At 12:20 AM 6/6/2008, you wrote: > Aram, > >i talk to company that manufacture encoder with 5 000 000 pulses per rev. >the problem is that that encoder has MAXIMUM rpm less than 200 rpm!!! >so that encoder can be speen faster than 200 rpm because frequences not >enogh to keep so much pulses. >if you want speen faster get lower resolution incoder 1 000 000 pulses per >rev. > > >I am not sure which way you are going. >5,000,000 pulses per rev at 200 rpm gives a 16,000,000 pulses per second >which means you have to handle 32 MHz signals to be able to count the pulses. >These are (sorry for the wording) insane data rates.
One reason for such high res. encoders is to get good velocity resolution even if the position resolution is not needed. In times past you would use the encoder you needed for position resolution and a good analog tach and velocity amp to do such things. You see that kind of stuff on EDM machines. Now days the insane digital rates are cheaper then the analog stuff and the people who really understand how to design good analog systems. The 200 rpm limit is likely a bandwidth limit on the electronics in the encoder, but there could also be some mechanical reason. __________ Andre' B. Clear Lake, Wi. ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
