1 files changed, 20 insertions, 0 deletions
diff --git a/3811/CH9/EX9.3/Ex9_3.sce b/3811/CH9/EX9.3/Ex9_3.sce
new file mode 100644
index 000000000..df2e842da
--- /dev/null
+++ b/3811/CH9/EX9.3/Ex9_3.sce
@@ -0,0 +1,20 @@
+//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 9
+//example 9.3
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+Ra=.5;//armature resistance in ohm
+KQ=3;//field constant
+V=277;//source voltage in volt
+Tup=100;//upward directional load torque in Nm
+a=20;//triggering angle in degree
+Tdw=200;//downward directional load torque in Nm 
+Vm=V*sqrt(2);
+Veq=((2*Vm)/%pi)*cosd(a);
+omega1=((Veq/KQ))-((Ra*Tup)/KQ^(2));
+n1=omega1*(60/(2*%pi));//downward speed in rpm
+b1=((-KQ*omega1)+((Ra*Tdw)/KQ))/((2*Vm)/%pi);
+alpha2=acosd(b1);
+mprintf("The triggering angle required to keep the downward speed equal in magnitude to the upward speed in degree is %f",alpha2)