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+//CHAPTER 10- THREE-PHASE INDUCTION MACHINES
+//Example 3
+
+disp("CHAPTER 10");
+disp("EXAMPLE 3");
+
+//VARIABLE INITIALIZATION
+N_r=1140;                        //full load speed in rpm
+f=60;                            //frequency in Hz
+
+//SOLUTION
+
+//solution (i)
+P=(120*f)/N_r;
+P=round(P);                     //since the number of poles cannot be a fraction 
+disp(sprintf("(i) The number of poles is %d",P));
+
+//solution (ii)
+N_s=(120*f)/P;
+s=(N_s-N_r)/N_s;
+disp(sprintf("(ii) The slip at full load is %d %%",s*100));
+
+//solution (iii)
+f_r=s*f;
+disp(sprintf("(iii) The frequency of the rotor voltge is %d Hz",f_r));
+
+//solution (iv)
+N1=(120*f_r)/P;                  //speed of rotor field w.r.t stator
+N1=round(N1);
+disp(sprintf("(iv) The speed of rotor field w.r.t rotor is %d rpm",N1));
+
+//solution (v)
+N2=N_r+N1;                       //speed of stator field w.r.t stator field
+N3=N_s-N2;                       //speed of rotor field w.r.t stator field
+disp(sprintf("(v) The speed of rotor field w.r.t stator field is %d rpm",N3));
+disp("Hence, the rotor field is stationary w.r.t stator field");
+
+//solution (vi)
+ratio=10/100;                     //since it is specified that slip is 10%
+N_r=N_s*(1-ratio);
+N_r=round(N_r);
+disp(sprintf("(vi) The speed of rotor at 10%% slip is %d rpm",N_r));
+s1=(N_s-N_r)/N_s;
+fr=s1*f;
+disp(sprintf(" The rotor frequency at this speed is %.0f Hz",fr));
+
+//solution (vii)
+v=230;
+ratio1=1/0.5;                    //stator to rotor turns ratio 
+E_rotor=v*(1/ratio1);
+E_rotor_dash=ratio*E_rotor;
+disp(sprintf("(vii) The rotor induced emf is %.1f V",E_rotor_dash));
+
+//END
+
+
+