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// FUNDAMENTALS OF ELECTICAL MACHINES
// M.A.SALAM
// NAROSA PUBLISHING HOUSE
// SECOND EDITION
// Chapter 7 : THREE-PHASE INDUCTION MOTOR
// Example : 7.5
clc;clear; // clears the console and command history
// Given data
V = 440 // supply voltage in V
P = 4 // number of poles
P_ag = 1500 // rotor i/p in kW
P_rcu = 250 // copper loss in W
f = 50 // frequency in Hz
// caclulations
s = P_rcu/P_ag // slip
N_s = 120*f/P // synchronous speed in rpm
N_l = (1-s)*N_s // rotor maximum speed in rpm
P_mech = (1-s)*P_ag // mechanical power developed in W
// display the result
disp("Example 7.5 solution");
printf(" \n Slip \n s = %.3f \n", s);
printf(" \n Synchronous speed \n N_s = %.f rpm \n", N_s);
printf(" \n Rotor speed \n N_l = %.0f rpm \n", N_l);
printf(" \n Mecahnical power developed \n P_mech = %.0f W \n", P_mech);
// NOTE : small change in answer instead 1245 got 1250W
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