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// FUNDAMENTALS OF ELECTICAL MACHINES
// M.A.SALAM
// NAROSA PUBLISHING HOUSE
// SECOND EDITION
// Chapter 6 : CONTROL AND STARTING OF A DC MOTORS
// Example : 6.1
clc;clear; // clears the console and command history
// Given data
V_t = 220 // supply voltage in V
I_a1 = 10 // dc shunt motor armature current in A
N_1 = 900 // speed in rpm
R_a = 1 // armature resistance in ohm
N_2 = 500 // speed in rpm
// caclulations
E_b1 = V_t-I_a1*R_a // initial back emf in V
R = (E_b1/10)*(1-(N_2/N_1)) // additional value of resistance in ohm
// display the result
disp("Example 6.1 solution");
printf(" \n additional value of resistance \n R = %.1f ohm \n", R);
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