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+//Book Name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 11
+//example 11.9
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+V=480;//terminal voltage in volt
+n=1120;//related full load speed of the motor in rpm
+R1=1;//stator resistance in ohm
+R2=1;//rotor resistance referred to stator in ohm
+Xeq=5;//equivalent winding resistance in ohm
+J=4;//inertia of the motor in NM sec^2
+ns=1200;//nearest synchronous speed of the motor in rpm
+K=1.196;
+rps=ns/60;
+omegas=(2*%pi*rps);
+s1=2;
+s2=1;
+Tmax=V^(2)/(2*omegas*(R1+sqrt(R1^(2)+Xeq^(2))));
+tau=(J*omegas)/Tmax;
+smax=sqrt((s2^2-s1^2)/(((-log(s1/s2))-(2*(s1-s2)))*2));//the equation is obtained by differentiating tbr with respect to smax
+Radd=(smax*sqrt(R1^2+Xeq^2))-R2;//equation to find the Radd
+mprintf("\nThe value of braking resistance to minimize the braking time is %f ohm",Radd)