Subject:
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RE: motor voltages
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 15 Apr 1996 17:00:44 GMT
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Original-From:
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Chuck McManis <cmcmanis@netcom.com*StopSpammers*>
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Viewed:
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2049 times
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The most efficient way to do this is to use a "step down" regulator. These small
switching regulators can efficiently lower the voltage while maintaining the
current requirements. Maxim sell several chips that do this however you will
be limited to the adjustable ones since 6v is not a 'standard' voltage (lots of
choices in the 3.3v and 5v range :-)) The simplest way to do this is to put
a couple (3) diodes in series between the v+ and the motor. If you use
3 watt silicon rectifiers you can often get them to drop the voltage by
1.2volts when forward biased. Three would drop the voltage 3.6 volts. The
down side is that they will dissipate Vdrop*A watts in heat so a 3A motor
and a 1.2v drop will get you 3.6 watts of heat output. Good for toast, not
so good for battery life. Finally, you can convert the DC voltage into an
AC voltage, use a transformer to change its voltage fairly efficiently (not
as efficiently as the step down regulator, but better than the diodes) and
then you will need to rectifiy it again with a full wave bridge rectifier.
--Chuck
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From: Jeff Keyzer[SMTP:jkeyzer@calweb.com]
Sent: Saturday, April 13, 1996 9:10 AM
To: handyboard@media.mit.edu
Subject: motor voltages
Along similar lines, anyone know of a nice way to regulate 9.6V down
to 6 or so, at 2 or 3 amps peak? I'm looking for something that's
efficient, and won't try to burn itself out during normal use. Possibly
something like the LM317 is available in a high current version? What about
DC-DC converters? Do they work at anything over a few tens of mA? Maybe
some of the electronics buffs around here are familiar with this...
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