Method for dynamic load limitation at mechatronic systems of the plate mill stand

The paper forms the rationale for relevance of developing control systems ensuring limitation of dynamic torques in electric drives of the reversing plate mill stand at shock loading. Control algorithms are presented, which provide for preliminary selection of gaps in spindle joints and compensation of the dynamic error of speed maintenance at metal pickup. The electric drive control method, which comprises advantages of all these solutions, is developed. The functional diagram of the control system, which illustrates the method, is presented. The math model of the electromechanical cylinder system is developed, which considers elastic coupling in transmissions. The results of modeling the transient processes of the electric drive speed and torque at pickup when implementing the current and new control methods, are presented. The enhanced control algorithm is proposed; according to it, speed decrease after the pickup goes with the preset negative acceleration. Results of modeling which proved technical efficiency of the algorithm, are given. According to the modeling results, the optimal pace of electric drive slowdown was rationalized. Oscillograph charts of speeds and torques of the electric drives of the plate mill 5000 stand, obtained when implementing the developed method, are presented. After long-term studies, the improvement of dynamic parameters against the existing electric drive system was confirmed. The conclusion was made on the reasonability of implementing of the introduced solutions.