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// FUNDAMENTALS OF ELECTICAL MACHINES
// M.A.SALAM
// NAROSA PUBLISHING HOUSE
// SECOND EDITION
// Chapter 7 : THREE-PHASE INDUCTION MOTOR
// Example : 7.7
clc;clear; // clears the console and command history
// Given data
V = 440 // supply voltage in V
P = 6 // number of poles
f = 50 // frequency in Hz
P_a = 45000 // i/p power
N_l = 900 // speed in rpm
P_tloss = 2000 // total power loss in W
// caclulations
N_s = 120*f/P // synchronous speed in rpm
s = (N_s-N_l)/N_s // slip
P_ag = (P_a-P_tloss) // air gap power in W
P_rcu = s*P_ag // rotor copper loss in W
P_mech = P_ag-P_rcu // mechanical power in W
P_0 = P_mech-3000 // o/p power in W
n = (P_0/P_ag)*100 // efficiency since n = P_o/P_in
// display the result
disp("Example 7.7 solution");
printf(" \n Slip \n s = %.1f \n", s );
printf(" \n Rotor copper loss \n P_rcu = %.f W \n", P_rcu );
printf(" \n Out put power \n P_0 = %.f W \n", P_0 );
printf(" \n Efficiency \n n = %.f percent \n", n );
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