METHOD AND APPARATUS FOR SPEED COMPENSATION DUE TO ABRUPT CHANGES IN LOAD IN A METAL ROLLING MILL

摘要

METHOD AND APPARATUS FOR SPEED COMPENSATION DUE TO ABRUPT CHANGES IN LOAD IN A METAL ROLLING MILL A speed control system for a motor drive employed to drive a work roll of a metal rolling mill in which a metal work piece is passed between a pair o work rolls to deform the work piece includes first and second feedback paths providing signals respectively proportional to roll speed and motor current which are combined to form a basic speed control of the motor. Speed changes due to abrupt changes in loading of the rolls occasioned by inconsistencies in the work piece entering between the rolls are compensated for through the generation of a compensating signal which is combined with the basic speed signal to develop a final control signal for the motor. The compensating signal is generated as a function of the force acting to separate the work rolls due to the presence of the work piece between the rolls.