DC Drives

DC drives regulate the armature and field voltages of a direct current motor to give precise speed and torque control across a wide range. Although largely replaced by AC frequency drives in new installations, they remain in widespread service on existing extrusion, winding, paper and textile lines — on these machines, replacing the drive is often more economical than replacing the motor. The category includes thyristor bridge analogue drives and digitally controlled models. Selection is based on the motor's armature voltage and current together with its field supply ratings.