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The performance prediction of micro-generators based on the Villari effect is a task which involved engineers and physicists in the last years. A number of approaches have been proposed, ranging from the linear one to those including non-linearity and hysteresis, up to phenomenological approaches. The present work particularly focuses on a hysteretic approach derived from a model successfully experimented for the analysis of magneto-mechanical actuators and based on the implementation of stress-dependent hysteretic model within a finite element procedure. The paper presents the validation of the proposed approach, and its effectiveness in the characterization of the generator.