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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 1938/CH3/EX3.31/3_31.sce |  33 +++++++++++++++++++++++++++++++++
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+clc,clear
+printf('Example 3.31\n\n')
+
+I_1=56  //motor input current
+V=590   //voltage across armature
+I_2=44  // load current
+V_2=400 // voltage across generator
+V_field = 40  //voltage drop across field winding
+R_a=0.3, R_se=0.7142 //armature and series field resistance for each machine
+total_input=(V+V_field)*I_1
+output=V_2*I_2
+total_loss_g_m= total_input - output   //total losses of 2 machines
+R_se=V_field/I_1  //series field resistance for both windings
+total_cu_loss = (R_a+ 2*R_se)*I_1^2  + R_a*I_2^2  //total copper loss
+stray_loss= total_loss_g_m - total_cu_loss
+stray_loss_each = stray_loss/2  //stray loss for each machine
+
+// for motor
+motor_input = V*I_1
+arm_cu_loss_m =  (R_a+ R_se)*I_1^2    //armature coper losses of motor
+total_loss_m= arm_cu_loss_m + stray_loss_each
+motor_output = motor_input - total_loss_m
+eta_m = 100*(motor_output/motor_input)//motor efficiency 
+printf('Efficiency of motor is %.4f percent\n',eta_m)
+
+// for generator
+arm_cu_loss_g = R_a*I_2^2  //armature coper losses of generator
+series_field_cu_loss_g = V_field*I_1   //series field copper loss
+total_loss_g= arm_cu_loss_g + series_field_cu_loss_g + stray_loss_each
+generator_output=V_2*I_2
+generator_input = generator_output +  total_loss_g
+eta_g = 100*(generator_output/generator_input)//generator efficiency 
+printf('Efficiency of generator is %.4f percent\n',eta_g)
-- 
cgit