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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/EX4.49 | |
| 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/EX4.49')
| -rw-r--r-- | 3760/CH4/EX4.49/Ex4_49.sce | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/3760/CH4/EX4.49/Ex4_49.sce b/3760/CH4/EX4.49/Ex4_49.sce new file mode 100644 index 000000000..2dc47cbce --- /dev/null +++ b/3760/CH4/EX4.49/Ex4_49.sce @@ -0,0 +1,15 @@ +clc;
+v=250; // rated voltage of dc shunt motor
+ra=0.5; // armature resistance
+rf=250; // field resistance
+n1=600; // speed of motor
+i=21; // current drawn by motor when n=600 rpm
+re=250; // additional resistance in field circuit
+if1=v/rf; // field current
+ia=i-if1; // armature current
+Ea1=v-ia*ra; // counter EMF at n=600 rpm
+if2=v/(rf+re); // field current after addition of external resistance
+ia2=ia*(if1/if2); // armature current after addition of external resistance
+Ea2=v-ia2*ra; // counter EMF at new speed
+n2=(n1*Ea2*if1)/(Ea1*if2);
+printf('New speed of motor is %f rpm',n2);
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