A. Sergakis, G. A. Skarmoutsos, M. Mueller and K. N. Gyftakis, “Non-Adjacent Demagnetization Detection in Direct-Drive Permanent Magnet Generators for Renewable Energy Systems”, IET Elec. Pow. Appl., accepted, 2025.

K. N. Gyftakis, M. Salinas, N. Trachalakis, Z. Song and P. A. Panagiotou, “Zero-Sequence Flux Analysis Aiming for Reliable Detection of Broken Rotor Bars in Induction Motors”, IEEE Trans. Ind. Appl., accepted, 2025.

A. Sergakis, M. Salinas, N. Gkiolekas and K. N. Gyftakis, “A Review of Condition Monitoring of Permanent Magnet Synchronous Machines: Techniques, Challenges and Future Directions”, MDPI Energies, Vol. 18, No. 5, 1177, 2025.

N. Ravanis, A. Douvaras and K. N. Gyftakis, “New Experimental-based Modelling of Traction Motor Stator Poles and Windings for Impedance Spectroscopy Analysis”, IEEE Trans. Ind. Appl., Vol. 61, No. 4, pp. 6347-6356, 2025.

P. A. Panagiotou, Z. Song, J. C. Mayo-Maldonado, I. Arvanitakis, G. Escobar, J. A. Antonino-Daviu and K. N. Gyftakis, “A Novel Harmonic Isolation Method for the Reliable Detection of Rotor Breakages in Induction Motors”, IEEE Trans. Ind. Appl., Vol. 61, No. 4, pp. 6129-6139, 2025.

J. Bonet-Jara, J. Pons-Llinares, D. Morinigo-Sotelo and K. N. Gyftakis, “New Harmonics for Early Detection of Inter-turn Faults in Induction Motors During Start-up”, IEEE Trans. Ind. Appl., Vol. 60, No. 5, pp. 6752-6760, 2024.

T. A. Garcia-Calva, K. N. Gyftakis, G. A. Skarmoutsos, M. Mueller, D. Morinigo-Sotelo and R. de J. Romero-Troncoso, “Advanced Signal Processing Techniques for Demagnetization Detection in PM Generators at Variable Speed”, IEEE Trans. Ind. Appl. Vol. 60, No. 1, pp. 174-183, 2024.

G. A. Skarmoutsos, K. N. Gyftakis, S. Ab Rasid and M. A. Mueller, “General Diagnostics in Permanent Magnet Synchronous Machines Using Two Magnetically-Coupled Search-Coils”, IEEE Trans. Ind. Appl., Vol. 60, No. 1, pp. 278-288, 2024.

K. N. Gyftakis, C. A. Platero and J. K. Nøland, “Multi-Parametric Condition Monitoring of Medium-Power Generators with Brushless Exciters under Mechanical Faults”, IEEE Trans. Ind. Appl., Vol. 60, No. 1, pp. 93-100, 2024.

H. Ehya, A. Nysveen, B. Akin and K. N. Gyftakis, “An Expeditious Algorithm for Identification and Classification of Rotor Faults in Salient Pole Synchronous Generators”, IEEE Trans. Ind. Elec., Vol. 71, No. 2, pp. 2008-2017, 2024.

K. N. Gyftakis, G. A. Skarmoutsos, I. Barajas-Solano, J. Burchell and M. Mueller, “Critical Aspects of Demagnetization Faults in Multi-Stage Direct Drive Permanent Magnet Generators for Renewables”, IEEE Trans. Ind. Appl., Vol. 59, Νo. 6, pp. 6655-6663, 2023.

S. Ab Rasid, K. N. Gyftakis, M. Mueller, “Comparative Investigation of Different Diagnostic Methods Applied to Direct Drive Permanent Magnet Machines Suffering from Demagnetization”, MDPI Energies, Vol. 16, No. 6: 2767, 2023.

P. Tian, J. M. Guerrero, C. A. Platero, S. B. Lee, K. N. Gyftakis and J. A. Antonino-Daviu, “Condition Monitoring of Rotating Diodes in Synchronous Machines through the Exciter Stray Flux Analysis”, IEEE Trans. Ind. Appl., Vol. 59, No. 3, pp. 3175-3185, 2023.

J. Bonet-Jara, J. Pons-Llinares and K. N. Gyftakis, “Comprehensive Analysis of Principal Slot Harmonics as Reliable Indicators for Early Detection of Inter-turn Faults in Induction Motors of Deep Well Submersible Pumps”, IEEE Trans. Ind. Elec., Vol. 70, No. 11, pp. 11692-11702, 2023.

K. N. Gyftakis et al., “Demagnetization Monitoring and Identification in PM Generators with Concentrated Windings During Transient Conditions”, IEEE Trans. Ind. Appl., Vol. 59, No. 2, pp. 1510-1518, 2023.

G. A. Skarmoutsos, K. N. Gyftakis and M. Mueller, “Detecting Partial Demagnetization in AFPM Generators by Monitoring Speed and EMF Induced in a Supplemental Winding”, IEEE Trans. Ind. Inf., Vol. 18, No. 5, pp. 3295-3305, 2022.

G. Skarmoutsos, K. N. Gyftakis and M. Mueller, “Analytical Prediction of the MCSA Signatures under Dynamic Eccentricity in PM Machines with Concentrated Non-overlapping Windings”, IEEE Trans. Ener. Conv., Vol. 37, No. 2, pp. 1011-1019, 2022.

K. N. Gyftakis, “A Comparative Investigation of Inter-Turn Faults in Induction Motors Suggesting a Novel Transient Diagnostic Method Based on the Goerges Phenomenon”, IEEE Trans. Ind. Appl., Vol. 58, No. 1, pp. 304-313, 2022.

A. Arvanitopoulos et al., "3C-SiC-on-Si MOSFETs: overcoming material technology limitations," IEEE Trans. Ind. Appl., 2021, Vol. 58, No. 1, pp. 565-575, 2022.

A. Arvanitopoulos et al., "Experimental and physics based study of the Schottky Barrier Height inhomogeneity and associated traps affecting 3C-SiC-on-Si Schottky Barrier Diodes," IEEE Tran. Ind. Appl., Vol. 57, No. 5, pp. 5252-5263, 2021.

H. Zhang, Z. Wen, F. Grilli, K. Gyftakis and M. Mueller, “Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines”, Energies, Vol. 14, No. 8, 2021.

D. V. Spyropoulos, P. A. Panagiotou, I. Arvanitakis, E. D. Mitronikas, and K. N. Gyftakis, “Extraction of Frequency Information for the Reliable Screening of Rotor Electrical Faults via Torque Monitoring in Induction Motors”, IEEE Trans. Ind. Appl., Vol. 57, No. 6, pp. 5949-5958, 2021.

K. N. Gyftakis, S. Rasid, G. A. Skarmoutsos and M. Mueller, “The Demagnetization Harmonics Generation Mechanism in Permanent Magnet Machines with Concentrated Windings”, IEEE Trans. Ener. Conv., Vol. 36, No. 4, pp. 2934-2944, 2021.

D. F. Kavanagh, K. N. Gyftakis and M. D. McCulloch, “Thermal Degradation Phenomena of Polymer Film on Magnet Wire for Electromagnetic Coils”, IEEE Trans. Ind. Appl., Vol. 57, No. 1, pp. 458-467, 2021.

K. N. Gyftakis, D. V. Spyropoulos and E. D. Mitronikas, “Advanced Detection of Rotor Electrical Faults in Induction Motors at Start-up”, IEEE Trans. Ener. Conv., Vol. 36, No. 2, pp. 1101-1109, 2021.

K. N. Gyftakis and A. J. M. Cardoso, “Reliable Detection of Stator Inter-Turn Faults of Very Low Severity Level in Induction Motors”, IEEE Trans. Ind. Elec., Vol. 68, No. 4, pp. 3475-3484, 2021.

S. B. Lee et all, “Condition Monitoring of Industrial Electric Machines: State of the Art and Future Challenges”, Vol. 14, No. 4, pp. 158-167, IEEE Ind. Elec. Mag., 2020.

K. N. Gyftakis, P. A. Panagiotou and D. Spyrakis, “Detection of simultaneous mechanical faults in 6 kV pumping induction motors using combined motor current signature analysis and stray flux methods”, IET Elec. Pow. Appl., Vol 15, No 5, pp. 643-652, 2021.

Y. Park, H. Choi, S. B. Lee and K. Gyftakis, “Search Coil-based Detection of Non-adjacent Rotor Bar Damage in Squirrel Cage Induction Motors”, IEEE Trans. Ind. Appl., 2020, Vol. 56, No. 5, pp. 4748-4757, 2020.

K. N. Gyftakis, P. A. Panagiotou and S. B. Lee, “Generation of Mechanical Frequency Related Harmonics in the Stray Flux Spectra of Induction Motors Suffering from Rotor Electrical Faults”, IEEE Trans. Ind. Appl., 2020, Vol. 56, No. 5, pp. 4796-4803, 2020.

C. A. Platero, J. A. Sanchez-Fernandez, K. N. Gyftakis, F. Blazquez and R. Granizo, “Performance Analysis of Non-Toroidal Shaped Current Transformers”, MDPI Sensors, Vol. 20, No. 11, 2020. 

C. A. Platero, K. N. Gyftakis, P. A. Panagiotou and A. Fernandez “Scheme for synchronous machine stator turn-to-turn protection”, IET Elec. Pow. Appl., Vol. 14, No. 4, pp. 716-722, 2020.

P. Tian, C. A. Platero, K. N. Gyftakis and J. M. Guerrero, “Stray Flux Sensor Core Impact on the Condition Monitoring of Electrical Machines”, Sensors, Vol. 23, No. 3, 2020.

A. Arvanitopoulos, M. Antoniou, M. R. Jennings, S. Perkins, K. Gyftakis, P. Mawby and N. Lophitis, “A Defects’-based model on the Barrier Height behaviour in 3C-SiC-on-Si Schottky Barrier Diodes”, IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 8, No. 1, pp. 54-65, 2020.

F. Santiago, F. Bento, A. J. Marques Cardoso and K. N. Gyftakis, “Thermal Analysis of a Directly Grid-Fed Induction Machine With Floating Neutral Point, Operating Under Unbalanced Voltage Conditions”, Electric Power Components and Systems, Vol. 47, No. 11-12, pp. 1060-1076, 2019.

K. N. Gyftakis, C. A. Platero, Y. Zhang and S. Bernal, “Diagnosis of Static Eccentricity in 3-Phase Synchronous Machines using a Pseudo Zero-Sequence Current”, Energies., Vol. 12, No. 13, article 2476, 2019.

A. Arvanitopoulos, M. Antoniou, S. Perkins, M. R. Jennings, K. N. Gyftakis and N. Lophitis, “On the suitability of 3C- Silicon Carbide as an alternative to 4H- Silicon Carbide for power diodes”, IEEE Trans. Ind. Appl., 2019, Vol. 55. No. 4, pp. 4080-4090, 2019.

P. A. Panagiotou, I. Arvanitakis, N. Lophitis , J. A. Antonino-Daviu and K. N. Gyftakis, “A New Approach for Broken Rotor Bar Detection in Induction Motors Using Frequency Extraction in Stray Flux Signals”, IEEE Trans. Ind. Appl., 2019, Vol. 55., No. 4, pp. 3501-3511, 2019.

P. A. Panagiotou, I. Arvanitakis, N. Lophitis, J. A. Antonino-Daviu and K. N. Gyftakis, “On  the  broken rotor  bar  diagnosis using  time-frequency  analysis: “Is one spectral representation enough for the characterization of monitored signals?”, IET Elec. Pow. Appl., Vol.13, No. 7, pp. 932-942, 2019.

P. A. Panagiotou, I. Arvanitakis, N. Lophitis, J. A. Antonino-Daviu and K. N. Gyftakis, “FEM approach for diagnosis of induction machines' non-adjacent broken rotor bars by short-time Fourier transform spectrogram”, IET Journal of Engineering, Vol. 2019, No. 17, pp. 4566-4570, 2019.

Y. Park, C. Yang, J. Kim, H. Kim, S. B. Lee, K. N. Gyftakis, P. A. Panagiotou, S. Hedayati Kia and G. A. Capolino, "Stray Flux Monitoring for Reliable Detection of Rotor Faults under the Influence of Rotor Axial Air Ducts", IEEE Trans. Ind. Electr., Vol. 66, no. 10, pp. 7561-7570, 2019.

M. Garcia, P. A. Panagiotou, J. A. Antonino-Daviu and K. N. Gyftakis, “Efficiency assessment of induction motors operating under different faulty conditions”, IEEE Trans. Ind. Electr., Vol. 66, No. 10, pp. 8072-8081, 2019.

M. Jeong, J. Yun, Y. Park, S. B. Lee and K. N. Gyftakis, “Quality Assurance Testing for Screening Defective Aluminum Die-cast Rotors of Squirrel Cage Induction Machines”, IEEE Trans. Ind. Appl., Vol. 53, No. 3, pp. 2246-2254, 2018.

A. S. Fawzal, R. M. Cirstea, T. J. Woolmer, M. Dickison, M. Blundell and K. N. Gyftakis, “Air Inlet and Outlet Arrangement for Rotor Cooling Application of Axial Flux Permanent Magnet Machines”, Elsevier Appl. Therm. Engin., Vol. 130, pp. 1520-1529, Feb. 2018.

D. Morinigo-Sotelo, R. J. Romero-Troncoso, P. A. Panagiotou, J. A. Antonino-Daviu and K. N. Gyftakis, “Reliable Detection of Broken Rotor Bars in Induction Motors via MUSIC and ZSC Methods”, IEEE Trans. Ind. Appl., Vol. 54, No. 2, pp. 1224 – 1234, 2018.

A. Arvanitopoulos, N. Lophitis, K. Gyftakis, S. Perkins and M. Antoniou, "Validated physical models and parameters of bulk 3C-SiC aiming for credible Technology Computer Aided Design (TCAD) simulation", IOP Semiconductor Science and Technology, Vol. 32, No. 10, 2017.

K. N. Gyftakis, A. J. M. Cardoso and J. A. Antonino-Daviu, “Introducing the Filtered Park’s and Filtered Extended Park’s Vector Approach to Detect Broken Rotor Bars in Induction Motors Independently from the Rotor Slots Number”, Elsevier Mechanical Systems and Signal Processing, Vol. 93, pp. 30-50, 2017.

A. S. Fawzal, R. M. Cirstea, K. N. Gyftakis, T. J. Woolmer, M. Dickison, M. Blundell, “Fan Performance Analysis for Rotor Cooling of Axial Flux Permanent Magnet Machines”, IEEE Trans. Ind. Appl., Vol. 53, No. 4, pp. 3295-3304, 2017.

N. Halem, S. E. Zouzou, K. Srairi and K. N. Gyftakis, “FEM Analysis for Comparative Investigation of The Stator Circuit Connection Impact on The Induction Motor Broken Bar Fault Higher Order Signatures”, International Journal on Electrical Engineering and Informatics, Vol. 8, No. 4, pp. 739-752, Dec. 2016.

A. Garcia-Perez, J. P. Amezquita-Sanchez, D. Morinigo-Sotelo, and K. N. Gyftakis, “Vibration Analysis as a Diagnosis Tool for Health Monitoring of Industrial Machines,” Shock and Vibration, Vol. 2016, 2 pages, 2016. (Editorial)

M. Sumislawska, K. N. Gyftakis, D. F. Kavanagh, M. McCulloch, K. J. Burnham and D. A. Howey, “The Impact of Thermal Degradation on Properties of Electrical Machine Winding Insulation Material”, IEEE Trans. Ind. Appl., Vol. 52, No. 4, pp. 2951-2960, 2016.

K. N. Gyftakis, J. A. Antonino-Daviu, R. Garcia-Hernandez, M. McCulloch, D. A. Howey and A. J. M. Cardoso, “Comparative Experimental Investigation of the Broken Bar Fault Detectability in Induction Motors”, IEEE Trans. Ind. Appl., Vol. 52, No. 2, pp. 1452-1459, 2016.

K. N. Gyftakis, M. Sumislawska, D. F. Kavanagh, D. A. Howey and M. McCulloch, “Dielectric Characteristics of Electric Vehicle Traction Motor Winding Insulation under Thermal Ageing”, IEEE Trans. Ind. Appl.,Vol. 52, No. 2, pp. 1398-1404, 2016.

J. Kim, S. Shun, S. B. Lee, K. N. Gyftakis, M. Drif and A. M. Cardoso, “Power Spectrum-based Detection of Induction Motor Rotor Faults for Immunity to False Alarms”, IEEE Trans. Ener. Conv., Vol. 30, No. 3, pp. 1123-1132, Sep. 2015.

K. N. Gyftakis, I. Katsantonis and J. Kappatou, “Optimization of the Electromagnetic Characteristics of a 3-phase Squirrel Cage Induction Motor using FEM”, Journal of Materials Science and Engineering A, Vol. 4, No. 3, pp. 65-72, 2014

K. N. Gyftakis and J. Kappatou, “The Zero-Sequence Current as a Generalized Diagnostic Mean in Δ-Connected Induction Motors,” IEEE Trans. Ener. Conv., Vol. 29, No. 1, pp. 138-148, Mar. 2014.

K. N. Gyftakis, P. A. Panagiotou and J. Kappatou, “Application of Wedges for the Reduction of the Space and Time-Dependent Harmonic Content in Squirrel-Cage Induction Motors,” Hindawi Publishing Corporation Journal of Computational Engineering, Volume 2013, 9 pages.

K. N. Gyftakis and J. Kappatou, "A Novel and Effective Method of Static Eccentricity Diagnosis in 3-Phase, PSH-Induction Motors", IEEE Trans. Ener. Conv., Vol. 28, No. 2, pp. 405-412, Jun. 2013.

K. N. Gyftakis, D. V. Spyropoulos, J. Kappatou and E. D. Mitronikas, "A Novel Approach for Broken Bar Fault Diagnosis in Induction Motors through Torque Monitoring", IEEE Trans. Ener. Conv., Vol. 28, No. 2, pp. 267-277, Jun. 2013.

K. N. Gyftakis and J. Kappatou, “The Impact of the Rotor Slot Number on the Behaviour of the Induction Motor,” Hindawi, Advances in Power Electronics, vol. 2013, 9 pages, 2013. 

J. Kappatou, K. N. Gyftakis, A. N. Safakas, “Investigation of the stator semi-magnetic wedges influences on the behaviour of a Cage Asynchronous Motor through time stepping Finite Element Analysis”, International Review of Electrical Engineering, Praise Worthy Prize Publications, Vol. 6, No. 1, Part A, pp 285-291, Feb. 2011.

K. N. Gyftakis, J. Kappatou, A. N. Safakas, “Study of Asynchronous Motors with asymmetrical rotor slots under FEM steady-state analysis’’, International Review of Electrical Engineering, Praise Worthy Prize Publications, Vol. 5, No. 6, Part A, pp 2601-2609, Dec. 2010.

J. Kappatou, K. Gyftakis, A. Safakas, “FEM Study of the rotor slot design influences on the Induction Machine characteristics”, Studies in Applied Electromagnetics and Mechanics, Volume 30, Advanced Computer Techniques in Applied Electromagnetics, IOS Press, pp. 247-252, 2008.