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+// Example 8.4
+// Determine (a) Developed torque if the field current is adjusted so that the
+// excitation voltage is equal to two times the applied stator voltage, and the
+// power angle is -18 degrees (b) Developed torque in percent of rated torque, 
+// if the load is increased until maximum reluctance torque occurs.
+// Page No. 328
+
+clc; 
+clear;
+close;
+
+// Given data
+Vt1ph=2300/sqrt(3);         // Applied voltage/phase
+Ef1ph=2300/sqrt(3);         // Excitation voltage/phase
+Xd=36.66;                   // Direct axis reactance/phase
+delta=-18;                  // Power angle
+Xq=23.33;                   // Quadrature-axis reactance/phase
+n=900;                      // Speed of motor
+deltanew=-45;
+RatTor=200;                 // Rated torque of motor
+// (a)  Developed torque
+Pmag1ph=-((Vt1ph*2*Ef1ph)/Xd)*sind(delta);  // Power 
+Prel1ph=-Vt1ph^2*( (Xd-Xq) / (2*Xd*Xq)) *sind(2*delta); // Reluctance power
+Psal3ph=3*(Pmag1ph+Prel1ph);  // Salient power of motor
+Psal3phHP=Psal3ph/746;
+T=(5252*Psal3phHP)/n;         // Developed torque
+
+// (b) Developed torque in percent of rated torque
+// The reluctance torque has its maximum value at delta= -45 degrees
+Pmag1phnew=-((Vt1ph*2*Ef1ph)/Xd)*sind(deltanew); // Power
+Prel1phnew=-Vt1ph^2*( (Xd-Xq) / (2*Xd*Xq)) *sind(2*deltanew); // Reluctance power
+Psal3phnew=3*(Pmag1phnew+Prel1phnew);  // Salient power of motor
+Psal3phHPnew=Psal3phnew/746;
+PerRatTorq=Psal3phHPnew*100/RatTor;
+
+// Display result on command window
+printf("\n Developed torque  = %0.0f lb-ft ",T);
+printf("\n Developed torque in percent of rated torque = %0.0f Percent ",PerRatTorq);