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 nonlineardependence of shaft torque on rotation speed.- Methods of decreasing nonlinear distortion factor in voltage curve of salient-pole generator. Investigation of EMF tooth harmonics of its multiphase winding with q per pole and phase as integer.- Methods of decreasing nonlinear distortion factor in voltage curve of double-fed machines. Investigation of EMF tooth harmonics of its multiphase stator and rotor windings with q per pole and phase as integer.- Method of determination stator winding MMF at arbitrary phase current waveform and unequal width of phase zones (for investigation of operational characteristics of frequency - controlled motors).- Investigation method of transient modes in induction machines with rotor cage asymmetry.- Theory and methods of investigation of eddy currents and additional losses in stator windings.

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• Tecnologia e engenharia da energia
• Cibernética e teoria dos sistemas
• Engenharia electrotécnica
• Engenharia do controlo automático

Electric Power Systems;Double Fed Machines;Networks with Nonlinear Elements;Harmonics of MMF of Stator Winding;Minimization Methods of Losses;Synchronous and Asynchronous Machines