Shevchenko S. Asynchronous frequency-regulated electric drive with improved power indexes.

Tasks of creation of mathematical model adequate to the electromagnetic and electromechanical processes in the electric drive FC-IM are defined. The models of IM are developed in three-phase co-ordinates ABC in phase and linear values taking into account the effect of ousting of current and satiation of magnetic chain. The combined model of IM is offered, combining a three-phase source of power on the basis of linear tensions and simplicity of description of electromagnetic transitional processes of the two-phase model. Mathematical description of frequency converter is executed on the basis of the real structure of FC with AIT on the base of pulse-width modulation and modulation of base vectors. Principles of the vector field-oriented control of IM are explored, the influence of tuning of feed-backs on the character of dynamic processes of the electric drive is shown. The principle of providing the maximal moment of IM is analytically derived. Power descriptions of the electric drive FC-IM with the vector field-oriented control are revealed. The algorithm of optimization of losses in IM according to the maximum of OIR is offered. The criterion of optimization of losses in IM on condition of equality of projections of the stator current is offered. Variants of blocks of minimization of losses in IM according to the maximum of OIR and the offered criterion are considered. Recommendations for the use of the AIT with different types of modulation on the basis of harmonic analysis of the output tension of AIT and current of loading are given.