RU-2861347-C1 - PIEZOELECTRIC DRIVE

RU2861347C1RU 2861347 C1RU2861347 C1RU 2861347C1RU-2861347-C1

Abstract

FIELD: piezotechnics. SUBSTANCE: invention relates to the field of piezotechnics and can be used for controlling manipulations. The piezoelectric actuator consists of a component piezoelectric actuator and a converting element. The component piezoelectric actuator is represented in the form of a sectional piezoelectric hollow cylinder with opposite axial polarization relative to the axis of rotation, with electrodes applied to the adjacent sides of each of the four segments of the sectional piezoelectric hollow cylinder. A voltage with a phase shift λ from π/2 to π is applied to one of the pairs of two electrodes opposite each other in a piezoelectric hollow cylinder, and a voltage with a phase shift ϕ from 0 to π/2 is applied to the other pair. The converting element is made in the form of a metal sphere, rests on a monolithic piezoelectric hollow cylinder, and sums both the vector of circular rocking motion and the vector of outgoing wave motion. EFFECT: technical result is the provision of spatial movement. 1 cl, 2 dwg

Inventors

PRILEPKO PAVEL ANATOLEVICH

Dates

Publication Date: 20260505
Application Date: 20250922

Claims (1)

A piezoelectric actuator consisting of a component piezoelectric actuator and a converting element, in which the component piezoelectric actuator is presented in the form of a four-section piezoelectric hollow cylinder with axial polarization relative to the axis of rotation and opposite polarization relative to adjacent sections, with electrodes applied to the lateral adjacent sides of each of the four sections of the piezoelectric hollow cylinder, wherein a voltage with a phase shift λ from π/2 to π is applied to one of the pairs of two electrodes opposite to each other in the piezoelectric hollow cylinder, and a voltage with a phase shift λ from π/2 to π is applied to the other pair - ϕ from 0 to π/2, which, depending on the phase, ensures either a circular rocking motion of the piezoelectric element with a displacement vector parallel to the axis of rotation of the piezoelectric hollow cylinder, or additional rocking oscillations in the format of a traveling wave in the piezoelectric hollow cylinder, as a bimorphic bending element relative to the length of the piezoelectric hollow cylinder, with a displacement vector perpendicular to the axis of rotation of the monolithic piezoelectric hollow cylinder, wherein the converting element is made in the form of a metal sphere, rests on the monolithic piezoelectric hollow cylinder and sums both the vector of the circular rocking motion and the vector of the outgoing wave motion, obtaining a two-dimensional vector of control motion.

Description

The invention relates to piezoelectric technology and can be used to control manipulations. Piezoelectric attenuator actuators (piezo actuators) are ultra-precision short-stroke linear electric drives that convert electrical voltage into small but precisely controlled linear movement with high force output. In this regard, the source where can be found in "Development of a Methodology for Designing an Instrument Drive with a Piezoelectric Actuator" (https://cyberleninka.ru/article/n/razrabotka-metodiki-proektirovaniya-pribornogo-privoda-c-piezoelektricheskim-ispolnitelnym-aktyuatorom?ysclid=mfew4co455909656848). From our perspective, the mention of the construction of piezoelectric actuators based on the traveling wave principle is of interest. In other words, the principle is used whereby the waveform acts as a propeller of liquid masses, or whereby a traveling wave moves and "drives" the liquid mass ahead of it, thereby ensuring the pumping of said liquid mass. This principle is achieved by applying a phase-shifted voltage to a series of piezoceramic plates, causing them to oscillate not in standing wave mode, but in traveling wave mode. The prototype of this invention is the patents "Pumping-rotating piezoelectric pump" (see Russian Federation patent No. 2012127523, published on 10.01.2014, IPC F04B 43/08), "Piezoelectric pump" (see Russian Federation patent No. 2012127533 published on 10.01.2014, IPC F04B 43/00), "Piezoelectric drive" (see Russian Federation patent No. 127 519, published on 27.04.2013, IPC H01L 41/08). These drives clearly demonstrate the advantages of using the traveling wave principle. However, there are a number of disadvantages, namely the irrelevance of using a piezoelectric drive in terms of direct controlled manipulations of impact devices. The closest analogue, which partially solves the specified problems, is the patent "Equipment for driving a mirror, a method for controlling this equipment for driving a mirror and a method for manufacturing this equipment for driving a mirror" (see Chinese patent No. CN102998795B published on 2016-12-21, IPC HO2N 2/00). The converting element in this device is a piezoelectric transducer, which addresses the mirror in the required direction. The advantage of this design is a compact construction, the use of a high value of the piezoelectric coefficient d 31 determining the efficiency of electromechanical conversion . The disadvantages are: 1. Relative mechanical unreliability of the glued segmented piezoelectric element; 2. Drive control occurs only in one degree of freedom and cannot be modernized without significant design changes and an increase in complexity. The listed disadvantages inherent in the analogue and prototype are eliminated in the claimed technical solution “Piezoelectric drive”. The purpose of the invention is to control a piezoelectric actuator in three dimensions and to strengthen the design of the piezoelectric actuator. The technical result is a piezoelectric drive that provides spatial control of a videoscope by using a component piezoelectric transducer made from a piezoelectric hollow cylinder. To solve the above problem, it is proposed to use a component piezoelectric drive presented in the form of a four-section piezoelectric hollow cylinder with opposite axial, relative to the axis of rotation and relative to the adjacent sections, polarization, with electrodes applied to the lateral adjacent sides of each of the four sections of the piezoelectric hollow cylinder, wherein voltage with a phase shift λ from π / 2 to π is applied to one of the pairs of two electrodes opposite to each other in the piezoelectric hollow cylinder, and to the other pair ϕ from 0 to π / 2, which, depending on the phase, provides either a circular rocking motion of the piezoelectric element, with a displacement vector parallel to the axis of rotation of the piezoelectric hollow cylinder, or provides additional rocking oscillations in the format of a traveling wave of the piezoelectric hollow cylinder, as a bimorphic bending element relative to the length of the piezoelectric hollow cylinder, with a displacement vector perpendicular to the axis of rotation a piezoelectric hollow cylinder, wherein the transforming element, made in the form of a metal sphere, rests on the piezoelectric hollow cylinder and sums both the vector of the circular rocking motion and the vector of the outgoing wave motion, obtaining a two-dimensional vector of control motion. Fig. 1 shows an example of a component piezoelectric actuator. The piezoelectric actuator includes a piezoelectric hollow cylinder 1 with opposite axial, relative to the axis of rotation and relative to adjacent sections 2,3,4,5, polarization +P, -P, with electrodes 6,7,8,9 applied to the lateral adjacent sides of each of the four sections of the piezoelectric hollow cylinder, wherein voltage with a phase shift ϕ from π/2 to π is applied to one of the pairs 6, 8 of two electrodes opposite to each