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/CH5/EX5.8/Ex5_8.sce | 40 ++++++++++++++++++++++++++++++++++++++++
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+// FUNDAMENTALS OF ELECTICAL MACHINES 
+// M.A.SALAM 
+// NAROSA PUBLISHING HOUSE 
+// SECOND EDITION
+
+// Chapter 5 : DIRECT CURRENT MOTORS
+// Example : 5.8
+
+clc;clear; // clears the console and command history 
+
+// Given data
+I_L1 = 5     // dc shunt motor current in A
+V_t = 230    // supply voltage in V
+R_a = 0.25   // armature resistance in ohm
+R_sh = 115   // field resistance in ohm
+I_L2 = 40    // dc shunt motor current in A
+
+
+// caclulations 
+// at noload condition
+P_in1 = V_t*I_L1                        // input power in W
+I_sh = V_t/R_sh                         // shunt field current in A
+I_a1 = I_L1-I_sh                        // armature current in A
+P_acu1 = I_a1^2*R_a                     // armature copper loss in W
+P_shcu = I_sh^2*R_sh                    //shunt field copper loss in W
+P_iron_friction = P_in1-(P_acu1+P_shcu) // iron and friction losses in W
+// under load condition
+I_a2 = I_L2-I_sh                        // armature current in A
+P_acu2 = I_a2^2*R_a                     // armature copper loss in W
+P_loss = P_iron_friction+P_shcu+P_acu2  // total losses in W
+P_in2 = V_t*I_L2                        // input power in W
+P_0 = P_in2-P_loss                      // output power in W
+n = (P_0/P_in2)*100                     // efficiency in percent
+
+// display the result 
+disp("Example 5.8 solution");
+printf(" \n iron and friction losses \n P_iron_friction = %.2f W \n", P_iron_friction );
+printf(" \n efficiency \n n = %.0f percent \n", n)
+
+
-- 
cgit