Large-displacement miniature actuator and driving method thereof

Abstract

The invention discloses a large-displacement miniature actuator and a driving method thereof, and belongs to the technical field of an actuator. The actuator comprises a driving unit and a shell, wherein the driving unit comprises an execution mechanism, a connection piece and locking mechanisms, the execution mechanism is formed by connecting a plurality of sheet-shaped piezoelectric ceramics in series, the connection piece comprises an S-shaped planar spring, a clamping head and a rod, the locking mechanisms are two high-temperature shortened shape memory alloys, and a plurality of grooves are formed in the shell. By means of a piezoelectric ceramic inverse piezoelectric effect and an embodiment function of the locking mechanisms and the shell, the telescopic movement of the actuator is achieved. The actuator has the advantages of small size, large driving force, large displacement, simple structure, low cost, no noise, no magnetism and the like, is convenient to install and can be widely applied to an electromechanical system.

Description

technical field [0001] The invention belongs to the technical field of actuators, and in particular relates to a large-displacement micro-actuator and a driving method thereof. Background technique [0002] At present, in the electromechanical system and weapon system, the pin pusher extension actuation and the pin puller retraction actuation are two common types of drives. The drive methods of the above two types of motion drives are mainly motor drive and electromagnetic drive. and gunpowder drive. Motor-driven and electromagnetic-driven drivers have problems such as complex structure, high price, and low efficiency of electrical-mechanical energy conversion. The driver driven by gunpowder mainly uses the gas generated by the combustion of gunpowder to drive the piston to do work. Due to the influence of factors such as structure, gas pressure transmission direction and sealing, in actual engineering applications, the driver driven by gunpowder has low reliability, low en...

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a large-displacement micro-actuator and its driving method. The technical problems of complex technical structure and low energy conversion efficiency in motor drive, electromagnetic drive and gunpowder drive, etc., solve the problem of small displacement of piezoelectric ceramic actuators at the same time

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