A rotor motor with active heat dissipation, a rotor power system and an aircraft

Abstract

The application provides a rotor motor with active heat dissipation, a rotor power system and an aircraft, and relates to the technical field of the aircraft.The rotor motor comprises a shell, a stator, a rotor, an oil pump and a conveying pipe.A sealed cavity is arranged in the shell, a collection area is arranged at the bottom of the sealed cavity, the stator and the rotor are arranged in the sealed cavity, the stator is fixed to the shell, the rotor is rotationally connected to the shell through a rotating shaft assembly, the rotating shaft assembly is provided with a flow channel for transporting cooling medium and a backflow channel, the oil pump is used for conveying the cooling medium in the collection area to the flow channel, the conveying pipe is exposed outside the sealed cavity and is connected to the flow channel and the backflow channel, the input end of the flow channel is arranged adjacent to the collection area, and the output end is located outside the sealed cavity, the input end of the backflow channel is located outside the sealed cavity, the output end is located inside the sealed cavity, and the output end is arranged radially in the direction perpendicular to the rotating axis of the rotor.The application can improve the heat dissipation capacity of the rotor motor to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of aircraft technology, and in particular to a rotor motor with active cooling, a rotor power system, and an aircraft. Background Technology

[0002] As the core power unit of rotorcraft, the rotor motor's main function is to convert input electrical energy into mechanical energy to directly drive the rotor's rotation, thereby generating the lift and thrust required for flight. With the continuous development of UAV technology towards higher thrust-to-weight ratios and longer flight times, the industry has placed higher demands on the power density of rotor motors—that is, to achieve greater power output within an extremely compact size and strict weight constraints. However, the increase in power density inevitably leads to a surge in internal heat generation, making temperature rise control a core bottleneck restricting performance improvement.

[0003] Currently, the mainstream rotor motor cooling solution mainly relies on passive air-cooling structures. Specifically, heat dissipation fins are installed on the motor housing, and the airflow generated by the rotor rotation during flight blows over the surface of the heat dissipation fins, carrying away the heat generated inside the motor through convection heat transfer.

[0004] However, while the aforementioned passive cooling structure based on air cooling has the advantages of simple structure and no additional energy consumption, its heat dissipation capacity is gradually failing to meet the development requirements of high-power-density rotor motors. Specifically, the heat dissipation efficiency of this method is heavily dependent on flight speed and attitude. Under conditions of weak airflow, such as hovering and low-speed climb, the heat dissipation efficiency will decrease significantly, leading to localized overheating of the motor, increased risk of magnet demagnetization, and affecting the motor's lifespan and reliability. Therefore, how to break through the limits of passive cooling and effectively improve the heat dissipation capacity of rotor motors without significantly increasing or even changing the existing structural volume and weight has become a pressing technical challenge in this field. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a rotor motor with active cooling, a rotor propulsion system, and an aircraft. By incorporating an active cooling system, the rotor motor can improve its heat dissipation capacity to a certain extent.

[0006] According to an embodiment of the present invention, a rotor motor with active cooling includes a housing, a stator, a rotor, an oil pump, and a delivery pipe. The housing has a sealed cavity with a downwardly recessed collection area at its bottom. The stator is disposed within the sealed cavity and fixedly connected to the housing. The rotor is disposed within the sealed cavity and rotatably connected to the housing via a shaft assembly. The shaft assembly is arranged with a delivery channel and a return channel for transporting cooling medium. The oil pump is disposed within the collection area and is used to deliver the cooling medium from the collection area to the delivery channel. The delivery pipe is exposed outside the sealed cavity and connects the delivery channel and the return channel. The input end of the delivery channel is located adjacent to the collection area, and the output end of the delivery channel is located outside the sealed cavity. The input end of the return channel is located outside the sealed cavity, and the output end of the return channel is located inside the sealed cavity and arranged radially in a direction perpendicular to the rotor's rotation axis. The output end of the return channel is configured such that the output cooling medium can flow from top to bottom through the windings between the stator and the rotor.

[0007] The rotor motor with active cooling according to embodiments of the present invention has at least the following beneficial effects: By integrating an oil pump and a closed circulation loop consisting of a delivery channel, a conveying pipe, and a return channel, forced circulation of the cooling medium is achieved, forming an active cooling system independent of external airflow conditions. Specifically, this active cooling system designs the output end of the return channel to be arranged radially in a direction perpendicular to the rotor's rotation axis, and configures its output direction to ensure that the cooling medium can flow from top to bottom through the windings between the stator and the rotor. This achieves direct and directional flushing cooling of the core heat-generating area (windings) of the motor. This active cooling method greatly increases the effective heat exchange area, allowing the heat generated by the windings to be quickly and evenly carried away by the high-speed flowing cooling medium. The heat dissipation efficiency is far higher than that of the traditional indirect conduction cooling mode of the casing. It overcomes the inherent defect of the traditional passive air cooling, which causes a sharp drop in heat dissipation efficiency under low airflow conditions such as hovering and low-speed climbing. This ensures that the rotor motor can obtain stable and reliable heat dissipation during operation, improving the motor's working stability and environmental adaptability. Furthermore, the cooling channels (transport channels and return channels) are creatively integrated into the shaft assembly that performs the power transmission function, and the oil pump is built into the collection area at the bottom of the housing. This integrated design allows the entire active cooling system to be almost completely contained within the original structure of the motor. Without significantly increasing the external volume, weight and structural complexity of the whole machine, the heat dissipation capacity is further improved, which meets the stringent requirements of high power density motors for extreme compactness and lightweight.

[0008] According to some embodiments of the present invention, the rotating shaft assembly includes an outer shaft and an inner shaft. The outer shaft is rotatably connected to the housing via a first bushing and rotatably connected to the stator via a second bushing. The outer shaft has a first accommodating cavity inside, one end of the outer shaft has a first opening communicating with the first accommodating cavity, and the other end of the outer shaft has a reflux hole communicating with the first accommodating cavity. The reflux hole is communicating with one end of the conveying pipe. The diameter of the inner shaft is smaller than the diameter of the outer shaft. The inner shaft has a second accommodating cavity inside, one end of the inner shaft extends into the first accommodating cavity and is connected to the outer shaft, and has a flow hole communicating with the other end of the conveying pipe. The other end of the inner shaft is disposed adjacent to the collection area and has a second opening communicating with the second accommodating cavity. The second opening is connected to the output end of the oil pump. The second bushing has spray holes spaced apart along its circumference, and the spray holes are communicating with the first accommodating cavity.

[0009] According to some embodiments of the present invention, the top of the stator is provided with a gap between it and the housing, and the rotor is provided with a cover plate, which is disposed between the top of the stator and the housing, and the cover plate is connected to the second bushing.

[0010] According to some embodiments of the present invention, the cover plate is detachably connected to the second bushing.

[0011] According to some embodiments of the present invention, a flange is fitted onto the second bushing, the cover plate includes a fixed seat and a plurality of partitions, the fixed seat is connected to the flange, the nozzle penetrates the flange and the fixed seat, the winding on the rotor is connected to the fixed seat through the partitions, the plurality of partitions are arranged radially in a direction perpendicular to the rotation axis of the rotor, and the area between adjacent partitions is aligned with the position of a corresponding nozzle.

[0012] According to some embodiments of the present invention, the second bushing is rotatably connected to the stator via a bearing.

[0013] According to some embodiments of the present invention, a locking member is provided at one end of the inner shaft near the collection area, and the locking member abuts against the inner ring of the bearing.

[0014] Another aspect of the embodiments of this application provides a rotor power system, including a rotor and a rotor motor with active cooling of any of the aforementioned structures, wherein the rotor is connected to the rotor and the delivery pipe is disposed on the rotor.

[0015] According to the rotor propulsion system of the present invention, based on the aforementioned rotor motor with active heat dissipation, the rotor is used as a key component of the heat dissipation circuit (the delivery pipe is located on the rotor). When the cooling medium flows in the delivery pipe located on the rotor, it is directly subjected to the dual effects of the rotor rotation centrifugal force and the oncoming airflow. This not only promotes the flow of the cooling medium in the pipe and enhances heat exchange, but more importantly, the rotor blades are equivalent to a high-speed rotating "forced air-cooled radiator" in flight. Its huge surface area and continuous high-speed airflow make the heat dissipation efficiency exceed that of any static or miniaturized additional radiator. Moreover, compared with independent external radiators or complex external piping, it can provide excellent heat dissipation capabilities while achieving the ultimate power-to-weight ratio and compactness at the power system level, thereby providing core support for the overall weight reduction and layout optimization of the aircraft.

[0016] According to some embodiments of the present invention, a fairing is provided at the root of the rotor, and the delivery pipe is provided on the windward side of the fairing.

[0017] Another aspect of the embodiments of this application provides an aircraft that uses a rotor propulsion system with any of the aforementioned structures.

[0018] The aircraft according to embodiments of the present invention can reduce the temperature rise of the rotor motor when operating at high power, based on the high heat dissipation capacity and structural characteristics of the aforementioned rotor power system, thereby reducing the performance and efficiency degradation caused by overheating.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and some of these additional aspects and advantages will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a rotor motor according to an embodiment of the present invention;

[0021] Figure 2 This is an exploded view of a partial structure of a rotor motor according to an embodiment of the present invention;

[0022] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0023] Figure 4 This is a three-dimensional sectional view of a rotor motor according to an embodiment of the present invention;

[0024] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

[0025] Figure 6 This is a schematic diagram of the overall structure of the rotor power system in one embodiment of the present invention;

[0026] Figure 7 This is an exploded view of a partial structure of the rotor power system in one embodiment of the present invention;

[0027] Explanation of key component symbols:

[0028] 100 housing, 110 sealed cavity, 111 collection area, 120 inclined plane, 200 stator, 210 column, 220 first bearing, 230 second bearing, 310 winding, 320 cover plate, 321 fixed seat, 322 partition plate, 400 oil pump, 500 conveying pipe, 600 rotating shaft assembly, 610 outer shaft, 611 first accommodating cavity, 612 first opening, 613 return hole, 620 inner shaft, 621 second accommodating cavity, 622 conveying hole, 623 second opening, 624 stop block, 630 first bushing, 640 second bushing, 641 nozzle, 642 flange, 700 locking element, 710 locking shaft, 720 locking sleeve, 800 rotor, 900 fairing;

[0029] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0032] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0033] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0034] Reference Figures 1 to 5The rotor motor with active heat dissipation in this embodiment of the invention includes a housing 100, a stator 200, a rotor, an oil pump 400, and a delivery pipe 500.

[0035] Specifically, the housing 100 has a sealing cavity 110, and the bottom of the sealing cavity 110 has a downwardly recessed collection area 111. The stator 200 is disposed within the sealing cavity 110, and the stator 200 is fixedly connected to the housing 100, for example as... Figure 2 As shown, the bottom of the stator 200 is connected to the housing 100 via a column 210. The rotor is also located in the sealed cavity 110, and is rotatably connected to the housing 100 via a shaft assembly 600, so that the rotor can rotate relative to the stator 200 and the housing 100.

[0036] Furthermore, the shaft assembly 600 is equipped with a flow channel S1 and a return channel S2 for transporting the cooling medium. The cooling medium can be selected according to actual needs, such as cooling oil used in drone motors. An oil pump 400 is located within the collection area 111. The input end of the flow channel S1 is adjacent to the collection area 111, and the output port of the oil pump 400 is connected to the input end of the flow channel S1. The output end of the flow channel S1 is located outside the sealed cavity 110. When the oil pump 400 is in operation, its input port draws in the cooling medium from the collection area 111 and delivers it to the flow channel S1 through its output port. The delivery pipe 500 is exposed outside the sealed cavity 110, and during assembly, the delivery pipe 500 can connect the flow channel S1 and the return channel S2.

[0037] Meanwhile, the input end of the return channel S2 is located outside the sealed cavity 110, and the output end of the return channel S2 is located inside the sealed cavity 110. The delivery pipe 500, exposed outside the sealed cavity 110, cools the transmitted cooling medium under the influence of the external environment. The cooling medium can then flow into the return channel S2 through its input end and exit from its output end. The output end of the return channel S2 is arranged radially in a direction perpendicular to the rotor's rotation axis. The cooling medium output from the output end of the return channel S2 diffuses around the sealed cavity 110. Simultaneously, the output end of the return channel S2 is configured so that the output cooling medium can flow from top to bottom through the winding 310 between the stator 200 and the rotor. This ensures that the entire winding 310 is in full contact with the cooling medium, effectively cooling the winding 310, which generates significant heat.

[0038] It should be understood that the oil pump 400 is located within the collection area 111. This can mean that the oil pump 400 is partially located within the collection area 111, but it is necessary to ensure that the inlet of the oil pump 400 can draw in the cooling medium within the collection area 111. For example, the inlet of the oil pump 400 can be located at the lowest position of the collection area 111. Of course, the oil pump 400 can also be completely located within the collection area 111, for example, the oil pump 400 can be completely submerged in the cooling medium within the collection area 111.

[0039] It is also understandable that the housing 100 and the conveying pipe 500 can be made of materials with good thermal conductivity, such as aluminum alloy, stainless steel, copper, etc., so that part of the heat generated by the winding 310 is conducted away through the housing 100, and the other part is carried away by the cooling medium and conducted to the external environment through the heat exchange with the external environment through the conveying pipe 500.

[0040] The rotor motor with active cooling provided in the embodiments of this application uses an integrated oil pump 400 to drive the cooling medium to flow in a closed channel. The cooling medium can form a flow path from top to bottom and circumferentially radiating within the closed channel, which can uniformly contact the core heat-generating element winding 310 between the stator 200 and the rotor. This allows the heat inside the motor to be quickly and evenly removed, effectively preventing the formation of local hot spots and improving the overall heat dissipation capacity. It solves the problem of low heat dissipation efficiency of traditional air-cooling solutions under low airflow conditions such as hovering and low-speed climbing, ensuring that the motor can maintain stable heat dissipation performance and operating temperature. At the same time, the collection area 111 designed at the bottom of the housing 100, together with the oil pump 400 located therein, ensures that the flowing cooling medium can be effectively collected and pumped back into the closed channel, improving the utilization rate of the cooling medium, avoiding pollution problems that may be caused by medium leakage, and enhancing the reliability of the system.

[0041] Reference Figure 2 and Figure 4 In some embodiments, the pivot assembly 600 includes an outer shaft 610 and an inner shaft 620.

[0042] Specifically, the outer shaft 610 is rotatably connected to the housing 100 via the first bushing 630. An assembly hole can be provided on the top of the housing 100. During assembly, the first bushing 630 is snapped into the assembly hole, and the outer shaft 610 is clearance-fitted into the mounting hole of the first bushing 630.

[0043] The outer shaft 610 is rotatably connected to the stator 200 via a second bushing 640. An assembly hole can be provided on the stator 200, and the second bushing 640 is fitted into the assembly hole of the stator 200 with a clearance fit, allowing the second bushing 640 to rotate relative to the stator 200. The outer shaft 610 has a first receiving cavity 611 inside, and a first opening 612 communicating with the first receiving cavity 611 at its lower end. During assembly, the edge of the first opening 612 is fitted into the mounting hole of the second bushing 640, allowing the outer shaft 610 to rotate with the second bushing 640. The upper outer circumferential surface of the outer shaft 610 also has a return hole 613 communicating with the first receiving cavity 611. The number of return holes 613 can be set according to the number of rotor blades, and the return holes 613 are connected to one end of the delivery pipe 500.

[0044] The diameter of the inner shaft 620 is smaller than that of the outer shaft 610. During assembly, the upper end of the inner shaft 620 can extend into the first receiving cavity 611, connecting the inner shaft 620 and the outer shaft 610 together, allowing them to rotate synchronously and coaxially. It is understood that the inner shaft 620 and the outer shaft 610 can be manufactured as a single piece, assembled together using fasteners, or fixed together using other methods.

[0045] Furthermore, the inner shaft 620 has a second accommodating cavity 621 inside, which forms a flow channel S1. The upper outer circumferential surface of the inner shaft 620 has a flow hole 622 communicating with the second accommodating cavity 621. The flow hole 622 also communicates with the other end of the delivery pipe 500. The number of flow holes 622 can be set according to the number of rotor blades. The lower end of the inner shaft 620 is adjacent to the collection area 111. The lower end of the inner shaft 620 has a second opening 623 communicating with the second accommodating cavity 621. The second opening 623 is connected to the output end of the oil pump 400. The second bushing 640 has nozzles 641 spaced around its circumference, and the nozzles 641 communicate with the first accommodating cavity 611.

[0046] The rotor motor with active cooling provided in the embodiments of this application has a cooling medium output from the output end of the oil pump 400 entering the second accommodating cavity 621 through the second opening 623, and then entering the delivery pipe 500 through the delivery hole 622. After the cooling medium in the delivery pipe 500 is cooled, it flows into the first accommodating cavity 611 through the return hole 613 and is sprayed out from the spray hole 641 to the surrounding area.

[0047] Reference Figure 2 and Figure 5In some embodiments, in order to prevent the cooling medium in the first accommodating cavity 611 from leaking to the outside of the second bushing 640, a stop 624 is provided on the inner shaft 620. During assembly, the stop 624 presses tightly against the wall of the mounting hole of the second bushing 640. At this time, the stop 624, the wall of the mounting hole of the second bushing 640, and the first accommodating cavity 611 form a return channel S2.

[0048] Reference Figure 4 In some embodiments, the top of the stator 200 is spaced from the housing 100, so that the cooling medium ejected from the nozzle 641 has sufficient flow space when it is ejected in all directions. Under pressure and centrifugal force, it can move radially toward the mounting area of ​​the winding 310 between the stator 200 and the rotor. Under gravity, the cooling medium can flow from top to bottom through the winding 310 between the stator 200 and the rotor. This ensures that the entire winding 310 is in full contact with the medium being cooled, so that the winding 310 with a large amount of heat is effectively cooled.

[0049] To fix winding 310, refer to... Figure 2 In some embodiments, a cover plate 320 is provided on the rotor, the cover plate 320 is located between the top of the stator 200 and the housing 100, and the cover plate 320 is connected to the second bushing 640, and the winding 310 is fixed to the circumferential edge of the cover plate 320.

[0050] To facilitate the installation and removal of the cover plate 320, in some embodiments, the cover plate 320 is detachably connected to the second bushing 640.

[0051] Reference Figure 3 In some embodiments, a flange 642 is fitted onto the second bushing 640, and the cover plate 320 includes a fixed seat 321 and a plurality of partitions 322. The fixed seat 321 is fixed to the flange 642 by fasteners (e.g., screws), and the winding 310 on the rotor is connected to the fixed seat 321 through the partitions 322.

[0052] The rotor motor with active cooling provided in the embodiments of this application has a partition 322 directly connected to the winding 310 on the rotor, providing it with robust mechanical support and fixation. This effectively prevents the winding 310 from loosening or deforming under high-speed rotation and electromagnetic force, ensuring the reliability of the motor's long-term operation. Simultaneously, the hollow area formed between adjacent partitions 322 avoids the solid cover 320 from shielding heat radiation, allowing some of the heat generated by the winding 310 to be transferred upwards in the form of radiation and finally dissipated through the top of the housing 100. Moreover, this hollow area can form an air convection channel; by utilizing the airflow disturbance caused by the rotation of the partition 322, the accumulated heat can be assisted in being conducted upwards to the top of the housing 100 and dissipated.

[0053] Reference Figure 4In some embodiments, the nozzle 641 penetrates both the flange 642 and the mounting base 321, forming a continuous, radially distributed, straight-line spray channel between the flange 642 and the mounting base 321 at the nozzle 641 location. This allows the cooling medium to be ejected quickly with minimal energy loss, eliminating the need for additional sealing interfaces or alignment adjustments between the two parts. This reduces potential leakage points and improves sealing reliability and assembly consistency. For example, by properly positioning the through-hole area on the mounting base 321, during the process of fixing the mounting base 321 to the flange 642 with screws, when the threaded holes between the mounting base 321 and the flange 642 are aligned, the through-hole area on the mounting base 321 is also aligned with the nozzle 641, eliminating the need for additional fine-tuning of the position between the mounting base 321 and the flange 642.

[0054] Reference Figure 2 and Figure 3 In some embodiments, multiple partitions 322 are arranged radially in a direction perpendicular to the rotation axis of the rotor, and the area between adjacent partitions 322 is aligned with the position of a corresponding nozzle 641.

[0055] The rotor motor with active cooling provided in the embodiments of this application has multiple partitions 322 arranged evenly and radially along the circumference, forming several independent fan-shaped areas on the top of the rotor. The nozzles 641 are precisely set between adjacent partitions 322, with each nozzle 641 facing a dedicated fan-shaped area. This design forces the cooling medium ejected from the nozzles 641 to flow only along the straight radial path defined by the partitions 322, which can eliminate circumferential crosstalk and random flow of the cooling medium to a certain extent, and achieve uniform coverage of the winding 310 mounting area.

[0056] To ensure that the cooling medium can flow quickly through the winding 310 between the stator 200 and the rotor, refer to Figure 1 and Figure 2 In some embodiments, a slope 120 is provided on the circumferential surface of the housing 100 at a position corresponding to the nozzle 641. When the cooling medium is sprayed out radially from the nozzle 641 of the high-speed rotating second bushing 640, the slope 120 can effectively change the reflection or flow direction of the cooling medium after it impacts the housing 100, actively guiding the cooling medium that might otherwise be randomly scattered toward the mounting area of ​​the winding 310 between the stator 200 and the rotor, so that the winding 310 obtains a better coverage effect.

[0057] Reference Figure 5In some embodiments, the second bushing 640 is rotatably connected to the stator 200 via bearings. The bearings have extremely high radial and axial positioning accuracy, and the bearing connection can precisely maintain the relative position between the second bushing 640 and the stator 200. It is understood that the number of bearings can be selected according to actual conditions. For example, a first bearing 220 and a second bearing 230 are provided on the stator 200.

[0058] Reference Figure 4 In some embodiments, the inner shaft 620 is provided with a locking member 700 at one end near the collection area 111, and the locking member 700 abuts against the inner ring of the second bearing 230.

[0059] Reference Figure 4 In some embodiments, the locking member 700 includes a locking shaft 710 and a locking sleeve 720. The locking shaft 710 is sleeved on the inner shaft 620, and the locking sleeve 720 is threadedly connected to the locking shaft 710. This allows for easy replacement of different locking sleeves 720 to match different assembly requirements.

[0060] The rotor motor with active cooling provided in the embodiments of this application has a locking member 700 that directly abuts against the inner ring side end face of the second bearing 230, applying a rigid and defined axial constraint to the assembly of the inner shaft 620 and the bearing inner ring. This can effectively resist the axial inertial force and impact force generated when the motor starts, stops, changes speed, or is subjected to external impact, and prevent the bearing inner ring from axially moving relative to the inner shaft 620.

[0061] Reference Figure 6 and Figure 7 The second aspect of this application also provides a rotor power system, including a rotor 800 and a rotor motor with active cooling of any of the aforementioned structures, wherein the rotor 800 is connected to a rotor and a delivery pipe 500 is disposed on the rotor 800.

[0062] The rotor propulsion system provided in this embodiment integrates the aforementioned rotor motor with active cooling with the rotor 800 to construct a highly integrated flight propulsion unit. Specifically, the rotor 800 is used as a key component of the heat dissipation circuit (the delivery pipe 500 is located on the rotor 800). When the cooling medium flows in the delivery pipe 500 on the rotor 800, it is directly subjected to the dual effects of the centrifugal force of the rotor 800's rotation and the oncoming airflow. This not only promotes the flow of the cooling medium in the pipe and enhances heat exchange, but more importantly, the rotor blades of the rotor 800 are equivalent to a high-speed rotating "forced air-cooled radiator" during flight. Its huge surface area and continuous high-speed airflow make the heat dissipation efficiency exceed that of any static or miniaturized additional radiator. Moreover, compared with independent external radiators or complex external piping, it not only provides excellent heat dissipation capabilities, but also achieves the ultimate power-to-weight ratio and compactness at the power system level, thus providing core support for the overall weight reduction and layout optimization of the aircraft.

[0063] Reference Figure 7 In some embodiments, a fairing 900 is provided at the root of the rotor, and a delivery pipe 500 is provided on the windward side of the fairing 900. It is understood that the delivery pipe 500 and the fairing 900 can be manufactured as a single piece, assembled together by fasteners, embedded in the windward side of the fairing 900, or fixed together by other means, such as welding.

[0064] The rotor power system provided in this embodiment can optimize the airflow at the root of the rotor 800 and reduce aerodynamic drag by setting up a fairing 900. At the same time, the delivery pipe 500 is set on the windward side of the fairing 900, which can continuously withstand the high-speed cooling airflow during flight. When the cooling medium flows through this section of the pipe, its heat can be quickly carried away by the high-speed airflow through the pipe wall with a high convective heat transfer coefficient, thereby improving the heat dissipation capacity.

[0065] Preferably, the delivery pipe 500 is fitted into or onto the windward side of the fairing 900, making it part of the fairing 900's shape rather than an external attachment, thus avoiding additional aerodynamic drag. Of course, the local airflow can also be improved by optimizing the streamlined shape of the delivery pipe 500.

[0066] A third aspect of this application also provides an aircraft that utilizes a rotor propulsion system with any of the aforementioned structures.

[0067] The aircraft according to the embodiments of the present invention can reduce the temperature rise of the rotor motor when operating at high power, based on the high heat dissipation capacity and structural characteristics of the aforementioned rotor power system, thereby reducing the efficiency degradation caused by overheating.

[0068] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A rotor motor with active heat dissipation, characterized in that, include: The housing has a sealed cavity inside, and the bottom of the sealed cavity has a downwardly recessed collection area; The stator is disposed within the sealed cavity and is fixedly connected to the housing; The rotor is disposed within the sealed cavity and is rotatably connected to the housing via a rotating shaft assembly, the rotating shaft assembly being provided with a flow channel and a return channel for transporting the cooling medium; An oil pump, located within the collection area, is used to transport the cooling medium within the collection area to the delivery channel; A delivery pipe, exposed outside the sealed cavity, is used to connect the delivery channel and the return channel; The input end of the flow channel is located adjacent to the collection area, the output end of the flow channel is located outside the sealed cavity, the input end of the return channel is located outside the sealed cavity, and the output end of the return channel is located inside the sealed cavity and is arranged radially in a direction perpendicular to the rotation axis of the rotor. The output end of the return channel is configured such that the output cooling medium can flow from top to bottom through the winding between the stator and the rotor. The rotating shaft assembly includes: An outer shaft is rotatably connected to the housing via a first bushing and to the stator via a second bushing. The outer shaft has a first accommodating cavity inside, a first opening communicating with the first accommodating cavity at one end, and a reflux hole communicating with the first accommodating cavity at the other end. The reflux hole is connected to one end of the conveying pipe. An inner shaft, the diameter of which is smaller than that of the outer shaft, has a second accommodating cavity inside, one end of which extends into the first accommodating cavity and is connected to the outer shaft, and has a flow hole communicating with the other end of the conveying pipe, the other end of which is located adjacent to the collection area and has a second opening communicating with the second accommodating cavity, the second opening being connected to the output end of the oil pump; The second bushing is provided with spray holes spaced apart along its circumference, and the spray holes are in communication with the first accommodating cavity.

2. The rotor motor with active heat dissipation according to claim 1, characterized in that, The top of the stator is separated from the housing, and the rotor is provided with a cover plate, which is located between the top of the stator and the housing, and the cover plate is connected to the second bushing.

3. The rotor motor with active heat dissipation according to claim 2, characterized in that, The cover plate is detachably connected to the second bushing.

4. The rotor motor with active heat dissipation according to claim 2, characterized in that, A flange is fitted onto the second bushing. The cover plate includes a fixed seat and multiple partitions. The fixed seat is connected to the flange. The nozzle passes through the flange and the fixed seat. The windings on the rotor are connected to the fixed seat through the partitions. The multiple partitions are arranged radially in a direction perpendicular to the rotation axis of the rotor, and the area between adjacent partitions is aligned with the position of a corresponding nozzle.

5. The rotor motor with active heat dissipation according to claim 2, characterized in that, The second bushing is rotatably connected to the stator via a bearing.

6. The rotor motor with active heat dissipation according to claim 5, characterized in that, The inner shaft is provided with a locking element at one end near the collection area, and the locking element abuts against the inner ring of the bearing.

7. A rotor propulsion system, characterized in that, The rotor includes a rotor and a rotor motor with active cooling as described in any one of claims 1 to 6, wherein the rotor is connected to the rotor and the delivery pipe is disposed on the rotor.

8. The rotor propulsion system according to claim 7, characterized in that, The rotor is provided with a fairing at its root, and the delivery pipe is located on the windward side of the fairing.

9. An aircraft, characterized in that, The rotor power system as described in claim 7 or 8 is applied.

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