Subject:
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Re: 3v motors
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 9 Aug 1997 22:53:35 GMT
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Original-From:
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MAR ERICSON <mar@cooper/Spamless/.edu>
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Viewed:
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1555 times
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Yeah, you're right. I hadn't realize that constraint of the L293's. Sorry :b
-----------
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
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On Thu, 7 Aug 1997, Romklau Nagamati wrote:
> With the modification mentioned in the the FAQ, can you power 3V motor
> at 3V with external power? The FAQ mentions external 6-36V and L293D
> spec sheet says that the minimum Vs is Vss (which has a minimum 4.5V).
> The modification doesn't change Vss, does it? So, it should stay at 5V
> implying Vs 5V minumum also?
>
> I'm trying to do the same thing he does; but trying to drive a Tamiya
> planetary geared motor (rated 3-4.5V at 0.7amp) using 6V external
> power and try not to run it for long or at high duty cycle. Also, I switched
> to SN754410NE instead to get the current rating I can be comfortable with.
>
> --Ron
>
> >
> > 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
> > > ==========================( )==( )===========================
> > > \ ( ) /
> > > \_) (_/
> >
> >
>
>
> --
> |o+------------------------+ |o|
> |o| Ron Nagamati | Censorship: |o|
> |o| nagamati@netcom.com | Art made tongue-tied by authority. |o|
> |o+------------------------+ William Shakespeare |o|
>
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Message is in Reply To:
 | | Re: 3v motors
|
| With the modification mentioned in the the FAQ, can you power 3V motor at 3V with external power? The FAQ mentions external 6-36V and L293D spec sheet says that the minimum Vs is Vss (which has a minimum 4.5V). The modification doesn't change Vss, (...) (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
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