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+// Example 11.6
+// Determine (a) Torque developed when operating at rated speed (b) Developed 
+// torque required at half rated speed (c) Armature voltage required for half 
+// rated speed 
+// Page No. 460
+
+clc;
+clear;
+close;
+
+// Given data
+
+VT=750;                   // Voltage value of motor
+Nf=1231;                  // Turns per pole of the shunt motor
+Ra=0.00540;               // Armature resistance
+RIPcw=0.00420;            // Interpole winding resistance
+N=955;                    // Speed of shunt motor
+Ia1=1675;                 // Armature current
+
+// (a) Torque developed when operating at rated speed 
+
+Racir=Ra+RIPcw;
+Ea=VT-Ia1*Racir;
+Pmech=Ea*Ia1;
+TD=Pmech*5252/N/746;
+
+// (b) Developed torque required at half rated speed 
+
+T2=TD*(0.5*N/N)^2;
+
+// (c) Armature voltage required for half rated speed 
+
+Ia2=T2*Ia1/TD;
+V2=(0.5*N/N)*(VT-Ia1*Racir) + Ia2*Racir ;
+
+// Shaft load is adjusted to  value that limits the armature current to 115 % of rated current
+
+//Display result on command window
+printf("\n Torque developed when operating at rated speed = %0.1f lb-ft ",TD);
+printf("\n Developed torque required at half rated speed = %0.1f lb-ft  ",T2);
+printf("\n Armature voltage required for half rated speed = %0.1f V ",V2);