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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 4-5
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+slots = 120 ; // No. of armature slots
+conductors_per_slot = 6 ; 
+B = 60000 ; // Flux density in lines/sq.inches
+d = 28 ; // diameter of the armature
+l = 14 ; // axial length of the coil in inches
+A = 4 ; // No. of parallel paths
+span = 0.72 ; // Pole arcs span 72% of the armature surface
+T_a = 1500 ; // total armature torque in lb-ft
+
+// Calculation
+Z = slots * conductors_per_slot ; // No. of armature conductors
+r = ( d / 2 ) / 12 ; // radius of the armature in feet
+I_a = ( T_a * A * 1.13e7 ) / ( B * l * Z * r * span ) ; //Armature current in A
+
+// Display the result
+disp("Example 4-5 Solution : ")
+printf(" \n Ia = %.1f A ", I_a );