On Mon, 2011-01-24 at 22:44 +1100, Erik Christiansen wrote: > On Sun, Jan 23, 2011 at 08:00:22AM -0500, gene heskett wrote: > > > > > I don't think this is the link you intended? This is to a pdf brochure > > describing only the encoder. > > Whoops! Here's the recycled alternator BLDC example that I had in mind: > http://www.youtube.com/watch?v=Tu-ia7GylO0 > > There are others there. > > I don't know how well the motor performs, but it is a quicker way to > start experimenting than ordering rotor laminations and copper wire. > > Erik
My understanding is that these are _very_ inefficient as motors, let alone as alternators. Common stator laminations are fairly thick, the rotors don't have any laminations, so there are significant eddy losses. There is a reason these come fitted with a fan, which is another loss itself. I have thought a new permanent magnet or laminated rotor might be worth a try. But one would need to measure temperature and efficiency with realistic loads to see if they would be practical. I agree that much can be learned by experimenting with an automotive alternator, but it's best if one can be had for free or very low cost. -- 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
