Based on the modernization experience of multi-motor electric drives, unique technological lines and hoisting units. Implementation methodology for such projects was suggested. Their essence is in the combination of experimental studies in the normal operation of equipment and the physical simulation to obtain adequate mathematical models, as well as in the development of new systems in the normal and emergency modes. This technology is allowed to upgrade electric drives of unit continuous annealing and casting crane with hoisting capacity 420 tons of the JS "ArcelorMittal Temirtau". As a result, metal heat treatment increased velocity from 2,5 to 8 m/s with a minimum dynamic loads in the strip. The imbalance of the moments was decreased to 1-2,5% from 45% in static and 20% in dynamic for casting crane, and the crane productivity has doubled.

Modern cold rolling mills include devices that form a reserve of strip to ensure the continuous operation of the line. Such devices include a horizontal looper containing a direct current drive. The disadvantage of the existing horizontal looper is significant oscillations of the metal strip in the process of its filling, with the maximum amplitude of oscillations occurring when the strip is completely filled. To study the oscillatory processes in the strip, a model of an electromechanical system has been developed. The necessity of taking into account mechanical properties of the steel strip in the development of a model of an electromechanical system has been substantiated. Mathematical and simulation models of a horizontal looper were developed in two extreme positions. The simulation models have been implemented in the MatLab software package. The results of simulation studies showed satisfactory convergence of the experiments with the physical process.