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Proceedings Paper

Simultaneous sensing and actuation of a magnetostrictive transducer
Author(s): Bernd Clephas; Hartmut Janocha
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Paper Abstract

In this paper we introduce a new approach to utilize the inherent sensor effect of a magnetostrictive actuator by evaluating the inductivity of the exciting coil. The external mechanical load on the transducer has an influence on the relative permeability of the magnetostrictive material, which causes a change in the inductivity of the coil. To determine this inductivity two different methods are proposed: integration of the transducer current to receive the magnetic flux and estimation of the electrical network parameters. These methods are both based upon a measurement of the voltage and current at the transducer and thus they are sensitive against errors or offsets. An extension of the well-known parameter identification methods can compensate for these errors leading to an unambiguous relation between the inductivity of the transducer coil and the external force. This knowledge can be used to implement a new form of a smart actuator utilizing the inherent sensor effect while actuating. The algorithms developed for magnetostrictive actuators can be directly transferred to piezoelectric and electrostrictive transducers. As application a magnetostrictive linear motor is proposed, which determines its external mechanical load without additional sensor.

Paper Details

Date Published: 27 July 1998
PDF: 11 pages
Proc. SPIE 3329, Smart Structures and Materials 1998: Smart Structures and Integrated Systems, (27 July 1998); doi: 10.1117/12.316891
Show Author Affiliations
Bernd Clephas, Univ. of Saarland (Germany)
Hartmut Janocha, Univ. of Saarland (Germany)

Published in SPIE Proceedings Vol. 3329:
Smart Structures and Materials 1998: Smart Structures and Integrated Systems
Mark E. Regelbrugge, Editor(s)

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