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Diffstat (limited to '2252/CH19/EX19.13/Ex19_13.sce')
| -rwxr-xr-x | 2252/CH19/EX19.13/Ex19_13.sce | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/2252/CH19/EX19.13/Ex19_13.sce b/2252/CH19/EX19.13/Ex19_13.sce new file mode 100755 index 000000000..e8416ea15 --- /dev/null +++ b/2252/CH19/EX19.13/Ex19_13.sce @@ -0,0 +1,14 @@ +
+V=250//voltage applied to the motor
+Eb1=V//Ra is negligible
+N1=500//speed in rpm
+Ia1=40//armature current
+R=25//additional resistance
+//as flux remains same, back emf is directly proportional to speed; and torque is directly proportional to armature current
+//Eb2=250-Ia2*25, N2=500-50*Ia2
+//also, torque varies as cube of speed
+//from these conditions, we get, Ia2^3-30*Ia2^2+325*Ia2-1000=0
+//solving this equation, we get
+Ia2=5
+N2=(Ia2/Ia1)^(1/3)*N1
+mprintf("Speed of the motor with 25 ohm resistor in the armature circuit=%d rpm",N2)
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