Modelling of a TERFENOL-D based electric generators
A linear model for an electric generator based in TERFENOL-D is developed. In order to do so, a deep study of the magnetostriction and the magnetization processes is carried out first. Secondly, mathematical expressions for the output of the generator are developed, considering two different kinds of excitations, one where the applied stress is expressed in an exponential way, and another one where it is expressed in a periodic way. A Lump Parameters Model, where the material properties are considered as constants, is analyzed. As an improvement, a second model is developed, where the material properties are considered as functions of the mechanical and magnetic solicitation of the magnetostrictive material. A comparison between both models and both inputs is realized.