Re: Sync Motor Wanted

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

Original poster: "Jim Mitchell" <Electrontube-at-sbcglobal-dot-net> 

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.........
 >
 >