26-02-2013, 03:26 PM
3 PHASE INDUCTION MOTOR
3 PHASE INDUCTION.pptx (Size: 4.56 MB / Downloads: 210)
CONSTRCTION
2 PART:-
STATOR:-STATIONARY PART
BUILD UP BY:-high grade silicon steel
ROTOR:- ROTATING PART
ROTOR HAS 2 TYPE:-
1:-CAGE ROTOR
2:-WOUND ROTOR
CAGE ROTOR
SKEWED SHAFT
SHORT CIRCUITED AT BOTH END
ADVANTAGE OF SKEWING:-
1:- MORE UNIFORM TORQUE
2:- LESS NOISE
3:-REDUSE LOCKING TENDENCY
WOUND ROTOR
CONSIST SLOTTED ARMATURE
ROTOR WINDING CONNECTED IN STAR
3 SLIP RING
3 EXTRA RESISTANCE CONNECTED STAR
PARPOSE OF RESISTANCE
1:-TO INCREASE STARTING TORQUE AND DECREASE STARTING
CURRENT
2:-TO CONTOL ROTOR SPEED