A 3 phase motor, 440 voltage, induction motor. If we take
out rotor from motor and if we give supply 440 volt to
stator then what happens?????
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Answer Posted / srinivas kudligi
when the rotor is present then the stator and the rotor combination can be imagined as a transformer. thus the load inductance of the rotor is transfered to the stator increasing the total inductance of the stator. when in low load / no load condition then the slip is very low and hence low power drawn, but as the load is increased and the slip increases the currents increase and produce more torque to reduce the slip and hence finally reduce the power drawn. whereas the design of the motor is carried out in such a way that the stator reactance is maintained low to match the power delivery after accounting for the reflected rotor reactance. thus if the rotor is removed then the reactance is too small and hence will draw a very high current and burn out the stator.
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