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+// FUNDAMENTALS OF ELECTICAL MACHINES 

+// M.A.SALAM 

+// NAROSA PUBLISHING HOUSE 

+// SECOND EDITION

+

+// Chapter 2 : BESICS OF MAGNETIC CIRCUITS 

+// Example : 2.8

+

+clc;clear; // clears the console and command history 

+

+// Given data

+N = 450       // number of turns wound on left side of limb

+A = 4         // cross sectional area in m^2

+I = 5        // current through coil in A

+fulx = 3     // flux in right limb Wb

+myu_r = 500  // relative permiability magnetic material

+l_1 = 0.12

+l_2 = 0.24

+phi2 = 3

+

+// caclulations 

+// we have relation 

+// phi1*rm1 = phi2*rm2 

+// phi1*l_1/uA = pi2*l_2/uA

+phi1 = phi2*l_2/l_1           // flux on left side in Wb

+flux = phi1+phi2              // total flux in Wb

+B_1 = flux/A                  // flux density in the left limb

+H_1 = B_1/(4*%pi*10^-7*myu_r) // magnetic flux in At/m

+MMF_1 = H_1*l_2               // magnetomotive force in At

+B_2 = phi2/A                  // flux density in the right limb

+H_2 = B_2/(4*%pi*10^-7*myu_r) // magnetic flux in At/m

+MMF_2 = H_2*l_2               // magnetomotive force in At

+MMF_t = MMF_1+MMF_2           // total magnetomotive force in At

+I = MMF_t/N                   // current in A

+

+// display the result 

+disp("Example 2.8 solution");

+printf(" \n Current\n I= %.2f A \n", I);