Large A.C. Machines

Problems formulation.- Investigation methods of performance characteristics for double-fed machines with converter in rotor circuit. Summary of main investigation stages of A.C. machines.- Stator MMF harmonics at non-sinusoidal machine power supply (for m 1, O 1).- Peculiarities of currents investigation in magnetically coupled circuits for A.C. machines with short-circuited rotor windings.- Representation of currents in rotor short-circuited winding elements in the form of generalized characteristics.- Passive quadripoles; recurrent circuits of various structure. Investigation of their peculiarities for modeling process of currents distribution in short-circuited rotor windings.- Active symmetrical and asymmetrical chain circuits. Investigation of their peculiarities for modeling process of currents distribution in short-circuited rotor windings.- EMF induced by resulting field in short-circuited loops of damper winding and squirrel cage.- Investigation methods of currents distribution in regular damper windings and squirrel cages.- Investigation methods of currents distribution in squirrel cages with asymmetry.- Investigation methods of currents distribution in irregular damper windings.- MMF of damper winding, squirrel cage (at asymmetry in them or at its absence) and excitation winding. Representation of MMF in the form of harmonic series in complex plane.- Field harmonics in air gap of A.C. machine in nonlinear network.- System of equations for magnetically coupled loops for A.C. machine in nonlinear network.- Peculiarities of operation modes of alternating current machine with short-circuited rotor windings at nonsinusoidal power supply.- Operation problems of high-power A.C. machines in nonlinear network.- Frequency-controlled induction motors in nonlinear networks: assessment criteria of higher harmonics influence. Method of criteria calculation.- Method of minimizing losses in high-power low-speed frequency-controlled motors in operation modes at

Boguslawsky I. Z. is a professor in the Theoretical Electrical Engineering and Electromechanic Department at Peter the Great St. Petersburg Polytechnic University and is a senior member of IEEE. He has spent 50 years in the electric machine-building industry (calculation and design of large alternating current machines). His work at the "Elektrosila" Works Stock Company was in power machines and the Leningrad Electrical Machine Building Plant.

Korovkin N. V. is a professor in and head of the Theoretical Electrical Engineering and Electromechanic Department at Peter the Great St. Petersburg Polytechnic University. He has more than 35 years' experience in power engineering.

Hayakawa M. is an emeritus professor of the University of Electro-Communications (UEC), a fellow of The Institute of Electronics, Information and Communication Engineers (IEICE), Japan, and a senior member of The Institute of Electrical Engineers (IEE), Japan. He is the CEO of the Hayakawa Institute ofthe Seismo Electromagnetics Co. Ltd. (UEC Incubation Center) and a visiting professor at the Advanced Wireless & Communications Research Center (AWCC), UEC, Tokyo. He has more than 45 years' experience in electromagnetics.



The authors gratefully welcome any comments and suggestions (in English, German, or Russian languages) on the contents of this monograph. They should be addressed to Polytechnicheskaya str., 29, Peter the Great St. Petersburg Polytechnic University, Theoretical Engineering and Electromechanic Department, St. Petersburg, 195251, Russia; email: Nikolay.korovkin@gmail.com.