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+// FUNDAMENTALS OF ELECTICAL MACHINES 
+// M.A.SALAM 
+// NAROSA PUBLISHING HOUSE 
+// SECOND EDITION
+
+// Chapter 6 : CONTROL AND STARTING OF A DC MOTORS
+// Example : 6.2
+
+clc;clear; // clears the console and command history 
+
+// Given data
+V_t = 230   // supply voltage in V
+I_a1 = 15   // dc shunt motor armature current in A
+N_1 = 650   // speed in rpm
+R_a = 0.4   // armature resistance in ohm
+R = 1       // variable resistance in series with the armature
+
+// caclulations 
+// at full load 
+E_b1 = V_t-I_a1*R_a       // initial back emf in V
+E_b2 = V_t-I_a1*(R+R_a)   // final back emf in V
+N_2 = N_1*(E_b2/E_b1)     // speed at full load in rpm
+
+// at half load
+I_a21 = I_a1/2               // armature current in A
+E_b21 = V_t-I_a21*(R+R_a)    // back emf in V
+N_21 = N_1*(E_b21/E_b1)      // speed at half load torque in rpm
+
+
+
+// display the result 
+disp("Example 6.2 solution");
+printf(" \n speed at full load \n N_2 = %.1f rpm \n", N_2);
+printf(" \n speed at half load torque \n N_21 = %.1f rpm \n", N_21);
+