Re: brushless servos without hall commutation

What drives are you using? Some drives can be programmed to look for
the index pulse then add some offset before using the encoder count
for cummutation. Some optical encoders also have commutation tracks
on them. The biggest hassle with using the encoder for commutation is
determining the proper alignment of the commutation signal with the
encoder.

~petev

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "bluecoast1" <bluecoast@h...>
wrote:

>
> Hi,
>
> I have a number of brushless servos I've collected to build some cnc
> machines. All of them have optical encoders of some resolution, but
> none have hall-effect sensors for commutation.
>
> What I am wondering is if there is any reason (I can't think of

any) why

> I couldn't divide the optical encoder output with a PIC or something
> to get a faked hall-effect commutation output I could use for a
> generic controller.
>
> Has anyone faked the hall-sensor arrangement somehow?
>
> bluecoast