A Rotation Modulation Axial Spherical Pure Electromagnetic Bearing

Abstract

A rotationally modulated axial spherical pure electromagnetic bearing, mainly comprising: an upper stator core, a lower stator core, an upper axial bearing coil, a lower axial bearing coil, a rotor, an upper axial air gap, a lower axial air gap, and a stator It consists of a mounting plate, a rotation modulation rotor bearing sleeve, a rotation modulation bearing, a rotation modulation rotor lock nut, an ultrasonic motor rotor, an ultrasonic motor stator, a rotation modulation stator bearing sleeve and a rotation modulation stator lock nut. Since the stator of the axial spherical pure electromagnetic bearing is driven by an ultrasonic motor, the rotation of the stator is realized, so it has a rotation modulation function, so it can eliminate the gyro drift caused by the rotation of the gyro rotor, and greatly improve the detection when it realizes the angular rate detection precision.

Description

technical field [0001] The invention relates to a non-contact axial magnetic suspension bearing, especially a spherical pure electromagnetic magnetic bearing with rotation modulation function, which can be used as non-contact support for rotating parts in small spacecraft, and is especially suitable for non-contact support of magnetic suspension sensitive gyroscopes . [0002] technical background [0003] With the development of aerospace technology, satellites, space stations and other spacecraft have higher and higher requirements for attitude control accuracy, and traditional mechanical momentum wheels can no longer meet the requirements. The magnetic levitation flywheel is supported by magnetic bearings, which eliminates the wear caused by mechanical bearings and improves the accuracy and stability of torque control. [0004] In the existing magnetic levitation flywheel structure, a single-degree-of-freedom axial magnetic bearing or a three-degree-of-freedom axial magne...

AI Technical Summary

Problems solved by technology

However, when the rotor deflects, the magnetic air gap between the stator and rotor of the magnetic bearing is uneven, resulting in uneven electromagnetic force in the magnetic pole surface, thereby generating a torsional moment relative to the center of mass of the rotor, that is, the translation control produces an interference torque to the torsion control

The magnetic pole surfaces of the permanent magnet bias axial magnetic bearings described in Chinese patent application numbers 200510011272.2 and 200710098749.4 are all cylindrical. When the magnetic bearing deflects, there is an uneven air gap between the stator and the rotor, resulting in a large torsional negative torque. , which increases the load on the torsional bearing of the flywheel, thereby reducing the control precision and control torque precision of the flywheel rotor

In addition, if the existing magnetic levitation flywheel or magnetic levitation gyro is to realize its detection function as a sensitive component, it is often limited by the environmental disturbance torque, which leads to the reduction of the accuracy of the detection component.

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