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From: jshapiro@mcs213a.cs.umr.edu (Jeff Shapiro)
Newsgroups: comp.robotics
Subject: Re: Small motor amps
Message-ID: <2427@umriscc.isc.umr.edu>
Date: 18 Mar 91 22:51:27 GMT
References: <1991Mar18.193938.14805@cs.cmu.edu>
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Organization: University of Missouri - Rolla
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>I'm looking for a source of bare motor amplifiers. Nothing fancy, just
>something that will switch its output between ground and +24VDC at 10-15 amps
>(float would be nice, too). PWM will be produced up stream. I'd rather provide
>my own heat sinking. I don't think such a thing should be too complicated, but
>our home brew attempt (with a push/pull FET pair and some compensation for the
>slower P-channel device) suffers a bad case of ringing induced, i believe, by
>back EMF from the motor. Any pointers (or even your favorite design) would be
>greatly appreciated!

You might try a powerful audio amplifier.  I know a person who used one for a
superconducting motor and it worked pretty well.  I don't know if it could
float though :).  

Jeff Shapiro
r103336@apollo.physics.umr.edu
jshapiro@cs.umr.edu