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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 13-2

+

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

+

+// Given data

+// MOTOR(class A insulation ) is operated for 6 hrs

+T = 75 ; // Temperature in degree celsius recorded by the embedded detectors

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

+

+// Calculations

+delta_T = 105 - T ; // 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)

+E = 2 ^ (delta_T/10); // Life extension factor

+  

+Life_calc = life_orig * E ; // Increased life expectancy of the motor in years

+

+// Display the results

+disp("Example 13-2 Solution : ");

+printf(" \n Life extension factor : E = %d \n ",E );

+printf(" \n Increased life expectancy of the motor : Life_calc = %d years ",Life_calc);