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CONTROL OF SQUIRRELCAGE MOTORS
CONTROL OF WOUNDROTOR MOTORS
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a-c motors accelerating contactors AIEE Paper ambient amperes applied autotransformer bimetal branch circuit button characteristic circuit breakers coil connected control circuit current flows current-limiting cycle deenergized devices disconnected drive drop dynamic braking Electrical energized field excitation flux frequency full-load current function fuses general-purpose heater high-voltage hoist controller horsepower induction motor input interlock interrupting limit switch line contactor machine magnetic master switch maximum torque motor circuit motor control motor current motor speed motor starters motor torque motor winding National Electrical Code negative-sequence obtained open-circuited output part-winding phase plugging power circuit power factor power system protection pushbutton reactance resistor rheostat rotation rotor saturable reactors secondary circuit secondary resistance selsyn short-circuit current shown in Fig single-phase slip rings speed-torque curves squirrel-cage motor squirrel-cage winding standstill starting current starting torque static switching stator stator winding synchronous motor synchronous speed temperature thermal overload relays three-phase transformer trip unit voltage volts wound-rotor motor