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+//Chapter 6:Induction Motor Drives
+//Example 12
+clc;
+
+//Variable Initialization
+
+//Ratings of the star connected Induction motor are same as that of Ex-6.9
+f=50           // frequency in HZ
+Vl=400         //line voltage in V
+P=4            // number of poles
+N=1370         //rated speed
+
+//Parameters referred to the stator
+Xr_=3.5        // rotor winding reactance in ohm
+Xs=Xr_         // stator winding reactance in ohm
+Rr_=3          // resistance of the rotor windings in ohm
+Rs=2           // resistance of the stator windings in ohm
+
+//Solution
+Ns=120*f/P     //synchronous speed
+N1=Ns-N        //increase in speed from no load to full torque rpm
+
+//(i)When f1=30Hz and 80% of full load
+Ns=120*f/P
+f1=30          //frequency 
+N2=0.8*N1      //increase in speed from no load to 80% of full torque rpm
+Ns1=f1/f*Ns
+N=Ns1+N2       //machine speed
+
+//(ii)At a speed of 1000rpm
+N2=1000         //given speed in rpm
+N3=N2-N1        //synchronous speed
+f3=P*N3/120     //required frequency
+
+//(iii)When frequency is 40Hz and speed is 1300 rpm
+f4=40          //frequency in hz
+N2=1300        //speed in rpm
+Ns=120*f4/P    //required synchronous speed in rpm
+N4=N2-Ns       //increase in speed from no load speed in rpm
+Tf=25.37       //full load torque as calculated in Ex-6.11
+Tm=-N4/N1*Tf   //motor torque
+
+//(iv) when the motor is under dynamic braking
+
+
+//Results
+
+mprintf("(i)Required speed is :%d rpm",N)
+mprintf("\n(ii)Required frequency is:%d Hz",f3)
+mprintf("\n(iii)Required motor torque :%.2f N-m",Tm)
+mprintf("\n(iv)The value of the frequency,speed and motor torque calculated in (i),(ii) and(iii)")
+mprintf("    \nwill be the same when the motor is operated under dynamic braking")