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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 02:11:54 CST 2008
OK, Chuck,
I think I am getting clued in.
So really more than IR drops due to loads we are talking inductive drops or
increases of voltage V=Ldi/dt depending on increasing or decreasing current.
So for an instant, when relay opens and current in motor circuit decreases
very rapidly , Scott's ground lead looks like a battery supplying at least a
few volts to the ground wire -- got it.
If per chance it supplied 5 volts, the voltage supply might drop to zero --
assuming no capacitance at processor.
This brings up a question. Could a reasonable capacitor say 10 uF tied to
processor (or real close) protect processor from the bounce?
Ron
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http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489
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