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/EX4.46/Ex4_46.sce | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 3760/CH4/EX4.46/Ex4_46.sce

(limited to '3760/CH4/EX4.46/Ex4_46.sce')

diff --git a/3760/CH4/EX4.46/Ex4_46.sce b/3760/CH4/EX4.46/Ex4_46.sce
new file mode 100644
index 000000000..a3934172b
--- /dev/null
+++ b/3760/CH4/EX4.46/Ex4_46.sce
@@ -0,0 +1,12 @@
+clc;
+v=220; // supply voltage 
+n1=2000; // speed of fan motor
+ia1=60; // current corresponding to n=2000 rpm
+// flux is directly proportional to exciting current and load torque increase as square of speed
+// four field coils are connected in two parallel groups also n^2 is directly proportional to armature current therefore
+r=sqrt((2*ia1^2)/n1^2); // ratio of armature current corresponding to n2 and n2 where n2=new speed
+//  counter EMF are directly proportional to product n*ia and ra(armature resistance) and rs(series) resistance are not given, therefore takig ratio of n1*ia1 and n2*ia2 we can determine value of n2
+n2=sqrt((ia1*n1*2)/r);
+printf('New speed is %f rpm\n',n2);
+ia2=n2*r;
+printf('New armature current is %f A\n',ia2); 
-- 
cgit