Hi Jon, It would probably be easier to do it digitally. Tachos make the most difference at low speed and you could get a much smoother and more accurate low speed signal by doing it digitally.
Two charge pumps wouldn't work because the quadrature signal is symmetrical at all times. You would need to decode the quadrature signal into step/direction then feed the step signal into a charge pump and use the direction signal to invert the voltage. Les Jon Elson wrote: > So, I am going to have to develop the velocity value from the > quadrature signals. Since the chip interpolates the resolver to > 4096 counts/rev, I should be able to produce much better > resolution at reasonable speeds. For instance, at 60 RPM, you > get 4096 counts/second. At 100 counts/second, it would be > turning only ~1.5 RPM, so some really simple filtering should > work. I'm trying to decide if I should do this digitally or > have encoder counts produce fixed-width pulses on a pair of > charge pumps, one on each input to a differential amp. > Digital would get rid of all the adjustment pots, of course. > > Any thoughts? > > Jon > ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
