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// Example 10.10
// Computation of (a) Mechanical power developed (b) Torque developed
// (c) Shaft torque
// Page No.427
clc;
clear;
close;
// Given data
T=40; // Hp rating of motor
Rf=95.3; // Field resistance
VT=240; // Rated voltade of the machine
IT=140; // Total current
Racir=0.0873; // Armature circuit resistance
n=2500; // Rated speed of the machine
// (a) The mechanical power developed
If=VT/Rf; // Field winding current
Ia1=IT-If; // Armature current
Ea=VT-Ia1*Racir; // Armature emf
Pmech=Ea*Ia1; // Mechanical power
Pmechhp=Ea*Ia1/746;
// (b) Torque developed
TD=7.04*Ea*Ia1/n;
// (c) Shaft torque
Tshaft=T*5252/n;
// Display result on command window
printf("\n Mechanical power developed= %0.0f W ",Pmech);
printf("\n Mechanical power developed= %0.1f hp ",Pmechhp);
printf("\n Torque developed = %0.1f lb-ft ",TD);
printf("\n Shaft torque = %0.1f lb-ft ",Tshaft);
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