Coupled magnetoelastic finite element formulation including anisotropic reluctivity tensor and magnetostriction effects for machinery applications

This paper presents a generalized 2-D tensor finite element model, which ca n be used to evaluate force components in electromagnetic devices including those due to the magnetostrictive phenomenon. Magnetostriction is a proper ty of ferrous alloys in which the material will exhibit strain in the prese nce of magnetic field. This strain is in addition to any other strains that might exist as a result of electrical and/or mechanical forces. At low fre quencies, magnetostrictive forces are undesirable. These forces can be larg e and generate acoustic noise in electromagnetic systems. Implementation re sults on a 2-hp, permanent magnet motor show that magnetostrictive forces a re significant and amount to more than 50% force level increase above elect romechanical force levels obtained without accounting for magnetostriction.