initial commit / add all books

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+clc;

+v=220; // rated voltage of motor

+i=15; // rated current of motor

+ra=0.4; // net armature resistance

+n=1500; // speed for which magnetization curve is given

+IF=[ 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.2 1.45];

+EA=[120 160 197 210 220 228 232 236 243 248];

+plot(IF,EA);

+xlabel('field current');

+ylabel('voltage');

+title('magnetising curve');

+disp('case a');

+ifg1=0.15; // initial generator field current

+ifg2=1.4; //  final generator field current

+ifm=0.6; // motor field current

+// corresponding ifg1 counter EMF of generator from magnetization curve is 

+Ea1=60;

+vd=i*(ra+ra); // voltage drop in two armature resistance

+Ea2=Ea1-vd; // counter EMF of motor

+// but motor counter EMF for 0.6 A field current at 1500 rpm is

+Ea3=210; 

+nmin1=(Ea2/Ea3)*n; // minimum motor speed

+// corresponding ifg2 counter EMF of generator from magnetization curve is 

+Ea4=247;

+Ea5=Ea4-vd; // counter EMF of motor

+nmax1=(Ea5/Ea3)*n; // maximum motor speed

+sr=nmax1/nmin1; // speed range

+printf('Speed range for full load armature current is %f:1\n',sr);

+// for no load generator counter EMF= motor counter EMf

+nmin2=(Ea1/Ea3)*n; // minimum motor speed

+pr=((nmin2-nmin1)/nmin2)*100;

+printf('Percent speed drop from no load to full load for condition of minimum speed is %f percent\n',pr);

+// for maximum generator field current generator counter EMF= motor counter EMf at no load

+nmax2=(Ea4/Ea3)*n; // maximum motor speed

+sr=nmax2/nmin2; // speed range

+printf('Speed range for full load armature current is %f:1\n',sr);

+pr=((nmax2-nmax1)/nmax2)*100;

+printf('Percent speed drop from no load to full load for condition of maximum speed is %f percent\n',pr);

+disp('case b')

+// for generator field current=1 A counter EMF from magnetization curve is 

+Ea6=236;

+Ea7=Ea6-vd; // motor counter EMF at full load

+Ea8=(Ea7/(2*nmax1))*n; 

+printf('Motor counter EMF for %f rpm is %f V\n',n,Ea8);

+// Corresponding to Ea8, field current is 

+ifmi=0.25;

+printf('Minimum motor field current is %f A\n',ifmi);