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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 );