Author(s)

E. Santini & M. Vinci

Abstract

Invited Paper Fast and efficient techniques for interpolation of B-H curves E. Santini," M. Vinci* " Dipartimento di Ingegneria Elettrica, Universitd di Roma "La Sapienza", Via Eudossiana 18, 00184 Rome, Italy 6 Agenzia per il Mezzogiorno, Piazza Kennedy 20, ABSTRACT Methods for interpolating magnetization characteristics of saturable materials are studied. Several algorithms are studied, and for each of them mathematical theory is discussed, evidentiating difficulties and skills involved with each method. Evaluation times are shown, and numerical errors are discussed. INTRODUCTION Non-linear analysis is one of the most important tasks in FEM of power devices: in fact, active materials such as iron and permanent magnets exhibit intrinsically non- linear B-H curves. This paper analyzes the difficulties involved in dealing with numerical simulation of non-linear materials: for sake of simplicity, reference will be made to magnetostatic analysis. In general, "initial" kn

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