1. A 20 Hp, 220 volts, three-phase, 60 cycles SCIM has a speed of 830 rpm and a current of 64 amps per line. If the motor takes 20.8 kW when operating at full-load, calculate the following: a. slip, b. percent regulation if the no-load is 895 rpm, c. power factor, d. torque, and e. efficiency. 2. A 6-pole, 3-phase, 60 Hz, induction motor takes 48 kW in power at 1140 rpm. The stator copper loss is 1.4 kW, stator core loss is 1.6 kW, and rotor mechanical losses are 1 kW. Calculate the mechanical efficiency, electrical efficiency, and overall efficiency. 3. A wye connected, 400 V, 3-phase, 60 Hz, 4-pole induction motor has a full-load speed of 1710 rpm. The rotor has an impedance of (0.5+ j4) ohm and rotor/stator turn ratio of 0.7. Calculate a. full-load torque, b. full-load rotor copper loss and rotor current, c. power output if windage and friction losses amount to 500 W, d. starting current and e. starting torque.
1. A 20 Hp, 220 volts, three-phase, 60 cycles SCIM has a speed of 830 rpm and a current of 64 amps per line. If the motor takes 20.8 kW when operating at full-load, calculate the following: a. slip, b. percent regulation if the no-load is 895 rpm, c. power factor, d. torque, and e. efficiency.
2. A 6-pole, 3-phase, 60 Hz, induction motor takes 48 kW in power at 1140 rpm. The stator copper loss is 1.4 kW, stator core loss is 1.6 kW, and rotor
3. A wye connected, 400 V, 3-phase, 60 Hz, 4-pole induction motor has a full-load speed of 1710 rpm. The rotor has an impedance of (0.5+ j4) ohm and rotor/stator turn ratio of 0.7. Calculate a. full-load torque, b. full-load rotor copper loss and rotor current, c. power output if windage and friction losses amount to 500 W, d. starting current and e. starting torque.
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