diff options
Diffstat (limited to '1938/CH2/EX2.9/2_9.sce')
| -rwxr-xr-x | 1938/CH2/EX2.9/2_9.sce | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/1938/CH2/EX2.9/2_9.sce b/1938/CH2/EX2.9/2_9.sce new file mode 100755 index 000000000..3b1fee062 --- /dev/null +++ b/1938/CH2/EX2.9/2_9.sce @@ -0,0 +1,19 @@ +clc,clear
+printf('Example 2.9\n\n')
+
+V=250
+R_a=0.3,R_sh=200 //resistance of armature and shunt field winding
+R_x=150 //additional resistance added in series to field winding
+I_L1=22
+I_sh1=V/R_sh //initial shunt current before adding 150 ohms resistance
+I_a1 = I_L1 - I_sh1 //initial armature current before adding 150 ohms resistance
+N_1=1500 //initial speed before adding 150 ohms resistance
+//T (prop.) phi*I_a (prop.) I_sh*I_a and T_1=T_2 and simplifying further
+I_sh2=V/(R_sh + R_x) //new shunt current
+I_a2= I_sh1*I_a1/I_sh2 //New armature current
+
+E_b1=V - I_a1*R_a //induced emf before adding 150 ohms resistance
+E_b2=V - I_a2*R_a //new emf
+
+N_2 = N_1 * (E_b2/E_b1) * (I_sh1/I_sh2) //new speed
+printf('New armature current and speed are %.4f A and %.2f r.p.m respectively',I_a2,N_2)
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