Re: Sync Motor Wanted

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Eastern Voltage Research Corporation" <dhmccauley-at-easternvoltageresearch-dot-com> 

Flipping the motor switch on or off a few times before a series of runs
takes only about 10 seconds.  I usually do this with my 60Hz syncrhonized
strobe light as well to make sure its in the right position.  Its no big
deal and you only have to do it once as you can let the motor run between
power-ups
on your coil (i.e. demonstrations) etc...

Dan


 > But do you really want to be always flipping on and off if they don't sync
 > correctly?  Is there a way to make a hysteresis motor sycn at 90 degrees
 > every time?
 >
 > Regards - Jim Mitchell
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Friday, April 16, 2004 6:37 PM
 > Subject: Re: Sync Motor Wanted
 >
 >
 >  > Original poster: "Eastern Voltage Research Corporation"
 > <dhmccauley-at-easternvoltageresearch-dot-com>
 >  >
 >  >
 >  > Actually, I disagree.  Have the identical motors (which I purchased
from
 > Dr.
 >  > Resonance), and they appear to power up many more
 >  > positions than true 90 degree or 45 degree.  Seems there might be at
least
 >  > every 10 or 15 degrees (just visually anyways).
 >  >
 >  > Here is a picture of my rotary gap using a Dr. Resonance motor.
 >  >
 >  > http://www.easternvoltageresearch-dot-com/images/srsg01.jpg
 >  >
 >  > Dan
 >  >
 >  >
 >  >
 >  >  > These motors always sync at either true 90 degree (correct) position
or
 > 45
 >  >  > degrees off.  Flip the power switch on and off once or twice to let
 > them
 >  >  > coast for 5-8 sec, then back on at 30% variac power and you are in
 > sync.
 >  > If
 >  >  > you are not in sync you will know immediately by the length of the
 > spark
 >  > at
 >  >  > 30% setting.
 >  >  >
 >  >  > We've used dozens of these in 3-5 kVA coils and they work great
using
 > the
 >  >  > above procedure.  Try it and you will see what I mean.  They are
easy
 > to
 >  >  > synch with you finger on the on/off switch.
 >  >  >
 >  >  > Dr. Resonance
 >  >  >
 >  >  > Resonance Research Corporation
 >  >  > E11870 Shadylane Rd.
 >  >  > Baraboo   WI   53913
 >  >  >  >
 >  >  >  > Are these motors you are currently offering true salient-pole
 >  > synchronous
 >  >  >  > motors, or are they still the same motors you offered last year
that
 >  > were
 >  >  >  > NOT true salient pole motors? The 1/25 HP, 1800 RPM "synch
motors"
 > you
 >  >  >  > offered last year (Eastern Air Devices model H34BBM-8) turned out
to
 > be
 >  >  >  > hysteresis synchronous motors, and could start randomly at any
one
 > of
 >  >  >  > several possible rotor-housing alignments, requiring that power
be
 >  > cycled
 >  >  > on
 >  >  >  > and off until the correct angular alignment was eventually
obtained.
 >  > This
 >  >  >  > might be acceptable for some users for a low powered "hobby"
coil,
 > but
 >  > for
 >  >  >  > many applications this "hit-or-miss" randomness was not
acceptable.
 >  >  >  >
 >  >  >  > If you now have true salient-pole motors available, I'd like to
 > return
 >  > the
 >  >  >  > FOUR motors I bought (the hysteresis-synchronous motors, still
 > sealed
 >  > in
 >  >  >  > your original boxes) and trade them for the "real thing".
 >  >  >  >
 >  >  >  > Thanks!
 >  >  >  > Scott Hanson
 >  >  >  > ----- Original Message -----
 >  >  >  > From: "Tesla list" <tesla-at-pupman-dot-com>
 >  >  >  > To: <tesla-at-pupman-dot-com>
 >  >  >  > Sent: Wednesday, April 14, 2004 9:33 PM
 >  >  >  > Subject: Re: Sync Motor Wanted
 >  >  >  >
 >  >  >  >
 >  > msnip.........
 >  >
 >  >
 >
 >
 >
 >
 >