Em 22/2/2011 07:30, Andrew Wood escreveu:
> Presumably the governor is on the prime mover rather than the alternator?


Exactly. Diesel engines have a fuel injection pump with a governor.
Engines made for electricity generators that need to be lock-stepped to
work together have electronic governors, whilst normal tractor engines
have mechanical governors. Most diesel generators I have seen use normal
tractor engines.


> What phenomenon is responsible for it becoming harder to turn?


It is the same principle  that makes electric motors work, interaction
between magnetic fields in the rotor and stator.

It's not hard to understand that it must be that way, or else we would
be again in the realm of free-energy harvesting.


Isaac

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