Conference papers

  1. G. D. Kalokiris, T. D. Kefalas, A. G. Kladas, and J. A. Tegopoulos, “Special air-gap element for 2D FEM analysis of electrical machines accounting for rotor skew,”Proceedings of the 11th Biennial IEEE Conference on Electromagnetic Field Computation CEFC 2004, pp. 357, Seoul, Korea, June 6-9, 2004.
  2. T. D. Kefalas, M. A. Tsili, A. G. Kladas, P. S. Georgilakis, A. T. Souflaris, and D. G. Paparigas, “Power transformer no load loss optimization considering manufacturing process effects,” Proceedings of the 12th Biennial IEEE Conference on Electromagnetic Field Computation CEFC 2006, pp. 370, Miami FL, USA, April 30 – May 3, 2006.
  3. 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,”Proceedings of the 16th Biennial IEEE Conference on Computation of Electromagnetic Fields COMPUMAG 2007, Aachen, Germany, June 24-28, 2007.
  4. G. Loizos, T. Kefalas, A. Kladas, T. Souflaris, and D. Paparigas, “Flux distribution and power loss analysis in single phase, Si-Fe, wound transformer cores,” Proceedings of the 18th Conference on Soft Magnetic Materials SMM18, Cardiff, Wales, United Kingdom, September 2-5, 2007.
  5. T. D. Kefalas, M. A. Tsili, and A. G. Kladas, “Unification of anisotropy and FEM-BE models for distribution transformer optimization,” Proceedings of the 5th Japanese – Mediterranean Workshop on Applied Electromagnetic Engineering for Magnetic Superconducting and Nano Materials JAPMED5, Larnaca, Cyprus, September 16-19, 2007.
  6. T. D. Kefalas and A. G. Kladas, “FEM package for iron loss evaluation and minimization of two grade lamination wound cores,” Proceedings of the 5th Japanese – Mediterranean Workshop on Applied Electromagnetic Engineering for Magnetic Superconducting and Nano Materials JAPMED5, Larnaca, Cyprus, September 16-19, 2007.
  7. T. D. Kefalas and A. G. Kladas, “Nonlinear FE analysis considering hysteresis of wound core transformers under distorted supply voltage conditions,” Proceedings of the 13th Biennial IEEE Conference on Electromagnetic Field Computation CEFC 2008, Athens, Greece, May 11-15, 2008.
  8. T. D. Kefalas and A. G. Kladas, “Robust numerical analysis of wound core distribution transformers,” Proceedings of the 18th International Conference on Electrical Machines ICEM 2008, Vilamoura, Portugal, September 6-9, 2008.
  9. T. D. Kefalas and A. G. Kladas, “A new technique for reducing the total owning cost of wound core distribution transformers,” Proceedings of the 6th Mediterranean Conference and Exhibition on Power Generation, Transmission and Distribution MedPower 2008, Thessaloniki, Greece, November 2-5, 2008.
  10. T. Kefalas, G. Loizos, and A. Kladas, “Normal flux distribution at step-lap joints of Si-Fe wound cores,” Proceedings of the 6th Japanese – Mediterranean Workshop on Applied Electromagnetic Engineering for Magnetic Superconducting and Nano Materials JAPMED6, Bucharest, Romania, July 27-29, 2009.
  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,” Proceedings of the 6th Japanese – Mediterranean Workshop on Applied Electromagnetic Engineering for Magnetic Superconducting and Nano Materials JAPMED6, Bucharest, Romania, July 27-29, 2009.
  12. G. Loizos, T. D. Kefalas, A. G. Kladas, and A. T. Souflaris, “Flux distribution analysis in three phase, Si-Fe wound transformer cores,” Proceedings of the 19th Conference on Soft Magnetic Materials SMM19, Torino, Italy, September 6-9, 2009.
  13. M. E. Beniakar, T. D. Kefalas, and A. G. Kladas, “Permanent magnet motor damping analysis by using a particular 2D FEM technique,” Proceedings of the 17th Biennial IEEE Conference on Computation of Electromagnetic Fields COMPUMAG 2009, Florianopolis, Brazil, November 22-26, 2009.
  14. T. D. Kefalas, G. Loizos, and A. G. Kladas, “Transformer joints FE analysis using pseudo-source technique,” Proceedings of the 14th Biennial IEEE Conference on Electromagnetic Field Computation CEFC 2010, Chicago IL, USA, May 9-12, 2010.
  15. T. D. Kefalas, G. Loizos, and A. G. Kladas, “Generalized representation of transformer electrical steels working under heavily saturated conditions,” Proceedings of the 19th International Conference on Electrical Machines ICEM 2010, Rome, Italy, September 6-8, 2010.
  16. T. Kefalas, A. Kladas, Μ. Τsili, Ε. Amoiralis, P. Georgilakis, G. Loizos, and A. Souflaris, “Energy conservation by low loss distribution transformers adapted to load characteristics,” Proceedings of the 5th International Conference on Deregulated Electricity Market issues in South-Eastern Europe DEMSEE 2010, Sitia, Greece, September 23-24, 2010.
  17. T. D. Kefalas and A. G. Kladas, “Advanced computational tools for wound core distribution transformer no-load analysis,” Proceedings of the 3rd International Advanced Research Workshop on transformers ARWtr 2010, Santiago de Compostela, Spain, October 3-6, 2010.
  18. T. D. Kefalas and A. G. Kladas, “Grid voltage harmonics effect on distribution transformer operation,” Proceedings of the 7th Mediterranean Conference and Exhibition on Power Generation, Transmission and Distribution MedPower 2010, Agia Napa, Cyprus, November 7-10, 2010.
  19. 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,” Proceedings of the 7th Japanese – Mediterranean Workshop on Applied Electromagnetic Engineering for Magnetic Superconducting and Nano Materials JAPMED7, Budapest, Hungary, July 6-9, 2011.
  20. T. D. Kefalas and A. G. Kladas, “Reduction of power grid losses by using energy efficient distribution transformers,” Proceedings of the 7th Japanese – Mediterranean Workshop on Applied Electromagnetic Engineering for Magnetic Superconducting and Nano Materials JAPMED7, Budapest, Hungary, July 6-9, 2011.
  21. T. D. Kefalas and A. G. Kladas, “Development of distribution transformers assembled of composite wound cores,” Proceedings of the 18th Biennial IEEE Conference on Computation of Electromagnetic Fields COMPUMAG 2011, Sydney, Australia, July 12-15, 2011.
  22. T. D. Kefalas and A. G. Kladas, “Mixed Si-Fe wound cores five legged transformer: Losses and flux distribution analysis,” Proceedings of the 20th International Conference on Soft Magnetic Materials SMM20, Kos, Greece, September 18-22, 2011.
  23. T. D. Kefalas and A. G. Kladas, “Finite element transient thermal analysis of PMSM for aerospace applications,” Proceedings of the 20th International Conference on Electrical Machines ICEM 2012, Marseille, France, September 2-5, 2012.
  24. T. D. Kefalas and A. G. Kladas, “PMSM operation under severe thermodynamic environments and rapid load conditions,Proceedings of the 15th Biennial IEEE Conference on Electromagnetic Field Computation CEFC 2012, Oita, Japan, November 11-14, 2012.
  25. K. Dimolikas, T. D. Kefalas, P. Karaisas, Z. K. Papazacharopoulos, and A. G. Kladas, “Lumped-parameter network thermal analysis of permanent magnet synchronous motor,”Proceedings of the 8th Japanese – Mediterranean Workshop on Applied Electromagnetic Engineering for Magnetic Superconducting and Nano Materials JAPMED8, Athens, Greece, June 23-26, 2013.
  26. T. D. Kefalas and A. G. Kladas, “Finite element transient analysis of induction and permanent magnet motors for aerospace applications,” Proceedings of the 16th Biennial IEEE Conference on Electromagnetic Field Computation CEFC 2014, Annecy, France, May 25-28, 2014.
  27. T. D. Kefalas and A. G. Kladas, “Reduction of cost and losses of transformers by using composite magnetic cores,” Proceedings of the 21st International Conference on Electrical Machines ICEM 2014, Berlin, Germany, September 2-5, 2014.
  28. T. D. Kefalas and A. G. Kladas, “Analysis of induction and permanent magnet motors for aerospace applications using multiple slices FE technique and pseudo-cooling thermal boundary conditions,” Proceedings of the 20th Biennial IEEE Conference on Computation of Electromagnetic Fields COMPUMAG 2015, Montreal, Quebec, Canada, June 28 – July 2, 2015.
  29. T. D. Kefalas and A. G. Kladas, “3D FEM and lumped-parameter network transient thermal analysis of induction and permanent magnet motors for aerospace applications,” Proceedings of the 9th Japanese – Mediterranean Workshop on Applied Electromagnetic Engineering for Magnetic Superconducting and Nano Materials JAPMED9, Sofia, Bulgaria, July 5-8, 2015.
  30. T. D. Kefalas and A. G. Kladas, “Transient heat transfer analysis of housing and PMM using 3–D FE code,” Proceedings of the 22nd International Conference on Electrical Machines ICEM 2016, Lausanne, Switzerland, September 4-7, 2016.

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