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As opposed to a simple bearing?  rare earth PMs can become quite expensive, especially at small scale.  otoh, permanent magnets have been used in the generators of gearless or hybrid turbines for years now, and are quite efficient.

"Life shrinks or expands in proportion to one's courage." - Ana´s Nin
by Crazy Horse on Fri Jan 9th, 2009 at 04:23:26 AM EST
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