Subject:
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Re: Motor Speeds
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 25 Feb 1997 07:21:12 GMT
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Original-From:
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Chuck McManis <cmcmanis@netcom.SPAMCAKEcom>
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Reply-To:
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[cmcmanis@netcom.]StopSpammers[com]
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Viewed:
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1436 times
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Richard Vannoy wrote:
> Now this is starting to make sense. We use -100 to +100, but it does
> seem silly to have a resolution of 201. Much more logical that the
> routine converts to steps of lesser resolution, and 7 speeds certainly
> seem reasonable.
When I built the PWM controller out of a PIC I gave it 100 speeds
representing 0 - 100% width. So a speed of 50 is a 50% duty
cycle signaal. The disadvantage of the Handiboard scheme is
granularity. In particular I have found that for really high
performance motors, such as the ones on some of the RC platforms
I've converted, you have to use a feedback system to control the
speed, and the feedback system can't work reliably with just
7 speeds (it is too jerky) for highly geared motors it works
great.
But this isn't a complaint, simply a note of one of the limitations
of 7 speeds.
--
--Chuck McManis http://www.professionals.com/~cmcmanis/index.html
All opinions in this message are those of the author. No warranty as to
the suitability or accuracy is stated or implied. Use at your own risk.
cmcmanis@netcom.com +1.408.524.4805
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Message is in Reply To:
 | | Re: Motor Speeds
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| (...) Now this is starting to make sense. We use -100 to +100, but it does seem silly to have a resolution of 201. Much more logical that the routine converts to steps of lesser resolution, and 7 speeds certainly seem reasonable. (28 years ago, 23-Feb-97, to lugnet.robotics.handyboard)
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