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[DPRG] Re: Motor stuff
Subject: [DPRG] Re: Motor stuff
From: Dave Hylands
dhylands at gmail.com
Date: Sun Apr 1 22:47:08 CDT 2007
> I am also interested in inputs from others regarding this.
I'll tell a story about motor noise and an MRM board.
I had a Tamiya twin motor gearbox with an MRM mounted about an inch
above it, and there was an LCD attached to the LCD.
Initially, I had a single battery for both.
Whenever the motors ran, the LCD would get gibberish on it and the
processor would eventually crash.
I added optical isolation, which helped a bit, but still gibberish.
Then I added a grounded metal shield (thin sheet of aluminum) between
the motors and the CPU and helped a bit more.
Adding 3 caps to each motor completely eliminated the noise problem.
So the conclusion I came to is that electrical isolation isn't enough.
You have to worry about radiated noise as well, especially if the CPU
is physically near the motors.
--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/
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