diff options
Diffstat (limited to '1938/CH2/EX2.11/2_11.sce')
| -rwxr-xr-x | 1938/CH2/EX2.11/2_11.sce | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/1938/CH2/EX2.11/2_11.sce b/1938/CH2/EX2.11/2_11.sce new file mode 100755 index 000000000..a88a7620c --- /dev/null +++ b/1938/CH2/EX2.11/2_11.sce @@ -0,0 +1,15 @@ +clc,clear
+printf('Example 2.11\n\n')
+
+V=220
+I_1=50, I_a1=I_1 //Currents before adding extra resistance
+T_2_by_T_1 =0.5
+R_t=0.15 //R_e + R_se =0.15
+
+I_a2 =I_a1 * sqrt(T_2_by_T_1) //Because T (prop.) I_a^2
+E_b1=V-I_a1*(R_t) //induced emf before adding extra resistance
+N_1=500,N_2=300 //speeds before and adding extra resistance
+//N (prop.) E_b/phi (prop.) E_b/I_a
+E_b2=E_b1 *(I_a2/I_a1)*(N_2/N_1) //induced emf after adding resistance
+R_x= (V-E_b2)/I_a2 -R_t //because E_b2=V - I_a2*(R_a + R_se + R_x)
+printf('Desired extrea resistance= %.4f ohms ',R_x)
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