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+//Chapter 2:Dynamics of Electric Drives

+//Example 3

+clc;

+

+//Variable Initialization

+Tlh=1000     // load torque in N-m

+Tmax=700     // maximum motor torque

+Tll=200      // light load for the motor to regain its steady state

+Tmin=Tll     // minimum torque

+t_h=10       // period for which a load torque of 1000 N-m is apllied in sec

+Jm=10        // moment of inertia of the motor in Kg-m2

+No=500       // no load speed in rpm

+Tr=500       // torque at a given no load speed in N-m

+

+//Solution

+Wmo=No*2*%pi/60 // angular no load speed in rad/sec

+s=0.05              // slip at a torque of 500 N-m

+Wmr=(1-s)*Wmo       // angular speed at a torque of 500 N-m in rad/sec

+

+y=log((Tlh-Tmin)/(Tlh-Tmax))

+x=Tr/(Wmo-Wmr)

+

+J=x*t_h/y

+Jf=J-Jm

+

+//Result 

+//Answer Provided in the textbook is wrong

+mprintf("\n\nMoment of inertia of the flywheel : %.1f Kg-m2",Jf)