In this paper an integral formulation for the analysis of electromagnetic fields distribution in systems with bodies in motion is presented. This formulation is Based on the subdivision of conductive and ferromagnetic regions in elementary volumes in which a uniform distribution of current density J and magnetization M is assumed. By integrating in every volume Ohm's law in term of the magnetic vector potential produced by the conduction and magnetization currents we obtain an equivalent electric network whose lumped parameters vary during every time step interval as the moving parts of the system change their positions.The proposed model has been tested by comparison with andytienl solutions.

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In this paper a frequency domain formulation of the method of moments taking into account the presence of ferromagnetic materials is presented.By combining tlie electric ficld definition, Ohm's 1:inz and Lorentz gauge inside e~e r y volume element into which the system is subdivided, :I linc:ir algebraic system of integriil equations is obt;iined. Considering the nonlinear constitutit,e equation H=H(B) :ind the magnetization M a nonlinc:ir algcbraic system of equations is obtained. The unknowns of these systems arc tlic timc Fourier transforms of magnetizations ;itit1 conduction currents. The solution of these systems for a finitc number of harmonics gives the frequency domain solution of the pro1)lcm. The use of pulse functions tis subsection b;ises allows a quick matrix set up especially when regular volume shapes are selected. Calculated results are compared with results obtnincd with other methogs.

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