Browsing by Author "Melkebeek, Jan A."

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  • Closure to Discussion on “Effect of Multilevel Inverter Supply on Core Losses in Magnetic Materials and Electrical Machines”
    (2015) Rasilo, Paavo; Salem, Aboubakr; Abdallh, Ahmed; Belie, Frederik De; Dupre, Luc; Melkebeek, Jan A.
     School of Electrical Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
  • Effect of Multilevel Inverter Supply on Core Losses in Magnetic Materials and Electrical Machines
    (2015) Rasilo, Paavo; Salem, Aboubakr; Abdallh, Ahmed; De Belie, Frederik; Dupre, Luc; Melkebeek, Jan A.
     School of Electrical Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    The effect of multilevel inverter supply on power losses in magnetic cores and electrical machines is studied. A dynamic numerical model for the hysteresis, eddy current, and excess losses in a core lamination is first developed. By both measurements and simulations for a ring-core inductor, we demonstrate how increasing the number of inverter voltage levels decreases the iron losses when compared with traditional two-level supply. Although the switching frequency has a significant impact on the iron losses in the case of a traditional two-level inverter, using three or five voltage levels makes the losses almost independent of the switching. Finally, finite-element simulations show that simi-lar reductions are also possible for the core losses of 150-kVA and 12.5-MW wound-field synchronous machines, in which rather low switching frequencies are typically used. Calorimetric loss measurements are also presented for the 150-kVA machine in order to confirm the significant effect of switching frequency on the core losses with two-level inverter supply.