Magnetostrictive unimorph transducer network model

Abstract

A new rotational magnetomechanical transducer network model for a magnetostrictive unimorph is presented. Often these laminated structures define an operating point about which the mechanical, magnetic and electrical quantities show only small variations and the behavior can be decribed by a linear model. It is shown how the magnetomechanical transduction coefficient in actuation direction, which is obtained via classical laminated plate theory, holds also for the sensing relation. The magnetomechanical model is combined with electromagnetic coil models. The electromagnetic and the magnetomechanical transducer are connected by a magnetic voltage divider which takes demagnetization or the planar coil field distribution into account. The presented models can be used for a fast analysis of existing systems and also for the optimization of new designs. The resulting circuit description can be simplified, e.g. to a single impedance, by transforming network elements into other domains.