centrally symmetrical structure. Specifically, the central symmetry is achieved with the center of the aforementioned preset circle as the center of symmetry. That is, the structures of the two media output cavities 310 in the media output unit 300 are completely identical, so as to facilitate the processing and forming of the two media output cavities 310 on the rear end cover of the motor.

[0146] Please refer to the previous document. Figure 15 In one embodiment, the medium output cavity 310 is connected to a medium outlet pipe 320 at the medium outlet 311. The medium outlet pipe 320 is used to allow the medium to flow out of the medium outlet 311, thereby realizing the extraction of the medium. Here, the medium outlet pipe 320 is a straight pipe, which provides good interface adaptability and layout flexibility for the output and connection of the subsequent cooling medium in the medium output cavity 310, facilitating the integration and installation of the power motor 1000 within the limited space of the electric motor 2110.

[0147] The medium outlet pipe 320 and the cavity containing the medium output chamber 310 can be connected by means of welding, snap-fit, or plug-in. In this embodiment, the medium outlet pipe 320 and the cavity containing the medium output chamber 310 can be connected by welding.

[0148] Please see Figure 14 , Figure 14 This is a schematic diagram of the structure of the media output unit 300. In one embodiment, the media output unit 300 has two relatively independently arranged media output cavities 310, each of which is connected to a media outlet 311 and multiple output holes 312. It should be noted that... Figure 14 To clearly demonstrate the structure of the internal components of the media output unit 300, the two independent media output cavities 310 are drawn separately in the illustration.

[0149] In related technologies, the cooling medium introduced through the output hole 312, which is far from the medium outlet 311, will be affected by the flow interference of the output hole 312, which is closer to the outlet, resulting in uneven flow distribution of each output hole 312 in the medium output cavity 310, thus affecting the overall flow uniformity.

[0150] For this purpose, please refer to Figure 15 , Figure 15 This is a schematic diagram of the medium output cavity 310. In one embodiment, the medium outlet 311 is located at one end of the medium output cavity 310 in the circumferential direction; and, in the circumferential direction, all the output holes 312 in the medium output cavity 310 are combined to form two independent output hole groups 3120, so that the cooling medium introduced into the medium output cavity 310 by each output hole group 3120 flows independently to the medium outlet 311. This arrangement can effectively improve the flow smoothness of the cooling medium in the medium output cavity 310, thereby significantly increasing the overall liquid flow rate of the medium output cavity 310. At the same time, it also helps to reduce the overall pressure loss of the power motor 1000, reduce the workload of the oil pump controlling the medium inlet 111, and thus improve the operating efficiency and service life of the power motor 1000.

[0151] Please see Figure 15 and Figure 20Each media output cavity 310 includes at least two output channels 3101, and a media outlet 311 is connected to all output channels 3101. Each of the at least two output channels 3101 corresponds to at least two output orifice groups 3120, with each orifice group 3120 located on its corresponding output channel 3101. In other words, by configuring the media output cavity 310 on at least two independent output channels 3101, each output orifice group 3120 has its own dedicated flow path, effectively avoiding flow interference and pressure unevenness between the various output orifice groups 3120. Simultaneously, the media outlet 311 is directly connected to all output channels 3101, ensuring smooth liquid discharge while achieving a compact and integrated cavity structure for the media output cavity 310.

[0152] Here, at least two output channels 3101 are located on different circumferences.

[0153] It should be noted that in this application, the number of output channels 3101 is configured as two. Of course, those skilled in the art will know that the number of output channels 3101 in the medium output cavity 310 can also be three, four, or even more, which will not be elaborated here.

[0154] Please see Figures 16 to 20 The flow and heat dissipation process of the cooling medium during operation of the power motor 1000 of this application is as follows: First, the cooling medium pump pumps the cooling medium into the medium input cavity 110 through the medium inlet pipe 120. Then, the cooling medium flows directionally within the medium input cavity 110. After the cooling medium reaches the designated position, it flows out from each input hole 112 connected to the medium input cavity 110 to be introduced into the medium cavity 210 of the medium cavity 200. Specifically, the cooling medium flowing out from each input hole 112 can be directed towards one coil winding in the stator winding 400 within the medium cavity 210. In this way, the cooling medium can simultaneously absorb the heat generated by the stator winding 400 during operation while flowing through the stator winding 400, thereby achieving heat dissipation of the stator winding 400. After absorbing heat, the cooling medium then enters the medium output cavity 310 through the output hole 312 and collects along its internal output channel 3101, finally being discharged from the medium outlet pipe 320. The entire process revolves around the directional flow of the cooling medium. Through a complete cycle of "introduction-flow-heat absorption-exhaust," it continuously removes heat from the stator winding 400, thereby achieving efficient heat dissipation for the stator winding 400 and ensuring the stable operation of the 1000-speed motor.

[0155] Please refer to the previous document. Figure 1This application provides an aircraft 2000, which includes a fuselage 2200, wings 2300 connected to both sides of the fuselage 2200, a tail fin 2400 connected to the tail of the fuselage 2200, and electric propulsion systems 2100 installed on the wings 2300 and the tail fin 2400. Multiple electric propulsion systems 2100 are configured to provide power for the entire aircraft 2000 to realize the take-off, landing and flight of the aircraft 2000.

[0156] Please refer to it again. Figure 1 The aircraft 2000 of this application includes four electric propulsion systems 2100 with tilt rotors 2120b and four electric propulsion systems 2100 with fixed rotors 2120a. The four electric propulsion systems 2100 with fixed rotors 2120a are mounted on two opposite sides of the wing 2300. Furthermore, the four electric propulsion systems 2100 with tilt rotors 2120b are located inside the four electric propulsion systems 2100 with fixed rotors 2120a. Two of them are mounted on the tail fin 2400, and the remaining two are mounted on the wing 2300, so that the aircraft 2000 can achieve vertical take-off and landing and horizontal flight by utilizing the tilt rotors 2120b when it is in operation.

[0157] Specifically, the tiltrotor 2120b mounted on the wing 2300 is a semi-tilt rotor, while the tiltrotor 2120b mounted on the tail fin 2400 is a full-tilt rotor (i.e., tilting synchronously with the pod); and the tilt angle of the aforementioned semi-tilt rotor and full-tilt rotor during operation can be controlled by the tilt mechanism and driven by the electric motor 2110 to meet the usage requirements of the aircraft 2000 for vertical take-off and landing and horizontal flight.

[0158] Please see Figure 21 In one embodiment, this application also provides an electric propulsion system 2100, which includes the power motor 1000 described in any of the above embodiments; or the electric propulsion system 2100 includes an electric motor 2110 and a propeller 2120, wherein the electric motor 2110 is connected to the propeller 2120 for providing power to the propeller 2120.

[0159] Here, the electric motor 2110 is mounted on the wing 2300 or the tail fin 2400, and the propeller 2120 can rotate under the drive of the electric motor 2110 to convert the electrical energy of the electric motor 2110 into mechanical energy and provide power to the aircraft 2000.

[0160] Please see Figure 22In one embodiment, this application also provides an electric motor 2110, which includes a radiator 2111, a cooling fan 2112, and a power motor 1000 in any of the above embodiments; the cooling fan 2112 is simultaneously connected to the medium inlet 111 and the medium outlet 311; the cooling fan 2112 is used to provide air cooling for the radiator 2111.

[0161] Here, the cooling fan 2112 provides air cooling for the radiator 2111, while the radiator 2111, through its internally circulating cooling medium, forms a liquid-cooled circulation loop with the motor 1000. This liquid-cooled circulation loop continuously carries away the heat generated by the motor 1000 during operation, which is then dissipated into the air via the radiator 2111, thereby achieving efficient liquid cooling of the motor 1000. The structure of the motor 1000 can be found in the previously described section.

[0162] The power motor 1000, serving as the core of the electric motor 2110's power output, primarily consists of a stator and a rotor. The stator includes a stator support, a stator core, and stator windings. The stator windings 400 are mounted on the stator core, generating a magnetic field when energized to drive the rotor. The rotor then drives the propeller 2120 to provide power to the aircraft. In other words, the power output function of the electric motor 2110 relies on its integrated power motor 1000. The electric motor 2110 in the aircraft 2000 uses the power motor 1000 as its core power source to convert electrical energy into mechanical energy, which is then ultimately converted into the power required for the aircraft 2000's flight via the propeller 2120.

[0163] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0164] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any appropriate changes and variations made to the above embodiments within the essential spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A power motor, characterized in that, The power motor (1000) includes: A dielectric cavity (200) is provided on the dielectric cavity (200), and the dielectric cavity (210) is used to install the stator winding (400). A medium input unit (100) is provided with two independent medium inlets (111), which are respectively connected to the medium cavity (210) for introducing cooling medium into the medium cavity (210); A medium output unit (300) is provided with two independent medium outlets (311), and the two medium outlets (311) are respectively connected to the medium cavity (210) for discharging the cooling medium passing through the medium cavity (210); In this configuration, the medium inlet (111) and the medium outlet (311) are alternately arranged along the circumference of the preset circle; and the first center connection line of the two medium inlets (111) is set as L1, and the second center connection line of the two medium outlets (311) is set as L2; ​​wherein the included angle between the first center connection line L1 and the second center connection line L2 is 90°; or, the minimum included angle between the first center connection line L1 and the second center connection line L2 is less than 45°. Each of the media inlets (111) is connected to the media cavity (210) through a plurality of input holes (112), and the plurality of input holes (112) are spaced apart along the circumferential direction; along the circumferential direction, the apertures of the plurality of input holes (112) connected to each of the media inlets (111) are distributed differently. Each of the media inlets (111) and its corresponding plurality of input holes (112) are connected through a media input cavity (110); and the media input unit (100) is provided with a positioning part (113) at the position of each media input cavity (110), the positioning part (113) is integrated into the cavity where the media input cavity (110) is located, and is used to position the stator winding (400). Furthermore, along the circumferential direction, the medium input cavity (110) is configured with at least three sequentially arranged regions, namely region A, region B, and region C. The medium inlet (111) is located in region A, and the positioning part (113) is located in region B. The aperture of the input hole (112) in region A is configured as D1, and the aperture of the input hole (112) in region C is configured as D3, and D1 and D3 satisfy D1 < D3. In this configuration, the number of input holes (112) in region B is at least two, and in region B, the diameter of the input hole (112) closest to region A is set to D. 21 The aperture of the input hole (112) near region C is set to D. 22 And D 21 and D 22 Satisfy D 21 <D 22 .

2. The power motor according to claim 1, characterized in that, The two media inlets (111) are arranged in a centrally symmetrical manner with the center of the preset circle as the center of symmetry; the two media outlets (311) are arranged in a centrally symmetrical manner with the center of the preset circle as the center of symmetry.

3. The power motor according to claim 1, characterized in that, The variance of the cooling medium flow rate from the medium input unit (100) to the medium cavity (210) through the input port (112) is configured as V1, and 0 < V1 < 1.54 × 10⁻⁶. -6 .

4. The power motor according to claim 3, characterized in that, Each of the media inlets (111) is connected to its corresponding plurality of input holes (112) through a media input cavity (110); The medium input cavity (110) includes a plurality of medium channels (1101), which are arranged along the circumferential direction, and a throttling channel (114) is provided between two adjacent medium channels (1101).

5. The power motor according to claim 1, characterized in that, At least a portion of the input holes (112) in region A are configured with a diameter of D. 12 And D 12 With D 21 Satisfy D 12 =D 21 ; And / or, at least a portion of the input holes (112) in region C are configured with an aperture of D. 32 And D 32 With D 22 Satisfy D 32 =D 22 .

6. The power motor according to claim 1, characterized in that, Along the circumferential direction, region A includes at least region A1 and region A2, with region A1 located further away from region B than region A2. The medium inlet (111) is located in region A2. The aperture of the inlet hole (112) in region A1 is configured as D. 11 The aperture of the input hole (112) in region A2 is configured as D. 12 And D 11 and D 12 Satisfy D 11 >D 12 .

7. The power motor according to claim 1 or 6, characterized in that, Along the circumferential direction, region C includes at least region C1 and region C2, with region C2 located further away from region B than region C1; the aperture of the input hole (112) in region C1 is configured as D. 31 The aperture of the input hole (112) in region C2 is configured as D. 32 And D 32 and D 31 Satisfy D 32 >D 31 .

8. The power motor according to claim 1, characterized in that, Each of the media outlets (311) is connected to the media cavity (210) through a plurality of output holes (312), and the plurality of output holes (312) are arranged at intervals along the circumferential direction and are connected to the corresponding media outlets (311) through the media output cavity (310); All output holes (312) connected to each of the media outlets (311) are assigned to at least two independent output hole groups (3120); and in the circumferential direction, the media outlet (311) is located at the end of the media output cavity (310), and the media outlet (311) is connected to at least two of the output hole groups (3120) respectively.

9. The power motor according to claim 8, characterized in that, The medium output cavity (310) includes at least two output channels (3101), and the at least two output channels (3101) are respectively arranged in correspondence with at least two output hole groups (3120), and each output hole group (3120) is connected to the corresponding output channel (3101); The medium outlet (311) is simultaneously connected to all of the output channels (3101).

10. The power motor according to claim 9, characterized in that, At least two of the output channels (3101) are located on different circumferences.

11. An electric motor (2110), characterized in that, The electric motor (2110) includes a radiator (2111), a cooling fan (2112), and a power motor (1000) according to any one of claims 1 to 10. The radiator (2111) is connected to both the medium inlet (111) and the medium outlet (311); the cooling fan (2112) is used to provide air cooling for the radiator (2111).

12. An electric propulsion system (2100), characterized in that, The electric propulsion system (2100) includes the power motor (1000) as described in any one of claims 1 to 10. Alternatively, it may include a propeller (2120) and an electric motor (2110) as described in claim 11, the electric motor (2110) being drive-connected to the propeller (2120) for providing power to the propeller (2120).

13. An aircraft (2000), characterized in that, The aircraft (2000) includes the power motor (1000) as described in any one of claims 1 to 10. Alternatively, it may include the electric motor (2110) as described in claim 11. Alternatively, it may include the electric propulsion system (2100) as described in claim 12.

14. The aircraft (2000) according to claim 13, characterized in that, The aircraft (2000) is configured as an electric vertical takeoff and landing aircraft.

15. The aircraft (2000) according to claim 13, characterized in that, The aircraft (2000) further includes a fixed rotor (2120a) and / or a tilt rotor (2120b), and the electric motor (2110) is connected to the fixed rotor (2120a) and / or the tilt rotor (2120b) for providing power to the corresponding fixed rotor (2120a) or tilt rotor (2120b).

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