On Sunday, January 23, 2011 07:58:18 am Erik Christiansen did opine: > On Sat, Jan 22, 2011 at 08:41:19AM -0800, Kirk Wallace wrote: > > I have been thinking about this too. There is a fair amount of > > activity with DIY out-runner motors in the model airplane community. > > Occasionally, they can get enough orders together to have a batch of > > custom silicon steel laminations made. The bell, magnets, bearings, > > hub and stator windings are easy enough for an individual to make. > > A while ago, Model Engineering Workshop had an article on making > outrunner BLDC motors. These were based on the rotor from something like > a discarded drill. The windings were hacksawed at the ends, and peeled > out. The commutator is also not needed, obviously. New windings on what > is now the stator, and monster magnets inside the outrunner, plus new > bearings, and you're off, at 10 to 20,000 RPM. The author just used > model aircraft BLDC controllers, though. > > There is no chance that I'd finish the project if I added motor building > to the end of the row to hoe. (Too much else already started, and not > yet finished. ;-) > > > There is at least one person on this list that has an out-runner on > > their mill spindle. Typically these motors don't have rotor sensors, > > so adding Hall sensors will most likely be needed if one wants to > > start the motor with a load. > > These can presumably be optical instead, if that's what's in the > junkbox, and this 120�/step encoder is enclosed, to keep it clean. > > > I would really like to try to make an out-runner that caters to an > > axis application. > > In MEW, it was used as a high speed spindle. But being able to use the > lathe spindle as a rotary axis would be very nice, with a milling head > on the cross-slide. But that would take a hefty motor. (My mill-drill > isn't worth converting, and too useful as a manual.) > > Oh, now I remember. Some years ago I toyed with the idea of using a > truck alternator as a BLDC motor. They seem to be common now, and this > one is chewing about 130W, just flailing air: > http://www.avagotech.com/docs/AV02-0188EN > I don't think this is the link you intended? This is to a pdf brochure describing only the encoder.
> If mesa or pico have a controller which will drive e.g. a 24v 50A truck > alternator as a BLDC, I think I'd take the easy way out, and just add > some "hall" sensors. > > Erik > > ------------------------------------------------------------------------ > ------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD > value)! Finally, a world-class log management solution at an even > better price-free! Download using promo code Free_Logger_4_Dev2Dev. > Offer expires > February 28th, so secure your free ArcSight Logger TODAY! > http://p.sf.net/sfu/arcsight-sfd2d > _______________________________________________ > 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 weight is perfect for my height -- which varies. ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
