Re: [CAD_CAM_EDM_DRO] motor types

Hi Weyland,

Could be that the motor just has a tachometer to regulate the motor's speed
exactly and not an encoder. If you knew what the motor had been used in, you
would have a better idea. If it came out of a plotter, it would almost
certainly be a servo with an encoder (although the ones I have seen usually
have more wires), but if it came out of something like a tape deck or video,
it would be a motor with a tach.

Ian
--
Ian W. Wright
Sheffield UK
www.iw63.freeserve.co.uk

----- Original Message -----
From: "Weyland" <weyland@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: 19 August 2001 20:24
Subject: Re: [CAD_CAM_EDM_DRO] motor types


> From: <info.host@...>
>
> > Weyland, look closely along the armature for anything other than
bearings.
> > The armature will only join to bearings if it's a normal motor. The
weird
> > pattern you see is almost certainly just the windings. They are wrapped
> > around a laminated core pattern on a few motors I've taken apart to
limit
> > induced eddy currents in the former they are wrapped on (Like in a
> > transformer). The encoder, as I've found out this week, for most CNC
type
> > servos is a round disc. The disc is on the rotor and as the rotor turns
so
> > does the disc. There are detectors by this disc that send each time the
> > signal is broken and started, creating pulses, the coding. Check what
the
> > little PCB actually attaches to except those wires, does it have any
> others
> > leading off it?
> >
> > John
>
> Heilsa John~!
>
> I tried to get a better look, but I can't get the *possible* encoder
> off the back right now, as I don't have an allen wrench small enough
> to undo the set screw. (:<)
>
> I *did* say "phukkit" and hooked the two wires coming out
> of the actual motor (brown and purple) to the yellow and black leads
> out of a computer power supply.
>
> Zing~!
> Spun like a mutha.
> Reversed the wires.
> Zing~!
> Same thing, only opposite.
> Took the gear reduction off and put it on the shelf.
> I'm starting to think this *is* a servo...
>
> All I gotta find out is what the each of the three wires on the encoder
> do...
> and which gets what for power, etc...
>
> Weyland
>
>
>
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