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// Example 7.1
// Determine (a) Torque load on the shaft (b) Torque angle if the voltage
// drops to 224V (c) Will the rotor pull out of synchronism?
// Page No. 282
clc;
clear;
close;
// Given data
f=60; // Frequency
P=4; // Number of poles
Pshaft=10; // Shaft power in hp
V1=240; // Rated voltage
V2=224; // New voltage
phirel1=30; // Torque angle
// (a) Torque load on the shaft
ns=120*f/P; // speed of machine
Trel=Pshaft*5252/ns;
// (b) Torque angle if the voltage drops to 224V
phirel2=asind((V1^2/V2^2)*sind(2*phirel1))/2
// Display result on command window
printf("\n Torque load on the shaft = %0.2f lb-ft ",Trel);
printf("\n Torque angle if the voltage drops to 224V = %0.2f deg ",phirel2);
printf("\n Because torque angle is less than 45 degree, \n the rotor will not pull out of synchronism ")
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