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+//Chapter 5:Dc Motor Drives
+//Example 13
+clc;
+
+//Variable Initialization
+
+//Ratings of the separately excited motor
+V=200    // rated voltage in V
+N=875    // rated speed in rpm
+Ia=150   // rated current in A
+Ra=0.06  // armature resistance in ohms
+Vs=220   // source voltage in V
+f=50     // frequency of the source voltage in Hz
+
+//Solution
+E=V-Ia*Ra            //back emf
+Vm=sqrt(2)*Vs   //peak voltage
+
+//(i)When the speed is 750 rpm and at rated torque
+N1=750         //given speed in rpm
+E1=N1/N*E      //back emf at the given speed N1
+Va=E1+Ia*Ra    //terminal voltage
+cos_alpha=Va*%pi/2/Vm
+alpha=acos(cos_alpha)   //required firing angle in radian
+alpha1=alpha*180/%pi    //required firing angle in degrees
+
+//(ii)When the speed is -500rpm and at rated torque
+N1=-500         //given speed in rpm
+E1=N1/N*E       //back emf at the given speed N1
+Va=E1+Ia*Ra     //terminal voltage
+cos_alpha=Va*%pi/2/Vm
+alpha=acos(cos_alpha)   //required firing angle in radian
+alpha2=alpha*180/%pi    //required firing angle in degrees
+
+//(iii)When the firing angle is 160 degrees
+alpha=160    //firing angle in degrees
+alpha=alpha*%pi/180
+Va=2*Vm/%pi*cos(alpha)
+E1=Va-Ia*Ra    //since Va=E1+Ia*Ra
+N1=E1/E*N      //the required speed at the given firing angle
+
+//Results
+mprintf("(i)Hence the required firing angle is :%.1f °",alpha1)
+mprintf("\n(ii)Hence the required firing angle is :%.1f °",alpha2)
+mprintf("\n(iii)Hence the required speed is :%.1f rpm",N1)