Alt-BEAM Archive
Message #12799
To: beam@sgiblab.sgi.com
From: owner-beam@sgiblab.sgi.com [mailto:owner-beam@sgiblab.sgi.com]On
Date: Thu, 30 Mar 2000 07:44:47 -0800
Subject: RE: looking for Stepper motors [to phillip]
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
>
>
>
> =====
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