A 4 pole 50hz induction motor is running at 1470 rpm. What is the slip value
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Answer:
slip value = 2%
Explanation:
Slip is defined as the difference between the flux ( synchronous )speed & the rotor speed
Slip value is defined in % = ( (Synchronous speed - rotor speed)/ Synchronous speed) * 100
f = PN/120
f is frequency = 50 Hz
,P is number of poles = 4
N = Synchronous speed in rpm
50 = 4 * N/120
=> N = 1500
Synchronous speed = 1500 rpm
rotor speed = 1470 rpm
Slip value = ((1500 - 1470)/1500 ) * 100
= (30/1500) * 100
= 2 %
slip value = 2%
Speed of the rotor of an induction motor is always less than its synchronous speed.
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