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// Electric Machinery and Transformers
// Irving L kosow
// Prentice Hall of India
// 2nd editiom
// Chapter 13: RATINGS,SELECTION,AND MAINTENANCE OF ELECTRIC MACHINERY
// Example 13-1
clear; clc; close; // Clear the work space and console.
// Given data
// MOTOR(class A insulation ) is operated for 6 hrs
T = 125 ; // Temperature in degree celsius recorded by the embedded detectors
life_orig = 10 ; // Life in years of the motor (standard)
// Calculations
delta_T = T - 105 ; // Positive temperature difference between the given
// max hottest spot temperature of its insulation and the ambient temperature recorded.
// 105 is chosen from table 13-1(class A insulation)
R = 2 ^ (delta_T/10); // Life reduction factor
Life_calc = life_orig / R ; // Reduced life expectancy of the motor in years
// Display the results
disp("Example 13-1 Solution : ");
printf(" \n Life reduction factor : R = %d \n ",R );
printf(" \n Reduced life expectancy of the motor : Life_calc = %.1f years",Life_calc);
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