High torque axial field motor

Abstract

The application relates to a high-torque axial magnetic field motor, belonging to the motor technical field, which comprises a shell, the shell is provided with an upper annular accommodating groove, a lower annular accommodating groove and a plurality of stator mounting channels, the stator mounting channels are communicated with the upper annular accommodating groove and the lower annular accommodating groove, the plurality of stator mounting channels are equidistantly arranged around the central axis of the shell, a liquid cooling channel is arranged in the shell, the liquid cooling channel sequentially passes by the two sides of each stator mounting channel, and the liquid inlet end and the liquid outlet end of the liquid cooling channel are arranged to extend from the shell; a stator body is arranged in each stator mounting channel, the top end and the bottom end of the stator body are provided with windings, the opposite sides of the two groups of windings are attached to the shell, and the liquid cooling channel is located between the two groups of windings; an upper cover is rotationally arranged on the top of the shell, the upper cover is provided with an upper rotor group; a lower cover is rotationally arranged on the bottom of the shell, and the lower cover is provided with a lower rotor group. The application has the effects of improving the light weight of the motor and improving the heat dissipation efficiency of the motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a high-torque axial magnetic field motor. Background Technology

[0002] Axial magnetic field motors have gained widespread attention in recent years in fields such as aerospace, electric vehicles, and drones due to their advantages such as high power density, large torque output, and compact structure. Especially in the field of low-altitude economic drones, motors often need to output high torque within limited size and weight to meet the requirements of flight conditions such as takeoff, climb, and hovering. Therefore, higher requirements are placed on the power density and heat dissipation performance of the motors.

[0003] However, during high-speed rotation and continuous high-load operation, the stator assembly inside the motor generates a large amount of heat. If heat dissipation is not timely, it will lead to aging of the winding insulation and a decrease in stator efficiency, resulting in a rapid decline in motor performance and affecting the safety and reliability of the aircraft.

[0004] In existing technologies, common cooling methods include air cooling and liquid cooling. Air cooling primarily relies on airflow to remove heat from the motor's interior, making it suitable for low-power motors, but its heat dissipation effect is limited in high-power-density applications. Liquid cooling typically involves arranging liquid cooling pipes around the stator windings, or using potting compound to tightly bond the windings to the cooling pipes, allowing the coolant flow to remove heat from the windings. While liquid cooling offers superior heat dissipation compared to air cooling, this type of structure often suffers from the following drawbacks:

[0005] Firstly, liquid cooling piping requires additional space and fittings, increasing the weight and complexity of the motor;

[0006] Secondly, the heat of the stator core often needs to be conducted to the winding first, and then the coil and coolant exchange heat. The heat of the coil needs to pass through the insulation layer, potting compound or air gap before being conducted to the coolant. Therefore, the overall heat dissipation path of the stator assembly is relatively long and the heat conduction efficiency is limited.

[0007] Third, existing axial field motors typically have only one set of coils on the stator body. By increasing the number of turns and the thickness of the coils, the magnetic pole strength is enhanced, thereby obtaining a larger torque output. However, as the coil thickness continues to increase, the heat inside the coil needs to travel a longer path to be conducted to the external heat dissipation structure, which can easily form local overheating areas inside the coil, leading to insulation aging, increased copper losses, and decreased motor efficiency.

[0008] Therefore, existing motor cooling designs struggle to balance lightweight design with efficient cooling, severely limiting the motor's continuous output capability and reliability in high-power-density applications. This makes it difficult for the motor to operate stably under high load conditions for extended periods, thus restricting further improvements in the overall performance of the drone. Summary of the Invention

[0009] In order to improve the weight reduction and heat dissipation efficiency of the motor, thereby enhancing the continuous output capability and operational reliability of the UAV under high load conditions, this application provides a high torque axial magnetic field motor.

[0010] This application provides a high-torque axial magnetic field motor using the following technical solution:

[0011] A high-torque axial magnetic field motor includes a housing. The housing has an upper annular receiving groove, a lower annular receiving groove, and a plurality of stator mounting channels. The stator mounting channels communicate with the upper annular receiving groove and the lower annular receiving groove. The plurality of stator mounting channels are arranged equidistantly around the central axis of the housing. A liquid cooling channel is provided inside the housing. The liquid cooling channel passes around both sides of each stator mounting channel in sequence. The liquid inlet and liquid outlet of the liquid cooling channel both extend from the housing.

[0012] Each of the stator mounting channels is equipped with a stator body, and the top and bottom ends of the stator body are provided with windings. The opposite sides of the two sets of windings are in contact with the housing, and the liquid cooling channel is located between the two sets of windings.

[0013] The top of the housing is rotatably provided with an upper cover, and the upper cover is provided with an upper rotor assembly;

[0014] The bottom of the housing is rotatably provided with a lower cover, and the lower cover is provided with a lower rotor assembly.

[0015] By adopting the above technical solution, the liquid cooling channel is located directly between the two sets of windings of the stator body, allowing the heat generated on both sides of the stator body and the opposite side of the windings to be conducted to the coolant via the shortest path. Compared with the traditional method of arranging liquid cooling pipes around the windings, this solution reduces the thermal resistance of the insulation layer, potting compound, or air gaps, and also reduces the heat conduction path that the stator body needs to conduct heat to the windings first, and then the windings conduct heat to the coolant, thus significantly improving heat dissipation efficiency and reducing the temperature of the stator body and windings more quickly.

[0016] The combined structure of the upper annular receiving groove, the lower annular receiving groove, and the stator mounting channel not only provides precise positioning and support for the installation of the stator body, but also achieves heat dissipation through the integrally formed liquid cooling channel of the shell. The same structure has the dual functions of installation and heat dissipation, avoiding the use of additional mounting parts and independent cooling pipes, making the design simpler and more integrated;

[0017] Since the liquid cooling channel is directly opened in the shell, there is no need to lay out complicated cooling pipes. This not only reduces the risk of coolant leakage, but also reduces the overall structural weight, making the motor lighter and meeting the dual requirements of high power density and lightweight for low-altitude aircraft.

[0018] By splitting the original single thick coil into two sets of windings located at the top and bottom of the stator body, the thickness of each set of windings is significantly reduced, thereby shortening the path of heat transfer from the inside of the windings to the outside and avoiding the problem of local overheating.

[0019] The two sets of windings work together on the upper and lower rotor groups, maintaining sufficient magnetic pole strength and torque output, significantly improving the motor's torque output capability. Especially in operating conditions requiring continuous high power output, such as drone takeoff, climb, and hovering, this solution ensures the motor has sufficient lift support.

[0020] Therefore, this heat dissipation design can effectively suppress overheating of the stator body and windings during long-term high-load operation, significantly improving the reliability and continuous operation capability of the motor, and is especially suitable for low-altitude economic drones and other occasions with extremely high requirements for safety and stability.

[0021] Optionally, the housing is provided with two sets of clamping plates, which are located in the upper annular receiving groove and the lower annular receiving groove, respectively. The clamping plates correspond one-to-one with the stator mounting channels, and the end of the winding away from the central axis of the housing abuts against the clamping plate.

[0022] One set of windings has one end away from the clamping plate that abuts against the inner wall of the upper annular receiving groove, and the other set of windings has one end away from the clamping plate that abuts against the inner wall of the lower annular receiving groove, with a gap between adjacent clamping plates;

[0023] The housing has two sets of wiring channels, one set of which is connected to the upper annular receiving groove, and the other set of which is connected to the lower annular receiving groove.

[0024] By adopting the above technical solution, the clamping plate, in conjunction with the inner ring sidewall of the upper or lower annular receiving groove, can effectively limit and clamp the winding, making the assembly of the winding simpler and more reliable.

[0025] The winding leads can be arranged through the gap between the two sets of clamping plates and are confined in the space between the clamping plates and the outer ring sidewall of the annular receiving groove, so that the lead routing is clear and compact, which helps to improve the neatness and compactness of the motor interior.

[0026] Optionally, the stator body is a stator tooth, the winding is a flat wire winding, the stator mounting channel is a fan-shaped channel, and the liquid cooling channel includes a plurality of first flow channels, a plurality of second flow channels and a plurality of third flow channels. The first flow channels are arranged along the radial direction of the housing, and the plurality of first flow channels are arranged equidistantly around the central axis of the housing. A stator mounting channel is provided between each two adjacent first flow channels.

[0027] A plurality of second flow channels are equidistantly distributed around the central axis of the housing. The second flow channels are located between the stator mounting channel and the central axis of the housing. Each second flow channel is opposite to one end of the stator mounting channel near the central axis of the housing. Each end of each second flow channel is connected to one of the first flow channels. A stator mounting channel is provided between two adjacent second flow channels.

[0028] Several third flow channels are equidistantly distributed around the central axis of the housing. The stator mounting channel is located between the third flow channel and the central axis of the housing. Each third flow channel is opposite to the end of a stator mounting channel away from the central axis of the housing. Each end of each third flow channel is connected to a first flow channel. A stator mounting channel is provided between two adjacent third flow channels, that is, adjacent third flow channels and second flow channels are staggered.

[0029] The housing has an inlet channel and an outlet channel, wherein two adjacent first channels are respectively connected to the inlet channel and the outlet channel.

[0030] By adopting the above technical solution, the stator body adopts a stator tooth structure and the winding adopts a flat wire winding. This modular design reduces the amount of iron core and winding materials while ensuring electromagnetic performance. The processing technology is simple, which helps to reduce manufacturing costs and achieve the lightweighting of the motor.

[0031] The stator teeth have a smaller width at one end, resulting in a shorter path for heat to be transferred from the heat source to the cooling channel. Compared with the traditional integral stator core, heat can be dissipated more quickly, thereby improving the overall heat dissipation efficiency of the stator body.

[0032] The shapes of the stator mounting channel and liquid cooling channel are matched with the stator teeth, so that the first flow channel can be arranged close to both sides of the stator teeth, thereby directly dissipating heat from both sides of the stator teeth, reducing the intermediate thermal resistance layer, and further improving efficiency.

[0033] The first and second flow channels can simultaneously cover the opposite sides of the two sets of flat wire windings, allowing the high-heat-generating areas of the windings to directly correspond to the liquid cooling channels, ensuring rapid cooling of the windings. The extension direction of the first flow channel is consistent with the extension direction of the side of the stator body, and the extension direction of the second flow channel is consistent with the contour direction of the flat wire windings. This geometric consistency shortens the heat transfer path from the stator body and winding surfaces to the liquid cooling channels, further improving heat dissipation efficiency.

[0034] During processing, the length of the first flow channel can be adjusted to extend the third flow channel into the winding lead area, thus dissipating heat from the leads. Leads also generate heat under high current conditions; if heat is not dissipated in time, it may lead to insulation aging or performance degradation. This solution effectively extends the service life of the leads and insulation materials by cooling the lead area, improving the safety and reliability of motor operation.

[0035] In summary, the first, second, and third flow channels are staggered to form a ring-shaped cooling network covering multiple areas of the stator body and windings. This ensures that the coolant flows evenly throughout the stator area, avoiding the generation of local hot spots. At the same time, the reasonable arrangement of the inlet and outlet channels enables a continuous and stable liquid cooling cycle, further improving cooling efficiency and reliability.

[0036] Optionally, the upper cover is provided with a plurality of first air ducts, the air inlet of the first air duct is located near the central axis of the upper cover and extends to the side of the upper cover away from the stator body, and the air outlet of the first air duct is located near the outer peripheral surface of the upper cover and extends to the side of the upper cover facing the stator body.

[0037] The housing is provided with a plurality of second air ducts, which are arranged around the center line of the housing. The upper part of the second air duct is located between the outer wall of the housing and the outer ring side wall of the upper annular receiving groove, and the lower part of the second air duct is located between the outer wall of the housing and the outer ring side wall of the lower annular receiving groove.

[0038] The lower cover has several third air ducts. The exhaust end of the third air duct is located near the central axis of the lower cover and extends to the side of the lower cover away from the stator body. The inlet end of the third air duct is located near the outer peripheral surface of the upper cover and extends to the side of the upper cover facing the stator body.

[0039] By adopting the above technical solution, air enters and exits through the first air duct. The air enters near the central axis of the upper cover and exits near the outer wall of the upper cover, thus dissipating heat from the upper rotor housing. Then, as the airflow passes through the second air duct, it further assists in cooling the stator body and windings. Combined with the liquid cooling channels inside the housing, this forms a composite heat dissipation mode that integrates liquid and air cooling, further improving the heat dissipation efficiency of the stator and windings. Finally, the airflow enters near the outer wall of the lower cover and exits near the central axis of the lower cover, thus dissipating heat from the lower rotor housing. This helps reduce the risk of demagnetization of the permanent magnets due to overheating, thereby ensuring long-term stable torque output from the motor.

[0040] In addition, the first, second, and third air ducts are all formed by structural openings, which not only facilitates airflow but also reduces the amount of solid material used in the shell, top cover, and bottom cover, further reducing the overall weight and making the motor lighter, thus improving its adaptability to low-altitude UAVs.

[0041] Furthermore, considering the aerodynamic characteristics of the drone rotor, the upper rotor generates a suction effect during rotation, prompting airflow to quickly enter the first air duct, while the lower rotor generates a draft effect during rotation, accelerating the airflow to exit from the third air duct. This further enhances the airflow flow and heat exchange efficiency inside the motor, significantly improving the motor's heat dissipation performance.

[0042] Optionally, a plurality of air guide vanes are provided on the side of the upper cover away from the stator body, and the air guide vanes correspond one-to-one with the first air ducts, and the air guide vanes are provided near the air inlet end of the corresponding first air duct.

[0043] The air guide vane is inclined, and the inclination direction of the air guide vane is the same as that of the rotor blade. The air guide vane gradually narrows to a pointed shape in the direction away from the central axis of the upper cover.

[0044] By adopting the above technical solution, the air guide vane can directionally guide the airflow, allowing the air from the upper rotor to enter the corresponding first air duct more smoothly, reducing airflow dispersion and resistance, and improving airflow entry efficiency.

[0045] The air guide vanes are tilted and their direction is consistent with the tilting direction of the rotor blades, so that the airflow flows smoothly along the direction of rotor rotation, further enhancing the airflow introduction effect and ensuring the cooling effect of the upper rotor assembly.

[0046] The air guide vanes gradually narrow into a pointed shape away from the central axis, which accelerates the airflow when it enters the first air duct, increases the local wind speed, improves the air-cooled heat exchange efficiency, and optimizes the airflow distribution, reducing the generation of eddies or dead zones.

[0047] Optionally, the upper rotor assembly and the lower rotor assembly have the same structure. The upper rotor includes several magnetic steel arrays arranged radially in sequence. Adjacent magnetic steel array rings are in contact with each other. Each magnetic steel array ring is formed by several arc-shaped magnets with the same curvature being spliced ​​together in sequence along the circumferential direction. The arc-shaped magnets are magnetized and arranged according to the Halebeck array.

[0048] By adopting the above technical solution, this segmented design of the magnets effectively reduces eddy current losses and lowers the heat generated by the rotor assembly during high-speed rotation. Furthermore, the magnets are arranged according to a Halebeck array, resulting in a more uniform rotor magnetic field and more stable torque output, ensuring high torque output and improving the overall performance of the motor. Since the rotor assembly consists of individually replaceable arc-shaped magnets, when a magnet is damaged, it is not necessary to replace the entire rotor housing; only the damaged magnet needs to be replaced. This simplifies maintenance operations, reduces maintenance costs, and improves the maintainability and service life of the motor.

[0049] Optionally, the housing is coaxially provided with a rotating shaft mounting channel, the upper annular receiving groove and the lower annular receiving groove are both arranged around the rotating shaft mounting channel, a first annular protrusion is provided in the rotating shaft mounting channel, a first annular slot is provided at the bottom of the rotating shaft mounting channel, and a first annular gasket is provided in the first annular slot.

[0050] It also includes an outer rotating bushing, which is coaxially disposed in the mounting through groove. The outer rotating bushing is fitted with a supporting annular sleeve. A second annular groove is provided at the bottom of the outer rotating bushing. A second annular gasket is disposed in the second annular groove. The top of the first annular protrusion and the top of the second annular gasket jointly support the first bearing. The first annular gasket, the second annular gasket, the supporting annular sleeve, and the first annular protrusion jointly abut against the second bearing. The upper cover, the outer rotating bushing, and the first bearing are interconnected.

[0051] The outer rotating bushing is provided with a second annular protrusion, and the top of the outer rotating bushing is provided with a third annular groove, and a third annular gasket is provided in the third annular groove.

[0052] It also includes an inner rotating shaft, which is coaxially disposed within the outer rotating shaft sleeve. The top of the inner rotating shaft is provided with a first annular stepped groove, and the bottom of the inner rotating shaft is provided with a second annular stepped groove. A locking nut is threadedly connected to the top of the inner rotating shaft. The locking nut, the third annular washer, the second annular protrusion, and the first annular stepped groove together abut against a third bearing. The second annular protrusion and the second annular stepped groove together abut against a fourth bearing. The lower cover is connected to the inner rotating shaft.

[0053] By adopting the above technical solution, the outer rotating bushing and the inner rotating shaft can be supported by multiple bearings respectively, forming a stable multi-bearing support system, which can effectively ensure the coaxiality of the outer rotating bushing and the inner rotating shaft, reduce wobble, and improve the running stability of the motor under high-speed rotation.

[0054] In terms of assembly, the motor shaft can be installed and fixed by sequentially installing the first bearing, outer bushing, second bearing, fourth bearing, inner shaft, third bearing, and locking nut. The assembly steps are clear and facilitate quick installation and disassembly.

[0055] Optionally, the upper cover is connected to a first annular disk, the first annular disk is located between the stator body and the upper rotor assembly, the first annular disk has a fourth air duct, the air inlet end of the fourth air duct corresponds to and is connected to the air inlet end of the first air duct, and the air outlet end of the fourth air duct is set towards the rotational connection between the upper cover and the housing.

[0056] The lower cover is connected to a second annular disk, which is located between the stator body and the lower rotor assembly. The second annular disk has a fifth air duct. The inner rotating shaft has a main air inlet duct and several first branch air ducts. The lower cover has several second branch air ducts. The main air inlet duct is connected to the first branch air ducts. The first branch air ducts correspond to and are connected to the second branch air ducts. The second branch air ducts are connected to the air inlet end of the fifth air duct. The air inlet end of the fifth air duct is located near the inner ring sidewall of the lower annular receiving groove. The exhaust end of the fifth air duct is located towards the rotating connection between the lower cover and the housing.

[0057] By adopting the above technical solution, after the airflow enters the first air duct, it will also be diverted into the fourth air duct connected to it. This allows for the cooling of the outer side of the upper rotor assembly while also directly cooling the side of the upper rotor assembly close to the stator body, shortening the heat conduction path and improving cooling efficiency. At the same time, the fourth air duct continuously discharges airflow from the rotating connection between the upper cover and the housing, which can form a positive blowing under the influence of airflow. This significantly reduces the risk of external dust and impurities being sucked into the upper rotor assembly and the stator body, reducing the possibility of air erosion of the windings, stator body and rotor, thereby improving the service life of the motor.

[0058] The heat generated on the top surface of the stator body and the top surface of the winding during operation can be directly conducted to the first annular disk through the air and carried away by the airflow. This allows the winding and stator body to be cooled not only by liquid cooling channels but also by air cooling to achieve multi-path heat dissipation, thereby greatly improving the heat dissipation effect.

[0059] After being distributed through the main air intake duct, the first branch air duct, and the second branch air duct, the airflow enters the fifth air duct. This allows for direct cooling of the side of the lower rotor assembly closest to the stator body, further reducing the heat conduction path of the lower rotor assembly and improving its heat dissipation efficiency. Simultaneously, the exhaust air from the fifth air duct exits from the rotating connection between the lower cover and the housing, preventing dust from entering the motor and effectively improving the working environment of the lower rotor assembly, stator body, and windings, thus extending the motor's lifespan.

[0060] Furthermore, the heat from the bottom surface of the stator body and the bottom surface of the winding can be conducted to the second annular disk through the air and carried away by the airflow, realizing a composite heat dissipation path in conjunction with the liquid cooling channel, thereby further controlling the overall temperature rise of the stator and winding.

[0061] Meanwhile, since the airflow in the main air intake duct does not need to undergo the heating process of the upper rotor assembly before acting directly on the lower rotor assembly, the heat dissipation efficiency and stability of the lower rotor assembly are improved. Even with the addition of the first and second annular discs, the air ducts of the first and second annular discs themselves, as well as the air ducts of the upper cover, lower cover, and inner shaft, still ensure the lightweight design of the motor and further improve the motor's heat dissipation efficiency and service life.

[0062] Optionally, the outer rotating shaft is provided with an air guide annular plate along its inner wall, the air guide annular plate covers the third bearing, and the air guide annular plate guides the airflow into the main air inlet duct.

[0063] By adopting the above technical solution, the air guide annular plate cover can guide the airflow during motor operation, effectively introducing external airflow into the main air intake duct, thereby ensuring the intake efficiency and stability of the main air intake duct. While guiding the airflow, the air guide annular plate also acts as a barrier to protect the third bearing, preventing airflow from directly impacting the bearing's interior, reducing the bearing's erosion from dust, moisture, and impurities in the air, lowering the risk of grease loss or contamination, thus extending the bearing's service life and improving the reliability of motor operation.

[0064] Optionally, the liquid cooling channel further includes a plurality of fourth channels, a plurality of fifth channels, and a plurality of sixth channels, wherein the fourth channels correspond one-to-one with the first channels and are arranged opposite to each other;

[0065] Several fifth flow channels are equidistantly distributed around the central axis of the shell, and each of the fifth flow channels is connected at both ends to one end of a fourth flow channel near the central axis of the shell, and the fifth flow channels are staggered from the second flow channels;

[0066] Several sixth flow channels are equidistantly distributed around the central axis of the shell, and each of the six sixth flow channels is connected at both ends to one of the fourth flow channels at the end away from the central axis of the shell, and the sixth flow channels are staggered from the third flow channels;

[0067] One of the two adjacent sixth channels is connected to the inlet channel and the outlet channel, respectively.

[0068] By adopting the above technical solution, this dual liquid cooling channel design allows the heat transfer of one stator body near the central axis end of the housing to be directly transferred to the second flow channel opposite it, while the heat transfer of the stator body adjacent to the stator body near the central axis end of the housing to be directly transferred to the sixth flow channel opposite it.

[0069] Similarly, the heat transfer of a winding far from the central axis of the housing can be directly transferred to the third flow channel opposite it, while the heat transfer of the winding adjacent to that winding far from the central axis of the housing can be directly transferred to the sixth flow channel opposite it.

[0070] This ensures that the liquid flows in one direction and that the heat transfer path is the same for each stator body near the central axis of the housing, reducing uneven heat dissipation in multiple areas of multiple stator bodies. It also ensures that the heat transfer path is the same for each winding away from the central axis of the housing, reducing uneven heat dissipation in multiple areas of multiple windings, and further improving the overall heat dissipation effect.

[0071] In summary, this application includes at least one of the following beneficial technical effects:

[0072] 1. The above design achieves efficient heat dissipation and structural integration in the arrangement of the liquid cooling channel, stator body, and windings. This significantly shortens the heat conduction path, improves cooling efficiency, and avoids additional cooling pipes and mounting components, reducing leakage risk and overall weight. Simultaneously, the dual-winding structure balances heat dissipation and electromagnetic performance, preventing localized overheating while maintaining sufficient magnetic pole strength and torque output. This significantly improves high power density and high torque output capability while ensuring a lightweight motor, making it particularly suitable for stable operation of UAVs under high-load conditions such as takeoff, climb, and hovering.

[0073] 2. The modular design of the stator teeth and flat wire windings, along with the matching liquid cooling channel layout, not only reduces material usage and manufacturing costs, achieving motor weight reduction, but also allows the liquid cooling channels to be arranged close to the high-heat areas of the stator teeth and windings, shortening the heat transfer path and significantly improving heat dissipation efficiency. Simultaneously, this solution can effectively cool the winding lead area, preventing insulation aging and improving the safety and reliability of motor operation.

[0074] 3. Air ducts are set in the upper cover, shell and lower cover respectively, so that the airflow cools the upper rotor, stator winding and lower rotor in sequence. Combined with the liquid cooling channel in the shell, a composite heat dissipation mode of liquid cooling and air cooling is formed. This not only effectively reduces the risk of permanent magnet overheating and demagnetization and ensures the motor to output high torque in a stable manner for a long time, but also reduces the amount of structural materials, realizes lightweight design and improves the adaptability of low-altitude UAVs. At the same time, combined with the air intake and exhaust effect of the rotor, the airflow circulation and heat exchange efficiency are further enhanced, significantly improving the overall heat dissipation performance.

[0075] 4. The segmented design of the magnets reduces eddy current losses and heat generation. The Heilbeck array arrangement improves the uniformity of the magnetic field and the stability of torque output. At the same time, the modular arc-shaped magnets are easy to replace individually, reducing maintenance costs and improving motor performance and service life.

[0076] 5. The multi-bearing support structure ensures the coaxiality of the outer rotating bushing and the inner rotating shaft, improving the stability of the motor under high-speed rotation; at the same time, the sequential assembly method makes the installation and disassembly steps of the rotating shaft clear and simple, improving assembly efficiency and maintenance convenience. Attached Figure Description

[0077] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0078] Figure 2 This is a schematic diagram of the structure of the upper annular receiving groove and the lower annular receiving groove in Embodiment 1 of this application.

[0079] Figure 3 This is a schematic diagram of the structure of the liquid cooling channel used in Embodiment 1 of this application.

[0080] Figure 4 This is a schematic diagram of the structure of the stator body and windings in Embodiment 1 of this application.

[0081] Figure 5 This is an assembly drawing of Embodiment 1 of this application, illustrating the stator body, windings, and housing.

[0082] Figure 6 This is a schematic diagram of the structure of the outer rotating bushing and the inner rotating shaft in Embodiment 1 of this application.

[0083] Figure 7 This is a schematic diagram of the structure of the upper and lower covers used in Embodiment 1 of this application.

[0084] Figure 8 This is a schematic diagram of the structure of the magnet used in Embodiment 1 of this application.

[0085] Figure 9 This is a schematic diagram of the structure of the first annular disk and the second annular disk in Embodiment 2 of this application.

[0086] Figure 10 yes Figure 9 An enlarged schematic diagram of part A in the middle.

[0087] Figure 11 yes Figure 9 Enlarged schematic diagram of part B.

[0088] Figure 12 This is a schematic diagram of the structure of the liquid cooling channel used in Embodiment 3 of this application.

[0089] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Second air duct; 12. Upper annular receiving groove; 13. Lower annular receiving groove; 14. Stator mounting channel; 15. Shaft mounting channel; 151. First annular groove; 16. First annular protrusion; 17. Liquid cooling channel; 171. First flow channel; 172. Second flow channel; 173. Third flow channel; 174. Fourth flow channel; 175. Fifth flow channel; 176. Sixth flow channel; 18. Cable hole; 19. First annular plate; 110. Second annular straight plate; 2. External conduit junction box; 21. Liquid inlet channel; 22. Liquid outlet channel; 23. Wiring channel; 3. Clamping plate; 4. Stator body; 5. Winding; 61. First bearing; 62. Outer rotating shaft sleeve; 621. Second annular groove; 622. Second annular protrusion; 623. Third annular groove; 63. 64. Supporting annular sleeve; 65. Second bearing; 66. First annular gasket; 67. Second annular gasket; 68. Third annular gasket; 69. Inner rotating shaft; 691. First annular stepped groove; 692. Second annular stepped groove; 693. Main air inlet duct; 694. First branch air duct; 610. Fourth bearing; 611. Tightening nut; 7. Top cover; 71. First air duct; 72. Air guide plate; 73. First mounting groove; 74. First annular straight plate; 75. First annular disc; 751. Fourth air duct; 81. Upper rotor assembly; 82. Lower rotor assembly; 83. Magnet; 9. Lower cover; 91. Third air duct; 92. Second annular plate; 93. Second annular disc; 931. Fifth air duct; 94. Second branch air duct; 95. Air guide annular plate; 96. Second mounting groove. Detailed Implementation

[0090] The following is in conjunction with the appendix Figure 1-12 This application will be described in further detail.

[0091] Example 1

[0092] Embodiment 1 of this application discloses a high-torque axial magnetic field motor.

[0093] like Figure 1 and Figure 2The high-torque axial magnetic field motor includes a housing 1, which is cylindrical. A conduit junction box 2 is integrally formed with the housing 1 on its outer periphery. The conduit junction box 2 has an inlet channel 21, an outlet channel 22, and two sets of wiring channels 23, with the inlet channel 21 and outlet channel 22 located between the two sets of wiring channels 23. Several second air ducts 11 are formed along the contour of the housing 1, extending to the top and bottom surfaces of the housing 1. Except for two larger second air ducts near the sides of the housing 1, all other second air ducts 11 are the same size.

[0094] The housing 1 has an upper annular receiving groove 12 and a lower annular receiving groove 13. The upper annular receiving groove 12, the lower annular receiving groove 13, and the housing 1 are coaxial. A plurality of second air ducts 11 are arranged around the upper annular receiving groove 12 and the lower annular receiving groove 13, that is, the second air ducts 11 are arranged near the outer side wall of the housing 1 compared to the upper annular receiving groove 12 and the lower annular receiving groove 13. The upper annular receiving groove 12 extends to the top of the housing 1, and the lower annular receiving groove 13 extends to the bottom of the housing 1. The upper annular receiving groove 12 and the lower annular receiving groove 13 have the same depth.

[0095] The housing 1 also has several stator mounting channels 14, which are fan-shaped channels and communicate with the upper annular receiving groove 12 and the lower annular receiving groove 13. The stator mounting channels 14 are arranged equidistantly around the central axis of the housing 1. In other embodiments, the stator mounting channels 14 can be square channels, adapted to conventional stator cores.

[0096] The housing 1 also has a coaxial rotating shaft mounting channel 15. An upper annular receiving groove 12 and a lower annular receiving groove 13 are arranged around the rotating shaft mounting channel 15, that is, the inner diameter of the upper annular receiving groove 12 and the lower annular receiving groove 13 is larger than the inner diameter of the rotating shaft mounting channel 15. A first annular protrusion 16 is provided in the middle region of the rotating shaft mounting channel 15, and a first annular slot 151 is provided on the bottom side wall of the rotating shaft mounting channel 15.

[0097] like Figure 3 The housing 1 also has a liquid cooling channel 17, which includes a number of first flow channels 171, a number of second flow channels 172, and a number of third flow channels 173. The first flow channels 171 extend radially along the housing 1, and the number of first flow channels 171 are equidistantly distributed around the central axis of the housing 1, that is, the central axes of all the first flow channels 171 in the length direction intersect at the same point on the central axis of the housing 1, and a first flow channel 171 is provided between each adjacent stator mounting channel 14;

[0098] The second flow channel 172 extends along the tangential direction of the rotating shaft mounting channel 15. A plurality of second flow channels 172 are equidistantly distributed around the central axis of the housing 1, and both ends of each second flow channel 172 are transitioned through an arc flow channel and connected to a first flow channel 171. Furthermore, a stator mounting channel 14 is provided between two adjacent second flow channels 172, and the middle section of each second flow channel 172 is positioned opposite to one end of a stator mounting channel 14 near the central axis of the housing 1.

[0099] The third flow channel 173 extends along the tangential direction of the upper annular receiving groove 12. Several third flow channels 173 are equidistantly distributed around the central axis of the housing 1, and both ends of each third flow channel 173 are connected to a first flow channel 171 via arc flow channels. Furthermore, a stator mounting channel 14 is provided between two adjacent third flow channels 173, and each third flow channel 173 is positioned opposite the end of a stator mounting channel 14 away from the central axis of the housing 1. The first flow channels 171 connected to both ends of the third flow channel 173 are each connected to a second flow channel 172. Thus, several first flow channels 171, several second flow channels 172, and several third flow channels 173 together form a "flower"-shaped single-flow channel. Moreover, a pair of adjacent first flow channels 171 are connected to the inlet channel 21 and the outlet channel 22, respectively.

[0100] In other embodiments, each second flow channel 172 may be an arc-shaped flow channel, and the arc of the second flow channel 172 is the same as the arc of the stator mounting channel 14 near the central axis of the housing 1. Each third flow channel 173 may be an arc-shaped flow channel, and the arc of the third flow channel 173 is the same as the arc of the stator mounting channel 14 away from the central axis.

[0101] like Figure 1 and Figure 2 The housing 1 contains several clamping plates 3, divided into two groups: one group located in the upper receiving groove and the other in the lower receiving groove. The clamping plates 3 are integrally formed with the housing 1. The clamping plates 3 are arranged equidistantly around the central axis of the housing 1, and each clamping plate 3 corresponds to a stator mounting channel 14. The clamping plate 3 is positioned near the end of the stator mounting channel 14 furthest from the central axis of the housing 1, meaning the stator mounting channel 14 is located between the inner wall of the upper annular receiving groove 12 and the clamping plate 3. The clamping plate 3 is an arc-shaped plate, and the arc of the clamping plate 3 is the same as the arc of the end of the stator mounting channel 14 furthest from the central axis of the housing 1. A wire-threading gap is provided between adjacent clamping plates 3.

[0102] The housing 1 has several wire-passing holes 18, which communicate with the upper annular receiving groove 12 and the lower annular receiving groove 13. The wire-passing holes 18 are arranged equidistantly around the central axis of the housing 1. The wire-passing holes 18 are located between the clamping plate 3 and the outer ring sidewall of the upper annular receiving groove 12, and each wire-passing hole 18 is correspondingly provided with a clamping plate 3. In each pair of adjacent clamping plates 3, only one clamping plate 3 is provided with a wire-passing hole 18, so that the clamping plate 3 and the wire-passing hole 18 are staggered. One set of wiring channels 23 communicates with the upper annular receiving groove 12, and another set of wiring channels 23 communicates with the lower annular receiving groove 13. The third flow channel 173 is located between the clamping plate 3 and the outer ring sidewall of the upper annular receiving groove 12.

[0103] The housing 1 can be made by 3D printing.

[0104] like Figure 4 and Figure 5 Each stator mounting channel 14 contains a stator body 4. In this embodiment, the stator body 4 is a stator tooth; in other embodiments, the stator body 4 can be a stator core. The stator body 4 is secured within the stator mounting channel 14, meaning that both sides of the stator body 4 abut against the sidewalls of the stator mounting channel 14, and a gap is left between each end of the stator body 4 and the stator mounting channel 14. This design facilitates the assembly of the stator body 4. The top and bottom of the stator body 4 extend out of the stator mounting channel 14; that is, the top of the stator body 4 is located within the upper annular receiving groove 12, and the bottom of the stator body 4 is located within the lower annular receiving groove 13. Windings 5 ​​are wound around the top and bottom of the stator body 4. In this embodiment, the windings 5 ​​are flat wire windings; in other embodiments, the windings 5 ​​can be coils. The opposing sides of the two windings 5 ​​on one stator body 4 are both in contact with the mounting housing 1, so that the first flow channel 171 and the second flow channel 172 are both located between the two sets of windings 5.

[0105] The end of the winding 5 in the upper annular receiving groove 12 away from the central axis of the housing 1 is pressed against the clamping plate 3, and the end of the winding 5 in the upper annular receiving groove 12 near the central axis of the housing 1 is pressed against the inner ring sidewall of the upper annular receiving groove 12. The end of the winding 5 in the lower annular receiving groove 13 away from the central axis of the housing 1 is pressed against the clamping plate 3, and the end of the winding 5 in the lower annular receiving groove 13 near the central axis of the housing 1 is pressed against the inner ring sidewall of the lower annular receiving groove 13.

[0106] The winding 5 leads in the upper annular receiving groove 12 pass between two adjacent clamping plates 3 and are arranged between the clamping plates 3 and the outer ring sidewall of the upper annular receiving groove 12. The winding 5 leads in the lower annular receiving groove 13 pass between two adjacent clamping plates 3 and are arranged between the upper clamping plate 3 and the sidewall of the lower annular receiving groove 13. This makes the third flow channel 173 located between the leads of the two sets of windings 5. The winding 5 leads in the upper annular receiving groove 12 extend from one set of wiring channels 23, and the winding 5 leads in the lower annular receiving groove 13 extend from another set of wiring channels 23. The gaps between the stator body 4 and the stator mounting channel 14, and the gaps between adjacent windings 5, are filled with potting compound to improve heat conduction.

[0107] like Figure 6 A first bearing 61 and a second bearing 64 are coaxially arranged in the shaft mounting channel 15. The first bearing 61 is supported on the first annular protrusion 16 and coaxially supports an outer rotating shaft sleeve 62. A supporting annular sleeve 63 is fitted around the outer circumference of the outer rotating shaft sleeve 62. The supporting annular sleeve 63 abuts against the bottom of the inner ring of the first bearing 61. The second bearing 64 is also fitted around the outer rotating shaft sleeve 62. A second annular groove 621 is opened on the inner wall of the outer circumference of the outer rotating shaft sleeve 62. A first annular gasket 65 is arranged in the first annular groove 621 and a second annular gasket 66 is arranged in the second annular groove 621. The first annular gasket 65 supports the bottom of the outer ring of the second bearing 64, and the second annular gasket 66 supports the bottom of the inner ring of the second bearing 64.

[0108] The outer rotating bushing 62 has an integrally formed second annular protrusion 622, which is located in the middle of the inner wall of the outer rotating bushing 62. The inner wall of the outer rotating bushing 62 also has a third annular groove 623, in which a third annular gasket 67 is provided. The outer rotating bushing 62 has a third bearing 68, which is supported on the second annular protrusion 622. The third annular gasket 67 abuts against the top of the outer ring of the third bearing 68. An inner rotating shaft 69 is coaxially arranged inside the outer rotating shaft sleeve 62. The outer wall of the inner rotating shaft 69 near its top has a first annular stepped groove 691, and the bottom of the inner rotating shaft 69 has a second annular stepped groove 692. The inner ring of the third bearing 68 is supported on the first annular stepped groove 691, and a fourth bearing 610 is supported on the second annular stepped groove 692. The fourth bearing 610 abuts against the bottom wall of the second annular protrusion 622. The top of the inner rotating shaft 69 is threadedly connected to a clamping nut 611, which abuts against the top of the outer ring of the third bearing 68.

[0109] like Figure 6 and Figure 7The top of the outer rotating bushing 62 is supported by an upper cover 7, which is bolted to the inner ring of the first bearing 61. The upper cover 7 has several first air ducts 71, the number of which is the same as the number of stator mounting channels 14. These first air ducts 71 are equidistantly arranged around the central axis of the housing 1, extending radially along the upper cover 7. The air inlet of each first air duct 71 extends to the windward side (top surface) of the upper cover 7, and is located near the center of the upper cover 7, with an approximately elliptical shape. The air outlet of each first air duct 71 extends to the leeward side (bottom surface) of the upper cover 7, and is located near the outer side wall of the upper cover 7, with a circular shape. The air outlet of each first air duct 71 faces the air inlet of the second air duct 11.

[0110] The top of the upper cover 7 is provided with several air guide vanes 72, each corresponding to a first air duct 71. The air guide vanes 72 are positioned near the air inlet of the first air duct 71, creating an alternating arrangement between the air guide vanes 72 and the exhaust ends of the first air ducts 71. The air guide vanes 72 are inclined in the same direction as the rotor blades, and gradually narrow to a pointed shape away from the central axis of the upper cover 7. Simultaneously, the frontal projection of the air guide vanes 72 covers a portion of the exhaust end of the first air duct 71.

[0111] The bottom of the inner rotating shaft 69 is bolted to a lower cover 9. Several third air ducts 91 are formed inside the lower cover 9, the number of which is the same as the number of stator mounting channels 14. These third air ducts 91 are arranged equidistantly around the central axis of the housing 1, extending radially along the lower cover 9. The air inlet of each third air duct 91 extends to the windward side (top surface) of the lower cover 9, and is located near the outer side wall of the lower cover 9. The air inlet of each third air duct 91 is circular. The air outlet of each third air duct 91 extends to the leeward side (bottom surface) of the lower cover 9, and is located near the center of the lower cover 9. The air outlet of each third air duct 91 is approximately elliptical. The air inlet of each third air duct 91 faces the air outlet of the second air duct 11.

[0112] The leeward side (bottom) of the top cover 7 is provided with a first mounting groove 73, and the upper rotor assembly 81 is installed in the first mounting groove 73.

[0113] The windward side (top surface) of the lower cover 9 is provided with a second mounting groove 96, and the lower rotor assembly 82 is installed in the second mounting groove 96.

[0114] like Figure 8In this embodiment, the upper rotor group 81 and the lower rotor group 82 have the same structure. The upper rotor group 81 includes several arrays of magnets 83 arranged radially in sequence. Adjacent magnet arrays 83 are in close contact with each other. Each magnet array 83 is formed by several arc-shaped magnets 83 with the same curvature being sequentially spliced ​​along the circumference. The arc-shaped magnets 83 are magnetized and arranged according to a Hellbeck array. In other embodiments, the upper rotor group 81 and the lower rotor group 82 can be conventional disc rotors.

[0115] like Figure 6 The top surface of the housing 1 is provided with a first annular plate 19, which is located between the second air duct 11 and the clamping plate 3. The top surface of the lower cover 9 is provided with a second annular plate 92, which is also located between the second air duct 11 and the clamping plate 3. The bottom surface of the upper cover 7 is provided with a first annular straight plate 74, and the bottom surface of the housing 1 is provided with a second annular straight plate 110. The first annular straight plate 74 is arranged around the outside of the first annular plate 19, and the second annular straight plate 110 is arranged around the outside of the second annular plate 92, so that annular Z-shaped channels are formed between the first annular straight plate 74 and the first annular plate 19, and between the second annular straight plate 110 and the second annular plate 92, thereby reducing the amount of gas entering between the stator body 4 and the upper rotor assembly 81, and between the stator body 4 and the lower rotor assembly 82.

[0116] The implementation principle of this embodiment is as follows: The upper cover 7 of the motor is connected to the upper rotor, and the lower cover 9 is connected to the lower rotor. During rotation, the upper rotor creates a suction effect, causing airflow to quickly enter the first air duct 71. The air enters the first air duct 71 and then exits. The air enters near the central axis of the upper cover 7 and exits near the outer wall of the upper cover 7, thus dissipating heat from the upper rotor assembly 81. Then, as the airflow passes through the second air duct 11, it further assists in cooling the stator body 4 and windings 5. The lower rotor, during rotation, generates a suction effect, accelerating the airflow through the second air duct 11 and exiting through the third air duct 91. The airflow enters near the outer wall of the lower cover 9 and exits near the central axis of the lower cover 9, thus dissipating heat from the lower rotor assembly 82.

[0117] Furthermore, during operation, the motor continuously inputs cooling liquid into the liquid cooling channel 17. The liquid cooling channel 17 is located directly between the two sets of windings 5 ​​of the stator body 4, so that the heat generated on both sides of the stator body 4 and the opposite side of the windings 5 ​​can be conducted to the cooling liquid through the shortest path.

[0118] Compared with the traditional method of arranging liquid cooling pipes around winding 5, this solution reduces the thermal resistance of insulation layer, potting compound or air gap, and also reduces the heat conduction path that the stator body 4 needs to conduct heat to winding 5 first, and then the winding 5 conducts heat with coolant, which greatly improves heat dissipation efficiency and thus reduces the temperature of stator body 4 and winding 5 more quickly.

[0119] The combined structure of the upper annular receiving groove 12, the lower annular receiving groove 13, and the stator mounting channel 14 not only provides precise positioning and support for the installation of the stator body 4, but also achieves heat dissipation through the liquid cooling channel 17 integrally formed in the housing 1. The same structure has both installation and heat dissipation functions, avoiding the use of additional mounting parts and independent cooling pipes, making the design simpler and more integrated;

[0120] By splitting the original single thick coil into two sets of windings 5 ​​located at the top and bottom of the stator body 4 respectively, the thickness of each set of windings 5 ​​is significantly reduced, thereby shortening the path of heat transfer from inside the windings 5 ​​to the outside and avoiding the problem of local overheating.

[0121] The two sets of windings 5 ​​work together on the upper rotor assembly 81 and the lower rotor assembly 82, maintaining sufficient magnetic pole strength and torque output, significantly improving the motor's torque output capability. Especially in operating conditions requiring continuous high power output, such as drone takeoff, climb, and hovering, this solution ensures that the motor has sufficient lift support.

[0122] Therefore, this heat dissipation design can effectively suppress overheating of the stator body 4 and winding 5 during long-term high-load operation, reducing the risk of demagnetization of the permanent magnet due to overheating. This ensures long-term stable output torque of the motor, significantly improving the reliability and continuous operation capability of the motor. Simultaneously, since the liquid cooling channel 17 is directly opened within the housing 1, there is no need for additional complex cooling pipes, which not only reduces the risk of coolant leakage but also lightens the overall structural weight. The first air duct 71, the second air duct 11, and the third air duct 91 are all structurally formed, which not only facilitates airflow but also reduces the amount of solid material used in the housing 1, upper cover 7, and lower cover 9, further reducing the overall weight and making the motor lighter. This design is particularly suitable for low-altitude economic drones and other applications requiring extremely high safety and stability.

[0123] Example 2

[0124] Reference Figure 9 , Figure 10 and Figure 11The difference between this embodiment and Embodiment 1 is that a first annular disk 75 is bolted to the bottom surface of the upper cover 7. The first annular disk 75 is located between the stator body 4 and the upper rotor assembly 81. A fourth air duct 751 is formed inside the first annular disk 75. The fourth air duct 751 can be multiple radially arranged channels or a continuous annular channel. The air inlet end of the fourth air duct 751 corresponds to and is connected to the air inlet end of the first air duct 71, that is, the side wall of the air inlet end of the first air duct 71 has a channel, and this channel is connected to the air inlet end of the fourth air duct 751. The air outlet end of the fourth air duct 751 is arranged towards the rotating connection between the upper cover 7 and the housing 1, that is, the air outlet end of the fourth air duct 751 is arranged towards the annular Z-shaped channel between the upper cover 7 and the housing 1.

[0125] The top surface of the lower cover 9 is bolted to a second annular disk 93, which is located between the stator body 4 and the lower rotor assembly 82. The second annular disk 93 has several fifth air ducts 931, which can be multiple radially arranged channels or a continuous annular channel.

[0126] The inner rotating shaft 69 has a main air inlet 693 coaxially formed along its length. Several first diversion air ducts 694 are equidistantly formed along the circumference of the bottom of the inner rotating shaft 69. Several second diversion air ducts 94 are formed on the lower cover 9. The second diversion air ducts 94 are located between the third air duct 91 and the central axis of the lower cover 9. The second diversion air ducts 94 correspond one-to-one with and are connected to the first diversion air ducts 694. The first diversion air ducts 694 are connected to the air inlet end of the fifth air duct 931. The exhaust end of the fifth air duct 931 is positioned towards the rotating connection between the lower cover 9 and the housing 1, that is, the exhaust end of the fifth air duct 931 is positioned towards the annular Z-shaped channel between the lower cover 9 and the housing 1.

[0127] An air guide annular plate 95 is bolted to the inner wall of the outer rotating bushing 62. The air guide annular plate 95 covers the third bearing 68. The air guide annular plate 95 is used to guide the airflow into the main air inlet duct 693. The air guide annular plate 95 is a truncated cone annular plate. The guide surface of the air guide annular plate 95 is inclined towards the main air inlet duct 693.

[0128] Both the first annular disk 75 and the second annular disk 93 are thin plates, and both are made of non-magnetic and non-conductive materials, such as glass fiber composite material G10, ceramics, engineering plastics, polyimide film, etc. These materials are equivalent to replacing air with a solid with a similar magnetic permeability (μ≈1), which will not generate eddy current losses or magnetic short circuits, and will have almost no negative impact on motor performance.

[0129] The implementation principle of Example 2 is as follows: After the airflow enters the first air duct 71, it will also be diverted into the fourth air duct 751 connected to it. This allows for the cooling of the outer side of the upper rotor assembly 81, as well as the direct cooling of the side of the upper rotor assembly 81 close to the stator body 4, shortening the heat conduction path and improving cooling efficiency. At the same time, the fourth air duct 751 continuously discharges airflow from the rotating connection between the upper cover 7 and the housing 1, which can form a positive blowing under the drive of the airflow. This significantly reduces the risk of external dust and impurities being sucked into the upper rotor assembly 81 and the stator body 4, reducing the possibility of air erosion of the winding 5, stator body 4 and rotor, thereby improving the service life of the motor.

[0130] The heat generated on the top surface of the stator body 4 and the top surface of the winding 5 during operation can be directly conducted to the first annular disk 75 through the air and carried away by the airflow. This allows the winding 5 and the stator body 4 to be cooled not only by the liquid cooling channel 17, but also by air cooling to achieve multi-path heat dissipation, thereby greatly improving the heat dissipation effect.

[0131] After being distributed through the main air intake duct 693, the first branch air duct 694, and the second branch air duct 94, the airflow enters the fifth air duct 931. This allows for direct cooling of the side of the lower rotor assembly 82 closest to the stator body 4, further reducing the heat conduction path of the lower rotor assembly 82 and improving its heat dissipation efficiency. Simultaneously, the exhaust air from the fifth air duct 931 is also discharged from the rotating connection between the lower cover 9 and the housing 1, preventing dust from entering the motor and effectively improving the working environment of the lower rotor assembly 82, the stator body 4, and the windings 5, thus extending the motor's lifespan.

[0132] Furthermore, the heat from the bottom surface of the stator body 4 and the bottom surface of the winding 5 can also be conducted to the second annular disk 93 through the air and carried away by the airflow, realizing a composite heat dissipation path in coordination with the liquid cooling channel 17, so that the overall temperature rise of the stator and winding 5 can be further controlled.

[0133] Meanwhile, since the airflow in the main air intake duct 693 does not need to pass through the heating process of the upper rotor assembly 81 before acting directly on the lower rotor assembly 82, the heat dissipation efficiency and stability of the lower rotor assembly 82 are improved. Even with the addition of the first annular disk 75 and the second annular disk 93, the air ducts of the first annular disk 75 and the second annular disk 93 themselves, as well as the air ducts of the upper cover 7, the lower cover 9, and the inner rotating shaft 69, still ensure the lightweight design of the motor and further improve the motor's heat dissipation efficiency and service life.

[0134] Example 3

[0135] Reference Figure 12The difference between this embodiment and embodiment 1 is that the liquid cooling channel 17 further includes a plurality of fourth flow channels 174, a plurality of fifth flow channels 175 and a plurality of sixth flow channels 176. The fourth flow channels 174 correspond one-to-one with the first flow channels 171 and are arranged opposite to each other. The fourth flow channels 174 are located above the first flow channels 171.

[0136] Several fifth flow channels 175 are equidistantly distributed around the central axis of the shell 1. Each end of the fifth flow channel 175 is connected to the end of a fourth flow channel 174 near the central axis of the shell 1. The fifth flow channels 175 are staggered from the second flow channels 172 and are located above the second flow channels 172.

[0137] Several sixth flow channels 176 are equidistantly distributed around the central axis of the housing 1. Each sixth flow channel 176 is connected at both ends to a fourth flow channel 174 and at the end away from the central axis of the housing 1. The sixth flow channels 176 are staggered from the third flow channels 173 and are located above the third flow channels 173.

[0138] Both the inlet channel 21 and the outlet channel 22 are connected to a diversion pipe. The diversion pipe is connected to a sixth flow channel 176 and a first flow channel 171. The sixth flow channels 176 connected by the two diversion pipes are arranged adjacent to each other, and the first flow channels 171 connected by the two diversion pipes are arranged adjacent to each other.

[0139] That is, a number of first flow channels 171, a number of second flow channels 172 and a number of third flow channels 173 together form a single flow channel in the shape of a "flower", and a number of fourth flow channels 174, a number of fifth flow channels 175 and a number of sixth flow channels 176 together form a single flow channel in the shape of a "flower". The two are parallel to each other but staggered.

[0140] The implementation principle of Example 3 is as follows: This design of the dual liquid cooling channels 17 allows the heat transfer of a stator body 4 near the central axis end of the housing 1 to be directly transferred to the second flow channel 172 opposite to it, while the heat of the stator body 4 adjacent to the stator body 4 near the central axis end of the housing 1 can be directly transferred to the sixth flow channel 176 opposite to it.

[0141] Similarly, the heat transfer of the end of a winding 5 away from the central axis of the housing 1 can be directly transferred to the third flow channel 173 opposite to it, while the heat transfer of the end of the winding 5 adjacent to the winding 5 away from the central axis of the housing 1 can be directly transferred to the sixth flow channel 176 opposite to it.

[0142] This ensures that the liquid flows in a unidirectional direction, and also ensures that the heat transfer path of each stator body 4 near the central axis of the housing 1 is the same, reducing the uneven heat dissipation in multiple areas of multiple stator bodies 4. It also ensures that the heat transfer path of each winding 5 away from the central axis of the housing 1 is the same, reducing the uneven heat dissipation in multiple areas of multiple windings 5, and further improving the overall heat dissipation effect.

[0143] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-torque axial magnetic field motor, characterized in that: The device includes a housing (1), which has an upper annular receiving groove (12), a lower annular receiving groove (13) and a plurality of stator mounting channels (14). The stator mounting channels (14) are connected to the upper annular receiving groove (12) and the lower annular receiving groove (13). The plurality of stator mounting channels (14) are arranged equidistantly around the central axis of the housing (1). A liquid cooling channel (17) is provided inside the housing (1). The liquid cooling channel (17) passes around both sides of each stator mounting channel (14) in sequence. The liquid inlet and liquid outlet of the liquid cooling channel (17) both extend from the housing (1). Each of the stator mounting channels (14) is equipped with a stator body (4), and the top and bottom ends of the stator body (4) are provided with windings (5). The opposite sides of the two sets of windings (5) are in contact with the housing (1). The liquid cooling channel (17) is located between the two sets of windings (5). The top of the housing (1) is rotatably provided with an upper cover (7), and the upper cover (7) is provided with an upper rotor assembly (81); The bottom of the housing (1) is rotatably provided with a lower cover (9), and the lower cover (9) is provided with a lower rotor assembly (82); The upper cover (7) is provided with a plurality of first air ducts (71). The air inlet end of the first air duct (71) is located near the central axis of the upper cover (7) and extends to the side of the upper cover (7) away from the stator body (4). The air outlet end of the first air duct (71) is located near the outer peripheral surface of the upper cover (7) and extends to the side of the upper cover (7) facing the stator body (4). The housing (1) is coaxially provided with a rotating shaft mounting channel (15); It also includes an outer rotating bushing (62), which is coaxially disposed within the rotating shaft mounting channel (15); It also includes an inner rotating shaft (69), which is coaxially disposed inside the outer rotating shaft sleeve (62); The upper cover (7) is connected to a first annular disk (75), which is located between the stator body (4) and the upper rotor assembly (81). The first annular disk (75) has a fourth air duct (751). The air inlet of the fourth air duct (751) corresponds to and is connected to the air inlet of the first air duct (71). The air outlet of the fourth air duct (751) is set towards the rotating connection between the upper cover (7) and the housing (1). The lower cover (9) is connected to a second annular disk (93), which is located between the stator body (4) and the lower rotor assembly (82). The second annular disk (93) has a fifth air duct (931). The inner rotating shaft (69) has a main air inlet duct (693) and several first branch air ducts (694). The lower cover (9) has several second branch air ducts (94). The main air inlet duct (693) is connected to the first branch air duct (694). The first branch air duct (694) corresponds to and is connected to the second branch air duct (94). The second branch air duct (94) is connected to the air inlet end of the fifth air duct (931). The air inlet end of the fifth air duct (931) is located near the inner ring side wall of the lower annular receiving groove (13). The exhaust end of the fifth air duct (931) is located towards the rotating connection between the lower cover (9) and the housing (1).

2. The high-torque axial magnetic field motor according to claim 1, characterized in that: The housing (1) is provided with two sets of clamping plates (3), which are located in the upper annular receiving groove (12) and the lower annular receiving groove (13) respectively. The clamping plates (3) correspond one-to-one with the stator mounting channel (14), and the end of the winding (5) away from the central axis of the housing (1) abuts against the clamping plate (3). One end of one set of windings (5) away from the clamping plate (3) abuts against the inner ring sidewall of the upper annular receiving groove (12), and the other end of the windings (5) away from the clamping plate (3) abuts against the inner ring sidewall of the lower annular receiving groove (13). The housing (1) has two sets of wiring channels (23), one set of wiring channels (23) is connected to the upper annular receiving groove (12), and the other set of wiring channels (23) is connected to the lower annular receiving groove (13).

3. The high-torque axial magnetic field motor according to claim 1, characterized in that: The stator body (4) is a stator tooth, the winding (5) is a flat wire winding, the stator mounting channel (14) is a fan-shaped channel, and the liquid cooling channel (17) includes a plurality of first flow channels (171), a plurality of second flow channels (172) and a plurality of third flow channels (173). The first flow channels (171) are arranged along the radial direction of the housing (1), and the plurality of first flow channels (171) are arranged equidistantly around the central axis of the housing (1). A stator mounting channel (14) is provided between each two adjacent first flow channels (171). A plurality of second flow channels (172) are equidistantly distributed around the central axis of the housing (1). The second flow channels (172) are located between the stator mounting channel (14) and the central axis of the housing (1). Each second flow channel (172) is opposite to one end of the stator mounting channel (14) near the central axis of the housing (1). Each end of each second flow channel (172) is connected to one of the first flow channels (171). A stator mounting channel (14) is provided between two adjacent second flow channels (172). Several third flow channels (173) are equidistantly distributed around the central axis of the housing (1). The stator mounting channel (14) is located between the third flow channels (173) and the central axis of the housing (1). Each third flow channel (173) is opposite to one end of a stator mounting channel (14) away from the central axis of the housing (1). Each end of each third flow channel (173) is connected to one of the first flow channels (171). A stator mounting channel (14) is provided between two adjacent third flow channels (173), that is, adjacent third flow channels (173) and second flow channels (172) are staggered. The housing (1) is provided with an inlet channel (21) and an outlet channel (22), wherein two adjacent first channels (171) are respectively connected to the inlet channel (21) and the outlet channel (22).

4. The high-torque axial magnetic field motor according to claim 1, characterized in that: The housing (1) is provided with a plurality of second air ducts (11), which are arranged around the center line of the housing (1). The upper part of the second air duct (11) is located between the outer wall of the housing (1) and the outer ring side wall of the upper annular receiving groove (12), and the lower part of the second air duct (11) is located between the outer wall of the housing (1) and the outer ring side wall of the lower annular receiving groove (13). The lower cover (9) is provided with a plurality of third air ducts (91). The exhaust end of the third air duct (91) is located near the central axis of the lower cover (9) and extends to the side of the lower cover (9) away from the stator body (4). The air inlet end of the third air duct (91) is located near the outer peripheral surface of the upper cover (7) and extends to the side of the upper cover (7) facing the stator body (4).

5. The high-torque axial magnetic field motor according to claim 4, characterized in that: The upper cover (7) is provided with a plurality of air guides (72) on the side away from the stator body (4). The air guides (72) correspond one-to-one with the first air duct (71). The air guides (72) are provided near the air inlet end of the corresponding first air duct (71). The air guide vane (72) is inclined, and the inclination direction of the air guide vane (72) is the same as the inclination direction of the rotor blade. The air guide vane (72) gradually narrows to a point in the direction away from the central axis of the upper cover (7).

6. The high-torque axial magnetic field motor according to claim 1, characterized in that: The upper rotor group (81) and the lower rotor group (82) have the same structure. The upper rotor group (81) includes several arrays of magnets (83) arranged in a radial direction. The adjacent arrays of magnets (83) are attached to each other. Each array of magnets (83) is formed by several arc-shaped magnets (83) with the same curvature spliced ​​in a circumferential direction. The arc-shaped magnets (83) are magnetized and arranged according to the Heilbeck array.

7. The high-torque axial magnetic field motor according to claim 4, characterized in that: The upper annular receiving groove (12) and the lower annular receiving groove (13) are both arranged around the rotating shaft mounting channel (15). A first annular protrusion (16) is provided in the rotating shaft mounting channel (15). A first annular slot (151) is opened at the bottom of the rotating shaft mounting channel (15). A first annular gasket (65) is provided in the first annular slot (151). The outer rotating bushing (62) is fitted with a supporting annular sleeve (63). The bottom of the outer rotating bushing (62) is provided with a second annular groove (621). A second annular gasket (66) is provided in the second annular groove (621). The top of the first annular protrusion (16) and the top of the second annular gasket (66) jointly support the first bearing (61). The first annular gasket (65), the second annular gasket (66), the supporting annular sleeve (63) and the first annular protrusion (16) jointly abut against the second bearing (64). The upper cover (7), the outer rotating bushing (62) and the first bearing (61) are interconnected. The outer rotating bushing (62) is provided with a second annular protrusion (622), and the top of the outer rotating bushing (62) is provided with a third annular groove (623), and a third annular gasket (67) is provided in the third annular groove (623). The inner rotating shaft (69) has a first annular stepped groove (691) at its top and a second annular stepped groove (692) at its bottom. The inner rotating shaft (69) is threaded with a clamping nut (611) at its top. The clamping nut (611), the third annular washer (67), the second annular protrusion (622), and the first annular stepped groove (691) together abut against a third bearing (68). The second annular protrusion (622) and the second annular stepped groove (692) together abut against a fourth bearing (610). The lower cover (9) is connected to the inner rotating shaft (69).

8. The high-torque axial magnetic field motor according to claim 7, characterized in that: The outer rotating bushing (62) is provided with an air guide annular plate (95) along its inner wall. The air guide annular plate (95) covers the third bearing (68) and guides the airflow into the main air inlet duct (693).

9. The high-torque axial magnetic field motor according to claim 3, characterized in that: The liquid cooling channel (17) further includes several fourth flow channels (174), several fifth flow channels (175) and several sixth flow channels (176), wherein the fourth flow channels (174) correspond one-to-one with the first flow channel (171) and are arranged opposite to each other; Several fifth flow channels (175) are equidistantly distributed around the central axis of the housing (1). Each of the five fifth flow channels (175) is connected at both ends to one end of a fourth flow channel (174) near the central axis of the housing (1). The fifth flow channels (175) are staggered from the second flow channel (172). Several sixth flow channels (176) are equidistantly distributed around the central axis of the housing (1). Each of the six sixth flow channels (176) is connected at both ends to a fourth flow channel (174) at the end away from the central axis of the housing (1), and the sixth flow channels (176) are staggered from the third flow channels (173). One of the two adjacent sixth channels (176) is connected to the liquid inlet channel (21) and the liquid outlet channel (22), respectively.

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