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+//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 6
+//example 6.7
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+Ra=2;//armature resistance in ohm
+Rf=3;//field resistance in ohm
+V=320;//terminal voltage in volt
+T=60;//full load torque in Nm
+n=600;//motor speed in rpm
+mprintf("\nCalculate the field current:")
+KC=0.248;//calculated by solving two equations
+Ia=sqrt(T/KC);
+mprintf("\nThe field current is %f A",Ia)
+mprintf("\nCalculate the motor voltage:")
+n1=400;
+omega1=(2*%pi*n1)/T;
+Vt=Ia*(Ra+Rf+(KC*omega1));
+mprintf("\nThe motor voltage is %f volt",Vt)
+mprintf("\nCalculate the motor speed :")
+AR=Ra/Rf;
+Ia=sqrt(T/(KC*AR));
+w=(V/(KC*AR*Ia))-((Ra+(AR*Rf))/(KC*AR));
+n2=(w*T)/(2*%pi);
+mprintf("\nThe speed of the motor is %f rpm",n2)