Electric propulsion system and aircraft

Abstract

The application discloses an electric propulsion system and an aircraft, wherein the electric propulsion system comprises a propeller mechanism, an electric motor, a controller, a storage device, a nozzle and a valve body. The electric motor is in driving connection with the propeller mechanism, the controller is in electrical connection with the electric motor, the storage device comprises a storage container for storing a cooling medium, the nozzle is in communication with the storage container, and the nozzle is used for spraying the cooling medium flowing through the electric motor and the controller. The valve body is used for adjusting the flow of the cooling medium delivered from the storage container to the nozzle. The technical scheme of the application aims to make the temperature of the electric motor and the controller lower during operation, so that the power density of the electric propulsion system is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft, and in particular to an electric propulsion system and an aircraft. Background Art

[0002] In the prior art, an aircraft includes an aircraft body and an electric propulsion system provided on the aircraft body. The electric propulsion system includes a propeller mechanism, a motor connected to the propeller mechanism, and a controller electrically connected to the motor. The controller controls the motor so that the motor drives the propeller mechanism to rotate, thereby providing power for the aircraft to fly. However, the motor and the controller have high temperatures during operation, resulting in a low power density of the electric propulsion system. Summary of the Invention

[0003] The main purpose of the present invention is to provide an electric propulsion system, which aims to keep the motor and controller at a lower temperature during operation, thereby making the power density of the electric propulsion system higher.

[0004] To achieve the above objectives, the electric propulsion system proposed in the present invention includes:

[0005] Propeller mechanism;

[0006] a motor, drivingly connected to the propeller mechanism;

[0007] a controller electrically connected to the motor;

[0008] A storage element, comprising a storage container for storing a cooling medium;

[0009] a nozzle, connected to the storage container, for spraying the cooling medium flowing through the motor and the controller; and

[0010] The valve body is used to adjust the flow rate of the cooling medium delivered from the storage container to the nozzle.

[0011] Optionally, the motor is provided with a first cooling channel connecting the nozzle and the storage container.

[0012] Optionally, the motor includes a rotor drivingly connected to the propeller mechanism, and a stator cooperating with the rotor, the stator is provided with the first cooling channel, and the stator is electrically connected to the controller.

[0013] Optionally, the stator includes a stator bracket, a stator core for the stator bracket to pass through, and a stator winding provided on the stator core, the stator bracket is provided with the first cooling channel, the stator winding is electrically connected to the controller, the rotor includes a rotating shaft passing through the stator bracket, a rotor shell connected to the rotating shaft, and a magnet provided on the inner circumference of the rotor shell, the rotating shaft is rotatably connected to the stator bracket, the inner circumference of the rotor shell is arranged opposite to the outer circumference of the stator core, and the rotating shaft is drivingly connected to the propeller mechanism.

[0014] Optionally, the stator core includes a stator yoke for the stator bracket to pass through, and a stator tooth portion provided on the outer peripheral surface of the stator yoke portion. There are multiple stator tooth portions, and the multiple stator tooth portions are arranged along the circumferential direction of the stator yoke portion. The stator winding includes multiple coils, and one coil is correspondingly wound around one stator tooth portion. The coil has a first end portion, and at least the first end portion and the corresponding stator tooth portion limit a first flow channel. The first flow channel is used for the cooling medium to pass through. One nozzle is correspondingly provided for the first flow channel, and the nozzle is set toward the corresponding first flow channel.

[0015] Optionally, the stator further includes a flow guide, which includes a first flow guide portion arranged around the stator winding, a channel opening of the first flow channel is opposite to the first flow guide portion, and another channel opening of the first flow channel is opposite to the nozzle, and the first flow guide portion is spaced apart from the stator winding to separate a second flow channel connected to the first flow channel, and the second flow channel is used for the cooling medium to pass through.

[0016] Optionally, a third flow channel connected to the second flow channel is provided between two adjacent coils, the first end is the end of the coil close to the propeller mechanism, and the third flow channel extends along the length direction of the coil. The third flow channel is used for the cooling medium to flow through, and the third flow channel is also used for the wind driven by the propeller mechanism to pass through.

[0017] Optionally, two adjacent stator teeth limit a line-passing gap extending along the extension direction of the third flow channel, and the line-passing gap is connected to the third flow channel. The guide member also includes a plurality of second guide portions connected to the first guide portion, and one of the second guide portions is correspondingly arranged in one of the line-passing gaps.

[0018] Optionally, the stator bracket includes a bracket body and a positioning ring protrusion arranged on the outer peripheral surface of the bracket body, the first cooling channel is penetrated by the bracket body and the positioning ring protrusion, the nozzle is arranged on the positioning ring protrusion, and when the stator yoke abuts against the positioning ring protrusion, the nozzle is set toward the corresponding first flow channel.

[0019] Optionally, the first cooling channel includes a first flow channel spirally surrounding the axis of the stator core.

[0020] Optionally, the stator bracket is provided with a first heat dissipation channel.

[0021] Optionally, the rotor housing includes a rotor shell body, a first fan connecting the rotor shell body and the rotating shaft, the rotating shaft has a rotation axis of the first fan, the inner circumferential surface of the rotor shell body is arranged opposite to the outer circumferential surface of the stator iron core, and the inner circumferential surface of the rotor shell body is provided with the magnetic steel.

[0022] Optionally, the stator winding is connected to the controller.

[0023] Optionally, the controller includes a controller housing having a receiving cavity, and a controller body disposed in the receiving cavity, the controller body is electrically connected to the motor, and the controller housing is provided with a second cooling channel.

[0024] Optionally, the second cooling channel includes a second flow channel spirally surrounding the receiving cavity;

[0025] Optionally, the controller further includes heat dissipation ribs provided on the outer surface of the controller housing.

[0026] Optionally, the propeller mechanism, the motor, and the controller are arranged in sequence in the extension direction of the rotation axis of the propeller mechanism, and the propeller mechanism can drive wind to drive the cooling medium sprayed from the nozzle to pass through the motor and the controller.

[0027] Optionally, the electric propulsion system also includes a fairing, which has a connecting port and an air inlet arranged relatively to each other, and the propeller mechanism includes a hub passing through the air inlet, and blades connected to the hub, the hub is drive-connected to the motor, an air inlet gap is provided between the hub and the air inlet, and the periphery of the connecting port is connected to the outer periphery of the motor close to the hub.

[0028] The present invention also provides an aircraft, comprising:

[0029] the main body of the aircraft; and

[0030] The aforementioned electric propulsion system is provided on the aircraft body.

[0031] In the technical solution of the present invention, the electric propulsion system includes a propeller mechanism, a motor, a controller, a storage element, a nozzle, and a valve body. The motor is drive-connected to the propeller mechanism. The controller is electrically connected to the motor. In this way, the controller can control the motor so that the motor drives the propeller mechanism to rotate, thereby providing flight power for the aircraft equipped with the electric propulsion system. The storage element includes a storage container for storing a cooling medium. The nozzle is connected to the storage container so that the cooling medium in the storage container can flow to the nozzle. The nozzle is used to spray the cooling medium that flows through the motor and the controller. In this way, the cooling medium exchanges heat with the motor and the controller, so that the temperature of the motor and the controller decreases, thereby improving the power density of the electric propulsion system. In addition, the valve body is used to adjust the flow rate of the cooling medium delivered from the storage container to the nozzle. In this way, the valve body can adjust the amount of cooling medium sprayed by the nozzle according to actual needs, such as the operating conditions of the electric propulsion system, so that the cooling medium is more fully utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0033] Figure 1 Schematic diagram of the structure of an electric propulsion system according to an embodiment of the present invention;

[0034] Figure 2 for Figure 1 A cross-sectional view of the CLP propulsion system;

[0035] Figure 3 for Figure 1 Exploded view of the CLP propulsion system;

[0036] Figure 4 for Figure 3 Exploded view of the middle rotor;

[0037] Figure 5 for Figure 3 Exploded view of the stator;

[0038] Figure 6 for Figure 3 Assembly drawing of the central nozzle, stator bracket, stator core and stator winding;

[0039] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0040] Figure 8 for Figure 3Side view of the assembled stator and spray nozzle;

[0041] Figure 9 for Figure 8 Middle BB cross-section;

[0042] Figure 10 for Figure 9 Enlarged view of point C in the middle;

[0043] Figure 11 for Figure 3 Schematic diagram of the structure of the controller;

[0044] Figure 12 for Figure 11 A cross-sectional view of the controller;

[0045] Figure 13 for Figure 3 Schematic diagram of the storage structure.

[0046] Description of Figure Numbers:

[0047]

[0048]

[0049] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0051] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0052] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection, indirect connection through an intermediate medium, or abutment; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0054] In the prior art, an aircraft includes an aircraft body and an electric propulsion system mounted thereon. The electric propulsion system includes a propeller mechanism, a motor drivingly connected to the propeller mechanism, and a controller electrically connected to the motor. The controller controls the motor, causing the motor to drive the propeller mechanism to rotate, thereby providing power for the aircraft to fly. However, the motor and controller have high operating temperatures, resulting in a low power density of the electric propulsion system. Therefore, the present invention proposes an electric propulsion system designed to lower the operating temperatures of the motor and controller, thereby increasing the power density of the electric propulsion system.

[0055] Reference Figures 1 to 3 ,as well as Figure 13In one embodiment of the present invention, the electric propulsion system 100 includes a propeller mechanism 200, a motor 300, a controller 400, a storage unit 500, a nozzle 600, and a valve body. The motor 300 is drivingly connected to the propeller mechanism 200. The controller 400 is electrically connected to the motor 300. Thus, the controller 400 can control the motor 300, causing the motor 300 to drive the propeller mechanism 200, thereby providing flight power for the aircraft equipped with the electric propulsion system 100. The storage unit 500 includes a storage container 510 for storing a cooling medium. The nozzle 600 is connected to the storage container 510, allowing the cooling medium in the storage container 510 to flow to the nozzle 600. The nozzle 600 is configured to discharge the cooling medium flowing through the motor 300 and controller 400. This allows the cooling medium to exchange heat with the motor 300 and controller 400, reducing the temperature of the motor 300 and controller 400, thereby increasing the power density of the electric propulsion system 100. In addition, the valve body is used to adjust the flow rate of the cooling medium delivered from the storage container 510 to the nozzle 600. In this way, the valve body can adjust the amount of cooling medium sprayed out by the nozzle 600 according to actual needs, such as the working conditions of the electric propulsion system 100, so that the cooling medium can be more fully utilized.

[0056] Refer to Figure 5 ,and Figures 8 to 10 Optionally, in one embodiment, the motor 300 is provided with a first cooling channel 340 connecting the nozzle 600 and the storage container 510. In this manner, the cooling medium in the storage container 510 also flows into the first cooling channel 340. The cooling medium in the first cooling channel 340 exchanges heat with the motor 300, thereby reducing the temperature of the motor 300 and improving the power density of the electric propulsion system 100. Of course, in other embodiments, the electric propulsion system 100 includes a first cooling pipe passing through the motor 300, connecting the nozzle 600 and the storage container 510.

[0057] Optionally, in one embodiment, the motor 300 includes a rotor 310 drivingly connected to the propeller mechanism 200, and a stator 330 cooperating with the rotor 310. The stator 330 is provided with a first cooling channel 340, and the stator 330 is electrically connected to the controller 400. It will be appreciated that the stator 330 includes a stator winding 337, which generates a relatively large amount of heat. Therefore, providing the first cooling channel 340 in the stator 330 is beneficial for improving the heat dissipation of the motor 300. Of course, in other embodiments, the rotor 310 is provided with the first cooling channel 340.

[0058] Refer to Figure 4The first cooling channel 340 is positioned differently for different types of motors 300. Optionally, in one embodiment, the stator 330 includes a stator bracket 331, a stator core 334 through which the stator bracket 331 passes, and a stator winding 337 disposed on the stator core 334. The stator bracket 331 is provided with the first cooling channel 340, and the stator winding 337 is electrically connected to the controller 400. The rotor 310 includes a rotating shaft 311 through which the stator bracket 331 passes, a rotor housing 312 connected to the rotating shaft 311, and a magnet 321 disposed on the inner circumference of the rotor housing 312. The rotating shaft 311 is rotatably connected to the stator bracket 331, the inner circumference of the rotor housing 312 is disposed opposite the outer circumference of the stator core 334, and the rotating shaft 311 is drivingly connected to the propeller mechanism 200. It can be understood that the motor 300 is an outer rotor 310 motor 300, and the first cooling channel 340 is disposed on the stator bracket 331. Of course, in other embodiments, the motor 300 may also be an inner rotor 310 motor 300 or a dual rotor 310 motor 300. Corresponding to different types of motors 300, the first cooling channel 340 may be set according to actual needs.

[0059] Optionally, in one embodiment, the rotating shaft 311 and the stator bracket 331 are rotatably connected via a first bearing.

[0060] Optionally, in one embodiment, the nozzle 600 is positioned toward the stator winding 337. Since the stator winding 337 generates a large amount of heat, the nozzle 600 sprays directly toward the stator winding 337, thereby helping to reduce the temperature of the stator winding 337 and thereby improving the heat dissipation effect on the motor 300. Of course, in other embodiments, the nozzle 600 is positioned toward the stator core 334. In this case, since the stator winding 337 is disposed on the stator core 334, the temperature of the stator winding 337 can be indirectly reduced by cooling the stator core 334, thereby improving the heat dissipation effect on the motor 300.

[0061] Refer to Figure 6 and Figure 7Optionally, in one embodiment, the stator core 334 includes a stator yoke 335 for the stator bracket 331 to pass through, and a stator tooth 336 provided on the outer peripheral surface of the stator yoke 335. A plurality of stator teeth 336 are provided, and the plurality of stator teeth 336 are arranged along the circumferential direction of the stator yoke 335. The stator winding 337 includes a plurality of coils 338. A coil 338 is correspondingly wound around a stator tooth 336. The coil 338 has a first end 339. At least the first end 339 and the corresponding stator tooth 336 limit a first flow channel 343. The first flow channel 343 is used for the cooling medium to pass through. A nozzle 600 is correspondingly provided for a first flow channel 343, and the nozzle 600 is set toward the corresponding first flow channel 343. In this way, the cooling medium sprayed from the nozzle 600 can pass through the first flow channel 343. Since the first flow channel 343 is bounded by the end of the coil 338 and the stator tooth 336, the cooling medium can more fully contact the end of the coil 338 and the stator tooth 336 within the first flow channel 343, thereby cooling the end of the coil 338 and the stator tooth 336 and improving the heat dissipation effect on the end of the coil 338 and the stator tooth 336. Of course, in other embodiments, the nozzle 600 is positioned toward the end of the coil 338, and the spray direction of the nozzle 600 is along the length of the coil 338.

[0062] It is worth mentioning that, in one embodiment, the nozzle 600 is used to eject a gaseous cooling medium, which helps improve the heat dissipation effect of the motor 300 and the controller 400. The cooling medium may be, but is not limited to, a refrigerant. The storage container 510 can be configured as a storage container or a gas storage container. Taking the storage container 510 as an example, the cooling medium is in a liquid state within the storage container 510 and gradually transforms into a gaseous state as it flows to the nozzle 600, and is finally ejected from the nozzle 600. It is understood that the storage container 510 is under high pressure, and the cooling medium in the storage container 510 can rely on the high pressure within the storage container 510 to flow to the nozzle 600. In this way, a pump body for driving the flow of the cooling medium can be eliminated. Furthermore, the electric propulsion system 100 also includes a valve body for controlling the flow rate of the cooling medium delivered from the storage container 510 to the nozzle 600. However, the present design is not limited to this. In other embodiments, the nozzle 600 is used to eject a liquid cooling medium.

[0063] Optionally, in one embodiment, a nozzle 600 extends into the first flow channel 343. In this way, the amount of cooling medium entering the first flow channel 343 can be greatly increased, and the occurrence of part of the cooling medium not passing through the first flow channel 343 can be reduced, thereby improving the cooling effect on the end of the coil 338 and the stator bracket 331.

[0064] Optionally, in one embodiment, the stator 330 further includes a flow guide 350. The flow guide 350 includes a first flow guide portion 351 disposed around the stator winding 337. One opening of the first flow channel 343 opposes the first flow guide portion 351, and another opening of the first flow channel 343 opposes the nozzle 600. The first flow guide portion 351 is spaced apart from the stator winding 337 to define a second flow channel 344 that communicates with the first flow channel 343. In this manner, after passing through the first channel, the cooling medium impacts the first flow guide portion 351 and flows circumferentially along the flow guide portion, i.e., along the second flow channel 344. The cooling medium then passes through the multiple coils 338 of the stator winding 337, dissipating heat from the ends of the multiple coils 338. This effectively utilizes the cooling medium and improves the heat dissipation effect of the motor 300.

[0065] Optionally, in one embodiment, a third flow channel 345 is provided between two adjacent coils 338, communicating with the second flow channel 344. The first end 339 is the end of the coil 338 closest to the propeller mechanism 200. The third flow channel 345 extends along the length of the coil 338. This third flow channel 345 is used to allow the flow of cooling medium and also allows the flow of wind driven by the propeller mechanism 200. In this way, after the cooling medium flows from the second channel to the third channel, driven by the wind driven by the propeller, the cooling medium can flow more quickly through the third channel, allowing the coils 338 to come into contact with the new, cooler cooling medium, accelerating heat exchange with the coils 338. Furthermore, the third channel extends along the length of the coil 338, allowing the cooling medium to dissipate heat over a larger area of ​​the coil 338 after passing through the third channel, thereby improving the cooling effect of the cooling medium on the coil 338.

[0066] Optionally, in one embodiment, two adjacent stator teeth 336 define a wire-passing notch 342 extending along the extension direction of the third flow channel 345. The wire-passing notch 342 communicates with the third flow channel 345. The flow guide 350 further includes a plurality of second flow guide portions 352 connected to the first flow guide portions 351, with each second flow guide portion 352 corresponding to a wire-passing notch 342. In this manner, the second flow guide portions 352 can reduce the amount of coolant flowing through the third flow channel 345 that escapes through the wire-passing notch 342, thereby allowing more coolant to flow through the third flow channel 345. This allows for sufficient heat exchange between the coolant and the coil 338, thereby reducing the temperature of the coil 338. It is worth noting that the second flow guide portions 352 also help prevent the coil 338 from escaping from the stator tooth 336 through the wire-passing notch 342.

[0067] Optionally, in one embodiment, the flow guide 350 further includes a connecting portion 353 surrounding the stator 330, one end of the second flow guide portion 352 is connected to the first flow guide portion 351, and the other end of the second flow guide portion 352 is connected to the second flow guide portion 352. In this way, the structure of the flow guide 350 is relatively stable.

[0068] Optionally, in one embodiment, the first cooling channel 340 includes a first flow channel 343 that spirals around the axis of the stator core 334. This allows for a longer first flow channel 343, facilitating more efficient heat exchange between the cooling medium within the first flow channel 343 and the stator support 331, thereby cooling the stator core 334 and, in turn, the stator windings 337, improving the heat dissipation of the motor 300. This also facilitates uniform heat dissipation from the stator support 331, maintaining a lower overall temperature of the stator 330. Optionally, in one embodiment, the first cooling channel 340 may further include other flow channels communicating with the first flow channel 343.

[0069] Optionally, in one embodiment, the stator support 331 includes a support body 332 and a positioning protrusion 333 disposed on the outer circumference of the support body 332. The first cooling channel 340 extends through the support body 332 and the positioning protrusion 333. The nozzle 600 is disposed on the positioning protrusion 333. When the stator yoke 335 abuts the positioning protrusion 333, the nozzle 600 is disposed toward the corresponding first flow channel 343. This configuration not only saves piping connecting the first channel and the nozzle 600, facilitating miniaturization of the motor 300, but also improves the assembly efficiency of the motor 300 through the coordination between the stator yoke 335 and the positioning protrusion 333.

[0070] It should be pointed out that the nozzle 600 mentioned in this application refers to a structure with a spraying function. For example, the stator bracket 331 is provided with a spray hole structure for spraying out the cooling medium flowing through the motor 300 and the controller 400. The spray hole structure should also be regarded as the nozzle 600.

[0071] Optionally, in one embodiment, the stator bracket 331 is provided with a first heat dissipation channel 341 , so that the temperature of the stator bracket 331 is further reduced through the first heat dissipation channel 341 .

[0072] Optionally, in one embodiment, a plurality of first heat dissipation channels 341 are provided, and a greater number of first heat dissipation channels 341 is more conducive to heat dissipation of the support ring.

[0073] Optionally, in one embodiment, a plurality of first heat dissipation channels 341 are spaced apart along the circumferential direction of the stator bracket 331 . This is beneficial for uniform heat dissipation of the stator bracket 331 , thereby facilitating uniform heat dissipation of the stator core 334 , and further facilitating uniform heat dissipation of the stator winding 337 , thereby lowering the overall temperature of the motor 300 .

[0074] Optionally, in one embodiment, a channel opening of the first heat dissipation channel 341 is opposite to the propeller mechanism 200, and the propeller mechanism 200 is used to drive air through the first heat dissipation channel 341. In this way, the air flow in the first heat dissipation channel 341 is accelerated, and the heat dissipation effect on the stator bracket 331 is improved.

[0075] Optionally, in one embodiment, the rotor housing 312 includes a rotor housing body 313, a first fan 314 connecting the rotor housing body 313 and the rotating shaft 311, the rotating shaft 311 defining a rotation axis for the first fan 314, and an inner circumferential surface of the rotor housing body 313 opposing the outer circumferential surface of the stator core 334. A magnet 321 is disposed on the inner circumferential surface of the rotor housing body 313. Thus, when the rotating shaft 311 rotates, the first fan 314 also rotates, driving airflow through the motor 300, thereby cooling the motor 300. Furthermore, in one embodiment, the cooling medium ejected from the nozzle 600 can be blown toward the motor 300 by the wind driven by the first fan 314, thereby accelerating the flow rate of the cooling medium, allowing the motor 300 to come into contact with fresh, cooler cooling medium, thereby improving the heat dissipation effect of the motor 300. Specifically, in one embodiment, the first fan 314 includes a first annular support 315 connected to the rotor housing body 313 , and a plurality of first blades 316 connecting the annular support and the rotating shaft 311 . The plurality of first blades 316 are arranged at intervals around the rotating shaft 311 .

[0076] Optionally, in one embodiment, the rotor housing 312 further includes a second fan 317 connected to the rotor housing body 313, and the rotating shaft 311 has a rotation axis of the second fan 317. In this way, when the rotating shaft 311 rotates, the second fan 317 will also rotate, and the second fan 317 will drive the air flow through the motor 300, so that the motor 300 can come into contact with a new cooling medium with a lower temperature, thereby cooling the motor 300. Furthermore, in one embodiment, the wind driven by the second fan 317 can drive the cooling medium ejected by the nozzle 600 to flow through the motor 300, thereby improving the heat dissipation effect of the motor 300. Specifically, in one embodiment, the second fan 317 includes a second annular bracket 318 connected to the rotor housing body 313, a third annular bracket 319 provided in the second annular bracket, and a plurality of second blades 320 connected to the annular bracket and the rotating shaft 311. The plurality of second blades 320 are arranged at intervals around the third annular bracket 319, and the third annular bracket 319 is connected to the stator bracket 331 via a second bearing.

[0077] Optionally, in one embodiment, the stator winding 337 is connected to the controller 400. This eliminates the need for cables connecting the stator winding 337 and the controller 400, preventing electromagnetic interference from the cables on the electric propulsion system 100. This results in a higher level of integration and a lighter weight for the electric propulsion system 100. Of course, in other embodiments, the controller 400 and the stator winding 337 are connected via cables.

[0078] Optionally, in one embodiment, the inner circumference of the rotor housing 312 and the outer circumference of the stator core 334 define an air passage for the propeller-driven wind to pass through, and the magnet 321 is disposed in the air passage. In this way, when the propeller rotates, the propeller-driven wind can also dissipate heat from the magnet 321 and the stator 330.

[0079] Refer to Figure 11 and 12 Optionally, in one embodiment, the controller 400 includes a controller housing 410 having a receiving cavity, and a controller body 411 disposed in the receiving cavity. The controller body 411 is electrically connected to the motor 300, and the controller housing 410 is provided with a second cooling channel 415. In this way, the cooling medium in the storage container 510 will also flow to the second cooling channel 415, and the cooling medium in the second cooling channel 415 will exchange heat with the controller housing 410, so that the temperature of the controller housing 410 drops, thereby dropping the temperature in the receiving cavity, and further dropping the temperature of the controller body 411, thereby improving the power density of the electric propulsion system 100. The controller body 411 may include, but is not limited to, a control module, a drive module, and a power module. Of course, in other embodiments, the electric propulsion system 100 also includes a second cooling pipe passing through the controller 400, and the second cooling pipe connects the nozzle 600 and the storage container 510.

[0080] Optionally, in one embodiment, the second cooling channel 415 includes a second flow channel 344 that spirally surrounds the receiving cavity. Thus, the spirally arranged second flow channel 344 is longer, which facilitates sufficient heat exchange between the cooling medium in the second flow channel 344 and the controller housing 410, thereby improving the heat dissipation effect on the controller body 411. Optionally, in one embodiment, the second cooling channel 415 may further include other flow channels that communicate with the second flow channel 344.

[0081] Optionally, in one embodiment, the controller body 411 is disposed on the cavity wall of the receiving cavity, so that the heat dissipation effect of the cooling medium on the controller body 411 can be improved.

[0082] Optionally, in one embodiment, the controller 400 further includes heat dissipation ribs 412 provided on the outer surface of the controller housing 410. The heat dissipation ribs 412 increase the area of ​​the controller housing 410 in contact with air, thereby helping to reduce the temperature of the controller housing 410 and indirectly reducing the temperature of the controller body.

[0083] Optionally, in one embodiment, the controller 400 further includes a first outer shell 413, the inner circumference of which opposes the outer circumference of the controller housing 410. Heat dissipation ribs 412 connect the inner circumference of the first outer shell 413 and the outer surface of the controller housing 410. Multiple heat dissipation ribs 412 are provided, spaced apart along the circumference of the first outer shell 413. Adjacent heat dissipation ribs 412 define a second heat dissipation channel 414, which is configured to allow the flow of cooling medium and also to allow the flow of wind driven by the propeller mechanism 200. In this manner, the cooling medium flowing through the second heat dissipation channel 414 can more effectively exchange heat with the controller housing 410. Furthermore, the wind driven by the propeller structure can more quickly move the cooling medium through the second heat dissipation channel 414, allowing the controller housing 410 to come into contact with fresh, lower-temperature cooling medium, thereby improving the heat dissipation effect on the controller housing 410.

[0084] Alternatively, in one embodiment, the propeller mechanism 200, the motor 300, and the controller 400 are sequentially arranged along the extension direction of the rotation axis of the propeller mechanism 200. The propeller mechanism 200 can drive wind to drive the cooling medium ejected from the nozzle 600 through the motor 300 and the controller 400. In this way, the propeller mechanism 200 not only provides power for the aircraft, but the wind driven by the propeller mechanism 200 can also provide air cooling for the motor 300 and the controller 400. Furthermore, the wind can also increase the flow rate of the cooling medium ejected from the nozzle 600, allowing the motor 300 and the controller 400 to come into contact with fresh cooling medium at a lower temperature, thereby improving the heat exchange efficiency between the cooling medium and the motor 300 and the controller 400, and facilitating cooling of the motor 300 and the controller 400. However, the present design is not limited to this. In other embodiments, the motor 300 and the controller 400 are arranged side by side on one side of the propeller mechanism 200.

[0085] It should be noted that Figure 2 The dotted line with an arrow in the middle represents the wind driven by the propeller mechanism 200 .

[0086] Optionally, in one embodiment, the electric propulsion system 100 further includes a shroud 700 having a connection port and an air inlet positioned opposite each other. The propeller mechanism 200 includes a hub 210 extending through the air inlet and blades 220 connected to the hub 210. The hub 210 is drivingly connected to the motor 300, with an air inlet gap defined between the hub 210 and the air inlet. Driven by the motor 300, the hub 210 rotates the blades 220, and a portion of the wind driven by the blades 220 flows through the air inlet gap, allowing this portion of the wind to enter the shroud 700. The peripheral edge of the connection port is connected to the outer peripheral edge of the motor 300 on the side closest to the hub 210. This prevents this portion of wind from flowing outside the shroud 700 before reaching the motor 300, allowing more wind to flow through the motor 300 and improving heat dissipation for the motor 300. It is worth mentioning that in one embodiment, the outer peripheral surface of the air deflector 700 is tapered in the direction from the connecting port to the air inlet. In this way, the wind driven by the blades 220 encounters less resistance when passing through the outer peripheral surface of the air deflector 700, which is beneficial to reducing the wind resistance of the propulsion system.

[0087] Optionally, in one embodiment, the propeller mechanism 200 further includes a pitch-changing mechanism or a tilting mechanism, so that the propeller mechanism 200 can realize the pitch-changing or tilting function.

[0088] Optionally, in one embodiment, the storage unit 500 further includes a second housing 530 and a plurality of support ribs 520. The inner circumference of the second housing 530 is disposed opposite the outer circumference of the storage container 510. The support ribs 520 connect the inner circumference of the second housing 530 to the outer surface of the second housing 530. The plurality of support ribs 520 are spaced apart along the circumference of the second housing 530, with adjacent support ribs 520 defining an outlet duct 540. Along the axis of the propeller mechanism 200, the shroud 700, rotor housing 312, first housing 413, and second housing 530 are sequentially disposed and connected. The shroud 700, rotor housing 312, first housing 413, and second housing 530 collectively define an outlet air cavity. The propeller mechanism 200 drives air into the air cavity through the air inlet gap and then out through the outlet air duct 540. Within the air cavity, the motor 300 and controller 400 can effectively exchange heat with the air.

[0089] The present invention also proposes an aircraft, which includes an aircraft body and an electric propulsion system 100 arranged on the aircraft body. The specific structure of the electric propulsion system 100 refers to the above-mentioned embodiment. Since this aircraft adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0090] The above are only optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An electric propulsion system, characterized in that: include: Propeller mechanism; a motor, drivingly connected to the propeller mechanism; a controller electrically connected to the motor; A storage element, comprising a storage container for storing a cooling medium; a nozzle, connected to the storage container, for spraying the cooling medium flowing through the motor and the controller; as well as a valve body, for regulating the flow rate of the cooling medium delivered from the storage container to the nozzle; In the extension direction of the rotation axis of the propeller mechanism, the propeller mechanism, the motor, and the controller are arranged in sequence, and the propeller mechanism can drive wind to drive the cooling medium sprayed from the nozzle to pass through the motor and the controller.

2. The electric propulsion system according to claim 1, wherein: The motor is provided with a first cooling channel communicating with the nozzle and the storage container.

3. The electric propulsion system according to claim 2, wherein: The motor includes a rotor drivingly connected to the propeller mechanism and a stator cooperating with the rotor. The stator is provided with the first cooling channel, and the stator is electrically connected to the controller.

4. The electric propulsion system according to claim 3, wherein: The stator includes a stator bracket, a stator core for the stator bracket to pass through, and a stator winding provided on the stator core. The stator bracket is provided with the first cooling channel. The stator winding is electrically connected to the controller. The rotor includes a rotating shaft passing through the stator bracket, a rotor shell connected to the rotating shaft, and a magnet provided on the inner circumference of the rotor shell. The rotating shaft is rotatably connected to the stator bracket, the inner circumference of the rotor shell is arranged opposite to the outer circumference of the stator core, and the rotating shaft is drivingly connected to the propeller mechanism.

5. The electric propulsion system according to claim 4, wherein: The stator core includes a stator yoke for the stator bracket to pass through, and a stator tooth portion provided on the outer peripheral surface of the stator yoke portion. There are multiple stator tooth portions, and the multiple stator tooth portions are arranged along the circumferential direction of the stator yoke portion. The stator winding includes multiple coils, and one coil is correspondingly wound around one stator tooth portion. The coil has a first end portion, and at least the first end portion and the corresponding stator tooth portion limit a first flow channel. The first flow channel is used for the cooling medium to pass through. A nozzle is correspondingly provided for each first flow channel, and the nozzle is arranged toward the corresponding first flow channel.

6. The electric propulsion system according to claim 5, wherein: The stator also includes a flow guide, which includes a first flow guide portion arranged around the stator winding, a channel opening of the first flow channel is opposite to the first flow guide portion, and another channel opening of the first flow channel is opposite to the nozzle. The first flow guide portion is spaced apart from the stator winding to separate a second flow channel connected to the first flow channel, and the second flow channel is used for the cooling medium to pass through.

7. The electric propulsion system according to claim 6, wherein: A third flow channel connected to the second flow channel is provided between two adjacent coils. The first end is the end of the coil close to the propeller mechanism. The third flow channel extends along the length direction of the coil. The third flow channel is used for the cooling medium to flow through. The third flow channel is also used for the wind driven by the propeller mechanism to pass through.

8. The electric propulsion system according to claim 7, wherein: The two adjacent stator teeth limit a wire gap extending along the extension direction of the third flow channel, and the wire gap is connected to the third flow channel. The guide member also includes a plurality of second guide parts connected to the first guide part, and one of the second guide parts is correspondingly arranged at one of the wire gaps.

9. The electric propulsion system according to claim 5, wherein: The stator bracket includes a bracket body and a positioning ring protrusion provided on the outer peripheral surface of the bracket body. The first cooling channel is penetrated by the bracket body and the positioning ring protrusion. The nozzle is provided on the positioning ring protrusion. When the stator yoke abuts against the positioning ring protrusion, the nozzle is set toward the corresponding first flow channel.

10. The electric propulsion system according to claim 4, wherein: The first cooling channel includes a first flow channel spirally surrounding the axis of the stator core; And / or, the stator bracket is provided with a first heat dissipation channel; And / or, the rotor housing includes a rotor shell body, a first fan connecting the rotor shell body and the rotating shaft, the rotating shaft having a rotation axis of the first fan, an inner circumferential surface of the rotor shell body being arranged opposite to an outer circumferential surface of the stator core, and the inner circumferential surface of the rotor shell body being provided with the magnetic steel; And / or, the stator winding is connected to the controller.

11. The electric propulsion system according to claim 1, wherein: The controller includes a controller housing having a receiving cavity and a controller body arranged in the receiving cavity. The controller body is electrically connected to the motor. The controller housing is provided with a second cooling channel.

12. The electric propulsion system according to claim 11, wherein: The second cooling channel includes a second flow channel spirally surrounding the receiving cavity; And / or, the controller further includes heat dissipation ribs provided on the outer surface of the controller housing.

13. The electric propulsion system according to claim 1, wherein: The electric propulsion system also includes a fairing, which has a connecting port and an air inlet arranged relatively to each other. The propeller mechanism includes a hub passing through the air inlet and blades connected to the hub. The hub is drive-connected to the motor. An air inlet gap is provided between the hub and the air inlet. The periphery of the connecting port is connected to the outer periphery of the motor on the side close to the hub.

14. An aircraft, characterized in that: include: Aircraft body; as well as The electric propulsion system according to any one of claims 1 to 13, provided on the aircraft body.

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