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DIRECTCURRENT CONTACTORS AND RELAYS
DIRECTCURRENT SOLENOIDS AND BRAKES
CONTROL OF SERIES MOTORS
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a-c voltage accelerating contactors adjustable-speed drive adjustable-voltage system adjustment AIEE ampere-turns amperes amplidyne applied armature circuit armature current armature shunting braking torque capacitor characteristics commutating contactor 1A contactor closing contacts control circuit control field control winding counter-emf current flows current-limit d-c motor d-c power d-c shunt motor devices Electrical energized feedback field circuit field current field excitation field resistance field winding flux full-load hoist control horsepower ignitron inductance interlock limit switch line contactor load current loop circuit magnetic amplifier master switch master-switch position mechanical motor armature motor control motor field motor speed motor torque no-load speed normally closed obtained One-line diagram output voltage power circuit rated reactor rectifier reduced regulator resistance in series retardation rheostat rotation saturable reactor series motor series resistance short-circuited shown in Fig shunt field signal silicon controlled rectifier solenoid speed-torque curves starter starting resistor starting torque tactor thyratron volts zero