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

---
 3811/CH11/EX11.4/Ex11_4.sce | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 3811/CH11/EX11.4/Ex11_4.sce

(limited to '3811/CH11/EX11.4/Ex11_4.sce')

diff --git a/3811/CH11/EX11.4/Ex11_4.sce b/3811/CH11/EX11.4/Ex11_4.sce
new file mode 100644
index 000000000..1cdf12506
--- /dev/null
+++ b/3811/CH11/EX11.4/Ex11_4.sce
@@ -0,0 +1,18 @@
+//Book Name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 11
+//example 11.4
+//edition 1
+//publishing place:Thomson Learning
+clc;
+clear;
+Ra=1;//armature resistance in ohm
+Kphi=3;//field constant in V sec
+Vt=500;//terminal voltage in volt
+Vf=600;//increased motor voltage in volt
+Td=20;//constant torque of thmotor in Nm
+J=6;//total moment of inertia of the drive in Nm
+omega0=(Vt/Kphi)-((Ra*Td)/Kphi^(2));//initial speed in rad/sec
+omegaf=(Vf/Kphi)-((Ra*Td)/Kphi^(2));//final speed in rad/sec
+tau=(J*Ra)/Kphi^(2);
+t=-(tau*log((0.05*omegaf)/(omegaf-omega0)));//obtained from the equation of omega=omega(f)(1-e^-t/tau)+omega(0)e^-t/tau
+mprintf("The time required to change the motor speed is %f sec",t)
-- 
cgit