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+// FUNDAMENTALS OF ELECTICAL MACHINES 
+// M.A.SALAM 
+// NAROSA PUBLISHING HOUSE 
+// SECOND EDITION
+
+// Chapter 10 : SYNCHRONOUS MOTOR
+// Example : 10.1
+
+clc;clear; // clears the console and command history 
+
+// Given data
+V = 2.5*10^3 // supply voltage in V
+R_r = 0.12   // per phase resistance in ohm
+X_r = 3.2    // syncronous reactance in ohm
+I_a = 185    // line current in A
+pf = 0.8     // leading power factor
+
+// caclulations
+phi = acosd(pf)
+V_t = V/sqrt(3)    // terminal voltage per phase in V
+Z_s = R_r+%i*X_r   // impedance per phase ohm
+beta = atand(X_r/R_r)
+E_r = I_a*Z_s      // resultant voltage due to impedance in V
+E_f = sqrt(V_t^2+abs(E_r)^2-2*V_t*abs(E_r)*cosd(beta+phi)) // excitation voltage per phase in V
+
+
+// display the result  
+disp("Example 10.1 solution"); 
+printf(" \n Excitation voltage per phase \n E_f = %.2f V \n", E_f );
+