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Re: Toroid Design .
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
> >
> >
> >
>