Re: [sdiy] Telharmonium motors, perhaps?

[Roman]

I wasn't paying attention to this thread, so this might have been  said before.
It looks exactly like head driving motor from inkjet printer. They have clear plastic ring with bars on the back end of shaft (hidden in the plastic part as seen in the picture) to form typical incremental encoder. How many bars or PPR (pulses per revolution) I don't know, but they looked like 200 or so.
The one I looked at had only 1 output (no sine/cosine).

And why do they call it sinus? The output waveform looks very much like sinus bt it's not. It's just filtered square generated from slotted optocoupler. 

would they work as a VCO? I think so, they start/stop pretty fast in the printer, so response would be OK, OTOH may be driven in some kind of PLL to achieve constant head speed.
But anyway it would be rather high pitch, I guess few kHz minimum.
Unless you drive them with something else. Anyway, they make excellent, cheap rotary encoder, although large and heavy one.

Roman 
 
---- Wiadomość Oryginalna ----
Od: john mahoney <jmahoney at gate.net>
Do: synth-diy at dropmix.xs4all.nl
Kopia do: ASSI <Stromeko at compuserve.de>
Data: Tue, 23 Nov 2004 19:38:25 -0500
Temat: Re: [sdiy] Telharmonium motors, perhaps?

>> Any information on what exactly is meant by "sinusoidal encoder
>output"?
>>
>> Achim.
>
>I asked the Electronic Goldmine about data on those motors. Nothing,
>really. Here's their reply:
>
>
>Dear SIr,
>
>We do not have any additonal information (i.e. spec sheet, pin out,
>data sheet, etc.) on the G14783 motor.  I went to the shelf to get the
>part #/label info directly off of the motor.  Here it is:
>
>1298175
>EC 775596
>Buehler Products, Inc.
>Kinston, N.C.
>USA
>
>
>I suppose it's this company: http://www.buehlermotor.com
>--
>john
>
>