A 75-kW, 50-Hz, four-pole, and 460-V three-phase, wound-rotor induction motor develops full load torque at 1438 r/min
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A 75-kW, 50-Hz, four-pole, and 460-V three-phase, wound-rotor induction motor develops full load torque at 1438 r/min with the rotor short-circuited. An external non-inductive resistance of 1.1Ω is placed in series with each phase of the rotor, and the motor is observed to develop its rated torque at a speed of 1405 r/min. Calculate the rotor resistance per phase of the motor itself.
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