A piezoelectric tachometer

Abstract

The invention discloses a piezoelectric type rotating speed meter which comprises a base, a rotating shaft structure, a piezoelectric vibration ring structure and an electric brush structure, wherein the piezoelectric vibration ring structure comprises a vibration ring which is externally octagonal and internally circular; piezoelectric ceramic sheets are respectively attached to eight outer surfaces of the vibration ring; and under the action of a piezoelectric effect and an inverse piezoelectric effect of the piezoelectric ceramic and the colcafe force, corresponding modals are excited by applying a voltage signal, so that the input angle speed can be finally calculated. The piezoelectric type rotating speed meter is simple in structure, convenience to process, low in cost, high in accuracy of input induction signals and high in precision and sensitivity and has a good development and application prospect.

Description

Technical field: [0001] The invention relates to a piezoelectric tachometer, which belongs to the field of angle and angular velocity sensors. Background technique: [0002] The piezoelectric structure, which is driven by the piezoelectric effect of piezoelectric ceramics and induced by the inverse piezoelectric effect, is often used to measure angular velocity. Because of its simple structure, no rotating parts, higher reliability than ordinary gyroscopes, high sensitivity, long life, short start-up time, low power consumption, and low cost, it is often used as an angular velocity sensor and has broad research and application prospects. [0003] Solid wave gyro is a common form of piezoelectric gyroscope used as an angular velocity sensor. The existing solid wave gyro resonators are all ring-shaped symmetrical structures, and the common structural forms are ring, cup, and hemispherical. Working principle: Driven by piezoelectric means, the circularly symmetrical resonator ...

AI Technical Summary

Problems solved by technology

The existing harmonic oscillators of solid wave gyroscopes have some defects: first, due to the structural characteristics of the harmonic oscillators, high requirements are placed on the machining accuracy, the processing is relatively difficult, and the cost is also high; second, because the harmonic oscillators are mostly Ring, cup and hemispherical, piezoelectric ceramics cannot be pasted on the surface, and ceramic sheets are usually pasted on the external support structure, which inevitably affects the input signal

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