The rotor power output of a 3-phase induction motor is 30 KW and corresponding slip is 4%. The rotor copper loss will be

Question

The rotor power output of a 3-phase induction motor is 30 KW and corresponding slip is 4%. The rotor copper loss will be

RRB Paper · Accepted Answer

Using the formula for rotor input power as output power divided by (1 - s), we get:

Rotor input power = 30000 / (1 - 0.04) = 31250 W

And using the formula for rotor copper losses as rotor input power minus rotor output power, we get:

Rotor copper losses = 31250 - 30000 = 1250 W

Therefore, the rotor copper losses are approximately 1250 W.

625 Watt