If we plan on making a toothed wheel with inductive pickup part of
the design then the flywheel style alternator will need to go onto the
opposite end of the shaft. The magnetic field of the alternator will
interfere with the timing pickup. It looks like Renesis has the
toothed wheel behind the pulley.
     The DIY wind power generators I have seen are very close and are
called "axial flux"
     The coils are turned were they look like a bunch of 'O's making
petals to a flower.

     The places for the axial flux alternator:
        Prop flange
             prop rpm
             part of the split PSU and still in design phase
             moment is large
        between the planet cage and fly wheel
             engine rpm
             part of the split PSU and still in design phase
             moment is large - ~16"
        Pulley side
             Move toothed wheel to flywheel - minimal moment change
             Could be part of an accessory case design
             moment

-- 
Blake C. Lewis


What do you do about the eddy currents in the aluminum?  There is heat
and resistance to power in this housing.  I ask because I have designed
motors with aluminum housings.  A proff of this power is to place a
plate of aluminum on a series of "toothpicks" for bearings or "wheels".
Rapidly pass a neodymium magnet over it and the aluminum will move.  In
a motor or generator that energy develops heat and drag.  Does this
design address that?

Rick Irwin

Rick,
   I haven't designed electric motors before. I am assuming that you
are referring to the moving magnets as opposed to a moving stator.
   A prop flange design would be a way to minimize this problem, being
that location has the least amount of stationary metal.
   I think that the RevMaster and the Harley radial designs both have
aluminum housings.
   How significant do you think that the heat and drag is in the
efficiency of the alternator over a conventional automotive design? Do
you think that the loss is more or less than that due to belt loading
and friction?

-- 
Blake C. Lewis

The magnetic flux will be contained in the iron cores of the coils.
Eddy currents in the non-ferrous frame will not be an issue.  With this
type alternator there may be some efficiency issues with the voltage
regulator, however.  These alternators are usually paired with a shunt
type regulator.  With this type regulator the alternator is producing
near full output all the time.  With a 30 amp alternator that would be
about 360 watts (about 1/2  horsepower net).  There may also be
mechanical losses because we will probably need to incorporate a fan in
the structure somewhere to cool the coils and the voltage regulator will
need to be located in a cool air stream.  The Compu-Fire system that was
mentioned last week is unique because the Compu-Fire regulator is a
series-pass type which would save a little energy when the aircraft
electrical load was low.

Aubrey



The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2005 All world wide rights reserved.