1 files changed, 19 insertions, 0 deletions
diff --git a/3760/CH4/EX4.44/Ex4_44.sce b/3760/CH4/EX4.44/Ex4_44.sce
new file mode 100644
index 000000000..9f09c2a59
--- /dev/null
+++ b/3760/CH4/EX4.44/Ex4_44.sce
@@ -0,0 +1,19 @@
+clc;
+v=200; // rated voltage of dc shunt motor
+ra=0.1; // armature resistance
+n=1000; // running speed of motor
+ia=50; // armature current at n=1000 rpm
+re=0.1; // reduction in field flux
+disp('case a'); 
+Ea1=v-ia*ra; // initial counter EMF
+Ea2=Ea1*(1-re); // counter EMF after reduced field flux
+iam=(v-Ea2)/ra; 
+printf('Maximum value of armature current is %f A\n',iam);
+T=(iam/ia)*(1-re); 
+printf('Torque corresponding to maximum armature current is %f times initial torque\n',T);
+disp('case b');
+ia2=(1/(1-re))*ia;
+printf('Armature current when transients are over is %f A\n',ia2);
+Ea2=v-ia2*ra; // counter EMF when transients are over
+n2=(Ea2*n)/(Ea1*(1-re));
+printf('Ultimate speed after transients are over is %f rpm',ceil(n2));