Linear large-displacement piezoelectric actuator with power-off clamping function and method

Abstract

The invention discloses a linear large-displacement piezoelectric actuator with a power outage clamping function and a method. The actuator comprises a base, a left clamping mechanism and a right clamping mechanism, wherein the left clamping mechanism and the right clamping mechanism are respectively fixed at two ends of the base; a right clamping piezoelectric stack is arranged in a hollow cavity of the right clamping mechanism; two ends of the right clamping piezoelectric stack are connected through flexible hinges and the right clamping mechanism; two flexible hinges are symmetrically arranged at the lower part of the hollow cavity of the right clamping mechanism; the upper part of the hollow cavity of the right clamping mechanism is of split structures; semicircular holes are respectively formed in the split structures at two sides and form a round hole; the left clamping mechanism and the right clamping mechanism are identical in structures; an elliptical driving mechanism is arranged between the left clamping mechanism and the right clamping mechanism; a driving piezoelectric stack is arranged in the elliptical driving mechanism by adopting an interference fit manner; a guide rod and an output rod are respectively connected to the left end and the right end of the elliptical driving mechanism; the other end of the guide rod and the other end of the output rod respectively penetrate through the round holes in the left clamping mechanism and the right clamping mechanism. The invention also provides a method for driving a load. The linear large-displacement piezoelectric actuator and the method disclosed by the invention have the advantages of compact structure and high simplicity for assembly; key parts are respectively processed by adopting a low-speed wire cutting process, so the precision is higher.

Description

technical field [0001] The invention belongs to the technical field of stepping piezoelectric actuators, and in particular relates to a linear large-displacement piezoelectric actuator with power-off clamping function and a method thereof. Background technique [0002] Piezoelectric actuators have been widely used in aerospace, aviation, medical and other fields. Among them, the stepping actuator imitates the crawling mode of the natural inchworm, and through the accumulation of the displacement of the piezoelectric stack in a small step, it can realize the precise two-way stepping motion with small step, infinite theoretical stroke and high resolution. However, the crawling method used in the past stepping actuators requires three piezoelectric elements that cooperate with each other to move together, so its structure is relatively heavy under high-frequency driving conditions, and it cannot be driven at higher frequencies, thus limiting the actuation The rate at which the...

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Problems solved by technology

However, the crawling method used in the past stepping actuators requires three piezoelectric elements that cooperate with each other to move together, so its structure is relatively heavy under high-frequency driving conditions, and it cannot be driven at higher frequencies, thus limiting the actuation The rate at which the device shifts the output

[0003] In addition, the previous stepping piezoelectric actuators mostly used the power-on clamping method, and in the application where the system is required to maintain the output displacement even when the system is powered off, the previous actuators could not complete such tasks

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