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A magnetic fluid flywheel and its design method

A design method and magnetic fluid technology, applied in the field of satellite control, can solve the problems of high-speed rotor disturbance, long life difficulty, precision and complexity, etc., and achieve the effects of overcoming friction damping and wear, simple driving control circuit, and suppressing vibration and noise.

Active Publication Date: 2020-09-18
BEIJING INST OF CONTROL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the development of aerospace and technological progress, a large number of micro-nano satellites have put forward the demand for miniaturization and high performance of the actuator. The traditional mechanical flywheel has the following problems: (1) The structure is complex, and each part of the five major components is sophisticated and miniaturized. Difficulty; (2) In terms of life, due to mechanical wear, it is difficult to achieve long life; (3) In terms of vibration and noise, due to friction damping and wear, there is a disturbance problem of high-speed rotors, and due to the limitation of miniaturization, it is not suitable Add traditional vibration isolators and dampers, and the performance improvement of the product is limited

Method used

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  • A magnetic fluid flywheel and its design method
  • A magnetic fluid flywheel and its design method
  • A magnetic fluid flywheel and its design method

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Effect test

Embodiment 1

[0060] A method for designing a magnetic fluid flywheel. An annular cavity is provided inside the magnetic fluid flywheel, and a conductive fluid is filled in the annular cavity; a magnetic steel is provided on the axial side of the annular cavity, and the circumference of the annular cavity Electrodes are provided on both the inner side and the outer side; the conductive fluid rotates under the action of the potential difference and the magnetic field;

[0061] The MHD flywheel design includes the following steps:

[0062] S1. Based on the externally set angular momentum H, set the fluid angular velocity ω FL ;

[0063] S2, according to H=Jω FL Calculate the fluid mass moment of inertia J; then select the conductive fluid material and determine the fluid density ρ of the conductive fluid material; then according to J=Ahρr 2 , to determine N sets of parameter combinations, each set of parameter combinations includes the outer ring radius r 0 , inner ring radius r i and ch...

Embodiment 2

[0075] A method for designing a magnetic fluid flywheel. An annular cavity is provided inside the magnetic fluid flywheel, and a conductive fluid is filled in the annular cavity; a magnetic steel is provided on the axial side of the annular cavity, and the circumference of the annular cavity Electrodes are provided on both the inner side and the outer side; the conductive fluid rotates under the action of the potential difference and the magnetic field;

[0076] The MHD flywheel design includes the following steps:

[0077] S10. Based on the externally set angular momentum H, set the fluid angular velocity ω FL ;

[0078] S20, according to H=Jω FL Calculate the fluid mass moment of inertia J; then select the conductive fluid material and determine the fluid density ρ of the conductive fluid material; then according to J=Ahρr 2 , to determine N sets of parameter combinations, each set of parameter combinations includes the outer ring radius r 0 , inner ring radius r i and ...

Embodiment 3

[0089] A magnetic fluid flywheel, comprising a flywheel body, a speed measuring device, and a flywheel circuit; the flywheel body includes a conductive fluid ring assembly, a magnetic steel assembly, and electrodes, such as figure 1 shown;

[0090] The magnetic steel component can generate a magnetic field to act on the conductive fluid in the conductive fluid ring component; when the conductive fluid in the conductive fluid ring component rotates, it can generate output torque and angular momentum; the electrodes are used to give the conductive fluid energizing a conductive fluid within the fluid ring assembly, said conductive fluid rotating under the action of a potential difference and a magnetic field;

[0091] The speed measuring device is used to measure the fluid angular velocity of the conductive fluid, and then send it to the flywheel circuit. The speed measuring device adopts a piezoelectric sensor; Momentum, which controls the energization voltage of the electrodes...

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Abstract

A magnetic fluid flywheel and a design method belong to the technical field of satellite control. The principle of the magnetic fluid flywheel is to actively adjust the potential difference between the two ends of conductive fluid so as to generate a high-density current inside the conductive fluid and enable the conductive fluid to rotate under the action of a magnetic field. The design method includes the following steps: based on an externally set angular momentum, setting the angular velocity of the fluid, and calculating the mass moment of inertia of the fluid; selecting a conductive fluid material and determining the fluid density of the conductive fluid material; determining n parameter combinations of outer ring radius, inner ring radius and channel thickness; and determining the channel magnetic induction intensity based on an external set output torque and according to magnetic steel, and selecting any one of the parameter combinations according to the current of electrodes to calculate the actual output torque of the magnetic fluid flywheel until an externally set output torque requirement is met. The magnetic fluid flywheel has the advantages of simple structure, easy realization of miniaturization and long service life, and vibration and noise can be suppressed by the self-balance of the fluid.

Description

technical field [0001] The invention relates to a magnetic fluid flywheel and a design method, belonging to the technical field of satellite control. Background technique [0002] Flywheel is an important executive component in spacecraft attitude control system. The traditional mechanical flywheel is a high-speed rotating rotor driven by a drive motor with a certain mass size and mass distribution. [0003] The whole flywheel is composed of five parts: shell assembly, wheel body assembly, bearing assembly, motor assembly and circuit assembly. The shell assembly provides the package and installation of the flywheel, the bearing assembly provides the support for the rotation of the wheel assembly, the motor assembly drives the rotation of the wheel assembly, and the circuit assembly drives and controls the flywheel motor to realize the control of the flywheel current / speed. The moment of inertia of the flywheel is mainly provided by the wheel assembly. [0004] With the de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K15/00H02K44/04
CPCH02K15/0006H02K44/04
Inventor 杨屹杨磊张激扬武登云齐明张绍卫张鹏波李醒飞钟莹卢国权周建涛何勇
Owner BEIJING INST OF CONTROL ENG
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