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Diffstat (limited to '3681/CH3/EX3.3/Ex3_3.sce')
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diff --git a/3681/CH3/EX3.3/Ex3_3.sce b/3681/CH3/EX3.3/Ex3_3.sce new file mode 100644 index 000000000..0461e961a --- /dev/null +++ b/3681/CH3/EX3.3/Ex3_3.sce @@ -0,0 +1,29 @@ +// Estimating the effective air gap area per pole
+clc;
+disp('Example 3.3, Page No. = 3.13')
+// Given Data
+P = 10;// Number of pole
+Sb = 0.65;// Stator bore in meter
+L = 0.25;// Core length in meter
+Nss = 90;// Number of stator slots
+Wos = 3;// Stator slot opening in mm
+Nrs = 120;// Number of rotor slots
+Wor = 3;// Rotor slot opening in mm
+lg = 0.95;// Length of air gap in mm
+Kcs = 0.46;//Carter's co-efficient for slots
+Kcd = 0.68;//Carter's co-efficient for ducts
+nd = 3;// Number of ventilating ducts
+Wd = 10;// Width of each ventilating Duct in mm
+// Estimation of effective air gap area per pole
+ys = 3.141592654*Sb*10^(3)/Nss;// Stator slot pitch
+Kgss=ys/(ys-(Kcs*Wos));//Gap contraction factor for stator slots
+Rd = Sb-2*lg*10^(-3);// Rotor diameter in meter
+yr = 3.141592654*Rd*10^(3)/Nrs;// Rotor slot pitch
+Kgsr=yr/(yr-(Kcs*Wor));//Gap contraction factor for rotor slots
+Kgs=Kgss*Kgsr;//Gap contraction factor for slots
+Kgd=L*10^(3)/(L*10^(3)-(Kcd*nd*Wd));//Gap contraction for ducts
+Kg=Kgs*Kgd;//Total gap contracion factor
+Ag = 3.141592654*Sb*L/P;// Actual area of air gap per pole in meter square
+Age = Ag/Kg;// Effective air gap area per pole in meter square
+disp(Age,'Effective air gap area per pole(meter square)=');
+//in book answer is .04052 A. The answers vary due to round off error
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