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// FUNDAMENTALS OF ELECTICAL MACHINES
// M.A.SALAM
// NAROSA PUBLISHING HOUSE
// SECOND EDITION
// Chapter 11 : SINGLE-PHASE MOTORS
// Example : 11.3
clc;clear; // clears the console and command history
// Given data
V_t = 220 // supply voltage in V
f = 50 // frequency in Hz
Z_m = 3+%i*5 // main winding impedance of motor in ohm
Z_s = 5+%i*3 // starting impedance of motor in ohm
// caclulations
alpha_s = atand(imag(Z_s),real(Z_s)) // angle in degree from Z_s
I_s = V_t/Z_s // starting current in A
alpha_m = atand(imag(Z_m),real(Z_m)) // angle in degree from Z_m
I_m = V_t/(Z_m) // main winding current in A
alpha = alpha_m-alpha_s // angle of line current
I = sqrt((abs(I_s))^2+(abs(I_m))^2+2*abs(I_s)*abs(I_m)*cosd(alpha)) // line current in A
// display the result
disp("Example 11.3 solution");
printf(" \n Input current \n I_s = %.2f<%.2f A \n", abs(I_s),atand(imag(I_s),real(I_s)) );
printf(" \n Main winding current \n I_m = %.2f<%.f A \n", abs(I_m),atand(imag(I_m),real(I_m)));
printf(" \n Line current \n I = %.2f A \n", I );
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