This paper proposes a novel architecture for the pilot stage of electro-hydraulic two-stage servovalves that does not need a quiescent flow and a torque motor as well as a flexure tube to operate. The architecture consists of two small piezoelectric valves, coupled with two fixed orifices, which allow variation of the differential pressure at the main stage spool extremities in order to move it with high response speed and accuracy. Each piezoelectric valve is actuated by a piezoelectric ring bender, which exhibits much greater displacement than a stack actuator of the same mass, and greater force than a rectangular bender. The concept is intended to reduce the influence of piezoelectric hysteresis. In order to assess the validity of the proposed configuration and its controller in terms of spool positioning accuracy and dynamic response, detailed simulations are performed by using the software Simscape Fluids. At 50% amplitude the −90° bandwidth is about 150Hz.
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BATH/ASME 2018 Symposium on Fluid Power and Motion Control
September 12–14, 2018
Bath, UK
Conference Sponsors:
- Fluid Power Systems and Technology Division
ISBN:
978-0-7918-5196-8
PROCEEDINGS PAPER
A Novel Piezoelectric Double-Flapper Servovalve Pilot Stage: Operating Principle and Performance Prediction
Paolo Tamburrano,
Paolo Tamburrano
University of Bath, Bath, UK
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Riccardo Amirante,
Riccardo Amirante
Polytechnic University of Bari, Bari, Italy
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Elia Distaso,
Elia Distaso
Polytechnic University of Bari, Bari, Italy
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Andrew R. Plummer
Andrew R. Plummer
University of Bath, Bath, UK
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Paolo Tamburrano
University of Bath, Bath, UK
Riccardo Amirante
Polytechnic University of Bari, Bari, Italy
Elia Distaso
Polytechnic University of Bari, Bari, Italy
Andrew R. Plummer
University of Bath, Bath, UK
Paper No:
FPMC2018-8864, V001T01A032; 10 pages
Published Online:
November 20, 2018
Citation
Tamburrano, P, Amirante, R, Distaso, E, & Plummer, AR. "A Novel Piezoelectric Double-Flapper Servovalve Pilot Stage: Operating Principle and Performance Prediction." Proceedings of the BATH/ASME 2018 Symposium on Fluid Power and Motion Control. BATH/ASME 2018 Symposium on Fluid Power and Motion Control. Bath, UK. September 12–14, 2018. V001T01A032. ASME. https://doi.org/10.1115/FPMC2018-8864
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