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Model Maglev Train containg Hall Sensors on the train... Best Method?

Discussion in 'Electronic Design' started by David Garza, Feb 25, 2005.

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  1. David Garza

    David Garza Guest


    I am very new to this, and am pressed for time. A friend and I are
    looking to build a model maglev train that will be able to hover
    independently from any sides or rubbing against anything visible.
    1. We would use a hall sensor to judge the distance from the car to the
    track; this will be used to maintain a horizontal balance so it will
    not touch the sides. The Hall sensors would be mounted on the train.
    2. We would use static magnets (ferrite bar magnets) to maintain a
    constant height. However, I have read this may interrupt the horizontal
    balance provided by the Hall sensors.

    Now, another idea which I am leaning towards is:

    A 'v' shaped track, as such:

    \ /\1 1/\ /
    \/ / \ \/
    \/ \/
    \ /
    \ /

    This would allow us to remove the static ferrite bar magnets on the
    bottom. But that means the Hall sensors would have to be mounted on the
    track, where electromagnets would be mounted, because the track will be
    maintaining vertical and horizontal stability.

    The Hall sensors would replace where the #1's are and the
    electromagnets would be right beneath the Hall sensor that is
    controlling it.

    Here are my questions:

    1) What type of and how should the magnets be setup on the cart itself?
    2) How many Hall sensors would we need and how far apart should they be
    3) What should we do concerning propulsion, as we want to regulate the
    speed ourselves (if possible)?
    4) I read that the feedback loop of the Hall sensors would eventually
    move the cart so much that it would eventually come off of the track;
    what can we do to prevent this?

    Thank You all for your help!

    Thanks and God Bless!

    David Garza
  2. Hah! Good Luck!

  3. Why not use the same scheme that full sized Maglevs use?

    I belive that their levitation and track centering schemes are based on
    magnetic repulsion. This provides its own negative feedback with no
    control electronics. If
    the car moves too far in one direction, the repulsion on that side
    increases and provides a force that moves the car in the opposite

    Some systems use permanent magnets in both car and track, which provide
    levitation at all times. Others use magnets in the car and conducting
    loops in the track in a form of linear induction motor. These ill only
    levitate when the car is moving, so the car will need wheels on which to
    'land' when the car stops.
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