Active magnetic suspension accelerometer

Abstract

The invention relates to an active magnetic suspension accelerometer with high alignment, high stability and high resolution; the active magnetic suspension accelerometer comprises a short circuit turn angle sensor, a permanent magnetism torquer, a liquid float plus jewel bearing and active magnetic suspension centering, and double-end bellows volume compensation; when an inertia acceleration applies on a floater, a vertical pendulum deflects, the angle sensor senses the deflection angle, a force feedback loop forms a control current, the control current is applied to a permanent magnetism torquer control coil, thus restoring the vertical pendulum back to the zero bit; control current size symbols are matched with inertia acceleration sizes and directions. Said measures can improve the accelerometer precision; the precision of the accelerometer working under the gate state can improve by almost an order of magnitude when compared with a liquid floating integration pendulum accelerometer. The accelerometer with the active magnetic suspension technology is firstly applied in our nation, thus greatly improving the accelerometer stability and dynamic adaptability; the accelerometer canbe applied to an inertia space navigation system.

Description

Technical field [0001] The invention belongs to the technical field of accelerometers, in particular an active magnetic levitation accelerometer with high alignment, high stability and high resolution, and is particularly suitable for an inertial navigator system stabilized in an inertial space. Background technique [0002] In the past, the accelerometer of the inertial navigation system used a liquid floating integral pendulum accelerometer. The main technologies of the accelerometer include: 1) moving coil angle sensor technology; 2) permanent magnet torque device technology; 3) liquid float plus jewel bearing centering technology; 4) single-ended bellows volume compensation technology. When the inertial acceleration acts on the float, the pendulum will deflect, the angle sensor is sensitive to the deflection angle, and the control current is generated through the force feedback loop, which is applied to the permanent magnet torque device control coil to restore the pendulum t...

AI Technical Summary

Problems solved by technology

When the accelerometer is flipped from one attitude to another, due to the existence of the input alignment error angle, the accelerometer takes a long time to stabilize and the repeatability is poor

Especially when the accelerometer works in the "gate" state, the existence of a large axial gap further exacerbates the long stabilization time and poor repeatability

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