Development and analysis of a self-sensing magnetostrictive actuator design

Jon R. Pratt; Alison B. Flatau

doi:10.1117/12.152827

8 September 1993 Development and analysis of a self-sensing magnetostrictive actuator design

Jon R. Pratt, Alison B. Flatau

Proceedings Volume 1917, Smart Structures and Materials 1993: Smart Structures and Intelligent Systems; (1993) https://doi.org/10.1117/12.152827
Event: 1993 North American Conference on Smart Structures and Materials, 1993, Albuquerque, NM, United States

Abstract

A self-sensing magnetostrictive actuator design based on a linear systems model of magnetostrictive transduction for Terfenol-D is developed and analyzed. Self-sensing, or the ability of a transducer to sense its own motion as it is being driven, has been demonstrated for electromechanical transducers such as moving voice coil loudspeakers and, most recently, piezoelectric distributed moment actuators. In these devices, self-sensing was achieved by constructing a bridge circuit to extract a signal proportional to transducer motion even as the transducer was being driven. This approach is analyzed for a magnetostrictive device. Working from coupled electromechanical magnetostrictive transduction equations found in the literature, the concept of the transducer's `blocked' electrical impedance and motional impedance are developed, and a bridge design suggested. However, results presented in this paper show that magnetostrictive transduction is inherently non-linear, and does not, therefore, lend itself well to the traditional bridge circuit approach to self-sensing.

Citation Download Citation

Jon R. Pratt and Alison B. Flatau "Development and analysis of a self-sensing magnetostrictive actuator design", Proc. SPIE 1917, Smart Structures and Materials 1993: Smart Structures and Intelligent Systems, (8 September 1993); https://doi.org/10.1117/12.152827

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