Coaxial twin propeller motor for use on sea surface flying buoy

Abstract

The utility model discloses a kind of coaxial double-paddle motors used on sea surface flying buoy, including the motor group constructed by first motor, second motor, the first motor, second motor corresponding output shaft is coaxially reversely arranged, to drive two groups of propellers reversely rotating respectively, construct water or underwater propulsion coaxial double-paddle type drive structure, the rotor assembly and magnetic steel surface of the first motor, second motor are all provided with the corrosion-proof layer of electroplated nickel, the stator core surface of the first motor, second motor is all provided with the protective layer of vacuum plating film;The oil injection port is opened on the oil injection inner cavity side wall corresponding to the motor group, and the oil injection port is connected with oil injection device by matched connecting pipeline.The utility model is by being provided with corrosion-proof layer on the rotor assembly and magnetic steel surface of each motor, and being provided with protective layer on stator core surface, so that it is more resistant to seawater corrosion relative to existing ordinary motor, and service life is more guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) design technology. More specifically, this utility model relates to a coaxial dual-propeller motor used on a sea surface buoy. Background Technology

[0002] Coaxial dual-rotor technology is a special rotor layout used in helicopters in the aerospace field, in which the upper and lower rotors rotate in opposite directions around the same axis, and torque balance and directional control are achieved through total torque differential.

[0003] When coaxial dual-rotor technology is used in drones, it typically employs two separate motors, one above the other, or two motors arranged back-to-back. Alternatively, a single motor may rotate in opposite directions via a complex steering mechanism, resulting in a relatively high overall height for the drone. Therefore, controlling the overall height of the coaxial dual-rotor dual-motor system is a major technical hurdle for its application in drones. Existing technologies have proposed numerous solutions to address this issue, such as the thin motor and coaxial dual-rotor drone using patent number CN202410602422.X, which strengthens the shell by incorporating a mid-section partition component within the shell. The strength and magnetic field of the body are isolated to avoid mutual interference between the magnetic fields of the upper and lower drive units. The thin motor is applied to coaxial dual-rotor aircraft. When it is applied to coaxial dual-rotor UAVs, compared with the traditional upper and lower dual-motor structure, the thickness of the power part can be greatly reduced, thereby reducing the overall height of the coaxial dual-rotor UAV. Although this technology can effectively apply coaxial dual-rotor technology to UAVs, when this technology is applied to sea surface flying buoys, it also shows other disadvantages: such as insufficient corrosion resistance of coaxial dual-rotor motors used at sea, easy to seep into seawater due to pressure imbalance, and salt ion crystallization will damage the equipment, resulting in a shortened equipment life. Utility Model Content

[0004] One object of this invention is to solve the above-mentioned problems and / or defects, and to provide the advantages that will be described later.

[0005] To achieve these objectives and other advantages of this utility model, a coaxial dual-propeller motor for use on a sea surface buoy is provided, comprising a motor assembly consisting of a first motor and a second motor. The output shafts of the first motor and the second motor are coaxially arranged in opposite directions to drive two sets of propellers to rotate in opposite directions, thereby constructing a coaxial dual-propeller drive structure for propulsion on or underwater. The rotor assemblies and magnet surfaces of the first motor and the second motor are provided with an electroplated nickel anti-corrosion layer, and the stator core surfaces of the first motor and the second motor are provided with a vacuum-plated protective layer. An oil inlet is provided on the side wall of the oil filling cavity corresponding to the motor unit, and the oil inlet is connected to an external oil filling device through a matching connecting pipe.

[0006] Preferably, the first motor and the second motor are configured to be external rotor permanent magnet motors of the same specifications; The first motor and the second motor are connected to the motor base as an integral structure through corresponding bearings.

[0007] Preferably, each motor housing is provided with multiple flushing windows, which are spatially aligned with the rotor assembly to flush the gap between the rotor and stator using fresh water.

[0008] Preferably, the rotor assembly of the first motor and the second motor has an outer diameter of 155mm, and the rotor is provided with 30-pole magnets; The stator assembly in the first motor and the second motor has a diameter of 140mm, an axial height of 30mm, and 36 slots in the stator core. The axial height of each motor is 87.5mm, and the total axial height of the motor assembly after the first and second motors are assembled is 175mm. The height difference between the mounting planes of the two propellers is 18-20mm.

[0009] This utility model has at least the following beneficial effects: Firstly, by setting an anti-corrosion layer on the rotor assembly and magnet surface of each motor, and a protective layer on the stator core surface, this invention makes it more resistant to seawater corrosion and ensures a longer service life compared to existing ordinary motors. Secondly, this utility model sets an oil inlet for an external oil injection device on the oil injection cavity, and adjusts the amount of oil in the oil injection cavity by pumping in and out of the oil injection pump, thereby completing the function of adjusting the pressure of the oil injection cavity according to changes in the external environmental pressure, so that the internal pressure of the motor is always greater than the external environmental pressure. Thirdly, by limiting the parameters of the motor, this utility model makes its size and weight controllable, which is more conducive to lightweighting and miniaturization.

[0010] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0011] Figure 1 A cross-sectional view of a coaxial twin-propeller motor used on a sea surface buoy, as shown in one embodiment of the present invention. Figure 2 This is a schematic diagram of the overall structure of a coaxial twin-propeller motor used on a sea surface buoy, as shown in one embodiment of the present invention. Figure 3This is an enlarged structural diagram of the part where the oil inlet is located on the motor base in one embodiment of the present invention; Among them, 1-first motor, 2-second motor, 3-rotor assembly, 4-bearing, 5-oil inlet, 6-motor base, 7-oil inlet cavity, 8-stator coil assembly, 9-flushing window, 10-mounting base. Detailed Implementation

[0012] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0013] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0014] It should be noted that in the description of this utility model, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. It does 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 utility model.

[0015] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0016] Furthermore, in this utility model, unless otherwise explicitly 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. Moreover, "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.

[0017] Example 1 A coaxial twin-propeller motor used on sea surface buoys has the following structure: Figure 1-2As shown, it includes a motor group consisting of a first motor 1 and a second motor 2. The output shafts of the first motor 1 and the second motor 2 are coaxially arranged in opposite directions to drive the upper and lower propellers to rotate in opposite directions, thereby constructing a coaxial dual-propeller drive structure for propulsion on or underwater. It should be noted that the coaxially arranged opposite positions of the output shafts in the coaxial dual-propeller drive structure are existing technologies, so their connection relationship, working principle, etc. will not be described in further detail here. The first motor 1 and the second motor 2 are configured to use external rotor permanent magnet motors of the same specifications. After being connected to the motor base 6 through the bearing 4, their output shafts are set in opposite directions on the same axis, driving the upper and lower propellers to rotate in opposite directions respectively, in order to counteract the counter torque of the single propeller rotation and improve the stability of propulsion on or under water. The rotor assemblies 3 and magnet surfaces of the first motor 1 and the second motor 2 are all provided with an electroplated nickel anti-corrosion layer. The stator core surfaces of the first motor 1 and the second motor 2 (the stator core is wound to obtain the stator coil assembly 8, the principle and structure of which are existing technologies and will not be described in detail here) are all provided with a vacuum-plated protective layer (the protective layer is a titanium alloy coating). Since the first motor 1 and the second motor 2 are external rotor permanent magnet motors, by providing corresponding anti-corrosion layers (the anti-corrosion layer is electroplated nickel) and protective layers at the locations where the first motor 1 and the second motor 2 come into contact with seawater, the equipment will not be damaged by salt ion crystallization, thus ensuring the service life of the equipment. An oil inlet 5 is provided on the side wall of the oil filling cavity 7 corresponding to the motor set. The oil inlet 5 is connected to an external oil filling device (not shown) through a matching connecting pipe. In actual application, the oil filling cavity 7 is set in the motor base 6. Oil is injected into the oil filling cavity 7 through the oil filling hole set on the side of the motor oil filling cavity 7 by the external oil filling device, so that the pressure of the protective oil inside the cavity is always slightly greater than the external seawater pressure, so that the bearing is always wrapped with protective oil to avoid seawater corrosion. In actual application, the oil filling device is an oil pump, and the pressure of the oil filling cavity is regulated by the oil pump to achieve pressure balance control.

[0018] In addition, the motor base 6 is provided with multiple mounting seats 10 in the circumferential direction of the connecting section between the first motor 1 and the second motor 2 (each mounting seat is evenly distributed on the connecting section, and can be set to 3 or more as needed).

[0019] Working Principle: In this example, the internal oil filling chamber 7 of the motor is filled with protective oil. The amount of oil in the filling chamber is adjusted by the pumping operation of the oil pump, thereby achieving the function of adjusting the pressure of the filling chamber according to changes in the external environmental pressure, so that the internal pressure of the motor is always greater than the external environmental pressure. Furthermore, the pressure adjustment of the oil pump actually keeps the internal pressure of the motor slightly greater than the seawater pressure, thus forming a slight positive pressure protection, which can completely prevent seawater from seeping into the motor bearing cavity and internal winding cavity.

[0020] Example 2 This second embodiment is a preferred embodiment of the present invention, and its structure is as follows: Figure 2 As shown, it discloses the following improvements based on Example 1: Each motor housing is provided with multiple flushing windows 9, which are spatially aligned with the rotor assembly position to flush the gap between the rotor and stator with fresh water.

[0021] Working principle: By setting a flushing window 9 on the motor's casing, fresh water can be connected to flush the gap between the rotor and stator during maintenance, removing residual salt ions on the inner wall of the gap and in the gap itself, thus preventing salt crystallization that could cause wear and corrosion of the components.

[0022] Example 3 This embodiment 3 is a preferred embodiment of the present invention, and it discloses the following improvements based on embodiment 1: The outer diameter of the rotor assembly of each motor is 155mm, and the rotor is equipped with 30-pole magnets; The stator assembly of each motor has a diameter of 140mm, an axial height of 30mm, and 36 slots in the stator core. The axial height of a single motor is 87.5mm, which makes the total axial height of the whole machine 175mm after the first motor and the second motor are assembled. The height difference between the mounting planes of the two propellers is 18-20mm. After the two sets of propellers are installed, the weight of the whole machine is about 8.0kg. This example limits the parameters of each motor to control the size and weight of the equipment as much as possible while meeting the needs of the buoy, so as to achieve the design goal of compact structure and lightweight equipment.

[0023] The above solutions are merely illustrative examples of preferred embodiments, but are not limited thereto. When implementing this invention, appropriate substitutions and / or modifications can be made according to the user's needs.

[0024] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of this utility model will be readily apparent to those skilled in the art.

[0025] Although embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be readily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A coaxial dual-propeller motor for use on a sea-surface buoy, comprising a motor assembly consisting of a first motor and a second motor, wherein the output shafts of the first motor and the second motor are coaxially arranged in opposite directions to drive two sets of upper and lower propellers to rotate in opposite directions, thereby constructing a coaxial dual-propeller drive structure for propulsion on or underwater, characterized in that, The rotor assemblies and magnet surfaces of the first motor and the second motor are all provided with an electroplated nickel anti-corrosion layer, and the stator core surfaces of the first motor and the second motor are all provided with a vacuum-plated protective layer. An oil inlet is provided on the side wall of the oil filling cavity corresponding to the motor unit, and the oil inlet is connected to an external oil filling device through a matching connecting pipe.

2. The coaxial twin-propeller motor for use on sea surface buoys as described in claim 1, characterized in that, The first motor and the second motor are configured to be external rotor permanent magnet motors of the same specifications; The first motor and the second motor are connected to the motor base as an integral structure through corresponding bearings.

3. The coaxial twin-propeller motor for use on sea surface buoys as described in claim 1, characterized in that, Each motor housing is provided with multiple flushing windows, which are spatially aligned with the rotor assembly to flush the gap between the rotor and stator with fresh water.

4. The coaxial twin-propeller motor for use on sea surface buoys as described in claim 1, characterized in that, The rotor assemblies in the first and second motors have an outer diameter of 155mm, and the rotors are equipped with 30-pole magnets. The stator assembly in the first motor and the second motor has a diameter of 140mm, an axial height of 30mm, and 36 slots in the stator core. The axial height of each motor is 87.5mm, and the total axial height of the motor assembly after the first and second motors are assembled is 175mm. The height difference between the mounting planes of the two propellers is 18-20mm.

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