Page 718 - Basic Electrical Engineering

= 7355 W
and slip, S = 0.04

Friction and windage loss = 0.03 × 7355 W

= 220.6 W

Power developed = 7355 − 220.6 = 7134.4 W

Rotor copper loss = S × Rotor input, (i)

Power developed = (1–S) Rotor input (ii)

From (i) and (ii),

or,

Substituting values,

Rotor input − Rotor copper loss = Power developed

Therefore, Rotor input = Power developed + Rotor copper loss

= 7134.4 + 297.3
= 7431.7 W

Let input power be = X W

Out of this, 0.06 X W is wasted as stator losses. Stator output = Rotor input =
0.94 X W. Equating with actual values, 0.94 X = 7431.7 W

or,