sam sokolik wrote: > I have started looking at the scales that came with the mill we are > working on - I had figured that the where some version of a linear > resolver... bit it isn't 1 coil in - 2 out for sin/cos. The way I > understand it - the send a 250hz square wave to the outside of each > coil. the 2 centertaps are summed together to get the position. (I > assume the output of the centertap is the reletive postion comparing it > to the input square wave. I was thinking that maybe something like JonE > resolver to quadature converter would work - but I am not sure now... > We could always resorect the old circuits.. :) but I would rather not. > > This sounds like a GE inductive, variable reluctance scale. One side is just a steel bar with a bunch of teeth and slots cut in it. The presence or absence of the teeth changes the magnetic reluctance at the coils. With only two coils, there is no way to use the Analog Devices resolver converter. It needs a 3-coil, transformer-type resolver which doesn't need a lot of drive current.
If you have any more info on these scales, let me know, I have looked at a few of these. Jon ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
