Hi Mikael!
First of all, my compliments on the pics - they were good and clear. I've
threaded a few comments into this, but my first reaction was to hunt for the
ends of the two pipes and see were they fed through anything. I also note
that the angle of mounting is very adjustable, and probably important. Either
that or it is under pressure to turn, which I doubt.
Was it Mikael who wrote on Monday 02 September 2002 13:03:
> The shaft is a very light-weight array of printed copper strands on a
> hollow shaft.
Hmmm..... a pcb motor. You may have seen a 'pancake' motor on fans; these
have a flat pcb mounted armeture, but the pcb motor has this flat motor
armeture in a U shape. Rapid response, and low inertia are the benefits.
EXPENSIVE!
> These copper strands are going along the shaft forming a
> commutator and there are 4 large magenets, square angled to each other
> surrounding the shaft. The shaft slides over the top of a fixed metal bar
> (part of the shell/case). The shaft is not physically supported at the end
> it slides into (where metal bar is attached) because enough support is
> provided via 2 supports at the opposite end (the shaft encoder stage and
> main joint). The shaft is driven by 4 brushes on springs at 90 degree
> angles to each other and are doubled up to form a 2 wire dc motor which
> works smoothly in either direction (minus the squeeking) at an expected
> power level (200 mA @ 5 v).
That's not reason enough for it - not even for IBM. That thing will cost
$$hundreds.
>
> I haven't rung IBM about it jet thinking they would be the same as any
> other co but since you mention this i will give it a try :)
>
> One more thing to note, it has a stiker covering the protective cover of
> the shaft encoder circuitry saying "Caution: use capstan protective cover
> while cleaning vacuum columns". This looks quite clue-full, what is a
> capstan?
Basically as described in another reply. My work on tape machines is limited,
but there is a vacuum arrangement to keep a bit of tape on these high speed
tape machines. This reference has a different machine in mind, but gives an
explanation.
www.me.cmu.edu/research/highspeed.html
Would it regulate a vacuum? If the vacuum was available on the 10mm shaft,
could it be regulated by this thing?
--
Regards,
Declan Moriarty
Applied Researches - Ireland's Foremost Electronic Hardware Genius
A Slightly Serious(TM) Company
Experience is like a comb,
that Life gives you - AFTER all your hair has fallen out!
>
>
> ----- Original Message -----
> To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]>
> Sent: Monday, September 02, 2002 10:28 PM
>
> > Was it Mikael who wrote on Saturday 31 August 2002 11:08:
> > > Hello everybody!
> > > I got given a device from some sort of industrial machine. The
>
> manufacturer
>
> > > is IBM but I cannot find any information on it.
> > > It has a shaft encoder and circuitry on it with a fibre optic lead, a
>
> wire
>
> > > lead with 5 pins and it also has 3 small plug outputs (ground, a, b).
> > > It has 2 gas in/out's, one has large plasic 30mm tube and other is a
>
> fixed
>
> > > 10mm tube connection on body.
> > > The body is mostly aluminium and part of motor casing looks stainless
> > > steel. It has the following labels:
> > > IBM part number 1766700 and ratings: 25A max, rpm 11,00 max, volts/krpm
> > > 4.5..
> > > It also has a sticker saying "ETN. plant 51. Date:" and it also has a
>
> label
>
> > > saying Hopi electronics with date 4/29/85
> > > When I open it up, it has 4 big magnets and a small toilet-roll type
>
> shaft
>
> > > that spins around serving no aparent purpose with 4 brushes contacting
>
> it.
>
> > > The device is rather bulky for the power of the motor so and since it
> > > produces no suction It obviously relys on getting it from somwhere.
> > >
> > > anyone know what this thing is?
> >
> > How was the shaft driven? Can you post a pic? Could be a tacho or
> > resolver
>
> of
>
> > some sort. I would ignore the gas things in figuring out the electrical
>
> end.
>
> > I have also seen A.C. feedback encoders as a way of feeding back motor
> > position. Have you rang IBM, and asked for specs on that part. They're
> > surprisingly good at that. They even had a memory chip for an original XT
> > computer that featured a 16pin dil with another 16 pin dil soldered on
> > top and sold me one in the mid nineties :-/.
--
Author: Declan Moriarty
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