Magnetic striction piezoelectric gyroscope possessing double nested square shape column vibrator

Abstract

The invention discloses a magnetostrictive piezoelectric gyroscope with a square-hole-shaped cylindrical vibrator in the micro electromechanical technical field, which consists of a magnetostrictive vibrator, a driving electrode, an output electrode and a model detection electrode. The vibrator, which adopts piezoelectric material, is a square-hole cylindrical body with a square through hole. Allof the electrodes are symmetrically distributed and are centered by the magnetostrictive vibrator. The vibration of the magnetostrictive vibrator under the special model of certain frequency is regarded as working state; the magnetostrictive vibrator has special positions in both directions in which the moving directions on an upper surface and a lower surface are opposite. When the outside worldhas angular velocity, Coriolis force with opposite direction is generated on the opposite position of the moving direction to enable the magnetostrictive vibrator to stretch or compress and generate electric potential, and the angular velocity of the outside dual axis is detected through the electric potential on the output electrode. The magnetostrictive piezoelectric gyroscope has the advantages of simple structure, strong shock resistance, being free of vacuum encapsulation, convenient fixing nodes, sensitive dual axis detection, simple processing technology and power consumption saving owing to being free of high-speed rotation.

Description

technical field [0001] The invention relates to a micro-gyroscope in the field of micro-electromechanical technology, in particular to a magnetostrictive piezoelectric gyroscope with a "back"-shaped columnar vibrator. Background technique [0002] Gyroscope is the core device of attitude control and inertial guidance. The development of inertial technology and the improvement of guidance requirements for satellites and missiles require gyroscopes to develop in the direction of low power, long life, small size, and adaptability to various harsh environments. [0003] After searching the literature of the prior art, it was found that the Chinese patent "Piezoelectric Gyro Element and Piezoelectric Gyroscope" (patent application number: 200510131905.3) mentions that the structure of the prismatic vibrating body of the piezoelectric material can be used to detect the 2-axis Angular velocity in the direction. One end of a prism-shaped piezoelectric vibrator with a rectangular cr...

AI Technical Summary

Problems solved by technology

[0004] This technology has the following disadvantages: First, the drive circuit requires multiple phase shifts, and some drive circuits also include amplitude detection circuits and AGC circuits, which have high requirements for control, and the circuits are complex, with large interference and noise, and it is difficult to obtain ideal drive signals.

Secondly, by applying four-phase driving signals with different phases to four different electrodes to make the piezoelectric body itself generate circular motion as a reference motion, regular circular motion is difficult to achieve accurately, which increases the error of angular velocity detection

To ensure that the piezoelectric body rotates to obtain high-speed circular motion, the power consumption is large

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