A three-phase, four-pole, 50-hp, 480-V, 60-Hz, Y-connected induction motor has t

Question

A three-phase, four-pole, 50-hp, 480-V, 60-Hz, Y-connected induction motor has the following parameters per phase:

r1 = 0.10 ? , x1 = 0.35 ? , r2' = 0.12 ?, x2' = 0.40 ? .

It is known that the stator core losses amount to 1200 W and the rotational losses equal 950 W. Moreover, at no-load the motor draws a line current of 18 A at a power factor of 0.089 lagging.

When the motor operates at a slip of 3.5%, find :

a. The input line current and power factor

b. The developed electromagnetic torque in newton-meters

c. The horsepower output

d. The efficiency

e. Repeat the resuts a-d for the slip of 5%

Explanation / Answer

The following link may help :

http://venus.ece.ndsu.nodak.edu/~glower/ECE331/L_Sp10/4_AC_Induction_Machines.pdf

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