Transients in a Kramer Cascade

This paper discusses some transients in a modified Kramer-cascade, i.e., a cascade with the mechanical converter replaced by a diode rectifier bridge. First, a new method of starting the drive is described. It uses a single resistor in the armature circuit of the dc motor with the additional advantages of high starting torques at relatively low starting currents. Also, a rapid method for braking the drive is proposed with the braking effect being achieved by having both machines work as generators. Finally, since the drive may be used as part of a closed-loop system, its transfer function is calculated.