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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/EX4.74/Ex4_74.sce | |
| 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/EX4.74/Ex4_74.sce')
| -rw-r--r-- | 3760/CH4/EX4.74/Ex4_74.sce | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/3760/CH4/EX4.74/Ex4_74.sce b/3760/CH4/EX4.74/Ex4_74.sce new file mode 100644 index 000000000..aca6ba82f --- /dev/null +++ b/3760/CH4/EX4.74/Ex4_74.sce @@ -0,0 +1,22 @@ +clc;
+v=400; // rated voltage of dc shunt motor
+io=5; // current at no load
+ra=0.5; // armature resistance
+rf=200; // field resistance
+i=50; // current at full load
+ifl=v/rf; // constant shunt field current
+iao=io-ifl; // no load armature current
+wo=v*iao-iao^2*ra; // no load rotational losses
+ia=i-ifl; // full load armature current
+la=ia^2*ra; // full load armature circuit losses
+lf=v*ifl; // constant shunt feld losses
+tl=la+lf+wo; // total field losses
+pi=i*v; // motor input at full load
+nm=(1-(tl/pi))*100;
+printf('Output power is %f KW\n',(pi-tl)/1000);
+printf('Efficiency on full load is %f percent\n',nm);
+Ea1=v-iao*ra; // no load counter EMF
+Ea2=v-ia*ra; // full load counter EMF
+pr=((Ea1-Ea2)/Ea1)*100; // Ea is directly proportioal to speed so percentage change in Ea is same as percentage in speed;
+
+printf('Percentage change in speed from no load to full load is %f percent',pr);
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