Speed transients of D-C rolling mill motors

In its introductory part, this paper explains why the transient speed changes of d-c motors under suddenly applied loads may affect the quality of the product rolled on a continuous rolling mill. In a later section, the paper analyzes the behavior of such motors driving a tandem tube mill, and points out the difference between the transient and the steady-state speed-load characteristics; the former greatly affects the product, while the latter, or the conventional speed regulation, is of only minor importance. The paper outlines the course to follow in choosing the most suitable motors and gives a mathematical study of the transient speed-load changes.