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the time period of rotor current of a 3 phi 4 pole
Question:
The time period of rotor current of a 3-\(\phi\), 4-pole, 50 Hz, induction motor is 200 ms. Then slip speed of the motor is
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Slip frequency helps calculate the difference between synchronous and rotor speeds.
TS PGECET - 2024
TS PGECET
Updated On:
Jun 13, 2025
1425 rpm
1350 rpm
75 rpm
150 rpm
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The Correct Option is
D
Solution and Explanation
Rotor current time period = \( \frac{1}{f_{slip}} = 0.2 \text{ s} \Rightarrow f_{slip} = 5 \text{ Hz} \) Synchronous speed \( N_s = \frac{120f}{P} = \frac{120 \times 50}{4} = 1500 \text{ rpm} \) Slip speed \( = \frac{f_{slip}}{f} \times N_s = \frac{5}{50} \times 1500 = 150 \text{ rpm} \)
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