Journal papers

  1. G. D. Kalokiris, T. D. Kefalas, A. G. Kladas, and J. A. Tegopoulos, “Special air-gap element for 2-D FEM analysis of electrical machines accounting for rotor skew,” IEEE Transactions on Magnetics, vol. 41, no 5, pp. 2020-2023, May 2005.
  2. T. Kefalas, G. Kalokiris, A. Kladas, and J. Tegopoulos, “Design of skewed mounted permanent magnet synchronous generators based on 2D and 3D finite element techniques,” Journal of Materials Processing Technology, vol. 161, pp. 288-293, 2005.
  3. E. I. Amoiralis, P. S. Georgilakis, T. D. Kefalas, M. A. Tsili, and A. G. Kladas, “Artificial intelligence combined with hybrid FEM-BE techniques for global transformer optimization,” IEEE Transactions on Magnetics, vol. 43, no. 4, pp. 1633-1636, Apr. 2007.
  4. T. Kefalas, M. Tsili, and A. Kladas, “Unification of anisotropy and FEM-BE models for distribution transformer optimization,” Journal of Optoelectronics and Advanced Materials, vol. 10, no. 5, pp. 1143-1148, May 2008.
  5. T. Kefalas and A. Kladas, “FEM package for iron loss evaluation and minimization of two grade lamination wound cores,” Journal of Optoelectronics and Advanced Materials, vol. 10, no. 5, pp. 1197-1202, May 2008.
  6. T. D. Kefalas, P. S. Georgilakis, A. G. Kladas, A. T. Souflaris, and D. G. Paparigas, “Multiple grade lamination wound core: A novel technique for transformer iron loss minimization using simulated annealing with restarts and an anisotropy model,” IEEE Transactions on Magnetics, vol. 44, no. 6, pp. 1082-1085, Jun. 2008.
  7. G. Loizos, T. Kefalas, A. Kladas, T. Souflaris, and D. Paparigas, “Flux distribution in single phase, Si-Fe, wound transformer cores,” Journal of Magnetism and Magnetic Materials, vol. 320, pp. 874-877, 2008.
  8. T. D. Kefalas, “Transformers made of composite magnetic cores: An innovative design approach,” Journal of Recent Patents on Electrical Engineering, vol. 2, no. 1, pp. 1-12, 2009.
  9. T. D. Kefalas and A. G. Kladas, “Harmonic impact on distribution transformer no-load loss,” IEEE Transactions on Industrial Electronics, vol. 57, no. 1, pp. 193-200, Jan. 2010.
  10. G. Loizos, T. D. Kefalas, A. G. Kladas, and A. T. Souflaris, “Flux distribution analysis in three-phase Si-Fe wound transformer cores,” IEEE Transactions on Magnetics, vol. 46, no. 2, pp. 594-597, Feb. 2010.
  11. M. Beniakar, T. Kefalas, and A. Kladas, “Investigation of the impact of the operational temperature on the performance of a surface permanent magnet motor,” Journal of Materials Science Forum, vol. 670, pp. 259-264, 2011.
  12. T. Kefalas, G. Loizos, and A. Kladas, “Normal flux distribution at step-lap joints of Si-Fe wound cores,” Journal of Materials Science Forum, vol. 670, pp. 284-290, 2011.
  13. T. D. Kefalas, G. Loizos, and A. G. Kladas, “Transformer joints FE analysis using pseudo-source technique,” IEEE Transactions on Magnetics, vol. 47, no. 5, pp. 1058-1061, May 2011.
  14. T. D. Kefalas and A. G. Kladas, “Advanced computational tools for wound core distribution transformer no-load analysis,” COMPEL, vol. 31, no. 2, pp. 682-691, 2012.
  15. T. D. Kefalas and A. G. Kladas, “Development of distribution transformers assembled of composite wound cores,” IEEE Transactions on Magnetics, vol. 48, no. 2, pp. 775-778, Feb. 2012.
  16. T. D. Kefalas and A. G. Kladas, “Mixed Si–Fe wound cores five legged transformer: Losses and flux distribution analysis,” IEEE Transactions on Magnetics, vol. 48, no. 4, pp. 1609-1612, Apr. 2012.
  17. T. D. Kefalas and A. G. Kladas, “Analysis of transformers working under heavily saturated conditions in grid-connected renewable energy systems,” IEEE Transactions on Industrial Electronics, vol. 59, no. 5, pp. 2342-2350, May 2012.
  18. T. D. Kefalas, Z. K. Papazacharopoulos, and A. G. Kladas, “Experimental and theoretical analysis of iron losses of electrical steels subjected to distorted supply voltage waveform conditions,” Journal of Materials Science Forum, vol. 721, pp. 171-176, 2012.
  19. T. D. Kefalas and A. G. Kladas, “Reduction of power grid losses by using energy efficient distribution transformers,” Journal of Materials Science Forum, vol. 721, pp. 269-274, 2012.
  20. T. D. Kefalas and A. G. Kladas, “Thermal investigation of permanent magnet synchronous motor for aerospace applications,” IEEE Transactions on Industrial Electronics, vol. 61, no. 8, pp. 4404-4411, Aug. 2014.
  21. K. Dimolikas, T. D. Kefalas, P. Karaisas, Z. K. Papazacharopoulos, and A. G. Kladas, “Lumped-parameter network thermal analysis of permanent magnet synchronous motor,” Journal of Materials Science Forum, vol. 792, pp. 233-238, 2014.
  22. T. D. Kefalas and A. G. Kladas, “3-D FEM and lumped-parameter network transient thermal analysis of induction and permanent magnet motors for aerospace applications,” Journal of Materials Science Forum, vol. 856, pp. 245-250, 2016.

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