From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001 From: prashantsinalkar Date: Tue, 10 Oct 2017 12:27:19 +0530 Subject: initial commit / add all books --- 3760/CH4/EX4.30/Ex4_30.sce | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 3760/CH4/EX4.30/Ex4_30.sce (limited to '3760/CH4/EX4.30') 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); -- cgit