On 10 June 2013 00:20, Gene Heskett <[email protected]> wrote: > And this is with Pgain > at about 40, but there is a speed instability, an almost random 50 rpm > wandering that doesn't go away if I turn off the pwm dither,
Any PID tuning for a nonlinear system is likely to be a compromise. The lincurve module is actually modelled on the type of structure we use at work to control nonlinear systems. Typically the P, I and D terms are the output of such a lookup table. (Which is why, rather unusually, that module has IO pins as well as outputs). So, rather than setting up a 12-entry linearisation curve, you could try a 3-entry curve to provide the P-term for your system. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ How ServiceNow helps IT people transform IT departments: 1. A cloud service to automate IT design, transition and operations 2. Dashboards that offer high-level views of enterprise services 3. A single system of record for all IT processes http://p.sf.net/sfu/servicenow-d2d-j _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
