Motor, propulsion system and aircraft

Abstract

Provided are a motor (100), a propulsion system and an aircraft. The motor (100) comprises a stator (110), a rotor (120), and a cooling system (200); the stator (110) comprises a housing (111); one end of the rotor (120) is rotatably connected to the housing (111) by means of a first bearing (600); the cooling system (200) comprises an air cooling structure (210) and a liquid cooling structure (220); the air cooling structure (210) is arranged on the rotor (120) and the stator (110); and the liquid cooling structure (220) is arranged on the stator (110).

Description

Motors, propulsion systems, and aircraft

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 21, 2023, with application number 202310741724.0 and invention name “Motor, Propulsion System and Aircraft”, the entire contents of which are incorporated by reference into the application. Technical Field

[0002] The present application relates to the field of aircraft technology, and in particular to a motor, a propulsion system and an aircraft. Background Art

[0003] Currently, motors generate a large amount of heat when in use. If the heat cannot be dissipated in time, it will affect the normal use of the motor and cannot meet the performance requirements of the aircraft.

[0004] In particular, when an aircraft needs to fly at full throttle in various maneuvers, such as rapid climbs, wind-resistant flight, and aggressive maneuvers, the motors must drive the propellers at high speeds. When the motors operate at high loads, they generate significant heat. If the motors' heat dissipation is inadequate, the motors will overheat at full throttle, potentially causing the magnets to fail due to the high temperatures. This can reduce the motor's performance and efficiency, and affect the aircraft's flight. Technical issues

[0005] The main purpose of this application is to provide a motor to improve the heat dissipation efficiency of the motor. Technical Solutions

[0006] To achieve the above objectives, the motor proposed in this application includes:

[0007] The stator includes an outer shell, a stator core, a coil, and an inner shell. The stator core is arranged on the inner wall of the outer shell, the coil is arranged on the stator core, and the inner shell is arranged on the side of the stator core away from the outer shell and is fixed to the outer shell;

[0008] a rotor, one end of the rotor being rotatably connected to the outer shell via a first bearing, and the other end of the rotor being rotatably connected to the inner shell via a second bearing; and

[0009] The cooling system includes 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.

[0010] Optionally, the cooling system includes a plurality of heat sinks, which are spaced apart on the outer wall of the housing.

[0011] Optionally, the liquid cooling structure includes a first flow channel and a heat dissipation pipe that are interconnected, the first flow channel is provided on the shell wall of the shell, and the heat dissipation pipe passes through the heat sink.

[0012] Optionally, a heat exchange groove is provided between the stator core and the shell, and the first flow channel is connected to the heat dissipation pipe through the heat exchange groove.

[0013] Optionally, the liquid cooling structure further includes 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 heat dissipation pipe.

[0014] Optionally, the stator further comprises a shell cover covering an opening of the shell, the shell cover is provided with a second flow channel, and the liquid outlet of the circulation pump is connected with the first flow channel through the second flow channel.

[0015] Optionally, the inner shell is provided with a third flow channel, and the liquid outlet of the circulation pump is connected with the second flow channel through the third flow channel.

[0016] Optionally, the shell cover is provided with a liquid outlet, and the liquid outlet of the circulation pump is connected to the third flow channel through the liquid outlet.

[0017] Optionally, the shell cover is further provided with a fourth flow channel, and the heat dissipation pipe is connected with the liquid inlet of the circulation pump through the fourth flow channel.

[0018] Optionally, the air cooling structure includes a first air cooling channel provided on the rotor, and an air inlet and an air outlet provided at both ends of the shell, and the air inlet and the air outlet are respectively connected to the first air cooling channel.

[0019] Optionally, the rotor includes a rotor core and a plurality of magnets, the rotor core is provided with a groove corresponding to each magnet, the magnet is arranged in the groove, and the first air cooling channel is provided between the magnet and the side wall of the groove.

[0020] Optionally, the air cooling structure includes a second air cooling channel, and the second air cooling channel is formed between any two heat sinks.

[0021] Optionally, the motor further includes a rear cover, which is connected to the housing and is arranged close to the air outlet, the rear cover vent, the first vent is connected to the air outlet and the second air cooling channel.

[0022] Optionally, the rear cover is provided with a plurality of cooling fans.

[0023] Optionally, the stator further includes a sealing ring, which covers the stator core.

[0024] The present application also proposes a propulsion system, comprising a controller and the above-mentioned motor, wherein the controller is connected to the bottom plate of the inner shell of the motor.

[0025] Optionally, the controller includes multiple groups of independent power modules, and the stator of the motor is provided with a coil corresponding to each power module.

[0026] Optionally, the propulsion system also includes a propeller mechanism and a fairing, the hub of the propeller mechanism and the fairing are connected to the rotor of the motor, and a second vent is formed between the fairing and the hub, and the second vent is respectively connected to the air inlet of the motor and the second air cooling channel of the motor.

[0027] The present application also proposes an aircraft, comprising the above-mentioned propulsion system. Beneficial effects

[0028] The technical solution of the present application is to arrange the air-cooling structure of the cooling system in the rotor and stator, and the liquid-cooling structure in the stator; the air-cooling structure can increase the flow rate and flow of cold air from the outside of the motor into the stator, thereby using the cold air to take away the heat generated by the stator and rotor when they are working; the liquid-cooling structure can use the coolant to take away the heat generated by the stator and rotor when they are working; the dual cooling system of the air-cooling structure and the liquid-cooling structure is arranged in the motor, which can promptly take away the heat generated during the operation of the motor, improve the heat exchange efficiency, thereby increasing the heat dissipation efficiency of the motor, and thus avoid overheating and burning of the motor; moreover, integrating the air-cooling structure into the rotor and stator, and integrating the liquid-cooling structure into the stator, not only reduces the parts, increases space utilization, improves anti-interference performance, and improves reliability; it also reduces the weight of the motor, which contributes to lightweight design; it can be seen that the technical solution of the present application can not only improve the heat dissipation efficiency of the motor, but also increase space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application 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 application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] FIG1 is a schematic diagram of an exploded structure of an embodiment of a propulsion system of the present application;

[0031] FIG2 is a schematic cross-sectional view of the propulsion system of FIG1 ;

[0032] FIG3 is a partial enlarged view of point A in FIG2 ;

[0033] FIG4 is a schematic diagram of an exploded structure of an embodiment of a motor of the present application;

[0034] FIG5 is a partial cross-sectional structural diagram of the stator of the motor in FIG4 ;

[0035] FIG6 is a partial enlarged view of point B in FIG5 ;

[0036] FIG7 is a partial cross-sectional structural diagram of the stator housing of the motor in FIG4 ;

[0037] FIG8 is a partial enlarged view of point C in FIG7;

[0038] FIG9 is a partial cross-sectional structural diagram of the rotor of the motor in FIG4 ;

[0039] FIG10 is a schematic structural diagram of the stator inner shell of the motor in FIG4 ;

[0040] FIG11 is a schematic structural diagram of the housing cover of the motor in FIG4 from a perspective;

[0041] FIG12 is a schematic structural diagram of the housing cover of the motor in FIG4 from another perspective.

[0042] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

[0043] Implementation Methods of the Application

[0044] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0045] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0046] In this application, 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; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; 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 this application can be understood according to specific circumstances.

[0047] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, 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 it. 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 this application.

[0048] The present application provides a motor.

[0049] 2 to 4 , in one embodiment of the present application, 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 arranged on the inner side wall of the outer shell 111, the coil 113 is arranged on the stator core 112, and the inner shell 114 is arranged on the side of the stator core 112 away from the outer shell 111 and is fixed to the outer shell 111. One end of the rotor 120 is rotatably connected to the outer shell 111 through a first bearing 600, and the other end is rotatably connected to the inner shell 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 arranged on the rotor 120 and the stator 110, and the liquid-cooling structure 220 is arranged on the stator 110.

[0050] In this application, the air cooling structure 210 of the cooling system 200 is arranged in the rotor 120 and the stator 110, and the liquid cooling structure 220 is arranged in the stator 110; the air cooling structure 210 can increase the flow rate and flow rate of the cold air outside the motor 100 flowing into the stator 110, thereby using the cold air to take away the heat generated by the stator 110 and the rotor 120 when they are working; the liquid cooling structure 220 can use the coolant to take away the heat generated by the stator 110 and the rotor 120 when they are working; a dual cooling system such as the air cooling structure 210 and the liquid cooling structure 220 is set in the motor 100 200, can take away the generated heat in time, improve the heat exchange efficiency, thereby increasing the heat dissipation efficiency of the motor 100, and thus avoiding the motor 100 from overheating and burning; moreover, the air-cooling structure 210 is integrated into the rotor 120 and the stator 110, and the liquid-cooling structure 220 is integrated into the stator 110, which not only reduces the parts, increases the space utilization, improves the anti-interference performance, and improves the reliability; it also reduces the weight of the motor 100, which contributes to the lightweight design; it can be seen that the technical solution of the present application can not only improve the heat dissipation efficiency of the motor 100, but also increase the space utilization.

[0051] It should be noted that the coolant may be a single coolant (eg, a water / ethylene glycol mixture, oil, etc.) or a mixture of multiple coolants.

[0052] Furthermore, one end of the rotor 120 is rotatably connected to the outer shell 111 through the first bearing 600, and the other end is rotatably connected to the inner shell 114 through the second bearing 700. This is because the bearing has low friction damping, flexible starting, and stable operation with low noise, which can reduce the noise of the motor 100.

[0053] Furthermore, teeth and yokes are evenly arranged around the circumference of the stator core 112 , and the coil 113 is wound around the teeth of the stator core 112 along the axial direction.

[0054] Furthermore, the coil 113 is configured as an excitation coil, and the interior of the excitation coil is a double-winding structure composed of two groups of coils independently.

[0055] Furthermore, the outer wall of the stator core 112 is assembled into one with the inner wall of the shell 111 by interference fitting. Of course, the present application is not limited to this. In other embodiments, the outer wall of the stator core 112 can also be assembled into one with the inner wall of the shell 111 by bonding.

[0056] 9 , rotor 120 further includes a rotor support 121 and a rotor core 122. The outer wall of rotor support 121 and the inner wall of rotor core 122 are assembled into one piece by interference fit. Of course, the present application is not limited to this. In other embodiments, the outer wall of rotor support 121 and the inner wall of rotor core 122 are assembled into one piece by bonding.

[0057] Furthermore, the rotor 120 further includes a magnet 123 , which is disposed on the rotor core 122 .

[0058] 4 to 8 , the cooling system 200 optionally includes a plurality of heat sinks 230 , which are spaced apart on the outer wall of the housing 111 . It is understood that the provision of the heat sinks 230 can improve the heat dissipation efficiency of the stator 110 , thereby preventing the motor 100 from overheating and burning. Of course, the present application is not limited thereto, and in other embodiments, the heat sinks 230 may not be provided.

[0059] Furthermore, the stator 110 further includes a protective ring, the inner sidewall of which is connected to the side of the heat sink 230 away from the housing 111 to form a heat dissipation channel between any two heat sinks 230 , thereby protecting the heat sink 230 .

[0060] Optionally, the liquid cooling structure 220 includes a first flow channel 221 and a heat dissipation pipe 222 that are interconnected. The first flow channel 221 is provided on the shell wall of the shell 111, and the heat dissipation pipe 222 passes through the heat sink 230. It can be understood that by providing the first flow channel 221 in the shell wall of the shell 111, the first flow channel 221 can be prevented from being protruded from the side wall of the shell 111, thereby increasing the utilization rate of the space of the stator 110. Moreover, by passing the heat dissipation pipe 222 through the heat sink 230, the heat sink 230 increases the heat dissipation area, and can more efficiently reduce the temperature of the coolant in the heat dissipation pipe 222, thereby completing the cooling of the coolant. Of course, the present application is not limited to this. In some other embodiments, the liquid cooling structure 220 includes a heat exchange flow channel and a cooling pipe that are interconnected. The heat exchange flow channel is provided between the shell 111 and the stator 110 core, and the cooling pipe passes through the heat sink 230.

[0061] Furthermore, the first flow channel 221 is arranged in a spiral shape in the height direction of the side wall of the housing 111 , which can increase the heat exchange area of ​​the first flow channel 221 and thus increase the heat dissipation efficiency of the motor 100 .

[0062] Furthermore, the heat dissipation pipe 222 is spirally arranged in the height direction of the side wall of the housing 111 and passes through the heat dissipation fins 230 in sequence, which can increase the heat exchange area of ​​the first flow channel 221 and thus increase the heat dissipation efficiency of the motor 100.

[0063] Furthermore, the first liquid inlet 221 a 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 221 b of the first flow channel 221 is disposed on the inner wall surface of the housing 111 .

[0064] Furthermore, the heat dissipation liquid outlet 222 b of the heat dissipation tube 222 is arranged facing the end surface of the first end of the shell 111 , and the heat dissipation liquid inlet 222 a of the heat dissipation tube 222 is arranged on the inner wall surface of the shell 111 .

[0065] Furthermore, the heat dissipation liquid inlet 222a is arranged close to the end face of the first end of the shell 111. This is because when the motor 100 is running, the end face of the first end is in a lower position. The heat dissipation liquid inlet 222a is arranged close to the end face of the first end of the shell 111. In this way, the liquid can automatically flow downward by utilizing the principle of gravity and flow into the heat dissipation pipe 222.

[0066] Furthermore, there are multiple first liquid outlets 221b, and the multiple first liquid outlets 221b are arranged at intervals, which is beneficial to increasing the liquid output and improving the heat exchange efficiency.

[0067] Optionally, a heat exchange groove 223 is provided between the stator core 112 and the housing 111, and the first flow channel 221 is connected to the heat dissipation pipe 222 through the heat exchange groove 223. It can be understood that the heat exchange groove 223 is provided between the stator core 112 and the housing 111, and the coolant in the heat exchange groove 223 can directly contact the stator core 112, thereby removing the heat generated by the stator core 112 and the coil 113, preventing the heat from passing through the side wall of the housing 111 and then undergoing heat exchange, thereby reducing the heat exchange distance and increasing the heat dissipation efficiency of the motor 100. Of course, the present application is not limited to this. In other embodiments, the heat exchange groove 223 may not be provided, and the shell wall of the housing 111 may be directly used for heat exchange.

[0068] It should be noted that the stator core 112 is fixed to the outer shell 111, and the heat exchange groove 223 is provided on the outer wall of the stator core 112. The outer shell 111 covers the notch of the heat exchange groove 223. The heat exchange groove 223 is connected to the first flow channel 221 through the first liquid outlet 221b, and the heat exchange groove 223 is connected to the heat dissipation pipe 222 through the heat dissipation liquid inlet 222a. Of course, the present application is not limited to this. In the second embodiment, the heat exchange groove 223 can also be provided on the inner wall of the outer shell 111, and the stator core 112 covers the notch of the heat exchange groove 223. Of course, the present application is not limited to this. In the third embodiment, the outer wall of the stator core 112 and the inner wall of the outer shell 111 are both provided with heat dissipation grooves, and the two heat dissipation grooves cover each other's notches to form a heat dissipation channel between the stator core 112 and the outer shell 111.

[0069] Optionally, the liquid cooling structure 220 further includes a circulation pump 224, the liquid outlet of the circulation pump 224 is connected to the first flow channel 221, and the liquid inlet of the circulation pump 224 is connected to the heat pipe 222. It can be understood that the setting of the circulation pump 224 can allow the coolant in the heat pipe 222 to be cooled by the heat sink 230, and then enter the first flow channel 221 through the circulation pump 224 to continue heat exchange. Such a liquid cooling structure 220 does not require an external environmental control system, reduces the parts of the system, and thus reduces the weight of the motor 100. Of course, the present application is not limited to this. In some other embodiments, the liquid cooling structure 220 may also include an external cooling pipe, which guides the coolant into the first flow channel 221 and guides out the high-temperature coolant after heat exchange in the heat pipe 222.

[0070] It should be noted that when the motor 100 is used in an electric propulsion system, the liquid cooling structure is integrated into the stator of the motor, which can reduce the weight of the electric propulsion system and contribute to lightweight design; and the space utilization rate is increased, effectively improving the electric propulsion power density.

[0071] 11 and 12 , the stator 110 optionally further comprises a housing cover 115 covering the opening of the outer shell 111 , the housing cover 115 being provided with a second flow channel, the outlet of the circulating pump 224 being connected to the first flow channel 221 via the second flow channel; it is understood that the provision of the housing cover 115 facilitates forming a protective cavity within the outer shell 111 , the protective cavity being used to install components such as the stator core 112 , the inner shell 114 , and the rotor 120 , thereby preventing the rotor 120 from being exposed to the environment and increasing the safety of the operation of the motor 100 , and the provision of the second flow channel in the housing cover 115 can avoid the need for a connecting pipe between the circulating pump 224 and the first flow channel 221 , making the structure of the motor 100 more compact and conducive to reducing the volume; furthermore, the provision of the second flow channel can increase the contact area between the coolant and the housing cover 115 , thereby increasing the heat dissipation efficiency of the housing cover 115 . Of course, the present application is not limited thereto. In other embodiments, an external connecting pipe can also be provided, and the connecting pipe can be used to connect the circulating pump 224 and the first flow channel 221 .

[0072] Furthermore, the second liquid outlet 225b of the second flow channel is provided on the shell cover 115 and is provided corresponding to the first liquid inlet 221a. The first liquid inlet 221a and the second liquid outlet 225b are sealed and connected. The second liquid inlet 225a of the second flow channel is provided on the shell cover 115.

[0073] 10 , optionally, the inner shell 114 is provided with a third flow channel 226 , and the liquid outlet of the circulation pump 224 is connected to the second flow channel through the third flow channel 226 ; it can be understood that the inner shell 114 is closer to the rotor 120 , and providing the third flow channel 226 in the inner shell 114 is beneficial for the third flow channel 226 to promptly remove the heat generated by the rotor 120 , thereby increasing the heat dissipation efficiency; of course, the present application is not limited to this, and in some other embodiments, the third flow channel 226 may not be provided on the inner shell 114 , and the heat exchange groove 223 may be directly used to dissipate heat from the rotor 120 .

[0074] Furthermore, the third liquid inlet 226a of the third flow channel 226 is provided on the bottom plate of the inner shell 114, and the third liquid outlet 226b of the third flow channel 226 is provided on the bottom plate of the inner shell 114 and is provided corresponding to the second liquid inlet 225a, and the third liquid outlet 226b is sealedly connected to the second liquid inlet 225a.

[0075] Optionally, the housing cover 115 is provided with a liquid port 227, and the liquid outlet of the circulation pump 224 is connected to the third flow channel 226 through the liquid port 227; it can be understood that the liquid outlet of the circulation pump 224 and the third flow channel 226 provided on the inner housing 114 are spaced apart, with the housing cover 115 provided therebetween, and the liquid port 227 is provided on the housing cover 115, and the circulation pump 224 and the third flow channel 226 are connected by the liquid port 227, making the structure of the motor 100 more compact and conducive to reducing the volume. Of course, the present application is not limited to this. In other embodiments, an external connecting pipe can also be provided, and the connecting pipe can be used to connect the circulation pump 224 and the third flow channel 226.

[0076] It should be noted that the liquid passage port 227 is provided corresponding to the third liquid inlet 226 a and is sealedly connected to the third liquid inlet 226 a.

[0077] Optionally, the housing cover 115 further includes a fourth flow channel, through which the heat dissipation pipe 222 communicates with the liquid inlet of the circulation pump 224. Providing the fourth flow channel in the housing cover 115 avoids the need for a connecting pipe between the circulation pump 224 and the heat dissipation pipe 222, thereby making the structure of the motor 100 more compact and reducing its size. Of course, the present application is not limited thereto. In other embodiments, an external connecting pipe may be provided to connect the circulation pump 224 and the heat dissipation pipe 222.

[0078] Furthermore, the fourth liquid inlet 228a of the fourth flow channel is arranged on the outer ring surface of the shell cover 115 and is arranged corresponding to the heat dissipation liquid outlet 222b. The fourth liquid inlet 228a is sealedly connected to the heat dissipation liquid outlet 222b. The fourth liquid outlet 228b of the fourth flow channel is arranged on the shell cover 115 and is sealedly connected to the liquid inlet of the circulation pump 224.

[0079] It should be noted that the circulation pump 224 is fixed to the housing 111 so as to be connected to the motor 100 as a whole.

[0080] Optionally, the air-cooling structure 210 includes a first air-cooling channel 211 provided on the rotor 120, and an air inlet 211a and an air outlet 211b provided at both ends of the outer shell 111, the air inlet 211a and the air outlet 211b being respectively connected to the first air-cooling channel 211; it can be understood that providing the first air-cooling channel 211 on the rotor 120 is conducive to increasing the cooling air flow rate and flow rate of the rotor 120, thereby facilitating an increase in the heat dissipation efficiency of the heat generated during operation of the rotor 120. Of course, the present application is not limited to this. In other embodiments, the air-cooling structure 210 may also include a heat dissipation channel provided on the shell wall of the inner shell 114, the heat dissipation channel penetrating the shell wall of the inner shell 114 along the width direction of the side shell wall of the inner shell 114.

[0081] Optionally, the rotor 120 includes a rotor core 122 and a plurality of magnets 123. The rotor core 122 is provided with a groove corresponding to each magnet 123. The magnet 123 is disposed within the groove, and the first air cooling channel 211 is disposed between the magnet 123 and the sidewall of the groove. Such a first air cooling channel 211 has a simple structure and is easy to process, thereby reducing processing costs. Of course, the present application is not limited to this. In other embodiments, the first air cooling channel 211 may also be a heat dissipation channel separately excavated on the rotor core of the rotor 120.

[0082] Furthermore, the air inlet 211 a is provided on the upper wall of the outer shell 111 , and the air outlet 211 b is provided on the shell cover 115 .

[0083] Optionally, the air-cooling structure 210 includes a second air-cooling channel 212 , and the second air-cooling channel 212 is formed between any two heat sinks 230 . It can be understood that forming the second air-cooling channel 212 between any two heat sinks 230 is beneficial to increasing heat dissipation efficiency.

[0084] Optionally, the motor 100 further includes a rear cover 130, which is connected to the housing 111 and disposed near the air outlet 211b. The first vent 213 of the rear cover 130 communicates with the air outlet 211b and the second air cooling channel 212. Of course, the present application is not limited thereto, and in other embodiments, the rear cover 130 may not be provided.

[0085] It should be noted that when the motor 100 is running, a portion of the external cool air flows into the first air cooling passage 211 of the housing 111, exchanges heat with the stator 110 and rotor 120 within the motor 100, then flows through the air outlet 211b of the housing cover 115 and into the rear cover 130. The air then flows out 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 vent 213 of the rear cover 130.

[0086] Optionally, the rear cover 130 is provided with a plurality of cooling fans 214. It is understood that the provision of the cooling fans 214 is conducive to accelerating the flow rate and flow of the cooling air, thereby improving the heat dissipation efficiency. Of course, the present application is not limited thereto, and in other embodiments, the cooling fans 214 may not be provided.

[0087] Optionally, the stator 110 further includes a sealing ring 116 , which covers the stator core 112 . It is understood that the sealing ring 116 seals the coil 113 to prevent coolant from overflowing.

[0088] 1 to 3 , the present application also proposes a propulsion system, which includes a controller 500 and a motor 100. The controller 500 is connected to the bottom plate of the inner shell 114 of the motor 100. It can be understood that fixing the controller 500 and the motor 100 as one can reduce the parts of the propulsion system, greatly improving the overall durability of the propulsion system, improving the NVH performance of the system, and improving the anti-interference ability.

[0089] Furthermore, the controller 500 is connected to the inner shell 114 of the motor 100 , and a third flow channel 226 is provided on the bottom plate of the inner shell 114 . The third flow channel 226 can take away the heat of the controller 500 , thereby preventing the controller 500 from overheating and burning.

[0090] Optionally, the controller 500 is composed of a power module, a control module, a drive module, etc.

[0091] Furthermore, the power module of the controller 500 is assembled on the surface of the base plate. It can be understood that the power module of the controller 500 is the main heat-generating structure. Since a third flow channel 226 is provided on the base plate of the inner shell 114, the heat generated by the power module can be taken away in time, which is conducive to improving the heat dissipation efficiency.

[0092] It should be noted that when the propulsion system is working, the controller 500 receives the DC power transmitted from the battery, and inverts the DC power into three-phase AC power through the power module in the controller 500 to provide power to the coil 113 of the motor 100. At the same time, the heat generated by the controller 500 during the inversion process is heat exchanged with the coolant in the third flow channel 226 through the bottom plate of the heat transfer inner shell 114, thereby reducing the temperature of the controller 500.

[0093] Optionally, the controller 500 includes a plurality of independent power modules, and the stator 110 of the motor 100 is provided with a coil 113 corresponding to one power module.

[0094] Furthermore, the electrical architecture of the propulsion system is that the stator 110 of the motor 100 is independently composed of two groups of coils 113 to form a dual-winding structure, and the power module of the controller 500 is composed of two groups of independent modules. The two groups of independent modules respectively provide electrical energy to the two groups of coils 113 of the stator 110 of the motor 100, thereby increasing the safety margin of the electric propulsion system.

[0095] Optionally, the propulsion system also includes a propeller mechanism 300 and a fairing 400, the hub 310 of the propeller mechanism 300 and the fairing 400 are connected to the rotor 120 of the motor 100, and a second ventilation port 215 is formed between the fairing 400 and the hub 310, and the second ventilation port 215 is respectively connected to the air inlet 211a of the motor 100 and the second air cooling channel 212 of the motor 100.

[0096] It should be noted that the coils 113 of the motor 100 receive electrical energy, which, through the electromagnetic induction principle of the rotor 120 magnets 123, drives the rotor 120 to rotate. This in turn drives the propeller 320 mechanism 300 to rotate via the rotor bracket 121, thereby generating power. Simultaneously, heat is generated during the operation of the stator 110 and rotor 120. The air-cooling structure 210 and the liquid-cooling structure 220 can promptly remove this heat from the stator 110 and rotor 120 during operation, thereby preventing the motor 100 from overheating and burning.

[0097] It should be noted that the propeller mechanism 300 can adopt a variable-pitch propeller 320, a fixed-pitch propeller 320, etc. according to different operating conditions.

[0098] It should be noted that the propeller mechanism 300 includes a hub 310, a propeller 320, and a fairing 330. The hub 310 can be equipped with various accessories to achieve fixed or variable pitch settings for the propeller 320, depending on the operating conditions. The propeller mechanism 300 is connected to the rotor support 121 via connectors at the bottom of the hub 310. The fairing 400 is coaxially assembled with the hub 310 and attached to the rotor support 121. A second vent 215 is formed between the fairing 400 and the hub 310 of the propeller 320.

[0099] Furthermore, when the propulsion system is operating, the cooling process of the air-cooling structure 210 is as follows: First, a portion of the external cold air enters the propulsion system through the second vent 215 formed between the shroud 400 and the hub 310 of the propeller 320. Then, a portion of the external cold air flows into the first air-cooling channel 211 of the housing 111. After heat exchange with the stator 110 and rotor 120 inside the motor 100, it flows through the air outlet 211b of the housing 115 and enters the rear cover 130, and then flows out through the first vent 213 of the rear cover 130. Another portion of the external cold air enters the rear cover 130 through the second air-cooling channel 212 and finally flows out through the first vent 213 of the rear cover 130, thereby cooling the heat generated during the operation of the motor 100.

[0100] Furthermore, when the propulsion system is running, the cooling process of the liquid cooling structure 220 is as follows: first, the coolant flows from the liquid outlet of the circulation pump 224 into the liquid outlet 227 of the shell cover 115, and then flows into the third flow channel 226 through the liquid outlet 227 and into the inner shell 114. At the same time, when the coolant flows in the third flow channel 226, it exchanges heat with the heat generated by the controller 500 through the bottom plate, removes the heat from the controller 500, and achieves the purpose of reducing the temperature of the controller 500. Then, the coolant flows into the second flow channel of the shell cover 115. Then it flows through the first flow channel 221 and flows into the heat exchange groove 223. At the same time, the coolant exchanges heat with the stator core 112 and the coil 113 when flowing in the heat exchange groove 223, and takes out the heat generated when the motor 100 is running; then, the coolant that has undergone heat exchange enters the heat dissipation pipe 222, exchanges heat with the external cooling air, so that the temperature of the coolant in the heat dissipation pipe 222 is reduced, and the cooled coolant flows into the fourth flow channel of the shell cover 115, and finally returns to the liquid inlet of the circulation pump 224, thereby completing the cooling of the coolant.

[0101] The present application also proposes an aircraft, which includes a propulsion system. The specific structure of the propulsion system refers to the above-mentioned embodiments. Since the present aircraft adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0102] The above are merely optional embodiments of the present application and do not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A motor, wherein: include: a stator, the stator comprising a housing; A rotor, one end of which is rotatably connected to the housing via a first bearing; as well as A 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.

2. The motor according to claim 1, wherein: The cooling system includes a plurality of heat sinks, and the plurality of heat sinks are arranged at intervals on the outer wall surface of the housing.

3. The motor according to claim 2, wherein: The liquid cooling structure comprises a first flow channel and a heat dissipation pipe which are interconnected, wherein the first flow channel is arranged on the shell wall of the shell, and the heat dissipation pipe passes through the heat sink.

4. The motor according to claim 3, wherein: The stator further includes a stator core, which is disposed on the inner side wall of the shell. A heat exchange groove is disposed between the stator core and the shell, and the first flow channel is connected to the heat dissipation pipe through the heat exchange groove.

5. The motor according to claim 4, wherein: The stator further comprises a sealing ring, and the sealing ring covers the stator core.

6. The electric machine according to claim 3, wherein: The liquid cooling structure further includes 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 heat dissipation pipe.

7. The electric machine according to claim 6, wherein: 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 circulation pump is connected with the first flow channel through the second flow channel.

8. The electric machine according to claim 7, wherein: The stator further comprises an inner shell, the inner shell is fixed to the outer shell, and the other end of the rotor is rotatably connected to the inner shell via a second bearing.

9. The electric machine according to claim 8, wherein: The inner shell is provided with a third flow channel, and the liquid outlet of the circulation pump is communicated with the second flow channel through the third flow channel.

10. The electric machine according to claim 9, wherein: The shell cover is provided with a liquid outlet, and the liquid outlet of the circulation pump is communicated with the third flow channel through the liquid outlet.

11. The electric machine according to claim 7, wherein: The shell cover is also provided with a fourth flow channel, and the heat dissipation pipe is communicated with the liquid inlet of the circulation pump through the fourth flow channel.

12. The electric machine according to claim 3, wherein: The first flow channel is arranged in a spiral shape in the height direction of the shell.

13. The electric machine according to claim 3, wherein: The heat dissipation pipe is arranged in a spiral shape in the height direction of the shell.

14. The electric machine according to claim 2, wherein: The air cooling structure includes a first air cooling channel arranged on the rotor, and an air inlet and an air outlet arranged on both ends of the shell, and the air inlet and the air outlet are respectively connected to the first air cooling channel.

15. The electric machine according to claim 14, wherein: The rotor includes a rotor core and a plurality of magnetic steels. The rotor core is provided with a groove corresponding to each of the magnetic steels. The magnetic steels are arranged in the grooves. The first air cooling channel is arranged between the magnetic steels and the side walls of the grooves.

16. The electric machine according to claim 15, wherein: The air cooling structure includes a second air cooling channel, and the second air cooling channel is formed between any two of the heat sinks.

17. The electric machine according to claim 16, wherein: The motor further comprises a rear cover, which is connected to the housing and arranged close to the air outlet, and a first ventilating opening of the rear cover is in communication with the air outlet and the second air cooling channel.

18. The electric machine according to claim 17, wherein: The rear cover is provided with a plurality of heat dissipation fans.

19. The electric machine according to claim 2, wherein: The stator further comprises a protection ring, the inner side wall of which is connected to a side of the heat sink away from the housing, so as to form a heat dissipation channel between any two heat sinks.

20. The electric machine according to any one of claims 1 to 19, wherein: The rotor comprises a rotor support and a rotor core, and the outer side wall of the rotor support and the inner side wall of the rotor core are assembled into one body in an interference fit manner.

21. A propulsion system, wherein: The invention comprises a controller and a motor as claimed in any one of claims 1 to 20, wherein the controller is connected to a bottom plate of an inner shell of the motor.

22. The propulsion system of claim 21, wherein: The controller includes a plurality of independent power modules, and the stator of the motor is provided with a coil corresponding to a power module.

23. The propulsion system of claim 22, wherein: The propulsion system also includes a propeller mechanism and a fairing, the hub of the propeller mechanism and the fairing are connected to the rotor of the motor, and a second vent is formed between the fairing and the hub, and the second vent is respectively connected to the air inlet of the motor and the second air cooling channel of the motor.

24. An aircraft, wherein: Comprising a propulsion system as claimed in any one of claims 21 to 23.

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