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//Calculating full load rotor loss and rotor input and output torque
//Chapter 4
//Example 4.20
//page 311
clear;
clc;
disp("Example 4.20")
hp=20;
P=4; //number of poles
f=50;
S=0.03; //slip
MSO=hp*735.5; //motor shaft output
losses=0.02*MSO //friction and windage loss in watts
Pd=MSO+losses; //power developed by the rotor in watts
RCL=(S*Pd)/(1-S); //rotor I^2*R loss
printf("rotor copper loss=%fW",RCL);
Ri=Pd+RCL //rotor iron loss is neglected
printf("\nRotor input=%fW",Ri);
Ns=(120*f)/P;
Nr=Ns*(1-S)*(1/60); //rotor speed in rps
OT=MSO/(2*3.14*Nr); //outp[ut torque in Nm
printf("\noutput torque=%fNm",OT)
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