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Re: Toroid Design .
to: John
If you are referring to the drive belt between the lower spray pulley and
the motor --- none if at all. We use 1/2 hp drive motors on our systems
and have never noticed this effect. When I see Dr. Herb this summer I was
ask him if this has affected his Pelletrons. It may only show up in
smaller machines driven with small fractional HP motors.
DR.RESONANCE-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Toroid Design .
> Date: Thursday, December 31, 1998 6:43 PM
>
> Original Poster: "John H. Couture" <COUTUREJH-at-worldnet.att-dot-net>
>
>
> DC -
>
> I was referring to the belt motor. Does the belt motor slow down as the
> voltage increases on the terminal?
>
> John Couture
>
> -------------------------------
>
> At 08:56 AM 12/30/98 -0700, you wrote:
> >Original Poster: "D.C. Cox" <DR.RESONANCE-at-next-wave-dot-net>
> >
> >to: John
> >
> >The pelletron type Van de Graaffs built by National Electrostatics
function
> >as excellent HV DC motors when the units are turned off. They will run
for
> >over 60 seconds on the stored charged.
> >
> >----------
> >> From: Tesla List <tesla-at-pupman-dot-com>
> >> To: tesla-at-pupman-dot-com
> >> Subject: Re: Toroid Design .
> >> Date: Tuesday, December 29, 1998 12:03 PM
> >>
> >> Original Poster: "John H. Couture" <COUTUREJH-at-worldnet.att-dot-net>
> >>
> >>
> >> Ed -
> >>
> >> Isn't the charge zero on the inside of the upper terminal during
VDG
> >> operation? How can there be an "up hill" effect for the charge on the
> >belt?
> >> I would consider it a "down hill" effect.
> >>
> >> The work to put the charge (100% eff) on the outside of the terminal
is
> >>
> >> W = Q x V joules per coulomb
> >>
> >> Have you found an equation to relate this work to the motor that
would
> >> indicate the motor slows down as the voltage on the outside of the
> >terminal
> >> increases?
> >>
> >> John Couture
> >>
> >> --------------------------------------
> >>
> >> At 08:17 PM 12/25/98 -0700, you wrote:
> >> >Original Poster: Ed Phillips <evp-at-pacbell-dot-net>
> >> >
> >> >" Jim -
> >> >
> >> > This is the first time I have heard that the Van deGraaf motor
slows
> >> >down
> >> >because of the upper electrode voltage. I thought the transfer of
> >> >charges
> >> >from the belt to the inside of the sphere was because the potential
on
> >> >the
> >> >inside of the sphere was less than on the belt.
> >> >
> >> > John Couture"
> >> >
> >> > The motor slows down (if it is of marginal power, at least) because,
as
> >> >the upper terminal voltage increases, more work is being done to move
> >> >the charges "up hill". Real effect!
> >> >
> >> >Ed
>