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+// FUNDAMENTALS OF ELECTICAL MACHINES 
+// M.A.SALAM 
+// NAROSA PUBLISHING HOUSE 
+// SECOND EDITION
+
+// Chapter 7 : THREE-PHASE INDUCTION MOTOR
+// Example : 7.1
+
+clc;clear; // clears the console and command history 
+
+// Given data
+V = 230      // supply voltage in V
+P = 4       // number of poles
+f = 50      // frequecny Hz
+N_l = 1445  // speed in rpm
+
+// caclulations 
+N_s = 120*f/P      // synchronous speed in rpm
+s = (N_s-N_l)/N_s  // slip
+f_r = s*f          // rotor frequency in Hz
+
+// display the result 
+disp("Example 7.1 solution");
+printf(" \n Synchronous speed \n N_s = %.1f rpm \n", N_s);
+printf(" \n Slip \n s = %.4f \n", s);
+printf(" \n Rotor frequency \n f_r = %.1f Hz \n", f_r);
+