Antisymmetric arrangement type unimorph stack driven bidirectional rotary inertial actuator and method

Abstract

An anti-symmetric arrangement-type single piezoelectric stack-driven bidirectional rotary inertial actuator, and a method. The actuator is composed of an upper end cover, a bearing, an output shaft, a rotating disc and an actuating mechanism. The actuating mechanism is machined in one piece, and is anti-symmetrically arranged around the center of a rhombic ring comprised therein. The inside of the rhombic ring is axially interference-fitted with a piezoelectric stack. Planes on both sides of the rhombic ring in an axial direction are rigidly connected with an L-shaped lever amplifying mechanism, respectively. One end of an axial rod of the L-shaped lever amplifying mechanism is connected to a mounting base via a flexible hinge, and the other end is fixedly connected with a transverse rod member, and a friction foot is machined to protrude above the transverse rod member. The rotating disc is horizontally placed above the friction foot of the actuating mechanism, and an output shaft is arranged at the center of upper surface of the rotating disc. The output shaft is connected to the spindle-shaped upper end cover by means of a bearing, and both ends of the upper end cover are provided with a mounting through hole, through which the output shaft is closely connected to the actuating mechanism at the bottom end by bolts. The invention has the advantages of small size and novel structure, and can realize high-precision bidirectional rotary motion smoothly only by driving a single piezoelectric stack.

Description

technical field [0001] The invention belongs to the technical field of inertial piezoelectric actuators, and in particular relates to an antisymmetrically arranged single piezoelectric stack-driven bidirectional rotary inertial actuator and an actuating method. Background technique [0002] Inertial piezoelectric actuator is a kind of mechanism that adopts asymmetrical driving signal, asymmetrical mechanical clamping structure or asymmetrical friction force as the control mode, and forms the driving mechanism through inertial impact motion. [0003] Compared with other types of piezoelectric drives, inertial piezoelectric actuators have the main advantages of simple structure, fast response, high resolution, large stroke, fast movement speed, and low cost. positioning accuracy. Therefore, inertial piezoelectric actuators are suitable for occasions that require high resolution and large strokes. At present, scientific and technological workers have successfully applied iner...

AI Technical Summary

Problems solved by technology

[0004] Generally, rotary inertial piezoelectric actuators often use bimorphs or multiple piezoelectric stacks as driving elements, which have complex structures and high costs; currently, most rotary inertial actuators only rely on line contacts for clamping , the clamp is likely to fail due to surface wear during the actuation process; in addition, the step distance of a large number of piezoelectric inertial actuators is very small, in order to achieve high-speed corner output, the requirements for the drive system are often high, and the actuation efficiency is low

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