Outer rotor liquid cooling motor and aircraft

Abstract

The invention provides an outer rotor liquid cooling motor and an aircraft. The outer rotor liquid cooling motor comprises a power module, a first heat dissipation module and a second heat dissipation module. The outer rotor liquid cooling motor is provided with a first channel and a second channel, the suction pump is used for sucking cooling liquid, the cooling liquid flows to the stator and the first channel through the liquid guide pipe, and the cooling liquid is used for absorbing heat of the stator; the air outlet communicates with the second channel and is used for forming cooling airflow, and the cooling airflow sequentially flows through the converter, the second channel and the air outlet and is used for cooling the cooling liquid. The first heat dissipation module and the second heat dissipation module are arranged in the outer rotor liquid cooling motor, a cooling liquid circulation system and a cooling gas circulation system are formed, the stator is cooled through cooling liquid, the cooling liquid is cooled through cooling air flow, meanwhile, the cooling air flow can further penetrate through the interior of the outer rotor liquid cooling motor, and the cooling effect is improved. Heat energy in the outer rotor liquid cooling motor is taken away, and the heat dissipation efficiency of the outer rotor liquid cooling motor is improved.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and specifically relates to an outer rotor liquid-cooled motor and an aircraft. Background Art

[0002] In the field of motors, outer rotor brushless motors are often used as driving components of aircraft. Outer rotor brushless motors have the advantages of small size and high power. At the same time, during operation, the heat generated by the outer rotor brushless motor is also very large, resulting in the outer rotor brushless motor often needing to rely on external heat dissipation mechanisms for heat dissipation. For example, related technologies often set a fan on the outside to cool the motor from the outside. However, the external heat dissipation mechanism has a poor heat dissipation effect on the motor, resulting in a high risk of overheating and burning of the motor. Summary of the invention

[0003] In view of this, the first aspect of the present application provides an outer rotor liquid-cooled motor, the outer rotor liquid-cooled motor comprising: A power module, comprising a rotating shaft, a rotor, and a stator, wherein the rotor is sleeved on the rotating shaft, the rotating shaft is used to drive the rotor to rotate, the stator is arranged around the circumferential direction of the rotating shaft, the outer rotor liquid-cooled motor has a first channel and a second channel, the stator is arranged in the first channel, and the second channel is arranged between the stator and the rotating shaft; a first heat dissipation module, comprising a suction pump, a liquid guide tube, and a converter, wherein the liquid guide tube connects the suction pump and one end of the first channel, the converter connects the other end of the first channel and the suction pump, the suction pump is used to suck cooling liquid, the cooling liquid flows to the stator and the first channel through the liquid guide tube, the cooling liquid in the first channel flows to the suction pump through the converter, and the cooling liquid is used to absorb heat from the stator; and The second heat dissipation module includes an exhaust port arranged on the rotor, the exhaust port is connected to the second channel, the converter is arranged at one end of the second channel away from the exhaust port, the exhaust port is used to form a cooling airflow, the cooling airflow flows through the converter, the second channel, and the exhaust port in sequence, and the cooling airflow is used to cool the coolant located in the converter.

[0004] Among them, the power module also includes a magnetic part and a bracket, the magnetic part is arranged around the circumferential direction of the rotating shaft and is sleeved on the stator, the magnetic part is connected to the rotor, the bracket is arranged between the rotating shaft and the stator, the first channel is formed between the bracket, the rotor, and the magnetic part, the bracket forms the second channel, and the second channel is arranged between the stator and the rotating shaft.

[0005] The outer peripheral side wall of the bracket is provided with a liquid collecting groove, the liquid collecting groove is connected to the first channel, and the stator and the opening of the liquid collecting groove are arranged correspondingly, and the liquid collecting groove is used to collect the cooling liquid from the stator and the first channel.

[0006] Among them, the converter is arranged on the inner side of the bracket, and the bracket has a first connecting flow channel that penetrates the wall of the liquid collecting tank and the inner side wall of the bracket. The first connecting flow channel connects the converter and the liquid collecting tank, and the coolant in the liquid collecting tank flows to the converter through the first connecting flow channel.

[0007] Wherein, the suction pump is arranged at the end of the rotating shaft away from the rotor, and the rotating shaft is also used to drive the suction pump to suck the coolant, and the converter is arranged between the bracket and the suction pump; the converter has a second connecting flow channel that runs through the outer peripheral side wall of the converter and the inner peripheral side wall of the converter, and the second connecting flow channel connects the first connecting flow channel and the suction pump, and the coolant in the converter flows to the suction pump through the second connecting flow channel.

[0008] The converter has a through hole, which passes through the converter along the axial direction of the rotating shaft, and is connected to the second channel. At least part of the through hole is arranged adjacent to the second connecting flow channel, and the cooling air flow passes through the converter through the through hole and flows to the second channel.

[0009] Wherein, the second heat dissipation module also includes an isolating member, which is arranged on the surface of the rotor facing the stator, and the isolating member is convexly provided with an isolating portion, which is arranged at the connection between the first channel and the second channel, and the isolating portion is extended in a direction close to the bracket.

[0010] Among them, the liquid guide tube includes a first ring portion, a second ring portion, and a connecting portion, the first ring portion is sleeved on the second ring portion, the connecting portion connects the first ring portion and the second ring portion, the first ring portion is located in the first channel, and the first ring portion has a plurality of through holes arranged at intervals along the circumferential direction of the rotating shaft, the second ring portion is connected to the suction pump, and the coolant flows to the stator and the first channel in sequence through the second ring portion, the connecting portion, the first ring portion, and the through holes.

[0011] There are multiple exhaust ports, which are spaced apart on the circumferential side of the rotor along the circumferential direction of the rotor. The rotating shaft is used to drive the rotor to rotate, thereby driving the multiple exhaust ports to rotate to form the cooling airflow.

[0012] A second aspect of the present application provides an aircraft, which includes a shell, and an outer rotor liquid-cooled motor as provided in the first aspect of the present application, wherein the outer rotor liquid-cooled motor is installed in the shell.

[0013] The outer rotor liquid-cooled motor and aircraft provided in the present application form a coolant circulation system and a cooling gas circulation system by arranging a first heat dissipation module and a second heat dissipation module inside the outer rotor liquid-cooled motor. Not only does the coolant effectively cool the stator, greatly improving the heat dissipation efficiency of the outer rotor liquid-cooled motor and improving the operating power and reliability of the outer rotor liquid-cooled motor, but the coolant is also cooled by the cooling airflow to realize the internal circulation of the coolant in the outer rotor liquid-cooled motor. At the same time, the cooling airflow can also pass through the interior of the outer rotor liquid-cooled motor, further taking away the heat energy inside the outer rotor liquid-cooled motor, cooling other components in the outer rotor liquid-cooled motor, further improving the heat dissipation efficiency of the outer rotor liquid-cooled motor, and further improving the operating power and reliability of the outer rotor liquid-cooled motor.

[0014] Furthermore, the present application integrates the heat dissipation module inside the outer rotor liquid-cooled motor, so that the outer rotor liquid-cooled motor has a compact structure, and has the advantages of small size and low weight, and is particularly suitable for the application of unmanned aerial vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the implementation modes of the present application will be described below.

[0016] Figure 1 A schematic diagram of the structure of an outer rotor liquid-cooled motor provided in one embodiment of the present application.

[0017] Figure 2 This is an exploded view of the structure of an outer rotor liquid-cooled motor provided in one embodiment of the present application.

[0018] Figure 3 A schematic cross-sectional view of an outer rotor liquid-cooled motor provided in one embodiment of the present application.

[0019] Figure 4 A schematic diagram of the path of the coolant in the outer rotor liquid-cooled motor provided in one embodiment of the present application.

[0020] Figure 5 A schematic cross-sectional view of an outer rotor liquid-cooled motor provided in one embodiment of the present application from another perspective.

[0021] Figure 6 A schematic diagram of the path of cooling airflow in an outer rotor liquid-cooled motor provided in one embodiment of the present application.

[0022] Figure 7 A schematic diagram of the structure of a bracket provided in one embodiment of the present application.

[0023] Figure 8 A schematic diagram of the structure of a converter provided in one embodiment of the present application.

[0024] Fig. 9 A schematic structural diagram of a converter provided in another embodiment of the present application.

[0025] Fig.10 A schematic diagram of the structure of a liquid catheter provided in one embodiment of the present application.

[0026] Explanation of reference numerals: outer rotor liquid-cooled motor 1, first channel 1a, second channel 1b, power module 10, rotating shaft 11, rotor 12, stator 13, magnetic member 14, bracket 15, liquid collecting tank 151, first connecting channel 152, engaging groove 153, bearing 16, locking ring 17, buffer member 18, first heat dissipation module 20, suction pump 21, liquid guide tube 22, first ring portion 221, through hole 2211, second ring portion 222, connecting portion 223, converter 23, second connecting channel 231, through hole 232, sealing member 24, second heat dissipation module 30, exhaust port 31, isolation member 32. DETAILED DESCRIPTION

[0027] The following are preferred implementations of the present application. It should be noted that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications are also considered to be within the scope of protection of the present application.

[0028] Please refer to Figure 1-Figure 6 The present embodiment provides an outer rotor liquid-cooled motor 1, which includes a power module 10, a first heat dissipation module 20, and a second heat dissipation module 30. The power module 10 includes a rotating shaft 11, a rotor 12, and a stator 13. The rotor 12 is sleeved on the rotating shaft 11, and the rotating shaft 11 is used to drive the rotor 12 to rotate. The stator 13 is arranged around the circumferential direction of the rotating shaft 11. The outer rotor liquid-cooled motor 1 has a first channel 1a and a second channel 1b. The stator 13 is arranged in the first channel 1a, and the second channel 1b is arranged between the stator 13 and the rotating shaft 11.

[0029] The first heat dissipation module 20 includes a suction pump 21, a liquid guide tube 22, and a converter 23. The liquid guide tube 22 connects the suction pump 21 with one end of the first channel 1a, and the converter 23 connects the other end of the first channel 1a with the suction pump 21. The suction pump 21 is used to suck cooling liquid, and the cooling liquid flows to the stator 13 and the first channel 1a through the liquid guide tube 22. The cooling liquid in the first channel 1a flows to the suction pump 21 through the converter 23, and the cooling liquid is used to absorb the heat of the stator 13.

[0030] The second heat dissipation module 30 includes an exhaust port 31 disposed on the rotor 12, the exhaust port 31 is connected to the second channel 1b, the converter 23 is disposed at one end of the second channel 1b away from the exhaust port 31, the exhaust port 31 is used to form a cooling airflow, and the cooling airflow flows through the converter 23, the second channel 1b, and the exhaust port 31 in sequence, and the cooling airflow is used to cool the coolant located in the converter 23.

[0031] The outer rotor liquid-cooled motor 1 provided in this embodiment can be applied to the fields of aircraft, manufacturing, home appliances, and construction, etc., and this embodiment does not limit this. The outer rotor liquid-cooled motor 1 can be connected to a transmission structure as a driving unit of the transmission structure to drive the transmission structure to operate.

[0032] Among them, the power module 10 includes a rotating shaft 11, a rotor 12, and a stator 13. The rotor 12 and the stator 13 are arranged at intervals along the axial direction of the rotating shaft 11, and the rotor 12 abuts and is connected to the rotating shaft 11. For example, the rotor 12 is threadedly connected to the rotating shaft 11, and the stator 13 is arranged at intervals from the rotating shaft 11. The rotating shaft 11 is transmission-connected to the rotor 12, and the rotating shaft 11 can drive the rotor 12 to rotate. The rotor 12 is the rotating part of the outer rotor liquid-cooled motor 1, and the rotating magnetic field in the rotor 12 and the stator 13 interact to generate mechanical energy. The stator 13 is the fixed part of the outer rotor liquid-cooled motor 1, usually composed of a metal frame and a plurality of coils. The stator 13 includes an iron core and a coil. The iron core is usually made of laminated silicon steel sheets to reduce eddy current losses. The coil is a wire wound in the iron core slot to generate a rotating magnetic field.

[0033] The outer rotor liquid-cooled motor 1 has a first channel 1a and a second channel 1b, wherein the first channel 1a is used to accommodate the stator 13, the first channel 1a is extended along the axial direction of the rotating shaft 11, and the second channel 1b is extended along the axial direction of the rotating shaft 11, the first channel 1a and the second channel 1b are arranged adjacent to each other, and the second channel 1b is closer to the rotating shaft 11 than the first channel 1a. Optionally, the first channel 1a is connected to the second channel 1b, or the first channel 1a and the second channel 1b are arranged independently. The first channel 1a and the second channel 1b can be formed by a plurality of components, or can be formed by the cavity of one component.

[0034] The first heat dissipation module 20 includes a suction pump 21, a liquid guide tube 22, and a converter 23. The suction pump 21 is located between the liquid guide tube 22 and the converter 23, and the liquid guide tube 22 and the converter 23 are respectively located at opposite ends of the first channel 1a. The suction pump 21 is used to suck the coolant, the liquid guide tube 22 is used to guide the coolant to flow to the stator 13, and the converter 23 is used to cool down the coolant that absorbs heat. Figure 4 As shown, the coolant flows from top to bottom on the stator 13, and is then re-sucked by the suction pump 21 to form a cycle. Specifically, the suction pump 21 sucks the coolant that has been cooled by the converter 23 to the liquid guide tube 22; the coolant flows to the stator 13 through the liquid guide tube 22, and the coolant absorbs the heat of the stator 13 to cool the stator 13; the coolant that has absorbed the heat flows to the converter 23 through the first channel 1a; the converter 23 cools the coolant that has absorbed the heat again, and then the coolant in the converter 23 is sucked away by the suction pump 21, and the above steps are repeated to form a coolant circulation system. The path of the coolant in the outer rotor liquid-cooled motor 1 is shown in the figure. Figure 4 As shown in P1.

[0035] Optionally, the suction pump 21 is disposed at the end of the rotating shaft 11 away from the rotor 12, and the rotating shaft 11 is also used to drive the suction pump 21 to suck the coolant, and the central axis of the suction pump 21 coincides with the central axis of the rotating shaft 11. This arrangement is conducive to integrating the heat dissipation module into the outer rotor liquid-cooled motor 1, so that the outer rotor liquid-cooled motor 1 has a compact structure and has the advantages of small size and low weight.

[0036] The second heat dissipation module 30 includes an exhaust port 31 disposed on the rotor 12. The rotating shaft 11 can drive the rotor 12 to rotate, thereby driving the exhaust port 31 to rotate to form a cooling airflow. Specifically, under the action of the exhaust port 31, the external air passes through the converter 23, the second channel 1b, and the exhaust port 31 in sequence to form a cooling airflow. Figure 6As shown, the cooling airflow passes through the outer rotor liquid-cooled motor 1 from bottom to top and forms a cycle with the external air. The cooling airflow with a lower temperature exchanges heat with the coolant that absorbs heat on the converter 23 to achieve cooling of the coolant by the cooling airflow, and the cooling airflow with a lower temperature passes through the second channel 1b inside the outer rotor liquid-cooled motor 1, and can also take away the heat inside the outer rotor liquid-cooled motor 1 to cool the inside of the outer rotor liquid-cooled motor 1; the cooling airflow after absorbing heat is discharged to the outside again through the exhaust port 31, and the above steps are repeated to form a cooling gas circulation system. The path of the cooling airflow in the outer rotor liquid-cooled motor 1 is shown as follows. Figure 6 As shown in P2.

[0037] In summary, the outer rotor liquid-cooled motor 1 provided in the present embodiment forms a coolant circulation system and a cooling gas circulation system by arranging a first heat dissipation module 20 and a second heat dissipation module 30 inside the outer rotor liquid-cooled motor 1. The coolant is not only used to effectively cool the stator 13, which greatly improves the heat dissipation efficiency of the outer rotor liquid-cooled motor 1, and improves the operating power and reliability of the outer rotor liquid-cooled motor 1, but also uses the cooling airflow to cool the coolant to realize the internal circulation of the coolant in the outer rotor liquid-cooled motor 1. At the same time, the cooling airflow can also pass through the inner part of the outer rotor liquid-cooled motor 1, further take away the heat energy inside the outer rotor liquid-cooled motor 1, and cool down other components in the outer rotor liquid-cooled motor 1, thereby further improving the heat dissipation efficiency of the outer rotor liquid-cooled motor 1, and further improving the operating power and reliability of the outer rotor liquid-cooled motor 1.

[0038] Furthermore, in this embodiment, the heat dissipation module is integrated into the outer rotor liquid-cooled motor 1, so that the outer rotor liquid-cooled motor 1 has a compact structure, small size and low weight, and is particularly suitable for the application of unmanned aerial vehicles.

[0039] Please refer to Figure 1-Figure 7 In one embodiment, the power module 10 further includes a magnetic member 14 and a bracket 15, wherein the magnetic member 14 is arranged around the circumferential direction of the rotating shaft 11 and is sleeved on the stator 13, the magnetic member 14 is connected to the rotor 12, the bracket 15 is arranged between the rotating shaft 11 and the stator 13, the bracket 15, the rotor 12, and the magnetic member 14 surround and form the first channel 1a, the bracket 15 forms the second channel 1b, and the second channel 1b is arranged between the stator 13 and the rotating shaft 11.

[0040] The material of the magnetic member 14 can be rare earth magnet steel, such as neodymium iron boron, or other types of permanent magnetic materials. The magnetic member 14 is used to generate a magnetic field, which interacts with the current in the outer rotor liquid-cooled motor 1 to generate force and motion. The end of the magnetic member 14 abuts the rotor 12. Optionally, the rotor 12 is provided with an annular groove, and part of the magnetic member 14 is arranged in the buffer. The rotating shaft 11 can drive the rotor 12 to rotate, thereby driving the magnetic member 14 to rotate.

[0041] The bracket 15 is used to fix other components. The bracket 15 is sleeved on the rotating shaft 11, and the bracket 15 is spaced apart from the rotating shaft 11. Optionally, a bearing 16 is further provided between the rotating shaft 11 and the bracket 15. The stator 13 is fixed to the outer peripheral side of the bracket 15. Optionally, the connection between the stator 13 and the bracket 15 can be a clamping connection, a threaded connection, an adhesive connection, etc., which is not limited in this embodiment.

[0042] The first channel 1a is formed by a plurality of components, and is formed by the outer peripheral side wall of the bracket 15, the surface of the rotor 12 facing the stator 13, and the inner peripheral side wall of the magnetic member 14, and the stator 13 is entirely disposed in the first channel 1a. When the coolant flows through the first channel 1a, the coolant is also used to absorb the heat of the magnetic member 14, further improving the heat dissipation efficiency of the outer rotor liquid-cooled motor 1, and further improving the operating power and reliability of the outer rotor liquid-cooled motor 1.

[0043] The second channel 1b is formed by the cavity of the bracket 15, and the cavity penetrates the surface of the bracket 15 facing the rotor 12 and the surface of the bracket 15 away from the rotor 12, and the cavity penetrates the bracket 15 along the axial direction of the rotating shaft 11. In other words, the bracket 15 is a hollow structure. When the cooling airflow flows through the second channel 1b, the cooling airflow is also used to cool the bracket 15, thereby indirectly cooling the rotating shaft 11 and the stator 13, further improving the heat dissipation efficiency of the outer rotor liquid-cooled motor 1, and further improving the operating power and reliability of the outer rotor liquid-cooled motor 1.

[0044] In summary, this embodiment limits the positions of the first channel 1a and the second channel 1b so that the coolant can also absorb the heat of the magnetic component 14, and the cooling airflow can also cool the bracket 15, thereby cooling the rotating shaft 11 and the stator 13 in the outer rotor liquid-cooled motor 1, thereby further improving the heat dissipation efficiency of the outer rotor liquid-cooled motor 1, and further improving the operating power and reliability of the outer rotor liquid-cooled motor 1.

[0045] Please refer to Figure 1-Figure 7 In one embodiment, a liquid collecting groove 151 is provided on the outer peripheral side wall of the bracket 15, and the liquid collecting groove 151 is connected to the first channel 1a, and the stator 13 is arranged corresponding to the opening of the liquid collecting groove 151, and the liquid collecting groove 151 is used to collect the coolant from the stator 13 and the first channel 1a.

[0046] The outer peripheral side wall of the bracket 15 away from the rotor 12 is provided with a liquid collecting groove 151, which is arranged around the circumferential direction of the rotating shaft 11, and the liquid collecting groove 151 is located below the stator 13. Optionally, the magnetic member 14 is spaced apart from the bracket 15; further, the magnetic member 14 is spaced apart from the groove wall of the liquid collecting groove 151. Optionally, a buffer member 18 is provided between the magnetic member 14 and the bracket 15 to reduce the friction between the magnetic member 14 and the bracket 15.

[0047] In summary, this embodiment arranges a liquid collecting tank 151 on the bracket 15 to collect the coolant, thereby improving the circulation efficiency of the coolant, thereby improving the heat dissipation efficiency of the outer rotor liquid-cooled motor 1, and improving the operating power and reliability of the outer rotor liquid-cooled motor 1.

[0048] Please refer to Figure 1-Figure 7 In one embodiment, the converter 23 is arranged on the inner side of the bracket 15, and the bracket 15 has a first connecting flow channel 152 that penetrates the groove wall of the collecting groove 151 and the inner side wall of the bracket 15, and the first connecting flow channel 152 connects the converter 23 and the collecting groove 151, and the coolant in the collecting groove 151 flows to the converter 23 through the first connecting flow channel 152.

[0049] The converter 23 and the stator 13 are arranged on opposite sides of the bracket 15, and the first connecting flow channel 152 is arranged along the radial direction of the rotating shaft 11. There are multiple first connecting flow channels 152, and the multiple first connecting flow channels 152 are arranged at intervals along the circumferential direction of the rotating shaft 11, and the spacing between adjacent first connecting flow channels 152 is equal. Optionally, the groove wall of the collecting groove 151 is provided with an inclined surface inclined toward the direction of the first connecting flow channel 152, and the inclined surface is used to guide the coolant to flow to the first connecting flow channel 152.

[0050] In summary, this embodiment arranges the converter 23 on the inner circumference of the bracket 15 and arranges the first connecting flow channel 152 on the bracket 15, thereby shortening the circulation path of the coolant and simplifying the structure of the outer rotor liquid-cooled motor 1, so that the outer rotor liquid-cooled motor 1 has a compact structure and has the advantages of small size and low weight.

[0051] Please refer to Figure 1-Figure 9In one embodiment, the suction pump 21 is disposed at the end of the rotating shaft 11 away from the rotor 12, and the rotating shaft 11 is also used to drive the suction pump 21 to suck the coolant. The converter 23 is disposed between the bracket 15 and the suction pump 21; the converter 23 has a second connecting flow channel 231 that passes through the outer peripheral side wall of the converter 23 and the inner peripheral side wall of the converter 23, and the second connecting flow channel 231 connects the first connecting flow channel 152 and the suction pump 21, and the coolant in the converter 23 flows to the suction pump 21 through the second connecting flow channel 231.

[0052] The suction pump 21 and the rotor 12 are respectively arranged at opposite ends of the rotating shaft 11, and the central axis of the suction pump 21 coincides with the central axis of the rotating shaft 11. For example, the rotating shaft 11 is connected to the shaft body of the suction pump 21, and the rotating shaft 11 can drive the shaft body of the suction pump 21 to rotate, thereby driving the suction pump 21 to suck the coolant. Optionally, a locking ring 17 is sleeved at the connection between the rotating shaft 11 and the suction pump 21.

[0053] The converter 23 is sleeved on the suction pump 21, for example, Figure 8 As shown, the second connecting flow channel 231 is arranged along the radial direction of the rotating shaft 11. For example, Fig. 9 As shown, the second connecting flow channel 231 is bent, and the second connecting flow channel 231 can also be understood as an S-shaped or S-shaped hole. There are multiple second connecting flow channels 231, and the multiple second connecting flow channels 231 are arranged at intervals along the circumferential direction of the rotating shaft 11, and the spacing between adjacent second connecting flow channels 231 is equal. The second connecting flow channel 231 is arranged in a corresponding manner to the first connecting flow channel 152. Optionally, a seal 24 is provided between the converter 23 and the suction pump 21, and the seal 24 is used to seal the connection between the second connecting flow channel 231 and the first connecting flow channel 152.

[0054] In summary, this embodiment further shortens the circulation path of the coolant and simplifies the structure of the outer rotor liquid-cooled motor 1 by arranging the suction pump 21 coaxially with the rotating shaft 11, using the rotating shaft 11 to drive the suction pump 21, and arranging a second connecting flow channel 231 on the converter 23, thereby making the outer rotor liquid-cooled motor 1 more compact and having the advantages of small size and low weight.

[0055] Please refer to Figure 1-Figure 8 In one embodiment, the converter 23 has a through hole 232, and the through hole 232 passes through the converter 23 along the axial direction of the rotating shaft 11. The through hole 232 is connected to the second channel 1b, and at least part of the through hole 232 is arranged adjacent to the second connecting flow channel 231. The cooling air flow passes through the through hole 232 and flows to the second channel 1b.

[0056] The through holes 232 penetrate the surface of the converter 23 facing the rotor 12 and the surface of the converter 23 facing away from the rotor 12. There are multiple through holes 232, and the multiple through holes 232 are arranged at intervals along the circumferential direction of the rotating shaft 11, and the spacing between adjacent through holes 232 is equal. The cooling airflow passes through the through holes 232 and enters the second channel 1b. For example, some of the through holes 232 are arranged adjacent to the second connecting channel 231, or all of the through holes 232 are arranged adjacent to the second connecting channel 231, so that the cooling airflow in the through holes 232 can exchange heat with the coolant in the second connecting channel 231, thereby cooling the coolant that absorbs heat. Optionally, a heat conductor is provided between the through holes 232 and the second connecting channel 231, and the heat conductor is used to conduct heat energy to improve the efficiency of heat exchange.

[0057] In summary, this embodiment can reduce interference with the cooling airflow and increase the flow rate of the cooling airflow by setting the through hole 232 along the axial direction of the shaft 11 on the converter 23, which is beneficial to improving the effect of heat exchange between the cooling airflow and the coolant.

[0058] Please refer to Figure 1-Figure 6 In one embodiment, the second heat dissipation module 30 further includes an isolating member 32, which is disposed on a surface of the rotor 12 facing the stator 13, and the isolating member 32 is provided with an isolating portion protruding therefrom, and the isolating portion is disposed at a connection between the first channel 1a and the second channel 1b, and the isolating portion is extended in a direction close to the bracket 15.

[0059] The isolating member 32 is disposed around the circumferential direction of the rotating shaft 11. The isolating member 32 is connected to the rotor 12 by a clamping connection, a threaded connection, an adhesive connection, etc., which is not limited in this embodiment. When the rotor 12 rotates, the isolating member 32 also rotates synchronously. The isolating member 32 is used to isolate the first channel 1a from the second channel 1b so as to reduce the interference of the cooling airflow on the first channel 1a. The first channel 1a can form a negative pressure environment so that the coolant can flow along the stator 13 to the collecting tank 151 to achieve heat dissipation of the stator 13.

[0060] The isolating member 32 has an isolating portion, and there is a gap between the isolating portion and the bracket 15. Along the axial direction of the rotating shaft 11, the orthographic projection of part of the isolating portion on the rotating shaft 11 coincides with the orthographic projection of part of the bracket 15 on the rotating shaft 11.

[0061] In summary, this embodiment isolates the first channel 1a from the second channel 1b by setting an isolation member 32, so that the first channel 1a forms a relatively sealed space, ensuring that the coolant circulation system and the cooling gas circulation system can operate smoothly, thereby improving the operating power and reliability of the outer rotor liquid-cooled motor 1.

[0062] Please refer to Figure 1-Figure 10 In one embodiment, the liquid guide tube 22 includes a first ring portion 221, a second ring portion 222, and a connecting portion 223, the first ring portion 221 is sleeved on the second ring portion 222, the connecting portion 223 connects the first ring portion 221 and the second ring portion 222, the first ring portion 221 is located in the first channel 1a, and the first ring portion 221 has a plurality of through holes 2211 arranged at intervals along the circumferential direction of the rotating shaft 11, the second ring portion 222 is connected to the suction pump 21, and the coolant flows to the stator 13 and the first channel 1a through the second ring portion 222, the connecting portion 223, the first ring portion 221, and the through holes 2211 in sequence.

[0063] The second ring portion 222 is located inside the first ring portion 221, and the radial dimension of the first ring portion 221 is larger than the radial dimension of the second ring portion 222. One end of the communication portion 223 is connected to the first ring portion 221, and the other end of the communication portion 223 is connected to the second ring portion 222. There are multiple communication portions 223, and the multiple communication portions 223 are arranged at intervals along the circumferential direction of the rotating shaft 11, and the spacing between adjacent communication portions 223 is equal. For example, the number of communication portions 223 is 4-8. The liquid guide tube 22 is installed on the bracket 15. Optionally, one end of the communication portion 223 passes through the bracket 15 and extends into the first channel 1a. Optionally, the bracket 15 is provided with a snap-fit ​​groove 153, and at least part of the communication portion 223 is arranged in the snap-fit ​​groove 153. There are multiple through holes 2211, and the multiple through holes 2211 are arranged at intervals along the circumferential direction of the rotating shaft 11, and the spacing between adjacent through holes 2211 is equal.

[0064] Specifically, the suction pump 21 sucks the coolant and delivers it to the second ring portion 222. The coolant first passes through the second ring portion 222 for a first uniform distribution, then flows to the first ring portion 221 through the connecting portion 223 for a second uniform distribution, and finally flows to the stator 13 through the through hole 2211 and enters the first channel 1a.

[0065] In summary, this embodiment arranges a liquid guide tube 22 composed of a first ring portion 221, a second ring portion 222, and a connecting portion 223, so as to evenly transport the coolant to the stator 13, so that the coolant is in more complete contact with the stator 13, further improving the heat dissipation efficiency of the outer rotor liquid-cooled motor 1, and further improving the operating power and reliability of the outer rotor liquid-cooled motor 1.

[0066] Please refer to Figure 1-Figure 2 In one embodiment, there are multiple exhaust ports 31, and the multiple exhaust ports 31 are arranged on the circumferential side of the rotor 12 at intervals along the circumferential direction of the rotor 12. The rotating shaft 11 is used to drive the rotor 12 to rotate, thereby driving the multiple exhaust ports 31 to rotate to form the cooling airflow.

[0067] The plurality of air outlets 31 all penetrate the outer peripheral side wall and the inner peripheral side wall of the rotor 12 , and the plurality of air outlets 31 all communicate with the second channel 1 b , and the intervals between adjacent air outlets 31 are equal.

[0068] In summary, this embodiment shortens the circulation path of the cooling airflow and simplifies the structure of the outer rotor liquid-cooled motor 1 by arranging multiple exhaust ports 31 on the circumferential side of the rotor 12, so that the outer rotor liquid-cooled motor 1 has a compact structure and has the advantages of small size and low weight.

[0069] Optionally, the outer rotor liquid-cooled motor further has a third channel, one end of the third channel is connected to the second channel, and the other end is connected to the outside, the third channel is arranged adjacent to the first channel, and the third channel is used to accommodate cooling airflow. The cooling airflow in the third channel performs heat exchange with the coolant in the first channel, further cooling the coolant, thereby improving the heat dissipation efficiency of the outer rotor liquid-cooled motor.

[0070] Further optionally, the heat conducting member is provided between the third channel and the first channel, and the heat conducting member is used for conducting heat. Further optionally, the third channel extends along the circumferential direction of the rotating shaft and is arranged in a spiral shape, and the third channel surrounds the outer peripheral side of the first channel.

[0071] The present application provides an aircraft, which includes a shell, and an outer rotor liquid-cooled motor as provided above in the present application, wherein the outer rotor liquid-cooled motor is installed in the shell.

[0072] The aircraft provided in the present embodiment adopts the outer rotor liquid-cooled motor provided in the first aspect of the present application, and arranges a first heat dissipation module and a second heat dissipation module inside the outer rotor liquid-cooled motor to form a coolant circulation system and a cooling gas circulation system. The coolant is not only used to effectively cool the stator, which greatly improves the heat dissipation efficiency of the outer rotor liquid-cooled motor, and improves the operating power and reliability of the outer rotor liquid-cooled motor, but also uses the cooling airflow to cool the coolant to realize the internal circulation of the coolant in the outer rotor liquid-cooled motor. At the same time, the cooling airflow can also pass through the interior of the outer rotor liquid-cooled motor, further take away the heat energy inside the outer rotor liquid-cooled motor, and cool down other components in the outer rotor liquid-cooled motor, further improving the heat dissipation efficiency of the outer rotor liquid-cooled motor, and further improving the operating power and reliability of the outer rotor liquid-cooled motor.

[0073] Furthermore, in this embodiment, the heat dissipation module is integrated into the outer rotor liquid-cooled motor, so that the outer rotor liquid-cooled motor has a compact structure, and has the advantages of small size and low weight, and is particularly suitable for the application of unmanned aerial vehicles.

[0074] Unless otherwise specified or there is a contradiction, the terms and phrases used in this application have the following meanings: In this application, "first", "second", etc. are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0075] In this application, "one or several" refers to any one, any two or more of the listed items. Among them, "several" refers to any two or more of the listed items.

[0076] In the present application, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0077] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0078] Mentioning "embodiment" and "implementation method" in this application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrases in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments. In addition, it should also be understood that the features, structures or characteristics described in the various embodiments of the present application can be arbitrarily combined to form another embodiment that does not deviate from the spirit and scope of the technical solution of the present application, provided that there is no contradiction between them.

[0079] The above is part of the implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. An outer rotor liquid-cooled motor, characterized in that: The outer rotor liquid-cooled motor comprises: A power module, comprising a rotating shaft, a rotor, and a stator, wherein the rotor is sleeved on the rotating shaft, the rotating shaft is used to drive the rotor to rotate, the stator is arranged around the circumferential direction of the rotating shaft, the outer rotor liquid-cooled motor has a first channel and a second channel, the stator is arranged in the first channel, and the second channel is arranged between the stator and the rotating shaft; a first heat dissipation module, comprising a suction pump, a liquid guide tube, and a converter, wherein the liquid guide tube connects the suction pump and one end of the first channel, the converter connects the other end of the first channel and the suction pump, the suction pump is used to suck cooling liquid, the cooling liquid flows to the stator and the first channel through the liquid guide tube, the cooling liquid in the first channel flows to the suction pump through the converter, and the cooling liquid is used to absorb heat from the stator; and The second heat dissipation module includes an exhaust port arranged on the rotor, the exhaust port is connected to the second channel, the converter is arranged at one end of the second channel away from the exhaust port, the exhaust port is used to form a cooling airflow, the cooling airflow flows through the converter, the second channel, and the exhaust port in sequence, and the cooling airflow is used to cool the coolant located in the converter.

2. The outer rotor liquid-cooled motor according to claim 1, characterized in that: The power module also includes a magnetic component and a bracket. The magnetic component is arranged around the circumferential direction of the rotating shaft and is sleeved on the stator. The magnetic component is connected to the rotor. The bracket is arranged between the rotating shaft and the stator. The first channel is formed between the bracket, the rotor, and the magnetic component. The bracket forms the second channel. The second channel is arranged between the stator and the rotating shaft.

3. The outer rotor liquid-cooled motor according to claim 2, characterized in that: The outer peripheral side wall of the bracket is provided with a liquid collecting groove, the liquid collecting groove is connected to the first channel, and the stator and the opening of the liquid collecting groove are arranged correspondingly, and the liquid collecting groove is used to collect the cooling liquid from the stator and the first channel.

4. The outer rotor liquid-cooled motor according to claim 3, characterized in that: The converter is arranged on the inner circumference side of the bracket, and the bracket has a first connecting flow channel that penetrates the wall of the liquid collecting tank and the inner circumference side wall of the bracket. The first connecting flow channel connects the converter and the liquid collecting tank, and the coolant in the liquid collecting tank flows to the converter through the first connecting flow channel.

5. The outer rotor liquid-cooled motor according to claim 4, characterized in that: The suction pump is arranged at the end of the rotating shaft away from the rotor, and the rotating shaft is also used to drive the suction pump to suck the coolant. The converter is arranged between the bracket and the suction pump; the converter has a second connecting flow channel that runs through the outer peripheral side wall of the converter and the inner peripheral side wall of the converter, and the second connecting flow channel connects the first connecting flow channel and the suction pump, and the coolant in the converter flows to the suction pump through the second connecting flow channel.

6. The outer rotor liquid-cooled motor according to claim 5, characterized in that: The converter has a through hole, which passes through the converter along the axial direction of the rotating shaft. The through hole is connected to the second channel. At least part of the through hole is arranged adjacent to the second connecting flow channel. The cooling air flow passes through the converter through the through hole and flows to the second channel.

7. The outer rotor liquid-cooled motor according to claim 2, characterized in that: The second heat dissipation module also includes an isolating member, which is disposed on a surface of the rotor facing the stator. The isolating member is provided with an isolating portion protruding therefrom, the isolating portion is disposed at a connection between the first channel and the second channel, and the isolating portion extends toward a direction close to the bracket.

8. The outer rotor liquid-cooled motor according to claim 1, characterized in that: The liquid guide tube includes a first ring portion, a second ring portion, and a connecting portion, the first ring portion is sleeved on the second ring portion, the connecting portion connects the first ring portion and the second ring portion, the first ring portion is located in the first channel, and the first ring portion has a plurality of through holes arranged at intervals along the circumferential direction of the rotating shaft, the second ring portion is connected to the suction pump, and the coolant flows to the stator and the first channel through the second ring portion, the connecting portion, the first ring portion, and the through holes in sequence.

9. The outer rotor liquid-cooled motor according to claim 1, characterized in that: There are multiple exhaust ports, which are spaced apart on the circumferential side of the rotor along the circumferential direction of the rotor. The rotating shaft is used to drive the rotor to rotate, thereby driving the multiple exhaust ports to rotate to form the cooling airflow.

10. An aircraft, characterized in that: The aircraft includes a shell, and an outer rotor liquid-cooled motor as described in any one of claims 1 to 9, and the outer rotor liquid-cooled motor is installed in the shell.

Images