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+// Calculating the length of air gap

+clc;

+disp('Example 11.11, Page No. = 11.35')

+// Given Data

+// 3 phase silient pole alternator

+kVA = 500;// kVA rating

+V = 3.3;// Voltage rating (in kV)

+f = 50;// Frequency (in Hz)

+rpm = 600;// R.p.m.

+Tph = 180;// Turns per phase

+Bav = 0.54;// Average flux density (in Wb per meter square)

+SCR = 1.2;// Short circuit ratio

+Kw = 0.955;// Winding factor

+Kg = 1.15;// Gap constraction factor

+Kf = 0.65;// Since field form factor is equal to the ratio of pole arc to pole pitch

+// Calculation of the length of air gap

+ns = rpm/60;// Synchronous speed (in r.p.s.)

+p = 2*f/ns;// Number of poles

+Iph = kVA*1000/(3^(1/2)*V*1000);// Armature diameter (in meter)

+ATa = 2.7*Iph*Tph*Kw/p;// Armature mmf per pole (in A)

+AT_f0 = SCR*ATa;// No load field mmf per pole

+Bg = Bav/Kf;// Maximum flux density in air gap (in Wb per meter square)

+lg = 0.8*AT_f0/(800000*Bg*Kg);// Length of air gap

+//  Since mmf required for gap is 80% of no load field mmf

+disp(lg*1000,'Length of air gap (mm)=');

+//in book answer is 5.2 mm.  The answers vary due to round off error