Simultaneous sensing and actuation of a magnetostrictive transducer

Bernd Clephas; Hartmut Janocha

doi:10.1117/12.316891

27 July 1998 Simultaneous sensing and actuation of a magnetostrictive transducer

Bernd Clephas, Hartmut Janocha

Proceedings Volume 3329, Smart Structures and Materials 1998: Smart Structures and Integrated Systems; (1998) https://doi.org/10.1117/12.316891
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

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.

Citation Download Citation

Bernd Clephas and Hartmut Janocha "Simultaneous sensing and actuation of a magnetostrictive transducer", Proc. SPIE 3329, Smart Structures and Materials 1998: Smart Structures and Integrated Systems, (27 July 1998); https://doi.org/10.1117/12.316891

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