388 / | HD | ELECTRICITY: MOTOR CONTROL SYSTEMS |
848 | DF | OPEN LOOP ACCELERATION CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR {2} |
853 | .~ Armature control {2} | |
854 | DF | .~.~> By voltage or current modification |
855 | DF | .~.~> By selectable or variable impedance {2} |