Piezoelectric thread driving type one-dimensional positioning platform

Abstract

The invention relates to a piezoelectric thread driving type one-dimensional positioning platform, and belongs to the technical field of precision driving and positioning. The platform comprises a positioning workbench, a lifting mechanism, a driving mechanism and a base; the driving mechanism includes a piezoelectric thread driver composed of a stator and a rotor; the stator consists of four piezoelectric transducers with the same structure and a flange nut, and the rotor is a screw rod; the four piezoelectric transducers are located in the base and connected with the outer circumference of the nut base through flexible hinges respectively. The flange nut is fixed to one axial end of the nut seat and connected with the screw in a matched mode. The upper end of the screw rod is in contactwith the bottom surface of the positioning workbench, when two groups of sine alternating-current voltages with the same frequency, the same amplitude and the phase difference of pi / 2 are adopted andthe driving signals are used as two groups of driving signals for forming four piezoelectric transducers which are orthogonally arranged, the screw rod is driven to obtain the rotating speed, generateclockwise or anticlockwise rotating motion and convert the clockwise or anticlockwise rotating motion into axial linear motion, so that the positioning workbench is pushed to generate upward or downward lifting motion.

Description

technical field [0001] The invention belongs to the technical field of precision driving and positioning, in particular, it is a piezoelectric thread-driven one-dimensional positioning platform. Background technique [0002] Most of the positioning platforms of traditional three-coordinate measuring machines use electromagnetic motors as driving components, and DC servo motors are often used. The DC servo motor has good servo characteristics and a wide speed range, but the structure is relatively complicated, the equipment cost is high, and it is easy to receive magnetic field interference during the work process. Compared with traditional electromagnetic motors, piezoelectric motors have the characteristics of simple structure, fast response, no electromagnetic interference, and self-locking when power is off. They have been widely used in precision positioning systems, and the most widely used ones are inchworm piezoelectric motors. . The inchworm piezoelectric motor is ...

AI Technical Summary

Problems solved by technology

[0003] However, the inchworm piezoelectric motor generally works under quasi-static conditions, the electromechanical conversion efficiency is low, and the drive is complicated.

In addition, the positioning stroke of the inchworm piezoelectric positioning system is as short as millimeters, the positioning speed is less than 10mm / s, the driving force is small, and the overall restrictions are more, which reduces the application scenarios of piezoelectric motors in positioning systems

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