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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);