From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001
From: prashantsinalkar
Date: Tue, 10 Oct 2017 12:27:19 +0530
Subject: initial commit / add all books

---
 3574/CH11/EX11.7/EX11_7.sce | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 3574/CH11/EX11.7/EX11_7.sce

(limited to '3574/CH11/EX11.7/EX11_7.sce')

diff --git a/3574/CH11/EX11.7/EX11_7.sce b/3574/CH11/EX11.7/EX11_7.sce
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+// 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);
-- 
cgit