On 05/26/2018 06:40 AM, andy pugh wrote:
On 25 May 2018 at 07:24, jeremy youngs <jcyoung...@gmail.com> wrote:
https://www.mouser.com/ProductDetail/CUI/AMT103-V?qs=sGAEpiMZZMsWp46O%252bq11Wc6D0rLp%252bQH%2fN7GEqDkL%2fc8%3d
Any thoughts? Seems like a good solution
I was expecting Jon Elson to chip in. I think he found an odd
accelleration lag with these encoders:
https://sourceforge.net/p/emc/mailman/emc-developers/thread/4DFC13BB.4020109%40pico-systems.com/#msg27669457
Yes, but it may not be as big a deal as I once thought.
Certainly, a lot of people have used them with Gecko 320
drives. But, yes, I rigged a motor to both an AMT103 and a
HEDS optical encoder, and fed both into encoder channels on
my PWM controller, so I could compare them sample by sample.
And, I did find a couple ms lag in response to
acceleration. Then, the AMT103 would show greater velocity
for a bit so the position could catch up.
So, it may depend a lot on the bandwidth of your servo loops
as to whether it causes any stability problems.
These encoders are CERTAINLY some of the least expensive
available. There is a little issue where the sensing rotor
can be a loose fit on the collet that fits over the shaft.
You really do NOT want the rotor to be able to rattle
around. Mariss Freimanis of Geckodrive suggests supergluing
the rotor in place.
Jon
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