Theory development, improvement of mathematical models, investigation of electric machines and electromechanical systems - L. I. Mazurenko; V. V. Hrebenikov; O. V. Dzhura; O. M. Popovych; O. V. Bibik; I. V. Holovan; Yu. V. Shurub; V. I. Romanenko (Proceedings of the Institute of Electrodynamics of the National Academy of Sciences of Ukraine, 2014)