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+// Example 5.3
+// Computation of (a) Speed at which maximum torque is developed (b) Maximum 
+// torque that the machine can develop (c) Rated shaft torque (d) Which NEMA 
+// design fits this motor?
+// Page No. 184
+
+clc;
+clear;
+close;
+
+// Given data
+f=60;                  // Frequency in Hz
+p=4;                   // Number of poles
+hp=40;                 // Horsepower
+n=1751;                // Rated speed of machine
+v=460/sqrt(3);       // Voltage
+s=0.1490;              // Slip
+R2=0.153;              // Rotor resistance 
+R1=0.102;
+X1=0.409;              // Rotor reactance
+X2=0.613;
+
+// (a) Speed at which maximum torque is developed 
+STDmax=R2/(sqrt(R1^2+(X1+X2)^2));
+ns=120*f/p;                          //stator spped
+nr=ns*(1-s);
+
+// (b) Maximum torque that the machine can develop
+TDmax=(21.12*v^2)/(2*ns*(sqrt(R1^2+(X1+X2)^2)+R1));
+
+// (c) Rated shaft torque
+TDshaft=hp*5252/n;
+
+// Display result on command window
+printf("\n Speed at which maximum torque is developed = %0.0f r/min ",nr);
+printf("\n Maximum torque that the machine can develop = %0.1f lb-ft ",TDmax);
+printf("\n Rated shaft torque = %0.1f lb-ft ",TDshaft);
+printf("\n Maximum torque is developed at slip of 0.1490 and \n hence machine is placed in design A category ");