Abstract
A critical aspect of the 3D electromechanical analysis of rotating machinery is the treatment of motion. The paper proposes a technique taking advantage of the numerical characteristics of integral formulations. The motion can be "naturally" modelled because no mesh in the free space and, consequently, in the air gap is required. A frequency domain procedure is presented. It exploits a fixed point iteration technique to deal with magnetic nonlinearities. The procedure is able to determine a periodic steady state solution of a magneto quasi-static problem with both motional and trasformatoric effects. In order to highlight the effectiveness and the general validity of the approach, some numerical examples are presented, including the calculation of 3D Lorentz force density waveforms in massive non magnetic regions of a large turbine generator.