Rotation driving device based on piezoelectric stack

Abstract

The invention discloses a rotary driving device based on piezoelectric stacks. The rotary driving device comprises a driving stator I, a driving stator II, a fixed stator and a driving shaft, wherein the driving stator I, the fixed stator and the driving stator II are sequentially arranged from top to bottom, adjacent star-shaped platforms are connected through flexible hinges, and the driving shaft is arranged at the centers of the star-shaped platforms of the driving stator I, the fixed stator and the driving stator II in a penetrating mode. According to the rotary driving device based on the piezoelectric stack, the driving shaft can be started at any position so as to achieve forward and reverse rotation of the driving shaft; in single stepping action, micro displacement of the piezoelectric stack is converted into a micro rotation angle of the rotary disc, so that the rotation precision is high; and by matching with high-frequency response of the piezoelectric stack, the rotary shaft rotates at a high angular speed, large-stroke rotation on the whole circumference is achieved, and the advantages of being compact in structure, high in motion resolution, large in stroke and the like are achieved.

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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