A kind of permanent magnet torque device for accelerometer

Abstract

The invention belongs to the technical field of flexible pendulum accelerometers, in particular to a silicon-based coil-based permanent magnetic torquer for inertial navigation accelerometers. The permanent magnetic torque device for accelerometer of the present invention comprises a yoke, a permanent magnet, a magnetically conductive sheet and a silicon-based coil, wherein the yoke is located at the bottom, the permanent magnet is fixed on the yoke, and the magnetically conductive sheet is fixed on the upper surface of the permanent magnet . A permanent magnetic air gap is formed between the yoke and the magnetic permeable sheet, and the silicon-based coil is located inside the permanent magnetic air gap. When the permanent magnetic torque device is working, the silicon-based coil is fixed on the accelerometer pendulum through the coil spacer. The invention adopts the silicon-based coil to replace the enameled wire winding coil of the accelerometer permanent magnet torquer, effectively reduces the thermal stress between the accelerometer pendulum plate and the permanent magnet torquer coil, and simultaneously reduces the viscoelasticity of the coil. The silicon-based coil has better spatial stability in the permanent magnetic circuit, which can significantly improve the stability of the scale factor of the accelerometer.

Description

technical field [0001] The invention belongs to the technical field of flexible pendulum accelerometers, in particular to a silicon-based coil-based permanent magnetic torquer for inertial navigation accelerometers. Background technique [0002] The flexible accelerometer for inertial navigation is the core device in inertial navigation equipment, and the temperature and time repeatability of its zero position and scale factor directly affect the accuracy level of inertial navigation. With the continuous advancement of modern aerospace technology, the inertial navigation system has higher and higher requirements for the accelerometer, and the repeatability improvement of the accelerometer scale factor has become a technical bottleneck for the improvement of the accelerometer level. For the flexible pendulum accelerometer, the stability of its torque device is the key factor to determine the stability of the accelerometer scale factor. [0003] The torquer is composed of two...

AI Technical Summary

Problems solved by technology

The structure of the silicon-based coil is stable, but there are problems of short winding length and high coil resistance, and it is difficult to directly apply it to the torquer for the accelerometer

[0005] The torquer coil for the accelerometer is usually fixed on the pendulum of the accelerometer by gluing. This connection method has the problems of poor positioning consistency and large thermal stress. A spacer can be added between the coil and the pendulum to control the position of the coil and reduce the Small thermal stress, but the effect of this structure to reduce the thermal stress between the coil and the pendulum is still very limited

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