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Reverese polarity of electromagnet

Discussion in 'Electronic Basics' started by smpaladin, Sep 12, 2004.

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  1. smpaladin

    smpaladin Guest

    I have a simple battery/electromagnet setup. Does anyone know how I
    could set up a switch to reverse the polarity of the electromagnet?
    (Besides switching the wires on the battery)
  2. Jeroen

    Jeroen Guest

    A simple DPDT switch will do the trick: (view with a fixed font)

    + --+--o
    | \----o magnet +
    | -o
    | |
    \----o magnet -
    - ----+o

    If you take a switch with 3 positions the middle position will turn the
    magnet off
  3. Tim Auton

    Tim Auton Guest


    If it's not centre-off, make sure it's a break-before-make switch!

  4. Sorry, but your schematics do not work.
    I think this one will be better...

    + --+---o
    | \----o magnet +
    | +-o
    | |
    - ----+-o
    | \----o magnet -

    Never forget the make a design review ;-)
  5. smpaladin

    smpaladin Guest

    Now is there any kind of switch that will reverse the polarity of the
    coil electrically like in this picture?

    Once a current is applied to the red switch, it reverses the polarity
    of the coil as long as the current is applied. If this sounds
    ridiculous, don't blame me since I may have no idea what I'm talking

  6. The "red switch" would be a double pole, double throw relay, with its
    contacts wired as shown above (but you'd probably also want another
    switch to turn the coil off...)

    Peter Bennett, VE7CEI
    peterbb4 (at)
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  7. John Fields

    John Fields Guest

    This is seb; don't worry about it.

    Here's one way to do it:

    BAT+>--------+---------------------------+--O--> | S1
    | | |
    BAT->----+-----------------+ | O
    | | NC K1A NO | NC K1B NO| |
    | O-->\ <--O-+-O-->\ <--O |
    | \- - - - - - - -\- - - - - -[COIL]
    | O COM O COM |
    | | | |
    | | +-----+ |
    | | | |
    | | [MAGNET] |
    | | | |
    | +---------------------+ |

    With S1 open, the polarity of the magnet will be oriented onE way, and
    with S1 closed the polarity will reverse.
  8. smpaladin

    smpaladin Guest

    Could you refer me to more specific information about a double pole,
    double throw relay? Thanks.
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