Re: Hysteresis vs synchro motors for TC work

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>

I agree.  I also have one of Dr. Resonance's hysteresis motors and it is NOT
a problem.  Right now i'm flicking the switch a few times (big deal, so
what), and i'm also working on a phase motor controller so it won't be any
problem at all.

Dan


> Application note on hysteresis synchro type motors:
>
> The best to use without any fuss is of course the true salient pole
synchro
> motors.  Problem is the higher cost.
>
> The small hysteresis type synchro motors that we recently made available
to the
> Tesla list members work great at a reasonable price.
>
> Some members assumed these motors would not work and would "random sync"
all
> over the 360 degree circle ---- not true at all.
>
> When you activate the motor it always syncs in one of two places (1) right
on
> the 60 Hertz peak in which case the motor is snycing with the four "flats"
> ground on the armature, or (2) at 45 degrees off the 60 Hertz peak in
which
> case the motor is syncing with the "90 degree corner of the armature".
>
> It seems they sync approx 70% of the time right on the peak and the
remaining
> 30% of the time at the 45 degree off-peak location.
>
> We applied 4 flourescent dots (office supply store) near each electrode
and use
> Terry Fritz's small 12 VAC LED driver circuit to work as a cheap strobe.
We
> used Digi-Key part number 67-1604-ND which is a high-brightness white LED.
Cap
> is p/n P944ND and two resistors required, p/n's ALSR1J-10-ND and
> ALSR1J-560-ND.  A 1N4001 and a small 12 VAC xmfr from the junkbox finished
out
> the project.
>
> Mount the white high brightness LED on a small plastic "stalk" approx 2.5
in
> away from your stationary electrodes.  It fires and you can see the
flourescent
> dots from nearly 6 feet away from the coil.  A few quick on/off flicks of
the
> additional "strobe switch" on your control panel and you are always in
sync.
> Once sync is achieved it will stay there -- it does not "wander".
>
> You will find you will hit sync most of the time your turn on the RSG.
Only a
> few times you will have to hit the on/off switch.
>
> We've used this same circuit on 2 HP hysteresis synchro motors with larger
> coils, and it works perfectly.
>
> Bottom line is you can use the hysteresis synch motors and they work fine
if
> you are willing to hit the on/off switch a few times.  A simple tradeoff
to
> save money on the more expensive salient pole type synchro motors.
>
> Best regards,
>
> Dr. Resonance
>
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