P3) A 440-V, 50-Hz, 4-pole, Y-connected, three-phase wound-rotor induction motor has the stator constant parameters of R, = 0.3 a and X, = 0.9 0 and constant rotor parameters of R, = 0.6 0 and X, = 0.82 %3! The rotational loss of the motor is 5% of the power developed. The machine operates at 3% slip in all conditions. a) Illustrate per-phase oquivalent circuit of this induction motor and its power-flow diagram.

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P3) A 440-V, 50-Hz, 4-pole, Y-connected, three-phane wound-rotor induction motor has the stator constant
parameters of R, = 0.3 0 and X, = 0,90 and constant rotor parameters of R, = 0.6 0 and X, = 0.8 2
The rotational loss of the motor is 5% of the power developed. The machine operates at 3% slip in all
conditions.
a) Illustrate per-phase oquivalent circuit of this induction motor and its power-flow dingram.
b) The motor is supposed to carry a conveyer where requires a minimum and maximum
mechanical torques of 30 and 50 N.m, respectively. The efficiency of the motor at its full-load
condition is calculated to be 90.78%. We are interested to increave the efficieney of the motor
without losing much on the mechanical torque. An electrical engincer proposed that if we
increase the rotor resistance or rotor reactance, the efficieney of the motor would be incremed.
As a student in electrical machine class, recommend which of the following approach would
be more suitable for this conveyer application und justify your answer?
1. By doubling the per-phase rotor winding leakage reactance.
H. By doubling the per-phase rotor winding resistance.
Transcribed Image Text:P3) A 440-V, 50-Hz, 4-pole, Y-connected, three-phane wound-rotor induction motor has the stator constant parameters of R, = 0.3 0 and X, = 0,90 and constant rotor parameters of R, = 0.6 0 and X, = 0.8 2 The rotational loss of the motor is 5% of the power developed. The machine operates at 3% slip in all conditions. a) Illustrate per-phase oquivalent circuit of this induction motor and its power-flow dingram. b) The motor is supposed to carry a conveyer where requires a minimum and maximum mechanical torques of 30 and 50 N.m, respectively. The efficiency of the motor at its full-load condition is calculated to be 90.78%. We are interested to increave the efficieney of the motor without losing much on the mechanical torque. An electrical engincer proposed that if we increase the rotor resistance or rotor reactance, the efficieney of the motor would be incremed. As a student in electrical machine class, recommend which of the following approach would be more suitable for this conveyer application und justify your answer? 1. By doubling the per-phase rotor winding leakage reactance. H. By doubling the per-phase rotor winding resistance.
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