From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

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 2642/CH4/EX4.7/Ex4_7.sce | 34 ++++++++++++++++++++++++++++++++++
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+// FUNDAMENTALS OF ELECTICAL MACHINES 
+// M.A.SALAM 
+// NAROSA PUBLISHING HOUSE 
+// SECOND EDITION
+
+// Chapter 4 : DIRECT CURRENT GENERATORS
+// Example : 4.7
+
+
+clc;clear; // clears the console and command history 
+
+// Given data
+E = 25 // power of compound generator in kW
+V_t = 220 // terminal voltage in V
+R_se = 0.05    // series resistance in ohm
+R_sh = 55    // shunt field resistance in ohm
+R_a = 0.07   // armature resistance in ohm
+brush_drop = 1 // voltage drop per brush in V
+
+// caclulations 
+I_L = E*10^3/V_t // load current in A
+I_sh1 = V_t/R_sh // shunt field current in A
+I_a1 = I_sh1+I_L // armature current in A
+E_g1 = V_t+I_a1*(R_a+R_se)+2*brush_drop // generator voltage in V
+V_ab = V_t+I_L*R_se // voltage across the shunt field in V for short shunt generator
+I_sh2 = V_ab/R_sh // current in the shunt field in A for short shunt generator
+I_a2 = I_sh2+I_L // armature current in A for short shunt generator
+E_g2 = V_ab+I_a2*R_a+2*brush_drop // generator voltage in V for short shunt generator
+
+// display the result 
+disp("Example 4.7 solution");
+printf(" \n Generated emf when generatar is connected in long shunt \n E_g1 = %.f V \n", E_g1);
+printf(" \n Generated emf when generatar is connected in short shunt \n E_g2 = %.1f V \n", E_g2);
+
-- 
cgit