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//Electric machines and power systems by Syed A Nasar
//Publisher:Tata McGraw Hill
//Year: 2002 ; Edition - 7
//Example 6.7
//Scilab Version : 6.0.0 ; OS : Windows
clc;
clear;
V=230; //supply voltage in v
Ra=.05; //armature resistance in ohms
Rf1=75; //field resistance in no load in ohms
Rf2=100; //field resistance in on load condition in ohms
I1=7;N1=1120; //no load current and speed
I2=46; //on load current in A
If=V/Rf1;
Ia1=I1-If;
K=(V-Ia1*Ra)/(N1*If);
Ia2=I2-If;
N=(V-Ia2*Ra)/(If*K);
If1=V/Rf2;
Ia0=I2-If1;
n=(V-Ia0*Ra)/(If1*K);
printf('the motor speed at line current of 46 A is %f rpm\n',N)
printf('the new motor speed is %f rpm',n)
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