Alt-BEAM Archive
Message #09101
To: beam@sgiblab.sgi.com
From: jester96beam@iname.com
Date: Wed, 12 Jan 2000 15:49:23 +0100
Subject: Re: photopopper head?
> You could probably attach out for the motors to the inputs of an H-Bridge.
Now you have a phototropic head (if the mechanics are right). The only
problem would be if BOTH SEs want to fire at once, but this is very rare.
There is away to adjust the H-Bridge with a diode to fix this problem, but I
can't remember what it is. I'm sure someone else here knows.
>
> Chris
>
> ---- you wrote:
> > But a photopopper never backs up.
> >
> > How would the head turn in both directions in this case?
> >
> > Evan Dudzik wrote:
> >
> > > it could... should work fine.
> > >
> > > --- johannes urke
> > > wrote:
> > > > i was wondering since i now have a photovore brain
> > > > from chiu`s tutorial done
> > > > if it could be connected to one motor making it a 1
> > > > dof head?
> > > >
> > > ______________________________________________________
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> > > >
> > > >
> > >
> > > =====
> > > +------------------------+
> > > |http://surf.to/photovore|
> > > |Photovores online! |
> > > |Evandude Dudzik |
> > > +------------------------+
> > > __________________________________________________
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> >
>
>
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>
9102 Wed, 12 Jan 2000 12:46:36 -0500 [alt-beam] Re: pancake motors "Dennison Bertram" This is a little bit of an abrupt statement, but if the motors came out of
something as old as a 5 1/4" drive, then they're not worth it. In general
these motors were built for higher voltages and current. In the 'old days'.
dennison
>>>
OK, let me make sure we're on the same page with the pancake motors here.
I'm looking at the guts of a 5 1/4" drive right now, and I see two motors
of interest-one of them is pretty big, and it essentially a big flat
magnet mounted on a circuit board with driver circuitry and a bunch of
coils under the magnet.
Now, there's also another, smaller DC motor that is still quite flat, but
somewhat smaller, and not on a circuit board. It's got 5 wires, so it
must be a stepper.
So, which one of these are you referring to?
I have also seen "board motors" like this in the many VCRs I've taken
apart.
And they're in all drives, basically, just in different sizes.
It seems to me that since there's drivers for the board motor on the
board, how hard could it be to run the thing?
jonathan
p.s. why is everyone whining about driving stepper motors? wouldn't it be
simple to interface to a microcore, bicore, etc. on the TTL level to a
stepper driver circuit?
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