Question 9.4: The frequency of the rotor-induced EMF of 400 V, three-phase...
The frequency of the rotor-induced EMF of 400 V, three-phase, 50 Hz, six-pole induction motor is 2 Hz. Calculate the speed of the motor.
N_{s}=\frac{120 f}{P}=\frac{120 \times 50}{6}=1000 rpm
Rotor frequency, f_{r}=Sf
or, 2 = S × 50
or, S = 0.04
Again, S=\frac{N_{s}-N_{r}}{N_{s}}
Substituting values 0.04=\frac{1000-N_{r}}{1000}
or, N_{r}=960 rpm
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