Evaluation of limit regulation values for positional electric drive in a system equipped with cycloconverters

The paper considers evaluation of limits in a system with cycloconverters. The electric drive of the cold reducing tube mill is used as an example. The paper analyzes main factors influence on speed of the torque control loop. The influence of dead time and firing angle of the thyristors on the nonsinusoidality ratio and limitation of the analog-to-digital converter's passband was assessed. This analysis allowed revealing the “trouble spots” in the hardware and power components of the existing system.