CN116505678B

CN116505678B - Motor, propulsion system and aircraft

Info

Publication number: CN116505678B
Application number: CN202310741724.0A
Authority: CN
Inventors: 薛松柏; 李清; 易礼杰
Original assignee: Chengdu Wofeitianyu Technology Co ltd; Zhejiang Geely Holding Group Co Ltd
Current assignee: Chengdu Wofeitianyu Technology Co ltd; Zhejiang Geely Holding Group Co Ltd
Priority date: 2023-06-21
Filing date: 2023-06-21
Publication date: 2023-10-27
Anticipated expiration: 2043-06-21
Also published as: CN116505678A

Abstract

The invention discloses a motor, a propulsion system and an aircraft, wherein the motor comprises a stator, a rotor and a cooling system, the stator comprises an outer shell, a stator iron core, a coil and an inner shell, the stator iron core is arranged on the inner side wall of the outer shell, the coil is arranged on the stator iron core, and the inner shell is arranged on one side of the stator iron core, which is far away from the outer shell, and is fixed with the outer shell; one end of the rotor is rotationally connected with the outer shell through a first bearing, and the other end of the rotor is rotationally connected with the inner shell through a second bearing; the cooling system comprises an air cooling structure and a liquid cooling structure, wherein the air cooling structure is arranged on the rotor and the stator, and the liquid cooling structure is arranged on the stator. The technical scheme of the invention not only can improve the heat dissipation efficiency of the motor, but also can increase the utilization rate of space.

Description

Motor, propulsion system and aircraft

Technical Field

The invention relates to the technical field of aircrafts, in particular to a motor, a propulsion system and an aircraft.

Background

At present, the motor can produce a large amount of heat when using, if can not in time distribute away the heat will influence the normal use of motor, can not satisfy the performance demand of aircraft.

In particular, when the aircraft is required to fly with various poses at maximum throttle, such as: fast climbing, wind-resistant flight, violent flight and the like, the motor is required to drive the propeller to rotate at a high speed, and when the motor runs under a large load, the engine body of the motor generates larger heat. If the heat dissipation effect of the motor is poor at this time, the temperature of the motor is too high when the aircraft works at the maximum accelerator, so that the magnet is invalid due to high temperature, the performance and efficiency of the motor are reduced, and the flight of the aircraft is affected.

Disclosure of Invention

The invention mainly aims to provide a motor, which aims to improve the heat dissipation efficiency of the motor.

In order to achieve the above object, the present invention provides an electric motor comprising:

the stator comprises an outer shell, a stator core, a coil and an inner shell, wherein the stator core is arranged on the inner side wall of the outer shell, the coil is arranged on the stator core, and the inner shell is arranged on one side of the stator core, which is away from the outer shell, and is fixed with the outer shell;

one end of the rotor is rotationally connected with the outer shell through a first bearing, and the other end of the rotor is rotationally connected with the inner shell through a second bearing; and

the cooling system comprises an air cooling structure and a liquid cooling structure, the air cooling structure is arranged on the rotor and the stator, and the liquid cooling structure is arranged on the stator.

Optionally, the cooling system includes a plurality of cooling fins, and the plurality of cooling fins are arranged on the outer wall surface of the shell at intervals.

Optionally, the liquid cooling structure includes a first runner and a radiating pipe that communicate with each other, the first runner is provided on a wall of the housing, and the radiating pipe passes through the radiating fin.

Optionally, a heat exchange groove is arranged between the stator core and the shell, and the first flow passage is communicated with the radiating pipe through the heat exchange groove.

Optionally, the liquid cooling structure further comprises a circulating pump, a liquid outlet of the circulating pump is communicated with the first flow channel, and a liquid inlet of the circulating pump is communicated with the radiating pipe.

Optionally, the stator further comprises a shell cover covering the opening of the shell, the shell cover is provided with a second flow channel, and the liquid outlet of the circulating pump is communicated with the first flow channel through the second flow channel.

Optionally, the inner shell is provided with a third flow channel, and the liquid outlet of the circulating pump is communicated with the second flow channel through the third flow channel.

Optionally, the casing cover is provided with a liquid passing port, and the liquid outlet of the circulating pump is communicated with the third flow passage through the liquid passing port.

Optionally, the shell cover is further provided with a fourth flow channel, and the radiating pipe is communicated with the liquid inlet of the circulating pump through the fourth flow channel.

Optionally, the air cooling structure comprises a first air cooling channel arranged on the rotor, and an air inlet and an air outlet arranged at two ends of the shell, wherein the air inlet and the air outlet are respectively communicated with the first air cooling channel.

Optionally, the rotor includes a rotor core and a plurality of magnet steel, and the rotor core is equipped with a recess corresponding to each magnet steel, and the magnet steel is located in the recess, and first forced air cooling passageway is located between the lateral wall of magnet steel and recess.

Optionally, the air cooling structure includes a second air cooling channel, and the second air cooling channel is formed between any two heat dissipation fins.

Optionally, the motor further comprises a rear cover, the rear cover is connected with the shell and is arranged close to the air outlet, the rear cover is provided with a vent, and the first vent is communicated with the air outlet and the second air cooling channel.

Optionally, the rear cover is provided with a plurality of cooling fans.

Optionally, the stator further comprises a sealing ring, and the sealing ring covers the stator core.

The invention also provides a propulsion system which comprises a controller and the motor, wherein the controller is connected with the bottom plate of the inner shell of the motor.

Optionally, the controller includes a plurality of groups of independent power modules, and a coil is arranged on a stator of the motor corresponding to one power module.

Optionally, the propulsion system further comprises a propeller mechanism and a guide cover, wherein a hub of the propeller mechanism and the guide cover are connected with a rotor of the motor, a second air vent is formed between the guide cover and the hub, and the second air vent is respectively communicated with an air inlet of the motor and a second air cooling channel of the motor.

The invention also provides an aircraft, which comprises the propulsion system.

The motor at least comprises the following beneficial effects:

according to the technical scheme, an air cooling structure of a cooling system is arranged in a rotor and a stator, and a liquid cooling structure is arranged in the stator; the air cooling structure can increase the flow speed and flow rate of cold air outside the motor in the stator, so that the cold air is utilized to take away heat generated when the stator and the rotor work; the liquid cooling structure can take away heat generated by the stator and the rotor during working by using cooling liquid; the double cooling system such as the air cooling structure and the liquid cooling structure is arranged in the motor, so that heat generated during the operation of the motor can be taken away in time, the heat exchange efficiency is improved, the heat dissipation efficiency of the motor is improved, and the burning caused by overheating of the motor is avoided; moreover, the air cooling structure is integrated on the rotor and the stator, and the liquid cooling structure is integrated on the stator, so that parts are reduced, the space utilization rate is increased, the anti-interference performance is improved, and the reliability is improved; the weight of the motor is reduced, and the lightweight design is facilitated; therefore, the technical scheme of the invention not only can improve the heat dissipation efficiency of the motor, but also can increase the utilization rate of space.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an exploded view of one embodiment of a propulsion system of the present invention;

FIG. 2 is a schematic cross-sectional structural view of the propulsion system of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic diagram of an exploded view of an embodiment of the motor of the present invention;

FIG. 5 is a schematic view of a partial cross-sectional structure of a stator of the motor of FIG. 4;

FIG. 6 is a partial enlarged view at B in FIG. 5;

FIG. 7 is a schematic view in partial cross-section of a housing of a stator of the motor of FIG. 4;

FIG. 8 is an enlarged view of a portion of FIG. 7 at C;

FIG. 9 is a schematic view of a partial cross-sectional structure of a rotor of the motor of FIG. 4;

FIG. 10 is a schematic view of the stator inner casing of the motor of FIG. 4;

FIG. 11 is a schematic view of the structure of the housing cover of the motor of FIG. 4 from a view angle;

fig. 12 is a schematic view of a structure of another view of the housing cover of the motor of fig. 4.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The invention provides a motor.

Referring to fig. 2 to 4, in an embodiment of the present invention, the motor 100 includes a stator 110, a rotor 120 and a cooling system 200, the stator 110 includes an outer shell 111, a stator core 112, a coil 113 and an inner shell 114, the stator core 112 is disposed on an inner side wall of the outer shell 111, the coil 113 is disposed on the stator core 112, and the inner shell 114 is disposed on a side of the stator core 112 facing away from the outer shell 111 and is fixed with the outer shell 111; one end of the rotor 120 is rotatably connected to the outer case 111 through a first bearing 600, and the other end is rotatably connected to the inner case 114 through a second bearing 700; the cooling system 200 includes an air cooling structure 210 and a liquid cooling structure 220, the air cooling structure 210 is disposed on the rotor 120 and the stator 110, and the liquid cooling structure 220 is disposed on the stator 110.

Specifically, the air cooling structure 210 of the cooling system 200 is disposed between the rotor 120 and the stator 110, and the liquid cooling structure 220 is disposed in the stator 110; the air cooling structure 210 can increase the flow rate and flow rate of the external cold air flowing into the stator 110 of the motor 100 in the stator 110, so that the cold air is utilized to take away the heat generated during the operation of the stator 110 and the rotor 120; the liquid cooling structure 220 can take away heat generated during the operation of the stator 110 and the rotor 120 by using cooling liquid; the dual cooling system 200 such as the air cooling structure 210 and the liquid cooling structure 220 is arranged in the motor 100, so that generated heat can be taken away in time, and the heat exchange efficiency is improved, thereby improving the heat dissipation efficiency of the motor 100 and further avoiding burning caused by overheat of the motor 100; moreover, the air cooling structure 210 is integrated on the rotor 120 and the stator 110, and the liquid cooling structure 220 is integrated on the stator 110, so that not only are parts reduced, but also the space utilization rate is increased, the anti-interference performance is improved, and the reliability is improved; the weight of the motor 100 is also reduced, contributing to a lightweight design; therefore, the technical scheme of the invention not only can improve the heat dissipation efficiency of the motor 100, but also can increase the space utilization rate.

The cooling liquid may be a single cooling agent (e.g., water/glycol mixture, oil, etc.) or a mixture of a plurality of cooling agents.

Furthermore, one end of the rotor 120 is rotatably connected to the outer case 111 through the first bearing 600, and the other end is rotatably connected to the inner case 114 through the second bearing 700, because the friction damping of the bearing is small, the starting is flexible, and the bearing works stably with low noise, so that the noise of the motor 100 can be reduced.

Further, the stator core 112 is circumferentially and uniformly provided with teeth and yokes, and the coil 113 is wound on the stator core 112 teeth in the axial direction.

Further, the coil 113 is configured as an exciting coil, and the inside of the exciting coil has a double winding structure formed by two sets of coils independently.

Further, the outer side wall of the stator core 112 is assembled with the inner side wall of the housing 111 in an interference fit manner, however, the invention is not limited thereto, and in other embodiments, the outer side wall of the stator core 112 may be assembled with the inner side wall of the housing 111 in an adhesive manner.

Referring to fig. 9, further, the rotor 120 includes a rotor bracket 121 and a rotor core 122, and an outer sidewall of the rotor bracket 121 is assembled with an inner sidewall of the rotor core 122 in an interference fit manner. Of course, the present invention is not limited thereto, and in other embodiments, the outer sidewall of the rotor support 121 and the inner sidewall of the rotor core 122 are assembled into one body by bonding.

Further, the rotor 120 further includes a magnetic steel 123, and the magnetic steel 123 is disposed on the rotor core 122.

Referring to fig. 4 to 8, alternatively, the cooling system 200 includes a plurality of cooling fins 230, and the plurality of cooling fins 230 are spaced apart from an outer wall surface of the housing 111; it can be appreciated that the heat dissipation efficiency of the stator 110 can be improved by the heat dissipation fins 230, so as to avoid burning out caused by overheating of the motor 100. Of course, the present invention is not limited thereto, and in other embodiments, the heat sink 230 may not be provided.

Further, the stator 110 further includes a protection ring, and an inner side wall of the protection ring is connected to a side of the heat sink 230 away from the housing 111, so as to form a heat dissipation channel between any two heat sinks 230, which can play a role in protecting the heat sink 230.

Optionally, the liquid cooling structure 220 includes a first flow channel 221 and a heat dissipating tube 222, where the first flow channel 221 is disposed on a wall of the housing 111, and the heat dissipating tube 222 passes through the heat dissipating fin 230; it can be appreciated that the first flow channel 221 is disposed in the wall of the housing 111, so that the first flow channel 221 is prevented from protruding from the side wall of the housing 111, and the space utilization of the stator 110 is increased; in addition, the radiating pipe 222 passes through the radiating fin 230, and the radiating fin 230 increases the radiating area, so that the temperature of the cooling liquid in the radiating pipe 222 can be reduced with higher efficiency, thereby completing the cooling of the cooling liquid. Of course, the present invention is not limited thereto, and in other embodiments, the liquid cooling structure 220 includes a heat exchanging channel and a cooling tube, wherein the heat exchanging channel is disposed between the housing 111 and the core of the stator 110, and the cooling tube passes through the cooling fin 230.

Further, the first flow passage 221 is spirally disposed in the sidewall height direction of the housing 111, so that the heat exchange area of the first flow passage 221 can be increased, thereby increasing the heat dissipation efficiency of the motor 100.

Further, the heat dissipating pipe 222 is spirally disposed in the height direction of the sidewall of the housing 111, and sequentially passes through the heat dissipating fins 230, so that the heat exchanging area of the first flow channel 221 can be increased, thereby increasing the heat dissipating efficiency of the motor 100.

Further, the first liquid inlet 221a of the first flow channel 221 is disposed on the end surface of the first end of the housing 111, and the first liquid outlet 221b of the first flow channel 221 is disposed on the inner wall surface of the housing 111.

Further, the heat dissipation liquid outlet 222b of the heat dissipation tube 222 is disposed facing the end surface of the first end of the housing 111, and the heat dissipation liquid inlet 222a of the heat dissipation tube 222 is disposed on the inner wall surface of the housing 111.

Further, the heat dissipation liquid inlet 222a is disposed near the end face of the first end of the housing 111, because the first end face is located at a lower position when the motor 100 is running, and the heat dissipation liquid inlet 222a is disposed near the end face of the first end of the housing 111, so that the heat dissipation liquid can automatically flow downwards and flow into the heat dissipation tube 222 by using the gravity principle.

Furthermore, the plurality of first liquid outlets 221b are provided, and the plurality of first liquid outlets 221b are arranged at intervals, so that the liquid outlet amount is improved, and the heat exchange efficiency is improved.

Optionally, a heat exchange groove 223 is disposed between the stator core 112 and the housing 111, and the first flow channel 221 is communicated with the heat dissipating tube 222 through the heat exchange groove 223, it can be understood that the heat exchange groove 223 is disposed between the stator core 112 and the housing 111, and the cooling liquid in the heat exchange groove 223 can directly contact with the stator core 112, so as to take away the heat generated by the stator core 112 and the coil 113, avoid the heat passing through the side wall of the housing 111, and exchange heat, and reduce the heat exchange distance, thereby increasing the heat dissipating efficiency of the motor 100. Of course, the present invention is not limited thereto, and in other embodiments, the heat exchange may be performed directly by using the wall of the housing 111 without providing the heat exchange groove 223.

The stator core 112 is fixed to the housing 111, the heat exchanging groove 223 is provided on an outer wall surface of the stator core 112, the housing 111 covers a notch of the heat exchanging groove 223, the heat exchanging groove 223 communicates with the first flow channel 221 through the first liquid outlet 221b, and the heat exchanging groove 223 communicates with the heat dissipating pipe 222 through the heat dissipating liquid inlet 222 a. Of course, the present invention is not limited to this, and in the second embodiment, the heat exchanging groove 223 may be provided on the inner wall surface of the housing 111, and the stator core 112 may cover the notch of the heat exchanging groove 223. Of course, the present invention is not limited to this, in the third embodiment, the outer side wall of the stator core 112 and the inner side wall of the housing 111 are both provided with heat dissipation grooves, and the two heat dissipation grooves cover the notch to form a heat dissipation channel between the stator core 112 and the housing 111.

Optionally, the liquid cooling structure 220 further includes a circulation pump 224, a liquid outlet of the circulation pump 224 is communicated with the first flow channel 221, and a liquid inlet of the circulation pump 224 is communicated with the heat dissipating tube 222, it is understood that the circulation pump 224 can cool the cooling liquid in the heat dissipating tube 222 by the cooling fin 230, and then the cooling liquid enters the first flow channel 221 through the circulation pump 224 to continue heat exchange, so that an external environmental control system is not needed in the liquid cooling structure 220, parts of the system are reduced, and therefore the weight of the motor 100 is reduced. Of course, the present invention is not limited thereto, and in other embodiments, the liquid cooling structure 220 may also include an external cooling pipe, and the cooling pipe guides the cooling liquid into the first flow channel 221 and guides the heat-exchanged high-temperature cooling liquid in the heat dissipating tube 222.

It should be noted that, when the motor 100 is used in an electric propulsion system, the liquid cooling structure is integrated in the stator of the motor, which can reduce the weight of the electric propulsion system and facilitate the lightweight design; and the space utilization rate is increased, so that the electric propulsion power density is effectively improved.

Referring to fig. 11 and 12, optionally, the stator 110 further includes a housing cover 115 covering the opening of the housing 111, the housing cover 115 is provided with a second flow passage, and the liquid outlet of the circulation pump 224 is communicated with the first flow passage 221 through the second flow passage; it can be appreciated that the arrangement of the casing cover 115 is beneficial to forming a protection cavity in the outer casing 111, wherein the protection cavity is used for installing components such as the stator core 112, the inner casing 114, the rotor 120 and the like, so as to prevent the rotor 120 from being exposed to the environment and increase the operation safety of the motor 100, and the arrangement of the second flow passage in the casing cover 115 can prevent a communicating pipe from being arranged between the circulating pump 224 and the first flow passage 221, so that the motor 100 is more compact in structure and beneficial to reducing the volume; furthermore, the second flow channel can increase the contact area between the cooling liquid and the housing cover 115, thereby increasing the heat dissipation efficiency of the housing cover 115. Of course, the present invention is not limited thereto, and in other embodiments, a communication pipe may be provided and used to communicate the circulation pump 224 and the first flow channel 221.

Further, the second liquid outlet 225b of the second flow channel is disposed on the housing cover 115 and corresponds to the first liquid inlet 221a, the first liquid inlet 221a and the second liquid outlet 225b are connected in a sealing manner, and the second liquid inlet 225a of the second flow channel is disposed on the housing cover 115.

Referring to fig. 10, the inner case 114 is optionally provided with a third flow passage 226, and the liquid outlet of the circulation pump 224 communicates with the second flow passage through the third flow passage 226; it can be appreciated that the inner housing 114 is closer to the rotor 120, and the third flow channel 226 is disposed in the inner housing 114, so that the third flow channel 226 can timely take out the heat generated by the rotor 120, thereby increasing the heat dissipation efficiency; of course, the present invention is not limited thereto, and in other embodiments, the third flow channel 226 may not be provided on the inner housing 114, and the heat exchange groove 223 may be directly used to dissipate heat of the rotor 120.

Further, a third liquid inlet 226a of the third flow channel 226 is disposed on the bottom plate of the inner housing 114, a third liquid outlet 226b of the third flow channel 226 is disposed on the bottom plate of the inner housing 114 and corresponds to the second liquid inlet 225a, and the third liquid outlet 226b is connected with the second liquid inlet 225a in a sealing manner.

Optionally, the housing cover 115 is provided with a liquid passing port 227, and the liquid outlet of the circulating pump 224 is communicated with the third flow channel 226 through the liquid passing port 227; it can be appreciated that the liquid outlet of the circulation pump 224 and the third flow channel 226 provided on the inner housing 114 are arranged at intervals, the housing cover 115 is provided therebetween, the liquid passing opening 227 is provided on the housing cover 115, and the liquid passing opening 227 is utilized to communicate the circulation pump 224 and the third flow channel 226, so that the motor 100 is more compact in structure and is beneficial to reducing the volume. Of course, the present invention is not limited thereto, and in other embodiments, a communication pipe may be provided and used to communicate the circulation pump 224 and the third flow channel 226.

The liquid passing port 227 is disposed corresponding to the third liquid inlet 226a, and is connected to the third liquid inlet 226a in a sealing manner.

Optionally, the housing cover 115 is further provided with a fourth flow channel, and the heat dissipating tube 222 is communicated with the liquid inlet of the circulating pump 224 through the fourth flow channel. The fourth flow passage is provided in the housing cover 115 to avoid the communication pipe between the circulation pump 224 and the heat radiating pipe 222, so that the motor 100 has a more compact structure and is beneficial to reducing the volume. Of course, the present invention is not limited thereto, and in other embodiments, the communication pipe may be externally provided and used to communicate the circulation pump 224 and the radiating pipe 222.

Further, a fourth liquid inlet 228a of the fourth flow channel is disposed on the outer ring surface of the housing cover 115 and corresponds to the heat dissipation liquid outlet 222b, the fourth liquid inlet 228a is connected with the heat dissipation liquid outlet 222b in a sealing manner, and a fourth liquid outlet 228b of the fourth flow channel is disposed on the housing cover 115 and is connected with the liquid inlet of the circulation pump 224 in a sealing manner.

The circulation pump 224 is fixed to the housing 111 so as to be integrally connected to the motor 100.

Optionally, the air cooling structure 210 includes a first air cooling channel 211 disposed on the rotor 120, and an air inlet 211a and an air outlet 211b disposed at two ends of the housing 111, where the air inlet 211a and the air outlet 211b are respectively communicated with the first air cooling channel 211; it can be appreciated that the first air cooling channel 211 is provided on the rotor 120, which is beneficial to increasing the flow rate and the flow rate of the cooling air of the rotor 120, thereby being beneficial to increasing the heat dissipation efficiency of the heat generated during the operation of the rotor 120. Of course, the present invention is not limited thereto, and in other embodiments, the air cooling structure 210 may also include a heat dissipation channel disposed on the wall of the inner casing 114, and the heat dissipation channel penetrates through the wall of the inner casing 114 along the width direction of the side wall of the inner casing 114.

Optionally, the rotor 120 includes a rotor core 122 and a plurality of magnetic steels 123, the rotor core 122 is provided with a groove corresponding to each magnetic steel 123, the magnetic steels 123 are disposed in the groove, the first air cooling channel 211 is disposed between the magnetic steels 123 and the side walls of the groove, and such first air cooling channel 211 has a simple structure, is easy to process, and can reduce processing cost. Of course, the present invention is not limited thereto, and in other embodiments, the first air cooling channels 211 may be heat dissipation channels individually dug on the rotor core of the rotor 120.

Further, the air inlet 211a is disposed on the upper wall of the housing 111, and the air outlet 211b is disposed on the housing cover 115.

Optionally, the air cooling structure 210 includes a second air cooling channel 212, where the second air cooling channel 212 is formed between any two heat dissipation fins 230, and it is understood that forming the second air cooling channel 212 between any two heat dissipation fins 230 is beneficial to increase heat dissipation efficiency.

Optionally, the motor 100 further includes a rear cover 130, where the rear cover 130 is connected to the housing 111 and disposed near the air outlet 211b, and the first air vent 213 of the rear cover 130 communicates with the air outlet 211b and the second air cooling channel 212. Of course, the present invention is not limited thereto, and in other embodiments, the rear cover 130 may not be provided.

During operation of the motor 100, a part of the external cool air flows into the first air cooling passage 211 of the housing 111, exchanges heat with the stator 110 and the rotor 120 inside the motor 100, and flows through the air outlet 211b of the housing cover 115 to enter the rear cover 130. Through the first vent 213 of the rear cover 130. Another portion of the external cool air enters the rear cover 130 through the second air cooling passage 212 and finally flows out through the first ventilation opening 213 of the rear cover 130.

Optionally, the rear cover 130 is provided with a plurality of cooling fans 214, and it is understood that the arrangement of the cooling fans 214 is beneficial to accelerating the flow rate and the flow of cooling air, thereby accelerating the heat dissipation efficiency. Of course, the present invention is not limited thereto, and in other embodiments, the heat dissipation fan 214 may not be provided.

Optionally, the stator 110 further includes a sealing ring 116, where the sealing ring 116 covers the stator core 112, and it is understood that the sealing of the coil 113 by the sealing ring 116 can avoid the overflow of the cooling liquid.

Referring to fig. 1 to 3, the present invention also proposes a propulsion system including a controller 500 and a motor 100, wherein the controller 500 is connected to a bottom plate of an inner casing 114 of the motor 100, and it is understood that fixing the controller 500 and the motor 100 as one body can reduce parts of the propulsion system, and the overall durability of the propulsion system is greatly improved, so that the NVH performance of the system is improved, and the anti-interference capability is improved.

Further, the controller 500 is connected to the inner casing 114 of the motor 100, and a third flow channel 226 is disposed on the bottom plate of the inner casing 114, and the third flow channel 226 can take away the heat of the controller 500, so as to avoid overheating and burning of the controller 500.

Optionally, the controller 500 is composed of a power module, a control module, a driving module, and the like.

Further, the power module of the controller 500 is assembled on the surface of the bottom plate, and it can be understood that the power module of the controller 500 is a main heating structure, and the third flow channel 226 is disposed on the bottom plate of the inner housing 114, so that heat generated by the power module can be taken away in time, which is beneficial to improving heat dissipation efficiency.

It should be noted that, when the propulsion system is in operation, the controller 500 receives the dc power transmitted from the battery, the power module in the controller 500 inverts the dc power into three-phase ac power to provide power to the coil 113 of the motor 100, and meanwhile, the heat generated by the controller 500 during the inversion process exchanges heat with the cooling liquid in the third flow channel 226 through the bottom plate of the heat transfer inner casing 114, so as to reduce the temperature of the controller 500.

Optionally, the controller 500 includes multiple groups of independent power modules, and the stator 110 of the motor 100 is provided with a coil 113 corresponding to one power module.

Further, the electrical architecture of the propulsion system is that the stator 110 of the motor 100 is formed by two groups of coils 113 independently to form a double-winding structure, the power module of the controller 500 is formed by two groups of independent modules, and the two groups of independent modules respectively provide electric energy for the two groups of coils 113 of the stator 110 of the motor 100, so that the safety margin of the electrical propulsion system is increased.

Optionally, the propulsion system further includes a propeller mechanism 300 and a pod 400, where the hub 310 and the pod 400 of the propeller mechanism 300 are connected to the rotor 120 of the motor 100, and a second air vent 215 is formed between the pod 400 and the hub 310, and the second air vent 215 is respectively in communication with the air inlet 211a of the motor 100 and the second air-cooling channel 212 of the motor 100.

It should be noted that, when the coil 113 of the motor 100 receives electric energy, the rotor 120 is driven to operate by the electromagnetic induction principle of the magnetic steel 123 of the rotor 120, and then the rotor bracket 121 drives the propeller 320 mechanism 300 to rotate, so as to generate power. Meanwhile, heat is generated during the working process of the stator 110 and the rotor 120, and the air cooling structure 210 and the liquid cooling structure 220 can timely take away the heat during the working process of the stator 110 and the rotor 120, so that the motor 100 is prevented from being burnt out due to overheating.

It should be noted that, the propeller 320 mechanism 300 may employ a variable pitch propeller 320, a fixed pitch propeller 320, or the like according to different usage conditions.

The propeller 320 mechanism 300 includes a hub 310, a propeller 320, and a fairing 330. The hub 310 can be internally provided with different accessories according to the use conditions to realize the functions of distance and pitch change of the propeller 320. The propeller 320 mechanism 300 connects the bottom of the hub 310 to the rotor support 121 via a connection. The pod 400 is mounted coaxially with the hub 310 to the rotor support 121; while a second vent 215 is formed between the pod 400 and the hub 310 of the propeller 320.

Further, during operation of the propulsion system, the cooling process of the air-cooled structure 210 is as follows: first, a part of external cool air enters the propulsion system through the second ventilation opening 215 formed between the guide cover 400 and the hub 310 of the propeller 320, and then a part of external cool air flows into the first air cooling passage 211 of the casing 111, exchanges heat with the stator 110 and the rotor 120 inside the motor 100, flows through the air outlet 211b of the casing cover 115 into the rear cover 130, and flows out through the first ventilation opening 213 of the rear cover 130. Another portion of the external cool air enters the rear cover 130 through the second air cooling passage 212 and finally flows out through the first ventilation opening 213 of the rear cover 130, thereby cooling heat generated when the motor 100 operates.

Further, during operation of the propulsion system, the cooling process of the liquid cooling structure 220 is as follows: firstly, the cooling liquid flows into the liquid passing hole 227 of the shell cover 115 from the liquid outlet of the circulating pump 224, then flows into the third flow channel 226 of the inner shell 114 through the liquid passing hole 227, and meanwhile, the cooling liquid exchanges heat with the heat generated by the controller 500 through the bottom plate when flowing in the third flow channel 226, and the heat of the controller 500 is brought out, so that the purpose of reducing the temperature of the controller 500 is achieved, then, the cooling liquid flows into the second flow channel of the shell cover 115 and then flows into the heat exchange groove 223 through the first flow channel 221, and meanwhile, the cooling liquid exchanges heat with the stator core 112 and the coil 113 when flowing in the heat exchange groove 223, and the heat generated when the motor 100 operates is brought out; then, the heat-exchanged cooling liquid enters the cooling tube 222 to exchange heat with external cooling air, so that the temperature of the cooling liquid in the cooling tube 222 is reduced, the cooled cooling liquid flows into the fourth flow passage of the housing cover 115, and finally returns to the liquid inlet of the circulating pump 224, thereby completing cooling of the cooling liquid.

The invention also provides an aircraft, which comprises a propulsion system, wherein the specific structure of the propulsion system refers to the embodiment, and because the aircraft adopts all the technical schemes of all the embodiments, the aircraft has at least all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted.

The foregoing description of the embodiments of the present invention is merely an optional embodiment of the present invention, and is not intended to limit the scope of the invention, and all equivalent structural modifications made by the present invention in the light of the present invention, the description of which and the accompanying drawings, or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. An electric machine, comprising:

the cooling system comprises an air cooling structure and a liquid cooling structure, the air cooling structure is arranged on the rotor and the stator, and the liquid cooling structure is arranged on the stator;

the air cooling structure comprises a first air cooling channel;

the rotor comprises a rotor core and a plurality of magnetic steels, wherein the rotor core is provided with a groove corresponding to each magnetic steel, and the magnetic steels are arranged in the grooves;

the first air cooling channel is arranged between the magnetic steel and the side wall of the groove; or the first air cooling channel is configured as a heat dissipation channel which is independently dug on the rotor core;

the cooling system comprises a plurality of cooling fins, and the cooling fins are arranged on the outer wall surface of the shell at intervals;

the liquid cooling structure comprises a first flow passage, and the first flow passage is arranged on the wall of the shell;

the air cooling structure comprises a second air cooling channel, and the second air cooling channel is formed between any two radiating fins.

2. The motor of claim 1 wherein said liquid cooled structure includes a cooling tube in communication with said first flow passage, said cooling tube passing through said cooling fin.

3. The motor of claim 2, wherein a heat exchanging groove is provided between the stator core and the housing, and the first flow passage communicates with the radiating pipe through the heat exchanging groove.

4. The motor of claim 2, wherein the liquid cooling structure further comprises a circulation pump, a liquid outlet of the circulation pump is communicated with the first flow channel, and a liquid inlet of the circulation pump is communicated with the radiating pipe.

5. The motor of claim 4 wherein said stator further comprises a housing cover covering said housing opening, said housing cover defining a second flow path, said fluid outlet of said circulation pump communicating with said first flow path through said second flow path.

6. The motor of claim 5, wherein the inner housing is provided with a third flow passage through which a liquid outlet of the circulation pump communicates with the second flow passage.

7. The motor of claim 6, wherein the housing cover is provided with a liquid passing port, and a liquid outlet of the circulation pump is communicated with the third flow passage through the liquid passing port.

8. The motor of claim 5, wherein the cover is further provided with a fourth flow passage, and the radiating pipe is communicated with the liquid inlet of the circulating pump through the fourth flow passage.

9. The motor of claim 1, wherein the air cooling structure comprises an air inlet and an air outlet disposed at two ends of the housing, the air inlet and the air outlet being respectively in communication with the first air cooling passage.

10. The motor of claim 9 further comprising a rear housing coupled to the housing and positioned adjacent the air outlet, the first vent of the rear housing communicating with the air outlet and the second air cooling passage.

11. The motor of claim 10, wherein the rear cover is provided with a plurality of cooling fans.

12. The electric machine of any one of claims 1 to 11, wherein the stator further comprises a seal ring, the seal ring encasing the stator core.

13. A propulsion system comprising a controller and an electric machine as claimed in any one of claims 1 to 12, the controller being connected to a floor of an inner housing of the electric machine.

14. A propulsion system as in claim 13 wherein the controller comprises a plurality of sets of independent power modules, the stator of the motor being provided with a coil corresponding to a power module.

15. The propulsion system of claim 14, further comprising a propeller mechanism and a pod, wherein a hub of the propeller mechanism and the pod are coupled to a rotor of the motor and a second vent is formed between the pod and the hub, the second vent being in communication with an air intake of the motor and a second air-cooled channel of the motor, respectively.

16. An aircraft comprising a propulsion system as claimed in any one of claims 13 to 15.