Rob - On Mon, Mar 29, 2010 at 11:14:51AM -0400, Rob Butts wrote: > I've read about the eddy current breaks but it's still not clear to me > how to construct one. The wikipedia talks about a rotor connected to a > spinnning coil. I would think the rotor would spin inside a coil.
Any time you have a conductor (aluminum is a good choice) moving in a magnetic field (a permanent magnet is fine) it will have a repulsive force (not always easy to detect) and a drag (actually decreases at high speeds, as the repulsive forces kick in). It's easy to try out yourself with a spinning aluminum disk and a strong permanent magnet. This is also how an old-fashioned mechanical speedometer works. - Larry _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
