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+//Chapter-3, Example 3.7, Page 3.18

+//=============================================================================

+clc

+clear

+

+//INPUT DATA

+P=6;//Number of poles

+f=50;//Supply frequency in Hz

+R2=0.4;//Rotor reisitance in ohm

+X2=4;//Rotor standstill reactance in ohm

+T1=2;//Ratio of maximum torque to starting torque

+

+//CALCULATIONS

+Ns=(120*f)/P;//Synchronous speed in rpm

+Sm=(R2/X2);//Slip at maximum torque

+NTM=(Ns*(1-Sm));//Speed of the motor at maximum torque in rpm

+T=((R2^2+X2^2)/(2*R2*X2));//Ratio of maximum torque to starting torque

+Rext=(sqrt(X2^2/((2*T1)-1))-R2);//Additional resistance required for the ratio of maximum torque to the statring torque to be 2 in ohm

+

+//OUTPUT

+mprintf('a)Speed of the motor at maximum torque is %i rpm \n b)Ratio of maximum torque to starting torque is %3.2f \n c)Additional resistance required for the ratio of maximum torque to the starting torque to be 2 is %3.1f ohm',NTM,T,Rext)

+

+//=================================END OF PROGRAM==============================