2012/12/22 andy pugh <[email protected]>: > On 22 December 2012 09:10, Viesturs Lācis <[email protected]> wrote: > >> The thing is that yesterday I spent 5 hours to realign hall sensors >> for that motor (that involved also physical changes to the pcb of that >> sensor to extend its "range of movement"). The result was that by the >> evening this motor, when installed in machine, had symmetrical pid >> output, as I jogged it back and forth. > > I think you ought to be able to adjust the bldc component to offset > the commutation. (bldc.encoder-offset) > However that is no help if the hall transitions are just inconsistent. > Have you tried qhi? That should avoid any inconsistency due to Hall > transitions, at the (minor) expense of running trapezoidally for up to > a full rev.
No, I have not tried qhi, I had qh all the time. The reason for not using qhi is this sentence in bldc manual page: "This gives a more accurate homing position if the distance in encoder counts between motor zero and encoder index is known." I do not know that distance and actually I have no idea, how to find that out. > In your situation, with a machine to get finished, I might be tempted > to run trapezoidal permanently anyway. How can I do that? -- Viesturs If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
