diff options
| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /1938/CH3/EX3.21/3_21.sce | |
| download | Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.gz Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.bz2 Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.zip | |
initial commit / add all books
Diffstat (limited to '1938/CH3/EX3.21/3_21.sce')
| -rwxr-xr-x | 1938/CH3/EX3.21/3_21.sce | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/1938/CH3/EX3.21/3_21.sce b/1938/CH3/EX3.21/3_21.sce new file mode 100755 index 000000000..22dfd6934 --- /dev/null +++ b/1938/CH3/EX3.21/3_21.sce @@ -0,0 +1,19 @@ +clc,clear
+printf('Example 3.21\n\n')
+
+V_avg = (220+190)/2 //average voltage across load
+I_avg=12,R_a=0.5,R_sh=250
+W_dash=V_avg*I_avg //power absorbed
+t_1=30,t_2=5
+W=W_dash*(t_2/(t_1-t_2))
+V=250,I=22 //input current
+I_sh = V/R_sh
+I_a= I - I_sh
+arm_cu_loss = R_a*I_a^2 //armature copper loss
+shunt_field_cu_loss = V*I_sh //shunt field copper loss
+total_losses= shunt_field_cu_loss + arm_cu_loss + W
+
+machine_input = V*I
+machine_output = machine_input - total_losses
+eta_m=100*(machine_output /machine_input ) //efficiency when running as motor
+printf('Efficiency of machine when opeating as motor taking current of 22A on 250V supply is \n%.1f percent',eta_m)
|