Pilgering Mill Electric Drive

The article presents an assessment of the characteristics of the electric drive of the cold-pilgering mill, in which each phase of the stator motor windings is connected to an independent DC source. The evaluation was performed according to the criterion of maximum speed. A set of mathematical equations with lumped parameters of an electrical machine was adopted as a model, and a semiconductor converter was represented by an aperiodic link of the second order. A synchronous motor based on an asynchronous motor with a phase rotor was used as an electric machine. In an electric car, the stator windings of the motor were connected to a DC source. The rotor windings were connected to a frequency converter. It is shown that the speed of the control circuit of the electromagnetic torque in such a scheme does not exceed 130 rad/s. This speed is limited to the analog-to-digital converter through which the control signal from the output of the speed regulator is fed. To increase the system response speed, it is proposed to generate a control signal via a serial digital channel, for example, Ethernet. The rejection of the analog form of the control signal will significantly increase the accuracy of the electric drive system, while the expected cut-off frequency in the control circuit of the torque can reach 700-800 rad/s.