Calculation of eddy currents in moving structures using a finite element method on non matching grids

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Cal ulation of eddy urrents in moving stru tures using a nite element method on non-mat hing grids F. Rapetti L. Santandrea F. Bouillault A. Razek Abstra t This paper deals with the numeri al simulation of eddy urrent distributions in non-stationary geometries with sliding interfa es. We study a system omposed of two solid parts: a xed one (stator) and a moving one (rotor) whi h slides in onta t with the former. We also onsider a two dimensional mathemati al model based on the transverse ele tri formulation of the eddy urrent problem whose approximation is performed via the mortar element method ombined with the standard linear nite element dis retization in spa e and an impli it rst order Euler s heme in time. Numeri al results underline the in uen e of the rotor movement on the urrent distribution and give an estimate of the power losses with respe t to the rotor angular speed. Key words. eddy urrent problem, moving stru tures, nite element approximation on non- mat hing grids, domain de omposition method Introdu tion The omputation of the spa e and time distribution of the indu ed urrents in ele tromagneti systems is of great importan e for performan e predi tion and devi e design. Generated in ondu ting materials, their ee ts are positive in indu tion engines for propulsion for es but negative in transformers for energy losses in heat form.

  • transverse ele

  • has been

  • omposition method

  • problem

  • tri formulation

  • standard galerkin

  • been proved


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