>Richard Sohn wrote:

>We should not overlook the disadvantage of PM alternators. At higher operating speed, the not used >output will have to be dissipated. This is the main reason why automotive alternators are regulated by >the excitation system.

Another disadvantage of PM devices is the hystersis losses in the stator laminations. At 6000 rpm
continuous you could end up with a very warm stator. Actually, the ultimate answer to all this will probably
be a switched reluctance integrated starter/alternator. Used with an EWP - no belts at all.

Fred Osborn