A five-degree-of-freedom magnetic levitation flywheel

Abstract

The invention discloses a five-freedom-degree magnetic suspension flywheel. The five-freedom-degree magnetic suspension flywheel can serve as a posture control execution mechanism of a satellite, an earth observation platform, a space telescope and other spacecrafts and is composed of a magnetic bearing, a high-speed motor, a radial and axial integrated sensor, a radial sensor, an upper protectionbearing, a lower protection bearing, a core shaft, a wheel body, a base, an upper sensor detection ring, a lower sensor detection ring and a shell. The radial magnetic bearing in the five-freedom-degree magnetic suspension flywheel controls two radial-direction transverse motions of a flywheel rotor, the axial magnetic bearing controls the axial transverse motion and two radial deflection motionof the rotor of the flywheel, all components are compact in layout, the size and the weight are reduced, the rotating speed zero-passage friction force and mechanical wear of the flywheel of the mechanical bearing can be removed, and output torque and the control precision of the flywheel can be improved.

Description

technical field [0001] The invention relates to a magnetic levitation flywheel, in particular to a magnetic levitation flywheel with five degrees of freedom capable of outputting large deflection torque, which can be used as an actuator for attitude control systems of spacecraft such as satellites, earth observation platforms, spaceships, and space telescopes. Background technique [0002] The attitude control actuators of spacecraft such as satellites, earth observation platforms, spacecraft, and space telescopes require small size, light weight, long life, low power consumption, and high reliability. At present, the flywheel, which is the actuator of the spacecraft attitude control system, is still generally supported by mechanical bearings, which fundamentally limits the increase in the speed of the flywheel. Therefore, in order to achieve the required angular momentum, the weight of the flywheel and the volume have to be increased. . In addition, mechanical bearings hav...

AI Technical Summary

Problems solved by technology

At present, the flywheel used as the actuator of the spacecraft attitude control system is generally still supported by mechanical bearings, which fundamentally limits the increase in the speed of the flywheel. Therefore, in order to achieve the required angular momentum, the weight and volume of the flywheel have to be increased.

In addition, mechanical bearings have problems such as mechanical wear, unbalanced vibration, and large zero-crossing friction torque, which seriously affect the service life of the flywheel and the accuracy and stability of spacecraft attitude control.

The existing maglev flywheels supported by magnetic bearings can be divided into single-degree-of-freedom maglev flywheels to five-degree-of-freedom maglev flywheels according to the degree of freedom of suspension. The existing five-degree-of-freedom flywheel structure usually uses two radial magnetic The bearing provides two radial translation and two radial deflection movements, and an axial magnetic bearing is used to provide an axial translation movement. When the flywheel is required to output a large deflection moment, it is usually output by adding two radial magnetic bearing spans Sufficient torque, which will make the mandrel longer, reduce the mode, limit the speed increase, and aggravate the vibration

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