Elimination of thermal instability in precise positioning of Galfenol actuators

Mojtaba Ghodsi*, Khurshid Alama, Hamidreza Hoshyarmanesh, Mohammad Reza Sheykholeslami

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

This paper presents a new method to eliminate deviation in positioning caused by coil’s heat generation in magnetostrictive actuators. The advantages of the proposed system are compactness, high controllability and high reliability. The actuator package consists of Galfenol as active element and a magnification mechanism combined with a Peltier element or thermoelectric cooler (TEC). By using the temperature sensor, a thermoelectric cooler (TEC) is activated to reduce the temperature of the coil. However, the reduction of temperature by TEC alone is not enough to eliminate the error and controlling of applied voltage is also required. A simple PI controller for coil’s current is combined with TEC and by reducing the temperature and current simultaneously, the positioning error is vanished completely.
Original languageEnglish
Title of host publicationBehavior and Mechanics of Multifunctional Materials and Composites 2016
Subtitle of host publicationProceedings of SPIE
EditorsNakhiah C. Goulbourne
PublisherSPIE Press
Number of pages9
ISBN (Print)9781510600416
DOIs
Publication statusPublished - 18 Apr 2016
Event SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring - Las Vegas, United States
Duration: 20 Mar 201624 Mar 2016

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume9800
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring
Country/TerritoryUnited States
CityLas Vegas
Period20/03/1624/03/16

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