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+//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi 
+//chapter 5
+//example 5.6
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+V=2300;                        //rated voltage of the synchronous motor in volt
+Vt=V/3^(1/2);
+f=60;                         //frequency in Hertz
+p=6;                         //number of poles
+Tl=5000;                    //constant torque of the load in Nm
+Xs=6;                      //synchronous reactance of the motor in ohm
+ns=(120*f)/p;              //synchronous speed of the motor in rpm
+omegas=(2*%pi*ns)/60;
+Ef=(Tl*omegas*Xs)/(3*Vt);     //The minimum excitation that machine must maintain to provide the needed torque
+disp(Ef,'The minimum excitation that machine must maintain to provide the needed torque in volt is:')