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+//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 9
+//example 9.7
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+Ra=1;//armature resistance in ohm
+KQ=3;//field constant
+V=480;//Terminal voltage in volts
+Tl=120;//load torque in Nm
+Vm=V*sqrt(2);
+Iave1=Tl/KQ;
+omega3=0;//motor speed at holding condition
+Iave3=-Iave1;
+b1=((KQ*omega3)+(Ra*Iave3))/-((2*Vm)/%pi);
+alpha2=acosd(b1);
+mprintf("The triggering angle for scr 3 and 4 in degree is %f",alpha2)