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| author | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
|---|---|---|
| committer | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
| commit | 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 (patch) | |
| tree | dbb9e3ddb5fc829e7c5c7e6be99b2c4ba356132c /3760/CH4/EX4.55 | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
| download | Scilab-TBC-Uploads-7f60ea012dd2524dae921a2a35adbf7ef21f2bb6.tar.gz Scilab-TBC-Uploads-7f60ea012dd2524dae921a2a35adbf7ef21f2bb6.tar.bz2 Scilab-TBC-Uploads-7f60ea012dd2524dae921a2a35adbf7ef21f2bb6.zip | |
initial commit / add all books
Diffstat (limited to '3760/CH4/EX4.55')
| -rw-r--r-- | 3760/CH4/EX4.55/Ex4_55.sce | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/3760/CH4/EX4.55/Ex4_55.sce b/3760/CH4/EX4.55/Ex4_55.sce new file mode 100644 index 000000000..e294b6705 --- /dev/null +++ b/3760/CH4/EX4.55/Ex4_55.sce @@ -0,0 +1,22 @@ +clc;
+v=250; // rated voltage of dc series motor
+ra=0.25; // armature resistance
+rf=0.15; // series field resistance
+disp('case a');
+t=80; // developed torque
+n1=1200; // speed at developed torque
+// solving quadratic equation in ia
+t1=ra+rf;
+t2=-v;
+t3=(t*2*%pi*n1)/60;
+p=[ t1 t2 t3];
+ia=roots(p);
+printf('Current for developing given torque is %f A\n',ia(2));
+disp('case b');
+n2=1800;
+ia2=ia(2)/2;
+Ea1=v-ia(2)*(ra+rf); // counter EMF corresponding to armature current of case 1
+Ea2=v-ia2*(ra+rf); // counter EMF corresponding to armature current ia2
+fr=(n1*Ea2)/(n2*Ea1); // ratio of fluxes for two armatures current
+pr=(1-fr)*100;
+printf('Percentage reduction in flux is %f pecent',pr);
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