A 3-phase, 208 V, 60 Hz, 30 hp, four-pole induction motor
A 3-phase, 208 V, 60 Hz, 30 hp, four-pole induction motor has the following equivalent circuit parameters.
R1 = 0.2 Ω, , , Xm = 12Ω.
The rotational loss is 500 W. For a slip of 5%, calculate
(a) The motor speed in rpm and radians per sec
(b) The current drawn by the motor from the power supply
(c) The stator cu-loss
(d) The air gap power
(e) The rotor cu-loss
(f) The shaft power
(g)The developed torque and the shaft torque (h) The efficiency of the motor
Use the IEEE-recommended equivalent circuit.
Homework Answers
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A 4 phase, 460 V, 60 Hz, 26.8 hp, 4 pole, Y-connected
induction motor draws 25 A at a power factor of 0.9 lagging. Core
loss is 900 W, stator copper loss is 1100W, friction and winding
losses are 300 W, and stray loss is neglected. The machine shaft
rotates at 1738 rpm. Calculate the air gap power and output load
torque
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1. A 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the following parameters in Ω/phase referred to the stator: R,-0.220, Xi = 0.430, X,-15.0, R2 0.130 and X2-0.430. Mechanical and core losses amount to 300 W and 200 W respectively for rated voltage. (a) The motor is fed with a 60 Hz, 208 V voltage. It runs with a slip of 4.5 %. Find the speed, shaft torque and power, efficiency and power...
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