There has been some talk of the US Digital encoders on the Gecko group, it seems the newer ones aren't fitted with bypass caps. There's a fix you can do and then they are fine. Greg
----- Original Message ----- From: "Rainer Schmidt" <lemonn...@gmail.com> To: <emc-users@lists.sourceforge.net> Sent: Tuesday, June 16, 2009 3:51 PM Subject: Re: [Emc-users] Running the encoders directly to EMC > Skewered brushes make no sense at all. I agree. Skewered armature > prevents a rapid fall off of the magnetic field and thus yields less > 'chatter' if you wish to name it like that. If you would turn the > motor manually over then a 'regular' dc motor would go 'pop pop pop' > over the field boundaries as you manually break the hold, and a > skewered design is way less noticeable. Insert your own 'swosh swosh > or whop whop' haha. You get the point... > > And... keling is recommending the US encoders. And do not be afraid to > plop any encoder onto any motor with the right shaft. Encoders have > nothing to do with the motor characteristics. > There is no adjustment of an encoder to a motor except for the rear > shaft diameter and the max rpm so the poor thing doesn't fly apart. > Regular encoders are a bad match for 320,000RPM air drills for example > haha. That would be the fastest encoder in the world. parts will > literally break through the barrier of sound... > The encoder is a foreign object to the motor. The encoder is the right > hand of the controlling drive and thus all encoder parameters have to > be balanced according to resolution and drive it is connected to. > > I have no problem whatsoever viewing their website with Firefox, or > Safari, or Opera, or IE.... check your setup.... > > Best of luck! > Rainer > > PS:Be sure you have the right inertia match between servo and load. Or > the tuning can become a nightmare. Which it is in any case, more or > less, depending on the drive... Oh... and make sure that encoder and > drive use differential signals. Cheap options are without the > differential encoders and decoders.... It is mandatory in our > environment to use differential signals. If not, just use steppers and > forget about the servo as you loose all the precision benefits of the > encoder while corrupting the signal with a bad choice of transmission. > > ------------------------------------------------------------------------------ > Crystal Reports - New Free Runtime and 30 Day Trial > Check out the new simplified licensing option that enables unlimited > royalty-free distribution of the report engine for externally facing > server and web deployment. > http://p.sf.net/sfu/businessobjects > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.339 / Virus Database: 270.12.69/2176 - Release Date: 06/14/09 17:54:00 ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
