Here is one of several links to bypass style vacuum motors.
http://www.electricmotorwarehouse.com/Dayton/ametek/ametek_b.htm
I Googled:
ametek lamb bypass vacuum motors
to get to it.
Ametek and Lamb are the brands we used 'way back then.
I don't think we actually needed the bypass style in one machine we
built, but they are quieter than the air-through style. In our largest
machine, an electron microscope turned backwards to write on microfilm,
we had 3 roughing pumps, several cooling blowers and 4 of the simple
Lamb air-through vacuum motors running at the same time, 24 hours a
day. It was so noisy that a few extra vacuum motors didn't matter. Off
topic, but the machine comsumed 5 1/2 KW of 3 phase 208 to produce a
one microamp beam at 20,750 volts.
In another stand alone machine (that copied microfilm to microfiche)
that was usually located in a separate room, noise was an issue, so we
used the bypass vacuum motors.
Pete Stanaitis
----------------
Mark Ludlow wrote:
Got and literature or pictures, Pete? Or current URLs?
Thanks, Mark
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
Pete&Sheri
Sent: Saturday, November 13, 2010 4:56 PM
To: Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] Reinventing wheels, and fans!
At least a couple of mfrs make "bypass" style vaccuum motors. 'Way
back in the 1970's we used them for loop boxes on tape and film handling
systems. IIRC, some of them were capable of around 12" WC compared with
the "through" models that could do 19" WC. Not 12VDC, of course.
Pete Stanaitis
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