Jon Elson wrote: > Peter C. Wallace wrote: >> If you are just driving a bare motor, try raising your sampling rate... > Geez, the resonance seems to be about 40 Hz, my sampling rate is > already 1 KHz, 25 X higher. But, yes, I can go to at least 5 > KHz and see what happens. > > Jon >
Do you have current feedback or a current loop? (I doubt it.) If you control current, you more-or-less eliminate one pole from the system response. If you only control voltage, the system response is more complex. Its pretty similar to the difference between current-mode and voltage-mode control of switching power supplies. (see http://encon.fke.utm.my/nikd/latest/OctCurrentMode.pdf) Regards, John Kasunich ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
