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[DPRG] Motor backlash / Back EMF
Subject: [DPRG] Motor backlash / Back EMF
From: DeltaGraph at aol.com
DeltaGraph at aol.com
Date: Mon Jan 7 18:24:14 CST 2008
Thanks Chuck, Jon and Triffid for all the input.
Makes me think would be useful to exaggerate resistances and inductances in
a sample circuit OR to use a simulation to show what is going on.
A cool, free tool I have played with in the past is LTspice/SwitcherCAD from
Linear Technology
_http://www.linear.com/designtools/software/switchercad.jsp_
(http://www.linear.com/designtools/software/switchercad.jsp)
provides an easy to use schematic capture program combined with circuit
simulator -- e.g. virtual oscilloscopes... need to re-learn that tool.
One problem I still have, is Scott's car uses one battery for processor and
one for motor.
When motor turns on-and-off current changes in motor supply loop, but not in
processor loop,
so my last email was flawed there in talking about his processor loop
reacting to motor current dropping to zero when relay opened and adding inductive
energy to processor ground.
I have noticed the need for processor decoupling on even the smallest AVR
microcontrollers, e.g. Tiny13 running unloaded using internal RC oscillator on
a breadboard did not work. Of course we are talking 6 inches + of wire runs
from 4 AA batteries in series.
Ron
**************Start the year off right. Easy ways to stay in shape.
http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489
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