Calculate the mechanical speed of rotar:
An asynchronous machine of 460V, 25hp, 4 poles with rotor wound in Y has the following data (of the side stator):
Resistance of the rolling-ups of the stator: R1=0.55 ?
Reactance of the rolling-ups of the stator X1=1.1 ?
Resistance of the rolling-ups of the rotor R2=0.3 ?
Reactance of the rolling-ups of the rotor X2=0.46?
Reactance of magnetizing xΦ = 30Ω
Frequency of operation 60Hz
1-What is the mechanical speed (in tours per minute) of the rotor for the maximal led couple?
2-What is the couple led by starting up?
3-Recalculate the mechanical speed (in tours per minute) of the rotor for the maximal led couple having doubled the resistance of the rotor.
4-Recalculate the couple led by starting up having doubled the resistance of the rotor.