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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 13-6

+

+clear; clc; close; // Clear the work space and console.

+

+// Given data

+P_o = 55 ; // Power rating of the WRIM in hp

+T_ambient = 40 ; // Standard ambient temperature recorded by the embedded 

+// hot-spot detectors in degree celsius

+life_orig = 10 ; // Life in years of the motor (standard)

+

+// Calculated data from Ex.13-5b

+T_f = 172 ; // Approximate final hot-spot temperature in degree celsius

+

+// Calculations

+delta_T = T_f - 155 ; // Positive temperature difference betw the given

+// max hottest spot temperature of its insulation and the ambient temperature recorded.

+// 155 is chosen from table 13-1(class F 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 13-6 Solution : ");

+printf(" \n From Ex.13-5b,T_f = %d degree celsius\n",T_f);

+printf(" \n Life reduction factor : R = %.2f \n  ",R );

+printf(" \n Reduced life expectancy of the motor : Life_calc = %.2f years",Life_calc);