An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will o

An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull
out torque will occur. The rotor resistance per phase is 0.3
ohm and motor stalls at 650 rpm. The rotor frequency at
maximum torque point is
A 3.33% B 4.44%
C 5.55% D 6.66%

Question Posted / parthjoshi

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An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resi..

Answer / jay laruja

-slip at 650 rpm

120fs/p
= (120 x 50) / 8
= 750

slip = (Ns + Nr) / Ns = 0.133

fr = s x fs = 0.13 x 50 = 6.667%

there you go buddy ;)

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