On Sat, 2011-01-22 at 12:36 -0600, Jon Elson wrote: > Kirk Wallace wrote: > > On Sat, 2011-01-22 at 22:34 +1100, Erik Christiansen wrote: > > ... snip > > > >> Now an important question. Where is it planned to source the BLDC > >> motors? :-) > >> > Well, Keling has brushless motors for $47 (NEMA 17) and $56 (Nema 23) > that are > quite impressive. They have Hall sensors but no encoder, although a > rear shaft > is all set up to take US Digital or CUI encoders. > > Kirk had a line on some Wantai motors from IMTTUSA that were really sold > for pump duty and such, and > it is harder to apply an encoder to these. But, you could now take the > Hall sensor arrangement > off the rear shaft and use the new CUI 6-channel encoder to get both > Hall and quadrature signals. > > > Jon
Yes. If your primary concern is to just get motors, the above store-bought motors would be the way to go, but it would be fun to try making a DIY motor. Also the NEMA 34's are in the $100-200 each range, and these, to me at least, are much more useful. BTW, pictures of my Wantai (IMTTUSA) are here: http://www.wallacecompany.com/machine_shop/Wantai/ This is the smallest of the 34's. Taking the DIY idea a little further, wouldn't it be nice to have an in-country manufacturer? A local source of magnets is a problem for my country, though. http://www.scientificamerican.com/article.cfm?id=rare-earths-elemental-needs-of-the-clean-energy-economy Short URL: http://alturl.com/knizh Another thing I have been mulling over, I wonder if an AEAT-1060 could be used on a BLDC? http://www.avagotech.com/docs/AV02-0188EN The datasheet indicates: "There is no upper speed limit; the only restriction is that there will be fewer samples per revolution as the speed increases." and "Maximum Read-out Frequency ≤1 MHz >0 MHz " Avago has some six channel encoders that look interesting too: http://www.avagotech.com/docs/AV02-2387EN http://www.avagotech.com/docs/AV02-0075EN Oops, I need to get back to work. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ 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
