diff options
Diffstat (limited to '3760/CH4/EX4.45/Ex4_45.sce')
| -rw-r--r-- | 3760/CH4/EX4.45/Ex4_45.sce | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/3760/CH4/EX4.45/Ex4_45.sce b/3760/CH4/EX4.45/Ex4_45.sce new file mode 100644 index 000000000..46ee3ce95 --- /dev/null +++ b/3760/CH4/EX4.45/Ex4_45.sce @@ -0,0 +1,14 @@ +clc;
+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
+ia2=(1/(1-re))*ia; // armature current when transients are over
+Ea1=v-ia2*ra; // counter EMF when transients are over
+// with sudden increase from 0.9*f to f (f=flux), counter EMF rises to
+Ea2=Ea1*(1/(1-re));
+i=(v-Ea2)/ra;
+printf('Armature current is %f A',i);
+disp('Since armature current is negative, machine acts as a generator. Speed reduces till counter EMF becomes less than supply voltage,so that motor action takes place and torque balance is obtained')
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