Q28/ For a 3-phase slip-ring induction motor, the maximum torque is 2.5times the full-load torque and the starting torque is 1.5 times the full-load torque. Determine the percentage reduction in the rotor circuit resistance to get full-load slip at 3%.Neglect stator impedance. Ans[ 56.8%]

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Q27/ A 6-pole, wound induction motor operates from a 3-phase, 50 Hz supply. The rotor parameters
3
Tutorial Sheet (2)
are R2-D0.12/phase and X2-D0.52/phase. Calculate the speed at which maximum torque occurs
and the value of external resistance necessary in the rotor circuit from this torque to occur the
starting.
Ans[800 r.p.m., 0.42/phase]
Q28/ For a 3-phase slip-ring induction motor, the maximum torque is 2.5times the full-load torque and
the starting torque is 1.5 times the full-load torque. Determine the percentage reduction in the rotor
circuit resistance to get full-load slip at 3%.Neglect stator impedance.
Ans[ 56.8%]
Q29/ A 3-phase induction motor has a synchronous speed of 250 r.p.m. and 4% slip at full-load. The
rotor has a resistance of 0.022 per phase and standstill leakage reactance of 0.152 per phase.
Calculate (i) the ratio of maximum and full-load torque (ii) the speed at which the maximum
Transcribed Image Text:Q27/ A 6-pole, wound induction motor operates from a 3-phase, 50 Hz supply. The rotor parameters 3 Tutorial Sheet (2) are R2-D0.12/phase and X2-D0.52/phase. Calculate the speed at which maximum torque occurs and the value of external resistance necessary in the rotor circuit from this torque to occur the starting. Ans[800 r.p.m., 0.42/phase] Q28/ For a 3-phase slip-ring induction motor, the maximum torque is 2.5times the full-load torque and the starting torque is 1.5 times the full-load torque. Determine the percentage reduction in the rotor circuit resistance to get full-load slip at 3%.Neglect stator impedance. Ans[ 56.8%] Q29/ A 3-phase induction motor has a synchronous speed of 250 r.p.m. and 4% slip at full-load. The rotor has a resistance of 0.022 per phase and standstill leakage reactance of 0.152 per phase. Calculate (i) the ratio of maximum and full-load torque (ii) the speed at which the maximum
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