If the problem is bursting that many counts, why not make the
converter divide the counts down to something manageable like 2500 per
rev?
Brian
On Fri, Apr 29, 2011 at 12:31 PM, Peter C. Wallace <p...@mesanet.com> wrote:
> On Fri, 29 Apr 2011, Jon Elson wrote:
>
>> Date: Fri, 29 Apr 2011 11:24:50 -0500
>> From: Jon Elson <el...@pico-systems.com>
>> Reply-To: EMC developers <emc-developers@lists.sourceforge.net>
>> To: EMC developers <emc-developers@lists.sourceforge.net>
>> Subject: Re: [Emc-developers] Fanuc converter
>>
>> Peter C. Wallace wrote:
>>> Certainly at high speed the interpolation is not of much use, but the
>>> interpolator will of course also go bad at 0 speed.
>>>
>> No, the analog values from the encoder disc should be perfectly accurate
>> at 0 speed. It is just analog sin/cos interpolation of the optical
>> output from the disc.
>>> We've considered using such and interpolator with our embedded motion
>>> controller to avoid the (expensive if embedded) divide used for velocity
>>> estimation. The interpolator is just a second order DPLL, fairly easy to
>>> build
>>> into the encoder logic, and has the advantage that the velocity falls out
>>> directly from the first accumulator.
>>>
>> If you are trying to interpolate an already-digital signal, then what
>> you say is true. But, analog interpolation works at zero speed, and can
>> improve positional resolution as well as velocity.
>>
>> Jon
>
>
> Yes, I was thinking digital, The sine/cosine ones typically go bad at higher
> speeds.
>
>
> Peter Wallace
> Mesa Electronics
>
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