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+//CHAPTER 10- THREE-PHASE INDUCTION MACHINES
+//Example 15
+
+disp("CHAPTER 10");
+disp("EXAMPLE 15");
+
+//VARIABLE INITIALIZATION
+P=4;                             //number of poles
+f_s=50;                          //in Hertz
+f_l=20;                          //in Hertz
+
+//SOLUTION
+
+//solution (a)
+N1=(120*f_s)/P;                  //speed of rotor field w.r.t. stator structure
+N2=(120*f_l)/P;                  //speed of rotor field w.r.t. rotor structure
+N_r1=N1-N2;
+N_r2=N1+N2;
+disp("(a) The prime mover should should drive the rotor at two speeds-"); 
+disp(sprintf("At %d rpm in the direction of stator field",N_r1));
+disp(sprintf("At %d rpm against the direction of stator field",N_r2));
+
+//solution (b)
+s1=(N1-N_r1)/N1;
+s2=(N1-N_r2)/N1;
+ratio=s1/s2;                     //all other parameters in the expressions of the two voltages are equal
+disp(sprintf("(b) The ratio of the two voltages at the two speeds is %d",ratio));
+
+//solution (c)
+//for rotor speed N_r=900 rpm clockwise, the stator field is running at 600 rpm clockwise. The phase sequence be abc
+//for rotor speed N_r=2100 rpm clockwise, the stator field is running at 600 rpm anticlockwise. The phase sequence be acb
+//Therefore, the phase sequence is reversed.
+disp("(c) The poles sequence of -3Φ rotor voltage do not remain the same");
+
+//END