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// Electric Machinery and Transformers
// Irving L kosow
// Prentice Hall of India
// 2nd editiom
// Chapter 4: DC Dynamo Torque Relations-DC Motors
// Example 4-21
clear; clc; close; // Clear the work space and console.
// Given data
S_int = 1603 ; // Internal rated speed in rpm (Ex.4-16)
S_ext = 1250 ; // External rated speed in rpm (Ex.4-16)
hp_int = 14.3 ; // Internal horsepower
hp_ext = 10 ; // External horsepower
// Calculations
T_int = ( hp_int * 5252 ) / S_int ; // Internal torque in lb-ft
T_ext = ( hp_ext * 5252 ) / S_ext ; // External torque in lb-ft
// Display the results
disp("Example 4-21 Solution : ");
printf(" \n a: T_int = %.2f lb-ft \n ", T_int );
printf(" \n b: T_ext = %.2f lb-ft \n ", T_ext );
printf(" \n c: Internal horsepower is developed as a result of electromagnetic");
printf(" \n torque produced by energy conversion. Some of the mechanical energy");
printf(" \n is used internally to overcome mechanical losses of the motor,");
printf(" \n reducing the torque available at its shaft to perform work.");
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