Page 716 - Basic Electrical Engineering

Substituting values

Example 8.9 A 15 hp, three-phase, four-pole, 50 Hz induction motor has
full-load speed of 1455 rpm. The friction and windage loss of the motor at

this speed is 600 W. Calculate the rotor copper loss.

Solution:

Slip

Motor output available at the shaft = 15 hp
= 15 × 735.5 W
= 11032 W

Now, let us look at the power flow diagram