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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/EX4.46 | |
| 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/EX4.46')
| -rw-r--r-- | 3760/CH4/EX4.46/Ex4_46.sce | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/3760/CH4/EX4.46/Ex4_46.sce b/3760/CH4/EX4.46/Ex4_46.sce new file mode 100644 index 000000000..a3934172b --- /dev/null +++ b/3760/CH4/EX4.46/Ex4_46.sce @@ -0,0 +1,12 @@ +clc;
+v=220; // supply voltage
+n1=2000; // speed of fan motor
+ia1=60; // current corresponding to n=2000 rpm
+// flux is directly proportional to exciting current and load torque increase as square of speed
+// four field coils are connected in two parallel groups also n^2 is directly proportional to armature current therefore
+r=sqrt((2*ia1^2)/n1^2); // ratio of armature current corresponding to n2 and n2 where n2=new speed
+// counter EMF are directly proportional to product n*ia and ra(armature resistance) and rs(series) resistance are not given, therefore takig ratio of n1*ia1 and n2*ia2 we can determine value of n2
+n2=sqrt((ia1*n1*2)/r);
+printf('New speed is %f rpm\n',n2);
+ia2=n2*r;
+printf('New armature current is %f A\n',ia2);
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