Preprint Review Version 1 Preserved in Portico This version is not peer-reviewed

A Review of Novel Architectures of Servovalves Driven by Piezo-Electric Actuators

Version 1 : Received: 3 July 2021 / Approved: 5 July 2021 / Online: 5 July 2021 (12:33:44 CEST)

How to cite: Tamburrano, P.; Sciatti, F.; Plummer, A.R.; Distaso, E.; De Palma, P.; Amirante, R. A Review of Novel Architectures of Servovalves Driven by Piezo-Electric Actuators. Preprints 2021, 2021070098 (doi: 10.20944/preprints202107.0098.v1). Tamburrano, P.; Sciatti, F.; Plummer, A.R.; Distaso, E.; De Palma, P.; Amirante, R. A Review of Novel Architectures of Servovalves Driven by Piezo-Electric Actuators. Preprints 2021, 2021070098 (doi: 10.20944/preprints202107.0098.v1).

Abstract

This paper is a thorough review of innovative architectures of electro-hydraulic servovalves that exploit actuation systems based on piezo-electric materials. The use of commercially available piezo-electric actuators, namely, piezo-stacks, amplified piezo-stacks, rectangular benders and ring benders, is very promising for the actuation of the main stages and of the pilot stages of servovalves, given the fast response and low weight of piezoelectric materials. The use of these actuators can also allow novel designs to be developed, thus helping manufacturers to overcome the typical drawbacks of commercial servovalves, such as the high complexity and the high internal leakage of the pilot stages of two stage servovalves, as well as the large size and weight of direct drive servovalves. Firstly, the piezoelectric actuators that can be used for driving servovalves are presented in the paper and their characteristics are thoroughly discussed. Then, the main novel architectures present in the literature are explained and compared with the commercial ones, and their performance parameters are discussed to draw conclusions on the prospect that some of these architectures can be used by manufacturers as future designs.

Subject Areas

servovalves, piezo-electric actuators, piezo-stacks, amplified piezo-stacks, rectangular benders, ring benders.

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