Re: The 1500t secondary myth (long)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>



We always use the motor with a belt drive to a pillow-block supported rotor.
This allows fast pulley changes to determine most effective dwell / bks/sec
values for any coil.  We mount the motor so it can slide up to 12 inches to
allow a wide range of pulley values.

I get them from a variety of sources:  Fair Radio Sales, Lima, OH,  C&H
Sales, Pasadena, CA, and R&D Surplus in Cleveland.

I will email Matt (my shop mgr when I'm gone) and ask him to look on the box
to see where the last batch came from.

DC

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, December 06, 2004 8:34 PM
Subject: Re: The 1500t secondary myth (long)


> Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>
>
> D. C.,
>
> I am getting tired of the loud gear growling from my angle grinder powered
> ASRG, and have been thinking of going the treadmill motor route.  What are
> your surplus sources for these motors?  Are the motor bearings good enough
> (e.g. very little axial motion) to mount the rotor directly on the motor
> shaft?
> Thanks,
> --Steve Y.
>
> ----- Original Message -----
> From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Monday, December 06, 2004 11:41 AM
> Subject: Re: The 1500t secondary myth (long)
>
>
>  > Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
>  >
>  >
>  >
>  >
>  > One "tunes" a sparkgap by adjusting the dwell time.  This is usually
>  > done by using a DC motor for the drive and then adjusting it's speed
>  > with a small variac/rectifier/cap combination.  We use a lot of
>  > the "tredmill" type motors available surplus.  We use 3,000 rpm motors
>  > with a 1-2 HP rating.  We usually mount the spark gap rotor in a pillow
>  > block configuration so we can change pulley sizes to adjust the rotor
>  > speed in a range that is most effective.
>  >
>  > You can also put a spark on both sides of the rotor and connect them in
>  > series.  This is usually done at power levels above 7.5 kVA to provide
>  > additional quenching.  You can also experiment with using one side of
>  > rotor (dual gap) or both sides of rotor (quad gap) to see the effect of
>  > quenching on your system.  Use a dual gap if possible at lower power
>  > levels so you don't end up wasting all your energy in the form of heat
>  > and light in the sparkgap.
>  >
>  > Dr. Resonance
>
>
>