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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)
+