[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [TCML] tripolar coil
Might be easier to use RC grade brushless motors/ESCs for speed control. I
intend to try that eventually!
On Mon, Feb 18, 2013 at 6:30 PM, David Thomson <
> There certainly will be challenges, but the idea is to explore new ways of
> manifesting streamers. I'm not sure what the limits of the controller are,
> yet. But I do know that my immediate requirement is only for tens to a few
> hundred Hertz.
> Another potential application is for driving BLDC motors at programmable
> speeds to explore the effects on the spark gap break rate.
> On Mon, Feb 18, 2013 at 3:05 PM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:
> > On 2/18/13 12:43 PM, David Thomson wrote:
> >> I found a really neat digital three phase controller kit online. There
> >> are
> >> at least two companies who provide these. There is a difference in the
> >> way
> >> the PWM is implemented.
> >> http://www.freescale.com/**webapp/sps/site/overview.jsp?**
> >> code=WBT_MOTORPWMTUT_WP<
> >> One is based on the beginning of the signal and the other is based on
> >> center of the signal. Sine wave applications would likely do better
> >> the center-based signal. I would imagine a tripolar TC would do better
> >> with pulse signaling at perhaps 10% duty cycle.
> >> Since my present project requires sine waves, I'm using the Freescale
> >> at:
> >> http://www.freescale.com/**webapp/sps/site/prod_summary.**
> >> jsp?code=3PHASELV-KIT<
> >> Texas Instruments also has a kit:
> >> http://www.ti.com/tool/**drv8312-c2-kit<
> >> Both of the above kits comes with a USB controller, and software. The
> >> Freescale kit also includes a BLDC motor and everything is preinstalled.
> >> I envision this controller kit being able to control solid state relays.
> > Of course, these things are for frequencies down in the tens/hundreds of
> > Hz range.. as opposed to 100-300 kHz..
> > consider a small demo with 3-6 coils, each a NST sized (say a 4" diameter
> > secondary and 0.015 uF primary L).. the fRes is going to be 200-300 kHz.
> > (as opposed to running 3 coils off 60 Hz three phase, so the "bangs" are
> > distributed among the three coils in sequence.. which might also be
> > interesting to watch)
> > ______________________________**_________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/**listinfo/tesla<
> Tesla mailing list
Tesla mailing list