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+//Chapter 6:Induction Motor Drives
+//Example 13
+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
+Wms=4*%pi*f/P
+f1=60          //frequency in Hz during speed control of the motor
+K=f1/f         //the value of K at 60Hz 
+x=Rs+sqrt(Rs**2+K**2*(Xs+Xr_)**2)
+Tmax_=3/(2*K*Wms)*(Vl/sqrt(3))**2/x       //torque at 60 Hz frequency
+z=Rs+sqrt(Rs**2+(Xs+Xr_)**2)
+Tmax=3/(2*Wms)*(Vl/sqrt(3))**2/z          //maximum torque
+ratio=Tmax_/Tmax  //ratio
+
+//Result
+mprintf("Ratio of Motor breakdown torque at 60Hz to rated torque at 50Hz is:%.3f",ratio)