initial commit / add all books

1 files changed, 32 insertions, 0 deletions

diff --git a/3760/CH4/EX4.30/Ex4_30.sce b/3760/CH4/EX4.30/Ex4_30.sce
new file mode 100644
index 000000000..c9600bb48
--- /dev/null
+++ b/3760/CH4/EX4.30/Ex4_30.sce
@@ -0,0 +1,32 @@
+clc;

+//Armature reaction is neglected.

+Vt=250;//Supply voltage

+P=4;//No of poles

+A=2;//No of parallel paths for armature conductors

+Z=500;//No of armature conductors

+Ra=0.25;//armature circuit resistance in ohm

+Rf=125;//field resistance in ohm

+phi=0.02;//flux per pole in weber

+Il=14;//current drawn by motor from supply mains

+Ish=Vt/Rf;//constant shunt field current

+Pr=300;//rotational losses in watts

+Pi=Vt*Il;//power input in watts

+

+//PART(a)-

+Ia=Il-Ish;//armature current

+Ea=Vt-Ia*Ra;//counter/back emf

+//Ea=(P*phi*Z*N)/(60*A)

+N=(60*A*Ea)/(P*phi*Z);//speed of rotation of motor in rpm

+Wm=(2*%pi*N)/60;//angular velocity of motor

+Pe=Ea*Ia;//electromagnetic power

+Ti=Pe/Wm;//Internal torque developed in Nm.

+printf('Speed of rotation of motor is %f rpm.',N);

+printf('\nInternal torque developed = %f Nm.',Ti);

+

+//PART(b)-

+Psh=Pe-Pr;//shaft power

+Tsh=Psh/Wm;//shaft torque

+%n=(Psh/Pi)*100;//percentage eficiency

+printf('\nShaft power = %f watts.',Psh);

+printf('\nShaft torque = %f Nm.',Tsh);

+printf('\nEfficiency of motor is %f percent.',%n);