Alt-BEAM Archive

Message #12774



To: alt-beam@egroups.com
From: David Simmons devs@idirect.com
Date: Wed, 29 Mar 2000 21:39:59 -0800
Subject: [alt-beam] Re: looking for Stepper motors [to phillip]


Leonardo,

I have a PDF Document that explains Stepper motors in great detail,
however it is about 250k and not something to post VIA the list. If you
want it let me know and I'll sent it over.

Dave

"Leonardo Boulton F." wrote:
>
> OK, so i understand a normal electromagnetic motor rotates by the
> implamantation of something like an inductor. I mean, it is a coil that
> produces a magnetic field when current flows trough it. Then that field
> repels the other magnetic field (of the magnet inside the case)..... so
> it is a constant matter, because as long as current flows (or a voltage
> diferencial is presenta at the two ends of the coil) the motor will
> turn continuosly.... so, how's the thing with the stepper?. Now I know
> that you have to control it externally with some kind of digital
> controler (like a FSM), but how's is the physic of the matter?.
> Because, I recon it should be like the same thing, but with some kind
> of current controler that doesn't allow more than a given value of it
> to flow through the coil....
> Please, if you have time explain it to me a little farther.... thanks.
>
> --- "Phillip A. Ryals" wrote:
> > You can find stepper motors in all kinds of places, especially
> > computer
> > peripherals. Floppy disk drives are a good source, as well as
> > printers,
> > flatbed scanners, etc... Pretty much anything with a motor that's
> > controlled by a computer has a stepper in it.
> >
> > As far as their difference from normal motors... there's quite a bit.
> > You
> > need half-way complex control circuitry for them. They don't work
> > like a
> > normal motor in that you can't hook up a battery and expect one to
> > turn. It
> > takes voltage, and then a control signal to tell it which way to go.
> > In
> > addition, the signal has to be repeated because each pulse only makes
> > a
> > small movement (it steps). There are many tutorials on stepper
> > control
> > cicuits out there. Of course, the one you're looking at might have
> > this
> > built in.
> >
> > -phillip
> >
> > -----Original Message-----
> > From: owner-beam@sgiblab.sgi.com
> > [mailto:owner-beam@sgiblab.sgi.com]On
> > Behalf Of Leonardo Boulton F.
> > Sent: Wednesday, March 29, 2000 11:50 AM
> > To: beam@sgiblab.sgi.com
> > Subject: looking for Stepper motors
> >
> >
> > Hi, i found this photovore that works with an oscillator
> > (square-wave),
> > and it works with two stepper motors. Now, where can i found such
> > motors.... i understand some clocks work with stepper motors, but are
> > there any other places?....
> > And, i don't have quite clear what the difference is between a
> > stepper
> > motor and a usual electromagnetic motor.....
> >
> > thx.
> > Leo
> >
> >
> >
> > =====
> > I'm here... http://geocities.com/l.boulton
> >
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>
> =====
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>
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