Standard Polyphase Apparatus and Systems

60 cycles 80 per cent 90 degrees alternating current alternating-current amperes apparatus armature reaction armature windings arrangement brushes capacity cent power factor cloth coils collector rings commutator conductors connected constant construction continuous current continuous-current copper core counter E.M.F. curve delivered designed device diagram direct direct current direct-current effect efficiency Electric energy equal exciting current feeder flux frequency full load give Illustrated impressed E.M.F. increase induction motor insulation kilowatts lagging current lamps lighting loss machine magnetic circuit maximum number of poles Oil Switch operation output phase displacement polyphase polyphase system potential practically primary ratio reactance reduced regulation repulsion motor resistance revolutions per minute rheostat rotary converter rotation rotor secondary self-induction shaft short-circuited shown in Fig shunt single-phase six-phase slots speed starting torque station stationary supply synchronous motor terminals three-phase tion torque trans transformers two-phase usually voltage drop volts wattless wattmeter wires wound