Subject:
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Re: More juice
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 14 Aug 1997 16:11:01 GMT
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Original-From:
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MAR ERICSON <mar@cooper.eduIHATESPAM>
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Viewed:
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1283 times
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This subject was discussed some time ago. The discussion yeilded the
following:
When you put two batteries in parrallel on paper, the voltage is exactly
the same. In real life, the two bateries will have slightly different
voltages and one will discharge and the other will charge. Since
NiCd's have a very low internal resistance. There's a chance that there
will be alot of current involved and therefore, you may waste alot of
battery life by just having them connected in parralel. Get a large pack
or use higher energy density bateries if you want the extra life. But you
may have to sacrifice the built in charging capabilities.
-----------
ericson mar
Master of Engineering Candidate
Project: Mobile Robotics
mar@cooper.edu
(212)353-4356
Department of Mechanical Engineering
The Cooper Union for the Advancement of Science and Art
-------------------------------------------------------
On Mon, 11 Aug 1997, Jeffrey Strauss Morehead wrote:
> Can you parallel a 9.6v eight pack NiCad cell to the HB Nicad pack? Has
> anyone done this with success? If so, does it charge properly?
>
> jm
>
> On Thu, 7 Aug 1997, MAR ERICSON wrote:
>
> > If you try to regualte the voltage to 3V You will still loose the extra
> > power as in using a resistor. You lose it in the form of heat to be
> > specific. Using a regulator will give you the 3V you need at continuous
> > output. I'm not sure how voltage regulators behave at 1 ms PWM switching.
> > Maybe someone knows or you can check the specs of the IC you plan to use.
> > The better alternative is to check the HB HP FAQ on using different motor
> > power sources. I think its better to use an external source so you won't
> > interfere with the HB power and you can use alkalines for the motors so
> > they last a little longer. My opinoin anyway.
> >
> > -----------
> > ericson mar
> > Master of Engineering Candidate
> > Project: Mobile Robotics
> > mar@cooper.edu
> > (212)353-4356
> >
> > Department of Mechanical Engineering
> > The Cooper Union for the Advancement of Science and Art
> > -------------------------------------------------------
> >
> > On Mon, 4 Aug 1997, Mike Downey wrote:
> >
> > > I have a cute little tracked robot base i want to run from a handyboard,
> > > but the problem is that it has 3V motors. The handyboard is set up to
> > > power 9v, right? The way i see it, i can either just put a resistor in
> > > series with the motor to drop the voltage reaching the motor, but that
> > > will eat up valuable battery power, or i can try to regulate the voltage
> > > coming out of the motor driver chips. Is there an easy way to drop this
> > > voltage?
> > >
> > > Thanks
> > > Mike
> > > --
> > >
> > > ,,,
> > > (o o)
> > > ==========================oOO==(_)==OOo==========================
> > >
> > > F U cn rd dis U mst uz Unix.
> > >
> > > http://www.eng.ua.edu/~mdowney
> > > Mike Downey mdowney@eng.ua.edu
> > >
> > > http://www.cw.ua.edu/ .oooO Oooo. http://www.bamamag.com
> > > ==========================( )==( )===========================
> > > \ ( ) /
> > > \_) (_/
> >
> >
>
>
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Message is in Reply To:
 | | More juice
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| Can you parallel a 9.6v eight pack NiCad cell to the HB Nicad pack? Has anyone done this with success? If so, does it charge properly? jm (...) (27 years ago, 11-Aug-97, to lugnet.robotics.handyboard)
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