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permanent magnet alternator for turbine

Discussion in 'Electronic Design' started by matthew, Sep 4, 2003.

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  1. matthew

    matthew Guest

    i have a rough understand behind how to build a permanent magnet
    alternator however i still have a few questions.

    1. from the home build PM alternators i've read about on the internet
    most people put laminates or iron filings (in resin) behind the
    coils; is this to strengthen the magnetic field? if so would
    laminates or iron filings behind the magnets themselves also
    strengthen the magnetic field? i've read the reason laminates are
    used instead of a solid piece of steel is because eddy currents occur,
    is this ture?

    2. i know the magnets need to alternate North/South, but do the coils
    need to be oppositely wrapped or are they all wrapped in the same
    direction

    3. is there a particular shape or size relative to the magnets that
    the coils should be?

    4. finally, about the highest output i've seen from a homemade PM
    alternator is around 1 Kw, and this being a fairly large machine.
    however looking at industrial produced PM alternators i can find must
    smaller alternators with much higher outputs. what i'm wondering is
    where is the difference? is it in the way the coils are wound, or the
    magnets, or just being highly refined?

    thanks for any advise
    matthew
     
  2. Steve

    Steve Guest

    Yes, by reducing the RELUCTANCE of the magnetic circuit.
    Yes.

    Have you seen this site ?
    http://homepages.enterprise.net/hugh0piggott/

    Lots of stuff on axial flux alternators.

    Axial flux machines are much less efficient that radial flux machines,
    but much easier to build.

    Steve
     
  3. Yes. The iron helps gather the magnetic field. Breaking up the iron
    core is to prevent the electricity from spinning though the iron the
    same way you want it to spin though the wires.

    It depends on how you build the motor. There is more than one way to do
    it. Simple home-made generators will match each magnet to one coil.
    Commercial generators avoid that because it causes vibration.

    Industrial generators have a field coil winding that is much stronger
    and heat resistant than a permanent magnet. Of course, refinement of
    design helps a lot too. A car alternator is an example of a tiny
    generator with 500W to 1000W output. Pick one up at a junkyard to see
    how one works.
     
  4. N. Thornton

    N. Thornton Guest

    Hi. The only sensible advice is dont. Home made gens are inferior in
    every respect, including efficiency, reliability, robustness, noise,
    and time.


    Regards, NT
     
  5. Al

    Al Guest

    Buy it already built and never learn anything.

    Al
     
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