High-voltage motor-based hollow rotor structure with cooling fan

Abstract

The application relates to a high-voltage motor-based hollow-rotor structure with a cooling fan, which comprises a rotor support, the rotor support comprising a first connecting ring and a support rod, the support rod being arranged at the outer periphery of the first connecting ring and extending radially along the same, a plurality of support rods being arranged at intervals in the circumferential direction, and a fan-shaped airflow channel being formed between adjacent support rods; and a centrifugal fan coaxially arranged at the axial side of the rotor support, the centrifugal fan comprising a first annular fan surface and a second annular fan surface, the second annular fan surface being arranged at the outer ring side of the first annular fan surface, and the two being arranged at intervals in the axial direction and being connected through a plurality of blades uniformly distributed in the circumferential direction; wherein the first annular fan surface is fixedly connected with the end surface of the rotor support, and one end of the blade extends radially inward to the corresponding area of the fan-shaped airflow channel. In the utility model, the blade directly acts on the airflow channel, forms forced directional airflow of the shortest path, and efficiently leads out the heat in the motor, and is particularly suitable for the hovering working condition of a drone.

Description

Technical Field

[0001] This application relates to the field of unmanned aerial vehicle (UAV) motor technology, and in particular to a hollow rotor structure with a cooling fan based on a high-voltage motor. Background Technology

[0002] With the rapid development of drone technology, the workload and power density of drones are constantly increasing, leading to a sharp increase in motor heat generation. Motors, especially their core components—the rotor and permanent magnets—are highly susceptible to irreversible demagnetization of the permanent magnets when operating at sustained high temperatures. This results in decreased motor efficiency and unstable torque output, severely restricting the performance and reliability of drones. This heat dissipation bottleneck is particularly pronounced when drones are hovering or flying at low speeds, as sufficient airflow is lacking, making traditional cooling solutions relying on natural wind extremely inefficient.

[0003] To address these issues, the mainstream solution in the industry is to add an independent cooling fan to the motor rotor. These fans are typically made of hard plastics such as ABS and nylon, or metal. However, this approach has several inherent drawbacks: First, there's the issue of weight and rotational inertia: the independent rigid fan itself is significantly heavier, and its installation greatly increases the overall weight and rotational inertia of the rotor. This not only undermines the drone's pursuit of lightweight design but also reduces the motor's dynamic response speed, impairing the drone's maneuverability and endurance.

[0004] Secondly, there are issues related to vibration, noise, and efficiency: Rigid fans are prone to vibration coupling with the rotor body when rotating at high speeds, amplifying operating noise and placing extremely high demands on dynamic balance, thus increasing manufacturing and assembly costs. Furthermore, the inevitable machining and assembly gaps at the fan-rotor mating surface cause leakage of high-pressure cooling airflow, significantly reducing actual heat dissipation efficiency.

[0005] Secondly, there are safety and reliability issues: In extreme situations such as drone collisions (e.g., "crashing"), rigid fans are prone to breakage due to their material properties, generating high-speed flying debris that poses a safety hazard to the drone itself and the surrounding environment.

[0006] In summary, most existing heat dissipation solutions are simply a combination of functions rather than an integrated and collaborative design. While solving the heat dissipation problem, they often introduce new negative issues such as weight, inertia, vibration, noise, and safety. Utility Model Content

[0007] Therefore, it is necessary to provide a hollow rotor structure with a cooling fan based on a high-voltage motor to overcome the defects mentioned in the background art.

[0008] A hollow rotor structure with cooling fan based on a high-voltage motor includes... A rotor support, comprising a first connecting ring and a support rod, wherein the support rod is disposed on the outer periphery of the first connecting ring and extends radially therefrom, and a plurality of the support rods are spaced apart along the circumferential direction, forming a fan-shaped airflow channel between adjacent support rods; A centrifugal fan is coaxially mounted on one side of the rotor support. The centrifugal fan includes a first annular fan surface and a second annular fan surface. The second annular fan surface is arranged on the outer ring side of the first annular fan surface, and the two are spaced apart along the axial direction and connected by a plurality of blades evenly distributed in the circumferential direction. The first annular fan-shaped blade is fixedly connected to the end face of the rotor support, the second annular fan-shaped blade is sleeved with the rotor support, and one end of the blade extends radially inward to the corresponding area of ​​the fan-shaped airflow channel.

[0009] As a preferred embodiment of the hollow rotor structure with cooling fan based on high-voltage motor in this utility model, the rotor support further includes a second connecting ring, the top end of which is connected to the end of the support rod, and the bottom end of which extends into the housing.

[0010] As a preferred embodiment of the hollow rotor structure with cooling fan based on high-voltage motor in this utility model, the bottom end of the second connecting ring is provided with magnetic tile fixing grooves spaced apart along the circumferential direction.

[0011] As a preferred embodiment of the hollow rotor structure with cooling fan based on high-voltage motor in this utility model, the support rod is provided with a weight reduction groove along its axial direction.

[0012] As a preferred embodiment of the hollow rotor structure with cooling fan based on high-voltage motor in this utility model, the centrifugal fan is integrally injection molded from flexible material.

[0013] As a preferred embodiment of the hollow rotor structure with cooling fan based on high-voltage motor in this utility model, the outer diameter of the first annular fan surface is larger than the outer diameter of the second connecting ring, the inner diameter of the second annular fan surface is equal to the outer diameter of the second connecting ring, and its outer diameter is equal to the outer diameter of the first annular fan surface.

[0014] As a preferred embodiment of the hollow rotor structure with cooling fan based on high-voltage motor in this utility model, the first annular fan surface is detachably connected to the rotor support by fasteners.

[0015] The beneficial effects of this utility model are: The blades in this invention act directly on the airflow channel, forming a forced, shortest-path directional airflow that efficiently dissipates heat from inside the motor. This is particularly suitable for drone hovering conditions. The hollowed-out design and weight-reducing grooves of the rotor bracket significantly reduce weight and rotational inertia, improving the drone's maneuverability and endurance. The flexible centrifugal fan is not easily broken upon impact, eliminating the risk of flying debris, ensuring high safety, and facilitating maintenance and replacement. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the hollow rotor structure according to an embodiment of this application; Figure 2 This is an exploded structural diagram of the hollow rotor structure according to an embodiment of this application; Figure 3 This is a schematic diagram of the overall structure of the rotor support according to an embodiment of this application; Figure 4 This is a schematic diagram of the overall structure of the centrifugal fan according to an embodiment of this application. Explanation of reference numerals in the attached figures: 1000, Rotor support; 1100, First connecting ring; 1200, Support rod; 1300, Second connecting ring; 1400, Magnet tile fixing groove; 1500, Weight reduction groove; 1600, Mounting countersunk hole; 1700, Mounting hole; 2000 Centrifugal fan; 2100 First annular fan blade; 2200 Second annular fan blade; 2300 Blade; 2400 Mounting boss; 2500 Mounting through hole; 3000, casing; 4000, Fasteners. Detailed Implementation

[0018] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0019] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0024] According to one aspect of this application, embodiments of this application provide a hollowed-out rotor structure with a cooling fan based on a high-voltage motor, please refer to the following: Figures 1 to 4 The hollow rotor structure with cooling fan based on a high-voltage motor includes a rotor support 1000, a centrifugal fan 2000, a housing 3000, and fasteners 4000. The rotor support 1000 is mounted on top of the housing 3000 and internally sleeved with the rotating shaft. The rotor support 1000 includes a first connecting ring 1100 and support rods 1200. The support rods 1200 are disposed on the outer periphery of the first connecting ring 1100 and extend radially thereafter. Multiple support rods 1200 are spaced apart in the circumferential direction, forming a fan-shaped airflow channel between adjacent support rods 1200. The centrifugal fan 2000 is coaxially disposed on the housing 3000. On one axial side of the rotor support 1000, the centrifugal fan 2000 includes a first annular fan surface 2100 and a second annular fan surface 2200. The second annular fan surface 2200 is arranged on the outer ring side of the first annular fan surface 2100, and the two are spaced apart along the axial direction and connected by a plurality of blades 2300 evenly distributed in the circumferential direction. The first annular fan surface 2100 is fixedly connected to the end face of the rotor support 1000 by fasteners 4000. The second annular fan surface 2200 is sleeved on the rotor support 1000. One end of the blade 2300 extends radially inward to the corresponding area of ​​the fan-shaped airflow channel.

[0025] In this embodiment, the hollow rotor structure with cooling fan based on a high-voltage motor includes a rotor support 1000, a centrifugal fan 2000, a housing 3000, and fasteners 4000. The rotor support 1000, centrifugal fan 2000, and housing 3000 are coaxially arranged. The rotor support 1000 and centrifugal fan 2000 are installed on the same side of the housing 3000. The rotor support 1000 and centrifugal fan 2000, and the rotor support 1000 and housing 3000 are connected by fasteners 4000. By integrating the rotor support 1000 and centrifugal fan 2000 on the housing 3000, the airflow channel is optimized, creating an efficient and forced convection heat dissipation path inside the motor. Under harsh heat dissipation conditions such as drone hovering or low-speed flight, it can actively drive the cooling airflow, directly and effectively reducing the operating temperature of the stator windings and permanent magnets. This fundamentally eliminates the risk of demagnetization of permanent magnets due to high temperatures, significantly improving the power density, operating efficiency, and long-term reliability of the motor.

[0026] In one embodiment, see Figure 2 and Figure 3 As shown, the rotor support 1000 includes a first connecting ring 1100, a support rod 1200, and a second connecting ring 1300. The first connecting ring 1100 is used to connect with the motor shaft. The first connecting ring 1100 and the second connecting ring 1300 are arranged coaxially. The support rod 1200 is disposed between the two, with one end connected to the outer periphery of the first connecting ring 1100 and the other end connected to the top of the second connecting ring 1300. Multiple support rods 1200 are arranged in a circumferential shape and located in the same plane. A fan-shaped airflow channel is formed between adjacent support rods 1200 to allow the airflow passing through the motor to dissipate. The second connecting ring 1300 is stepped. Its lower outer diameter is the same as the inner diameter of the housing 3000. It is inserted into the housing 3000 and connected to it by fasteners 4000. Its upper outer diameter is the same as the outer diameter of the housing 3000.

[0027] In one embodiment, see Figure 2 and Figure 3 As shown, the bottom end of the second connecting ring 1300 is provided with magnetic tile fixing grooves 1400 spaced along the circumferential direction. This structure is used to embed permanent magnets, thereby forming the magnetic circuit of the motor rotor. No additional fixing structure is required, so as to reduce the weight of the motor.

[0028] In one embodiment, see Figure 2 and Figure 3 As shown, the strut 1200 is provided with a weight reduction groove 1500 along its axial direction to further meet the requirements of lightweighting.

[0029] In one embodiment, see Figure 2 and Figure 3 As shown, a mounting countersunk hole 1600 is provided at the end of a portion of the support rod 1200, and a mounting hole 1700 is provided inside the mounting countersunk hole 1600 and on the top surface of the first connecting ring 1100.

[0030] In one embodiment, the centrifugal fan 2000 is integrally injection molded from a flexible material. Replacing traditional metal or heavy-duty hard plastic fans with lightweight engineering plastics or flexible materials not only increases heat dissipation but also reduces the overall structural weight. Furthermore, it significantly reduces the rotor's moment of inertia, directly improving the UAV's maneuverability, dynamic response speed, and endurance. This achieves a synergistic win-win situation for both heat dissipation and weight reduction. The centrifugal fan 2000, made of flexible materials, can undergo elastic deformation rather than shatter upon collision with the UAV, thus buffering energy absorption and completely avoiding the safety hazards of high-speed debris. Even if the fan fails in extreme situations, its modular design facilitates quick disassembly and replacement, greatly improving the system's maintainability and overall reliability.

[0031] In one embodiment, see Figure 2 and Figure 4 As shown, the outer diameter of the first annular fan 2100 is greater than the outer diameter of the second connecting ring 1300, the inner diameter of the second annular fan 2200 is equal to the outer diameter of the second connecting ring 1300, and its outer diameter is equal to the outer diameter of the first annular fan 2100, so as to realize the connection between the centrifugal fan 2000 and the rotor support 1000.

[0032] In one embodiment, see Figure 1 , Figure 2 and Figure 4 As shown, a mounting through hole 2500 is provided at the position corresponding to the mounting hole 1700 of the first annular fan surface 2100, and a mounting boss 2400 matching the mounting through hole 2500 is also provided on the connecting surface of the first annular fan surface 2100 and the rotor support 1000.

[0033] During assembly, the centrifugal fan 2000 is placed above the rotor support 1000, with the inner wall of the second annular fan surface 2200 fitting against the outer wall of the second connecting ring 1300. Then, fasteners 4000 are passed through the mounting holes 2500 on the first annular fan surface 2100 and securely connected to the top surface of the support rod 1200, achieving detachable fixing of the centrifugal fan 2000 and the rotor support 1000. In this state, the tips of the blades 2300 extend radially inward to the upper region of the fan-shaped airflow channel. The tight fit between the centrifugal fan 2000 and the rotor support 1000 eliminates the assembly gap between a traditional independent fan and rotor. This structure effectively avoids airflow leakage and vibration coupling under high-speed rotation, thereby significantly reducing motor operating noise and vibration amplitude, improving the stability of the downstream flight control system, and reducing the stringent requirements for component dynamic balance.

[0034] Working principle: When the motor drives the rotor structure to rotate, the hot air generated inside the motor is drawn upward by centrifugal force through the blade washout channel. The blades 2300 are directly opposite this airflow channel, forcing the air to be thrown out radially at high speed from the annular outlet between the first annular fan surface 2100 and the second annular fan surface 2200. This process forms a forced, continuous cooling airflow with the shortest path, continuously and efficiently dissipating heat from the core components of the motor.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A hollow rotor structure with a cooling fan based on a high-voltage motor, characterized in that: include A rotor support, comprising a first connecting ring and a support rod, wherein the support rod is disposed on the outer periphery of the first connecting ring and extends radially therefrom, and a plurality of the support rods are spaced apart along the circumferential direction, forming a fan-shaped airflow channel between adjacent support rods; A centrifugal fan is coaxially mounted on one side of the rotor support. The centrifugal fan includes a first annular fan surface and a second annular fan surface. The second annular fan surface is arranged on the outer ring side of the first annular fan surface, and the two are spaced apart along the axial direction and connected by a plurality of blades evenly distributed in the circumferential direction. The first annular fan-shaped blade is fixedly connected to the end face of the rotor support, the second annular fan-shaped blade is sleeved with the rotor support, and one end of the blade extends radially inward to the corresponding area of ​​the fan-shaped airflow channel.

2. The hollow rotor structure with cooling fan based on a high-voltage motor according to claim 1, characterized in that, The rotor support also includes a second connecting ring, the top end of which is connected to the end of the support rod, and the bottom end of which extends into the housing.

3. The hollow rotor structure with cooling fan based on a high-voltage motor according to claim 2, characterized in that, The bottom end of the second connecting ring is provided with magnetic tile fixing grooves spaced apart along the circumferential direction.

4. The hollow rotor structure with cooling fan based on a high-voltage motor according to claim 2, characterized in that, The support rod is provided with a weight-reducing groove along its axial direction.

5. The hollow rotor structure with cooling fan based on a high-voltage motor according to claim 1, characterized in that, The centrifugal fan is integrally injection molded from a flexible material.

6. The hollow rotor structure with cooling fan based on a high-voltage motor according to claim 1, characterized in that, The outer diameter of the first annular fan is greater than the outer diameter of the second connecting ring, the inner diameter of the second annular fan is equal to the outer diameter of the second connecting ring, and its outer diameter is equal to the outer diameter of the first annular fan.

7. The hollow rotor structure with cooling fan based on a high-voltage motor according to claim 6, characterized in that, The first annular sector is detachably connected to the rotor support by fasteners.

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