Subject:
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Re: non-linear motor speed problem
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 11 Mar 1997 16:51:37 GMT
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Original-From:
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Peter Harrison <(Peter.Harrison@cannock)stopspammers(.ac.uk)>
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Viewed:
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4295 times
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On Tue, 11 Mar 97 09:22:35 -0500 "Fred G. Martin"
<fredm@media.mit.edu> wrote:
> The test isn't fair under no-load conditions, because then the motor
> just spins when you give it any signal.
The (small) load presented by the gears makes it behave
quite well with pure DC
>
> Are you sure the performance is the same when you have a full
> operating load? This would not make sense; I would guess that this
> would mean that your normal load is well beneath the load capacity of
> the motors.
Sadly, the servo motors have oodles of oomph (the correct
technical term for torque etc). My little bot is really a
micromouse in training and very light so the load is not
huge.
I have no skills for gearbox building and no money for
expensive gearmotors. Will I have to hang weights on it to
load the motors :)
My main puzzle is just why the DC (eg single NICAD cell at
1.25V) runs the motor more slowly than the HB PWM drive at
a nominal 14% of 6V or so.
Is this just a 'feature' of PWM?
----------------------
Peter Harrison
Peter.Harrison@cannock.ac.uk
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