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+// Calculating the mmf required for the air gap of a machine

+clc;

+disp('Example 3.2, Page No. = 3.12')

+// Given Data

+L = 0.32;// Core length in meter

+nd = 4;// Number of ducts

+Wd = 10;// Duct width in mm

+Pa = 0.19;// Pole arc in meter

+ys=65.4;//Slot Pitch in mm

+lg = 5;// Length of air gap in mm

+Wo = 5;// Slot opening in mm

+Fpp = 52;// Flux per pole in mWb

+Kcs = 0.18;//Carter's co-efficient for slots

+Kcd = 0.28;//Carter's co-efficient for ducts

+// Calculation of mmf required for the air gap

+Kgs=ys/(ys-(Kcs*Wo));//Gap contraction for slots

+Kgd=L/(L-(Kcd*nd*Wd*10^(-3)));//Gap contraction for ducts

+Kg=Kgs*Kgd;//Total gap contracion factor

+Bg=Fpp*10^(-3)/(Pa*L);//Flux density at the centre of pole in Wb per meter square

+ATg=800000*Kg*Bg*lg*10^(-3);//mmf required for air gap in A

+disp(ATg,'mmf required for air gap(A)=');

+//in book answer is 3587 A.  The answers vary due to round off error