I think it will take a custom sine drive. I think microchip's bldc demo board would possibly drive that motor. A few ideas -
#1 Use more hall sensors and a sine lookup table. #2 Use hall sensors + angle sensing by current pulsing/reading. #3 Sync the halls with the encoder some way. (not a good option in my books) On Sat, Apr 14, 2012 at 12:57 AM, gene heskett <ghesk...@wdtv.com> wrote: > On Saturday, April 14, 2012 12:44:59 AM Gabriel Willen did opine: > > > Finally some educated answers, this mailing list is really coming > > through! I have a 660W 48v 15A Bldc motor, using this drive > > http://www.sei-automation.com/products/Brushless/BLDC-5015A.html laying > > around. I started thinking about trying to set it up as a servo, see > > how it would do, Get a 1000cpr encoder with A, A-, B, B-, Z, also With > > 8 pole hall sensor outs. I started tuning it with LinuxCNC Pid > > control. I just had it mounted on the table With no Load attached. Let > > me just say the cogging Is very noticeable and almost impossible to > > tune out. i wonder if it was under a load, it wouldn't be so > > noticeable? > > The added inertia of having a load would probably help. But looking at the > specs, it says 8000 rpm max, with a 75/1 range, which is another way of > saying its minimum speed is going to be about 107 rpm. I wouldn't be too > surprised to find that it would be a quite nervous motor when asked to turn > any slower than that for precise positioning, one 'step' might be more than > a 1000 count encoders deadband. > > However I do not have any such motors, so I am 'reading between the lines' > a bit. Your experiments of course will answer the question better that I > can. > > > ------------------------------------------------------------------------ > > ------ For Developers, A Lot Can Happen In A Second. > > Boundary is the first to Know...and Tell You. > > Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! > > http://p.sf.net/sfu/Boundary-d2dvs2 > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > Cheers, Gene > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > My web page: <http://coyoteden.dyndns-free.com:85/gene> > When one knows women one pities men, but when one studies men, > one excuses women. > -- Horne Tooke > > > ------------------------------------------------------------------------------ > For Developers, A Lot Can Happen In A Second. > Boundary is the first to Know...and Tell You. > Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! > http://p.sf.net/sfu/Boundary-d2dvs2 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
