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Diffstat (limited to '3811/CH9/EX9.5/Ex9_5.sce')
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1 files changed, 20 insertions, 0 deletions
diff --git a/3811/CH9/EX9.5/Ex9_5.sce b/3811/CH9/EX9.5/Ex9_5.sce new file mode 100644 index 000000000..44dccd75b --- /dev/null +++ b/3811/CH9/EX9.5/Ex9_5.sce @@ -0,0 +1,20 @@ +//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 9
+//example 9.5
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+Ra=1;//armature resistance in ohm
+KQ=3;//field constant
+V=320;//Terminal voltage in volts
+n=1000;//motor speed in rpm
+omega=(2*%pi*n)/60;
+Ea1=KQ*omega;
+Ia=(V-Ea1)/Ra;//normal field current in ampere
+Ib=2*Ia;//maximum braking current which is twice the armature voltage in A
+Rb=-(V+Ea1+(Ib*Ra))/Ib;//braking resistance
+Rb=abs(Rb);
+mprintf("The maximum braking resistance in ohm is %f",Rb)
+//the answer given in the book is wrong
+
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