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Diffstat (limited to '3681/CH9/EX9.9/Ex9_9.sce')
| -rw-r--r-- | 3681/CH9/EX9.9/Ex9_9.sce | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/3681/CH9/EX9.9/Ex9_9.sce b/3681/CH9/EX9.9/Ex9_9.sce new file mode 100644 index 000000000..1a58ea40f --- /dev/null +++ b/3681/CH9/EX9.9/Ex9_9.sce @@ -0,0 +1,26 @@ +// Calculating the number of extra shunt field turns to neutralize the demagnetization
+clc;
+disp('Example 9.9, Page No. = 9.38')
+// Given Data
+p = 4;// Number of poles
+Is = 140;// Current supplied by generator (in ampere)
+Z = 480;// Number of armature conductors
+mech_degree = 10;// Since brushes are given an actual lead of 10 degree
+// Calculation of the extra shunt field turns to neutralize the demagnetization
+Ia = Is+10;// Armature current (A). Since field winding is shunt connected and takes a current of 10 ampere
+alpha = p/2*mech_degree;// Angle of lead (in electrical degree)
+disp('(a) Wave connected')
+a= 2 // With wave winding number of parallel paths
+ATa = Ia*Z/(a*2*p);// Armature mmf per pole (A)
+ATad = ATa*2*alpha/180;;// Demagnetizing mmf per pole (A)
+ATaq = ATa-ATad;// Cross magnetizing mmf per pole (A)
+Extra_turns = ATad/10;// Extra turns required on the shunt field. Since field winding is shunt connected and takes a current of 10 ampere
+disp(Extra_turns,'Extra turns required on the shunt field =');
+disp('(b) Lap connected')
+a= p // With lap winding number of parallel paths
+ATa = Ia*Z/(a*2*p);// Armature mmf per pole (A)
+ATad = ATa*2*alpha/180;;// Demagnetizing mmf per pole (A)
+ATaq = ATa-ATad;// Cross magnetizing mmf per pole (A)
+Extra_turns = ATad/10;// Extra turns required on the shunt field. Since field winding is shunt connected and takes a current of 10 ampere
+disp(Extra_turns,'Extra turns required on the shunt field =');
+//in book answers are 100 and 50 respectively. The answers vary due to round off error
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