Re: Tesla motor receiver

["Jim Lux" <jimlux-at-jpl.nasa.gov> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Almost any diode around will handle the few hundred kHz from a TC...
However, what you might want to do is hunt down some Schottky diodes, as
used in low voltage switching power supplies.  When you are drawing 50 Amps
from a 5 volt supply, you don't want a 1 volt drop across the diode
dissipating 50 watts...  You probably don't need a filter cap, since the
mechanical inertia of the motor would do that for you.  You might check for
the very low current high voltage motors which were described in an Amateur
Scientist column a few decades back, designed to be run from a kite and
wire....  Bearing friction will be really critical..

You also want VERY tight coupling on a receiver (i.e. no losses with
leakage inductance, etc.).. Tuning will be touchy, though.  Also bear in
mind that the amount of power you can extract is going to be, in a large
part, proportional to the size of your receiver....


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> From: Tesla list <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Tesla motor receiver
> Date: Tuesday, August 29, 2000 5:35 PM
> 
> Original poster: "Richard Barton" <richardbarton-at-caving5.freeserve.co.uk>

> 
> Hi all
> 	Further to my idea about building a tesla receiver
> to power a motor.... I've been looking through the CSN's
> and it seems that the receiver should be, in itself, a replica
> of a tesla coil, but working in reverse, whereby what is
> normally the secondary, is employed as a primary, being
> connected to an antenna, and the normal primary becomes
> the secondary, thereby converting the high voltage and low
> current, to a low voltage and high current.
> Am I correct in this ?
> My idea was to generally try and discover if I could place
> my receiver in fairly close proximity to my coil, and simply
> tune roughly to the output frequency, using a variable cap
> in the receiver, then rectify the signal and feed it to a tiny
> D.C. motor. The problem is, however, that it would still
> be R.F., so I think we would need to build this miniature
> coil (secondary and primary) as Tesla did.
> But how do we lower the frequency back down to a rate
> that a diode can handle ?
> 				~Richard Barton.
> 
> 
>