On 5/2/2012 11:45 AM, Kirk Wallace wrote:
> On Wed, 2012-05-02 at 10:19 -0500, Jon Elson wrote:
> ... snip
>> It just seems to me that when the motor inductance causes the winding
>> current to lag
>> behind the current command from the microstep sine wave, the current control
>> logic will automatically become the same as a full-step drive, with no
>> special
>> function at all required.  But, I admit, I have not extracted the
>> schematic of
>> the drive to figure out if there is anything extra there.
>>
>> Jon
> I suspect the magic is in the Xilinx chip programming, so we'll probably
> never know what the magic is. I'd like to play with a couple of Pico PWM
> <...>

Thanks to all on the lively conversation. It's obvious I should consider 
these features when I finally spring for drives with higher current and 
voltage ceilings after I replace my aging, eBay-special, 
removed-from-equipment PacSci motors maƱana.

Through the wonders of Google search I see there have been papers 
published on the topic of electronic damping. They may well explain the 
"magic" Kirk refers to, but they don't mean anything to me since I don't 
access to the inner workings of the drive.

Thanks again.

Regards,
Kent


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