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+//Chapter 5:Dc Motor Drives
+//Example 3
+clc;
+
+//Variable Initialization
+
+//Motor ratings
+V1=220     //rated voltage in V
+Ia1=200    //rated current in A
+Ra=0.06    //armature resistance in ohms
+Rb=0.04    //internal resistance of the variable source in ohms
+N1=800     //speed in rpm
+N2=600     //speed when motor is operatingin regenerative braking in rpm
+
+//Solution
+Ia2=0.8*Ia1        //motor is opereting in regenerative braking at 80% of Ia1
+E1=V1-Ia1*Ra       //back emf at rated operation
+E2=(N2/N1)*E1      //back emf at the given speed N2
+V2=E2-Ia2*(Ra+Rb)  //internal voltage of thevariable source
+
+//Results
+mprintf("\n Internal voltage of the variable source:%.1f V",V2)