The Pipe Rotation Electric Drive of a Cold Rolling Mill at JSC Chelyabinsk Pipe Plant

Abstract

This article proposes a technique for selecting power electric equipment and an algorithm for synthesizing the control system of critical works of metallurgical production by the example of the pipe rotation electric drive of the cold rolling mill at JSC Chelyabinsk Pipe Plant. The optimal parameters of the power parts of the electric drive were chosen against the maximum response speed criterion, which allowed improving the overall output of ultrafine-wall pipe production. It is shown that the amplitude of self-oscillations conditioned by the finite stiffness of the transmission between the engine and the actuating device can be restricted by selecting an appropriate gear ratio for the reducer. Simplification of the system’s mechanical transmission made it possible to reduce mechanical losses and more easily to adjust the electric drive with a load described in the two-mass system, but required uprating the installed capacity by around 100%. The parameters of corrective devices of electromagnetic torque, speed, and position adjustment loops were determined by the classical techniques of frequency analysis and synthesis. As shown by analyzing transient process curves, the response speed of the rotation electric drive was increased by around 80% and the overall output rate of the mill by 15 to 20%. The expected annual economic effect of the adopted engineering solutions amounts to around 250 million rubles.