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Proceedings Paper

Latching valve control using ferromagnetic shape memory alloy actuators
Author(s): Andries J. du Plessis; Alexander W. Jessiman; Gert J. Muller; Marthinus C. van Schoor
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Paper Abstract

Ferromagnetic Shape Memory Alloys (FSMA) are a class of active materials based on nickel alloys which offer controllable, large mechanical straining based on applied mechanical stress and magnetic fields. Actuation is based on crystallographic switching between meta-stable martensite phases. The high speed, binary switching, and no power hold behavior of the FSMA material are particularly well suited for latching valve applications such as hydraulic valves, optical switches, and electromechanical relays. This paper describes the design, development, and testing of a FSMA based actuator system to drive an industrial, hydraulic, latching valve. An opposing actuator configuration is used to switch the valve spool between spool positions, as well as to reset the opposing actuator element. Specific issues addressed in the design include FSMA material strain modeling, spool movement modeling, magnetic driving coil design and circuit controller design. A prototype system, based on a commercially available latching valve platform, was constructed and tested. Size of the complete system, including two FSMA actuators, valve body, and spool is 19 × 19 × 89 mm. Maximum valve actuation frequency of the prototype system is 133Hz in a 1000 psi hydraulic test bed.

Paper Details

Date Published: 14 August 2003
PDF: 12 pages
Proc. SPIE 5054, Smart Structures and Materials 2003: Industrial and Commercial Applications of Smart Structures Technologies, (14 August 2003); doi: 10.1117/12.483897
Show Author Affiliations
Andries J. du Plessis, Mide Technology Corp. (United States)
Alexander W. Jessiman, Mide Technology Corp. (United States)
Gert J. Muller, Mide Technology Corp. (United States)
Marthinus C. van Schoor, Mide Technology Corp. (United States)

Published in SPIE Proceedings Vol. 5054:
Smart Structures and Materials 2003: Industrial and Commercial Applications of Smart Structures Technologies
Eric H. Anderson, Editor(s)

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