A Rotary Drive Device Based on Piezoelectric Stack

Abstract

The invention discloses a piezoelectric stack-based rotary drive device, which includes a driving stator I, a driving stator II, a fixed stator and a driving shaft; the driving stator I, the fixed stator and the driving stator II are arranged in sequence from top to bottom, adjacent The star-shaped platforms are connected by flexible hinges, and the drive shaft passes through the center of the star-shaped platforms of the driving stator I, the fixed stator and the driving stator II. In the piezoelectric stack-based rotary drive device provided by the present invention, the drive shaft can be started at any position, and the forward and reverse rotation of the drive shaft can be realized. In a single stepping action, the small displacement of the piezoelectric stack is converted into the small Rotation angle, high rotation accuracy, combined with the high-frequency response of the piezoelectric stack, the rotation axis can be rotated at a high angular velocity and a large stroke rotation on the entire circumference can be realized. It has the advantages of compact structure, high motion resolution, and large stroke.

Description

technical field [0001] The invention belongs to the technical field of drives, and relates to a piezoelectric stack-based rotary drive device. Background technique [0002] In recent years, with the continuous development of science and technology such as modern medicine, aviation and precision machining, the field of science and technology has put forward higher requirements for the positioning accuracy, corresponding response speed, output force and control characteristics of the transmission mechanism. Therefore, the new high-precision driver has become a research hotspot. Among them, the piezoelectric actuator is a device that uses the inverse piezoelectric effect of piezoelectric materials (mainly piezoelectric ceramics) to convert electrical energy into mechanical energy under the action of an electric field to generate mechanical deformation (displacement). Although the deformation is very small, it is very stable. High, and can achieve high-frequency changes. [00...

AI Technical Summary

Problems solved by technology

However, the existing stepping piezoelectric actuators usually have the problems of complex structure and difficult control, and often have the problem that the minimum displacement resolution and sufficiently large motion range cannot be taken into account, which is not conducive to the practical application of stepping piezoelectric actuators.

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