Melnykov V. Improvement of energy data of the vector controlled electric drive with non-symmetry windings of induction motor

Object of research – energy conversion processes in induction motor; Aim of the work consists in increase of energy parameters of vector-controlled induction motors due to increase of adjustment accuracy of control system by electromagnetic parameters via compensation of induction motor stator windings asymmetry; research methods are based upon: fundamental notions of theoretical electrotechnics, electric machines theory, automation control theory, electric circuits theory, harmonic analysis method, methods for solving algebraic and differential equations, mathematic modeling and experimental research; theoretical results: a vector-controlled system for electric drive was improved via regulation of rotor flux and stator currents by each phase separately, which, in difference to existing control systems, allows regulator adjustment according to asymmetry of electromagnetic parameters in equivalent circuit and decreases fluctuations of electromagnetic torque and heating electric energy losses due to generation of asymmetrical control signals for rotor phase fluxes according to winding asymmetry; a method for identification of vector-controlled induction motor electromagnetic parameters in pre-starting mode via testing influences on stator windings as a low-frequency sinusoidal voltages and determination of interphase equivalent circuit parameters was improved, which, in difference to existing method, allows to define mutual inductance, active and inductive resistances of each motor phase separately, which helps to take into account IM electromagnetic asymmetry for parametrical synthesis of proposed control system. Practical results – a methodology for measuring the instantaneous values of a vector-controlled IM currents and voltages signals was developed; an additional program module for implementation of proposed control system was developed; a methodology for determination induction motor electromagnetic parameters in pre-starting mode taking into account its asymmetry was developed. Implementation – at the enterprises of Ltd. “Semiol”, JSC SRI “Peretvoruvach”, for training students of Zaporizhzhya National Technical University and Kremenchuk Mykhailo Ostrohradskyi National University. Sphere (branch) of implementation – a control system for alternate current electric drives.