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| author | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
|---|---|---|
| committer | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
| commit | 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 (patch) | |
| tree | dbb9e3ddb5fc829e7c5c7e6be99b2c4ba356132c /3574/CH11/EX11.7/EX11_7.sce | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
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initial commit / add all books
Diffstat (limited to '3574/CH11/EX11.7/EX11_7.sce')
| -rw-r--r-- | 3574/CH11/EX11.7/EX11_7.sce | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/3574/CH11/EX11.7/EX11_7.sce b/3574/CH11/EX11.7/EX11_7.sce new file mode 100644 index 000000000..538ac73a9 --- /dev/null +++ b/3574/CH11/EX11.7/EX11_7.sce @@ -0,0 +1,34 @@ +// Example 11.7
+// Computation of the resistance of a dynamic braking resistor that will be
+// capable of developing 500 lb-ft of braking torque at a speed of 1000 r/min.
+// Page No. 464
+
+clc;
+clear;
+close;
+
+// Given data
+T1=910; // Torque load
+Pshaft=199.257*746; // Power of shaft
+eeta=0.940; // Efficiency
+VT=240; // Rated voltage
+T2=500; // Braking torque
+n1=1000; // Windage and friction speed
+n2=1150; // Speed of motor
+Rf=52.6; // Field resistance
+Racir=0.00707; // Combined armature,compensating winding and // interpolar resistance
+
+// Resistance of a dynamic braking resistor
+Pshaft=T1*n2/5252; // Shaft power
+Pin=Pshaft*746/eeta; // Input power
+IT=Pin/VT; // Total current
+If=VT/Rf; // Field current
+Ia1=IT-If; // Armature current
+Ea1=VT-Ia1*Racir; // Armature emf
+
+Ia2=Ia1*T2/T1; // Armature current
+Ea2=Ea1*n1/n2;
+RDB=(Ea2-Ia2*Racir)/Ia2; // Resistance
+
+//Display result on command window
+printf("\n Resistance of the dynamic braking resistor = %0.3f Ohm ",RDB);
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