diff options
Diffstat (limited to '1938/CH3/EX3.14')
| -rwxr-xr-x | 1938/CH3/EX3.14/3_14.sce | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/1938/CH3/EX3.14/3_14.sce b/1938/CH3/EX3.14/3_14.sce new file mode 100755 index 000000000..65fa6c19b --- /dev/null +++ b/1938/CH3/EX3.14/3_14.sce @@ -0,0 +1,20 @@ +clc,clear
+printf('Example 3.14\n\n')
+
+I=5 //no load current
+V=500
+R_sh=250,R_a=0.5 //resistance of shunt field winding and armature
+motor_input_NL = V*I
+I_sh=V/R_sh
+I_a=I-I_sh
+arm_cu_loss_NL = R_a*I_a^2 //no load armature copper loss
+constant_loss = motor_input_NL - arm_cu_loss_NL
+I_FL=50, I_a_FL = I_FL - I_sh //currents at full load
+arm_cu_loss_FL = R_a*I_a_FL^2 //full load armature copper loss
+
+total_loss= constant_loss + arm_cu_loss_FL
+motor_input=V*I_FL
+motor_output_FL= motor_input - total_loss
+printf('Required output power is %.3f kW\n',motor_output_FL/1000)
+eta=100*(motor_output_FL/motor_input) //full load efficiency
+printf('Full load efficiency of motor with 50A current is %.2f percent ',eta)
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