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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Thu, 7 Aug 1997 17:33:14 GMT
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Original-From:
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Romklau Nagamati <nagamati@netcom.STOPSPAMcom>
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Viewed:
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1353 times
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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 has 2 Replies:
 | | Re: 3v motors
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| Yes Vs should stay at 5v, but if you read my original message the best thing is to use 9.6 volt motors!! Save yourself some trouble! jm (...) (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
| | | Re: 3v motors
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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 (...) (27 years ago, 9-Aug-97, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: 3v motors
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| 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 (...) (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
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