Affiliations: [a] Dipartimento di Ingegneria Elettrica, University di
Napoli Federico II, Napoli, Italy | [b] Ansaldo Energia, Genova, Italy | [c] Dipartimento di Ingegneria dell'Informazione, Seconda
Università di Napoli, Aversa (CE), Italy | [d] DIEI, Dipartimento di Ingegneria Elettrica e
dell'Informazione, Università di Cassino, Italy
Correspondence:
[*]
Corresponding author: R. Martone, Dip. Ingegneria Industriale e
della Informazione, Seconda Università di Napoli, via Roma 29, I-81031
Aversa (CE), Italy. Tel.: +39 081 5010209; Fax: +39 081 5037042; E-mail:
Raffaele.Martone@unina2.it
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.
Keywords: Electromagnetic integral formulation, movement treatment, synchronous generator
