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+// Estimating the average flux density in the air gap

+clc;

+disp('Example 3.4, Page No. = 3.14')

+// Given Data

+MVA = 172;// MVA rating

+P = 20;// Number of pole

+D = 6.5;// Diameter in meter

+L = 1.72;// Core length in meter

+ys = 64;//Slot Pitch in mm

+Ws = 22;// Stator slot (open) width in mm

+lg = 30;// Length of air gap in mm

+nd = 41;// Number of ventilating ducts

+Wd = 6;// Width of each ventilating Duct in mm

+mmf = 27000// Total mmf per pole in A

+Kf = 0.7;// Field form factor

+// Estimation of effective air gap area per pole

+y=Ws/(2*lg);//Ratio for slots

+Kcs= (2/%pi)*(atan(y)-log10(sqrt(1+y^2))/y);//Carter's co-efficient for slots

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

+y=Wd/(2*lg);//Ratio for ducts

+Kcd= (2/%pi)*(atan(y)-log10(sqrt(1+y^2))/y);//Carter's co-efficient for slots

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

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

+ATg = 0.87*mmf;// The required for the air gap is 87% of the total mmf per pole in A

+Bg = ATg/(800000*Kg*lg*10^(-3));// Maximum flux density in air gap in Wb per meter square

+Bav= Kf*Bg;// Average flux density in air gap in Wb per meter square

+disp(Bav,'Average flux density in air gap (Wb per meter square)=');

+//in book answer is .615 Wb per meter square.  The provided in the textbook is wrong