Direct drive servovalves actuated by amplified piezo-stacks: Assessment through a detailed numerical analysis

Paolo Tamburrano, Elia Distaso, Andrew R. Plummer, Francesco Sciatti, Pietro De Palma, Riccardo Amirante

Research output: Contribution to journalArticlepeer-review


This paper presents a feasibility study using commercially available amplified piezostacks 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.

Original languageEnglish
Article number156
Issue number7
Publication statusPublished - 7 Jul 2021


  • Amplified piezo-stack
  • Direct drive
  • Servovalve

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Control and Optimization

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