1. A 10-hp, 4-pole, 25-Hz, 3-Ф induction motor is taking 9,100 watts from the line. The core loss is 290 watts; stator copper loss is 568 watts; rotor copper loss is 445 watts, and the friction and windage loss is 121 watts. Determine the output torque in Newton-meter.
1. A 10-hp, 4-pole, 25-Hz, 3-Ф induction motor is taking 9,100 watts from the line. The core loss is 290 watts; stator copper loss is 568 watts; rotor copper loss is 445 watts, and the friction and windage loss is 121 watts. Determine the output torque in Newton-meter.
2. For a three-phase induction motor having rotor circuit resistance of 6 ohms, maximum torque occurs at a slip of 0.6. Find the value of standstill rotor circuit reactance.
3. A 4 - pole, 3 - phase, 60 Hz squirrel-cage motor draws 21 A and 7 kW while driving its normal load. Under these conditions, its slip is 2%. When running idle, this motor draws 6 A and 580 W at normal voltage. With its rotor blocked, this motor draws 15 A and 500 W with 50 V applied. What is the output torque of this motor when driving its normal load.
4. A 4-pole, 50 Hz, 3- phase induction motor develops a maximum torque of 110 N-m at 1360 rpm. The resistance of the star-connected rotor is 0.25 Ω /phase. Calicul the value of resistance that must be inserted in series with each rotor phase to produce a starting torque equal to half maximum torque.
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