Direct Drive Servovalves Actuated by Amplified Piezo-Stacks: Assessment through a Detailed Numerical Analysis

Actuators

卷:10

Andrew R. Plummer¹  Riccardo Amirante²  Pietro De Palma²  Elia Distaso²  Francesco Sciatti²  Paolo Tamburrano² 

[1] Centre for Power Transmission and Motion Control (PTMC), University of Bath, Bath BA2 7AY, UK;

[2] Department of Mechanics, Mathematics and Management (DMMM), Polytechnic University of Bari, 70121 Bari, Italy;

关键词: servovalve;    direct drive;    amplified piezo-stack;   

DOI  :  10.3390/act10070156

来源: DOAJ

【 摘 要 】

This paper presents a feasibility study using commercially available amplified piezo-stacks for the direct actuation of four-way three-position (4/3) direct drive servovalves. The prospect of using amplified piezo-stacks in place of linear force motors is very attractive by virtue of their fast response speed and low weight. Piezo-stacks equipped with mechanical amplification systems can give levels of displacement suitable for this application. A very effective amplification system has recently been produced by some manufacturers and is based on a temperature-independent diamond structure. This paper details simulations of a 4/3 servovalve directly actuated by such a piezoelectric actuator with a diamond structure. To this end, well-established equations, implemented in Simulink by means of the libraries of Simscape Fluids, are used. The proposed architecture shows simplicity of construction; in addition, very good step response speed and frequency response are predicted by the simulations.

【 授权许可】

Unknown