Subject:
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Re: moving in a straight line with two motors?
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 13 Nov 1998 18:27:28 GMT
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Original-From:
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Eric Brandwine <ericb@mitre*nomorespam*.org>
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Viewed:
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2170 times
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> > > > > "eh" == Eric Hodges <eric.hodges@platinum.com> writes:
eh> -----Original Message-----
> > In order to regain the power of having 2 drive motors, you can run 2
> > motors off one output port, and couple the shafts together. Of
> > course, that brings the total motor count to 3, rather than 2, but it
> > still only occupies 2 of the motor outputs.
eh> I don't think it works that way. Will hooking 2 motors to the same power
eh> source provide twice as much power? I think the limiting factor is the
eh> current from the power source, not the number of motors. But I could be
eh> wrong.
Not that I have any facts to back me up.....
I looked at kekoa's pictures of the disassembled RCX.... The motor
driver chips are ELEX 10402B / 9980A / 4597. About which I was able
to find absolutely nothing. Oh well.
Most of the motor drivers that I have run across supply on the order
of 1 amp, to within a factor of 2 or so. 1300 mAH is generous for AA
batteries, and 7-800 is more like it. I am still on my first set of
batteries in my RCX, so I have 0 datapoints. (Once again, that lack
of facts....) However, I have had the thing running for at least a
couple of hours, most of it with 2 motors churning. That puts average
motor current draw at less than 1/4 amp per motor.
So I conclude, based on conjecture and hand waving, that it would work
as I stated. You do bring up a good point though. If anyone tracks
down a data sheet for that chip, lemme know.
ericb
--
Eric Brandwine, Systems Engineer | What is the definition of an engineer?
EricB@Mitre.org | Someone who solves a problem you
MITRE Corporation, McLean VA | didn't know you had in a way you
(703) 883-3319 F: (703) 883-1917 | don't understand.
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Message has 1 Reply:
 | | Re: moving in a straight line with two motors?
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| (...) There needs to be a link to this somewhere: Peter Phillips pointed out a long while back (my messages from him are dated Sep 21) that the specs to the chip are here: (...) drivers. I don't know if he told the rest of the list about this, if (...) (26 years ago, 13-Nov-98, to lugnet.robotics)
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Message is in Reply To:
| | RE: moving in a straight line with two motors?
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| -----Original Message----- From: Eric Brandwine [SMTP:ericb@mitre.org] Sent: Friday, November 13, 1998 8:39 AM To: John Scott Kjellman Cc: lego-robotics@crynwr.com Subject: Re: moving in a straight line with two motors? <snip> (...) I don't think it (...) (26 years ago, 13-Nov-98, to lugnet.robotics)
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