A STRONG COUPLED MODEL FOR ANALYZING DYNAMIC BEHAVIORS OF NONLINEAR ELECTROMECHANICAL SYSTEMS

A strong coupled model solving simultaneously electric circuit, magnet ic field and mechanical motion equations is presented. The magnetic fi eld is solved by a formulation in terms of magnetic vector potential. The working variable in mechanical equation can be either the displace ment or the velocity. The magnetic force is calculated by the virtual work method associated with the edge element. The non-linear system is solved by Newton-Raphson method. The final matrix equation is symmetr ized. A numerical example shows that, compared with a conventional seq uential coupling model, the convergence of the present method is less dependent on time step values.