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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.
Ian McLean

-----Original Message-----
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
through: http://www.youtube.com/watch?v=y3CwRT1_6Es

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
> has
> > 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
> I
> > 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,
> and
> > 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
> brushless
> > 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
> spectrum
> > 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
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
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