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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 );
+
+