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//Rated torque calculation by resistance addition
clc;
clear;
V=240;
I=40;
Ra=0.3;
N1=1500/60;// speed in rotations per sec
N2=1000/60;
Pi=V*I;// Power input
Pc=(I^2)*Ra; // Copper loss
Po=Pi-Pc;
T=Po/(2*%pi*N1);// Rated torque
R1=V/I; // Back EMF is zero
Rex1=R1-Ra;
//Eb directly to N(speed)
Eb1500=V-(I*Ra);
Eb1000=N2*Eb1500/N1;
R=poly([0 1],'R','c');
x=(V-Eb1000)-(I*(R+Ra)); // Characteristic equation to find external resistance
Rex2=roots(x);
printf('The value of the resistance to be added to obtain rated torque \n')
printf('a) At starting = %g ohms\n',Rex1)
printf('b) At 1000 rpm = %g ohms\n',Rex2)
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