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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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> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
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