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RE: [TCML] ARSG question
Great video! You have basically done the sensible experiment Scott has
suggested for me and have proven that with careful shielding and allowing a
big enough mesh size, that at least I would be able to send the radio signal
to an ESC successfully. Running the gap motor from a Lithium Polymer
battery would mean no external connections other than the tank to the spark
gap itself and the motor and ESC/Rx part could be well shielded, as long as
2.4GHz radio signals can get through - so I am thinking that this is at
least worth a try. I think I may also go with Scott's suggestion and go for
the propeller gap design for its simplicity. However, torque is really not
an issue these days - there are some crazy scary brushless motors out there
now that will run stuff much bigger than your quad-copter as you probably
know. In fact, there are now brushless motors running on 100A/44.4V ESCs
that will allow full aerobatic 3D flying with RC helicopters over 5kg with
800mm blades! I am thinking of trying both the VFD/3ph approach and this
one and seeing which works best. It would be awesome to be able to control
the gap BPS with a remote control though! It will be some time before I get
to this stage but when I do I will keep the list posted on progress.
Thanks alot for the responses.
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Kramnik Daniel
Sent: Tuesday, 3 September 2013 4:12 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] ARSG question
The Tx/Rx should work fine, so long as your faraday cage shields well
against your coil's RF, but allows enough of the microwave signal to pass
I'd be more worried about noise affecting the ESC's control electronics.
On Mon, Sep 2, 2013 at 1:46 PM, Scott Bogard <sdbogard@xxxxxxxxx> wrote:
> Hi Ian,
> I have nothing useful to say here except that would be awesome if
> it worked!!! My biggest concern would be the RC receiver, I know
> dimmer switches don't work well, and sufficient shielding would surely
> block the signal from the remote. If you have an RC car I would
> suggest you just try running it near an active coil in a little
> Faraday cage and see if it works, I do also know those motors are
> designed for speed and not torque, so your rotor would have to be
> really light (but with those RPMs you'd have to be a fool to not want
> to go propeller style anyway, simplest mechanical gap construction
> ever!) Let us know how it goes, hopefully someone else will comment!
> Scott D Bogard.
> On Sun, Sep 1, 2013 at 10:29 PM, AusTesla <austesla@xxxxxxxxxxxxxx> wrote:
> > I have a question for the list regarding ARSG operation. I notice
> > this
> > been talked about just recently in regards to using a 3ph motor with
> > VFD, an option I am considering as the price of VFDs has fallen
> > considerably and
> > can get a 3ph induction motor, wound for 240V 3ph, cheaply. I am
> > not too keen on using a universal from a power tool because of speed
> > and torque stability and issues with overshoot.
> > I am in the process of building a large (10" secondary) spark gap
> > coil,
> > because my cap will be significantly STR at 100nF, I am strongly
> > considering ARSG operation.
> > Has anyone tried using a brushless RC motor with an ESC to control
> > the asynchronous gap speed? Of course this also raises the
> > possibility of using a remote control to change motor speed. Large
> > versions of these
> > motors have considerable torque and are speed stabilised by the ESC.
> > I can't imagine that the load on, say, a 12" rotary platter, would
> > be much greater than a large RC helicopter. I haven't done the
> > maths so I am not sure. The question I have is how susceptible
> > would 2.4GHz spread
> > radio signals be to the coils RF? The coil I am building will have
> > a projected resonant frequency of around 75kHz as calculated by JavaTC.
> > Regards,
> > Ian
> > _______________________________________________
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