electromagnet OPENING a door

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


.

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