Nguyen V. Dynamic regimes of Electromechanical systems of hoisting mechanisms of cranes with the electric drive "The voltage converter – induction motor".

The purpose of research is development of methods of analytical synthesis of the electric drive "Voltage converter – induction motor" (VC–IM) of electromechanical system (EMS) of hoisting mechanisms in view of nonlinear properties and electromagnetic transients of induction motor and development of the recommendations on improvement of quality EMS. Theoretical and practical results are: effective models for improvement of methods of account of the closed electric drives of VC–IM are proposed. The guaranteed range of speed regulation of hoist mechanisms is 20:1-15:1, and also opportunity of increase of term operation of EMS of hoist mechanisms and expansion of borders of application of the electric drive VC–IM is supplied. The mathematical model the further development on the basis of transfer functions with replaceable factors, which take into account IM nonlinear properties has received; the expressions for analytical account of critical factor on conditions of stability of the electric drive the VC–IM with a speed feedback are offered; the method of construction of stability areas of EMS of the hoist mechanism is offered in view of features of the IM and elastic elements deformation. The materials of the dissertation are considered at session of technical advice ltd."Converter" (Zaporozhye) and the enterprises " CDDK VIET XO " (republic of Vietnam) also have received a positive estimation. The dissertation in educational process of faculty "Electromechanical systems with numerical control" of the Odessa national polytechnic university is used. Sphere of application: electromechanics.