On Sat, May 26, 2018 at 9:23 AM, Jon Elson <el...@pico-systems.com> wrote: > On 05/26/2018 10:54 AM, Chris Albertson wrote: >> >> I had to look up the link to see how it is possible for an encoder to >> cause lag. Only by not having enough resolution for low speed >> operations >> > The AMT encoders use interpolation of a very low resolution basic sensor. > They must have some kind of velocity tracking loop. When velocity changes > suddenly, the position of the tracking loop falls behind the actual > position, and the loop is commanded to speed up.
Looks like I guested right, low resolution encoders require a long sample period to avoid quantization error. There is a solution. You stop COUNTING encoder ticks and measure the TIME between the ticks. But this requires an encoder that gives acce to the actual edges of the physical encoder disk. -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
