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// Example 10.4
// Computation of percentage reduction in field flux required to obtain a
// speed of 1650 r/min while drawing an armature current of 50.4 A.
// Page No. 405
clc;
clear;
close;
// Given data
VT=240; // Induced emf
R=95.2; // Shunt field resistance
IT=72; // Total current
Ra=0.242; // Armature resistance
Ia2=50.4; // Armature current
n1=850; // Rated speed of shunt motor
n2=1650; // Speed of armature winding
// Percentage reduction in field flux
If1=VT/R; // Field current
Ia1=IT-If1; // Armature current
Ea1=VT-Ia1*Ra; // Armature emf
Ea2=VT-Ia2*Ra;
phip2=(n1/n2)*(Ea2/Ea1);
PerRed=(phip2-1)*100;
// Display result on command window
printf("\n Percentage reduction in field flux = %0.1f Percent ",PerRed);
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