Message text written by "STOUT, GARRY V, CSFF2"
>Can anyone on the Europa net tell me if the Rotax 914 uses a Generator, or
an Alternator.
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It uses a permanent magnet generator which is similar to an alternator with
no field connection.
Advantages
Weight & Space Saving - the flywheel is also the rotor (permanent magnet)
for the generator and apart from the regulator it is all enclosed in the
engine casing.
Little maintenance - no brushes/slip rings and no belt drive. The only
moving part is the flywheel.
Disadvantages
Limited output - if you need more than 20A then an add-on alternator is
required (not normally an issue for day VFR)
More difficult to regulate - as there is no field (feedback) connection all
the regulation involves taming an uncontrolled output needing a more
sophisticated regulator.
This type of generator has been used on motorbikes for many years so it is
not a new technology.
Nigel Charles
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