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Hmm, I can see how electromagnets or cryogenics (for superconductors) would be a loss, but I don't see why "permanent magnets" per se would be too expensive.

Most economists teach a theoretical framework that has been shown to be fundamentally useless. -- James K. Galbraith
by Migeru (migeru at eurotrib dot com) on Fri Jan 9th, 2009 at 04:11:52 AM EST
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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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