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Effect of multilevel inverter supply on core losses in magnetic materials and electrical machines

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Abstract
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 similar 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.
Keywords
magnetic hysteresis, magnetic materials, iron loss, finite-element analysis, excess loss, Eddy currents, electrical machines, multilevel converter, pulse width modulation, MODULATION

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Chicago
Rasilo, Paavo, Aboubakr Salem Mohamed Salem, Ahmed Mohamed Abouelyazied Abdallh, Frederik De Belie, Luc Dupré, and Jan Melkebeek. 2015. “Effect of Multilevel Inverter Supply on Core Losses in Magnetic Materials and Electrical Machines.” Ieee Transactions on Energy Conversion 30 (2): 736–744.
APA
Rasilo, P., Salem Mohamed Salem, A., Mohamed Abouelyazied Abdallh, A., De Belie, F., Dupré, L., & Melkebeek, J. (2015). Effect of multilevel inverter supply on core losses in magnetic materials and electrical machines. IEEE TRANSACTIONS ON ENERGY CONVERSION, 30(2), 736–744.
Vancouver
1.
Rasilo P, Salem Mohamed Salem A, Mohamed Abouelyazied Abdallh A, De Belie F, Dupré L, Melkebeek J. Effect of multilevel inverter supply on core losses in magnetic materials and electrical machines. IEEE TRANSACTIONS ON ENERGY CONVERSION. 2015;30(2):736–44.
MLA
Rasilo, Paavo et al. “Effect of Multilevel Inverter Supply on Core Losses in Magnetic Materials and Electrical Machines.” IEEE TRANSACTIONS ON ENERGY CONVERSION 30.2 (2015): 736–744. Print.
@article{8026331,
  abstract     = {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 similar 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.},
  author       = {Rasilo, Paavo and Salem Mohamed Salem, Aboubakr and Mohamed Abouelyazied Abdallh, Ahmed and De Belie, Frederik and Dupré, Luc and Melkebeek, Jan},
  issn         = {0885-8969},
  journal      = {IEEE TRANSACTIONS ON ENERGY CONVERSION},
  keywords     = {magnetic hysteresis,magnetic materials,iron loss,finite-element analysis,excess loss,Eddy currents,electrical machines,multilevel converter,pulse width modulation,MODULATION},
  language     = {eng},
  number       = {2},
  pages        = {736--744},
  title        = {Effect of multilevel inverter supply on core losses in magnetic materials and electrical machines},
  url          = {http://dx.doi.org/10.1109/TEC.2014.2372095},
  volume       = {30},
  year         = {2015},
}

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