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DIRECTCURRENT CONTACTORS AND RELAYS I
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 anode applied armature and ﬁeld 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 winding ﬁrst ﬂux full-load hoist control horsepower ignitron inductance interlock limit switch line contactor load current 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 rotation saturable reactor series motor series resistance short-circuited shown in Fig shunt ﬁeld signal solenoid speciﬁc speed-torque curves starter starting resistor starting torque tactor thyratron trol volts zero