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A Coil With Taps For Phases ??

Discussion in 'Electronic Basics' started by Randy Gross, Aug 28, 2005.

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  1. Randy Gross

    Randy Gross Guest

    In response to my post about an anti-cogging core:

  2. Fred Abse

    Fred Abse Guest

  3. Randy Gross

    Randy Gross Guest

    Fred Abse wrote:

    I can see why the design is obsolete and, I agree on the efficiency.
    The alternator will produce less than the potential output.

  4. There is one detail that I missed up to this point, when the stator is
    an iron ring wound like a toroidal inductor. I think, that at each
    node where you take off a connection, the coil has to change direction
    of wind. Think about it and see if you can figure out why.

    By the way, I intend to make a generator like this as a demo for a
    high school science class. I like it, because it can be made very
    skeletal so that all parts are visible. If I am wrong about the
    winding direction, I will have to cut the ends and reverse wire them.
    But I think I am right about this.

    Got some nice curved neodymium magnets to energize the rotor coming
    from Ebay.
  5. Randy Gross

    Randy Gross Guest

    Up to the point you mentioned this, I gave it no thought but you are
    right, it won't alternate unless the windings are reversed.
    I haven't seen anything more visible as a teaching aide. If you put
    this unit together like I think you will, you will have a striking
    conversation piece to display in your office or study for years to come.

  6. Jasen Betts

    Jasen Betts Guest

  7. Jasen Betts

    Jasen Betts Guest

    I can't figure out why.

    If the toroid is would such that a clockwise motion of the north pole of the
    magnet produces a clockwise flow of current (or clockwise EMF) in the
    windings , the clockwise movement of the south pole will cause a
    counter-clockwise current direclty opposite it, leading to positive peak at
    the "east pole" of the magnet and a negative peak at the "west pole"
    try making a three phase one :)

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