In a 3-phase induction motor, rotor copper loss is equal to:
ARotor mechanical power developed
BSlip * Rotor input power
CRotor input power / Slip
D(1 - Slip) * Rotor input power
Explanation
In a 3-phase induction motor, total power transferred across the air gap is rotor input Pg. Electrical loss dissipated in rotor windings is directly given by Rotor Copper Loss = s * Pg, where s is rotor slip.
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