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electromagnet OPENING a door

Discussion in 'Electronic Basics' started by Sammy Taylor, Dec 1, 2005.

  1. Sammy Taylor

    Sammy Taylor Guest

    Hi,

    I'm building a small safe with an electronic strike (i.e., latch). When a
    timer activates,
    the strike releases. I want the door to pop open, and using a spring is
    awkward. I thought a simple electromagnet might work. Can somebody suggest a
    geometry.

    Cheap strong electromagnets seem to be of the U-shaped variety. Can I use
    one
    of these and a permanent magnet to repel each other? (I can't use two
    permanent magnets because the pre-load on the strike can be enough to
    prevent it from opening.)

    Thanks for any help.

    sammy
     
  2. Rich Grise

    Rich Grise Guest

    I can't imagine why not, as long as you can figure out how to trigger it
    and everything. Unless you hit it with enough force to make the lid a
    lethal weapon, it shouldn't hurt the permanent magnet, as long as it's
    really "permanent". :)

    Cheers!
    Rich
     
  3. Jasen Betts

    Jasen Betts Guest

    yes if you can get a magnet with the correct configuration and of the
    correct strength, too weak and the electromagnet will attract it, too strong
    and it will stick to the electromagnet

    (I can't use two
    here's some other ideas. use the the electromagnet to hold the door shut
    while you trigger the strike, and then release it and let the spring open
    the door.

    use a push-type solenoid to nudge the door open when you trigger the
    strike

    replace the strike with one with a stronger solenoid, or replace the
    solenoid etc...

    Use a central locking actuator to operate the latch or to nudge the door.

    hmm, thinking automotive, don't some vehicles have electricly opened fuel
    flaps?

    Bye.
    Jasen
     
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