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// Example 10.9
// Computation of (a) Steady state armature current if a rheostat in the
// shunt field circuit reduces flux in air gap to 75% of its rated value
// (b) Steady state speed for the conditions in (a)
// Page No. 421
clc;
clear;
close;
// Given data
Rf=160; // Field resistance
VT=240; // Rated voltade of the machine
IT=37.5; // Total current
Ra=0.213; // Armature resistance
Rip=0.092; // Resistance of interpolar winding
Rcw=0.065; // Resistance of compensating windings
n1=2500; // Rated speed of the machine
// (a) At rated conditions
If=VT/Rf; // Field current
Ia1=IT-If; // Armature current
Ia2=Ia1*0.50*1/0.75;
// (b) steady state speed for the above mentioned conditions
Racir=Ra+Rip+Rcw;
n2=n1*(VT-(Ia2*(1+Racir)))/0.75*(1/(VT-(Ia1*Racir)));
// Display result on command window
printf("\n Steady state armature current = %0.1f A ",Ia2);
printf("\n Steady state speed = %0.0f r/min ",n2);
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