"Jay Honeck" writes:

Yeah, for some reason electric DGs are outrageously more expensive than
vacuum ones.

Anyone know why?

They ARE direct drive, are they not?

My guess is as follows. The air/vacuum motor is trivial; a series
of vanes and a jet tube from the intake filter. Easy to make go
fast.

But a tiny DC motor is difficult; the rotor windings will want to
fling themselves out at high speeds. The brushes and commutator
will be near watchmaker-skill level.

A new design would have a AC inductor motor with a squirrel-cage
motor, and a small internal inverter. But does anyone make them
like that?


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