Statsenko O. Electromechanical systems with increased "torque-current" ratio with frequency-current control

The object of research: induction motor speed and torque regulation processes in the electromechanical systems. The purpose of research: "torque-current" ratio increase in the electromechanical systems with induction motors by torque and speed frequency-current control methods perfection, with consideration of frequency converters’ specificity. Methods of research: the elements of electric machines theory, electric drives theory, electric circuit theory, automatic control theory, methods of mathematical and physical modeling are used. Theoretical and practical results and innovations: induction motor models structures are validated, which should be used for torque and speed regulation processes analysis in “frequency converter - motor” system with fourwire connection; the new magnetizing current and stator voltage amplitude limitation method is suggested, which consists in regulation of the absolute slip with the use of voltage feedback; the new dependencies are acquired, which should be used for stator current and absolute slip variation to enhance "torque-current" ratio in the frequency range from zero to nominal speed with motor magnetic system saturation taken into account; it is proved, that the speed regulation system, while using suggested torque control subsystem, with a typical proportional-plus-integral action controller have a local asymptotic stability. A subject and degree of introduction: are used in educational process KNUTD and are transferred for use in developments S&IC “Sinapse". Effectiveness of implantation: electromechanical systems energetic characteristics perfection. Sphere of use: hauling electromechanical systems of transport means.