Subject:
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Re: Increasing current output to motors on HandyBoard
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 10 Apr 1999 00:46:59 GMT
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Original-From:
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Gary Livick <GLIVICK@PACBELL.NETsaynotospam>
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Viewed:
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3497 times
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Howdy,
My original suggestion was to use *solid state* relays. They don't have any
contacts. I use them plugged right into my Rug Warrior board at the motor output
ports (would work the same on my Handy Board, but I have it on a smaller base, and
the L293D is big enough for that). The relays switch very fast, being solid state.
They are rated at 6 amps at 36 volts, and were $7 each. Smaller ones are less
expensive, but their main advantage is ease of use.
Gary Livick
K.L.McKinnon wrote:
> Haven't actually tried it, but I was thinking of the same sort of thing.
> Use a FET for PWM and a DPDT relay for direction. practically speaking,
> if you only switched the relay when the FET was off, no power
> transition, etc....
> If your 'bot moves forward more than back than using a default state
> (N/C) for the forward motion, means current to the relay is only
> consummed during the reverse movement.
> A single FET with a relay s(w)hould prove to be quite a bit more space
> conservative and likely cost effective as well.
> Comments?
>
> K.L. McKinnon
>
> MAR ERICSON wrote:
> >
> > I wonder if this would last since a relay is mechanical and I would
> > assume that it would wear with all that "switching". Doe anyone have any
> > experience with this?
> >
> > Thanks.
> >
> > -----------
> > ericson mar
> > Robotics Consultant
> > mar@cooper.edu
> > (212)353-4356
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