Mechanical shafting rotary error active compensation device based on piezoelectric actuator

Abstract

The invention provides a mechanical shafting rotary error active compensation device based on a piezoelectric actuator, and relates to the field of mechanical shafting rotary error active compensation. The device aims at solving the problems that the rotary precision of a traditional rolling bearing supporting shafting can hardly be improved in a breakthrough manner through machining and assembling links. The device comprises a metal end cap, two metal gaskets, the piezoelectric actuator and a base support. The piezoelectric actuator is formed by stacking multiple layers of piezoelectric ceramic pieces and metal electrode pieces, wherein the piezoelectric ceramic pieces and the metal electrode pieces are alternately arranged. Each layer of piezoelectric ceramic piece is composed of four sector rings defining a ring, and a certain gap is reserved between every two adjacent sector rings. In each layer of piezoelectric ceramic piece, the polarization directions of a pair of opposite sector rings are opposite, and the polarization directions of the sector rings corresponding to the adjacent piezoelectric ceramic pieces in the axial direction are opposite, in other words, the polarization directions in the axial direction are alternately distributed. The piezoelectric actuator is used as an actuator of the compensation device, and the beneficial effects of being high in displacementcontrol precision and high in response speed are achieved.

Description

technical field [0001] The invention relates to the technology of active compensation of rotation error of mechanical shaft system and active suppression of rotor vibration. Background technique [0002] Precision shafting is one of the basic functional components of high-end CNC machine tools, robots, aerospace equipment, precision instruments and other equipment, and is widely used in industrial production and assembly manufacturing. The rotation accuracy of precision shafting determines the performance and value of precision equipment, and also determines the technical level of precision machining and precision measurement in a country. It is of great significance to design precision shafting with higher rotation accuracy. At the same time, in workplaces that have strict requirements on running stability, such as tiny spacecraft, the small vibration of components may have an important impact on the directivity and stability of the system. The precision shafting can make t...

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Problems solved by technology

[0005] The invention aims to solve practical problems such as the fact that the rotation accuracy of the traditional rolling bearing supporting shaft system is difficult to obtain a breakthrough improvement through machining and assembly, the rotation error affects the machining accuracy of the machine tool, and the pointing accuracy of precision equipment. Active Compensation Device for Mechanical Shaft Rotation Error of Actuator

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