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//Electric machines and power systems by Syed A Nasar
//Publisher:Tata McGraw Hill
//Year: 2002 ; Edition - 7
//Example 6.10
//Scilab Version : 6.0.0 ; OS : Windows
clc;
clear;
v=230; //supply voltage in v
I1=80; //line current in A
N1=750; //speed at I1 in rpm
n=15; //number of turns per pole
Rf=0.11; //field resistance in ohm
Ra=0.14; //armature resistance in ohms
I2=20; //line current in A
E1=v-I1*(Rf+Ra);
E2=v-I2*(Rf+Ra);
At1=n*I1;
At2=n*I2;
phi1=4.3*10^3;phi2=1.4*10^3; //from Appendix 3 in wb
N2=N1*E2*phi1/(E1*phi2);
printf('The motor speed at I2 is %f rpm',N2)
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