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TYPES OF AC MOTORS AND THEIR
THREEPHASE INDUCTION MOTORS
THREEPHASE INDUCTION COMMUTA
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amperes armature arranged auto-transformer auxiliary switch bi-metal strip brush button capacitor motor cent change-over closed Contactor Starter contacts control gear dashpot DC motor delta connection diagram direct current direct switching electrical electromagnetic excitation Factor and Efficiency fitted fractional h.p. full-load current full-load torque h.p. motors hand-operated starters illustrated in Fig machine magnetic main winding master frequency mechanical motor-generator multi-finger normal number of poles obtained operating coil over-current releases overload phase plunger pole face position power factor push-button reactance repulsion motor reversing rotary magnetic field rotation rotor circuit rotor contactors rotor winding running short-circuiting shown in Fig shunt single-phase Slip-ring Motor slots small motors solenoid speed characteristic squirrel-cage motor star-delta starting starting current starting period starting resistance starting rheostat starting switch starting torque starting winding stator contactor stator control switch stator winding suitable supply system synchronous motor thermal relay three-phase induction motor three-phase motor tripping bar under-voltage release voltage