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Diffstat (limited to '3574/CH10/EX10.4')
| -rw-r--r-- | 3574/CH10/EX10.4/EX10_4.png | bin | 0 -> 113855 bytes | |||
| -rw-r--r-- | 3574/CH10/EX10.4/EX10_4.sce | 34 |
2 files changed, 34 insertions, 0 deletions
diff --git a/3574/CH10/EX10.4/EX10_4.png b/3574/CH10/EX10.4/EX10_4.png Binary files differnew file mode 100644 index 000000000..3e3a6011a --- /dev/null +++ b/3574/CH10/EX10.4/EX10_4.png diff --git a/3574/CH10/EX10.4/EX10_4.sce b/3574/CH10/EX10.4/EX10_4.sce new file mode 100644 index 000000000..6156c6d4a --- /dev/null +++ b/3574/CH10/EX10.4/EX10_4.sce @@ -0,0 +1,34 @@ +// Example 10.4
+// Computation of percentage reduction in field flux required to obtain a
+// speed of 1650 r/min while drawing an armature current of 50.4 A.
+// Page No. 405
+
+clc;
+clear;
+close;
+
+// Given data
+VT=240; // Induced emf
+R=95.2; // Shunt field resistance
+IT=72; // Total current
+Ra=0.242; // Armature resistance
+Ia2=50.4; // Armature current
+n1=850; // Rated speed of shunt motor
+n2=1650; // Speed of armature winding
+
+
+// Percentage reduction in field flux
+
+If1=VT/R; // Field current
+Ia1=IT-If1; // Armature current
+Ea1=VT-Ia1*Ra; // Armature emf
+Ea2=VT-Ia2*Ra;
+phip2=(n1/n2)*(Ea2/Ea1);
+PerRed=(phip2-1)*100;
+
+
+
+// Display result on command window
+printf("\n Percentage reduction in field flux = %0.1f Percent ",PerRed);
+
+
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