A Low-Drag Magnetic Levitation Platform for Thrust Measurement of Micropropellers
A micro-propeller, low-resistance technology, applied in the field of magnetic levitation, can solve the problems of high resistance and insufficient sensitivity, and achieve the effects of reducing resistance, improving sensitivity, and avoiding frictional resistance.
Active Publication Date: 2020-11-03
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
In order to solve the problem of excessive resistance and insufficient sensitivity of the existing micro propeller thrust measurement method, the present invention combines electromagnetic-permanent magnet technology to design a low-resistance magnetic levitation thrust measurement platform with self-stabilizing structure and reliable performance
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[0023] The present invention will be further described below in conjunction with the accompanying drawings and the specific implementation process.
[0024] see figure 1 , the load-bearing parts of sliding platform 1 and guide rail 2 adopt V-shaped design, and the reason for adopting V-shaped angle design of 150° is to ensure that the plumb direction has a large enough repulsive force to support the entire sliding platform 1 stably. Assuming that each The repulsive force of the V-shaped inclined plane is F. From the force analysis, it is easy to know that the force on the sliding platform 1 in the plumb direction is F*sin75°, and the force in the horizontal direction is F*cos75°. It can be seen that most of the repulsive force is uniform For providing the suspension of the sliding platform 1. When the sliding platform 1 is in the designed equilibrium position, the resultant force in the horizontal direction is exactly zero, and it is only supported by the vertical direction. ...
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The invention provides a low-resistance magnetic levitation platform for thrust measurement of a micro-thruster. The low-resistance magnetic levitation platform comprises a sliding platform, a guide rail, a foam baffle and a high-frequency response displacement sensor; a rectangular electromagnet is installed on the sliding platform; a ferrite permanent magnet is installed on the guide rail; the two are in V-shaped load-carrying structural design; stable levitation of the sliding platform is realized by utilization a principle that the same poles repel each other; in combination with an eddy current displacement sensor, the sliding track of the sliding platform is adjusted in real time; the micro-thruster and the high-frequency displacement sensor are fixed on the sliding platform; when the micro-thruster works to generate thrust, the sliding platform is driven to do one-dimensional linear sliding nearly close to zero resistance; simultaneously, the high-frequency response displacementsensor records displacement of the sliding platform in real time; and thus, the thrust of the micro-thruster is inversely calculated. By means of the low-resistance magnetic levitation platform for thrust measurement of the micro-thruster in the invention, the problem that the traditional thrust measurement method is too high in resistance or insufficient in system sensitivity can be overcome; the micro-thrust measurement precision is greatly increased; and the low-resistance magnetic levitation platform can be used in the field of precise thrust measurement.
Description
technical field [0001] The invention relates to a low-resistance magnetic suspension linear motion platform used for thrust measurement of a micro propeller, belonging to the field of magnetic suspension. Background technique [0002] Micro propulsion is a kind of power device with high research heat in recent years. It has the advantages of system miniaturization and high energy density at the same time, so it has great application value in military, aerospace and other fields. For most micropropulsors, thrust is one of the metrics designers must focus on. Under the same conditions, the greater the thrust generated by the propeller, the stronger its working ability and better performance. Therefore, thrust measurement is a necessary stage before most micro-thrusters are put into practical use. [0003] For now, there are mainly direct method, balance structure method, pendulum method and so on for the thrust measurement method of micro propulsion. The direct method is to...
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IPC IPC(8): G01L5/00
Inventor 范玮王致程赵明皓郑家炜唐慧何建男
Owner NORTHWESTERN POLYTECHNICAL UNIV