http://www.leinelinde.com/Products/
I took a fast look: Encoder http://www.leinelinde.com/Documents/Brochure/700_Series_eng.pdf with up to 10 000 ppr equal to a little bit less than 14 bits resolution which I assume be more or less equal to accuracy. Resolver http://www.leinelinde.com/Documents/Brochure/600_Series_eng.pdf with up to 19 bits resolution. Encoders usually have quadrature output signals and are incremental. Resolvers usually need to be driven by at sinus input voltage, sense difference between sinus voltages and are absolute. I guess voltage levels on both are rather standardized. Both may be fitted with standard industrial communication like profibus DP or CAN instead of direct signals. I guess the big question is if angle sensor or other mechanical limitations are limiting the accuracy or control loop. The control loop need some extra resolution to be effective so I would guess a resolver with same accuracy as an encoder but higher resolution would be a better choice. Nicklas Karlsson On Sun, 01 Feb 2015 08:25:48 -0800 Kirk Wallace <[email protected]> wrote: > ... snip > > >>> I think that the servos + resolvers will work a fair bit better than > >>> steppers. I was rather upset when I found that my ebay bargain servos > >>> had resolvers, but now I am something of a fan of the devices. > >> I have to agree, if they are used correctly with good electronics to > >> drive them, they are very good and they last. > > ... snip > > For most cases, my vote is with encoders, but if the resolvers are > installed and working that's a plus for resolvers. I didn't have an > option at the time I converted my lathe: > http://www.wallacecompany.com/cnc_lathe/HNC/00006-1a.jpg > http://www.wallacecompany.com/cnc_lathe/HNC/ > > http://www.heidenhain.us/enews/stories_0411/AUmain.php > -------------- > "SUMMARY > Resolvers provide absolute position information and are capable of > operating in relatively high temperature and shock environments because > they are similar in construction to the motor itself. However, they are > inflexible in their application, and must be specifically "tuned" to > meet the drive system requirements. Encoders on the other hand, can be > absolute or incremental, simplify the design task, are more accurate, > allow for a wider dynamic range and are more flexible should changes be > necessary in the future." > > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/ > > ------------------------------------------------------------------------------ > Dive into the World of Parallel Programming. The Go Parallel Website, > sponsored by Intel and developed in partnership with Slashdot Media, is your > hub for all things parallel software development, from weekly thought > leadership blogs to news, videos, case studies, tutorials and more. Take a > look and join the conversation now. http://goparallel.sourceforge.net/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users -- Karlsson & Wang <[email protected]> ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
