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// FUNDAMENTALS OF ELECTICAL MACHINES
// M.A.SALAM
// NAROSA PUBLISHING HOUSE
// SECOND EDITION
// Chapter 2 : BESICS OF MAGNETIC CIRCUITS
// Example : 2.7
clc;clear; // clears the console and command history
// Given data
l = 0.1 // length in m
w = 0.01 // width in m
h =0.1 // height in m
N = 450 // number of turns
I = 0.2 // current in A
myu_r = 850 // relative permiability magnetic material
// caclulations
MMF = N*I // magnetomotive force in At
l_c = (h-w)*4 // mean length of the path in m
A = w*w // cross sectional area in m^2
R_m = l_c/(4*%pi*10^-7*myu_r*A) // relectance in At/Wb
flux = MMF/R_m // flux in Wb
B = flux/A // magnetic flux density in Wb/m^2
H = B/(4*%pi*10^-7*myu_r) // field intensity in At/m
// display the result
disp("Example 2.7 solution");
printf(" \n Flux \n flux= %.2e Wb \n", flux);
printf(" \n Magnetic flux density \n B= %.4f Wb/m^2 \n", B);
printf(" \n Field intensity \n H= %.2f At/m \n", H);
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