Sorry, I forgot to change the subject when I sent this before so most guys just passed
it by. FWIW.

>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