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A 4-pole, 3-phase induction motor runs at 1440 rpm on a 50Hz supply. Find the slip speed.
- a)2940 rpm
- b)1500 rpm
- c)1440 rpm
- d)60 rpm
Correct answer is option 'D'. Can you explain this answer?
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A 4-pole, 3-phase induction motor runs at 1440 rpm on a 50Hz supply. ...
Slip speed 
Slip speed
Slip speed
Most Upvoted Answer
A 4-pole, 3-phase induction motor runs at 1440 rpm on a 50Hz supply. ...
Solution:
Given data:
Number of poles (P) = 4
Frequency (f) = 50 Hz
Synchronous speed (Ns) = (120f)/P = (120×50)/4 = 1500 rpm
Actual speed (N) = 1440 rpm
We know that,
N = Ns(1-s)
Where,
s = slip
So,
s = (Ns - N)/Ns = (1500 - 1440)/1500 = 0.04 or 4%
Therefore, the slip speed = s × Ns = 0.04 × 1500 = 60 rpm
Hence, the correct option is (D) 60 rpm.
Given data:
Number of poles (P) = 4
Frequency (f) = 50 Hz
Synchronous speed (Ns) = (120f)/P = (120×50)/4 = 1500 rpm
Actual speed (N) = 1440 rpm
We know that,
N = Ns(1-s)
Where,
s = slip
So,
s = (Ns - N)/Ns = (1500 - 1440)/1500 = 0.04 or 4%
Therefore, the slip speed = s × Ns = 0.04 × 1500 = 60 rpm
Hence, the correct option is (D) 60 rpm.
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A 4-pole, 3-phase induction motor runs at 1440 rpm on a 50Hz supply. Find the slip speed.a)2940 rpmb)1500 rpmc)1440 rpmd)60 rpmCorrect answer is option 'D'. Can you explain this answer?
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