Stuart Stevenson wrote: > The opportunity is this. To get quadrature feedback into EMC2 from > the motors I will need a resolver to encoder converter or I will need > to install encoders on each motor on the X, Y and Z axes. I purchased > three converters, RD141S from AMCI. These introduce a 50 ms delay in > the feedback signal. Is this acceptable? I think, probably not. 50 ms???? WHAAAT? These must be made for DRO use only, not CNC. 50 ms is 50 default servo sample times, so no way would you be able to tune EMC2's servo response to work with this. > My question is this. Do I need to install encoders on the motors? My understanding of the Analog Devices resolver-digital chips is they use a phase locked loop to track the resolver position, and that will produce quadrature output that has very little lag from the real shaft position. So, if you can find a converter box that uses the AD chips it should get rid of most of the lag. These chips used to be insanely expensive, but they have come way down since about 2000. Their latest chip is an all-in-one solution, with no need for a CPU at all, and it produces ABZ right off the chip.
Jon ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
