Re: [TCML] tripolar coil

[David Thomson <tcbuilder@xxxxxxxxxxxxxxxxxxxxxxxx>]

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 the
center of the signal.  Sine wave applications would likely do better with
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 kit
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.

Dave




On Sun, Dec 23, 2012 at 11:59 PM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:

> On 12/23/12 6:45 PM, David Speck wrote:
>
>> Jim,
>>
>> I think that a three phase system would be unlikely to do anything
>> special, even if you could come up with an LC arrangement that would
>> work (and I can't think of one).
>>
>> If you are using a spark gap coil, the breakdown of the gaps would be
>> too random, independent, and chaotic to make any sort of interesting
>> pattern.
>>
>>
> No.. one gap.. when it fires, the three coils run 120 degrees of RF apart
> (just like in a bipolar coil, the two coils run 180 degrees apart)
>
>
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