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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 4: DC Dynamo Torque Relations-DC Motors
+// Example 4-16
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+V_a = 230 ; // Rated armature voltage in volt
+P = 10 ; // Rated power in hp
+S = 1250 ; // Rated speed in rpm
+R_A = 0.25 ; // Armature resistance in ohm
+R_p = 0.25 ; // Interpolar resistance
+BD = 5 ; // Brush voltage drop in volt
+R_s = 0.15 ; // Series field resistance in ohm
+R_sh = 230 ; // Shunt field resistance in ohm
+
+// shunt connection
+I_l = 54 ; // Line current in A at rated load 
+I_ol = 4 ; // No-load line current in A
+S_o = 1810 ; // No-load speed in rpm
+
+// Calculations
+R_a = R_A + R_p ; // Effective armature resistance in ohm
+I_f = V_a / R_sh ; // Field current in A ( Shunt connection )
+I_a = I_ol - I_f ; // Armature current in A
+
+E_c_o = V_a - ( I_a * R_a + BD ); // No-load BACK EMF in volt
+E_c_full_load = V_a - ( I_l * R_a + BD ); // No-load BACK EMF in volt at full-load
+
+S_r = S_o * ( E_c_full_load / E_c_o ); // Speed at rated load
+
+P_d = E_c_full_load * I_l ; // Internal power in watts
+hp = P_d / 746 ; // Internal horse power
+
+// Display the results
+disp("Example 4-16 Solution : ");
+printf(" \n a: S_r = %d rpm\n ", S_r );
+printf(" \n b: P_d = %d W ", P_d );
+printf(" \n    hp = %.1f hp ", hp );