A. dependent on the shaft loading
B. dependent on the number of slots
C. slip times the standstill e.m.f. induced in the rotor
D. none of the above
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A. dependent on the shaft loading
B. dependent on the number of slots
C. slip times the standstill e.m.f. induced in the rotor
D. none of the above
This Answer Is .B
The EMF induced in a rotor bar is of sinusoidal form following the magnetic flux form and is equal to 180/p/Zrotor, where Z is the number of rotor slots.
At starting of the motor, the frequency of induced EMF is high due to the large slip, which is equal to the frequency of the rotor EMF divided by the supply frequency.
The equation for the EMF of an induction motor is similar to that of a transformer; it is equal to 4.44f*Flux * Nph, where f is the supply frequency, Flux is the magnetic flux, and Nph is the number of poles in the motor.