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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /2252/CH18/EX18.3/Ex18_3.sce | |
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initial commit / add all books
Diffstat (limited to '2252/CH18/EX18.3/Ex18_3.sce')
| -rwxr-xr-x | 2252/CH18/EX18.3/Ex18_3.sce | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/2252/CH18/EX18.3/Ex18_3.sce b/2252/CH18/EX18.3/Ex18_3.sce new file mode 100755 index 000000000..bf8b49107 --- /dev/null +++ b/2252/CH18/EX18.3/Ex18_3.sce @@ -0,0 +1,22 @@ +
+i=linspace(0,2.5,6)
+V=[0 50 84 105 120 131]
+plot(i,V)
+xtitle("Magnetization curve for example 18.3","Field Current","Generated emf")
+
+//refer Fig.18.6 in the textbook
+//OE is the field resistance line of critical resistance
+Rc=100
+//solving (iii)
+Rsh=70//field resistance
+N=750//speed in rpm
+Nc=Rsh/Rc*N
+mprintf("When the field resistance is 70 ohm, critical speed=%d rpm\n",round(Nc))
+//solving (iv)
+Eg=100//open-circuit voltage
+Rsh=55//shunt field resistance
+//now, the operating point is M instead of A
+//LM/LN=N1/N
+//from the graph, LM/LN=100/115
+N1=100/115*N//desired speed
+mprintf("With shunt field resistance of 55 ohm, reduction in speed to make the open circuit voltage equal to 100 V=%d rpm",round(N-N1))
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