APPARATUS FOR AUTOMATIC COMPENSATION OF DYNAMIC CURRENT OF ELECTRIC DRIVE OF LOOPER Russian patent published in 1999 - IPC

FIELD: automatization of rolling process, possibly systems for automatic control of interstand tension. SUBSTANCE: apparatus includes set of members for controlling tension depending upon lifting angle of looper due to changing revolution number of drive unit of rolling stand. Apparatus also includes unit for calculating derivative and adder. Information input of unit for calculating derivative is connected with output of pickup measuring lifting angle of looper. Control input of unit for calculating derivative is connected with output of control unit. One input of adder unit is connected with output of unit for calculating torque, other input of adder is connected with output of unit for calculating derivative. Output of adder is connected with control input by limiting level of limiter. EFFECT: less loss of yield due to minimisation of strip width difference, reduced probability of emergency conditions at guiding strip between stands. 3 dwg