amount of power that the motor produces.
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40 kW is the amount of power that is fed into a 500-volt, 50-hertz, three-phase, six-pole, squirrel-cage induction motor that rotates at 975 revolutions per minute. The friction and windage losses add up to 2kW, which brings the total stator losses to 1kW.
Determine the amount of power that the motor produces.
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- A squirrel-cage induction motor is operating at 1175 RPM and producing a torque of 22 Ib-ft. What is the horsepower output of the motor?The full load slip of a 4-pole, 60Hz, 440V (line-to-line) three phase induction motor is 0.05. (i). What is the speed of the rotating stating? What is the frequency (in Hz) of the rotor current? (ii). When the output power of the motor is 90 hp at a speed of 1732 rmp, rotational losses (which include frictional and core losses) are 10,100W, while copper losses for both the rotor and stator total 3700W. Determine the motor efficiency and line current, assuming the motor has a 0.8pf lagging under the conditions.The power input to a 500V, 50Hz, 6 pole, 3 phase squirrel cage induction motor running at975 RPM is 40kW. The stator losses are 1kW and friction and windage losses are 2kW.Find the output power of the motor.
- A 415V, three-phase, 50 Hz, 4-pole, star-connected induction motor runs at 24 rev/s on full load. The rotor resistance and reactance per phase are 0.35 ohm and 3.5 ohm respectively, and the effective rotor-stator turns ratio is 0.85:1. Calculate (a) the synchronous speed, (b) the slip, (c) the full load torque, (d) the power output if mechanical losses amount to 770W, (e) the maximum torque, (f) the speed at which maximum torque occurs, and (g) the starting torque.In a 4-pole, 50 Hz single-phase Induction motor, the power absorbed by the forward and backward field rotor equivalent resistances are 200 W and 21W respectively at a motor speed of 1440 rpm. The mechanical losses totals 20W. Compute the shaft torque at the above speed.An 8 pole,40-hp,2300 v,50-Hz, 3 phase, induction motor is operating at 80% of rated load and 6% reduced voltage. The efficiency and power factors for these conditions are 85 and 90 percent respectively. The mechanical power losses, rotor conductor losses, and stator losses are 1011 W, 969 W, and 1559 W respectively.Sketch the power flow diagram and determine:i. Mechanical power developedii. Shaft speediii. Developed torqueiv. Shaft torquev. Slip speedvi. Line current
- A 40 hp, 230-V, 8 pole , 25-Hz three phase induction motor is running at 355 rpm at rated load. The torque lost by friction is 24 N-m. If total stator losses amount to 1000 W, evaluate the efficiency of the motor at this load.A three-phase, 50-Hz, 6-pole induction motor develops a useful torque of 120 Nm at full-load, while the rotorfrequency is 2 Hz. The torque lost due to friction and windage is 10 Nm. Calculate:1. the slip2. the synchronous speed3. the motor speedA 4-pole, 3-phase, 50Hz induction motor has a voltage between slip-rings on open circuit of 520V. The star connected rotor has a standstill reactance and resistance of 2.0 and 0.4 Ω per phase respectively. Determine: (a) The full-load torque if full load speed is 1,425 rpm(b) The ratio of starting torque to full-load torque(c) The additional rotor resistance required to give maximum torque at standstill.
- The full-load slip of 4-pole,60Hz,440v (line -to-line) three phase induction motor is 0.05. i.What is the speed of the rotating stator field?What is the frequencey (in Hz) of the rotor current. ii.When the output power of the motor is 90 hp at a speed of 1732rpm,rotational losses(which includes frictional and core losses) are 10,100W,while copper losses for both rotor and stator total 3700W.Determine the motor efficiency and line current,assuming the motor has a 0.8 pf lagging under these conditions.A 6-pole, 60-Hz, Y-connected, three-phase induction motor develops a torque (Td) of 250 N.m at a speed of 720 rpm. The rotor resistance is 0.4 Ohm/phase, and the stator winding impedance is negligible. A) What is the air-gap power? B) What is the rotor current refered to the stator? C) If the rotational loss is 1kW, what is the motor output power in hp?The efficiency of a 17 kW, 4-pole, 50 Hz, three-phase asynchronous motor is given as 85%. For this load value, stator copper losses are given as 900 W and friction ventilation (mechanical) losses are given as 1100 W. Calculate the slip, the torque induced in the rotor, and the net shaft torque.