EVTOL motor arm structure

Abstract

The utility model discloses an eVTOL motor arm structure which comprises a motor arm, a motor is installed on the motor arm, the motor arm comprises a motor arm body and a wind cone, the wind cone is installed at the front end of the motor arm body, the motor arm body comprises an upper skin, a lower skin is connected below the upper skin, the front ends of the upper skin and the lower skin are connected with a motor base, and the rear ends of the upper skin and the lower skin are connected with end sealing ribs. The end sealing ribs, the lower skin, the motor base and the upper skin form a battery cabin, a battery is installed in the battery cabin, a cooling pipe is installed at the bottom of the lower skin and connected with a motor, and the motor is connected with the battery through a wire harness. According to the structure, the cruising resistance is small, the motor is wrapped in the motor arm structure, no sharp edge exists in the eVTOL forward flight cruising stage, and the resistance is small; and the cooling pipe is arranged outside the lower skin and is separated from the battery in the motor arm body, so that when liquid in the cooling pipe leaks, the liquid cannot intrude into the battery, the short circuit of the battery is prevented, and the power supply safety of the battery is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation equipment, and in particular to an eVTOL motor arm structure. Background Art

[0002] The development of eVTOL (Electric Vertical Takeoff and Landing) electric vertical takeoff and landing aircraft has attracted widespread attention from aerospace companies, the automotive industry, the transportation industry, the government, the military, and academia. Aircraft that rely on electric motors rather than internal combustion engines use electric propulsion systems instead of internal combustion engine power, thereby gaining many advantages and unique qualities. The most prominent advantages are energy saving and environmental protection, high efficiency and low energy consumption, while achieving near-zero emissions, very low noise and vibration levels, and good ride comfort. It is a truly environmentally friendly aircraft. In addition, it is also safe and reliable (no explosion and fuel leakage), simple structure, easy operation and use, good maintainability / low cost, and good economy. There are also many advantages in design: the overall layout is flexible, the optimal layout and unconventional / innovative layout can be adopted; aircraft with extraordinary performance can be designed to meet special purpose needs, etc.

[0003] The motor arm bears the force generated by the motor driving the propeller to rotate. For high-power motors, more heat is generated during operation and needs to be dissipated. Common heat dissipation methods include air cooling and water cooling. However, conventional air cooling has poor heat dissipation efficiency and cannot be used on high-power motors; and the aerodynamic surface of the protruding structure on the upper surface of the motor has a large aerodynamic resistance when flying forward, such as patent 202110400262.7 (a strut and aircraft for installing a rotor). When the existing water-cooled heat dissipation system is in use, there is a risk of coolant leakage and immersion in the battery; at the same time, high-power motors use thicker power harnesses, and existing aircraft often place the battery and motor farther apart, which increases the weight of the power harness. Utility Model Content

[0004] The purpose of the utility model is to provide an eVTOL motor arm structure to solve the problems mentioned in the background technology. To achieve the above purpose, the utility model provides the following technical solutions: an eVTOL motor arm structure, including a motor arm, a motor is installed on the motor arm, the motor arm includes a motor arm body and a wind cone, the wind cone is installed at the front end of the motor arm body, the motor arm body includes an upper skin, the lower skin is connected to the lower skin below the upper skin, the upper skin and the lower skin are connected to the motor seat at the front end, and the end ribs are connected to the end ribs at the rear end, the end ribs, the lower skin, the motor seat, and the upper skin constitute a battery compartment, and the battery compartment is installed with a battery, the upper skin has a motor mounting hole on the top, and the position of the motor mounting hole corresponds to the position of the motor seat, the lower skin has a cooling pipe installed at the bottom, the motor is located inside the motor mounting hole, and the bottom is installed on the motor seat, the cooling pipe is connected to the motor, and the motor is connected to the battery through a wiring harness.

[0005] Preferably, protrusions are provided on both sides of the bottom of the lower skin, the outside of the protrusions is connected with angle bars, a cooling pipe installation cavity is formed between the angle bars and the protrusions, and the cooling pipe is installed inside the cooling pipe installation cavity.

[0006] Preferably, an open channel is provided at the end of the motor seat.

[0007] Preferably, notches are provided at the front ends of both sides of the bottom of the lower skin, and the notches are located below the motor seat.

[0008] Preferably, a wiring harness hole is opened at the bottom of the motor seat, and a cooling pipe hole is opened on one side of the wiring harness hole.

[0009] Preferably, the upper skin, end ribs, lower skin and angle bars are made of carbon fiber composite materials.

[0010] Preferably, the angle bar is connected to the lower skin by structural adhesive.

[0011] The technical effects and advantages of the utility model are as follows: the structure has low cruising resistance: the motor is wrapped inside the motor arm structure, and during the eVTOL forward flight cruising stage, there are no sharp edges and the resistance is small;

[0012] High safety: The cooling pipe is arranged outside the lower skin and separated from the battery inside the motor arm body. When the liquid inside the cooling pipe leaks, it will not invade the battery, preventing the battery from short circuiting and ensuring the safety of the battery power supply;

[0013] Good heat dissipation effect: The water inlet and outlet pipes of the cooling pipe pass through the two sides of the motor arm body respectively, preventing the heated liquid inside the outlet pipe from exchanging heat with the liquid in the inlet pipe, thereby improving the heat dissipation efficiency of the motor;

[0014] Lightweight structure: The battery and motor are arranged together, saving the weight of the high-voltage wiring harness and making it lighter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an axonometric drawing of the utility model;

[0016] Figure 2 It is an exploded view of the utility model;

[0017] Figure 3 It is an exploded view of the motor arm body of the utility model;

[0018] Figure 4 It is an axonometric view of the lower skin of the utility model;

[0019] Figure 5 It is a cross-sectional view of the motor arm body of the utility model at the location of the battery;

[0020] Figure 6 It is a partial cross-sectional view of the motor arm body of the utility model at the location of the cooling pipe;

[0021] Figure 7 It is a partial cross-sectional view of the motor arm body of the utility model at a position without a cooling pipe.

[0022] In the figure, 1. motor arm; 11. motor arm body; 111. end rib; 112. lower skin; 1121. notch; 1122. protrusion; 113. motor seat; 114. upper skin; 115. angle material; 116. battery; 117. cooling pipe; 118. wiring harness hole; 119. cooling duct hole; 12. wind cone; 1131. wiring harness hole; 1132. cooling duct hole; 1141. motor mounting hole; 2. motor. DETAILED DESCRIPTION

[0023] In order to make the technical means for realizing the utility model, creative features, objectives and effects easy to understand, the utility model is further explained below in conjunction with specific diagrams. In the description of the utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection or a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two components.

[0024] Example

[0025] like Figure 1 , Figure 2As shown, the utility model provides an eVTOL motor arm structure including a motor arm 1 and a motor 2 mounted thereon, wherein the motor arm 1 includes a motor arm body 11 and a wind cone 12, and the wind cone 12 is mounted at the front end of the motor arm body 11. The motor 2 is a water-cooled motor, which dissipates heat through a coolant to meet the use requirements of the motor 2, and the rotation of the motor 2 drives the propeller to generate power to meet the power requirements of the eVTOL aircraft.

[0026] The motor arm body 11 is the main force-bearing component, and it also meets the installation requirements of the internal battery and the motor. The motor 2 is installed inside the motor arm body 11 and is surrounded by the motor arm body 11, which reduces the wind resistance of the motor 2. The wind cone 12 has a rectifying function. When the eVTOL aircraft flies forward, the wind cone 12 has the function of rectifying and reducing resistance. At the same time, the wind cone 12 is a detachable structure and is used as a cover. When installing the motor 2, the wind cone 12 is removed, and the motor 2 is disassembled and installed through the opening on the motor seat 113 as a tool space.

[0027] like Figure 3 As shown, the motor arm body 11 includes an end-sealing rib 111, a lower skin 112, a motor seat 113, an upper skin 114, an angle bar 115, a battery 116 and a cooling pipe 117. The lower skin 112 is connected to the upper skin 114 below, the upper skin 114 and the lower skin 112 are connected to the motor seat 113 at the front end, and the end-sealing rib 111 is connected to the rear end. The battery 116 provides power for the eVTOL aircraft, and the battery 116 is arranged inside the motor arm body 11. The end-sealing rib 111, the lower skin 112, the motor seat 113, and the upper skin 114 are combined into a battery compartment, and the battery 116 is installed inside the battery compartment, which protects the internal battery 116 from external extrusion, water overflow, and other hazards. The upper skin 114 has a motor mounting hole 1141 at the top, and the position of the motor mounting hole 1141 corresponds to the position of the motor seat 113. The motor 2 is located inside the motor mounting hole 1141, and the bottom is mounted on the motor seat 113. The motor seat 113 has a harness hole 1131, and the harness connects the battery 116 and the motor 2 through the harness hole 1131. The upper skin 114 and the lower skin 112 constitute the main outer surface of the motor arm body 11, maintaining the aerodynamic shape, and also participate in bearing, bearing the tension generated by the motor 2. The upper skin 114 and the lower skin 112 can be made of aluminum alloy or carbon fiber composite material, preferably carbon fiber composite material. The upper skin 114 and the lower skin 112 are connected by structural adhesive or fasteners. When the structural adhesive is used for connection, it is difficult to disassemble when the internal battery needs to be repaired, but the structure is light; when the fasteners are used for connection, it is convenient for maintenance, but the structure is heavy.

[0028] The end rib 111 seals the battery compartment and also supports the upper skin 114 and the lower skin 112 to prevent the upper skin 114 and the lower skin 112 from buckling when subjected to stress. The end rib 111 can be made of aluminum alloy or carbon fiber composite material. In this example, carbon fiber composite material is used. The motor seat 113 bears the load generated by the motor 2 and meets the installation requirements of the motor 2. At the same time, the motor seat 113 also supports the upper skin 114 and the lower skin 112 to prevent the upper skin 114 and the lower skin 112 from buckling when subjected to stress. An opening channel is provided at the end of the motor seat 113 to provide installation and maintenance for the motor 2.

[0029] The angle bar 115 is arranged at the two side corners of the bottom of the motor arm 1, connected to the outside of the lower skin 112, and forms a cooling pipe installation cavity with the lower skin 112 for the cooling pipe 117 to pass through. The angle bar 115 can be made of aluminum alloy or carbon fiber composite material, and carbon fiber composite material is preferably used.

[0030] The cooling pipe 117 is connected to the motor 2 and is a passage for the coolant of the motor 2. There are two cooling pipes, one for the water inlet pipe and the other for the water outlet pipe. The coolant with a lower temperature enters the motor 2 through the water inlet pipe, completes heat exchange inside the motor 2, cools the motor 2, and the coolant temperature rises and flows out to the water outlet pipe to the inside of the radiator. The cooling pipe 117 can be a plastic pipe or an aluminum pipe, and in this example, it is an aluminum pipe.

[0031] like Figure 4 As shown, the lower skin 112 is provided with a protrusion 1122 at the corner, and the protrusion 1122 is only in the battery compartment area, isolating the space between the cooling pipe 117 and the battery 116 to prevent the liquid in the cooling pipe 117 from leaking into the battery compartment; in the bottom area of ​​the motor base 113, the protrusion 1122 is cut off to form a notch 1121, and a cooling pipe hole 1132 is opened on the motor base 113, so that the cooling pipe 117 enclosed between the angle material 115 and the protrusion 1122 of the lower skin 112 can extend from the notch 1121 and the cooling pipe hole 1132 to be connected to the water inlet and outlet on the motor 2, so as to achieve cooling of the motor 2, even if the liquid in the cooling pipe 117 leaks in this area, the closed area formed by the motor base 113 and the skin will prevent the liquid from flowing from the end into the battery compartment.

[0032] like Figure 5 As shown, the upper skin 114 and the lower skin 112 surround the battery 116 in the middle, and the closed cavity formed by the protrusion 1122 of the lower skin 112 and the angle material 115 serves as a channel for the cooling pipe 117, completely isolating the cooling pipe 117 outside the lower skin 112.

[0033] like Figure 6 and Figure 7As shown, in the battery compartment area, the angle material 115 and the lower skin 112 are connected with structural adhesive at the protrusion 1122. In the non-battery compartment area, the angle material 115 is glued to the edge of the notch 1121 of the lower skin 112, forming the structural integrity of the motor arm body 11 and the continuity of the internal structure, which has better stress characteristics.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An eVTOL motor arm structure, comprising a motor arm, characterized in that: A motor is installed on the motor arm, and the motor arm includes a motor arm body and a wind cone, and the wind cone is installed at the front end of the motor arm body. The motor arm body includes an upper skin, and the lower skin is connected to the upper skin below. The upper and lower skins are connected to the motor seat at the front ends and connected to the end-sealing ribs at the rear ends. The end-sealing ribs, the lower skin, the motor seat, and the upper skin constitute a battery compartment, and batteries are installed inside the battery compartment. A motor mounting hole is opened on the top of the upper skin, and the position of the motor mounting hole corresponds to the position of the motor seat. A cooling pipe is installed at the bottom of the lower skin, and the motor is located inside the motor mounting hole, and the bottom is installed on the motor seat. The cooling pipe is connected to the motor, and the motor is connected to the battery through a wiring harness.

2. The eVTOL motor arm structure according to claim 1, characterized in that: Protrusions are provided on both sides of the bottom of the lower skin, and angle bars are connected to the outside of the protrusions. A cooling pipe installation cavity is formed between the angle bars and the protrusions, and the cooling pipe is installed inside the cooling pipe installation cavity.

3. The eVTOL motor arm structure according to claim 1, characterized in that: An open channel is provided at the end of the motor seat.

4. The eVTOL motor arm structure according to claim 2, characterized in that: Notches are provided at the front ends of both sides of the bottom of the lower skin, and the notches are located below the motor seat.

5. The eVTOL motor arm structure according to claim 2, characterized in that: A wiring harness hole is provided at the bottom of the motor seat, and a cooling pipe hole is provided on one side of the wiring harness hole.

6. The eVTOL motor arm structure according to claim 2, characterized in that: The upper skin, end ribs, lower skin and angle materials are made of carbon fiber composite materials.

7. The eVTOL motor arm structure according to claim 2, characterized in that: The angle material and the lower skin are connected by structural adhesive.

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