Subject:
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Re: "Servo" Driver for NQC
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 29 Jan 2002 23:41:06 GMT
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Viewed:
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818 times
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"Stephen Edwards" <lego-robotics@crynwr.com> wrote in message
news:3C56AA4F.4090501@cs.vt.edu...
> > when it gets within a certain number of counts on the rotation
> > sensor, jumps to a slow speed by pulsing the motor (on, wait 1, off, • wait
> > 1).
> I take it you are really doing on...float...on...float cycles
> with your motor instead of using "off", which actually performs
> active braking (on/off cycles are almost guaranteed to give serious
> mechanical jitters).
Nope, I'm using Off, because I need to brake the motor to pulse it. Floating
it does almost nothing - the inertia of the motor carries it on just as if
it wsan't powered. To get a low speed using this method, you must Off
(brake) the motor.
> with lightly loaded motors, however. Finally, gear trains can have
> huge effects too, so be sure yours can be driven backwards easily and
> smoothly, so that the momentum of the moving pieces works for you
> during "float" periods.
No problems there, I just need to find someone who's doing the same thing as
I am (pseudo-servo with a rotation sensor).
I find it hard to believe (and admitedly, quite frustrating) no one else is
doing this...?
Iain
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Message has 1 Reply:
 | | Re: "Servo" Driver for NQC
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| (...) I have to disagree with your approach. Even at low speeds, alternating between pushing on the gas and stamping on the brake isn't the way to drive smoothly. Perhaps you need to gear the machine differently and use less power during the ON (...) (23 years ago, 29-Jan-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: "Servo" Driver for NQC
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| Rebel Transcanner wrote: > (...) I take it you are really doing on...float...on...float cycles with your motor instead of using "off", which actually performs active braking (on/off cycles are almost guaranteed to give serious mechanical jitters). (...) (23 years ago, 29-Jan-02, to lugnet.robotics)
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