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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /380/CH5/EX5.6/Ex5_6.sce | |
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initial commit / add all books
Diffstat (limited to '380/CH5/EX5.6/Ex5_6.sce')
| -rwxr-xr-x | 380/CH5/EX5.6/Ex5_6.sce | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/380/CH5/EX5.6/Ex5_6.sce b/380/CH5/EX5.6/Ex5_6.sce new file mode 100755 index 000000000..d5b3097e6 --- /dev/null +++ b/380/CH5/EX5.6/Ex5_6.sce @@ -0,0 +1,45 @@ +//Caption:Find R_fx and (a)terminal voltage (b) voltage regulation (c) Efficiency
+//Exa:5.6
+clc;
+clear;
+close;
+R_fw=30;//in ohms
+R_a=0.2;//in ohms
+N_f=200;//turns/pole
+P_r=1200;//in Watts
+I_L=100;
+D_mmf=0.5*I_L;//demagnetizing mmf
+V_nL=170;//no load voltage (in Volts)
+//Refer to fig:5.26 (magnetization curve)
+I_f=3.5;//field current in Amperes
+R_f=V_nL/I_f;
+R_fx=R_f-R_fw;
+disp(R_fx,'R_fx (in ohms)=');
+//First iteration:
+//Assume
+E_a=170;
+V_t1=E_a-103.5*R_a;
+//Second iteration:
+I_f2=V_t1/R_f;//actual field current
+I_fe2=(N_f*I_f2-D_mmf)/N_f;
+//Refer to fig:5.26
+E_a2=165;
+V_t2=E_a2-103.07*R_a;
+//third iteration
+I_f3=V_t2/R_f;//actual field current
+I_fe=(N_f*I_f-D_mmf)/N_f;
+//Refer to fig:
+E_a3=163;
+V_t3=E_a3-102.97*R_a;
+V_t=V_t3;
+disp(V_t,'(a) Terminal voltage (in Volts)=');
+I_f=V_t/R_f;
+E_a=E_a3;
+VR=(V_nL-V_t)*100/V_t;
+disp(VR,'(b) Voltage Regulation (%)=');
+P_o=V_t*I_L;//power output
+P_cu=R_a*(I_L+I_f)^2+R_f*I_f^2;//copper loss
+P_d=P_o+P_cu;//power developed
+P_in=P_d+P_r;//power input
+Eff=P_o*100/P_in;
+disp(Eff,'(c) Efficiency (%)=');
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