Subject:
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Re: Motor mis-match.
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 15 Jan 2001 06:47:13 GMT
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Original-From:
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Russell Nelson <NELSON@saynotospamCRYNWR.COM>
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Viewed:
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551 times
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Steve Baker writes:
> We *need* stepper motors!
Noooooooo!!!!!! We need motors like servo motors, where they come in
a box, and have a built-in controller. Except that they need to be
multi-turn, and you need to be able to say "Measure the angular
momentum of the mechanism you're attached to." "Here are the bezier
points for your rotation vs time curve, and velocity vs time curve.
Can you do that?" And then the motor comes back and says yes or no.
If no, then you either buy a better motor or choose different points.
In other words, not only do you need something that's closed-loop, but
you need *it* to close the loop for you.
Actually, you need to be able to give it a range of possible angular
momentums (think of the shoulder of a robotic arm, where the arm may
be bent at the elbow), at which point it comes back and says "Yes, no,
or maybe". And then you say "do it", and it comes back and says "I
thought I could, I thought I could, I did!" Or else, um, it says that
it didn't.
--
-russ nelson <sig@russnelson.com> http://russnelson.com | Government is the
Crynwr sells support for free software | PGPok | fictitious entity by which
521 Pleasant Valley Rd. | +1 315 268 1925 voice | everyone seeks to live at
Potsdam, NY 13676-3213 | +1 315 268 9201 FAX | everyone else's expense.
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Message is in Reply To:
 | | Motor mis-match.
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| I was having a boring evening - so I decided to test some theories about Lego motors - and at the risk of seeming pedantic - here are my findings: Several times, people on this list have asked why their robots don't drive in a straight line - the (...) (23 years ago, 15-Jan-01, to lugnet.robotics)
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