On Nov 28, 2007, at 7:42 AM, Marc van Doornik wrote: > Right. It seems I have got it, now. Feel a bit Kelly Bundy-ish right > now, but I've finally realized my mistake. All the while, I've been > treating the linear motors as if they were stepping motors with a > large > pole period (2.4", by the way). This also explains all that hysteresis > stuff and the spungy/springy behavior and so on, which - indeed - is > nonexistent if these motors are driven in the **correct** way. So, > from > what I've gathered, this is what I should do now: > > 1. Get forcer aligned to the stator field (using hall sensors) > 2. Offset motor phases by 90 degrees and lock them to the forcer > position > 3. Have the velocity PID control the current through the windings to > generate the desired force, while keeping the phase locked to the > forcer > position > > Fortunately, the amps have controlled current output, so that a given > input voltage always corresponds to a given winding current. This > should > make things a lot easier, right? (Jon?) > > Now, did whoever discovered caffeine receive a Nobel prize? ;-)
The use of caffeine containing plants goes back to the Stone Age. Chinese legend attributes brewed tea to a ruler in about 3000 BC Nobel prize ... discovery no ... but for synthesis yes ... Hermann Emil Fisher 1902 Dave > > Marc. > > ---------------------------------------------------------------------- > --- > SF.Net email is sponsored by: The Future of Linux Business White Paper > from Novell. From the desktop to the data center, Linux is going > mainstream. Let it simplify your IT future. > http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------- SF.Net email is sponsored by: The Future of Linux Business White Paper from Novell. From the desktop to the data center, Linux is going mainstream. Let it simplify your IT future. http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
