Stepper actuator driven by double piezoelectric stack and its actuation method using wedge-shaped locking mechanism

Abstract

A double piezoelectric stack driven stepping actuator with a wedge-shaped locking mechanism and its actuation method, the actuator includes two clamping mechanisms and a rigid fixed plate with a guiding function fixed on both sides of the clamping mechanism on the bottom plate, The rigid fixed plate and the clamping mechanism are connected by a spring, and the locking force required by the actuator is provided by the preload of the spring; the two wedge blocks are placed in the same direction, and are fixedly connected by the actuating ring with the piezoelectric stack installed inside. . The upper part of the device is a moving part, the surface of the moving part on the left and right sides is covered with fine teeth, and the fine teeth on the surface of the clamping mechanism are interlocked to achieve the purpose of increasing the maximum static friction force; the moving parts on the left and right sides pass through another An actuating ring with a built-in piezoelectric stack is fixedly connected, and the purpose of locking one end and unlocking the other end is achieved through the expansion and contraction of the lower piezoelectric stack, and the upper piezoelectric stack completes the driving stepping movement; the present invention only uses two piezoelectric stacks to facilitate The driving step is completed, which can provide greater locking force and maximum static friction.

Description

technical field [0001] The invention belongs to the technical field of stepping piezoelectric actuators, and in particular relates to a stepping actuator driven by a double piezoelectric stack using a wedge-shaped locking mechanism and an actuating method Background technique [0002] Piezoelectric actuators are widely used in aerospace, aviation, medical and other fields. Piezoelectric stepping actuators imitate the crawling mode of natural inchworms. Through the accumulation of small step displacements of piezoelectric stacks, precise bidirectional stepping motions with small step distances, theoretically infinite strokes, and high resolution can be realized. However, the existing structure often cannot provide a large locking force, and the phenomenon of slippage often occurs, resulting in a decrease in precision. At the same time, the existing actuator usually requires three or more piezoelectric stacks to work, which brings operational problems The actuator is large in...

AI Technical Summary

Problems solved by technology

However, the existing structure is often unable to provide a large locking force, and the phenomenon of slippage often occurs, resulting in a decrease in accuracy. The actuator is large in size, high in quality, and high in cost

Images