On 14 Apr 2012, at 13:38, Erik Friesen <e...@aercon.net> wrote:

> 
> #1  Use more hall sensors and a sine lookup table.
> 
> #2  Use hall sensors + angle sensing by current pulsing/reading.
> 
> #3  Sync the halls with the encoder some way. (not a good option in my
> books)

With a suitable drive the LinuxCNC "bldc" component can do all three of these. 


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