diff options
Diffstat (limited to '2192/CH3/EX3.1/3_1.sce')
| -rwxr-xr-x | 2192/CH3/EX3.1/3_1.sce | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/2192/CH3/EX3.1/3_1.sce b/2192/CH3/EX3.1/3_1.sce new file mode 100755 index 000000000..e2379928a --- /dev/null +++ b/2192/CH3/EX3.1/3_1.sce @@ -0,0 +1,23 @@ +clc,clear +printf('Example 3.1\n\n') + +E=240 +I_a=50 //armature current +R_a=0.1,R_sh=400 //armature and field resistance +N_1=900 ; N_2=1000 //initial and final speed in rpm + +E_b1=E-I_a*R_a //back emf +I_sh1=E/R_sh //shunt field current + +//N (prop.) E_b/phi (prop.) 1/phi; E_b is constant +phi1_by_phi2 = N_2/N_1 +//phi (prop.) I_sh as magnetisation curve is straight line +I_sh1_by_I_sh2=phi1_by_phi2 +I_sh2=I_sh1/ I_sh1_by_I_sh2 + +R = (E/I_sh2)- R_sh //additional resistance in field circuit +printf('Additional resistance in field = %.2f ohms',R) + +//error message +printf('\n\nAnswers do not match because of calculation error') +printf('\nR_sh is wrongly taken as 440 in last step while it is 400 ') |